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, |
4c38e0a4 | 5 | 2008, 2009, 2010 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 | { | |
80 | fprintf_filtered (file, _("\ | |
81 | Coercion of floats to doubles when calling functions is %s.\n"), | |
82 | value); | |
83 | } | |
04714b91 AC |
84 | |
85 | /* This boolean tells what gdb should do if a signal is received while | |
86 | in a function called from gdb (call dummy). If set, gdb unwinds | |
87 | the stack and restore the context to what as it was before the | |
88 | call. | |
89 | ||
90 | The default is to stop in the frame where the signal was received. */ | |
91 | ||
92 | int unwind_on_signal_p = 0; | |
920d2a44 AC |
93 | static void |
94 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, | |
95 | struct cmd_list_element *c, const char *value) | |
96 | { | |
97 | fprintf_filtered (file, _("\ | |
98 | Unwinding of stack if a signal is received while in a call dummy is %s.\n"), | |
99 | value); | |
100 | } | |
101 | ||
7cd1089b PM |
102 | /* This boolean tells what gdb should do if a std::terminate call is |
103 | made while in a function called from gdb (call dummy). | |
104 | As the confines of a single dummy stack prohibit out-of-frame | |
105 | handlers from handling a raised exception, and as out-of-frame | |
106 | handlers are common in C++, this can lead to no handler being found | |
107 | by the unwinder, and a std::terminate call. This is a false positive. | |
108 | If set, gdb unwinds the stack and restores the context to what it | |
109 | was before the call. | |
110 | ||
111 | The default is to unwind the frame if a std::terminate call is | |
112 | made. */ | |
113 | ||
114 | static int unwind_on_terminating_exception_p = 1; | |
115 | ||
116 | static void | |
117 | show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, | |
118 | struct cmd_list_element *c, | |
119 | const char *value) | |
120 | ||
121 | { | |
122 | fprintf_filtered (file, _("\ | |
123 | Unwind stack if a C++ exception is unhandled while in a call dummy is %s.\n"), | |
124 | value); | |
125 | } | |
04714b91 AC |
126 | |
127 | /* Perform the standard coercions that are specified | |
a93c0eb6 | 128 | for arguments to be passed to C or Ada functions. |
04714b91 AC |
129 | |
130 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
a93c0eb6 JB |
131 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
132 | SP is the stack pointer were additional data can be pushed (updating | |
133 | its value as needed). */ | |
04714b91 AC |
134 | |
135 | static struct value * | |
7788af6d UW |
136 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
137 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) | |
04714b91 | 138 | { |
7788af6d | 139 | const struct builtin_type *builtin = builtin_type (gdbarch); |
df407dfe | 140 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 141 | struct type *type |
04714b91 AC |
142 | = param_type ? check_typedef (param_type) : arg_type; |
143 | ||
a93c0eb6 JB |
144 | /* Perform any Ada-specific coercion first. */ |
145 | if (current_language->la_language == language_ada) | |
4a399546 | 146 | arg = ada_convert_actual (arg, type, gdbarch, sp); |
a93c0eb6 | 147 | |
63092375 DJ |
148 | /* Force the value to the target if we will need its address. At |
149 | this point, we could allocate arguments on the stack instead of | |
150 | calling malloc if we knew that their addresses would not be | |
151 | saved by the called function. */ | |
152 | arg = value_coerce_to_target (arg); | |
153 | ||
04714b91 AC |
154 | switch (TYPE_CODE (type)) |
155 | { | |
156 | case TYPE_CODE_REF: | |
fb933624 DJ |
157 | { |
158 | struct value *new_value; | |
159 | ||
160 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) | |
161 | return value_cast_pointers (type, arg); | |
162 | ||
163 | /* Cast the value to the reference's target type, and then | |
164 | convert it back to a reference. This will issue an error | |
165 | if the value was not previously in memory - in some cases | |
166 | we should clearly be allowing this, but how? */ | |
167 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); | |
168 | new_value = value_ref (new_value); | |
169 | return new_value; | |
170 | } | |
04714b91 AC |
171 | case TYPE_CODE_INT: |
172 | case TYPE_CODE_CHAR: | |
173 | case TYPE_CODE_BOOL: | |
174 | case TYPE_CODE_ENUM: | |
175 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
176 | if (!is_prototyped) | |
177 | { | |
7788af6d UW |
178 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
179 | type = builtin->builtin_int; | |
04714b91 AC |
180 | } |
181 | /* Currently all target ABIs require at least the width of an integer | |
182 | type for an argument. We may have to conditionalize the following | |
183 | type coercion for future targets. */ | |
7788af6d UW |
184 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
185 | type = builtin->builtin_int; | |
04714b91 AC |
186 | break; |
187 | case TYPE_CODE_FLT: | |
188 | if (!is_prototyped && coerce_float_to_double_p) | |
189 | { | |
7788af6d UW |
190 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
191 | type = builtin->builtin_double; | |
192 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) | |
193 | type = builtin->builtin_long_double; | |
04714b91 AC |
194 | } |
195 | break; | |
196 | case TYPE_CODE_FUNC: | |
197 | type = lookup_pointer_type (type); | |
198 | break; | |
199 | case TYPE_CODE_ARRAY: | |
200 | /* Arrays are coerced to pointers to their first element, unless | |
201 | they are vectors, in which case we want to leave them alone, | |
