Commit | Line | Data |
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04714b91 AC |
1 | /* Perform an inferior function call, for GDB, the GNU debugger. |
2 | ||
6aba47ca | 3 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
9b254dd1 | 4 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
0fb0cc75 | 5 | 2008, 2009 Free Software Foundation, Inc. |
04714b91 AC |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
04714b91 AC |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
04714b91 AC |
21 | |
22 | #include "defs.h" | |
23 | #include "breakpoint.h" | |
24 | #include "target.h" | |
25 | #include "regcache.h" | |
26 | #include "inferior.h" | |
27 | #include "gdb_assert.h" | |
28 | #include "block.h" | |
29 | #include "gdbcore.h" | |
30 | #include "language.h" | |
9ab9195f | 31 | #include "objfiles.h" |
04714b91 AC |
32 | #include "gdbcmd.h" |
33 | #include "command.h" | |
34 | #include "gdb_string.h" | |
b9362cc7 | 35 | #include "infcall.h" |
96860204 | 36 | #include "dummy-frame.h" |
a93c0eb6 | 37 | #include "ada-lang.h" |
347bddb7 | 38 | #include "gdbthread.h" |
b89667eb DE |
39 | #include "exceptions.h" |
40 | ||
41 | /* If we can't find a function's name from its address, | |
42 | we print this instead. */ | |
43 | #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" | |
44 | #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ | |
45 | + 2 * sizeof (CORE_ADDR)) | |
04714b91 AC |
46 | |
47 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
48 | ||
49 | GDB needs an asynchronous expression evaluator, that means an | |
50 | asynchronous inferior function call implementation, and that in | |
51 | turn means restructuring the code so that it is event driven. */ | |
52 | ||
53 | /* How you should pass arguments to a function depends on whether it | |
54 | was defined in K&R style or prototype style. If you define a | |
55 | function using the K&R syntax that takes a `float' argument, then | |
56 | callers must pass that argument as a `double'. If you define the | |
57 | function using the prototype syntax, then you must pass the | |
58 | argument as a `float', with no promotion. | |
59 | ||
60 | Unfortunately, on certain older platforms, the debug info doesn't | |
61 | indicate reliably how each function was defined. A function type's | |
62 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was | |
63 | defined in prototype style. When calling a function whose | |
64 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to | |
65 | decide what to do. | |
66 | ||
67 | For modern targets, it is proper to assume that, if the prototype | |
68 | flag is clear, that can be trusted: `float' arguments should be | |
69 | promoted to `double'. For some older targets, if the prototype | |
70 | flag is clear, that doesn't tell us anything. The default is to | |
71 | trust the debug information; the user can override this behavior | |
72 | with "set coerce-float-to-double 0". */ | |
73 | ||
74 | static int coerce_float_to_double_p = 1; | |
920d2a44 AC |
75 | static void |
76 | show_coerce_float_to_double_p (struct ui_file *file, int from_tty, | |
77 | struct cmd_list_element *c, const char *value) | |
78 | { | |
79 | fprintf_filtered (file, _("\ | |
80 | Coercion of floats to doubles when calling functions is %s.\n"), | |
81 | value); | |
82 | } | |
04714b91 AC |
83 | |
84 | /* This boolean tells what gdb should do if a signal is received while | |
85 | in a function called from gdb (call dummy). If set, gdb unwinds | |
86 | the stack and restore the context to what as it was before the | |
87 | call. | |
88 | ||
89 | The default is to stop in the frame where the signal was received. */ | |
90 | ||
91 | int unwind_on_signal_p = 0; | |
920d2a44 AC |
92 | static void |
93 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, | |
94 | struct cmd_list_element *c, const char *value) | |
95 | { | |
96 | fprintf_filtered (file, _("\ | |
97 | Unwinding of stack if a signal is received while in a call dummy is %s.\n"), | |
98 | value); | |
99 | } | |
100 | ||
04714b91 AC |
101 | |
102 | /* Perform the standard coercions that are specified | |
a93c0eb6 | 103 | for arguments to be passed to C or Ada functions. |
04714b91 AC |
104 | |
105 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
a93c0eb6 JB |
106 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
107 | SP is the stack pointer were additional data can be pushed (updating | |
108 | its value as needed). */ | |
04714b91 AC |
109 | |
110 | static struct value * | |
7788af6d UW |
111 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
112 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) | |
04714b91 | 113 | { |
7788af6d | 114 | const struct builtin_type *builtin = builtin_type (gdbarch); |
df407dfe | 115 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 116 | struct type *type |
04714b91 AC |
117 | = param_type ? check_typedef (param_type) : arg_type; |
118 | ||
a93c0eb6 JB |
119 | /* Perform any Ada-specific coercion first. */ |
120 | if (current_language->la_language == language_ada) | |
121 | arg = ada_convert_actual (arg, type, sp); | |
122 | ||
63092375 DJ |
123 | /* Force the value to the target if we will need its address. At |
124 | this point, we could allocate arguments on the stack instead of | |
125 | calling malloc if we knew that their addresses would not be | |
