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 "gdb_assert.h" |
28 | #include "block.h" | |
29 | #include "gdbcore.h" | |
30 | #include "language.h" | |
9ab9195f | 31 | #include "objfiles.h" |
04714b91 AC |
32 | #include "gdbcmd.h" |
33 | #include "command.h" | |
0e9f083f | 34 | #include <string.h> |
b9362cc7 | 35 | #include "infcall.h" |
96860204 | 36 | #include "dummy-frame.h" |
a93c0eb6 | 37 | #include "ada-lang.h" |
347bddb7 | 38 | #include "gdbthread.h" |
b89667eb | 39 | #include "exceptions.h" |
beb460e8 | 40 | #include "event-top.h" |
b89667eb DE |
41 | |
42 | /* If we can't find a function's name from its address, | |
43 | we print this instead. */ | |
44 | #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" | |
45 | #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ | |
46 | + 2 * sizeof (CORE_ADDR)) | |
04714b91 AC |
47 | |
48 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
49 | ||
50 | GDB needs an asynchronous expression evaluator, that means an | |
51 | asynchronous inferior function call implementation, and that in | |
52 | turn means restructuring the code so that it is event driven. */ | |
53 | ||
54 | /* How you should pass arguments to a function depends on whether it | |
55 | was defined in K&R style or prototype style. If you define a | |
56 | function using the K&R syntax that takes a `float' argument, then | |
57 | callers must pass that argument as a `double'. If you define the | |
58 | function using the prototype syntax, then you must pass the | |
59 | argument as a `float', with no promotion. | |
60 | ||
61 | Unfortunately, on certain older platforms, the debug info doesn't | |
62 | indicate reliably how each function was defined. A function type's | |
63 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was | |
64 | defined in prototype style. When calling a function whose | |
65 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to | |
66 | decide what to do. | |
67 | ||
68 | For modern targets, it is proper to assume that, if the prototype | |
69 | flag is clear, that can be trusted: `float' arguments should be | |
70 | promoted to `double'. For some older targets, if the prototype | |
71 | flag is clear, that doesn't tell us anything. The default is to | |
72 | trust the debug information; the user can override this behavior | |
73 | with "set coerce-float-to-double 0". */ | |
74 | ||
75 | static int coerce_float_to_double_p = 1; | |
920d2a44 AC |
76 | static void |
77 | show_coerce_float_to_double_p (struct ui_file *file, int from_tty, | |
78 | struct cmd_list_element *c, const char *value) | |
79 | { | |
3e43a32a MS |
80 | fprintf_filtered (file, |
81 | _("Coercion of floats to doubles " | |
82 | "when calling functions is %s.\n"), | |
920d2a44 AC |
83 | value); |
84 | } | |
04714b91 AC |
85 | |
86 | /* This boolean tells what gdb should do if a signal is received while | |
87 | in a function called from gdb (call dummy). If set, gdb unwinds | |
88 | the stack and restore the context to what as it was before the | |
89 | call. | |
90 | ||
1777feb0 | 91 | The default is to stop in the frame where the signal was received. */ |
04714b91 | 92 | |
ef61f180 | 93 | static int unwind_on_signal_p = 0; |
920d2a44 AC |
94 | static void |
95 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, | |
96 | struct cmd_list_element *c, const char *value) | |
97 | { | |
3e43a32a MS |
98 | fprintf_filtered (file, |
99 | _("Unwinding of stack if a signal is " | |
100 | "received while in a call dummy is %s.\n"), | |
920d2a44 AC |
101 | value); |
102 | } | |
103 | ||
7cd1089b PM |
104 | /* This boolean tells what gdb should do if a std::terminate call is |
105 | made while in a function called from gdb (call dummy). | |
106 | As the confines of a single dummy stack prohibit out-of-frame | |
107 | handlers from handling a raised exception, and as out-of-frame | |
108 | handlers are common in C++, this can lead to no handler being found | |
109 | by the unwinder, and a std::terminate call. This is a false positive. | |
110 | If set, gdb unwinds the stack and restores the context to what it | |
111 | was before the call. | |
112 | ||
113 | The default is to unwind the frame if a std::terminate call is | |
114 | made. */ | |
115 | ||
116 | static int unwind_on_terminating_exception_p = 1; | |
117 | ||
118 | static void | |
119 | show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, | |
120 | struct cmd_list_element *c, | |
121 | const char *value) | |
122 | ||
123 | { | |
3e43a32a MS |
124 | fprintf_filtered (file, |
125 | _("Unwind stack if a C++ exception is " | |
126 | "unhandled while in a call dummy is %s.\n"), | |
7cd1089b PM |
127 | value); |
128 | } | |
04714b91 AC |
129 | |
130 | /* Perform the standard coercions that are specified | |
a93c0eb6 | 131 | for arguments to be passed to C or Ada functions. |
04714b91 AC |
132 | |
133 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
a93c0eb6 JB |
134 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
135 | SP is the stack pointer were additional data can be pushed (updating | |
136 | its value as needed). */ | |
04714b91 AC |
137 | |
138 | static struct value * | |
7788af6d UW |
139 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
140 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) | |
04714b91 | 141 | { |
7788af6d | 142 | const struct builtin_type *builtin = builtin_type (gdbarch); |
df407dfe | 143 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 144 | struct type *type |
04714b91 AC |
145 | = param_type ? check_typedef (param_type) : arg_type; |
146 | ||
a93c0eb6 JB |
147 | /* Perform any Ada-specific coercion first. */ |
148 | if (current_language->la_language == language_ada) | |
40bc484c | 149 | arg = ada_convert_actual (arg, type); |
a93c0eb6 | 150 | |
63092375 DJ |
151 | /* Force the value to the target if we will need its address. At |
152 | this point, we could allocate arguments on the stack instead of | |
153 | calling malloc if we knew that their addresses would not be | |
154 | saved by the called function. */ | |
155 | arg = value_coerce_to_target (arg); | |
156 | ||
04714b91 AC |
157 | switch (TYPE_CODE (type)) |
158 | { | |
159 | case TYPE_CODE_REF: | |
