/* Ada language support routines for GDB, the GNU debugger. Copyright (C) 1992-2019 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include "defs.h" #include #include "gdb_regex.h" #include "frame.h" #include "symtab.h" #include "gdbtypes.h" #include "gdbcmd.h" #include "expression.h" #include "parser-defs.h" #include "language.h" #include "varobj.h" #include "inferior.h" #include "symfile.h" #include "objfiles.h" #include "breakpoint.h" #include "gdbcore.h" #include "hashtab.h" #include "gdb_obstack.h" #include "ada-lang.h" #include "completer.h" #include "ui-out.h" #include "block.h" #include "infcall.h" #include "annotate.h" #include "valprint.h" #include "source.h" #include "observable.h" #include "stack.h" #include "typeprint.h" #include "namespace.h" #include "cli/cli-style.h" #include "value.h" #include "mi/mi-common.h" #include "arch-utils.h" #include "cli/cli-utils.h" #include "gdbsupport/function-view.h" #include "gdbsupport/byte-vector.h" #include /* Define whether or not the C operator '/' truncates towards zero for differently signed operands (truncation direction is undefined in C). Copied from valarith.c. */ #ifndef TRUNCATION_TOWARDS_ZERO #define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2) #endif static struct type *desc_base_type (struct type *); static struct type *desc_bounds_type (struct type *); static struct value *desc_bounds (struct value *); static int fat_pntr_bounds_bitpos (struct type *); static int fat_pntr_bounds_bitsize (struct type *); static struct type *desc_data_target_type (struct type *); static struct value *desc_data (struct value *); static int fat_pntr_data_bitpos (struct type *); static int fat_pntr_data_bitsize (struct type *); static struct value *desc_one_bound (struct value *, int, int); static int desc_bound_bitpos (struct type *, int, int); static int desc_bound_bitsize (struct type *, int, int); static struct type *desc_index_type (struct type *, int); static int desc_arity (struct type *); static int ada_type_match (struct type *, struct type *, int); static int ada_args_match (struct symbol *, struct value **, int); static struct value *make_array_descriptor (struct type *, struct value *); static void ada_add_block_symbols (struct obstack *, const struct block *, const lookup_name_info &lookup_name, domain_enum, struct objfile *); static void ada_add_all_symbols (struct obstack *, const struct block *, const lookup_name_info &lookup_name, domain_enum, int, int *); static int is_nonfunction (struct block_symbol *, int); static void add_defn_to_vec (struct obstack *, struct symbol *, const struct block *); static int num_defns_collected (struct obstack *); static struct block_symbol *defns_collected (struct obstack *, int); static struct value *resolve_subexp (expression_up *, int *, int, struct type *, int, innermost_block_tracker *); static void replace_operator_with_call (expression_up *, int, int, int, struct symbol *, const struct block *); static int possible_user_operator_p (enum exp_opcode, struct value **); static const char *ada_op_name (enum exp_opcode); static const char *ada_decoded_op_name (enum exp_opcode); static int numeric_type_p (struct type *); static int integer_type_p (struct type *); static int scalar_type_p (struct type *); static int discrete_type_p (struct type *); static struct type *ada_lookup_struct_elt_type (struct type *, const char *, int, int); static struct value *evaluate_subexp_type (struct expression *, int *); static struct type *ada_find_parallel_type_with_name (struct type *, const char *); static int is_dynamic_field (struct type *, int); static struct type *to_fixed_variant_branch_type (struct type *, const gdb_byte *, CORE_ADDR, struct value *); static struct type *to_fixed_array_type (struct type *, struct value *, int); static struct type *to_fixed_range_type (struct type *, struct value *); static struct type *to_static_fixed_type (struct type *); static struct type *static_unwrap_type (struct type *type); static struct value *unwrap_value (struct value *); static struct type *constrained_packed_array_type (struct type *, long *); static struct type *decode_constrained_packed_array_type (struct type *); static long decode_packed_array_bitsize (struct type *); static struct value *decode_constrained_packed_array (struct value *); static int ada_is_packed_array_type (struct type *); static int ada_is_unconstrained_packed_array_type (struct type *); static struct value *value_subscript_packed (struct value *, int, struct value **); static struct value *coerce_unspec_val_to_type (struct value *, struct type *); static int lesseq_defined_than (struct symbol *, struct symbol *); static int equiv_types (struct type *, struct type *); static int is_name_suffix (const char *); static int advance_wild_match (const char **, const char *, int); static bool wild_match (const char *name, const char *patn); static struct value *ada_coerce_ref (struct value *); static LONGEST pos_atr (struct value *); static struct value *value_pos_atr (struct type *, struct value *); static struct value *value_val_atr (struct type *, struct value *); static struct symbol *standard_lookup (const char *, const struct block *, domain_enum); static struct value *ada_search_struct_field (const char *, struct value *, int, struct type *); static struct value *ada_value_primitive_field (struct value *, int, int, struct type *); static int find_struct_field (const char *, struct type *, int, struct type **, int *, int *, int *, int *); static int ada_resolve_function (struct block_symbol *, int, struct value **, int, const char *, struct type *, int); static int ada_is_direct_array_type (struct type *); static void ada_language_arch_info (struct gdbarch *, struct language_arch_info *); static struct value *ada_index_struct_field (int, struct value *, int, struct type *); static struct value *assign_aggregate (struct value *, struct value *, struct expression *, int *, enum noside); static void aggregate_assign_from_choices (struct value *, struct value *, struct expression *, int *, LONGEST *, int *, int, LONGEST, LONGEST); static void aggregate_assign_positional (struct value *, struct value *, struct expression *, int *, LONGEST *, int *, int, LONGEST, LONGEST); static void aggregate_assign_others (struct value *, struct value *, struct expression *, int *, LONGEST *, int, LONGEST, LONGEST); static void add_component_interval (LONGEST, LONGEST, LONGEST *, int *, int); static struct value *ada_evaluate_subexp (struct type *, struct expression *, int *, enum noside); static void ada_forward_operator_length (struct expression *, int, int *, int *); static struct type *ada_find_any_type (const char *name); static symbol_name_matcher_ftype *ada_get_symbol_name_matcher (const lookup_name_info &lookup_name); /* The result of a symbol lookup to be stored in our symbol cache. */ struct cache_entry { /* The name used to perform the lookup. */ const char *name; /* The namespace used during the lookup. */ domain_enum domain; /* The symbol returned by the lookup, or NULL if no matching symbol was found. */ struct symbol *sym; /* The block where the symbol was found, or NULL if no matching symbol was found. */ const struct block *block; /* A pointer to the next entry with the same hash. */ struct cache_entry *next; }; /* The Ada symbol cache, used to store the result of Ada-mode symbol lookups in the course of executing the user's commands. The cache is implemented using a simple, fixed-sized hash. The size is fixed on the grounds that there are not likely to be all that many symbols looked up during any given session, regardless of the size of the symbol table. If we decide to go to a resizable table, let's just use the stuff from libiberty instead. */ #define HASH_SIZE 1009 struct ada_symbol_cache { /* An obstack used to store the entries in our cache. */ struct obstack cache_space; /* The root of the hash table used to implement our symbol cache. */ struct cache_entry *root[HASH_SIZE]; }; static void ada_free_symbol_cache (struct ada_symbol_cache *sym_cache); /* Maximum-sized dynamic type. */ static unsigned int varsize_limit; static const char ada_completer_word_break_characters[] = #ifdef VMS " \t\n!@#%^&*()+=|~`}{[]\";:?/,-"; #else " \t\n!@#$%^&*()+=|~`}{[]\";:?/,-"; #endif /* The name of the symbol to use to get the name of the main subprogram. */ static const char ADA_MAIN_PROGRAM_SYMBOL_NAME[] = "__gnat_ada_main_program_name"; /* Limit on the number of warnings to raise per expression evaluation. */ static int warning_limit = 2; /* Number of warning messages issued; reset to 0 by cleanups after expression evaluation. */ static int warnings_issued = 0; static const char *known_runtime_file_name_patterns[] = { ADA_KNOWN_RUNTIME_FILE_NAME_PATTERNS NULL }; static const char *known_auxiliary_function_name_patterns[] = { ADA_KNOWN_AUXILIARY_FUNCTION_NAME_PATTERNS NULL }; /* Maintenance-related settings for this module. */ static struct cmd_list_element *maint_set_ada_cmdlist; static struct cmd_list_element *maint_show_ada_cmdlist; /* Implement the "maintenance set ada" (prefix) command. */ static void maint_set_ada_cmd (const char *args, int from_tty) { help_list (maint_set_ada_cmdlist, "maintenance set ada ", all_commands, gdb_stdout); } /* Implement the "maintenance show ada" (prefix) command. */ static void maint_show_ada_cmd (const char *args, int from_tty) { cmd_show_list (maint_show_ada_cmdlist, from_tty, ""); } /* The "maintenance ada set/show ignore-descriptive-type" value. */ static bool ada_ignore_descriptive_types_p = false; /* Inferior-specific data. */ /* Per-inferior data for this module. */ struct ada_inferior_data { /* The ada__tags__type_specific_data type, which is used when decoding tagged types. With older versions of GNAT, this type was directly accessible through a component ("tsd") in the object tag. But this is no longer the case, so we cache it for each inferior. */ struct type *tsd_type = nullptr; /* The exception_support_info data. This data is used to determine how to implement support for Ada exception catchpoints in a given inferior. */ const struct exception_support_info *exception_info = nullptr; }; /* Our key to this module's inferior data. */ static const struct inferior_key ada_inferior_data; /* Return our inferior data for the given inferior (INF). This function always returns a valid pointer to an allocated ada_inferior_data structure. If INF's inferior data has not been previously set, this functions creates a new one with all fields set to zero, sets INF's inferior to it, and then returns a pointer to that newly allocated ada_inferior_data. */ static struct ada_inferior_data * get_ada_inferior_data (struct inferior *inf) { struct ada_inferior_data *data; data = ada_inferior_data.get (inf); if (data == NULL) data = ada_inferior_data.emplace (inf); return data; } /* Perform all necessary cleanups regarding our module's inferior data that is required after the inferior INF just exited. */ static void ada_inferior_exit (struct inferior *inf) { ada_inferior_data.clear (inf); } /* program-space-specific data. */ /* This module's per-program-space data. */ struct ada_pspace_data { ~ada_pspace_data () { if (sym_cache != NULL) ada_free_symbol_cache (sym_cache); } /* The Ada symbol cache. */ struct ada_symbol_cache *sym_cache = nullptr; }; /* Key to our per-program-space data. */ static const struct program_space_key ada_pspace_data_handle; /* Return this module's data for the given program space (PSPACE). If not is found, add a zero'ed one now. This function always returns a valid object. */ static struct ada_pspace_data * get_ada_pspace_data (struct program_space *pspace) { struct ada_pspace_data *data; data = ada_pspace_data_handle.get (pspace); if (data == NULL) data = ada_pspace_data_handle.emplace (pspace); return data; } /* Utilities */ /* If TYPE is a TYPE_CODE_TYPEDEF type, return the target type after all typedef layers have been peeled. Otherwise, return TYPE. Normally, we really expect a typedef type to only have 1 typedef layer. In other words, we really expect the target type of a typedef type to be a non-typedef type. This is particularly true for Ada units, because the language does not have a typedef vs not-typedef distinction. In that respect, the Ada compiler has been trying to eliminate as many typedef definitions in the debugging information, since they generally do not bring any extra information (we still use typedef under certain circumstances related mostly to the GNAT encoding). Unfortunately, we have seen situations where the debugging information generated by the compiler leads to such multiple typedef layers. For instance, consider the following example with stabs: .stabs "pck__float_array___XUP:Tt(0,46)=s16P_ARRAY:(0,47)=[...]"[...] .stabs "pck__float_array___XUP:t(0,36)=(0,46)",128,0,6,0 This is an error in the debugging information which causes type pck__float_array___XUP to be defined twice, and the second time, it is defined as a typedef of a typedef. This is on the fringe of legality as far as debugging information is concerned, and certainly unexpected. But it is easy to handle these situations correctly, so we can afford to be lenient in this case. */ static struct type * ada_typedef_target_type (struct type *type) { while (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) type = TYPE_TARGET_TYPE (type); return type; } /* Given DECODED_NAME a string holding a symbol name in its decoded form (ie using the Ada dotted notation), returns its unqualified name. */ static const char * ada_unqualified_name (const char *decoded_name) { const char *result; /* If the decoded name starts with '<', it means that the encoded name does not follow standard naming conventions, and thus that it is not your typical Ada symbol name. Trying to unqualify it is therefore pointless and possibly erroneous. */ if (decoded_name[0] == '<') return decoded_name; result = strrchr (decoded_name, '.'); if (result != NULL) result++; /* Skip the dot... */ else result = decoded_name; return result; } /* Return a string starting with '<', followed by STR, and '>'. */ static std::string add_angle_brackets (const char *str) { return string_printf ("<%s>", str); } static const char * ada_get_gdb_completer_word_break_characters (void) { return ada_completer_word_break_characters; } /* Print an array element index using the Ada syntax. */ static void ada_print_array_index (struct value *index_value, struct ui_file *stream, const struct value_print_options *options) { LA_VALUE_PRINT (index_value, stream, options); fprintf_filtered (stream, " => "); } /* la_watch_location_expression for Ada. */ static gdb::unique_xmalloc_ptr ada_watch_location_expression (struct type *type, CORE_ADDR addr) { type = check_typedef (TYPE_TARGET_TYPE (check_typedef (type))); std::string name = type_to_string (type); return gdb::unique_xmalloc_ptr (xstrprintf ("{%s} %s", name.c_str (), core_addr_to_string (addr))); } /* Assuming V points to an array of S objects, make sure that it contains at least M objects, updating V and S as necessary. */ #define GROW_VECT(v, s, m) \ if ((s) < (m)) (v) = (char *) grow_vect (v, &(s), m, sizeof *(v)); /* Assuming VECT points to an array of *SIZE objects of size ELEMENT_SIZE, grow it to contain at least MIN_SIZE objects, updating *SIZE as necessary and returning the (new) array. */ static void * grow_vect (void *vect, size_t *size, size_t min_size, int element_size) { if (*size < min_size) { *size *= 2; if (*size < min_size) *size = min_size; vect = xrealloc (vect, *size * element_size); } return vect; } /* True (non-zero) iff TARGET matches FIELD_NAME up to any trailing suffix of FIELD_NAME beginning "___". */ static int field_name_match (const char *field_name, const char *target) { int len = strlen (target); return (strncmp (field_name, target, len) == 0 && (field_name[len] == '\0' || (startswith (field_name + len, "___") && strcmp (field_name + strlen (field_name) - 6, "___XVN") != 0))); } /* Assuming TYPE is a TYPE_CODE_STRUCT or a TYPE_CODE_TYPDEF to a TYPE_CODE_STRUCT, find the field whose name matches FIELD_NAME, and return its index. This function also handles fields whose name have ___ suffixes because the compiler sometimes alters their name by adding such a suffix to represent fields with certain constraints. If the field could not be found, return a negative number if MAYBE_MISSING is set. Otherwise raise an error. */ int ada_get_field_index (const struct type *type, const char *field_name, int maybe_missing) { int fieldno; struct type *struct_type = check_typedef ((struct type *) type); for (fieldno = 0; fieldno < TYPE_NFIELDS (struct_type); fieldno++) if (field_name_match (TYPE_FIELD_NAME (struct_type, fieldno), field_name)) return fieldno; if (!maybe_missing) error (_("Unable to find field %s in struct %s. Aborting"), field_name, TYPE_NAME (struct_type)); return -1; } /* The length of the prefix of NAME prior to any "___" suffix. */ int ada_name_prefix_len (const char *name) { if (name == NULL) return 0; else { const char *p = strstr (name, "___"); if (p == NULL) return strlen (name); else return p - name; } } /* Return non-zero if SUFFIX is a suffix of STR. Return zero if STR is null. */ static int is_suffix (const char *str, const char *suffix) { int len1, len2; if (str == NULL) return 0; len1 = strlen (str); len2 = strlen (suffix); return (len1 >= len2 && strcmp (str + len1 - len2, suffix) == 0); } /* The contents of value VAL, treated as a value of type TYPE. The result is an lval in memory if VAL is. */ static struct value * coerce_unspec_val_to_type (struct value *val, struct type *type) { type = ada_check_typedef (type); if (value_type (val) == type) return val; else { struct value *result; /* Make sure that the object size is not unreasonable before trying to allocate some memory for it. */ ada_ensure_varsize_limit (type); if (value_lazy (val) || TYPE_LENGTH (type) > TYPE_LENGTH (value_type (val))) result = allocate_value_lazy (type); else { result = allocate_value (type); value_contents_copy_raw (result, 0, val, 0, TYPE_LENGTH (type)); } set_value_component_location (result, val); set_value_bitsize (result, value_bitsize (val)); set_value_bitpos (result, value_bitpos (val)); if (VALUE_LVAL (result) == lval_memory) set_value_address (result, value_address (val)); return result; } } static const gdb_byte * cond_offset_host (const gdb_byte *valaddr, long offset) { if (valaddr == NULL) return NULL; else return valaddr + offset; } static CORE_ADDR cond_offset_target (CORE_ADDR address, long offset) { if (address == 0) return 0; else return address + offset; } /* Issue a warning (as for the definition of warning in utils.c, but with exactly one argument rather than ...), unless the limit on the number of warnings has passed during the evaluation of the current expression. */ /* FIXME: cagney/2004-10-10: This function is mimicking the behavior provided by "complaint". */ static void lim_warning (const char *format, ...) ATTRIBUTE_PRINTF (1, 2); static void lim_warning (const char *format, ...) { va_list args; va_start (args, format); warnings_issued += 1; if (warnings_issued <= warning_limit) vwarning (format, args); va_end (args); } /* Issue an error if the size of an object of type T is unreasonable, i.e. if it would be a bad idea to allocate a value of this type in GDB. */ void ada_ensure_varsize_limit (const struct type *type) { if (TYPE_LENGTH (type) > varsize_limit) error (_("object size is larger than varsize-limit")); } /* Maximum value of a SIZE-byte signed integer type. */ static LONGEST max_of_size (int size) { LONGEST top_bit = (LONGEST) 1 << (size * 8 - 2); return top_bit | (top_bit - 1); } /* Minimum value of a SIZE-byte signed integer type. */ static LONGEST min_of_size (int size) { return -max_of_size (size) - 1; } /* Maximum value of a SIZE-byte unsigned integer type. */ static ULONGEST umax_of_size (int size) { ULONGEST top_bit = (ULONGEST) 1 << (size * 8 - 1); return top_bit | (top_bit - 1); } /* Maximum value of integral type T, as a signed quantity. */ static LONGEST max_of_type (struct type *t) { if (TYPE_UNSIGNED (t)) return (LONGEST) umax_of_size (TYPE_LENGTH (t)); else return max_of_size (TYPE_LENGTH (t)); } /* Minimum value of integral type T, as a signed quantity. */ static LONGEST min_of_type (struct type *t) { if (TYPE_UNSIGNED (t)) return 0; else return min_of_size (TYPE_LENGTH (t)); } /* The largest value in the domain of TYPE, a discrete type, as an integer. */ LONGEST ada_discrete_type_high_bound (struct type *type) { type = resolve_dynamic_type (type, NULL, 0); switch (TYPE_CODE (type)) { case TYPE_CODE_RANGE: return TYPE_HIGH_BOUND (type); case TYPE_CODE_ENUM: return TYPE_FIELD_ENUMVAL (type, TYPE_NFIELDS (type) - 1); case TYPE_CODE_BOOL: return 1; case TYPE_CODE_CHAR: case TYPE_CODE_INT: return max_of_type (type); default: error (_("Unexpected type in ada_discrete_type_high_bound.")); } } /* The smallest value in the domain of TYPE, a discrete type, as an integer. */ LONGEST ada_discrete_type_low_bound (struct type *type) { type = resolve_dynamic_type (type, NULL, 0); switch (TYPE_CODE (type)) { case TYPE_CODE_RANGE: return TYPE_LOW_BOUND (type); case TYPE_CODE_ENUM: return TYPE_FIELD_ENUMVAL (type, 0); case TYPE_CODE_BOOL: return 0; case TYPE_CODE_CHAR: case TYPE_CODE_INT: return min_of_type (type); default: error (_("Unexpected type in ada_discrete_type_low_bound.")); } } /* The identity on non-range types. For range types, the underlying non-range scalar type. */ static struct type * get_base_type (struct type *type) { while (type != NULL && TYPE_CODE (type) == TYPE_CODE_RANGE) { if (type == TYPE_TARGET_TYPE (type) || TYPE_TARGET_TYPE (type) == NULL) return type; type = TYPE_TARGET_TYPE (type); } return type; } /* Return a decoded version of the given VALUE. This means returning a value whose type is obtained by applying all the GNAT-specific encodings, making the resulting type a static but standard description of the initial type. */ struct value * ada_get_decoded_value (struct value *value) { struct type *type = ada_check_typedef (value_type (value)); if (ada_is_array_descriptor_type (type) || (ada_is_constrained_packed_array_type (type) && TYPE_CODE (type) != TYPE_CODE_PTR)) { if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) /* array access type. */ value = ada_coerce_to_simple_array_ptr (value); else value = ada_coerce_to_simple_array (value); } else value = ada_to_fixed_value (value); return value; } /* Same as ada_get_decoded_value, but with the given TYPE. Because there is no associated actual value for this type, the resulting type might be a best-effort approximation in the case of dynamic types. */ struct type * ada_get_decoded_type (struct type *type) { type = to_static_fixed_type (type); if (ada_is_constrained_packed_array_type (type)) type = ada_coerce_to_simple_array_type (type); return type; } /* Language Selection */ /* If the main program is in Ada, return language_ada, otherwise return LANG (the main program is in Ada iif the adainit symbol is found). */ static enum language ada_update_initial_language (enum language lang) { if (lookup_minimal_symbol ("adainit", NULL, NULL).minsym != NULL) return language_ada; return lang; } /* If the main procedure is written in Ada, then return its name. The result is good until the next call. Return NULL if the main procedure doesn't appear to be in Ada. */ char * ada_main_name (void) { struct bound_minimal_symbol msym; static gdb::unique_xmalloc_ptr main_program_name; /* For Ada, the name of the main procedure is stored in a specific string constant, generated by the binder. Look for that symbol, extract its address, and then read that string. If we didn't find that string, then most probably the main procedure is not written in Ada. */ msym = lookup_minimal_symbol (ADA_MAIN_PROGRAM_SYMBOL_NAME, NULL, NULL); if (msym.minsym != NULL) { CORE_ADDR main_program_name_addr; int err_code; main_program_name_addr = BMSYMBOL_VALUE_ADDRESS (msym); if (main_program_name_addr == 0) error (_("Invalid address for Ada main program name.")); target_read_string (main_program_name_addr, &main_program_name, 1024, &err_code); if (err_code != 0) return NULL; return main_program_name.get (); } /* The main procedure doesn't seem to be in Ada. */ return NULL; } /* Symbols */ /* Table of Ada operators and their GNAT-encoded names. Last entry is pair of NULLs. */ const struct ada_opname_map ada_opname_table[] = { {"Oadd", "\"+\"", BINOP_ADD}, {"Osubtract", "\"-\"", BINOP_SUB}, {"Omultiply", "\"*\"", BINOP_MUL}, {"Odivide", "\"/\"", BINOP_DIV}, {"Omod", "\"mod\"", BINOP_MOD}, {"Orem", "\"rem\"", BINOP_REM}, {"Oexpon", "\"**\"", BINOP_EXP}, {"Olt", "\"<\"", BINOP_LESS}, {"Ole", "\"<=\"", BINOP_LEQ}, {"Ogt", "\">\"", BINOP_GTR}, {"Oge", "\">=\"", BINOP_GEQ}, {"Oeq", "\"=\"", BINOP_EQUAL}, {"One", "\"/=\"", BINOP_NOTEQUAL}, {"Oand", "\"and\"", BINOP_BITWISE_AND}, {"Oor", "\"or\"", BINOP_BITWISE_IOR}, {"Oxor", "\"xor\"", BINOP_BITWISE_XOR}, {"Oconcat", "\"&\"", BINOP_CONCAT}, {"Oabs", "\"abs\"", UNOP_ABS}, {"Onot", "\"not\"", UNOP_LOGICAL_NOT}, {"Oadd", "\"+\"", UNOP_PLUS}, {"Osubtract", "\"-\"", UNOP_NEG}, {NULL, NULL} }; /* The "encoded" form of DECODED, according to GNAT conventions. The result is valid until the next call to ada_encode. If THROW_ERRORS, throw an error if invalid operator name is found. Otherwise, return NULL in that case. */ static char * ada_encode_1 (const char *decoded, bool throw_errors) { static char *encoding_buffer = NULL; static size_t encoding_buffer_size = 0; const char *p; int k; if (decoded == NULL) return NULL; GROW_VECT (encoding_buffer, encoding_buffer_size, 2 * strlen (decoded) + 10); k = 0; for (p = decoded; *p != '\0'; p += 1) { if (*p == '.') { encoding_buffer[k] = encoding_buffer[k + 1] = '_'; k += 2; } else if (*p == '"') { const struct ada_opname_map *mapping; for (mapping = ada_opname_table; mapping->encoded != NULL && !startswith (p, mapping->decoded); mapping += 1) ; if (mapping->encoded == NULL) { if (throw_errors) error (_("invalid Ada operator name: %s"), p); else return NULL; } strcpy (encoding_buffer + k, mapping->encoded); k += strlen (mapping->encoded); break; } else { encoding_buffer[k] = *p; k += 1; } } encoding_buffer[k] = '\0'; return encoding_buffer; } /* The "encoded" form of DECODED, according to GNAT conventions. The result is valid until the next call to ada_encode. */ char * ada_encode (const char *decoded) { return ada_encode_1 (decoded, true); } /* Return NAME folded to lower case, or, if surrounded by single quotes, unfolded, but with the quotes stripped away. Result good to next call. */ static char * ada_fold_name (const char *name) { static char *fold_buffer = NULL; static size_t fold_buffer_size = 0; int len = strlen (name); GROW_VECT (fold_buffer, fold_buffer_size, len + 1); if (name[0] == '\'') { strncpy (fold_buffer, name + 1, len - 2); fold_buffer[len - 2] = '\000'; } else { int i; for (i = 0; i <= len; i += 1) fold_buffer[i] = tolower (name[i]); } return fold_buffer; } /* Return nonzero if C is either a digit or a lowercase alphabet character. */ static int is_lower_alphanum (const char c) { return (isdigit (c) || (isalpha (c) && islower (c))); } /* ENCODED is the linkage name of a symbol and LEN contains its length. This function saves in LEN the length of that same symbol name but without either of these suffixes: . .{DIGIT}+ . ${DIGIT}+ . ___{DIGIT}+ . __{DIGIT}+. These are suffixes introduced by the compiler for entities such as nested subprogram for instance, in order to avoid name clashes. They do not serve any purpose for the debugger. */ static void ada_remove_trailing_digits (const char *encoded, int *len) { if (*len > 1 && isdigit (encoded[*len - 1])) { int i = *len - 2; while (i > 0 && isdigit (encoded[i])) i--; if (i >= 0 && encoded[i] == '.') *len = i; else if (i >= 0 && encoded[i] == '$') *len = i; else if (i >= 2 && startswith (encoded + i - 2, "___")) *len = i - 2; else if (i >= 1 && startswith (encoded + i - 1, "__")) *len = i - 1; } } /* Remove the suffix introduced by the compiler for protected object subprograms. */ static void ada_remove_po_subprogram_suffix (const char *encoded, int *len) { /* Remove trailing N. */ /* Protected entry subprograms are broken into two separate subprograms: The first one is unprotected, and has a 'N' suffix; the second is the protected version, and has the 'P' suffix. The second calls the first one after handling the protection. Since the P subprograms are internally generated, we leave these names undecoded, giving the user a clue that this entity is internal. */ if (*len > 1 && encoded[*len - 1] == 'N' && (isdigit (encoded[*len - 2]) || islower (encoded[*len - 2]))) *len = *len - 1; } /* If ENCODED follows the GNAT entity encoding conventions, then return the decoded form of ENCODED. Otherwise, return "<%s>" where "%s" is replaced by ENCODED. */ std::string ada_decode (const char *encoded) { int i, j; int len0; const char *p; int at_start_name; std::string decoded; /* With function descriptors on PPC64, the value of a symbol named ".FN", if it exists, is the entry point of the function "FN". */ if (encoded[0] == '.') encoded += 1; /* The name of the Ada main procedure starts with "_ada_". This prefix is not part of the decoded name, so skip this part if we see this prefix. */ if (startswith (encoded, "_ada_")) encoded += 5; /* If the name starts with '_', then it is not a properly encoded name, so do not attempt to decode it. Similarly, if the name starts with '<', the name should not be decoded. */ if (encoded[0] == '_' || encoded[0] == '<') goto Suppress; len0 = strlen (encoded); ada_remove_trailing_digits (encoded, &len0); ada_remove_po_subprogram_suffix (encoded, &len0); /* Remove the ___X.* suffix if present. Do not forget to verify that the suffix is located before the current "end" of ENCODED. We want to avoid re-matching parts of ENCODED that have previously been marked as discarded (by decrementing LEN0). */ p = strstr (encoded, "___"); if (p != NULL && p - encoded < len0 - 3) { if (p[3] == 'X') len0 = p - encoded; else goto Suppress; } /* Remove any trailing TKB suffix. It tells us that this symbol is for the body of a task, but that information does not actually appear in the decoded name. */ if (len0 > 3 && startswith (encoded + len0 - 3, "TKB")) len0 -= 3; /* Remove any trailing TB suffix. The TB suffix is slightly different from the TKB suffix because it is used for non-anonymous task bodies. */ if (len0 > 2 && startswith (encoded + len0 - 2, "TB")) len0 -= 2; /* Remove trailing "B" suffixes. */ /* FIXME: brobecker/2006-04-19: Not sure what this are used for... */ if (len0 > 1 && startswith (encoded + len0 - 1, "B")) len0 -= 1; /* Make decoded big enough for possible expansion by operator name. */ decoded.resize (2 * len0 + 1, 'X'); /* Remove trailing __{digit}+ or trailing ${digit}+. */ if (len0 > 1 && isdigit (encoded[len0 - 1])) { i = len0 - 2; while ((i >= 0 && isdigit (encoded[i])) || (i >= 1 && encoded[i] == '_' && isdigit (encoded[i - 1]))) i -= 1; if (i > 1 && encoded[i] == '_' && encoded[i - 1] == '_') len0 = i - 1; else if (encoded[i] == '$') len0 = i; } /* The first few characters that are not alphabetic are not part of any encoding we use, so we can copy them over verbatim. */ for (i = 0, j = 0; i < len0 && !isalpha (encoded[i]); i += 1, j += 1) decoded[j] = encoded[i]; at_start_name = 1; while (i < len0) { /* Is this a symbol function? */ if (at_start_name && encoded[i] == 'O') { int k; for (k = 0; ada_opname_table[k].encoded != NULL; k += 1) { int op_len = strlen (ada_opname_table[k].encoded); if ((strncmp (ada_opname_table[k].encoded + 1, encoded + i + 1, op_len - 1) == 0) && !isalnum (encoded[i + op_len])) { strcpy (&decoded.front() + j, ada_opname_table[k].decoded); at_start_name = 0; i += op_len; j += strlen (ada_opname_table[k].decoded); break; } } if (ada_opname_table[k].encoded != NULL) continue; } at_start_name = 0; /* Replace "TK__" with "__", which will eventually be translated into "." (just below). */ if (i < len0 - 4 && startswith (encoded + i, "TK__")) i += 2; /* Replace "__B_{DIGITS}+__" sequences by "__", which will eventually be translated into "." (just below). These are internal names generated for anonymous blocks inside which our symbol is nested. */ if (len0 - i > 5 && encoded [i] == '_' && encoded [i+1] == '_' && encoded [i+2] == 'B' && encoded [i+3] == '_' && isdigit (encoded [i+4])) { int k = i + 5; while (k < len0 && isdigit (encoded[k])) k++; /* Skip any extra digit. */ /* Double-check that the "__B_{DIGITS}+" sequence we found is indeed followed by "__". */ if (len0 - k > 2 && encoded [k] == '_' && encoded [k+1] == '_') i = k; } /* Remove _E{DIGITS}+[sb] */ /* Just as for protected object subprograms, there are 2 categories of subprograms created by the compiler for each entry. The first one implements the actual entry code, and has a suffix following the convention above; the second one implements the barrier and uses the same convention as above, except that the 'E' is replaced by a 'B'. Just as above, we do not decode the name of barrier functions to give the user a clue that the code he is debugging has been internally generated. */ if (len0 - i > 3 && encoded [i] == '_' && encoded[i+1] == 'E' && isdigit (encoded[i+2])) { int k = i + 3; while (k < len0 && isdigit (encoded[k])) k++; if (k < len0 && (encoded[k] == 'b' || encoded[k] == 's')) { k++; /* Just as an extra precaution, make sure that if this suffix is followed by anything else, it is a '_'. Otherwise, we matched this sequence by accident. */ if (k == len0 || (k < len0 && encoded[k] == '_')) i = k; } } /* Remove trailing "N" in [a-z0-9]+N__. The N is added by the GNAT front-end in protected object subprograms. */ if (i < len0 + 3 && encoded[i] == 'N' && encoded[i+1] == '_' && encoded[i+2] == '_') { /* Backtrack a bit up until we reach either the begining of the encoded name, or "__". Make sure that we only find digits or lowercase characters. */ const char *ptr = encoded + i - 1; while (ptr >= encoded && is_lower_alphanum (ptr[0])) ptr--; if (ptr < encoded || (ptr > encoded && ptr[0] == '_' && ptr[-1] == '_')) i++; } if (encoded[i] == 'X' && i != 0 && isalnum (encoded[i - 1])) { /* This is a X[bn]* sequence not separated from the previous part of the name with a non-alpha-numeric character (in other words, immediately following an alpha-numeric character), then verify that it is placed at the end of the encoded name. If not, then the encoding is not valid and we should abort the decoding. Otherwise, just skip it, it is used in body-nested package names. */ do i += 1; while (i < len0 && (encoded[i] == 'b' || encoded[i] == 'n')); if (i < len0) goto Suppress; } else if (i < len0 - 2 && encoded[i] == '_' && encoded[i + 1] == '_') { /* Replace '__' by '.'. */ decoded[j] = '.'; at_start_name = 1; i += 2; j += 1; } else { /* It's a character part of the decoded name, so just copy it over. */ decoded[j] = encoded[i]; i += 1; j += 1; } } decoded.resize (j); /* Decoded names should never contain any uppercase character. Double-check this, and abort the decoding if we find one. */ for (i = 0; i < decoded.length(); ++i) if (isupper (decoded[i]) || decoded[i] == ' ') goto Suppress; return decoded; Suppress: if (encoded[0] == '<') decoded = encoded; else decoded = '<' + std::string(encoded) + '>'; return decoded; } /* Table for keeping permanent unique copies of decoded names. Once allocated, names in this table are never released. While this is a storage leak, it should not be significant unless there are massive changes in the set of decoded names in successive versions of a symbol table loaded during a single session. */ static struct htab *decoded_names_store; /* Returns the decoded name of GSYMBOL, as for ada_decode, caching it in the language-specific part of GSYMBOL, if it has not been previously computed. Tries to save the decoded name in the same obstack as GSYMBOL, if possible, and otherwise on the heap (so that, in any case, the decoded symbol has a lifetime at least that of GSYMBOL). The GSYMBOL parameter is "mutable" in the C++ sense: logically const, but nevertheless modified to a semantically equivalent form when a decoded name is cached in it. */ const char * ada_decode_symbol (const struct general_symbol_info *arg) { struct general_symbol_info *gsymbol = (struct general_symbol_info *) arg; const char **resultp = &gsymbol->language_specific.demangled_name; if (!gsymbol->ada_mangled) { std::string decoded = ada_decode (gsymbol->name); struct obstack *obstack = gsymbol->language_specific.obstack; gsymbol->ada_mangled = 1; if (obstack != NULL) *resultp = obstack_strdup (obstack, decoded.c_str ()); else { /* Sometimes, we can't find a corresponding objfile, in which case, we put the result on the heap. Since we only decode when needed, we hope this usually does not cause a significant memory leak (FIXME). */ char **slot = (char **) htab_find_slot (decoded_names_store, decoded.c_str (), INSERT); if (*slot == NULL) *slot = xstrdup (decoded.c_str ()); *resultp = *slot; } } return *resultp; } static char * ada_la_decode (const char *encoded, int options) { return xstrdup (ada_decode (encoded).c_str ()); } /* Implement la_sniff_from_mangled_name for Ada. */ static int ada_sniff_from_mangled_name (const char *mangled, char **out) { std::string demangled = ada_decode (mangled); *out = NULL; if (demangled != mangled && demangled[0] != '<') { /* Set the gsymbol language to Ada, but still return 0. Two reasons for that: 1. For Ada, we prefer computing the symbol's decoded name on the fly rather than pre-compute it, in order to save memory (Ada projects are typically very large). 2. There are some areas in the definition of the GNAT encoding where, with a bit of bad luck, we might be able to decode a non-Ada symbol, generating an incorrect demangled name (Eg: names ending with "TB" for instance are identified as task bodies and so stripped from the decoded name returned). Returning 1, here, but not setting *DEMANGLED, helps us get a little bit of the best of both worlds. Because we're last, we should not affect any of the other languages that were able to demangle the symbol before us; we get to correctly tag Ada symbols as such; and even if we incorrectly tagged a non-Ada symbol, which should be rare, any routing through the Ada language should be transparent (Ada tries to behave much like C/C++ with non-Ada symbols). */ return 1; } return 0; } /* Arrays */ /* Assuming that INDEX_DESC_TYPE is an ___XA structure, a structure generated by the GNAT compiler to describe the index type used for each dimension of an array, check whether it follows the latest known encoding. If not, fix it up to conform to the latest encoding. Otherwise, do nothing. This function also does nothing if INDEX_DESC_TYPE is NULL. The GNAT encoding used to describe the array index type evolved a bit. Initially, the information would be provided through the name of each field of the structure type only, while the type of these fields was described as unspecified and irrelevant. The debugger was then expected to perform a global type lookup using the name of that field in order to get access to the full index type description. Because these global lookups can be very expensive, the encoding was later enhanced to make the global lookup unnecessary by defining the field type as being the full index type description. The purpose of this routine is to allow us to support older versions of the compiler by detecting the use of the older encoding, and by fixing up the INDEX_DESC_TYPE to follow the new one (at this point, we essentially replace each field's meaningless type by the associated index subtype). */ void ada_fixup_array_indexes_type (struct type *index_desc_type) { int i; if (index_desc_type == NULL) return; gdb_assert (TYPE_NFIELDS (index_desc_type) > 0); /* Check if INDEX_DESC_TYPE follows the older encoding (it is sufficient to check one field only, no need to check them all). If not, return now. If our INDEX_DESC_TYPE was generated using the older encoding, the field type should be a meaningless integer type whose name is not equal to the field name. */ if (TYPE_NAME (TYPE_FIELD_TYPE (index_desc_type, 0)) != NULL && strcmp (TYPE_NAME (TYPE_FIELD_TYPE (index_desc_type, 0)), TYPE_FIELD_NAME (index_desc_type, 0)) == 0) return; /* Fixup each field of INDEX_DESC_TYPE. */ for (i = 0; i < TYPE_NFIELDS (index_desc_type); i++) { const char *name = TYPE_FIELD_NAME (index_desc_type, i); struct type *raw_type = ada_check_typedef (ada_find_any_type (name)); if (raw_type) TYPE_FIELD_TYPE (index_desc_type, i) = raw_type; } } /* Names of MAX_ADA_DIMENS bounds in P_BOUNDS fields of array descriptors. */ static const char *bound_name[] = { "LB0", "UB0", "LB1", "UB1", "LB2", "UB2", "LB3", "UB3", "LB4", "UB4", "LB5", "UB5", "LB6", "UB6", "LB7", "UB7" }; /* Maximum number of array dimensions we are prepared to handle. */ #define MAX_ADA_DIMENS (sizeof(bound_name) / (2*sizeof(char *))) /* The desc_* routines return primitive portions of array descriptors (fat pointers). */ /* The descriptor or array type, if any, indicated by TYPE; removes level of indirection, if needed. */ static struct type * desc_base_type (struct type *type) { if (type == NULL) return NULL; type = ada_check_typedef (type); if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) type = ada_typedef_target_type (type); if (type != NULL && (TYPE_CODE (type) == TYPE_CODE_PTR || TYPE_CODE (type) == TYPE_CODE_REF)) return ada_check_typedef (TYPE_TARGET_TYPE (type)); else return type; } /* True iff TYPE indicates a "thin" array pointer type. */ static int is_thin_pntr (struct type *type) { return is_suffix (ada_type_name (desc_base_type (type)), "___XUT") || is_suffix (ada_type_name (desc_base_type (type)), "___XUT___XVE"); } /* The descriptor type for thin pointer type TYPE. */ static struct type * thin_descriptor_type (struct type *type) { struct type *base_type = desc_base_type (type); if (base_type == NULL) return NULL; if (is_suffix (ada_type_name (base_type), "___XVE")) return base_type; else { struct type *alt_type = ada_find_parallel_type (base_type, "___XVE"); if (alt_type == NULL) return base_type; else return alt_type; } } /* A pointer to the array data for thin-pointer value VAL. */ static struct value * thin_data_pntr (struct value *val) { struct type *type = ada_check_typedef (value_type (val)); struct type *data_type = desc_data_target_type (thin_descriptor_type (type)); data_type = lookup_pointer_type (data_type); if (TYPE_CODE (type) == TYPE_CODE_PTR) return value_cast (data_type, value_copy (val)); else return value_from_longest (data_type, value_address (val)); } /* True iff TYPE indicates a "thick" array pointer type. */ static int is_thick_pntr (struct type *type) { type = desc_base_type (type); return (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT && lookup_struct_elt_type (type, "P_BOUNDS", 1) != NULL); } /* If TYPE is the type of an array descriptor (fat or thin pointer) or a pointer to one, the type of its bounds data; otherwise, NULL. */ static struct type * desc_bounds_type (struct type *type) { struct type *r; type = desc_base_type (type); if (type == NULL) return NULL; else if (is_thin_pntr (type)) { type = thin_descriptor_type (type); if (type == NULL) return NULL; r = lookup_struct_elt_type (type, "BOUNDS", 1); if (r != NULL) return ada_check_typedef (r); } else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) { r = lookup_struct_elt_type (type, "P_BOUNDS", 1); if (r != NULL) return ada_check_typedef (TYPE_TARGET_TYPE (ada_check_typedef (r))); } return NULL; } /* If ARR is an array descriptor (fat or thin pointer), or pointer to one, a pointer to its bounds data. Otherwise NULL. */ static struct value * desc_bounds (struct value *arr) { struct type *type = ada_check_typedef (value_type (arr)); if (is_thin_pntr (type)) { struct type *bounds_type = desc_bounds_type (thin_descriptor_type (type)); LONGEST addr; if (bounds_type == NULL) error (_("Bad GNAT array descriptor")); /* NOTE: The following calculation is not really kosher, but since desc_type is an XVE-encoded type (and shouldn't be), the correct calculation is a real pain. FIXME (and fix GCC). */ if (TYPE_CODE (type) == TYPE_CODE_PTR) addr = value_as_long (arr); else addr = value_address (arr); return value_from_longest (lookup_pointer_type (bounds_type), addr - TYPE_LENGTH (bounds_type)); } else if (is_thick_pntr (type)) { struct value *p_bounds = value_struct_elt (&arr, NULL, "P_BOUNDS", NULL, _("Bad GNAT array descriptor")); struct type *p_bounds_type = value_type (p_bounds); if (p_bounds_type && TYPE_CODE (p_bounds_type) == TYPE_CODE_PTR) { struct type *target_type = TYPE_TARGET_TYPE (p_bounds_type); if (TYPE_STUB (target_type)) p_bounds = value_cast (lookup_pointer_type (ada_check_typedef (target_type)), p_bounds); } else error (_("Bad GNAT array descriptor")); return p_bounds; } else return NULL; } /* If TYPE is the type of an array-descriptor (fat pointer), the bit position of the field containing the address of the bounds data. */ static int fat_pntr_bounds_bitpos (struct type *type) { return TYPE_FIELD_BITPOS (desc_base_type (type), 1); } /* If TYPE is the type of an array-descriptor (fat pointer), the bit size of the field containing the address of the bounds data. */ static int fat_pntr_bounds_bitsize (struct type *type) { type = desc_base_type (type); if (TYPE_FIELD_BITSIZE (type, 1) > 0) return TYPE_FIELD_BITSIZE (type, 1); else return 8 * TYPE_LENGTH (ada_check_typedef (TYPE_FIELD_TYPE (type, 1))); } /* If TYPE is the type of an array descriptor (fat or thin pointer) or a pointer to one, the type of its array data (a array-with-no-bounds type); otherwise, NULL. Use ada_type_of_array to get an array type with bounds data. */ static struct type * desc_data_target_type (struct type *type) { type = desc_base_type (type); /* NOTE: The following is bogus; see comment in desc_bounds. */ if (is_thin_pntr (type)) return desc_base_type (TYPE_FIELD_TYPE (thin_descriptor_type (type), 1)); else if (is_thick_pntr (type)) { struct type *data_type = lookup_struct_elt_type (type, "P_ARRAY", 1); if (data_type && TYPE_CODE (ada_check_typedef (data_type)) == TYPE_CODE_PTR) return ada_check_typedef (TYPE_TARGET_TYPE (data_type)); } return NULL; } /* If ARR is an array descriptor (fat or thin pointer), a pointer to its array data. */ static struct value * desc_data (struct value *arr) { struct type *type = value_type (arr); if (is_thin_pntr (type)) return thin_data_pntr (arr); else if (is_thick_pntr (type)) return value_struct_elt (&arr, NULL, "P_ARRAY", NULL, _("Bad GNAT array descriptor")); else return NULL; } /* If TYPE is the type of an array-descriptor (fat pointer), the bit position of the field containing the address of the data. */ static int fat_pntr_data_bitpos (struct type *type) { return TYPE_FIELD_BITPOS (desc_base_type (type), 0); } /* If TYPE is the type of an array-descriptor (fat pointer), the bit size of the field containing the address of the data. */ static int fat_pntr_data_bitsize (struct type *type) { type = desc_base_type (type); if (TYPE_FIELD_BITSIZE (type, 0) > 0) return TYPE_FIELD_BITSIZE (type, 0); else return TARGET_CHAR_BIT * TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)); } /* If BOUNDS is an array-bounds structure (or pointer to one), return the Ith lower bound stored in it, if WHICH is 0, and the Ith upper bound, if WHICH is 1. The first bound is I=1. */ static struct value * desc_one_bound (struct value *bounds, int i, int which) { return value_struct_elt (&bounds, NULL, bound_name[2 * i + which - 2], NULL, _("Bad GNAT array descriptor bounds")); } /* If BOUNDS is an array-bounds structure type, return the bit position of the Ith lower bound stored in it, if WHICH is 0, and the Ith upper bound, if WHICH is 1. The first bound is I=1. */ static int desc_bound_bitpos (struct type *type, int i, int which) { return TYPE_FIELD_BITPOS (desc_base_type (type), 2 * i + which - 2); } /* If BOUNDS is an array-bounds structure type, return the bit field size of the Ith lower bound stored in it, if WHICH is 0, and the Ith upper bound, if WHICH is 1. The first bound is I=1. */ static int desc_bound_bitsize (struct type *type, int i, int which) { type = desc_base_type (type); if (TYPE_FIELD_BITSIZE (type, 2 * i + which - 2) > 0) return TYPE_FIELD_BITSIZE (type, 2 * i + which - 2); else return 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (type, 2 * i + which - 2)); } /* If TYPE is the type of an array-bounds structure, the type of its Ith bound (numbering from 1). Otherwise, NULL. */ static struct type * desc_index_type (struct type *type, int i) { type = desc_base_type (type); if (TYPE_CODE (type) == TYPE_CODE_STRUCT) return lookup_struct_elt_type (type, bound_name[2 * i - 2], 1); else return NULL; } /* The number of index positions in the array-bounds type TYPE. Return 0 if TYPE is NULL. */ static int desc_arity (struct type *type) { type = desc_base_type (type); if (type != NULL) return TYPE_NFIELDS (type) / 2; return 0; } /* Non-zero iff TYPE is a simple array type (not a