Commit | Line | Data |
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04714b91 AC |
1 | /* Perform an inferior function call, for GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | Copyright (C) 1986-2015 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" |
162078c8 | 38 | #include "observer.h" |
b89667eb DE |
39 | |
40 | /* If we can't find a function's name from its address, | |
41 | we print this instead. */ | |
42 | #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" | |
43 | #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ | |
44 | + 2 * sizeof (CORE_ADDR)) | |
04714b91 AC |
45 | |
46 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
47 | ||
48 | GDB needs an asynchronous expression evaluator, that means an | |
49 | asynchronous inferior function call implementation, and that in | |
50 | turn means restructuring the code so that it is event driven. */ | |
51 | ||
52 | /* How you should pass arguments to a function depends on whether it | |
53 | was defined in K&R style or prototype style. If you define a | |
54 | function using the K&R syntax that takes a `float' argument, then | |
55 | callers must pass that argument as a `double'. If you define the | |
56 | function using the prototype syntax, then you must pass the | |
57 | argument as a `float', with no promotion. | |
58 | ||
59 | Unfortunately, on certain older platforms, the debug info doesn't | |
60 | indicate reliably how each function was defined. A function type's | |
61 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was | |
62 | defined in prototype style. When calling a function whose | |
63 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to | |
64 | decide what to do. | |
65 | ||
66 | For modern targets, it is proper to assume that, if the prototype | |
67 | flag is clear, that can be trusted: `float' arguments should be | |
68 | promoted to `double'. For some older targets, if the prototype | |
69 | flag is clear, that doesn't tell us anything. The default is to | |
70 | trust the debug information; the user can override this behavior | |
71 | with "set coerce-float-to-double 0". */ | |
72 | ||
73 | static int coerce_float_to_double_p = 1; | |
920d2a44 AC |
74 | static void |
75 | show_coerce_float_to_double_p (struct ui_file *file, int from_tty, | |
76 | struct cmd_list_element *c, const char *value) | |
77 | { | |
3e43a32a MS |
78 | fprintf_filtered (file, |
79 | _("Coercion of floats to doubles " | |
80 | "when calling functions is %s.\n"), | |
920d2a44 AC |
81 | value); |
82 | } | |
04714b91 AC |
83 | |
84 | /* This boolean tells what gdb should do if a signal is received while | |
85 | in a function called from gdb (call dummy). If set, gdb unwinds | |
86 | the stack and restore the context to what as it was before the | |
87 | call. | |
88 | ||
1777feb0 | 89 | The default is to stop in the frame where the signal was received. */ |
04714b91 | 90 | |
ef61f180 | 91 | static int unwind_on_signal_p = 0; |
920d2a44 AC |
92 | static void |
93 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, | |
94 | struct cmd_list_element *c, const char *value) | |
95 | { | |
3e43a32a MS |
96 | fprintf_filtered (file, |
97 | _("Unwinding of stack if a signal is " | |
98 | "received while in a call dummy is %s.\n"), | |
920d2a44 AC |
99 | value); |
100 | } | |
101 | ||
7cd1089b PM |
102 | /* This boolean tells what gdb should do if a std::terminate call is |
103 | made while in a function called from gdb (call dummy). | |
104 | As the confines of a single dummy stack prohibit out-of-frame | |
105 | handlers from handling a raised exception, and as out-of-frame | |
106 | handlers are common in C++, this can lead to no handler being found | |
107 | by the unwinder, and a std::terminate call. This is a false positive. | |
108 | If set, gdb unwinds the stack and restores the context to what it | |
109 | was before the call. | |
110 | ||
111 | The default is to unwind the frame if a std::terminate call is | |
112 | made. */ | |
113 | ||
114 | static int unwind_on_terminating_exception_p = 1; | |
115 | ||
116 | static void | |
117 | show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, | |
118 | struct cmd_list_element *c, | |
119 | const char *value) | |
120 | ||
121 | { | |
3e43a32a MS |
122 | fprintf_filtered (file, |
123 | _("Unwind stack if a C++ exception is " | |
124 | "unhandled while in a call dummy is %s.\n"), | |
7cd1089b PM |
125 | value); |
126 | } | |
04714b91 AC |
127 | |
128 | /* Perform the standard coercions that are specified | |
a93c0eb6 | 129 | for arguments to be passed to C or Ada functions. |
04714b91 AC |
130 | |
131 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
a93c0eb6 JB |
132 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
133 | SP is the stack pointer were additional data can be pushed (updating | |
134 | its value as needed). */ | |
04714b91 AC |
135 | |
136 | static struct value * | |
7788af6d UW |
137 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
138 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) | |
04714b91 | 139 | { |
7788af6d | 140 | const struct builtin_type *builtin = builtin_type (gdbarch); |
df407dfe | 141 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 142 | struct type *type |
04714b91 AC |
143 | = param_type ? check_typedef (param_type) : arg_type; |
144 | ||
a93c0eb6 JB |
145 | /* Perform any Ada-specific coercion first. */ |
146 | if (current_language->la_language == language_ada) | |
40bc484c | 147 | arg = ada_convert_actual (arg, type); |
a93c0eb6 | 148 | |
63092375 DJ |
149 | /* Force the value to the target if we will need its address. At |
150 | this point, we could allocate arguments on the stack instead of | |
151 | calling malloc if we knew that their addresses would not be | |
152 | saved by the called function. */ | |
153 | arg = value_coerce_to_target (arg); | |
154 | ||
04714b91 AC |
155 | switch (TYPE_CODE (type)) |
156 | { | |
157 | case TYPE_CODE_REF: | |
fb933624 DJ |
158 | { |
159 | struct value *new_value; | |
160 | ||
161 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) | |
b1af9e97 | 162 | return value_cast_pointers (type, arg, 0); |
fb933624 DJ |
163 | |
164 | /* Cast the value to the reference's target type, and then | |
165 | convert it back to a reference. This will issue an error | |
166 | if the value was not previously in memory - in some cases | |
167 | we should clearly be allowing this, but how? */ | |
168 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); | |
169 | new_value = value_ref (new_value); | |
170 | return new_value; | |
