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; | |
87bc73ea | 246 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
247 | if (VALUE_LVAL (function) == lval_memory) |
248 | { | |
249 | CORE_ADDR nfunaddr; | |
250 | funaddr = value_as_address (value_addr (function)); | |
251 | nfunaddr = funaddr; | |
252 | funaddr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, | |
253 | funaddr, | |
254 | ¤t_target); | |
255 | if (funaddr != nfunaddr) | |
256 | found_descriptor = 1; | |
257 | } | |
258 | if (!found_descriptor) | |
259 | /* Handle integer used as address of a function. */ | |
260 | funaddr = (CORE_ADDR) value_as_long (function); | |
261 | } | |
04714b91 AC |
262 | } |
263 | else | |
8a3fe4f8 | 264 | error (_("Invalid data type for function to be called.")); |
04714b91 | 265 | |
7d9b040b RC |
266 | if (retval_type != NULL) |
267 | *retval_type = value_type; | |
cbf3b44a | 268 | return funaddr + gdbarch_deprecated_function_start_offset (current_gdbarch); |
04714b91 AC |
269 | } |
270 | ||
d3712828 AC |
271 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
272 | function returns to. */ | |
7043d8dc AC |
273 | |
274 | static CORE_ADDR | |
275 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 276 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
277 | struct value **args, int nargs, |
278 | struct type *value_type, | |
e4fd649a UW |
279 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
280 | struct regcache *regcache) | |
7043d8dc | 281 | { |
50a834af MK |
282 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
283 | ||
284 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
285 | args, nargs, value_type, real_pc, bp_addr, | |
286 | regcache); | |
7043d8dc AC |
287 | } |
288 | ||
b89667eb DE |
289 | /* Fetch the name of the function at FUNADDR. |
290 | This is used in printing an error message for call_function_by_hand. | |
291 | BUF is used to print FUNADDR in hex if the function name cannot be | |
292 | determined. It must be large enough to hold formatted result of | |
293 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
294 | ||
295 | static const char * | |
296 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
297 | { | |
298 | { | |
299 | struct symbol *symbol = find_pc_function (funaddr); | |
300 | if (symbol) | |
301 | return SYMBOL_PRINT_NAME (symbol); | |
302 | } | |
303 | ||
304 | { | |
305 | /* Try the minimal symbols. */ | |
306 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); | |
307 | if (msymbol) | |
308 | return SYMBOL_PRINT_NAME (msymbol); | |
309 | } | |
310 | ||
311 | { | |
312 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
313 | hex_string (funaddr)); | |
314 | gdb_assert (strlen (tmp) + 1 <= buf_size); | |
315 | strcpy (buf, tmp); | |
316 | xfree (tmp); | |
317 | return buf; | |
318 | } | |
319 | } | |
320 | ||
321 | /* Subroutine of call_function_by_hand to simplify it. | |
322 | Start up the inferior and wait for it to stop. | |
323 | Return the exception if there's an error, or an exception with | |
324 | reason >= 0 if there's no error. | |
325 | ||
326 | This is done inside a TRY_CATCH so the caller needn't worry about | |
327 | thrown errors. The caller should rethrow if there's an error. */ | |
328 | ||
329 | static struct gdb_exception | |
330 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
331 | { | |
332 | volatile struct gdb_exception e; | |
333 | int saved_async = 0; | |
c5a4d20b | 334 | int saved_in_infcall = call_thread->in_infcall; |
b89667eb DE |
335 | ptid_t call_thread_ptid = call_thread->ptid; |
336 | char *saved_target_shortname = xstrdup (target_shortname); | |
337 | ||
c5a4d20b PA |
338 | call_thread->in_infcall = 1; |
339 | ||
b89667eb DE |
340 | clear_proceed_status (); |
341 | ||
342 | disable_watchpoints_before_interactive_call_start (); | |
343 | call_thread->proceed_to_finish = 1; /* We want stop_registers, please... */ | |
344 | ||
345 | if (target_can_async_p ()) | |
346 | saved_async = target_async_mask (0); | |
347 | ||
b89667eb DE |
348 | TRY_CATCH (e, RETURN_MASK_ALL) |
