/* Support for printing C++ values for GDB, the GNU debugger. Copyright 1986, 1988, 1989, 1991 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "defs.h" #include "obstack.h" #include "symtab.h" #include "gdbtypes.h" #include "expression.h" #include "value.h" #include "command.h" #include "gdbcmd.h" #include "demangle.h" int vtblprint; /* Controls printing of vtbl's */ int objectprint; /* Controls looking up an object's derived type using what we find in its vtables. */ struct obstack dont_print_obstack; static void cplus_print_value PARAMS ((struct type *, char *, FILE *, int, int, enum val_prettyprint, struct type **)); /* BEGIN-FIXME: Hooks into typeprint.c, find a better home for prototypes. */ extern void c_type_print_base PARAMS ((struct type *, FILE *, int, int)); extern void c_type_print_varspec_prefix PARAMS ((struct type *, FILE *, int, int)); extern void cp_type_print_method_args PARAMS ((struct type **, char *, char *, int, FILE *)); extern struct obstack dont_print_obstack; /* END-FIXME */ /* BEGIN-FIXME: Hooks into c-valprint.c */ extern int c_val_print PARAMS ((struct type *, char *, CORE_ADDR, FILE *, int, int, int, enum val_prettyprint)); /* END-FIXME */ void cp_print_class_method (valaddr, type, stream) char *valaddr; struct type *type; FILE *stream; { struct type *domain; struct fn_field *f = NULL; int j = 0; int len2; int offset; char *kind = ""; CORE_ADDR addr; struct symbol *sym; unsigned len; unsigned int i; domain = TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)); addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr); if (METHOD_PTR_IS_VIRTUAL (addr)) { offset = METHOD_PTR_TO_VOFFSET (addr); len = TYPE_NFN_FIELDS (domain); for (i = 0; i < len; i++) { f = TYPE_FN_FIELDLIST1 (domain, i); len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); for (j = 0; j < len2; j++) { QUIT; if (TYPE_FN_FIELD_VOFFSET (f, j) == offset) { kind = "virtual "; goto common; } } } } else { sym = find_pc_function (addr); if (sym == 0) { error ("invalid pointer to member function"); } len = TYPE_NFN_FIELDS (domain); for (i = 0; i < len; i++) { f = TYPE_FN_FIELDLIST1 (domain, i); len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); for (j = 0; j < len2; j++) { QUIT; if (TYPE_FN_FIELD_STUB (f, j)) check_stub_method (domain, i, j); if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j))) { goto common; } } } } common: if (i < len) { fprintf_filtered (stream, "&"); c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f, j), stream, 0, 0); fprintf (stream, kind); if (TYPE_FN_FIELD_PHYSNAME (f, j)[0] == '_' && TYPE_FN_FIELD_PHYSNAME (f, j)[1] == CPLUS_MARKER) { cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j) + 1, "~", TYPE_FN_FIELDLIST_NAME (domain, i), 0, stream); } else { cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j), "", TYPE_FN_FIELDLIST_NAME (domain, i), 0, stream); } } else { fprintf_filtered (stream, "("); type_print (type, "", stream, -1); fprintf_filtered (stream, ") %d", (int) addr >> 3); } } /* Return truth value for assertion that TYPE is of the type "pointer to virtual function". */ int cp_is_vtbl_ptr_type(type) struct type *type; { char *typename = type_name_no_tag (type); static const char vtbl_ptr_name[] = { CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 }; return (typename != NULL && STREQ(typename, vtbl_ptr_name)); } /* Return truth value for the assertion that TYPE is of the type "pointer to virtual function table". */ int cp_is_vtbl_member(type) struct type *type; { if (TYPE_CODE (type) == TYPE_CODE_PTR) type = TYPE_TARGET_TYPE (type); else return 0; if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT) /* Virtual functions tables are full of pointers to virtual functions. */ return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type)); return 0; } /* Mutually recursive subroutines of cplus_print_value and c_val_print to print out a structure's fields: cp_print_value_fields and cplus_print_value. TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the same meanings as in cplus_print_value and c_val_print. DONT_PRINT is an array of baseclass types that we should not print, or zero if called from top level. */ void cp_print_value_fields (type, valaddr, stream, format, recurse, pretty, dont_print) struct type *type; char *valaddr; FILE *stream; int format; int recurse; enum val_prettyprint pretty; struct type **dont_print; { int i, len, n_baseclasses; check_stub_type (type); fprintf_filtered (stream, "{"); len = TYPE_NFIELDS (type); n_baseclasses = TYPE_N_BASECLASSES (type); /* Print out baseclasses such that we don't print duplicates of virtual baseclasses. */ if (n_baseclasses > 0) cplus_print_value (type, valaddr, stream, format, recurse+1, pretty, dont_print); if (!len && n_baseclasses == 1) fprintf_filtered (stream, ""); else { extern int inspect_it; int fields_seen = 0; for (i = n_baseclasses; i < len; i++) { /* Check if static field */ if (TYPE_FIELD_STATIC (type, i)) continue; if (fields_seen) fprintf_filtered (stream, ", "); else if (n_baseclasses > 0) { if (pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 + 2 * recurse, stream); fputs_filtered ("members of ", stream); fputs_filtered (type_name_no_tag (type), stream); fputs_filtered (": ", stream); } } fields_seen = 