126 | saved by the called function. */ | |
127 | arg = value_coerce_to_target (arg); | |
128 | ||
04714b91 AC |
129 | switch (TYPE_CODE (type)) |
130 | { | |
131 | case TYPE_CODE_REF: | |
fb933624 DJ |
132 | { |
133 | struct value *new_value; | |
134 | ||
135 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) | |
136 | return value_cast_pointers (type, arg); | |
137 | ||
138 | /* Cast the value to the reference's target type, and then | |
139 | convert it back to a reference. This will issue an error | |
140 | if the value was not previously in memory - in some cases | |
141 | we should clearly be allowing this, but how? */ | |
142 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); | |
143 | new_value = value_ref (new_value); | |
144 | return new_value; | |
145 | } | |
04714b91 AC |
146 | case TYPE_CODE_INT: |
147 | case TYPE_CODE_CHAR: | |
148 | case TYPE_CODE_BOOL: | |
149 | case TYPE_CODE_ENUM: | |
150 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
151 | if (!is_prototyped) | |
152 | { | |
7788af6d UW |
153 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
154 | type = builtin->builtin_int; | |
04714b91 AC |
155 | } |
156 | /* Currently all target ABIs require at least the width of an integer | |
157 | type for an argument. We may have to conditionalize the following | |
158 | type coercion for future targets. */ | |
7788af6d UW |
159 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
160 | type = builtin->builtin_int; | |
04714b91 AC |
161 | break; |
162 | case TYPE_CODE_FLT: | |
163 | if (!is_prototyped && coerce_float_to_double_p) | |
164 | { | |
7788af6d UW |
165 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
166 | type = builtin->builtin_double; | |
167 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) | |
168 | type = builtin->builtin_long_double; | |
04714b91 AC |
169 | } |
170 | break; | |
171 | case TYPE_CODE_FUNC: | |
172 | type = lookup_pointer_type (type); | |
173 | break; | |
174 | case TYPE_CODE_ARRAY: | |
175 | /* Arrays are coerced to pointers to their first element, unless | |
176 | they are vectors, in which case we want to leave them alone, | |
177 | because they are passed by value. */ | |
178 | if (current_language->c_style_arrays) | |
179 | if (!TYPE_VECTOR (type)) | |
180 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
181 | break; | |
182 | case TYPE_CODE_UNDEF: | |
183 | case TYPE_CODE_PTR: | |
184 | case TYPE_CODE_STRUCT: | |
185 | case TYPE_CODE_UNION: | |
186 | case TYPE_CODE_VOID: | |
187 | case TYPE_CODE_SET: | |
188 | case TYPE_CODE_RANGE: | |
189 | case TYPE_CODE_STRING: | |
190 | case TYPE_CODE_BITSTRING: | |
191 | case TYPE_CODE_ERROR: | |
0d5de010 DJ |
192 | case TYPE_CODE_MEMBERPTR: |
193 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
194 | case TYPE_CODE_METHOD: |
195 | case TYPE_CODE_COMPLEX: | |
196 | default: | |
197 | break; | |
198 | } | |
199 | ||
200 | return value_cast (type, arg); | |
201 | } | |
202 | ||
203 | /* Determine a function's address and its return type from its value. | |
204 | Calls error() if the function is not valid for calling. */ | |
205 | ||
a9fa03de | 206 | CORE_ADDR |
04714b91 AC |
207 | find_function_addr (struct value *function, struct type **retval_type) |
208 | { | |
df407dfe | 209 | struct type *ftype = check_typedef (value_type (function)); |
52f0bd74 | 210 | enum type_code code = TYPE_CODE (ftype); |
7788af6d | 211 | struct type *value_type = NULL; |
04714b91 AC |
212 | CORE_ADDR funaddr; |
213 | ||
214 | /* If it's a member function, just look at the function | |
215 | part of it. */ | |
216 | ||
217 | /* Determine address to call. */ | |
218 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) | |
219 | { | |
220 | funaddr = VALUE_ADDRESS (function); | |
221 | value_type = TYPE_TARGET_TYPE (ftype); | |
222 | } | |
223 | else if (code == TYPE_CODE_PTR) | |
224 | { | |
225 | funaddr = value_as_address (function); | |
226 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
227 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
228 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
229 | { | |
e2d0e7eb AC |
230 | funaddr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
231 | funaddr, | |
232 | ¤t_target); | |
04714b91 AC |
233 | value_type = TYPE_TARGET_TYPE (ftype); |
234 | } | |
04714b91 AC |
235 | } |
236 | else if (code == TYPE_CODE_INT) | |
237 | { | |
238 | /* Handle the case of functions lacking debugging info. | |
239 | Their values are characters since their addresses are char */ | |
240 | if (TYPE_LENGTH (ftype) == 1) | |
241 | funaddr = value_as_address (value_addr (function)); | |
242 | else | |
2bbe3cc1 DJ |
243 | { |
244 | /* Handle function descriptors lacking debug info. */ | |
245 | int found_descriptor = 0; | |
246 | if (VALUE_LVAL (function) == lval_memory) | |
247 | { | |
248 | CORE_ADDR nfunaddr; | |
249 | funaddr = value_as_address (value_addr (function)); | |
250 | nfunaddr = funaddr; | |
251 | funaddr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, | |
252 | funaddr, | |
253 | ¤t_target); | |
254 | if (funaddr != nfunaddr) | |
255 | found_descriptor = 1; | |
256 | } | |
257 | if (!found_descriptor) | |
258 | /* Handle integer used as address of a function. */ | |
259 | funaddr = (CORE_ADDR) value_as_long (function); | |
260 | } | |
04714b91 AC |