202 | because they are passed by value. */ | |
203 | if (current_language->c_style_arrays) | |
204 | if (!TYPE_VECTOR (type)) | |
205 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
206 | break; | |
207 | case TYPE_CODE_UNDEF: | |
208 | case TYPE_CODE_PTR: | |
209 | case TYPE_CODE_STRUCT: | |
210 | case TYPE_CODE_UNION: | |
211 | case TYPE_CODE_VOID: | |
212 | case TYPE_CODE_SET: | |
213 | case TYPE_CODE_RANGE: | |
214 | case TYPE_CODE_STRING: | |
215 | case TYPE_CODE_BITSTRING: | |
216 | case TYPE_CODE_ERROR: | |
0d5de010 DJ |
217 | case TYPE_CODE_MEMBERPTR: |
218 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
219 | case TYPE_CODE_METHOD: |
220 | case TYPE_CODE_COMPLEX: | |
221 | default: | |
222 | break; | |
223 | } | |
224 | ||
225 | return value_cast (type, arg); | |
226 | } | |
227 | ||
228 | /* Determine a function's address and its return type from its value. | |
229 | Calls error() if the function is not valid for calling. */ | |
230 | ||
a9fa03de | 231 | CORE_ADDR |
04714b91 AC |
232 | find_function_addr (struct value *function, struct type **retval_type) |
233 | { | |
df407dfe | 234 | struct type *ftype = check_typedef (value_type (function)); |
50810684 | 235 | struct gdbarch *gdbarch = get_type_arch (ftype); |
52f0bd74 | 236 | enum type_code code = TYPE_CODE (ftype); |
7788af6d | 237 | struct type *value_type = NULL; |
04714b91 AC |
238 | CORE_ADDR funaddr; |
239 | ||
240 | /* If it's a member function, just look at the function | |
241 | part of it. */ | |
242 | ||
243 | /* Determine address to call. */ | |
244 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) | |
245 | { | |
42ae5230 | 246 | funaddr = value_address (function); |
04714b91 AC |
247 | value_type = TYPE_TARGET_TYPE (ftype); |
248 | } | |
249 | else if (code == TYPE_CODE_PTR) | |
250 | { | |
251 | funaddr = value_as_address (function); | |
252 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
253 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
254 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
255 | { | |
50810684 | 256 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
e2d0e7eb | 257 | ¤t_target); |
04714b91 AC |
258 | value_type = TYPE_TARGET_TYPE (ftype); |
259 | } | |
04714b91 AC |
260 | } |
261 | else if (code == TYPE_CODE_INT) | |
262 | { | |
263 | /* Handle the case of functions lacking debugging info. | |
264 | Their values are characters since their addresses are char */ | |
265 | if (TYPE_LENGTH (ftype) == 1) | |
266 | funaddr = value_as_address (value_addr (function)); | |
267 | else | |
2bbe3cc1 DJ |
268 | { |
269 | /* Handle function descriptors lacking debug info. */ | |
270 | int found_descriptor = 0; | |
87bc73ea | 271 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
272 | if (VALUE_LVAL (function) == lval_memory) |
273 | { | |
274 | CORE_ADDR nfunaddr; | |
275 | funaddr = value_as_address (value_addr (function)); | |
276 | nfunaddr = funaddr; | |
50810684 | 277 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
2bbe3cc1 DJ |
278 | ¤t_target); |
279 | if (funaddr != nfunaddr) | |
280 | found_descriptor = 1; | |
281 | } | |
282 | if (!found_descriptor) | |
283 | /* Handle integer used as address of a function. */ | |
284 | funaddr = (CORE_ADDR) value_as_long (function); | |
285 | } | |
04714b91 AC |
286 | } |
287 | else | |
8a3fe4f8 | 288 | error (_("Invalid data type for function to be called.")); |
04714b91 | 289 | |
7d9b040b RC |
290 | if (retval_type != NULL) |
291 | *retval_type = value_type; | |
50810684 | 292 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
04714b91 AC |
293 | } |
294 | ||
d3712828 AC |
295 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
296 | function returns to. */ | |
7043d8dc AC |
297 | |
298 | static CORE_ADDR | |
299 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 300 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
301 | struct value **args, int nargs, |
302 | struct type *value_type, | |
e4fd649a UW |
303 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
304 | struct regcache *regcache) | |
7043d8dc | 305 | { |
50a834af MK |
306 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
307 | ||
308 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
309 | args, nargs, value_type, real_pc, bp_addr, | |
310 | regcache); | |
7043d8dc AC |
311 | } |
312 | ||
b89667eb DE |
313 | /* Fetch the name of the function at FUNADDR. |
314 | This is used in printing an error message for call_function_by_hand. | |
315 | BUF is used to print FUNADDR in hex if the function name cannot be | |
316 | determined. It must be large enough to hold formatted result of | |
317 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
318 | ||
319 | static const char * | |
320 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
321 | { | |
322 | { | |
323 | struct symbol *symbol = find_pc_function (funaddr); | |
324 | if (symbol) | |
325 | return SYMBOL_PRINT_NAME (symbol); | |
326 | } | |
327 | ||
328 | { | |
329 | /* Try the minimal symbols. */ | |
330 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); | |
331 | if (msymbol) | |
332 | return SYMBOL_PRINT_NAME (msymbol); | |
333 | } | |
334 | ||
335 | { | |
336 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
337 | hex_string (funaddr)); | |
338 | gdb_assert (strlen (tmp) + 1 <= buf_size); | |
339 | strcpy (buf, tmp); | |
340 | xfree (tmp); | |
341 | return buf; | |
342 | } | |
343 | } | |
344 | ||
345 | /* Subroutine of call_function_by_hand to simplify it. | |
346 | Start up the inferior and wait for it to stop. | |
347 | Return the exception if there's an error, or an exception with | |