pointer to one) or an array descriptor type (representing an unconstrained array type). */ static int ada_is_direct_array_type (struct type *type) { if (type == NULL) return 0; type = ada_check_typedef (type); return (TYPE_CODE (type) == TYPE_CODE_ARRAY || ada_is_array_descriptor_type (type)); } /* Non-zero iff TYPE represents any kind of array in Ada, or a pointer * to one. */ static int ada_is_array_type (struct type *type) { while (type != NULL && (TYPE_CODE (type) == TYPE_CODE_PTR || TYPE_CODE (type) == TYPE_CODE_REF)) type = TYPE_TARGET_TYPE (type); return ada_is_direct_array_type (type); } /* Non-zero iff TYPE is a simple array type or pointer to one. */ int ada_is_simple_array_type (struct type *type) { if (type == NULL) return 0; type = ada_check_typedef (type); return (TYPE_CODE (type) == TYPE_CODE_ARRAY || (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_CODE (ada_check_typedef (TYPE_TARGET_TYPE (type))) == TYPE_CODE_ARRAY)); } /* Non-zero iff TYPE belongs to a GNAT array descriptor. */ int ada_is_array_descriptor_type (struct type *type) { struct type *data_type = desc_data_target_type (type); if (type == NULL) return 0; type = ada_check_typedef (type); return (data_type != NULL && TYPE_CODE (data_type) == TYPE_CODE_ARRAY && desc_arity (desc_bounds_type (type)) > 0); } /* Non-zero iff type is a partially mal-formed GNAT array descriptor. FIXME: This is to compensate for some problems with debugging output from GNAT. Re-examine periodically to see if it is still needed. */ int ada_is_bogus_array_descriptor (struct type *type) { return type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT && (lookup_struct_elt_type (type, "P_BOUNDS", 1) != NULL || lookup_struct_elt_type (type, "P_ARRAY", 1) != NULL) && !ada_is_array_descriptor_type (type); } /* If ARR has a record type in the form of a standard GNAT array descriptor, (fat pointer) returns the type of the array data described---specifically, a pointer-to-array type. If BOUNDS is non-zero, the bounds data are filled in from the descriptor; otherwise, they are left unspecified. If the ARR denotes a null array descriptor and BOUNDS is non-zero, returns NULL. The result is simply the type of ARR if ARR is not a descriptor. */ static struct type * ada_type_of_array (struct value *arr, int bounds) { if (ada_is_constrained_packed_array_type (value_type (arr))) return decode_constrained_packed_array_type (value_type (arr)); if (!ada_is_array_descriptor_type (value_type (arr))) return value_type (arr); if (!bounds) { struct type *array_type = ada_check_typedef (desc_data_target_type (value_type (arr))); if (ada_is_unconstrained_packed_array_type (value_type (arr))) TYPE_FIELD_BITSIZE (array_type, 0) = decode_packed_array_bitsize (value_type (arr)); return array_type; } else { struct type *elt_type; int arity; struct value *descriptor; elt_type = ada_array_element_type (value_type (arr), -1); arity = ada_array_arity (value_type (arr)); if (elt_type == NULL || arity == 0) return ada_check_typedef (value_type (arr)); descriptor = desc_bounds (arr); if (value_as_long (descriptor) == 0) return NULL; while (arity > 0) { struct type *range_type = alloc_type_copy (value_type (arr)); struct type *array_type = alloc_type_copy (value_type (arr)); struct value *low = desc_one_bound (descriptor, arity, 0); struct value *high = desc_one_bound (descriptor, arity, 1); arity -= 1; create_static_range_type (range_type, value_type (low), longest_to_int (value_as_long (low)), longest_to_int (value_as_long (high))); elt_type = create_array_type (array_type, elt_type, range_type); if (ada_is_unconstrained_packed_array_type (value_type (arr))) { /* We need to store the element packed bitsize, as well as recompute the array size, because it was previously computed based on the unpacked element size. */ LONGEST lo = value_as_long (low); LONGEST hi = value_as_long (high); TYPE_FIELD_BITSIZE (elt_type, 0) = decode_packed_array_bitsize (value_type (arr)); /* If the array has no element, then the size is already zero, and does not need to be recomputed. */ if (lo < hi) { int array_bitsize = (hi - lo + 1) * TYPE_FIELD_BITSIZE (elt_type, 0); TYPE_LENGTH (array_type) = (array_bitsize + 7) / 8; } } } return lookup_pointer_type (elt_type); } } /* If ARR does not represent an array, returns ARR unchanged. Otherwise, returns either a standard GDB array with bounds set appropriately or, if ARR is a non-null fat pointer, a pointer to a standard GDB array. Returns NULL if ARR is a null fat pointer. */ struct value * ada_coerce_to_simple_array_ptr (struct value *arr) { if (ada_is_array_descriptor_type (value_type (arr))) { struct type *arrType = ada_type_of_array (arr, 1); if (arrType == NULL) return NULL; return value_cast (arrType, value_copy (desc_data (arr))); } else if (ada_is_constrained_packed_array_type (value_type (arr))) return decode_constrained_packed_array (arr); else return arr; } /* If ARR does not represent an array, returns ARR unchanged. Otherwise, returns a standard GDB array describing ARR (which may be ARR itself if it already is in the proper form). */ struct value * ada_coerce_to_simple_array (struct value *arr) { if (ada_is_array_descriptor_type (value_type (arr))) { struct value *arrVal = ada_coerce_to_simple_array_ptr (arr); if (arrVal == NULL) error (_("Bounds unavailable for null array pointer.")); ada_ensure_varsize_limit (TYPE_TARGET_TYPE (value_type (arrVal))); return value_ind (arrVal); } else if (ada_is_constrained_packed_array_type (value_type (arr))) return decode_constrained_packed_array (arr); else return arr; } /* If TYPE represents a GNAT array type, return it translated to an ordinary GDB array type (possibly with BITSIZE fields indicating packing). For other types, is the identity. */ struct type * ada_coerce_to_simple_array_type (struct type *type) { if (ada_is_constrained_packed_array_type (type)) return decode_constrained_packed_array_type (type); if (ada_is_array_descriptor_type (type)) return ada_check_typedef (desc_data_target_type (type)); return type; } /* Non-zero iff TYPE represents a standard GNAT packed-array type. */ static int ada_is_packed_array_type (struct type *type) { if (type == NULL) return 0; type = desc_base_type (type); type = ada_check_typedef (type); return ada_type_name (type) != NULL && strstr (ada_type_name (type), "___XP") != NULL; } /* Non-zero iff TYPE represents a standard GNAT constrained packed-array type. */ int ada_is_constrained_packed_array_type (struct type *type) { return ada_is_packed_array_type (type) && !ada_is_array_descriptor_type (type); } /* Non-zero iff TYPE represents an array descriptor for a unconstrained packed-array type. */ static int ada_is_unconstrained_packed_array_type (struct type *type) { return ada_is_packed_array_type (type) && ada_is_array_descriptor_type (type); } /* Given that TYPE encodes a packed array type (constrained or unconstrained), return the size of its elements in bits. */ static long decode_packed_array_bitsize (struct type *type) { const char *raw_name; const char *tail; long bits; /* Access to arrays implemented as fat pointers are encoded as a typedef of the fat pointer type. We need the name of the fat pointer type to do the decoding, so strip the typedef layer. */ if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) type = ada_typedef_target_type (type); raw_name = ada_type_name (ada_check_typedef (type)); if (!raw_name) raw_name = ada_type_name (desc_base_type (type)); if (!raw_name) return 0; tail = strstr (raw_name, "___XP"); gdb_assert (tail != NULL); if (sscanf (tail + sizeof ("___XP") - 1, "%ld", &bits) != 1) { lim_warning (_("could not understand bit size information on packed array")); return 0; } return bits; } /* Given that TYPE is a standard GDB array type with all bounds filled in, and that the element size of its ultimate scalar constituents (that is, either its elements, or, if it is an array of arrays, its elements' elements, etc.) is *ELT_BITS, return an identical type, but with the bit sizes of its elements (and those of any constituent arrays) recorded in the BITSIZE components of its TYPE_FIELD_BITSIZE values, and with *ELT_BITS set to its total size in bits. Note that, for arrays whose index type has an XA encoding where a bound references a record discriminant, getting that discriminant, and therefore the actual value of that bound, is not possible because none of the given parameters gives us access to the record. This function assumes that it is OK in the context where it is being used to return an array whose bounds are still dynamic and where the length is arbitrary. */ static struct type * constrained_packed_array_type (struct type *type, long *elt_bits) { struct type *new_elt_type; struct type *new_type; struct type *index_type_desc; struct type *index_type; LONGEST low_bound, high_bound; type = ada_check_typedef (type); if (TYPE_CODE (type) != TYPE_CODE_ARRAY) return type; index_type_desc = ada_find_parallel_type (type, "___XA"); if (index_type_desc) index_type = to_fixed_range_type (TYPE_FIELD_TYPE (index_type_desc, 0), NULL); else index_type = TYPE_INDEX_TYPE (type); new_type = alloc_type_copy (type); new_elt_type = constrained_packed_array_type (ada_check_typedef (TYPE_TARGET_TYPE (type)), elt_bits); create_array_type (new_type, new_elt_type, index_type); TYPE_FIELD_BITSIZE (new_type, 0) = *elt_bits; TYPE_NAME (new_type) = ada_type_name (type); if ((TYPE_CODE (check_typedef (index_type)) == TYPE_CODE_RANGE && is_dynamic_type (check_typedef (index_type))) || get_discrete_bounds (index_type, &low_bound, &high_bound) < 0) low_bound = high_bound = 0; if (high_bound < low_bound) *elt_bits = TYPE_LENGTH (new_type) = 0; else { *elt_bits *= (high_bound - low_bound + 1); TYPE_LENGTH (new_type) = (*elt_bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; } TYPE_FIXED_INSTANCE (new_type) = 1; return new_type; } /* The array type encoded by TYPE, where ada_is_constrained_packed_array_type (TYPE). */ static struct type * decode_constrained_packed_array_type (struct type *type) { const char *raw_name = ada_type_name (ada_check_typedef (type)); char *name; const char *tail; struct type *shadow_type; long bits; if (!raw_name) raw_name = ada_type_name (desc_base_type (type)); if (!raw_name) return NULL; name = (char *) alloca (strlen (raw_name) + 1); tail = strstr (raw_name, "___XP"); type = desc_base_type (type); memcpy (name, raw_name, tail - raw_name); name[tail - raw_name] = '\000'; shadow_type = ada_find_parallel_type_with_name (type, name); if (shadow_type == NULL) { lim_warning (_("could not find bounds information on packed array")); return NULL; } shadow_type = check_typedef (shadow_type); if (TYPE_CODE (shadow_type) != TYPE_CODE_ARRAY) { lim_warning (_("could not understand bounds " "information on packed array")); return NULL; } bits = decode_packed_array_bitsize (type); return constrained_packed_array_type (shadow_type, &bits); } /* Given that ARR is a struct value *indicating a GNAT constrained packed array, returns a simple array that denotes that array. Its type is a standard GDB array type except that the BITSIZEs of the array target types are set to the number of bits in each element, and the type length is set appropriately. */ static struct value * decode_constrained_packed_array (struct value *arr) { struct type *type; /* If our value is a pointer, then dereference it. Likewise if the value is a reference. Make sure that this operation does not cause the target type to be fixed, as this would indirectly cause this array to be decoded. The rest of the routine assumes that the array hasn't been decoded yet, so we use the basic "coerce_ref" and "value_ind" routines to perform the dereferencing, as opposed to using "ada_coerce_ref" or "ada_value_ind". */ arr = coerce_ref (arr); if (TYPE_CODE (ada_check_typedef (value_type (arr))) == TYPE_CODE_PTR) arr = value_ind (arr); type = decode_constrained_packed_array_type (value_type (arr)); if (type == NULL) { error (_("can't unpack array")); return NULL; } if (type_byte_order (value_type (arr)) == BFD_ENDIAN_BIG && ada_is_modular_type (value_type (arr))) { /* This is a (right-justified) modular type representing a packed array with no wrapper. In order to interpret the value through the (left-justified) packed array type we just built, we must first left-justify it. */ int bit_size, bit_pos; ULONGEST mod; mod = ada_modulus (value_type (arr)) - 1; bit_size = 0; while (mod > 0) { bit_size += 1; mod >>= 1; } bit_pos = HOST_CHAR_BIT * TYPE_LENGTH (value_type (arr)) - bit_size; arr = ada_value_primitive_packed_val (arr, NULL, bit_pos / HOST_CHAR_BIT, bit_pos % HOST_CHAR_BIT, bit_size, type); } return coerce_unspec_val_to_type (arr, type); } /* The value of the element of packed array ARR at the ARITY indices given in IND. ARR must be a simple array. */ static struct value * value_subscript_packed (struct value *arr, int arity, struct value **ind) { int i; int bits, elt_off, bit_off; long elt_total_bit_offset; struct type *elt_type; struct value *v; bits = 0; elt_total_bit_offset = 0; elt_type = ada_check_typedef (value_type (arr)); for (i = 0; i < arity; i += 1) { if (TYPE_CODE (elt_type) != TYPE_CODE_ARRAY || TYPE_FIELD_BITSIZE (elt_type, 0) == 0) error (_("attempt to do packed indexing of " "something other than a packed array")); else { struct type *range_type = TYPE_INDEX_TYPE (elt_type); LONGEST lowerbound, upperbound; LONGEST idx; if (get_discrete_bounds (range_type, &lowerbound, &upperbound) < 0) { lim_warning (_("don't know bounds of array")); lowerbound = upperbound = 0; } idx = pos_atr (ind[i]); if (idx < lowerbound || idx > upperbound) lim_warning (_("packed array index %ld out of bounds"), (long) idx); bits = TYPE_FIELD_BITSIZE (elt_type, 0); elt_total_bit_offset += (idx - lowerbound) * bits; elt_type = ada_check_typedef (TYPE_TARGET_TYPE (elt_type)); } } elt_off = elt_total_bit_offset / HOST_CHAR_BIT; bit_off = elt_total_bit_offset % HOST_CHAR_BIT; v = ada_value_primitive_packed_val (arr, NULL, elt_off, bit_off, bits, elt_type); return v; } /* Non-zero iff TYPE includes negative integer values. */ static int has_negatives (struct type *type) { switch (TYPE_CODE (type)) { default: return 0; case TYPE_CODE_INT: return !TYPE_UNSIGNED (type); case TYPE_CODE_RANGE: return TYPE_LOW_BOUND (type) - TYPE_RANGE_DATA (type)->bias < 0; } } /* With SRC being a buffer containing BIT_SIZE bits of data at BIT_OFFSET, unpack that data into UNPACKED. UNPACKED_LEN is the size in bytes of the unpacked buffer. The size of the unpacked buffer (UNPACKED_LEN) is expected to be large enough to contain at least BIT_OFFSET bits. If not, an error is raised. IS_BIG_ENDIAN is nonzero if the data is stored in big endian mode, zero otherwise. IS_SIGNED_TYPE is nonzero if the data corresponds to a signed type. IS_SCALAR is nonzero if the data corresponds to a signed type. */ static void ada_unpack_from_contents (const gdb_byte *src, int bit_offset, int bit_size, gdb_byte *unpacked, int unpacked_len, int is_big_endian, int is_signed_type, int is_scalar) { int src_len = (bit_size + bit_offset + HOST_CHAR_BIT - 1) / 8; int src_idx; /* Index into the source area */ int src_bytes_left; /* Number of source bytes left to process. */ int srcBitsLeft; /* Number of source bits left to move */ int unusedLS; /* Number of bits in next significant byte of source that are unused */ int unpacked_idx; /* Index into the unpacked buffer */ int unpacked_bytes_left; /* Number of bytes left to set in unpacked. */ unsigned long accum; /* Staging area for bits being transferred */ int accumSize; /* Number of meaningful bits in accum */ unsigned char sign; /* Transmit bytes from least to most significant; delta is the direction the indices move. */ int delta = is_big_endian ? -1 : 1; /* Make sure that unpacked is large enough to receive the BIT_SIZE bits from SRC. .*/ if ((bit_size + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT > unpacked_len) error (_("Cannot unpack %d bits into buffer of %d bytes"), bit_size, unpacked_len); srcBitsLeft = bit_size; src_bytes_left = src_len; unpacked_bytes_left = unpacked_len; sign = 0; if (is_big_endian) { src_idx = src_len - 1; if (is_signed_type && ((src[0] << bit_offset) & (1 << (HOST_CHAR_BIT - 1)))) sign = ~0; unusedLS = (HOST_CHAR_BIT - (bit_size + bit_offset) % HOST_CHAR_BIT) % HOST_CHAR_BIT; if (is_scalar) { accumSize = 0; unpacked_idx = unpacked_len - 1; } else { /* Non-scalar values must be aligned at a byte boundary... */ accumSize = (HOST_CHAR_BIT - bit_size % HOST_CHAR_BIT) % HOST_CHAR_BIT; /* ... And are placed at the beginning (most-significant) bytes of the target. */ unpacked_idx = (bit_size + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT - 1; unpacked_bytes_left = unpacked_idx + 1; } } else { int sign_bit_offset = (bit_size + bit_offset - 1) % 8; src_idx = unpacked_idx = 0; unusedLS = bit_offset; accumSize = 0; if (is_signed_type && (src[src_len - 1] & (1 << sign_bit_offset))) sign = ~0; } accum = 0; while (src_bytes_left > 0) { /* Mask for removing bits of the next source byte that are not part of the value. */ unsigned int unusedMSMask = (1 << (srcBitsLeft >= HOST_CHAR_BIT ? HOST_CHAR_BIT : srcBitsLeft)) - 1; /* Sign-extend bits for this byte. */ unsigned int signMask = sign & ~unusedMSMask; accum |= (((src[src_idx] >> unusedLS) & unusedMSMask) | signMask) << accumSize; accumSize += HOST_CHAR_BIT - unusedLS; if (accumSize >= HOST_CHAR_BIT) { unpacked[unpacked_idx] = accum & ~(~0UL << HOST_CHAR_BIT); accumSize -= HOST_CHAR_BIT; accum >>= HOST_CHAR_BIT; unpacked_bytes_left -= 1; unpacked_idx += delta; } srcBitsLeft -= HOST_CHAR_BIT - unusedLS; unusedLS = 0; src_bytes_left -= 1; src_idx += delta; } while (unpacked_bytes_left > 0) { accum |= sign << accumSize; unpacked[unpacked_idx] = accum & ~(~0UL << HOST_CHAR_BIT); accumSize -= HOST_CHAR_BIT; if (accumSize < 0) accumSize = 0; accum >>= HOST_CHAR_BIT; unpacked_bytes_left -= 1; unpacked_idx += delta; } } /* Create a new value of type TYPE from the contents of OBJ starting at byte OFFSET, and bit offset BIT_OFFSET within that byte, proceeding for BIT_SIZE bits. If OBJ is an lval in memory, then assigning through the result will set the field fetched from. VALADDR is ignored unless OBJ is NULL, in which case, VALADDR+OFFSET must address the start of storage containing the packed value. The value returned in this case is never an lval. Assumes 0 <= BIT_OFFSET < HOST_CHAR_BIT. */ struct value * ada_value_primitive_packed_val (struct value *obj, const gdb_byte *valaddr, long offset, int bit_offset, int bit_size, struct type *type) { struct value *v; const gdb_byte *src; /* First byte containing data to unpack */ gdb_byte *unpacked; const int is_scalar = is_scalar_type (type); const int is_big_endian = type_byte_order (type) == BFD_ENDIAN_BIG; gdb::byte_vector staging; type = ada_check_typedef (type); if (obj == NULL) src = valaddr + offset; else src = value_contents (obj) + offset; if (is_dynamic_type (type)) { /* The length of TYPE might by dynamic, so we need to resolve TYPE in order to know its actual size, which we then use to create the contents buffer of the value we return. The difficulty is that the data containing our object is packed, and therefore maybe not at a byte boundary. So, what we do, is unpack the data into a byte-aligned buffer, and then use that buffer as our object's value for resolving the type. */ int staging_len = (bit_size + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; staging.resize (staging_len); ada_unpack_from_contents (src, bit_offset, bit_size, staging.data (), staging.size (), is_big_endian, has_negatives (type), is_scalar); type = resolve_dynamic_type (type, staging.data (), 0); if (TYPE_LENGTH (type) < (bit_size + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT) { /* This happens when the length of the object is dynamic, and is actually smaller than the space reserved for it. For instance, in an array of variant records, the bit_size we're given is the array stride, which is constant and normally equal to the maximum size of its element. But, in reality, each element only actually spans a portion of that stride. */ bit_size = TYPE_LENGTH (type) * HOST_CHAR_BIT; } } if (obj == NULL) { v = allocate_value (type); src = valaddr + offset; } else if (VALUE_LVAL (obj) == lval_memory && value_lazy (obj)) { int src_len = (bit_size + bit_offset + HOST_CHAR_BIT - 1) / 8; gdb_byte *buf; v = value_at (type, value_address (obj) + offset); buf = (gdb_byte *) alloca (src_len); read_memory (value_address (v), buf, src_len); src = buf; } else { v = allocate_value (type); src = value_contents (obj) + offset; } if (obj != NULL) { long new_offset = offset; set_value_component_location (v, obj); set_value_bitpos (v, bit_offset + value_bitpos (obj)); set_value_bitsize (v, bit_size); if (value_bitpos (v) >= HOST_CHAR_BIT) { ++new_offset; set_value_bitpos (v, value_bitpos (v) - HOST_CHAR_BIT); } set_value_offset (v, new_offset); /* Also set the parent value. This is needed when trying to assign a new value (in inferior memory). */ set_value_parent (v, obj); } else set_value_bitsize (v, bit_size); unpacked = value_contents_writeable (v); if (bit_size == 0) { memset (unpacked, 0, TYPE_LENGTH (type)); return v; } if (staging.size () == TYPE_LENGTH (type)) { /* Small short-cut: If we've unpacked the data into a buffer of the same size as TYPE's length, then we can reuse that, instead of doing the unpacking again. */ memcpy (unpacked, staging.data (), staging.size ()); } else ada_unpack_from_contents (src, bit_offset, bit_size, unpacked, TYPE_LENGTH (type), is_big_endian, has_negatives (type), is_scalar); return v; } /* Store the contents of FROMVAL into the location of TOVAL. Return a new value with the location of TOVAL and contents of FROMVAL. Handles assignment into packed fields that have floating-point or non-scalar types. */ static struct value * ada_value_assign (struct value *toval, struct value *fromval) { struct type *type = value_type (toval); int bits = value_bitsize (toval); toval = ada_coerce_ref (toval); fromval = ada_coerce_ref (fromval); if (ada_is_direct_array_type (value_type (toval))) toval = ada_coerce_to_simple_array (toval); if (ada_is_direct_array_type (value_type (fromval))) fromval = ada_coerce_to_simple_array (fromval); if (!deprecated_value_modifiable (toval)) error (_("Left operand of assignment is not a modifiable lvalue.")); if (VALUE_LVAL (toval) == lval_memory && bits > 0 && (TYPE_CODE (type) == TYPE_CODE_FLT || TYPE_CODE (type) == TYPE_CODE_STRUCT)) { int len = (value_bitpos (toval) + bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; int from_size; gdb_byte *buffer = (gdb_byte *) alloca (len); struct value *val; CORE_ADDR to_addr = value_address (toval); if (TYPE_CODE (type) == TYPE_CODE_FLT) fromval = value_cast (type, fromval); read_memory (to_addr, buffer, len); from_size = value_bitsize (fromval); if (from_size == 0) from_size = TYPE_LENGTH (value_type (fromval)) * TARGET_CHAR_BIT; const int is_big_endian = type_byte_order (type) == BFD_ENDIAN_BIG; ULONGEST from_offset = 0; if (is_big_endian && is_scalar_type (value_type (fromval))) from_offset = from_size - bits; copy_bitwise (buffer, value_bitpos (toval), value_contents (fromval), from_offset, bits, is_big_endian); write_memory_with_notification (to_addr, buffer, len); val = value_copy (toval); memcpy (value_contents_raw (val), value_contents (fromval), TYPE_LENGTH (type)); deprecated_set_value_type (val, type); return val; } return value_assign (toval, fromval); } /* Given that COMPONENT is a memory lvalue that is part of the lvalue CONTAINER, assign the contents of VAL to COMPONENTS's place in CONTAINER. Modifies the VALUE_CONTENTS of CONTAINER only, not COMPONENT, and not the inferior's memory. The current contents of COMPONENT are ignored. Although not part of the initial design, this function also works when CONTAINER and COMPONENT are not_lval's: it works as if CONTAINER had a null address, and COMPONENT had an address which is equal to its offset inside CONTAINER. */ static void value_assign_to_component (struct value *container, struct value *component, struct value *val) { LONGEST offset_in_container = (LONGEST) (value_address (component) - value_address (container)); int bit_offset_in_container = value_bitpos (component) - value_bitpos (container); int bits; val = value_cast (value_type (component), val); if (value_bitsize (component) == 0) bits = TARGET_CHAR_BIT * TYPE_LENGTH (value_type (component)); else bits = value_bitsize (component); if (type_byte_order (value_type (container)) == BFD_ENDIAN_BIG) { int src_offset; if (is_scalar_type (check_typedef (value_type (component)))) src_offset = TYPE_LENGTH (value_type (component)) * TARGET_CHAR_BIT - bits; else src_offset = 0; copy_bitwise (value_contents_writeable (container) + offset_in_container, value_bitpos (container) + bit_offset_in_container, value_contents (val), src_offset, bits, 1); } else copy_bitwise (value_contents_writeable (container) + offset_in_container, value_bitpos (container) + bit_offset_in_container, value_contents (val), 0, bits, 0); } /* Determine if TYPE is an access to an unconstrained array. */ bool ada_is_access_to_unconstrained_array (struct type *type) { return (TYPE_CODE (type) == TYPE_CODE_TYPEDEF && is_thick_pntr (ada_typedef_target_type (type))); } /* The value of the element of array ARR at the ARITY indices given in IND. ARR may be either a simple array, GNAT array descriptor, or pointer thereto. */ struct value * ada_value_subscript (struct value *arr, int arity, struct value **ind) { int k; struct value *elt; struct type *elt_type; elt = ada_coerce_to_simple_array (arr); elt_type = ada_check_typedef (value_type (elt)); if (TYPE_CODE (elt_type) == TYPE_CODE_ARRAY && TYPE_FIELD_BITSIZE (elt_type, 0) > 0) return value_subscript_packed (elt, arity, ind); for (k = 0; k < arity; k += 1) { struct type *saved_elt_type = TYPE_TARGET_TYPE (elt_type); if (TYPE_CODE (elt_type) != TYPE_CODE_ARRAY) error (_("too many subscripts (%d expected)"), k); elt = value_subscript (elt, pos_atr (ind[k])); if (ada_is_access_to_unconstrained_array (saved_elt_type) && TYPE_CODE (value_type (elt)) != TYPE_CODE_TYPEDEF) { /* The element is a typedef to an unconstrained array, except that the value_subscript call stripped the typedef layer. The typedef layer is GNAT's way to specify that the element is, at the source level, an access to the unconstrained array, rather than the unconstrained array. So, we need to restore that typedef layer, which we can do by forcing the element's type back to its original type. Otherwise, the returned value is going to be printed as the array, rather than as an access. Another symptom of the same issue would be that an expression trying to dereference the element would also be improperly rejected. */ deprecated_set_value_type (elt, saved_elt_type); } elt_type = ada_check_typedef (value_type (elt)); } return elt; } /* Assuming ARR is a pointer to a GDB array, the value of the element of *ARR at the ARITY indices given in IND. Does not read the entire array into memory. Note: Unlike what one would expect, this function is used instead of ada_value_subscript for basically all non-packed array types. The reason for this is that a side effect of doing our own pointer arithmetics instead of relying on value_subscript is that there is no implicit typedef peeling. This is important for arrays of array accesses, where it allows us to preserve the fact that the array's element is an array access, where the access part os encoded in a typedef layer. */ static struct value * ada_value_ptr_subscript (struct value *arr, int arity, struct value **ind) { int k; struct value *array_ind = ada_value_ind (arr); struct type *type = check_typedef (value_enclosing_type (array_ind)); if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_FIELD_BITSIZE (type, 0) > 0) return value_subscript_packed (array_ind, arity, ind); for (k = 0; k < arity; k += 1) { LONGEST lwb, upb; struct value *lwb_value; if (TYPE_CODE (type) != TYPE_CODE_ARRAY) error (_("too many subscripts (%d expected)"), k); arr = value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (type)), value_copy (arr)); get_discrete_bounds (TYPE_INDEX_TYPE (type), &lwb, &upb); lwb_value = value_from_longest (value_type(ind[k]), lwb); arr = value_ptradd (arr, pos_atr (ind[k]) - pos_atr (lwb_value)); type = TYPE_TARGET_TYPE (type); } return value_ind (arr); } /* Given that ARRAY_PTR is a pointer or reference to an array of type TYPE (the actual type of ARRAY_PTR is ignored), returns the Ada slice of HIGH'Pos-LOW'Pos+1 elements starting at index LOW. The lower bound of this array is LOW, as per Ada rules. */ static struct value * ada_value_slice_from_ptr (struct value *array_ptr, struct type *type, int low, int high) { struct type *type0 = ada_check_typedef (type); struct type *base_index_type = TYPE_TARGET_TYPE (TYPE_INDEX_TYPE (type0)); struct type *index_type = create_static_range_type (NULL, base_index_type, low, high); struct type *slice_type = create_array_type_with_stride (NULL, TYPE_TARGET_TYPE (type0), index_type, get_dyn_prop (DYN_PROP_BYTE_STRIDE, type0), TYPE_FIELD_BITSIZE (type0, 0)); int base_low = ada_discrete_type_low_bound (TYPE_INDEX_TYPE (type0)); LONGEST base_low_pos, low_pos; CORE_ADDR base; if (!discrete_position (base_index_type, low, &low_pos) || !discrete_position (base_index_type, base_low, &base_low_pos)) { warning (_("unable to get positions in slice, use bounds instead")); low_pos = low; base_low_pos = base_low; } base = value_as_address (array_ptr) + ((low_pos - base_low_pos) * TYPE_LENGTH (TYPE_TARGET_TYPE (type0))); return value_at_lazy (slice_type, base); } static struct value * ada_value_slice (struct value *array, int low, int high) { struct type *type = ada_check_typedef (value_type (array)); struct type *base_index_type = TYPE_TARGET_TYPE (TYPE_INDEX_TYPE (type)); struct type *index_type = create_static_range_type (NULL, TYPE_INDEX_TYPE (type), low, high); struct type *slice_type = create_array_type_with_stride (NULL, TYPE_TARGET_TYPE (type), index_type, get_dyn_prop (DYN_PROP_BYTE_STRIDE, type), TYPE_FIELD_BITSIZE (type, 0)); LONGEST low_pos, high_pos; if (!discrete_position (base_index_type, low, &low_pos) || !discrete_position (base_index_type, high, &high_pos)) { warning (_("unable to get positions in slice, use bounds instead")); low_pos = low; high_pos = high; } return value_cast (slice_type, value_slice (array, low, high_pos - low_pos + 1)); } /* If type is a record type in the form of a standard GNAT array descriptor, returns the number of dimensions for type. If arr is a simple array, returns the number of "array of"s that prefix its type designation. Otherwise, returns 0. */ int ada_array_arity (struct type *type) { int arity; if (type == NULL) return 0; type = desc_base_type (type); arity = 0; if (TYPE_CODE (type) == TYPE_CODE_STRUCT) return desc_arity (desc_bounds_type (type)); else while (TYPE_CODE (type) == TYPE_CODE_ARRAY) { arity += 1; type = ada_check_typedef (TYPE_TARGET_TYPE (type)); } return arity; } /* If TYPE is a record type in the form of a standard GNAT array descriptor or a simple array type, returns the element type for TYPE after indexing by NINDICES indices, or by all indices if NINDICES is -1. Otherwise, returns NULL. */ struct type * ada_array_element_type (struct type *type, int nindices) { type = desc_base_type (type); if (TYPE_CODE (type) == TYPE_CODE_STRUCT) { int k; struct type *p_array_type; p_array_type = desc_data_target_type (type); k = ada_array_arity (type); if (k == 0) return NULL; /* Initially p_array_type = elt_type(*)[]...(k times)...[]. */ if (nindices >= 0 && k > nindices) k = nindices; while (k > 0 && p_array_type != NULL) { p_array_type = ada_check_typedef (TYPE_TARGET_TYPE (p_array_type)); k -= 1; } return p_array_type; } else if (TYPE_CODE (type) == TYPE_CODE_ARRAY) { while (nindices != 0 && TYPE_CODE (type) == TYPE_CODE_ARRAY) { type = TYPE_TARGET_TYPE (type); nindices -= 1; } return type; } return NULL; } /* The type of nth index in arrays of given type (n numbering from 1). Does not examine memory. Throws an error if N is invalid or TYPE is not an array type. NAME is the name of the Ada attribute being evaluated ('range, 'first, 'last, or 'length); it is used in building the error message. */ static struct type * ada_index_type (struct type *type, int n, const char *name) { struct type *result_type; type = desc_base_type (type); if (n < 0 || n > ada_array_arity (type)) error (_("invalid dimension number to '%s"), name); if (ada_is_simple_array_type (type)) { int i; for (i = 1; i < n; i += 1) type = TYPE_TARGET_TYPE (type); result_type = TYPE_TARGET_TYPE (TYPE_INDEX_TYPE (type)); /* FIXME: The stabs type r(0,0);bound;bound in an array type has a target type of TYPE_CODE_UNDEF. We compensate here, but perhaps stabsread.c would make more sense. */ if (result_type && TYPE_CODE (result_type) == TYPE_CODE_UNDEF) result_type = NULL; } else { result_type = desc_index_type (desc_bounds_type (type), n); if (result_type == NULL) error (_("attempt to take bound of something that is not an array")); } return result_type; } /* Given that arr is an array type, returns the lower bound of the Nth index (numbering from 1) if WHICH is 0, and the upper bound if WHICH is 1. This returns bounds 0 .. -1 if ARR_TYPE is an array-descriptor type. It works for other arrays with bounds supplied by run-time quantities other than discriminants. */ static LONGEST ada_array_bound_from_type (struct type *arr_type, int n, int which) { struct type *type, *index_type_desc, *index_type; int i; gdb_assert (which == 0 || which == 1); if (ada_is_constrained_packed_array_type (arr_type)) arr_type = decode_constrained_packed_array_type (arr_type); if (arr_type == NULL || !ada_is_simple_array_type (arr_type)) return (LONGEST) - which; if (TYPE_CODE (arr_type) == TYPE_CODE_PTR) type = TYPE_TARGET_TYPE (arr_type); else type = arr_type; if (TYPE_FIXED_INSTANCE (type)) { /* The array has already been fixed, so we do not need to check the parallel ___XA type again. That encoding has already been applied, so ignore it now. */ index_type_desc = NULL; } else { index_type_desc = ada_find_parallel_type (type, "___XA"); ada_fixup_array_indexes_type (index_type_desc); } if (index_type_desc != NULL) index_type = to_fixed_range_type (TYPE_FIELD_TYPE (index_type_desc, n - 1), NULL); else { struct type *elt_type = check_typedef (type); for (i = 1; i < n; i++) elt_type = check_typedef (TYPE_TARGET_TYPE (elt_type)); index_type = TYPE_INDEX_TYPE (elt_type); } return (LONGEST) (which == 0 ? ada_discrete_type_low_bound (index_type) : ada_discrete_type_high_bound (index_type)); } /* Given that arr is an array value, returns the lower bound of the nth index (numbering from 1) if WHICH is 0, and the upper bound if WHICH is 1. This routine will also work for arrays with bounds supplied by run-time quantities other than discriminants. */ static LONGEST ada_array_bound (struct value *arr, int n, int which) { struct type *arr_type; if (TYPE_CODE (check_typedef (value_type (arr))) == TYPE_CODE_PTR) arr = value_ind (arr); arr_type = value_enclosing_type (arr); if (ada_is_constrained_packed_array_type (arr_type)) return ada_array_bound (decode_constrained_packed_array (arr), n, which); else if (ada_is_simple_array_type (arr_type)) return ada_array_bound_from_type (arr_type, n, which); else return value_as_long (desc_one_bound (desc_bounds (arr), n, which)); } /* Given that arr is an array value, returns the length of the nth index. This routine will also work for arrays with bounds supplied by run-time quantities other than discriminants. Does not work for arrays indexed by enumeration types with representation clauses at the moment. */ static LONGEST ada_array_length (struct value *arr, int n) { struct type *arr_type, *index_type; int low, high; if (TYPE_CODE (check_typedef (value_type (arr))) == TYPE_CODE_PTR) arr = value_ind (arr); arr_type = value_enclosing_type (arr); if (ada_is_constrained_packed_array_type (arr_type)) return ada_array_length (decode_constrained_packed_array (arr), n); if (ada_is_simple_array_type (arr_type)) { low = ada_array_bound_from_type (arr_type, n, 0); high = ada_array_bound_from_type (arr_type, n, 1); } else { low = value_as_long (desc_one_bound (desc_bounds (arr), n, 0)); high = value_as_long (desc_one_bound (desc_bounds (arr), n, 1)); } arr_type = check_typedef (arr_type); index_type = ada_index_type (arr_type, n, "length"); if (index_type != NULL) { struct type *base_type; if (TYPE_CODE (index_type) == TYPE_CODE_RANGE) base_type = TYPE_TARGET_TYPE (index_type); else base_type = index_type; low = pos_atr (value_from_longest (base_type, low)); high = pos_atr (value_from_longest (base_type, high)); } return high - low + 1; } /* An array whose type is that of ARR_TYPE (an array type), with bounds LOW to HIGH, but whose contents are unimportant. If HIGH is less than LOW, then LOW-1 is used. */ static struct value * empty_array (struct type *arr_type, int low, int high) { struct type *arr_type0 = ada_check_typedef (arr_type); struct type *index_type = create_static_range_type (NULL, TYPE_TARGET_TYPE (TYPE_INDEX_TYPE (arr_type0)), low, high < low ? low - 1 : high); struct type *elt_type = ada_array_element_type (arr_type0, 1); return allocate_value (create_array_type (NULL, elt_type, index_type)); } /* Name resolution */ /* The "decoded" name for the user-definable Ada operator corresponding to OP. */ static const char * ada_decoded_op_name (enum exp_opcode op) { int i; for (i = 0; ada_opname_table[i].encoded != NULL; i += 1) { if (ada_opname_table[i].op == op) return ada_opname_table[i].decoded; } error (_("Could not find operator name for opcode")); } /* Returns true (non-zero) iff decoded name N0 should appear before N1 in a listing of choices during disambiguation (see sort_choices, below). The idea is that overloadings of a subprogram name from the same package should sort in their source order. We settle for ordering such symbols by their trailing number (__N or $N). */ static int encoded_ordered_before (const char *N0, const char *N1) { if (N1 == NULL) return 0; else if (N0 == NULL) return 1; else { int k0, k1; for (k0 = strlen (N0) - 1; k0 > 0 && isdigit (N0[k0]); k0 -= 1) ; for (k1 = strlen (N1) - 1; k1 > 0 && isdigit (N1[k1]); k1 -= 1) ; if ((N0[k0] == '_' || N0[k0] == '$') && N0[k0 + 1] != '\000' && (N1[k1] == '_' || N1[k1] == '$') && N1[k1 + 1] != '\000') { int n0, n1; n0 = k0; while (N0[n0] == '_' && n0 > 0 && N0[n0 - 1] == '_') n0 -= 1; n1 = k1; while (N1[n1] == '_' && n1 > 0 && N1[n1 - 1] == '_') n1 -= 1; if (n0 == n1 && strncmp (N0, N1, n0) == 0) return (atoi (N0 + k0 + 1) < atoi (N1 + k1 + 1)); } return (strcmp (N0, N1) < 0); } } /* Sort SYMS[0..NSYMS-1] to put the choices in a canonical order by the encoded names. */ static void sort_choices (struct block_symbol syms[], int nsyms) { int i; for (i = 1; i < nsyms; i += 1) { struct block_symbol sym = syms[i]; int j; for (j = i - 1; j >= 0; j -= 1) { if (encoded_ordered_before (syms[j].symbol->linkage_name (), sym.symbol->linkage_name ())) break; syms[j + 1] = syms[j]; } syms[j + 1] = sym; } } /* Whether GDB should display formals and return types for functions in the overloads selection menu. */ static bool print_signatures = true; /* Print the signature for SYM on STREAM according to the FLAGS options. For all but functions, the signature is just the name of the symbol. For functions, this is the name of the function, the list of types for formals and the return type (if any). */ static void ada_print_symbol_signature (struct ui_file *stream, struct symbol *sym, const struct type_print_options *flags) { struct type *type = SYMBOL_TYPE (sym); fprintf_filtered (stream, "%s", sym->print_name ()); if (!print_signatures || type == NULL || TYPE_CODE (type) != TYPE_CODE_FUNC) return; if (TYPE_NFIELDS (type) > 0) { int i; fprintf_filtered (stream, " ("); for (i = 0; i < TYPE_NFIELDS (type); ++i) { if (i > 0) fprintf_filtered (stream, "; "); ada_print_type (TYPE_FIELD_TYPE (type, i), NULL, stream, -1, 0, flags); } fprintf_filtered (stream, ")"); } if (TYPE_TARGET_TYPE (type) != NULL && TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID) { fprintf_filtered (stream, " return "); ada_print_type (TYPE_TARGET_TYPE (type), NULL, stream, -1, 0, flags); } } /* Read and validate a set of numeric choices from the user in the range 0 .. N_CHOICES-1. Place the results in increasing order in CHOICES[0 .. N-1], and return N. The user types choices as a sequence of numbers on one line separated by blanks, encoding them as follows: + A choice of 0 means to cancel the selection, throwing an error. + If IS_ALL_CHOICE, a choice of 1 selects the entire set 0 .. N_CHOICES-1. + The user chooses k by typing k+IS_ALL_CHOICE+1. The user is not allowed to choose more than MAX_RESULTS values. ANNOTATION_SUFFIX, if present, is used to annotate the input prompts (for use with the -f switch). */ static int get_selections (int *choices, int n_choices, int max_results, int is_all_choice, const char *annotation_suffix) { const char *args; const char *prompt; int n_chosen; int first_choice = is_all_choice ? 2 : 1; prompt = getenv ("PS2"); if (prompt == NULL) prompt = "> "; args = command_line_input (prompt, annotation_suffix); if (args == NULL) error_no_arg (_("one or more choice numbers")); n_chosen = 0; /* Set choices[0 .. n_chosen-1] to the users' choices in ascending order, as given in args. Choices are validated. */ while (1) { char *args2; int choice, j; args = skip_spaces (args); if (*args == '\0' && n_chosen == 0) error_no_arg (_("one or more choice numbers")); else if (*args == '\0') break; choice = strtol (args, &args2, 10); if (args == args2 || choice < 0 || choice > n_choices + first_choice - 1) error (_("Argument must be choice number")); args = args2; if (choice == 0) error (_("cancelled")); if (choice < first_choice) { n_chosen = n_choices; for (j = 0; j < n_choices; j += 1) choices[j] = j; break; } choice -= first_choice; for (j = n_chosen - 1; j >= 0 && choice < choices[j]; j -= 1) { } if (j < 0 || choice != choices[j]) { int k; for (k = n_chosen - 1; k > j; k -= 1) choices[k + 1] = choices[k]; choices[j + 1] = choice; n_chosen += 1; } } if (n_chosen > max_results) error (_("Select no more than %d of the above"), max_results); return n_chosen; } /* Given a list of NSYMS symbols in SYMS, select up to MAX_RESULTS>0 by asking the user (if necessary), returning the number selected, and setting the first elements of SYMS items. Error if no symbols selected. */ /* NOTE: Adapted from decode_line_2 in symtab.c, with which it ought to be re-integrated one of these days. */ static int user_select_syms (struct block_symbol *syms, int nsyms, int max_results) { int i; int *chosen = XALLOCAVEC (int , nsyms); int n_chosen; int first_choice = (max_results == 1) ? 1 : 2; const char *select_mode = multiple_symbols_select_mode (); if (max_results < 1) error (_("Request to select 0 symbols!")); if (nsyms <= 1) return nsyms; if (select_mode == multiple_symbols_cancel) error (_("\ canceled because the command is ambiguous\n\ See set/show multiple-symbol.")); /* If select_mode is "all", then return all possible symbols. Only do that if more than one symbol can be selected, of course. Otherwise, display the menu as usual. */ if (select_mode == multiple_symbols_all && max_results > 1) return nsyms; printf_filtered (_("[0] cancel\n")); if (max_results > 1) printf_filtered (_("[1] all\n")); sort_choices (syms, nsyms); for (i = 0; i < nsyms; i += 1) { if (syms[i].symbol == NULL) continue; if (SYMBOL_CLASS (syms[i].symbol) == LOC_BLOCK) { struct symtab_and_line sal = find_function_start_sal (syms[i].symbol, 1); printf_filtered ("[%d] ", i + first_choice); ada_print_symbol_signature (gdb_stdout, syms[i].symbol, &type_print_raw_options); if (sal.symtab == NULL) printf_filtered (_(" at %p[%p]:%d\n"), metadata_style.style ().ptr (), nullptr, sal.line); else printf_filtered (_(" at %ps:%d\n"), styled_string (file_name_style.style (), symtab_to_filename_for_display (sal.symtab)), sal.line); continue; } else { int is_enumeral = (SYMBOL_CLASS (syms[i].symbol) == LOC_CONST && SYMBOL_TYPE (syms[i].symbol) != NULL && TYPE_CODE (SYMBOL_TYPE (syms[i].symbol)) == TYPE_CODE_ENUM); struct symtab *symtab = NULL; if (SYMBOL_OBJFILE_OWNED (syms[i].symbol)) symtab = symbol_symtab (syms[i].symbol); if (SYMBOL_LINE (syms[i].symbol) != 0 && symtab != NULL) { printf_filtered ("[%d] ", i + first_choice); ada_print_symbol_signature (gdb_stdout, syms[i].symbol, &type_print_raw_options); printf_filtered (_(" at %s:%d\n"), symtab_to_filename_for_display (symtab), SYMBOL_LINE (syms[i].symbol)); } else if (is_enumeral && TYPE_NAME (SYMBOL_TYPE (syms[i].symbol)) != NULL) { printf_filtered (("[%d] "), i + first_choice); ada_print_type (SYMBOL_TYPE (syms[i].symbol), NULL, gdb_stdout, -1, 0, &type_print_raw_options); printf_filtered (_("'(%s) (enumeral)\n"), syms[i].symbol->print_name ()); } else { printf_filtered ("[%d] ", i + first_choice); ada_print_symbol_signature (gdb_stdout, syms[i].symbol, &type_print_raw_options); if (symtab != NULL) printf_filtered (is_enumeral ? _(" in %s (enumeral)\n") : _(" at %s:?\n"), symtab_to_filename_for_display (symtab)); else printf_filtered (is_enumeral ? _(" (enumeral)\n") : _(" at ?