261 | } |
262 | else | |
8a3fe4f8 | 263 | error (_("Invalid data type for function to be called.")); |
04714b91 | 264 | |
7d9b040b RC |
265 | if (retval_type != NULL) |
266 | *retval_type = value_type; | |
cbf3b44a | 267 | return funaddr + gdbarch_deprecated_function_start_offset (current_gdbarch); |
04714b91 AC |
268 | } |
269 | ||
d3712828 AC |
270 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
271 | function returns to. */ | |
7043d8dc AC |
272 | |
273 | static CORE_ADDR | |
274 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 275 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
276 | struct value **args, int nargs, |
277 | struct type *value_type, | |
e4fd649a UW |
278 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
279 | struct regcache *regcache) | |
7043d8dc | 280 | { |
50a834af MK |
281 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
282 | ||
283 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
284 | args, nargs, value_type, real_pc, bp_addr, | |
285 | regcache); | |
7043d8dc AC |
286 | } |
287 | ||
b89667eb DE |
288 | /* Fetch the name of the function at FUNADDR. |
289 | This is used in printing an error message for call_function_by_hand. | |
290 | BUF is used to print FUNADDR in hex if the function name cannot be | |
291 | determined. It must be large enough to hold formatted result of | |
292 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
293 | ||
294 | static const char * | |
295 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
296 | { | |
297 | { | |
298 | struct symbol *symbol = find_pc_function (funaddr); | |
299 | if (symbol) | |
300 | return SYMBOL_PRINT_NAME (symbol); | |
301 | } | |
302 | ||
303 | { | |
304 | /* Try the minimal symbols. */ | |
305 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); | |
306 | if (msymbol) | |
307 | return SYMBOL_PRINT_NAME (msymbol); | |
308 | } | |
309 | ||
310 | { | |
311 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
312 | hex_string (funaddr)); | |
313 | gdb_assert (strlen (tmp) + 1 <= buf_size); | |
314 | strcpy (buf, tmp); | |
315 | xfree (tmp); | |
316 | return buf; | |
317 | } | |
318 | } | |
319 | ||
320 | /* Subroutine of call_function_by_hand to simplify it. | |
321 | Start up the inferior and wait for it to stop. | |
322 | Return the exception if there's an error, or an exception with | |
323 | reason >= 0 if there's no error. | |
324 | ||
325 | This is done inside a TRY_CATCH so the caller needn't worry about | |
326 | thrown errors. The caller should rethrow if there's an error. */ | |
327 | ||
328 | static struct gdb_exception | |
329 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
330 | { | |
331 | volatile struct gdb_exception e; | |
332 | int saved_async = 0; | |
333 | int saved_suppress_resume_observer = suppress_resume_observer; | |
334 | int saved_suppress_stop_observer = suppress_stop_observer; | |
335 | ptid_t call_thread_ptid = call_thread->ptid; | |
336 | char *saved_target_shortname = xstrdup (target_shortname); | |
337 | ||
338 | clear_proceed_status (); | |
339 | ||
340 | disable_watchpoints_before_interactive_call_start (); | |
341 | call_thread->proceed_to_finish = 1; /* We want stop_registers, please... */ | |
342 | ||
343 | if (target_can_async_p ()) | |
344 | saved_async = target_async_mask (0); | |
345 | ||
346 | suppress_resume_observer = 1; | |
347 | suppress_stop_observer = 1; | |
348 | ||
349 | TRY_CATCH (e, RETURN_MASK_ALL) | |
350 | proceed (real_pc, TARGET_SIGNAL_0, 0); | |
351 | ||
352 | /* At this point the current thread may have changed. | |
353 | CALL_THREAD is no longer usable as its thread may have exited. | |
354 | Set it to NULL to prevent its further use. */ | |
355 | call_thread = NULL; | |
356 | ||
357 | suppress_resume_observer = saved_suppress_resume_observer; | |
358 | suppress_stop_observer = saved_suppress_stop_observer; | |
359 | ||
360 | /* Don't restore the async mask if the target has changed, | |
361 | saved_async is for the original target. */ | |
362 | if (saved_async | |
363 | && strcmp (saved_target_shortname, target_shortname) == 0) | |
364 | target_async_mask (saved_async); | |
365 | ||
366 | enable_watchpoints_after_interactive_call_stop (); | |
367 | ||
368 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
369 | of inferior call thread. | |
370 | If all error()s out of proceed ended up calling normal_stop | |
371 | (and perhaps they should; it already does in the special case | |
372 | of error out of resume()), then we wouldn't need this. */ | |
373 | if (e.reason < 0) | |
374 | { | |
375 | struct thread_info *tp = find_thread_pid (call_thread_ptid); | |
376 | if (tp != NULL) | |
377 | breakpoint_auto_delete (tp->stop_bpstat); | |
378 | } | |
379 | ||
380 | xfree (saved_target_shortname); | |
381 | ||
382 | return e; | |
383 | } | |
384 | ||
04714b91 AC |
385 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
386 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
387 | frame which looks just like a real frame is so that if you call a | |
388 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
389 | will look right. Whether the backtrace needs to actually show the | |
390 | stack at the time the inferior function was called is debatable, but | |
391 | it certainly needs to not display garbage. So if you are contemplating | |