171 | } | |
04714b91 AC |
172 | case TYPE_CODE_INT: |
173 | case TYPE_CODE_CHAR: | |
174 | case TYPE_CODE_BOOL: | |
175 | case TYPE_CODE_ENUM: | |
176 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
177 | if (!is_prototyped) | |
178 | { | |
7788af6d UW |
179 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
180 | type = builtin->builtin_int; | |
04714b91 AC |
181 | } |
182 | /* Currently all target ABIs require at least the width of an integer | |
183 | type for an argument. We may have to conditionalize the following | |
184 | type coercion for future targets. */ | |
7788af6d UW |
185 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
186 | type = builtin->builtin_int; | |
04714b91 AC |
187 | break; |
188 | case TYPE_CODE_FLT: | |
189 | if (!is_prototyped && coerce_float_to_double_p) | |
190 | { | |
7788af6d UW |
191 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
192 | type = builtin->builtin_double; | |
193 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) | |
194 | type = builtin->builtin_long_double; | |
04714b91 AC |
195 | } |
196 | break; | |
197 | case TYPE_CODE_FUNC: | |
198 | type = lookup_pointer_type (type); | |
199 | break; | |
200 | case TYPE_CODE_ARRAY: | |
201 | /* Arrays are coerced to pointers to their first element, unless | |
202 | they are vectors, in which case we want to leave them alone, | |
203 | because they are passed by value. */ | |
204 | if (current_language->c_style_arrays) | |
205 | if (!TYPE_VECTOR (type)) | |
206 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
207 | break; | |
208 | case TYPE_CODE_UNDEF: | |
209 | case TYPE_CODE_PTR: | |
210 | case TYPE_CODE_STRUCT: | |
211 | case TYPE_CODE_UNION: | |
212 | case TYPE_CODE_VOID: | |
213 | case TYPE_CODE_SET: | |
214 | case TYPE_CODE_RANGE: | |
215 | case TYPE_CODE_STRING: | |
04714b91 | 216 | case TYPE_CODE_ERROR: |
0d5de010 DJ |
217 | case TYPE_CODE_MEMBERPTR: |
218 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
219 | case TYPE_CODE_METHOD: |
220 | case TYPE_CODE_COMPLEX: | |
221 | default: | |
222 | break; | |
223 | } | |
224 | ||
225 | return value_cast (type, arg); | |
226 | } | |
227 | ||
07be84bf JK |
228 | /* Return the return type of a function with its first instruction exactly at |
229 | the PC address. Return NULL otherwise. */ | |
230 | ||
231 | static struct type * | |
232 | find_function_return_type (CORE_ADDR pc) | |
233 | { | |
234 | struct symbol *sym = find_pc_function (pc); | |
235 | ||
236 | if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc | |
237 | && SYMBOL_TYPE (sym) != NULL) | |
238 | return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)); | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
04714b91 AC |
243 | /* Determine a function's address and its return type from its value. |
244 | Calls error() if the function is not valid for calling. */ | |
245 | ||
a9fa03de | 246 | CORE_ADDR |
04714b91 AC |
247 | find_function_addr (struct value *function, struct type **retval_type) |
248 | { | |
df407dfe | 249 | struct type *ftype = check_typedef (value_type (function)); |
50810684 | 250 | struct gdbarch *gdbarch = get_type_arch (ftype); |
7788af6d | 251 | struct type *value_type = NULL; |
09b58708 JK |
252 | /* Initialize it just to avoid a GCC false warning. */ |
253 | CORE_ADDR funaddr = 0; | |
04714b91 AC |
254 | |
255 | /* If it's a member function, just look at the function | |
256 | part of it. */ | |
257 | ||
258 | /* Determine address to call. */ | |
300f8e10 JK |
259 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
260 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
261 | funaddr = value_address (function); | |
262 | else if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
04714b91 AC |
263 | { |
264 | funaddr = value_as_address (function); | |
265 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
266 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
267 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
300f8e10 JK |
268 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
269 | ¤t_target); | |
04714b91 | 270 | } |
300f8e10 JK |
271 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
272 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
07be84bf JK |
273 | { |
274 | value_type = TYPE_TARGET_TYPE (ftype); | |
275 | ||
276 | if (TYPE_GNU_IFUNC (ftype)) | |
277 | { | |
278 | funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr); | |
279 | ||
280 | /* Skip querying the function symbol if no RETVAL_TYPE has been | |
281 | asked for. */ | |
282 | if (retval_type) | |
283 | value_type = find_function_return_type (funaddr); | |
284 | } | |
285 | } | |
300f8e10 | 286 | else if (TYPE_CODE (ftype) == TYPE_CODE_INT) |
04714b91 AC |
287 | { |
288 | /* Handle the case of functions lacking debugging info. | |
1777feb0 | 289 | Their values are characters since their addresses are char. */ |
04714b91 AC |
290 | if (TYPE_LENGTH (ftype) == 1) |
291 | funaddr = value_as_address (value_addr (function)); | |
292 | else | |
2bbe3cc1 DJ |
293 | { |
294 | /* Handle function descriptors lacking debug info. */ | |
295 | int found_descriptor = 0; | |
abbb1732 | 296 | |
87bc73ea | 297 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
298 | if (VALUE_LVAL (function) == lval_memory) |
299 | { | |
300 | CORE_ADDR nfunaddr; | |
abbb1732 | 301 | |
2bbe3cc1 DJ |
302 | funaddr = value_as_address (value_addr (function)); |
303 | nfunaddr = funaddr; | |
50810684 | 304 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
2bbe3cc1 DJ |
305 | ¤t_target); |
306 | if (funaddr != nfunaddr) | |
307 | found_descriptor = 1; | |
308 | } | |
309 | if (!found_descriptor) | |
310 | /* Handle integer used as address of a function. */ | |
311 | funaddr = (CORE_ADDR) value_as_long (function); | |
312 | } | |
04714b91 AC |
313 | } |
314 | else | |
8a3fe4f8 | 315 | error (_("Invalid data type for function to be called.")); |
04714b91 | 316 | |
7d9b040b RC |
317 | if (retval_type != NULL) |
318 | *retval_type = value_type; | |
50810684 | 319 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
04714b91 AC |
320 | } |
321 | ||
d3712828 AC |
322 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
323 | function returns to. */ | |
7043d8dc AC |
324 | |
325 | static CORE_ADDR | |
326 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 327 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
328 | struct value **args, int nargs, |
329 | struct type *value_type, | |
e4fd649a UW |
330 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
331 | struct regcache *regcache) | |
7043d8dc | 332 | { |