fb933624 DJ |
160 | { |
161 | struct value *new_value; | |
162 | ||
163 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) | |
b1af9e97 | 164 | return value_cast_pointers (type, arg, 0); |
fb933624 DJ |
165 | |
166 | /* Cast the value to the reference's target type, and then | |
167 | convert it back to a reference. This will issue an error | |
168 | if the value was not previously in memory - in some cases | |
169 | we should clearly be allowing this, but how? */ | |
170 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); | |
171 | new_value = value_ref (new_value); | |
172 | return new_value; | |
173 | } | |
04714b91 AC |
174 | case TYPE_CODE_INT: |
175 | case TYPE_CODE_CHAR: | |
176 | case TYPE_CODE_BOOL: | |
177 | case TYPE_CODE_ENUM: | |
178 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
179 | if (!is_prototyped) | |
180 | { | |
7788af6d UW |
181 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
182 | type = builtin->builtin_int; | |
04714b91 AC |
183 | } |
184 | /* Currently all target ABIs require at least the width of an integer | |
185 | type for an argument. We may have to conditionalize the following | |
186 | type coercion for future targets. */ | |
7788af6d UW |
187 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
188 | type = builtin->builtin_int; | |
04714b91 AC |
189 | break; |
190 | case TYPE_CODE_FLT: | |
191 | if (!is_prototyped && coerce_float_to_double_p) | |
192 | { | |
7788af6d UW |
193 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
194 | type = builtin->builtin_double; | |
195 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) | |
196 | type = builtin->builtin_long_double; | |
04714b91 AC |
197 | } |
198 | break; | |
199 | case TYPE_CODE_FUNC: | |
200 | type = lookup_pointer_type (type); | |
201 | break; | |
202 | case TYPE_CODE_ARRAY: | |
203 | /* Arrays are coerced to pointers to their first element, unless | |
204 | they are vectors, in which case we want to leave them alone, | |
205 | because they are passed by value. */ | |
206 | if (current_language->c_style_arrays) | |
207 | if (!TYPE_VECTOR (type)) | |
208 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
209 | break; | |
210 | case TYPE_CODE_UNDEF: | |
211 | case TYPE_CODE_PTR: | |
212 | case TYPE_CODE_STRUCT: | |
213 | case TYPE_CODE_UNION: | |
214 | case TYPE_CODE_VOID: | |
215 | case TYPE_CODE_SET: | |
216 | case TYPE_CODE_RANGE: | |
217 | case TYPE_CODE_STRING: | |
04714b91 | 218 | case TYPE_CODE_ERROR: |
0d5de010 DJ |
219 | case TYPE_CODE_MEMBERPTR: |
220 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
221 | case TYPE_CODE_METHOD: |
222 | case TYPE_CODE_COMPLEX: | |
223 | default: | |
224 | break; | |
225 | } | |
226 | ||
227 | return value_cast (type, arg); | |
228 | } | |
229 | ||
07be84bf JK |
230 | /* Return the return type of a function with its first instruction exactly at |
231 | the PC address. Return NULL otherwise. */ | |
232 | ||
233 | static struct type * | |
234 | find_function_return_type (CORE_ADDR pc) | |
235 | { | |
236 | struct symbol *sym = find_pc_function (pc); | |
237 | ||
238 | if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc | |
239 | && SYMBOL_TYPE (sym) != NULL) | |
240 | return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)); | |
241 | ||
242 | return NULL; | |
243 | } | |
244 | ||
04714b91 AC |
245 | /* Determine a function's address and its return type from its value. |
246 | Calls error() if the function is not valid for calling. */ | |
247 | ||
a9fa03de | 248 | CORE_ADDR |
04714b91 AC |
249 | find_function_addr (struct value *function, struct type **retval_type) |
250 | { | |
df407dfe | 251 | struct type *ftype = check_typedef (value_type (function)); |
50810684 | 252 | struct gdbarch *gdbarch = get_type_arch (ftype); |
7788af6d | 253 | struct type *value_type = NULL; |
09b58708 JK |
254 | /* Initialize it just to avoid a GCC false warning. */ |
255 | CORE_ADDR funaddr = 0; | |
04714b91 AC |
256 | |
257 | /* If it's a member function, just look at the function | |
258 | part of it. */ | |
259 | ||
260 | /* Determine address to call. */ | |
300f8e10 JK |
261 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
262 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
263 | funaddr = value_address (function); | |
264 | else if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
04714b91 AC |
265 | { |
266 | funaddr = value_as_address (function); | |
267 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
268 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
269 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
300f8e10 JK |
270 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
271 | ¤t_target); | |
04714b91 | 272 | } |
300f8e10 JK |
273 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
274 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
07be84bf JK |
275 | { |
276 | value_type = TYPE_TARGET_TYPE (ftype); | |
277 | ||
278 | if (TYPE_GNU_IFUNC (ftype)) | |
279 | { | |
280 | funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr); | |
281 | ||
282 | /* Skip querying the function symbol if no RETVAL_TYPE has been | |
283 | asked for. */ | |
284 | if (retval_type) | |
285 | value_type = find_function_return_type (funaddr); | |
286 | } | |
287 | } | |
300f8e10 | 288 | else if (TYPE_CODE (ftype) == TYPE_CODE_INT) |
04714b91 AC |
289 | { |
290 | /* Handle the case of functions lacking debugging info. | |
1777feb0 | 291 | Their values are characters since their addresses are char. */ |
04714b91 AC |
292 | if (TYPE_LENGTH (ftype) == 1) |
293 | funaddr = value_as_address (value_addr (function)); | |
294 | else | |
2bbe3cc1 DJ |
295 | { |
296 | /* Handle function descriptors lacking debug info. */ | |
297 | int found_descriptor = 0; | |
abbb1732 | 298 | |
87bc73ea | 299 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
300 | if (VALUE_LVAL (function) == lval_memory) |
301 | { | |
302 | CORE_ADDR nfunaddr; | |
abbb1732 | 303 | |
2bbe3cc1 DJ |
304 | funaddr = value_as_address (value_addr (function)); |
305 | nfunaddr = funaddr; | |
50810684 | 306 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
2bbe3cc1 DJ |
307 | ¤t_target); |
308 | if (funaddr != nfunaddr) | |
309 | found_descriptor = 1; | |
