Commit | Line | Data |
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04714b91 AC |
1 | /* Perform an inferior function call, for GDB, the GNU debugger. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 1986-2014 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" | |
21 | #include "breakpoint.h" | |
573cda03 | 22 | #include "tracepoint.h" |
04714b91 AC |
23 | #include "target.h" |
24 | #include "regcache.h" | |
25 | #include "inferior.h" | |
45741a9c | 26 | #include "infrun.h" |
04714b91 AC |
27 | #include "block.h" |
28 | #include "gdbcore.h" | |
29 | #include "language.h" | |
9ab9195f | 30 | #include "objfiles.h" |
04714b91 AC |
31 | #include "gdbcmd.h" |
32 | #include "command.h" | |
b9362cc7 | 33 | #include "infcall.h" |
96860204 | 34 | #include "dummy-frame.h" |
a93c0eb6 | 35 | #include "ada-lang.h" |
347bddb7 | 36 | #include "gdbthread.h" |
beb460e8 | 37 | #include "event-top.h" |
b89667eb DE |
38 | |
39 | /* If we can't find a function's name from its address, | |
40 | we print this instead. */ | |
41 | #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" | |
42 | #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ | |
43 | + 2 * sizeof (CORE_ADDR)) | |
04714b91 AC |
44 | |
45 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
46 | ||
47 | GDB needs an asynchronous expression evaluator, that means an | |
48 | asynchronous inferior function call implementation, and that in | |
49 | turn means restructuring the code so that it is event driven. */ | |
50 | ||
51 | /* How you should pass arguments to a function depends on whether it | |
52 | was defined in K&R style or prototype style. If you define a | |
53 | function using the K&R syntax that takes a `float' argument, then | |
54 | callers must pass that argument as a `double'. If you define the | |
55 | function using the prototype syntax, then you must pass the | |
56 | argument as a `float', with no promotion. | |
57 | ||
58 | Unfortunately, on certain older platforms, the debug info doesn't | |
59 | indicate reliably how each function was defined. A function type's | |
60 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was | |
61 | defined in prototype style. When calling a function whose | |
62 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to | |
63 | decide what to do. | |
64 | ||
65 | For modern targets, it is proper to assume that, if the prototype | |
66 | flag is clear, that can be trusted: `float' arguments should be | |
67 | promoted to `double'. For some older targets, if the prototype | |
68 | flag is clear, that doesn't tell us anything. The default is to | |
69 | trust the debug information; the user can override this behavior | |
70 | with "set coerce-float-to-double 0". */ | |
71 | ||
72 | static int coerce_float_to_double_p = 1; | |
920d2a44 AC |
73 | static void |
74 | show_coerce_float_to_double_p (struct ui_file *file, int from_tty, | |
75 | struct cmd_list_element *c, const char *value) | |
76 | { | |
3e43a32a MS |
77 | fprintf_filtered (file, |
78 | _("Coercion of floats to doubles " | |
79 | "when calling functions is %s.\n"), | |
920d2a44 AC |
80 | value); |
81 | } | |
04714b91 AC |
82 | |
83 | /* This boolean tells what gdb should do if a signal is received while | |
84 | in a function called from gdb (call dummy). If set, gdb unwinds | |
85 | the stack and restore the context to what as it was before the | |
86 | call. | |
87 | ||
1777feb0 | 88 | The default is to stop in the frame where the signal was received. */ |
04714b91 | 89 | |
ef61f180 | 90 | static int unwind_on_signal_p = 0; |
920d2a44 AC |
91 | static void |
92 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, | |
93 | struct cmd_list_element *c, const char *value) | |
94 | { | |
3e43a32a MS |
95 | fprintf_filtered (file, |
96 | _("Unwinding of stack if a signal is " | |
97 | "received while in a call dummy is %s.\n"), | |
920d2a44 AC |
98 | value); |
99 | } | |
100 | ||
7cd1089b PM |
101 | /* This boolean tells what gdb should do if a std::terminate call is |
102 | made while in a function called from gdb (call dummy). | |
103 | As the confines of a single dummy stack prohibit out-of-frame | |
104 | handlers from handling a raised exception, and as out-of-frame | |
105 | handlers are common in C++, this can lead to no handler being found | |
106 | by the unwinder, and a std::terminate call. This is a false positive. | |
107 | If set, gdb unwinds the stack and restores the context to what it | |
108 | was before the call. | |
109 | ||
110 | The default is to unwind the frame if a std::terminate call is | |
111 | made. */ | |
112 | ||
113 | static int unwind_on_terminating_exception_p = 1; | |
114 | ||
115 | static void | |
116 | show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, | |
117 | struct cmd_list_element *c, | |
118 | const char *value) | |
119 | ||
120 | { | |
3e43a32a MS |
121 | fprintf_filtered (file, |
122 | _("Unwind stack if a C++ exception is " | |
123 | "unhandled while in a call dummy is %s.\n"), | |
7cd1089b PM |
124 | value); |
125 | } | |
04714b91 AC |
126 | |
127 | /* Perform the standard coercions that are specified | |
a93c0eb6 | 128 | for arguments to be passed to C or Ada functions. |
04714b91 AC |
129 | |
130 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
a93c0eb6 JB |
131 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
132 | SP is the stack pointer were additional data can be pushed (updating | |
133 | its value as needed). */ | |
04714b91 AC |
134 | |
135 | static struct value * | |
7788af6d UW |
136 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
137 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) | |
04714b91 | 138 | { |
7788af6d | 139 | const struct builtin_type *builtin = builtin_type (gdbarch); |
df407dfe | 140 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 141 | struct type *type |
04714b91 AC |
142 | = param_type ? check_typedef (param_type) : arg_type; |
143 | ||
a93c0eb6 JB |
144 | /* Perform any Ada-specific coercion first. */ |
145 | if (current_language->la_language == language_ada) | |
40bc484c | 146 | arg = ada_convert_actual (arg, type); |
a93c0eb6 | 147 | |
63092375 DJ |
148 | /* Force the value to the target if we will need its address. At |
149 | this point, we could allocate arguments on the stack instead of | |
