Commit | Line | Data |
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04714b91 AC |
1 | /* Perform an inferior function call, for GDB, the GNU debugger. |
2 | ||
6aba47ca | 3 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
9b254dd1 | 4 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
7b6bb8da | 5 | 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
04714b91 AC |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
04714b91 AC |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
04714b91 AC |
21 | |
22 | #include "defs.h" | |
23 | #include "breakpoint.h" | |
573cda03 | 24 | #include "tracepoint.h" |
04714b91 AC |
25 | #include "target.h" |
26 | #include "regcache.h" | |
27 | #include "inferior.h" | |
28 | #include "gdb_assert.h" | |
29 | #include "block.h" | |
30 | #include "gdbcore.h" | |
31 | #include "language.h" | |
9ab9195f | 32 | #include "objfiles.h" |
04714b91 AC |
33 | #include "gdbcmd.h" |
34 | #include "command.h" | |
35 | #include "gdb_string.h" | |
b9362cc7 | 36 | #include "infcall.h" |
96860204 | 37 | #include "dummy-frame.h" |
a93c0eb6 | 38 | #include "ada-lang.h" |
347bddb7 | 39 | #include "gdbthread.h" |
b89667eb DE |
40 | #include "exceptions.h" |
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 AC |
92 | |
93 | 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) | |
164 | return value_cast_pointers (type, arg); | |
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: | |
218 | case TYPE_CODE_BITSTRING: | |
219 | case TYPE_CODE_ERROR: | |
0d5de010 DJ |
220 | case TYPE_CODE_MEMBERPTR: |
221 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
222 | case TYPE_CODE_METHOD: |
223 | case TYPE_CODE_COMPLEX: | |
224 | default: | |
225 | break; | |
226 | } | |
227 | ||
228 | return value_cast (type, arg); | |
229 | } | |
230 | ||
07be84bf JK |
231 | /* Return the return type of a function with its first instruction exactly at |
232 | the PC address. Return NULL otherwise. */ | |
233 | ||
234 | static struct type * | |
235 | find_function_return_type (CORE_ADDR pc) | |
236 | { | |
237 | struct symbol *sym = find_pc_function (pc); | |
238 | ||
239 | if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc | |
240 | && SYMBOL_TYPE (sym) != NULL) | |
241 | return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym)); | |
242 | ||
243 | return NULL; | |
244 | } | |
245 | ||
04714b91 AC |
246 | /* Determine a function's address and its return type from its value. |
247 | Calls error() if the function is not valid for calling. */ | |
248 | ||
a9fa03de | 249 | CORE_ADDR |
04714b91 AC |
250 | find_function_addr (struct value *function, struct type **retval_type) |
251 | { | |
df407dfe | 252 | struct type *ftype = check_typedef (value_type (function)); |
50810684 | 253 | struct gdbarch *gdbarch = get_type_arch (ftype); |
7788af6d | 254 | struct type *value_type = NULL; |
09b58708 JK |
255 | /* Initialize it just to avoid a GCC false warning. */ |
256 | CORE_ADDR funaddr = 0; | |
04714b91 AC |
257 | |
258 | /* If it's a member function, just look at the function | |
259 | part of it. */ | |
260 | ||
261 | /* Determine address to call. */ | |
300f8e10 JK |
262 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
263 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
264 | funaddr = value_address (function); | |
265 | else if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
04714b91 AC |
266 | { |
267 | funaddr = value_as_address (function); | |
268 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
269 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
270 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
300f8e10 JK |
271 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
272 | ¤t_target); | |
04714b91 | 273 | } |
300f8e10 JK |
274 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
275 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
07be84bf JK |
276 | { |
277 | value_type = TYPE_TARGET_TYPE (ftype); | |
278 | ||
279 | if (TYPE_GNU_IFUNC (ftype)) | |
280 | { | |
281 | funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr); | |
282 | ||
283 | /* Skip querying the function symbol if no RETVAL_TYPE has been | |
284 | asked for. */ | |
285 | if (retval_type) | |
286 | value_type = find_function_return_type (funaddr); | |
287 | } | |
288 | } | |
300f8e10 | 289 | else if (TYPE_CODE (ftype) == TYPE_CODE_INT) |
04714b91 AC |
290 | { |
291 | /* Handle the case of functions lacking debugging info. | |
1777feb0 | 292 | Their values are characters since their addresses are char. */ |
04714b91 AC |
293 | if (TYPE_LENGTH (ftype) == 1) |
294 | funaddr = value_as_address (value_addr (function)); | |
295 | else | |
2bbe3cc1 DJ |
296 | { |
297 | /* Handle function descriptors lacking debug info. */ | |
298 | int found_descriptor = 0; | |
abbb1732 | 299 | |
87bc73ea | 300 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
301 | if (VALUE_LVAL (function) == lval_memory) |
302 | { | |
303 | CORE_ADDR nfunaddr; | |
abbb1732 | 304 | |
2bbe3cc1 DJ |
305 | funaddr = value_as_address (value_addr (function)); |
306 | nfunaddr = funaddr; | |
50810684 | 307 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
2bbe3cc1 DJ |