50a834af MK |
333 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
334 | ||
335 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
336 | args, nargs, value_type, real_pc, bp_addr, | |
337 | regcache); | |
7043d8dc AC |
338 | } |
339 | ||
b89667eb DE |
340 | /* Fetch the name of the function at FUNADDR. |
341 | This is used in printing an error message for call_function_by_hand. | |
342 | BUF is used to print FUNADDR in hex if the function name cannot be | |
343 | determined. It must be large enough to hold formatted result of | |
344 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
345 | ||
346 | static const char * | |
347 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
348 | { | |
349 | { | |
350 | struct symbol *symbol = find_pc_function (funaddr); | |
abbb1732 | 351 | |
b89667eb DE |
352 | if (symbol) |
353 | return SYMBOL_PRINT_NAME (symbol); | |
354 | } | |
355 | ||
356 | { | |
357 | /* Try the minimal symbols. */ | |
7cbd4a93 | 358 | struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr); |
abbb1732 | 359 | |
7cbd4a93 | 360 | if (msymbol.minsym) |
efd66ac6 | 361 | return MSYMBOL_PRINT_NAME (msymbol.minsym); |
b89667eb DE |
362 | } |
363 | ||
364 | { | |
365 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
366 | hex_string (funaddr)); | |
abbb1732 | 367 | |
b89667eb DE |
368 | gdb_assert (strlen (tmp) + 1 <= buf_size); |
369 | strcpy (buf, tmp); | |
370 | xfree (tmp); | |
371 | return buf; | |
372 | } | |
373 | } | |
374 | ||
375 | /* Subroutine of call_function_by_hand to simplify it. | |
376 | Start up the inferior and wait for it to stop. | |
377 | Return the exception if there's an error, or an exception with | |
378 | reason >= 0 if there's no error. | |
379 | ||
380 | This is done inside a TRY_CATCH so the caller needn't worry about | |
381 | thrown errors. The caller should rethrow if there's an error. */ | |
382 | ||
383 | static struct gdb_exception | |
384 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
385 | { | |
386 | volatile struct gdb_exception e; | |
16c381f0 | 387 | int saved_in_infcall = call_thread->control.in_infcall; |
b89667eb | 388 | ptid_t call_thread_ptid = call_thread->ptid; |
c933f875 PA |
389 | int saved_sync_execution = sync_execution; |
390 | ||
391 | /* Infcalls run synchronously, in the foreground. */ | |
392 | if (target_can_async_p ()) | |
393 | sync_execution = 1; | |
b89667eb | 394 | |
16c381f0 | 395 | call_thread->control.in_infcall = 1; |
c5a4d20b | 396 | |
70509625 | 397 | clear_proceed_status (0); |
b89667eb DE |
398 | |
399 | disable_watchpoints_before_interactive_call_start (); | |
16c381f0 | 400 | |
1777feb0 | 401 | /* We want stop_registers, please... */ |
16c381f0 | 402 | call_thread->control.proceed_to_finish = 1; |
b89667eb | 403 | |
b89667eb | 404 | TRY_CATCH (e, RETURN_MASK_ALL) |
3dd5b83d | 405 | { |
beb460e8 PA |
406 | int was_sync = sync_execution; |
407 | ||
a493e3e2 | 408 | proceed (real_pc, GDB_SIGNAL_0, 0); |
3dd5b83d PA |
409 | |
410 | /* Inferior function calls are always synchronous, even if the | |
411 | target supports asynchronous execution. Do here what | |
412 | `proceed' itself does in sync mode. */ | |
4ae57c05 | 413 | if (target_can_async_p ()) |
3dd5b83d PA |
414 | { |
415 | wait_for_inferior (); | |
416 | normal_stop (); | |
beb460e8 PA |
417 | /* If GDB was previously in sync execution mode, then ensure |
418 | that it remains so. normal_stop calls | |
419 | async_enable_stdin, so reset it again here. In other | |
420 | cases, stdin will be re-enabled by | |
421 | inferior_event_handler, when an exception is thrown. */ | |
422 | if (was_sync) | |
423 | async_disable_stdin (); | |
3dd5b83d PA |
424 | } |
425 | } | |
b89667eb | 426 | |
c5a4d20b PA |
427 | /* At this point the current thread may have changed. Refresh |
428 | CALL_THREAD as it could be invalid if its thread has exited. */ | |
e09875d4 | 429 | call_thread = find_thread_ptid (call_thread_ptid); |
b89667eb | 430 | |
b89667eb DE |
431 | enable_watchpoints_after_interactive_call_stop (); |
432 | ||
433 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
434 | of inferior call thread. | |
435 | If all error()s out of proceed ended up calling normal_stop | |
436 | (and perhaps they should; it already does in the special case | |
437 | of error out of resume()), then we wouldn't need this. */ | |
438 | if (e.reason < 0) | |
439 | { | |
c5a4d20b | 440 | if (call_thread != NULL) |
16c381f0 | 441 | breakpoint_auto_delete (call_thread->control.stop_bpstat); |
b89667eb DE |
442 | } |
443 | ||
c5a4d20b | 444 | if (call_thread != NULL) |
16c381f0 | 445 | call_thread->control.in_infcall = saved_in_infcall; |
c5a4d20b | 446 | |
c933f875 PA |
447 | sync_execution = saved_sync_execution; |
448 | ||
b89667eb DE |
449 | return e; |
450 | } | |
451 | ||
aa7d318d TT |
452 | /* A cleanup function that calls delete_std_terminate_breakpoint. */ |
453 | static void | |
454 | cleanup_delete_std_terminate_breakpoint (void *ignore) | |
455 | { | |
456 | delete_std_terminate_breakpoint (); | |
457 | } | |
458 | ||
ed12ef62 JK |
459 | /* See infcall.h. */ |
460 | ||
461 | struct value * | |
462 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
463 | { | |
464 | return call_function_by_hand_dummy (function, nargs, args, NULL, NULL); | |
465 | } | |
466 | ||
04714b91 AC |
467 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
468 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
469 | frame which looks just like a real frame is so that if you call a | |
470 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
471 | will look right. Whether the backtrace needs to actually show the | |
472 | stack at the time the inferior function was called is debatable, but | |
473 | it certainly needs to not display garbage. So if you are contemplating | |
474 | making dummy frames be different from normal frames, consider that. */ | |
475 | ||
476 | /* Perform a function call in the inferior. | |
477 | ARGS is a vector of values of arguments (NARGS of them). | |
478 | FUNCTION is a value, the function to be called. | |
479 | Returns a value representing what the function returned. | |
480 | May fail to return, if a breakpoint or signal is hit | |
481 | during the execution of the function. | |
482 | ||
1777feb0 | 483 | ARGS is modified to contain coerced values. */ |
04714b91 AC |
484 | |
485 | struct value * | |
ed12ef62 JK |
486 | call_function_by_hand_dummy (struct value *function, |
487 | int nargs, struct value **args, | |
488 | call_function_by_hand_dummy_dtor_ftype *dummy_dtor, | |