349 | proceed (real_pc, TARGET_SIGNAL_0, 0); | |
350 | ||
c5a4d20b PA |
351 | /* At this point the current thread may have changed. Refresh |
352 | CALL_THREAD as it could be invalid if its thread has exited. */ | |
353 | call_thread = find_thread_pid (call_thread_ptid); | |
b89667eb DE |
354 | |
355 | /* Don't restore the async mask if the target has changed, | |
356 | saved_async is for the original target. */ | |
357 | if (saved_async | |
358 | && strcmp (saved_target_shortname, target_shortname) == 0) | |
359 | target_async_mask (saved_async); | |
360 | ||
361 | enable_watchpoints_after_interactive_call_stop (); | |
362 | ||
363 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
364 | of inferior call thread. | |
365 | If all error()s out of proceed ended up calling normal_stop | |
366 | (and perhaps they should; it already does in the special case | |
367 | of error out of resume()), then we wouldn't need this. */ | |
368 | if (e.reason < 0) | |
369 | { | |
c5a4d20b PA |
370 | if (call_thread != NULL) |
371 | breakpoint_auto_delete (call_thread->stop_bpstat); | |
b89667eb DE |
372 | } |
373 | ||
c5a4d20b PA |
374 | if (call_thread != NULL) |
375 | call_thread->in_infcall = saved_in_infcall; | |
376 | ||
b89667eb DE |
377 | xfree (saved_target_shortname); |
378 | ||
379 | return e; | |
380 | } | |
381 | ||
04714b91 AC |
382 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
383 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
384 | frame which looks just like a real frame is so that if you call a | |
385 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
386 | will look right. Whether the backtrace needs to actually show the | |
387 | stack at the time the inferior function was called is debatable, but | |
388 | it certainly needs to not display garbage. So if you are contemplating | |
389 | making dummy frames be different from normal frames, consider that. */ | |
390 | ||
391 | /* Perform a function call in the inferior. | |
392 | ARGS is a vector of values of arguments (NARGS of them). | |
393 | FUNCTION is a value, the function to be called. | |
394 | Returns a value representing what the function returned. | |
395 | May fail to return, if a breakpoint or signal is hit | |
396 | during the execution of the function. | |
397 | ||
398 | ARGS is modified to contain coerced values. */ | |
399 | ||
400 | struct value * | |
401 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
402 | { | |
52f0bd74 | 403 | CORE_ADDR sp; |
41f1b697 DJ |
404 | struct type *values_type, *target_values_type; |
405 | unsigned char struct_return = 0, lang_struct_return = 0; | |
04714b91 | 406 | CORE_ADDR struct_addr = 0; |
04714b91 AC |
407 | struct inferior_status *inf_status; |
408 | struct cleanup *inf_status_cleanup; | |
b89667eb DE |
409 | struct inferior_thread_state *caller_state; |
410 | struct cleanup *caller_state_cleanup; | |
04714b91 | 411 | CORE_ADDR funaddr; |
04714b91 | 412 | CORE_ADDR real_pc; |
df407dfe | 413 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 414 | CORE_ADDR bp_addr; |
96860204 | 415 | struct frame_id dummy_id; |
41f1b697 | 416 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
417 | struct frame_info *frame; |
418 | struct gdbarch *gdbarch; | |
b89667eb DE |
419 | ptid_t call_thread_ptid; |
420 | struct gdb_exception e; | |
421 | const char *name; | |
422 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; | |
04714b91 | 423 | |
4c850810 DJ |
424 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
425 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
426 | ||
04714b91 AC |
427 | if (!target_has_execution) |
428 | noprocess (); | |
429 | ||
0b9dfe2b MD |
430 | frame = get_current_frame (); |
431 | gdbarch = get_frame_arch (frame); | |
432 | ||
433 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 434 | error (_("This target does not support function calls.")); |
a86c5fc9 | 435 | |
b89667eb DE |
436 | /* A cleanup for the inferior status. |
437 | This is only needed while we're preparing the inferior function call. */ | |
438 | inf_status = save_inferior_status (); | |
