Lint fixes from Paul Eggert (eggert@twinsun.com):
[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'))
a8a69e63 115 {
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116 if (addressprint && format != 's')
117 {
118 fprintf_filtered (stream, "0x%x ", address);
119 }
a8a69e63 120 LA_PRINT_STRING (stream, valaddr, len, 0);
ec16f701 121 i = len;
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122 }
123 else
124 {
c4413e2c 125 fprintf_filtered (stream, "{");
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126 /* If this is a virtual function table, print the 0th
127 entry specially, and the rest of the members normally. */
128 if (cp_is_vtbl_ptr_type (elttype))
129 {
130 i = 1;
131 fprintf_filtered (stream, "%d vtable entries", len - 1);
132 }
133 else
134 {
135 i = 0;
136 }
137 val_print_array_elements (type, valaddr, address, stream,
138 format, deref_ref, recurse, pretty, i);
c4413e2c 139 fprintf_filtered (stream, "}");
a8a69e63 140 }
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141 break;
142 }
143 /* Array of unspecified length: treat like pointer to first elt. */
144 valaddr = (char *) &address;
c4413e2c 145 /* FALL THROUGH */
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146
147 case TYPE_CODE_PTR:
148 if (format && format != 's')
149 {
150 print_scalar_formatted (valaddr, type, format, 0, stream);
151 break;
152 }
153 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
154 {
c7da3ed3 155 cp_print_class_method (valaddr, type, stream);
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156 }
157 else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
158 {
159 cp_print_class_member (valaddr,
160 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
161 stream, "&");
162 }
163 else
164 {
c4413e2c 165 addr = unpack_pointer (type, valaddr);
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166 elttype = TYPE_TARGET_TYPE (type);
167
168 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
169 {
170 /* Try to print what function it points to. */
171 print_address_demangle (addr, stream, demangle);
172 /* Return value is irrelevant except for string pointers. */
173 return (0);
174 }
175
176 if (addressprint && format != 's')
177 {
178 fprintf_filtered (stream, "0x%x", addr);
179 }
180
181 /* For a pointer to char or unsigned char, also print the string
182 pointed to, unless pointer is null. */
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183 if (TYPE_LENGTH (elttype) == 1
184 && TYPE_CODE (elttype) == TYPE_CODE_INT
185 && (format == 0 || format == 's')
186 && addr != 0)
a8a69e63 187 {
c4413e2c 188 i = val_print_string (addr, 0, stream);
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189 }
190 else if (cp_is_vtbl_member(type))
191 {
192 /* print vtbl's nicely */
193 CORE_ADDR vt_address = unpack_pointer (type, valaddr);
194
195 struct minimal_symbol *msymbol =
196 lookup_minimal_symbol_by_pc (vt_address);
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197 if ((msymbol != NULL) &&
198 (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
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199 {
200 fputs_filtered (" <", stream);
2e4964ad 201 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream);
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202 fputs_filtered (">", stream);
203 }
204 if (vtblprint)
205 {
206 value vt_val;
207
208 vt_val = value_at (TYPE_TARGET_TYPE (type), vt_address);
209 val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val),
210 VALUE_ADDRESS (vt_val), stream, format,
211 deref_ref, recurse + 1, pretty);
212 if (pretty)
213 {
214 fprintf_filtered (stream, "\n");
215 print_spaces_filtered (2 + 2 * recurse, stream);
216 }
217 }
218 }
219
220 /* Return number of characters printed, plus one for the
221 terminating null if we have "reached the end". */
222 return (i + (print_max && i != print_max));
223 }
224 break;
225
226 case TYPE_CODE_MEMBER:
227 error ("not implemented: member type in c_val_print");
228 break;
229
230 case TYPE_CODE_REF:
231 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
232 {
233 cp_print_class_member (valaddr,
234 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
235 stream, "");
236 break;
237 }
238 if (addressprint)
239 {
240 fprintf_filtered (stream, "@0x%lx",
