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"
29 int vtblprint
; /* Controls printing of vtbl's */
30 int objectprint
; /* Controls looking up an object's derived type
31 using what we find in its vtables. */
32 struct obstack dont_print_obstack
;
35 cplus_print_value
PARAMS ((struct type
*, char *, FILE *, int, int,
36 enum val_prettyprint
, struct type
**));
38 /* BEGIN-FIXME: Hooks into typeprint.c, find a better home for prototypes. */
41 c_type_print_base
PARAMS ((struct type
*, FILE *, int, int));
44 c_type_print_varspec_prefix
PARAMS ((struct type
*, FILE *, int, int));
47 cp_type_print_method_args
PARAMS ((struct type
**, char *, char *, int,
50 extern struct obstack dont_print_obstack
;
55 /* BEGIN-FIXME: Hooks into c-valprint.c */
58 c_val_print
PARAMS ((struct type
*, char *, CORE_ADDR
, FILE *, int, int, int,
59 enum val_prettyprint
));
64 cp_print_class_method (valaddr
, type
, stream
)
80 domain
= TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
));
81 addr
= unpack_pointer (lookup_pointer_type (builtin_type_void
), valaddr
);
82 if (METHOD_PTR_IS_VIRTUAL (addr
))
84 offset
= METHOD_PTR_TO_VOFFSET (addr
);
85 len
= TYPE_NFN_FIELDS (domain
);
86 for (i
= 0; i
< len
; i
++)
88 f
= TYPE_FN_FIELDLIST1 (domain
, i
);
89 len2
= TYPE_FN_FIELDLIST_LENGTH (domain
, i
);
91 for (j
= 0; j
< len2
; j
++)
94 if (TYPE_FN_FIELD_VOFFSET (f
, j
) == offset
)
104 sym
= find_pc_function (addr
);
107 error ("invalid pointer to member function");
109 len
= TYPE_NFN_FIELDS (domain
);
110 for (i
= 0; i
< len
; i
++)
112 f
= TYPE_FN_FIELDLIST1 (domain
, i
);
113 len2
= TYPE_FN_FIELDLIST_LENGTH (domain
, i
);
115 for (j
= 0; j
< len2
; j
++)
118 if (STREQ (SYMBOL_NAME (sym
), TYPE_FN_FIELD_PHYSNAME (f
, j
)))
128 fprintf_filtered (stream
, "&");
129 c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f
, j
), stream
, 0, 0);
130 fprintf (stream
, kind
);
131 if (TYPE_FN_FIELD_PHYSNAME (f
, j
)[0] == '_'
132 && TYPE_FN_FIELD_PHYSNAME (f
, j
)[1] == CPLUS_MARKER
)
134 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f
, j
) + 1, "~",
135 TYPE_FN_FIELDLIST_NAME (domain
, i
),
140 cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f
, j
), "",
141 TYPE_FN_FIELDLIST_NAME (domain
, i
),
147 fprintf_filtered (stream
, "(");
148 type_print (type
, "", stream
, -1);
149 fprintf_filtered (stream
, ") %d", (int) addr
>> 3);
153 /* Return truth value for assertion that TYPE is of the type
154 "pointer to virtual function". */
157 cp_is_vtbl_ptr_type(type
)
160 char *typename
= type_name_no_tag (type
);
161 static const char vtbl_ptr_name
[] =
162 { CPLUS_MARKER
,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
164 return (typename
!= NULL
&& STREQ(typename
, vtbl_ptr_name
));
167 /* Return truth value for the assertion that TYPE is of the type
168 "pointer to virtual function table". */
171 cp_is_vtbl_member(type
)
174 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
175 type
= TYPE_TARGET_TYPE (type
);
179 if (TYPE_CODE (type
) == TYPE_CODE_ARRAY
180 && TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_STRUCT
)
181 /* Virtual functions tables are full of pointers to virtual functions. */
182 return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type
));
186 /* Mutually recursive subroutines of cplus_print_value and c_val_print to
187 print out a structure's fields: cp_print_value_fields and cplus_print_value.