150 | calling malloc if we knew that their addresses would not be | |
151 | saved by the called function. */ | |
152 | arg = value_coerce_to_target (arg); | |
153 | ||
04714b91 AC |
154 | switch (TYPE_CODE (type)) |
155 | { | |
156 | case TYPE_CODE_REF: | |
fb933624 DJ |
157 | { |
158 | struct value *new_value; | |
159 | ||
160 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) | |
b1af9e97 | 161 | return value_cast_pointers (type, arg, 0); |
fb933624 DJ |
162 | |
163 | /* Cast the value to the reference's target type, and then | |
164 | convert it back to a reference. This will issue an error | |
165 | if the value was not previously in memory - in some cases | |
166 | we should clearly be allowing this, but how? */ | |
167 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); | |
168 | new_value = value_ref (new_value); | |
169 | return new_value; | |
170 | } | |
04714b91 AC |
171 | case TYPE_CODE_INT: |
172 | case TYPE_CODE_CHAR: | |
173 | case TYPE_CODE_BOOL: | |
174 | case TYPE_CODE_ENUM: | |
175 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
176 | if (!is_prototyped) | |
177 | { | |
7788af6d UW |
178 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
179 | type = builtin->builtin_int; | |
04714b91 AC |
180 | } |
181 | /* Currently all target ABIs require at least the width of an integer | |
182 | type for an argument. We may have to conditionalize the following | |
183 | type coercion for future targets. */ | |
7788af6d UW |
184 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
185 | type = builtin->builtin_int; | |
04714b91 AC |
186 | break; |
187 | case TYPE_CODE_FLT: | |
188 | if (!is_prototyped && coerce_float_to_double_p) | |
189 | { | |
7788af6d UW |
190 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
191 | type = builtin->builtin_double; | |
192 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) | |
193 | type = builtin->builtin_long_double; | |
04714b91 AC |
194 | } |
195 | break; | |
196 | case TYPE_CODE_FUNC: | |
197 | type = lookup_pointer_type (type); | |
198 | break; | |
199 | case TYPE_CODE_ARRAY: | |
200 | /* Arrays are coerced to pointers to their first element, unless | |
201 | they are vectors, in which case we want to leave them alone, | |
202 | because they are passed by value. */ | |
203 | if (current_language->c_style_arrays) | |
204 | if (!TYPE_VECTOR (type)) | |
205 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
206 | break; | |
207 | case TYPE_CODE_UNDEF: | |
208 | case TYPE_CODE_PTR: | |
209 | case TYPE_CODE_STRUCT: | |
210 | case TYPE_CODE_UNION: | |
211 | case TYPE_CODE_VOID: | |
212 | case TYPE_CODE_SET: | |
213 | case TYPE_CODE_RANGE: | |
214 | case TYPE_CODE_STRING: | |
04714b91 | 215 | case TYPE_CODE_ERROR: |
0d5de010 DJ |
216 | case TYPE_CODE_MEMBERPTR: |
217 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
218 | case TYPE_CODE_METHOD: |
219 | case TYPE_CODE_COMPLEX: | |
220 | default: | |
221 | break; | |
222 | } | |
223 | ||
224 | return value_cast (type, arg); | |
225 | } | |
226 | ||
07be84bf JK |
227 | /* Return the return type of a function with its first instruction exactly at |
228 | the PC address. Return NULL otherwise. */ | |
229 | ||
230 | static struct type * | |
231 | find_function_return_type (CORE_ADDR pc) | |
232 | { | |
233 | struct symbol *sym = find_pc_function (pc); | |
234 | ||
235 | if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc | |
236 | && SYMBOL_TYPE (sym) != NULL) | |
237 | return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)); | |
238 | ||
239 | return NULL; | |
240 | } | |
241 | ||
04714b91 AC |
242 | /* Determine a function's address and its return type from its value. |
243 | Calls error() if the function is not valid for calling. */ | |
244 | ||
a9fa03de | 245 | CORE_ADDR |
04714b91 AC |
246 | find_function_addr (struct value *function, struct type **retval_type) |
247 | { | |
df407dfe | 248 | struct type *ftype = check_typedef (value_type (function)); |
50810684 | 249 | struct gdbarch *gdbarch = get_type_arch (ftype); |
7788af6d | 250 | struct type *value_type = NULL; |
09b58708 JK |
251 | /* Initialize it just to avoid a GCC false warning. */ |
252 | CORE_ADDR funaddr = 0; | |
04714b91 AC |
253 | |
254 | /* If it's a member function, just look at the function | |
255 | part of it. */ | |
256 | ||
257 | /* Determine address to call. */ | |
300f8e10 JK |
258 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
259 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
260 | funaddr = value_address (function); | |
261 | else if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
04714b91 AC |
262 | { |
263 | funaddr = value_as_address (function); | |
264 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
265 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
266 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
300f8e10 JK |
267 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
268 | ¤t_target); | |
04714b91 | 269 | } |
300f8e10 JK |
270 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
271 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
07be84bf JK |
272 | { |
273 | value_type = TYPE_TARGET_TYPE (ftype); | |
274 | ||
275 | if (TYPE_GNU_IFUNC (ftype)) | |
276 | { | |
277 | funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr); | |
278 | ||
279 | /* Skip querying the function symbol if no RETVAL_TYPE has been | |
280 | asked for. */ | |
281 | if (retval_type) | |
282 | value_type = find_function_return_type (funaddr); | |
283 | } | |
284 | } | |
300f8e10 | 285 | else if (TYPE_CODE (ftype) == TYPE_CODE_INT) |
04714b91 AC |
286 | { |
287 | /* Handle the case of functions lacking debugging info. | |
1777feb0 | 288 | Their values are characters since their addresses are char. */ |
04714b91 AC |
289 | if (TYPE_LENGTH (ftype) == 1) |
290 | funaddr = value_as_address (value_addr (function)); | |
291 | else | |
2bbe3cc1 DJ |
292 | { |
293 | /* Handle function descriptors lacking debug info. */ | |
294 | int found_descriptor = 0; | |
abbb1732 | 295 | |
87bc73ea | 296 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
297 | if (VALUE_LVAL (function) == lval_memory) |
298 | { | |
299 | CORE_ADDR nfunaddr; | |
abbb1732 | 300 | |
2bbe3cc1 DJ |
301 | funaddr = value_as_address (value_addr (function)); |
302 | nfunaddr = funaddr; | |
