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]; |
6c659fc2 | 498 | int stack_temporaries = thread_stack_temporaries_enabled_p (inferior_ptid); |
04714b91 | 499 | |
4c850810 DJ |
500 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
501 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
502 | ||
04714b91 AC |
503 | if (!target_has_execution) |
504 | noprocess (); | |
505 | ||
573cda03 SS |
506 | if (get_traceframe_number () >= 0) |
507 | error (_("May not call functions while looking at trace frames.")); | |
508 | ||
949dc678 | 509 | if (execution_direction == EXEC_REVERSE) |
c2949be0 | 510 | error (_("Cannot call functions in reverse mode.")); |
949dc678 | 511 | |
0b9dfe2b MD |
512 | frame = get_current_frame (); |
513 | gdbarch = get_frame_arch (frame); | |
514 | ||
515 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 516 | error (_("This target does not support function calls.")); |
a86c5fc9 | 517 | |
b89667eb DE |
518 | /* A cleanup for the inferior status. |
519 | This is only needed while we're preparing the inferior function call. */ | |
16c381f0 JK |
520 | inf_status = save_infcall_control_state (); |
521 | inf_status_cleanup | |
522 | = make_cleanup_restore_infcall_control_state (inf_status); | |
04714b91 | 523 | |
b89667eb DE |
524 | /* Save the caller's registers and other state associated with the |
525 | inferior itself so that they can be restored once the | |
96860204 AC |
526 | callee returns. To allow nested calls the registers are (further |
527 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
528 | is tossed once the regcache has been pushed). */ | |
16c381f0 JK |
529 | caller_state = save_infcall_suspend_state (); |
530 | make_cleanup_restore_infcall_suspend_state (caller_state); | |
04714b91 | 531 | |
04714b91 | 532 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 533 | { |
0b9dfe2b | 534 | CORE_ADDR old_sp = get_frame_sp (frame); |
abbb1732 | 535 | |
0b9dfe2b | 536 | if (gdbarch_frame_align_p (gdbarch)) |
ebc7896c | 537 | { |
0b9dfe2b | 538 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
539 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
540 | ABIs, a function can use memory beyond the inner most stack | |
541 | address. AMD64 called that region the "red zone". Skip at | |
542 | least the "red zone" size before allocating any space on | |
543 | the stack. */ | |
0b9dfe2b MD |
544 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
545 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 546 | else |
0b9dfe2b | 547 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 548 | /* Still aligned? */ |
0b9dfe2b | 549 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
550 | /* NOTE: cagney/2002-09-18: |
551 | ||
552 | On a RISC architecture, a void parameterless generic dummy | |
553 | frame (i.e., no parameters, no result) typically does not | |
554 | need to push anything the stack and hence can leave SP and | |
c48a845b | 555 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
556 | not push anything on the stack and, hence, that too can |
557 | leave FP and SP unchanged. As a consequence, a sequence of | |
558 | void parameterless generic dummy frame calls to frameless | |
559 | functions will create a sequence of effectively identical | |
560 | frames (SP, FP and TOS and PC the same). This, not | |
561 | suprisingly, results in what appears to be a stack in an | |
562 | infinite loop --- when GDB tries to find a generic dummy | |
563 | frame on the internal dummy frame stack, it will always | |
564 | find the first one. | |
565 | ||
566 | To avoid this problem, the code below always grows the | |
567 | stack. That way, two dummy frames can never be identical. | |
568 | It does burn a few bytes of stack but that is a small price | |
569 | to pay :-). */ | |
ebc7896c AC |
570 | if (sp == old_sp) |
571 | { | |
0b9dfe2b | 572 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 573 | /* Stack grows down. */ |
