Commit | Line | Data |
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04714b91 AC |
1 | /* Perform an inferior function call, for GDB, the GNU debugger. |
2 | ||
e2882c85 | 3 | Copyright (C) 1986-2018 Free Software Foundation, Inc. |
04714b91 AC |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
04714b91 AC |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
04714b91 AC |
19 | |
20 | #include "defs.h" | |
0700e23e | 21 | #include "infcall.h" |
04714b91 | 22 | #include "breakpoint.h" |
573cda03 | 23 | #include "tracepoint.h" |
04714b91 AC |
24 | #include "target.h" |
25 | #include "regcache.h" | |
26 | #include "inferior.h" | |
45741a9c | 27 | #include "infrun.h" |
04714b91 AC |
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" | |
96860204 | 34 | #include "dummy-frame.h" |
a93c0eb6 | 35 | #include "ada-lang.h" |
347bddb7 | 36 | #include "gdbthread.h" |
beb460e8 | 37 | #include "event-top.h" |
76727919 | 38 | #include "observable.h" |
0b333c5e PA |
39 | #include "top.h" |
40 | #include "interps.h" | |
388a7084 | 41 | #include "thread-fsm.h" |
6ccb583f | 42 | #include <algorithm> |
b89667eb DE |
43 | |
44 | /* If we can't find a function's name from its address, | |
45 | we print this instead. */ | |
46 | #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" | |
47 | #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ | |
48 | + 2 * sizeof (CORE_ADDR)) | |
04714b91 AC |
49 | |
50 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
51 | ||
52 | GDB needs an asynchronous expression evaluator, that means an | |
53 | asynchronous inferior function call implementation, and that in | |
54 | turn means restructuring the code so that it is event driven. */ | |
55 | ||
56 | /* How you should pass arguments to a function depends on whether it | |
57 | was defined in K&R style or prototype style. If you define a | |
58 | function using the K&R syntax that takes a `float' argument, then | |
59 | callers must pass that argument as a `double'. If you define the | |
60 | function using the prototype syntax, then you must pass the | |
61 | argument as a `float', with no promotion. | |
62 | ||
63 | Unfortunately, on certain older platforms, the debug info doesn't | |
64 | indicate reliably how each function was defined. A function type's | |
a9ff5f12 UW |
65 | TYPE_PROTOTYPED flag may be clear, even if the function was defined |
66 | in prototype style. When calling a function whose TYPE_PROTOTYPED | |
67 | flag is clear, GDB consults this flag to decide what to do. | |
04714b91 AC |
68 | |
69 | For modern targets, it is proper to assume that, if the prototype | |
70 | flag is clear, that can be trusted: `float' arguments should be | |
71 | promoted to `double'. For some older targets, if the prototype | |
72 | flag is clear, that doesn't tell us anything. The default is to | |
73 | trust the debug information; the user can override this behavior | |
74 | with "set coerce-float-to-double 0". */ | |
75 | ||
76 | static int coerce_float_to_double_p = 1; | |
920d2a44 AC |
77 | static void |
78 | show_coerce_float_to_double_p (struct ui_file *file, int from_tty, | |
79 | struct cmd_list_element *c, const char *value) | |
80 | { | |
3e43a32a MS |
81 | fprintf_filtered (file, |
82 | _("Coercion of floats to doubles " | |
83 | "when calling functions is %s.\n"), | |
920d2a44 AC |
84 | value); |
85 | } | |
04714b91 AC |
86 | |
87 | /* This boolean tells what gdb should do if a signal is received while | |
88 | in a function called from gdb (call dummy). If set, gdb unwinds | |
89 | the stack and restore the context to what as it was before the | |
90 | call. | |
91 | ||
1777feb0 | 92 | The default is to stop in the frame where the signal was received. */ |
04714b91 | 93 | |
ef61f180 | 94 | static int unwind_on_signal_p = 0; |
920d2a44 AC |
95 | static void |
96 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, | |
97 | struct cmd_list_element *c, const char *value) | |
98 | { | |
3e43a32a MS |
99 | fprintf_filtered (file, |
100 | _("Unwinding of stack if a signal is " | |
101 | "received while in a call dummy is %s.\n"), | |
920d2a44 AC |
102 | value); |
103 | } | |
104 | ||
7cd1089b PM |
105 | /* This boolean tells what gdb should do if a std::terminate call is |
106 | made while in a function called from gdb (call dummy). | |
107 | As the confines of a single dummy stack prohibit out-of-frame | |
108 | handlers from handling a raised exception, and as out-of-frame | |
109 | handlers are common in C++, this can lead to no handler being found | |
110 | by the unwinder, and a std::terminate call. This is a false positive. | |
111 | If set, gdb unwinds the stack and restores the context to what it | |
112 | was before the call. | |
113 | ||
114 | The default is to unwind the frame if a std::terminate call is | |
115 | made. */ | |
116 | ||
117 | static int unwind_on_terminating_exception_p = 1; | |
118 | ||
119 | static void | |
120 | show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, | |
121 | struct cmd_list_element *c, | |
122 | const char *value) | |
123 | ||
124 | { | |
3e43a32a MS |
125 | fprintf_filtered (file, |
126 | _("Unwind stack if a C++ exception is " | |
127 | "unhandled while in a call dummy is %s.\n"), | |
7cd1089b PM |
128 | value); |
129 | } | |
04714b91 AC |
130 | |
131 | /* Perform the standard coercions that are specified | |
a93c0eb6 | 132 | for arguments to be passed to C or Ada functions. |
04714b91 AC |
133 | |
134 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
a93c0eb6 JB |
135 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
136 | SP is the stack pointer were additional data can be pushed (updating | |
137 | its value as needed). */ | |
04714b91 AC |
138 | |
139 | static struct value * | |
7788af6d UW |
140 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
141 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) | |
04714b91 | 142 | { |
7788af6d | 143 | const struct builtin_type *builtin = builtin_type (gdbarch); |
df407dfe | 144 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 145 | struct type *type |
04714b91 AC |
146 | = param_type ? check_typedef (param_type) : arg_type; |
147 | ||
a93c0eb6 JB |
148 | /* Perform any Ada-specific coercion first. */ |
149 | if (current_language->la_language == language_ada) | |
40bc484c | 150 | arg = ada_convert_actual (arg, type); |
a93c0eb6 | 151 | |
63092375 DJ |
152 | /* Force the value to the target if we will need its address. At |
153 | this point, we could allocate arguments on the stack instead of | |
154 | calling malloc if we knew that their addresses would not be | |
155 | saved by the called function. */ | |
156 | arg = value_coerce_to_target (arg); | |
157 | ||
04714b91 AC |
158 | switch (TYPE_CODE (type)) |
159 | { | |
160 | case TYPE_CODE_REF: | |
aa006118 | 161 | case TYPE_CODE_RVALUE_REF: |
fb933624 DJ |
162 | { |
163 | struct value *new_value; | |
164 | ||
aa006118 | 165 | if (TYPE_IS_REFERENCE (arg_type)) |
b1af9e97 | 166 | return value_cast_pointers (type, arg, 0); |
fb933624 DJ |
167 | |
168 | /* Cast the value to the reference's target type, and then | |
169 | convert it back to a reference. This will issue an error | |
170 | if the value was not previously in memory - in some cases | |
171 | we should clearly be allowing this, but how? */ | |
172 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); | |
a65cfae5 | 173 | new_value = value_ref (new_value, TYPE_CODE (type)); |
fb933624 DJ |
174 | return new_value; |
175 | } | |
04714b91 AC |
176 | case TYPE_CODE_INT: |
177 | case TYPE_CODE_CHAR: | |
178 | case TYPE_CODE_BOOL: | |
179 | case TYPE_CODE_ENUM: | |
180 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
181 | if (!is_prototyped) | |
182 | { | |
7788af6d UW |
183 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
184 | type = builtin->builtin_int; | |
04714b91 AC |
185 | } |
186 | /* Currently all target ABIs require at least the width of an integer | |