50810684 | 303 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
2bbe3cc1 DJ |
304 | ¤t_target); |
305 | if (funaddr != nfunaddr) | |
306 | found_descriptor = 1; | |
307 | } | |
308 | if (!found_descriptor) | |
309 | /* Handle integer used as address of a function. */ | |
310 | funaddr = (CORE_ADDR) value_as_long (function); | |
311 | } | |
04714b91 AC |
312 | } |
313 | else | |
8a3fe4f8 | 314 | error (_("Invalid data type for function to be called.")); |
04714b91 | 315 | |
7d9b040b RC |
316 | if (retval_type != NULL) |
317 | *retval_type = value_type; | |
50810684 | 318 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
04714b91 AC |
319 | } |
320 | ||
d3712828 AC |
321 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
322 | function returns to. */ | |
7043d8dc AC |
323 | |
324 | static CORE_ADDR | |
325 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 326 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
327 | struct value **args, int nargs, |
328 | struct type *value_type, | |
e4fd649a UW |
329 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
330 | struct regcache *regcache) | |
7043d8dc | 331 | { |
50a834af MK |
332 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
333 | ||
334 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
335 | args, nargs, value_type, real_pc, bp_addr, | |
336 | regcache); | |
7043d8dc AC |
337 | } |
338 | ||
b89667eb DE |
339 | /* Fetch the name of the function at FUNADDR. |
340 | This is used in printing an error message for call_function_by_hand. | |
341 | BUF is used to print FUNADDR in hex if the function name cannot be | |
342 | determined. It must be large enough to hold formatted result of | |
343 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
344 | ||
345 | static const char * | |
346 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
347 | { | |
348 | { | |
349 | struct symbol *symbol = find_pc_function (funaddr); | |
abbb1732 | 350 | |
b89667eb DE |
351 | if (symbol) |
352 | return SYMBOL_PRINT_NAME (symbol); | |
353 | } | |
354 | ||
355 | { | |
356 | /* Try the minimal symbols. */ | |
7cbd4a93 | 357 | struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr); |
abbb1732 | 358 | |
7cbd4a93 | 359 | if (msymbol.minsym) |
efd66ac6 | 360 | return MSYMBOL_PRINT_NAME (msymbol.minsym); |
b89667eb DE |
361 | } |
362 | ||
363 | { | |
364 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
365 | hex_string (funaddr)); | |
abbb1732 | 366 | |
b89667eb DE |
367 | gdb_assert (strlen (tmp) + 1 <= buf_size); |
368 | strcpy (buf, tmp); | |
369 | xfree (tmp); | |
370 | return buf; | |
371 | } | |
372 | } | |
373 | ||
374 | /* Subroutine of call_function_by_hand to simplify it. | |
375 | Start up the inferior and wait for it to stop. | |
376 | Return the exception if there's an error, or an exception with | |
377 | reason >= 0 if there's no error. | |
378 | ||
379 | This is done inside a TRY_CATCH so the caller needn't worry about | |
380 | thrown errors. The caller should rethrow if there's an error. */ | |
381 | ||
382 | static struct gdb_exception | |
383 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
384 | { | |
385 | volatile struct gdb_exception e; | |
16c381f0 | 386 | int saved_in_infcall = call_thread->control.in_infcall; |
b89667eb | 387 | ptid_t call_thread_ptid = call_thread->ptid; |
c933f875 PA |
388 | int saved_sync_execution = sync_execution; |
389 | ||
390 | /* Infcalls run synchronously, in the foreground. */ | |
391 | if (target_can_async_p ()) | |
392 | sync_execution = 1; | |
b89667eb | 393 | |
16c381f0 | 394 | call_thread->control.in_infcall = 1; |
c5a4d20b | 395 | |
70509625 | 396 | clear_proceed_status (0); |
b89667eb DE |
397 | |
398 | disable_watchpoints_before_interactive_call_start (); | |
16c381f0 | 399 | |
1777feb0 | 400 | /* We want stop_registers, please... */ |
16c381f0 | 401 | call_thread->control.proceed_to_finish = 1; |
b89667eb | 402 | |
b89667eb | 403 | TRY_CATCH (e, RETURN_MASK_ALL) |
3dd5b83d | 404 | { |
beb460e8 PA |
405 | int was_sync = sync_execution; |
406 | ||
a493e3e2 | 407 | proceed (real_pc, GDB_SIGNAL_0, 0); |
3dd5b83d PA |
408 | |
409 | /* Inferior function calls are always synchronous, even if the | |
410 | target supports asynchronous execution. Do here what | |
411 | `proceed' itself does in sync mode. */ | |
4ae57c05 | 412 | if (target_can_async_p ()) |
3dd5b83d PA |
413 | { |
414 | wait_for_inferior (); | |
415 | normal_stop (); | |
beb460e8 PA |
416 | /* If GDB was previously in sync execution mode, then ensure |
417 | that it remains so. normal_stop calls | |
418 | async_enable_stdin, so reset it again here. In other | |
419 | cases, stdin will be re-enabled by | |
420 | inferior_event_handler, when an exception is thrown. */ | |
421 | if (was_sync) | |
422 | async_disable_stdin (); | |
3dd5b83d PA |
423 | } |
424 | } | |
b89667eb | 425 | |
c5a4d20b PA |
426 | /* At this point the current thread may have changed. Refresh |
427 | CALL_THREAD as it could be invalid if its thread has exited. */ | |
e09875d4 | 428 | call_thread = find_thread_ptid (call_thread_ptid); |
b89667eb | 429 | |
b89667eb DE |
430 | enable_watchpoints_after_interactive_call_stop (); |
431 | ||
432 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
433 | of inferior call thread. | |
434 | If all error()s out of proceed ended up calling normal_stop | |
435 | (and perhaps they should; it already does in the special case | |
436 | of error out of resume()), then we wouldn't need this. */ | |
437 | if (e.reason < 0) | |
438 | { | |
c5a4d20b | 439 | if (call_thread != NULL) |
16c381f0 | 440 | breakpoint_auto_delete (call_thread->control.stop_bpstat); |
b89667eb DE |
441 | } |
442 | ||
c5a4d20b | 443 | if (call_thread != NULL) |
16c381f0 | 444 | call_thread->control.in_infcall = saved_in_infcall; |
c5a4d20b | 445 | |
c933f875 PA |
446 | sync_execution = saved_sync_execution; |
447 | ||
b89667eb DE |
448 | return e; |
449 | } | |
450 | ||
aa7d318d TT |
451 | /* A cleanup function that calls delete_std_terminate_breakpoint. */ |
452 | static void | |
453 | cleanup_delete_std_terminate_breakpoint (void *ignore) | |
454 | { | |
455 | delete_std_terminate_breakpoint (); | |
456 | } | |
457 | ||
04714b91 AC |
458 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
