2012-03-27 Pedro Alves <palves@redhat.com>
[deliverable/binutils-gdb.git] / gdb / mi / mi-cmd-stack.c
1 /* MI Command Set - stack commands.
2 Copyright (C) 2000, 2002-2005, 2007-2012 Free Software Foundation,
3 Inc.
4 Contributed by Cygnus Solutions (a Red Hat company).
5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20
21 #include "defs.h"
22 #include "target.h"
23 #include "frame.h"
24 #include "value.h"
25 #include "mi-cmds.h"
26 #include "ui-out.h"
27 #include "symtab.h"
28 #include "block.h"
29 #include "stack.h"
30 #include "dictionary.h"
31 #include "gdb_string.h"
32 #include "language.h"
33 #include "valprint.h"
34 #include "exceptions.h"
35
36 enum what_to_list { locals, arguments, all };
37
38 static void list_args_or_locals (enum what_to_list what,
39 enum print_values values,
40 struct frame_info *fi);
41
42 /* Print a list of the stack frames. Args can be none, in which case
43 we want to print the whole backtrace, or a pair of numbers
44 specifying the frame numbers at which to start and stop the
45 display. If the two numbers are equal, a single frame will be
46 displayed. */
47
48 void
49 mi_cmd_stack_list_frames (char *command, char **argv, int argc)
50 {
51 int frame_low;
52 int frame_high;
53 int i;
54 struct cleanup *cleanup_stack;
55 struct frame_info *fi;
56
57 if (argc > 2 || argc == 1)
58 error (_("-stack-list-frames: Usage: [FRAME_LOW FRAME_HIGH]"));
59
60 if (argc == 2)
61 {
62 frame_low = atoi (argv[0]);
63 frame_high = atoi (argv[1]);
64 }
65 else
66 {
67 /* Called with no arguments, it means we want the whole
68 backtrace. */
69 frame_low = -1;
70 frame_high = -1;
71 }
72
73 /* Let's position fi on the frame at which to start the
74 display. Could be the innermost frame if the whole stack needs
75 displaying, or if frame_low is 0. */
76 for (i = 0, fi = get_current_frame ();
77 fi && i < frame_low;
78 i++, fi = get_prev_frame (fi));
79
80 if (fi == NULL)
81 error (_("-stack-list-frames: Not enough frames in stack."));
82
83 cleanup_stack = make_cleanup_ui_out_list_begin_end (current_uiout, "stack");
84
85 /* Now let's print the frames up to frame_high, or until there are
86 frames in the stack. */
87 for (;
88 fi && (i <= frame_high || frame_high == -1);
89 i++, fi = get_prev_frame (fi))
90 {
91 QUIT;
92 /* Print the location and the address always, even for level 0.
93 If args is 0, don't print the arguments. */
94 print_frame_info (fi, 1, LOC_AND_ADDRESS, 0 /* args */ );
95 }
96
97 do_cleanups (cleanup_stack);
98 }
99
100 void
101 mi_cmd_stack_info_depth (char *command, char **argv, int argc)
102 {
103 int frame_high;
104 int i;
105 struct frame_info *fi;
106
107 if (argc > 1)
108 error (_("-stack-info-depth: Usage: [MAX_DEPTH]"));
109
110 if (argc == 1)
111 frame_high = atoi (argv[0]);
112 else
113 /* Called with no arguments, it means we want the real depth of
114 the stack. */
115 frame_high = -1;
116
117 for (i = 0, fi = get_current_frame ();
118 fi && (i < frame_high || frame_high == -1);
119 i++, fi = get_prev_frame (fi))
120 QUIT;
121
122 ui_out_field_int (current_uiout, "depth", i);
123 }
124
125 static enum print_values
126 parse_print_values (char *name)
127 {
128 if (strcmp (name, "0") == 0
129 || strcmp (name, mi_no_values) == 0)
130 return PRINT_NO_VALUES;
131 else if (strcmp (name, "1") == 0
132 || strcmp (name, mi_all_values) == 0)
133 return PRINT_ALL_VALUES;
134 else if (strcmp (name, "2") == 0
135 || strcmp (name, mi_simple_values) == 0)
136 return PRINT_SIMPLE_VALUES;
137 else
138 error (_("Unknown value for PRINT_VALUES: must be: \
139 0 or \"%s\", 1 or \"%s\", 2 or \"%s\""),
140 mi_no_values, mi_all_values, mi_simple_values);
141 }
142
143 /* Print a list of the locals for the current frame. With argument of
144 0, print only the names, with argument of 1 print also the
145 values. */
146
147 void
148 mi_cmd_stack_list_locals (char *command, char **argv, int argc)
149 {
150 struct frame_info *frame;
151
152 if (argc != 1)
153 error (_("-stack-list-locals: Usage: PRINT_VALUES"));
154
155 frame = get_selected_frame (NULL);
156
157 list_args_or_locals (locals, parse_print_values (argv[0]), frame);
158 }
159
160 /* Print a list of the arguments for the current frame. With argument
