* hppa-tdep.c: Remove all uses of use_unwind and `set use_unwind'
[deliverable/binutils-gdb.git] / gdb / c-valprint.c
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1/* Support for printing C values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc.
3
4This file is part of GDB.
5
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2 of the License, or
9(at your option) any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with this program; if not, write to the Free Software
18Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19
20#include "defs.h"
21#include "symtab.h"
22#include "gdbtypes.h"
23#include "expression.h"
24#include "value.h"
25#include "demangle.h"
26#include "valprint.h"
27#include "language.h"
28
29/* BEGIN-FIXME */
30
31extern int vtblprint; /* Controls printing of vtbl's */
32extern int demangle; /* whether to print C++ syms raw or src-form */
33
34extern void
35cp_print_class_member PARAMS ((char *, struct type *, FILE *, char *));
36
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37extern void
38cp_print_class_method PARAMS ((char *, struct type *, FILE *));
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39
40extern void
41cp_print_value_fields PARAMS ((struct type *, char *, FILE *, int, int,
42 enum val_prettyprint, struct type **));
43
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44extern int
45cp_is_vtbl_ptr_type PARAMS ((struct type *));
46
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47extern int
48cp_is_vtbl_member PARAMS ((struct type *));
49
50/* END-FIXME */
51
52
53/* BEGIN-FIXME: Hooks into c-typeprint.c */
54
55extern void
56c_type_print_varspec_prefix PARAMS ((struct type *, FILE *, int, int));
57
58extern void
59cp_type_print_method_args PARAMS ((struct type **, char *, char *, int,
60 FILE *));
61/* END-FIXME */
62
63
64extern struct obstack dont_print_obstack;
65
66\f
67/* Print data of type TYPE located at VALADDR (within GDB), which came from
68 the inferior at address ADDRESS, onto stdio stream STREAM according to
69 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
70 target byte order.
71
72 If the data are a string pointer, returns the number of string characters
73 printed.
74
75 If DEREF_REF is nonzero, then dereference references, otherwise just print
76 them like pointers.
77
78 The PRETTY parameter controls prettyprinting. */
79
80int
81c_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
82 pretty)
83 struct type *type;
84 char *valaddr;
85 CORE_ADDR address;
86 FILE *stream;
87 int format;
88 int deref_ref;
89 int recurse;
90 enum val_prettyprint pretty;
91{
c4413e2c 92 register unsigned int i = 0; /* Number of characters printed */
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93 unsigned len;
94 struct type *elttype;
95 unsigned eltlen;
96 LONGEST val;
97 unsigned char c;
c4413e2c 98 CORE_ADDR addr;
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99
100 switch (TYPE_CODE (type))
101 {
102 case TYPE_CODE_ARRAY:
103 if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
104 {
105 elttype = TYPE_TARGET_TYPE (type);
106 eltlen = TYPE_LENGTH (elttype);
107 len = TYPE_LENGTH (type) / eltlen;
108 if (prettyprint_arrays)
109 {
110 print_spaces_filtered (2 + 2 * recurse, stream);
111 }
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112 /* For an array of chars, print with string syntax. */
113 if (eltlen == 1 && TYPE_CODE (elttype) == TYPE_CODE_INT
c4413e2c 114 && (format == 0 || format == 's'))
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115 {
116 LA_PRINT_STRING (stream, valaddr, len, 0);
ec16f701 117 i = len;
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118 }
119 else
120 {
c4413e2c 121 fprintf_filtered (stream, "{");
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122 /* If this is a virtual function table, print the 0th
123 entry specially, and the rest of the members normally. */
124 if (cp_is_vtbl_ptr_type (elttype))
125 {
126 i = 1;
127 fprintf_filtered (stream, "%d vtable entries", len - 1);
128 }
129 else
130 {
131 i = 0;
132 }
133 val_print_array_elements (type, valaddr, address, stream,
134 format, deref_ref, recurse, pretty, i);
c4413e2c 135 fprintf_filtered (stream, "}");
a8a69e63 136 }
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137 break;
138 }
139 /* Array of unspecified length: treat like pointer to first elt. */
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140 addr = address;
141 goto print_unpacked_pointer;
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142
143 case TYPE_CODE_PTR:
144 if (format && format != 's')
145 {
146 print_scalar_formatted (valaddr, type, format, 0, stream);
147 break;
148 }
149 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
150 {
c7da3ed3 151 cp_print_class_method (valaddr, type, stream);
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152 }
153 else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
154 {
155 cp_print_class_member (valaddr,
156 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
157 stream, "&");
158 }
159 else
160 {
c4413e2c 161 addr = unpack_pointer (type, valaddr);
1326dace 162 print_unpacked_pointer:
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163 elttype = TYPE_TARGET_TYPE (type);
164
165 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
166 {
167 /* Try to print what function it points to. */
168 print_address_demangle (addr, stream, demangle);
169 /* Return value is irrelevant except for string pointers. */
170 return (0);
171 }
172
173 if (addressprint && format != 's')
174 {
175 fprintf_filtered (stream, "0x%x", addr);
176 }
177
178 /* For a pointer to char or unsigned char, also print the string
179 pointed to, unless pointer is null. */
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180 if (TYPE_LENGTH (elttype) == 1
181 && TYPE_CODE (elttype) == TYPE_CODE_INT
182 && (format == 0 || format == 's')
183 && addr != 0)
a8a69e63 184 {
c4413e2c 185 i = val_print_string (addr, 0, stream);
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186 }
