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 check_stub_type (TYPE_TARGET_TYPE (type
));
82 domain
= TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
));
83 if (domain
== (struct type
*)NULL
)
85 fprintf_filtered (stream
, "<unknown>");
88 addr
= unpack_pointer (lookup_pointer_type (builtin_type_void
), valaddr
);
89 if (METHOD_PTR_IS_VIRTUAL (addr
))
91 offset
= METHOD_PTR_TO_VOFFSET (addr
);
92 len
= TYPE_NFN_FIELDS (domain
);
93 for (i
= 0; i
< len
; i
++)
95 f
= TYPE_FN_FIELDLIST1 (domain
, i
);
96 len2
= TYPE_FN_FIELDLIST_LENGTH (domain
, i
);
98 for (j
= 0; j
< len2
; j
++)
101 if (TYPE_FN_FIELD_VOFFSET (f
, j
) == offset
)
111 sym
= find_pc_function (addr
);
114 error ("invalid pointer to member function");
116 len
= TYPE_NFN_FIELDS (domain
);
117 for (i
= 0; i
< len
; i
++)
119 f
= TYPE_FN_FIELDLIST1 (domain
, i
);
120 len2
= TYPE_FN_FIELDLIST_LENGTH (domain
, i
);
122 for (j
= 0; j
< len2
; j
++)
125 if (TYPE_FN_FIELD_STUB (f
, j
))
126 check_stub_method (domain
, i
, j
);
127 if (STREQ (SYMBOL_NAME (sym
), TYPE_FN_FIELD_PHYSNAME (f
, j
)))
137 fprintf_filtered (stream
, "&");
138 c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f
, j
), stream
, 0, 0);
139 fprintf (stream
, kind
);
140 if (TYPE_FN_FIELD_PHYSNAME (f
, j
)[0] == '_'
141 && TYPE_FN_FIELD_PHYSNAME (f
, j
)[1] == CPLUS_MARKER
)
143 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f
, j
) + 1, "~",
144 TYPE_FN_FIELDLIST_NAME (domain
, i
),
149 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f
, j
), "",
150 TYPE_FN_FIELDLIST_NAME (domain
, i
),
156 fprintf_filtered (stream
, "(");
157 type_print (type
, "", stream
, -1);
158 fprintf_filtered (stream
, ") %d", (int) addr
>> 3);
162 /* Return truth value for assertion that TYPE is of the type
163 "pointer to virtual function". */
166 cp_is_vtbl_ptr_type(type
)
169 char *typename
= type_name_no_tag (type
);
170 /* This was what it was for gcc 2.4.5 and earlier. */
171 static const char vtbl_ptr_name_old
[] =
172 { CPLUS_MARKER
,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
173 /* It was changed to this after 2.4.5. */
174 static const char vtbl_ptr_name
[] =
175 { '_','_','v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
177 return (typename
!= NULL
178 && (STREQ (typename
, vtbl_ptr_name
)
179 || STREQ (typename
, vtbl_ptr_name_old
)));
182 /* Return truth value for the assertion that TYPE is of the type
183 "pointer to virtual function table". */
186 cp_is_vtbl_member(type
)
189 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
190 type
= TYPE_TARGET_TYPE (type
);
194 if (TYPE_CODE (type
) == TYPE_CODE_ARRAY
195 && TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_STRUCT
)
196 /* Virtual functions tables are full of pointers to virtual functions. */
197 return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type
));
201 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
202 print out a structure's fields: cp_print_value_fields and cplus_print_value.
204 TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
205 same meanings as in cplus_print_value and c_val_print.
207 DONT_PRINT is an array of baseclass types that we
208 should not print, or zero if called from top level. */
211 cp_print_value_fields (type
, valaddr
, stream
, format
, recurse
, pretty
,
218 enum val_prettyprint pretty
;
219 struct type
**dont_print
;
221 int i
, len
, n_baseclasses
;
223 check_stub_type (type
);
225 fprintf_filtered (stream
, "{");
226 len
= TYPE_NFIELDS (type
);
227 n_baseclasses
= TYPE_N_BASECLASSES (type
);
229 /* Print out baseclasses such that we don't print
230 duplicates of virtual baseclasses. */
231 if (n_baseclasses
> 0)
232 cplus_print_value (type
, valaddr
, stream
, format
, recurse
+1, pretty
,
235 if (!len
&& n_baseclasses
== 1)
236 fprintf_filtered (stream
, "<No data fields>");
239 extern int inspect_it
;
242 for (i
= n_baseclasses
; i
< len
; i
++)
244 /* Check if static field */
245 if (TYPE_FIELD_STATIC (type
, i
))
248 fprintf_filtered (stream
, ", ");
249 else if (n_baseclasses
> 0)
253 fprintf_filtered (stream
, "\n");
254 print_spaces_filtered (2 + 2 * recurse
, stream
);
255 fputs_filtered ("members of ", stream
);
256 fputs_filtered (type_name_no_tag (type
), stream
);
257 fputs_filtered (": ", stream
);
264 fprintf_filtered (stream
, "\n");
265 print_spaces_filtered (2 + 2 * recurse
, stream
);
269 wrap_here (n_spaces (2 + 2 * recurse
));
273 if (TYPE_CODE (TYPE_FIELD_TYPE (type
, i
)) == TYPE_CODE_PTR
)
274 fputs_filtered ("\"( ptr \"", stream
);
276 fputs_filtered ("\"( nodef \"", stream
);
277 fprintf_symbol_filtered (stream
, TYPE_FIELD_NAME (type