187 | type for an argument. We may have to conditionalize the following | |
188 | type coercion for future targets. */ | |
7788af6d UW |
189 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
190 | type = builtin->builtin_int; | |
04714b91 AC |
191 | break; |
192 | case TYPE_CODE_FLT: | |
193 | if (!is_prototyped && coerce_float_to_double_p) | |
194 | { | |
7788af6d UW |
195 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
196 | type = builtin->builtin_double; | |
197 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) | |
198 | type = builtin->builtin_long_double; | |
04714b91 AC |
199 | } |
200 | break; | |
201 | case TYPE_CODE_FUNC: | |
202 | type = lookup_pointer_type (type); | |
203 | break; | |
204 | case TYPE_CODE_ARRAY: | |
205 | /* Arrays are coerced to pointers to their first element, unless | |
206 | they are vectors, in which case we want to leave them alone, | |
207 | because they are passed by value. */ | |
208 | if (current_language->c_style_arrays) | |
209 | if (!TYPE_VECTOR (type)) | |
210 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
211 | break; | |
212 | case TYPE_CODE_UNDEF: | |
213 | case TYPE_CODE_PTR: | |
214 | case TYPE_CODE_STRUCT: | |
215 | case TYPE_CODE_UNION: | |
216 | case TYPE_CODE_VOID: | |
217 | case TYPE_CODE_SET: | |
218 | case TYPE_CODE_RANGE: | |
219 | case TYPE_CODE_STRING: | |
04714b91 | 220 | case TYPE_CODE_ERROR: |
0d5de010 DJ |
221 | case TYPE_CODE_MEMBERPTR: |
222 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
223 | case TYPE_CODE_METHOD: |
224 | case TYPE_CODE_COMPLEX: | |
225 | default: | |
226 | break; | |
227 | } | |
228 | ||
229 | return value_cast (type, arg); | |
230 | } | |
231 | ||
8388016d | 232 | /* See infcall.h. */ |
04714b91 | 233 | |
a9fa03de | 234 | CORE_ADDR |
8388016d PA |
235 | find_function_addr (struct value *function, |
236 | struct type **retval_type, | |
237 | struct type **function_type) | |
04714b91 | 238 | { |
df407dfe | 239 | struct type *ftype = check_typedef (value_type (function)); |
50810684 | 240 | struct gdbarch *gdbarch = get_type_arch (ftype); |
7788af6d | 241 | struct type *value_type = NULL; |
09b58708 JK |
242 | /* Initialize it just to avoid a GCC false warning. */ |
243 | CORE_ADDR funaddr = 0; | |
04714b91 AC |
244 | |
245 | /* If it's a member function, just look at the function | |
246 | part of it. */ | |
247 | ||
248 | /* Determine address to call. */ | |
300f8e10 JK |
249 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
250 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
251 | funaddr = value_address (function); | |
252 | else if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
04714b91 AC |
253 | { |
254 | funaddr = value_as_address (function); | |
255 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
256 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
257 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
300f8e10 | 258 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
8b88a78e | 259 | current_top_target ()); |
04714b91 | 260 | } |
300f8e10 JK |
261 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
262 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
07be84bf | 263 | { |
07be84bf JK |
264 | if (TYPE_GNU_IFUNC (ftype)) |
265 | { | |
8388016d | 266 | CORE_ADDR resolver_addr = funaddr; |
07be84bf | 267 | |
8388016d PA |
268 | /* Resolve the ifunc. Note this may call the resolver |
269 | function in the inferior. */ | |
270 | funaddr = gnu_ifunc_resolve_addr (gdbarch, resolver_addr); | |
271 | ||
272 | /* Skip querying the function symbol if no RETVAL_TYPE or | |
273 | FUNCTION_TYPE have been asked for. */ | |
274 | if (retval_type != NULL || function_type != NULL) | |
275 | { | |
276 | type *target_ftype = find_function_type (funaddr); | |
277 | /* If we don't have debug info for the target function, | |
278 | see if we can instead extract the target function's | |
279 | type from the type that the resolver returns. */ | |
280 | if (target_ftype == NULL) | |
281 | target_ftype = find_gnu_ifunc_target_type (resolver_addr); | |
282 | if (target_ftype != NULL) | |
283 | { | |
284 | value_type = TYPE_TARGET_TYPE (check_typedef (target_ftype)); | |
285 | ftype = target_ftype; | |
286 | } | |
287 | } | |
07be84bf | 288 | } |
8388016d PA |
289 | else |
290 | value_type = TYPE_TARGET_TYPE (ftype); | |
07be84bf | 291 | } |
300f8e10 | 292 | else if (TYPE_CODE (ftype) == TYPE_CODE_INT) |
04714b91 AC |
293 | { |
294 | /* Handle the case of functions lacking debugging info. | |
1777feb0 | 295 | Their values are characters since their addresses are char. */ |
04714b91 AC |
296 | if (TYPE_LENGTH (ftype) == 1) |
297 | funaddr = value_as_address (value_addr (function)); | |
298 | else | |
2bbe3cc1 DJ |
299 | { |
300 | /* Handle function descriptors lacking debug info. */ | |
301 | int found_descriptor = 0; | |
abbb1732 | 302 | |
87bc73ea | 303 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
304 | if (VALUE_LVAL (function) == lval_memory) |
305 | { | |
306 | CORE_ADDR nfunaddr; | |
abbb1732 | 307 | |
2bbe3cc1 DJ |
308 | funaddr = value_as_address (value_addr (function)); |
309 | nfunaddr = funaddr; | |
8b88a78e PA |
310 | funaddr |
311 | = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, | |
312 | current_top_target ()); | |
2bbe3cc1 DJ |
313 | if (funaddr != nfunaddr) |
314 | found_descriptor = 1; | |
315 | } | |
316 | if (!found_descriptor) | |
317 | /* Handle integer used as address of a function. */ | |
318 | funaddr = (CORE_ADDR) value_as_long (function); | |
319 | } | |
04714b91 AC |
320 | } |
321 | else | |
8a3fe4f8 | 322 | error (_("Invalid data type for function to be called.")); |
04714b91 | 323 | |
7d9b040b RC |
324 | if (retval_type != NULL) |
325 | *retval_type = value_type; | |
8388016d PA |
326 | if (function_type != NULL) |
327 | *function_type = ftype; | |
50810684 | 328 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
04714b91 AC |
329 | } |
330 | ||
d3712828 AC |
331 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
332 | function returns to. */ | |
7043d8dc AC |
333 | |
334 | static CORE_ADDR | |
335 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 336 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
337 | struct value **args, int nargs, |
338 | struct type *value_type, | |
e4fd649a UW |
339 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
340 | struct regcache *regcache) | |
7043d8dc | 341 | { |
50a834af MK |
342 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
343 | ||
344 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
345 | args, nargs, value_type, real_pc, bp_addr, | |
346 | regcache); | |
7043d8dc AC |
347 | } |
348 | ||
7022349d PA |
349 | /* See infcall.h. */ |
350 | ||
351 | void | |
352 | error_call_unknown_return_type (const char *func_name) | |
353 | { | |
354 | if (func_name != NULL) | |
355 | error (_("'%s' has unknown return type; " | |
356 | "cast the call to its declared return type"), | |
357 | func_name); | |
358 | else | |
359 | error (_("function has unknown return type; " | |
360 | "cast the call to its declared return type")); | |
361 | } | |
362 | ||
b89667eb DE |
363 | /* Fetch the name of the function at FUNADDR. |
364 | This is used in printing an error message for call_function_by_hand. | |
365 | BUF is used to print FUNADDR in hex if the function name cannot be | |
366 | determined. It must be large enough to hold formatted result of | |
367 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
368 | ||
369 | static const char * | |
370 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
371 | { | |
372 | { | |
373 | struct symbol *symbol = find_pc_function (funaddr); | |
abbb1732 | 374 | |
b89667eb DE |
375 | if (symbol) |
376 | return SYMBOL_PRINT_NAME (symbol); | |
377 | } | |
378 | ||
379 | { | |
380 | /* Try the minimal symbols. */ | |
7cbd4a93 | 381 | struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr); |
abbb1732 | 382 | |
7cbd4a93 | 383 | if (msymbol.minsym) |
