1 /* Support for printing C++ values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include "expression.h"
30 int vtblprint; /* Controls printing of vtbl's */
31 int objectprint; /* Controls looking up an object's derived type
32 using what we find in its vtables. */
33 struct obstack dont_print_obstack;
36 cplus_print_value PARAMS ((struct type *, char *, FILE *, int, int,
37 enum val_prettyprint, struct type **));
39 /* BEGIN-FIXME: Hooks into typeprint.c, find a better home for prototypes. */
42 c_type_print_base PARAMS ((struct type *, FILE *, int, int));
45 c_type_print_varspec_prefix PARAMS ((struct type *, FILE *, int, int));
48 cp_type_print_method_args PARAMS ((struct type **, char *, char *, int,
51 extern struct obstack dont_print_obstack;
56 /* BEGIN-FIXME: Hooks into c-valprint.c */
59 c_val_print PARAMS ((struct type *, char *, CORE_ADDR, FILE *, int, int, int,
60 enum val_prettyprint));
65 cp_print_class_method (valaddr, type, stream)
71 struct fn_field *f = NULL;
81 domain = TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type));
82 addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr);
83 if (METHOD_PTR_IS_VIRTUAL (addr))
85 offset = METHOD_PTR_TO_VOFFSET (addr);
86 len = TYPE_NFN_FIELDS (domain);
87 for (i = 0; i < len; i++)
89 f = TYPE_FN_FIELDLIST1 (domain, i);
90 len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
92 for (j = 0; j < len2; j++)
95 if (TYPE_FN_FIELD_VOFFSET (f, j) == offset)
105 sym = find_pc_function (addr);
108 error ("invalid pointer to member function");
110 len = TYPE_NFN_FIELDS (domain);
111 for (i = 0; i < len; i++)
113 f = TYPE_FN_FIELDLIST1 (domain, i);
114 len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
116 for (j = 0; j < len2; j++)
119 if (TYPE_FN_FIELD_STUB (f, j))
120 check_stub_method (domain, i, j);
121 if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j)))
131 fprintf_filtered (stream, "&");
132 c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f, j), stream, 0, 0);
133 fprintf (stream, kind);
134 if (TYPE_FN_FIELD_PHYSNAME (f, j)[0] == '_'
135 && TYPE_FN_FIELD_PHYSNAME (f, j)[1] == CPLUS_MARKER)
137 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j) + 1, "~",
138 TYPE_FN_FIELDLIST_NAME (domain, i),
143 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j), "",
144 TYPE_FN_FIELDLIST_NAME (domain, i),
150 fprintf_filtered (stream, "(");
151 type_print (type, "", stream, -1);
152 fprintf_filtered (stream, ") %d", (int) addr >> 3);
156 /* Return truth value for assertion that TYPE is of the type
157 "pointer to virtual function". */
160 cp_is_vtbl_ptr_type(type)
163 char *typename = type_name_no_tag (type);
164 static const char vtbl_ptr_name[] =
165 { CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
167 return (typename != NULL && STREQ(typename, vtbl_ptr_name));
170 /* Return truth value for the assertion that TYPE is of the type
171 "pointer to virtual function table". */
174 cp_is_vtbl_member(type)
177 if (TYPE_CODE (type) == TYPE_CODE_PTR)
178 type = TYPE_TARGET_TYPE (type);
182 if (TYPE_CODE (type) == TYPE_CODE_ARRAY
183 && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT)
184 /* Virtual functions tables are full of pointers to virtual functions. */
185 return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type));
189 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
190 print out a structure's fields: cp_print_value_fields and cplus_print_value.
192 TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
193 same meanings as in cplus_print_value and c_val_print.