308 | ¤t_target); |
309 | if (funaddr != nfunaddr) | |
310 | found_descriptor = 1; | |
311 | } | |
312 | if (!found_descriptor) | |
313 | /* Handle integer used as address of a function. */ | |
314 | funaddr = (CORE_ADDR) value_as_long (function); | |
315 | } | |
04714b91 AC |
316 | } |
317 | else | |
8a3fe4f8 | 318 | error (_("Invalid data type for function to be called.")); |
04714b91 | 319 | |
7d9b040b RC |
320 | if (retval_type != NULL) |
321 | *retval_type = value_type; | |
50810684 | 322 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
04714b91 AC |
323 | } |
324 | ||
d3712828 AC |
325 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
326 | function returns to. */ | |
7043d8dc AC |
327 | |
328 | static CORE_ADDR | |
329 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 330 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
331 | struct value **args, int nargs, |
332 | struct type *value_type, | |
e4fd649a UW |
333 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
334 | struct regcache *regcache) | |
7043d8dc | 335 | { |
50a834af MK |
336 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
337 | ||
338 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
339 | args, nargs, value_type, real_pc, bp_addr, | |
340 | regcache); | |
7043d8dc AC |
341 | } |
342 | ||
b89667eb DE |
343 | /* Fetch the name of the function at FUNADDR. |
344 | This is used in printing an error message for call_function_by_hand. | |
345 | BUF is used to print FUNADDR in hex if the function name cannot be | |
346 | determined. It must be large enough to hold formatted result of | |
347 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
348 | ||
349 | static const char * | |
350 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
351 | { | |
352 | { | |
353 | struct symbol *symbol = find_pc_function (funaddr); | |
abbb1732 | 354 | |
b89667eb DE |
355 | if (symbol) |
356 | return SYMBOL_PRINT_NAME (symbol); | |
357 | } | |
358 | ||
359 | { | |
360 | /* Try the minimal symbols. */ | |
361 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); | |
abbb1732 | 362 | |
b89667eb DE |
363 | if (msymbol) |
364 | return SYMBOL_PRINT_NAME (msymbol); | |
365 | } | |
366 | ||
367 | { | |
368 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
369 | hex_string (funaddr)); | |
abbb1732 | 370 | |
b89667eb DE |
371 | gdb_assert (strlen (tmp) + 1 <= buf_size); |
372 | strcpy (buf, tmp); | |
373 | xfree (tmp); | |
374 | return buf; | |
375 | } | |
376 | } | |
377 | ||
378 | /* Subroutine of call_function_by_hand to simplify it. | |
379 | Start up the inferior and wait for it to stop. | |
380 | Return the exception if there's an error, or an exception with | |
381 | reason >= 0 if there's no error. | |
382 | ||
383 | This is done inside a TRY_CATCH so the caller needn't worry about | |
384 | thrown errors. The caller should rethrow if there's an error. */ | |
385 | ||
386 | static struct gdb_exception | |
387 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
388 | { | |
389 | volatile struct gdb_exception e; | |
390 | int saved_async = 0; | |
16c381f0 | 391 | int saved_in_infcall = call_thread->control.in_infcall; |
b89667eb DE |
392 | ptid_t call_thread_ptid = call_thread->ptid; |
393 | char *saved_target_shortname = xstrdup (target_shortname); | |
394 | ||
16c381f0 | 395 | call_thread->control.in_infcall = 1; |
c5a4d20b | 396 | |
b89667eb DE |
397 | clear_proceed_status (); |
398 | ||
399 | disable_watchpoints_before_interactive_call_start (); | |
16c381f0 | 400 | |
1777feb0 | 401 | /* We want stop_registers, please... */ |
16c381f0 | 402 | call_thread->control.proceed_to_finish = 1; |
b89667eb DE |
403 | |
404 | if (target_can_async_p ()) | |
405 | saved_async = target_async_mask (0); | |
406 | ||
b89667eb DE |
407 | TRY_CATCH (e, RETURN_MASK_ALL) |
408 | proceed (real_pc, TARGET_SIGNAL_0, 0); | |
409 | ||
c5a4d20b PA |
410 | /* At this point the current thread may have changed. Refresh |
411 | CALL_THREAD as it could be invalid if its thread has exited. */ | |
e09875d4 | 412 | call_thread = find_thread_ptid (call_thread_ptid); |
b89667eb DE |
413 | |
414 | /* Don't restore the async mask if the target has changed, | |
415 | saved_async is for the original target. */ | |
416 | if (saved_async | |
417 | && strcmp (saved_target_shortname, target_shortname) == 0) | |
418 | target_async_mask (saved_async); | |
419 | ||
420 | enable_watchpoints_after_interactive_call_stop (); | |
421 | ||
422 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
423 | of inferior call thread. | |
424 | If all error()s out of proceed ended up calling normal_stop | |
425 | (and perhaps they should; it already does in the special case | |
426 | of error out of resume()), then we wouldn't need this. */ | |
427 | if (e.reason < 0) | |
428 | { | |
c5a4d20b | 429 | if (call_thread != NULL) |
16c381f0 | 430 | breakpoint_auto_delete (call_thread->control.stop_bpstat); |
b89667eb DE |
431 | } |
432 | ||
c5a4d20b | 433 | if (call_thread != NULL) |
16c381f0 | 434 | call_thread->control.in_infcall = saved_in_infcall; |
c5a4d20b | 435 | |
b89667eb DE |
436 | xfree (saved_target_shortname); |
437 | ||