392 | making dummy frames be different from normal frames, consider that. */ | |
393 | ||
394 | /* Perform a function call in the inferior. | |
395 | ARGS is a vector of values of arguments (NARGS of them). | |
396 | FUNCTION is a value, the function to be called. | |
397 | Returns a value representing what the function returned. | |
398 | May fail to return, if a breakpoint or signal is hit | |
399 | during the execution of the function. | |
400 | ||
401 | ARGS is modified to contain coerced values. */ | |
402 | ||
403 | struct value * | |
404 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
405 | { | |
52f0bd74 | 406 | CORE_ADDR sp; |
41f1b697 DJ |
407 | struct type *values_type, *target_values_type; |
408 | unsigned char struct_return = 0, lang_struct_return = 0; | |
04714b91 | 409 | CORE_ADDR struct_addr = 0; |
04714b91 AC |
410 | struct inferior_status *inf_status; |
411 | struct cleanup *inf_status_cleanup; | |
b89667eb DE |
412 | struct inferior_thread_state *caller_state; |
413 | struct cleanup *caller_state_cleanup; | |
04714b91 | 414 | CORE_ADDR funaddr; |
04714b91 | 415 | CORE_ADDR real_pc; |
df407dfe | 416 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 417 | CORE_ADDR bp_addr; |
96860204 | 418 | struct frame_id dummy_id; |
41f1b697 | 419 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
420 | struct frame_info *frame; |
421 | struct gdbarch *gdbarch; | |
b89667eb DE |
422 | ptid_t call_thread_ptid; |
423 | struct gdb_exception e; | |
424 | const char *name; | |
425 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; | |
04714b91 | 426 | |
4c850810 DJ |
427 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
428 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
429 | ||
04714b91 AC |
430 | if (!target_has_execution) |
431 | noprocess (); | |
432 | ||
0b9dfe2b MD |
433 | frame = get_current_frame (); |
434 | gdbarch = get_frame_arch (frame); | |
435 | ||
436 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 437 | error (_("This target does not support function calls.")); |
a86c5fc9 | 438 | |
b89667eb DE |
439 | /* A cleanup for the inferior status. |
440 | This is only needed while we're preparing the inferior function call. */ | |
441 | inf_status = save_inferior_status (); | |
04714b91 AC |
442 | inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status); |
443 | ||
b89667eb DE |
444 | /* Save the caller's registers and other state associated with the |
445 | inferior itself so that they can be restored once the | |
96860204 AC |
446 | callee returns. To allow nested calls the registers are (further |
447 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
448 | is tossed once the regcache has been pushed). */ | |
b89667eb DE |
449 | caller_state = save_inferior_thread_state (); |
450 | caller_state_cleanup = make_cleanup_restore_inferior_thread_state (caller_state); | |
04714b91 | 451 | |
04714b91 | 452 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 453 | { |
0b9dfe2b MD |
454 | CORE_ADDR old_sp = get_frame_sp (frame); |
455 | if (gdbarch_frame_align_p (gdbarch)) | |
ebc7896c | 456 | { |
0b9dfe2b | 457 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
458 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
459 | ABIs, a function can use memory beyond the inner most stack | |
460 | address. AMD64 called that region the "red zone". Skip at | |
461 | least the "red zone" size before allocating any space on | |
462 | the stack. */ | |
0b9dfe2b MD |
463 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
464 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 465 | else |
0b9dfe2b | 466 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 467 | /* Still aligned? */ |
0b9dfe2b | 468 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
469 | /* NOTE: cagney/2002-09-18: |
470 | ||
471 | On a RISC architecture, a void parameterless generic dummy | |
472 | frame (i.e., no parameters, no result) typically does not | |
473 | need to push anything the stack and hence can leave SP and | |
c48a845b | 474 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
475 | not push anything on the stack and, hence, that too can |
476 | leave FP and SP unchanged. As a consequence, a sequence of | |
477 | void parameterless generic dummy frame calls to frameless | |
478 | functions will create a sequence of effectively identical | |
479 | frames (SP, FP and TOS and PC the same). This, not | |
480 | suprisingly, results in what appears to be a stack in an | |
481 | infinite loop --- when GDB tries to find a generic dummy | |
482 | frame on the internal dummy frame stack, it will always | |
483 | find the first one. | |
484 | ||
485 | To avoid this problem, the code below always grows the | |
486 | stack. That way, two dummy frames can never be identical. | |
487 | It does burn a few bytes of stack but that is a small price | |
488 | to pay :-). */ | |
ebc7896c AC |
489 | if (sp == old_sp) |
490 | { | |
0b9dfe2b | 491 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 492 | /* Stack grows down. */ |
0b9dfe2b | 493 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
494 | else |
495 | /* Stack grows up. */ | |
0b9dfe2b | 496 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 497 | } |
0b9dfe2b | 498 | gdb_assert ((gdbarch_inner_than (gdbarch, 1, 2) |
4d1e7dd1 | 499 | && sp <= old_sp) |