310 | } | |
311 | if (!found_descriptor) | |
312 | /* Handle integer used as address of a function. */ | |
313 | funaddr = (CORE_ADDR) value_as_long (function); | |
314 | } | |
04714b91 AC |
315 | } |
316 | else | |
8a3fe4f8 | 317 | error (_("Invalid data type for function to be called.")); |
04714b91 | 318 | |
7d9b040b RC |
319 | if (retval_type != NULL) |
320 | *retval_type = value_type; | |
50810684 | 321 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
04714b91 AC |
322 | } |
323 | ||
d3712828 AC |
324 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
325 | function returns to. */ | |
7043d8dc AC |
326 | |
327 | static CORE_ADDR | |
328 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 329 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
330 | struct value **args, int nargs, |
331 | struct type *value_type, | |
e4fd649a UW |
332 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
333 | struct regcache *regcache) | |
7043d8dc | 334 | { |
50a834af MK |
335 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
336 | ||
337 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
338 | args, nargs, value_type, real_pc, bp_addr, | |
339 | regcache); | |
7043d8dc AC |
340 | } |
341 | ||
b89667eb DE |
342 | /* Fetch the name of the function at FUNADDR. |
343 | This is used in printing an error message for call_function_by_hand. | |
344 | BUF is used to print FUNADDR in hex if the function name cannot be | |
345 | determined. It must be large enough to hold formatted result of | |
346 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
347 | ||
348 | static const char * | |
349 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
350 | { | |
351 | { | |
352 | struct symbol *symbol = find_pc_function (funaddr); | |
abbb1732 | 353 | |
b89667eb DE |
354 | if (symbol) |
355 | return SYMBOL_PRINT_NAME (symbol); | |
356 | } | |
357 | ||
358 | { | |
359 | /* Try the minimal symbols. */ | |
7cbd4a93 | 360 | struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr); |
abbb1732 | 361 | |
7cbd4a93 | 362 | if (msymbol.minsym) |
efd66ac6 | 363 | return MSYMBOL_PRINT_NAME (msymbol.minsym); |
b89667eb DE |
364 | } |
365 | ||
366 | { | |
367 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
368 | hex_string (funaddr)); | |
abbb1732 | 369 | |
b89667eb DE |
370 | gdb_assert (strlen (tmp) + 1 <= buf_size); |
371 | strcpy (buf, tmp); | |
372 | xfree (tmp); | |
373 | return buf; | |
374 | } | |
375 | } | |
376 | ||
377 | /* Subroutine of call_function_by_hand to simplify it. | |
378 | Start up the inferior and wait for it to stop. | |
379 | Return the exception if there's an error, or an exception with | |
380 | reason >= 0 if there's no error. | |
381 | ||
382 | This is done inside a TRY_CATCH so the caller needn't worry about | |
383 | thrown errors. The caller should rethrow if there's an error. */ | |
384 | ||
385 | static struct gdb_exception | |
386 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
387 | { | |
388 | volatile struct gdb_exception e; | |
16c381f0 | 389 | int saved_in_infcall = call_thread->control.in_infcall; |
b89667eb | 390 | ptid_t call_thread_ptid = call_thread->ptid; |
b89667eb | 391 | |
16c381f0 | 392 | call_thread->control.in_infcall = 1; |
c5a4d20b | 393 | |
b89667eb DE |
394 | clear_proceed_status (); |
395 | ||
396 | disable_watchpoints_before_interactive_call_start (); | |
16c381f0 | 397 | |
1777feb0 | 398 | /* We want stop_registers, please... */ |
16c381f0 | 399 | call_thread->control.proceed_to_finish = 1; |
b89667eb | 400 | |
b89667eb | 401 | TRY_CATCH (e, RETURN_MASK_ALL) |
3dd5b83d | 402 | { |
beb460e8 PA |
403 | int was_sync = sync_execution; |
404 | ||
a493e3e2 | 405 | proceed (real_pc, GDB_SIGNAL_0, 0); |
3dd5b83d PA |
406 | |
407 | /* Inferior function calls are always synchronous, even if the | |
408 | target supports asynchronous execution. Do here what | |
409 | `proceed' itself does in sync mode. */ | |
4ae57c05 | 410 | if (target_can_async_p ()) |
3dd5b83d PA |
411 | { |
412 | wait_for_inferior (); | |
413 | normal_stop (); | |
beb460e8 PA |
414 | /* If GDB was previously in sync execution mode, then ensure |
415 | that it remains so. normal_stop calls | |
416 | async_enable_stdin, so reset it again here. In other | |
417 | cases, stdin will be re-enabled by | |
418 | inferior_event_handler, when an exception is thrown. */ | |
419 | if (was_sync) | |
420 | async_disable_stdin (); | |
3dd5b83d PA |
421 | } |
422 | } | |
b89667eb | 423 | |
c5a4d20b PA |
424 | /* At this point the current thread may have changed. Refresh |
425 | CALL_THREAD as it could be invalid if its thread has exited. */ | |
e09875d4 | 426 | call_thread = find_thread_ptid (call_thread_ptid); |
b89667eb | 427 | |
b89667eb DE |
428 | enable_watchpoints_after_interactive_call_stop (); |
429 | ||
430 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
431 | of inferior call thread. | |
432 | If all error()s out of proceed ended up calling normal_stop | |
433 | (and perhaps they should; it already does in the special case | |
434 | of error out of resume()), then we wouldn't need this. */ | |
435 | if (e.reason < 0) | |
436 | { | |
c5a4d20b | 437 | if (call_thread != NULL) |
16c381f0 | 438 | breakpoint_auto_delete (call_thread->control.stop_bpstat); |
b89667eb DE |
439 | } |
440 | ||
c5a4d20b | 441 | if (call_thread != NULL) |
16c381f0 | 442 | call_thread->control.in_infcall = saved_in_infcall; |
c5a4d20b | 443 | |
b89667eb DE |
444 | return e; |
445 | } | |
446 | ||
aa7d318d TT |
447 | /* A cleanup function that calls delete_std_terminate_breakpoint. */ |
448 | static void | |
449 | cleanup_delete_std_terminate_breakpoint (void *ignore) | |
450 | { | |
451 | delete_std_terminate_breakpoint (); | |
452 | } | |
453 | ||
04714b91 AC |
454 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
455 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
456 | frame which looks just like a real frame is so that if you call a | |
457 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
458 | will look right. Whether the backtrace needs to actually show the | |
459 | stack at the time the inferior function was called is debatable, but | |