438 | return e; | |
439 | } | |
440 | ||
aa7d318d TT |
441 | /* A cleanup function that calls delete_std_terminate_breakpoint. */ |
442 | static void | |
443 | cleanup_delete_std_terminate_breakpoint (void *ignore) | |
444 | { | |
445 | delete_std_terminate_breakpoint (); | |
446 | } | |
447 | ||
04714b91 AC |
448 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
449 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
450 | frame which looks just like a real frame is so that if you call a | |
451 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
452 | will look right. Whether the backtrace needs to actually show the | |
453 | stack at the time the inferior function was called is debatable, but | |
454 | it certainly needs to not display garbage. So if you are contemplating | |
455 | making dummy frames be different from normal frames, consider that. */ | |
456 | ||
457 | /* Perform a function call in the inferior. | |
458 | ARGS is a vector of values of arguments (NARGS of them). | |
459 | FUNCTION is a value, the function to be called. | |
460 | Returns a value representing what the function returned. | |
461 | May fail to return, if a breakpoint or signal is hit | |
462 | during the execution of the function. | |
463 | ||
1777feb0 | 464 | ARGS is modified to contain coerced values. */ |
04714b91 AC |
465 | |
466 | struct value * | |
467 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
468 | { | |
52f0bd74 | 469 | CORE_ADDR sp; |
41f1b697 DJ |
470 | struct type *values_type, *target_values_type; |
471 | unsigned char struct_return = 0, lang_struct_return = 0; | |
04714b91 | 472 | CORE_ADDR struct_addr = 0; |
16c381f0 | 473 | struct infcall_control_state *inf_status; |
04714b91 | 474 | struct cleanup *inf_status_cleanup; |
16c381f0 | 475 | struct infcall_suspend_state *caller_state; |
04714b91 | 476 | CORE_ADDR funaddr; |
04714b91 | 477 | CORE_ADDR real_pc; |
df407dfe | 478 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 479 | CORE_ADDR bp_addr; |
96860204 | 480 | struct frame_id dummy_id; |
41f1b697 | 481 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
482 | struct frame_info *frame; |
483 | struct gdbarch *gdbarch; | |
aa7d318d | 484 | struct cleanup *terminate_bp_cleanup; |
b89667eb DE |
485 | ptid_t call_thread_ptid; |
486 | struct gdb_exception e; | |
b89667eb | 487 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; |
04714b91 | 488 | |
4c850810 DJ |
489 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
490 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
491 | ||
04714b91 AC |
492 | if (!target_has_execution) |
493 | noprocess (); | |
494 | ||
573cda03 SS |
495 | if (get_traceframe_number () >= 0) |
496 | error (_("May not call functions while looking at trace frames.")); | |
497 | ||
949dc678 PA |
498 | if (execution_direction == EXEC_REVERSE) |
499 | error (_("May not call functions in reverse.")); | |
500 | ||
0b9dfe2b MD |
501 | frame = get_current_frame (); |
502 | gdbarch = get_frame_arch (frame); | |
503 | ||
504 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 505 | error (_("This target does not support function calls.")); |
a86c5fc9 | 506 | |
b89667eb DE |
507 | /* A cleanup for the inferior status. |
508 | This is only needed while we're preparing the inferior function call. */ | |
16c381f0 JK |
509 | inf_status = save_infcall_control_state (); |
510 | inf_status_cleanup | |
511 | = make_cleanup_restore_infcall_control_state (inf_status); | |
04714b91 | 512 | |
b89667eb DE |
513 | /* Save the caller's registers and other state associated with the |
514 | inferior itself so that they can be restored once the | |
96860204 AC |
515 | callee returns. To allow nested calls the registers are (further |
516 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
517 | is tossed once the regcache has been pushed). */ | |
16c381f0 JK |
518 | caller_state = save_infcall_suspend_state (); |
519 | make_cleanup_restore_infcall_suspend_state (caller_state); | |
04714b91 | 520 | |
04714b91 | 521 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 522 | { |
0b9dfe2b | 523 | CORE_ADDR old_sp = get_frame_sp (frame); |
abbb1732 | 524 | |
0b9dfe2b | 525 | if (gdbarch_frame_align_p (gdbarch)) |
ebc7896c | 526 | { |
0b9dfe2b | 527 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
528 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
529 | ABIs, a function can use memory beyond the inner most stack | |
530 | address. AMD64 called that region the "red zone". Skip at | |
531 | least the "red zone" size before allocating any space on | |
532 | the stack. */ | |
0b9dfe2b MD |
533 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
534 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 535 | else |
0b9dfe2b | 536 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 537 | /* Still aligned? */ |
0b9dfe2b | 538 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
539 | /* NOTE: cagney/2002-09-18: |
540 | ||
541 | On a RISC architecture, a void parameterless generic dummy | |
542 | frame (i.e., no parameters, no result) typically does not | |
543 | need to push anything the stack and hence can leave SP and | |