0b9dfe2b | 574 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
575 | else |
576 | /* Stack grows up. */ | |
0b9dfe2b | 577 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 578 | } |
0e095b7e JK |
579 | /* SP may have underflown address zero here from OLD_SP. Memory access |
580 | functions will probably fail in such case but that is a target's | |
581 | problem. */ | |
ebc7896c AC |
582 | } |
583 | else | |
a59fe496 AC |
584 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
585 | ||
8b148df9 AC |
586 | Who knows how badly aligned the SP is! |
587 | ||
588 | If the generic dummy frame ends up empty (because nothing is | |
589 | pushed) GDB won't be able to correctly perform back traces. | |
590 | If a target is having trouble with backtraces, first thing to | |
1777feb0 | 591 | do is add FRAME_ALIGN() to the architecture vector. If that |
669fac23 | 592 | fails, try dummy_id(). |
8b148df9 AC |
593 | |
594 | If the ABI specifies a "Red Zone" (see the doco) the code | |
595 | below will quietly trash it. */ | |
ebc7896c | 596 | sp = old_sp; |
6c659fc2 SC |
597 | |
598 | /* Skip over the stack temporaries that might have been generated during | |
599 | the evaluation of an expression. */ | |
600 | if (stack_temporaries) | |
601 | { | |
602 | struct value *lastval; | |
603 | ||
604 | lastval = get_last_thread_stack_temporary (inferior_ptid); | |
605 | if (lastval != NULL) | |
606 | { | |
607 | CORE_ADDR lastval_addr = value_address (lastval); | |
608 | ||
609 | if (gdbarch_inner_than (gdbarch, 1, 2)) | |
610 | { | |
611 | gdb_assert (sp >= lastval_addr); | |
612 | sp = lastval_addr; | |
613 | } | |
614 | else | |
615 | { | |
616 | gdb_assert (sp <= lastval_addr); | |
617 | sp = lastval_addr + TYPE_LENGTH (value_type (lastval)); | |
618 | } | |
619 | ||
620 | if (gdbarch_frame_align_p (gdbarch)) | |
621 | sp = gdbarch_frame_align (gdbarch, sp); | |
622 | } | |
623 | } | |
ebc7896c | 624 | } |
04714b91 | 625 | |
df407dfe | 626 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
627 | if (!values_type) |
628 | values_type = builtin_type (gdbarch)->builtin_int; | |
629 | ||
df407dfe | 630 | CHECK_TYPEDEF (values_type); |
04714b91 | 631 | |
41f1b697 DJ |
632 | /* Are we returning a value using a structure return (passing a |
633 | hidden argument pointing to storage) or a normal value return? | |
634 | There are two cases: language-mandated structure return and | |
635 | target ABI structure return. The variable STRUCT_RETURN only | |
636 | describes the latter. The language version is handled by passing | |
637 | the return location as the first parameter to the function, | |
638 | even preceding "this". This is different from the target | |
639 | ABI version, which is target-specific; for instance, on ia64 | |
640 | the first argument is passed in out0 but the hidden structure | |
641 | return pointer would normally be passed in r8. */ | |
642 | ||
18648a37 | 643 | if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type)) |
41f1b697 | 644 | { |
18648a37 | 645 | hidden_first_param_p = 1; |
04714b91 | 646 | |
41f1b697 DJ |
647 | /* Tell the target specific argument pushing routine not to |
648 | expect a value. */ | |
48319d1f | 649 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
650 | } |
651 | else | |
652 | { | |
6a3a010b | 653 | struct_return = using_struct_return (gdbarch, function, values_type); |
41f1b697 DJ |
654 | target_values_type = values_type; |
655 | } | |
04714b91 | 656 | |
7043d8dc AC |
657 | /* Determine the location of the breakpoint (and possibly other |
658 | stuff) that the called function will return to. The SPARC, for a | |
659 | function returning a structure or union, needs to make space for | |
660 | not just the breakpoint but also an extra word containing the | |
661 | size (?) of the structure being passed. */ | |
662 | ||
0b9dfe2b | 663 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
664 | { |
665 | case ON_STACK: | |