0b9dfe2b | 500 | || (gdbarch_inner_than (gdbarch, 2, 1) |
4d1e7dd1 | 501 | && sp >= old_sp)); |
ebc7896c AC |
502 | } |
503 | else | |
a59fe496 AC |
504 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
505 | ||
8b148df9 AC |
506 | Who knows how badly aligned the SP is! |
507 | ||
508 | If the generic dummy frame ends up empty (because nothing is | |
509 | pushed) GDB won't be able to correctly perform back traces. | |
510 | If a target is having trouble with backtraces, first thing to | |
511 | do is add FRAME_ALIGN() to the architecture vector. If that | |
669fac23 | 512 | fails, try dummy_id(). |
8b148df9 AC |
513 | |
514 | If the ABI specifies a "Red Zone" (see the doco) the code | |
515 | below will quietly trash it. */ | |
ebc7896c AC |
516 | sp = old_sp; |
517 | } | |
04714b91 | 518 | |
df407dfe | 519 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
520 | if (!values_type) |
521 | values_type = builtin_type (gdbarch)->builtin_int; | |
522 | ||
df407dfe | 523 | CHECK_TYPEDEF (values_type); |
04714b91 | 524 | |
41f1b697 DJ |
525 | /* Are we returning a value using a structure return (passing a |
526 | hidden argument pointing to storage) or a normal value return? | |
527 | There are two cases: language-mandated structure return and | |
528 | target ABI structure return. The variable STRUCT_RETURN only | |
529 | describes the latter. The language version is handled by passing | |
530 | the return location as the first parameter to the function, | |
531 | even preceding "this". This is different from the target | |
532 | ABI version, which is target-specific; for instance, on ia64 | |
533 | the first argument is passed in out0 but the hidden structure | |
534 | return pointer would normally be passed in r8. */ | |
535 | ||
536 | if (language_pass_by_reference (values_type)) | |
537 | { | |
538 | lang_struct_return = 1; | |
04714b91 | 539 | |
41f1b697 DJ |
540 | /* Tell the target specific argument pushing routine not to |
541 | expect a value. */ | |
542 | target_values_type = builtin_type_void; | |
543 | } | |
544 | else | |
545 | { | |
c055b101 | 546 | struct_return = using_struct_return (value_type (function), values_type); |
41f1b697 DJ |
547 | target_values_type = values_type; |
548 | } | |
04714b91 | 549 | |
7043d8dc AC |
550 | /* Determine the location of the breakpoint (and possibly other |
551 | stuff) that the called function will return to. The SPARC, for a | |
552 | function returning a structure or union, needs to make space for | |
553 | not just the breakpoint but also an extra word containing the | |
554 | size (?) of the structure being passed. */ | |
555 | ||
556 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there | |
557 | is no need to write that out. */ | |
558 | ||
0b9dfe2b | 559 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
560 | { |
561 | case ON_STACK: | |
3b676233 | 562 | sp = push_dummy_code (gdbarch, sp, funaddr, |
82585c72 | 563 | args, nargs, target_values_type, |
594f7785 | 564 | &real_pc, &bp_addr, get_current_regcache ()); |
7043d8dc | 565 | break; |
04714b91 | 566 | case AT_ENTRY_POINT: |
3b676233 DE |
567 | { |
568 | CORE_ADDR dummy_addr; | |
569 | ||
570 | real_pc = funaddr; | |
571 | dummy_addr = entry_point_address (); | |
572 | /* Make certain that the address points at real code, and not a | |
573 | function descriptor. */ | |
574 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
575 | dummy_addr, | |
576 | ¤t_target); | |
577 | /* A call dummy always consists of just a single breakpoint, so | |
578 | its address is the same as the address of the dummy. */ | |
579 | bp_addr = dummy_addr; | |
580 | break; | |
581 | } | |
9710e734 AC |
582 | case AT_SYMBOL: |
583 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose | |
584 | address is the location where the breakpoint should be | |
585 | placed. Once all targets are using the overhauled frame code | |
586 | this can be deleted - ON_STACK is a better option. */ | |
587 | { | |
588 | struct minimal_symbol *sym; | |
3b676233 | 589 | CORE_ADDR dummy_addr; |
9710e734 AC |
590 | |
591 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); | |
592 | real_pc = funaddr; | |
593 | if (sym) | |
594 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); | |
595 | else | |
596 | dummy_addr = entry_point_address (); | |
0285512f AC |
597 | /* Make certain that the address points at real code, and not |
598 | a function descriptor. */ | |
0b9dfe2b | 599 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, |
e2d0e7eb AC |
600 | dummy_addr, |
601 | ¤t_target); | |
0285512f AC |
602 | /* A call dummy always consists of just a single breakpoint, |
603 | so it's address is the same as the address of the dummy. */ | |
9710e734 AC |
604 | bp_addr = dummy_addr; |
605 | break; | |
606 | } | |
04714b91 | 607 | default: |
e2e0b3e5 | 608 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
609 | } |
610 | ||
04714b91 | 611 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 612 | error (_("Too few arguments in function call.")); |
04714b91 | 613 | |
ebc7896c AC |
614 | { |
615 | int i; | |
616 | for (i = nargs - 1; i >= 0; i--) | |
617 | { | |
618 | int prototyped; | |
619 | struct type *param_type; | |
620 | ||
621 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
622 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