460 | it certainly needs to not display garbage. So if you are contemplating | |
461 | making dummy frames be different from normal frames, consider that. */ | |
462 | ||
463 | /* Perform a function call in the inferior. | |
464 | ARGS is a vector of values of arguments (NARGS of them). | |
465 | FUNCTION is a value, the function to be called. | |
466 | Returns a value representing what the function returned. | |
467 | May fail to return, if a breakpoint or signal is hit | |
468 | during the execution of the function. | |
469 | ||
1777feb0 | 470 | ARGS is modified to contain coerced values. */ |
04714b91 AC |
471 | |
472 | struct value * | |
473 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
474 | { | |
52f0bd74 | 475 | CORE_ADDR sp; |
41f1b697 | 476 | struct type *values_type, *target_values_type; |
18648a37 | 477 | unsigned char struct_return = 0, hidden_first_param_p = 0; |
04714b91 | 478 | CORE_ADDR struct_addr = 0; |
16c381f0 | 479 | struct infcall_control_state *inf_status; |
04714b91 | 480 | struct cleanup *inf_status_cleanup; |
16c381f0 | 481 | struct infcall_suspend_state *caller_state; |
04714b91 | 482 | CORE_ADDR funaddr; |
04714b91 | 483 | CORE_ADDR real_pc; |
df407dfe | 484 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 485 | CORE_ADDR bp_addr; |
96860204 | 486 | struct frame_id dummy_id; |
41f1b697 | 487 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
488 | struct frame_info *frame; |
489 | struct gdbarch *gdbarch; | |
aa7d318d | 490 | struct cleanup *terminate_bp_cleanup; |
b89667eb DE |
491 | ptid_t call_thread_ptid; |
492 | struct gdb_exception e; | |
b89667eb | 493 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; |
04714b91 | 494 | |
4c850810 DJ |
495 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
496 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
497 | ||
04714b91 AC |
498 | if (!target_has_execution) |
499 | noprocess (); | |
500 | ||
573cda03 SS |
501 | if (get_traceframe_number () >= 0) |
502 | error (_("May not call functions while looking at trace frames.")); | |
503 | ||
949dc678 | 504 | if (execution_direction == EXEC_REVERSE) |
c2949be0 | 505 | error (_("Cannot call functions in reverse mode.")); |
949dc678 | 506 | |
0b9dfe2b MD |
507 | frame = get_current_frame (); |
508 | gdbarch = get_frame_arch (frame); | |
509 | ||
510 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 511 | error (_("This target does not support function calls.")); |
a86c5fc9 | 512 | |
b89667eb DE |
513 | /* A cleanup for the inferior status. |
514 | This is only needed while we're preparing the inferior function call. */ | |
16c381f0 JK |
515 | inf_status = save_infcall_control_state (); |
516 | inf_status_cleanup | |
517 | = make_cleanup_restore_infcall_control_state (inf_status); | |
04714b91 | 518 | |
b89667eb DE |
519 | /* Save the caller's registers and other state associated with the |
520 | inferior itself so that they can be restored once the | |
96860204 AC |
521 | callee returns. To allow nested calls the registers are (further |
522 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
523 | is tossed once the regcache has been pushed). */ | |
16c381f0 JK |
524 | caller_state = save_infcall_suspend_state (); |
525 | make_cleanup_restore_infcall_suspend_state (caller_state); | |
04714b91 | 526 | |
04714b91 | 527 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 528 | { |
0b9dfe2b | 529 | CORE_ADDR old_sp = get_frame_sp (frame); |
abbb1732 | 530 | |
0b9dfe2b | 531 | if (gdbarch_frame_align_p (gdbarch)) |
ebc7896c | 532 | { |
0b9dfe2b | 533 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
534 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
535 | ABIs, a function can use memory beyond the inner most stack | |
536 | address. AMD64 called that region the "red zone". Skip at | |
537 | least the "red zone" size before allocating any space on | |
538 | the stack. */ | |
0b9dfe2b MD |
539 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
540 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 541 | else |
0b9dfe2b | 542 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 543 | /* Still aligned? */ |
0b9dfe2b | 544 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
545 | /* NOTE: cagney/2002-09-18: |
546 | ||
547 | On a RISC architecture, a void parameterless generic dummy | |
548 | frame (i.e., no parameters, no result) typically does not | |
549 | need to push anything the stack and hence can leave SP and | |
c48a845b | 550 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
551 | not push anything on the stack and, hence, that too can |
552 | leave FP and SP unchanged. As a consequence, a sequence of | |
553 | void parameterless generic dummy frame calls to frameless | |
554 | functions will create a sequence of effectively identical | |
555 | frames (SP, FP and TOS and PC the same). This, not | |
556 | suprisingly, results in what appears to be a stack in an | |
557 | infinite loop --- when GDB tries to find a generic dummy | |
558 | frame on the internal dummy frame stack, it will always | |
559 | find the first one. | |
560 | ||
561 | To avoid this problem, the code below always grows the | |
562 | stack. That way, two dummy frames can never be identical. | |
563 | It does burn a few bytes of stack but that is a small price | |
564 | to pay :-). */ | |
ebc7896c AC |
565 | if (sp == old_sp) |
566 | { | |
0b9dfe2b | 567 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 568 | /* Stack grows down. */ |
0b9dfe2b | 569 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
570 | else |
571 | /* Stack grows up. */ | |
0b9dfe2b | 572 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 573 | } |
0e095b7e JK |
574 | /* SP may have underflown address zero here from OLD_SP. Memory access |
575 | functions will probably fail in such case but that is a target's | |
576 | problem. */ | |
ebc7896c AC |
577 | } |
578 | else | |
a59fe496 AC |
579 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
580 | ||
8b148df9 AC |
581 | Who knows how badly aligned the SP is! |
582 | ||
583 | If the generic dummy frame ends up empty (because nothing is | |
584 | pushed) GDB won't be able to correctly perform back traces. | |
585 | If a target is having trouble with backtraces, first thing to | |