efd66ac6 | 384 | return MSYMBOL_PRINT_NAME (msymbol.minsym); |
b89667eb DE |
385 | } |
386 | ||
387 | { | |
528e1572 SM |
388 | std::string tmp = string_printf (_(RAW_FUNCTION_ADDRESS_FORMAT), |
389 | hex_string (funaddr)); | |
abbb1732 | 390 | |
528e1572 SM |
391 | gdb_assert (tmp.length () + 1 <= buf_size); |
392 | return strcpy (buf, tmp.c_str ()); | |
b89667eb DE |
393 | } |
394 | } | |
395 | ||
388a7084 PA |
396 | /* All the meta data necessary to extract the call's return value. */ |
397 | ||
398 | struct call_return_meta_info | |
399 | { | |
400 | /* The caller frame's architecture. */ | |
401 | struct gdbarch *gdbarch; | |
402 | ||
403 | /* The called function. */ | |
404 | struct value *function; | |
405 | ||
406 | /* The return value's type. */ | |
407 | struct type *value_type; | |
408 | ||
409 | /* Are we returning a value using a structure return or a normal | |
410 | value return? */ | |
411 | int struct_return_p; | |
412 | ||
413 | /* If using a structure return, this is the structure's address. */ | |
414 | CORE_ADDR struct_addr; | |
388a7084 PA |
415 | }; |
416 | ||
417 | /* Extract the called function's return value. */ | |
418 | ||
419 | static struct value * | |
420 | get_call_return_value (struct call_return_meta_info *ri) | |
421 | { | |
422 | struct value *retval = NULL; | |
00431a78 PA |
423 | thread_info *thr = inferior_thread (); |
424 | bool stack_temporaries = thread_stack_temporaries_enabled_p (thr); | |
388a7084 PA |
425 | |
426 | if (TYPE_CODE (ri->value_type) == TYPE_CODE_VOID) | |
427 | retval = allocate_value (ri->value_type); | |
428 | else if (ri->struct_return_p) | |
429 | { | |
430 | if (stack_temporaries) | |
431 | { | |
432 | retval = value_from_contents_and_address (ri->value_type, NULL, | |
433 | ri->struct_addr); | |
00431a78 | 434 | push_thread_stack_temporary (thr, retval); |
388a7084 PA |
435 | } |
436 | else | |
437 | { | |
438 | retval = allocate_value (ri->value_type); | |
439 | read_value_memory (retval, 0, 1, ri->struct_addr, | |
440 | value_contents_raw (retval), | |
441 | TYPE_LENGTH (ri->value_type)); | |
442 | } | |
443 | } | |
444 | else | |
445 | { | |
446 | retval = allocate_value (ri->value_type); | |
447 | gdbarch_return_value (ri->gdbarch, ri->function, ri->value_type, | |
448 | get_current_regcache (), | |
449 | value_contents_raw (retval), NULL); | |
450 | if (stack_temporaries && class_or_union_p (ri->value_type)) | |
451 | { | |
452 | /* Values of class type returned in registers are copied onto | |
453 | the stack and their lval_type set to lval_memory. This is | |
454 | required because further evaluation of the expression | |
455 | could potentially invoke methods on the return value | |
456 | requiring GDB to evaluate the "this" pointer. To evaluate | |
457 | the this pointer, GDB needs the memory address of the | |
458 | value. */ | |
459 | value_force_lval (retval, ri->struct_addr); | |
00431a78 | 460 | push_thread_stack_temporary (thr, retval); |
388a7084 PA |
461 | } |
462 | } | |
463 | ||
464 | gdb_assert (retval != NULL); | |
465 | return retval; | |
466 | } | |
467 | ||
468 | /* Data for the FSM that manages an infcall. It's main job is to | |
469 | record the called function's return value. */ | |
470 | ||
471 | struct call_thread_fsm | |
472 | { | |
473 | /* The base class. */ | |
474 | struct thread_fsm thread_fsm; | |
475 | ||
476 | /* All the info necessary to be able to extract the return | |
477 | value. */ | |
478 | struct call_return_meta_info return_meta_info; | |
479 | ||
480 | /* The called function's return value. This is extracted from the | |
481 | target before the dummy frame is popped. */ | |
482 | struct value *return_value; | |
3b12939d PA |
483 | |
484 | /* The top level that started the infcall (and is synchronously | |
485 | waiting for it to end). */ | |
486 | struct ui *waiting_ui; | |
388a7084 PA |
487 | }; |
488 | ||
8980e177 PA |
489 | static int call_thread_fsm_should_stop (struct thread_fsm *self, |
490 | struct thread_info *thread); | |
388a7084 PA |
491 | static int call_thread_fsm_should_notify_stop (struct thread_fsm *self); |
492 | ||
493 | /* call_thread_fsm's vtable. */ | |
494 | ||
495 | static struct thread_fsm_ops call_thread_fsm_ops = | |
496 | { | |
497 | NULL, /*dtor */ | |
498 | NULL, /* clean_up */ | |
499 | call_thread_fsm_should_stop, | |
500 | NULL, /* return_value */ | |
501 | NULL, /* async_reply_reason*/ | |
502 | call_thread_fsm_should_notify_stop, | |
503 | }; | |
504 | ||
505 | /* Allocate a new call_thread_fsm object. */ | |
506 | ||
507 | static struct call_thread_fsm * | |
8980e177 | 508 | new_call_thread_fsm (struct ui *waiting_ui, struct interp *cmd_interp, |
3b12939d | 509 | struct gdbarch *gdbarch, struct value *function, |
388a7084 PA |
510 | struct type *value_type, |
511 | int struct_return_p, CORE_ADDR struct_addr) | |
512 | { | |
513 | struct call_thread_fsm *sm; | |
514 | ||
515 | sm = XCNEW (struct call_thread_fsm); | |
8980e177 | 516 | thread_fsm_ctor (&sm->thread_fsm, &call_thread_fsm_ops, cmd_interp); |
388a7084 PA |
517 | |
518 | sm->return_meta_info.gdbarch = gdbarch; | |
519 | sm->return_meta_info.function = function; | |
520 | sm->return_meta_info.value_type = value_type; | |
521 | sm->return_meta_info.struct_return_p = struct_return_p; | |
522 | sm->return_meta_info.struct_addr = struct_addr; | |
523 | ||
3b12939d PA |
524 | sm->waiting_ui = waiting_ui; |
525 | ||
388a7084 PA |
526 | return sm; |
527 | } | |
528 | ||
529 | /* Implementation of should_stop method for infcalls. */ | |
530 | ||
531 | static int | |
8980e177 PA |
532 | call_thread_fsm_should_stop (struct thread_fsm *self, |
533 | struct thread_info *thread) | |
388a7084 PA |
534 | { |
535 | struct call_thread_fsm *f = (struct call_thread_fsm *) self; | |
536 | ||
537 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
538 | { | |
539 | /* Done. */ | |
540 | thread_fsm_set_finished (self); | |
541 | ||
542 | /* Stash the return value before the dummy frame is popped and | |
543 | registers are restored to what they were before the | |
544 | call.. */ | |
545 | f->return_value = get_call_return_value (&f->return_meta_info); | |
546 | ||
547 | /* Break out of wait_sync_command_done. */ | |
4b6749b9 | 548 | scoped_restore save_ui = make_scoped_restore (¤t_ui, f->waiting_ui); |
223ffa71 | 549 | target_terminal::ours (); |
3b12939d | 550 | f->waiting_ui->prompt_state = PROMPT_NEEDED; |
388a7084 PA |
551 | } |
552 | ||
553 | return 1; | |
554 | } | |
555 | ||
556 | /* Implementation of should_notify_stop method for infcalls. */ | |
557 | ||
558 | static int | |
559 | call_thread_fsm_should_notify_stop (struct thread_fsm *self) | |
560 | { | |
561 | if (thread_fsm_finished_p (self)) | |
562 | { | |
563 | /* Infcall succeeded. Be silent and proceed with evaluating the | |
564 | expression. */ | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /* Something wrong happened. E.g., an unexpected breakpoint | |
569 | triggered, or a signal was intercepted. Notify the stop. */ | |
570 | return 1; | |
571 | } | |
572 | ||
b89667eb DE |
573 | /* Subroutine of call_function_by_hand to simplify it. |
574 | Start up the inferior and wait for it to stop. | |
575 | Return the exception if there's an error, or an exception with | |
576 | reason >= 0 if there's no error. | |
577 | ||
578 | This is done inside a TRY_CATCH so the caller needn't worry about | |
579 | thrown errors. The caller should rethrow if there's an error. */ | |
580 | ||
581 | static struct gdb_exception | |
388a7084 PA |
582 | run_inferior_call (struct call_thread_fsm *sm, |
583 | struct thread_info *call_thread, CORE_ADDR real_pc) | |
b89667eb | 584 | { |
492d29ea | 585 | struct gdb_exception caught_error = exception_none; |
16c381f0 | 586 | int saved_in_infcall = call_thread->control.in_infcall; |
b89667eb | 587 | ptid_t call_thread_ptid = call_thread->ptid; |
3b12939d | 588 | enum prompt_state saved_prompt_state = current_ui->prompt_state; |