489 | void *dummy_dtor_data) | |
04714b91 | 490 | { |
52f0bd74 | 491 | CORE_ADDR sp; |
41f1b697 | 492 | struct type *values_type, *target_values_type; |
18648a37 | 493 | unsigned char struct_return = 0, hidden_first_param_p = 0; |
04714b91 | 494 | CORE_ADDR struct_addr = 0; |
16c381f0 | 495 | struct infcall_control_state *inf_status; |
04714b91 | 496 | struct cleanup *inf_status_cleanup; |
16c381f0 | 497 | struct infcall_suspend_state *caller_state; |
04714b91 | 498 | CORE_ADDR funaddr; |
04714b91 | 499 | CORE_ADDR real_pc; |
df407dfe | 500 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 501 | CORE_ADDR bp_addr; |
96860204 | 502 | struct frame_id dummy_id; |
41f1b697 | 503 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
504 | struct frame_info *frame; |
505 | struct gdbarch *gdbarch; | |
aa7d318d | 506 | struct cleanup *terminate_bp_cleanup; |
b89667eb DE |
507 | ptid_t call_thread_ptid; |
508 | struct gdb_exception e; | |
b89667eb | 509 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; |
6c659fc2 | 510 | int stack_temporaries = thread_stack_temporaries_enabled_p (inferior_ptid); |
04714b91 | 511 | |
4c850810 DJ |
512 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
513 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
514 | ||
04714b91 AC |
515 | if (!target_has_execution) |
516 | noprocess (); | |
517 | ||
573cda03 SS |
518 | if (get_traceframe_number () >= 0) |
519 | error (_("May not call functions while looking at trace frames.")); | |
520 | ||
949dc678 | 521 | if (execution_direction == EXEC_REVERSE) |
c2949be0 | 522 | error (_("Cannot call functions in reverse mode.")); |
949dc678 | 523 | |
0b9dfe2b MD |
524 | frame = get_current_frame (); |
525 | gdbarch = get_frame_arch (frame); | |
526 | ||
527 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 528 | error (_("This target does not support function calls.")); |
a86c5fc9 | 529 | |
b89667eb DE |
530 | /* A cleanup for the inferior status. |
531 | This is only needed while we're preparing the inferior function call. */ | |
16c381f0 JK |
532 | inf_status = save_infcall_control_state (); |
533 | inf_status_cleanup | |
534 | = make_cleanup_restore_infcall_control_state (inf_status); | |
04714b91 | 535 | |
b89667eb DE |
536 | /* Save the caller's registers and other state associated with the |
537 | inferior itself so that they can be restored once the | |
96860204 AC |
538 | callee returns. To allow nested calls the registers are (further |
539 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
540 | is tossed once the regcache has been pushed). */ | |
16c381f0 JK |
541 | caller_state = save_infcall_suspend_state (); |
542 | make_cleanup_restore_infcall_suspend_state (caller_state); | |
04714b91 | 543 | |
04714b91 | 544 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 545 | { |
0b9dfe2b | 546 | CORE_ADDR old_sp = get_frame_sp (frame); |
abbb1732 | 547 | |
0b9dfe2b | 548 | if (gdbarch_frame_align_p (gdbarch)) |
ebc7896c | 549 | { |
0b9dfe2b | 550 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
551 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
552 | ABIs, a function can use memory beyond the inner most stack | |
553 | address. AMD64 called that region the "red zone". Skip at | |
554 | least the "red zone" size before allocating any space on | |
555 | the stack. */ | |
0b9dfe2b MD |
556 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
557 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 558 | else |
0b9dfe2b | 559 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 560 | /* Still aligned? */ |
0b9dfe2b | 561 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
562 | /* NOTE: cagney/2002-09-18: |
563 | ||
564 | On a RISC architecture, a void parameterless generic dummy | |
565 | frame (i.e., no parameters, no result) typically does not | |
566 | need to push anything the stack and hence can leave SP and | |
c48a845b | 567 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
568 | not push anything on the stack and, hence, that too can |
569 | leave FP and SP unchanged. As a consequence, a sequence of | |
570 | void parameterless generic dummy frame calls to frameless | |
571 | functions will create a sequence of effectively identical | |
572 | frames (SP, FP and TOS and PC the same). This, not | |
573 | suprisingly, results in what appears to be a stack in an | |
574 | infinite loop --- when GDB tries to find a generic dummy | |
575 | frame on the internal dummy frame stack, it will always | |
576 | find the first one. | |
577 | ||
578 | To avoid this problem, the code below always grows the | |
579 | stack. That way, two dummy frames can never be identical. | |
580 | It does burn a few bytes of stack but that is a small price | |
581 | to pay :-). */ | |
ebc7896c AC |
582 | if (sp == old_sp) |
583 | { | |
0b9dfe2b | 584 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 585 | /* Stack grows down. */ |
0b9dfe2b | 586 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
587 | else |
588 | /* Stack grows up. */ | |
0b9dfe2b | 589 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 590 | } |
0e095b7e JK |
591 | /* SP may have underflown address zero here from OLD_SP. Memory access |
592 | functions will probably fail in such case but that is a target's | |
593 | problem. */ | |
ebc7896c AC |
594 | } |
595 | else | |
a59fe496 AC |
596 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
597 | ||
8b148df9 AC |
598 | Who knows how badly aligned the SP is! |
599 | ||
600 | If the generic dummy frame ends up empty (because nothing is | |
601 | pushed) GDB won't be able to correctly perform back traces. | |
602 | If a target is having trouble with backtraces, first thing to | |
1777feb0 | 603 | do is add FRAME_ALIGN() to the architecture vector. If that |
669fac23 | 604 | fails, try dummy_id(). |
8b148df9 AC |
605 | |
606 | If the ABI specifies a "Red Zone" (see the doco) the code | |
607 | below will quietly trash it. */ | |
ebc7896c | 608 | sp = old_sp; |
6c659fc2 SC |
609 | |
610 | /* Skip over the stack temporaries that might have been generated during | |
611 | the evaluation of an expression. */ | |
612 | if (stack_temporaries) | |
613 | { | |
614 | struct value *lastval; | |
615 | ||
616 | lastval = get_last_thread_stack_temporary (inferior_ptid); | |
617 | if (lastval != NULL) | |
618 | { | |
619 | CORE_ADDR lastval_addr = value_address (lastval); | |
620 | ||
621 | if (gdbarch_inner_than (gdbarch, 1, 2)) | |
622 | { | |
623 | gdb_assert (sp >= lastval_addr); | |
624 | sp = lastval_addr; | |
625 | } | |
626 | else | |
627 | { | |