c48a845b | 544 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
545 | not push anything on the stack and, hence, that too can |
546 | leave FP and SP unchanged. As a consequence, a sequence of | |
547 | void parameterless generic dummy frame calls to frameless | |
548 | functions will create a sequence of effectively identical | |
549 | frames (SP, FP and TOS and PC the same). This, not | |
550 | suprisingly, results in what appears to be a stack in an | |
551 | infinite loop --- when GDB tries to find a generic dummy | |
552 | frame on the internal dummy frame stack, it will always | |
553 | find the first one. | |
554 | ||
555 | To avoid this problem, the code below always grows the | |
556 | stack. That way, two dummy frames can never be identical. | |
557 | It does burn a few bytes of stack but that is a small price | |
558 | to pay :-). */ | |
ebc7896c AC |
559 | if (sp == old_sp) |
560 | { | |
0b9dfe2b | 561 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 562 | /* Stack grows down. */ |
0b9dfe2b | 563 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
564 | else |
565 | /* Stack grows up. */ | |
0b9dfe2b | 566 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 567 | } |
0e095b7e JK |
568 | /* SP may have underflown address zero here from OLD_SP. Memory access |
569 | functions will probably fail in such case but that is a target's | |
570 | problem. */ | |
ebc7896c AC |
571 | } |
572 | else | |
a59fe496 AC |
573 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
574 | ||
8b148df9 AC |
575 | Who knows how badly aligned the SP is! |
576 | ||
577 | If the generic dummy frame ends up empty (because nothing is | |
578 | pushed) GDB won't be able to correctly perform back traces. | |
579 | If a target is having trouble with backtraces, first thing to | |
1777feb0 | 580 | do is add FRAME_ALIGN() to the architecture vector. If that |
669fac23 | 581 | fails, try dummy_id(). |
8b148df9 AC |
582 | |
583 | If the ABI specifies a "Red Zone" (see the doco) the code | |
584 | below will quietly trash it. */ | |
ebc7896c AC |
585 | sp = old_sp; |
586 | } | |
04714b91 | 587 | |
df407dfe | 588 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
589 | if (!values_type) |
590 | values_type = builtin_type (gdbarch)->builtin_int; | |
591 | ||
df407dfe | 592 | CHECK_TYPEDEF (values_type); |
04714b91 | 593 | |
41f1b697 DJ |
594 | /* Are we returning a value using a structure return (passing a |
595 | hidden argument pointing to storage) or a normal value return? | |
596 | There are two cases: language-mandated structure return and | |
597 | target ABI structure return. The variable STRUCT_RETURN only | |
598 | describes the latter. The language version is handled by passing | |
599 | the return location as the first parameter to the function, | |
600 | even preceding "this". This is different from the target | |
601 | ABI version, which is target-specific; for instance, on ia64 | |
602 | the first argument is passed in out0 but the hidden structure | |
603 | return pointer would normally be passed in r8. */ | |
604 | ||
605 | if (language_pass_by_reference (values_type)) | |
606 | { | |
607 | lang_struct_return = 1; | |
04714b91 | 608 | |
41f1b697 DJ |
609 | /* Tell the target specific argument pushing routine not to |
610 | expect a value. */ | |
48319d1f | 611 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
612 | } |
613 | else | |
614 | { | |
d80b854b UW |
615 | struct_return = using_struct_return (gdbarch, |
616 | value_type (function), values_type); | |
41f1b697 DJ |
617 | target_values_type = values_type; |
618 | } | |
04714b91 | 619 | |
7043d8dc AC |
620 | /* Determine the location of the breakpoint (and possibly other |
621 | stuff) that the called function will return to. The SPARC, for a | |
622 | function returning a structure or union, needs to make space for | |
623 | not just the breakpoint but also an extra word containing the | |
624 | size (?) of the structure being passed. */ | |
625 | ||
626 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there | |
627 | is no need to write that out. */ | |
628 | ||
0b9dfe2b | 629 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
630 | { |
631 | case ON_STACK: | |
3b676233 | 632 | sp = push_dummy_code (gdbarch, sp, funaddr, |
82585c72 | 633 | args, nargs, target_values_type, |
594f7785 | 634 | &real_pc, &bp_addr, get_current_regcache ()); |
7043d8dc | 635 | break; |
04714b91 | 636 | case AT_ENTRY_POINT: |
3b676233 DE |
637 | { |
638 | CORE_ADDR dummy_addr; | |
639 | ||
640 | real_pc = funaddr; | |
641 | dummy_addr = entry_point_address (); | |
3b676233 DE |
642 | /* A call dummy always consists of just a single breakpoint, so |
643 | its address is the same as the address of the dummy. */ | |
644 | bp_addr = dummy_addr; | |
645 | break; | |
646 | } | |
9710e734 AC |
647 | case AT_SYMBOL: |
648 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose | |
649 | address is the location where the breakpoint should be | |
650 | placed. Once all targets are using the overhauled frame code | |
651 | this can be deleted - ON_STACK is a better option. */ | |
652 | { | |
653 | struct minimal_symbol *sym; | |