\n")); } } } n_chosen = get_selections (chosen, nsyms, max_results, max_results > 1, "overload-choice"); for (i = 0; i < n_chosen; i += 1) syms[i] = syms[chosen[i]]; return n_chosen; } /* Same as evaluate_type (*EXP), but resolves ambiguous symbol references (marked by OP_VAR_VALUE nodes in which the symbol has an undefined namespace) and converts operators that are user-defined into appropriate function calls. If CONTEXT_TYPE is non-null, it provides a preferred result type [at the moment, only type void has any effect---causing procedures to be preferred over functions in calls]. A null CONTEXT_TYPE indicates that a non-void return type is preferred. May change (expand) *EXP. */ static void resolve (expression_up *expp, int void_context_p, int parse_completion, innermost_block_tracker *tracker) { struct type *context_type = NULL; int pc = 0; if (void_context_p) context_type = builtin_type ((*expp)->gdbarch)->builtin_void; resolve_subexp (expp, &pc, 1, context_type, parse_completion, tracker); } /* Resolve the operator of the subexpression beginning at position *POS of *EXPP. "Resolving" consists of replacing the symbols that have undefined namespaces in OP_VAR_VALUE nodes with their resolutions, replacing built-in operators with function calls to user-defined operators, where appropriate, and, when DEPROCEDURE_P is non-zero, converting function-valued variables into parameterless calls. May expand *EXPP. The CONTEXT_TYPE functions are as in ada_resolve, above. */ static struct value * resolve_subexp (expression_up *expp, int *pos, int deprocedure_p, struct type *context_type, int parse_completion, innermost_block_tracker *tracker) { int pc = *pos; int i; struct expression *exp; /* Convenience: == *expp. */ enum exp_opcode op = (*expp)->elts[pc].opcode; struct value **argvec; /* Vector of operand types (alloca'ed). */ int nargs; /* Number of operands. */ int oplen; argvec = NULL; nargs = 0; exp = expp->get (); /* Pass one: resolve operands, saving their types and updating *pos, if needed. */ switch (op) { case OP_FUNCALL: if (exp->elts[pc + 3].opcode == OP_VAR_VALUE && SYMBOL_DOMAIN (exp->elts[pc + 5].symbol) == UNDEF_DOMAIN) *pos += 7; else { *pos += 3; resolve_subexp (expp, pos, 0, NULL, parse_completion, tracker); } nargs = longest_to_int (exp->elts[pc + 1].longconst); break; case UNOP_ADDR: *pos += 1; resolve_subexp (expp, pos, 0, NULL, parse_completion, tracker); break; case UNOP_QUAL: *pos += 3; resolve_subexp (expp, pos, 1, check_typedef (exp->elts[pc + 1].type), parse_completion, tracker); break; case OP_ATR_MODULUS: case OP_ATR_SIZE: case OP_ATR_TAG: case OP_ATR_FIRST: case OP_ATR_LAST: case OP_ATR_LENGTH: case OP_ATR_POS: case OP_ATR_VAL: case OP_ATR_MIN: case OP_ATR_MAX: case TERNOP_IN_RANGE: case BINOP_IN_BOUNDS: case UNOP_IN_RANGE: case OP_AGGREGATE: case OP_OTHERS: case OP_CHOICES: case OP_POSITIONAL: case OP_DISCRETE_RANGE: case OP_NAME: ada_forward_operator_length (exp, pc, &oplen, &nargs); *pos += oplen; break; case BINOP_ASSIGN: { struct value *arg1; *pos += 1; arg1 = resolve_subexp (expp, pos, 0, NULL, parse_completion, tracker); if (arg1 == NULL) resolve_subexp (expp, pos, 1, NULL, parse_completion, tracker); else resolve_subexp (expp, pos, 1, value_type (arg1), parse_completion, tracker); break; } case UNOP_CAST: *pos += 3; nargs = 1; break; case BINOP_ADD: case BINOP_SUB: case BINOP_MUL: case BINOP_DIV: case BINOP_REM: case BINOP_MOD: case BINOP_EXP: case BINOP_CONCAT: case BINOP_LOGICAL_AND: case BINOP_LOGICAL_OR: case BINOP_BITWISE_AND: case BINOP_BITWISE_IOR: case BINOP_BITWISE_XOR: case BINOP_EQUAL: case BINOP_NOTEQUAL: case BINOP_LESS: case BINOP_GTR: case BINOP_LEQ: case BINOP_GEQ: case BINOP_REPEAT: case BINOP_SUBSCRIPT: case BINOP_COMMA: *pos += 1; nargs = 2; break; case UNOP_NEG: case UNOP_PLUS: case UNOP_LOGICAL_NOT: case UNOP_ABS: case UNOP_IND: *pos += 1; nargs = 1; break; case OP_LONG: case OP_FLOAT: case OP_VAR_VALUE: case OP_VAR_MSYM_VALUE: *pos += 4; break; case OP_TYPE: case OP_BOOL: case OP_LAST: case OP_INTERNALVAR: *pos += 3; break; case UNOP_MEMVAL: *pos += 3; nargs = 1; break; case OP_REGISTER: *pos += 4 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1); break; case STRUCTOP_STRUCT: *pos += 4 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1); nargs = 1; break; case TERNOP_SLICE: *pos += 1; nargs = 3; break; case OP_STRING: break; default: error (_("Unexpected operator during name resolution")); } argvec = XALLOCAVEC (struct value *, nargs + 1); for (i = 0; i < nargs; i += 1) argvec[i] = resolve_subexp (expp, pos, 1, NULL, parse_completion, tracker); argvec[i] = NULL; exp = expp->get (); /* Pass two: perform any resolution on principal operator. */ switch (op) { default: break; case OP_VAR_VALUE: if (SYMBOL_DOMAIN (exp->elts[pc + 2].symbol) == UNDEF_DOMAIN) { std::vector candidates; int n_candidates; n_candidates = ada_lookup_symbol_list (exp->elts[pc + 2].symbol->linkage_name (), exp->elts[pc + 1].block, VAR_DOMAIN, &candidates); if (n_candidates > 1) { /* Types tend to get re-introduced locally, so if there are any local symbols that are not types, first filter out all types. */ int j; for (j = 0; j < n_candidates; j += 1) switch (SYMBOL_CLASS (candidates[j].symbol)) { case LOC_REGISTER: case LOC_ARG: case LOC_REF_ARG: case LOC_REGPARM_ADDR: case LOC_LOCAL: case LOC_COMPUTED: goto FoundNonType; default: break; } FoundNonType: if (j < n_candidates) { j = 0; while (j < n_candidates) { if (SYMBOL_CLASS (candidates[j].symbol) == LOC_TYPEDEF) { candidates[j] = candidates[n_candidates - 1]; n_candidates -= 1; } else j += 1; } } } if (n_candidates == 0) error (_("No definition found for %s"), exp->elts[pc + 2].symbol->print_name ()); else if (n_candidates == 1) i = 0; else if (deprocedure_p && !is_nonfunction (candidates.data (), n_candidates)) { i = ada_resolve_function (candidates.data (), n_candidates, NULL, 0, exp->elts[pc + 2].symbol->linkage_name (), context_type, parse_completion); if (i < 0) error (_("Could not find a match for %s"), exp->elts[pc + 2].symbol->print_name ()); } else { printf_filtered (_("Multiple matches for %s\n"), exp->elts[pc + 2].symbol->print_name ()); user_select_syms (candidates.data (), n_candidates, 1); i = 0; } exp->elts[pc + 1].block = candidates[i].block; exp->elts[pc + 2].symbol = candidates[i].symbol; tracker->update (candidates[i]); } if (deprocedure_p && (TYPE_CODE (SYMBOL_TYPE (exp->elts[pc + 2].symbol)) == TYPE_CODE_FUNC)) { replace_operator_with_call (expp, pc, 0, 4, exp->elts[pc + 2].symbol, exp->elts[pc + 1].block); exp = expp->get (); } break; case OP_FUNCALL: { if (exp->elts[pc + 3].opcode == OP_VAR_VALUE && SYMBOL_DOMAIN (exp->elts[pc + 5].symbol) == UNDEF_DOMAIN) { std::vector candidates; int n_candidates; n_candidates = ada_lookup_symbol_list (exp->elts[pc + 5].symbol->linkage_name (), exp->elts[pc + 4].block, VAR_DOMAIN, &candidates); if (n_candidates == 1) i = 0; else { i = ada_resolve_function (candidates.data (), n_candidates, argvec, nargs, exp->elts[pc + 5].symbol->linkage_name (), context_type, parse_completion); if (i < 0) error (_("Could not find a match for %s"), exp->elts[pc + 5].symbol->print_name ()); } exp->elts[pc + 4].block = candidates[i].block; exp->elts[pc + 5].symbol = candidates[i].symbol; tracker->update (candidates[i]); } } break; case BINOP_ADD: case BINOP_SUB: case BINOP_MUL: case BINOP_DIV: case BINOP_REM: case BINOP_MOD: case BINOP_CONCAT: case BINOP_BITWISE_AND: case BINOP_BITWISE_IOR: case BINOP_BITWISE_XOR: case BINOP_EQUAL: case BINOP_NOTEQUAL: case BINOP_LESS: case BINOP_GTR: case BINOP_LEQ: case BINOP_GEQ: case BINOP_EXP: case UNOP_NEG: case UNOP_PLUS: case UNOP_LOGICAL_NOT: case UNOP_ABS: if (possible_user_operator_p (op, argvec)) { std::vector candidates; int n_candidates; n_candidates = ada_lookup_symbol_list (ada_decoded_op_name (op), NULL, VAR_DOMAIN, &candidates); i = ada_resolve_function (candidates.data (), n_candidates, argvec, nargs, ada_decoded_op_name (op), NULL, parse_completion); if (i < 0) break; replace_operator_with_call (expp, pc, nargs, 1, candidates[i].symbol, candidates[i].block); exp = expp->get (); } break; case OP_TYPE: case OP_REGISTER: return NULL; } *pos = pc; if (exp->elts[pc].opcode == OP_VAR_MSYM_VALUE) return evaluate_var_msym_value (EVAL_AVOID_SIDE_EFFECTS, exp->elts[pc + 1].objfile, exp->elts[pc + 2].msymbol); else return evaluate_subexp_type (exp, pos); } /* Return non-zero if formal type FTYPE matches actual type ATYPE. If MAY_DEREF is non-zero, the formal may be a pointer and the actual a non-pointer. */ /* The term "match" here is rather loose. The match is heuristic and liberal. */ static int ada_type_match (struct type *ftype, struct type *atype, int may_deref) { ftype = ada_check_typedef (ftype); atype = ada_check_typedef (atype); if (TYPE_CODE (ftype) == TYPE_CODE_REF) ftype = TYPE_TARGET_TYPE (ftype); if (TYPE_CODE (atype) == TYPE_CODE_REF) atype = TYPE_TARGET_TYPE (atype); switch (TYPE_CODE (ftype)) { default: return TYPE_CODE (ftype) == TYPE_CODE (atype); case TYPE_CODE_PTR: if (TYPE_CODE (atype) == TYPE_CODE_PTR) return ada_type_match (TYPE_TARGET_TYPE (ftype), TYPE_TARGET_TYPE (atype), 0); else return (may_deref && ada_type_match (TYPE_TARGET_TYPE (ftype), atype, 0)); case TYPE_CODE_INT: case TYPE_CODE_ENUM: case TYPE_CODE_RANGE: switch (TYPE_CODE (atype)) { case TYPE_CODE_INT: case TYPE_CODE_ENUM: case TYPE_CODE_RANGE: return 1; default: return 0; } case TYPE_CODE_ARRAY: return (TYPE_CODE (atype) == TYPE_CODE_ARRAY || ada_is_array_descriptor_type (atype)); case TYPE_CODE_STRUCT: if (ada_is_array_descriptor_type (ftype)) return (TYPE_CODE (atype) == TYPE_CODE_ARRAY || ada_is_array_descriptor_type (atype)); else return (TYPE_CODE (atype) == TYPE_CODE_STRUCT && !ada_is_array_descriptor_type (atype)); case TYPE_CODE_UNION: case TYPE_CODE_FLT: return (TYPE_CODE (atype) == TYPE_CODE (ftype)); } } /* Return non-zero if the formals of FUNC "sufficiently match" the vector of actual argument types ACTUALS of size N_ACTUALS. FUNC may also be an enumeral, in which case it is treated as a 0- argument function. */ static int ada_args_match (struct symbol *func, struct value **actuals, int n_actuals) { int i; struct type *func_type = SYMBOL_TYPE (func); if (SYMBOL_CLASS (func) == LOC_CONST && TYPE_CODE (func_type) == TYPE_CODE_ENUM) return (n_actuals == 0); else if (func_type == NULL || TYPE_CODE (func_type) != TYPE_CODE_FUNC) return 0; if (TYPE_NFIELDS (func_type) != n_actuals) return 0; for (i = 0; i < n_actuals; i += 1) { if (actuals[i] == NULL) return 0; else { struct type *ftype = ada_check_typedef (TYPE_FIELD_TYPE (func_type, i)); struct type *atype = ada_check_typedef (value_type (actuals[i])); if (!ada_type_match (ftype, atype, 1)) return 0; } } return 1; } /* False iff function type FUNC_TYPE definitely does not produce a value compatible with type CONTEXT_TYPE. Conservatively returns 1 if FUNC_TYPE is not a valid function type with a non-null return type or an enumerated type. A null CONTEXT_TYPE indicates any non-void type. */ static int return_match (struct type *func_type, struct type *context_type) { struct type *return_type; if (func_type == NULL) return 1; if (TYPE_CODE (func_type) == TYPE_CODE_FUNC) return_type = get_base_type (TYPE_TARGET_TYPE (func_type)); else return_type = get_base_type (func_type); if (return_type == NULL) return 1; context_type = get_base_type (context_type); if (TYPE_CODE (return_type) == TYPE_CODE_ENUM) return context_type == NULL || return_type == context_type; else if (context_type == NULL) return TYPE_CODE (return_type) != TYPE_CODE_VOID; else return TYPE_CODE (return_type) == TYPE_CODE (context_type); } /* Returns the index in SYMS[0..NSYMS-1] that contains the symbol for the function (if any) that matches the types of the NARGS arguments in ARGS. If CONTEXT_TYPE is non-null and there is at least one match that returns that type, then eliminate matches that don't. If CONTEXT_TYPE is void and there is at least one match that does not return void, eliminate all matches that do. Asks the user if there is more than one match remaining. Returns -1 if there is no such symbol or none is selected. NAME is used solely for messages. May re-arrange and modify SYMS in the process; the index returned is for the modified vector. */ static int ada_resolve_function (struct block_symbol syms[], int nsyms, struct value **args, int nargs, const char *name, struct type *context_type, int parse_completion) { int fallback; int k; int m; /* Number of hits */ m = 0; /* In the first pass of the loop, we only accept functions matching context_type. If none are found, we add a second pass of the loop where every function is accepted. */ for (fallback = 0; m == 0 && fallback < 2; fallback++) { for (k = 0; k < nsyms; k += 1) { struct type *type = ada_check_typedef (SYMBOL_TYPE (syms[k].symbol)); if (ada_args_match (syms[k].symbol, args, nargs) && (fallback || return_match (type, context_type))) { syms[m] = syms[k]; m += 1; } } } /* If we got multiple matches, ask the user which one to use. Don't do this interactive thing during completion, though, as the purpose of the completion is providing a list of all possible matches. Prompting the user to filter it down would be completely unexpected in this case. */ if (m == 0) return -1; else if (m > 1 && !parse_completion) { printf_filtered (_("Multiple matches for %s\n"), name); user_select_syms (syms, m, 1); return 0; } return 0; } /* Replace the operator of length OPLEN at position PC in *EXPP with a call on the function identified by SYM and BLOCK, and taking NARGS arguments. Update *EXPP as needed to hold more space. */ static void replace_operator_with_call (expression_up *expp, int pc, int nargs, int oplen, struct symbol *sym, const struct block *block) { /* A new expression, with 6 more elements (3 for funcall, 4 for function symbol, -oplen for operator being replaced). */ struct expression *newexp = (struct expression *) xzalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES ((*expp)->nelts + 7 - oplen)); struct expression *exp = expp->get (); newexp->nelts = exp->nelts + 7 - oplen; newexp->language_defn = exp->language_defn; newexp->gdbarch = exp->gdbarch; memcpy (newexp->elts, exp->elts, EXP_ELEM_TO_BYTES (pc)); memcpy (newexp->elts + pc + 7, exp->elts + pc + oplen, EXP_ELEM_TO_BYTES (exp->nelts - pc - oplen)); newexp->elts[pc].opcode = newexp->elts[pc + 2].opcode = OP_FUNCALL; newexp->elts[pc + 1].longconst = (LONGEST) nargs; newexp->elts[pc + 3].opcode = newexp->elts[pc + 6].opcode = OP_VAR_VALUE; newexp->elts[pc + 4].block = block; newexp->elts[pc + 5].symbol = sym; expp->reset (newexp); } /* Type-class predicates */ /* True iff TYPE is numeric (i.e., an INT, RANGE (of numeric type), or FLOAT). */ static int numeric_type_p (struct type *type) { if (type == NULL) return 0; else { switch (TYPE_CODE (type)) { case TYPE_CODE_INT: case TYPE_CODE_FLT: return 1; case TYPE_CODE_RANGE: return (type == TYPE_TARGET_TYPE (type) || numeric_type_p (TYPE_TARGET_TYPE (type))); default: return 0; } } } /* True iff TYPE is integral (an INT or RANGE of INTs). */ static int integer_type_p (struct type *type) { if (type == NULL) return 0; else { switch (TYPE_CODE (type)) { case TYPE_CODE_INT: return 1; case TYPE_CODE_RANGE: return (type == TYPE_TARGET_TYPE (type) || integer_type_p (TYPE_TARGET_TYPE (type))); default: return 0; } } } /* True iff TYPE is scalar (INT, RANGE, FLOAT, ENUM). */ static int scalar_type_p (struct type *type) { if (type == NULL) return 0; else { switch (TYPE_CODE (type)) { case TYPE_CODE_INT: case TYPE_CODE_RANGE: case TYPE_CODE_ENUM: case TYPE_CODE_FLT: return 1; default: return 0; } } } /* True iff TYPE is discrete (INT, RANGE, ENUM). */ static int discrete_type_p (struct type *type) { if (type == NULL) return 0; else { switch (TYPE_CODE (type)) { case TYPE_CODE_INT: case TYPE_CODE_RANGE: case TYPE_CODE_ENUM: case TYPE_CODE_BOOL: return 1; default: return 0; } } } /* Returns non-zero if OP with operands in the vector ARGS could be a user-defined function. Errs on the side of pre-defined operators (i.e., result 0). */ static int possible_user_operator_p (enum exp_opcode op, struct value *args[]) { struct type *type0 = (args[0] == NULL) ? NULL : ada_check_typedef (value_type (args[0])); struct type *type1 = (args[1] == NULL) ? NULL : ada_check_typedef (value_type (args[1])); if (type0 == NULL) return 0; switch (op) { default: return 0; case BINOP_ADD: case BINOP_SUB: case BINOP_MUL: case BINOP_DIV: return (!(numeric_type_p (type0) && numeric_type_p (type1))); case BINOP_REM: case BINOP_MOD: case BINOP_BITWISE_AND: case BINOP_BITWISE_IOR: case BINOP_BITWISE_XOR: return (!(integer_type_p (type0) && integer_type_p (type1))); case BINOP_EQUAL: case BINOP_NOTEQUAL: case BINOP_LESS: case BINOP_GTR: case BINOP_LEQ: case BINOP_GEQ: return (!(scalar_type_p (type0) && scalar_type_p (type1))); case BINOP_CONCAT: return !ada_is_array_type (type0) || !ada_is_array_type (type1); case BINOP_EXP: return (!(numeric_type_p (type0) && integer_type_p (type1))); case UNOP_NEG: case UNOP_PLUS: case UNOP_LOGICAL_NOT: case UNOP_ABS: return (!numeric_type_p (type0)); } } /* Renaming */ /* NOTES: 1. In the following, we assume that a renaming type's name may have an ___XD suffix. It would be nice if this went away at some point. 2. We handle both the (old) purely type-based representation of renamings and the (new) variable-based encoding. At some point, it is devoutly to be hoped that the former goes away (FIXME: hilfinger-2007-07-09). 3. Subprogram renamings are not implemented, although the XRS suffix is recognized (FIXME: hilfinger-2007-07-09). */ /* If SYM encodes a renaming, renames , sets *LEN to the length of the renamed entity's name, *RENAMED_ENTITY to that name (not null-terminated), and *RENAMING_EXPR to the string describing the subcomponent selected from the renamed entity. Returns ADA_NOT_RENAMING if SYM does not encode a renaming (in which case, the values of *RENAMED_ENTITY, *LEN, and *RENAMING_EXPR are undefined). Otherwise, returns a value indicating the category of entity renamed: an object (ADA_OBJECT_RENAMING), exception (ADA_EXCEPTION_RENAMING), package (ADA_PACKAGE_RENAMING), or subprogram (ADA_SUBPROGRAM_RENAMING). Does no allocation; the strings returned in *RENAMED_ENTITY and *RENAMING_EXPR should not be deallocated. The values of RENAMED_ENTITY, LEN, or RENAMING_EXPR may be NULL, in which case they are not assigned. [Currently, however, GCC does not generate subprogram renamings.] */ enum ada_renaming_category ada_parse_renaming (struct symbol *sym, const char **renamed_entity, int *len, const char **renaming_expr) { enum ada_renaming_category kind; const char *info; const char *suffix; if (sym == NULL) return ADA_NOT_RENAMING; switch (SYMBOL_CLASS (sym)) { default: return ADA_NOT_RENAMING; case LOC_LOCAL: case LOC_STATIC: case LOC_COMPUTED: case LOC_OPTIMIZED_OUT: info = strstr (sym->linkage_name (), "___XR"); if (info == NULL) return ADA_NOT_RENAMING; switch (info[5]) { case '_': kind = ADA_OBJECT_RENAMING; info += 6; break; case 'E': kind = ADA_EXCEPTION_RENAMING; info += 7; break; case 'P': kind = ADA_PACKAGE_RENAMING; info += 7; break; case 'S': kind = ADA_SUBPROGRAM_RENAMING; info += 7; break; default: return ADA_NOT_RENAMING; } } if (renamed_entity != NULL) *renamed_entity = info; suffix = strstr (info, "___XE"); if (suffix == NULL || suffix == info) return ADA_NOT_RENAMING; if (len != NULL) *len = strlen (info) - strlen (suffix); suffix += 5; if (renaming_expr != NULL) *renaming_expr = suffix; return kind; } /* Compute the value of the given RENAMING_SYM, which is expected to be a symbol encoding a renaming expression. BLOCK is the block used to evaluate the renaming. */ static struct value * ada_read_renaming_var_value (struct symbol *renaming_sym, const struct block *block) { const char *sym_name; sym_name = renaming_sym->linkage_name (); expression_up expr = parse_exp_1 (&sym_name, 0, block, 0); return evaluate_expression (expr.get ()); } /* Evaluation: Function Calls */ /* Return an lvalue containing the value VAL. This is the identity on lvalues, and otherwise has the side-effect of allocating memory in the inferior where a copy of the value contents is copied. */ static struct value * ensure_lval (struct value *val) { if (VALUE_LVAL (val) == not_lval || VALUE_LVAL (val) == lval_internalvar) { int len = TYPE_LENGTH (ada_check_typedef (value_type (val))); const CORE_ADDR addr = value_as_long (value_allocate_space_in_inferior (len)); VALUE_LVAL (val) = lval_memory; set_value_address (val, addr); write_memory (addr, value_contents (val), len); } return val; } /* Given ARG, a value of type (pointer or reference to a)* structure/union, extract the component named NAME from the ultimate target structure/union and return it as a value with its appropriate type. The routine searches for NAME among all members of the structure itself and (recursively) among all members of any wrapper members (e.g., '_parent'). If NO_ERR, then simply return NULL in case of error, rather than calling error. */ static struct value * ada_value_struct_elt (struct value *arg, const char *name, int no_err) { struct type *t, *t1; struct value *v; int check_tag; v = NULL; t1 = t = ada_check_typedef (value_type (arg)); if (TYPE_CODE (t) == TYPE_CODE_REF) { t1 = TYPE_TARGET_TYPE (t); if (t1 == NULL) goto BadValue; t1 = ada_check_typedef (t1); if (TYPE_CODE (t1) == TYPE_CODE_PTR) { arg = coerce_ref (arg); t = t1; } } while (TYPE_CODE (t) == TYPE_CODE_PTR) { t1 = TYPE_TARGET_TYPE (t); if (t1 == NULL) goto BadValue; t1 = ada_check_typedef (t1); if (TYPE_CODE (t1) == TYPE_CODE_PTR) { arg = value_ind (arg); t = t1; } else break; } if (TYPE_CODE (t1) != TYPE_CODE_STRUCT && TYPE_CODE (t1) != TYPE_CODE_UNION) goto BadValue; if (t1 == t) v = ada_search_struct_field (name, arg, 0, t); else { int bit_offset, bit_size, byte_offset; struct type *field_type; CORE_ADDR address; if (TYPE_CODE (t) == TYPE_CODE_PTR) address = value_address (ada_value_ind (arg)); else address = value_address (ada_coerce_ref (arg)); /* Check to see if this is a tagged type. We also need to handle the case where the type is a reference to a tagged type, but we have to be careful to exclude pointers to tagged types. The latter should be shown as usual (as a pointer), whereas a reference should mostly be transparent to the user. */ if (ada_is_tagged_type (t1, 0) || (TYPE_CODE (t1) == TYPE_CODE_REF && ada_is_tagged_type (TYPE_TARGET_TYPE (t1), 0))) { /* We first try to find the searched field in the current type. If not found then let's look in the fixed type. */ if (!find_struct_field (name, t1, 0, &field_type, &byte_offset, &bit_offset, &bit_size, NULL)) check_tag = 1; else check_tag = 0; } else check_tag = 0; /* Convert to fixed type in all cases, so that we have proper offsets to each field in unconstrained record types. */ t1 = ada_to_fixed_type (ada_get_base_type (t1), NULL, address, NULL, check_tag); if (find_struct_field (name, t1, 0, &field_type, &byte_offset, &bit_offset, &bit_size, NULL)) { if (bit_size != 0) { if (TYPE_CODE (t) == TYPE_CODE_REF) arg = ada_coerce_ref (arg); else arg = ada_value_ind (arg); v = ada_value_primitive_packed_val (arg, NULL, byte_offset, bit_offset, bit_size, field_type); } else v = value_at_lazy (field_type, address + byte_offset); } } if (v != NULL || no_err) return v; else error (_("There is no member named %s."), name); BadValue: if (no_err) return NULL; else error (_("Attempt to extract a component of " "a value that is not a record.")); } /* Return the value ACTUAL, converted to be an appropriate value for a formal of type FORMAL_TYPE. Use *SP as a stack pointer for allocating any necessary descriptors (fat pointers), or copies of values not residing in memory, updating it as needed. */ struct value * ada_convert_actual (struct value *actual, struct type *formal_type0) { struct type *actual_type = ada_check_typedef (value_type (actual)); struct type *formal_type = ada_check_typedef (formal_type0); struct type *formal_target = TYPE_CODE (formal_type) == TYPE_CODE_PTR ? ada_check_typedef (TYPE_TARGET_TYPE (formal_type)) : formal_type; struct type *actual_target = TYPE_CODE (actual_type) == TYPE_CODE_PTR ? ada_check_typedef (TYPE_TARGET_TYPE (actual_type)) : actual_type; if (ada_is_array_descriptor_type (formal_target) && TYPE_CODE (actual_target) == TYPE_CODE_ARRAY) return make_array_descriptor (formal_type, actual); else if (TYPE_CODE (formal_type) == TYPE_CODE_PTR || TYPE_CODE (formal_type) == TYPE_CODE_REF) { struct value *result; if (TYPE_CODE (formal_target) == TYPE_CODE_ARRAY && ada_is_array_descriptor_type (actual_target)) result = desc_data (actual); else if (TYPE_CODE (formal_type) != TYPE_CODE_PTR) { if (VALUE_LVAL (actual) != lval_memory) { struct value *val; actual_type = ada_check_typedef (value_type (actual)); val = allocate_value (actual_type); memcpy ((char *) value_contents_raw (val), (char *) value_contents (actual), TYPE_LENGTH (actual_type)); actual = ensure_lval (val); } result = value_addr (actual); } else return actual; return value_cast_pointers (formal_type, result, 0); } else if (TYPE_CODE (actual_type) == TYPE_CODE_PTR) return ada_value_ind (actual); else if (ada_is_aligner_type (formal_type)) { /* We need to turn this parameter into an aligner type as well. */ struct value *aligner = allocate_value (formal_type); struct value *component = ada_value_struct_elt (aligner, "F", 0); value_assign_to_component (aligner, component, actual); return aligner; } return actual; } /* Convert VALUE (which must be an address) to a CORE_ADDR that is a pointer of type TYPE. This is usually an inefficient no-op except on some targets (such as AVR) where the representation of a pointer and an address differs. */ static CORE_ADDR value_pointer (struct value *value, struct type *type) { struct gdbarch *gdbarch = get_type_arch (type); unsigned len = TYPE_LENGTH (type); gdb_byte *buf = (gdb_byte *) alloca (len); CORE_ADDR addr; addr = value_address (value); gdbarch_address_to_pointer (gdbarch, type, buf, addr); addr = extract_unsigned_integer (buf, len, type_byte_order (type)); return addr; } /* Push a descriptor of type TYPE for array value ARR on the stack at *SP, updating *SP to reflect the new descriptor. Return either an lvalue representing the new descriptor, or (if TYPE is a pointer- to-descriptor type rather than a descriptor type), a struct value * representing a pointer to this descriptor. */ static struct value * make_array_descriptor (struct type *type, struct value *arr) { struct type *bounds_type = desc_bounds_type (type); struct type *desc_type = desc_base_type (type); struct value *descriptor = allocate_value (desc_type); struct value *bounds = allocate_value (bounds_type); int i; for (i = ada_array_arity (ada_check_typedef (value_type (arr))); i > 0; i -= 1) { modify_field (value_type (bounds), value_contents_writeable (bounds), ada_array_bound (arr, i, 0), desc_bound_bitpos (bounds_type, i, 0), desc_bound_bitsize (bounds_type, i, 0)); modify_field (value_type (bounds), value_contents_writeable (bounds), ada_array_bound (arr, i, 1), desc_bound_bitpos (bounds_type, i, 1), desc_bound_bitsize (bounds_type, i, 1)); } bounds = ensure_lval (bounds); modify_field (value_type (descriptor), value_contents_writeable (descriptor), value_pointer (ensure_lval (arr), TYPE_FIELD_TYPE (desc_type, 0)), fat_pntr_data_bitpos (desc_type), fat_pntr_data_bitsize (desc_type)); modify_field (value_type (descriptor), value_contents_writeable (descriptor), value_pointer (bounds, TYPE_FIELD_TYPE (desc_type, 1)), fat_pntr_bounds_bitpos (desc_type), fat_pntr_bounds_bitsize (desc_type)); descriptor = ensure_lval (descriptor); if (TYPE_CODE (type) == TYPE_CODE_PTR) return value_addr (descriptor); else return descriptor; } /* Symbol Cache Module */ /* Performance measurements made as of 2010-01-15 indicate that this cache does bring some noticeable improvements. Depending on the type of entity being printed, the cache can make it as much as an order of magnitude faster than without it. The descriptive type DWARF extension has significantly reduced the need for this cache, at least when DWARF is being used. However, even in this case, some expensive name-based symbol searches are still sometimes necessary - to find an XVZ variable, mostly. */ /* Initialize the contents of SYM_CACHE. */ static void ada_init_symbol_cache (struct ada_symbol_cache *sym_cache) { obstack_init (&sym_cache->cache_space); memset (sym_cache->root, '\000', sizeof (sym_cache->root)); } /* Free the memory used by SYM_CACHE. */ static void ada_free_symbol_cache (struct ada_symbol_cache *sym_cache) { obstack_free (&sym_cache->cache_space, NULL); xfree (sym_cache); } /* Return the symbol cache associated to the given program space PSPACE. If not allocated for this PSPACE yet, allocate and initialize one. */ static struct ada_symbol_cache * ada_get_symbol_cache (struct program_space *pspace) { struct ada_pspace_data *pspace_data = get_ada_pspace_data (pspace); if (pspace_data->sym_cache == NULL) { pspace_data->sym_cache = XCNEW (struct ada_symbol_cache); ada_init_symbol_cache (pspace_data->sym_cache); } return pspace_data->sym_cache; } /* Clear all entries from the symbol cache. */ static void ada_clear_symbol_cache (void) { struct ada_symbol_cache *sym_cache = ada_get_symbol_cache (current_program_space); obstack_free (&sym_cache->cache_space, NULL); ada_init_symbol_cache (sym_cache); } /* Search our cache for an entry matching NAME and DOMAIN. Return it if found, or NULL otherwise. */ static struct cache_entry ** find_entry (const char *name, domain_enum domain) { struct ada_symbol_cache *sym_cache = ada_get_symbol_cache (current_program_space); int h = msymbol_hash (name) % HASH_SIZE; struct cache_entry **e; for (e = &sym_cache->root[h]; *e != NULL; e = &(*e)->next) { if (domain == (*e)->domain && strcmp (name, (*e)->name) == 0) return e; } return NULL; } /* Search the symbol cache for an entry matching NAME and DOMAIN. Return 1 if found, 0 otherwise. If an entry was found and SYM is not NULL, set *SYM to the entry's SYM. Same principle for BLOCK if not NULL. */ static int lookup_cached_symbol (const char *name, domain_enum domain, struct symbol **sym, const struct block **block) { struct cache_entry **e = find_entry (name, domain); if (e == NULL) return 0; if (sym != NULL) *sym = (*e)->sym; if (block != NULL) *block = (*e)->block; return 1; } /* Assuming that (SYM, BLOCK) is the result of the lookup of NAME in domain DOMAIN, save this result in our symbol cache. */ static void cache_symbol (const char *name, domain_enum domain, struct symbol *sym, const struct block *block) { struct ada_symbol_cache *sym_cache = ada_get_symbol_cache (current_program_space); int h; char *copy; struct cache_entry *e; /* Symbols for builtin types don't have a block. For now don't cache such symbols. */ if (sym != NULL && !SYMBOL_OBJFILE_OWNED (sym)) return; /* If the symbol is a local symbol, then do not cache it, as a search for that symbol depends on the context. To determine whether the symbol is local or not, we check the block where we found it against the global and static blocks of its associated symtab. */ if (sym && BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (symbol_symtab (sym)), GLOBAL_BLOCK) != block && BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (symbol_symtab (sym)), STATIC_BLOCK) != block) return; h = msymbol_hash (name) % HASH_SIZE; e = XOBNEW (&sym_cache->cache_space, cache_entry); e->next = sym_cache->root[h]; sym_cache->root[h] = e; e->name = copy = (char *) obstack_alloc (&sym_cache->cache_space, strlen (name) + 1); strcpy (copy, name); e->sym = sym; e->domain = domain; e->block = block; } /* Symbol Lookup */ /* Return the symbol name match type that should be used used when searching for all symbols matching LOOKUP_NAME. LOOKUP_NAME is expected to be a symbol name after transformation for Ada lookups. */ static symbol_name_match_type name_match_type_from_name (const char *lookup_name) { return (strstr (lookup_name, "__") == NULL ? symbol_name_match_type::WILD : symbol_name_match_type::FULL); } /* Return the result of a standard (literal, C-like) lookup of NAME in given DOMAIN, visible from lexical block BLOCK. */ static struct symbol * standard_lookup (const char *name, const struct block *block, domain_enum domain) { /* Initialize it just to avoid a GCC false warning. */ struct block_symbol sym = {}; if (lookup_cached_symbol (name, domain, &sym.symbol, NULL)) return sym.symbol; ada_lookup_encoded_symbol (name, block, domain, &sym); cache_symbol (name, domain, sym.symbol, sym.block); return sym.symbol; } /* Non-zero iff there is at least one non-function/non-enumeral symbol in the symbol fields of SYMS[0..N-1]. We treat enumerals as functions, since they contend in overloading in the same way. */ static int is_nonfunction (struct block_symbol syms[], int n) { int i; for (i = 0; i < n; i += 1) if (TYPE_CODE (SYMBOL_TYPE (syms[i].symbol)) != TYPE_CODE_FUNC && (TYPE_CODE (SYMBOL_TYPE (syms[i].symbol)) != TYPE_CODE_ENUM || SYMBOL_CLASS (syms[i].symbol) != LOC_CONST)) return 1; return 0; } /* If true (non-zero), then TYPE0 and TYPE1 represent equivalent struct types. Otherwise, they may not. */ static int equiv_types (struct type *type0, struct type *type1) { if (type0 == type1) return 1; if (type0 == NULL || type1 == NULL || TYPE_CODE (type0) != TYPE_CODE (type1)) return 0; if ((TYPE_CODE (type0) == TYPE_CODE_STRUCT || TYPE_CODE (type0) == TYPE_CODE_ENUM) && ada_type_name (type0) != NULL && ada_type_name (type1) != NULL && strcmp (ada_type_name (type0), ada_type_name (type1)) == 0) return 1; return 0; } /* True iff SYM0 represents the same entity as SYM1, or one that is no more defined than that of SYM1. */ static int lesseq_defined_than (struct symbol *sym0, struct symbol *sym1) { if (sym0 == sym1) return 1; if (SYMBOL_DOMAIN (sym0) != SYMBOL_DOMAIN (sym1) || SYMBOL_CLASS (sym0) != SYMBOL_CLASS (sym1)) return 0; switch (SYMBOL_CLASS (sym0)) { case LOC_UNDEF: return 1; case LOC_TYPEDEF: { struct type *type0 = SYMBOL_TYPE (sym0); struct type *type1 = SYMBOL_TYPE (sym1); const char *name0 = sym0->linkage_name (); const char *name1 = sym1->linkage_name (); int len0 = strlen (name0); return TYPE_CODE (type0) == TYPE_CODE (type1) && (equiv_types (type0, type1) || (len0 < strlen (name1) && strncmp (name0, name1, len0) == 0 && startswith (name1 + len0, "___XV"))); } case LOC_CONST: return SYMBOL_VALUE (sym0) == SYMBOL_VALUE (sym1) && equiv_types (SYMBOL_TYPE (sym0), SYMBOL_TYPE (sym1)); case LOC_STATIC: { const char *name0 = sym0->linkage_name (); const char *name1 = sym1->linkage_name (); return (strcmp (name0, name1) == 0 && SYMBOL_VALUE_ADDRESS (sym0) == SYMBOL_VALUE_ADDRESS (sym1)); } default: return 0; } } /* Append (SYM,BLOCK,SYMTAB) to the end of the array of struct block_symbol records in OBSTACKP. Do nothing if SYM is a duplicate. */ static void add_defn_to_vec (struct obstack *obstackp, struct symbol *sym, const struct block *block) { int i; struct block_symbol *prevDefns = defns_collected (obstackp, 0); /* Do not try to complete stub types, as the debugger is probably already scanning all symbols matching a certain name at the time when this function is called. Trying to replace the stub type by its associated full type will cause us to restart a scan which may lead to an infinite recursion. Instead, the client collecting the matching symbols will end up collecting several matches, with at least one of them complete. It can then filter out the stub ones if needed. */ for (i = num_defns_collected (obstackp) - 1; i >= 0; i -= 1) { if (lesseq_defined_than (sym, prevDefns[i].symbol)) return; else if (lesseq_defined_than (prevDefns[i].symbol, sym)) { prevDefns[i].symbol = sym; prevDefns[i].block = block; return; } } { struct block_symbol info; info.symbol = sym; info.block = block; obstack_grow (obstackp, &info, sizeof (struct block_symbol)); } } /* Number of block_symbol structures currently collected in current vector in OBSTACKP. */ static int num_defns_collected (struct obstack *obstackp) { return obstack_object_size (obstackp) / sizeof (struct block_symbol); } /* Vector of block_symbol structures currently collected in current vector in OBSTACKP. If FINISH, close off the vector and return its final address. */ static struct block_symbol * defns_collected (struct obstack *obstackp, int finish) { if (finish) return (struct block_symbol *) obstack_finish (obstackp); else return (struct block_symbol *) obstack_base (obstackp); } /* Return a bound minimal symbol matching NAME according to Ada decoding rules. Returns an invalid symbol if there is no such minimal symbol. Names prefixed with "standard__" are handled specially: "standard__" is first stripped off, and only static and global symbols are searched. */ struct bound_minimal_symbol ada_lookup_simple_minsym (const char *name) { struct bound_minimal_symbol result; memset (&result, 0, sizeof (result)); symbol_name_match_type match_type = name_match_type_from_name (name); lookup_name_info lookup_name (name, match_type); symbol_name_matcher_ftype *match_name = ada_get_symbol_name_matcher (lookup_name); for (objfile *objfile : current_program_space->objfiles ()) { for (minimal_symbol *msymbol : objfile->msymbols ()) { if (match_name (msymbol->linkage_name (), lookup_name, NULL) && MSYMBOL_TYPE (msymbol) != mst_solib_trampoline) { result.minsym = msymbol; result.objfile = objfile; break; } } } return result; } /* For all subprograms that statically enclose the subprogram of the selected frame, add symbols matching identifier NAME in DOMAIN and their blocks to the list of data in OBSTACKP, as for ada_add_block_symbols (q.v.). If WILD_MATCH_P, treat as NAME with a wildcard prefix. */ static void add_symbols_from_enclosing_procs (struct obstack *obstackp, const lookup_name_info &lookup_name, domain_enum domain) { } /* True if TYPE is definitely an artificial type supplied to a symbol for which no debugging information was given in the symbol file. */ static int is_nondebugging_type (struct type *type) { const char *name = ada_type_name (type); return (name != NULL && strcmp (name, "") == 0); } /* Return nonzero if TYPE1 and TYPE2 are two enumeration types that are deemed "identical" for practical purposes. This function assumes that TYPE1 and TYPE2 are both TYPE_CODE_ENUM types and that their number of enumerals is identical (in other words, TYPE_NFIELDS (type1) == TYPE_NFIELDS (type2)). */ static int ada_identical_enum_types_p (struct type *type1, struct type *type2) { int i; /* The heuristic we use here is fairly conservative. We consider that 2 enumerate types are identical if they have the same number of enumerals and that all enumerals have the same underlying value and name. */ /* All enums in the type should have an identical underlying value. */ for (i = 0; i < TYPE_NFIELDS (type1); i++) if (TYPE_FIELD_ENUMVAL (type1, i) != TYPE_FIELD_ENUMVAL (type2, i)) return 0; /* All enumerals should also have the same name (modulo any numerical suffix). */ for (i = 0; i < TYPE_NFIELDS (type1); i++) { const char *name_1 = TYPE_FIELD_NAME (type1, i); const char *name_2 = TYPE_FIELD_NAME (type2, i); int len_1 = strlen (name_1); int len_2 = strlen (name_2); ada_remove_trailing_digits (TYPE_FIELD_NAME (type1, i), &len_1); ada_remove_trailing_digits (TYPE_FIELD_NAME (type2, i), &len_2); if (len_1 != len_2 || strncmp (TYPE_FIELD_NAME (type1, i), TYPE_FIELD_NAME (type2, i), len_1) != 0) return 0; } return 1; } /* Return nonzero if all the symbols in SYMS are all enumeral symbols that are deemed "identical" for practical purposes. Sometimes, enumerals are not strictly identical, but their types are so similar that they can be considered identical. For instance, consider the following code: type Color is (Black, Red, Green, Blue, White); type RGB_Color is new Color range Red .. Blue; Type RGB_Color is a subrange of an implicit type which is a copy of type Color. If we call that implicit type RGB_ColorB ("B" is for "Base Type"), then type RGB_ColorB is a copy of type Color. As a result, when an expression references any of the enumeral by name (Eg. "print green"), the expression is technically ambiguous and the user should be asked to disambiguate. But doing so would only hinder the user, since it wouldn't matter what choice he makes, the outcome would always be the same. So, for practical purposes, we consider them as the same. */ static int symbols_are_identical_enums (const std::vector &syms) { int i; /* Before performing a thorough comparison check of each type, we perform a series of inexpensive checks. We expect that these checks will quickly fail in the vast majority of cases, and thus help prevent the unnecessary use of a more expensive comparison. Said comparison also expects us to make some of these checks (see ada_identical_enum_types_p). */ /* Quick check: All symbols should have an enum type. */ for (i = 0; i < syms.size (); i++) if (TYPE_CODE (SYMBOL_TYPE (syms[i].symbol)) != TYPE_CODE_ENUM) return 0; /* Quick check: They should all have the same value. */ for (i = 1; i < syms.size (); i++) if (SYMBOL_VALUE (syms[i].symbol) != SYMBOL_VALUE (syms[0].symbol)) return 0; /* Quick check: They should all have the same number of enumerals. */ for (i = 1; i < syms.size (); i++) if (TYPE_NFIELDS (SYMBOL_TYPE (syms[i].symbol)) != TYPE_NFIELDS (SYMBOL_TYPE (syms[0].symbol))) return 0; /* All the sanity checks passed, so we might have a set of identical enumeration types. Perform a more complete comparison of the type of each symbol. */ for (i = 1; i < syms.size (); i++) if (!ada_identical_enum_types_p (SYMBOL_TYPE (syms[i].symbol), SYMBOL_TYPE (syms[0].symbol))) return 0; return 1; } /* Remove any non-debugging symbols in SYMS that definitely duplicate other symbols in the list (The only case I know of where this happens is when object files containing stabs-in-ecoff are linked with files containing ordinary ecoff debugging symbols (or no debugging symbols)). Modifies SYMS to squeeze out deleted entries. Returns the number of items in the modified list. */ static int remove_extra_symbols (std::vector *syms) { int i, j; /* We should never be called with less than 2 symbols, as there cannot be any extra symbol in that case. But it's easy to handle, since we have nothing to do in that case. */ if (syms->size () < 2) return syms->size (); i = 0; while (i < syms->size ()) { int remove_p = 0; /* If two symbols have the same name and one of them is a stub type, the get rid of the stub. */ if (TYPE_STUB (SYMBOL_TYPE ((*syms)[i].symbol)) && (*syms)[i].symbol->linkage_name () != NULL) { for (j = 0; j < syms->size (); j++) { if (j != i && !TYPE_STUB (SYMBOL_TYPE ((*syms)[j].symbol)) && (*syms)[j].symbol->linkage_name () != NULL && strcmp ((*syms)[i].symbol->linkage_name (), (*syms)[j].symbol->linkage_name ()) == 0) remove_p = 1; } } /* Two symbols with the same name, same class and same address should be identical. */ else if ((*syms)[i].symbol->linkage_name () != NULL && SYMBOL_CLASS ((*syms)[i].symbol) == LOC_STATIC && is_nondebugging_type (SYMBOL_TYPE ((*syms)[i].symbol))) { for (j = 0; j < syms->size (); j += 1) { if (i != j && (*syms)[j].symbol->linkage_name () != NULL && strcmp ((*syms)[i].symbol->linkage_name (), (*syms)[j].symbol->linkage_name ()) == 0 && SYMBOL_CLASS ((*syms)[i].symbol) == SYMBOL_CLASS ((*syms)[j].symbol) && SYMBOL_VALUE_ADDRESS ((*syms)[i].symbol) == SYMBOL_VALUE_ADDRESS ((*syms)[j].symbol)) remove_p = 1; } } if (remove_p) syms->erase (syms->begin () + i); i += 1; } /* If all the remaining symbols are identical enumerals, then just keep the first one and discard the rest. Unlike what we did previously, we do not discard any entry unless they are ALL identical. This is because the symbol comparison is not a strict comparison, but rather a practical comparison. If all symbols are considered identical, then we can just go ahead and use the first one and discard the rest. But if we cannot reduce the list to a single element, we have to ask the user to disambiguate anyways. And if we have to present a multiple-choice menu, it's less confusing if the list isn't missing some choices that were identical and yet distinct. */ if (symbols_are_identical_enums (*syms)) syms->resize (1); return syms->size (); } /* Given a type that corresponds to a renaming entity, use the type name to extract the scope (package name or function name, fully qualified, and following the GNAT encoding convention) where this renaming has been defined. */ static std::string xget_renaming_scope (struct type *renaming_type) { /* The renaming types adhere to the following convention: _____. So, to extract the scope, we search for the "___XR" extension, and then backtrack until we find the first "__". */ const char *name = TYPE_NAME (renaming_type); const char *suffix = strstr (name, "___XR"); const char *last; /* Now, backtrack a bit until we find the first "__". Start looking at suffix - 3, as the part is at least one character long. */ for (last = suffix - 3; last > name; last--) if (last[0] == '_' && last[1] == '_') break; /* Make a copy of scope and return it. */ return std::string (name, last); } /* Return nonzero if NAME corresponds to a package name. */ static int is_package_name (const char *name) { /* Here, We take advantage of the fact that no symbols are generated for packages, while symbols are generated for each function. So the condition for NAME represent a package becomes equivalent to NAME not existing in our list of symbols. There is only one small complication with library-level functions (see below). */ /* If it is a function that has not been defined at library level, then we should be able to look it up in the symbols. */ if (standard_lookup (name, NULL, VAR_DOMAIN) != NULL) return 0; /* Library-level function names start with "_ada_". See if function "_ada_" followed by NAME can be found. */ /* Do a quick check that NAME does not contain "__", since library-level functions names cannot contain "__" in them. */ if (strstr (name, "__") != NULL) return 0; std::string fun_name = string_printf ("_ada_%s", name); return (standard_lookup (fun_name.c_str (), NULL, VAR_DOMAIN) == NULL); } /* Return nonzero if SYM corresponds to a renaming entity that is not visible from FUNCTION_NAME. */ static int old_renaming_is_invisible (const struct symbol *sym, const char *function_name) { if (SYMBOL_CLASS (sym) != LOC_TYPEDEF) return 0; std::string scope = xget_renaming_scope (SYMBOL_TYPE (sym)); /* If the rename has been defined in a package, then it is visible. */ if (is_package_name (scope.c_str ())) return 0; /* Check that the rename is in the current function scope by checking that its name starts with SCOPE. */ /* If the function name starts with "_ada_", it means that it is a library-level function. Strip this prefix before doing the comparison, as the encoding for the renaming does not contain this prefix. */ if (startswith (function_name, "_ada_")) function_name += 5; return !startswith (function_name, scope.c_str ()); } /* Remove entries from SYMS that corresponds to a renaming entity that is not visible from the function associated with CURRENT_BLOCK or that is superfluous due to the presence of more specific renaming information. Places surviving symbols in the initial entries of SYMS and returns the number of surviving symbols. Rationale: First, in cases where an object renaming is implemented as a reference variable, GNAT may produce both the actual reference variable and the renaming encoding. In this case, we discard the latter. Second, GNAT emits a type following a specified encoding for each renaming entity. Unfortunately, STABS currently does not support the definition of types that are local to a given lexical block, so all renamings types are emitted at library level. As a consequence, if an application contains two renaming entities using the same name, and a user tries to print the value of one of these entities, the result of the ada symbol lookup will also contain the wrong renaming type. This function partially covers for this limitation by attempting to remove from the SYMS list renaming symbols that should be visible from CURRENT_BLOCK. However, there does not seem be a 100% reliable method with the current information available. The implementation below has a couple of limitations (FIXME: brobecker-2003-05-12): - When the user tries to print a rename in a function while there is another rename entity defined in a package: Normally, the rename in the function has precedence over the rename in the package, so the latter should be removed from the list. This is currently not the case. - This function will incorrectly remove valid renames if the CURRENT_BLOCK corresponds to a function which symbol name has been changed by an "Export" pragma. As a consequence, the user will be unable to print such rename entities. */ static int remove_irrelevant_renamings (std::vector *syms, const struct block *current_block) { struct symbol *current_function; const char *current_function_name; int i; int is_new_style_renaming; /* If there is both a renaming foo___XR... encoded as a variable and a simple variable foo in the same block, discard the latter. First, zero out such symbols, then compress. */ is_new_style_renaming = 0; for (i = 0; i < syms->size (); i += 1) { struct symbol *sym = (*syms)[i].symbol; const struct block *block = (*syms)[i].block; const char *name; const char *suffix; if (sym == NULL || SYMBOL_CLASS (sym) == LOC_TYPEDEF) continue; name = sym->linkage_name (); suffix = strstr (name, "___XR"); if (suffix != NULL) { int name_len = suffix - name; int j; is_new_style_renaming = 1; for (j = 0; j < syms->size (); j += 1) if (i != j && (*syms)[j].symbol != NULL && strncmp (name, (*syms)[j].symbol->linkage_name (), name_len) == 0 && block == (*syms)[j].block) (*syms)[j].symbol = NULL; } } if (is_new_style_renaming) { int j, k; for (j = k = 0; j < syms->size (); j += 1) if ((*syms)[j].symbol != NULL) { (*syms)[k] = (*syms)[j]; k += 1; } return k; } /* Extract the function name associated to CURRENT_BLOCK. Abort if unable to do so. */ if (current_block == NULL) return syms->size (); current_function = block_linkage_function (current_block); if (current_function == NULL) return syms->size (); current_function_name = current_function->linkage_name (); if (current_function_name == NULL) return syms->size (); /* Check each of the symbols, and remove it from the list if it is a type corresponding to a renaming that is out of the scope of the current block. */ i = 0; while (i < syms->size ()) { if (ada_parse_renaming ((*syms)[i].symbol, NULL, NULL, NULL) == ADA_OBJECT_RENAMING && old_renaming_is_invisible ((*syms)[i].symbol, current_function_name)) syms->erase (syms->begin () + i); else i += 1; } return syms->size (); } /* Add to OBSTACKP all symbols from BLOCK (and its super-blocks) whose name and domain match NAME and DOMAIN respectively. If no match was found, then extend the search to "enclosing" routines (in other words, if we're inside a nested function, search the symbols defined inside the enclosing functions). If WILD_MATCH_P is nonzero, perform the naming matching in "wild" mode (see function "wild_match" for more info). Note: This function assumes that OBSTACKP has 0 (zero) element in it. */ static void ada_add_local_symbols (struct obstack *obstackp, const lookup_name_info &lookup_name, const struct block *block, domain_enum domain) { int block_depth = 0; while (block != NULL) { block_depth += 1; ada_add_block_symbols (obstackp, block, lookup_name, domain, NULL); /* If we found a non-function match, assume that's the one. */ if (is_nonfunction (defns_collected (obstackp, 0), num_defns_collected (obstackp))) return; block = BLOCK_SUPERBLOCK (block); } /* If no luck so far, try to find NAME as a local symbol in some lexically enclosing subprogram. */ if (num_defns_collected (obstackp) == 0 && block_depth > 2) add_symbols_from_enclosing_procs (obstackp, lookup_name, domain); } /* An object of this type is used as the user_data argument when calling the map_matching_symbols method. */ struct match_data { struct objfile *objfile; struct obstack *obstackp; struct symbol *arg_sym; int found_sym; }; /* A callback for add_nonlocal_symbols that adds symbol, found in BSYM, to a list of symbols. DATA is a pointer to a struct match_data * containing the obstack that collects the symbol list, the file that SYM must come from, a flag indicating whether a non-argument symbol has been found in the current block, and the last argument symbol passed in SYM within the current block (if any). When SYM is null, marking the end of a block, the argument symbol is added if no other has been found. */ static bool aux_add_nonlocal_symbols (struct block_symbol *bsym, struct match_data *data) { const struct block *block = bsym->block; struct symbol *sym = bsym->symbol; if (sym == NULL) { if (!data->found_sym && data->arg_sym != NULL) add_defn_to_vec (data->obstackp, fixup_symbol_section (data->arg_sym, data->objfile), block); data->found_sym = 0; data->arg_sym = NULL; } else { if (SYMBOL_CLASS (sym) == LOC_UNRESOLVED) return true; else if (SYMBOL_IS_ARGUMENT (sym)) data->arg_sym = sym; else { data->found_sym = 1; add_defn_to_vec (data->obstackp, fixup_symbol_section (sym, data->objfile), block); } } return true; } /* Helper for add_nonlocal_symbols. Find symbols in DOMAIN which are targeted by renamings matching LOOKUP_NAME in BLOCK. Add these symbols to OBSTACKP. Return whether we found such symbols. */ static int ada_add_block_renamings (struct obstack *obstackp, const struct block *block, const lookup_name_info &lookup_name, domain_enum domain) { struct using_direct *renaming; int defns_mark = num_defns_collected (obstackp); symbol_name_matcher_ftype *name_match = ada_get_symbol_name_matcher (lookup_name); for (renaming = block_using (block); renaming != NULL; renaming = renaming->next) { const char *r_name; /* Avoid infinite recursions: skip this renaming if we are actually already traversing it. Currently, symbol lookup in Ada don't use the namespace machinery from C++/Fortran support: skip namespace imports that use them. */ if (renaming->searched || (renaming->import_src != NULL && renaming->import_src[0] != '\0') || (renaming->import_dest != NULL && renaming->import_dest[0] != '\0')) continue; renaming->searched = 1; /* TODO: here, we perform another name-based symbol lookup, which can pull its own multiple overloads. In theory, we should be able to do better in this case since, in DWARF, DW_AT_import is a DIE reference, not a simple name. But in order to do this, we would need to enhance the DWARF reader to associate a symbol to this renaming, instead of a name. So, for now, we do something simpler: re-use the C++/Fortran namespace machinery. */ r_name = (renaming->alias != NULL ? renaming->alias : renaming->declaration); if (name_match (r_name, lookup_name, NULL)) { lookup_name_info decl_lookup_name (renaming->declaration, lookup_name.match_type ()); ada_add_all_symbols (obstackp, block, decl_lookup_name, domain, 1, NULL); } renaming->searched = 0; } return num_defns_collected (obstackp) != defns_mark; } /* Implements compare_names, but only applying the comparision using the given CASING. */ static int compare_names_with_case (const char *string1, const char *string2, enum case_sensitivity casing) { while (*string1 != '\0' && *string2 != '\0') { char c1, c2; if (isspace (*string1) || isspace (*string2)) return strcmp_iw_ordered (string1, string2); if (casing == case_sensitive_off) { c1 = tolower (*string1); c2 = tolower (*string2); } else { c1 = *string1; c2 = *string2; } if (c1 != c2) break; string1 += 1; string2 += 1; } switch (*string1) { case '(': return strcmp_iw_ordered (string1, string2); case '_': if (*string2 == '\0') { if (is_name_suffix (string1)) return 0; else return 1; } /* FALLTHROUGH */ default: if (*string2 == '(') return strcmp_iw_ordered (string1, string2); else { if (casing == case_sensitive_off) return tolower (*string1) - tolower (*string2); else return *string1 - *string2; } } } /* Compare STRING1 to STRING2, with results as for strcmp. Compatible with strcmp_iw_ordered in that... strcmp_iw_ordered (STRING1, STRING2) <= 0 ... implies... compare_names (STRING1, STRING2) <= 0 (they may differ as to what symbols compare equal). */ static int compare_names (const char *string1, const char *string2) { int result; /* Similar to what strcmp_iw_ordered does, we need to perform a case-insensitive comparison first, and only resort to a second, case-sensitive, comparison if the first one was not sufficient to differentiate the two strings. */ result = compare_names_with_case (string1, string2, case_sensitive_off); if (result == 0) result = compare_names_with_case (string1, string2, case_sensitive_on); return result; } /* Convenience function to get at the Ada encoded lookup name for LOOKUP_NAME, as a C string. */ static const char * ada_lookup_name (const lookup_name_info &lookup_name) { return lookup_name.ada ().lookup_name ().c_str (); } /* Add to OBSTACKP all non-local symbols whose name and domain match LOOKUP_NAME and DOMAIN respectively. The search is performed on GLOBAL_BLOCK symbols if GLOBAL is non-zero, or on STATIC_BLOCK symbols otherwise. */ static void add_nonlocal_symbols (struct obstack *obstackp, const lookup_name_info &lookup_name, domain_enum domain, int global) { struct match_data data; memset (&data, 0, sizeof data); data.obstackp = obstackp; bool is_wild_match = lookup_name.ada ().wild_match_p (); auto callback = [&] (struct block_symbol *bsym) { return aux_add_nonlocal_symbols (bsym, &data); }; for (objfile *objfile : current_program_space->objfiles ()) { data.objfile = objfile; objfile->sf->qf->map_matching_symbols (objfile, lookup_name, domain, global, callback, (is_wild_match ? NULL : compare_names)); for (compunit_symtab *cu : objfile->compunits ()) { const struct block *global_block = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (cu), GLOBAL_BLOCK); if (ada_add_block_renamings (obstackp, global_block, lookup_name, domain)) data.found_sym = 1; } } if (num_defns_collected (obstackp) == 0 && global && !is_wild_match) { const char *name = ada_lookup_name (lookup_name); lookup_name_info name1 (std::string ("<_ada_") + name + '>', symbol_name_match_type::FULL); for (objfile *objfile : current_program_space->objfiles ()) { data.objfile = objfile; objfile->sf->qf->map_matching_symbols (objfile, name1, domain, global, callback, compare_names); } } } /* Find symbols in DOMAIN matching LOOKUP_NAME, in BLOCK and, if FULL_SEARCH is non-zero, enclosing scope and in global scopes, returning the number of matches. Add these to OBSTACKP. When FULL_SEARCH is non-zero, any non-function/non-enumeral symbol match within the nest of blocks whose innermost member is BLOCK, is the one match returned (no other matches in that or enclosing blocks is returned). If there are any matches in or surrounding BLOCK, then these alone are returned. Names prefixed with "standard__" are handled specially: "standard__" is first stripped off (by the lookup_name constructor), and only static and global symbols are searched. If MADE_GLOBAL_LOOKUP_P is non-null, set it before return to whether we had to lookup global symbols. */ static void ada_add_all_symbols (struct obstack *obstackp, const struct block *block, const lookup_name_info &lookup_name, domain_enum domain, int full_search, int *made_global_lookup_p) { struct symbol *sym; if (made_global_lookup_p) *made_global_lookup_p = 0; /* Special case: If the user specifies a symbol name inside package Standard, do a non-wild matching of the symbol name without the "standard__" prefix. This was primarily introduced in order to allow the user to specifically access the standard exceptions using, for instance, Standard.Constraint_Error when Constraint_Error is ambiguous (due to the user defining its own Constraint_Error entity inside its program). */ if (lookup_name.ada ().standard_p ()) block = NULL; /* Check the non-global symbols. If we have ANY match, then we're done. */ if (block != NULL) { if (full_search) ada_add_local_symbols (obstackp, lookup_name, block, domain); else { /* In the !full_search case we're are being called by ada_iterate_over_symbols, and we don't want to search superblocks. */ ada_add_block_symbols (obstackp, block, lookup_name, domain, NULL); } if (num_defns_collected (obstackp) > 0 || !full_search) return; } /* No non-global symbols found. Check our cache to see if we have already performed this search before. If we have, then return the same result. */ if (lookup_cached_symbol (ada_lookup_name (lookup_name), domain, &sym, &block)) { if (sym != NULL) add_defn_to_vec (obstackp, sym, block); return; } if (made_global_lookup_p) *made_global_lookup_p = 1; /* Search symbols from all global blocks. */ add_nonlocal_symbols (obstackp, lookup_name, domain, 1); /* Now add symbols from all per-file blocks if we've gotten no hits (not strictly correct, but perhaps better than an error). */ if (num_defns_collected (obstackp) == 0) add_nonlocal_symbols (obstackp, lookup_name, domain, 0); } /* Find symbols in DOMAIN matching LOOKUP_NAME, in BLOCK and, if FULL_SEARCH is non-zero, enclosing scope and in global scopes, returning the number of matches. Fills *RESULTS with (SYM,BLOCK) tuples, indicating the symbols found and the blocks and symbol tables (if any) in which they were found. When full_search is non-zero, any non-function/non-enumeral symbol match within the nest of blocks whose innermost member is BLOCK, is the one match returned (no other matches in that or enclosing blocks is returned). If there are any matches in or surrounding BLOCK, then these alone are returned. Names prefixed with "standard__" are handled specially: "standard__" is first stripped off, and only static and global symbols are searched. */ static int ada_lookup_symbol_list_worker (const lookup_name_info &lookup_name, const struct block *block, domain_enum domain, std::vector *results, int full_search) { int syms_from_global_search; int ndefns; auto_obstack obstack; ada_add_all_symbols (&obstack, block, lookup_name, domain, full_search, &syms_from_global_search); ndefns = num_defns_collected (&obstack); struct block_symbol *base = defns_collected (&obstack, 1); for (int i = 0; i < ndefns; ++i) results->push_back (base[i]); ndefns = remove_extra_symbols (results); if (ndefns == 0 && full_search && syms_from_global_search) cache_symbol (ada_lookup_name (lookup_name), domain, NULL, NULL); if (ndefns == 1 && full_search && syms_from_global_search) cache_symbol (ada_lookup_name (lookup_name), domain, (*results)[0].symbol, (*results)[0].block); ndefns = remove_irrelevant_renamings (results, block); return ndefns; } /* Find symbols in DOMAIN matching NAME, in BLOCK and enclosing scope and in global scopes, returning the number of matches, and filling *RESULTS with (SYM,BLOCK) tuples. See ada_lookup_symbol_list_worker for further details. */ int ada_lookup_symbol_list (const char *name, const struct block *block, domain_enum domain, std::vector *results) { symbol_name_match_type name_match_type = name_match_type_from_name (name); lookup_name_info lookup_name (name, name_match_type); return ada_lookup_symbol_list_worker (lookup_name, block, domain, results, 1); } /* Implementation of the la_iterate_over_symbols method. */ static bool ada_iterate_over_symbols (const struct block *block, const lookup_name_info &name, domain_enum domain, gdb::function_view callback) { int ndefs, i; std::vector results; ndefs = ada_lookup_symbol_list_worker (name, block, domain, &results, 0); for (i = 0; i < ndefs; ++i) { if (!callback (&results[i])) return false; } return true; } /* The result is as for ada_lookup_symbol_list with FULL_SEARCH set to 1, but choosing the first symbol found if there are multiple choices. The result is stored in *INFO, which must be non-NULL. If no match is found, INFO->SYM is set to NULL. */ void ada_lookup_encoded_symbol (const char *name, const struct block *block, domain_enum domain, struct block_symbol *info) { /* Since we already have an encoded name, wrap it in '<>' to force a verbatim match. Otherwise, if the name happens to not look like an encoded name (because it doesn't include a "__"), ada_lookup_name_info would re-encode/fold it again, and that would e.g., incorrectly lowercase object renaming names like "R28b" -> "r28b". */ std::string verbatim = std::string ("<") + name + '>'; gdb_assert (info != NULL); *info = ada_lookup_symbol (verbatim.c_str (), block, domain); } /* Return a symbol in DOMAIN matching NAME, in BLOCK0 and enclosing scope and in global scopes, or NULL if none. NAME is folded and encoded first. Otherwise, the result is as for ada_lookup_symbol_list, choosing the first symbol if there are multiple choices. */ struct block_symbol ada_lookup_symbol (const char *name, const struct block *block0, domain_enum domain) { std::vector candidates; int n_candidates; n_candidates = ada_lookup_symbol_list (name, block0, domain, &candidates); if (n_candidates == 0) return {}; block_symbol info = candidates[0]; info.symbol = fixup_symbol_section (info.symbol, NULL); return info; } static struct block_symbol ada_lookup_symbol_nonlocal (const struct language_defn *langdef, const char *name, const struct block *block, const domain_enum domain) { struct block_symbol sym; sym = ada_lookup_symbol (name, block_static_block (block), domain); if (sym.symbol != NULL) return sym; /* If we haven't found a match at this point, try the primitive types. In other languages, this search is performed before searching for global symbols in order to short-circuit that global-symbol search if it happens that the name corresponds to a primitive type. But we cannot do the same in Ada, because it is perfectly legitimate for a program to declare a type which has the same name as a standard type. If looking up a type in that situation, we have traditionally ignored the primitive type in favor of user-defined types. This is why, unlike most other languages, we search the primitive types this late and only after having searched the global symbols without success. */ if (domain == VAR_DOMAIN) { struct gdbarch *gdbarch; if (block == NULL) gdbarch = target_gdbarch (); else gdbarch = block_gdbarch (block); sym.symbol = language_lookup_primitive_type_as_symbol (langdef, gdbarch, name); if (sym.symbol != NULL) return sym; } return {}; } /* True iff STR is a possible encoded suffix of a normal Ada name that is to be ignored for matching purposes. Suffixes of parallel names (e.g., XVE) are not included here. Currently, the possible suffixes are given by any of the regular expressions: [.$][0-9]+ [nested subprogram suffix, on platforms such as GNU/Linux] ___[0-9]+ [nested subprogram suffix, on platforms such as HP/UX] TKB [subprogram suffix for task bodies] _E[0-9]+[bs]$ [protected object entry suffixes] (X[nb]*)?((\$|__)[0-9](_?[0-9]+)|___(JM|LJM|X([FDBUP].*|R[^T]?)))?$ Also, any leading "__[0-9]+" sequence is skipped before the suffix match is performed. This sequence is used to differentiate homonyms, is an optional part of a valid name suffix. */ static int is_name_suffix (const char *str) { int k; const char *matching; const int len = strlen (str); /* Skip optional leading __[0-9]+. */ if (len > 3 && str[0] == '_' && str[1] == '_' && isdigit (str[2])) { str += 3; while (isdigit (str[0])) str += 1; } /* [.$][0-9]+ */ if (str[0] == '.' || str[0] == '$') { matching = str + 1; while (isdigit (matching[0])) matching += 1; if (matching[0] == '\0') return 1; } /* ___[0-9]+ */ if (len > 3 && str[0] == '_' && str[1] == '_' && str[2] == '_') { matching = str + 3; while (isdigit (matching[0])) matching += 1; if (matching[0] == '\0') return 1; } /* "TKB" suffixes are used for subprograms implementing task bodies. */ if (strcmp (str, "TKB") == 0) return 1; #if 0 /* FIXME: brobecker/2005-09-23: Protected Object subprograms end with a N at the end. Unfortunately, the compiler uses the same convention for other internal types it creates. So treating all entity names that end with an "N" as a name suffix causes some regressions. For instance, consider the case of an enumerated type. To support the 'Image attribute, it creates an array whose name ends with N. Having a single character like this as a suffix carrying some information is a bit risky. Perhaps we should change the encoding to be something like "_N" instead. In the meantime, do not do the following check. */ /* Protected Object Subprograms */ if (len == 1 && str [0] == 'N') return 1; #endif /* _E[0-9]+[bs]$ */ if (len > 3 && str[0] == '_' && str [1] == 'E' && isdigit (str[2])) { matching = str + 3; while (isdigit (matching[0])) matching += 1; if ((matching[0] == 'b' || matching[0] == 's') && matching [1] == '\0') return 1; } /* ??? We should not modify STR directly, as we are doing below. This is fine in this case, but may become problematic later if we find that this alternative did not work, and want to try matching another one from the begining of STR. Since we modified it, we won't be able to find the begining of the string anymore! */ if (str[0] == 'X') { str += 1; while (str[0] != '_' && str[0] != '\0') { if (str[0] != 'n' && str[0] != 'b') return 0; str += 1; } } if (str[0] == '\000') return 1; if (str[0] == '_') { if (str[1] != '_' || str[2] == '\000') return 0; if (str[2] == '_') { if (strcmp (str + 3, "JM") == 0) return 1; /* FIXME: brobecker/2004-09-30: GNAT will soon stop using the LJM suffix in favor of the JM one. But we will still accept LJM as a valid suffix for a reasonable amount of time, just to allow ourselves to debug programs compiled using an older version of GNAT. */ if (strcmp (str + 3, "LJM") == 0) return 1; if (str[3] != 'X') return 0; if (str[4] == 'F' || str[4] == 'D' || str[4] == 'B' || str[4] == 'U' || str[4] == 'P') return 1; if (str[4] == 'R' && str[5] != 'T') return 1; return 0; } if (!isdigit (str[2])) return 0; for (k = 3; str[k] != '\0'; k += 1) if (!isdigit (str[k]) && str[k] != '_') return 0; return 1; } if (str[0] == '$' && isdigit (str[1])) { for (k = 2; str[k] != '\0'; k += 1) if (!isdigit (str[k]) && str[k] != '_') return 0; return 1; } return 0; } /* Return non-zero if the string starting at NAME and ending before NAME_END contains no capital letters. */ static int is_valid_name_for_wild_match (const char *name0) { std::string decoded_name = ada_decode (name0); int i; /* If the decoded name starts with an angle bracket, it means that NAME0 does not follow the GNAT encoding format. It should then not be allowed as a possible wild match. */ if (decoded_name[0] == '<') return 0; for (i=0; decoded_name[i] != '\0'; i++) if (isalpha (decoded_name[i]) && !islower (decoded_name[i])) return 0; return 1; } /* Advance *NAMEP to next occurrence of TARGET0 in the string NAME0 that could start a simple name. Assumes that *NAMEP points into the string beginning at NAME0. */ static int advance_wild_match (const char **namep, const char *name0, int target0) { const char *name = *namep; while (1) { int t0, t1; t0 = *name; if (t0 == '_') { t1 = name[1]; if ((t1 >= 'a' && t1 <= 'z') || (t1 >= '0' && t1 <= '9')) { name += 1; if (name == name0 + 5 && startswith (name0, "_ada")) break; else name += 1; } else if (t1 == '_' && ((name[2] >= 'a' && name[2] <= 'z') || name[2] == target0)) { name += 2; break; } else return 0; } else if ((t0 >= 'a' && t0 <= 'z') || (t0 >= '0' && t0 <= '9')) name += 1; else return 0; } *namep = name; return 1; } /* Return true iff NAME encodes a name of the form prefix.PATN. Ignores any informational suffixes of NAME (i.e., for which is_name_suffix is true). Assumes that PATN is a lower-cased Ada simple name. */ static bool wild_match (const char *name, const char *patn) { const char *p; const char *name0 = name; while (1) { const char *match = name; if (*name == *patn) { for (name += 1, p = patn + 1; *p != '\0'; name += 1, p += 1) if (*p != *name) break; if (*p == '\0' && is_name_suffix (name)) return match == name0 || is_valid_name_for_wild_match (name0); if (name[-1] == '_') name -= 1; } if (!advance_wild_match (&name, name0, *patn)) return false; } } /* Returns true iff symbol name SYM_NAME matches SEARCH_NAME, ignoring any trailing suffixes that encode debugging information or leading _ada_ on SYM_NAME (see is_name_suffix commentary for the debugging information that is ignored). */ static bool full_match (const char *sym_name, const char *search_name) { size_t search_name_len = strlen (search_name); if (strncmp (sym_name, search_name, search_name_len) == 0 && is_name_suffix (sym_name + search_name_len)) return true; if (startswith (sym_name, "_ada_") && strncmp (sym_name + 5, search_name, search_name_len) == 0 && is_name_suffix (sym_name + search_name_len + 5)) return true; return false; } /* Add symbols from BLOCK matching LOOKUP_NAME in DOMAIN to vector *defn_symbols, updating the list of symbols in OBSTACKP (if necessary). OBJFILE is the section containing BLOCK. */ static void ada_add_block_symbols (struct obstack *obstackp, const struct block *block, const lookup_name_info &lookup_name, domain_enum domain, struct objfile *objfile) { struct block_iterator iter; /* A matching argument symbol, if any. */ struct symbol *arg_sym; /* Set true when we find a matching non-argument symbol. */ int found_sym; struct symbol *sym; arg_sym = NULL; found_sym = 0; for (sym = block_iter_match_first (block, lookup_name, &iter); sym != NULL; sym = block_iter_match_next (lookup_name, &iter)) { if (symbol_matches_domain (sym->language (), SYMBOL_DOMAIN (sym), domain)) { if (SYMBOL_CLASS (sym) != LOC_UNRESOLVED) { if (SYMBOL_IS_ARGUMENT (sym)) arg_sym = sym; else { found_sym = 1; add_defn_to_vec (obstackp, fixup_symbol_section (sym, objfile), block); } } } } /* Handle renamings. */ if (ada_add_block_renamings (obstackp, block, lookup_name, domain)) found_sym = 1; if (!found_sym && arg_sym != NULL) { add_defn_to_vec (obstackp, fixup_symbol_section (arg_sym, objfile), block); } if (!lookup_name.ada ().wild_match_p ()) { arg_sym = NULL; found_sym = 0; const std::string &ada_lookup_name = lookup_name.ada ().lookup_name (); const char *name = ada_lookup_name.c_str (); size_t name_len = ada_lookup_name.size (); ALL_BLOCK_SYMBOLS (block, iter, sym) { if (symbol_matches_domain (sym->language (), SYMBOL_DOMAIN (sym), domain)) { int cmp; cmp = (int) '_' - (int) sym->linkage_name ()[0]; if (cmp == 0) { cmp = !startswith (sym->linkage_name (), "_ada_"); if (cmp == 0) cmp = strncmp (name, sym->linkage_name () + 5, name_len); } if (cmp == 0 && is_name_suffix (sym->linkage_name () + name_len + 5)) { if (SYMBOL_CLASS (sym) != LOC_UNRESOLVED) { if (SYMBOL_IS_ARGUMENT (sym)) arg_sym = sym; else { found_sym = 1; add_defn_to_vec (obstackp, fixup_symbol_section (sym, objfile), block); } } } } } /* NOTE: This really shouldn't be needed for _ada_ symbols. They aren't parameters, right? */ if (!found_sym && arg_sym != NULL) { add_defn_to_vec (obstackp, fixup_symbol_section (arg_sym, objfile), block); } } } /* Symbol Completion */ /* See symtab.h. */ bool ada_lookup_name_info::matches (const char *sym_name, symbol_name_match_type match_type, completion_match_result *comp_match_res) const { bool match = false; const char *text = m_encoded_name.c_str (); size_t text_len = m_encoded_name.size (); /* First, test against the fully qualified name of the symbol. */ if (strncmp (sym_name, text, text_len) == 0) match = true; std::string decoded_name = ada_decode (sym_name); if (match && !m_encoded_p) { /* One needed check before declaring a positive match is to verify that iff we are doing a verbatim match, the decoded version of the symbol name starts with '<'. Otherwise, this symbol name is not a suitable completion. */ bool has_angle_bracket = (decoded_name[0] == '<'); match = (has_angle_bracket == m_verbatim_p); } if (match && !m_verbatim_p) { /* When doing non-verbatim match, another check that needs to be done is to verify that the potentially matching symbol name does not include capital letters, because the ada-mode would not be able to understand these symbol names without the angle bracket notation. */ const char *tmp; for (tmp = sym_name; *tmp != '\0' && !isupper (*tmp); tmp++); if (*tmp != '\0') match = false; } /* Second: Try wild matching... */ if (!match && m_wild_match_p) { /* Since we are doing wild matching, this means that TEXT may represent an unqualified symbol name. We therefore must also compare TEXT against the unqualified name of the symbol. */ sym_name = ada_unqualified_name (decoded_name.c_str ()); if (strncmp (sym_name, text, text_len) == 0) match = true; } /* Finally: If we found a match, prepare the result to return. */ if (!match) return false; if (comp_match_res != NULL) { std::string &match_str = comp_match_res->match.storage (); if (!m_encoded_p) match_str = ada_decode (sym_name); else { if (m_verbatim_p) match_str = add_angle_brackets (sym_name); else match_str = sym_name; } comp_match_res->set_match (match_str.c_str ()); } return true; } /* Add the list of possible symbol names completing TEXT to TRACKER. WORD is the entire command on which completion is made. */ static void ada_collect_symbol_completion_matches (completion_tracker &tracker, complete_symbol_mode mode, symbol_name_match_type name_match_type, const char *text, const char *word, enum type_code code) { struct symbol *sym; const struct block *b, *surrounding_static_block = 0; struct block_iterator iter; gdb_assert (code == TYPE_CODE_UNDEF); lookup_name_info lookup_name (text, name_match_type, true); /* First, look at the partial symtab symbols. */ expand_symtabs_matching (NULL, lookup_name, NULL, NULL, ALL_DOMAIN); /* At this point scan through the misc symbol vectors and add each symbol you find to the list. Eventually we want to ignore anything that isn't a text symbol (everything else will be handled by the psymtab code above). */ for (objfile *objfile : current_program_space->objfiles ()) { for (minimal_symbol *msymbol : objfile->msymbols ()) { QUIT; if (completion_skip_symbol (mode, msymbol)) continue; language symbol_language = msymbol->language (); /* Ada minimal symbols won't have their language set to Ada. If we let completion_list_add_name compare using the default/C-like matcher, then when completing e.g., symbols in a package named "pck", we'd match internal Ada symbols like "pckS", which are invalid in an Ada expression, unless you wrap them in '<' '>' to request a verbatim match. Unfortunately, some Ada encoded names successfully demangle as C++ symbols (using an old mangling scheme), such as "name__2Xn" -> "Xn::name(void)" and thus some Ada minimal symbols end up with the wrong language set. Paper over that issue here. */ if (symbol_language == language_auto || symbol_language == language_cplus) symbol_language = language_ada; completion_list_add_name (tracker, symbol_language, msymbol->linkage_name (), lookup_name, text, word); } } /* Search upwards from currently selected frame (so that we can complete on local vars. */ for (b = get_selected_block (0); b != NULL; b = BLOCK_SUPERBLOCK (b)) { if (!BLOCK_SUPERBLOCK (b)) surrounding_static_block = b; /* For elmin of dups */ ALL_BLOCK_SYMBOLS (b, iter, sym) { if (completion_skip_symbol (mode, sym)) continue; completion_list_add_name (tracker, sym->language (), sym->linkage_name (), lookup_name, text, word); } } /* Go through the symtabs and check the externs and statics for symbols which match. */ for (objfile *objfile : current_program_space->objfiles ()) { for (compunit_symtab *s : objfile->compunits ()) { QUIT; b = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (s), GLOBAL_BLOCK); ALL_BLOCK_SYMBOLS (b, iter, sym) { if (completion_skip_symbol (mode, sym)) continue; completion_list_add_name (tracker, sym->language (), sym->linkage_name (), lookup_name, text, word); } } } for (objfile *objfile : current_program_space->objfiles ()) { for (compunit_symtab *s : objfile->compunits ()) { QUIT; b = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (s), STATIC_BLOCK); /* Don't do this block twice. */ if (b == surrounding_static_block) continue; ALL_BLOCK_SYMBOLS (b, iter, sym) { if (completion_skip_symbol (mode, sym)) continue; completion_list_add_name (tracker, sym->language (), sym->linkage_name (), lookup_name, text, word); } } } } /* Field Access */ /* Return non-zero if TYPE is a pointer to the GNAT dispatch table used for tagged types. */ static int ada_is_dispatch_table_ptr_type (struct type *type) { const char *name; if (TYPE_CODE (type) != TYPE_CODE_PTR) return 0; name = TYPE_NAME (TYPE_TARGET_TYPE (type)); if (name == NULL) return 0; return (strcmp (name, "ada__tags__dispatch_table") == 0); } /* Return non-zero if TYPE is an interface tag. */ static int ada_is_interface_tag (struct type *type) { const char *name = TYPE_NAME (type); if (name == NULL) return 0; return (strcmp (name, "ada__tags__interface_tag") == 0); } /* True if field number FIELD_NUM in struct or union type TYPE is supposed to be invisible to users. */ int ada_is_ignored_field (struct type *type, int field_num) { if (field_num < 0 || field_num > TYPE_NFIELDS (type)) return 1; /* Check the name of that field. */ { const char *name = TYPE_FIELD_NAME (type, field_num); /* Anonymous field names should not be printed. brobecker/2007-02-20: I don't think this can actually happen but we don't want to print the value of anonymous fields anyway. */ if (name == NULL) return 1; /* Normally, fields whose name start with an underscore ("_") are fields that have been internally generated by the compiler, and thus should not be printed. The "_parent" field is special, however: This is a field internally generated by the compiler for tagged types, and it contains the components inherited from the parent type. This field should not be printed as is, but should not be ignored either. */ if (name[0] == '_' && !startswith (name, "_parent")) return 1; } /* If this is the dispatch table of a tagged type or an interface tag, then ignore. */ if (ada_is_tagged_type (type, 1) && (ada_is_dispatch_table_ptr_type (TYPE_FIELD_TYPE (type, field_num)) || ada_is_interface_tag (TYPE_FIELD_TYPE (type, field_num)))) return 1; /* Not a special field, so it should not be ignored. */ return 0; } /* True iff TYPE has a tag field. If REFOK, then TYPE may also be a pointer or reference type whose ultimate target has a tag field. */ int ada_is_tagged_type (struct type *type, int refok) { return (ada_lookup_struct_elt_type (type, "_tag", refok, 1) != NULL); } /* True iff TYPE represents the type of X'Tag */ int ada_is_tag_type (struct type *type) { type = ada_check_typedef (type); if (type == NULL || TYPE_CODE (type) != TYPE_CODE_PTR) return 0; else { const char *name = ada_type_name (TYPE_TARGET_TYPE (type)); return (name != NULL && strcmp (name, "ada__tags__dispatch_table") == 0); } } /* The type of the tag on VAL. */ static struct type * ada_tag_type (struct value *val) { return ada_lookup_struct_elt_type (value_type (val), "_tag", 1, 0); } /* Return 1 if TAG follows the old scheme for Ada tags (used for Ada 95, retired at Ada 05). */ static int is_ada95_tag (struct value *tag) { return ada_value_struct_elt (tag, "tsd", 1) != NULL; } /* The value of the tag on VAL. */ static struct value * ada_value_tag (struct value *val) { return ada_value_struct_elt (val, "_tag", 0); } /* The value of the tag on the object of type TYPE whose contents are saved at VALADDR, if it is non-null, or is at memory address ADDRESS. */ static struct value * value_tag_from_contents_and_address (struct type *type, const gdb_byte *valaddr, CORE_ADDR address) { int tag_byte_offset; struct type *tag_type; if (find_struct_field ("_tag", type, 0, &tag_type, &tag_byte_offset, NULL, NULL, NULL)) { const gdb_byte *valaddr1 = ((valaddr == NULL) ? NULL : valaddr + tag_byte_offset); CORE_ADDR address1 = (address == 0) ? 0 : address + tag_byte_offset; return value_from_contents_and_address (tag_type, valaddr1, address1); } return NULL; } static struct type * type_from_tag (struct value *tag) { const char *type_name = ada_tag_name (tag); if (type_name != NULL) return ada_find_any_type (ada_encode (type_name)); return NULL; } /* Given a value OBJ of a tagged type, return a value of this type at the base address of the object. The base address, as defined in Ada.Tags, it is the address of the primary tag of the object, and therefore where the field values of its full view can be fetched. */ struct value * ada_tag_value_at_base_address (struct value *obj) { struct value *val; LONGEST offset_to_top = 0; struct type *ptr_type, *obj_type; struct value *tag; CORE_ADDR base_address; obj_type = value_type (obj); /* It is the responsability of the caller to deref pointers. */ if (TYPE_CODE (obj_type) == TYPE_CODE_PTR || TYPE_CODE (obj_type) == TYPE_CODE_REF) return obj; tag = ada_value_tag (obj); if (!tag) return obj; /* Base addresses only appeared with Ada 05 and multiple inheritance. */ if (is_ada95_tag (tag)) return obj; ptr_type = language_lookup_primitive_type (language_def (language_ada), target_gdbarch(), "storage_offset"); ptr_type = lookup_pointer_type (ptr_type); val = value_cast (ptr_type, tag); if (!val) return obj; /* It is perfectly possible that an exception be raised while trying to determine the base address, just like for the tag; see ada_tag_name for more details. We do not print the error message for the same reason. */ try { offset_to_top = value_as_long (value_ind (value_ptradd (val, -2))); } catch (const gdb_exception_error &e) { return obj; } /* If offset is null, nothing to do. */ if (offset_to_top == 0) return obj; /* -1 is a special case in Ada.Tags; however, what should be done is not quite clear from the documentation. So do nothing for now. */ if (offset_to_top == -1) return obj; /* OFFSET_TO_TOP used to be a positive value to be subtracted from the base address. This was however incompatible with C++ dispatch table: C++ uses a *negative* value to *add* to the base address. Ada's convention has therefore been changed in GNAT 19.0w 20171023: since then, C++ and Ada use the same convention. Here, we support both cases by checking the sign of OFFSET_TO_TOP. */ if (offset_to_top > 0) offset_to_top = -offset_to_top; base_address = value_address (obj) + offset_to_top; tag = value_tag_from_contents_and_address (obj_type, NULL, base_address); /* Make sure that we have a proper tag at the new address. Otherwise, offset_to_top is bogus (which can happen when the object is not initialized yet). */ if (!tag) return obj; obj_type = type_from_tag (tag); if (!obj_type) return obj; return value_from_contents_and_address (obj_type, NULL, base_address); } /* Return the "ada__tags__type_specific_data" type. */ static struct type * ada_get_tsd_type (struct inferior *inf) { struct ada_inferior_data *data = get_ada_inferior_data (inf); if (data->tsd_type == 0) data->tsd_type = ada_find_any_type ("ada__tags__type_specific_data"); return data->tsd_type; } /* Return the TSD (type-specific data) associated to the given TAG. TAG is assumed to be the tag of a tagged-type entity. May return NULL if we are unable to get the TSD. */ static struct value * ada_get_tsd_from_tag (struct value *tag) { struct value *val; struct type *type; /* First option: The TSD is simply stored as a field of our TAG. Only older versions of GNAT would use this format, but we have to test it first, because there are no visible markers for the current approach except the absence of that field. */ val = ada_value_struct_elt (tag, "tsd", 1); if (val) return val; /* Try the second representation for the dispatch table (in which there is no explicit 'tsd' field in the referent of the tag pointer, and instead the tsd pointer is stored just before the dispatch table. */ type = ada_get_tsd_type (current_inferior()); if (type == NULL) return NULL; type = lookup_pointer_type (lookup_pointer_type (type)); val = value_cast (type, tag); if (val == NULL) return NULL; return value_ind (value_ptradd (val, -1)); } /* Given the TSD of a tag (type-specific data), return a string containing the name of the associated type. The returned value is good until the next call. May return NULL if we are unable to determine the tag name. */ static char * ada_tag_name_from_tsd (struct value *tsd) { static char name[1024]; char *p; struct value *val; val = ada_value_struct_elt (tsd, "expanded_name", 1); if (val == NULL) return NULL; read_memory_string (value_as_address (val), name, sizeof (name) - 1); for (p = name; *p != '\0'; p += 1) if (isalpha (*p)) *p = tolower (*p); return name; } /* The type name of the dynamic type denoted by the 'tag value TAG, as a C string. Return NULL if the TAG is not an Ada tag, or if we were unable to determine the name of that tag. The result is good until the next call. */ const char * ada_tag_name (struct value *tag) { char *name = NULL; if (!ada_is_tag_type (value_type (tag))) return NULL; /* It is perfectly possible that an exception be raised while trying to determine the TAG's name, even under normal circumstances: The associated variable may be uninitialized or corrupted, for instance. We do not let any exception propagate past this point. instead we return NULL. We also do not print the error message either (which often is very low-level (Eg: "Cannot read memory at 0x[...]"), but instead let the caller print a more meaningful message if necessary. */ try { struct value *tsd = ada_get_tsd_from_tag (tag); if (tsd != NULL) name = ada_tag_name_from_tsd (tsd); } catch (const gdb_exception_error &e) { } return name; } /* The parent type of TYPE, or NULL if none. */ struct type * ada_parent_type (struct type *type) { int i; type = ada_check_typedef (type); if (type == NULL || TYPE_CODE (type) != TYPE_CODE_STRUCT) return NULL; for (i = 0; i < TYPE_NFIELDS (type); i += 1) if (ada_is_parent_field (type, i)) { struct type *parent_type = TYPE_FIELD_TYPE (type, i); /* If the _parent field is a pointer, then dereference it. */ if (TYPE_CODE (parent_type) == TYPE_CODE_PTR) parent_type = TYPE_TARGET_TYPE (parent_type); /* If there is a parallel XVS type, get the actual base type. */ parent_type = ada_get_base_type (parent_type); return ada_check_typedef (parent_type); } return NULL; } /* True iff field number FIELD_NUM of structure type TYPE contains the parent-type (inherited) fields of a derived type. Assumes TYPE is a structure type with at least FIELD_NUM+1 fields. */ int ada_is_parent_field (struct type *type, int field_num) { const char *name = TYPE_FIELD_NAME (ada_check_typedef (type), field_num); return (name != NULL && (startswith (name, "PARENT") || startswith (name, "_parent"))); } /* True iff field number FIELD_NUM of structure type TYPE is a transparent wrapper field (which should be silently traversed when doing field selection and flattened when printing). Assumes TYPE is a structure type with at least FIELD_NUM+1 fields. Such fields are always structures. */ int ada_is_wrapper_field (struct type *type, int field_num) { const char *name = TYPE_FIELD_NAME (type, field_num); if (name != NULL && strcmp (name, "RETVAL") == 0) { /* This happens in functions with "out" or "in out" parameters which are passed by copy. For such functions, GNAT describes the function's return type as being a struct where the return value is in a field called RETVAL, and where the other "out" or "in out" parameters are fields of that struct. This is not a wrapper. */ return 0; } return (name != NULL && (startswith (name, "PARENT") || strcmp (name, "REP") == 0 || startswith (name, "_parent") || name[0] == 'S' || name[0] == 'R' || name[0] == 'O')); } /* True iff field number FIELD_NUM of structure or union type TYPE is a variant wrapper. Assumes TYPE is a structure type with at least FIELD_NUM+1 fields. */ int ada_is_variant_part (struct type *type, int field_num) { /* Only Ada types are eligible. */ if (!ADA_TYPE_P (type)) return 0; struct type *field_type = TYPE_FIELD_TYPE (type, field_num); return (TYPE_CODE (field_type) == TYPE_CODE_UNION || (is_dynamic_field (type, field_num) && (TYPE_CODE (TYPE_TARGET_TYPE (field_type)) == TYPE_CODE_UNION))); } /* Assuming that VAR_TYPE is a variant wrapper (type of the variant part) whose discriminants are contained in the record type OUTER_TYPE, returns the type of the controlling discriminant for the variant. May return NULL if the type could not be found. */ struct type * ada_variant_discrim_type (struct type *var_type, struct type *outer_type) { const char *name = ada_variant_discrim_name (var_type); return ada_lookup_struct_elt_type (outer_type, name, 1, 1); } /* Assuming that TYPE is the type of a variant wrapper, and FIELD_NUM is a valid field number within it, returns 1 iff field FIELD_NUM of TYPE represents a 'when others' clause; otherwise 0. */ static int ada_is_others_clause (struct type *type, int field_num) { const char *name = TYPE_FIELD_NAME (type, field_num); return (name != NULL && name[0] == 'O'); } /* Assuming that TYPE0 is the type of the variant part of a record, returns the name of the discriminant controlling the variant. The value is valid until the next call to ada_variant_discrim_name. */ const char * ada_variant_discrim_name (struct type *type0) { static char *result = NULL; static size_t result_len = 0; struct type *type; const char *name; const char *discrim_end; const char *discrim_start; if (TYPE_CODE (type0) == TYPE_CODE_PTR) type = TYPE_TARGET_TYPE (type0); else type = type0; name = ada_type_name (type); if (name == NULL || name[0] == '\000') return ""; for (discrim_end = name + strlen (name) - 6; discrim_end != name; discrim_end -= 1) { if (startswith (discrim_end, "___XVN")) break; } if (discrim_end == name) return ""; for (discrim_start = discrim_end; discrim_start != name + 3; discrim_start -= 1) { if (discrim_start == name + 1) return ""; if ((discrim_start > name + 3 && startswith (discrim_start - 3, "___")) || discrim_start[-1] == '.') break; } GROW_VECT (result, result_len, discrim_end - discrim_start + 1); strncpy (result, discrim_start, discrim_end - discrim_start); result[discrim_end - discrim_start] = '\0'; return result; } /* Scan STR for a subtype-encoded number, beginning at position K. Put the position of the character just past the number scanned in *NEW_K, if NEW_K!=NULL. Put the scanned number in *R, if R!=NULL. Return 1 if there was a valid number at the given position, and 0 otherwise. A "subtype-encoded" number consists of the absolute value in decimal, followed by the letter 'm' to indicate a negative number. Assumes 0m does not occur. */ int ada_scan_number (const char str[], int k, LONGEST * R, int *new_k) { ULONGEST RU; if (!isdigit (str[k])) return 0; /* Do it the hard way so as not to make any assumption about the relationship of unsigned long (%lu scan format code) and LONGEST. */ RU = 0; while (isdigit (str[k])) { RU = RU * 10 + (str[k] - '0'); k += 1; } if (str[k] == 'm') { if (R != NULL) *R = (-(LONGEST) (RU - 1)) - 1; k += 1; } else if (R != NULL) *R = (LONGEST) RU; /* NOTE on the above: Technically, C does not say what the results of - (LONGEST) RU or (LONGEST) -RU are for RU == largest positive number representable as a LONGEST (although either would probably work in most implementations). When RU>0, the locution in the then branch above is always equivalent to the negative of RU. */ if (new_k != NULL) *new_k = k; return 1; } /* Assuming that TYPE is a variant part wrapper type (a VARIANTS field), and FIELD_NUM is a valid field number within it, returns 1 iff VAL is in the range encoded by field FIELD_NUM of TYPE; otherwise 0. */ static int ada_in_variant (LONGEST val, struct type *type, int field_num) { const char *name = TYPE_FIELD_NAME (type, field_num); int p; p = 0; while (1) { switch (name[p]) { case '\0': return 0; case 'S': { LONGEST W; if (!ada_scan_number (name, p + 1, &W, &p)) return 0; if (val == W) return 1; break; } case 'R': { LONGEST L, U; if (!ada_scan_number (name, p + 1, &L, &p) || name[p] != 'T' || !ada_scan_number (name, p + 1, &U, &p)) return 0; if (val >= L && val <= U) return 1; break; } case 'O': return 1; default: return 0; } } } /* FIXME: Lots of redundancy below. Try to consolidate. */ /* Given a value ARG1 (offset by OFFSET bytes) of a struct or union type ARG_TYPE, extract and return the value of one of its (non-static) fields. FIELDNO says which field. Differs from value_primitive_field only in that it can handle packed values of arbitrary type. */ static struct value * ada_value_primitive_field (struct value *arg1, int offset, int fieldno, struct type *arg_type) { struct type *type; arg_type = ada_check_typedef (arg_type); type = TYPE_FIELD_TYPE (arg_type, fieldno); /* Handle packed fields. It might be that the field is not packed relative to its containing structure, but the structure itself is packed; in this case we must take the bit-field path. */ if (TYPE_FIELD_BITSIZE (arg_type, fieldno) != 0 || value_bitpos (arg1) != 0) { int bit_pos = TYPE_FIELD_BITPOS (arg_type, fieldno); int bit_size = TYPE_FIELD_BITSIZE (arg_type, fieldno); return ada_value_primitive_packed_val (arg1, value_contents (arg1), offset + bit_pos / 8, bit_pos % 8, bit_size, type); } else return value_primitive_field (arg1, offset, fieldno, arg_type); } /* Find field with name NAME in object of type TYPE. If found, set the following for each argument that is non-null: - *FIELD_TYPE_P to the field's type; - *BYTE_OFFSET_P to OFFSET + the byte offset of the field within an object of that type; - *BIT_OFFSET_P to the bit offset modulo byte size of the field; - *BIT_SIZE_P to its size in bits if the field is packed, and 0 otherwise; If INDEX_P is non-null, increment *INDEX_P by the number of source-visible fields up to but not including the desired field, or by the total number of fields if not found. A NULL value of NAME never matches; the function just counts visible fields in this case. Notice that we need to handle when a tagged record hierarchy has some components with the same name, like in this scenario: type Top_T is tagged record N : Integer := 1; U : Integer := 974; A : Integer := 48; end record; type Middle_T is new Top.Top_T with record N : Character := 'a'; C : Integer := 3; end record; type Bottom_T is new Middle.Middle_T with record N : Float := 4.0; C : Character := '5'; X : Integer := 6; A : Character := 'J'; end record; Let's say we now have a variable declared and initialized as follow: TC : Top_A := new Bottom_T; And then we use this variable to call this function procedure Assign (Obj: in out Top_T; TV : Integer); as follow: Assign (Top_T (B), 12); Now, we're in the debugger, and we're inside that procedure then and we want to print the value of obj.c: Usually, the tagged record or one of the parent type owns the component to print and there's no issue but in this particular case, what does it mean to ask for Obj.C? Since the actual type for object is type Bottom_T, it could mean two things: type component C from the Middle_T view, but also component C from Bottom_T. So in that "undefined" case, when the component is not found in the non-resolved type (which includes all the components of the parent type), then resolve it and see if we get better luck once expanded. In the case of homonyms in the derived tagged type, we don't guaranty anything, and pick the one that's easiest for us to program. Returns 1 if found, 0 otherwise. */ static int find_struct_field (const char *name, struct type *type, int offset, struct type **field_type_p, int *byte_offset_p, int *bit_offset_p, int *bit_size_p, int *index_p) { int i; int parent_offset = -1; type = ada_check_typedef (type); if (field_type_p != NULL) *field_type_p = NULL; if (byte_offset_p != NULL) *byte_offset_p = 0; if (bit_offset_p != NULL) *bit_offset_p = 0; if (bit_size_p != NULL) *bit_size_p = 0; for (i = 0; i < TYPE_NFIELDS (type); i += 1) { int bit_pos = TYPE_FIELD_BITPOS (type, i); int fld_offset = offset + bit_pos / 8; const char *t_field_name = TYPE_FIELD_NAME (type, i); if (t_field_name == NULL) continue; else if (ada_is_parent_field (type, i)) { /* This is a field pointing us to the parent type of a tagged type. As hinted in this function's documentation, we give preference to fields in the current record first, so what we do here is just record the index of this field before we skip it. If it turns out we couldn't find our field in the current record, then we'll get back to it and search inside it whether the field might exist in the parent. */ parent_offset = i; continue; } else if (name != NULL && field_name_match (t_field_name, name)) { int bit_size = TYPE_FIELD_BITSIZE (type, i); if (field_type_p != NULL) *field_type_p = TYPE_FIELD_TYPE (type, i); if (byte_offset_p != NULL) *byte_offset_p = fld_offset; if (bit_offset_p != NULL) *bit_offset_p = bit_pos % 8; if (bit_size_p != NULL) *bit_size_p = bit_size; return 1; } else if (ada_is_wrapper_field (type, i)) { if (find_struct_field (name, TYPE_FIELD_TYPE (type, i), fld_offset, field_type_p, byte_offset_p, bit_offset_p, bit_size_p, index_p)) return 1; } else if (ada_is_variant_part (type, i)) { /* PNH: Wait. Do we ever execute this section, or is ARG always of fixed type?? */ int j; struct type *field_type = ada_check_typedef (TYPE_FIELD_TYPE (type, i)); for (j = 0; j < TYPE_NFIELDS (field_type); j += 1) { if (find_struct_field (name, TYPE_FIELD_TYPE (field_type, j), fld_offset + TYPE_FIELD_BITPOS (field_type, j) / 8, field_type_p, byte_offset_p, bit_offset_p, bit_size_p, index_p)) return 1; } } else if (index_p != NULL) *index_p += 1; } /* Field not found so far. If this is a tagged type which has a parent, try finding that field in the parent now. */ if (parent_offset != -1) { int bit_pos = TYPE_FIELD_BITPOS (type, parent_offset); int fld_offset = offset + bit_pos / 8; if (find_struct_field (name, TYPE_FIELD_TYPE (type, parent_offset), fld_offset, field_type_p, byte_offset_p, bit_offset_p, bit_size_p, index_p)) return 1; } return 0; } /* Number of user-visible fields in record type TYPE. */ static int num_visible_fields (struct type *type) { int n; n = 0; find_struct_field (NULL, type, 0, NULL, NULL, NULL, NULL, &n); return n; } /* Look for a field NAME in ARG. Adjust the address of ARG by OFFSET bytes, and