628 | gdb_assert (sp <= lastval_addr); | |
629 | sp = lastval_addr + TYPE_LENGTH (value_type (lastval)); | |
630 | } | |
631 | ||
632 | if (gdbarch_frame_align_p (gdbarch)) | |
633 | sp = gdbarch_frame_align (gdbarch, sp); | |
634 | } | |
635 | } | |
ebc7896c | 636 | } |
04714b91 | 637 | |
df407dfe | 638 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
639 | if (!values_type) |
640 | values_type = builtin_type (gdbarch)->builtin_int; | |
641 | ||
df407dfe | 642 | CHECK_TYPEDEF (values_type); |
04714b91 | 643 | |
41f1b697 DJ |
644 | /* Are we returning a value using a structure return (passing a |
645 | hidden argument pointing to storage) or a normal value return? | |
646 | There are two cases: language-mandated structure return and | |
647 | target ABI structure return. The variable STRUCT_RETURN only | |
648 | describes the latter. The language version is handled by passing | |
649 | the return location as the first parameter to the function, | |
650 | even preceding "this". This is different from the target | |
651 | ABI version, which is target-specific; for instance, on ia64 | |
652 | the first argument is passed in out0 but the hidden structure | |
653 | return pointer would normally be passed in r8. */ | |
654 | ||
18648a37 | 655 | if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type)) |
41f1b697 | 656 | { |
18648a37 | 657 | hidden_first_param_p = 1; |
04714b91 | 658 | |
41f1b697 DJ |
659 | /* Tell the target specific argument pushing routine not to |
660 | expect a value. */ | |
48319d1f | 661 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
662 | } |
663 | else | |
664 | { | |
6a3a010b | 665 | struct_return = using_struct_return (gdbarch, function, values_type); |
41f1b697 DJ |
666 | target_values_type = values_type; |
667 | } | |
04714b91 | 668 | |
162078c8 NB |
669 | observer_notify_inferior_call_pre (inferior_ptid, funaddr); |
670 | ||
7043d8dc AC |
671 | /* Determine the location of the breakpoint (and possibly other |
672 | stuff) that the called function will return to. The SPARC, for a | |
673 | function returning a structure or union, needs to make space for | |
674 | not just the breakpoint but also an extra word containing the | |
675 | size (?) of the structure being passed. */ | |
676 | ||
0b9dfe2b | 677 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
678 | { |
679 | case ON_STACK: | |
a14dd77e JK |
680 | { |
681 | const gdb_byte *bp_bytes; | |
682 | CORE_ADDR bp_addr_as_address; | |
683 | int bp_size; | |
684 | ||
685 | /* Be careful BP_ADDR is in inferior PC encoding while | |
686 | BP_ADDR_AS_ADDRESS is a plain memory address. */ | |
687 | ||
688 | sp = push_dummy_code (gdbarch, sp, funaddr, args, nargs, | |
689 | target_values_type, &real_pc, &bp_addr, | |
690 | get_current_regcache ()); | |
691 | ||
692 | /* Write a legitimate instruction at the point where the infcall | |
693 | breakpoint is going to be inserted. While this instruction | |
694 | is never going to be executed, a user investigating the | |
695 | memory from GDB would see this instruction instead of random | |
696 | uninitialized bytes. We chose the breakpoint instruction | |
697 | as it may look as the most logical one to the user and also | |
698 | valgrind 3.7.0 needs it for proper vgdb inferior calls. | |
699 | ||
700 | If software breakpoints are unsupported for this target we | |
701 | leave the user visible memory content uninitialized. */ | |
702 | ||
703 | bp_addr_as_address = bp_addr; | |
704 | bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address, | |
705 | &bp_size); | |
706 | if (bp_bytes != NULL) | |
707 | write_memory (bp_addr_as_address, bp_bytes, bp_size); | |
708 | } | |
7043d8dc | 709 | break; |
5931a2fa JK |
710 | case AT_ENTRY_POINT: |
711 | { | |
712 | CORE_ADDR dummy_addr; | |
713 | ||
714 | real_pc = funaddr; | |
715 | dummy_addr = entry_point_address (); | |
a14dd77e | 716 | |
5931a2fa | 717 | /* A call dummy always consists of just a single breakpoint, so |
a14dd77e JK |
718 | its address is the same as the address of the dummy. |
719 | ||
720 | The actual breakpoint is inserted separatly so there is no need to | |
721 | write that out. */ | |
5931a2fa JK |
722 | bp_addr = dummy_addr; |
723 | break; | |
724 | } | |
04714b91 | 725 | default: |
e2e0b3e5 | 726 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
727 | } |
728 | ||
04714b91 | 729 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 730 | error (_("Too few arguments in function call.")); |
04714b91 | 731 | |
ebc7896c AC |
732 | { |
733 | int i; | |
abbb1732 | 734 | |
ebc7896c AC |
735 | for (i = nargs - 1; i >= 0; i--) |
736 | { | |
737 | int prototyped; | |
738 | struct type *param_type; | |
739 | ||
740 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
741 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
742 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
743 | prototyped = 1; | |
744 | else if (i < TYPE_NFIELDS (ftype)) | |
745 | prototyped = TYPE_PROTOTYPED (ftype); | |
746 | else | |
747 | prototyped = 0; | |
748 | ||
749 | if (i < TYPE_NFIELDS (ftype)) | |
750 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
751 | else | |
752 | param_type = NULL; | |
41f1b697 | 753 | |
7788af6d UW |
754 | args[i] = value_arg_coerce (gdbarch, args[i], |
755 | param_type, prototyped, &sp); | |
ebc7896c | 756 | |
41f1b697 DJ |
757 | if (param_type != NULL && language_pass_by_reference (param_type)) |
758 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
759 | } |
760 | } | |
04714b91 | 761 | |
04714b91 AC |
762 | /* Reserve space for the return structure to be written on the |
763 | stack, if necessary. Make certain that the value is correctly | |
6c659fc2 SC |
764 | aligned. |
765 | ||
766 | While evaluating expressions, we reserve space on the stack for | |
767 | return values of class type even if the language ABI and the target | |
768 | ABI do not require that the return value be passed as a hidden first | |
769 | argument. This is because we want to store the return value as an | |
770 | on-stack temporary while the expression is being evaluated. This | |
771 | enables us to have chained function calls in expressions. | |
04714b91 | 772 | |
6c659fc2 SC |
773 | Keeping the return values as on-stack temporaries while the expression |
774 | is being evaluated is OK because the thread is stopped until the | |
775 | expression is completely evaluated. */ | |
776 | ||
777 | if (struct_return || hidden_first_param_p | |
778 | || (stack_temporaries && class_or_union_p (values_type))) | |
04714b91 | 779 | { |