28bf096c | 589 | int was_running = call_thread->state == THREAD_RUNNING; |
cb814510 | 590 | int saved_ui_async = current_ui->async; |
c933f875 PA |
591 | |
592 | /* Infcalls run synchronously, in the foreground. */ | |
3b12939d | 593 | current_ui->prompt_state = PROMPT_BLOCKED; |
0b333c5e PA |
594 | /* So that we don't print the prompt prematurely in |
595 | fetch_inferior_event. */ | |
cb814510 | 596 | current_ui->async = 0; |
b89667eb | 597 | |
6d61dee5 PA |
598 | delete_file_handler (current_ui->input_fd); |
599 | ||
16c381f0 | 600 | call_thread->control.in_infcall = 1; |
c5a4d20b | 601 | |
70509625 | 602 | clear_proceed_status (0); |
b89667eb | 603 | |
388a7084 PA |
604 | /* Associate the FSM with the thread after clear_proceed_status |
605 | (otherwise it'd clear this FSM), and before anything throws, so | |
606 | we don't leak it (and any resources it manages). */ | |
607 | call_thread->thread_fsm = &sm->thread_fsm; | |
608 | ||
b89667eb | 609 | disable_watchpoints_before_interactive_call_start (); |
16c381f0 | 610 | |
46c03469 | 611 | /* We want to print return value, please... */ |
16c381f0 | 612 | call_thread->control.proceed_to_finish = 1; |
b89667eb | 613 | |
492d29ea | 614 | TRY |
3dd5b83d | 615 | { |
64ce06e4 | 616 | proceed (real_pc, GDB_SIGNAL_0); |
3dd5b83d PA |
617 | |
618 | /* Inferior function calls are always synchronous, even if the | |
0b333c5e PA |
619 | target supports asynchronous execution. */ |
620 | wait_sync_command_done (); | |
3dd5b83d | 621 | } |
492d29ea PA |
622 | CATCH (e, RETURN_MASK_ALL) |
623 | { | |
624 | caught_error = e; | |
625 | } | |
626 | END_CATCH | |
b89667eb | 627 | |
3b12939d PA |
628 | /* If GDB has the prompt blocked before, then ensure that it remains |
629 | so. normal_stop calls async_enable_stdin, so reset the prompt | |
630 | state again here. In other cases, stdin will be re-enabled by | |
0b333c5e | 631 | inferior_event_handler, when an exception is thrown. */ |
3b12939d | 632 | current_ui->prompt_state = saved_prompt_state; |
6d61dee5 PA |
633 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
634 | delete_file_handler (current_ui->input_fd); | |
635 | else | |
636 | ui_register_input_event_handler (current_ui); | |
cb814510 | 637 | current_ui->async = saved_ui_async; |
0b333c5e | 638 | |
28bf096c PA |
639 | /* If the infcall does NOT succeed, normal_stop will have already |
640 | finished the thread states. However, on success, normal_stop | |
641 | defers here, so that we can set back the thread states to what | |
642 | they were before the call. Note that we must also finish the | |
643 | state of new threads that might have spawned while the call was | |
644 | running. The main cases to handle are: | |
645 | ||
646 | - "(gdb) print foo ()", or any other command that evaluates an | |
647 | expression at the prompt. (The thread was marked stopped before.) | |
648 | ||
649 | - "(gdb) break foo if return_false()" or similar cases where we | |
650 | do an infcall while handling an event (while the thread is still | |
651 | marked running). In this example, whether the condition | |
652 | evaluates true and thus we'll present a user-visible stop is | |
653 | decided elsewhere. */ | |
654 | if (!was_running | |
00431a78 | 655 | && call_thread_ptid == inferior_ptid |
28bf096c PA |
656 | && stop_stack_dummy == STOP_STACK_DUMMY) |
657 | finish_thread_state (user_visible_resume_ptid (0)); | |
658 | ||
b89667eb DE |
659 | enable_watchpoints_after_interactive_call_stop (); |
660 | ||
661 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
662 | of inferior call thread. | |
663 | If all error()s out of proceed ended up calling normal_stop | |
664 | (and perhaps they should; it already does in the special case | |
665 | of error out of resume()), then we wouldn't need this. */ | |
492d29ea | 666 | if (caught_error.reason < 0) |
b89667eb | 667 | { |
00431a78 | 668 | if (call_thread->state != THREAD_EXITED) |
16c381f0 | 669 | breakpoint_auto_delete (call_thread->control.stop_bpstat); |
b89667eb DE |
670 | } |
671 | ||
00431a78 | 672 | call_thread->control.in_infcall = saved_in_infcall; |
c5a4d20b | 673 | |
492d29ea | 674 | return caught_error; |
b89667eb DE |
675 | } |
676 | ||
aa7d318d TT |
677 | /* A cleanup function that calls delete_std_terminate_breakpoint. */ |
678 | static void | |
679 | cleanup_delete_std_terminate_breakpoint (void *ignore) | |
680 | { | |
681 | delete_std_terminate_breakpoint (); | |
682 | } | |
683 | ||
ed12ef62 JK |
684 | /* See infcall.h. */ |
685 | ||
686 | struct value * | |
7022349d PA |
687 | call_function_by_hand (struct value *function, |
688 | type *default_return_type, | |
689 | int nargs, struct value **args) | |
ed12ef62 | 690 | { |
7022349d PA |
691 | return call_function_by_hand_dummy (function, default_return_type, |
692 | nargs, args, NULL, NULL); | |
ed12ef62 JK |
693 | } |
694 | ||
04714b91 AC |
695 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
696 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
697 | frame which looks just like a real frame is so that if you call a | |
698 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
699 | will look right. Whether the backtrace needs to actually show the | |
700 | stack at the time the inferior function was called is debatable, but | |
701 | it certainly needs to not display garbage. So if you are contemplating | |
702 | making dummy frames be different from normal frames, consider that. */ | |
703 | ||
704 | /* Perform a function call in the inferior. | |
705 | ARGS is a vector of values of arguments (NARGS of them). | |
706 | FUNCTION is a value, the function to be called. | |
707 | Returns a value representing what the function returned. | |
708 | May fail to return, if a breakpoint or signal is hit | |
709 | during the execution of the function. | |
710 | ||
1777feb0 | 711 | ARGS is modified to contain coerced values. */ |
04714b91 AC |
712 | |
713 | struct value * | |
ed12ef62 | 714 | call_function_by_hand_dummy (struct value *function, |
7022349d | 715 | type *default_return_type, |
ed12ef62 | 716 | int nargs, struct value **args, |
558e5469 | 717 | dummy_frame_dtor_ftype *dummy_dtor, |
ed12ef62 | 718 | void *dummy_dtor_data) |
04714b91 | 719 | { |
52f0bd74 | 720 | CORE_ADDR sp; |
8388016d | 721 | struct type *target_values_type; |
18648a37 | 722 | unsigned char struct_return = 0, hidden_first_param_p = 0; |
04714b91 | 723 | CORE_ADDR struct_addr = 0; |
16c381f0 | 724 | struct infcall_control_state *inf_status; |
04714b91 | 725 | struct cleanup *inf_status_cleanup; |
16c381f0 | 726 | struct infcall_suspend_state *caller_state; |
04714b91 | 727 | CORE_ADDR real_pc; |
d585e13a | 728 | CORE_ADDR bp_addr; |
96860204 | 729 | struct frame_id dummy_id; |
0b9dfe2b MD |
730 | struct frame_info *frame; |
731 | struct gdbarch *gdbarch; | |
aa7d318d | 732 | struct cleanup *terminate_bp_cleanup; |
b89667eb DE |
733 | ptid_t call_thread_ptid; |
734 | struct gdb_exception e; | |
b89667eb | 735 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; |
04714b91 | 736 | |
04714b91 AC |
737 | if (!target_has_execution) |
738 | noprocess (); | |
739 | ||
573cda03 SS |
740 | if (get_traceframe_number () >= 0) |
741 | error (_("May not call functions while looking at trace frames.")); | |
742 | ||
949dc678 | 743 | if (execution_direction == EXEC_REVERSE) |
c2949be0 | 744 | error (_("Cannot call functions in reverse mode.")); |
949dc678 | 745 | |
00431a78 PA |
746 | /* We're going to run the target, and inspect the thread's state |
747 | afterwards. Hold a strong reference so that the pointer remains | |
748 | valid even if the thread exits. */ | |
749 | thread_info_ref call_thread | |
750 | = thread_info_ref::new_reference (inferior_thread ()); | |
751 | ||
752 | bool stack_temporaries = thread_stack_temporaries_enabled_p (call_thread.get ()); | |
753 | ||
0b9dfe2b MD |
754 | frame = get_current_frame (); |
755 | gdbarch = get_frame_arch (frame); | |
756 | ||