623 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
624 | prototyped = 1; | |
625 | else if (i < TYPE_NFIELDS (ftype)) | |
626 | prototyped = TYPE_PROTOTYPED (ftype); | |
627 | else | |
628 | prototyped = 0; | |
629 | ||
630 | if (i < TYPE_NFIELDS (ftype)) | |
631 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
632 | else | |
633 | param_type = NULL; | |
41f1b697 | 634 | |
7788af6d UW |
635 | args[i] = value_arg_coerce (gdbarch, args[i], |
636 | param_type, prototyped, &sp); | |
ebc7896c | 637 | |
41f1b697 DJ |
638 | if (param_type != NULL && language_pass_by_reference (param_type)) |
639 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
640 | } |
641 | } | |
04714b91 | 642 | |
04714b91 AC |
643 | /* Reserve space for the return structure to be written on the |
644 | stack, if necessary. Make certain that the value is correctly | |
645 | aligned. */ | |
646 | ||
41f1b697 | 647 | if (struct_return || lang_struct_return) |
04714b91 | 648 | { |
df407dfe | 649 | int len = TYPE_LENGTH (values_type); |
0b9dfe2b | 650 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
651 | { |
652 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
653 | making space for the return value. */ | |
654 | sp -= len; | |
0b9dfe2b MD |
655 | if (gdbarch_frame_align_p (gdbarch)) |
656 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
657 | struct_addr = sp; |
658 | } | |
659 | else | |
660 | { | |
661 | /* Stack grows upward. Align the frame, allocate space, and | |
662 | then again, re-align the frame??? */ | |
0b9dfe2b MD |
663 | if (gdbarch_frame_align_p (gdbarch)) |
664 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
665 | struct_addr = sp; |
666 | sp += len; | |
0b9dfe2b MD |
667 | if (gdbarch_frame_align_p (gdbarch)) |
668 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
669 | } |
670 | } | |
671 | ||
41f1b697 DJ |
672 | if (lang_struct_return) |
673 | { | |
674 | struct value **new_args; | |
675 | ||
676 | /* Add the new argument to the front of the argument list. */ | |
677 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
678 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
679 | struct_addr); | |
680 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
681 | args = new_args; | |
682 | nargs++; | |
683 | args_cleanup = make_cleanup (xfree, args); | |
684 | } | |
685 | else | |
686 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
687 | ||
04714b91 AC |
688 | /* Create the dummy stack frame. Pass in the call dummy address as, |
689 | presumably, the ABI code knows where, in the call dummy, the | |
690 | return address should be pointed. */ | |
0b9dfe2b MD |
691 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
692 | bp_addr, nargs, args, | |
594f7785 | 693 | sp, struct_return, struct_addr); |
04714b91 | 694 | |
41f1b697 DJ |
695 | do_cleanups (args_cleanup); |
696 | ||
96860204 AC |
697 | /* Set up a frame ID for the dummy frame so we can pass it to |
698 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
699 | ID so that the breakpoint code can correctly re-identify the | |
700 | dummy breakpoint. */ | |
8241eaa6 | 701 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 702 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 703 | the frame ID's stack address. */ |
96860204 | 704 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 705 | |
74cfe982 AC |
706 | /* Create a momentary breakpoint at the return address of the |
707 | inferior. That way it breaks when it returns. */ | |
04714b91 | 708 | |
74cfe982 AC |
709 | { |
710 | struct breakpoint *bpt; | |
711 | struct symtab_and_line sal; | |
74cfe982 AC |
712 | init_sal (&sal); /* initialize to zeroes */ |
713 | sal.pc = bp_addr; | |
714 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
715 | /* Sanity. The exact same SP value is returned by |
716 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 717 | dummy_id to form the frame ID's stack address. */ |
96860204 | 718 | bpt = set_momentary_breakpoint (sal, dummy_id, bp_call_dummy); |
74cfe982 AC |
719 | bpt->disposition = disp_del; |
720 | } | |
04714b91 | 721 | |
96860204 AC |
722 | /* Everything's ready, push all the info needed to restore the |
723 | caller (and identify the dummy-frame) onto the dummy-frame | |
724 | stack. */ | |
b89667eb DE |
725 | dummy_frame_push (caller_state, &dummy_id); |
726 | ||
727 | /* Discard both inf_status and caller_state cleanups. | |
728 | From this point on we explicitly restore the associated state | |
729 | or discard it. */ | |
730 | discard_cleanups (inf_status_cleanup); | |
96860204 AC |
731 | |
732 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - | |
733 | If you're looking to implement asynchronous dummy-frames, then | |
734 | just below is the place to chop this function in two.. */ | |
735 | ||
b89667eb DE |
736 | /* TP is invalid after run_inferior_call returns, so enclose this |
737 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 738 | { |
32400beb | 739 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 740 | |
b89667eb DE |
741 | /* Save this thread's ptid, we need it later but the thread |
742 | may have exited. */ | |
743 | call_thread_ptid = tp->ptid; | |
74cfe982 | 744 | |
b89667eb | 745 | /* Run the inferior until it stops. */ |
f5871ec0 | 746 | |
b89667eb | 747 | e = run_inferior_call (tp, real_pc); |
52557533 | 748 | } |