0b9dfe2b | 780 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
781 | { |
782 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
783 | making space for the return value. */ | |
744a8059 | 784 | sp -= TYPE_LENGTH (values_type); |
0b9dfe2b MD |
785 | if (gdbarch_frame_align_p (gdbarch)) |
786 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
787 | struct_addr = sp; |
788 | } | |
789 | else | |
790 | { | |
791 | /* Stack grows upward. Align the frame, allocate space, and | |
1777feb0 | 792 | then again, re-align the frame??? */ |
0b9dfe2b MD |
793 | if (gdbarch_frame_align_p (gdbarch)) |
794 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 | 795 | struct_addr = sp; |
744a8059 | 796 | sp += TYPE_LENGTH (values_type); |
0b9dfe2b MD |
797 | if (gdbarch_frame_align_p (gdbarch)) |
798 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
799 | } |
800 | } | |
801 | ||
18648a37 | 802 | if (hidden_first_param_p) |
41f1b697 DJ |
803 | { |
804 | struct value **new_args; | |
805 | ||
806 | /* Add the new argument to the front of the argument list. */ | |
807 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
808 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
809 | struct_addr); | |
810 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
811 | args = new_args; | |
812 | nargs++; | |
813 | args_cleanup = make_cleanup (xfree, args); | |
814 | } | |
815 | else | |
816 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
817 | ||
04714b91 AC |
818 | /* Create the dummy stack frame. Pass in the call dummy address as, |
819 | presumably, the ABI code knows where, in the call dummy, the | |
820 | return address should be pointed. */ | |
0b9dfe2b MD |
821 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
822 | bp_addr, nargs, args, | |
594f7785 | 823 | sp, struct_return, struct_addr); |
04714b91 | 824 | |
41f1b697 DJ |
825 | do_cleanups (args_cleanup); |
826 | ||
96860204 AC |
827 | /* Set up a frame ID for the dummy frame so we can pass it to |
828 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
829 | ID so that the breakpoint code can correctly re-identify the | |
830 | dummy breakpoint. */ | |
8241eaa6 | 831 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 832 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 833 | the frame ID's stack address. */ |
96860204 | 834 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 835 | |
74cfe982 AC |
836 | /* Create a momentary breakpoint at the return address of the |
837 | inferior. That way it breaks when it returns. */ | |
04714b91 | 838 | |
74cfe982 | 839 | { |
e2e4d78b | 840 | struct breakpoint *bpt, *longjmp_b; |
74cfe982 | 841 | struct symtab_and_line sal; |
abbb1732 | 842 | |
74cfe982 | 843 | init_sal (&sal); /* initialize to zeroes */ |
6c95b8df | 844 | sal.pspace = current_program_space; |
74cfe982 AC |
845 | sal.pc = bp_addr; |
846 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
847 | /* Sanity. The exact same SP value is returned by |
848 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 849 | dummy_id to form the frame ID's stack address. */ |
a6d9a66e | 850 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
c70a6932 JK |
851 | |
852 | /* set_momentary_breakpoint invalidates FRAME. */ | |
853 | frame = NULL; | |
854 | ||
74cfe982 | 855 | bpt->disposition = disp_del; |
e2e4d78b JK |
856 | gdb_assert (bpt->related_breakpoint == bpt); |
857 | ||
858 | longjmp_b = set_longjmp_breakpoint_for_call_dummy (); | |
859 | if (longjmp_b) | |
860 | { | |
861 | /* Link BPT into the chain of LONGJMP_B. */ | |
862 | bpt->related_breakpoint = longjmp_b; | |
863 | while (longjmp_b->related_breakpoint != bpt->related_breakpoint) | |
864 | longjmp_b = longjmp_b->related_breakpoint; | |
865 | longjmp_b->related_breakpoint = bpt; | |
866 | } | |
74cfe982 | 867 | } |
04714b91 | 868 | |
7cd1089b PM |
869 | /* Create a breakpoint in std::terminate. |
870 | If a C++ exception is raised in the dummy-frame, and the | |
871 | exception handler is (normally, and expected to be) out-of-frame, | |
872 | the default C++ handler will (wrongly) be called in an inferior | |
873 | function call. This is wrong, as an exception can be normally | |
874 | and legally handled out-of-frame. The confines of the dummy frame | |
875 | prevent the unwinder from finding the correct handler (or any | |
876 | handler, unless it is in-frame). The default handler calls | |
877 | std::terminate. This will kill the inferior. Assert that | |
878 | terminate should never be called in an inferior function | |
879 | call. Place a momentary breakpoint in the std::terminate function | |
880 | and if triggered in the call, rewind. */ | |
881 | if (unwind_on_terminating_exception_p) | |
aa7d318d | 882 | set_std_terminate_breakpoint (); |
7cd1089b | 883 | |
96860204 AC |
884 | /* Everything's ready, push all the info needed to restore the |
885 | caller (and identify the dummy-frame) onto the dummy-frame | |
886 | stack. */ | |
b67a2c6f | 887 | dummy_frame_push (caller_state, &dummy_id, inferior_ptid); |
ed12ef62 JK |
888 | if (dummy_dtor != NULL) |
889 | register_dummy_frame_dtor (dummy_id, inferior_ptid, | |
890 | dummy_dtor, dummy_dtor_data); | |
b89667eb DE |
891 | |
892 | /* Discard both inf_status and caller_state cleanups. | |
893 | From this point on we explicitly restore the associated state | |
894 | or discard it. */ | |
895 | discard_cleanups (inf_status_cleanup); | |
96860204 | 896 | |
7cd1089b | 897 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
aa7d318d TT |
898 | terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, |
899 | NULL); | |
7cd1089b | 900 | |
96860204 AC |
901 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
902 | If you're looking to implement asynchronous dummy-frames, then | |
903 | just below is the place to chop this function in two.. */ | |
904 | ||
b89667eb DE |
905 | /* TP is invalid after run_inferior_call returns, so enclose this |
906 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 907 | { |
32400beb | 908 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 909 | |
b89667eb DE |
910 | /* Save this thread's ptid, we need it later but the thread |
911 | may have exited. */ | |
912 | call_thread_ptid = tp->ptid; | |
74cfe982 | 913 | |
b89667eb | 914 | /* Run the inferior until it stops. */ |
f5871ec0 | 915 | |
b89667eb | 916 | e = run_inferior_call (tp, real_pc); |
52557533 | 917 | } |
04714b91 | 918 | |
162078c8 NB |
919 | observer_notify_inferior_call_post (call_thread_ptid, funaddr); |
920 | ||
b89667eb DE |
921 | /* Rethrow an error if we got one trying to run the inferior. */ |