search in it assuming it has (class) type TYPE. If found, return value, else return NULL. Searches recursively through wrapper fields (e.g., '_parent'). In the case of homonyms in the tagged types, please refer to the long explanation in find_struct_field's function documentation. */ static struct value * ada_search_struct_field (const char *name, struct value *arg, int offset, struct type *type) { int i; int parent_offset = -1; type = ada_check_typedef (type); for (i = 0; i < TYPE_NFIELDS (type); i += 1) { const char *t_field_name = TYPE_FIELD_NAME (type, i); if (t_field_name == NULL) continue; else if (ada_is_parent_field (type, i)) { /* This is a field pointing us to the parent type of a tagged type. As hinted in this function's documentation, we give preference to fields in the current record first, so what we do here is just record the index of this field before we skip it. If it turns out we couldn't find our field in the current record, then we'll get back to it and search inside it whether the field might exist in the parent. */ parent_offset = i; continue; } else if (field_name_match (t_field_name, name)) return ada_value_primitive_field (arg, offset, i, type); else if (ada_is_wrapper_field (type, i)) { struct value *v = /* Do not let indent join lines here. */ ada_search_struct_field (name, arg, offset + TYPE_FIELD_BITPOS (type, i) / 8, TYPE_FIELD_TYPE (type, i)); if (v != NULL) return v; } else if (ada_is_variant_part (type, i)) { /* PNH: Do we ever get here? See find_struct_field. */ int j; struct type *field_type = ada_check_typedef (TYPE_FIELD_TYPE (type, i)); int var_offset = offset + TYPE_FIELD_BITPOS (type, i) / 8; for (j = 0; j < TYPE_NFIELDS (field_type); j += 1) { struct value *v = ada_search_struct_field /* Force line break. */ (name, arg, var_offset + TYPE_FIELD_BITPOS (field_type, j) / 8, TYPE_FIELD_TYPE (field_type, j)); if (v != NULL) return v; } } } /* Field not found so far. If this is a tagged type which has a parent, try finding that field in the parent now. */ if (parent_offset != -1) { struct value *v = ada_search_struct_field ( name, arg, offset + TYPE_FIELD_BITPOS (type, parent_offset) / 8, TYPE_FIELD_TYPE (type, parent_offset)); if (v != NULL) return v; } return NULL; } static struct value *ada_index_struct_field_1 (int *, struct value *, int, struct type *); /* Return field #INDEX in ARG, where the index is that returned by * find_struct_field through its INDEX_P argument. Adjust the address * of ARG by OFFSET bytes, and search in it assuming it has (class) type TYPE. * If found, return value, else return NULL. */ static struct value * ada_index_struct_field (int index, struct value *arg, int offset, struct type *type) { return ada_index_struct_field_1 (&index, arg, offset, type); } /* Auxiliary function for ada_index_struct_field. Like * ada_index_struct_field, but takes index from *INDEX_P and modifies * *INDEX_P. */ static struct value * ada_index_struct_field_1 (int *index_p, struct value *arg, int offset, struct type *type) { int i; type = ada_check_typedef (type); for (i = 0; i < TYPE_NFIELDS (type); i += 1) { if (TYPE_FIELD_NAME (type, i) == NULL) continue; else if (ada_is_wrapper_field (type, i)) { struct value *v = /* Do not let indent join lines here. */ ada_index_struct_field_1 (index_p, arg, offset + TYPE_FIELD_BITPOS (type, i) / 8, TYPE_FIELD_TYPE (type, i)); if (v != NULL) return v; } else if (ada_is_variant_part (type, i)) { /* PNH: Do we ever get here? See ada_search_struct_field, find_struct_field. */ error (_("Cannot assign this kind of variant record")); } else if (*index_p == 0) return ada_value_primitive_field (arg, offset, i, type); else *index_p -= 1; } return NULL; } /* Return a string representation of type TYPE. */ static std::string type_as_string (struct type *type) { string_file tmp_stream; type_print (type, "", &tmp_stream, -1); return std::move (tmp_stream.string ()); } /* Given a type TYPE, look up the type of the component of type named NAME. If DISPP is non-null, add its byte displacement from the beginning of a structure (pointed to by a value) of type TYPE to *DISPP (does not work for packed fields). Matches any field whose name has NAME as a prefix, possibly followed by "___". TYPE can be either a struct or union. If REFOK, TYPE may also be a (pointer or reference)+ to a struct or union, and the ultimate target type will be searched. Looks recursively into variant clauses and parent types. In the case of homonyms in the tagged types, please refer to the long explanation in find_struct_field's function documentation. If NOERR is nonzero, return NULL if NAME is not suitably defined or TYPE is not a type of the right kind. */ static struct type * ada_lookup_struct_elt_type (struct type *type, const char *name, int refok, int noerr) { int i; int parent_offset = -1; if (name == NULL) goto BadName; if (refok && type != NULL) while (1) { type = ada_check_typedef (type); if (TYPE_CODE (type) != TYPE_CODE_PTR && TYPE_CODE (type) != TYPE_CODE_REF) break; type = TYPE_TARGET_TYPE (type); } if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_STRUCT && TYPE_CODE (type) != TYPE_CODE_UNION)) { if (noerr) return NULL; error (_("Type %s is not a structure or union type"), type != NULL ? type_as_string (type).c_str () : _("(null)")); } type = to_static_fixed_type (type); for (i = 0; i < TYPE_NFIELDS (type); i += 1) { const char *t_field_name = TYPE_FIELD_NAME (type, i); struct type *t; if (t_field_name == NULL) continue; else if (ada_is_parent_field (type, i)) { /* This is a field pointing us to the parent type of a tagged type. As hinted in this function's documentation, we give preference to fields in the current record first, so what we do here is just record the index of this field before we skip it. If it turns out we couldn't find our field in the current record, then we'll get back to it and search inside it whether the field might exist in the parent. */ parent_offset = i; continue; } else if (field_name_match (t_field_name, name)) return TYPE_FIELD_TYPE (type, i); else if (ada_is_wrapper_field (type, i)) { t = ada_lookup_struct_elt_type (TYPE_FIELD_TYPE (type, i), name, 0, 1); if (t != NULL) return t; } else if (ada_is_variant_part (type, i)) { int j; struct type *field_type = ada_check_typedef (TYPE_FIELD_TYPE (type, i)); for (j = TYPE_NFIELDS (field_type) - 1; j >= 0; j -= 1) { /* FIXME pnh 2008/01/26: We check for a field that is NOT wrapped in a struct, since the compiler sometimes generates these for unchecked variant types. Revisit if the compiler changes this practice. */ const char *v_field_name = TYPE_FIELD_NAME (field_type, j); if (v_field_name != NULL && field_name_match (v_field_name, name)) t = TYPE_FIELD_TYPE (field_type, j); else t = ada_lookup_struct_elt_type (TYPE_FIELD_TYPE (field_type, j), name, 0, 1); if (t != NULL) return t; } } } /* Field not found so far. If this is a tagged type which has a parent, try finding that field in the parent now. */ if (parent_offset != -1) { struct type *t; t = ada_lookup_struct_elt_type (TYPE_FIELD_TYPE (type, parent_offset), name, 0, 1); if (t != NULL) return t; } BadName: if (!noerr) { const char *name_str = name != NULL ? name : _(""); error (_("Type %s has no component named %s"), type_as_string (type).c_str (), name_str); } return NULL; } /* Assuming that VAR_TYPE is the type of a variant part of a record (a union), within a value of type OUTER_TYPE, return true iff VAR_TYPE represents an unchecked union (that is, the variant part of a record that is named in an Unchecked_Union pragma). */ static int is_unchecked_variant (struct type *var_type, struct type *outer_type) { const char *discrim_name = ada_variant_discrim_name (var_type); return (ada_lookup_struct_elt_type (outer_type, discrim_name, 0, 1) == NULL); } /* Assuming that VAR_TYPE is the type of a variant part of a record (a union), within a value of type OUTER_TYPE that is stored in GDB at OUTER_VALADDR, determine which variant clause (field number in VAR_TYPE, numbering from 0) is applicable. Returns -1 if none are. */ int ada_which_variant_applies (struct type *var_type, struct type *outer_type, const gdb_byte *outer_valaddr) { int others_clause; int i; const char *discrim_name = ada_variant_discrim_name (var_type); struct value *outer; struct value *discrim; LONGEST discrim_val; /* Using plain value_from_contents_and_address here causes problems because we will end up trying to resolve a type that is currently being constructed. */ outer = value_from_contents_and_address_unresolved (outer_type, outer_valaddr, 0); discrim = ada_value_struct_elt (outer, discrim_name, 1); if (discrim == NULL) return -1; discrim_val = value_as_long (discrim); others_clause = -1; for (i = 0; i < TYPE_NFIELDS (var_type); i += 1) { if (ada_is_others_clause (var_type, i)) others_clause = i; else if (ada_in_variant (discrim_val, var_type, i)) return i; } return others_clause; } /* Dynamic-Sized Records */ /* Strategy: The type ostensibly attached to a value with dynamic size (i.e., a size that is not statically recorded in the debugging data) does not accurately reflect the size or layout of the value. Our strategy is to convert these values to values with accurate, conventional types that are constructed on the fly. */ /* There is a subtle and tricky problem here. In general, we cannot determine the size of dynamic records without its data. However, the 'struct value' data structure, which GDB uses to represent quantities in the inferior process (the target), requires the size of the type at the time of its allocation in order to reserve space for GDB's internal copy of the data. That's why the 'to_fixed_xxx_type' routines take (target) addresses as parameters, rather than struct value*s. However, GDB's internal history variables ($1, $2, etc.) are struct value*s containing internal copies of the data that are not, in general, the same as the data at their corresponding addresses in the target. Fortunately, the types we give to these values are all conventional, fixed-size types (as per the strategy described above), so that we don't usually have to perform the 'to_fixed_xxx_type' conversions to look at their values. Unfortunately, there is one exception: if one of the internal history variables is an array whose elements are unconstrained records, then we will need to create distinct fixed types for each element selected. */ /* The upshot of all of this is that many routines take a (type, host address, target address) triple as arguments to represent a value. The host address, if non-null, is supposed to contain an internal copy of the relevant data; otherwise, the program is to consult the target at the target address. */ /* Assuming that VAL0 represents a pointer value, the result of dereferencing it. Differs from value_ind in its treatment of dynamic-sized types. */ struct value * ada_value_ind (struct value *val0) { struct value *val = value_ind (val0); if (ada_is_tagged_type (value_type (val), 0)) val = ada_tag_value_at_base_address (val); return ada_to_fixed_value (val); } /* The value resulting from dereferencing any "reference to" qualifiers on VAL0. */ static struct value * ada_coerce_ref (struct value *val0) { if (TYPE_CODE (value_type (val0)) == TYPE_CODE_REF) { struct value *val = val0; val = coerce_ref (val); if (ada_is_tagged_type (value_type (val), 0)) val = ada_tag_value_at_base_address (val); return ada_to_fixed_value (val); } else return val0; } /* Return OFF rounded upward if necessary to a multiple of ALIGNMENT (a power of 2). */ static unsigned int align_value (unsigned int off, unsigned int alignment) { return (off + alignment - 1) & ~(alignment - 1); } /* Return the bit alignment required for field #F of template type TYPE. */ static unsigned int field_alignment (struct type *type, int f) { const char *name = TYPE_FIELD_NAME (type, f); int len; int align_offset; /* The field name should never be null, unless the debugging information is somehow malformed. In this case, we assume the field does not require any alignment. */ if (name == NULL) return 1; len = strlen (name); if (!isdigit (name[len - 1])) return 1; if (isdigit (name[len - 2])) align_offset = len - 2; else align_offset = len - 1; if (align_offset < 7 || !startswith (name + align_offset - 6, "___XV")) return TARGET_CHAR_BIT; return atoi (name + align_offset) * TARGET_CHAR_BIT; } /* Find a typedef or tag symbol named NAME. Ignores ambiguity. */ static struct symbol * ada_find_any_type_symbol (const char *name) { struct symbol *sym; sym = standard_lookup (name, get_selected_block (NULL), VAR_DOMAIN); if (sym != NULL && SYMBOL_CLASS (sym) == LOC_TYPEDEF) return sym; sym = standard_lookup (name, NULL, STRUCT_DOMAIN); return sym; } /* Find a type named NAME. Ignores ambiguity. This routine will look solely for types defined by debug info, it will not search the GDB primitive types. */ static struct type * ada_find_any_type (const char *name) { struct symbol *sym = ada_find_any_type_symbol (name); if (sym != NULL) return SYMBOL_TYPE (sym); return NULL; } /* Given NAME_SYM and an associated BLOCK, find a "renaming" symbol associated with NAME_SYM's name. NAME_SYM may itself be a renaming symbol, in which case it is returned. Otherwise, this looks for symbols whose name is that of NAME_SYM suffixed with "___XR". Return symbol if found, and NULL otherwise. */ static bool ada_is_renaming_symbol (struct symbol *name_sym) { const char *name = name_sym->linkage_name (); return strstr (name, "___XR") != NULL; } /* Because of GNAT encoding conventions, several GDB symbols may match a given type name. If the type denoted by TYPE0 is to be preferred to that of TYPE1 for purposes of type printing, return non-zero; otherwise return 0. */ int ada_prefer_type (struct type *type0, struct type *type1) { if (type1 == NULL) return 1; else if (type0 == NULL) return 0; else if (TYPE_CODE (type1) == TYPE_CODE_VOID) return 1; else if (TYPE_CODE (type0) == TYPE_CODE_VOID) return 0; else if (TYPE_NAME (type1) == NULL && TYPE_NAME (type0) != NULL) return 1; else if (ada_is_constrained_packed_array_type (type0)) return 1; else if (ada_is_array_descriptor_type (type0) && !ada_is_array_descriptor_type (type1)) return 1; else { const char *type0_name = TYPE_NAME (type0); const char *type1_name = TYPE_NAME (type1); if (type0_name != NULL && strstr (type0_name, "___XR") != NULL && (type1_name == NULL || strstr (type1_name, "___XR") == NULL)) return 1; } return 0; } /* The name of TYPE, which is its TYPE_NAME. Null if TYPE is null. */ const char * ada_type_name (struct type *type) { if (type == NULL) return NULL; return TYPE_NAME (type); } /* Search the list of "descriptive" types associated to TYPE for a type whose name is NAME. */ static struct type * find_parallel_type_by_descriptive_type (struct type *type, const char *name) { struct type *result, *tmp; if (ada_ignore_descriptive_types_p) return NULL; /* If there no descriptive-type info, then there is no parallel type to be found. */ if (!HAVE_GNAT_AUX_INFO (type)) return NULL; result = TYPE_DESCRIPTIVE_TYPE (type); while (result != NULL) { const char *result_name = ada_type_name (result); if (result_name == NULL) { warning (_("unexpected null name on descriptive type")); return NULL; } /* If the names match, stop. */ if (strcmp (result_name, name) == 0) break; /* Otherwise, look at the next item on the list, if any. */ if (HAVE_GNAT_AUX_INFO (result)) tmp = TYPE_DESCRIPTIVE_TYPE (result); else tmp = NULL; /* If not found either, try after having resolved the typedef. */ if (tmp != NULL) result = tmp; else { result = check_typedef (result); if (HAVE_GNAT_AUX_INFO (result)) result = TYPE_DESCRIPTIVE_TYPE (result); else result = NULL; } } /* If we didn't find a match, see whether this is a packed array. With older compilers, the descriptive type information is either absent or irrelevant when it comes to packed arrays so the above lookup fails. Fall back to using a parallel lookup by name in this case. */ if (result == NULL && ada_is_constrained_packed_array_type (type)) return ada_find_any_type (name); return result; } /* Find a parallel type to TYPE with the specified NAME, using the descriptive type taken from the debugging information, if available, and otherwise using the (slower) name-based method. */ static struct type * ada_find_parallel_type_with_name (struct type *type, const char *name) { struct type *result = NULL; if (HAVE_GNAT_AUX_INFO (type)) result = find_parallel_type_by_descriptive_type (type, name); else result = ada_find_any_type (name); return result; } /* Same as above, but specify the name of the parallel type by appending SUFFIX to the name of TYPE. */ struct type * ada_find_parallel_type (struct type *type, const char *suffix) { char *name; const char *type_name = ada_type_name (type); int len; if (type_name == NULL) return NULL; len = strlen (type_name); name = (char *) alloca (len + strlen (suffix) + 1); strcpy (name, type_name); strcpy (name + len, suffix); return ada_find_parallel_type_with_name (type, name); } /* If TYPE is a variable-size record type, return the corresponding template type describing its fields. Otherwise, return NULL. */ static struct type * dynamic_template_type (struct type *type) { type = ada_check_typedef (type); if (type == NULL || TYPE_CODE (type) != TYPE_CODE_STRUCT || ada_type_name (type) == NULL) return NULL; else { int len = strlen (ada_type_name (type)); if (len > 6 && strcmp (ada_type_name (type) + len - 6, "___XVE") == 0) return type; else return ada_find_parallel_type (type, "___XVE"); } } /* Assuming that TEMPL_TYPE is a union or struct type, returns non-zero iff field FIELD_NUM of TEMPL_TYPE has dynamic size. */ static int is_dynamic_field (struct type *templ_type, int field_num) { const char *name = TYPE_FIELD_NAME (templ_type, field_num); return name != NULL && TYPE_CODE (TYPE_FIELD_TYPE (templ_type, field_num)) == TYPE_CODE_PTR && strstr (name, "___XVL") != NULL; } /* The index of the variant field of TYPE, or -1 if TYPE does not represent a variant record type. */ static int variant_field_index (struct type *type) { int f; if (type == NULL || TYPE_CODE (type) != TYPE_CODE_STRUCT) return -1; for (f = 0; f < TYPE_NFIELDS (type); f += 1) { if (ada_is_variant_part (type, f)) return f; } return -1; } /* A record type with no fields. */ static struct type * empty_record (struct type *templ) { struct type *type = alloc_type_copy (templ); TYPE_CODE (type) = TYPE_CODE_STRUCT; TYPE_NFIELDS (type) = 0; TYPE_FIELDS (type) = NULL; INIT_NONE_SPECIFIC (type); TYPE_NAME (type) = ""; TYPE_LENGTH (type) = 0; return type; } /* An ordinary record type (with fixed-length fields) that describes the value of type TYPE at VALADDR or ADDRESS (see comments at the beginning of this section) VAL according to GNAT conventions. DVAL0 should describe the (portion of a) record that contains any necessary discriminants. It should be NULL if value_type (VAL) is an outer-level type (i.e., as opposed to a branch of a variant.) A variant field (unless unchecked) is replaced by a particular branch of the variant. If not KEEP_DYNAMIC_FIELDS, then all fields whose position or length are not statically known are discarded. As a consequence, VALADDR, ADDRESS and DVAL0 are ignored. NOTE: Limitations: For now, we assume that dynamic fields and variants occupy whole numbers of bytes. However, they need not be byte-aligned. */ struct type * ada_template_to_fixed_record_type_1 (struct type *type, const gdb_byte *valaddr, CORE_ADDR address, struct value *dval0, int keep_dynamic_fields) { struct value *mark = value_mark (); struct value *dval; struct type *rtype; int nfields, bit_len; int variant_field; long off; int fld_bit_len; int f; /* Compute the number of fields in this record type that are going to be processed: unless keep_dynamic_fields, this includes only fields whose position and length are static will be processed. */ if (keep_dynamic_fields) nfields = TYPE_NFIELDS (type); else { nfields = 0; while (nfields < TYPE_NFIELDS (type) && !ada_is_variant_part (type, nfields) && !is_dynamic_field (type, nfields)) nfields++; } rtype = alloc_type_copy (type); TYPE_CODE (rtype) = TYPE_CODE_STRUCT; INIT_NONE_SPECIFIC (rtype); TYPE_NFIELDS (rtype) = nfields; TYPE_FIELDS (rtype) = (struct field *) TYPE_ALLOC (rtype, nfields * sizeof (struct field)); memset (TYPE_FIELDS (rtype), 0, sizeof (struct field) * nfields); TYPE_NAME (rtype) = ada_type_name (type); TYPE_FIXED_INSTANCE (rtype) = 1; off = 0; bit_len = 0; variant_field = -1; for (f = 0; f < nfields; f += 1) { off = align_value (off, field_alignment (type, f)) + TYPE_FIELD_BITPOS (type, f); SET_FIELD_BITPOS (TYPE_FIELD (rtype, f), off); TYPE_FIELD_BITSIZE (rtype, f) = 0; if (ada_is_variant_part (type, f)) { variant_field = f; fld_bit_len = 0; } else if (is_dynamic_field (type, f)) { const gdb_byte *field_valaddr = valaddr; CORE_ADDR field_address = address; struct type *field_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, f)); if (dval0 == NULL) { /* rtype's length is computed based on the run-time value of discriminants. If the discriminants are not initialized, the type size may be completely bogus and GDB may fail to allocate a value for it. So check the size first before creating the value. */ ada_ensure_varsize_limit (rtype); /* Using plain value_from_contents_and_address here causes problems because we will end up trying to resolve a type that is currently being constructed. */ dval = value_from_contents_and_address_unresolved (rtype, valaddr, address); rtype = value_type (dval); } else dval = dval0; /* If the type referenced by this field is an aligner type, we need to unwrap that aligner type, because its size might not be set. Keeping the aligner type would cause us to compute the wrong size for this field, impacting the offset of the all the fields that follow this one. */ if (ada_is_aligner_type (field_type)) { long field_offset = TYPE_FIELD_BITPOS (field_type, f); field_valaddr = cond_offset_host (field_valaddr, field_offset); field_address = cond_offset_target (field_address, field_offset); field_type = ada_aligned_type (field_type); } field_valaddr = cond_offset_host (field_valaddr, off / TARGET_CHAR_BIT); field_address = cond_offset_target (field_address, off / TARGET_CHAR_BIT); /* Get the fixed type of the field. Note that, in this case, we do not want to get the real type out of the tag: if the current field is the parent part of a tagged record, we will get the tag of the object. Clearly wrong: the real type of the parent is not the real type of the child. We would end up in an infinite loop. */ field_type = ada_get_base_type (field_type); field_type = ada_to_fixed_type (field_type, field_valaddr, field_address, dval, 0); /* If the field size is already larger than the maximum object size, then the record itself will necessarily be larger than the maximum object size. We need to make this check now, because the size might be so ridiculously large (due to an uninitialized variable in the inferior) that it would cause an overflow when adding it to the record size. */ ada_ensure_varsize_limit (field_type); TYPE_FIELD_TYPE (rtype, f) = field_type; TYPE_FIELD_NAME (rtype, f) = TYPE_FIELD_NAME (type, f); /* The multiplication can potentially overflow. But because the field length has been size-checked just above, and assuming that the maximum size is a reasonable value, an overflow should not happen in practice. So rather than adding overflow recovery code to this already complex code, we just assume that it's not going to happen. */ fld_bit_len = TYPE_LENGTH (TYPE_FIELD_TYPE (rtype, f)) * TARGET_CHAR_BIT; } else { /* Note: If this field's type is a typedef, it is important to preserve the typedef layer. Otherwise, we might be transforming a typedef to a fat pointer (encoding a pointer to an unconstrained array), into a basic fat pointer (encoding an unconstrained array). As both types are implemented using the same structure, the typedef is the only clue which allows us to distinguish between the two options. Stripping it would prevent us from printing this field appropriately. */ TYPE_FIELD_TYPE (rtype, f) = TYPE_FIELD_TYPE (type, f); TYPE_FIELD_NAME (rtype, f) = TYPE_FIELD_NAME (type, f); if (TYPE_FIELD_BITSIZE (type, f) > 0) fld_bit_len = TYPE_FIELD_BITSIZE (rtype, f) = TYPE_FIELD_BITSIZE (type, f); else { struct type *field_type = TYPE_FIELD_TYPE (type, f); /* We need to be careful of typedefs when computing the length of our field. If this is a typedef, get the length of the target type, not the length of the typedef. */ if (TYPE_CODE (field_type) == TYPE_CODE_TYPEDEF) field_type = ada_typedef_target_type (field_type); fld_bit_len = TYPE_LENGTH (ada_check_typedef (field_type)) * TARGET_CHAR_BIT; } } if (off + fld_bit_len > bit_len) bit_len = off + fld_bit_len; off += fld_bit_len; TYPE_LENGTH (rtype) = align_value (bit_len, TARGET_CHAR_BIT) / TARGET_CHAR_BIT; } /* We handle the variant part, if any, at the end because of certain odd cases in which it is re-ordered so as NOT to be the last field of the record. This can happen in the presence of representation clauses. */ if (variant_field >= 0) { struct type *branch_type; off = TYPE_FIELD_BITPOS (rtype, variant_field); if (dval0 == NULL) { /* Using plain value_from_contents_and_address here causes problems because we will end up trying to resolve a type that is currently being constructed. */ dval = value_from_contents_and_address_unresolved (rtype, valaddr, address); rtype = value_type (dval); } else dval = dval0; branch_type = to_fixed_variant_branch_type (TYPE_FIELD_TYPE (type, variant_field), cond_offset_host (valaddr, off / TARGET_CHAR_BIT), cond_offset_target (address, off / TARGET_CHAR_BIT), dval); if (branch_type == NULL) { for (f = variant_field + 1; f < TYPE_NFIELDS (rtype); f += 1) TYPE_FIELDS (rtype)[f - 1] = TYPE_FIELDS (rtype)[f]; TYPE_NFIELDS (rtype) -= 1; } else { TYPE_FIELD_TYPE (rtype, variant_field) = branch_type; TYPE_FIELD_NAME (rtype, variant_field) = "S"; fld_bit_len = TYPE_LENGTH (TYPE_FIELD_TYPE (rtype, variant_field)) * TARGET_CHAR_BIT; if (off + fld_bit_len > bit_len) bit_len = off + fld_bit_len; TYPE_LENGTH (rtype) = align_value (bit_len, TARGET_CHAR_BIT) / TARGET_CHAR_BIT; } } /* According to exp_dbug.ads, the size of TYPE for variable-size records should contain the alignment of that record, which should be a strictly positive value. If null or negative, then something is wrong, most probably in the debug info. In that case, we don't round up the size of the resulting type. If this record is not part of another structure, the current RTYPE length might be good enough for our purposes. */ if (TYPE_LENGTH (type) <= 0) { if (TYPE_NAME (rtype)) warning (_("Invalid type size for `%s' detected: %s."), TYPE_NAME (rtype), pulongest (TYPE_LENGTH (type))); else warning (_("Invalid type size for detected: %s."), pulongest (TYPE_LENGTH (type))); } else { TYPE_LENGTH (rtype) = align_value (TYPE_LENGTH (rtype), TYPE_LENGTH (type)); } value_free_to_mark (mark); if (TYPE_LENGTH (rtype) > varsize_limit) error (_("record type with dynamic size is larger than varsize-limit")); return rtype; } /* As for ada_template_to_fixed_record_type_1 with KEEP_DYNAMIC_FIELDS of 1. */ static struct type * template_to_fixed_record_type (struct type *type, const gdb_byte *valaddr, CORE_ADDR address, struct value *dval0) { return ada_template_to_fixed_record_type_1 (type, valaddr, address, dval0, 1); } /* An ordinary record type in which ___XVL-convention fields and ___XVU- and ___XVN-convention field types in TYPE0 are replaced with static approximations, containing all possible fields. Uses no runtime values. Useless for use in values, but that's OK, since the results are used only for type determinations. Works on both structs and unions. Representation note: to save space, we memorize the result of this function in the TYPE_TARGET_TYPE of the template type. */ static struct type * template_to_static_fixed_type (struct type *type0) { struct type *type; int nfields; int f; /* No need no do anything if the input type is already fixed. */ if (TYPE_FIXED_INSTANCE (type0)) return type0; /* Likewise if we already have computed the static approximation. */ if (TYPE_TARGET_TYPE (type0) != NULL) return TYPE_TARGET_TYPE (type0); /* Don't clone TYPE0 until we are sure we are going to need a copy. */ type = type0; nfields = TYPE_NFIELDS (type0); /* Whether or not we cloned TYPE0, cache the result so that we don't do recompute all over next time. */ TYPE_TARGET_TYPE (type0) = type; for (f = 0; f < nfields; f += 1) { struct type *field_type = TYPE_FIELD_TYPE (type0, f); struct type *new_type; if (is_dynamic_field (type0, f)) { field_type = ada_check_typedef (field_type); new_type = to_static_fixed_type (TYPE_TARGET_TYPE (field_type)); } else new_type = static_unwrap_type (field_type); if (new_type != field_type) { /* Clone TYPE0 only the first time we get a new field type. */ if (type == type0) { TYPE_TARGET_TYPE (type0) = type = alloc_type_copy (type0); TYPE_CODE (type) = TYPE_CODE (type0); INIT_NONE_SPECIFIC (type); TYPE_NFIELDS (type) = nfields; TYPE_FIELDS (type) = (struct field *) TYPE_ALLOC (type, nfields * sizeof (struct field)); memcpy (TYPE_FIELDS (type), TYPE_FIELDS (type0), sizeof (struct field) * nfields); TYPE_NAME (type) = ada_type_name (type0); TYPE_FIXED_INSTANCE (type) = 1; TYPE_LENGTH (type) = 0; } TYPE_FIELD_TYPE (type, f) = new_type; TYPE_FIELD_NAME (type, f) = TYPE_FIELD_NAME (type0, f); } } return type; } /* Given an object of type TYPE whose contents are at VALADDR and whose address in memory is ADDRESS, returns a revision of TYPE, which should be a non-dynamic-sized record, in which the variant part, if any, is replaced with the appropriate branch. Looks for discriminant values in DVAL0, which can be NULL if the record contains the necessary discriminant values. */ static struct type * to_record_with_fixed_variant_part (struct type *type, const gdb_byte *valaddr, CORE_ADDR address, struct value *dval0) { struct value *mark = value_mark (); struct value *dval; struct type *rtype; struct type *branch_type; int nfields = TYPE_NFIELDS (type); int variant_field = variant_field_index (type); if (variant_field == -1) return type; if (dval0 == NULL) { dval = value_from_contents_and_address (type, valaddr, address); type = value_type (dval); } else dval = dval0; rtype = alloc_type_copy (type); TYPE_CODE (rtype) = TYPE_CODE_STRUCT; INIT_NONE_SPECIFIC (rtype); TYPE_NFIELDS (rtype) = nfields; TYPE_FIELDS (rtype) = (struct field *) TYPE_ALLOC (rtype, nfields * sizeof (struct field)); memcpy (TYPE_FIELDS (rtype), TYPE_FIELDS (type), sizeof (struct field) * nfields); TYPE_NAME (rtype) = ada_type_name (type); TYPE_FIXED_INSTANCE (rtype) = 1; TYPE_LENGTH (rtype) = TYPE_LENGTH (type); branch_type = to_fixed_variant_branch_type (TYPE_FIELD_TYPE (type, variant_field), cond_offset_host (valaddr, TYPE_FIELD_BITPOS (type, variant_field) / TARGET_CHAR_BIT), cond_offset_target (address, TYPE_FIELD_BITPOS (type, variant_field) / TARGET_CHAR_BIT), dval); if (branch_type == NULL) { int f; for (f = variant_field + 1; f < nfields; f += 1) TYPE_FIELDS (rtype)[f - 1] = TYPE_FIELDS (rtype)[f]; TYPE_NFIELDS (rtype) -= 1; } else { TYPE_FIELD_TYPE (rtype, variant_field) = branch_type; TYPE_FIELD_NAME (rtype, variant_field) = "S"; TYPE_FIELD_BITSIZE (rtype, variant_field) = 0; TYPE_LENGTH (rtype) += TYPE_LENGTH (branch_type); } TYPE_LENGTH (rtype) -= TYPE_LENGTH (TYPE_FIELD_TYPE (type, variant_field)); value_free_to_mark (mark); return rtype; } /* An ordinary record type (with fixed-length fields) that describes the value at (TYPE0, VALADDR, ADDRESS) [see explanation at beginning of this section]. Any necessary discriminants' values should be in DVAL, a record value; it may be NULL if the object at ADDR itself contains any necessary discriminant values. Additionally, VALADDR and ADDRESS may also be NULL if no discriminant values from the record are needed. Except in the case that DVAL, VALADDR, and ADDRESS are all 0 or NULL, a variant field (unless unchecked) is replaced by a particular branch of the variant. NOTE: the case in which DVAL and VALADDR are NULL and ADDRESS is 0 is questionable and may be removed. It can arise during the processing of an unconstrained-array-of-record type where all the variant branches have exactly the same size. This is because in such cases, the compiler does not bother to use the XVS convention when encoding the record. I am currently dubious of this shortcut and suspect the compiler should be altered. FIXME. */ static struct type * to_fixed_record_type (struct type *type0, const gdb_byte *valaddr, CORE_ADDR address, struct value *dval) { struct type *templ_type; if (TYPE_FIXED_INSTANCE (type0)) return type0; templ_type = dynamic_template_type (type0); if (templ_type != NULL) return template_to_fixed_record_type (templ_type, valaddr, address, dval); else if (variant_field_index (type0) >= 0) { if (dval == NULL && valaddr == NULL && address == 0) return type0; return to_record_with_fixed_variant_part (type0, valaddr, address, dval); } else { TYPE_FIXED_INSTANCE (type0) = 1; return type0; } } /* An ordinary record type (with fixed-length fields) that describes the value at (VAR_TYPE0, VALADDR, ADDRESS), where VAR_TYPE0 is a union type. Any necessary discriminants' values should be in DVAL, a record value. That is, this routine selects the appropriate branch of the union at ADDR according to the discriminant value indicated in the union's type name. Returns VAR_TYPE0 itself if it represents a variant subject to a pragma Unchecked_Union. */ static struct type * to_fixed_variant_branch_type (struct type *var_type0, const gdb_byte *valaddr, CORE_ADDR address, struct value *dval) { int which; struct type *templ_type; struct type *var_type; if (TYPE_CODE (var_type0) == TYPE_CODE_PTR) var_type = TYPE_TARGET_TYPE (var_type0); else var_type = var_type0; templ_type = ada_find_parallel_type (var_type, "___XVU"); if (templ_type != NULL) var_type = templ_type; if (is_unchecked_variant (var_type, value_type (dval))) return var_type0; which = ada_which_variant_applies (var_type, value_type (dval), value_contents (dval)); if (which < 0) return empty_record (var_type); else if (is_dynamic_field (var_type, which)) return to_fixed_record_type (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (var_type, which)), valaddr, address, dval); else if (variant_field_index (TYPE_FIELD_TYPE (var_type, which)) >= 0) return to_fixed_record_type (TYPE_FIELD_TYPE (var_type, which), valaddr, address, dval); else return TYPE_FIELD_TYPE (var_type, which); } /* Assuming RANGE_TYPE is a TYPE_CODE_RANGE, return nonzero if ENCODING_TYPE, a type following the GNAT conventions for discrete type encodings, only carries redundant information. */ static int ada_is_redundant_range_encoding (struct type *range_type, struct type *encoding_type) { const char *bounds_str; int n; LONGEST lo, hi; gdb_assert (TYPE_CODE (range_type) == TYPE_CODE_RANGE); if (TYPE_CODE (get_base_type (range_type)) != TYPE_CODE (get_base_type (encoding_type))) { /* The compiler probably used a simple base type to describe the range type instead of the range's actual base type, expecting us to get the real base type from the encoding anyway. In this situation, the encoding cannot be ignored as redundant. */ return 0; } if (is_dynamic_type (range_type)) return 0; if (TYPE_NAME (encoding_type) == NULL) return 0; bounds_str = strstr (TYPE_NAME (encoding_type), "___XDLU_"); if (bounds_str == NULL) return 0; n = 8; /* Skip "___XDLU_". */ if (!ada_scan_number (bounds_str, n, &lo, &n)) return 0; if (TYPE_LOW_BOUND (range_type) != lo) return 0; n += 2; /* Skip the "__" separator between the two bounds. */ if (!ada_scan_number (bounds_str, n, &hi, &n)) return 0; if (TYPE_HIGH_BOUND (range_type) != hi) return 0; return 1; } /* Given the array type ARRAY_TYPE, return nonzero if DESC_TYPE, a type following the GNAT encoding for describing array type indices, only carries redundant information. */ static int ada_is_redundant_index_type_desc (struct type *array_type, struct type *desc_type) { struct type *this_layer = check_typedef (array_type); int i; for (i = 0; i < TYPE_NFIELDS (desc_type); i++) { if (!ada_is_redundant_range_encoding (TYPE_INDEX_TYPE (this_layer), TYPE_FIELD_TYPE (desc_type, i))) return 0; this_layer = check_typedef (TYPE_TARGET_TYPE (this_layer)); } return 1; } /* Assuming that TYPE0 is an array type describing the type of a value at ADDR, and that DVAL describes a record containing any discriminants used in TYPE0, returns a type for the value that contains no dynamic components (that is, no components whose sizes are determined by run-time quantities). Unless IGNORE_TOO_BIG is true, gives an error message if the resulting type's size is over varsize_limit. */ static struct type * to_fixed_array_type (struct type *type0, struct value *dval, int ignore_too_big) { struct type *index_type_desc; struct type *result; int constrained_packed_array_p; static const char *xa_suffix = "___XA"; type0 = ada_check_typedef (type0); if (TYPE_FIXED_INSTANCE (type0)) return type0; constrained_packed_array_p = ada_is_constrained_packed_array_type (type0); if (constrained_packed_array_p) type0 = decode_constrained_packed_array_type (type0); index_type_desc = ada_find_parallel_type (type0, xa_suffix); /* As mentioned in exp_dbug.ads, for non bit-packed arrays an encoding suffixed with 'P' may still be generated. If so, it should be used to find the XA type. */ if (index_type_desc == NULL) { const char *type_name = ada_type_name (type0); if (type_name != NULL) { const int len = strlen (type_name); char *name = (char *) alloca (len + strlen (xa_suffix)); if (type_name[len - 1] == 'P') { strcpy (name, type_name); strcpy (name + len - 1, xa_suffix); index_type_desc = ada_find_parallel_type_with_name (type0, name); } } } ada_fixup_array_indexes_type (index_type_desc); if (index_type_desc != NULL && ada_is_redundant_index_type_desc (type0, index_type_desc)) { /* Ignore this ___XA parallel type, as it does not bring any useful information. This allows us to avoid creating fixed versions of the array's index types, which would be identical to the original ones. This, in turn, can also help avoid the creation of fixed versions of the array itself. */ index_type_desc = NULL; } if (index_type_desc == NULL) { struct type *elt_type0 = ada_check_typedef (TYPE_TARGET_TYPE (type0)); /* NOTE: elt_type---the fixed version of elt_type0---should never depend on the contents of the array in properly constructed debugging data. */ /* Create a fixed version of the array element type. We're not providing the address of an element here, and thus the actual object value cannot be inspected to do the conversion. This should not be a problem, since arrays of unconstrained objects are not allowed. In particular, all the elements of an array of a tagged type should all be of the same type specified in the debugging info. No need to consult the object tag. */ struct type *elt_type = ada_to_fixed_type (elt_type0, 0, 0, dval, 1); /* Make sure we always create a new array type when dealing with packed array types, since we're going to fix-up the array type length and element bitsize a little further down. */ if (elt_type0 == elt_type && !constrained_packed_array_p) result = type0; else result = create_array_type (alloc_type_copy (type0), elt_type, TYPE_INDEX_TYPE (type0)); } else { int i; struct type *elt_type0; elt_type0 = type0; for (i = TYPE_NFIELDS (index_type_desc); i > 0; i -= 1) elt_type0 = TYPE_TARGET_TYPE (elt_type0); /* NOTE: result---the fixed version of elt_type0---should never depend on the contents of the array in properly constructed debugging data. */ /* Create a fixed version of the array element type. We're not providing the address of an element here, and thus the actual object value cannot be inspected to do the conversion. This should not be a problem, since arrays of unconstrained objects are not allowed. In particular, all the elements of an array of a tagged type should all be of the same type specified in the debugging info. No need to consult the object tag. */ result = ada_to_fixed_type (ada_check_typedef (elt_type0), 0, 0, dval, 1); elt_type0 = type0; for (i = TYPE_NFIELDS (index_type_desc) - 1; i >= 0; i -= 1) { struct type *range_type = to_fixed_range_type (TYPE_FIELD_TYPE (index_type_desc, i), dval); result = create_array_type (alloc_type_copy (elt_type0), result, range_type); elt_type0 = TYPE_TARGET_TYPE (elt_type0); } if (!ignore_too_big && TYPE_LENGTH (result) > varsize_limit) error (_("array type with dynamic size is larger than varsize-limit")); } /* We want to preserve the type name. This can be useful when trying to get the type name of a value that has already been printed (for instance, if the user did "print VAR; whatis $". */ TYPE_NAME (result) = TYPE_NAME (type0); if (constrained_packed_array_p) { /* So far, the resulting type has been created as if the original type was a regular (non-packed) array type. As a result, the bitsize of the array elements needs to be set again, and the array length needs to be recomputed based on that bitsize. */ int len = TYPE_LENGTH (result) / TYPE_LENGTH (TYPE_TARGET_TYPE (result)); int elt_bitsize = TYPE_FIELD_BITSIZE (type0, 0); TYPE_FIELD_BITSIZE (result, 0) = TYPE_FIELD_BITSIZE (type0, 0); TYPE_LENGTH (result) = len * elt_bitsize / HOST_CHAR_BIT; if (TYPE_LENGTH (result) * HOST_CHAR_BIT < len * elt_bitsize) TYPE_LENGTH (result)++; } TYPE_FIXED_INSTANCE (result) = 1; return result; } /* A standard type (containing no dynamically sized components) corresponding to TYPE for the value (TYPE, VALADDR, ADDRESS) DVAL describes a record containing any discriminants used in TYPE0, and may be NULL if there are none, or if the object of type TYPE at ADDRESS or in VALADDR contains these discriminants. If CHECK_TAG is not null, in the case of tagged types, this function attempts to locate the object's tag and use it to compute the actual type. However, when ADDRESS is null, we cannot use it to determine the location of the tag, and therefore compute the tagged type's actual type. So we return the tagged type without consulting the tag. */ static struct type * ada_to_fixed_type_1 (struct type *type, const gdb_byte *valaddr, CORE_ADDR address, struct value *dval, int check_tag) { type = ada_check_typedef (type); /* Only un-fixed types need to be handled here. */ if (!HAVE_GNAT_AUX_INFO (type)) return type; switch (TYPE_CODE (type)) { default: return type; case TYPE_CODE_STRUCT: { struct type *static_type = to_static_fixed_type (type); struct type *fixed_record_type = to_fixed_record_type (type, valaddr, address, NULL); /* If STATIC_TYPE is a tagged type and we know the object's address, then we can determine its tag, and compute the object's actual type from there. Note that we have to use the fixed record type (the parent part of the record may have dynamic fields and the way the location of _tag is expressed may depend on them). */ if (check_tag && address != 0 && ada_is_tagged_type (static_type, 0)) { struct value *tag = value_tag_from_contents_and_address (fixed_record_type, valaddr, address); struct type *real_type = type_from_tag (tag); struct value *obj = value_from_contents_and_address (fixed_record_type, valaddr, address); fixed_record_type = value_type (obj); if (real_type != NULL) return to_fixed_record_type (real_type, NULL, value_address (ada_tag_value_at_base_address (obj)), NULL); } /* Check to see if there is a parallel ___XVZ variable. If there is, then it provides the actual size of our type. */ else if (ada_type_name (fixed_record_type) != NULL) { const char *name = ada_type_name (fixed_record_type); char *xvz_name = (char *) alloca (strlen (name) + 7 /* "___XVZ\0" */); bool xvz_found = false; LONGEST size; xsnprintf (xvz_name, strlen (name) + 7, "%s___XVZ", name); try { xvz_found = get_int_var_value (xvz_name, size); } catch (const gdb_exception_error &except) { /* We found the variable, but somehow failed to read its value. Rethrow the same error, but with a little bit more information, to help the user understand what went wrong (Eg: the variable might have been optimized out). */ throw_error (except.error, _("unable to read value of %s (%s)"), xvz_name, except.what ()); } if (xvz_found && TYPE_LENGTH (fixed_record_type) != size) { fixed_record_type = copy_type (fixed_record_type); TYPE_LENGTH (fixed_record_type) = size; /* The FIXED_RECORD_TYPE may have be a stub. We have observed this when the debugging info is STABS, and apparently it is something that is hard to fix. In practice, we don't need the actual type definition at all, because the presence of the XVZ variable allows us to assume that there must be a XVS type as well, which we should be able to use later, when we need the actual type definition. In the meantime, pretend that the "fixed" type we are returning is NOT a stub, because this can cause trouble when using this type to create new types targeting it. Indeed, the associated creation routines often check whether the target type is a stub and will try to replace it, thus using a type with the wrong size. This, in turn, might cause the new type to have the wrong size too. Consider the case of an array, for instance, where the size of the array is computed from the number of elements in our array multiplied by the size of its element. */ TYPE_STUB (fixed_record_type) = 0; } } return fixed_record_type; } case TYPE_CODE_ARRAY: return to_fixed_array_type (type, dval, 1); case TYPE_CODE_UNION: if (dval == NULL) return type; else return to_fixed_variant_branch_type (type, valaddr, address, dval); } } /* The same as ada_to_fixed_type_1, except that it preserves the type if it is a TYPE_CODE_TYPEDEF of a type that is already fixed. The typedef layer needs be preserved in order to differentiate between arrays and array pointers when both types are implemented using the same fat pointer. In the array pointer case, the pointer is encoded as a typedef of the pointer type. For instance, considering: type String_Access is access String; S1 : String_Access := null; To the debugger, S1 is defined as a typedef of type String. But to the user, it is a pointer. So if the user tries to print S1, we should not dereference the array, but print the array address instead. If we didn't preserve the typedef layer, we would lose the fact that the type is to be presented as a pointer (needs de-reference before being printed). And we would also use the source-level type name. */ struct type * ada_to_fixed_type (struct type *type, const gdb_byte *valaddr, CORE_ADDR address, struct value *dval, int check_tag) { struct type *fixed_type = ada_to_fixed_type_1 (type, valaddr, address, dval, check_tag); /* If TYPE is a typedef and its target type is the same as the FIXED_TYPE, then preserve the typedef layer. Implementation note: We can only check the main-type portion of the TYPE and FIXED_TYPE, because eliminating the typedef layer from TYPE now returns a type that has the same instance flags as TYPE. For instance, if TYPE is a "typedef const", and its target type is a "struct", then the typedef elimination will return a "const" version of the target type. See check_typedef for more details about how the typedef layer elimination is done. brobecker/2010-11-19: It seems to me that the only case where it is useful to preserve the typedef layer is when dealing with fat pointers. Perhaps, we could add a check for that and preserve the typedef layer only in that situation. But this seems unnecessary so far, probably because we call check_typedef/ada_check_typedef pretty much everywhere. */ if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF && (TYPE_MAIN_TYPE (ada_typedef_target_type (type)) == TYPE_MAIN_TYPE (fixed_type))) return type; return fixed_type; } /* A standard (static-sized) type corresponding as well as possible to TYPE0, but based on no runtime data. */ static struct type * to_static_fixed_type (struct type *type0) { struct type *type; if (type0 == NULL) return NULL; if (TYPE_FIXED_INSTANCE (type0)) return type0; type0 = ada_check_typedef (type0); switch (TYPE_CODE (type0)) { default: return type0; case TYPE_CODE_STRUCT: type = dynamic_template_type (type0); if (type != NULL) return template_to_static_fixed_type (type); else return template_to_static_fixed_type (type0); case TYPE_CODE_UNION: type = ada_find_parallel_type (type0, "___XVU"); if (type != NULL) return template_to_static_fixed_type (type); else return template_to_static_fixed_type (type0); } } /* A static approximation of TYPE with all type wrappers removed. */ static struct type * static_unwrap_type (struct type *type) { if (ada_is_aligner_type (type)) { struct type *type1 = TYPE_FIELD_TYPE (ada_check_typedef (type), 0); if (ada_type_name (type1) == NULL) TYPE_NAME (type1) = ada_type_name (type); return static_unwrap_type (type1); } else { struct type *raw_real_type = ada_get_base_type (type); if (raw_real_type == type) return type; else return to_static_fixed_type (raw_real_type); } } /* In some cases, incomplete and private types require cross-references that are not resolved as records (for example, type Foo; type