04714b91 AC |
439 | inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status); |
440 | ||
b89667eb DE |
441 | /* Save the caller's registers and other state associated with the |
442 | inferior itself so that they can be restored once the | |
96860204 AC |
443 | callee returns. To allow nested calls the registers are (further |
444 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
445 | is tossed once the regcache has been pushed). */ | |
b89667eb DE |
446 | caller_state = save_inferior_thread_state (); |
447 | caller_state_cleanup = make_cleanup_restore_inferior_thread_state (caller_state); | |
04714b91 | 448 | |
04714b91 | 449 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 450 | { |
0b9dfe2b MD |
451 | CORE_ADDR old_sp = get_frame_sp (frame); |
452 | if (gdbarch_frame_align_p (gdbarch)) | |
ebc7896c | 453 | { |
0b9dfe2b | 454 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
455 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
456 | ABIs, a function can use memory beyond the inner most stack | |
457 | address. AMD64 called that region the "red zone". Skip at | |
458 | least the "red zone" size before allocating any space on | |
459 | the stack. */ | |
0b9dfe2b MD |
460 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
461 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 462 | else |
0b9dfe2b | 463 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 464 | /* Still aligned? */ |
0b9dfe2b | 465 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
466 | /* NOTE: cagney/2002-09-18: |
467 | ||
468 | On a RISC architecture, a void parameterless generic dummy | |
469 | frame (i.e., no parameters, no result) typically does not | |
470 | need to push anything the stack and hence can leave SP and | |
c48a845b | 471 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
472 | not push anything on the stack and, hence, that too can |
473 | leave FP and SP unchanged. As a consequence, a sequence of | |
474 | void parameterless generic dummy frame calls to frameless | |
475 | functions will create a sequence of effectively identical | |
476 | frames (SP, FP and TOS and PC the same). This, not | |
477 | suprisingly, results in what appears to be a stack in an | |
478 | infinite loop --- when GDB tries to find a generic dummy | |
479 | frame on the internal dummy frame stack, it will always | |
480 | find the first one. | |
481 | ||
482 | To avoid this problem, the code below always grows the | |
483 | stack. That way, two dummy frames can never be identical. | |
484 | It does burn a few bytes of stack but that is a small price | |
485 | to pay :-). */ | |
ebc7896c AC |
486 | if (sp == old_sp) |
487 | { | |
0b9dfe2b | 488 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 489 | /* Stack grows down. */ |
0b9dfe2b | 490 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
491 | else |
492 | /* Stack grows up. */ | |
0b9dfe2b | 493 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 494 | } |
0b9dfe2b | 495 | gdb_assert ((gdbarch_inner_than (gdbarch, 1, 2) |
4d1e7dd1 | 496 | && sp <= old_sp) |
0b9dfe2b | 497 | || (gdbarch_inner_than (gdbarch, 2, 1) |
4d1e7dd1 | 498 | && sp >= old_sp)); |
ebc7896c AC |
499 | } |
500 | else | |
a59fe496 AC |
501 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
502 | ||
8b148df9 AC |
503 | Who knows how badly aligned the SP is! |
504 | ||
505 | If the generic dummy frame ends up empty (because nothing is | |
506 | pushed) GDB won't be able to correctly perform back traces. | |
507 | If a target is having trouble with backtraces, first thing to | |
508 | do is add FRAME_ALIGN() to the architecture vector. If that | |
669fac23 | 509 | fails, try dummy_id(). |
8b148df9 AC |
510 | |
511 | If the ABI specifies a "Red Zone" (see the doco) the code | |
512 | below will quietly trash it. */ | |
ebc7896c AC |
513 | sp = old_sp; |
514 | } | |
04714b91 | 515 | |
df407dfe | 516 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
517 | if (!values_type) |
518 | values_type = builtin_type (gdbarch)->builtin_int; | |
519 | ||