a14dd77e JK |
666 | { |
667 | const gdb_byte *bp_bytes; | |
668 | CORE_ADDR bp_addr_as_address; | |
669 | int bp_size; | |
670 | ||
671 | /* Be careful BP_ADDR is in inferior PC encoding while | |
672 | BP_ADDR_AS_ADDRESS is a plain memory address. */ | |
673 | ||
674 | sp = push_dummy_code (gdbarch, sp, funaddr, args, nargs, | |
675 | target_values_type, &real_pc, &bp_addr, | |
676 | get_current_regcache ()); | |
677 | ||
678 | /* Write a legitimate instruction at the point where the infcall | |
679 | breakpoint is going to be inserted. While this instruction | |
680 | is never going to be executed, a user investigating the | |
681 | memory from GDB would see this instruction instead of random | |
682 | uninitialized bytes. We chose the breakpoint instruction | |
683 | as it may look as the most logical one to the user and also | |
684 | valgrind 3.7.0 needs it for proper vgdb inferior calls. | |
685 | ||
686 | If software breakpoints are unsupported for this target we | |
687 | leave the user visible memory content uninitialized. */ | |
688 | ||
689 | bp_addr_as_address = bp_addr; | |
690 | bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address, | |
691 | &bp_size); | |
692 | if (bp_bytes != NULL) | |
693 | write_memory (bp_addr_as_address, bp_bytes, bp_size); | |
694 | } | |
7043d8dc | 695 | break; |
5931a2fa JK |
696 | case AT_ENTRY_POINT: |
697 | { | |
698 | CORE_ADDR dummy_addr; | |
699 | ||
700 | real_pc = funaddr; | |
701 | dummy_addr = entry_point_address (); | |
a14dd77e | 702 | |
5931a2fa | 703 | /* A call dummy always consists of just a single breakpoint, so |
a14dd77e JK |
704 | its address is the same as the address of the dummy. |
705 | ||
706 | The actual breakpoint is inserted separatly so there is no need to | |
707 | write that out. */ | |
5931a2fa JK |
708 | bp_addr = dummy_addr; |
709 | break; | |
710 | } | |
04714b91 | 711 | default: |
e2e0b3e5 | 712 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
713 | } |
714 | ||
04714b91 | 715 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 716 | error (_("Too few arguments in function call.")); |
04714b91 | 717 | |
ebc7896c AC |
718 | { |
719 | int i; | |
abbb1732 | 720 | |
ebc7896c AC |
721 | for (i = nargs - 1; i >= 0; i--) |
722 | { | |
723 | int prototyped; | |
724 | struct type *param_type; | |
725 | ||
726 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
727 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
728 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
729 | prototyped = 1; | |
730 | else if (i < TYPE_NFIELDS (ftype)) | |
731 | prototyped = TYPE_PROTOTYPED (ftype); | |
732 | else | |
733 | prototyped = 0; | |
734 | ||
735 | if (i < TYPE_NFIELDS (ftype)) | |
736 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
737 | else | |
738 | param_type = NULL; | |
41f1b697 | 739 | |
7788af6d UW |
740 | args[i] = value_arg_coerce (gdbarch, args[i], |
741 | param_type, prototyped, &sp); | |
ebc7896c | 742 | |
41f1b697 DJ |
743 | if (param_type != NULL && language_pass_by_reference (param_type)) |
744 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
745 | } |
746 | } | |
04714b91 | 747 | |
04714b91 AC |
748 | /* Reserve space for the return structure to be written on the |
749 | stack, if necessary. Make certain that the value is correctly | |
6c659fc2 SC |
750 | aligned. |
751 | ||
752 | While evaluating expressions, we reserve space on the stack for | |
753 | return values of class type even if the language ABI and the target | |
754 | ABI do not require that the return value be passed as a hidden first | |
755 | argument. This is because we want to store the return value as an | |
756 | on-stack temporary while the expression is being evaluated. This | |
757 | enables us to have chained function calls in expressions. | |
04714b91 | 758 | |
6c659fc2 SC |
759 | Keeping the return values as on-stack temporaries while the expression |