1; if (pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 + 2 * recurse, stream); } else { wrap_here (n_spaces (2 + 2 * recurse)); } if (inspect_it) { if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR) fputs_filtered ("\"( ptr \"", stream); else fputs_filtered ("\"( nodef \"", stream); fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), language_cplus, DMGL_PARAMS | DMGL_ANSI); fputs_filtered ("\" \"", stream); fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), language_cplus, DMGL_PARAMS | DMGL_ANSI); fputs_filtered ("\") \"", stream); } else { fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), language_cplus, DMGL_PARAMS | DMGL_ANSI); fputs_filtered (" = ", stream); } if (TYPE_FIELD_PACKED (type, i)) { value v; /* Bitfields require special handling, especially due to byte order problems. */ v = value_from_longest (TYPE_FIELD_TYPE (type, i), unpack_field_as_long (type, valaddr, i)); c_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0, stream, format, 0, recurse + 1, pretty); } else { c_val_print (TYPE_FIELD_TYPE (type, i), valaddr + TYPE_FIELD_BITPOS (type, i) / 8, 0, stream, format, 0, recurse + 1, pretty); } } if (pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 * recurse, stream); } } fprintf_filtered (stream, "}"); } /* Special val_print routine to avoid printing multiple copies of virtual baseclasses. */ static void cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print) struct type *type; char *valaddr; FILE *stream; int format; int recurse; enum val_prettyprint pretty; struct type **dont_print; { struct obstack tmp_obstack; struct type **last_dont_print = (struct type **)obstack_next_free (&dont_print_obstack); int i, n_baseclasses = TYPE_N_BASECLASSES (type); if (dont_print == 0) { /* If we're at top level, carve out a completely fresh chunk of the obstack and use that until this particular invocation returns. */ tmp_obstack = dont_print_obstack; /* Bump up the high-water mark. Now alpha is omega. */ obstack_finish (&dont_print_obstack); } for (i = 0; i < n_baseclasses; i++) { char *baddr; int err; char *basename = TYPE_NAME (TYPE_BASECLASS (type, i)); if (BASETYPE_VIA_VIRTUAL (type, i)) { struct type **first_dont_print = (struct type **)obstack_base (&dont_print_obstack); int j = (struct type **)obstack_next_free (&dont_print_obstack) - first_dont_print; while (--j >= 0) if (TYPE_BASECLASS (type, i) == first_dont_print[j]) goto flush_it; obstack_ptr_grow (&dont_print_obstack, TYPE_BASECLASS (type, i)); } /* Fix to use baseclass_offset instead. FIXME */ baddr = baseclass_addr (type, i, valaddr, 0, &err); if (err == 0 && baddr == 0) error ("could not find virtual baseclass %s\n", basename ? basename : ""); if (pretty) { fprintf_filtered (stream, "\n"); print_spaces_filtered (2 * recurse, stream); } fputs_filtered ("<", stream); /* Not sure what the best notation is in the case where there is no baseclass name. */ fputs_filtered (basename ? basename : "", stream); fputs_filtered ("> = ", stream); if (err != 0) fprintf_filtered (stream, "", baddr); else cp_print_value_fields (TYPE_BASECLASS (type, i), baddr, stream, format, recurse, pretty, (struct type **) obstack_base (&dont_print_obstack)); fputs_filtered (", ", stream); flush_it: ; } if (dont_print == 0) { /* Free the space used to deal with the printing of this type from top level. */ obstack_free (&dont_print_obstack, last_dont_print); /* Reset watermark so that we can continue protecting ourselves from whatever we were protecting ourselves. */ dont_print_obstack = tmp_obstack; } } void cp_print_class_member (valaddr, domain, stream, prefix) char *valaddr; struct type *domain; FILE *stream; char *prefix; { /* VAL is a byte offset into the structure type DOMAIN. Find the name of the field for that offset and print it. */ int extra = 0; int bits = 0; register unsigned int i; unsigned len = TYPE_NFIELDS (domain); /* @@ Make VAL into bit offset */ LONGEST val = unpack_long (builtin_type_int, valaddr) << 3; for (i = TYPE_N_BASECLASSES (domain); i < len; i++) { int bitpos = TYPE_FIELD_BITPOS (domain, i); QUIT; if (val == bitpos) break; if (val < bitpos && i != 0) { /* Somehow pointing into a field. */ i -= 1; extra = (val - TYPE_FIELD_BITPOS (domain, i)); if (extra & 0x7) bits = 1; else extra >>= 3; break; } } if (i < len) { char *name; fprintf_filtered (stream, prefix); name = type_name_no_tag (domain); if (name) fputs_filtered (name, stream); else c_type_print_base (domain, stream, 0, 0); fprintf_filtered (stream, "::"); fputs_filtered (TYPE_FIELD_NAME (domain, i), stream); if (extra) fprintf_filtered (stream, " + %d bytes", extra); if (bits) fprintf_filtered (stream, " (offset in bits)"); } else fprintf_filtered (stream, "%d", val >> 3); } void _initialize_cp_valprint () { add_show_from_set (add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint, "Set printing of C++ virtual function tables.", &setprintlist), &showprintlist); add_show_from_set (add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint, "Set printing of object's derived type based on vtable info.", &setprintlist), &showprintlist); /* Give people the defaults which they are used to. */ objectprint = 0; vtblprint = 0; obstack_begin (&dont_print_obstack, 32 * sizeof (struct type *)); }