187 else if (cp_is_vtbl_member(type))
188 {
189 /* print vtbl's nicely */
190 CORE_ADDR vt_address = unpack_pointer (type, valaddr);
191
192 struct minimal_symbol *msymbol =
193 lookup_minimal_symbol_by_pc (vt_address);
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194 if ((msymbol != NULL) &&
195 (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
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196 {
197 fputs_filtered (" <", stream);
2e4964ad 198 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream);
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199 fputs_filtered (">", stream);
200 }
201 if (vtblprint)
202 {
203 value vt_val;
204
205 vt_val = value_at (TYPE_TARGET_TYPE (type), vt_address);
206 val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val),
207 VALUE_ADDRESS (vt_val), stream, format,
208 deref_ref, recurse + 1, pretty);
209 if (pretty)
210 {
211 fprintf_filtered (stream, "\n");
212 print_spaces_filtered (2 + 2 * recurse, stream);
213 }
214 }
215 }
216
217 /* Return number of characters printed, plus one for the
218 terminating null if we have "reached the end". */
219 return (i + (print_max && i != print_max));
220 }
221 break;
222
223 case TYPE_CODE_MEMBER:
224 error ("not implemented: member type in c_val_print");
225 break;
226
227 case TYPE_CODE_REF:
228 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
229 {
230 cp_print_class_member (valaddr,
231 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
232 stream, "");
233 break;
234 }
235 if (addressprint)
236 {
237 fprintf_filtered (stream, "@0x%lx",
238 unpack_long (builtin_type_int, valaddr));
239 if (deref_ref)
240 fputs_filtered (": ", stream);
241 }
242 /* De-reference the reference. */
243 if (deref_ref)
244 {
245 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
246 {
247 value deref_val =
248 value_at
249 (TYPE_TARGET_TYPE (type),
250 unpack_pointer (lookup_pointer_type (builtin_type_void),
251 valaddr));
252 val_print (VALUE_TYPE (deref_val),
253 VALUE_CONTENTS (deref_val),
254 VALUE_ADDRESS (deref_val), stream, format,
255 deref_ref, recurse + 1, pretty);
256 }
257 else
258 fputs_filtered ("???", stream);
259 }
260 break;
261
262 case TYPE_CODE_UNION:
263 if (recurse && !unionprint)
264 {
265 fprintf_filtered (stream, "{...}");
266 break;
267 }
268 /* Fall through. */
269 case TYPE_CODE_STRUCT:
270 if (vtblprint && cp_is_vtbl_ptr_type(type))
271 {
272 /* Print the unmangled name if desired. */
273 print_address_demangle(*((int *) (valaddr + /* FIXME bytesex */
274 TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8)),
275 stream, demangle);
276 break;
277 }
278 cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
279 0);
280 break;
281
282 case TYPE_CODE_ENUM:
283 if (format)
284 {
285 print_scalar_formatted (valaddr, type, format, 0, stream);
286 break;
287 }
288 len = TYPE_NFIELDS (type);
1d9449ab 289 val = unpack_long (type, valaddr);
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290 for (i = 0; i < len; i++)
291 {
292 QUIT;
293 if (val == TYPE_FIELD_BITPOS (type, i))
294 {
295 break;
296 }
297 }
298 if (i < len)
299 {
300 fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
301 }
302 else
303 {
7efb57c3 304 print_longest (stream, 'd', 0, val);
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305 }
306 break;
307
308 case TYPE_CODE_FUNC:
309 if (format)
310 {
311 print_scalar_formatted (valaddr, type, format, 0, stream);
312 break;
313 }
314 /* FIXME, we should consider, at least for ANSI C language, eliminating
315 the distinction made between FUNCs and POINTERs to FUNCs. */
316 fprintf_filtered (stream, "{");
317 type_print (type, "", stream, -1);
318 fprintf_filtered (stream, "} ");
319 /* Try to print what function it points to, and its address. */
320 print_address_demangle (address, stream, demangle);
321 break;
322
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323 case TYPE_CODE_BOOL:
324 /* Do something at least vaguely reasonable, for example if the
325 language is set wrong. */
326
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327 case TYPE_CODE_INT:
328 format = format ? format : output_format;
329 if (format)
330 {
331 print_scalar_formatted (valaddr, type, format, 0, stream);
332 }
333 else
334 {
335 val_print_type_code_int (type, valaddr, stream);
336 /* C and C++ has no single byte int type, char is used instead.
337 Since we don't know whether the value is really intended to
338 be used as an integer or a character, print the character
339 equivalent as well. */
340 if (TYPE_LENGTH (type) == 1)
341 {
342 fputs_filtered (" ", stream);
343 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
344 stream);
345 }
346 }
347 break;
348
349 case TYPE_CODE_CHAR:
350 format = format ? format : output_format;
351 if (format)
352 {
353 print_scalar_formatted (valaddr, type, format, 0, stream);
354 }
355 else
356 {
357 fprintf_filtered (stream, TYPE_UNSIGNED (type) ? "%u" : "%d",
358 unpack_long (type, valaddr));
359 fputs_filtered (" ", stream);
360 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), stream);
361 }
362 break;
363
364 case TYPE_CODE_FLT:
365 if (format)
366 {
367 print_scalar_formatted (valaddr, type, format, 0, stream);
368 }
369 else
370 {
371 print_floating (valaddr, type, stream);
372 }
373 break;
374
375 case TYPE_CODE_VOID:
376 fprintf_filtered (stream, "void");
377 break;
378
379 case TYPE_CODE_ERROR:
380 fprintf_filtered (stream, "<error type>");
381 break;
382
383 case TYPE_CODE_RANGE:
384 /* FIXME, we should not ever have to print one of these yet. */
385 fprintf_filtered (stream, "<range type>");
386 break;
387
388 case TYPE_CODE_UNDEF:
389 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
390 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
391 and no complete type for struct foo in that file. */
392 fprintf_filtered (stream, "<incomplete type>");
393 break;
394
395 default:
396 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type));
397 }
398 fflush (stream);
399 return (0);
400}
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