df407dfe | 520 | CHECK_TYPEDEF (values_type); |
04714b91 | 521 | |
41f1b697 DJ |
522 | /* Are we returning a value using a structure return (passing a |
523 | hidden argument pointing to storage) or a normal value return? | |
524 | There are two cases: language-mandated structure return and | |
525 | target ABI structure return. The variable STRUCT_RETURN only | |
526 | describes the latter. The language version is handled by passing | |
527 | the return location as the first parameter to the function, | |
528 | even preceding "this". This is different from the target | |
529 | ABI version, which is target-specific; for instance, on ia64 | |
530 | the first argument is passed in out0 but the hidden structure | |
531 | return pointer would normally be passed in r8. */ | |
532 | ||
533 | if (language_pass_by_reference (values_type)) | |
534 | { | |
535 | lang_struct_return = 1; | |
04714b91 | 536 | |
41f1b697 DJ |
537 | /* Tell the target specific argument pushing routine not to |
538 | expect a value. */ | |
539 | target_values_type = builtin_type_void; | |
540 | } | |
541 | else | |
542 | { | |
c055b101 | 543 | struct_return = using_struct_return (value_type (function), values_type); |
41f1b697 DJ |
544 | target_values_type = values_type; |
545 | } | |
04714b91 | 546 | |
7043d8dc AC |
547 | /* Determine the location of the breakpoint (and possibly other |
548 | stuff) that the called function will return to. The SPARC, for a | |
549 | function returning a structure or union, needs to make space for | |
550 | not just the breakpoint but also an extra word containing the | |
551 | size (?) of the structure being passed. */ | |
552 | ||
553 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there | |
554 | is no need to write that out. */ | |
555 | ||
0b9dfe2b | 556 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
557 | { |
558 | case ON_STACK: | |
3b676233 | 559 | sp = push_dummy_code (gdbarch, sp, funaddr, |
82585c72 | 560 | args, nargs, target_values_type, |
594f7785 | 561 | &real_pc, &bp_addr, get_current_regcache ()); |
7043d8dc | 562 | break; |
04714b91 | 563 | case AT_ENTRY_POINT: |
3b676233 DE |
564 | { |
565 | CORE_ADDR dummy_addr; | |
566 | ||
567 | real_pc = funaddr; | |
568 | dummy_addr = entry_point_address (); | |
569 | /* Make certain that the address points at real code, and not a | |
570 | function descriptor. */ | |
571 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
572 | dummy_addr, | |
573 | ¤t_target); | |
574 | /* A call dummy always consists of just a single breakpoint, so | |
575 | its address is the same as the address of the dummy. */ | |
576 | bp_addr = dummy_addr; | |
577 | break; | |
578 | } | |
9710e734 AC |
579 | case AT_SYMBOL: |
580 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose | |
581 | address is the location where the breakpoint should be | |
582 | placed. Once all targets are using the overhauled frame code | |
583 | this can be deleted - ON_STACK is a better option. */ | |
584 | { | |
585 | struct minimal_symbol *sym; | |
3b676233 | 586 | CORE_ADDR dummy_addr; |
9710e734 AC |
587 | |
588 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); | |
589 | real_pc = funaddr; | |
590 | if (sym) | |
591 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); | |
592 | else | |
593 | dummy_addr = entry_point_address (); | |
0285512f AC |
594 | /* Make certain that the address points at real code, and not |
595 | a function descriptor. */ | |
0b9dfe2b | 596 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, |
e2d0e7eb AC |
597 | dummy_addr, |
598 | ¤t_target); | |
0285512f AC |
599 | /* A call dummy always consists of just a single breakpoint, |
600 | so it's address is the same as the address of the dummy. */ | |
9710e734 AC |
601 | bp_addr = dummy_addr; |
602 | break; | |
603 | } | |
04714b91 | 604 | default: |
e2e0b3e5 | 605 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
606 | } |
607 | ||
04714b91 | 608 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 609 | error (_("Too few arguments in function call.")); |
04714b91 | 610 | |
ebc7896c AC |