760 | is being evaluated is OK because the thread is stopped until the | |
761 | expression is completely evaluated. */ | |
762 | ||
763 | if (struct_return || hidden_first_param_p | |
764 | || (stack_temporaries && class_or_union_p (values_type))) | |
04714b91 | 765 | { |
0b9dfe2b | 766 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
767 | { |
768 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
769 | making space for the return value. */ | |
744a8059 | 770 | sp -= TYPE_LENGTH (values_type); |
0b9dfe2b MD |
771 | if (gdbarch_frame_align_p (gdbarch)) |
772 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
773 | struct_addr = sp; |
774 | } | |
775 | else | |
776 | { | |
777 | /* Stack grows upward. Align the frame, allocate space, and | |
1777feb0 | 778 | then again, re-align the frame??? */ |
0b9dfe2b MD |
779 | if (gdbarch_frame_align_p (gdbarch)) |
780 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 | 781 | struct_addr = sp; |
744a8059 | 782 | sp += TYPE_LENGTH (values_type); |
0b9dfe2b MD |
783 | if (gdbarch_frame_align_p (gdbarch)) |
784 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
785 | } |
786 | } | |
787 | ||
18648a37 | 788 | if (hidden_first_param_p) |
41f1b697 DJ |
789 | { |
790 | struct value **new_args; | |
791 | ||
792 | /* Add the new argument to the front of the argument list. */ | |
793 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
794 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
795 | struct_addr); | |
796 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
797 | args = new_args; | |
798 | nargs++; | |
799 | args_cleanup = make_cleanup (xfree, args); | |
800 | } | |
801 | else | |
802 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
803 | ||
04714b91 AC |
804 | /* Create the dummy stack frame. Pass in the call dummy address as, |
805 | presumably, the ABI code knows where, in the call dummy, the | |
806 | return address should be pointed. */ | |
0b9dfe2b MD |
807 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
808 | bp_addr, nargs, args, | |
594f7785 | 809 | sp, struct_return, struct_addr); |
04714b91 | 810 | |
41f1b697 DJ |
811 | do_cleanups (args_cleanup); |
812 | ||
96860204 AC |
813 | /* Set up a frame ID for the dummy frame so we can pass it to |
814 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
815 | ID so that the breakpoint code can correctly re-identify the | |
816 | dummy breakpoint. */ | |
8241eaa6 | 817 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 818 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 819 | the frame ID's stack address. */ |
96860204 | 820 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 821 | |
74cfe982 AC |
822 | /* Create a momentary breakpoint at the return address of the |
823 | inferior. That way it breaks when it returns. */ | |
04714b91 | 824 | |
74cfe982 | 825 | { |
e2e4d78b | 826 | struct breakpoint *bpt, *longjmp_b; |
74cfe982 | 827 | struct symtab_and_line sal; |
abbb1732 | 828 | |
74cfe982 | 829 | init_sal (&sal); /* initialize to zeroes */ |
6c95b8df | 830 | sal.pspace = current_program_space; |
74cfe982 AC |
831 | sal.pc = bp_addr; |
832 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
833 | /* Sanity. The exact same SP value is returned by |
834 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 835 | dummy_id to form the frame ID's stack address. */ |
a6d9a66e | 836 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
c70a6932 JK |
837 | |
838 | /* set_momentary_breakpoint invalidates FRAME. */ | |
839 | frame = NULL; | |
840 | ||
74cfe982 | 841 | bpt->disposition = disp_del; |
e2e4d78b JK |
842 | gdb_assert (bpt->related_breakpoint == bpt); |
843 | ||
844 | longjmp_b = set_longjmp_breakpoint_for_call_dummy (); | |
845 | if (longjmp_b) | |
846 | { | |
847 | /* Link BPT into the chain of LONGJMP_B. */ | |
848 | bpt->related_breakpoint = longjmp_b; | |
849 | while (longjmp_b->related_breakpoint != bpt->related_breakpoint) | |
