* Makefile.in (VERSION): Bump to 4.9.2.
[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. */
140 valaddr = (char *) &address;
c4413e2c 141 /* FALL THROUGH */
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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);
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162 elttype = TYPE_TARGET_TYPE (type);
163
164 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
165 {
166 /* Try to print what function it points to. */
167 print_address_demangle (addr, stream, demangle);
168 /* Return value is irrelevant except for string pointers. */
169 return (0);
170 }
171
172 if (addressprint && format != 's')
173 {
174 fprintf_filtered (stream, "0x%x", addr);
175 }
176
177 /* For a pointer to char or unsigned char, also print the string
178 pointed to, unless pointer is null. */
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179 if (TYPE_LENGTH (elttype) == 1
180 && TYPE_CODE (elttype) == TYPE_CODE_INT
181 && (format == 0 || format == 's')
182 && addr != 0)
a8a69e63 183 {
c4413e2c 184 i = val_print_string (addr, 0, stream);
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185 }
186 else if (cp_is_vtbl_member(type))
187 {
188 /* print vtbl's nicely */
189 CORE_ADDR vt_address = unpack_pointer (type, valaddr);
190
191 struct minimal_symbol *msymbol =
192 lookup_minimal_symbol_by_pc (vt_address);
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193 if ((msymbol != NULL) &&
194 (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
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195 {
196 fputs_filtered (" <", stream);
2e4964ad 197 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream);
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198 fputs_filtered (">", stream);
199 }
200 if (vtblprint)
201 {
202 value vt_val;
203
204 vt_val = value_at (TYPE_TARGET_TYPE (type), vt_address);
205 val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val),
206 VALUE_ADDRESS (vt_val), stream, format,
207 deref_ref, recurse + 1, pretty);
208 if (pretty)
209 {
210 fprintf_filtered (stream, "\n");
211 print_spaces_filtered (2 + 2 * recurse, stream);
212 }
213 }
214 }
215
216 /* Return number of characters printed, plus one for the
217 terminating null if we have "reached the end". */
218 return (i + (print_max && i != print_max));
219 }
220 break;
221
222 case TYPE_CODE_MEMBER:
223 error ("not implemented: member type in c_val_print");
224 break;
225
226 case TYPE_CODE_REF:
227 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
228 {
229 cp_print_class_member (valaddr,
230 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
231 stream, "");
232 break;
233 }
234 if (addressprint)
235 {
236 fprintf_filtered (stream, "@0x%lx",
237 unpack_long (builtin_type_int, valaddr));
238 if (deref_ref)
239 fputs_filtered (": ", stream);
240 }
241 /* De-reference the reference. */
242 if (deref_ref)
243 {
244 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
245 {
246 value deref_val =
247 value_at
248 (TYPE_TARGET_TYPE (type),
249 unpack_pointer (lookup_pointer_type (builtin_type_void),
250 valaddr));
251 val_print (VALUE_TYPE (deref_val),
252 VALUE_CONTENTS (deref_val),
253 VALUE_ADDRESS (deref_val), stream, format,
254 deref_ref, recurse + 1, pretty);
255 }
256 else
257 fputs_filtered ("???", stream);
258 }
259 break;
260
261 case TYPE_CODE_UNION:
262 if (recurse && !unionprint)
263 {
264 fprintf_filtered (stream, "{...}");
265 break;
266 }
267 /* Fall through. */
268 case TYPE_CODE_STRUCT:
269 if (vtblprint && cp_is_vtbl_ptr_type(type))
270 {
271 /* Print the unmangled name if desired. */
272 print_address_demangle(*((int *) (valaddr + /* FIXME bytesex */
273 TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8)),
274 stream, demangle);
275 break;
276 }
277 cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
278 0);
279 break;
280
281 case TYPE_CODE_ENUM:
282 if (format)
283 {
284 print_scalar_formatted (valaddr, type, format, 0, stream);
285 break;
286 }
287 len = TYPE_NFIELDS (type);
1d9449ab 288 val = unpack_long (type, valaddr);
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289 for (i = 0; i < len; i++)
290 {
291 QUIT;
292 if (val == TYPE_FIELD_BITPOS (type, i))
293 {
294 break;
295 }
296 }
297 if (i < len)
298 {
299 fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
300 }
301 else
302 {
7efb57c3 303 print_longest (stream, 'd', 0, val);
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304 }
305 break;
306
307 case TYPE_CODE_FUNC:
308 if (format)
309 {
310 print_scalar_formatted (valaddr, type, format, 0, stream);
311 break;
312 }
313 /* FIXME, we should consider, at least for ANSI C language, eliminating
314 the distinction made between FUNCs and POINTERs to FUNCs. */
315 fprintf_filtered (stream, "{");
316 type_print (type, "", stream, -1);
317 fprintf_filtered (stream, "} ");
318 /* Try to print what function it points to, and its address. */
319 print_address_demangle (address, stream, demangle);
320 break;
321
322 case TYPE_CODE_INT:
323 format = format ? format : output_format;
324 if (format)
325 {
326 print_scalar_formatted (valaddr, type, format, 0, stream);
327 }
328 else
329 {
330 val_print_type_code_int (type, valaddr, stream);
331 /* C and C++ has no single byte int type, char is used instead.
332 Since we don't know whether the value is really intended to
333 be used as an integer or a character, print the character
334 equivalent as well. */
335 if (TYPE_LENGTH (type) == 1)
336 {
337 fputs_filtered (" ", stream);
338 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
339 stream);
340 }
341 }
342 break;
343
344 case TYPE_CODE_CHAR:
345 format = format ? format : output_format;
346 if (format)
347 {
348 print_scalar_formatted (valaddr, type, format, 0, stream);
349 }
350 else
351 {
352 fprintf_filtered (stream, TYPE_UNSIGNED (type) ? "%u" : "%d",
353 unpack_long (type, valaddr));
354 fputs_filtered (" ", stream);
355 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), stream);
356 }
357 break;
358
359 case TYPE_CODE_FLT:
360 if (format)
361 {
362 print_scalar_formatted (valaddr, type, format, 0, stream);
363 }
364 else
365 {
366 print_floating (valaddr, type, stream);
367 }
368 break;
369
370 case TYPE_CODE_VOID:
371 fprintf_filtered (stream, "void");
372 break;
373
374 case TYPE_CODE_ERROR:
375 fprintf_filtered (stream, "<error type>");
376 break;
377
378 case TYPE_CODE_RANGE:
379 /* FIXME, we should not ever have to print one of these yet. */
380 fprintf_filtered (stream, "<range type>");
381 break;
382
383 case TYPE_CODE_UNDEF:
384 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
385 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
386 and no complete type for struct foo in that file. */
387 fprintf_filtered (stream, "<incomplete type>");
388 break;
389
390 default:
391 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type));
392 }
393 fflush (stream);
394 return (0);
395}
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