611 | { |
612 | int i; | |
613 | for (i = nargs - 1; i >= 0; i--) | |
614 | { | |
615 | int prototyped; | |
616 | struct type *param_type; | |
617 | ||
618 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
619 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
620 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
621 | prototyped = 1; | |
622 | else if (i < TYPE_NFIELDS (ftype)) | |
623 | prototyped = TYPE_PROTOTYPED (ftype); | |
624 | else | |
625 | prototyped = 0; | |
626 | ||
627 | if (i < TYPE_NFIELDS (ftype)) | |
628 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
629 | else | |
630 | param_type = NULL; | |
41f1b697 | 631 | |
7788af6d UW |
632 | args[i] = value_arg_coerce (gdbarch, args[i], |
633 | param_type, prototyped, &sp); | |
ebc7896c | 634 | |
41f1b697 DJ |
635 | if (param_type != NULL && language_pass_by_reference (param_type)) |
636 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
637 | } |
638 | } | |
04714b91 | 639 | |
04714b91 AC |
640 | /* Reserve space for the return structure to be written on the |
641 | stack, if necessary. Make certain that the value is correctly | |
642 | aligned. */ | |
643 | ||
41f1b697 | 644 | if (struct_return || lang_struct_return) |
04714b91 | 645 | { |
df407dfe | 646 | int len = TYPE_LENGTH (values_type); |
0b9dfe2b | 647 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
648 | { |
649 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
650 | making space for the return value. */ | |
651 | sp -= len; | |
0b9dfe2b MD |
652 | if (gdbarch_frame_align_p (gdbarch)) |
653 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
654 | struct_addr = sp; |
655 | } | |
656 | else | |
657 | { | |
658 | /* Stack grows upward. Align the frame, allocate space, and | |
659 | then again, re-align the frame??? */ | |
0b9dfe2b MD |
660 | if (gdbarch_frame_align_p (gdbarch)) |
661 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
662 | struct_addr = sp; |
663 | sp += len; | |
0b9dfe2b MD |
664 | if (gdbarch_frame_align_p (gdbarch)) |
665 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
666 | } |
667 | } | |
668 | ||
41f1b697 DJ |
669 | if (lang_struct_return) |
670 | { | |
671 | struct value **new_args; | |
672 | ||
673 | /* Add the new argument to the front of the argument list. */ | |
674 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
675 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
676 | struct_addr); | |
677 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
678 | args = new_args; | |
679 | nargs++; | |
680 | args_cleanup = make_cleanup (xfree, args); | |
681 | } | |
682 | else | |
683 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
684 | ||
04714b91 AC |
685 | /* Create the dummy stack frame. Pass in the call dummy address as, |
686 | presumably, the ABI code knows where, in the call dummy, the | |
687 | return address should be pointed. */ | |
0b9dfe2b MD |
688 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
689 | bp_addr, nargs, args, | |
594f7785 | 690 | sp, struct_return, struct_addr); |
04714b91 | 691 | |
41f1b697 DJ |
692 | do_cleanups (args_cleanup); |
693 | ||
96860204 AC |
694 | /* Set up a frame ID for the dummy frame so we can pass it to |
695 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
696 | ID so that the breakpoint code can correctly re-identify the | |
697 | dummy breakpoint. */ | |
8241eaa6 | 698 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 699 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 700 | the frame ID's stack address. */ |
96860204 | 701 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 702 | |
74cfe982 AC |
703 | /* Create a momentary breakpoint at the return address of the |
704 | inferior. That way it breaks when it returns. */ | |
04714b91 | 705 | |
74cfe982 AC |
706 | { |
707 | struct breakpoint *bpt; | |
708 | struct symtab_and_line sal; | |
74cfe982 AC |
709 | init_sal (&sal); /* initialize to zeroes */ |
710 | sal.pc = bp_addr; | |
711 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
712 | /* Sanity. The exact same SP value is returned by |