195 DONT_PRINT is an array of baseclass types that we
196 should not print, or zero if called from top level. */
199 cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
206 enum val_prettyprint pretty;
207 struct type **dont_print;
209 int i, len, n_baseclasses;
211 check_stub_type (type);
213 fprintf_filtered (stream, "{");
214 len = TYPE_NFIELDS (type);
215 n_baseclasses = TYPE_N_BASECLASSES (type);
217 /* Print out baseclasses such that we don't print
218 duplicates of virtual baseclasses. */
219 if (n_baseclasses > 0)
220 cplus_print_value (type, valaddr, stream, format, recurse+1, pretty,
223 if (!len && n_baseclasses == 1)
224 fprintf_filtered (stream, "<No data fields>");
227 extern int inspect_it;
230 for (i = n_baseclasses; i < len; i++)
232 /* Check if static field */
233 if (TYPE_FIELD_STATIC (type, i))
236 fprintf_filtered (stream, ", ");
237 else if (n_baseclasses > 0)
241 fprintf_filtered (stream, "\n");
242 print_spaces_filtered (2 + 2 * recurse, stream);
243 fputs_filtered ("members of ", stream);
244 fputs_filtered (type_name_no_tag (type), stream);
245 fputs_filtered (": ", stream);
252 fprintf_filtered (stream, "\n");
253 print_spaces_filtered (2 + 2 * recurse, stream);
257 wrap_here (n_spaces (2 + 2 * recurse));
261 if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
262 fputs_filtered ("\"( ptr \"", stream);
264 fputs_filtered ("\"( nodef \"", stream);
265 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
267 DMGL_PARAMS | DMGL_ANSI);
268 fputs_filtered ("\" \"", stream);
269 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
271 DMGL_PARAMS | DMGL_ANSI);
272 fputs_filtered ("\") \"", stream);
276 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
278 DMGL_PARAMS | DMGL_ANSI);
279 fputs_filtered (" = ", stream);
281 if (TYPE_FIELD_PACKED (type, i))
285 /* Bitfields require special handling, especially due to byte
287 v = value_from_longest (TYPE_FIELD_TYPE (type, i),
288 unpack_field_as_long (type, valaddr, i));
290 c_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
291 stream, format, 0, recurse + 1, pretty);
295 c_val_print (TYPE_FIELD_TYPE (type, i),
296 valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
297 0, stream, format, 0, recurse + 1, pretty);
302 fprintf_filtered (stream, "\n");
303 print_spaces_filtered (2 * recurse, stream);
306 fprintf_filtered (stream, "}");
309 /* Special val_print routine to avoid printing multiple copies of virtual
313 cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print)
319 enum val_prettyprint pretty;
320 struct type **dont_print;
322 struct obstack tmp_obstack;
323 struct type **last_dont_print
324 = (struct type **)obstack_next_free (&dont_print_obstack);
325 int i, n_baseclasses = TYPE_N_BASECLASSES (type);
329 /* If we're at top level, carve out a completely fresh
330 chunk of the obstack and use that until this particular
331 invocation returns. */
332 tmp_obstack = dont_print_obstack;
333 /* Bump up the high-water mark. Now alpha is omega. */
334 obstack_finish (&dont_print_obstack);
337 for (i = 0; i < n_baseclasses; i++)
341 char *basename = TYPE_NAME (TYPE_BASECLASS (type, i));
343 if (BASETYPE_VIA_VIRTUAL (type, i))
345 struct type **first_dont_print
346 = (struct type **)obstack_base (&dont_print_obstack);
348 int j = (struct type **)obstack_next_free (&dont_print_obstack)
352 if (TYPE_BASECLASS (type, i) == first_dont_print[j])
355 obstack_ptr_grow (&dont_print_obstack, TYPE_BASECLASS (type, i));
358 /* Fix to use baseclass_offset instead. FIXME */
359 baddr = baseclass_addr (type, i, valaddr, 0, &err);
360 if (err == 0 && baddr == 0)
361 error ("could not find virtual baseclass %s\n",
362 basename ? basename : "");
366 fprintf_filtered (stream, "\n");
367 print_spaces_filtered (2 * recurse, stream);
369 fputs_filtered ("<", stream);
370 /* Not sure what the best notation is in the case where there is no
372 fputs_filtered (basename ? basename : "", stream);
373 fputs_filtered ("> = ", stream);
375 fprintf_filtered (stream, "<invalid address 0x%x>", baddr);
377 cp_print_value_fields (TYPE_BASECLASS (type, i), baddr, stream, format,
379 (struct type **) obstack_base (&dont_print_obstack));
380 fputs_filtered (", ", stream);
388 /* Free the space used to deal with the printing
389 of this type from top level. */
390 obstack_free (&dont_print_obstack, last_dont_print);
391 /* Reset watermark so that we can continue protecting
392 ourselves from whatever we were protecting ourselves. */
393 dont_print_obstack = tmp_obstack;
398 cp_print_class_member (valaddr, domain, stream, prefix)
405 /* VAL is a byte offset into the structure type DOMAIN.
406 Find the name of the field for that offset and
410 register unsigned int i;
411 unsigned len = TYPE_NFIELDS (domain);
412 /* @@ Make VAL into bit offset */
413 LONGEST val = unpack_long (builtin_type_int, valaddr) << 3;
414 for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
416 int bitpos = TYPE_FIELD_BITPOS (domain, i);
420 if (val < bitpos && i != 0)
422 /* Somehow pointing into a field. */
424 extra = (val - TYPE_FIELD_BITPOS (domain, i));
435 fprintf_filtered (stream, prefix);
436 name = type_name_no_tag (domain);
438 fputs_filtered (name, stream);
440 c_type_print_base (domain, stream, 0, 0);
441 fprintf_filtered (stream, "::");
442 fputs_filtered (TYPE_FIELD_NAME (domain, i), stream);
444 fprintf_filtered (stream, " + %d bytes", extra);
446 fprintf_filtered (stream, " (offset in bits)");
449 fprintf_filtered (stream, "%d", val >> 3);
453 _initialize_cp_valprint ()
456 (add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint,
457 "Set printing of C++ virtual function tables.",
462 (add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint,
463 "Set printing of object's derived type based on vtable info.",
467 /* Give people the defaults which they are used to. */
470 obstack_begin (&dont_print_obstack, 32 * sizeof (struct type *));