1777feb0 | 586 | do is add FRAME_ALIGN() to the architecture vector. If that |
669fac23 | 587 | fails, try dummy_id(). |
8b148df9 AC |
588 | |
589 | If the ABI specifies a "Red Zone" (see the doco) the code | |
590 | below will quietly trash it. */ | |
ebc7896c AC |
591 | sp = old_sp; |
592 | } | |
04714b91 | 593 | |
df407dfe | 594 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
595 | if (!values_type) |
596 | values_type = builtin_type (gdbarch)->builtin_int; | |
597 | ||
df407dfe | 598 | CHECK_TYPEDEF (values_type); |
04714b91 | 599 | |
41f1b697 DJ |
600 | /* Are we returning a value using a structure return (passing a |
601 | hidden argument pointing to storage) or a normal value return? | |
602 | There are two cases: language-mandated structure return and | |
603 | target ABI structure return. The variable STRUCT_RETURN only | |
604 | describes the latter. The language version is handled by passing | |
605 | the return location as the first parameter to the function, | |
606 | even preceding "this". This is different from the target | |
607 | ABI version, which is target-specific; for instance, on ia64 | |
608 | the first argument is passed in out0 but the hidden structure | |
609 | return pointer would normally be passed in r8. */ | |
610 | ||
18648a37 | 611 | if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type)) |
41f1b697 | 612 | { |
18648a37 | 613 | hidden_first_param_p = 1; |
04714b91 | 614 | |
41f1b697 DJ |
615 | /* Tell the target specific argument pushing routine not to |
616 | expect a value. */ | |
48319d1f | 617 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
618 | } |
619 | else | |
620 | { | |
6a3a010b | 621 | struct_return = using_struct_return (gdbarch, function, values_type); |
41f1b697 DJ |
622 | target_values_type = values_type; |
623 | } | |
04714b91 | 624 | |
7043d8dc AC |
625 | /* Determine the location of the breakpoint (and possibly other |
626 | stuff) that the called function will return to. The SPARC, for a | |
627 | function returning a structure or union, needs to make space for | |
628 | not just the breakpoint but also an extra word containing the | |
629 | size (?) of the structure being passed. */ | |
630 | ||
0b9dfe2b | 631 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
632 | { |
633 | case ON_STACK: | |
a14dd77e JK |
634 | { |
635 | const gdb_byte *bp_bytes; | |
636 | CORE_ADDR bp_addr_as_address; | |
637 | int bp_size; | |
638 | ||
639 | /* Be careful BP_ADDR is in inferior PC encoding while | |
640 | BP_ADDR_AS_ADDRESS is a plain memory address. */ | |
641 | ||
642 | sp = push_dummy_code (gdbarch, sp, funaddr, args, nargs, | |
643 | target_values_type, &real_pc, &bp_addr, | |
644 | get_current_regcache ()); | |
645 | ||
646 | /* Write a legitimate instruction at the point where the infcall | |
647 | breakpoint is going to be inserted. While this instruction | |
648 | is never going to be executed, a user investigating the | |
649 | memory from GDB would see this instruction instead of random | |
650 | uninitialized bytes. We chose the breakpoint instruction | |
651 | as it may look as the most logical one to the user and also | |
652 | valgrind 3.7.0 needs it for proper vgdb inferior calls. | |
653 | ||
654 | If software breakpoints are unsupported for this target we | |
655 | leave the user visible memory content uninitialized. */ | |
656 | ||
657 | bp_addr_as_address = bp_addr; | |
658 | bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address, | |
659 | &bp_size); | |
660 | if (bp_bytes != NULL) | |
661 | write_memory (bp_addr_as_address, bp_bytes, bp_size); | |
662 | } | |
7043d8dc | 663 | break; |
5931a2fa JK |
664 | case AT_ENTRY_POINT: |
665 | { | |
666 | CORE_ADDR dummy_addr; | |
667 | ||
668 | real_pc = funaddr; | |
669 | dummy_addr = entry_point_address (); | |
a14dd77e | 670 | |
5931a2fa | 671 | /* A call dummy always consists of just a single breakpoint, so |
a14dd77e JK |
672 | its address is the same as the address of the dummy. |
673 | ||
674 | The actual breakpoint is inserted separatly so there is no need to | |
675 | write that out. */ | |
5931a2fa JK |
676 | bp_addr = dummy_addr; |
677 | break; | |
678 | } | |
04714b91 | 679 | default: |
e2e0b3e5 | 680 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
681 | } |
682 | ||
04714b91 | 683 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 684 | error (_("Too few arguments in function call.")); |
04714b91 | 685 | |
ebc7896c AC |
686 | { |
687 | int i; | |
abbb1732 | 688 | |
ebc7896c AC |
689 | for (i = nargs - 1; i >= 0; i--) |
690 | { | |
691 | int prototyped; | |
692 | struct type *param_type; | |
693 | ||
694 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
695 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
696 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
697 | prototyped = 1; | |
698 | else if (i < TYPE_NFIELDS (ftype)) | |
699 | prototyped = TYPE_PROTOTYPED (ftype); | |
700 | else | |
701 | prototyped = 0; | |
702 | ||
703 | if (i < TYPE_NFIELDS (ftype)) | |
704 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
705 | else | |
706 | param_type = NULL; | |
41f1b697 | 707 | |
7788af6d UW |
708 | args[i] = value_arg_coerce (gdbarch, args[i], |
709 | param_type, prototyped, &sp); | |
ebc7896c | 710 | |
41f1b697 DJ |
711 | if (param_type != NULL && language_pass_by_reference (param_type)) |
712 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
713 | } |
714 | } | |
04714b91 | 715 | |
04714b91 AC |
716 | /* Reserve space for the return structure to be written on the |
717 | stack, if necessary. Make certain that the value is correctly | |
1777feb0 | 718 | aligned. */ |
04714b91 | 719 | |
18648a37 | 720 | if (struct_return || hidden_first_param_p) |
04714b91 | 721 | { |
0b9dfe2b | 722 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
723 | { |
724 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
725 | making space for the return value. */ | |
744a8059 | 726 | sp -= TYPE_LENGTH (values_type); |
0b9dfe2b MD |
727 | if (gdbarch_frame_align_p (gdbarch)) |
728 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
729 | struct_addr = sp; |
730 | } | |
731 | else | |
732 | { | |