757 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 758 | error (_("This target does not support function calls.")); |
a86c5fc9 | 759 | |
b89667eb DE |
760 | /* A cleanup for the inferior status. |
761 | This is only needed while we're preparing the inferior function call. */ | |
16c381f0 JK |
762 | inf_status = save_infcall_control_state (); |
763 | inf_status_cleanup | |
764 | = make_cleanup_restore_infcall_control_state (inf_status); | |
04714b91 | 765 | |
b89667eb DE |
766 | /* Save the caller's registers and other state associated with the |
767 | inferior itself so that they can be restored once the | |
96860204 AC |
768 | callee returns. To allow nested calls the registers are (further |
769 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
770 | is tossed once the regcache has been pushed). */ | |
16c381f0 JK |
771 | caller_state = save_infcall_suspend_state (); |
772 | make_cleanup_restore_infcall_suspend_state (caller_state); | |
04714b91 | 773 | |
04714b91 | 774 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 775 | { |
0b9dfe2b | 776 | CORE_ADDR old_sp = get_frame_sp (frame); |
abbb1732 | 777 | |
0b9dfe2b | 778 | if (gdbarch_frame_align_p (gdbarch)) |
ebc7896c | 779 | { |
0b9dfe2b | 780 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
781 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
782 | ABIs, a function can use memory beyond the inner most stack | |
783 | address. AMD64 called that region the "red zone". Skip at | |
784 | least the "red zone" size before allocating any space on | |
785 | the stack. */ | |
0b9dfe2b MD |
786 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
787 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 788 | else |
0b9dfe2b | 789 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 790 | /* Still aligned? */ |
0b9dfe2b | 791 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
792 | /* NOTE: cagney/2002-09-18: |
793 | ||
794 | On a RISC architecture, a void parameterless generic dummy | |
795 | frame (i.e., no parameters, no result) typically does not | |
796 | need to push anything the stack and hence can leave SP and | |
c48a845b | 797 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
798 | not push anything on the stack and, hence, that too can |
799 | leave FP and SP unchanged. As a consequence, a sequence of | |
800 | void parameterless generic dummy frame calls to frameless | |
801 | functions will create a sequence of effectively identical | |
802 | frames (SP, FP and TOS and PC the same). This, not | |
803 | suprisingly, results in what appears to be a stack in an | |
804 | infinite loop --- when GDB tries to find a generic dummy | |
805 | frame on the internal dummy frame stack, it will always | |
806 | find the first one. | |
807 | ||
808 | To avoid this problem, the code below always grows the | |
809 | stack. That way, two dummy frames can never be identical. | |
810 | It does burn a few bytes of stack but that is a small price | |
811 | to pay :-). */ | |
ebc7896c AC |
812 | if (sp == old_sp) |
813 | { | |
0b9dfe2b | 814 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 815 | /* Stack grows down. */ |
0b9dfe2b | 816 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
817 | else |
818 | /* Stack grows up. */ | |
0b9dfe2b | 819 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 820 | } |
0e095b7e JK |
821 | /* SP may have underflown address zero here from OLD_SP. Memory access |
822 | functions will probably fail in such case but that is a target's | |
823 | problem. */ | |
ebc7896c AC |
824 | } |
825 | else | |
a59fe496 AC |
826 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
827 | ||
8b148df9 AC |
828 | Who knows how badly aligned the SP is! |
829 | ||
830 | If the generic dummy frame ends up empty (because nothing is | |
831 | pushed) GDB won't be able to correctly perform back traces. | |
832 | If a target is having trouble with backtraces, first thing to | |
1777feb0 | 833 | do is add FRAME_ALIGN() to the architecture vector. If that |
669fac23 | 834 | fails, try dummy_id(). |
8b148df9 AC |
835 | |
836 | If the ABI specifies a "Red Zone" (see the doco) the code | |
837 | below will quietly trash it. */ | |
ebc7896c | 838 | sp = old_sp; |
6c659fc2 SC |
839 | |
840 | /* Skip over the stack temporaries that might have been generated during | |
841 | the evaluation of an expression. */ | |
842 | if (stack_temporaries) | |
843 | { | |
844 | struct value *lastval; | |
845 | ||
00431a78 | 846 | lastval = get_last_thread_stack_temporary (call_thread.get ()); |
6c659fc2 SC |
847 | if (lastval != NULL) |
848 | { | |
849 | CORE_ADDR lastval_addr = value_address (lastval); | |
850 | ||
851 | if (gdbarch_inner_than (gdbarch, 1, 2)) | |
852 | { | |
853 | gdb_assert (sp >= lastval_addr); | |
854 | sp = lastval_addr; | |
855 | } | |
856 | else | |
857 | { | |
858 | gdb_assert (sp <= lastval_addr); | |
859 | sp = lastval_addr + TYPE_LENGTH (value_type (lastval)); | |
860 | } | |
861 | ||
862 | if (gdbarch_frame_align_p (gdbarch)) | |
863 | sp = gdbarch_frame_align (gdbarch, sp); | |
864 | } | |
865 | } | |
ebc7896c | 866 | } |
04714b91 | 867 | |
8388016d PA |
868 | type *ftype; |
869 | type *values_type; | |
870 | CORE_ADDR funaddr = find_function_addr (function, &values_type, &ftype); | |
871 | ||
7022349d PA |
872 | if (values_type == NULL) |
873 | values_type = default_return_type; | |
874 | if (values_type == NULL) | |
875 | { | |
876 | const char *name = get_function_name (funaddr, | |
877 | name_buf, sizeof (name_buf)); | |
878 | error (_("'%s' has unknown return type; " | |
879 | "cast the call to its declared return type"), | |
880 | name); | |
881 | } | |
7788af6d | 882 | |
f168693b | 883 | values_type = check_typedef (values_type); |
04714b91 | 884 | |
41f1b697 DJ |
885 | /* Are we returning a value using a structure return (passing a |
886 | hidden argument pointing to storage) or a normal value return? | |
887 | There are two cases: language-mandated structure return and | |
888 | target ABI structure return. The variable STRUCT_RETURN only | |
889 | describes the latter. The language version is handled by passing | |
890 | the return location as the first parameter to the function, | |
891 | even preceding "this". This is different from the target | |
892 | ABI version, which is target-specific; for instance, on ia64 | |
893 | the first argument is passed in out0 but the hidden structure | |
894 | return pointer would normally be passed in r8. */ | |
895 | ||
18648a37 | 896 | if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type)) |
41f1b697 | 897 | { |
18648a37 | 898 | hidden_first_param_p = 1; |
04714b91 | 899 | |
41f1b697 DJ |
900 | /* Tell the target specific argument pushing routine not to |
901 | expect a value. */ | |
48319d1f | 902 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
903 | } |
904 | else | |
905 | { | |
6a3a010b | 906 | struct_return = using_struct_return (gdbarch, function, values_type); |
41f1b697 DJ |
907 | target_values_type = values_type; |
908 | } | |
04714b91 | 909 | |
76727919 | 910 | gdb::observers::inferior_call_pre.notify (inferior_ptid, funaddr); |
162078c8 | 911 | |
7043d8dc AC |
912 | /* Determine the location of the breakpoint (and possibly other |
913 | stuff) that the called function will return to. The SPARC, for a | |
914 | function returning a structure or union, needs to make space for | |
915 | not just the breakpoint but also an extra word containing the | |
916 | size (?) of the structure being passed. */ | |
917 | ||
0b9dfe2b | 918 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
919 | { |
920 | case ON_STACK: | |
a14dd77e JK |
921 | { |
922 | const gdb_byte *bp_bytes; | |
923 | CORE_ADDR bp_addr_as_address; | |
924 | int bp_size; | |
925 | ||
926 | /* Be careful BP_ADDR is in inferior PC encoding while | |
927 | BP_ADDR_AS_ADDRESS is a plain memory address. */ | |
928 | ||
929 | sp = push_dummy_code (gdbarch, sp, funaddr, args, nargs, | |
930 | target_values_type, &real_pc, &bp_addr, | |