459 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
460 | frame which looks just like a real frame is so that if you call a | |
461 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
462 | will look right. Whether the backtrace needs to actually show the | |
463 | stack at the time the inferior function was called is debatable, but | |
464 | it certainly needs to not display garbage. So if you are contemplating | |
465 | making dummy frames be different from normal frames, consider that. */ | |
466 | ||
467 | /* Perform a function call in the inferior. | |
468 | ARGS is a vector of values of arguments (NARGS of them). | |
469 | FUNCTION is a value, the function to be called. | |
470 | Returns a value representing what the function returned. | |
471 | May fail to return, if a breakpoint or signal is hit | |
472 | during the execution of the function. | |
473 | ||
1777feb0 | 474 | ARGS is modified to contain coerced values. */ |
04714b91 AC |
475 | |
476 | struct value * | |
477 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
478 | { | |
52f0bd74 | 479 | CORE_ADDR sp; |
41f1b697 | 480 | struct type *values_type, *target_values_type; |
18648a37 | 481 | unsigned char struct_return = 0, hidden_first_param_p = 0; |
04714b91 | 482 | CORE_ADDR struct_addr = 0; |
16c381f0 | 483 | struct infcall_control_state *inf_status; |
04714b91 | 484 | struct cleanup *inf_status_cleanup; |
16c381f0 | 485 | struct infcall_suspend_state *caller_state; |
04714b91 | 486 | CORE_ADDR funaddr; |
04714b91 | 487 | CORE_ADDR real_pc; |
df407dfe | 488 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 489 | CORE_ADDR bp_addr; |
96860204 | 490 | struct frame_id dummy_id; |
41f1b697 | 491 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
492 | struct frame_info *frame; |
493 | struct gdbarch *gdbarch; | |
aa7d318d | 494 | struct cleanup *terminate_bp_cleanup; |
b89667eb DE |
495 | ptid_t call_thread_ptid; |
496 | struct gdb_exception e; | |
b89667eb | 497 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; |
04714b91 | 498 | |
4c850810 DJ |
499 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
500 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
501 | ||
04714b91 AC |
502 | if (!target_has_execution) |
503 | noprocess (); | |
504 | ||
573cda03 SS |
505 | if (get_traceframe_number () >= 0) |
506 | error (_("May not call functions while looking at trace frames.")); | |
507 | ||
949dc678 | 508 | if (execution_direction == EXEC_REVERSE) |
c2949be0 | 509 | error (_("Cannot call functions in reverse mode.")); |
949dc678 | 510 | |
0b9dfe2b MD |
511 | frame = get_current_frame (); |
512 | gdbarch = get_frame_arch (frame); | |
513 | ||
514 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 515 | error (_("This target does not support function calls.")); |
a86c5fc9 | 516 | |
b89667eb DE |
517 | /* A cleanup for the inferior status. |
518 | This is only needed while we're preparing the inferior function call. */ | |
16c381f0 JK |
519 | inf_status = save_infcall_control_state (); |
520 | inf_status_cleanup | |
521 | = make_cleanup_restore_infcall_control_state (inf_status); | |
04714b91 | 522 | |
b89667eb DE |
523 | /* Save the caller's registers and other state associated with the |
524 | inferior itself so that they can be restored once the | |
96860204 AC |
525 | callee returns. To allow nested calls the registers are (further |
526 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
527 | is tossed once the regcache has been pushed). */ | |
16c381f0 JK |
528 | caller_state = save_infcall_suspend_state (); |
529 | make_cleanup_restore_infcall_suspend_state (caller_state); | |
04714b91 | 530 | |
04714b91 | 531 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 532 | { |
0b9dfe2b | 533 | CORE_ADDR old_sp = get_frame_sp (frame); |
abbb1732 | 534 | |
0b9dfe2b | 535 | if (gdbarch_frame_align_p (gdbarch)) |
ebc7896c | 536 | { |
0b9dfe2b | 537 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
538 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
539 | ABIs, a function can use memory beyond the inner most stack | |
540 | address. AMD64 called that region the "red zone". Skip at | |
541 | least the "red zone" size before allocating any space on | |
542 | the stack. */ | |
0b9dfe2b MD |
543 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
544 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 545 | else |
0b9dfe2b | 546 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 547 | /* Still aligned? */ |
0b9dfe2b | 548 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
549 | /* NOTE: cagney/2002-09-18: |
550 | ||
551 | On a RISC architecture, a void parameterless generic dummy | |
552 | frame (i.e., no parameters, no result) typically does not | |
553 | need to push anything the stack and hence can leave SP and | |
c48a845b | 554 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
555 | not push anything on the stack and, hence, that too can |
556 | leave FP and SP unchanged. As a consequence, a sequence of | |
557 | void parameterless generic dummy frame calls to frameless | |
558 | functions will create a sequence of effectively identical | |
559 | frames (SP, FP and TOS and PC the same). This, not | |
560 | suprisingly, results in what appears to be a stack in an | |
561 | infinite loop --- when GDB tries to find a generic dummy | |
562 | frame on the internal dummy frame stack, it will always | |
563 | find the first one. | |
564 | ||
565 | To avoid this problem, the code below always grows the | |
566 | stack. That way, two dummy frames can never be identical. | |
567 | It does burn a few bytes of stack but that is a small price | |
568 | to pay :-). */ | |
ebc7896c AC |
569 | if (sp == old_sp) |
570 | { | |
0b9dfe2b | 571 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 572 | /* Stack grows down. */ |
0b9dfe2b | 573 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
574 | else |
575 | /* Stack grows up. */ | |
0b9dfe2b | 576 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 577 | } |
0e095b7e JK |
578 | /* SP may have underflown address zero here from OLD_SP. Memory access |
579 | functions will probably fail in such case but that is a target's | |
580 | problem. */ | |
ebc7896c AC |
581 | } |
582 | else | |
a59fe496 AC |
583 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