241 unpack_long (builtin_type_int, valaddr));
242 if (deref_ref)
243 fputs_filtered (": ", stream);
244 }
245 /* De-reference the reference. */
246 if (deref_ref)
247 {
248 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
249 {
250 value deref_val =
251 value_at
252 (TYPE_TARGET_TYPE (type),
253 unpack_pointer (lookup_pointer_type (builtin_type_void),
254 valaddr));
255 val_print (VALUE_TYPE (deref_val),
256 VALUE_CONTENTS (deref_val),
257 VALUE_ADDRESS (deref_val), stream, format,
258 deref_ref, recurse + 1, pretty);
259 }
260 else
261 fputs_filtered ("???", stream);
262 }
263 break;
264
265 case TYPE_CODE_UNION:
266 if (recurse && !unionprint)
267 {
268 fprintf_filtered (stream, "{...}");
269 break;
270 }
271 /* Fall through. */
272 case TYPE_CODE_STRUCT:
273 if (vtblprint && cp_is_vtbl_ptr_type(type))
274 {
275 /* Print the unmangled name if desired. */
276 print_address_demangle(*((int *) (valaddr + /* FIXME bytesex */
277 TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8)),
278 stream, demangle);
279 break;
280 }
281 cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
282 0);
283 break;
284
285 case TYPE_CODE_ENUM:
286 if (format)
287 {
288 print_scalar_formatted (valaddr, type, format, 0, stream);
289 break;
290 }
291 len = TYPE_NFIELDS (type);
1d9449ab 292 val = unpack_long (type, valaddr);
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293 for (i = 0; i < len; i++)
294 {
295 QUIT;
296 if (val == TYPE_FIELD_BITPOS (type, i))
297 {
298 break;
299 }
300 }
301 if (i < len)
302 {
303 fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
304 }
305 else
306 {
307#ifdef LONG_LONG
308 fprintf_filtered (stream, "%lld", val);
309#else
310 fprintf_filtered (stream, "%ld", val);
311#endif
312 }
313 break;
314
315 case TYPE_CODE_FUNC:
316 if (format)
317 {
318 print_scalar_formatted (valaddr, type, format, 0, stream);
319 break;
320 }
321 /* FIXME, we should consider, at least for ANSI C language, eliminating
322 the distinction made between FUNCs and POINTERs to FUNCs. */
323 fprintf_filtered (stream, "{");
324 type_print (type, "", stream, -1);
325 fprintf_filtered (stream, "} ");
326 /* Try to print what function it points to, and its address. */
327 print_address_demangle (address, stream, demangle);
328 break;
329
330 case TYPE_CODE_INT:
331 format = format ? format : output_format;
332 if (format)
333 {
334 print_scalar_formatted (valaddr, type, format, 0, stream);
335 }
336 else
337 {
338 val_print_type_code_int (type, valaddr, stream);
339 /* C and C++ has no single byte int type, char is used instead.
340 Since we don't know whether the value is really intended to
341 be used as an integer or a character, print the character
342 equivalent as well. */
343 if (TYPE_LENGTH (type) == 1)
344 {
345 fputs_filtered (" ", stream);
346 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
347 stream);
348 }
349 }
350 break;
351
352 case TYPE_CODE_CHAR:
353 format = format ? format : output_format;
354 if (format)
355 {
356 print_scalar_formatted (valaddr, type, format, 0, stream);
357 }
358 else
359 {
360 fprintf_filtered (stream, TYPE_UNSIGNED (type) ? "%u" : "%d",
361 unpack_long (type, valaddr));
362 fputs_filtered (" ", stream);
363 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), stream);
364 }
365 break;
366
367 case TYPE_CODE_FLT:
368 if (format)
369 {
370 print_scalar_formatted (valaddr, type, format, 0, stream);
371 }
372 else
373 {
374 print_floating (valaddr, type, stream);
375 }
376 break;
377
378 case TYPE_CODE_VOID:
379 fprintf_filtered (stream, "void");
380 break;
381
382 case TYPE_CODE_ERROR:
383 fprintf_filtered (stream, "<error type>");
384 break;
385
386 case TYPE_CODE_RANGE:
387 /* FIXME, we should not ever have to print one of these yet. */
388 fprintf_filtered (stream, "<range type>");
389 break;
390
391 case TYPE_CODE_UNDEF:
392 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
393 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
394 and no complete type for struct foo in that file. */
395 fprintf_filtered (stream, "<incomplete type>");
396 break;
397
398 default:
399 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type));
400 }
401 fflush (stream);
402 return (0);
403}
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