850 | longjmp_b = longjmp_b->related_breakpoint; | |
851 | longjmp_b->related_breakpoint = bpt; | |
852 | } | |
74cfe982 | 853 | } |
04714b91 | 854 | |
7cd1089b PM |
855 | /* Create a breakpoint in std::terminate. |
856 | If a C++ exception is raised in the dummy-frame, and the | |
857 | exception handler is (normally, and expected to be) out-of-frame, | |
858 | the default C++ handler will (wrongly) be called in an inferior | |
859 | function call. This is wrong, as an exception can be normally | |
860 | and legally handled out-of-frame. The confines of the dummy frame | |
861 | prevent the unwinder from finding the correct handler (or any | |
862 | handler, unless it is in-frame). The default handler calls | |
863 | std::terminate. This will kill the inferior. Assert that | |
864 | terminate should never be called in an inferior function | |
865 | call. Place a momentary breakpoint in the std::terminate function | |
866 | and if triggered in the call, rewind. */ | |
867 | if (unwind_on_terminating_exception_p) | |
aa7d318d | 868 | set_std_terminate_breakpoint (); |
7cd1089b | 869 | |
96860204 AC |
870 | /* Everything's ready, push all the info needed to restore the |
871 | caller (and identify the dummy-frame) onto the dummy-frame | |
872 | stack. */ | |
b67a2c6f | 873 | dummy_frame_push (caller_state, &dummy_id, inferior_ptid); |
b89667eb DE |
874 | |
875 | /* Discard both inf_status and caller_state cleanups. | |
876 | From this point on we explicitly restore the associated state | |
877 | or discard it. */ | |
878 | discard_cleanups (inf_status_cleanup); | |
96860204 | 879 | |
7cd1089b | 880 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
aa7d318d TT |
881 | terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, |
882 | NULL); | |
7cd1089b | 883 | |
96860204 AC |
884 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
885 | If you're looking to implement asynchronous dummy-frames, then | |
886 | just below is the place to chop this function in two.. */ | |
887 | ||
b89667eb DE |
888 | /* TP is invalid after run_inferior_call returns, so enclose this |
889 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 890 | { |
32400beb | 891 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 892 | |
b89667eb DE |
893 | /* Save this thread's ptid, we need it later but the thread |
894 | may have exited. */ | |
895 | call_thread_ptid = tp->ptid; | |
74cfe982 | 896 | |
b89667eb | 897 | /* Run the inferior until it stops. */ |
f5871ec0 | 898 | |
b89667eb | 899 | e = run_inferior_call (tp, real_pc); |
52557533 | 900 | } |
04714b91 | 901 | |
b89667eb DE |
902 | /* Rethrow an error if we got one trying to run the inferior. */ |
903 | ||
904 | if (e.reason < 0) | |
905 | { | |
906 | const char *name = get_function_name (funaddr, | |
907 | name_buf, sizeof (name_buf)); | |
908 | ||
16c381f0 | 909 | discard_infcall_control_state (inf_status); |
b89667eb DE |
910 | |
911 | /* We could discard the dummy frame here if the program exited, | |
912 | but it will get garbage collected the next time the program is | |
913 | run anyway. */ | |
914 | ||
915 | switch (e.reason) | |
916 | { | |
917 | case RETURN_ERROR: | |
ac74f770 MS |
918 | throw_error (e.error, _("%s\n\ |
919 | An error occurred while in a function called from GDB.\n\ | |
920 | Evaluation of the expression containing the function\n\ | |
921 | (%s) will be abandoned.\n\ | |
922 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
923 | e.message, name); |
924 | case RETURN_QUIT: | |
925 | default: | |
926 | throw_exception (e); | |
927 | } | |
928 | } | |
929 | ||
930 | /* If the program has exited, or we stopped at a different thread, | |
931 | exit and inform the user. */ | |
932 | ||
de04a248 DE |
933 | if (! target_has_execution) |
934 | { | |
b89667eb DE |
935 | const char *name = get_function_name (funaddr, |
936 | name_buf, sizeof (name_buf)); | |
937 | ||
938 | /* If we try to restore the inferior status, | |