3b676233 | 654 | CORE_ADDR dummy_addr; |
9710e734 AC |
655 | |
656 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); | |
657 | real_pc = funaddr; | |
658 | if (sym) | |
3612b192 DJ |
659 | { |
660 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); | |
661 | /* Make certain that the address points at real code, and not | |
662 | a function descriptor. */ | |
663 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
664 | dummy_addr, | |
665 | ¤t_target); | |
666 | } | |
9710e734 AC |
667 | else |
668 | dummy_addr = entry_point_address (); | |
0285512f AC |
669 | /* A call dummy always consists of just a single breakpoint, |
670 | so it's address is the same as the address of the dummy. */ | |
9710e734 AC |
671 | bp_addr = dummy_addr; |
672 | break; | |
673 | } | |
04714b91 | 674 | default: |
e2e0b3e5 | 675 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
676 | } |
677 | ||
04714b91 | 678 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 679 | error (_("Too few arguments in function call.")); |
04714b91 | 680 | |
ebc7896c AC |
681 | { |
682 | int i; | |
abbb1732 | 683 | |
ebc7896c AC |
684 | for (i = nargs - 1; i >= 0; i--) |
685 | { | |
686 | int prototyped; | |
687 | struct type *param_type; | |
688 | ||
689 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
690 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
691 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
692 | prototyped = 1; | |
693 | else if (i < TYPE_NFIELDS (ftype)) | |
694 | prototyped = TYPE_PROTOTYPED (ftype); | |
695 | else | |
696 | prototyped = 0; | |
697 | ||
698 | if (i < TYPE_NFIELDS (ftype)) | |
699 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
700 | else | |
701 | param_type = NULL; | |
41f1b697 | 702 | |
7788af6d UW |
703 | args[i] = value_arg_coerce (gdbarch, args[i], |
704 | param_type, prototyped, &sp); | |
ebc7896c | 705 | |
41f1b697 DJ |
706 | if (param_type != NULL && language_pass_by_reference (param_type)) |
707 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
708 | } |
709 | } | |
04714b91 | 710 | |
04714b91 AC |
711 | /* Reserve space for the return structure to be written on the |
712 | stack, if necessary. Make certain that the value is correctly | |
1777feb0 | 713 | aligned. */ |
04714b91 | 714 | |
41f1b697 | 715 | if (struct_return || lang_struct_return) |
04714b91 | 716 | { |
df407dfe | 717 | int len = TYPE_LENGTH (values_type); |
abbb1732 | 718 | |
0b9dfe2b | 719 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
720 | { |
721 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
722 | making space for the return value. */ | |
723 | sp -= len; | |
0b9dfe2b MD |
724 | if (gdbarch_frame_align_p (gdbarch)) |
725 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
726 | struct_addr = sp; |
727 | } | |
728 | else | |
729 | { | |
730 | /* Stack grows upward. Align the frame, allocate space, and | |
1777feb0 | 731 | then again, re-align the frame??? */ |
0b9dfe2b MD |
732 | if (gdbarch_frame_align_p (gdbarch)) |
733 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
734 | struct_addr = sp; |
735 | sp += len; | |
0b9dfe2b MD |
736 | if (gdbarch_frame_align_p (gdbarch)) |
737 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
738 | } |
739 | } | |
740 | ||
41f1b697 DJ |
741 | if (lang_struct_return) |
742 | { | |
743 | struct value **new_args; | |
744 | ||
745 | /* Add the new argument to the front of the argument list. */ | |
746 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
747 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
748 | struct_addr); | |
749 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
750 | args = new_args; | |
751 | nargs++; | |
752 | args_cleanup = make_cleanup (xfree, args); | |
753 | } | |
754 | else | |
755 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
756 | ||
04714b91 AC |
757 | /* Create the dummy stack frame. Pass in the call dummy address as, |
758 | presumably, the ABI code knows where, in the call dummy, the | |
759 | return address should be pointed. */ | |
0b9dfe2b MD |
760 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
761 | bp_addr, nargs, args, | |
594f7785 | 762 | sp, struct_return, struct_addr); |
04714b91 | 763 | |
41f1b697 DJ |
764 | do_cleanups (args_cleanup); |
765 | ||
96860204 AC |
766 | /* Set up a frame ID for the dummy frame so we can pass it to |
767 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
768 | ID so that the breakpoint code can correctly re-identify the | |
769 | dummy breakpoint. */ | |
8241eaa6 | 770 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 771 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 772 | the frame ID's stack address. */ |
96860204 | 773 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 774 | |
74cfe982 AC |
775 | /* Create a momentary breakpoint at the return address of the |
776 | inferior. That way it breaks when it returns. */ | |
04714b91 | 777 | |
74cfe982 AC |
778 | { |
779 | struct breakpoint *bpt; | |
780 | struct symtab_and_line sal; | |
abbb1732 | 781 | |
74cfe982 | 782 | init_sal (&sal); /* initialize to zeroes */ |
6c95b8df | 783 | sal.pspace = current_program_space; |
74cfe982 AC |
784 | sal.pc = bp_addr; |