348 | reason >= 0 if there's no error. | |
349 | ||
350 | This is done inside a TRY_CATCH so the caller needn't worry about | |
351 | thrown errors. The caller should rethrow if there's an error. */ | |
352 | ||
353 | static struct gdb_exception | |
354 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
355 | { | |
356 | volatile struct gdb_exception e; | |
357 | int saved_async = 0; | |
c5a4d20b | 358 | int saved_in_infcall = call_thread->in_infcall; |
b89667eb DE |
359 | ptid_t call_thread_ptid = call_thread->ptid; |
360 | char *saved_target_shortname = xstrdup (target_shortname); | |
361 | ||
c5a4d20b PA |
362 | call_thread->in_infcall = 1; |
363 | ||
b89667eb DE |
364 | clear_proceed_status (); |
365 | ||
366 | disable_watchpoints_before_interactive_call_start (); | |
367 | call_thread->proceed_to_finish = 1; /* We want stop_registers, please... */ | |
368 | ||
369 | if (target_can_async_p ()) | |
370 | saved_async = target_async_mask (0); | |
371 | ||
b89667eb DE |
372 | TRY_CATCH (e, RETURN_MASK_ALL) |
373 | proceed (real_pc, TARGET_SIGNAL_0, 0); | |
374 | ||
c5a4d20b PA |
375 | /* At this point the current thread may have changed. Refresh |
376 | CALL_THREAD as it could be invalid if its thread has exited. */ | |
e09875d4 | 377 | call_thread = find_thread_ptid (call_thread_ptid); |
b89667eb DE |
378 | |
379 | /* Don't restore the async mask if the target has changed, | |
380 | saved_async is for the original target. */ | |
381 | if (saved_async | |
382 | && strcmp (saved_target_shortname, target_shortname) == 0) | |
383 | target_async_mask (saved_async); | |
384 | ||
385 | enable_watchpoints_after_interactive_call_stop (); | |
386 | ||
387 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
388 | of inferior call thread. | |
389 | If all error()s out of proceed ended up calling normal_stop | |
390 | (and perhaps they should; it already does in the special case | |
391 | of error out of resume()), then we wouldn't need this. */ | |
392 | if (e.reason < 0) | |
393 | { | |
c5a4d20b PA |
394 | if (call_thread != NULL) |
395 | breakpoint_auto_delete (call_thread->stop_bpstat); | |
b89667eb DE |
396 | } |
397 | ||
c5a4d20b PA |
398 | if (call_thread != NULL) |
399 | call_thread->in_infcall = saved_in_infcall; | |
400 | ||
b89667eb DE |
401 | xfree (saved_target_shortname); |
402 | ||
403 | return e; | |
404 | } | |
405 | ||
04714b91 AC |
406 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
407 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
408 | frame which looks just like a real frame is so that if you call a | |
409 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
410 | will look right. Whether the backtrace needs to actually show the | |
411 | stack at the time the inferior function was called is debatable, but | |
412 | it certainly needs to not display garbage. So if you are contemplating | |
413 | making dummy frames be different from normal frames, consider that. */ | |
414 | ||
415 | /* Perform a function call in the inferior. | |
416 | ARGS is a vector of values of arguments (NARGS of them). | |
417 | FUNCTION is a value, the function to be called. | |
418 | Returns a value representing what the function returned. | |
419 | May fail to return, if a breakpoint or signal is hit | |
420 | during the execution of the function. | |
421 | ||
422 | ARGS is modified to contain coerced values. */ | |
423 | ||
424 | struct value * | |
425 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
426 | { | |
52f0bd74 | 427 | CORE_ADDR sp; |
41f1b697 DJ |
428 | struct type *values_type, *target_values_type; |
429 | unsigned char struct_return = 0, lang_struct_return = 0; | |
04714b91 | 430 | CORE_ADDR struct_addr = 0; |
04714b91 AC |
431 | struct inferior_status *inf_status; |
432 | struct cleanup *inf_status_cleanup; | |
b89667eb DE |
433 | struct inferior_thread_state *caller_state; |
434 | struct cleanup *caller_state_cleanup; | |
04714b91 | 435 | CORE_ADDR funaddr; |
04714b91 | 436 | CORE_ADDR real_pc; |
df407dfe | 437 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 438 | CORE_ADDR bp_addr; |
96860204 | 439 | struct frame_id dummy_id; |
41f1b697 | 440 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
441 | struct frame_info *frame; |
442 | struct gdbarch *gdbarch; | |
7cd1089b PM |
443 | struct breakpoint *terminate_bp = NULL; |
444 | struct minimal_symbol *tm; | |
2f2da8f6 | 445 | struct cleanup *terminate_bp_cleanup = NULL; |
b89667eb DE |
446 | ptid_t call_thread_ptid; |
447 | struct gdb_exception e; | |
448 | const char *name; | |
449 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; | |
04714b91 | 450 | |
4c850810 DJ |
451 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
452 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
453 | ||
04714b91 AC |
454 | if (!target_has_execution) |
455 | noprocess (); | |
456 | ||
573cda03 SS |
457 | if (get_traceframe_number () >= 0) |
458 | error (_("May not call functions while looking at trace frames.")); | |
459 | ||
0b9dfe2b MD |
460 | frame = get_current_frame (); |
461 | gdbarch = get_frame_arch (frame); | |
462 | ||
463 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 464 | error (_("This target does not support function calls.")); |
a86c5fc9 | 465 | |
b89667eb DE |
466 | /* A cleanup for the inferior status. |
467 | This is only needed while we're preparing the inferior function call. */ | |
468 | inf_status = save_inferior_status (); | |
04714b91 AC |
469 | inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status); |
470 | ||
b89667eb DE |
471 | /* Save the caller's registers and other state associated with the |