931 | get_current_regcache ()); | |
932 | ||
933 | /* Write a legitimate instruction at the point where the infcall | |
934 | breakpoint is going to be inserted. While this instruction | |
935 | is never going to be executed, a user investigating the | |
936 | memory from GDB would see this instruction instead of random | |
937 | uninitialized bytes. We chose the breakpoint instruction | |
938 | as it may look as the most logical one to the user and also | |
939 | valgrind 3.7.0 needs it for proper vgdb inferior calls. | |
940 | ||
941 | If software breakpoints are unsupported for this target we | |
942 | leave the user visible memory content uninitialized. */ | |
943 | ||
944 | bp_addr_as_address = bp_addr; | |
945 | bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address, | |
946 | &bp_size); | |
947 | if (bp_bytes != NULL) | |
948 | write_memory (bp_addr_as_address, bp_bytes, bp_size); | |
949 | } | |
7043d8dc | 950 | break; |
5931a2fa JK |
951 | case AT_ENTRY_POINT: |
952 | { | |
953 | CORE_ADDR dummy_addr; | |
954 | ||
955 | real_pc = funaddr; | |
956 | dummy_addr = entry_point_address (); | |
a14dd77e | 957 | |
5931a2fa | 958 | /* A call dummy always consists of just a single breakpoint, so |
a14dd77e JK |
959 | its address is the same as the address of the dummy. |
960 | ||
961 | The actual breakpoint is inserted separatly so there is no need to | |
962 | write that out. */ | |
5931a2fa JK |
963 | bp_addr = dummy_addr; |
964 | break; | |
965 | } | |
04714b91 | 966 | default: |
e2e0b3e5 | 967 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
968 | } |
969 | ||
04714b91 | 970 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 971 | error (_("Too few arguments in function call.")); |
04714b91 | 972 | |
ebc7896c AC |
973 | { |
974 | int i; | |
abbb1732 | 975 | |
ebc7896c AC |
976 | for (i = nargs - 1; i >= 0; i--) |
977 | { | |
978 | int prototyped; | |
979 | struct type *param_type; | |
980 | ||
981 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
982 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
983 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
984 | prototyped = 1; | |
7022349d PA |
985 | if (TYPE_TARGET_TYPE (ftype) == NULL && TYPE_NFIELDS (ftype) == 0 |
986 | && default_return_type != NULL) | |
987 | { | |
988 | /* Calling a no-debug function with the return type | |
989 | explicitly cast. Assume the function is prototyped, | |
990 | with a prototype matching the types of the arguments. | |
991 | E.g., with: | |
992 | float mult (float v1, float v2) { return v1 * v2; } | |
993 | This: | |
994 | (gdb) p (float) mult (2.0f, 3.0f) | |
995 | Is a simpler alternative to: | |
996 | (gdb) p ((float (*) (float, float)) mult) (2.0f, 3.0f) | |
997 | */ | |
998 | prototyped = 1; | |
999 | } | |
ebc7896c AC |
1000 | else if (i < TYPE_NFIELDS (ftype)) |
1001 | prototyped = TYPE_PROTOTYPED (ftype); | |
1002 | else | |
1003 | prototyped = 0; | |
1004 | ||
1005 | if (i < TYPE_NFIELDS (ftype)) | |
1006 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
1007 | else | |
1008 | param_type = NULL; | |
41f1b697 | 1009 | |
7788af6d UW |
1010 | args[i] = value_arg_coerce (gdbarch, args[i], |
1011 | param_type, prototyped, &sp); | |
ebc7896c | 1012 | |
41f1b697 DJ |
1013 | if (param_type != NULL && language_pass_by_reference (param_type)) |
1014 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
1015 | } |
1016 | } | |
04714b91 | 1017 | |
04714b91 AC |
1018 | /* Reserve space for the return structure to be written on the |
1019 | stack, if necessary. Make certain that the value is correctly | |
6c659fc2 SC |
1020 | aligned. |
1021 | ||
1022 | While evaluating expressions, we reserve space on the stack for | |
1023 | return values of class type even if the language ABI and the target | |
1024 | ABI do not require that the return value be passed as a hidden first | |
1025 | argument. This is because we want to store the return value as an | |
1026 | on-stack temporary while the expression is being evaluated. This | |
1027 | enables us to have chained function calls in expressions. | |
04714b91 | 1028 | |
6c659fc2 SC |
1029 | Keeping the return values as on-stack temporaries while the expression |
1030 | is being evaluated is OK because the thread is stopped until the | |
1031 | expression is completely evaluated. */ | |
1032 | ||
1033 | if (struct_return || hidden_first_param_p | |
1034 | || (stack_temporaries && class_or_union_p (values_type))) | |
04714b91 | 1035 | { |
0b9dfe2b | 1036 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
1037 | { |
1038 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
1039 | making space for the return value. */ | |
744a8059 | 1040 | sp -= TYPE_LENGTH (values_type); |
0b9dfe2b MD |
1041 | if (gdbarch_frame_align_p (gdbarch)) |
1042 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
1043 | struct_addr = sp; |
1044 | } | |
1045 | else | |
1046 | { | |
1047 | /* Stack grows upward. Align the frame, allocate space, and | |
1777feb0 | 1048 | then again, re-align the frame??? */ |
0b9dfe2b MD |
1049 | if (gdbarch_frame_align_p (gdbarch)) |
1050 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 | 1051 | struct_addr = sp; |
744a8059 | 1052 | sp += TYPE_LENGTH (values_type); |
0b9dfe2b MD |
1053 | if (gdbarch_frame_align_p (gdbarch)) |
1054 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
1055 | } |
1056 | } | |
1057 | ||
6ccb583f | 1058 | std::vector<struct value *> new_args; |
18648a37 | 1059 | if (hidden_first_param_p) |
41f1b697 | 1060 | { |
41f1b697 | 1061 | /* Add the new argument to the front of the argument list. */ |
6ccb583f TT |
1062 | new_args.push_back |
1063 | (value_from_pointer (lookup_pointer_type (values_type), struct_addr)); | |
1064 | std::copy (&args[0], &args[nargs], std::back_inserter (new_args)); | |
1065 | args = new_args.data (); | |
41f1b697 | 1066 | nargs++; |
41f1b697 | 1067 | } |
41f1b697 | 1068 | |
04714b91 AC |
1069 | /* Create the dummy stack frame. Pass in the call dummy address as, |
1070 | presumably, the ABI code knows where, in the call dummy, the | |
1071 | return address should be pointed. */ | |
0b9dfe2b MD |
1072 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
1073 | bp_addr, nargs, args, | |
594f7785 | 1074 | sp, struct_return, struct_addr); |
04714b91 | 1075 | |
96860204 AC |
1076 | /* Set up a frame ID for the dummy frame so we can pass it to |
1077 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
1078 | ID so that the breakpoint code can correctly re-identify the | |
1079 | dummy breakpoint. */ | |
8241eaa6 | 1080 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 1081 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 1082 | the frame ID's stack address. */ |
96860204 | 1083 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 1084 | |
74cfe982 AC |
1085 | /* Create a momentary breakpoint at the return address of the |
1086 | inferior. That way it breaks when it returns. */ | |
04714b91 | 1087 | |
74cfe982 | 1088 | { |
51abb421 | 1089 | symtab_and_line sal; |
6c95b8df | 1090 | sal.pspace = current_program_space; |
74cfe982 AC |
1091 | sal.pc = bp_addr; |
1092 | sal.section = find_pc_overlay (sal.pc); | |
51abb421 | 1093 | |
8241eaa6 AC |
1094 | /* Sanity. The exact same SP value is returned by |
1095 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 1096 | dummy_id to form the frame ID's stack address. */ |
454dafbd TT |
1097 | breakpoint *bpt |
1098 | = set_momentary_breakpoint (gdbarch, sal, | |
1099 | dummy_id, bp_call_dummy).release (); | |
c70a6932 JK |
1100 | |
1101 | /* set_momentary_breakpoint invalidates FRAME. */ | |
1102 | frame = NULL; | |
1103 | ||
74cfe982 | 1104 | bpt->disposition = disp_del; |
e2e4d78b JK |
1105 | gdb_assert (bpt->related_breakpoint == bpt); |
1106 | ||
51abb421 | 1107 | breakpoint *longjmp_b = set_longjmp_breakpoint_for_call_dummy (); |
e2e4d78b JK |
1108 | if (longjmp_b) |
1109 | { | |
1110 | /* Link BPT into the chain of LONGJMP_B. */ | |