785 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
786 | /* Sanity. The exact same SP value is returned by |
787 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 788 | dummy_id to form the frame ID's stack address. */ |
a6d9a66e | 789 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
74cfe982 AC |
790 | bpt->disposition = disp_del; |
791 | } | |
04714b91 | 792 | |
7cd1089b PM |
793 | /* Create a breakpoint in std::terminate. |
794 | If a C++ exception is raised in the dummy-frame, and the | |
795 | exception handler is (normally, and expected to be) out-of-frame, | |
796 | the default C++ handler will (wrongly) be called in an inferior | |
797 | function call. This is wrong, as an exception can be normally | |
798 | and legally handled out-of-frame. The confines of the dummy frame | |
799 | prevent the unwinder from finding the correct handler (or any | |
800 | handler, unless it is in-frame). The default handler calls | |
801 | std::terminate. This will kill the inferior. Assert that | |
802 | terminate should never be called in an inferior function | |
803 | call. Place a momentary breakpoint in the std::terminate function | |
804 | and if triggered in the call, rewind. */ | |
805 | if (unwind_on_terminating_exception_p) | |
aa7d318d | 806 | set_std_terminate_breakpoint (); |
7cd1089b | 807 | |
96860204 AC |
808 | /* Everything's ready, push all the info needed to restore the |
809 | caller (and identify the dummy-frame) onto the dummy-frame | |
810 | stack. */ | |
b89667eb DE |
811 | dummy_frame_push (caller_state, &dummy_id); |
812 | ||
813 | /* Discard both inf_status and caller_state cleanups. | |
814 | From this point on we explicitly restore the associated state | |
815 | or discard it. */ | |
816 | discard_cleanups (inf_status_cleanup); | |
96860204 | 817 | |
7cd1089b | 818 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
aa7d318d TT |
819 | terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint, |
820 | NULL); | |
7cd1089b | 821 | |
96860204 AC |
822 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
823 | If you're looking to implement asynchronous dummy-frames, then | |
824 | just below is the place to chop this function in two.. */ | |
825 | ||
b89667eb DE |
826 | /* TP is invalid after run_inferior_call returns, so enclose this |
827 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 828 | { |
32400beb | 829 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 830 | |
b89667eb DE |
831 | /* Save this thread's ptid, we need it later but the thread |
832 | may have exited. */ | |
833 | call_thread_ptid = tp->ptid; | |
74cfe982 | 834 | |
b89667eb | 835 | /* Run the inferior until it stops. */ |
f5871ec0 | 836 | |
b89667eb | 837 | e = run_inferior_call (tp, real_pc); |
52557533 | 838 | } |
04714b91 | 839 | |
b89667eb DE |
840 | /* Rethrow an error if we got one trying to run the inferior. */ |
841 | ||
842 | if (e.reason < 0) | |
843 | { | |
844 | const char *name = get_function_name (funaddr, | |
845 | name_buf, sizeof (name_buf)); | |
846 | ||
16c381f0 | 847 | discard_infcall_control_state (inf_status); |
b89667eb DE |
848 | |
849 | /* We could discard the dummy frame here if the program exited, | |
850 | but it will get garbage collected the next time the program is | |
851 | run anyway. */ | |
852 | ||
853 | switch (e.reason) | |
854 | { | |
855 | case RETURN_ERROR: | |
ac74f770 MS |
856 | throw_error (e.error, _("%s\n\ |
857 | An error occurred while in a function called from GDB.\n\ | |
858 | Evaluation of the expression containing the function\n\ | |
859 | (%s) will be abandoned.\n\ | |
860 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
861 | e.message, name); |
862 | case RETURN_QUIT: | |
863 | default: | |
864 | throw_exception (e); | |
865 | } | |
866 | } | |
867 | ||
868 | /* If the program has exited, or we stopped at a different thread, | |
869 | exit and inform the user. */ | |
870 | ||
de04a248 DE |
871 | if (! target_has_execution) |
872 | { | |
b89667eb DE |
873 | const char *name = get_function_name (funaddr, |
874 | name_buf, sizeof (name_buf)); | |
875 | ||
876 | /* If we try to restore the inferior status, | |
de04a248 | 877 | we'll crash as the inferior is no longer running. */ |
16c381f0 | 878 | discard_infcall_control_state (inf_status); |
b89667eb DE |
879 | |
880 | /* We could discard the dummy frame here given that the program exited, | |
881 | but it will get garbage collected the next time the program is | |
882 | run anyway. */ | |
883 | ||
3e43a32a MS |
884 | error (_("The program being debugged exited while in a function " |
885 | "called from GDB.\n" | |
886 | "Evaluation of the expression containing the function\n" | |
887 | "(%s) will be abandoned."), | |
b89667eb DE |
888 | name); |
889 | } | |
890 | ||
891 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
892 | { | |
893 | const char *name = get_function_name (funaddr, | |
894 | name_buf, sizeof (name_buf)); | |
895 | ||
896 | /* We've switched threads. This can happen if another thread gets a | |
897 | signal or breakpoint while our thread was running. | |
898 | There's no point in restoring the inferior status, | |