584 | ||
8b148df9 AC |
585 | Who knows how badly aligned the SP is! |
586 | ||
587 | If the generic dummy frame ends up empty (because nothing is | |
588 | pushed) GDB won't be able to correctly perform back traces. | |
589 | If a target is having trouble with backtraces, first thing to | |
1777feb0 | 590 | do is add FRAME_ALIGN() to the architecture vector. If that |
669fac23 | 591 | fails, try dummy_id(). |
8b148df9 AC |
592 | |
593 | If the ABI specifies a "Red Zone" (see the doco) the code | |
594 | below will quietly trash it. */ | |
ebc7896c AC |
595 | sp = old_sp; |
596 | } | |
04714b91 | 597 | |
df407dfe | 598 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
599 | if (!values_type) |
600 | values_type = builtin_type (gdbarch)->builtin_int; | |
601 | ||
df407dfe | 602 | CHECK_TYPEDEF (values_type); |
04714b91 | 603 | |
41f1b697 DJ |
604 | /* Are we returning a value using a structure return (passing a |
605 | hidden argument pointing to storage) or a normal value return? | |
606 | There are two cases: language-mandated structure return and | |
607 | target ABI structure return. The variable STRUCT_RETURN only | |
608 | describes the latter. The language version is handled by passing | |
609 | the return location as the first parameter to the function, | |
610 | even preceding "this". This is different from the target | |
611 | ABI version, which is target-specific; for instance, on ia64 | |
612 | the first argument is passed in out0 but the hidden structure | |
613 | return pointer would normally be passed in r8. */ | |
614 | ||
18648a37 | 615 | if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type)) |
41f1b697 | 616 | { |
18648a37 | 617 | hidden_first_param_p = 1; |
04714b91 | 618 | |
41f1b697 DJ |
619 | /* Tell the target specific argument pushing routine not to |
620 | expect a value. */ | |
48319d1f | 621 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
622 | } |
623 | else | |
624 | { | |
6a3a010b | 625 | struct_return = using_struct_return (gdbarch, function, values_type); |
41f1b697 DJ |
626 | target_values_type = values_type; |
627 | } | |
04714b91 | 628 | |
7043d8dc AC |
629 | /* Determine the location of the breakpoint (and possibly other |
630 | stuff) that the called function will return to. The SPARC, for a | |
631 | function returning a structure or union, needs to make space for | |
632 | not just the breakpoint but also an extra word containing the | |
633 | size (?) of the structure being passed. */ | |
634 | ||
0b9dfe2b | 635 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
636 | { |
637 | case ON_STACK: | |
a14dd77e JK |
638 | { |
639 | const gdb_byte *bp_bytes; | |
640 | CORE_ADDR bp_addr_as_address; | |
641 | int bp_size; | |
642 | ||
643 | /* Be careful BP_ADDR is in inferior PC encoding while | |
644 | BP_ADDR_AS_ADDRESS is a plain memory address. */ | |
645 | ||
646 | sp = push_dummy_code (gdbarch, sp, funaddr, args, nargs, | |
647 | target_values_type, &real_pc, &bp_addr, | |
648 | get_current_regcache ()); | |
649 | ||
650 | /* Write a legitimate instruction at the point where the infcall | |
651 | breakpoint is going to be inserted. While this instruction | |
652 | is never going to be executed, a user investigating the | |
653 | memory from GDB would see this instruction instead of random | |
654 | uninitialized bytes. We chose the breakpoint instruction | |
655 | as it may look as the most logical one to the user and also | |
656 | valgrind 3.7.0 needs it for proper vgdb inferior calls. | |
657 | ||
658 | If software breakpoints are unsupported for this target we | |
659 | leave the user visible memory content uninitialized. */ | |
660 | ||
661 | bp_addr_as_address = bp_addr; | |
662 | bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address, | |
663 | &bp_size); | |
664 | if (bp_bytes != NULL) | |
665 | write_memory (bp_addr_as_address, bp_bytes, bp_size); | |
666 | } | |
7043d8dc | 667 | break; |
5931a2fa JK |
668 | case AT_ENTRY_POINT: |
669 | { | |
670 | CORE_ADDR dummy_addr; | |
671 | ||
672 | real_pc = funaddr; | |
673 | dummy_addr = entry_point_address (); | |
a14dd77e | 674 | |
5931a2fa | 675 | /* A call dummy always consists of just a single breakpoint, so |
a14dd77e JK |
676 | its address is the same as the address of the dummy. |
677 | ||
678 | The actual breakpoint is inserted separatly so there is no need to | |
679 | write that out. */ | |
5931a2fa JK |
680 | bp_addr = dummy_addr; |
681 | break; | |
682 | } | |
04714b91 | 683 | default: |
e2e0b3e5 | 684 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
685 | } |
686 | ||
04714b91 | 687 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 688 | error (_("Too few arguments in function call.")); |
04714b91 | 689 | |
ebc7896c AC |
690 | { |
691 | int i; | |
abbb1732 | 692 | |
ebc7896c AC |
693 | for (i = nargs - 1; i >= 0; i--) |
694 | { | |
695 | int prototyped; | |
696 | struct type *param_type; | |
697 | ||
698 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
699 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
700 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
701 | prototyped = 1; | |
702 | else if (i < TYPE_NFIELDS (ftype)) | |
703 | prototyped = TYPE_PROTOTYPED (ftype); | |
704 | else | |
705 | prototyped = 0; | |
706 | ||
707 | if (i < TYPE_NFIELDS (ftype)) | |
708 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
709 | else | |
710 | param_type = NULL; | |
41f1b697 | 711 | |
7788af6d UW |
712 | args[i] = value_arg_coerce (gdbarch, args[i], |
713 | param_type, prototyped, &sp); | |
ebc7896c | 714 | |
41f1b697 DJ |
715 | if (param_type != NULL && language_pass_by_reference (param_type)) |
716 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
717 | } |
718 | } | |
04714b91 | 719 | |
04714b91 AC |
720 | /* Reserve space for the return structure to be written on the |
721 | stack, if necessary. Make certain that the value is correctly | |
1777feb0 | 722 | aligned. */ |
04714b91 | 723 | |
18648a37 | 724 | if (struct_return || hidden_first_param_p) |
04714b91 | 725 | { |
0b9dfe2b | 726 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
727 | { |
728 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
729 | making space for the return value. */ | |
744a8059 | 730 | sp -= TYPE_LENGTH (values_type); |
0b9dfe2b MD |