733 | /* Stack grows upward. Align the frame, allocate space, and | |
1777feb0 | 734 | then again, re-align the frame??? */ |
0b9dfe2b MD |
735 | if (gdbarch_frame_align_p (gdbarch)) |
736 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 | 737 | struct_addr = sp; |
744a8059 | 738 | sp += TYPE_LENGTH (values_type); |
0b9dfe2b MD |
739 | if (gdbarch_frame_align_p (gdbarch)) |
740 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
741 | } |
742 | } | |
743 | ||
18648a37 | 744 | if (hidden_first_param_p) |
41f1b697 DJ |
745 | { |
746 | struct value **new_args; | |
747 | ||
748 | /* Add the new argument to the front of the argument list. */ | |
749 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
750 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
751 | struct_addr); | |
752 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
753 | args = new_args; | |
754 | nargs++; | |
755 | args_cleanup = make_cleanup (xfree, args); | |
756 | } | |
757 | else | |
758 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
759 | ||
04714b91 AC |
760 | /* Create the dummy stack frame. Pass in the call dummy address as, |
761 | presumably, the ABI code knows where, in the call dummy, the | |
762 | return address should be pointed. */ | |
0b9dfe2b MD |
763 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
764 | bp_addr, nargs, args, | |
594f7785 | 765 | sp, struct_return, struct_addr); |
04714b91 | 766 | |
41f1b697 DJ |
767 | do_cleanups (args_cleanup); |
768 | ||
96860204 AC |
769 | /* Set up a frame ID for the dummy frame so we can pass it to |
770 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
771 | ID so that the breakpoint code can correctly re-identify the | |
772 | dummy breakpoint. */ | |
8241eaa6 | 773 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 774 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 775 | the frame ID's stack address. */ |
96860204 | 776 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 777 | |
74cfe982 AC |
778 | /* Create a momentary breakpoint at the return address of the |
779 | inferior. That way it breaks when it returns. */ | |
04714b91 | 780 | |
74cfe982 | 781 | { |
e2e4d78b | 782 | struct breakpoint *bpt, *longjmp_b; |
74cfe982 | 783 | struct symtab_and_line sal; |
abbb1732 | 784 | |
74cfe982 | 785 | init_sal (&sal); /* initialize to zeroes */ |
6c95b8df | 786 | sal.pspace = current_program_space; |
74cfe982 AC |
787 | sal.pc = bp_addr; |
788 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
789 | /* Sanity. The exact same SP value is returned by |
790 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 791 | dummy_id to form the frame ID's stack address. */ |
a6d9a66e | 792 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
c70a6932 JK |
793 | |
794 | /* set_momentary_breakpoint invalidates FRAME. */ | |
795 | frame = NULL; | |
796 | ||
74cfe982 | 797 | bpt->disposition = disp_del; |
e2e4d78b JK |
798 | gdb_assert (bpt->related_breakpoint == bpt); |
799 | ||
800 | longjmp_b = set_longjmp_breakpoint_for_call_dummy (); | |
801 | if (longjmp_b) | |
802 | { | |
803 | /* Link BPT into the chain of LONGJMP_B. */ | |
804 | bpt->related_breakpoint = longjmp_b; | |
805 | while (longjmp_b->related_breakpoint != bpt->related_breakpoint) | |
806 | longjmp_b = longjmp_b->related_breakpoint; | |
807 | longjmp_b->related_breakpoint = bpt; | |
808 | } | |
74cfe982 | 809 | } |
04714b91 | 810 | |
7cd1089b PM |
811 | /* Create a breakpoint in std::terminate. |
812 | If a C++ exception is raised in the dummy-frame, and the | |
813 | exception handler is (normally, and expected to be) out-of-frame, | |
814 | the default C++ handler will (wrongly) be called in an inferior | |
815 | function call. This is wrong, as an exception can be normally | |
816 | and legally handled out-of-frame. The confines of the dummy frame | |
817 | prevent the unwinder from finding the correct handler (or any | |
818 | handler, unless it is in-frame). The default handler calls | |
819 | std::terminate. This will kill the inferior. Assert that | |
820 | terminate should never be called in an inferior function | |
821 | call. Place a momentary breakpoint in the std::terminate function | |
822 | and if triggered in the call, rewind. */ | |
823 | if (unwind_on_terminating_exception_p) | |
aa7d318d | 824 | set_std_terminate_breakpoint (); |
7cd1089b | 825 | |
96860204 AC |
826 | /* Everything's ready, push all the info needed to restore the |
827 | caller (and identify the dummy-frame) onto the dummy-frame | |
828 | stack. */ | |
b89667eb DE |
829 | dummy_frame_push (caller_state, &dummy_id); |
830 | ||
831 | /* Discard both inf_status and caller_state cleanups. | |
832 | From this point on we explicitly restore the associated state | |
833 | or discard it. */ | |
834 | discard_cleanups (inf_status_cleanup); | |
96860204 | 835 | |
7cd1089b | 836 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
aa7d318d TT |
837 | terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, |
838 | NULL); | |
7cd1089b | 839 | |
96860204 AC |
840 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
841 | If you're looking to implement asynchronous dummy-frames, then | |
842 | just below is the place to chop this function in two.. */ | |
843 | ||
b89667eb DE |
844 | /* TP is invalid after run_inferior_call returns, so enclose this |
845 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 846 | { |
32400beb | 847 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 848 | |
b89667eb DE |
849 | /* Save this thread's ptid, we need it later but the thread |
850 | may have exited. */ | |
851 | call_thread_ptid = tp->ptid; | |
74cfe982 | 852 | |
b89667eb | 853 | /* Run the inferior until it stops. */ |
f5871ec0 | 854 | |
b89667eb | 855 | e = run_inferior_call (tp, real_pc); |
52557533 | 856 | } |
04714b91 | 857 | |
b89667eb DE |
858 | /* Rethrow an error if we got one trying to run the inferior. */ |
859 | ||
860 | if (e.reason < 0) | |
861 | { | |
862 | const char *name = get_function_name (funaddr, | |
863 | name_buf, sizeof (name_buf)); | |
864 | ||
16c381f0 | 865 | discard_infcall_control_state (inf_status); |
b89667eb DE |
866 | |
867 | /* We could discard the dummy frame here if the program exited, | |