922 | ||
923 | if (e.reason < 0) | |
924 | { | |
925 | const char *name = get_function_name (funaddr, | |
926 | name_buf, sizeof (name_buf)); | |
927 | ||
16c381f0 | 928 | discard_infcall_control_state (inf_status); |
b89667eb DE |
929 | |
930 | /* We could discard the dummy frame here if the program exited, | |
931 | but it will get garbage collected the next time the program is | |
932 | run anyway. */ | |
933 | ||
934 | switch (e.reason) | |
935 | { | |
936 | case RETURN_ERROR: | |
ac74f770 MS |
937 | throw_error (e.error, _("%s\n\ |
938 | An error occurred while in a function called from GDB.\n\ | |
939 | Evaluation of the expression containing the function\n\ | |
940 | (%s) will be abandoned.\n\ | |
941 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
942 | e.message, name); |
943 | case RETURN_QUIT: | |
944 | default: | |
945 | throw_exception (e); | |
946 | } | |
947 | } | |
948 | ||
949 | /* If the program has exited, or we stopped at a different thread, | |
950 | exit and inform the user. */ | |
951 | ||
de04a248 DE |
952 | if (! target_has_execution) |
953 | { | |
b89667eb DE |
954 | const char *name = get_function_name (funaddr, |
955 | name_buf, sizeof (name_buf)); | |
956 | ||
957 | /* If we try to restore the inferior status, | |
de04a248 | 958 | we'll crash as the inferior is no longer running. */ |
16c381f0 | 959 | discard_infcall_control_state (inf_status); |
b89667eb DE |
960 | |
961 | /* We could discard the dummy frame here given that the program exited, | |
962 | but it will get garbage collected the next time the program is | |
963 | run anyway. */ | |
964 | ||
3e43a32a MS |
965 | error (_("The program being debugged exited while in a function " |
966 | "called from GDB.\n" | |
967 | "Evaluation of the expression containing the function\n" | |
968 | "(%s) will be abandoned."), | |
b89667eb DE |
969 | name); |
970 | } | |
971 | ||
972 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
973 | { | |
974 | const char *name = get_function_name (funaddr, | |
975 | name_buf, sizeof (name_buf)); | |
976 | ||
977 | /* We've switched threads. This can happen if another thread gets a | |
978 | signal or breakpoint while our thread was running. | |
979 | There's no point in restoring the inferior status, | |
980 | we're in a different thread. */ | |
16c381f0 | 981 | discard_infcall_control_state (inf_status); |
b89667eb DE |
982 | /* Keep the dummy frame record, if the user switches back to the |
983 | thread with the hand-call, we'll need it. */ | |
984 | if (stopped_by_random_signal) | |
ac74f770 MS |
985 | error (_("\ |
986 | The program received a signal in another thread while\n\ | |
987 | making a function call from GDB.\n\ | |
988 | Evaluation of the expression containing the function\n\ | |
989 | (%s) will be abandoned.\n\ | |
990 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
991 | name); |
992 | else | |
ac74f770 MS |
993 | error (_("\ |
994 | The program stopped in another thread while making a function call from GDB.\n\ | |
995 | Evaluation of the expression containing the function\n\ | |
996 | (%s) will be abandoned.\n\ | |
997 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 998 | name); |
de04a248 DE |
999 | } |
1000 | ||
aa7d318d | 1001 | if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY) |
52557533 | 1002 | { |
b89667eb DE |
1003 | const char *name = get_function_name (funaddr, |
1004 | name_buf, sizeof (name_buf)); | |
1005 | ||
52557533 AC |
1006 | if (stopped_by_random_signal) |
1007 | { | |
1008 | /* We stopped inside the FUNCTION because of a random | |
1009 | signal. Further execution of the FUNCTION is not | |
1777feb0 | 1010 | allowed. */ |
04714b91 | 1011 | |
52557533 AC |
1012 | if (unwind_on_signal_p) |
1013 | { | |
1777feb0 | 1014 | /* The user wants the context restored. */ |
52557533 AC |
1015 | |
1016 | /* We must get back to the frame we were before the | |
b89667eb | 1017 | dummy call. */ |
b67a2c6f | 1018 | dummy_frame_pop (dummy_id, call_thread_ptid); |
b89667eb DE |
1019 | |
1020 | /* We also need to restore inferior status to that before the | |
1021 | dummy call. */ | |
16c381f0 | 1022 | restore_infcall_control_state (inf_status); |
04714b91 | 1023 | |
52557533 AC |
1024 | /* FIXME: Insert a bunch of wrap_here; name can be very |
1025 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1026 | error (_("\ |
1027 | The program being debugged was signaled while in a function called from GDB.\n\ | |
1028 | GDB has restored the context to what it was before the call.\n\ | |
1029 | To change this behavior use \"set unwindonsignal off\".\n\ | |
1030 | Evaluation of the expression containing the function\n\ | |
1031 | (%s) will be abandoned."), | |
52557533 AC |
1032 | name); |
1033 | } | |
1034 | else | |
1035 | { | |
1036 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
1037 | (default). |
1038 | Discard inferior status, we're not at the same point | |
1039 | we started at. */ | |
16c381f0 | 1040 | discard_infcall_control_state (inf_status); |
b89667eb | 1041 | |
52557533 AC |
1042 | /* FIXME: Insert a bunch of wrap_here; name can be very |
1043 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1044 | error (_("\ |
1045 | The program being debugged was signaled while in a function called from GDB.\n\ | |
1046 | GDB remains in the frame where the signal was received.\n\ | |
1047 | To change this behavior use \"set unwindonsignal on\".\n\ | |
1048 | Evaluation of the expression containing the function\n\ | |
1049 | (%s) will be abandoned.\n\ | |
1050 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
1051 | name); |
1052 | } | |
1053 | } | |
04714b91 | 1054 | |
aa7d318d | 1055 | if (stop_stack_dummy == STOP_STD_TERMINATE) |
52557533 | 1056 | { |
aa7d318d TT |
1057 | /* We must get back to the frame we were before the dummy |
1058 | call. */ | |
b67a2c6f | 1059 | dummy_frame_pop (dummy_id, call_thread_ptid); |
7cd1089b | 1060 | |
aa7d318d TT |
1061 | /* We also need to restore inferior status to that before |
1062 | the dummy call. */ | |
16c381f0 | 1063 | restore_infcall_control_state (inf_status); |
aa7d318d | 1064 | |
ac74f770 MS |
1065 | error (_("\ |
1066 | The program being debugged entered a std::terminate call, most likely\n\ | |
1067 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
1068 | to prevent the program from being terminated, and has restored the\n\ | |
1069 | context to its original state before the call.\n\ | |
1070 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
1071 | Evaluation of the expression containing the function (%s)\n\ | |