189 TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
190 same meanings as in cplus_print_value and c_val_print.
192 DONT_PRINT is an array of baseclass types that we
193 should not print, or zero if called from top level. */
196 cp_print_value_fields (type
, valaddr
, stream
, format
, recurse
, pretty
,
203 enum val_prettyprint pretty
;
204 struct type
**dont_print
;
206 int i
, len
, n_baseclasses
;
208 check_stub_type (type
);
210 fprintf_filtered (stream
, "{");
211 len
= TYPE_NFIELDS (type
);
212 n_baseclasses
= TYPE_N_BASECLASSES (type
);
214 /* Print out baseclasses such that we don't print
215 duplicates of virtual baseclasses. */
216 if (n_baseclasses
> 0)
217 cplus_print_value (type
, valaddr
, stream
, format
, recurse
+1, pretty
,
220 if (!len
&& n_baseclasses
== 1)
221 fprintf_filtered (stream
, "<No data fields>");
224 extern int inspect_it
;
227 for (i
= n_baseclasses
; i
< len
; i
++)
229 /* Check if static field */
230 if (TYPE_FIELD_STATIC (type
, i
))
233 fprintf_filtered (stream
, ", ");
234 else if (n_baseclasses
> 0)
238 fprintf_filtered (stream
, "\n");
239 print_spaces_filtered (2 + 2 * recurse
, stream
);
240 fputs_filtered ("members of ", stream
);
241 fputs_filtered (type_name_no_tag (type
), stream
);
242 fputs_filtered (": ", stream
);
249 fprintf_filtered (stream
, "\n");
250 print_spaces_filtered (2 + 2 * recurse
, stream
);
254 wrap_here (n_spaces (2 + 2 * recurse
));
258 if (TYPE_CODE (TYPE_FIELD_TYPE (type
, i
)) == TYPE_CODE_PTR
)
259 fputs_filtered ("\"( ptr \"", stream
);
261 fputs_filtered ("\"( nodef \"", stream
);
262 fprint_symbol (stream
, TYPE_FIELD_NAME (type
, i
));
263 fputs_filtered ("\" \"", stream
);
264 fprint_symbol (stream
, TYPE_FIELD_NAME (type
, i
));
265 fputs_filtered ("\") \"", stream
);
269 fprint_symbol (stream
, TYPE_FIELD_NAME (type
, i
));
270 fputs_filtered (" = ", stream
);
272 if (TYPE_FIELD_PACKED (type
, i
))
276 /* Bitfields require special handling, especially due to byte
278 v
= value_from_longest (TYPE_FIELD_TYPE (type
, i
),
279 unpack_field_as_long (type
, valaddr
, i
));
281 c_val_print (TYPE_FIELD_TYPE (type
, i
), VALUE_CONTENTS (v
), 0,
282 stream
, format
, 0, recurse
+ 1, pretty
);
286 c_val_print (TYPE_FIELD_TYPE (type
, i
),
287 valaddr
+ TYPE_FIELD_BITPOS (type
, i
) / 8,
288 0, stream
, format
, 0, recurse
+ 1, pretty
);
293 fprintf_filtered (stream
, "\n");
294 print_spaces_filtered (2 * recurse
, stream
);
297 fprintf_filtered (stream
, "}");
300 /* Special val_print routine to avoid printing multiple copies of virtual
304 cplus_print_value (type
, valaddr
, stream
, format
, recurse
, pretty
, dont_print
)
310 enum val_prettyprint pretty
;
311 struct type
**dont_print
;
313 struct obstack tmp_obstack
;
314 struct type
**last_dont_print
315 = (struct type
**)obstack_next_free (&dont_print_obstack
);
316 int i
, n_baseclasses
= TYPE_N_BASECLASSES (type
);
320 /* If we're at top level, carve out a completely fresh
321 chunk of the obstack and use that until this particular