161 of 0, print only the names, with argument of 1 print also the
162 values. */
163
164 void
165 mi_cmd_stack_list_args (char *command, char **argv, int argc)
166 {
167 int frame_low;
168 int frame_high;
169 int i;
170 struct frame_info *fi;
171 struct cleanup *cleanup_stack_args;
172 enum print_values print_values;
173 struct ui_out *uiout = current_uiout;
174
175 if (argc < 1 || argc > 3 || argc == 2)
176 error (_("-stack-list-arguments: Usage: "
177 "PRINT_VALUES [FRAME_LOW FRAME_HIGH]"));
178
179 if (argc == 3)
180 {
181 frame_low = atoi (argv[1]);
182 frame_high = atoi (argv[2]);
183 }
184 else
185 {
186 /* Called with no arguments, it means we want args for the whole
187 backtrace. */
188 frame_low = -1;
189 frame_high = -1;
190 }
191
192 print_values = parse_print_values (argv[0]);
193
194 /* Let's position fi on the frame at which to start the
195 display. Could be the innermost frame if the whole stack needs
196 displaying, or if frame_low is 0. */
197 for (i = 0, fi = get_current_frame ();
198 fi && i < frame_low;
199 i++, fi = get_prev_frame (fi));
200
201 if (fi == NULL)
202 error (_("-stack-list-arguments: Not enough frames in stack."));
203
204 cleanup_stack_args
205 = make_cleanup_ui_out_list_begin_end (uiout, "stack-args");
206
207 /* Now let's print the frames up to frame_high, or until there are
208 frames in the stack. */
209 for (;
210 fi && (i <= frame_high || frame_high == -1);
211 i++, fi = get_prev_frame (fi))
212 {
213 struct cleanup *cleanup_frame;
214
215 QUIT;
216 cleanup_frame = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
217 ui_out_field_int (uiout, "level", i);
218 list_args_or_locals (arguments, print_values, fi);
219 do_cleanups (cleanup_frame);
220 }
221
222 do_cleanups (cleanup_stack_args);
223 }
224
225 /* Print a list of the local variables (including arguments) for the
226 current frame. ARGC must be 1 and ARGV[0] specify if only the names,
227 or both names and values of the variables must be printed. See
228 parse_print_value for possible values. */
229
230 void
231 mi_cmd_stack_list_variables (char *command, char **argv, int argc)
232 {
233 struct frame_info *frame;
234
235 if (argc != 1)
236 error (_("Usage: PRINT_VALUES"));
237
238 frame = get_selected_frame (NULL);
239
240 list_args_or_locals (all, parse_print_values (argv[0]), frame);
241 }
242
243 /* Print single local or argument. ARG must be already read in. For
244 WHAT and VALUES see list_args_or_locals.
245
246 Errors are printed as if they would be the parameter value. Use
247 zeroed ARG iff it should not be printed according to VALUES. */
248
249 static void
250 list_arg_or_local (const struct frame_arg *arg, enum what_to_list what,
251 enum print_values values)
252 {
253 struct cleanup *old_chain;
254 struct cleanup *cleanup_tuple = NULL;
255 struct ui_out *uiout = current_uiout;
256 struct ui_file *stb;
257
258 stb = mem_fileopen ();
259 old_chain = make_cleanup_ui_file_delete (stb);
260
261 gdb_assert (!arg->val || !arg->error);
262 gdb_assert ((values == PRINT_NO_VALUES && arg->val == NULL
263 && arg->error == NULL)
264 || values == PRINT_SIMPLE_VALUES
265 || (values == PRINT_ALL_VALUES
266 && (arg->val != NULL || arg->error != NULL)));
267 gdb_assert (arg->entry_kind == print_entry_values_no
268 || (arg->entry_kind == print_entry_values_only
269 && (arg->val || arg->error)));
270
271 if (values != PRINT_NO_VALUES || what == all)
272 cleanup_tuple = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
273
274 fputs_filtered (SYMBOL_PRINT_NAME (arg->sym), stb);
275 if (arg->entry_kind == print_entry_values_only)
276 fputs_filtered ("@entry", stb);
277 ui_out_field_stream (uiout, "name", stb);
278
279 if (what == all && SYMBOL_IS_ARGUMENT (arg->sym))
280 ui_out_field_int (uiout, "arg", 1);
281
282 if (values == PRINT_SIMPLE_VALUES)
283 {
284 check_typedef (arg->sym->type);
285 type_print (arg->sym->type, "", stb, -1);
286 ui_out_field_stream (uiout, "type", stb);
287 }
288
289 if (arg->val || arg->error)
290 {
291 volatile struct gdb_exception except;
292
293 if (arg->error)
294 except.message = arg->error;
295 else
296 {
297 /* TRY_CATCH has two statements, wrap it in a block. */
298
299 TRY_CATCH (except, RETURN_MASK_ERROR)
300 {
301 struct value_print_options opts;