1072 | will be abandoned."), | |
aa7d318d TT |
1073 | name); |
1074 | } | |
1075 | else if (stop_stack_dummy == STOP_NONE) | |
1076 | { | |
1077 | ||
b89667eb DE |
1078 | /* We hit a breakpoint inside the FUNCTION. |
1079 | Keep the dummy frame, the user may want to examine its state. | |
1080 | Discard inferior status, we're not at the same point | |
1081 | we started at. */ | |
16c381f0 | 1082 | discard_infcall_control_state (inf_status); |
b89667eb | 1083 | |
52557533 AC |
1084 | /* The following error message used to say "The expression |
1085 | which contained the function call has been discarded." | |
1086 | It is a hard concept to explain in a few words. Ideally, | |
1087 | GDB would be able to resume evaluation of the expression | |
1088 | when the function finally is done executing. Perhaps | |
1089 | someday this will be implemented (it would not be easy). */ | |
1090 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
1091 | a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1092 | error (_("\ |
1093 | The program being debugged stopped while in a function called from GDB.\n\ | |
1094 | Evaluation of the expression containing the function\n\ | |
1095 | (%s) will be abandoned.\n\ | |
1096 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 1097 | name); |
52557533 AC |
1098 | } |
1099 | ||
1100 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 1101 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 1102 | } |
04714b91 | 1103 | |
aa7d318d | 1104 | do_cleanups (terminate_bp_cleanup); |
2f2da8f6 | 1105 | |
b89667eb DE |
1106 | /* If we get here the called FUNCTION ran to completion, |
1107 | and the dummy frame has already been popped. */ | |
74cfe982 | 1108 | |
44e5158b | 1109 | { |
d37346f0 DJ |
1110 | struct address_space *aspace = get_regcache_aspace (stop_registers); |
1111 | struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); | |
b89667eb | 1112 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); |
1a4d7a36 MK |
1113 | struct value *retval = NULL; |
1114 | ||
b89667eb DE |
1115 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
1116 | ||
1117 | /* Inferior call is successful. Restore the inferior status. | |
1118 | At this stage, leave the RETBUF alone. */ | |
16c381f0 | 1119 | restore_infcall_control_state (inf_status); |
b89667eb | 1120 | |
6c659fc2 SC |
1121 | if (TYPE_CODE (values_type) == TYPE_CODE_VOID) |
1122 | retval = allocate_value (values_type); | |
1123 | else if (struct_return || hidden_first_param_p) | |
44e5158b | 1124 | { |
6c659fc2 SC |
1125 | if (stack_temporaries) |
1126 | { | |
1127 | retval = value_from_contents_and_address (values_type, NULL, | |
1128 | struct_addr); | |
1129 | push_thread_stack_temporary (inferior_ptid, retval); | |
1130 | } | |
1131 | else | |
1a4d7a36 | 1132 | { |
6c659fc2 | 1133 | retval = allocate_value (values_type); |
81b4675a UW |
1134 | read_value_memory (retval, 0, 1, struct_addr, |
1135 | value_contents_raw (retval), | |
1136 | TYPE_LENGTH (values_type)); | |
6c659fc2 SC |
1137 | } |
1138 | } | |
1139 | else | |
1140 | { | |
1141 | retval = allocate_value (values_type); | |
1142 | gdbarch_return_value (gdbarch, function, values_type, | |
1143 | retbuf, value_contents_raw (retval), NULL); | |
1144 | if (stack_temporaries && class_or_union_p (values_type)) | |
1145 | { | |
1146 | /* Values of class type returned in registers are copied onto | |
1147 | the stack and their lval_type set to lval_memory. This is | |
1148 | required because further evaluation of the expression | |
1149 | could potentially invoke methods on the return value | |
1150 | requiring GDB to evaluate the "this" pointer. To evaluate | |
1151 | the this pointer, GDB needs the memory address of the | |
1152 | value. */ | |
1153 | value_force_lval (retval, struct_addr); | |
1154 | push_thread_stack_temporary (inferior_ptid, retval); | |
1a4d7a36 MK |
1155 | } |
1156 | } | |
1157 | ||
44e5158b | 1158 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 1159 | |
b89667eb | 1160 | gdb_assert (retval); |
44e5158b AC |
1161 | return retval; |
1162 | } | |
04714b91 | 1163 | } |
1a4d7a36 | 1164 | \f |
04714b91 | 1165 | |
1a4d7a36 | 1166 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
1167 | void _initialize_infcall (void); |
1168 | ||
1169 | void | |
1170 | _initialize_infcall (void) | |
1171 | { | |
1172 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1173 | &coerce_float_to_double_p, _("\ |
1174 | Set coercion of floats to doubles when calling functions."), _("\ | |
1175 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1176 | Variables of type float should generally be converted to doubles before\n\ |
1177 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1178 | function. However, some older debug info formats do not provide enough\n\ | |
1179 | information to determine that a function is prototyped. If this flag is\n\ | |
1180 | set, GDB will perform the conversion for a function it considers\n\ | |
1181 | unprototyped.\n\ | |
7915a72c | 1182 | The default is to perform the conversion.\n"), |
2c5b56ce | 1183 | NULL, |
920d2a44 | 1184 | show_coerce_float_to_double_p, |
2c5b56ce | 1185 | &setlist, &showlist); |
04714b91 AC |
1186 | |
1187 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1188 | &unwind_on_signal_p, _("\ |
1189 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1190 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1191 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1192 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1193 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1194 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1195 | NULL, |
920d2a44 | 1196 | show_unwind_on_signal_p, |
2c5b56ce | 1197 | &setlist, &showlist); |
7cd1089b PM |
1198 | |
1199 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1200 | &unwind_on_terminating_exception_p, _("\ | |
1201 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
3e43a32a MS |
1202 | Show unwinding of stack if std::terminate() is called while in a call dummy."), |
1203 | _("\ | |
7cd1089b PM |
1204 | The unwind on terminating exception flag lets the user determine\n\ |
1205 | what gdb should do if a std::terminate() call is made from the\n\ | |
1206 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1207 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1208 | std::terminate call to proceed.\n\ | |
1209 | The default is to unwind the frame."), | |
1210 | NULL, | |
1211 | show_unwind_on_terminating_exception_p, | |
1212 | &setlist, &showlist); | |
1213 | ||
04714b91 | 1214 | } |