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
)
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 (STREQ (SYMBOL_NAME (sym
), TYPE_FN_FIELD_PHYSNAME (f
, j
)))
129 fprintf_filtered (stream
, "&");
130 c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f
, j
), stream
, 0, 0);
131 fprintf (stream
, kind
);
132 if (TYPE_FN_FIELD_PHYSNAME (f
, j
)[0] == '_'
133 && TYPE_FN_FIELD_PHYSNAME (f
, j
)[1] == CPLUS_MARKER
)
135 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f
, j
) + 1, "~",
136 TYPE_FN_FIELDLIST_NAME (domain
, i
),
141 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f
, j
), "",
142 TYPE_FN_FIELDLIST_NAME (domain
, i
),
148 fprintf_filtered (stream
, "(");
149 type_print (type
, "", stream
, -1);
150 fprintf_filtered (stream
, ") %d", (int) addr
>> 3);
154 /* Return truth value for assertion that TYPE is of the type
155 "pointer to virtual function". */
158 cp_is_vtbl_ptr_type(type
)
161 char *typename
= type_name_no_tag (type
);
162 static const char vtbl_ptr_name
[] =
163 { CPLUS_MARKER
,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
165 return (typename
!= NULL
&& STREQ(typename
, vtbl_ptr_name
));
168 /* Return truth value for the assertion that TYPE is of the type
169 "pointer to virtual function table". */
172 cp_is_vtbl_member(type
)
175 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
176 type
= TYPE_TARGET_TYPE (type
);
180 if (TYPE_CODE (type
) == TYPE_CODE_ARRAY
181 && TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_STRUCT
)
182 /* Virtual functions tables are full of pointers to virtual functions. */
183 return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type
));
187 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
188 print out a structure's fields: cp_print_value_fields and cplus_print_value.
190 TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
191 same meanings as in cplus_print_value and c_val_print.
193 DONT_PRINT is an array of baseclass types that we
194 should not print, or zero if called from top level. */
197 cp_print_value_fields (type
, valaddr
, stream
, format
, recurse
, pretty
,
204 enum val_prettyprint pretty
;
205 struct type
**dont_print
;
207 int i
, len
, n_baseclasses
;
209 check_stub_type (type
);
211 fprintf_filtered (stream
, "{");
212 len
= TYPE_NFIELDS (type
);
213 n_baseclasses
= TYPE_N_BASECLASSES (type
);
215 /* Print out baseclasses such that we don't print
216 duplicates of virtual baseclasses. */
217 if (n_baseclasses
> 0)
218 cplus_print_value (type
, valaddr
, stream
, format
, recurse
+1, pretty
,
221 if (!len
&& n_baseclasses
== 1)
222 fprintf_filtered (stream
, "<No data fields>");
225 extern int inspect_it
;
228 for (i
= n_baseclasses
; i
< len
; i
++)
230 /* Check if static field */
231 if (TYPE_FIELD_STATIC (type
, i
))
234 fprintf_filtered (stream
, ", ");
235 else if (n_baseclasses
> 0)
239 fprintf_filtered (stream
, "\n");
240 print_spaces_filtered (2 + 2 * recurse
, stream
);
241 fputs_filtered ("members of ", stream
);
242 fputs_filtered (type_name_no_tag (type
), stream
);
243 fputs_filtered (": ", stream
);
250 fprintf_filtered (stream
, "\n");
251 print_spaces_filtered (2 + 2 * recurse
, stream
);
255 wrap_here (n_spaces (2 + 2 * recurse
));
259 if (TYPE_CODE (TYPE_FIELD_TYPE (type
, i
)) == TYPE_CODE_PTR
)
260 fputs_filtered ("\"( ptr \"", stream
);
262 fputs_filtered ("\"( nodef \"", stream
);
263 fprintf_symbol_filtered (stream
, TYPE_FIELD_NAME (type
, i
),
265 DMGL_PARAMS
| DMGL_ANSI
);
266 fputs_filtered ("\" \"", stream
);
267 fprintf_symbol_filtered (stream
, TYPE_FIELD_NAME (type
, i
),
269 DMGL_PARAMS
| DMGL_ANSI
);
270 fputs_filtered ("\") \"", stream
);
274 fprintf_symbol_filtered (stream
, TYPE_FIELD_NAME (type
, i
),
276 DMGL_PARAMS
| DMGL_ANSI
);
277 fputs_filtered (" = ", stream
);
279 if (TYPE_FIELD_PACKED (type
, i
))
283 /* Bitfields require special handling, especially due to byte
285 v
= value_from_longest (TYPE_FIELD_TYPE (type
, i
),
286 unpack_field_as_long (type