731 | if (gdbarch_frame_align_p (gdbarch)) |
732 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
733 | struct_addr = sp; |
734 | } | |
735 | else | |
736 | { | |
737 | /* Stack grows upward. Align the frame, allocate space, and | |
1777feb0 | 738 | then again, re-align the frame??? */ |
0b9dfe2b MD |
739 | if (gdbarch_frame_align_p (gdbarch)) |
740 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 | 741 | struct_addr = sp; |
744a8059 | 742 | sp += TYPE_LENGTH (values_type); |
0b9dfe2b MD |
743 | if (gdbarch_frame_align_p (gdbarch)) |
744 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
745 | } |
746 | } | |
747 | ||
18648a37 | 748 | if (hidden_first_param_p) |
41f1b697 DJ |
749 | { |
750 | struct value **new_args; | |
751 | ||
752 | /* Add the new argument to the front of the argument list. */ | |
753 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
754 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
755 | struct_addr); | |
756 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
757 | args = new_args; | |
758 | nargs++; | |
759 | args_cleanup = make_cleanup (xfree, args); | |
760 | } | |
761 | else | |
762 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
763 | ||
04714b91 AC |
764 | /* Create the dummy stack frame. Pass in the call dummy address as, |
765 | presumably, the ABI code knows where, in the call dummy, the | |
766 | return address should be pointed. */ | |
0b9dfe2b MD |
767 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
768 | bp_addr, nargs, args, | |
594f7785 | 769 | sp, struct_return, struct_addr); |
04714b91 | 770 | |
41f1b697 DJ |
771 | do_cleanups (args_cleanup); |
772 | ||
96860204 AC |
773 | /* Set up a frame ID for the dummy frame so we can pass it to |
774 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
775 | ID so that the breakpoint code can correctly re-identify the | |
776 | dummy breakpoint. */ | |
8241eaa6 | 777 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 778 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 779 | the frame ID's stack address. */ |
96860204 | 780 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 781 | |
74cfe982 AC |
782 | /* Create a momentary breakpoint at the return address of the |
783 | inferior. That way it breaks when it returns. */ | |
04714b91 | 784 | |
74cfe982 | 785 | { |
e2e4d78b | 786 | struct breakpoint *bpt, *longjmp_b; |
74cfe982 | 787 | struct symtab_and_line sal; |
abbb1732 | 788 | |
74cfe982 | 789 | init_sal (&sal); /* initialize to zeroes */ |
6c95b8df | 790 | sal.pspace = current_program_space; |
74cfe982 AC |
791 | sal.pc = bp_addr; |
792 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
793 | /* Sanity. The exact same SP value is returned by |
794 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 795 | dummy_id to form the frame ID's stack address. */ |
a6d9a66e | 796 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
c70a6932 JK |
797 | |
798 | /* set_momentary_breakpoint invalidates FRAME. */ | |
799 | frame = NULL; | |
800 | ||
74cfe982 | 801 | bpt->disposition = disp_del; |
e2e4d78b JK |
802 | gdb_assert (bpt->related_breakpoint == bpt); |
803 | ||
804 | longjmp_b = set_longjmp_breakpoint_for_call_dummy (); | |
805 | if (longjmp_b) | |
806 | { | |
807 | /* Link BPT into the chain of LONGJMP_B. */ | |
808 | bpt->related_breakpoint = longjmp_b; | |
809 | while (longjmp_b->related_breakpoint != bpt->related_breakpoint) | |
810 | longjmp_b = longjmp_b->related_breakpoint; | |
811 | longjmp_b->related_breakpoint = bpt; | |
812 | } | |
74cfe982 | 813 | } |
04714b91 | 814 | |
7cd1089b PM |
815 | /* Create a breakpoint in std::terminate. |
816 | If a C++ exception is raised in the dummy-frame, and the | |
817 | exception handler is (normally, and expected to be) out-of-frame, | |
818 | the default C++ handler will (wrongly) be called in an inferior | |
819 | function call. This is wrong, as an exception can be normally | |
820 | and legally handled out-of-frame. The confines of the dummy frame | |
821 | prevent the unwinder from finding the correct handler (or any | |
822 | handler, unless it is in-frame). The default handler calls | |
823 | std::terminate. This will kill the inferior. Assert that | |
824 | terminate should never be called in an inferior function | |
825 | call. Place a momentary breakpoint in the std::terminate function | |
826 | and if triggered in the call, rewind. */ | |
827 | if (unwind_on_terminating_exception_p) | |
aa7d318d | 828 | set_std_terminate_breakpoint (); |
7cd1089b | 829 | |
96860204 AC |
830 | /* Everything's ready, push all the info needed to restore the |
831 | caller (and identify the dummy-frame) onto the dummy-frame | |
832 | stack. */ | |
b67a2c6f | 833 | dummy_frame_push (caller_state, &dummy_id, inferior_ptid); |
b89667eb DE |
834 | |
835 | /* Discard both inf_status and caller_state cleanups. | |
836 | From this point on we explicitly restore the associated state | |
837 | or discard it. */ | |
838 | discard_cleanups (inf_status_cleanup); | |
96860204 | 839 | |
7cd1089b | 840 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
aa7d318d TT |
841 | terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, |
842 | NULL); | |
7cd1089b | 843 | |
96860204 AC |
844 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
845 | If you're looking to implement asynchronous dummy-frames, then | |
846 | just below is the place to chop this function in two.. */ | |
847 | ||
b89667eb DE |
848 | /* TP is invalid after run_inferior_call returns, so enclose this |
849 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 850 | { |
32400beb | 851 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 852 | |
b89667eb DE |
853 | /* Save this thread's ptid, we need it later but the thread |
854 | may have exited. */ | |
855 | call_thread_ptid = tp->ptid; | |
74cfe982 | 856 | |
b89667eb | 857 | /* Run the inferior until it stops. */ |
f5871ec0 | 858 | |
b89667eb | 859 | e = run_inferior_call (tp, real_pc); |
52557533 | 860 | } |
04714b91 | 861 | |
b89667eb DE |
862 | /* Rethrow an error if we got one trying to run the inferior. */ |
863 | ||
864 | if (e.reason < 0) | |
865 | { | |
866 | const char *name = get_function_name (funaddr, | |
867 | name_buf, sizeof (name_buf)); | |
868 | ||
16c381f0 | 869 | discard_infcall_control_state (inf_status); |