FooP is access Foo; V: FooP; type Foo is array ...; ). In these cases, since there is no mechanism for producing cross-references to such types, we instead substitute for FooP a stub enumeration type that is nowhere resolved, and whose tag is the name of the actual type. Call these types "non-record stubs". */ /* A type equivalent to TYPE that is not a non-record stub, if one exists, otherwise TYPE. */ struct type * ada_check_typedef (struct type *type) { if (type == NULL) return NULL; /* If our type is an access to an unconstrained array, which is encoded as a TYPE_CODE_TYPEDEF of a fat pointer, then we're done. We don't want to strip the TYPE_CODE_TYPDEF layer, because this is what allows us to distinguish between fat pointers that represent array types, and fat pointers that represent array access types (in both cases, the compiler implements them as fat pointers). */ if (ada_is_access_to_unconstrained_array (type)) return type; type = check_typedef (type); if (type == NULL || TYPE_CODE (type) != TYPE_CODE_ENUM || !TYPE_STUB (type) || TYPE_NAME (type) == NULL) return type; else { const char *name = TYPE_NAME (type); struct type *type1 = ada_find_any_type (name); if (type1 == NULL) return type; /* TYPE1 might itself be a TYPE_CODE_TYPEDEF (this can happen with stubs pointing to arrays, as we don't create symbols for array types, only for the typedef-to-array types). If that's the case, strip the typedef layer. */ if (TYPE_CODE (type1) == TYPE_CODE_TYPEDEF) type1 = ada_check_typedef (type1); return type1; } } /* A value representing the data at VALADDR/ADDRESS as described by type TYPE0, but with a standard (static-sized) type that correctly describes it. If VAL0 is not NULL and TYPE0 already is a standard type, then return VAL0 [this feature is simply to avoid redundant creation of struct values]. */ static struct value * ada_to_fixed_value_create (struct type *type0, CORE_ADDR address, struct value *val0) { struct type *type = ada_to_fixed_type (type0, 0, address, NULL, 1); if (type == type0 && val0 != NULL) return val0; if (VALUE_LVAL (val0) != lval_memory) { /* Our value does not live in memory; it could be a convenience variable, for instance. Create a not_lval value using val0's contents. */ return value_from_contents (type, value_contents (val0)); } return value_from_contents_and_address (type, 0, address); } /* A value representing VAL, but with a standard (static-sized) type that correctly describes it. Does not necessarily create a new value. */ struct value * ada_to_fixed_value (struct value *val) { val = unwrap_value (val); val = ada_to_fixed_value_create (value_type (val), value_address (val), val); return val; } /* Attributes */ /* Table mapping attribute numbers to names. NOTE: Keep up to date with enum ada_attribute definition in ada-lang.h. */ static const char *attribute_names[] = { "", "first", "last", "length", "image", "max", "min", "modulus", "pos", "size", "tag", "val", 0 }; static const char * ada_attribute_name (enum exp_opcode n) { if (n >= OP_ATR_FIRST && n <= (int) OP_ATR_VAL) return attribute_names[n - OP_ATR_FIRST + 1]; else return attribute_names[0]; } /* Evaluate the 'POS attribute applied to ARG. */ static LONGEST pos_atr (struct value *arg) { struct value *val = coerce_ref (arg); struct type *type = value_type (val); LONGEST result; if (!discrete_type_p (type)) error (_("'POS only defined on discrete types")); if (!discrete_position (type, value_as_long (val), &result)) error (_("enumeration value is invalid: can't find 'POS")); return result; } static struct value * value_pos_atr (struct type *type, struct value *arg) { return value_from_longest (type, pos_atr (arg)); } /* Evaluate the TYPE'VAL attribute applied to ARG. */ static struct value * value_val_atr (struct type *type, struct value *arg) { if (!discrete_type_p (type)) error (_("'VAL only defined on discrete types")); if (!integer_type_p (value_type (arg))) error (_("'VAL requires integral argument")); if (TYPE_CODE (type) == TYPE_CODE_ENUM) { long pos = value_as_long (arg); if (pos < 0 || pos >= TYPE_NFIELDS (type)) error (_("argument to 'VAL out of range")); return value_from_longest (type, TYPE_FIELD_ENUMVAL (type, pos)); } else return value_from_longest (type, value_as_long (arg)); } /* Evaluation */ /* True if TYPE appears to be an Ada character type. [At the moment, this is true only for Character and Wide_Character; It is a heuristic test that could stand improvement]. */ bool ada_is_character_type (struct type *type) { const char *name; /* If the type code says it's a character, then assume it really is, and don't check any further. */ if (TYPE_CODE (type) == TYPE_CODE_CHAR) return true; /* Otherwise, assume it's a character type iff it is a discrete type with a known character type name. */ name = ada_type_name (type); return (name != NULL && (TYPE_CODE (type) == TYPE_CODE_INT || TYPE_CODE (type) == TYPE_CODE_RANGE) && (strcmp (name, "character") == 0 || strcmp (name, "wide_character") == 0 || strcmp (name, "wide_wide_character") == 0 || strcmp (name, "unsigned char") == 0)); } /* True if TYPE appears to be an Ada string type. */ bool ada_is_string_type (struct type *type) { type = ada_check_typedef (type); if (type != NULL && TYPE_CODE (type) != TYPE_CODE_PTR && (ada_is_simple_array_type (type) || ada_is_array_descriptor_type (type)) && ada_array_arity (type) == 1) { struct type *elttype = ada_array_element_type (type, 1); return ada_is_character_type (elttype); } else return false; } /* The compiler sometimes provides a parallel XVS type for a given PAD type. Normally, it is safe to follow the PAD type directly, but older versions of the compiler have a bug that causes the offset of its "F" field to be wrong. Following that field in that case would lead to incorrect results, but this can be worked around by ignoring the PAD type and using the associated XVS type instead. Set to True if the debugger should trust the contents of PAD types. Otherwise, ignore the PAD type if there is a parallel XVS type. */ static bool trust_pad_over_xvs = true; /* True if TYPE is a struct type introduced by the compiler to force the alignment of a value. Such types have a single field with a distinctive name. */ int ada_is_aligner_type (struct type *type) { type = ada_check_typedef (type); if (!trust_pad_over_xvs && ada_find_parallel_type (type, "___XVS") != NULL) return 0; return (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1 && strcmp (TYPE_FIELD_NAME (type, 0), "F") == 0); } /* If there is an ___XVS-convention type parallel to SUBTYPE, return the parallel type. */ struct type * ada_get_base_type (struct type *raw_type) { struct type *real_type_namer; struct type *raw_real_type; if (raw_type == NULL || TYPE_CODE (raw_type) != TYPE_CODE_STRUCT) return raw_type; if (ada_is_aligner_type (raw_type)) /* The encoding specifies that we should always use the aligner type. So, even if this aligner type has an associated XVS type, we should simply ignore it. According to the compiler gurus, an XVS type parallel to an aligner type may exist because of a stabs limitation. In stabs, aligner types are empty because the field has a variable-sized type, and thus cannot actually be used as an aligner type. As a result, we need the associated parallel XVS type to decode the type. Since the policy in the compiler is to not change the internal representation based on the debugging info format, we sometimes end up having a redundant XVS type parallel to the aligner type. */ return raw_type; real_type_namer = ada_find_parallel_type (raw_type, "___XVS"); if (real_type_namer == NULL || TYPE_CODE (real_type_namer) != TYPE_CODE_STRUCT || TYPE_NFIELDS (real_type_namer) != 1) return raw_type; if (TYPE_CODE (TYPE_FIELD_TYPE (real_type_namer, 0)) != TYPE_CODE_REF) { /* This is an older encoding form where the base type needs to be looked up by name. We prefer the newer encoding because it is more efficient. */ raw_real_type = ada_find_any_type (TYPE_FIELD_NAME (real_type_namer, 0)); if (raw_real_type == NULL) return raw_type; else return raw_real_type; } /* The field in our XVS type is a reference to the base type. */ return TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (real_type_namer, 0)); } /* The type of value designated by TYPE, with all aligners removed. */ struct type * ada_aligned_type (struct type *type) { if (ada_is_aligner_type (type)) return ada_aligned_type (TYPE_FIELD_TYPE (type, 0)); else return ada_get_base_type (type); } /* The address of the aligned value in an object at address VALADDR having type TYPE. Assumes ada_is_aligner_type (TYPE). */ const gdb_byte * ada_aligned_value_addr (struct type *type, const gdb_byte *valaddr) { if (ada_is_aligner_type (type)) return ada_aligned_value_addr (TYPE_FIELD_TYPE (type, 0), valaddr + TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT); else return valaddr; } /* The printed representation of an enumeration literal with encoded name NAME. The value is good to the next call of ada_enum_name. */ const char * ada_enum_name (const char *name) { static char *result; static size_t result_len = 0; const char *tmp; /* First, unqualify the enumeration name: 1. Search for the last '.' character. If we find one, then skip all the preceding characters, the unqualified name starts right after that dot. 2. Otherwise, we may be debugging on a target where the compiler translates dots into "__". Search forward for double underscores, but stop searching when we hit an overloading suffix, which is of the form "__" followed by digits. */ tmp = strrchr (name, '.'); if (tmp != NULL) name = tmp + 1; else { while ((tmp = strstr (name, "__")) != NULL) { if (isdigit (tmp[2])) break; else name = tmp + 2; } } if (name[0] == 'Q') { int v; if (name[1] == 'U' || name[1] == 'W') { if (sscanf (name + 2, "%x", &v) != 1) return name; } else if (((name[1] >= '0' && name[1] <= '9') || (name[1] >= 'a' && name[1] <= 'z')) && name[2] == '\0') { GROW_VECT (result, result_len, 4); xsnprintf (result, result_len, "'%c'", name[1]); return result; } else return name; GROW_VECT (result, result_len, 16); if (isascii (v) && isprint (v)) xsnprintf (result, result_len, "'%c'", v); else if (name[1] == 'U') xsnprintf (result, result_len, "[\"%02x\"]", v); else xsnprintf (result, result_len, "[\"%04x\"]", v); return result; } else { tmp = strstr (name, "__"); if (tmp == NULL) tmp = strstr (name, "$"); if (tmp != NULL) { GROW_VECT (result, result_len, tmp - name + 1); strncpy (result, name, tmp - name); result[tmp - name] = '\0'; return result; } return name; } } /* Evaluate the subexpression of EXP starting at *POS as for evaluate_type, updating *POS to point just past the evaluated expression. */ static struct value * evaluate_subexp_type (struct expression *exp, int *pos) { return evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); } /* If VAL is wrapped in an aligner or subtype wrapper, return the value it wraps. */ static struct value * unwrap_value (struct value *val) { struct type *type = ada_check_typedef (value_type (val)); if (ada_is_aligner_type (type)) { struct value *v = ada_value_struct_elt (val, "F", 0); struct type *val_type = ada_check_typedef (value_type (v)); if (ada_type_name (val_type) == NULL) TYPE_NAME (val_type) = ada_type_name (type); return unwrap_value (v); } else { struct type *raw_real_type = ada_check_typedef (ada_get_base_type (type)); /* If there is no parallel XVS or XVE type, then the value is already unwrapped. Return it without further modification. */ if ((type == raw_real_type) && ada_find_parallel_type (type, "___XVE") == NULL) return val; return coerce_unspec_val_to_type (val, ada_to_fixed_type (raw_real_type, 0, value_address (val), NULL, 1)); } } static struct value * cast_from_fixed (struct type *type, struct value *arg) { struct value *scale = ada_scaling_factor (value_type (arg)); arg = value_cast (value_type (scale), arg); arg = value_binop (arg, scale, BINOP_MUL); return value_cast (type, arg); } static struct value * cast_to_fixed (struct type *type, struct value *arg) { if (type == value_type (arg)) return arg; struct value *scale = ada_scaling_factor (type); if (ada_is_fixed_point_type (value_type (arg))) arg = cast_from_fixed (value_type (scale), arg); else arg = value_cast (value_type (scale), arg); arg = value_binop (arg, scale, BINOP_DIV); return value_cast (type, arg); } /* Given two array types T1 and T2, return nonzero iff both arrays contain the same number of elements. */ static int ada_same_array_size_p (struct type *t1, struct type *t2) { LONGEST lo1, hi1, lo2, hi2; /* Get the array bounds in order to verify that the size of the two arrays match. */ if (!get_array_bounds (t1, &lo1, &hi1) || !get_array_bounds (t2, &lo2, &hi2)) error (_("unable to determine array bounds")); /* To make things easier for size comparison, normalize a bit the case of empty arrays by making sure that the difference between upper bound and lower bound is always -1. */ if (lo1 > hi1) hi1 = lo1 - 1; if (lo2 > hi2) hi2 = lo2 - 1; return (hi1 - lo1 == hi2 - lo2); } /* Assuming that VAL is an array of integrals, and TYPE represents an array with the same number of elements, but with wider integral elements, return an array "casted" to TYPE. In practice, this means that the returned array is built by casting each element of the original array into TYPE's (wider) element type. */ static struct value * ada_promote_array_of_integrals (struct type *type, struct value *val) { struct type *elt_type = TYPE_TARGET_TYPE (type); LONGEST lo, hi; struct value *res; LONGEST i; /* Verify that both val and type are arrays of scalars, and that the size of val's elements is smaller than the size of type's element. */ gdb_assert (TYPE_CODE (type) == TYPE_CODE_ARRAY); gdb_assert (is_integral_type (TYPE_TARGET_TYPE (type))); gdb_assert (TYPE_CODE (value_type (val)) == TYPE_CODE_ARRAY); gdb_assert (is_integral_type (TYPE_TARGET_TYPE (value_type (val)))); gdb_assert (TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > TYPE_LENGTH (TYPE_TARGET_TYPE (value_type (val)))); if (!get_array_bounds (type, &lo, &hi)) error (_("unable to determine array bounds")); res = allocate_value (type); /* Promote each array element. */ for (i = 0; i < hi - lo + 1; i++) { struct value *elt = value_cast (elt_type, value_subscript (val, lo + i)); memcpy (value_contents_writeable (res) + (i * TYPE_LENGTH (elt_type)), value_contents_all (elt), TYPE_LENGTH (elt_type)); } return res; } /* Coerce VAL as necessary for assignment to an lval of type TYPE, and return the converted value. */ static struct value * coerce_for_assign (struct type *type, struct value *val) { struct type *type2 = value_type (val); if (type == type2) return val; type2 = ada_check_typedef (type2); type = ada_check_typedef (type); if (TYPE_CODE (type2) == TYPE_CODE_PTR && TYPE_CODE (type) == TYPE_CODE_ARRAY) { val = ada_value_ind (val); type2 = value_type (val); } if (TYPE_CODE (type2) == TYPE_CODE_ARRAY && TYPE_CODE (type) == TYPE_CODE_ARRAY) { if (!ada_same_array_size_p (type, type2)) error (_("cannot assign arrays of different length")); if (is_integral_type (TYPE_TARGET_TYPE (type)) && is_integral_type (TYPE_TARGET_TYPE (type2)) && TYPE_LENGTH (TYPE_TARGET_TYPE (type2)) < TYPE_LENGTH (TYPE_TARGET_TYPE (type))) { /* Allow implicit promotion of the array elements to a wider type. */ return ada_promote_array_of_integrals (type, val); } if (TYPE_LENGTH (TYPE_TARGET_TYPE (type2)) != TYPE_LENGTH (TYPE_TARGET_TYPE (type))) error (_("Incompatible types in assignment")); deprecated_set_value_type (val, type); } return val; } static struct value * ada_value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op) { struct value *val; struct type *type1, *type2; LONGEST v, v1, v2; arg1 = coerce_ref (arg1); arg2 = coerce_ref (arg2); type1 = get_base_type (ada_check_typedef (value_type (arg1))); type2 = get_base_type (ada_check_typedef (value_type (arg2))); if (TYPE_CODE (type1) != TYPE_CODE_INT || TYPE_CODE (type2) != TYPE_CODE_INT) return value_binop (arg1, arg2, op); switch (op) { case BINOP_MOD: case BINOP_DIV: case BINOP_REM: break; default: return value_binop (arg1, arg2, op); } v2 = value_as_long (arg2); if (v2 == 0) error (_("second operand of %s must not be zero."), op_string (op)); if (TYPE_UNSIGNED (type1) || op == BINOP_MOD) return value_binop (arg1, arg2, op); v1 = value_as_long (arg1); switch (op) { case BINOP_DIV: v = v1 / v2; if (!TRUNCATION_TOWARDS_ZERO && v1 * (v1 % v2) < 0) v += v > 0 ? -1 : 1; break; case BINOP_REM: v = v1 % v2; if (v * v1 < 0) v -= v2; break; default: /* Should not reach this point. */ v = 0; } val = allocate_value (type1); store_unsigned_integer (value_contents_raw (val), TYPE_LENGTH (value_type (val)), type_byte_order (type1), v); return val; } static int ada_value_equal (struct value *arg1, struct value *arg2) { if (ada_is_direct_array_type (value_type (arg1)) || ada_is_direct_array_type (value_type (arg2))) { struct type *arg1_type, *arg2_type; /* Automatically dereference any array reference before we attempt to perform the comparison. */ arg1 = ada_coerce_ref (arg1); arg2 = ada_coerce_ref (arg2); arg1 = ada_coerce_to_simple_array (arg1); arg2 = ada_coerce_to_simple_array (arg2); arg1_type = ada_check_typedef (value_type (arg1)); arg2_type = ada_check_typedef (value_type (arg2)); if (TYPE_CODE (arg1_type) != TYPE_CODE_ARRAY || TYPE_CODE (arg2_type) != TYPE_CODE_ARRAY) error (_("Attempt to compare array with non-array")); /* FIXME: The following works only for types whose representations use all bits (no padding or undefined bits) and do not have user-defined equality. */ return (TYPE_LENGTH (arg1_type) == TYPE_LENGTH (arg2_type) && memcmp (value_contents (arg1), value_contents (arg2), TYPE_LENGTH (arg1_type)) == 0); } return value_equal (arg1, arg2); } /* Total number of component associations in the aggregate starting at index PC in EXP. Assumes that index PC is the start of an OP_AGGREGATE. */ static int num_component_specs (struct expression *exp, int pc) { int n, m, i; m = exp->elts[pc + 1].longconst; pc += 3; n = 0; for (i = 0; i < m; i += 1) { switch (exp->elts[pc].opcode) { default: n += 1; break; case OP_CHOICES: n += exp->elts[pc + 1].longconst; break; } ada_evaluate_subexp (NULL, exp, &pc, EVAL_SKIP); } return n; } /* Assign the result of evaluating EXP starting at *POS to the INDEXth component of LHS (a simple array or a record), updating *POS past the expression, assuming that LHS is contained in CONTAINER. Does not modify the inferior's memory, nor does it modify LHS (unless LHS == CONTAINER). */ static void assign_component (struct value *container, struct value *lhs, LONGEST index, struct expression *exp, int *pos) { struct value *mark = value_mark (); struct value *elt; struct type *lhs_type = check_typedef (value_type (lhs)); if (TYPE_CODE (lhs_type) == TYPE_CODE_ARRAY) { struct type *index_type = builtin_type (exp->gdbarch)->builtin_int; struct value *index_val = value_from_longest (index_type, index); elt = unwrap_value (ada_value_subscript (lhs, 1, &index_val)); } else { elt = ada_index_struct_field (index, lhs, 0, value_type (lhs)); elt = ada_to_fixed_value (elt); } if (exp->elts[*pos].opcode == OP_AGGREGATE) assign_aggregate (container, elt, exp, pos, EVAL_NORMAL); else value_assign_to_component (container, elt, ada_evaluate_subexp (NULL, exp, pos, EVAL_NORMAL)); value_free_to_mark (mark); } /* Assuming that LHS represents an lvalue having a record or array type, and EXP->ELTS[*POS] is an OP_AGGREGATE, evaluate an assignment of that aggregate's value to LHS, advancing *POS past the aggregate. NOSIDE is as for evaluate_subexp. CONTAINER is an lvalue containing LHS (possibly LHS itself). Does not modify the inferior's memory, nor does it modify the contents of LHS (unless == CONTAINER). Returns the modified CONTAINER. */ static struct value * assign_aggregate (struct value *container, struct value *lhs, struct expression *exp, int *pos, enum noside noside) { struct type *lhs_type; int n = exp->elts[*pos+1].longconst; LONGEST low_index, high_index; int num_specs; LONGEST *indices; int max_indices, num_indices; int i; *pos += 3; if (noside != EVAL_NORMAL) { for (i = 0; i < n; i += 1) ada_evaluate_subexp (NULL, exp, pos, noside); return container; } container = ada_coerce_ref (container); if (ada_is_direct_array_type (value_type (container))) container = ada_coerce_to_simple_array (container); lhs = ada_coerce_ref (lhs); if (!deprecated_value_modifiable (lhs)) error (_("Left operand of assignment is not a modifiable lvalue.")); lhs_type = check_typedef (value_type (lhs)); if (ada_is_direct_array_type (lhs_type)) { lhs = ada_coerce_to_simple_array (lhs); lhs_type = check_typedef (value_type (lhs)); low_index = TYPE_ARRAY_LOWER_BOUND_VALUE (lhs_type); high_index = TYPE_ARRAY_UPPER_BOUND_VALUE (lhs_type); } else if (TYPE_CODE (lhs_type) == TYPE_CODE_STRUCT) { low_index = 0; high_index = num_visible_fields (lhs_type) - 1; } else error (_("Left-hand side must be array or record.")); num_specs = num_component_specs (exp, *pos - 3); max_indices = 4 * num_specs + 4; indices = XALLOCAVEC (LONGEST, max_indices); indices[0] = indices[1] = low_index - 1; indices[2] = indices[3] = high_index + 1; num_indices = 4; for (i = 0; i < n; i += 1) { switch (exp->elts[*pos].opcode) { case OP_CHOICES: aggregate_assign_from_choices (container, lhs, exp, pos, indices, &num_indices, max_indices, low_index, high_index); break; case OP_POSITIONAL: aggregate_assign_positional (container, lhs, exp, pos, indices, &num_indices, max_indices, low_index, high_index); break; case OP_OTHERS: if (i != n-1) error (_("Misplaced 'others' clause")); aggregate_assign_others (container, lhs, exp, pos, indices, num_indices, low_index, high_index); break; default: error (_("Internal error: bad aggregate clause")); } } return container; } /* Assign into the component of LHS indexed by the OP_POSITIONAL construct at *POS, updating *POS past the construct, given that the positions are relative to lower bound LOW, where HIGH is the upper bound. Record the position in INDICES[0 .. MAX_INDICES-1] updating *NUM_INDICES as needed. CONTAINER is as for assign_aggregate. */ static void aggregate_assign_positional (struct value *container, struct value *lhs, struct expression *exp, int *pos, LONGEST *indices, int *num_indices, int max_indices, LONGEST low, LONGEST high) { LONGEST ind = longest_to_int (exp->elts[*pos + 1].longconst) + low; if (ind - 1 == high) warning (_("Extra components in aggregate ignored.")); if (ind <= high) { add_component_interval (ind, ind, indices, num_indices, max_indices); *pos += 3; assign_component (container, lhs, ind, exp, pos); } else ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); } /* Assign into the components of LHS indexed by the OP_CHOICES construct at *POS, updating *POS past the construct, given that the allowable indices are LOW..HIGH. Record the indices assigned to in INDICES[0 .. MAX_INDICES-1], updating *NUM_INDICES as needed. CONTAINER is as for assign_aggregate. */ static void aggregate_assign_from_choices (struct value *container, struct value *lhs, struct expression *exp, int *pos, LONGEST *indices, int *num_indices, int max_indices, LONGEST low, LONGEST high) { int j; int n_choices = longest_to_int (exp->elts[*pos+1].longconst); int choice_pos, expr_pc; int is_array = ada_is_direct_array_type (value_type (lhs)); choice_pos = *pos += 3; for (j = 0; j < n_choices; j += 1) ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); expr_pc = *pos; ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); for (j = 0; j < n_choices; j += 1) { LONGEST lower, upper; enum exp_opcode op = exp->elts[choice_pos].opcode; if (op == OP_DISCRETE_RANGE) { choice_pos += 1; lower = value_as_long (ada_evaluate_subexp (NULL, exp, pos, EVAL_NORMAL)); upper = value_as_long (ada_evaluate_subexp (NULL, exp, pos, EVAL_NORMAL)); } else if (is_array) { lower = value_as_long (ada_evaluate_subexp (NULL, exp, &choice_pos, EVAL_NORMAL)); upper = lower; } else { int ind; const char *name; switch (op) { case OP_NAME: name = &exp->elts[choice_pos + 2].string; break; case OP_VAR_VALUE: name = exp->elts[choice_pos + 2].symbol->natural_name (); break; default: error (_("Invalid record component association.")); } ada_evaluate_subexp (NULL, exp, &choice_pos, EVAL_SKIP); ind = 0; if (! find_struct_field (name, value_type (lhs), 0, NULL, NULL, NULL, NULL, &ind)) error (_("Unknown component name: %s."), name); lower = upper = ind; } if (lower <= upper && (lower < low || upper > high)) error (_("Index in component association out of bounds.")); add_component_interval (lower, upper, indices, num_indices, max_indices); while (lower <= upper) { int pos1; pos1 = expr_pc; assign_component (container, lhs, lower, exp, &pos1); lower += 1; } } } /* Assign the value of the expression in the OP_OTHERS construct in EXP at *POS into the components of LHS indexed from LOW .. HIGH that have not been previously assigned. The index intervals already assigned are in INDICES[0 .. NUM_INDICES-1]. Updates *POS to after the OP_OTHERS clause. CONTAINER is as for assign_aggregate. */ static void aggregate_assign_others (struct value *container, struct value *lhs, struct expression *exp, int *pos, LONGEST *indices, int num_indices, LONGEST low, LONGEST high) { int i; int expr_pc = *pos + 1; for (i = 0; i < num_indices - 2; i += 2) { LONGEST ind; for (ind = indices[i + 1] + 1; ind < indices[i + 2]; ind += 1) { int localpos; localpos = expr_pc; assign_component (container, lhs, ind, exp, &localpos); } } ada_evaluate_subexp (NULL, exp, pos, EVAL_SKIP); } /* Add the interval [LOW .. HIGH] to the sorted set of intervals [ INDICES[0] .. INDICES[1] ],..., [ INDICES[*SIZE-2] .. INDICES[*SIZE-1] ], modifying *SIZE as needed. It is an error if *SIZE exceeds MAX_SIZE. The resulting intervals do not overlap. */ static void add_component_interval (LONGEST low, LONGEST high, LONGEST* indices, int *size, int max_size) { int i, j; for (i = 0; i < *size; i += 2) { if (high >= indices[i] && low <= indices[i + 1]) { int kh; for (kh = i + 2; kh < *size; kh += 2) if (high < indices[kh]) break; if (low < indices[i]) indices[i] = low; indices[i + 1] = indices[kh - 1]; if (high > indices[i + 1]) indices[i + 1] = high; memcpy (indices + i + 2, indices + kh, *size - kh); *size -= kh - i - 2; return; } else if (high < indices[i]) break; } if (*size == max_size) error (_("Internal error: miscounted aggregate components.")); *size += 2; for (j = *size-1; j >= i+2; j -= 1) indices[j] = indices[j - 2]; indices[i] = low; indices[i + 1] = high; } /* Perform and Ada cast of ARG2 to type TYPE if the type of ARG2 is different. */ static struct value * ada_value_cast (struct type *type, struct value *arg2) { if (type == ada_check_typedef (value_type (arg2))) return arg2; if (ada_is_fixed_point_type (type)) return cast_to_fixed (type, arg2); if (ada_is_fixed_point_type (value_type (arg2))) return cast_from_fixed (type, arg2); return value_cast (type, arg2); } /* Evaluating Ada expressions, and printing their result. ------------------------------------------------------ 1. Introduction: ---------------- We usually evaluate an Ada expression in order to print its value. We also evaluate an expression in order to print its type, which happens during the EVAL_AVOID_SIDE_EFFECTS phase of the evaluation, but we'll focus mostly on the EVAL_NORMAL phase. In practice, the EVAL_AVOID_SIDE_EFFECTS phase allows us to simplify certain aspects of the evaluation compared to the EVAL_NORMAL, but is otherwise very similar. Evaluating expressions is a little more complicated for Ada entities than it is for entities in languages such as C. The main reason for this is that Ada provides types whose definition might be dynamic. One example of such types is variant records. Or another example would be an array whose bounds can only be known at run time. The following description is a general guide as to what should be done (and what should NOT be done) in order to evaluate an expression involving such types, and when. This does not cover how the semantic information is encoded by GNAT as this is covered separatly. For the document used as the reference for the GNAT encoding, see exp_dbug.ads in the GNAT sources. Ideally, we should embed each part of this description next to its associated code. Unfortunately, the amount of code is so vast right now that it's hard to see whether the code handling a particular situation might be duplicated or not. One day, when the code is cleaned up, this guide might become redundant with the comments inserted in the code, and we might want to remove it. 2. ``Fixing'' an Entity, the Simple Case: ----------------------------------------- When evaluating Ada expressions, the tricky issue is that they may reference entities whose type contents and size are not statically known. Consider for instance a variant record: type Rec (Empty : Boolean := True) is record case Empty is when True => null; when False => Value : Integer; end case; end record; Yes : Rec := (Empty => False, Value => 1); No : Rec := (empty => True); The size and contents of that record depends on the value of the descriminant (Rec.Empty). At this point, neither the debugging information nor the associated type structure in GDB are able to express such dynamic types. So what the debugger does is to create "fixed" versions of the type that applies to the specific object. We also informally refer to this operation as "fixing" an object, which means creating its associated fixed type. Example: when printing the value of variable "Yes" above, its fixed type would look like this: type Rec is record Empty : Boolean; Value : Integer; end record; On the other hand, if we printed the value of "No", its fixed type would become: type Rec is record Empty : Boolean; end record; Things become a little more complicated when trying to fix an entity with a dynamic type that directly contains another dynamic type, such as an array of variant records, for instance. There are two possible cases: Arrays, and records. 3. ``Fixing'' Arrays: --------------------- The type structure in GDB describes an array in terms of its bounds, and the type of its elements. By design, all elements in the array have the same type and we cannot represent an array of variant elements using the current type structure in GDB. When fixing an array, we cannot fix the array element, as we would potentially need one fixed type per element of the array. As a result, the best we can do when fixing an array is to produce an array whose bounds and size are correct (allowing us to read it from memory), but without having touched its element type. Fixing each element will be done later, when (if) necessary. Arrays are a little simpler to handle than records, because the same amount of memory is allocated for each element of the array, even if the amount of space actually used by each element differs from element to element. Consider for instance the following array of type Rec: type Rec_Array is array (1 .. 2) of Rec; The actual amount of memory occupied by each element might be different from element to element, depending on the value of their discriminant. But the amount of space reserved for each element in the array remains fixed regardless. So we simply need to compute that size using the debugging information available, from which we can then determine the array size (we multiply the number of elements of the array by the size of each element). The simplest case is when we have an array of a constrained element type. For instance, consider the following type declarations: type Bounded_String (Max_Size : Integer) is Length : Integer; Buffer : String (1 .. Max_Size); end record; type Bounded_String_Array is array (1 ..2) of Bounded_String (80); In this case, the compiler describes the array as an array of variable-size elements (identified by its XVS suffix) for which the size can be read in the parallel XVZ variable. In the case of an array of an unconstrained element type, the compiler wraps the array element inside a private PAD type. This type should not be shown to the user, and must be "unwrap"'ed before printing. Note that we also use the adjective "aligner" in our code to designate these wrapper types. In some cases, the size allocated for each element is statically known. In that case, the PAD type already has the correct size, and the array element should remain unfixed. But there are cases when this size is not statically known. For instance, assuming that "Five" is an integer variable: type Dynamic is array (1 .. Five) of Integer; type Wrapper (Has_Length : Boolean := False) is record Data : Dynamic; case Has_Length is when True => Length : Integer; when False => null; end case; end record; type Wrapper_Array is array (1 .. 2) of Wrapper; Hello : Wrapper_Array := (others => (Has_Length => True, Data => (others => 17), Length => 1)); The debugging info would describe variable Hello as being an array of a PAD type. The size of that PAD type is not statically known, but can be determined using a parallel XVZ variable. In that case, a copy of the PAD type with the correct size should be used for the fixed array. 3. ``Fixing'' record type objects: ---------------------------------- Things are slightly different from arrays in the case of dynamic record types. In this case, in order to compute the associated fixed type, we need to determine the size and offset of each of its components. This, in turn, requires us to compute the fixed type of each of these components. Consider for instance the example: type Bounded_String (Max_Size : Natural) is record Str : String (1 .. Max_Size); Length : Natural; end record; My_String : Bounded_String (Max_Size => 10); In that case, the position of field "Length" depends on the size of field Str, which itself depends on the value of the Max_Size discriminant. In order to fix the type of variable My_String, we need to fix the type of field Str. Therefore, fixing a variant record requires us to fix each of its components. However, if a component does not have a dynamic size, the component should not be fixed. In particular, fields that use a PAD type should not fixed. Here is an example where this might happen (assuming type Rec above): type Container (Big : Boolean) is record First : Rec; After : Integer; case Big is when True => Another : Integer; when False => null; end case; end record; My_Container : Container := (Big => False, First => (Empty => True), After => 42); In that example, the compiler creates a PAD type for component First, whose size is constant, and then positions the component After just right after it. The offset of component After is therefore constant in this case. The debugger computes the position of each field based on an algorithm that uses, among other things, the actual position and size of the field preceding it. Let's now imagine that the user is trying to print the value of My_Container. If the type fixing was recursive, we would end up computing the offset of field After based on the size of the fixed version of field First. And since in our example First has only one actual field, the size of the fixed type is actually smaller than the amount of space allocated to that field, and thus we would compute the wrong offset of field After. To make things more complicated, we need to watch out for dynamic components of variant records (identified by the ___XVL suffix in the component name). Even if the target type is a PAD type, the size of that type might not be statically known. So the PAD type needs to be unwrapped and the resulting type needs to be fixed. Otherwise, we might end up with the wrong size for our component. This can be observed with the following type declarations: type Octal is new Integer range 0 .. 7; type Octal_Array is array (Positive range <>) of Octal; pragma Pack (Octal_Array); type Octal_Buffer (Size : Positive) is record Buffer : Octal_Array (1 .. Size); Length : Integer; end record; In that case, Buffer is a PAD type whose size is unset and needs to be computed by fixing the unwrapped type. 4. When to ``Fix'' un-``Fixed'' sub-elements of an entity: ---------------------------------------------------------- Lastly, when should the sub-elements of an entity that remained unfixed thus far, be actually fixed? The answer is: Only when referencing that element. For instance when selecting one component of a record, this specific component should be fixed at that point in time. Or when printing the value of a record, each component should be fixed before its value gets printed. Similarly for arrays, the element of the array should be fixed when printing each element of the array, or when extracting one element out of that array. On the other hand, fixing should not be performed on the elements when taking a slice of an array! Note that one of the side effects of miscomputing the offset and size of each field is that we end up also miscomputing the size of the containing type. This can have adverse results when computing the value of an entity. GDB fetches the value of an entity based on the size of its type, and thus a wrong size causes GDB to fetch the wrong amount of memory. In the case where the computed size is too small, GDB fetches too little data to print the value of our entity. Results in this case are unpredictable, as we usually read past the buffer containing the data =:-o. */ /* Evaluate a subexpression of EXP, at index *POS, and return a value for that subexpression cast to TO_TYPE. Advance *POS over the subexpression. */ static value * ada_evaluate_subexp_for_cast (expression *exp, int *pos, enum noside noside, struct type *to_type) { int pc = *pos; if (exp->elts[pc].opcode == OP_VAR_MSYM_VALUE || exp->elts[pc].opcode == OP_VAR_VALUE) { (*pos) += 4; value *val; if (exp->elts[pc].opcode == OP_VAR_MSYM_VALUE) { if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (to_type, not_lval); val = evaluate_var_msym_value (noside, exp->elts[pc + 1].objfile, exp->elts[pc + 2].msymbol); } else val = evaluate_var_value (noside, exp->elts[pc + 1].block, exp->elts[pc + 2].symbol); if (noside == EVAL_SKIP) return eval_skip_value (exp); val = ada_value_cast (to_type, val); /* Follow the Ada language semantics that do not allow taking an address of the result of a cast (view conversion in Ada). */ if (VALUE_LVAL (val) == lval_memory) { if (value_lazy (val)) value_fetch_lazy (val); VALUE_LVAL (val) = not_lval; } return val; } value *val = evaluate_subexp (to_type, exp, pos, noside); if (noside == EVAL_SKIP) return eval_skip_value (exp); return ada_value_cast (to_type, val); } /* Implement the evaluate_exp routine in the exp_descriptor structure for the Ada language. */ static struct value * ada_evaluate_subexp (struct type *expect_type, struct expression *exp, int *pos, enum noside noside) { enum exp_opcode op; int tem; int pc; int preeval_pos; struct value *arg1 = NULL, *arg2 = NULL, *arg3; struct type *type; int nargs, oplen; struct value **argvec; pc = *pos; *pos += 1; op = exp->elts[pc].opcode; switch (op) { default: *pos -= 1; arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside); if (noside == EVAL_NORMAL) arg1 = unwrap_value (arg1); /* If evaluating an OP_FLOAT and an EXPECT_TYPE was provided, then we need to perform the conversion manually, because evaluate_subexp_standard doesn't do it. This conversion is necessary in Ada because the different kinds of float/fixed types in Ada have different representations. Similarly, we need to perform the conversion from OP_LONG ourselves. */ if ((op == OP_FLOAT || op == OP_LONG) && expect_type != NULL) arg1 = ada_value_cast (expect_type, arg1); return arg1; case OP_STRING: { struct value *result; *pos -= 1; result = evaluate_subexp_standard (expect_type, exp, pos, noside); /* The result type will have code OP_STRING, bashed there from OP_ARRAY. Bash it back. */ if (TYPE_CODE (value_type (result)) == TYPE_CODE_STRING) TYPE_CODE (value_type (result)) = TYPE_CODE_ARRAY; return result; } case UNOP_CAST: (*pos) += 2; type = exp->elts[pc + 1].type; return ada_evaluate_subexp_for_cast (exp, pos, noside, type); case UNOP_QUAL: (*pos) += 2; type = exp->elts[pc + 1].type; return ada_evaluate_subexp (type, exp, pos, noside); case BINOP_ASSIGN: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (exp->elts[*pos].opcode == OP_AGGREGATE) { arg1 = assign_aggregate (arg1, arg1, exp, pos, noside); if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) return arg1; return ada_value_assign (arg1, arg1); } /* Force the evaluation of the rhs ARG2 to the type of the lhs ARG1, except if the lhs of our assignment is a convenience variable. In the case of assigning to a convenience variable, the lhs should be exactly the result of the evaluation of the rhs. */ type = value_type (arg1); if (VALUE_LVAL (arg1) == lval_internalvar) type = NULL; arg2 = evaluate_subexp (type, exp, pos, noside); if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) return arg1; if (VALUE_LVAL (arg1) == lval_internalvar) { /* Nothing. */ } else if (ada_is_fixed_point_type (value_type (arg1))) arg2 = cast_to_fixed (value_type (arg1), arg2); else if (ada_is_fixed_point_type (value_type (arg2))) error (_("Fixed-point values must be assigned to fixed-point variables")); else arg2 = coerce_for_assign (value_type (arg1), arg2); return ada_value_assign (arg1, arg2); case BINOP_ADD: arg1 = evaluate_subexp_with_coercion (exp, pos, noside); arg2 = evaluate_subexp_with_coercion (exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_PTR) return (value_from_longest (value_type (arg1), value_as_long (arg1) + value_as_long (arg2))); if (TYPE_CODE (value_type (arg2)) == TYPE_CODE_PTR) return (value_from_longest (value_type (arg2), value_as_long (arg1) + value_as_long (arg2))); if ((ada_is_fixed_point_type (value_type (arg1)) || ada_is_fixed_point_type (value_type (arg2))) && value_type (arg1) != value_type (arg2)) error (_("Operands of fixed-point addition must have the same type")); /* Do the addition, and cast the result to the type of the first argument. We cannot cast the result to a reference type, so if ARG1 is a reference type, find its underlying type. */ type = value_type (arg1); while (TYPE_CODE (type) == TYPE_CODE_REF) type = TYPE_TARGET_TYPE (type); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); return value_cast (type, value_binop (arg1, arg2, BINOP_ADD)); case BINOP_SUB: arg1 = evaluate_subexp_with_coercion (exp, pos, noside); arg2 = evaluate_subexp_with_coercion (exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_PTR) return (value_from_longest (value_type (arg1), value_as_long (arg1) - value_as_long (arg2))); if (TYPE_CODE (value_type (arg2)) == TYPE_CODE_PTR) return (value_from_longest (value_type (arg2), value_as_long (arg1) - value_as_long (arg2))); if ((ada_is_fixed_point_type (value_type (arg1)) || ada_is_fixed_point_type (value_type (arg2))) && value_type (arg1) != value_type (arg2)) error (_("Operands of fixed-point subtraction " "must have the same type")); /* Do the substraction, and cast the result to the type of the first argument. We cannot cast the result to a reference type, so if ARG1 is a reference type, find its underlying type. */ type = value_type (arg1); while (TYPE_CODE (type) == TYPE_CODE_REF) type = TYPE_TARGET_TYPE (type); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); return value_cast (type, value_binop (arg1, arg2, BINOP_SUB)); case BINOP_MUL: case BINOP_DIV: case BINOP_REM: case BINOP_MOD: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; else if (noside == EVAL_AVOID_SIDE_EFFECTS) { binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); return value_zero (value_type (arg1), not_lval); } else { type = builtin_type (exp->gdbarch)->builtin_double; if (ada_is_fixed_point_type (value_type (arg1))) arg1 = cast_from_fixed (type, arg1); if (ada_is_fixed_point_type (value_type (arg2))) arg2 = cast_from_fixed (type, arg2); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); return ada_value_binop (arg1, arg2, op); } case BINOP_EQUAL: case BINOP_NOTEQUAL: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; if (noside == EVAL_AVOID_SIDE_EFFECTS) tem = 0; else { binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); tem = ada_value_equal (arg1, arg2); } if (op == BINOP_NOTEQUAL) tem = !tem; type = language_bool_type (exp->language_defn, exp->gdbarch); return value_from_longest (type, (LONGEST) tem); case UNOP_NEG: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; else if (ada_is_fixed_point_type (value_type (arg1))) return value_cast (value_type (arg1), value_neg (arg1)); else { unop_promote (exp->language_defn, exp->gdbarch, &arg1); return value_neg (arg1); } case BINOP_LOGICAL_AND: case BINOP_LOGICAL_OR: case UNOP_LOGICAL_NOT: { struct value *val; *pos -= 1; val = evaluate_subexp_standard (expect_type, exp, pos, noside); type = language_bool_type (exp->language_defn, exp->gdbarch); return value_cast (type, val); } case BINOP_BITWISE_AND: case BINOP_BITWISE_IOR: case BINOP_BITWISE_XOR: { struct value *val; arg1 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); *pos = pc; val = evaluate_subexp_standard (expect_type, exp, pos, noside); return value_cast (value_type (arg1), val); } case OP_VAR_VALUE: *pos -= 1; if (noside == EVAL_SKIP) { *pos += 4; goto nosideret; } if (SYMBOL_DOMAIN (exp->elts[pc + 2].symbol) == UNDEF_DOMAIN) /* Only encountered when an unresolved symbol occurs in a context other than a function call, in which case, it is invalid. */ error (_("Unexpected unresolved symbol, %s, during evaluation"), exp->elts[pc + 2].symbol->print_name ()); if (noside == EVAL_AVOID_SIDE_EFFECTS) { type = static_unwrap_type (SYMBOL_TYPE (exp->elts[pc + 2].symbol)); /* Check to see if this is a tagged type. We also need to handle the case where the type is a reference to a tagged type, but we have to be careful to exclude pointers to tagged types. The latter should be shown as usual (as a pointer), whereas a reference should mostly be transparent to the user. */ if (ada_is_tagged_type (type, 0) || (TYPE_CODE (type) == TYPE_CODE_REF && ada_is_tagged_type (TYPE_TARGET_TYPE (type), 0))) { /* Tagged types are a little special in the fact that the real type is dynamic and can only be determined by inspecting the object's tag. This means that we need to get the object's value first (EVAL_NORMAL) and then extract the actual object type from its tag. Note that we cannot skip the final step where we extract the object type from its tag, because the EVAL_NORMAL phase results in dynamic components being resolved into fixed ones. This can cause problems when trying to print the type description of tagged types whose parent has a dynamic size: We use the type name of the "_parent" component in order to print the name of the ancestor type in the type description. If that component had a dynamic size, the resolution into a fixed type would result in the loss of that type name, thus preventing us from printing the name of the ancestor type in the type description. */ arg1 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL); if (TYPE_CODE (type) != TYPE_CODE_REF) { struct type *actual_type; actual_type = type_from_tag (ada_value_tag (arg1)); if (actual_type == NULL) /* If, for some reason, we were unable to determine the actual type from the tag, then use the static approximation that we just computed as a fallback. This can happen if the debugging information is incomplete, for instance. */ actual_type = type; return value_zero (actual_type, not_lval); } else { /* In the case of a ref, ada_coerce_ref takes care of determining the actual type. But the evaluation should return a ref as it should be valid to ask for its address; so rebuild a ref after coerce. */ arg1 = ada_coerce_ref (arg1); return value_ref (arg1, TYPE_CODE_REF); } } /* Records and unions for which GNAT encodings have been generated need to be statically fixed as well. Otherwise, non-static fixing produces a type where all dynamic properties are removed, which prevents "ptype" from being able to completely describe the type. For instance, a case statement in a variant record would be replaced by the relevant components based on the actual value of the discriminants. */ if ((TYPE_CODE (type) == TYPE_CODE_STRUCT && dynamic_template_type (type) != NULL) || (TYPE_CODE (type) == TYPE_CODE_UNION && ada_find_parallel_type (type, "___XVU") != NULL)) { *pos += 4; return value_zero (to_static_fixed_type (type), not_lval); } } arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside); return ada_to_fixed_value (arg1); case OP_FUNCALL: (*pos) += 2; /* Allocate arg vector, including space for the function to be called in argvec[0] and a terminating NULL. */ nargs = longest_to_int (exp->elts[pc + 1].longconst); argvec = XALLOCAVEC (struct value *, nargs + 2); if (exp->elts[*pos].opcode == OP_VAR_VALUE && SYMBOL_DOMAIN (exp->elts[pc + 5].symbol) == UNDEF_DOMAIN) error (_("Unexpected unresolved symbol, %s, during evaluation"), exp->elts[pc + 5].symbol->print_name ()); else { for (tem = 0; tem <= nargs; tem += 1) argvec[tem] = evaluate_subexp (NULL_TYPE, exp, pos, noside); argvec[tem] = 0; if (noside == EVAL_SKIP) goto nosideret; } if (ada_is_constrained_packed_array_type (desc_base_type (value_type (argvec[0])))) argvec[0] = ada_coerce_to_simple_array (argvec[0]); else if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_ARRAY && TYPE_FIELD_BITSIZE (value_type (argvec[0]), 0) != 0) /* This is a packed array that has already been fixed, and therefore already coerced to a simple array. Nothing further to do. */ ; else if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_REF) { /* Make sure we dereference references so that all the code below feels like it's really handling the referenced value. Wrapping types (for alignment) may be there, so make sure we strip them as well. */ argvec[0] = ada_to_fixed_value (coerce_ref (argvec[0])); } else if (TYPE_CODE (value_type (argvec[0])) == TYPE_CODE_ARRAY && VALUE_LVAL (argvec[0]) == lval_memory) argvec[0] = value_addr (argvec[0]); type = ada_check_typedef (value_type (argvec[0])); /* Ada allows us to implicitly dereference arrays when subscripting them. So, if this is an array typedef (encoding use for array access types encoded as fat pointers), strip it now. */ if (TYPE_CODE (type) == TYPE_CODE_TYPEDEF) type = ada_typedef_target_type (type); if (TYPE_CODE (type) == TYPE_CODE_PTR) { switch (TYPE_CODE (ada_check_typedef (TYPE_TARGET_TYPE (type)))) { case TYPE_CODE_FUNC: type = ada_check_typedef (TYPE_TARGET_TYPE (type)); break; case TYPE_CODE_ARRAY: break; case TYPE_CODE_STRUCT: if (noside != EVAL_AVOID_SIDE_EFFECTS) argvec[0] = ada_value_ind (argvec[0]); type = ada_check_typedef (TYPE_TARGET_TYPE (type)); break; default: error (_("cannot subscript or call something of type `%s'"), ada_type_name (value_type (argvec[0]))); break; } } switch (TYPE_CODE (type)) { case TYPE_CODE_FUNC: if (noside == EVAL_AVOID_SIDE_EFFECTS) { if (TYPE_TARGET_TYPE (type) == NULL) error_call_unknown_return_type (NULL); return allocate_value (TYPE_TARGET_TYPE (type)); } return call_function_by_hand (argvec[0], NULL, gdb::make_array_view (argvec + 1, nargs)); case TYPE_CODE_INTERNAL_FUNCTION: if (noside == EVAL_AVOID_SIDE_EFFECTS) /* We don't know anything about what the internal function might return, but we have to return something. */ return value_zero (builtin_type (exp->gdbarch)->builtin_int, not_lval); else return call_internal_function (exp->gdbarch, exp->language_defn, argvec[0], nargs, argvec + 1); case TYPE_CODE_STRUCT: { int arity; arity = ada_array_arity (type); type = ada_array_element_type (type, nargs); if (type == NULL) error (_("cannot subscript or call a record")); if (arity != nargs) error (_("wrong number of subscripts; expecting %d"), arity); if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (ada_aligned_type (type), lval_memory); return unwrap_value (ada_value_subscript (argvec[0], nargs, argvec + 1)); } case TYPE_CODE_ARRAY: if (noside == EVAL_AVOID_SIDE_EFFECTS) { type = ada_array_element_type (type, nargs); if (type == NULL) error (_("element type of array unknown")); else return value_zero (ada_aligned_type (type), lval_memory); } return unwrap_value (ada_value_subscript (ada_coerce_to_simple_array (argvec[0]), nargs, argvec + 1)); case TYPE_CODE_PTR: /* Pointer to array */ if (noside == EVAL_AVOID_SIDE_EFFECTS) { type = to_fixed_array_type (TYPE_TARGET_TYPE (type), NULL, 1); type = ada_array_element_type (type, nargs); if (type == NULL) error (_("element type of array unknown")); else return value_zero (ada_aligned_type (type), lval_memory); } return unwrap_value (ada_value_ptr_subscript (argvec[0], nargs, argvec + 1)); default: error (_("Attempt to index or call something other than an " "array or function")); } case TERNOP_SLICE: { struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside); struct value *low_bound_val = evaluate_subexp (NULL_TYPE, exp, pos, noside); struct value *high_bound_val = evaluate_subexp (NULL_TYPE, exp, pos, noside); LONGEST low_bound; LONGEST high_bound; low_bound_val = coerce_ref (low_bound_val); high_bound_val = coerce_ref (high_bound_val); low_bound = value_as_long (low_bound_val); high_bound = value_as_long (high_bound_val); if (noside == EVAL_SKIP) goto nosideret; /* If this is a reference to an aligner type, then remove all the aligners. */ if (TYPE_CODE (value_type (array)) == TYPE_CODE_REF && ada_is_aligner_type (TYPE_TARGET_TYPE (value_type (array)))) TYPE_TARGET_TYPE (value_type (array)) = ada_aligned_type (TYPE_TARGET_TYPE (value_type (array))); if (ada_is_constrained_packed_array_type (value_type (array))) error (_("cannot slice a packed array")); /* If this is a reference to an array or an array lvalue, convert to a pointer. */ if (TYPE_CODE (value_type (array)) == TYPE_CODE_REF || (TYPE_CODE (value_type (array)) == TYPE_CODE_ARRAY && VALUE_LVAL (array) == lval_memory)) array = value_addr (array); if (noside == EVAL_AVOID_SIDE_EFFECTS && ada_is_array_descriptor_type (ada_check_typedef (value_type (array)))) return empty_array (ada_type_of_array (array, 0), low_bound, high_bound); array = ada_coerce_to_simple_array_ptr (array); /* If we have more than one level of pointer indirection, dereference the value until we get only one level. */ while (TYPE_CODE (value_type (array)) == TYPE_CODE_PTR && (TYPE_CODE (TYPE_TARGET_TYPE (value_type (array))) == TYPE_CODE_PTR)) array = value_ind (array); /* Make sure we really do have an array type before going further, to avoid a SEGV when trying to get the index type or the target type later down the road if the debug info generated by the compiler is incorrect or incomplete. */ if (!ada_is_simple_array_type (value_type (array))) error (_("cannot take slice of non-array")); if (TYPE_CODE (ada_check_typedef (value_type (array))) == TYPE_CODE_PTR) { struct type *type0 = ada_check_typedef (value_type (array)); if (high_bound < low_bound || noside == EVAL_AVOID_SIDE_EFFECTS) return empty_array (TYPE_TARGET_TYPE (type0), low_bound, high_bound); else { struct type *arr_type0 = to_fixed_array_type (TYPE_TARGET_TYPE (type0), NULL, 1); return ada_value_slice_from_ptr (array, arr_type0, longest_to_int (low_bound), longest_to_int (high_bound)); } } else if (noside == EVAL_AVOID_SIDE_EFFECTS) return array; else if (high_bound < low_bound) return empty_array (value_type (array), low_bound, high_bound); else return ada_value_slice (array, longest_to_int (low_bound), longest_to_int (high_bound)); } case UNOP_IN_RANGE: (*pos) += 2; arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); type = check_typedef (exp->elts[pc + 1].type); if (noside == EVAL_SKIP) goto nosideret; switch (TYPE_CODE (type)) { default: lim_warning (_("Membership test incompletely implemented; " "always returns true")); type = language_bool_type (exp->language_defn, exp->gdbarch); return value_from_longest (type, (LONGEST) 1); case TYPE_CODE_RANGE: arg2 = value_from_longest (type, TYPE_LOW_BOUND (type)); arg3 = value_from_longest (type, TYPE_HIGH_BOUND (type)); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg3); type = language_bool_type (exp->language_defn, exp->gdbarch); return value_from_longest (type, (value_less (arg1, arg3) || value_equal (arg1, arg3)) && (value_less (arg2, arg1) || value_equal (arg2, arg1))); } case BINOP_IN_BOUNDS: (*pos) += 2; arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; if (noside == EVAL_AVOID_SIDE_EFFECTS) { type = language_bool_type (exp->language_defn, exp->gdbarch); return value_zero (type, not_lval); } tem = longest_to_int (exp->elts[pc + 1].longconst); type = ada_index_type (value_type (arg2), tem, "range"); if (!type) type = value_type (arg1); arg3 = value_from_longest (type, ada_array_bound (arg2, tem, 1)); arg2 = value_from_longest (type, ada_array_bound (arg2, tem, 0)); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg3); type = language_bool_type (exp->language_defn, exp->gdbarch); return value_from_longest (type, (value_less (arg1, arg3) || value_equal (arg1, arg3)) && (value_less (arg2, arg1) || value_equal (arg2, arg1))); case TERNOP_IN_RANGE: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); arg3 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg3); type = language_bool_type (exp->language_defn, exp->gdbarch); return value_from_longest (type, (value_less (arg1, arg3) || value_equal (arg1, arg3)) && (value_less (arg2, arg1) || value_equal (arg2, arg1))); case OP_ATR_FIRST: case OP_ATR_LAST: case OP_ATR_LENGTH: { struct type *type_arg; if (exp->elts[*pos].opcode == OP_TYPE) { evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); arg1 = NULL; type_arg = check_typedef (exp->elts[pc + 2].type); } else { arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); type_arg = NULL; } if (exp->elts[*pos].opcode != OP_LONG) error (_("Invalid operand to '%s"), ada_attribute_name (op)); tem = longest_to_int (exp->elts[*pos + 2].longconst); *pos += 4; if (noside == EVAL_SKIP) goto nosideret; else if (noside == EVAL_AVOID_SIDE_EFFECTS) { if (type_arg == NULL) type_arg = value_type (arg1); if (ada_is_constrained_packed_array_type (type_arg)) type_arg = decode_constrained_packed_array_type (type_arg); if (!discrete_type_p (type_arg)) { switch (op) { default: /* Should never happen. */ error (_("unexpected attribute encountered")); case OP_ATR_FIRST: case OP_ATR_LAST: type_arg = ada_index_type (type_arg, tem, ada_attribute_name (op)); break; case OP_ATR_LENGTH: type_arg = builtin_type (exp->gdbarch)->builtin_int; break; } } return value_zero (type_arg, not_lval); } else if (type_arg == NULL) { arg1 = ada_coerce_ref (arg1); if (ada_is_constrained_packed_array_type (value_type (arg1))) arg1 = ada_coerce_to_simple_array (arg1); if (op == OP_ATR_LENGTH) type = builtin_type (exp->gdbarch)->builtin_int; else { type = ada_index_type (value_type (arg1), tem, ada_attribute_name (op)); if (type == NULL) type = builtin_type (exp->gdbarch)->builtin_int; } switch (op) { default: /* Should never happen. */ error (_("unexpected attribute encountered")); case OP_ATR_FIRST: return value_from_longest (type, ada_array_bound (arg1, tem, 0)); case OP_ATR_LAST: return value_from_longest (type, ada_array_bound (arg1, tem, 1)); case OP_ATR_LENGTH: return value_from_longest (type, ada_array_length (arg1, tem)); } } else if (discrete_type_p (type_arg)) { struct type *range_type; const char *name = ada_type_name (type_arg); range_type = NULL; if (name != NULL && TYPE_CODE (type_arg) != TYPE_CODE_ENUM) range_type = to_fixed_range_type (type_arg, NULL); if (range_type == NULL) range_type = type_arg; switch (op) { default: error (_("unexpected attribute encountered")); case OP_ATR_FIRST: return value_from_longest (range_type, ada_discrete_type_low_bound (range_type)); case OP_ATR_LAST: return value_from_longest (range_type, ada_discrete_type_high_bound (range_type)); case OP_ATR_LENGTH: error (_("the 'length attribute applies only to array types")); } } else if (TYPE_CODE (type_arg) == TYPE_CODE_FLT) error (_("unimplemented type attribute")); else { LONGEST low, high; if (ada_is_constrained_packed_array_type (type_arg)) type_arg = decode_constrained_packed_array_type (type_arg); if (op == OP_ATR_LENGTH) type = builtin_type (exp->gdbarch)->builtin_int; else { type = ada_index_type (type_arg, tem, ada_attribute_name (op)); if (type == NULL) type = builtin_type (exp->gdbarch)->builtin_int; } switch (op) { default: error (_("unexpected attribute encountered")); case OP_ATR_FIRST: low = ada_array_bound_from_type (type_arg, tem, 0); return value_from_longest (type, low); case OP_ATR_LAST: high = ada_array_bound_from_type (type_arg, tem, 1); return value_from_longest (type, high); case OP_ATR_LENGTH: low = ada_array_bound_from_type (type_arg, tem, 0); high = ada_array_bound_from_type (type_arg, tem, 1); return value_from_longest (type, high - low + 1); } } } case OP_ATR_TAG: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (ada_tag_type (arg1), not_lval); return ada_value_tag (arg1); case OP_ATR_MIN: case OP_ATR_MAX: evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; else if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (value_type (arg1), not_lval); else { binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); return value_binop (arg1, arg2, op == OP_ATR_MIN ? BINOP_MIN : BINOP_MAX); } case OP_ATR_MODULUS: { struct type *type_arg = check_typedef (exp->elts[pc + 2].type); evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); if (noside == EVAL_SKIP) goto nosideret; if (!ada_is_modular_type (type_arg)) error (_("'modulus must be applied to modular type")); return value_from_longest (TYPE_TARGET_TYPE (type_arg), ada_modulus (type_arg)); } case OP_ATR_POS: evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; type = builtin_type (exp->gdbarch)->builtin_int; if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (type, not_lval); else return value_pos_atr (type, arg1); case OP_ATR_SIZE: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); type = value_type (arg1); /* If the argument is a reference, then dereference its type, since the user is really asking for the size of the actual object, not the size of the pointer. */ if (TYPE_CODE (type) == TYPE_CODE_REF) type = TYPE_TARGET_TYPE (type); if (noside == EVAL_SKIP) goto nosideret; else if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (builtin_type (exp->gdbarch)->builtin_int, not_lval); else return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, TARGET_CHAR_BIT * TYPE_LENGTH (type)); case OP_ATR_VAL: evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); type = exp->elts[pc + 2].type; if (noside == EVAL_SKIP) goto nosideret; else if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (type, not_lval); else return value_val_atr (type, arg1); case BINOP_EXP: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; else if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (value_type (arg1), not_lval); else { /* For integer exponentiation operations, only promote the first argument. */ if (is_integral_type (value_type (arg2))) unop_promote (exp->language_defn, exp->gdbarch, &arg1); else binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); return value_binop (arg1, arg2, op); } case UNOP_PLUS: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; else return arg1; case UNOP_ABS: arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; unop_promote (exp->language_defn, exp->gdbarch, &arg1); if (value_less (arg1, value_zero (value_type (arg1), not_lval))) return value_neg (arg1); else return arg1; case UNOP_IND: preeval_pos = *pos; arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; type = ada_check_typedef (value_type (arg1)); if (noside == EVAL_AVOID_SIDE_EFFECTS) { if (ada_is_array_descriptor_type (type)) /* GDB allows dereferencing GNAT array descriptors. */ { struct type *arrType = ada_type_of_array (arg1, 0); if (arrType == NULL) error (_("Attempt to dereference null array pointer.")); return value_at_lazy (arrType, 0); } else if (TYPE_CODE (type) == TYPE_CODE_PTR || TYPE_CODE (type) == TYPE_CODE_REF /* In C you can dereference an array to get the 1st elt. */ || TYPE_CODE (type) == TYPE_CODE_ARRAY) { /* As mentioned in the OP_VAR_VALUE case, tagged types can only be determined by inspecting the object's tag. This means that we need to evaluate completely the expression in order to get its type. */ if ((TYPE_CODE (type) == TYPE_CODE_REF || TYPE_CODE (type) == TYPE_CODE_PTR) && ada_is_tagged_type (TYPE_TARGET_TYPE (type), 0)) { arg1 = evaluate_subexp (NULL_TYPE, exp, &preeval_pos, EVAL_NORMAL); type = value_type (ada_value_ind (arg1)); } else { type = to_static_fixed_type (ada_aligned_type (ada_check_typedef (TYPE_TARGET_TYPE (type)))); } ada_ensure_varsize_limit (type); return value_zero (type, lval_memory); } else if (TYPE_CODE (type) == TYPE_CODE_INT) { /* GDB allows dereferencing an int. */ if (expect_type == NULL) return value_zero (builtin_type (exp->gdbarch)->builtin_int, lval_memory); else { expect_type = to_static_fixed_type (ada_aligned_type (expect_type)); return value_zero (expect_type, lval_memory); } } else error (_("Attempt to take contents of a non-pointer value.")); } arg1 = ada_coerce_ref (arg1); /* FIXME: What is this for?? */ type = ada_check_typedef (value_type (arg1)); if (TYPE_CODE (type) == TYPE_CODE_INT) /* GDB allows dereferencing an int. If we were given the expect_type, then use that as the target type. Otherwise, assume that the target type is an int. */ { if (expect_type != NULL) return ada_value_ind (value_cast (lookup_pointer_type (expect_type), arg1)); else return value_at_lazy (builtin_type (exp->gdbarch)->builtin_int, (CORE_ADDR) value_as_address (arg1)); } if (ada_is_array_descriptor_type (type)) /* GDB allows dereferencing GNAT array descriptors. */ return ada_coerce_to_simple_array (arg1); else return ada_value_ind (arg1); case STRUCTOP_STRUCT: tem = longest_to_int (exp->elts[pc + 1].longconst); (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); preeval_pos = *pos; arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; if (noside == EVAL_AVOID_SIDE_EFFECTS) { struct type *type1 = value_type (arg1); if (ada_is_tagged_type (type1, 1)) { type = ada_lookup_struct_elt_type (type1, &exp->elts[pc + 2].string, 1, 1); /* If the field is not found, check if it exists in the extension of this object's type. This means that we need to evaluate completely the expression. */ if (type == NULL) { arg1 = evaluate_subexp (NULL_TYPE, exp, &preeval_pos, EVAL_NORMAL); arg1 = ada_value_struct_elt (arg1, &exp->elts[pc + 2].string, 0); arg1 = unwrap_value (arg1); type = value_type (ada_to_fixed_value (arg1)); } } else type = ada_lookup_struct_elt_type (type1, &exp->elts[pc + 2].string, 1, 0); return value_zero (ada_aligned_type (type), lval_memory); } else { arg1 = ada_value_struct_elt (arg1, &exp->elts[pc + 2].string, 0); arg1 = unwrap_value (arg1); return ada_to_fixed_value (arg1); } case OP_TYPE: /* The value is not supposed to be used. This is here to make it easier to accommodate expressions that contain types. */ (*pos) += 2; if (noside == EVAL_SKIP) goto nosideret; else if (noside == EVAL_AVOID_SIDE_EFFECTS) return allocate_value (exp->elts[pc + 1].type); else error (_("Attempt to use a type name as an expression")); case OP_AGGREGATE: case OP_CHOICES: case OP_OTHERS: case OP_DISCRETE_RANGE: case OP_POSITIONAL: case OP_NAME: if (noside == EVAL_NORMAL) switch (op) { case OP_NAME: error (_("Undefined name, ambiguous name, or renaming used in " "component association: %s."), &exp->elts[pc+2].string); case OP_AGGREGATE: error (_("Aggregates only allowed on the right of an assignment")); default: internal_error (__FILE__, __LINE__, _("aggregate apparently mangled")); } ada_forward_operator_length (exp, pc, &oplen, &nargs); *pos += oplen - 1; for (tem = 0; tem < nargs; tem += 1) ada_evaluate_subexp (NULL, exp, pos, noside); goto nosideret; } nosideret: return eval_skip_value (exp); } /* Fixed point */ /* If TYPE encodes an Ada fixed-point type, return the suffix of the type name that encodes the 'small and 'delta information. Otherwise, return NULL. */ static const char * fixed_type_info (struct type *type) { const char *name = ada_type_name (type); enum type_code code = (type == NULL) ? TYPE_CODE_UNDEF : TYPE_CODE (type); if ((code == TYPE_CODE_INT || code == TYPE_CODE_RANGE) && name != NULL) { const char *tail = strstr (name, "___XF_"); if (tail == NULL) return NULL; else return tail + 5; } else if (code == TYPE_CODE_RANGE && TYPE_TARGET_TYPE (type) != type) return fixed_type_info (TYPE_TARGET_TYPE (type)); else return NULL; } /* Returns non-zero iff TYPE represents an Ada fixed-point type. */ int ada_is_fixed_point_type (struct type *type) { return fixed_type_info (type) != NULL; } /* Return non-zero iff TYPE represents a System.Address type. */ int ada_is_system_address_type (struct type *type) { return (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "system__address") == 0); } /* Assuming that TYPE is the representation of an Ada fixed-point type, return the target floating-point type to be used to represent of this type during internal computation. */ static struct type * ada_scaling_type (struct type *type) { return builtin_type (get_type_arch (type))->builtin_long_double; } /* Assuming that TYPE is the representation of an Ada fixed-point type, return its delta, or NULL if the type is malformed and the delta cannot be determined. */ struct value * ada_delta (struct type *type) { const char *encoding = fixed_type_info (type); struct type *scale_type = ada_scaling_type (type); long long num, den; if (sscanf (encoding, "_%lld_%lld", &num, &den) < 2) return nullptr; else return value_binop (value_from_longest (scale_type, num), value_from_longest (scale_type, den), BINOP_DIV); } /* Assuming that ada_is_fixed_point_type (TYPE), return the scaling factor ('SMALL value) associated with the type. */ struct value * ada_scaling_factor (struct type *type) { const char *encoding = fixed_type_info (type); struct type *scale_type = ada_scaling_type (type); long long num0, den0, num1, den1; int n; n = sscanf (encoding, "_%lld_%lld_%lld_%lld", &num0, &den0, &num1, &den1); if (n < 2) return value_from_longest (scale_type, 1); else if (n == 4) return value_binop (value_from_longest (scale_type, num1), value_from_longest (scale_type, den1), BINOP_DIV); else return value_binop (value_from_longest (scale_type, num0), value_from_longest (scale_type, den0), BINOP_DIV); } /* Range types */ /* Scan STR beginning at position K for a discriminant name, and return the value of that discriminant field of DVAL in *PX. If PNEW_K is not null, put the position of the character beyond the name scanned in *PNEW_K. Return 1 if successful; return 0 and do not alter *PX and *PNEW_K if unsuccessful. */ static int scan_discrim_bound (const char *str, int k, struct value *dval, LONGEST * px, int *pnew_k) { static char *bound_buffer = NULL; static size_t bound_buffer_len = 0; const char *pstart, *pend, *bound; struct value *bound_val; if (dval == NULL || str == NULL || str[k] == '\0') return 0; pstart = str + k; pend = strstr (pstart, "__"); if (pend == NULL) { bound = pstart; k += strlen (bound); } else { int len = pend - pstart; /* Strip __ and beyond. */ GROW_VECT (bound_buffer, bound_buffer_len, len + 1); strncpy (bound_buffer, pstart, len); bound_buffer[len] = '\0'; bound = bound_buffer; k = pend - str; } bound_val = ada_search_struct_field (bound, dval, 0, value_type (dval)); if (bound_val == NULL) return 0; *px = value_as_long (bound_val); if (pnew_k != NULL) *pnew_k = k; return 1; } /* Value of variable named NAME in the current environment. If no such variable found, then if ERR_MSG is null, returns 0, and otherwise causes an error with message ERR_MSG. */ static struct value * get_var_value (const char *name, const char *err_msg) { lookup_name_info lookup_name (name, symbol_name_match_type::FULL); std::vector syms; int nsyms = ada_lookup_symbol_list_worker (lookup_name, get_selected_block (0), VAR_DOMAIN, &syms, 1); if (nsyms != 1) { if (err_msg == NULL) return 0; else error (("%s"), err_msg); } return value_of_variable (syms[0].symbol, syms[0].block); } /* Value of integer variable named NAME in the current environment. If no such variable is found, returns false. Otherwise, sets VALUE to the variable's value and returns true. */ bool get_int_var_value (const char *name, LONGEST &value) { struct value *var_val = get_var_value (name, 0); if (var_val == 0) return false; value = value_as_long (var_val); return true; } /* Return a range type whose base type is that of the range type named NAME in the current environment, and whose bounds are calculated from NAME according to the GNAT range encoding conventions. Extract discriminant values, if needed, from DVAL. ORIG_TYPE is the corresponding range type from debug information; fall back to using it if symbol lookup fails. If a new type must be created, allocate it like ORIG_TYPE was. The bounds information, in general, is encoded in NAME, the base type given in the named range type. */ static struct type * to_fixed_range_type (struct type *raw_type, struct value *dval) { const char *name; struct type *base_type; const char *subtype_info; gdb_assert (raw_type != NULL); gdb_assert (TYPE_NAME (raw_type) != NULL); if (TYPE_CODE (raw_type) == TYPE_CODE_RANGE) base_type = TYPE_TARGET_TYPE (raw_type); else base_type = raw_type; name = TYPE_NAME (raw_type); subtype_info = strstr (name, "___XD"); if (subtype_info == NULL) { LONGEST L = ada_discrete_type_low_bound (raw_type); LONGEST U = ada_discrete_type_high_bound (raw_type); if (L < INT_MIN || U > INT_MAX) return raw_type; else return create_static_range_type (alloc_type_copy (raw_type), raw_type, L, U); } else { static char *name_buf = NULL; static size_t name_len = 0; int prefix_len = subtype_info - name; LONGEST L, U; struct type *type; const char *bounds_str; int n; GROW_VECT (name_buf, name_len, prefix_len + 5); strncpy (name_buf, name, prefix_len); name_buf[prefix_len] = '\0'; subtype_info += 5; bounds_str = strchr (subtype_info, '_'); n = 1; if (*subtype_info == 'L') { if (!ada_scan_number (bounds_str, n, &L, &n) && !scan_discrim_bound (bounds_str, n, dval, &L, &n)) return raw_type; if (bounds_str[n] == '_') n += 2; else if (bounds_str[n] == '.') /* FIXME? SGI Workshop kludge. */ n += 1; subtype_info += 1; } else { strcpy (name_buf + prefix_len, "___L"); if (!get_int_var_value (name_buf, L)) { lim_warning (_("Unknown lower bound, using 1.")); L = 1; } } if (*subtype_info == 'U') { if (!ada_scan_number (bounds_str, n, &U, &n) && !scan_discrim_bound (bounds_str, n, dval, &U, &n)) return raw_type; } else { strcpy (name_buf + prefix_len, "___U"); if (!get_int_var_value (name_buf, U)) { lim_warning (_("Unknown upper bound, using %ld."), (long) L); U = L; } } type = create_static_range_type (alloc_type_copy (raw_type), base_type, L, U); /* create_static_range_type alters the resulting type's length to match the size of the base_type, which is not what we want. Set it back to the original range type's length. */ TYPE_LENGTH (type) = TYPE_LENGTH (raw_type); TYPE_NAME (type) = name; return type; } } /* True iff NAME is the name of a range type. */ int ada_is_range_type_name (const char *name) { return (name != NULL && strstr (name, "___XD")); } /* Modular types */ /* True iff TYPE is an Ada modular type. */ int ada_is_modular_type (struct type *type) { struct type *subranged_type = get_base_type (type); return (subranged_type != NULL && TYPE_CODE (type) == TYPE_CODE_RANGE && TYPE_CODE (subranged_type) == TYPE_CODE_INT && TYPE_UNSIGNED (subranged_type)); } /* Assuming ada_is_modular_type (TYPE), the modulus of TYPE. */ ULONGEST ada_modulus (struct type *type) { return (ULONGEST) TYPE_HIGH_BOUND (type) + 1; } /* Ada exception catchpoint support: --------------------------------- We support 3 kinds of exception catchpoints: . catchpoints on Ada exceptions . catchpoints on unhandled Ada exceptions . catchpoints on failed assertions Exceptions raised during failed assertions, or unhandled exceptions could perfectly be caught with the general catchpoint on Ada exceptions. However, we can easily differentiate these two special cases, and having the option to distinguish these two cases from the rest can be useful to zero-in on certain situations. Exception catchpoints are a specialized form of breakpoint, since they rely on inserting breakpoints inside known routines of the GNAT runtime. The implementation therefore uses a standard breakpoint structure of the BP_BREAKPOINT type, but with its own set of breakpoint_ops. Support in the runtime for exception catchpoints have been changed a few times already, and these changes affect the implementation of these catchpoints. In order to be able to support several variants of the runtime, we use a sniffer that will determine the runtime variant used by the program being debugged. */ /* Ada's standard exceptions. The Ada 83 standard also defined Numeric_Error. But there so many situations where it was unclear from the Ada 83 Reference Manual (RM) whether Constraint_Error or Numeric_Error should be raised, that the ARG (Ada Rapporteur Group) eventually issued a Binding Interpretation saying that anytime the RM says that Numeric_Error should be raised, the implementation may raise Constraint_Error. Ada 95 went one step further and pretty much removed Numeric_Error from the list of standard exceptions (it made it a renaming of Constraint_Error, to help preserve compatibility when compiling an Ada83 compiler). As such, we do not include Numeric_Error from this list of standard exceptions. */ static const char *standard_exc[] = { "constraint_error", "program_error", "storage_error", "tasking_error" }; typedef CORE_ADDR (ada_unhandled_exception_name_addr_ftype) (void); /* A structure that describes how to support exception catchpoints for a given executable. */ struct exception_support_info { /* The name of the symbol to break on in order to insert a catchpoint on exceptions. */ const char *catch_exception_sym; /* The name of the symbol to break on in order to insert a catchpoint on unhandled exceptions. */ const char *catch_exception_unhandled_sym; /* The name of the symbol to break on in order to insert a catchpoint on failed assertions. */ const char *catch_assert_sym; /* The name of the symbol to break on in order to insert a catchpoint on exception handling. */ const char *catch_handlers_sym; /* Assuming that the inferior just triggered an unhandled exception catchpoint, this function is responsible for returning the address in inferior memory where the name of that exception is stored. Return zero if the address could not be computed. */ ada_unhandled_exception_name_addr_ftype *unhandled_exception_name_addr; }; static CORE_ADDR ada_unhandled_exception_name_addr (void); static CORE_ADDR ada_unhandled_exception_name_addr_from_raise (void); /* The following exception support info structure describes how to implement exception catchpoints with the latest version of the Ada runtime (as of 2019-08-??). */ static const struct exception_support_info default_exception_support_info = { "__gnat_debug_raise_exception", /* catch_exception_sym */ "__gnat_unhandled_exception", /* catch_exception_unhandled_sym */ "__gnat_debug_raise_assert_failure", /* catch_assert_sym */ "__gnat_begin_handler_v1", /* catch_handlers_sym */ ada_unhandled_exception_name_addr }; /* The following exception support info structure describes how to implement exception catchpoints with an earlier version of the Ada runtime (as of 2007-03-06) using v0 of the EH ABI. */ static const struct exception_support_info exception_support_info_v0 = { "__gnat_debug_raise_exception", /* catch_exception_sym */ "__gnat_unhandled_exception", /* catch_exception_unhandled_sym */ "__gnat_debug_raise_assert_failure", /* catch_assert_sym */ "__gnat_begin_handler", /* catch_handlers_sym */ ada_unhandled_exception_name_addr }; /* The following exception support info structure describes how to implement exception catchpoints with a slightly older version of the Ada runtime. */ static const struct exception_support_info exception_support_info_fallback = { "__gnat_raise_nodefer_with_msg", /* catch_exception_sym */ "__gnat_unhandled_exception", /* catch_exception_unhandled_sym */ "system__assertions__raise_assert_failure", /* catch_assert_sym */ "__gnat_begin_handler", /* catch_handlers_sym */ ada_unhandled_exception_name_addr_from_raise }; /* Return nonzero if we can detect the exception support routines described in EINFO. This function errors out if an abnormal situation is detected (for instance, if we find the exception support routines, but that support is found to be incomplete). */ static int ada_has_this_exception_support (const struct exception_support_info *einfo) { struct symbol *sym; /* The symbol we're looking up is provided by a unit in the GNAT runtime that should be compiled with debugging information. As a result, we expect to find that symbol in the symtabs. */ sym = standard_lookup (einfo->catch_exception_sym, NULL, VAR_DOMAIN); if (sym == NULL) { /* Perhaps we did not find our symbol because the Ada runtime was compiled without debugging info, or simply stripped of it. It happens on some GNU/Linux distributions for instance, where users have to install a separate debug package in order to get the runtime's debugging info. In that situation, let the user know why we cannot insert an Ada exception catchpoint. Note: Just for the purpose of inserting our Ada exception catchpoint, we could rely purely on the associated minimal symbol. But we would be operating in degraded mode anyway, since we are still lacking the debugging info needed later on to extract the name of the exception being raised (this name is printed in the catchpoint message, and is also used when trying to catch a specific exception). We do not handle this case for now. */ struct bound_minimal_symbol msym = lookup_minimal_symbol (einfo->catch_exception_sym, NULL, NULL); if (msym.minsym && MSYMBOL_TYPE (msym.minsym) != mst_solib_trampoline) error (_("Your Ada runtime appears to be missing some debugging " "information.\nCannot insert Ada exception catchpoint " "in this configuration.")); return 0; } /* Make sure that the symbol we found corresponds to a function. */ if (SYMBOL_CLASS (sym) != LOC_BLOCK) { error (_("Symbol \"%s\" is not a function (class = %d)"), sym->linkage_name (), SYMBOL_CLASS (sym)); return 0; } sym = standard_lookup (einfo->catch_handlers_sym, NULL, VAR_DOMAIN); if (sym == NULL) { struct bound_minimal_symbol msym = lookup_minimal_symbol (einfo->catch_handlers_sym, NULL, NULL); if (msym.minsym && MSYMBOL_TYPE (msym.minsym) != mst_solib_trampoline) error (_("Your Ada runtime appears to be missing some debugging " "information.\nCannot insert Ada exception catchpoint " "in this configuration.")); return 0; } /* Make sure that the symbol we found corresponds to a function. */ if (SYMBOL_CLASS (sym) != LOC_BLOCK) { error (_("Symbol \"%s\" is not a function (class = %d)"), sym->linkage_name (), SYMBOL_CLASS (sym)); return 0; } return 1; } /* Inspect the Ada runtime and determine which exception info structure should be used to provide support for exception catchpoints. This function will always set the per-inferior exception_info, or raise an error. */ static void ada_exception_support_info_sniffer (void) { struct ada_inferior_data *data = get_ada_inferior_data (current_inferior ()); /* If the exception info is already known, then no need to recompute it. */ if (data->exception_info != NULL) return; /* Check the latest (default) exception support info. */ if (ada_has_this_exception_support (&default_exception_support_info)) { data->exception_info = &default_exception_support_info; return; } /* Try the v0 exception suport info. */ if (ada_has_this_exception_support (&exception_support_info_v0)) { data->exception_info = &exception_support_info_v0; return; } /* Try our fallback exception suport info. */ if (ada_has_this_exception_support (&exception_support_info_fallback)) { data->exception_info = &exception_support_info_fallback; return; } /* Sometimes, it is normal for us to not be able to find the routine we are looking for. This happens when the program is linked with the shared version of the GNAT runtime, and the program has not been started yet. Inform the user of these two possible causes if applicable. */ if (ada_update_initial_language (language_unknown) != language_ada) error (_("Unable to insert catchpoint. Is this an Ada main program?")); /* If the symbol does not exist, then check that the program is already started, to make sure that shared libraries have been loaded. If it is not started, this may mean that the symbol is in a shared library. */ if (inferior_ptid.pid () == 0) error (_("Unable to insert catchpoint. Try to start the program first.")); /* At this point, we know that we are debugging an Ada program and that the inferior has been started, but we still are not able to find the run-time symbols. That can mean that we are in configurable run time mode, or that a-except as been optimized out by the linker... In any case, at this point it is not worth supporting this feature. */ error (_("Cannot insert Ada exception catchpoints in this configuration.")); } /* True iff FRAME is very likely to be that of a function that is part of the runtime system. This is all very heuristic, but is intended to be used as advice as to what frames are uninteresting to most users. */ static int is_known_support_routine (struct frame_info *frame) { enum language func_lang; int i; const char *fullname; /* If this code does not have any debugging information (no symtab), This cannot be any user code. */ symtab_and_line sal = find_frame_sal (frame); if (sal.symtab == NULL) return 1; /* If there is a symtab, but the associated source file cannot be located, then assume this is not user code: Selecting a frame for which we cannot display the code would not be very helpful for the user. This should also take care of case such as VxWorks where the kernel has some debugging info provided for a few units. */ fullname = symtab_to_fullname (sal.symtab); if (access (fullname, R_OK) != 0) return 1; /* Check the unit filename against the Ada runtime file naming. We also check the name of the objfile against the name of some known system libraries that sometimes come with debugging info too. */ for (i = 0; known_runtime_file_name_patterns[i] != NULL; i += 1) { re_comp (known_runtime_file_name_patterns[i]); if (re_exec (lbasename (sal.symtab->filename))) return 1; if (SYMTAB_OBJFILE (sal.symtab) != NULL && re_exec (objfile_name (SYMTAB_OBJFILE (sal.symtab)))) return 1; } /* Check whether the function is a GNAT-generated entity. */ gdb::unique_xmalloc_ptr func_name = find_frame_funname (frame, &func_lang, NULL); if (func_name == NULL) return 1; for (i = 0; known_auxiliary_function_name_patterns[i] != NULL; i += 1) { re_comp (known_auxiliary_function_name_patterns[i]); if (re_exec (func_name.get ())) return 1; } return 0; } /* Find the first frame that contains debugging information and that is not part of the Ada run-time, starting from FI and moving upward. */ void ada_find_printable_frame (struct frame_info *fi) { for (; fi != NULL; fi = get_prev_frame (fi)) { if (!is_known_support_routine (fi)) { select_frame (fi); break; } } } /* Assuming that the inferior just triggered an unhandled exception catchpoint, return the address in inferior memory where the name of the exception is stored. Return zero if the address could not be computed. */ static CORE_ADDR ada_unhandled_exception_name_addr (void) { return parse_and_eval_address ("e.full_name"); } /* Same as ada_unhandled_exception_name_addr, except that this function should be used when the inferior uses an older version of the runtime, where the exception name needs to be extracted from a specific frame several frames up in the callstack. */ static CORE_ADDR ada_unhandled_exception_name_addr_from_raise (void) { int frame_level; struct frame_info *fi; struct ada_inferior_data *data = get_ada_inferior_data (current_inferior ()); /* To determine the name of this exception, we need to select the frame corresponding to RAISE_SYM_NAME. This frame is at least 3 levels up, so we simply skip the first 3 frames without checking the name of their associated function. */ fi = get_current_frame (); for (frame_level = 0; frame_level < 3; frame_level += 1) if (fi != NULL) fi = get_prev_frame (fi); while (fi != NULL) { enum language func_lang; gdb::unique_xmalloc_ptr func_name = find_frame_funname (fi, &func_lang, NULL); if (func_name != NULL) { if (strcmp (func_name.get (), data->exception_info->catch_exception_sym) == 0) break; /* We found the frame we were looking for... */ } fi = get_prev_frame (fi); } if (fi == NULL) return 0; select_frame (fi); return parse_and_eval_address ("id.full_name"); } /* Assuming the inferior just triggered an Ada exception catchpoint (of any type), return the address in inferior memory where the name of the exception is stored, if applicable. Assumes the selected frame is the current frame. Return zero if the address could not be computed, or if not relevant. */ static CORE_ADDR ada_exception_name_addr_1 (enum ada_exception_catchpoint_kind ex, struct breakpoint *b) { struct ada_inferior_data *data = get_ada_inferior_data (current_inferior ()); switch (ex) { case ada_catch_exception: return (parse_and_eval_address ("e.full_name")); break; case ada_catch_exception_unhandled: return data->exception_info->unhandled_exception_name_addr (); break; case ada_catch_handlers: return 0; /* The runtimes does not provide access to the exception name. */ break; case ada_catch_assert: return 0; /* Exception name is not relevant in this case. */ break; default: internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); break; } return 0; /* Should never be reached. */ } /* Assuming the inferior is stopped at an exception catchpoint, return the message which was associated to the exception, if available. Return NULL if the message could not be retrieved. Note: The exception message can be associated to an exception either through the use of the Raise_Exception function, or more simply (Ada 2005 and later), via: raise Exception_Name with "exception message"; */ static gdb::unique_xmalloc_ptr ada_exception_message_1 (void) { struct value *e_msg_val; int e_msg_len; /* For runtimes that support this feature, the exception message is passed as an unbounded string argument called "message". */ e_msg_val = parse_and_eval ("message"); if (e_msg_val == NULL) return NULL; /* Exception message not supported. */ e_msg_val = ada_coerce_to_simple_array (e_msg_val); gdb_assert (e_msg_val != NULL); e_msg_len = TYPE_LENGTH (value_type (e_msg_val)); /* If the message string is empty, then treat it as if there was no exception message. */ if (e_msg_len <= 0) return NULL; gdb::unique_xmalloc_ptr e_msg ((char *) xmalloc (e_msg_len + 1)); read_memory_string (value_address (e_msg_val), e_msg.get (), e_msg_len + 1); e_msg.get ()[e_msg_len] = '\0'; return e_msg; } /* Same as ada_exception_message_1, except that all exceptions are contained here (returning NULL instead). */ static gdb::unique_xmalloc_ptr ada_exception_message (void) { gdb::unique_xmalloc_ptr e_msg; try { e_msg = ada_exception_message_1 (); } catch (const gdb_exception_error &e) { e_msg.reset (nullptr); } return e_msg; } /* Same as ada_exception_name_addr_1, except that it intercepts and contains any error that ada_exception_name_addr_1 might cause to be thrown. When an error is intercepted, a warning with the error message is printed, and zero is returned. */ static CORE_ADDR ada_exception_name_addr (enum ada_exception_catchpoint_kind ex, struct breakpoint *b) { CORE_ADDR result = 0; try { result = ada_exception_name_addr_1 (ex, b); } catch (const gdb_exception_error &e) { warning (_("failed to get exception name: %s"), e.what ()); return 0; } return result; } static std::string ada_exception_catchpoint_cond_string (const char *excep_string, enum ada_exception_catchpoint_kind ex); /* Ada catchpoints. In the case of catchpoints on Ada exceptions, the catchpoint will stop the target on every exception the program throws. When a user specifies the name of a specific exception, we translate this request into a condition expression (in text form), and then parse it into an expression stored in each of the catchpoint's locations. We then use this condition to check whether the exception that was raised is the one the user is interested in. If not, then the target is resumed again. We store the name of the requested exception, in order to be able to re-set the condition expression when symbols change. */ /* An instance of this type is used to represent an Ada catchpoint breakpoint location. */ class ada_catchpoint_location : public bp_location { public: ada_catchpoint_location (breakpoint *owner) : bp_location (owner, bp_loc_software_breakpoint) {} /* The condition that checks whether the exception that was raised is the specific exception the user specified on catchpoint creation. */ expression_up excep_cond_expr; }; /* An instance of this type is used to represent an Ada catchpoint. */ struct ada_catchpoint : public breakpoint { explicit ada_catchpoint (enum ada_exception_catchpoint_kind kind) : m_kind (kind) { } /* The name of the specific exception the user specified. */ std::string excep_string; /* What kind of catchpoint this is. */ enum ada_exception_catchpoint_kind m_kind; }; /* Parse the exception condition string in the context of each of the catchpoint's locations, and store them for later evaluation. */ static void create_excep_cond_exprs (struct ada_catchpoint *c, enum ada_exception_catchpoint_kind ex) { struct bp_location *bl; /* Nothing to do if there's no specific exception to catch. */ if (c->excep_string.empty ()) return; /* Same if there are no locations... */ if (c->loc == NULL) return; /* Compute the condition expression in text form, from the specific expection we want to catch. */ std::string cond_string = ada_exception_catchpoint_cond_string (c->excep_string.c_str (), ex); /* Iterate over all the catchpoint's locations, and parse an expression for each. */ for (bl = c->loc; bl != NULL; bl = bl->next) { struct ada_catchpoint_location *ada_loc = (struct ada_catchpoint_location *) bl; expression_up exp; if (!bl->shlib_disabled) { const char *s; s = cond_string.c_str (); try { exp = parse_exp_1 (&s, bl->address, block_for_pc (bl->address), 0); } catch (const gdb_exception_error &e) { warning (_("failed to reevaluate internal exception condition " "for catchpoint %d: %s"), c->number, e.what ()); } } ada_loc->excep_cond_expr = std::move (exp); } } /* Implement the ALLOCATE_LOCATION method in the breakpoint_ops structure for all exception catchpoint kinds. */ static struct bp_location * allocate_location_exception (struct breakpoint *self) { return new ada_catchpoint_location (self); } /* Implement the RE_SET method in the breakpoint_ops structure for all exception catchpoint kinds. */ static void re_set_exception (struct breakpoint *b) { struct ada_catchpoint *c = (struct ada_catchpoint *) b; /* Call the base class's method. This updates the catchpoint's locations. */ bkpt_breakpoint_ops.re_set (b); /* Reparse the exception conditional expressions. One for each location. */ create_excep_cond_exprs (c, c->m_kind); } /* Returns true if we should stop for this breakpoint hit. If the user specified a specific exception, we only want to cause a stop if the program thrown that exception. */ static int should_stop_exception (const struct bp_location *bl) { struct ada_catchpoint *c = (struct ada_catchpoint *) bl->owner; const struct ada_catchpoint_location *ada_loc = (const struct ada_catchpoint_location *) bl; int stop; struct internalvar *var = lookup_internalvar ("_ada_exception"); if (c->m_kind == ada_catch_assert) clear_internalvar (var); else { try { const char *expr; if (c->m_kind == ada_catch_handlers) expr = ("GNAT_GCC_exception_Access(gcc_exception)" ".all.occurrence.id"); else expr = "e"; struct value *exc = parse_and_eval (expr); set_internalvar (var, exc); } catch (const gdb_exception_error &ex) { clear_internalvar (var); } } /* With no specific exception, should always stop. */ if (c->excep_string.empty ()) return 1; if (ada_loc->excep_cond_expr == NULL) { /* We will have a NULL expression if back when we were creating the expressions, this location's had failed to parse. */ return 1; } stop = 1; try { struct value *mark; mark = value_mark (); stop = value_true (evaluate_expression (ada_loc->excep_cond_expr.get ())); value_free_to_mark (mark); } catch (const gdb_exception &ex) { exception_fprintf (gdb_stderr, ex, _("Error in testing exception condition:\n")); } return stop; } /* Implement the CHECK_STATUS method in the breakpoint_ops structure for all exception catchpoint kinds. */ static void check_status_exception (bpstat bs) { bs->stop = should_stop_exception (bs->bp_location_at); } /* Implement the PRINT_IT method in the breakpoint_ops structure for all exception catchpoint kinds. */ static enum print_stop_action print_it_exception (bpstat bs) { struct ui_out *uiout = current_uiout; struct breakpoint *b = bs->breakpoint_at; annotate_catchpoint (b->number); if (uiout->is_mi_like_p ()) { uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_BREAKPOINT_HIT)); uiout->field_string ("disp", bpdisp_text (b->disposition)); } uiout->text (b->disposition == disp_del ? "\nTemporary catchpoint " : "\nCatchpoint "); uiout->field_signed ("bkptno", b->number); uiout->text (", "); /* ada_exception_name_addr relies on the selected frame being the current frame. Need to do this here because this function may be called more than once when printing a stop, and below, we'll select the first frame past the Ada run-time (see ada_find_printable_frame). */ select_frame (get_current_frame ()); struct ada_catchpoint *c = (struct ada_catchpoint *) b; switch (c->m_kind) { case ada_catch_exception: case ada_catch_exception_unhandled: case ada_catch_handlers: { const CORE_ADDR addr = ada_exception_name_addr (c->m_kind, b); char exception_name[256]; if (addr != 0) { read_memory (addr, (gdb_byte *) exception_name, sizeof (exception_name) - 1); exception_name [sizeof (exception_name) - 1] = '\0'; } else { /* For some reason, we were unable