472 | inferior itself so that they can be restored once the | |
96860204 AC |
473 | callee returns. To allow nested calls the registers are (further |
474 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
475 | is tossed once the regcache has been pushed). */ | |
b89667eb DE |
476 | caller_state = save_inferior_thread_state (); |
477 | caller_state_cleanup = make_cleanup_restore_inferior_thread_state (caller_state); | |
04714b91 | 478 | |
04714b91 | 479 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 480 | { |
0b9dfe2b MD |
481 | CORE_ADDR old_sp = get_frame_sp (frame); |
482 | if (gdbarch_frame_align_p (gdbarch)) | |
ebc7896c | 483 | { |
0b9dfe2b | 484 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
485 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
486 | ABIs, a function can use memory beyond the inner most stack | |
487 | address. AMD64 called that region the "red zone". Skip at | |
488 | least the "red zone" size before allocating any space on | |
489 | the stack. */ | |
0b9dfe2b MD |
490 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
491 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 492 | else |
0b9dfe2b | 493 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 494 | /* Still aligned? */ |
0b9dfe2b | 495 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
496 | /* NOTE: cagney/2002-09-18: |
497 | ||
498 | On a RISC architecture, a void parameterless generic dummy | |
499 | frame (i.e., no parameters, no result) typically does not | |
500 | need to push anything the stack and hence can leave SP and | |
c48a845b | 501 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
502 | not push anything on the stack and, hence, that too can |
503 | leave FP and SP unchanged. As a consequence, a sequence of | |
504 | void parameterless generic dummy frame calls to frameless | |
505 | functions will create a sequence of effectively identical | |
506 | frames (SP, FP and TOS and PC the same). This, not | |
507 | suprisingly, results in what appears to be a stack in an | |
508 | infinite loop --- when GDB tries to find a generic dummy | |
509 | frame on the internal dummy frame stack, it will always | |
510 | find the first one. | |
511 | ||
512 | To avoid this problem, the code below always grows the | |
513 | stack. That way, two dummy frames can never be identical. | |
514 | It does burn a few bytes of stack but that is a small price | |
515 | to pay :-). */ | |
ebc7896c AC |
516 | if (sp == old_sp) |
517 | { | |
0b9dfe2b | 518 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 519 | /* Stack grows down. */ |
0b9dfe2b | 520 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
521 | else |
522 | /* Stack grows up. */ | |
0b9dfe2b | 523 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 524 | } |
0e095b7e JK |
525 | /* SP may have underflown address zero here from OLD_SP. Memory access |
526 | functions will probably fail in such case but that is a target's | |
527 | problem. */ | |
ebc7896c AC |
528 | } |
529 | else | |
a59fe496 AC |
530 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
531 | ||
8b148df9 AC |
532 | Who knows how badly aligned the SP is! |
533 | ||
534 | If the generic dummy frame ends up empty (because nothing is | |
535 | pushed) GDB won't be able to correctly perform back traces. | |
536 | If a target is having trouble with backtraces, first thing to | |
537 | do is add FRAME_ALIGN() to the architecture vector. If that | |
669fac23 | 538 | fails, try dummy_id(). |
8b148df9 AC |
539 | |
540 | If the ABI specifies a "Red Zone" (see the doco) the code | |
541 | below will quietly trash it. */ | |
ebc7896c AC |
542 | sp = old_sp; |
543 | } | |
04714b91 | 544 | |
df407dfe | 545 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
546 | if (!values_type) |
547 | values_type = builtin_type (gdbarch)->builtin_int; | |
548 | ||
df407dfe | 549 | CHECK_TYPEDEF (values_type); |
04714b91 | 550 | |
41f1b697 DJ |
551 | /* Are we returning a value using a structure return (passing a |
552 | hidden argument pointing to storage) or a normal value return? | |
553 | There are two cases: language-mandated structure return and | |
554 | target ABI structure return. The variable STRUCT_RETURN only | |
555 | describes the latter. The language version is handled by passing | |
556 | the return location as the first parameter to the function, | |
557 | even preceding "this". This is different from the target | |
558 | ABI version, which is target-specific; for instance, on ia64 | |
559 | the first argument is passed in out0 but the hidden structure | |
560 | return pointer would normally be passed in r8. */ | |
561 | ||
562 | if (language_pass_by_reference (values_type)) | |
563 | { | |
564 | lang_struct_return = 1; | |
04714b91 | 565 | |
41f1b697 DJ |
566 | /* Tell the target specific argument pushing routine not to |
567 | expect a value. */ | |
48319d1f | 568 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
569 | } |
570 | else | |
571 | { | |
d80b854b UW |
572 | struct_return = using_struct_return (gdbarch, |
573 | value_type (function), values_type); | |
41f1b697 DJ |
574 | target_values_type = values_type; |
575 | } | |
04714b91 | 576 | |
7043d8dc AC |
577 | /* Determine the location of the breakpoint (and possibly other |
578 | stuff) that the called function will return to. The SPARC, for a | |
579 | function returning a structure or union, needs to make space for | |
580 | not just the breakpoint but also an extra word containing the | |
581 | size (?) of the structure being passed. */ | |
582 | ||