b89667eb DE |
870 | |
871 | /* We could discard the dummy frame here if the program exited, | |
872 | but it will get garbage collected the next time the program is | |
873 | run anyway. */ | |
874 | ||
875 | switch (e.reason) | |
876 | { | |
877 | case RETURN_ERROR: | |
ac74f770 MS |
878 | throw_error (e.error, _("%s\n\ |
879 | An error occurred while in a function called from GDB.\n\ | |
880 | Evaluation of the expression containing the function\n\ | |
881 | (%s) will be abandoned.\n\ | |
882 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
883 | e.message, name); |
884 | case RETURN_QUIT: | |
885 | default: | |
886 | throw_exception (e); | |
887 | } | |
888 | } | |
889 | ||
890 | /* If the program has exited, or we stopped at a different thread, | |
891 | exit and inform the user. */ | |
892 | ||
de04a248 DE |
893 | if (! target_has_execution) |
894 | { | |
b89667eb DE |
895 | const char *name = get_function_name (funaddr, |
896 | name_buf, sizeof (name_buf)); | |
897 | ||
898 | /* If we try to restore the inferior status, | |
de04a248 | 899 | we'll crash as the inferior is no longer running. */ |
16c381f0 | 900 | discard_infcall_control_state (inf_status); |
b89667eb DE |
901 | |
902 | /* We could discard the dummy frame here given that the program exited, | |
903 | but it will get garbage collected the next time the program is | |
904 | run anyway. */ | |
905 | ||
3e43a32a MS |
906 | error (_("The program being debugged exited while in a function " |
907 | "called from GDB.\n" | |
908 | "Evaluation of the expression containing the function\n" | |
909 | "(%s) will be abandoned."), | |
b89667eb DE |
910 | name); |
911 | } | |
912 | ||
913 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
914 | { | |
915 | const char *name = get_function_name (funaddr, | |
916 | name_buf, sizeof (name_buf)); | |
917 | ||
918 | /* We've switched threads. This can happen if another thread gets a | |
919 | signal or breakpoint while our thread was running. | |
920 | There's no point in restoring the inferior status, | |
921 | we're in a different thread. */ | |
16c381f0 | 922 | discard_infcall_control_state (inf_status); |
b89667eb DE |
923 | /* Keep the dummy frame record, if the user switches back to the |
924 | thread with the hand-call, we'll need it. */ | |
925 | if (stopped_by_random_signal) | |
ac74f770 MS |
926 | error (_("\ |
927 | The program received a signal in another thread while\n\ | |
928 | making a function call from GDB.\n\ | |
929 | Evaluation of the expression containing the function\n\ | |
930 | (%s) will be abandoned.\n\ | |
931 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
932 | name); |
933 | else | |
ac74f770 MS |
934 | error (_("\ |
935 | The program stopped in another thread while making a function call from GDB.\n\ | |
936 | Evaluation of the expression containing the function\n\ | |
937 | (%s) will be abandoned.\n\ | |
938 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 939 | name); |
de04a248 DE |
940 | } |
941 | ||
aa7d318d | 942 | if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY) |
52557533 | 943 | { |
b89667eb DE |
944 | const char *name = get_function_name (funaddr, |
945 | name_buf, sizeof (name_buf)); | |
946 | ||
52557533 AC |
947 | if (stopped_by_random_signal) |
948 | { | |
949 | /* We stopped inside the FUNCTION because of a random | |
950 | signal. Further execution of the FUNCTION is not | |
1777feb0 | 951 | allowed. */ |
04714b91 | 952 | |
52557533 AC |
953 | if (unwind_on_signal_p) |
954 | { | |
1777feb0 | 955 | /* The user wants the context restored. */ |
52557533 AC |
956 | |
957 | /* We must get back to the frame we were before the | |
b89667eb | 958 | dummy call. */ |
b67a2c6f | 959 | dummy_frame_pop (dummy_id, call_thread_ptid); |
b89667eb DE |
960 | |
961 | /* We also need to restore inferior status to that before the | |
962 | dummy call. */ | |
16c381f0 | 963 | restore_infcall_control_state (inf_status); |
04714b91 | 964 | |
52557533 AC |
965 | /* FIXME: Insert a bunch of wrap_here; name can be very |
966 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
967 | error (_("\ |
968 | The program being debugged was signaled while in a function called from GDB.\n\ | |
969 | GDB has restored the context to what it was before the call.\n\ | |
970 | To change this behavior use \"set unwindonsignal off\".\n\ | |
971 | Evaluation of the expression containing the function\n\ | |
972 | (%s) will be abandoned."), | |
52557533 AC |
973 | name); |
974 | } | |
975 | else | |
976 | { | |
977 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
978 | (default). |
979 | Discard inferior status, we're not at the same point | |
980 | we started at. */ | |
16c381f0 | 981 | discard_infcall_control_state (inf_status); |
b89667eb | 982 | |
52557533 AC |
983 | /* FIXME: Insert a bunch of wrap_here; name can be very |
984 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
985 | error (_("\ |
986 | The program being debugged was signaled while in a function called from GDB.\n\ | |
987 | GDB remains in the frame where the signal was received.\n\ | |
988 | To change this behavior use \"set unwindonsignal on\".\n\ | |
989 | Evaluation of the expression containing the function\n\ | |
990 | (%s) will be abandoned.\n\ | |
991 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
992 | name); |
993 | } | |
994 | } | |
04714b91 | 995 | |
aa7d318d | 996 | if (stop_stack_dummy == STOP_STD_TERMINATE) |
52557533 | 997 | { |
aa7d318d TT |
998 | /* We must get back to the frame we were before the dummy |
999 | call. */ | |
b67a2c6f | 1000 | dummy_frame_pop (dummy_id, call_thread_ptid); |
7cd1089b | 1001 | |
aa7d318d TT |
1002 | /* We also need to restore inferior status to that before |
1003 | the dummy call. */ | |
16c381f0 | 1004 | restore_infcall_control_state (inf_status); |
aa7d318d | 1005 | |
ac74f770 MS |
1006 | error (_("\ |
1007 | The program being debugged entered a std::terminate call, most likely\n\ | |
1008 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
1009 | to prevent the program from being terminated, and has restored the\n\ | |
1010 | context to its original state before the call.\n\ | |
1011 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
1012 | Evaluation of the expression containing the function (%s)\n\ | |