713 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 714 | dummy_id to form the frame ID's stack address. */ |
96860204 | 715 | bpt = set_momentary_breakpoint (sal, dummy_id, bp_call_dummy); |
74cfe982 AC |
716 | bpt->disposition = disp_del; |
717 | } | |
04714b91 | 718 | |
96860204 AC |
719 | /* Everything's ready, push all the info needed to restore the |
720 | caller (and identify the dummy-frame) onto the dummy-frame | |
721 | stack. */ | |
b89667eb DE |
722 | dummy_frame_push (caller_state, &dummy_id); |
723 | ||
724 | /* Discard both inf_status and caller_state cleanups. | |
725 | From this point on we explicitly restore the associated state | |
726 | or discard it. */ | |
727 | discard_cleanups (inf_status_cleanup); | |
96860204 AC |
728 | |
729 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - | |
730 | If you're looking to implement asynchronous dummy-frames, then | |
731 | just below is the place to chop this function in two.. */ | |
732 | ||
b89667eb DE |
733 | /* TP is invalid after run_inferior_call returns, so enclose this |
734 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 735 | { |
32400beb | 736 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 737 | |
b89667eb DE |
738 | /* Save this thread's ptid, we need it later but the thread |
739 | may have exited. */ | |
740 | call_thread_ptid = tp->ptid; | |
74cfe982 | 741 | |
b89667eb | 742 | /* Run the inferior until it stops. */ |
f5871ec0 | 743 | |
b89667eb | 744 | e = run_inferior_call (tp, real_pc); |
52557533 | 745 | } |
04714b91 | 746 | |
b89667eb DE |
747 | /* Rethrow an error if we got one trying to run the inferior. */ |
748 | ||
749 | if (e.reason < 0) | |
750 | { | |
751 | const char *name = get_function_name (funaddr, | |
752 | name_buf, sizeof (name_buf)); | |
753 | ||
754 | discard_inferior_status (inf_status); | |
755 | ||
756 | /* We could discard the dummy frame here if the program exited, | |
757 | but it will get garbage collected the next time the program is | |
758 | run anyway. */ | |
759 | ||
760 | switch (e.reason) | |
761 | { | |
762 | case RETURN_ERROR: | |
763 | throw_error (e.error, _("\ | |
764 | %s\n\ | |
765 | An error occurred while in a function called from GDB.\n\ | |
766 | Evaluation of the expression containing the function\n\ | |
767 | (%s) will be abandoned.\n\ | |
768 | When the function is done executing, GDB will silently stop."), | |
769 | e.message, name); | |
770 | case RETURN_QUIT: | |
771 | default: | |
772 | throw_exception (e); | |
773 | } | |
774 | } | |
775 | ||
776 | /* If the program has exited, or we stopped at a different thread, | |
777 | exit and inform the user. */ | |
778 | ||
de04a248 DE |
779 | if (! target_has_execution) |
780 | { | |
b89667eb DE |
781 | const char *name = get_function_name (funaddr, |
782 | name_buf, sizeof (name_buf)); | |
783 | ||
784 | /* If we try to restore the inferior status, | |
de04a248 | 785 | we'll crash as the inferior is no longer running. */ |
de04a248 | 786 | discard_inferior_status (inf_status); |
b89667eb DE |
787 | |
788 | /* We could discard the dummy frame here given that the program exited, | |
789 | but it will get garbage collected the next time the program is | |
790 | run anyway. */ | |
791 | ||
de04a248 | 792 | error (_("\ |
b89667eb DE |
793 | The program being debugged exited while in a function called from GDB.\n\ |
794 | Evaluation of the expression containing the function\n\ | |
795 | (%s) will be abandoned."), | |
796 | name); | |
797 | } | |
798 | ||
799 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
800 | { | |
801 | const char *name = get_function_name (funaddr, | |
802 | name_buf, sizeof (name_buf)); | |
803 | ||
804 | /* We've switched threads. This can happen if another thread gets a | |
805 | signal or breakpoint while our thread was running. | |
806 | There's no point in restoring the inferior status, | |
807 | we're in a different thread. */ | |
808 | discard_inferior_status (inf_status); | |
809 | /* Keep the dummy frame record, if the user switches back to the | |