de04a248 | 939 | we'll crash as the inferior is no longer running. */ |
16c381f0 | 940 | discard_infcall_control_state (inf_status); |
b89667eb DE |
941 | |
942 | /* We could discard the dummy frame here given that the program exited, | |
943 | but it will get garbage collected the next time the program is | |
944 | run anyway. */ | |
945 | ||
3e43a32a MS |
946 | error (_("The program being debugged exited while in a function " |
947 | "called from GDB.\n" | |
948 | "Evaluation of the expression containing the function\n" | |
949 | "(%s) will be abandoned."), | |
b89667eb DE |
950 | name); |
951 | } | |
952 | ||
953 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
954 | { | |
955 | const char *name = get_function_name (funaddr, | |
956 | name_buf, sizeof (name_buf)); | |
957 | ||
958 | /* We've switched threads. This can happen if another thread gets a | |
959 | signal or breakpoint while our thread was running. | |
960 | There's no point in restoring the inferior status, | |
961 | we're in a different thread. */ | |
16c381f0 | 962 | discard_infcall_control_state (inf_status); |
b89667eb DE |
963 | /* Keep the dummy frame record, if the user switches back to the |
964 | thread with the hand-call, we'll need it. */ | |
965 | if (stopped_by_random_signal) | |
ac74f770 MS |
966 | error (_("\ |
967 | The program received a signal in another thread while\n\ | |
968 | making a function call from GDB.\n\ | |
969 | Evaluation of the expression containing the function\n\ | |
970 | (%s) will be abandoned.\n\ | |
971 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
972 | name); |
973 | else | |
ac74f770 MS |
974 | error (_("\ |
975 | The program stopped in another thread while making a function call from GDB.\n\ | |
976 | Evaluation of the expression containing the function\n\ | |
977 | (%s) will be abandoned.\n\ | |
978 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 979 | name); |
de04a248 DE |
980 | } |
981 | ||
aa7d318d | 982 | if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY) |
52557533 | 983 | { |
b89667eb DE |
984 | const char *name = get_function_name (funaddr, |
985 | name_buf, sizeof (name_buf)); | |
986 | ||
52557533 AC |
987 | if (stopped_by_random_signal) |
988 | { | |
989 | /* We stopped inside the FUNCTION because of a random | |
990 | signal. Further execution of the FUNCTION is not | |
1777feb0 | 991 | allowed. */ |
04714b91 | 992 | |
52557533 AC |
993 | if (unwind_on_signal_p) |
994 | { | |
1777feb0 | 995 | /* The user wants the context restored. */ |
52557533 AC |
996 | |
997 | /* We must get back to the frame we were before the | |
b89667eb | 998 | dummy call. */ |
b67a2c6f | 999 | dummy_frame_pop (dummy_id, call_thread_ptid); |
b89667eb DE |
1000 | |
1001 | /* We also need to restore inferior status to that before the | |
1002 | dummy call. */ | |
16c381f0 | 1003 | restore_infcall_control_state (inf_status); |
04714b91 | 1004 | |
52557533 AC |
1005 | /* FIXME: Insert a bunch of wrap_here; name can be very |
1006 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1007 | error (_("\ |
1008 | The program being debugged was signaled while in a function called from GDB.\n\ | |
1009 | GDB has restored the context to what it was before the call.\n\ | |
1010 | To change this behavior use \"set unwindonsignal off\".\n\ | |
1011 | Evaluation of the expression containing the function\n\ | |
1012 | (%s) will be abandoned."), | |
52557533 AC |
1013 | name); |
1014 | } | |
1015 | else | |
1016 | { | |
1017 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
1018 | (default). |
1019 | Discard inferior status, we're not at the same point | |
1020 | we started at. */ | |
16c381f0 | 1021 | discard_infcall_control_state (inf_status); |
b89667eb | 1022 | |
52557533 AC |
1023 | /* FIXME: Insert a bunch of wrap_here; name can be very |
1024 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1025 | error (_("\ |
1026 | The program being debugged was signaled while in a function called from GDB.\n\ | |