1111 | bpt->related_breakpoint = longjmp_b; | |
1112 | while (longjmp_b->related_breakpoint != bpt->related_breakpoint) | |
1113 | longjmp_b = longjmp_b->related_breakpoint; | |
1114 | longjmp_b->related_breakpoint = bpt; | |
1115 | } | |
74cfe982 | 1116 | } |
04714b91 | 1117 | |
7cd1089b PM |
1118 | /* Create a breakpoint in std::terminate. |
1119 | If a C++ exception is raised in the dummy-frame, and the | |
1120 | exception handler is (normally, and expected to be) out-of-frame, | |
1121 | the default C++ handler will (wrongly) be called in an inferior | |
1122 | function call. This is wrong, as an exception can be normally | |
1123 | and legally handled out-of-frame. The confines of the dummy frame | |
1124 | prevent the unwinder from finding the correct handler (or any | |
1125 | handler, unless it is in-frame). The default handler calls | |
1126 | std::terminate. This will kill the inferior. Assert that | |
1127 | terminate should never be called in an inferior function | |
1128 | call. Place a momentary breakpoint in the std::terminate function | |
1129 | and if triggered in the call, rewind. */ | |
1130 | if (unwind_on_terminating_exception_p) | |
aa7d318d | 1131 | set_std_terminate_breakpoint (); |
7cd1089b | 1132 | |
8a6c4031 JK |
1133 | /* Discard both inf_status and caller_state cleanups. |
1134 | From this point on we explicitly restore the associated state | |
1135 | or discard it. */ | |
1136 | discard_cleanups (inf_status_cleanup); | |
1137 | ||
96860204 AC |
1138 | /* Everything's ready, push all the info needed to restore the |
1139 | caller (and identify the dummy-frame) onto the dummy-frame | |
1140 | stack. */ | |
00431a78 | 1141 | dummy_frame_push (caller_state, &dummy_id, call_thread.get ()); |
ed12ef62 | 1142 | if (dummy_dtor != NULL) |
00431a78 | 1143 | register_dummy_frame_dtor (dummy_id, call_thread.get (), |
ed12ef62 | 1144 | dummy_dtor, dummy_dtor_data); |
b89667eb | 1145 | |
7cd1089b | 1146 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
aa7d318d TT |
1147 | terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, |
1148 | NULL); | |
7cd1089b | 1149 | |
96860204 AC |
1150 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
1151 | If you're looking to implement asynchronous dummy-frames, then | |
1152 | just below is the place to chop this function in two.. */ | |
1153 | ||
74cfe982 | 1154 | { |
388a7084 PA |
1155 | struct thread_fsm *saved_sm; |
1156 | struct call_thread_fsm *sm; | |
1157 | ||
1158 | /* Save the current FSM. We'll override it. */ | |
00431a78 PA |
1159 | saved_sm = call_thread->thread_fsm; |
1160 | call_thread->thread_fsm = NULL; | |
74cfe982 | 1161 | |
b89667eb DE |
1162 | /* Save this thread's ptid, we need it later but the thread |
1163 | may have exited. */ | |
00431a78 | 1164 | call_thread_ptid = call_thread->ptid; |
74cfe982 | 1165 | |
b89667eb | 1166 | /* Run the inferior until it stops. */ |
f5871ec0 | 1167 | |
388a7084 PA |
1168 | /* Create the FSM used to manage the infcall. It tells infrun to |
1169 | not report the stop to the user, and captures the return value | |
1170 | before the dummy frame is popped. run_inferior_call registers | |
1171 | it with the thread ASAP. */ | |
8980e177 | 1172 | sm = new_call_thread_fsm (current_ui, command_interp (), |
3b12939d | 1173 | gdbarch, function, |
388a7084 PA |
1174 | values_type, |
1175 | struct_return || hidden_first_param_p, | |
1176 | struct_addr); | |
1177 | ||
00431a78 | 1178 | e = run_inferior_call (sm, call_thread.get (), real_pc); |
388a7084 | 1179 | |
76727919 | 1180 | gdb::observers::inferior_call_post.notify (call_thread_ptid, funaddr); |
388a7084 | 1181 | |
00431a78 | 1182 | if (call_thread->state != THREAD_EXITED) |
388a7084 PA |
1183 | { |
1184 | /* The FSM should still be the same. */ | |
00431a78 | 1185 | gdb_assert (call_thread->thread_fsm == &sm->thread_fsm); |
388a7084 | 1186 | |
00431a78 | 1187 | if (thread_fsm_finished_p (call_thread->thread_fsm)) |
388a7084 PA |
1188 | { |
1189 | struct value *retval; | |
1190 | ||
1191 | /* The inferior call is successful. Pop the dummy frame, | |
1192 | which runs its destructors and restores the inferior's | |
1193 | suspend state, and restore the inferior control | |
1194 | state. */ | |
00431a78 | 1195 | dummy_frame_pop (dummy_id, call_thread.get ()); |
388a7084 PA |
1196 | restore_infcall_control_state (inf_status); |
1197 | ||
1198 | /* Get the return value. */ | |
1199 | retval = sm->return_value; | |
1200 | ||
1201 | /* Clean up / destroy the call FSM, and restore the | |
1202 | original one. */ | |
00431a78 PA |
1203 | thread_fsm_clean_up (call_thread->thread_fsm, call_thread.get ()); |
1204 | thread_fsm_delete (call_thread->thread_fsm); | |
1205 | call_thread->thread_fsm = saved_sm; | |
04714b91 | 1206 | |
388a7084 PA |
1207 | maybe_remove_breakpoints (); |
1208 | ||
1209 | do_cleanups (terminate_bp_cleanup); | |
1210 | gdb_assert (retval != NULL); | |
1211 | return retval; | |
1212 | } | |
1213 | ||
1214 | /* Didn't complete. Restore previous state machine, and | |
1215 | handle the error. */ | |
00431a78 | 1216 | call_thread->thread_fsm = saved_sm; |
388a7084 PA |
1217 | } |
1218 | } | |
162078c8 | 1219 | |
b89667eb DE |
1220 | /* Rethrow an error if we got one trying to run the inferior. */ |
1221 | ||
1222 | if (e.reason < 0) | |
1223 | { | |
1224 | const char *name = get_function_name (funaddr, | |
1225 | name_buf, sizeof (name_buf)); | |
1226 | ||
16c381f0 | 1227 | discard_infcall_control_state (inf_status); |
b89667eb DE |
1228 | |
1229 | /* We could discard the dummy frame here if the program exited, | |
1230 | but it will get garbage collected the next time the program is | |
1231 | run anyway. */ | |
1232 | ||
1233 | switch (e.reason) | |
1234 | { | |
1235 | case RETURN_ERROR: | |
ac74f770 MS |
1236 | throw_error (e.error, _("%s\n\ |
1237 | An error occurred while in a function called from GDB.\n\ | |
1238 | Evaluation of the expression containing the function\n\ | |
1239 | (%s) will be abandoned.\n\ | |
1240 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
1241 | e.message, name); |
1242 | case RETURN_QUIT: | |
1243 | default: | |
1244 | throw_exception (e); | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | /* If the program has exited, or we stopped at a different thread, | |
1249 | exit and inform the user. */ | |
1250 | ||
de04a248 DE |
1251 | if (! target_has_execution) |
1252 | { | |
b89667eb DE |
1253 | const char *name = get_function_name (funaddr, |
1254 | name_buf, sizeof (name_buf)); | |
1255 | ||
1256 | /* If we try to restore the inferior status, | |
de04a248 | 1257 | we'll crash as the inferior is no longer running. */ |
16c381f0 | 1258 | discard_infcall_control_state (inf_status); |
b89667eb DE |
1259 | |
1260 | /* We could discard the dummy frame here given that the program exited, | |
1261 | but it will get garbage collected the next time the program is | |
1262 | run anyway. */ | |
1263 | ||
3e43a32a MS |
1264 | error (_("The program being debugged exited while in a function " |
1265 | "called from GDB.\n" | |
1266 | "Evaluation of the expression containing the function\n" | |
1267 | "(%s) will be abandoned."), | |
b89667eb DE |
1268 | name); |
1269 | } | |
1270 | ||
d7e15655 | 1271 | if (call_thread_ptid != inferior_ptid) |
b89667eb DE |
1272 | { |
1273 | const char *name = get_function_name (funaddr, | |
1274 | name_buf, sizeof (name_buf)); | |
1275 | ||
1276 | /* We've switched threads. This can happen if another thread gets a | |
1277 | signal or breakpoint while our thread was running. | |
1278 | There's no point in restoring the inferior status, | |
1279 | we're in a different thread. */ | |
16c381f0 | 1280 | discard_infcall_control_state (inf_status); |
b89667eb DE |
1281 | /* Keep the dummy frame record, if the user switches back to the |
1282 | thread with the hand-call, we'll need it. */ | |
1283 | if (stopped_by_random_signal) | |
ac74f770 MS |
1284 | error (_("\ |