583 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there | |
584 | is no need to write that out. */ | |
585 | ||
0b9dfe2b | 586 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
587 | { |
588 | case ON_STACK: | |
3b676233 | 589 | sp = push_dummy_code (gdbarch, sp, funaddr, |
82585c72 | 590 | args, nargs, target_values_type, |
594f7785 | 591 | &real_pc, &bp_addr, get_current_regcache ()); |
7043d8dc | 592 | break; |
04714b91 | 593 | case AT_ENTRY_POINT: |
3b676233 DE |
594 | { |
595 | CORE_ADDR dummy_addr; | |
596 | ||
597 | real_pc = funaddr; | |
598 | dummy_addr = entry_point_address (); | |
3b676233 DE |
599 | /* A call dummy always consists of just a single breakpoint, so |
600 | its address is the same as the address of the dummy. */ | |
601 | bp_addr = dummy_addr; | |
602 | break; | |
603 | } | |
9710e734 AC |
604 | case AT_SYMBOL: |
605 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose | |
606 | address is the location where the breakpoint should be | |
607 | placed. Once all targets are using the overhauled frame code | |
608 | this can be deleted - ON_STACK is a better option. */ | |
609 | { | |
610 | struct minimal_symbol *sym; | |
3b676233 | 611 | CORE_ADDR dummy_addr; |
9710e734 AC |
612 | |
613 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); | |
614 | real_pc = funaddr; | |
615 | if (sym) | |
3612b192 DJ |
616 | { |
617 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); | |
618 | /* Make certain that the address points at real code, and not | |
619 | a function descriptor. */ | |
620 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
621 | dummy_addr, | |
622 | ¤t_target); | |
623 | } | |
9710e734 AC |
624 | else |
625 | dummy_addr = entry_point_address (); | |
0285512f AC |
626 | /* A call dummy always consists of just a single breakpoint, |
627 | so it's address is the same as the address of the dummy. */ | |
9710e734 AC |
628 | bp_addr = dummy_addr; |
629 | break; | |
630 | } | |
04714b91 | 631 | default: |
e2e0b3e5 | 632 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
633 | } |
634 | ||
04714b91 | 635 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 636 | error (_("Too few arguments in function call.")); |
04714b91 | 637 | |
ebc7896c AC |
638 | { |
639 | int i; | |
640 | for (i = nargs - 1; i >= 0; i--) | |
641 | { | |
642 | int prototyped; | |
643 | struct type *param_type; | |
644 | ||
645 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
646 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
647 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
648 | prototyped = 1; | |
649 | else if (i < TYPE_NFIELDS (ftype)) | |
650 | prototyped = TYPE_PROTOTYPED (ftype); | |
651 | else | |
652 | prototyped = 0; | |
653 | ||
654 | if (i < TYPE_NFIELDS (ftype)) | |
655 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
656 | else | |
657 | param_type = NULL; | |
41f1b697 | 658 | |
7788af6d UW |
659 | args[i] = value_arg_coerce (gdbarch, args[i], |
660 | param_type, prototyped, &sp); | |
ebc7896c | 661 | |
41f1b697 DJ |
662 | if (param_type != NULL && language_pass_by_reference (param_type)) |
663 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
664 | } |
665 | } | |
04714b91 | 666 | |
04714b91 AC |
667 | /* Reserve space for the return structure to be written on the |
668 | stack, if necessary. Make certain that the value is correctly | |
669 | aligned. */ | |
670 | ||
41f1b697 | 671 | if (struct_return || lang_struct_return) |
04714b91 | 672 | { |
df407dfe | 673 | int len = TYPE_LENGTH (values_type); |
0b9dfe2b | 674 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
675 | { |
676 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
677 | making space for the return value. */ | |
678 | sp -= len; | |
0b9dfe2b MD |
679 | if (gdbarch_frame_align_p (gdbarch)) |
680 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
681 | struct_addr = sp; |
682 | } | |
683 | else | |
684 | { | |
685 | /* Stack grows upward. Align the frame, allocate space, and | |
686 | then again, re-align the frame??? */ | |
0b9dfe2b MD |
687 | if (gdbarch_frame_align_p (gdbarch)) |
688 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
689 | struct_addr = sp; |
690 | sp += len; | |
0b9dfe2b MD |
691 | if (gdbarch_frame_align_p (gdbarch)) |
692 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
693 | } |
694 | } | |
695 | ||
41f1b697 DJ |
696 | if (lang_struct_return) |
697 | { | |
698 | struct value **new_args; | |
699 | ||
700 | /* Add the new argument to the front of the argument list. */ | |
701 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
702 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
703 | struct_addr); | |
704 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
705 | args = new_args; | |
706 | nargs++; | |
707 | args_cleanup = make_cleanup (xfree, args); | |
708 | } | |
709 | else | |
710 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
711 | ||
04714b91 AC |
712 | /* Create the dummy stack frame. Pass in the call dummy address as, |
713 | presumably, the ABI code knows where, in the call dummy, the | |
714 | return address should be pointed. */ | |
0b9dfe2b MD |
715 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
716 | bp_addr, nargs, args, | |
594f7785 | 717 | sp, struct_return, struct_addr); |
04714b91 | 718 | |
41f1b697 DJ |
719 | do_cleanups (args_cleanup); |
720 | ||
96860204 AC |
721 | /* Set up a frame ID for the dummy frame so we can pass it to |
722 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
723 | ID so that the breakpoint code can correctly re-identify the | |
724 | dummy breakpoint. */ | |