1027 | GDB remains in the frame where the signal was received.\n\ | |
1028 | To change this behavior use \"set unwindonsignal on\".\n\ | |
1029 | Evaluation of the expression containing the function\n\ | |
1030 | (%s) will be abandoned.\n\ | |
1031 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
1032 | name); |
1033 | } | |
1034 | } | |
04714b91 | 1035 | |
aa7d318d | 1036 | if (stop_stack_dummy == STOP_STD_TERMINATE) |
52557533 | 1037 | { |
aa7d318d TT |
1038 | /* We must get back to the frame we were before the dummy |
1039 | call. */ | |
b67a2c6f | 1040 | dummy_frame_pop (dummy_id, call_thread_ptid); |
7cd1089b | 1041 | |
aa7d318d TT |
1042 | /* We also need to restore inferior status to that before |
1043 | the dummy call. */ | |
16c381f0 | 1044 | restore_infcall_control_state (inf_status); |
aa7d318d | 1045 | |
ac74f770 MS |
1046 | error (_("\ |
1047 | The program being debugged entered a std::terminate call, most likely\n\ | |
1048 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
1049 | to prevent the program from being terminated, and has restored the\n\ | |
1050 | context to its original state before the call.\n\ | |
1051 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
1052 | Evaluation of the expression containing the function (%s)\n\ | |
1053 | will be abandoned."), | |
aa7d318d TT |
1054 | name); |
1055 | } | |
1056 | else if (stop_stack_dummy == STOP_NONE) | |
1057 | { | |
1058 | ||
b89667eb DE |
1059 | /* We hit a breakpoint inside the FUNCTION. |
1060 | Keep the dummy frame, the user may want to examine its state. | |
1061 | Discard inferior status, we're not at the same point | |
1062 | we started at. */ | |
16c381f0 | 1063 | discard_infcall_control_state (inf_status); |
b89667eb | 1064 | |
52557533 AC |
1065 | /* The following error message used to say "The expression |
1066 | which contained the function call has been discarded." | |
1067 | It is a hard concept to explain in a few words. Ideally, | |
1068 | GDB would be able to resume evaluation of the expression | |
1069 | when the function finally is done executing. Perhaps | |
1070 | someday this will be implemented (it would not be easy). */ | |
1071 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
1072 | a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1073 | error (_("\ |
1074 | The program being debugged stopped while in a function called from GDB.\n\ | |
1075 | Evaluation of the expression containing the function\n\ | |
1076 | (%s) will be abandoned.\n\ | |
1077 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 1078 | name); |
52557533 AC |
1079 | } |
1080 | ||
1081 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 1082 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 1083 | } |
04714b91 | 1084 | |
aa7d318d | 1085 | do_cleanups (terminate_bp_cleanup); |
2f2da8f6 | 1086 | |
b89667eb DE |
1087 | /* If we get here the called FUNCTION ran to completion, |
1088 | and the dummy frame has already been popped. */ | |
74cfe982 | 1089 | |
44e5158b | 1090 | { |
d37346f0 DJ |
1091 | struct address_space *aspace = get_regcache_aspace (stop_registers); |
1092 | struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); | |
b89667eb | 1093 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); |
1a4d7a36 MK |
1094 | struct value *retval = NULL; |
1095 | ||
b89667eb DE |
1096 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
1097 | ||
1098 | /* Inferior call is successful. Restore the inferior status. | |
1099 | At this stage, leave the RETBUF alone. */ | |
16c381f0 | 1100 | restore_infcall_control_state (inf_status); |
b89667eb | 1101 | |
6c659fc2 SC |
1102 | if (TYPE_CODE (values_type) == TYPE_CODE_VOID) |
1103 | retval = allocate_value (values_type); | |
1104 | else if (struct_return || hidden_first_param_p) | |
44e5158b | 1105 | { |
6c659fc2 SC |
1106 | if (stack_temporaries) |
1107 | { | |
1108 | retval = value_from_contents_and_address (values_type, NULL, | |