868 | but it will get garbage collected the next time the program is | |
869 | run anyway. */ | |
870 | ||
871 | switch (e.reason) | |
872 | { | |
873 | case RETURN_ERROR: | |
ac74f770 MS |
874 | throw_error (e.error, _("%s\n\ |
875 | An error occurred while in a function called from GDB.\n\ | |
876 | Evaluation of the expression containing the function\n\ | |
877 | (%s) will be abandoned.\n\ | |
878 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
879 | e.message, name); |
880 | case RETURN_QUIT: | |
881 | default: | |
882 | throw_exception (e); | |
883 | } | |
884 | } | |
885 | ||
886 | /* If the program has exited, or we stopped at a different thread, | |
887 | exit and inform the user. */ | |
888 | ||
de04a248 DE |
889 | if (! target_has_execution) |
890 | { | |
b89667eb DE |
891 | const char *name = get_function_name (funaddr, |
892 | name_buf, sizeof (name_buf)); | |
893 | ||
894 | /* If we try to restore the inferior status, | |
de04a248 | 895 | we'll crash as the inferior is no longer running. */ |
16c381f0 | 896 | discard_infcall_control_state (inf_status); |
b89667eb DE |
897 | |
898 | /* We could discard the dummy frame here given that the program exited, | |
899 | but it will get garbage collected the next time the program is | |
900 | run anyway. */ | |
901 | ||
3e43a32a MS |
902 | error (_("The program being debugged exited while in a function " |
903 | "called from GDB.\n" | |
904 | "Evaluation of the expression containing the function\n" | |
905 | "(%s) will be abandoned."), | |
b89667eb DE |
906 | name); |
907 | } | |
908 | ||
909 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
910 | { | |
911 | const char *name = get_function_name (funaddr, | |
912 | name_buf, sizeof (name_buf)); | |
913 | ||
914 | /* We've switched threads. This can happen if another thread gets a | |
915 | signal or breakpoint while our thread was running. | |
916 | There's no point in restoring the inferior status, | |
917 | we're in a different thread. */ | |
16c381f0 | 918 | discard_infcall_control_state (inf_status); |
b89667eb DE |
919 | /* Keep the dummy frame record, if the user switches back to the |
920 | thread with the hand-call, we'll need it. */ | |
921 | if (stopped_by_random_signal) | |
ac74f770 MS |
922 | error (_("\ |
923 | The program received a signal in another thread while\n\ | |
924 | making a function call from GDB.\n\ | |
925 | Evaluation of the expression containing the function\n\ | |
926 | (%s) will be abandoned.\n\ | |
927 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
928 | name); |
929 | else | |
ac74f770 MS |
930 | error (_("\ |
931 | The program stopped in another thread while making a function call from GDB.\n\ | |
932 | Evaluation of the expression containing the function\n\ | |
933 | (%s) will be abandoned.\n\ | |
934 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 935 | name); |
de04a248 DE |
936 | } |
937 | ||
aa7d318d | 938 | if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY) |
52557533 | 939 | { |
b89667eb DE |
940 | const char *name = get_function_name (funaddr, |
941 | name_buf, sizeof (name_buf)); | |
942 | ||
52557533 AC |
943 | if (stopped_by_random_signal) |
944 | { | |
945 | /* We stopped inside the FUNCTION because of a random | |
946 | signal. Further execution of the FUNCTION is not | |
1777feb0 | 947 | allowed. */ |
04714b91 | 948 | |
52557533 AC |
949 | if (unwind_on_signal_p) |
950 | { | |
1777feb0 | 951 | /* The user wants the context restored. */ |
52557533 AC |
952 | |
953 | /* We must get back to the frame we were before the | |
b89667eb DE |
954 | dummy call. */ |
955 | dummy_frame_pop (dummy_id); | |
956 | ||
957 | /* We also need to restore inferior status to that before the | |
958 | dummy call. */ | |
16c381f0 | 959 | restore_infcall_control_state (inf_status); |
04714b91 | 960 | |
52557533 AC |
961 | /* FIXME: Insert a bunch of wrap_here; name can be very |
962 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
963 | error (_("\ |
964 | The program being debugged was signaled while in a function called from GDB.\n\ | |
965 | GDB has restored the context to what it was before the call.\n\ | |
966 | To change this behavior use \"set unwindonsignal off\".\n\ | |
967 | Evaluation of the expression containing the function\n\ | |
968 | (%s) will be abandoned."), | |
52557533 AC |
969 | name); |
970 | } | |
971 | else | |
972 | { | |
973 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
974 | (default). |
975 | Discard inferior status, we're not at the same point | |
976 | we started at. */ | |
16c381f0 | 977 | discard_infcall_control_state (inf_status); |
b89667eb | 978 | |
52557533 AC |
979 | /* FIXME: Insert a bunch of wrap_here; name can be very |
980 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
981 | error (_("\ |
982 | The program being debugged was signaled while in a function called from GDB.\n\ | |
983 | GDB remains in the frame where the signal was received.\n\ | |
984 | To change this behavior use \"set unwindonsignal on\".\n\ | |
985 | Evaluation of the expression containing the function\n\ | |
986 | (%s) will be abandoned.\n\ | |
987 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
988 | name); |
989 | } | |
990 | } | |
04714b91 | 991 | |
aa7d318d | 992 | if (stop_stack_dummy == STOP_STD_TERMINATE) |
52557533 | 993 | { |
aa7d318d TT |
994 | /* We must get back to the frame we were before the dummy |
995 | call. */ | |
996 | dummy_frame_pop (dummy_id); | |
7cd1089b | 997 | |
aa7d318d TT |
998 | /* We also need to restore inferior status to that before |
999 | the dummy call. */ | |
16c381f0 | 1000 | restore_infcall_control_state (inf_status); |
aa7d318d | 1001 | |
ac74f770 MS |
1002 | error (_("\ |
1003 | The program being debugged entered a std::terminate call, most likely\n\ | |
1004 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
1005 | to prevent the program from being terminated, and has restored the\n\ | |
1006 | context to its original state before the call.\n\ | |
1007 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
1008 | Evaluation of the expression containing the function (%s)\n\ | |
1009 | will be abandoned."), | |
aa7d318d TT |
1010 | name); |
1011 | } | |