to read the exception name. This could happen if the Runtime was compiled without debugging info, for instance. In that case, just replace the exception name by the generic string "exception" - it will read as "an exception" in the notification we are about to print. */ memcpy (exception_name, "exception", sizeof ("exception")); } /* In the case of unhandled exception breakpoints, we print the exception name as "unhandled EXCEPTION_NAME", to make it clearer to the user which kind of catchpoint just got hit. We used ui_out_text to make sure that this extra info does not pollute the exception name in the MI case. */ if (c->m_kind == ada_catch_exception_unhandled) uiout->text ("unhandled "); uiout->field_string ("exception-name", exception_name); } break; case ada_catch_assert: /* In this case, the name of the exception is not really important. Just print "failed assertion" to make it clearer that his program just hit an assertion-failure catchpoint. We used ui_out_text because this info does not belong in the MI output. */ uiout->text ("failed assertion"); break; } gdb::unique_xmalloc_ptr exception_message = ada_exception_message (); if (exception_message != NULL) { uiout->text (" ("); uiout->field_string ("exception-message", exception_message.get ()); uiout->text (")"); } uiout->text (" at "); ada_find_printable_frame (get_current_frame ()); return PRINT_SRC_AND_LOC; } /* Implement the PRINT_ONE method in the breakpoint_ops structure for all exception catchpoint kinds. */ static void print_one_exception (struct breakpoint *b, struct bp_location **last_loc) { struct ui_out *uiout = current_uiout; struct ada_catchpoint *c = (struct ada_catchpoint *) b; struct value_print_options opts; get_user_print_options (&opts); if (opts.addressprint) uiout->field_skip ("addr"); annotate_field (5); switch (c->m_kind) { case ada_catch_exception: if (!c->excep_string.empty ()) { std::string msg = string_printf (_("`%s' Ada exception"), c->excep_string.c_str ()); uiout->field_string ("what", msg); } else uiout->field_string ("what", "all Ada exceptions"); break; case ada_catch_exception_unhandled: uiout->field_string ("what", "unhandled Ada exceptions"); break; case ada_catch_handlers: if (!c->excep_string.empty ()) { uiout->field_fmt ("what", _("`%s' Ada exception handlers"), c->excep_string.c_str ()); } else uiout->field_string ("what", "all Ada exceptions handlers"); break; case ada_catch_assert: uiout->field_string ("what", "failed Ada assertions"); break; default: internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); break; } } /* Implement the PRINT_MENTION method in the breakpoint_ops structure for all exception catchpoint kinds. */ static void print_mention_exception (struct breakpoint *b) { struct ada_catchpoint *c = (struct ada_catchpoint *) b; struct ui_out *uiout = current_uiout; uiout->text (b->disposition == disp_del ? _("Temporary catchpoint ") : _("Catchpoint ")); uiout->field_signed ("bkptno", b->number); uiout->text (": "); switch (c->m_kind) { case ada_catch_exception: if (!c->excep_string.empty ()) { std::string info = string_printf (_("`%s' Ada exception"), c->excep_string.c_str ()); uiout->text (info.c_str ()); } else uiout->text (_("all Ada exceptions")); break; case ada_catch_exception_unhandled: uiout->text (_("unhandled Ada exceptions")); break; case ada_catch_handlers: if (!c->excep_string.empty ()) { std::string info = string_printf (_("`%s' Ada exception handlers"), c->excep_string.c_str ()); uiout->text (info.c_str ()); } else uiout->text (_("all Ada exceptions handlers")); break; case ada_catch_assert: uiout->text (_("failed Ada assertions")); break; default: internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); break; } } /* Implement the PRINT_RECREATE method in the breakpoint_ops structure for all exception catchpoint kinds. */ static void print_recreate_exception (struct breakpoint *b, struct ui_file *fp) { struct ada_catchpoint *c = (struct ada_catchpoint *) b; switch (c->m_kind) { case ada_catch_exception: fprintf_filtered (fp, "catch exception"); if (!c->excep_string.empty ()) fprintf_filtered (fp, " %s", c->excep_string.c_str ()); break; case ada_catch_exception_unhandled: fprintf_filtered (fp, "catch exception unhandled"); break; case ada_catch_handlers: fprintf_filtered (fp, "catch handlers"); break; case ada_catch_assert: fprintf_filtered (fp, "catch assert"); break; default: internal_error (__FILE__, __LINE__, _("unexpected catchpoint type")); } print_recreate_thread (b, fp); } /* Virtual tables for various breakpoint types. */ static struct breakpoint_ops catch_exception_breakpoint_ops; static struct breakpoint_ops catch_exception_unhandled_breakpoint_ops; static struct breakpoint_ops catch_assert_breakpoint_ops; static struct breakpoint_ops catch_handlers_breakpoint_ops; /* See ada-lang.h. */ bool is_ada_exception_catchpoint (breakpoint *bp) { return (bp->ops == &catch_exception_breakpoint_ops || bp->ops == &catch_exception_unhandled_breakpoint_ops || bp->ops == &catch_assert_breakpoint_ops || bp->ops == &catch_handlers_breakpoint_ops); } /* Split the arguments specified in a "catch exception" command. Set EX to the appropriate catchpoint type. Set EXCEP_STRING to the name of the specific exception if specified by the user. IS_CATCH_HANDLERS_CMD: True if the arguments are for a "catch handlers" command. False otherwise. If a condition is found at the end of the arguments, the condition expression is stored in COND_STRING (memory must be deallocated after use). Otherwise COND_STRING is set to NULL. */ static void catch_ada_exception_command_split (const char *args, bool is_catch_handlers_cmd, enum ada_exception_catchpoint_kind *ex, std::string *excep_string, std::string *cond_string) { std::string exception_name; exception_name = extract_arg (&args); if (exception_name == "if") { /* This is not an exception name; this is the start of a condition expression for a catchpoint on all exceptions. So, "un-get" this token, and set exception_name to NULL. */ exception_name.clear (); args -= 2; } /* Check to see if we have a condition. */ args = skip_spaces (args); if (startswith (args, "if") && (isspace (args[2]) || args[2] == '\0')) { args += 2; args = skip_spaces (args); if (args[0] == '\0') error (_("Condition missing after `if' keyword")); *cond_string = args; args += strlen (args); } /* Check that we do not have any more arguments. Anything else is unexpected. */ if (args[0] != '\0') error (_("Junk at end of expression")); if (is_catch_handlers_cmd) { /* Catch handling of exceptions. */ *ex = ada_catch_handlers; *excep_string = exception_name; } else if (exception_name.empty ()) { /* Catch all exceptions. */ *ex = ada_catch_exception; excep_string->clear (); } else if (exception_name == "unhandled") { /* Catch unhandled exceptions. */ *ex = ada_catch_exception_unhandled; excep_string->clear (); } else { /* Catch a specific exception. */ *ex = ada_catch_exception; *excep_string = exception_name; } } /* Return the name of the symbol on which we should break in order to implement a catchpoint of the EX kind. */ static const char * ada_exception_sym_name (enum ada_exception_catchpoint_kind ex) { struct ada_inferior_data *data = get_ada_inferior_data (current_inferior ()); gdb_assert (data->exception_info != NULL); switch (ex) { case ada_catch_exception: return (data->exception_info->catch_exception_sym); break; case ada_catch_exception_unhandled: return (data->exception_info->catch_exception_unhandled_sym); break; case ada_catch_assert: return (data->exception_info->catch_assert_sym); break; case ada_catch_handlers: return (data->exception_info->catch_handlers_sym); break; default: internal_error (__FILE__, __LINE__, _("unexpected catchpoint kind (%d)"), ex); } } /* Return the breakpoint ops "virtual table" used for catchpoints of the EX kind. */ static const struct breakpoint_ops * ada_exception_breakpoint_ops (enum ada_exception_catchpoint_kind ex) { switch (ex) { case ada_catch_exception: return (&catch_exception_breakpoint_ops); break; case ada_catch_exception_unhandled: return (&catch_exception_unhandled_breakpoint_ops); break; case ada_catch_assert: return (&catch_assert_breakpoint_ops); break; case ada_catch_handlers: return (&catch_handlers_breakpoint_ops); break; default: internal_error (__FILE__, __LINE__, _("unexpected catchpoint kind (%d)"), ex); } } /* Return the condition that will be used to match the current exception being raised with the exception that the user wants to catch. This assumes that this condition is used when the inferior just triggered an exception catchpoint. EX: the type of catchpoints used for catching Ada exceptions. */ static std::string ada_exception_catchpoint_cond_string (const char *excep_string, enum ada_exception_catchpoint_kind ex) { int i; bool is_standard_exc = false; std::string result; if (ex == ada_catch_handlers) { /* For exception handlers catchpoints, the condition string does not use the same parameter as for the other exceptions. */ result = ("long_integer (GNAT_GCC_exception_Access" "(gcc_exception).all.occurrence.id)"); } else result = "long_integer (e)"; /* The standard exceptions are a special case. They are defined in runtime units that have been compiled without debugging info; if EXCEP_STRING is the not-fully-qualified name of a standard exception (e.g. "constraint_error") then, during the evaluation of the condition expression, the symbol lookup on this name would *not* return this standard exception. The catchpoint condition may then be set only on user-defined exceptions which have the same not-fully-qualified name (e.g. my_package.constraint_error). To avoid this unexcepted behavior, these standard exceptions are systematically prefixed by "standard". This means that "catch exception constraint_error" is rewritten into "catch exception standard.constraint_error". If an exception named constraint_error is defined in another package of the inferior program, then the only way to specify this exception as a breakpoint condition is to use its fully-qualified named: e.g. my_package.constraint_error. */ for (i = 0; i < sizeof (standard_exc) / sizeof (char *); i++) { if (strcmp (standard_exc [i], excep_string) == 0) { is_standard_exc = true; break; } } result += " = "; if (is_standard_exc) string_appendf (result, "long_integer (&standard.%s)", excep_string); else string_appendf (result, "long_integer (&%s)", excep_string); return result; } /* Return the symtab_and_line that should be used to insert an exception catchpoint of the TYPE kind. ADDR_STRING returns the name of the function where the real breakpoint that implements the catchpoints is set, depending on the type of catchpoint we need to create. */ static struct symtab_and_line ada_exception_sal (enum ada_exception_catchpoint_kind ex, std::string *addr_string, const struct breakpoint_ops **ops) { const char *sym_name; struct symbol *sym; /* First, find out which exception support info to use. */ ada_exception_support_info_sniffer (); /* Then lookup the function on which we will break in order to catch the Ada exceptions requested by the user. */ sym_name = ada_exception_sym_name (ex); sym = standard_lookup (sym_name, NULL, VAR_DOMAIN); if (sym == NULL) error (_("Catchpoint symbol not found: %s"), sym_name); if (SYMBOL_CLASS (sym) != LOC_BLOCK) error (_("Unable to insert catchpoint. %s is not a function."), sym_name); /* Set ADDR_STRING. */ *addr_string = sym_name; /* Set OPS. */ *ops = ada_exception_breakpoint_ops (ex); return find_function_start_sal (sym, 1); } /* Create an Ada exception catchpoint. EX_KIND is the kind of exception catchpoint to be created. If EXCEPT_STRING is empty, this catchpoint is expected to trigger for all exceptions. Otherwise, EXCEPT_STRING indicates the name of the exception to which this catchpoint applies. COND_STRING, if not empty, is the catchpoint condition. TEMPFLAG, if nonzero, means that the underlying breakpoint should be temporary. FROM_TTY is the usual argument passed to all commands implementations. */ void create_ada_exception_catchpoint (struct gdbarch *gdbarch, enum ada_exception_catchpoint_kind ex_kind, const std::string &excep_string, const std::string &cond_string, int tempflag, int disabled, int from_tty) { std::string addr_string; const struct breakpoint_ops *ops = NULL; struct symtab_and_line sal = ada_exception_sal (ex_kind, &addr_string, &ops); std::unique_ptr c (new ada_catchpoint (ex_kind)); init_ada_exception_breakpoint (c.get (), gdbarch, sal, addr_string.c_str (), ops, tempflag, disabled, from_tty); c->excep_string = excep_string; create_excep_cond_exprs (c.get (), ex_kind); if (!cond_string.empty ()) set_breakpoint_condition (c.get (), cond_string.c_str (), from_tty); install_breakpoint (0, std::move (c), 1); } /* Implement the "catch exception" command. */ static void catch_ada_exception_command (const char *arg_entry, int from_tty, struct cmd_list_element *command) { const char *arg = arg_entry; struct gdbarch *gdbarch = get_current_arch (); int tempflag; enum ada_exception_catchpoint_kind ex_kind; std::string excep_string; std::string cond_string; tempflag = get_cmd_context (command) == CATCH_TEMPORARY; if (!arg) arg = ""; catch_ada_exception_command_split (arg, false, &ex_kind, &excep_string, &cond_string); create_ada_exception_catchpoint (gdbarch, ex_kind, excep_string, cond_string, tempflag, 1 /* enabled */, from_tty); } /* Implement the "catch handlers" command. */ static void catch_ada_handlers_command (const char *arg_entry, int from_tty, struct cmd_list_element *command) { const char *arg = arg_entry; struct gdbarch *gdbarch = get_current_arch (); int tempflag; enum ada_exception_catchpoint_kind ex_kind; std::string excep_string; std::string cond_string; tempflag = get_cmd_context (command) == CATCH_TEMPORARY; if (!arg) arg = ""; catch_ada_exception_command_split (arg, true, &ex_kind, &excep_string, &cond_string); create_ada_exception_catchpoint (gdbarch, ex_kind, excep_string, cond_string, tempflag, 1 /* enabled */, from_tty); } /* Completion function for the Ada "catch" commands. */ static void catch_ada_completer (struct cmd_list_element *cmd, completion_tracker &tracker, const char *text, const char *word) { std::vector exceptions = ada_exceptions_list (NULL); for (const ada_exc_info &info : exceptions) { if (startswith (info.name, word)) tracker.add_completion (make_unique_xstrdup (info.name)); } } /* Split the arguments specified in a "catch assert" command. ARGS contains the command's arguments (or the empty string if no arguments were passed). If ARGS contains a condition, set COND_STRING to that condition (the memory needs to be deallocated after use). */ static void catch_ada_assert_command_split (const char *args, std::string &cond_string) { args = skip_spaces (args); /* Check whether a condition was provided. */ if (startswith (args, "if") && (isspace (args[2]) || args[2] == '\0')) { args += 2; args = skip_spaces (args); if (args[0] == '\0') error (_("condition missing after `if' keyword")); cond_string.assign (args); } /* Otherwise, there should be no other argument at the end of the command. */ else if (args[0] != '\0') error (_("Junk at end of arguments.")); } /* Implement the "catch assert" command. */ static void catch_assert_command (const char *arg_entry, int from_tty, struct cmd_list_element *command) { const char *arg = arg_entry; struct gdbarch *gdbarch = get_current_arch (); int tempflag; std::string cond_string; tempflag = get_cmd_context (command) == CATCH_TEMPORARY; if (!arg) arg = ""; catch_ada_assert_command_split (arg, cond_string); create_ada_exception_catchpoint (gdbarch, ada_catch_assert, "", cond_string, tempflag, 1 /* enabled */, from_tty); } /* Return non-zero if the symbol SYM is an Ada exception object. */ static int ada_is_exception_sym (struct symbol *sym) { const char *type_name = TYPE_NAME (SYMBOL_TYPE (sym)); return (SYMBOL_CLASS (sym) != LOC_TYPEDEF && SYMBOL_CLASS (sym) != LOC_BLOCK && SYMBOL_CLASS (sym) != LOC_CONST && SYMBOL_CLASS (sym) != LOC_UNRESOLVED && type_name != NULL && strcmp (type_name, "exception") == 0); } /* Given a global symbol SYM, return non-zero iff SYM is a non-standard Ada exception object. This matches all exceptions except the ones defined by the Ada language. */ static int ada_is_non_standard_exception_sym (struct symbol *sym) { int i; if (!ada_is_exception_sym (sym)) return 0; for (i = 0; i < ARRAY_SIZE (standard_exc); i++) if (strcmp (sym->linkage_name (), standard_exc[i]) == 0) return 0; /* A standard exception. */ /* Numeric_Error is also a standard exception, so exclude it. See the STANDARD_EXC description for more details as to why this exception is not listed in that array. */ if (strcmp (sym->linkage_name (), "numeric_error") == 0) return 0; return 1; } /* A helper function for std::sort, comparing two struct ada_exc_info objects. The comparison is determined first by exception name, and then by exception address. */ bool ada_exc_info::operator< (const ada_exc_info &other) const { int result; result = strcmp (name, other.name); if (result < 0) return true; if (result == 0 && addr < other.addr) return true; return false; } bool ada_exc_info::operator== (const ada_exc_info &other) const { return addr == other.addr && strcmp (name, other.name) == 0; } /* Sort EXCEPTIONS using compare_ada_exception_info as the comparison routine, but keeping the first SKIP elements untouched. All duplicates are also removed. */ static void sort_remove_dups_ada_exceptions_list (std::vector *exceptions, int skip) { std::sort (exceptions->begin () + skip, exceptions->end ()); exceptions->erase (std::unique (exceptions->begin () + skip, exceptions->end ()), exceptions->end ()); } /* Add all exceptions defined by the Ada standard whose name match a regular expression. If PREG is not NULL, then this regexp_t object is used to perform the symbol name matching. Otherwise, no name-based filtering is performed. EXCEPTIONS is a vector of exceptions to which matching exceptions gets pushed. */ static void ada_add_standard_exceptions (compiled_regex *preg, std::vector *exceptions) { int i; for (i = 0; i < ARRAY_SIZE (standard_exc); i++) { if (preg == NULL || preg->exec (standard_exc[i], 0, NULL, 0) == 0) { struct bound_minimal_symbol msymbol = ada_lookup_simple_minsym (standard_exc[i]); if (msymbol.minsym != NULL) { struct ada_exc_info info = {standard_exc[i], BMSYMBOL_VALUE_ADDRESS (msymbol)}; exceptions->push_back (info); } } } } /* Add all Ada exceptions defined locally and accessible from the given FRAME. If PREG is not NULL, then this regexp_t object is used to perform the symbol name matching. Otherwise, no name-based filtering is performed. EXCEPTIONS is a vector of exceptions to which matching exceptions gets pushed. */ static void ada_add_exceptions_from_frame (compiled_regex *preg, struct frame_info *frame, std::vector *exceptions) { const struct block *block = get_frame_block (frame, 0); while (block != 0) { struct block_iterator iter; struct symbol *sym; ALL_BLOCK_SYMBOLS (block, iter, sym) { switch (SYMBOL_CLASS (sym)) { case LOC_TYPEDEF: case LOC_BLOCK: case LOC_CONST: break; default: if (ada_is_exception_sym (sym)) { struct ada_exc_info info = {sym->print_name (), SYMBOL_VALUE_ADDRESS (sym)}; exceptions->push_back (info); } } } if (BLOCK_FUNCTION (block) != NULL) break; block = BLOCK_SUPERBLOCK (block); } } /* Return true if NAME matches PREG or if PREG is NULL. */ static bool name_matches_regex (const char *name, compiled_regex *preg) { return (preg == NULL || preg->exec (ada_decode (name).c_str (), 0, NULL, 0) == 0); } /* Add all exceptions defined globally whose name name match a regular expression, excluding standard exceptions. The reason we exclude standard exceptions is that they need to be handled separately: Standard exceptions are defined inside a runtime unit which is normally not compiled with debugging info, and thus usually do not show up in our symbol search. However, if the unit was in fact built with debugging info, we need to exclude them because they would duplicate the entry we found during the special loop that specifically searches for those standard exceptions. If PREG is not NULL, then this regexp_t object is used to perform the symbol name matching. Otherwise, no name-based filtering is performed. EXCEPTIONS is a vector of exceptions to which matching exceptions gets pushed. */ static void ada_add_global_exceptions (compiled_regex *preg, std::vector *exceptions) { /* In Ada, the symbol "search name" is a linkage name, whereas the regular expression used to do the matching refers to the natural name. So match against the decoded name. */ expand_symtabs_matching (NULL, lookup_name_info::match_any (), [&] (const char *search_name) { std::string decoded = ada_decode (search_name); return name_matches_regex (decoded.c_str (), preg); }, NULL, VARIABLES_DOMAIN); for (objfile *objfile : current_program_space->objfiles ()) { for (compunit_symtab *s : objfile->compunits ()) { const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (s); int i; for (i = GLOBAL_BLOCK; i <= STATIC_BLOCK; i++) { const struct block *b = BLOCKVECTOR_BLOCK (bv, i); struct block_iterator iter; struct symbol *sym; ALL_BLOCK_SYMBOLS (b, iter, sym) if (ada_is_non_standard_exception_sym (sym) && name_matches_regex (sym->natural_name (), preg)) { struct ada_exc_info info = {sym->print_name (), SYMBOL_VALUE_ADDRESS (sym)}; exceptions->push_back (info); } } } } } /* Implements ada_exceptions_list with the regular expression passed as a regex_t, rather than a string. If not NULL, PREG is used to filter out exceptions whose names do not match. Otherwise, all exceptions are listed. */ static std::vector ada_exceptions_list_1 (compiled_regex *preg) { std::vector result; int prev_len; /* First, list the known standard exceptions. These exceptions need to be handled separately, as they are usually defined in runtime units that have been compiled without debugging info. */ ada_add_standard_exceptions (preg, &result); /* Next, find all exceptions whose scope is local and accessible from the currently selected frame. */ if (has_stack_frames ()) { prev_len = result.size (); ada_add_exceptions_from_frame (preg, get_selected_frame (NULL), &result); if (result.size () > prev_len) sort_remove_dups_ada_exceptions_list (&result, prev_len); } /* Add all exceptions whose scope is global. */ prev_len = result.size (); ada_add_global_exceptions (preg, &result); if (result.size () > prev_len) sort_remove_dups_ada_exceptions_list (&result, prev_len); return result; } /* Return a vector of ada_exc_info. If REGEXP is NULL, all exceptions are included in the result. Otherwise, it should contain a valid regular expression, and only the exceptions whose names match that regular expression are included in the result. The exceptions are sorted in the following order: - Standard exceptions (defined by the Ada language), in alphabetical order; - Exceptions only visible from the current frame, in alphabetical order; - Exceptions whose scope is global, in alphabetical order. */ std::vector ada_exceptions_list (const char *regexp) { if (regexp == NULL) return ada_exceptions_list_1 (NULL); compiled_regex reg (regexp, REG_NOSUB, _("invalid regular expression")); return ada_exceptions_list_1 (®); } /* Implement the "info exceptions" command. */ static void info_exceptions_command (const char *regexp, int from_tty) { struct gdbarch *gdbarch = get_current_arch (); std::vector exceptions = ada_exceptions_list (regexp); if (regexp != NULL) printf_filtered (_("All Ada exceptions matching regular expression \"%s\":\n"), regexp); else printf_filtered (_("All defined Ada exceptions:\n")); for (const ada_exc_info &info : exceptions) printf_filtered ("%s: %s\n", info.name, paddress (gdbarch, info.addr)); } /* Operators */ /* Information about operators given special treatment in functions below. */ /* Format: OP_DEFN (, , <# args>, ). */ #define ADA_OPERATORS \ OP_DEFN (OP_VAR_VALUE, 4, 0, 0) \ OP_DEFN (BINOP_IN_BOUNDS, 3, 2, 0) \ OP_DEFN (TERNOP_IN_RANGE, 1, 3, 0) \ OP_DEFN (OP_ATR_FIRST, 1, 2, 0) \ OP_DEFN (OP_ATR_LAST, 1, 2, 0) \ OP_DEFN (OP_ATR_LENGTH, 1, 2, 0) \ OP_DEFN (OP_ATR_IMAGE, 1, 2, 0) \ OP_DEFN (OP_ATR_MAX, 1, 3, 0) \ OP_DEFN (OP_ATR_MIN, 1, 3, 0) \ OP_DEFN (OP_ATR_MODULUS, 1, 1, 0) \ OP_DEFN (OP_ATR_POS, 1, 2, 0) \ OP_DEFN (OP_ATR_SIZE, 1, 1, 0) \ OP_DEFN (OP_ATR_TAG, 1, 1, 0) \ OP_DEFN (OP_ATR_VAL, 1, 2, 0) \ OP_DEFN (UNOP_QUAL, 3, 1, 0) \ OP_DEFN (UNOP_IN_RANGE, 3, 1, 0) \ OP_DEFN (OP_OTHERS, 1, 1, 0) \ OP_DEFN (OP_POSITIONAL, 3, 1, 0) \ OP_DEFN (OP_DISCRETE_RANGE, 1, 2, 0) static void ada_operator_length (const struct expression *exp, int pc, int *oplenp, int *argsp) { switch (exp->elts[pc - 1].opcode) { default: operator_length_standard (exp, pc, oplenp, argsp); break; #define OP_DEFN(op, len, args, binop) \ case op: *oplenp = len; *argsp = args; break; ADA_OPERATORS; #undef OP_DEFN case OP_AGGREGATE: *oplenp = 3; *argsp = longest_to_int (exp->elts[pc - 2].longconst); break; case OP_CHOICES: *oplenp = 3; *argsp = longest_to_int (exp->elts[pc - 2].longconst) + 1; break; } } /* Implementation of the exp_descriptor method operator_check. */ static int ada_operator_check (struct expression *exp, int pos, int (*objfile_func) (struct objfile *objfile, void *data), void *data) { const union exp_element *const elts = exp->elts; struct type *type = NULL; switch (elts[pos].opcode) { case UNOP_IN_RANGE: case UNOP_QUAL: type = elts[pos + 1].type; break; default: return operator_check_standard (exp, pos, objfile_func, data); } /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */ if (type && TYPE_OBJFILE (type) && (*objfile_func) (TYPE_OBJFILE (type), data)) return 1; return 0; } static const char * ada_op_name (enum exp_opcode opcode) { switch (opcode) { default: return op_name_standard (opcode); #define OP_DEFN(op, len, args, binop) case op: return #op; ADA_OPERATORS; #undef OP_DEFN case OP_AGGREGATE: return "OP_AGGREGATE"; case OP_CHOICES: return "OP_CHOICES"; case OP_NAME: return "OP_NAME"; } } /* As for operator_length, but assumes PC is pointing at the first element of the operator, and gives meaningful results only for the Ada-specific operators, returning 0 for *OPLENP and *ARGSP otherwise. */ static void ada_forward_operator_length (struct expression *exp, int pc, int *oplenp, int *argsp) { switch (exp->elts[pc].opcode) { default: *oplenp = *argsp = 0; break; #define OP_DEFN(op, len, args, binop) \ case op: *oplenp = len; *argsp = args; break; ADA_OPERATORS; #undef OP_DEFN case OP_AGGREGATE: *oplenp = 3; *argsp = longest_to_int (exp->elts[pc + 1].longconst); break; case OP_CHOICES: *oplenp = 3; *argsp = longest_to_int (exp->elts[pc + 1].longconst) + 1; break; case OP_STRING: case OP_NAME: { int len = longest_to_int (exp->elts[pc + 1].longconst); *oplenp = 4 + BYTES_TO_EXP_ELEM (len + 1); *argsp = 0; break; } } } static int ada_dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt) { enum exp_opcode op = exp->elts[elt].opcode; int oplen, nargs; int pc = elt; int i; ada_forward_operator_length (exp, elt, &oplen, &nargs); switch (op) { /* Ada attributes ('Foo). */ case OP_ATR_FIRST: case OP_ATR_LAST: case OP_ATR_LENGTH: case OP_ATR_IMAGE: case OP_ATR_MAX: case OP_ATR_MIN: case OP_ATR_MODULUS: case OP_ATR_POS: case OP_ATR_SIZE: case OP_ATR_TAG: case OP_ATR_VAL: break; case UNOP_IN_RANGE: case UNOP_QUAL: /* XXX: gdb_sprint_host_address, type_sprint */ fprintf_filtered (stream, _("Type @")); gdb_print_host_address (exp->elts[pc + 1].type, stream); fprintf_filtered (stream, " ("); type_print (exp->elts[pc + 1].type, NULL, stream, 0); fprintf_filtered (stream, ")"); break; case BINOP_IN_BOUNDS: fprintf_filtered (stream, " (%d)", longest_to_int (exp->elts[pc + 2].longconst)); break; case TERNOP_IN_RANGE: break; case OP_AGGREGATE: case OP_OTHERS: case OP_DISCRETE_RANGE: case OP_POSITIONAL: case OP_CHOICES: break; case OP_NAME: case OP_STRING: { char *name = &exp->elts[elt + 2].string; int len = longest_to_int (exp->elts[elt + 1].longconst); fprintf_filtered (stream, "Text: `%.*s'", len, name); break; } default: return dump_subexp_body_standard (exp, stream, elt); } elt += oplen; for (i = 0; i < nargs; i += 1) elt = dump_subexp (exp, stream, elt); return elt; } /* The Ada extension of print_subexp (q.v.). */ static void ada_print_subexp (struct expression *exp, int *pos, struct ui_file *stream, enum precedence prec) { int oplen, nargs, i; int pc = *pos; enum exp_opcode op = exp->elts[pc].opcode; ada_forward_operator_length (exp, pc, &oplen, &nargs); *pos += oplen; switch (op) { default: *pos -= oplen; print_subexp_standard (exp, pos, stream, prec); return; case OP_VAR_VALUE: fputs_filtered (exp->elts[pc + 2].symbol->natural_name (), stream); return; case BINOP_IN_BOUNDS: /* XXX: sprint_subexp */ print_subexp (exp, pos, stream, PREC_SUFFIX); fputs_filtered (" in ", stream); print_subexp (exp, pos, stream, PREC_SUFFIX); fputs_filtered ("'range", stream); if (exp->elts[pc + 1].longconst > 1) fprintf_filtered (stream, "(%ld)", (long) exp->elts[pc + 1].longconst); return; case TERNOP_IN_RANGE: if (prec >= PREC_EQUAL) fputs_filtered ("(", stream); /* XXX: sprint_subexp */ print_subexp (exp, pos, stream, PREC_SUFFIX); fputs_filtered (" in ", stream); print_subexp (exp, pos, stream, PREC_EQUAL); fputs_filtered (" .. ", stream); print_subexp (exp, pos, stream, PREC_EQUAL); if (prec >= PREC_EQUAL) fputs_filtered (")", stream); return; case OP_ATR_FIRST: case OP_ATR_LAST: case OP_ATR_LENGTH: case OP_ATR_IMAGE: case OP_ATR_MAX: case OP_ATR_MIN: case OP_ATR_MODULUS: case OP_ATR_POS: case OP_ATR_SIZE: case OP_ATR_TAG: case OP_ATR_VAL: if (exp->elts[*pos].opcode == OP_TYPE) { if (TYPE_CODE (exp->elts[*pos + 1].type) != TYPE_CODE_VOID) LA_PRINT_TYPE (exp->elts[*pos + 1].type, "", stream, 0, 0, &type_print_raw_options); *pos += 3; } else print_subexp (exp, pos, stream, PREC_SUFFIX); fprintf_filtered (stream, "'%s", ada_attribute_name (op)); if (nargs > 1) { int tem; for (tem = 1; tem < nargs; tem += 1) { fputs_filtered ((tem == 1) ? " (" : ", ", stream); print_subexp (exp, pos, stream, PREC_ABOVE_COMMA); } fputs_filtered (")", stream); } return; case UNOP_QUAL: type_print (exp->elts[pc + 1].type, "", stream, 0); fputs_filtered ("'(", stream); print_subexp (exp, pos, stream, PREC_PREFIX); fputs_filtered (")", stream); return; case UNOP_IN_RANGE: /* XXX: sprint_subexp */ print_subexp (exp, pos, stream, PREC_SUFFIX); fputs_filtered (" in ", stream); LA_PRINT_TYPE (exp->elts[pc + 1].type, "", stream, 1, 0, &type_print_raw_options); return; case OP_DISCRETE_RANGE: print_subexp (exp, pos, stream, PREC_SUFFIX); fputs_filtered ("..", stream); print_subexp (exp, pos, stream, PREC_SUFFIX); return; case OP_OTHERS: fputs_filtered ("others => ", stream); print_subexp (exp, pos, stream, PREC_SUFFIX); return; case OP_CHOICES: for (i = 0; i < nargs-1; i += 1) { if (i > 0) fputs_filtered ("|", stream); print_subexp (exp, pos, stream, PREC_SUFFIX); } fputs_filtered (" => ", stream); print_subexp (exp, pos, stream, PREC_SUFFIX); return; case OP_POSITIONAL: print_subexp (exp, pos, stream, PREC_SUFFIX); return; case OP_AGGREGATE: fputs_filtered ("(", stream); for (i = 0; i < nargs; i += 1) { if (i > 0) fputs_filtered (", ", stream); print_subexp (exp, pos, stream, PREC_SUFFIX); } fputs_filtered (")", stream); return; } } /* Table mapping opcodes into strings for printing operators and precedences of the operators. */ static const struct op_print ada_op_print_tab[] = { {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, {"or else", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, {"and then", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, {"=", BINOP_EQUAL, PREC_EQUAL, 0}, {"/=", BINOP_NOTEQUAL, PREC_EQUAL, 0}, {"<=", BINOP_LEQ, PREC_ORDER, 0}, {">=", BINOP_GEQ, PREC_ORDER, 0}, {">", BINOP_GTR, PREC_ORDER, 0}, {"<", BINOP_LESS, PREC_ORDER, 0}, {">>", BINOP_RSH, PREC_SHIFT, 0}, {"<<", BINOP_LSH, PREC_SHIFT, 0}, {"+", BINOP_ADD, PREC_ADD, 0}, {"-", BINOP_SUB, PREC_ADD, 0}, {"&", BINOP_CONCAT, PREC_ADD, 0}, {"*", BINOP_MUL, PREC_MUL, 0}, {"/", BINOP_DIV, PREC_MUL, 0}, {"rem", BINOP_REM, PREC_MUL, 0}, {"mod", BINOP_MOD, PREC_MUL, 0}, {"**", BINOP_EXP, PREC_REPEAT, 0}, {"@", BINOP_REPEAT, PREC_REPEAT, 0}, {"-", UNOP_NEG, PREC_PREFIX, 0}, {"+", UNOP_PLUS, PREC_PREFIX, 0}, {"not ", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, {"not ", UNOP_COMPLEMENT, PREC_PREFIX, 0}, {"abs ", UNOP_ABS, PREC_PREFIX, 0}, {".all", UNOP_IND, PREC_SUFFIX, 1}, {"'access", UNOP_ADDR, PREC_SUFFIX, 1}, {"'size", OP_ATR_SIZE, PREC_SUFFIX, 1}, {NULL, OP_NULL, PREC_SUFFIX, 0} }; enum ada_primitive_types { ada_primitive_type_int, ada_primitive_type_long, ada_primitive_type_short, ada_primitive_type_char, ada_primitive_type_float, ada_primitive_type_double, ada_primitive_type_void, ada_primitive_type_long_long, ada_primitive_type_long_double, ada_primitive_type_natural, ada_primitive_type_positive, ada_primitive_type_system_address, ada_primitive_type_storage_offset, nr_ada_primitive_types }; static void ada_language_arch_info (struct gdbarch *gdbarch, struct language_arch_info *lai) { const struct builtin_type *builtin = builtin_type (gdbarch); lai->primitive_type_vector = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_ada_primitive_types + 1, struct type *); lai->primitive_type_vector [ada_primitive_type_int] = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "integer"); lai->primitive_type_vector [ada_primitive_type_long] = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "long_integer"); lai->primitive_type_vector [ada_primitive_type_short] = arch_integer_type (gdbarch, gdbarch_short_bit (gdbarch), 0, "short_integer"); lai->string_char_type = lai->primitive_type_vector [ada_primitive_type_char] = arch_character_type (gdbarch, TARGET_CHAR_BIT, 0, "character"); lai->primitive_type_vector [ada_primitive_type_float] = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "float", gdbarch_float_format (gdbarch)); lai->primitive_type_vector [ada_primitive_type_double] = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch), "long_float", gdbarch_double_format (gdbarch)); lai->primitive_type_vector [ada_primitive_type_long_long] = arch_integer_type (gdbarch, gdbarch_long_long_bit (gdbarch), 0, "long_long_integer"); lai->primitive_type_vector [ada_primitive_type_long_double] = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch), "long_long_float", gdbarch_long_double_format (gdbarch)); lai->primitive_type_vector [ada_primitive_type_natural] = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "natural"); lai->primitive_type_vector [ada_primitive_type_positive] = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "positive"); lai->primitive_type_vector [ada_primitive_type_void] = builtin->builtin_void; lai->primitive_type_vector [ada_primitive_type_system_address] = lookup_pointer_type (arch_type (gdbarch, TYPE_CODE_VOID, TARGET_CHAR_BIT, "void")); TYPE_NAME (lai->primitive_type_vector [ada_primitive_type_system_address]) = "system__address"; /* Create the equivalent of the System.Storage_Elements.Storage_Offset type. This is a signed integral type whose size is the same as the size of addresses. */ { unsigned int addr_length = TYPE_LENGTH (lai->primitive_type_vector [ada_primitive_type_system_address]); lai->primitive_type_vector [ada_primitive_type_storage_offset] = arch_integer_type (gdbarch, addr_length * HOST_CHAR_BIT, 0, "storage_offset"); } lai->bool_type_symbol = NULL; lai->bool_type_default = builtin->builtin_bool; } /* Language vector */ /* Not really used, but needed in the ada_language_defn. */ static void emit_char (int c, struct type *type, struct ui_file *stream, int quoter) { ada_emit_char (c, type, stream, quoter, 1); } static int parse (struct parser_state *ps) { warnings_issued = 0; return ada_parse (ps); } static const struct exp_descriptor ada_exp_descriptor = { ada_print_subexp, ada_operator_length, ada_operator_check, ada_op_name, ada_dump_subexp_body, ada_evaluate_subexp }; /* symbol_name_matcher_ftype adapter for wild_match. */ static bool do_wild_match (const char *symbol_search_name, const lookup_name_info &lookup_name, completion_match_result *comp_match_res) { return wild_match (symbol_search_name, ada_lookup_name (lookup_name)); } /* symbol_name_matcher_ftype adapter for full_match. */ static bool do_full_match (const char *symbol_search_name, const lookup_name_info &lookup_name, completion_match_result *comp_match_res) { return full_match (symbol_search_name, ada_lookup_name (lookup_name)); } /* symbol_name_matcher_ftype for exact (verbatim) matches. */ static bool do_exact_match (const char *symbol_search_name, const lookup_name_info &lookup_name, completion_match_result *comp_match_res) { return strcmp (symbol_search_name, ada_lookup_name (lookup_name)) == 0; } /* Build the Ada lookup name for LOOKUP_NAME. */ ada_lookup_name_info::ada_lookup_name_info (const lookup_name_info &lookup_name) { const std::string &user_name = lookup_name.name (); if (user_name[0] == '<') { if (user_name.back () == '>') m_encoded_name = user_name.substr (1, user_name.size () - 2); else m_encoded_name = user_name.substr (1, user_name.size () - 1); m_encoded_p = true; m_verbatim_p = true; m_wild_match_p = false; m_standard_p = false; } else { m_verbatim_p = false; m_encoded_p = user_name.find ("__") != std::string::npos; if (!m_encoded_p) { const char *folded = ada_fold_name (user_name.c_str ()); const char *encoded = ada_encode_1 (folded, false); if (encoded != NULL) m_encoded_name = encoded; else m_encoded_name = user_name; } else m_encoded_name = user_name; /* Handle the 'package Standard' special case. See description of m_standard_p. */ if (startswith (m_encoded_name.c_str (), "standard__")) { m_encoded_name = m_encoded_name.substr (sizeof ("standard__") - 1); m_standard_p = true; } else m_standard_p = false; /* If the name contains a ".", then the user is entering a fully qualified entity name, and the match must not be done in wild mode. Similarly, if the user wants to complete what looks like an encoded name, the match must not be done in wild mode. Also, in the standard__ special case always do non-wild matching. */ m_wild_match_p = (lookup_name.match_type () != symbol_name_match_type::FULL && !m_encoded_p && !m_standard_p && user_name.find ('.') == std::string::npos); } } /* symbol_name_matcher_ftype method for Ada. This only handles completion mode. */ static bool ada_symbol_name_matches (const char *symbol_search_name, const lookup_name_info &lookup_name, completion_match_result *comp_match_res) { return lookup_name.ada ().matches (symbol_search_name, lookup_name.match_type (), comp_match_res); } /* A name matcher that matches the symbol name exactly, with strcmp. */ static bool literal_symbol_name_matcher (const char *symbol_search_name, const lookup_name_info &lookup_name, completion_match_result *comp_match_res) { const std::string &name = lookup_name.name (); int cmp = (lookup_name.completion_mode () ? strncmp (symbol_search_name, name.c_str (), name.size ()) : strcmp (symbol_search_name, name.c_str ())); if (cmp == 0) { if (comp_match_res != NULL) comp_match_res->set_match (symbol_search_name); return true; } else return false; } /* Implement the "la_get_symbol_name_matcher" language_defn method for Ada. */ static symbol_name_matcher_ftype * ada_get_symbol_name_matcher (const lookup_name_info &lookup_name) { if (lookup_name.match_type () == symbol_name_match_type::SEARCH_NAME) return literal_symbol_name_matcher; if (lookup_name.completion_mode ()) return ada_symbol_name_matches; else { if (lookup_name.ada ().wild_match_p ()) return do_wild_match; else if (lookup_name.ada ().verbatim_p ()) return do_exact_match; else return do_full_match; } } /* Implement the "la_read_var_value" language_defn method for Ada. */ static struct value * ada_read_var_value (struct symbol *var, const struct block *var_block, struct frame_info *frame) { /* The only case where default_read_var_value is not sufficient is when VAR is a renaming... */ if (frame != nullptr) { const struct block *frame_block = get_frame_block (frame, NULL); if (frame_block != nullptr && ada_is_renaming_symbol (var)) return ada_read_renaming_var_value (var, frame_block); } /* This is a typical case where we expect the default_read_var_value function to work. */ return default_read_var_value (var, var_block, frame); } static const char *ada_extensions[] = { ".adb", ".ads", ".a", ".ada", ".dg", NULL }; extern const struct language_defn ada_language_defn = { "ada", /* Language name */ "Ada", language_ada, range_check_off, case_sensitive_on, /* Yes, Ada is case-insensitive, but that's not quite what this means. */ array_row_major, macro_expansion_no, ada_extensions, &ada_exp_descriptor, parse, resolve, ada_printchar, /* Print a character constant */ ada_printstr, /* Function to print string constant */ emit_char, /* Function to print single char (not used) */ ada_print_type, /* Print a type using appropriate syntax */ ada_print_typedef, /* Print a typedef using appropriate syntax */ ada_val_print, /* Print a value using appropriate syntax */ ada_value_print, /* Print a top-level value */ ada_read_var_value, /* la_read_var_value */ NULL, /* Language specific skip_trampoline */ NULL, /* name_of_this */ true, /* la_store_sym_names_in_linkage_form_p */ ada_lookup_symbol_nonlocal, /* Looking up non-local symbols. */ basic_lookup_transparent_type, /* lookup_transparent_type */ ada_la_decode, /* Language specific symbol demangler */ ada_sniff_from_mangled_name, NULL, /* Language specific class_name_from_physname */ ada_op_print_tab, /* expression operators for printing */ 0, /* c-style arrays */ 1, /* String lower bound */ ada_get_gdb_completer_word_break_characters, ada_collect_symbol_completion_matches, ada_language_arch_info, ada_print_array_index, default_pass_by_reference, ada_watch_location_expression, ada_get_symbol_name_matcher, /* la_get_symbol_name_matcher */ ada_iterate_over_symbols, default_search_name_hash, &ada_varobj_ops, NULL, NULL, ada_is_string_type, "(...)" /* la_struct_too_deep_ellipsis */ }; /* Command-list for the "set/show ada" prefix command. */ static struct cmd_list_element *set_ada_list; static struct cmd_list_element *show_ada_list; /* Implement the "set ada" prefix command. */ static void set_ada_command (const char *arg, int from_tty) { printf_unfiltered (_(\ "\"set ada\" must be followed by the name of a setting.\n")); help_list (set_ada_list, "set ada ", all_commands, gdb_stdout); } /* Implement the "show ada" prefix command. */ static void show_ada_command (const char *args, int from_tty) { cmd_show_list (show_ada_list, from_tty, ""); } static void initialize_ada_catchpoint_ops (void) { struct breakpoint_ops *ops; initialize_breakpoint_ops (); ops = &catch_exception_breakpoint_ops; *ops = bkpt_breakpoint_ops; ops->allocate_location = allocate_location_exception; ops->re_set = re_set_exception; ops->check_status = check_status_exception; ops->print_it = print_it_exception; ops->print_one = print_one_exception; ops->print_mention = print_mention_exception; ops->print_recreate = print_recreate_exception; ops = &catch_exception_unhandled_breakpoint_ops; *ops = bkpt_breakpoint_ops; ops->allocate_location = allocate_location_exception; ops->re_set = re_set_exception; ops->check_status = check_status_exception; ops->print_it = print_it_exception; ops->print_one = print_one_exception; ops->print_mention = print_mention_exception; ops->print_recreate = print_recreate_exception; ops = &catch_assert_breakpoint_ops; *ops = bkpt_breakpoint_ops; ops->allocate_location = allocate_location_exception; ops->re_set = re_set_exception; ops->check_status = check_status_exception; ops->print_it = print_it_exception; ops->print_one = print_one_exception; ops->print_mention = print_mention_exception; ops->print_recreate = print_recreate_exception; ops = &catch_handlers_breakpoint_ops; *ops = bkpt_breakpoint_ops; ops->allocate_location = allocate_location_exception; ops->re_set = re_set_exception; ops->check_status = check_status_exception; ops->print_it = print_it_exception; ops->print_one = print_one_exception; ops->print_mention = print_mention_exception; ops->print_recreate = print_recreate_exception; } /* This module's 'new_objfile' observer. */ static void ada_new_objfile_observer (struct objfile *objfile) { ada_clear_symbol_cache (); } /* This module's 'free_objfile' observer. */ static void ada_free_objfile_observer (struct objfile *objfile) { ada_clear_symbol_cache (); } void _initialize_ada_language (void) { initialize_ada_catchpoint_ops (); add_prefix_cmd ("ada", no_class, set_ada_command, _("Prefix command for changing Ada-specific settings."), &set_ada_list, "set ada ", 0, &setlist); add_prefix_cmd ("ada", no_class, show_ada_command, _("Generic command for showing Ada-specific settings."), &show_ada_list, "show ada ", 0, &showlist); add_setshow_boolean_cmd ("trust-PAD-over-XVS", class_obscure, &trust_pad_over_xvs, _("\ Enable or disable an optimization trusting PAD types over XVS types."), _("\ Show whether an optimization trusting PAD types over XVS types is activated."), _("\ This is related to the encoding used by the GNAT compiler. The debugger\n\ should normally trust the contents of PAD types, but certain older versions\n\ of GNAT have a bug that sometimes causes the information in the PAD type\n\ to be incorrect. Turning this setting \"off\" allows the debugger to\n\ work around this bug. It is always safe to turn this option \"off\", but\n\ this incurs a slight performance penalty, so it is recommended to NOT change\n\ this option to \"off\" unless necessary."), NULL, NULL, &set_ada_list, &show_ada_list); add_setshow_boolean_cmd ("print-signatures", class_vars, &print_signatures, _("\ Enable or disable the output of formal and return types for functions in the \ overloads selection menu."), _("\ Show whether the output of formal and return types for functions in the \ overloads selection menu is activated."), NULL, NULL, NULL, &set_ada_list, &show_ada_list); add_catch_command ("exception", _("\ Catch Ada exceptions, when raised.\n\ Usage: catch exception [ARG] [if CONDITION]\n\ Without any argument, stop when any Ada exception is raised.\n\ If ARG is \"unhandled\" (without the quotes), only stop when the exception\n\ being raised does not have a handler (and will therefore lead to the task's\n\ termination).\n\ Otherwise, the catchpoint only stops when the name of the exception being\n\ raised is the same as ARG.\n\ CONDITION is a boolean expression that is evaluated to see whether the\n\ exception should cause a stop."), catch_ada_exception_command, catch_ada_completer, CATCH_PERMANENT, CATCH_TEMPORARY); add_catch_command ("handlers", _("\ Catch Ada exceptions, when handled.\n\ Usage: catch handlers [ARG] [if CONDITION]\n\ Without any argument, stop when any Ada exception is handled.\n\ With an argument, catch only exceptions with the given name.\n\ CONDITION is a boolean expression that is evaluated to see whether the\n\ exception should cause a stop."), catch_ada_handlers_command, catch_ada_completer, CATCH_PERMANENT, CATCH_TEMPORARY); add_catch_command ("assert", _("\ Catch failed Ada assertions, when raised.\n\ Usage: catch assert [if CONDITION]\n\ CONDITION is a boolean expression that is evaluated to see whether the\n\ exception should cause a stop."), catch_assert_command, NULL, CATCH_PERMANENT, CATCH_TEMPORARY); varsize_limit = 65536; add_setshow_uinteger_cmd ("varsize-limit", class_support, &varsize_limit, _("\ Set the maximum number of bytes allowed in a variable-size object."), _("\ Show the maximum number of bytes allowed in a variable-size object."), _("\ Attempts to access an object whose size is not a compile-time constant\n\ and exceeds this limit will cause an error."), NULL, NULL, &setlist, &showlist); add_info ("exceptions", info_exceptions_command, _("\ List all Ada exception names.\n\ Usage: info exceptions [REGEXP]\n\ If a regular expression is passed as an argument, only those matching\n\ the regular expression are listed.")); add_prefix_cmd ("ada", class_maintenance, maint_set_ada_cmd, _("Set Ada maintenance-related variables."), &maint_set_ada_cmdlist, "maintenance set ada ", 0/*allow-unknown*/, &maintenance_set_cmdlist); add_prefix_cmd ("ada", class_maintenance, maint_show_ada_cmd, _("Show Ada maintenance-related variables."), &maint_show_ada_cmdlist, "maintenance show ada ", 0/*allow-unknown*/, &maintenance_show_cmdlist); add_setshow_boolean_cmd ("ignore-descriptive-types", class_maintenance, &ada_ignore_descriptive_types_p, _("Set whether descriptive types generated by GNAT should be ignored."), _("Show whether descriptive types generated by GNAT should be ignored."), _("\ When enabled, the debugger will stop using the DW_AT_GNAT_descriptive_type\n\ DWARF attribute."), NULL, NULL, &maint_set_ada_cmdlist, &maint_show_ada_cmdlist); decoded_names_store = htab_create_alloc (256, htab_hash_string, streq_hash, NULL, xcalloc, xfree); /* The ada-lang observers. */ gdb::observers::new_objfile.attach (ada_new_objfile_observer); gdb::observers::free_objfile.attach (ada_free_objfile_observer); gdb::observers::inferior_exit.attach (ada_inferior_exit); }