04714b91 | 749 | |
b89667eb DE |
750 | /* Rethrow an error if we got one trying to run the inferior. */ |
751 | ||
752 | if (e.reason < 0) | |
753 | { | |
754 | const char *name = get_function_name (funaddr, | |
755 | name_buf, sizeof (name_buf)); | |
756 | ||
757 | discard_inferior_status (inf_status); | |
758 | ||
759 | /* We could discard the dummy frame here if the program exited, | |
760 | but it will get garbage collected the next time the program is | |
761 | run anyway. */ | |
762 | ||
763 | switch (e.reason) | |
764 | { | |
765 | case RETURN_ERROR: | |
766 | throw_error (e.error, _("\ | |
767 | %s\n\ | |
768 | An error occurred while in a function called from GDB.\n\ | |
769 | Evaluation of the expression containing the function\n\ | |
770 | (%s) will be abandoned.\n\ | |
771 | When the function is done executing, GDB will silently stop."), | |
772 | e.message, name); | |
773 | case RETURN_QUIT: | |
774 | default: | |
775 | throw_exception (e); | |
776 | } | |
777 | } | |
778 | ||
779 | /* If the program has exited, or we stopped at a different thread, | |
780 | exit and inform the user. */ | |
781 | ||
de04a248 DE |
782 | if (! target_has_execution) |
783 | { | |
b89667eb DE |
784 | const char *name = get_function_name (funaddr, |
785 | name_buf, sizeof (name_buf)); | |
786 | ||
787 | /* If we try to restore the inferior status, | |
de04a248 | 788 | we'll crash as the inferior is no longer running. */ |
de04a248 | 789 | discard_inferior_status (inf_status); |
b89667eb DE |
790 | |
791 | /* We could discard the dummy frame here given that the program exited, | |
792 | but it will get garbage collected the next time the program is | |
793 | run anyway. */ | |
794 | ||
de04a248 | 795 | error (_("\ |
b89667eb DE |
796 | The program being debugged exited while in a function called from GDB.\n\ |
797 | Evaluation of the expression containing the function\n\ | |
798 | (%s) will be abandoned."), | |
799 | name); | |
800 | } | |
801 | ||
802 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
803 | { | |
804 | const char *name = get_function_name (funaddr, | |
805 | name_buf, sizeof (name_buf)); | |
806 | ||
807 | /* We've switched threads. This can happen if another thread gets a | |
808 | signal or breakpoint while our thread was running. | |
809 | There's no point in restoring the inferior status, | |
810 | we're in a different thread. */ | |
811 | discard_inferior_status (inf_status); | |
812 | /* Keep the dummy frame record, if the user switches back to the | |
813 | thread with the hand-call, we'll need it. */ | |
814 | if (stopped_by_random_signal) | |
815 | error (_("\ | |
816 | The program received a signal in another thread while\n\ | |
817 | making a function call from GDB.\n\ | |
818 | Evaluation of the expression containing the function\n\ | |
819 | (%s) will be abandoned.\n\ | |
820 | When the function is done executing, GDB will silently stop."), | |
821 | name); | |
822 | else | |
823 | error (_("\ | |
824 | The program stopped in another thread while making a function call from GDB.\n\ | |
825 | Evaluation of the expression containing the function\n\ | |
826 | (%s) will be abandoned.\n\ | |
827 | When the function is done executing, GDB will silently stop."), | |
828 | name); | |
de04a248 DE |
829 | } |
830 | ||
52557533 AC |
831 | if (stopped_by_random_signal || !stop_stack_dummy) |
832 | { | |
b89667eb DE |
833 | const char *name = get_function_name (funaddr, |
834 | name_buf, sizeof (name_buf)); | |
835 | ||
52557533 AC |
836 | if (stopped_by_random_signal) |
837 | { | |
838 | /* We stopped inside the FUNCTION because of a random | |
839 | signal. Further execution of the FUNCTION is not | |
840 | allowed. */ | |
04714b91 | 841 | |
52557533 AC |
842 | if (unwind_on_signal_p) |
843 | { | |
844 | /* The user wants the context restored. */ | |
845 | ||
846 | /* We must get back to the frame we were before the | |
b89667eb DE |
847 | dummy call. */ |
848 | dummy_frame_pop (dummy_id); | |
849 | ||
850 | /* We also need to restore inferior status to that before the | |
851 | dummy call. */ | |
852 | restore_inferior_status (inf_status); | |
04714b91 | 853 | |
52557533 AC |
854 | /* FIXME: Insert a bunch of wrap_here; name can be very |
855 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 856 | error (_("\ |
04714b91 AC |
857 | The program being debugged was signaled while in a function called from GDB.\n\ |
858 | GDB has restored the context to what it was before the call.\n\ | |
2e74121d | 859 | To change this behavior use \"set unwindonsignal off\".\n\ |
b89667eb DE |
860 | Evaluation of the expression containing the function\n\ |
861 | (%s) will be abandoned."), | |
52557533 AC |
862 | name); |
863 | } | |
864 | else | |
865 | { | |
866 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
867 | (default). |
868 | Discard inferior status, we're not at the same point | |
869 | we started at. */ | |
52557533 | 870 | discard_inferior_status (inf_status); |
b89667eb | 871 | |
52557533 AC |
872 | /* FIXME: Insert a bunch of wrap_here; name can be very |
873 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 874 | error (_("\ |
04714b91 AC |
875 | The program being debugged was signaled while in a function called from GDB.\n\ |
876 | GDB remains in the frame where the signal was received.\n\ | |