8241eaa6 | 725 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 726 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 727 | the frame ID's stack address. */ |
96860204 | 728 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 729 | |
74cfe982 AC |
730 | /* Create a momentary breakpoint at the return address of the |
731 | inferior. That way it breaks when it returns. */ | |
04714b91 | 732 | |
74cfe982 AC |
733 | { |
734 | struct breakpoint *bpt; | |
735 | struct symtab_and_line sal; | |
74cfe982 | 736 | init_sal (&sal); /* initialize to zeroes */ |
6c95b8df | 737 | sal.pspace = current_program_space; |
74cfe982 AC |
738 | sal.pc = bp_addr; |
739 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
740 | /* Sanity. The exact same SP value is returned by |
741 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 742 | dummy_id to form the frame ID's stack address. */ |
a6d9a66e | 743 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
74cfe982 AC |
744 | bpt->disposition = disp_del; |
745 | } | |
04714b91 | 746 | |
7cd1089b PM |
747 | /* Create a breakpoint in std::terminate. |
748 | If a C++ exception is raised in the dummy-frame, and the | |
749 | exception handler is (normally, and expected to be) out-of-frame, | |
750 | the default C++ handler will (wrongly) be called in an inferior | |
751 | function call. This is wrong, as an exception can be normally | |
752 | and legally handled out-of-frame. The confines of the dummy frame | |
753 | prevent the unwinder from finding the correct handler (or any | |
754 | handler, unless it is in-frame). The default handler calls | |
755 | std::terminate. This will kill the inferior. Assert that | |
756 | terminate should never be called in an inferior function | |
757 | call. Place a momentary breakpoint in the std::terminate function | |
758 | and if triggered in the call, rewind. */ | |
759 | if (unwind_on_terminating_exception_p) | |
760 | { | |
761 | struct minimal_symbol *tm = lookup_minimal_symbol ("std::terminate()", | |
762 | NULL, NULL); | |
763 | if (tm != NULL) | |
764 | terminate_bp = set_momentary_breakpoint_at_pc | |
a6d9a66e | 765 | (gdbarch, SYMBOL_VALUE_ADDRESS (tm), bp_breakpoint); |
7cd1089b PM |
766 | } |
767 | ||
96860204 AC |
768 | /* Everything's ready, push all the info needed to restore the |
769 | caller (and identify the dummy-frame) onto the dummy-frame | |
770 | stack. */ | |
b89667eb DE |
771 | dummy_frame_push (caller_state, &dummy_id); |
772 | ||
773 | /* Discard both inf_status and caller_state cleanups. | |
774 | From this point on we explicitly restore the associated state | |
775 | or discard it. */ | |
776 | discard_cleanups (inf_status_cleanup); | |
96860204 | 777 | |
7cd1089b PM |
778 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
779 | if (terminate_bp) | |
2f2da8f6 | 780 | terminate_bp_cleanup = make_cleanup_delete_breakpoint (terminate_bp); |
7cd1089b | 781 | |
96860204 AC |
782 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
783 | If you're looking to implement asynchronous dummy-frames, then | |
784 | just below is the place to chop this function in two.. */ | |
785 | ||
b89667eb DE |
786 | /* TP is invalid after run_inferior_call returns, so enclose this |
787 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 788 | { |
32400beb | 789 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 790 | |
b89667eb DE |
791 | /* Save this thread's ptid, we need it later but the thread |
792 | may have exited. */ | |
793 | call_thread_ptid = tp->ptid; | |
74cfe982 | 794 | |
b89667eb | 795 | /* Run the inferior until it stops. */ |
f5871ec0 | 796 | |
b89667eb | 797 | e = run_inferior_call (tp, real_pc); |
52557533 | 798 | } |
04714b91 | 799 | |
b89667eb DE |
800 | /* Rethrow an error if we got one trying to run the inferior. */ |
801 | ||
802 | if (e.reason < 0) | |
803 | { | |
804 | const char *name = get_function_name (funaddr, | |
805 | name_buf, sizeof (name_buf)); | |
806 | ||
807 | discard_inferior_status (inf_status); | |
808 | ||
809 | /* We could discard the dummy frame here if the program exited, | |
810 | but it will get garbage collected the next time the program is | |
811 | run anyway. */ | |
812 | ||
813 | switch (e.reason) | |
814 | { | |
815 | case RETURN_ERROR: | |
816 | throw_error (e.error, _("\ | |
817 | %s\n\ | |
818 | An error occurred while in a function called from GDB.\n\ | |
819 | Evaluation of the expression containing the function\n\ | |
820 | (%s) will be abandoned.\n\ | |
821 | When the function is done executing, GDB will silently stop."), | |
822 | e.message, name); | |
823 | case RETURN_QUIT: | |
824 | default: | |
825 | throw_exception (e); | |
826 | } | |
827 | } | |
828 | ||
829 | /* If the program has exited, or we stopped at a different thread, | |
830 | exit and inform the user. */ | |
831 | ||
de04a248 DE |
832 | if (! target_has_execution) |
833 | { | |
b89667eb DE |
834 | const char *name = get_function_name (funaddr, |
835 | name_buf, sizeof (name_buf)); | |
836 | ||
837 | /* If we try to restore the inferior status, | |
de04a248 | 838 | we'll crash as the inferior is no longer running. */ |
de04a248 | 839 | discard_inferior_status (inf_status); |
b89667eb DE |
840 | |
841 | /* We could discard the dummy frame here given that the program exited, | |
842 | but it will get garbage collected the next time the program is | |
843 | run anyway. */ | |
844 | ||
de04a248 | 845 | error (_("\ |
b89667eb DE |
846 | The program being debugged exited while in a function called from GDB.\n\ |
847 | Evaluation of the expression containing the function\n\ | |