1285 | The program received a signal in another thread while\n\ | |
1286 | making a function call from GDB.\n\ | |
1287 | Evaluation of the expression containing the function\n\ | |
1288 | (%s) will be abandoned.\n\ | |
1289 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
1290 | name); |
1291 | else | |
ac74f770 MS |
1292 | error (_("\ |
1293 | The program stopped in another thread while making a function call from GDB.\n\ | |
1294 | Evaluation of the expression containing the function\n\ | |
1295 | (%s) will be abandoned.\n\ | |
1296 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 1297 | name); |
de04a248 DE |
1298 | } |
1299 | ||
52557533 | 1300 | { |
5fe75eec | 1301 | /* Make a copy as NAME may be in an objfile freed by dummy_frame_pop. */ |
395423c4 TT |
1302 | std::string name = get_function_name (funaddr, name_buf, |
1303 | sizeof (name_buf)); | |
b89667eb | 1304 | |
52557533 AC |
1305 | if (stopped_by_random_signal) |
1306 | { | |
1307 | /* We stopped inside the FUNCTION because of a random | |
1308 | signal. Further execution of the FUNCTION is not | |
1777feb0 | 1309 | allowed. */ |
04714b91 | 1310 | |
52557533 AC |
1311 | if (unwind_on_signal_p) |
1312 | { | |
1777feb0 | 1313 | /* The user wants the context restored. */ |
52557533 AC |
1314 | |
1315 | /* We must get back to the frame we were before the | |
b89667eb | 1316 | dummy call. */ |
00431a78 | 1317 | dummy_frame_pop (dummy_id, call_thread.get ()); |
b89667eb DE |
1318 | |
1319 | /* We also need to restore inferior status to that before the | |
1320 | dummy call. */ | |
16c381f0 | 1321 | restore_infcall_control_state (inf_status); |
04714b91 | 1322 | |
52557533 AC |
1323 | /* FIXME: Insert a bunch of wrap_here; name can be very |
1324 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1325 | error (_("\ |
1326 | The program being debugged was signaled while in a function called from GDB.\n\ | |
1327 | GDB has restored the context to what it was before the call.\n\ | |
1328 | To change this behavior use \"set unwindonsignal off\".\n\ | |
1329 | Evaluation of the expression containing the function\n\ | |
1330 | (%s) will be abandoned."), | |
395423c4 | 1331 | name.c_str ()); |
52557533 AC |
1332 | } |
1333 | else | |
1334 | { | |
1335 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
1336 | (default). |
1337 | Discard inferior status, we're not at the same point | |
1338 | we started at. */ | |
16c381f0 | 1339 | discard_infcall_control_state (inf_status); |
b89667eb | 1340 | |
52557533 AC |
1341 | /* FIXME: Insert a bunch of wrap_here; name can be very |
1342 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1343 | error (_("\ |
1344 | The program being debugged was signaled while in a function called from GDB.\n\ | |
1345 | GDB remains in the frame where the signal was received.\n\ | |
1346 | To change this behavior use \"set unwindonsignal on\".\n\ | |
1347 | Evaluation of the expression containing the function\n\ | |
1348 | (%s) will be abandoned.\n\ | |
1349 | When the function is done executing, GDB will silently stop."), | |
395423c4 | 1350 | name.c_str ()); |
52557533 AC |
1351 | } |
1352 | } | |
04714b91 | 1353 | |
aa7d318d | 1354 | if (stop_stack_dummy == STOP_STD_TERMINATE) |
52557533 | 1355 | { |
aa7d318d TT |
1356 | /* We must get back to the frame we were before the dummy |
1357 | call. */ | |
00431a78 | 1358 | dummy_frame_pop (dummy_id, call_thread.get ()); |
7cd1089b | 1359 | |
aa7d318d TT |
1360 | /* We also need to restore inferior status to that before |
1361 | the dummy call. */ | |
16c381f0 | 1362 | restore_infcall_control_state (inf_status); |
aa7d318d | 1363 | |
ac74f770 MS |
1364 | error (_("\ |
1365 | The program being debugged entered a std::terminate call, most likely\n\ | |
1366 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
1367 | to prevent the program from being terminated, and has restored the\n\ | |
1368 | context to its original state before the call.\n\ | |
1369 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
1370 | Evaluation of the expression containing the function (%s)\n\ | |
1371 | will be abandoned."), | |
395423c4 | 1372 | name.c_str ()); |
aa7d318d TT |
1373 | } |
1374 | else if (stop_stack_dummy == STOP_NONE) | |
1375 | { | |
1376 | ||
b89667eb DE |
1377 | /* We hit a breakpoint inside the FUNCTION. |
1378 | Keep the dummy frame, the user may want to examine its state. | |
1379 | Discard inferior status, we're not at the same point | |
1380 | we started at. */ | |
16c381f0 | 1381 | discard_infcall_control_state (inf_status); |
b89667eb | 1382 | |
52557533 AC |
1383 | /* The following error message used to say "The expression |
1384 | which contained the function call has been discarded." | |
1385 | It is a hard concept to explain in a few words. Ideally, | |
1386 | GDB would be able to resume evaluation of the expression | |
1387 | when the function finally is done executing. Perhaps | |
1388 | someday this will be implemented (it would not be easy). */ | |
1389 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
1390 | a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1391 | error (_("\ |
1392 | The program being debugged stopped while in a function called from GDB.\n\ | |
1393 | Evaluation of the expression containing the function\n\ | |
1394 | (%s) will be abandoned.\n\ | |
1395 | When the function is done executing, GDB will silently stop."), | |
395423c4 | 1396 | name.c_str ()); |
52557533 AC |
1397 | } |
1398 | ||
52557533 | 1399 | } |
04714b91 | 1400 | |
388a7084 PA |
1401 | /* The above code errors out, so ... */ |
1402 | gdb_assert_not_reached ("... should not be here"); | |
04714b91 | 1403 | } |
04714b91 AC |
1404 | |
1405 | void | |
1406 | _initialize_infcall (void) | |
1407 | { | |
1408 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1409 | &coerce_float_to_double_p, _("\ |
1410 | Set coercion of floats to doubles when calling functions."), _("\ | |
1411 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1412 | Variables of type float should generally be converted to doubles before\n\ |
1413 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1414 | function. However, some older debug info formats do not provide enough\n\ | |
1415 | information to determine that a function is prototyped. If this flag is\n\ | |
1416 | set, GDB will perform the conversion for a function it considers\n\ | |
1417 | unprototyped.\n\ | |
7915a72c | 1418 | The default is to perform the conversion.\n"), |
2c5b56ce | 1419 | NULL, |
920d2a44 | 1420 | show_coerce_float_to_double_p, |
2c5b56ce | 1421 | &setlist, &showlist); |
04714b91 AC |
1422 | |
1423 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1424 | &unwind_on_signal_p, _("\ |
1425 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1426 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1427 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1428 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1429 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1430 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1431 | NULL, |
920d2a44 | 1432 | show_unwind_on_signal_p, |
2c5b56ce | 1433 | &setlist, &showlist); |
7cd1089b PM |
1434 | |
1435 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1436 | &unwind_on_terminating_exception_p, _("\ | |
1437 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
3e43a32a MS |
1438 | Show unwinding of stack if std::terminate() is called while in a call dummy."), |
1439 | _("\ | |
7cd1089b PM |
1440 | The unwind on terminating exception flag lets the user determine\n\ |
1441 | what gdb should do if a std::terminate() call is made from the\n\ | |
1442 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1443 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1444 | std::terminate call to proceed.\n\ | |
1445 | The default is to unwind the frame."), | |
1446 | NULL, | |
1447 | show_unwind_on_terminating_exception_p, | |
1448 | &setlist, &showlist); | |
1449 | ||
04714b91 | 1450 | } |