2e74121d | 877 | To change this behavior use \"set unwindonsignal on\".\n\ |
b89667eb DE |
878 | Evaluation of the expression containing the function\n\ |
879 | (%s) will be abandoned.\n\ | |
880 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
881 | name); |
882 | } | |
883 | } | |
04714b91 | 884 | |
52557533 AC |
885 | if (!stop_stack_dummy) |
886 | { | |
b89667eb DE |
887 | /* We hit a breakpoint inside the FUNCTION. |
888 | Keep the dummy frame, the user may want to examine its state. | |
889 | Discard inferior status, we're not at the same point | |
890 | we started at. */ | |
52557533 | 891 | discard_inferior_status (inf_status); |
b89667eb | 892 | |
52557533 AC |
893 | /* The following error message used to say "The expression |
894 | which contained the function call has been discarded." | |
895 | It is a hard concept to explain in a few words. Ideally, | |
896 | GDB would be able to resume evaluation of the expression | |
897 | when the function finally is done executing. Perhaps | |
898 | someday this will be implemented (it would not be easy). */ | |
899 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
900 | a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 901 | error (_("\ |
04714b91 | 902 | The program being debugged stopped while in a function called from GDB.\n\ |
b89667eb DE |
903 | Evaluation of the expression containing the function\n\ |
904 | (%s) will be abandoned.\n\ | |
905 | When the function is done executing, GDB will silently stop."), | |
906 | name); | |
52557533 AC |
907 | } |
908 | ||
909 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 910 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 911 | } |
04714b91 | 912 | |
b89667eb DE |
913 | /* If we get here the called FUNCTION ran to completion, |
914 | and the dummy frame has already been popped. */ | |
74cfe982 | 915 | |
44e5158b | 916 | { |
b89667eb DE |
917 | struct regcache *retbuf = regcache_xmalloc (gdbarch); |
918 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); | |
1a4d7a36 MK |
919 | struct value *retval = NULL; |
920 | ||
b89667eb DE |
921 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
922 | ||
923 | /* Inferior call is successful. Restore the inferior status. | |
924 | At this stage, leave the RETBUF alone. */ | |
925 | restore_inferior_status (inf_status); | |
926 | ||
927 | /* Figure out the value returned by the function. */ | |
928 | ||
41f1b697 DJ |
929 | if (lang_struct_return) |
930 | retval = value_at (values_type, struct_addr); | |
931 | else if (TYPE_CODE (target_values_type) == TYPE_CODE_VOID) | |
44e5158b | 932 | { |
1a4d7a36 MK |
933 | /* If the function returns void, don't bother fetching the |
934 | return value. */ | |
df407dfe | 935 | retval = allocate_value (values_type); |
44e5158b | 936 | } |
1a4d7a36 MK |
937 | else |
938 | { | |
c055b101 CV |
939 | switch (gdbarch_return_value (gdbarch, value_type (function), |
940 | target_values_type, NULL, NULL, NULL)) | |
1a4d7a36 MK |
941 | { |
942 | case RETURN_VALUE_REGISTER_CONVENTION: | |
943 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: | |
944 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: | |
945 | retval = allocate_value (values_type); | |
c055b101 CV |
946 | gdbarch_return_value (gdbarch, value_type (function), values_type, |
947 | retbuf, value_contents_raw (retval), NULL); | |
1a4d7a36 MK |
948 | break; |
949 | case RETURN_VALUE_STRUCT_CONVENTION: | |
950 | retval = value_at (values_type, struct_addr); | |
951 | break; | |
952 | } | |
953 | } | |
954 | ||
44e5158b | 955 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 956 | |
b89667eb | 957 | gdb_assert (retval); |
44e5158b AC |
958 | return retval; |
959 | } | |
04714b91 | 960 | } |
1a4d7a36 | 961 | \f |
04714b91 | 962 | |
1a4d7a36 | 963 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
964 | void _initialize_infcall (void); |
965 | ||
966 | void | |
967 | _initialize_infcall (void) | |
968 | { | |
969 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
970 | &coerce_float_to_double_p, _("\ |
971 | Set coercion of floats to doubles when calling functions."), _("\ | |
972 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
973 | Variables of type float should generally be converted to doubles before\n\ |
974 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
975 | function. However, some older debug info formats do not provide enough\n\ | |
976 | information to determine that a function is prototyped. If this flag is\n\ | |
977 | set, GDB will perform the conversion for a function it considers\n\ | |
978 | unprototyped.\n\ | |
7915a72c | 979 | The default is to perform the conversion.\n"), |
2c5b56ce | 980 | NULL, |
920d2a44 | 981 | show_coerce_float_to_double_p, |
2c5b56ce | 982 | &setlist, &showlist); |
04714b91 AC |
983 | |
984 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
985 | &unwind_on_signal_p, _("\ |
986 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
987 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
988 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
989 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
990 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 991 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 992 | NULL, |
920d2a44 | 993 | show_unwind_on_signal_p, |
2c5b56ce | 994 | &setlist, &showlist); |
04714b91 | 995 | } |