899 | we're in a different thread. */ | |
16c381f0 | 900 | discard_infcall_control_state (inf_status); |
b89667eb DE |
901 | /* Keep the dummy frame record, if the user switches back to the |
902 | thread with the hand-call, we'll need it. */ | |
903 | if (stopped_by_random_signal) | |
ac74f770 MS |
904 | error (_("\ |
905 | The program received a signal in another thread while\n\ | |
906 | making a function call from GDB.\n\ | |
907 | Evaluation of the expression containing the function\n\ | |
908 | (%s) will be abandoned.\n\ | |
909 | When the function is done executing, GDB will silently stop."), | |
b89667eb DE |
910 | name); |
911 | else | |
ac74f770 MS |
912 | error (_("\ |
913 | The program stopped in another thread while making a function call from GDB.\n\ | |
914 | Evaluation of the expression containing the function\n\ | |
915 | (%s) will be abandoned.\n\ | |
916 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 917 | name); |
de04a248 DE |
918 | } |
919 | ||
aa7d318d | 920 | if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY) |
52557533 | 921 | { |
b89667eb DE |
922 | const char *name = get_function_name (funaddr, |
923 | name_buf, sizeof (name_buf)); | |
924 | ||
52557533 AC |
925 | if (stopped_by_random_signal) |
926 | { | |
927 | /* We stopped inside the FUNCTION because of a random | |
928 | signal. Further execution of the FUNCTION is not | |
1777feb0 | 929 | allowed. */ |
04714b91 | 930 | |
52557533 AC |
931 | if (unwind_on_signal_p) |
932 | { | |
1777feb0 | 933 | /* The user wants the context restored. */ |
52557533 AC |
934 | |
935 | /* We must get back to the frame we were before the | |
b89667eb DE |
936 | dummy call. */ |
937 | dummy_frame_pop (dummy_id); | |
938 | ||
939 | /* We also need to restore inferior status to that before the | |
940 | dummy call. */ | |
16c381f0 | 941 | restore_infcall_control_state (inf_status); |
04714b91 | 942 | |
52557533 AC |
943 | /* FIXME: Insert a bunch of wrap_here; name can be very |
944 | long if it's a C++ name with arguments and stuff. */ | |
ac74f770 MS |
945 | error (_("\ |
946 | The program being debugged was signaled while in a function called from GDB.\n\ | |
947 | GDB has restored the context to what it was before the call.\n\ | |
948 | To change this behavior use \"set unwindonsignal off\".\n\ | |
949 | Evaluation of the expression containing the function\n\ | |
950 | (%s) will be abandoned."), | |
52557533 AC |
951 | name); |
952 | } | |
953 | else | |
954 | { | |
955 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
956 | (default). |
957 | Discard inferior status, we're not at the same point | |
958 | we started at. */ | |
16c381f0 | 959 | discard_infcall_control_state (inf_status); |
b89667eb | 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 remains in the frame where the signal was received.\n\ | |
966 | To change this behavior use \"set unwindonsignal on\".\n\ | |
967 | Evaluation of the expression containing the function\n\ | |
968 | (%s) will be abandoned.\n\ | |
969 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
970 | name); |
971 | } | |
972 | } | |
04714b91 | 973 | |
aa7d318d | 974 | if (stop_stack_dummy == STOP_STD_TERMINATE) |
52557533 | 975 | { |
aa7d318d TT |
976 | /* We must get back to the frame we were before the dummy |
977 | call. */ | |
978 | dummy_frame_pop (dummy_id); | |
7cd1089b | 979 | |
aa7d318d TT |
980 | /* We also need to restore inferior status to that before |
981 | the dummy call. */ | |
16c381f0 | 982 | restore_infcall_control_state (inf_status); |
aa7d318d | 983 | |
ac74f770 MS |
984 | error (_("\ |
985 | The program being debugged entered a std::terminate call, most likely\n\ | |
986 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
987 | to prevent the program from being terminated, and has restored the\n\ | |
988 | context to its original state before the call.\n\ | |
989 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
990 | Evaluation of the expression containing the function (%s)\n\ | |
991 | will be abandoned."), | |
aa7d318d TT |
992 | name); |
993 | } | |
994 | else if (stop_stack_dummy == STOP_NONE) | |
995 | { | |
996 | ||
b89667eb DE |
997 | /* We hit a breakpoint inside the FUNCTION. |
998 | Keep the dummy frame, the user may want to examine its state. | |
999 | Discard inferior status, we're not at the same point | |
1000 | we started at. */ | |
16c381f0 | 1001 | discard_infcall_control_state (inf_status); |
b89667eb | 1002 | |
52557533 AC |
1003 | /* The following error message used to say "The expression |
1004 | which contained the function call has been discarded." | |
1005 | It is a hard concept to explain in a few words. Ideally, | |
1006 | GDB would be able to resume evaluation of the expression | |
1007 | when the function finally is done executing. Perhaps | |
1008 | someday this will be implemented (it would not be easy). */ | |
1009 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
1010 | a C++ name with arguments and stuff. */ | |
ac74f770 MS |
1011 | error (_("\ |
1012 | The program being debugged stopped while in a function called from GDB.\n\ | |
1013 | Evaluation of the expression containing the function\n\ | |