848 | (%s) will be abandoned."), | |
849 | name); | |
850 | } | |
851 | ||
852 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
853 | { | |
854 | const char *name = get_function_name (funaddr, | |
855 | name_buf, sizeof (name_buf)); | |
856 | ||
857 | /* We've switched threads. This can happen if another thread gets a | |
858 | signal or breakpoint while our thread was running. | |
859 | There's no point in restoring the inferior status, | |
860 | we're in a different thread. */ | |
861 | discard_inferior_status (inf_status); | |
862 | /* Keep the dummy frame record, if the user switches back to the | |
863 | thread with the hand-call, we'll need it. */ | |
864 | if (stopped_by_random_signal) | |
865 | error (_("\ | |
866 | The program received a signal in another thread while\n\ | |
867 | making a function call from GDB.\n\ | |
868 | Evaluation of the expression containing the function\n\ | |
869 | (%s) will be abandoned.\n\ | |
870 | When the function is done executing, GDB will silently stop."), | |
871 | name); | |
872 | else | |
873 | error (_("\ | |
874 | The program stopped in another thread while making a function call from GDB.\n\ | |
875 | Evaluation of the expression containing the function\n\ | |
876 | (%s) will be abandoned.\n\ | |
877 | When the function is done executing, GDB will silently stop."), | |
878 | name); | |
de04a248 DE |
879 | } |
880 | ||
52557533 AC |
881 | if (stopped_by_random_signal || !stop_stack_dummy) |
882 | { | |
b89667eb DE |
883 | const char *name = get_function_name (funaddr, |
884 | name_buf, sizeof (name_buf)); | |
885 | ||
52557533 AC |
886 | if (stopped_by_random_signal) |
887 | { | |
888 | /* We stopped inside the FUNCTION because of a random | |
889 | signal. Further execution of the FUNCTION is not | |
890 | allowed. */ | |
04714b91 | 891 | |
52557533 AC |
892 | if (unwind_on_signal_p) |
893 | { | |
894 | /* The user wants the context restored. */ | |
895 | ||
896 | /* We must get back to the frame we were before the | |
b89667eb DE |
897 | dummy call. */ |
898 | dummy_frame_pop (dummy_id); | |
899 | ||
900 | /* We also need to restore inferior status to that before the | |
901 | dummy call. */ | |
902 | restore_inferior_status (inf_status); | |
04714b91 | 903 | |
52557533 AC |
904 | /* FIXME: Insert a bunch of wrap_here; name can be very |
905 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 906 | error (_("\ |
04714b91 AC |
907 | The program being debugged was signaled while in a function called from GDB.\n\ |
908 | GDB has restored the context to what it was before the call.\n\ | |
2e74121d | 909 | To change this behavior use \"set unwindonsignal off\".\n\ |
b89667eb DE |
910 | Evaluation of the expression containing the function\n\ |
911 | (%s) will be abandoned."), | |
52557533 AC |
912 | name); |
913 | } | |
914 | else | |
915 | { | |
916 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
917 | (default). |
918 | Discard inferior status, we're not at the same point | |
919 | we started at. */ | |
52557533 | 920 | discard_inferior_status (inf_status); |
b89667eb | 921 | |
52557533 AC |
922 | /* FIXME: Insert a bunch of wrap_here; name can be very |
923 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 924 | error (_("\ |
04714b91 AC |
925 | The program being debugged was signaled while in a function called from GDB.\n\ |
926 | GDB remains in the frame where the signal was received.\n\ | |
2e74121d | 927 | To change this behavior use \"set unwindonsignal on\".\n\ |
b89667eb DE |
928 | Evaluation of the expression containing the function\n\ |
929 | (%s) will be abandoned.\n\ | |
930 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
931 | name); |
932 | } | |
933 | } | |
04714b91 | 934 | |
52557533 AC |
935 | if (!stop_stack_dummy) |
936 | { | |
7cd1089b PM |
937 | |
938 | /* Check if unwind on terminating exception behaviour is on. */ | |
939 | if (unwind_on_terminating_exception_p) | |
940 | { | |
941 | /* Check that the breakpoint is our special std::terminate | |
942 | breakpoint. If it is, we do not want to kill the inferior | |
943 | in an inferior function call. Rewind, and warn the | |
944 | user. */ | |
945 | ||
946 | if (terminate_bp != NULL | |
88e3b899 | 947 | && (inferior_thread ()->stop_bpstat->breakpoint_at->address |
7cd1089b PM |
948 | == terminate_bp->loc->address)) |
949 | { | |
950 | /* We must get back to the frame we were before the | |
951 | dummy call. */ | |
952 | dummy_frame_pop (dummy_id); | |
953 | ||
954 | /* We also need to restore inferior status to that before the | |
955 | dummy call. */ | |
956 | restore_inferior_status (inf_status); | |
957 | ||
958 | error (_("\ | |
959 | The program being debugged entered a std::terminate call, most likely\n\ | |
960 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
961 | to prevent the program from being terminated, and has restored the\n\ | |
962 | context to its original state before the call.\n\ | |
963 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
964 | Evaluation of the expression containing the function (%s)\n\ | |
965 | will be abandoned."), | |
966 | name); | |
967 | } | |
968 | } | |
b89667eb DE |
969 | /* We hit a breakpoint inside the FUNCTION. |
970 | Keep the dummy frame, the user may want to examine its state. | |
971 | Discard inferior status, we're not at the same point | |
972 | we started at. */ | |
52557533 | 973 | discard_inferior_status (inf_status); |
b89667eb | 974 | |
52557533 AC |
975 | /* The following error message used to say "The expression |
976 | which contained the function call has been discarded." | |