, valaddr
, i
));
288 c_val_print (TYPE_FIELD_TYPE (type
, i
), VALUE_CONTENTS (v
), 0,
289 stream
, format
, 0, recurse
+ 1, pretty
);
293 c_val_print (TYPE_FIELD_TYPE (type
, i
),
294 valaddr
+ TYPE_FIELD_BITPOS (type
, i
) / 8,
295 0, stream
, format
, 0, recurse
+ 1, pretty
);
300 fprintf_filtered (stream
, "\n");
301 print_spaces_filtered (2 * recurse
, stream
);
304 fprintf_filtered (stream
, "}");
307 /* Special val_print routine to avoid printing multiple copies of virtual
311 cplus_print_value (type
, valaddr
, stream
, format
, recurse
, pretty
, dont_print
)
317 enum val_prettyprint pretty
;
318 struct type
**dont_print
;
320 struct obstack tmp_obstack
;
321 struct type
**last_dont_print
322 = (struct type
**)obstack_next_free (&dont_print_obstack
);
323 int i
, n_baseclasses
= TYPE_N_BASECLASSES (type
);
327 /* If we're at top level, carve out a completely fresh
328 chunk of the obstack and use that until this particular
329 invocation returns. */
330 tmp_obstack
= dont_print_obstack
;
331 /* Bump up the high-water mark. Now alpha is omega. */
332 obstack_finish (&dont_print_obstack
);
335 for (i
= 0; i
< n_baseclasses
; i
++)
340 if (BASETYPE_VIA_VIRTUAL (type
, i
))
342 struct type
**first_dont_print
343 = (struct type
**)obstack_base (&dont_print_obstack
);
345 int j
= (struct type
**)obstack_next_free (&dont_print_obstack
)
349 if (TYPE_BASECLASS (type
, i
) == first_dont_print
[j
])
352 obstack_ptr_grow (&dont_print_obstack
, TYPE_BASECLASS (type
, i
));
355 /* Fix to use baseclass_offset instead. FIXME */
356 baddr
= baseclass_addr (type
, i
, valaddr
, 0, &err
);
357 if (err
== 0 && baddr
== 0)
358 error ("could not find virtual baseclass `%s'\n",
359 type_name_no_tag (TYPE_BASECLASS (type
, i
)));
363 fprintf_filtered (stream
, "\n");
364 print_spaces_filtered (2 * recurse
, stream
);
366 fputs_filtered ("<", stream
);
367 fputs_filtered (type_name_no_tag (TYPE_BASECLASS (type
, i
)), stream
);
368 fputs_filtered ("> = ", stream
);
370 fprintf_filtered (stream
, "<invalid address 0x%x>", baddr
);
372 cp_print_value_fields (TYPE_BASECLASS (type
, i
), baddr
, stream
, format
,
374 (struct type
**) obstack_base (&dont_print_obstack
));
375 fputs_filtered (", ", stream
);
383 /* Free the space used to deal with the printing
384 of this type from top level. */
385 obstack_free (&dont_print_obstack
, last_dont_print
);
386 /* Reset watermark so that we can continue protecting
387 ourselves from whatever we were protecting ourselves. */
388 dont_print_obstack
= tmp_obstack
;
393 cp_print_class_member (valaddr
, domain
, stream
, prefix
)
400 /* VAL is a byte offset into the structure type DOMAIN.
401 Find the name of the field for that offset and
405 register unsigned int i
;
406 unsigned len
= TYPE_NFIELDS (domain
);
407 /* @@ Make VAL into bit offset */
408 LONGEST val
= unpack_long (builtin_type_int
, valaddr
) << 3;
409 for (i
= TYPE_N_BASECLASSES (domain
); i
< len
; i
++)
411 int bitpos
= TYPE_FIELD_BITPOS (domain
, i
);
415 if (val
< bitpos
&& i
!= 0)
417 /* Somehow pointing into a field. */
419 extra
= (val
- TYPE_FIELD_BITPOS (domain
, i
));
430 fprintf_filtered (stream
, prefix
);
431 name
= type_name_no_tag (domain
);
433 fputs_filtered (name
, stream
);
435 c_type_print_base (domain
, stream
, 0, 0);
436 fprintf_filtered (stream
, "::");
437 fputs_filtered (TYPE_FIELD_NAME (domain
, i
), stream
);
439 fprintf_filtered (stream
, " + %d bytes", extra
);
441 fprintf_filtered (stream
, " (offset in bits)");
444 fprintf_filtered (stream
, "%d", val
>> 3);
448 _initialize_cp_valprint ()
451 (add_set_cmd ("vtbl", class_support
, var_boolean
, (char *)&vtblprint
,
452 "Set printing of C++ virtual function tables.",
457 (add_set_cmd ("object", class_support
, var_boolean
, (char *)&objectprint
,
458 "Set printing of object's derived type based on vtable info.",
462 /* Give people the defaults which they are used to. */
465 obstack_begin (&dont_print_obstack
, 32 * sizeof (struct type
*));