1014 | (%s) will be abandoned.\n\ | |
1015 | When the function is done executing, GDB will silently stop."), | |
b89667eb | 1016 | name); |
52557533 AC |
1017 | } |
1018 | ||
1019 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 1020 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 1021 | } |
04714b91 | 1022 | |
aa7d318d | 1023 | do_cleanups (terminate_bp_cleanup); |
2f2da8f6 | 1024 | |
b89667eb DE |
1025 | /* If we get here the called FUNCTION ran to completion, |
1026 | and the dummy frame has already been popped. */ | |
74cfe982 | 1027 | |
44e5158b | 1028 | { |
d37346f0 DJ |
1029 | struct address_space *aspace = get_regcache_aspace (stop_registers); |
1030 | struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); | |
b89667eb | 1031 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); |
1a4d7a36 MK |
1032 | struct value *retval = NULL; |
1033 | ||
b89667eb DE |
1034 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
1035 | ||
1036 | /* Inferior call is successful. Restore the inferior status. | |
1037 | At this stage, leave the RETBUF alone. */ | |
16c381f0 | 1038 | restore_infcall_control_state (inf_status); |
b89667eb DE |
1039 | |
1040 | /* Figure out the value returned by the function. */ | |
81b4675a | 1041 | retval = allocate_value (values_type); |
b89667eb | 1042 | |
41f1b697 | 1043 | if (lang_struct_return) |
81b4675a UW |
1044 | read_value_memory (retval, 0, 1, struct_addr, |
1045 | value_contents_raw (retval), | |
1046 | TYPE_LENGTH (values_type)); | |
1047 | else if (TYPE_CODE (target_values_type) != TYPE_CODE_VOID) | |
44e5158b | 1048 | { |
1a4d7a36 MK |
1049 | /* If the function returns void, don't bother fetching the |
1050 | return value. */ | |
c055b101 CV |
1051 | switch (gdbarch_return_value (gdbarch, value_type (function), |
1052 | target_values_type, NULL, NULL, NULL)) | |
1a4d7a36 MK |
1053 | { |
1054 | case RETURN_VALUE_REGISTER_CONVENTION: | |
1055 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: | |
1056 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: | |
c055b101 CV |
1057 | gdbarch_return_value (gdbarch, value_type (function), values_type, |
1058 | retbuf, value_contents_raw (retval), NULL); | |
1a4d7a36 MK |
1059 | break; |
1060 | case RETURN_VALUE_STRUCT_CONVENTION: | |
81b4675a UW |
1061 | read_value_memory (retval, 0, 1, struct_addr, |
1062 | value_contents_raw (retval), | |
1063 | TYPE_LENGTH (values_type)); | |
1a4d7a36 MK |
1064 | break; |
1065 | } | |
1066 | } | |
1067 | ||
44e5158b | 1068 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 1069 | |
b89667eb | 1070 | gdb_assert (retval); |
44e5158b AC |
1071 | return retval; |
1072 | } | |
04714b91 | 1073 | } |
1a4d7a36 | 1074 | \f |
04714b91 | 1075 | |
1a4d7a36 | 1076 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
1077 | void _initialize_infcall (void); |
1078 | ||
1079 | void | |
1080 | _initialize_infcall (void) | |
1081 | { | |
1082 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1083 | &coerce_float_to_double_p, _("\ |
1084 | Set coercion of floats to doubles when calling functions."), _("\ | |
1085 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1086 | Variables of type float should generally be converted to doubles before\n\ |
1087 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1088 | function. However, some older debug info formats do not provide enough\n\ | |
1089 | information to determine that a function is prototyped. If this flag is\n\ | |
1090 | set, GDB will perform the conversion for a function it considers\n\ | |
1091 | unprototyped.\n\ | |
7915a72c | 1092 | The default is to perform the conversion.\n"), |
2c5b56ce | 1093 | NULL, |
920d2a44 | 1094 | show_coerce_float_to_double_p, |
2c5b56ce | 1095 | &setlist, &showlist); |
04714b91 AC |
1096 | |
1097 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1098 | &unwind_on_signal_p, _("\ |
1099 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1100 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1101 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1102 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1103 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1104 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1105 | NULL, |
920d2a44 | 1106 | show_unwind_on_signal_p, |
2c5b56ce | 1107 | &setlist, &showlist); |
7cd1089b PM |
1108 | |
1109 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1110 | &unwind_on_terminating_exception_p, _("\ | |
1111 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
3e43a32a MS |
1112 | Show unwinding of stack if std::terminate() is called while in a call dummy."), |
1113 | _("\ | |
7cd1089b PM |
1114 | The unwind on terminating exception flag lets the user determine\n\ |
1115 | what gdb should do if a std::terminate() call is made from the\n\ | |
1116 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1117 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1118 | std::terminate call to proceed.\n\ | |
1119 | The default is to unwind the frame."), | |
1120 | NULL, | |
1121 | show_unwind_on_terminating_exception_p, | |
1122 | &setlist, &showlist); | |
1123 | ||
04714b91 | 1124 | } |