302
303 get_raw_print_options (&opts);
304 opts.deref_ref = 1;
305 common_val_print (arg->val, stb, 0, &opts,
306 language_def (SYMBOL_LANGUAGE (arg->sym)));
307 }
308 }
309 if (except.message)
310 fprintf_filtered (stb, _("<error reading variable: %s>"),
311 except.message);
312 ui_out_field_stream (uiout, "value", stb);
313 }
314
315 if (values != PRINT_NO_VALUES || what == all)
316 do_cleanups (cleanup_tuple);
317 do_cleanups (old_chain);
318 }
319
320 /* Print a list of the locals or the arguments for the currently
321 selected frame. If the argument passed is 0, printonly the names
322 of the variables, if an argument of 1 is passed, print the values
323 as well. */
324
325 static void
326 list_args_or_locals (enum what_to_list what, enum print_values values,
327 struct frame_info *fi)
328 {
329 struct block *block;
330 struct symbol *sym;
331 struct dict_iterator iter;
332 struct cleanup *cleanup_list;
333 struct type *type;
334 char *name_of_result;
335 struct ui_out *uiout = current_uiout;
336
337 block = get_frame_block (fi, 0);
338
339 switch (what)
340 {
341 case locals:
342 name_of_result = "locals";
343 break;
344 case arguments:
345 name_of_result = "args";
346 break;
347 case all:
348 name_of_result = "variables";
349 break;
350 default:
351 internal_error (__FILE__, __LINE__,
352 "unexpected what_to_list: %d", (int) what);
353 }
354
355 cleanup_list = make_cleanup_ui_out_list_begin_end (uiout, name_of_result);
356
357 while (block != 0)
358 {
359 ALL_BLOCK_SYMBOLS (block, iter, sym)
360 {
361 int print_me = 0;
362
363 switch (SYMBOL_CLASS (sym))
364 {
365 default:
366 case LOC_UNDEF: /* catches errors */
367 case LOC_CONST: /* constant */
368 case LOC_TYPEDEF: /* local typedef */
369 case LOC_LABEL: /* local label */
370 case LOC_BLOCK: /* local function */
371 case LOC_CONST_BYTES: /* loc. byte seq. */
372 case LOC_UNRESOLVED: /* unresolved static */
373 case LOC_OPTIMIZED_OUT: /* optimized out */
374 print_me = 0;
375 break;
376
377 case LOC_ARG: /* argument */
378 case LOC_REF_ARG: /* reference arg */
379 case LOC_REGPARM_ADDR: /* indirect register arg */
380 case LOC_LOCAL: /* stack local */
381 case LOC_STATIC: /* static */
382 case LOC_REGISTER: /* register */
383 case LOC_COMPUTED: /* computed location */
384 if (what == all)
385 print_me = 1;
386 else if (what == locals)
387 print_me = !SYMBOL_IS_ARGUMENT (sym);
388 else
389 print_me = SYMBOL_IS_ARGUMENT (sym);
390 break;
391 }
392 if (print_me)
393 {
394 struct symbol *sym2;
395 struct frame_arg arg, entryarg;
396
397 if (SYMBOL_IS_ARGUMENT (sym))
398 sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
399 block, VAR_DOMAIN,
400 (int *) NULL);
401 else
402 sym2 = sym;
403 gdb_assert (sym2 != NULL);
404
405 memset (&arg, 0, sizeof (arg));
406 arg.sym = sym2;
407 arg.entry_kind = print_entry_values_no;
408 memset (&entryarg, 0, sizeof (entryarg));
409 entryarg.sym = sym2;
410 entryarg.entry_kind = print_entry_values_no;
411
412 switch (values)
413 {
414 case PRINT_SIMPLE_VALUES:
415 type = check_typedef (sym2->type);
416 if (TYPE_CODE (type) != TYPE_CODE_ARRAY
417 && TYPE_CODE (type) != TYPE_CODE_STRUCT
418 && TYPE_CODE (type) != TYPE_CODE_UNION)
419 {
420 case PRINT_ALL_VALUES:
421 read_frame_arg (sym2, fi, &arg, &entryarg);
422 }
423 break;
424 }
425
426 if (arg.entry_kind != print_entry_values_only)
427 list_arg_or_local (&arg, what, values);
428 if (entryarg.entry_kind != print_entry_values_no)
429 list_arg_or_local (&entryarg, what, values);
430 xfree (arg.error);
431 xfree (entryarg.error);
432 }
433 }
434
435 if (BLOCK_FUNCTION (block))
436 break;
437 else
438 block = BLOCK_SUPERBLOCK (block);
439 }
440 do_cleanups (cleanup_list);
441 }
442
443 void
444 mi_cmd_stack_select_frame (char *command, char **argv, int argc)
445 {
446 if (argc == 0 || argc > 1)
447 error (_("-stack-select-frame: Usage: FRAME_SPEC"));
448
449 select_frame_command (argv[0], 1 /* not used */ );
450 }
451
452 void
453 mi_cmd_stack_info_frame (char *command, char **argv, int argc)
454 {
455 if (argc > 0)
456 error (_("-stack-info-frame: No arguments allowed"));
457
458 print_frame_info (get_selected_frame (NULL), 1, LOC_AND_ADDRESS, 0);
459 }
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