810 | thread with the hand-call, we'll need it. */ | |
811 | if (stopped_by_random_signal) | |
812 | error (_("\ | |
813 | The program received a signal in another thread while\n\ | |
814 | making a function call from GDB.\n\ | |
815 | Evaluation of the expression containing the function\n\ | |
816 | (%s) will be abandoned.\n\ | |
817 | When the function is done executing, GDB will silently stop."), | |
818 | name); | |
819 | else | |
820 | error (_("\ | |
821 | The program stopped in another thread while making a function call from GDB.\n\ | |
822 | Evaluation of the expression containing the function\n\ | |
823 | (%s) will be abandoned.\n\ | |
824 | When the function is done executing, GDB will silently stop."), | |
825 | name); | |
de04a248 DE |
826 | } |
827 | ||
52557533 AC |
828 | if (stopped_by_random_signal || !stop_stack_dummy) |
829 | { | |
b89667eb DE |
830 | const char *name = get_function_name (funaddr, |
831 | name_buf, sizeof (name_buf)); | |
832 | ||
52557533 AC |
833 | if (stopped_by_random_signal) |
834 | { | |
835 | /* We stopped inside the FUNCTION because of a random | |
836 | signal. Further execution of the FUNCTION is not | |
837 | allowed. */ | |
04714b91 | 838 | |
52557533 AC |
839 | if (unwind_on_signal_p) |
840 | { | |
841 | /* The user wants the context restored. */ | |
842 | ||
843 | /* We must get back to the frame we were before the | |
b89667eb DE |
844 | dummy call. */ |
845 | dummy_frame_pop (dummy_id); | |
846 | ||
847 | /* We also need to restore inferior status to that before the | |
848 | dummy call. */ | |
849 | restore_inferior_status (inf_status); | |
04714b91 | 850 | |
52557533 AC |
851 | /* FIXME: Insert a bunch of wrap_here; name can be very |
852 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 853 | error (_("\ |
04714b91 AC |
854 | The program being debugged was signaled while in a function called from GDB.\n\ |
855 | GDB has restored the context to what it was before the call.\n\ | |
2e74121d | 856 | To change this behavior use \"set unwindonsignal off\".\n\ |
b89667eb DE |
857 | Evaluation of the expression containing the function\n\ |
858 | (%s) will be abandoned."), | |
52557533 AC |
859 | name); |
860 | } | |
861 | else | |
862 | { | |
863 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
864 | (default). |
865 | Discard inferior status, we're not at the same point | |
866 | we started at. */ | |
52557533 | 867 | discard_inferior_status (inf_status); |
b89667eb | 868 | |
52557533 AC |
869 | /* FIXME: Insert a bunch of wrap_here; name can be very |
870 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 871 | error (_("\ |
04714b91 AC |
872 | The program being debugged was signaled while in a function called from GDB.\n\ |
873 | GDB remains in the frame where the signal was received.\n\ | |
2e74121d | 874 | To change this behavior use \"set unwindonsignal on\".\n\ |
b89667eb DE |
875 | Evaluation of the expression containing the function\n\ |
876 | (%s) will be abandoned.\n\ | |
877 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
878 | name); |
879 | } | |
880 | } | |
04714b91 | 881 | |
52557533 AC |
882 | if (!stop_stack_dummy) |
883 | { | |
b89667eb DE |
884 | /* We hit a breakpoint inside the FUNCTION. |
885 | Keep the dummy frame, the user may want to examine its state. | |
886 | Discard inferior status, we're not at the same point | |
887 | we started at. */ | |
52557533 | 888 | discard_inferior_status (inf_status); |
b89667eb | 889 | |
52557533 AC |
890 | /* The following error message used to say "The expression |
891 | which contained the function call has been discarded." | |
892 | It is a hard concept to explain in a few words. Ideally, | |
893 | GDB would be able to resume evaluation of the expression | |
894 | when the function finally is done executing. Perhaps | |
895 | someday this will be implemented (it would not be easy). */ | |
896 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
897 | a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 898 | error (_("\ |
04714b91 | 899 | The program being debugged stopped while in a function called from GDB.\n\ |