1012 | else if (stop_stack_dummy == STOP_NONE) | |
1013 | { | |
1014 | ||
b89667eb DE |
1015 | /* We hit a breakpoint inside the FUNCTION. |
1016 | Keep the dummy frame, the user may want to examine its state. | |
1017 | Discard inferior status, we're not at the same point | |
1018 | we started at. */ | |
16c381f0 | 1019 | discard_infcall_control_state (inf_status); |
b89667eb | 1020 | |
52557533 AC |
1021 | /* The following error message used to say "The expression |
1022 | which contained the function call has been discarded." | |
1023 | It is a hard concept to explain in a few words. Ideally, | |
1024 | GDB would be able to resume evaluation of the expression | |
1025 | when the function finally is done executing. Perhaps | |
1026 | someday this will be implemented (it would not be easy). */ | |
1027 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
1028 | a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1029 | error (_("\ |
1030 | The program being debugged stopped while in a function called from GDB.\n\ | |
1031 | Evaluation of the expression containing the function\n\ | |
1032 | (%s) will be abandoned.\n\ | |
1033 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 1034 | name); |
52557533 AC |
1035 | } |
1036 | ||
1037 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 1038 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 1039 | } |
04714b91 | 1040 | |
aa7d318d | 1041 | do_cleanups (terminate_bp_cleanup); |
2f2da8f6 | 1042 | |
b89667eb DE |
1043 | /* If we get here the called FUNCTION ran to completion, |
1044 | and the dummy frame has already been popped. */ | |
74cfe982 | 1045 | |
44e5158b | 1046 | { |
d37346f0 DJ |
1047 | struct address_space *aspace = get_regcache_aspace (stop_registers); |
1048 | struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); | |
b89667eb | 1049 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); |
1a4d7a36 MK |
1050 | struct value *retval = NULL; |
1051 | ||
b89667eb DE |
1052 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
1053 | ||
1054 | /* Inferior call is successful. Restore the inferior status. | |
1055 | At this stage, leave the RETBUF alone. */ | |
16c381f0 | 1056 | restore_infcall_control_state (inf_status); |
b89667eb DE |
1057 | |
1058 | /* Figure out the value returned by the function. */ | |
81b4675a | 1059 | retval = allocate_value (values_type); |
b89667eb | 1060 | |
18648a37 | 1061 | if (hidden_first_param_p) |
81b4675a UW |
1062 | read_value_memory (retval, 0, 1, struct_addr, |
1063 | value_contents_raw (retval), | |
1064 | TYPE_LENGTH (values_type)); | |
1065 | else if (TYPE_CODE (target_values_type) != TYPE_CODE_VOID) | |
44e5158b | 1066 | { |
1a4d7a36 MK |
1067 | /* If the function returns void, don't bother fetching the |
1068 | return value. */ | |
6a3a010b MR |
1069 | switch (gdbarch_return_value (gdbarch, function, target_values_type, |
1070 | NULL, NULL, NULL)) | |
1a4d7a36 MK |
1071 | { |
1072 | case RETURN_VALUE_REGISTER_CONVENTION: | |
1073 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: | |
1074 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: | |
6a3a010b | 1075 | gdbarch_return_value (gdbarch, function, values_type, |
c055b101 | 1076 | retbuf, value_contents_raw (retval), NULL); |
1a4d7a36 MK |
1077 | break; |
1078 | case RETURN_VALUE_STRUCT_CONVENTION: | |
81b4675a UW |
1079 | read_value_memory (retval, 0, 1, struct_addr, |
1080 | value_contents_raw (retval), | |
1081 | TYPE_LENGTH (values_type)); | |
1a4d7a36 MK |
1082 | break; |
1083 | } | |
1084 | } | |
1085 | ||
44e5158b | 1086 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 1087 | |
b89667eb | 1088 | gdb_assert (retval); |
44e5158b AC |
1089 | return retval; |
1090 | } | |
04714b91 | 1091 | } |
1a4d7a36 | 1092 | \f |
04714b91 | 1093 | |
1a4d7a36 | 1094 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
1095 | void _initialize_infcall (void); |
1096 | ||
1097 | void | |
1098 | _initialize_infcall (void) | |
1099 | { | |
1100 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1101 | &coerce_float_to_double_p, _("\ |
1102 | Set coercion of floats to doubles when calling functions."), _("\ | |
1103 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1104 | Variables of type float should generally be converted to doubles before\n\ |
1105 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1106 | function. However, some older debug info formats do not provide enough\n\ | |
1107 | information to determine that a function is prototyped. If this flag is\n\ | |
1108 | set, GDB will perform the conversion for a function it considers\n\ | |
1109 | unprototyped.\n\ | |
7915a72c | 1110 | The default is to perform the conversion.\n"), |
2c5b56ce | 1111 | NULL, |
920d2a44 | 1112 | show_coerce_float_to_double_p, |
2c5b56ce | 1113 | &setlist, &showlist); |
04714b91 AC |
1114 | |
1115 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1116 | &unwind_on_signal_p, _("\ |
1117 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1118 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1119 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1120 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1121 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1122 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1123 | NULL, |
920d2a44 | 1124 | show_unwind_on_signal_p, |
2c5b56ce | 1125 | &setlist, &showlist); |
7cd1089b PM |
1126 | |
1127 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1128 | &unwind_on_terminating_exception_p, _("\ | |
1129 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
3e43a32a MS |
1130 | Show unwinding of stack if std::terminate() is called while in a call dummy."), |
1131 | _("\ | |
7cd1089b PM |
1132 | The unwind on terminating exception flag lets the user determine\n\ |
1133 | what gdb should do if a std::terminate() call is made from the\n\ | |
1134 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1135 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1136 | std::terminate call to proceed.\n\ | |
1137 | The default is to unwind the frame."), | |
1138 | NULL, | |
1139 | show_unwind_on_terminating_exception_p, | |
1140 | &setlist, &showlist); | |
1141 | ||
04714b91 | 1142 | } |