/* Modula 2 language support routines for GDB, the GNU debugger. Copyright (C) 1992-2017 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 <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "symtab.h" #include "gdbtypes.h" #include "expression.h" #include "parser-defs.h" #include "language.h" #include "varobj.h" #include "m2-lang.h" #include "c-lang.h" #include "valprint.h" static void m2_printchar (int, struct type *, struct ui_file *); static void m2_emit_char (int, struct type *, struct ui_file *, int); /* Print the character C on STREAM as part of the contents of a literal string whose delimiter is QUOTER. Note that that format for printing characters and strings is language specific. FIXME: This is a copy of the same function from c-exp.y. It should be replaced with a true Modula version. */ static void m2_emit_char (int c, struct type *type, struct ui_file *stream, int quoter) { c &= 0xFF; /* Avoid sign bit follies. */ if (PRINT_LITERAL_FORM (c)) { if (c == '\\' || c == quoter) { fputs_filtered ("\\", stream); } fprintf_filtered (stream, "%c", c); } else { switch (c) { case '\n': fputs_filtered ("\\n", stream); break; case '\b': fputs_filtered ("\\b", stream); break; case '\t': fputs_filtered ("\\t", stream); break; case '\f': fputs_filtered ("\\f", stream); break; case '\r': fputs_filtered ("\\r", stream); break; case '\033': fputs_filtered ("\\e", stream); break; case '\007': fputs_filtered ("\\a", stream); break; default: fprintf_filtered (stream, "\\%.3o", (unsigned int) c); break; } } } /* FIXME: This is a copy of the same function from c-exp.y. It should be replaced with a true Modula version. */ static void m2_printchar (int c, struct type *type, struct ui_file *stream) { fputs_filtered ("'", stream); LA_EMIT_CHAR (c, type, stream, '\''); fputs_filtered ("'", stream); } /* Print the character string STRING, printing at most LENGTH characters. Printing stops early if the number hits print_max; repeat counts are printed as appropriate. Print ellipses at the end if we had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. FIXME: This is a copy of the same function from c-exp.y. It should be replaced with a true Modula version. */ static void m2_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string, unsigned int length, const char *encoding, int force_ellipses, const struct value_print_options *options) { unsigned int i; unsigned int things_printed = 0; int in_quotes = 0; int need_comma = 0; if (length == 0) { fputs_filtered ("\"\"", gdb_stdout); return; } for (i = 0; i < length && things_printed < options->print_max; ++i) { /* Position of the character we are examining to see whether it is repeated. */ unsigned int rep1; /* Number of repetitions we have detected so far. */ unsigned int reps; QUIT; if (need_comma) { fputs_filtered (", ", stream); need_comma = 0; } rep1 = i + 1; reps = 1; while (rep1 < length && string[rep1] == string[i]) { ++rep1; ++reps; } if (reps > options->repeat_count_threshold) { if (in_quotes) { fputs_filtered ("\", ", stream); in_quotes = 0; } m2_printchar (string[i], type, stream); fprintf_filtered (stream, " <repeats %u times>", reps); i = rep1 - 1; things_printed += options->repeat_count_threshold; need_comma = 1; } else { if (!in_quotes) { fputs_filtered ("\"", stream); in_quotes = 1; } LA_EMIT_CHAR (string[i], type, stream, '"'); ++things_printed; } } /* Terminate the quotes if necessary. */ if (in_quotes) fputs_filtered ("\"", stream); if (force_ellipses || i < length) fputs_filtered ("...", stream); } static struct value * evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp, int *pos, enum noside noside) { enum exp_opcode op = exp->elts[*pos].opcode; struct value *arg1; struct value *arg2; struct type *type; switch (op) { case UNOP_HIGH: (*pos)++; arg1 = evaluate_subexp_with_coercion (exp, pos, noside); if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) return arg1; else { arg1 = coerce_ref (arg1); type = check_typedef (value_type (arg1)); if (m2_is_unbounded_array (type)) { struct value *temp = arg1; type = TYPE_FIELD_TYPE (type, 1); /* i18n: Do not translate the "_m2_high" part! */ arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL, _("unbounded structure " "missing _m2_high field")); if (value_type (arg1) != type) arg1 = value_cast (type, arg1); } } return arg1; case BINOP_SUBSCRIPT: (*pos)++; arg1 = evaluate_subexp_with_coercion (exp, pos, noside); arg2 = evaluate_subexp_with_coercion (exp, pos, noside); if (noside == EVAL_SKIP) goto nosideret; /* If the user attempts to subscript something that is not an array or pointer type (like a plain int variable for example), then report this as an error. */ arg1 = coerce_ref (arg1); type = check_typedef (value_type (arg1)); if (m2_is_unbounded_array (type)) { struct value *temp = arg1; type = TYPE_FIELD_TYPE (type, 0); if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR)) { warning (_("internal error: unbounded " "array structure is unknown")); return evaluate_subexp_standard (expect_type, exp, pos, noside); } /* i18n: Do not translate the "_m2_contents" part! */ arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL, _("unbounded structure " "missing _m2_contents field")); if (value_type (arg1) != type) arg1 = value_cast (type, arg1); check_typedef (value_type (arg1)); return value_ind (value_ptradd (arg1, value_as_long (arg2))); } else if (TYPE_CODE (type) != TYPE_CODE_ARRAY) { if (TYPE_NAME (type)) error (_("cannot subscript something of type `%s'"), TYPE_NAME (type)); else error (_("cannot subscript requested type")); } if (noside == EVAL_AVOID_SIDE_EFFECTS) return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1)); else return value_subscript (arg1, value_as_long (arg2)); default: return evaluate_subexp_standard (expect_type, exp, pos, noside); } nosideret: return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); } /* Table of operators and their precedences for printing expressions. */ static const struct op_print m2_op_print_tab[] = { {"+", BINOP_ADD, PREC_ADD, 0}, {"+", UNOP_PLUS, PREC_PREFIX, 0}, {"-", BINOP_SUB, PREC_ADD, 0}, {"-", UNOP_NEG, PREC_PREFIX, 0}, {"*", BINOP_MUL, PREC_MUL, 0}, {"/", BINOP_DIV, PREC_MUL, 0}, {"DIV", BINOP_INTDIV, PREC_MUL, 0}, {"MOD", BINOP_REM, PREC_MUL, 0}, {":=", BINOP_ASSIGN, PREC_ASSIGN, 1}, {"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, {"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, {"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 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}, {"^", UNOP_IND, PREC_PREFIX, 0}, {"@", BINOP_REPEAT, PREC_REPEAT, 0}, {"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0}, {"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0}, {"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0}, {"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0}, {"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0}, {"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0}, {"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0}, {"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0}, {"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0}, {NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0} }; /* The built-in types of Modula-2. */ enum m2_primitive_types { m2_primitive_type_char, m2_primitive_type_int, m2_primitive_type_card, m2_primitive_type_real, m2_primitive_type_bool, nr_m2_primitive_types }; static void m2_language_arch_info (struct gdbarch *gdbarch, struct language_arch_info *lai) { const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch); lai->string_char_type = builtin->builtin_char; lai->primitive_type_vector = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1, struct type *); lai->primitive_type_vector [m2_primitive_type_char] = builtin->builtin_char; lai->primitive_type_vector [m2_primitive_type_int] = builtin->builtin_int; lai->primitive_type_vector [m2_primitive_type_card] = builtin->builtin_card; lai->primitive_type_vector [m2_primitive_type_real] = builtin->builtin_real; lai->primitive_type_vector [m2_primitive_type_bool] = builtin->builtin_bool; lai->bool_type_symbol = "BOOLEAN"; lai->bool_type_default = builtin->builtin_bool; } const struct exp_descriptor exp_descriptor_modula2 = { print_subexp_standard, operator_length_standard, operator_check_standard, op_name_standard, dump_subexp_body_standard, evaluate_subexp_modula2 }; extern const struct language_defn m2_language_defn = { "modula-2", "Modula-2", language_m2, range_check_on, case_sensitive_on, array_row_major, macro_expansion_no, NULL, &exp_descriptor_modula2, m2_parse, /* parser */ m2_yyerror, /* parser error function */ null_post_parser, m2_printchar, /* Print character constant */ m2_printstr, /* function to print string constant */ m2_emit_char, /* Function to print a single character */ m2_print_type, /* Print a type using appropriate syntax */ m2_print_typedef, /* Print a typedef using appropriate syntax */ m2_val_print, /* Print a value using appropriate syntax */ c_value_print, /* Print a top-level value */ default_read_var_value, /* la_read_var_value */ NULL, /* Language specific skip_trampoline */ NULL, /* name_of_this */ basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ basic_lookup_transparent_type,/* lookup_transparent_type */ NULL, /* Language specific symbol demangler */ NULL, NULL, /* Language specific class_name_from_physname */ m2_op_print_tab, /* expression operators for printing */ 0, /* arrays are first-class (not c-style) */ 0, /* String lower bound */ default_word_break_characters, default_collect_symbol_completion_matches, m2_language_arch_info, default_print_array_index, default_pass_by_reference, default_get_string, c_watch_location_expression, NULL, /* la_get_symbol_name_matcher */ iterate_over_symbols, default_search_name_hash, &default_varobj_ops, NULL, NULL, LANG_MAGIC }; static void * build_m2_types (struct gdbarch *gdbarch) { struct builtin_m2_type *builtin_m2_type = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type); /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */ builtin_m2_type->builtin_int = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER"); builtin_m2_type->builtin_card = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL"); builtin_m2_type->builtin_real = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL", gdbarch_float_format (gdbarch)); builtin_m2_type->builtin_char = arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR"); builtin_m2_type->builtin_bool = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN"); return builtin_m2_type; } static struct gdbarch_data *m2_type_data; const struct builtin_m2_type * builtin_m2_type (struct gdbarch *gdbarch) { return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data); } /* Initialization for Modula-2 */ void _initialize_m2_language (void) { m2_type_data = gdbarch_data_register_post_init (build_m2_types); }