b89667eb DE |
900 | Evaluation of the expression containing the function\n\ |
901 | (%s) will be abandoned.\n\ | |
902 | When the function is done executing, GDB will silently stop."), | |
903 | name); | |
52557533 AC |
904 | } |
905 | ||
906 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 907 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 908 | } |
04714b91 | 909 | |
b89667eb DE |
910 | /* If we get here the called FUNCTION ran to completion, |
911 | and the dummy frame has already been popped. */ | |
74cfe982 | 912 | |
44e5158b | 913 | { |
b89667eb DE |
914 | struct regcache *retbuf = regcache_xmalloc (gdbarch); |
915 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); | |
1a4d7a36 MK |
916 | struct value *retval = NULL; |
917 | ||
b89667eb DE |
918 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
919 | ||
920 | /* Inferior call is successful. Restore the inferior status. | |
921 | At this stage, leave the RETBUF alone. */ | |
922 | restore_inferior_status (inf_status); | |
923 | ||
924 | /* Figure out the value returned by the function. */ | |
925 | ||
41f1b697 DJ |
926 | if (lang_struct_return) |
927 | retval = value_at (values_type, struct_addr); | |
928 | else if (TYPE_CODE (target_values_type) == TYPE_CODE_VOID) | |
44e5158b | 929 | { |
1a4d7a36 MK |
930 | /* If the function returns void, don't bother fetching the |
931 | return value. */ | |
df407dfe | 932 | retval = allocate_value (values_type); |
44e5158b | 933 | } |
1a4d7a36 MK |
934 | else |
935 | { | |
c055b101 CV |
936 | switch (gdbarch_return_value (gdbarch, value_type (function), |
937 | target_values_type, NULL, NULL, NULL)) | |
1a4d7a36 MK |
938 | { |
939 | case RETURN_VALUE_REGISTER_CONVENTION: | |
940 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: | |
941 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: | |
942 | retval = allocate_value (values_type); | |
c055b101 CV |
943 | gdbarch_return_value (gdbarch, value_type (function), values_type, |
944 | retbuf, value_contents_raw (retval), NULL); | |
1a4d7a36 MK |
945 | break; |
946 | case RETURN_VALUE_STRUCT_CONVENTION: | |
947 | retval = value_at (values_type, struct_addr); | |
948 | break; | |
949 | } | |
950 | } | |
951 | ||
44e5158b | 952 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 953 | |
b89667eb | 954 | gdb_assert (retval); |
44e5158b AC |
955 | return retval; |
956 | } | |
04714b91 | 957 | } |
1a4d7a36 | 958 | \f |
04714b91 | 959 | |
1a4d7a36 | 960 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
961 | void _initialize_infcall (void); |
962 | ||
963 | void | |
964 | _initialize_infcall (void) | |
965 | { | |
966 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
967 | &coerce_float_to_double_p, _("\ |
968 | Set coercion of floats to doubles when calling functions."), _("\ | |
969 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
970 | Variables of type float should generally be converted to doubles before\n\ |
971 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
972 | function. However, some older debug info formats do not provide enough\n\ | |
973 | information to determine that a function is prototyped. If this flag is\n\ | |
974 | set, GDB will perform the conversion for a function it considers\n\ | |
975 | unprototyped.\n\ | |
7915a72c | 976 | The default is to perform the conversion.\n"), |
2c5b56ce | 977 | NULL, |
920d2a44 | 978 | show_coerce_float_to_double_p, |
2c5b56ce | 979 | &setlist, &showlist); |
04714b91 AC |
980 | |
981 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
982 | &unwind_on_signal_p, _("\ |
983 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
984 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
985 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
986 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
987 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 988 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 989 | NULL, |
920d2a44 | 990 | show_unwind_on_signal_p, |
2c5b56ce | 991 | &setlist, &showlist); |
04714b91 | 992 | } |