977 | It is a hard concept to explain in a few words. Ideally, | |
978 | GDB would be able to resume evaluation of the expression | |
979 | when the function finally is done executing. Perhaps | |
980 | someday this will be implemented (it would not be easy). */ | |
981 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
982 | a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 983 | error (_("\ |
04714b91 | 984 | The program being debugged stopped while in a function called from GDB.\n\ |
b89667eb DE |
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."), | |
988 | name); | |
52557533 AC |
989 | } |
990 | ||
991 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 992 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 993 | } |
04714b91 | 994 | |
2f2da8f6 PM |
995 | /* If we get here and the std::terminate() breakpoint has been set, |
996 | it has to be cleaned manually. */ | |
997 | if (terminate_bp) | |
998 | do_cleanups (terminate_bp_cleanup); | |
999 | ||
b89667eb DE |
1000 | /* If we get here the called FUNCTION ran to completion, |
1001 | and the dummy frame has already been popped. */ | |
74cfe982 | 1002 | |
44e5158b | 1003 | { |
d37346f0 DJ |
1004 | struct address_space *aspace = get_regcache_aspace (stop_registers); |
1005 | struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace); | |
b89667eb | 1006 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); |
1a4d7a36 MK |
1007 | struct value *retval = NULL; |
1008 | ||
b89667eb DE |
1009 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
1010 | ||
1011 | /* Inferior call is successful. Restore the inferior status. | |
1012 | At this stage, leave the RETBUF alone. */ | |
1013 | restore_inferior_status (inf_status); | |
1014 | ||
1015 | /* Figure out the value returned by the function. */ | |
1016 | ||
41f1b697 DJ |
1017 | if (lang_struct_return) |
1018 | retval = value_at (values_type, struct_addr); | |
1019 | else if (TYPE_CODE (target_values_type) == TYPE_CODE_VOID) | |
44e5158b | 1020 | { |
1a4d7a36 MK |
1021 | /* If the function returns void, don't bother fetching the |
1022 | return value. */ | |
df407dfe | 1023 | retval = allocate_value (values_type); |
44e5158b | 1024 | } |
1a4d7a36 MK |
1025 | else |
1026 | { | |
c055b101 CV |
1027 | switch (gdbarch_return_value (gdbarch, value_type (function), |
1028 | target_values_type, NULL, NULL, NULL)) | |
1a4d7a36 MK |
1029 | { |
1030 | case RETURN_VALUE_REGISTER_CONVENTION: | |
1031 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: | |
1032 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: | |
1033 | retval = allocate_value (values_type); | |
c055b101 CV |
1034 | gdbarch_return_value (gdbarch, value_type (function), values_type, |
1035 | retbuf, value_contents_raw (retval), NULL); | |
1a4d7a36 MK |
1036 | break; |
1037 | case RETURN_VALUE_STRUCT_CONVENTION: | |
1038 | retval = value_at (values_type, struct_addr); | |
1039 | break; | |
1040 | } | |
1041 | } | |
1042 | ||
44e5158b | 1043 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 1044 | |
b89667eb | 1045 | gdb_assert (retval); |
44e5158b AC |
1046 | return retval; |
1047 | } | |
04714b91 | 1048 | } |
1a4d7a36 | 1049 | \f |
04714b91 | 1050 | |
1a4d7a36 | 1051 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
1052 | void _initialize_infcall (void); |
1053 | ||
1054 | void | |
1055 | _initialize_infcall (void) | |
1056 | { | |
1057 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1058 | &coerce_float_to_double_p, _("\ |
1059 | Set coercion of floats to doubles when calling functions."), _("\ | |
1060 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1061 | Variables of type float should generally be converted to doubles before\n\ |
1062 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1063 | function. However, some older debug info formats do not provide enough\n\ | |
1064 | information to determine that a function is prototyped. If this flag is\n\ | |
1065 | set, GDB will perform the conversion for a function it considers\n\ | |
1066 | unprototyped.\n\ | |
7915a72c | 1067 | The default is to perform the conversion.\n"), |
2c5b56ce | 1068 | NULL, |
920d2a44 | 1069 | show_coerce_float_to_double_p, |
2c5b56ce | 1070 | &setlist, &showlist); |
04714b91 AC |
1071 | |
1072 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1073 | &unwind_on_signal_p, _("\ |
1074 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1075 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1076 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1077 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1078 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1079 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1080 | NULL, |
920d2a44 | 1081 | show_unwind_on_signal_p, |
2c5b56ce | 1082 | &setlist, &showlist); |
7cd1089b PM |
1083 | |
1084 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1085 | &unwind_on_terminating_exception_p, _("\ | |
1086 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
1087 | Show unwinding of stack if std::terminate() is called while in a call dummy."), _("\ | |
1088 | The unwind on terminating exception flag lets the user determine\n\ | |
1089 | what gdb should do if a std::terminate() call is made from the\n\ | |
1090 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1091 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1092 | std::terminate call to proceed.\n\ | |
1093 | The default is to unwind the frame."), | |
1094 | NULL, | |
1095 | show_unwind_on_terminating_exception_p, | |
1096 | &setlist, &showlist); | |
1097 | ||
04714b91 | 1098 | } |