1109 | struct_addr); | |
1110 | push_thread_stack_temporary (inferior_ptid, retval); | |
1111 | } | |
1112 | else | |
1a4d7a36 | 1113 | { |
6c659fc2 | 1114 | retval = allocate_value (values_type); |
81b4675a UW |
1115 | read_value_memory (retval, 0, 1, struct_addr, |
1116 | value_contents_raw (retval), | |
1117 | TYPE_LENGTH (values_type)); | |
6c659fc2 SC |
1118 | } |
1119 | } | |
1120 | else | |
1121 | { | |
1122 | retval = allocate_value (values_type); | |
1123 | gdbarch_return_value (gdbarch, function, values_type, | |
1124 | retbuf, value_contents_raw (retval), NULL); | |
1125 | if (stack_temporaries && class_or_union_p (values_type)) | |
1126 | { | |
1127 | /* Values of class type returned in registers are copied onto | |
1128 | the stack and their lval_type set to lval_memory. This is | |
1129 | required because further evaluation of the expression | |
1130 | could potentially invoke methods on the return value | |
1131 | requiring GDB to evaluate the "this" pointer. To evaluate | |
1132 | the this pointer, GDB needs the memory address of the | |
1133 | value. */ | |
1134 | value_force_lval (retval, struct_addr); | |
1135 | push_thread_stack_temporary (inferior_ptid, retval); | |
1a4d7a36 MK |
1136 | } |
1137 | } | |
1138 | ||
44e5158b | 1139 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 1140 | |
b89667eb | 1141 | gdb_assert (retval); |
44e5158b AC |
1142 | return retval; |
1143 | } | |
04714b91 | 1144 | } |
1a4d7a36 | 1145 | \f |
04714b91 | 1146 | |
1a4d7a36 | 1147 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
1148 | void _initialize_infcall (void); |
1149 | ||
1150 | void | |
1151 | _initialize_infcall (void) | |
1152 | { | |
1153 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1154 | &coerce_float_to_double_p, _("\ |
1155 | Set coercion of floats to doubles when calling functions."), _("\ | |
1156 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1157 | Variables of type float should generally be converted to doubles before\n\ |
1158 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1159 | function. However, some older debug info formats do not provide enough\n\ | |
1160 | information to determine that a function is prototyped. If this flag is\n\ | |
1161 | set, GDB will perform the conversion for a function it considers\n\ | |
1162 | unprototyped.\n\ | |
7915a72c | 1163 | The default is to perform the conversion.\n"), |
2c5b56ce | 1164 | NULL, |
920d2a44 | 1165 | show_coerce_float_to_double_p, |
2c5b56ce | 1166 | &setlist, &showlist); |
04714b91 AC |
1167 | |
1168 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1169 | &unwind_on_signal_p, _("\ |
1170 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1171 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1172 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1173 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1174 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1175 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1176 | NULL, |
920d2a44 | 1177 | show_unwind_on_signal_p, |
2c5b56ce | 1178 | &setlist, &showlist); |
7cd1089b PM |
1179 | |
1180 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1181 | &unwind_on_terminating_exception_p, _("\ | |
1182 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
3e43a32a MS |
1183 | Show unwinding of stack if std::terminate() is called while in a call dummy."), |
1184 | _("\ | |
7cd1089b PM |
1185 | The unwind on terminating exception flag lets the user determine\n\ |
1186 | what gdb should do if a std::terminate() call is made from the\n\ | |
1187 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1188 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1189 | std::terminate call to proceed.\n\ | |
1190 | The default is to unwind the frame."), | |
1191 | NULL, | |
1192 | show_unwind_on_terminating_exception_p, | |
1193 | &setlist, &showlist); | |
1194 | ||
04714b91 | 1195 | } |