, i
),
279 DMGL_PARAMS
| DMGL_ANSI
);
280 fputs_filtered ("\" \"", stream
);
281 fprintf_symbol_filtered (stream
, TYPE_FIELD_NAME (type
, i
),
283 DMGL_PARAMS
| DMGL_ANSI
);
284 fputs_filtered ("\") \"", stream
);
288 fprintf_symbol_filtered (stream
, TYPE_FIELD_NAME (type
, i
),
290 DMGL_PARAMS
| DMGL_ANSI
);
291 fputs_filtered (" = ", stream
);
293 if (TYPE_FIELD_PACKED (type
, i
))
297 /* Bitfields require special handling, especially due to byte
299 v
= value_from_longest (TYPE_FIELD_TYPE (type
, i
),
300 unpack_field_as_long (type
, valaddr
, i
));
302 c_val_print (TYPE_FIELD_TYPE (type
, i
), VALUE_CONTENTS (v
), 0,
303 stream
, format
, 0, recurse
+ 1, pretty
);
307 c_val_print (TYPE_FIELD_TYPE (type
, i
),
308 valaddr
+ TYPE_FIELD_BITPOS (type
, i
) / 8,
309 0, stream
, format
, 0, recurse
+ 1, pretty
);
314 fprintf_filtered (stream
, "\n");
315 print_spaces_filtered (2 * recurse
, stream
);
318 fprintf_filtered (stream
, "}");
321 /* Special val_print routine to avoid printing multiple copies of virtual
325 cplus_print_value (type
, valaddr
, stream
, format
, recurse
, pretty
, dont_print
)
331 enum val_prettyprint pretty
;
332 struct type
**dont_print
;
334 struct obstack tmp_obstack
;
335 struct type
**last_dont_print
336 = (struct type
**)obstack_next_free (&dont_print_obstack
);
337 int i
, n_baseclasses
= TYPE_N_BASECLASSES (type
);
341 /* If we're at top level, carve out a completely fresh
342 chunk of the obstack and use that until this particular
343 invocation returns. */
344 tmp_obstack
= dont_print_obstack
;
345 /* Bump up the high-water mark. Now alpha is omega. */
346 obstack_finish (&dont_print_obstack
);
349 for (i
= 0; i
< n_baseclasses
; i
++)
353 char *basename
= TYPE_NAME (TYPE_BASECLASS (type
, i
));
355 if (BASETYPE_VIA_VIRTUAL (type
, i
))
357 struct type
**first_dont_print
358 = (struct type
**)obstack_base (&dont_print_obstack
);
360 int j
= (struct type
**)obstack_next_free (&dont_print_obstack
)
364 if (TYPE_BASECLASS (type
, i
) == first_dont_print
[j
])
367 obstack_ptr_grow (&dont_print_obstack
, TYPE_BASECLASS (type
, i
));
370 /* Fix to use baseclass_offset instead. FIXME */
371 baddr
= baseclass_addr (type
, i
, valaddr
, 0, &err
);
372 if (err
== 0 && baddr
== 0)
373 error ("could not find virtual baseclass %s\n",
374 basename
? basename
: "");
378 fprintf_filtered (stream
, "\n");
379 print_spaces_filtered (2 * recurse
, stream
);
381 fputs_filtered ("<", stream
);
382 /* Not sure what the best notation is in the case where there is no
384 fputs_filtered (basename
? basename
: "", stream
);
385 fputs_filtered ("> = ", stream
);
387 fprintf_filtered (stream
,
388 "<invalid address 0x%lx>", (unsigned long) baddr
);
390 cp_print_value_fields (TYPE_BASECLASS (type
, i
), baddr
, stream
, format
,
392 (struct type
**) obstack_base (&dont_print_obstack
));
393 fputs_filtered (", ", stream
);
401 /* Free the space used to deal with the printing
402 of this type from top level. */
403 obstack_free (&dont_print_obstack
, last_dont_print
);
404 /* Reset watermark so that we can continue protecting
405 ourselves from whatever we were protecting ourselves. */
406 dont_print_obstack
= tmp_obstack
;
411 cp_print_class_member (valaddr
, domain
, stream
, prefix
)
418 /* VAL is a byte offset into the structure type DOMAIN.
419 Find the name of the field for that offset and
423 register unsigned int i
;
424 unsigned len
= TYPE_NFIELDS (domain
);
425 /* @@ Make VAL into bit offset */
426 LONGEST val
= unpack_long (builtin_type_int
, valaddr
) << 3;
427 for (i
= TYPE_N_BASECLASSES (domain
); i
< len
; i
++)
429 int bitpos
= TYPE_FIELD_BITPOS (domain
, i
);
433 if (val
< bitpos
&& i
!= 0)
435 /* Somehow pointing into a field. */
437 extra
= (val
- TYPE_FIELD_BITPOS (domain
, i
));
448 fprintf_filtered (stream
, prefix
);
449 name
= type_name_no_tag (domain
);
451 fputs_filtered (name
, stream
);
453 c_type_print_base (domain
, stream
, 0, 0);
454 fprintf_filtered (stream
, "::");
455 fputs_filtered (TYPE_FIELD_NAME (domain
, i
), stream
);
457 fprintf_filtered (stream
, " + %d bytes", extra
);
459 fprintf_filtered (stream
, " (offset in bits)");
462 fprintf_filtered (stream
, "%d", val
>> 3);
466 _initialize_cp_valprint ()
469 (add_set_cmd ("vtbl", class_support
, var_boolean
, (char *)&vtblprint
,
470 "Set printing of C++ virtual function tables.",
475 (add_set_cmd ("object", class_support
, var_boolean
, (char *)&objectprint
,
476 "Set printing of object's derived type based on vtable info.",
480 /* Give people the defaults which they are used to. */
483 obstack_begin (&dont_print_obstack
, 32 * sizeof (struct type
*));