1013 | will be abandoned."), | |
aa7d318d TT |
1014 | name); |
1015 | } | |
1016 | else if (stop_stack_dummy == STOP_NONE) | |
1017 | { | |
1018 | ||
b89667eb DE |
1019 | /* We hit a breakpoint inside the FUNCTION. |
1020 | Keep the dummy frame, the user may want to examine its state. | |
1021 | Discard inferior status, we're not at the same point | |
1022 | we started at. */ | |
16c381f0 | 1023 | discard_infcall_control_state (inf_status); |
b89667eb | 1024 | |
52557533 AC |
1025 | /* The following error message used to say "The expression |
1026 | which contained the function call has been discarded." | |
1027 | It is a hard concept to explain in a few words. Ideally, | |
1028 | GDB would be able to resume evaluation of the expression | |
1029 | when the function finally is done executing. Perhaps | |
1030 | someday this will be implemented (it would not be easy). */ | |
1031 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
1032 | a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1033 | error (_("\ |
1034 | The program being debugged stopped while in a function called from GDB.\n\ | |
1035 | Evaluation of the expression containing the function\n\ | |
1036 | (%s) will be abandoned.\n\ | |
1037 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 1038 | name); |
52557533 AC |
1039 | } |
1040 | ||
1041 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 1042 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 1043 | } |
04714b91 | 1044 | |
aa7d318d | 1045 | do_cleanups (terminate_bp_cleanup); |
2f2da8f6 | 1046 | |
b89667eb DE |
1047 | /* If we get here the called FUNCTION ran to completion, |
1048 | and the dummy frame has already been popped. */ | |
74cfe982 | 1049 | |
44e5158b | 1050 | { |
d37346f0 DJ |
1051 | struct address_space *aspace = get_regcache_aspace (stop_registers); |
1052 | struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); | |
b89667eb | 1053 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); |
1a4d7a36 MK |
1054 | struct value *retval = NULL; |
1055 | ||
b89667eb DE |
1056 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
1057 | ||
1058 | /* Inferior call is successful. Restore the inferior status. | |
1059 | At this stage, leave the RETBUF alone. */ | |
16c381f0 | 1060 | restore_infcall_control_state (inf_status); |
b89667eb DE |
1061 | |
1062 | /* Figure out the value returned by the function. */ | |
81b4675a | 1063 | retval = allocate_value (values_type); |
b89667eb | 1064 | |
18648a37 | 1065 | if (hidden_first_param_p) |
81b4675a UW |
1066 | read_value_memory (retval, 0, 1, struct_addr, |
1067 | value_contents_raw (retval), | |
1068 | TYPE_LENGTH (values_type)); | |
1069 | else if (TYPE_CODE (target_values_type) != TYPE_CODE_VOID) | |
44e5158b | 1070 | { |
1a4d7a36 MK |
1071 | /* If the function returns void, don't bother fetching the |
1072 | return value. */ | |
6a3a010b MR |
1073 | switch (gdbarch_return_value (gdbarch, function, target_values_type, |
1074 | NULL, NULL, NULL)) | |
1a4d7a36 MK |
1075 | { |
1076 | case RETURN_VALUE_REGISTER_CONVENTION: | |
1077 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: | |
1078 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: | |
6a3a010b | 1079 | gdbarch_return_value (gdbarch, function, values_type, |
c055b101 | 1080 | retbuf, value_contents_raw (retval), NULL); |
1a4d7a36 MK |
1081 | break; |
1082 | case RETURN_VALUE_STRUCT_CONVENTION: | |
81b4675a UW |
1083 | read_value_memory (retval, 0, 1, struct_addr, |
1084 | value_contents_raw (retval), | |
1085 | TYPE_LENGTH (values_type)); | |
1a4d7a36 MK |
1086 | break; |
1087 | } | |
1088 | } | |
1089 | ||
44e5158b | 1090 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 1091 | |
b89667eb | 1092 | gdb_assert (retval); |
44e5158b AC |
1093 | return retval; |
1094 | } | |
04714b91 | 1095 | } |
1a4d7a36 | 1096 | \f |
04714b91 | 1097 | |
1a4d7a36 | 1098 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
1099 | void _initialize_infcall (void); |
1100 | ||
1101 | void | |
1102 | _initialize_infcall (void) | |
1103 | { | |
1104 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1105 | &coerce_float_to_double_p, _("\ |
1106 | Set coercion of floats to doubles when calling functions."), _("\ | |
1107 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1108 | Variables of type float should generally be converted to doubles before\n\ |
1109 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1110 | function. However, some older debug info formats do not provide enough\n\ | |
1111 | information to determine that a function is prototyped. If this flag is\n\ | |
1112 | set, GDB will perform the conversion for a function it considers\n\ | |
1113 | unprototyped.\n\ | |
7915a72c | 1114 | The default is to perform the conversion.\n"), |
2c5b56ce | 1115 | NULL, |
920d2a44 | 1116 | show_coerce_float_to_double_p, |
2c5b56ce | 1117 | &setlist, &showlist); |
04714b91 AC |
1118 | |
1119 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1120 | &unwind_on_signal_p, _("\ |
1121 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1122 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1123 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1124 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1125 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1126 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1127 | NULL, |
920d2a44 | 1128 | show_unwind_on_signal_p, |
2c5b56ce | 1129 | &setlist, &showlist); |
7cd1089b PM |
1130 | |
1131 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1132 | &unwind_on_terminating_exception_p, _("\ | |
1133 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
3e43a32a MS |
1134 | Show unwinding of stack if std::terminate() is called while in a call dummy."), |
1135 | _("\ | |
7cd1089b PM |
1136 | The unwind on terminating exception flag lets the user determine\n\ |
1137 | what gdb should do if a std::terminate() call is made from the\n\ | |
1138 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1139 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1140 | std::terminate call to proceed.\n\ | |
1141 | The default is to unwind the frame."), | |
1142 | NULL, | |
1143 | show_unwind_on_terminating_exception_p, | |
1144 | &setlist, &showlist); | |
1145 | ||
04714b91 | 1146 | } |