322 invocation returns. */
323 tmp_obstack
= dont_print_obstack
;
324 /* Bump up the high-water mark. Now alpha is omega. */
325 obstack_finish (&dont_print_obstack
);
328 for (i
= 0; i
< n_baseclasses
; i
++)
333 if (BASETYPE_VIA_VIRTUAL (type
, i
))
335 struct type
**first_dont_print
336 = (struct type
**)obstack_base (&dont_print_obstack
);
338 int j
= (struct type
**)obstack_next_free (&dont_print_obstack
)
342 if (TYPE_BASECLASS (type
, i
) == first_dont_print
[j
])
345 obstack_ptr_grow (&dont_print_obstack
, TYPE_BASECLASS (type
, i
));
348 /* Fix to use baseclass_offset instead. FIXME */
349 baddr
= baseclass_addr (type
, i
, valaddr
, 0, &err
);
350 if (err
== 0 && baddr
== 0)
351 error ("could not find virtual baseclass `%s'\n",
352 type_name_no_tag (TYPE_BASECLASS (type
, i
)));
356 fprintf_filtered (stream
, "\n");
357 print_spaces_filtered (2 * recurse
, stream
);
359 fputs_filtered ("<", stream
);
360 fputs_filtered (type_name_no_tag (TYPE_BASECLASS (type
, i
)), stream
);
361 fputs_filtered ("> = ", stream
);
363 fprintf_filtered (stream
, "<invalid address 0x%x>", baddr
);
365 cp_print_value_fields (TYPE_BASECLASS (type
, i
), baddr
, stream
, format
,
367 (struct type
**) obstack_base (&dont_print_obstack
));
368 fputs_filtered (", ", stream
);
376 /* Free the space used to deal with the printing
377 of this type from top level. */
378 obstack_free (&dont_print_obstack
, last_dont_print
);
379 /* Reset watermark so that we can continue protecting
380 ourselves from whatever we were protecting ourselves. */
381 dont_print_obstack
= tmp_obstack
;
386 cp_print_class_member (valaddr
, domain
, stream
, prefix
)
393 /* VAL is a byte offset into the structure type DOMAIN.
394 Find the name of the field for that offset and
398 register unsigned int i
;
399 unsigned len
= TYPE_NFIELDS (domain
);
400 /* @@ Make VAL into bit offset */
401 LONGEST val
= unpack_long (builtin_type_int
, valaddr
) << 3;
402 for (i
= TYPE_N_BASECLASSES (domain
); i
< len
; i
++)
404 int bitpos
= TYPE_FIELD_BITPOS (domain
, i
);
408 if (val
< bitpos
&& i
!= 0)
410 /* Somehow pointing into a field. */
412 extra
= (val
- TYPE_FIELD_BITPOS (domain
, i
));
423 fprintf_filtered (stream
, prefix
);
424 name
= type_name_no_tag (domain
);
426 fputs_filtered (name
, stream
);
428 c_type_print_base (domain
, stream
, 0, 0);
429 fprintf_filtered (stream
, "::");
430 fputs_filtered (TYPE_FIELD_NAME (domain
, i
), stream
);
432 fprintf_filtered (stream
, " + %d bytes", extra
);
434 fprintf_filtered (stream
, " (offset in bits)");
437 fprintf_filtered (stream
, "%d", val
>> 3);
441 _initialize_cp_valprint ()
444 (add_set_cmd ("vtbl", class_support
, var_boolean
, (char *)&vtblprint
,
445 "Set printing of C++ virtual function tables.",
450 (add_set_cmd ("object", class_support
, var_boolean
, (char *)&objectprint
,
451 "Set printing of object's derived type based on vtable info.",
455 /* Give people the defaults which they are used to. */
458 obstack_begin (&dont_print_obstack
, 32 * sizeof (struct type
*));