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" | |
24 | #include "target.h" | |
25 | #include "regcache.h" | |
26 | #include "inferior.h" | |
27 | #include "gdb_assert.h" | |
28 | #include "block.h" | |
29 | #include "gdbcore.h" | |
30 | #include "language.h" | |
9ab9195f | 31 | #include "objfiles.h" |
04714b91 AC |
32 | #include "gdbcmd.h" |
33 | #include "command.h" | |
34 | #include "gdb_string.h" | |
b9362cc7 | 35 | #include "infcall.h" |
96860204 | 36 | #include "dummy-frame.h" |
a93c0eb6 | 37 | #include "ada-lang.h" |
347bddb7 | 38 | #include "gdbthread.h" |
b89667eb DE |
39 | #include "exceptions.h" |
40 | ||
41 | /* If we can't find a function's name from its address, | |
42 | we print this instead. */ | |
43 | #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s" | |
44 | #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \ | |
45 | + 2 * sizeof (CORE_ADDR)) | |
04714b91 AC |
46 | |
47 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
48 | ||
49 | GDB needs an asynchronous expression evaluator, that means an | |
50 | asynchronous inferior function call implementation, and that in | |
51 | turn means restructuring the code so that it is event driven. */ | |
52 | ||
53 | /* How you should pass arguments to a function depends on whether it | |
54 | was defined in K&R style or prototype style. If you define a | |
55 | function using the K&R syntax that takes a `float' argument, then | |
56 | callers must pass that argument as a `double'. If you define the | |
57 | function using the prototype syntax, then you must pass the | |
58 | argument as a `float', with no promotion. | |
59 | ||
60 | Unfortunately, on certain older platforms, the debug info doesn't | |
61 | indicate reliably how each function was defined. A function type's | |
62 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was | |
63 | defined in prototype style. When calling a function whose | |
64 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to | |
65 | decide what to do. | |
66 | ||
67 | For modern targets, it is proper to assume that, if the prototype | |
68 | flag is clear, that can be trusted: `float' arguments should be | |
69 | promoted to `double'. For some older targets, if the prototype | |
70 | flag is clear, that doesn't tell us anything. The default is to | |
71 | trust the debug information; the user can override this behavior | |
72 | with "set coerce-float-to-double 0". */ | |
73 | ||
74 | static int coerce_float_to_double_p = 1; | |
920d2a44 AC |
75 | static void |
76 | show_coerce_float_to_double_p (struct ui_file *file, int from_tty, | |
77 | struct cmd_list_element *c, const char *value) | |
78 | { | |
79 | fprintf_filtered (file, _("\ | |
80 | Coercion of floats to doubles when calling functions is %s.\n"), | |
81 | value); | |
82 | } | |
04714b91 AC |
83 | |
84 | /* This boolean tells what gdb should do if a signal is received while | |
85 | in a function called from gdb (call dummy). If set, gdb unwinds | |
86 | the stack and restore the context to what as it was before the | |
87 | call. | |
88 | ||
89 | The default is to stop in the frame where the signal was received. */ | |
90 | ||
91 | int unwind_on_signal_p = 0; | |
920d2a44 AC |
92 | static void |
93 | show_unwind_on_signal_p (struct ui_file *file, int from_tty, | |
94 | struct cmd_list_element *c, const char *value) | |
95 | { | |
96 | fprintf_filtered (file, _("\ | |
97 | Unwinding of stack if a signal is received while in a call dummy is %s.\n"), | |
98 | value); | |
99 | } | |
100 | ||
7cd1089b PM |
101 | /* This boolean tells what gdb should do if a std::terminate call is |
102 | made while in a function called from gdb (call dummy). | |
103 | As the confines of a single dummy stack prohibit out-of-frame | |
104 | handlers from handling a raised exception, and as out-of-frame | |
105 | handlers are common in C++, this can lead to no handler being found | |
106 | by the unwinder, and a std::terminate call. This is a false positive. | |
107 | If set, gdb unwinds the stack and restores the context to what it | |
108 | was before the call. | |
109 | ||
110 | The default is to unwind the frame if a std::terminate call is | |
111 | made. */ | |
112 | ||
113 | static int unwind_on_terminating_exception_p = 1; | |
114 | ||
115 | static void | |
116 | show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty, | |
117 | struct cmd_list_element *c, | |
118 | const char *value) | |
119 | ||
120 | { | |
121 | fprintf_filtered (file, _("\ | |
122 | Unwind stack if a C++ exception is unhandled while in a call dummy is %s.\n"), | |
123 | value); | |
124 | } | |
04714b91 AC |
125 | |
126 | /* Perform the standard coercions that are specified | |
a93c0eb6 | 127 | for arguments to be passed to C or Ada functions. |
04714b91 AC |
128 | |
129 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
a93c0eb6 JB |
130 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. |
131 | SP is the stack pointer were additional data can be pushed (updating | |
132 | its value as needed). */ | |
04714b91 AC |
133 | |
134 | static struct value * | |
7788af6d UW |
135 | value_arg_coerce (struct gdbarch *gdbarch, struct value *arg, |
136 | struct type *param_type, int is_prototyped, CORE_ADDR *sp) | |
04714b91 | 137 | { |
7788af6d | 138 | const struct builtin_type *builtin = builtin_type (gdbarch); |
df407dfe | 139 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 140 | struct type *type |
04714b91 AC |
141 | = param_type ? check_typedef (param_type) : arg_type; |
142 | ||
a93c0eb6 JB |
143 | /* Perform any Ada-specific coercion first. */ |
144 | if (current_language->la_language == language_ada) | |
4a399546 | 145 | arg = ada_convert_actual (arg, type, gdbarch, sp); |
a93c0eb6 | 146 | |
63092375 DJ |
147 | /* Force the value to the target if we will need its address. At |
148 | this point, we could allocate arguments on the stack instead of | |
149 | calling malloc if we knew that their addresses would not be | |
150 | saved by the called function. */ | |
151 | arg = value_coerce_to_target (arg); | |
152 | ||
04714b91 AC |
153 | switch (TYPE_CODE (type)) |
154 | { | |
155 | case TYPE_CODE_REF: | |
fb933624 DJ |
156 | { |
157 | struct value *new_value; | |
158 | ||
159 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) | |
160 | return value_cast_pointers (type, arg); | |
161 | ||
162 | /* Cast the value to the reference's target type, and then | |
163 | convert it back to a reference. This will issue an error | |
164 | if the value was not previously in memory - in some cases | |
165 | we should clearly be allowing this, but how? */ | |
166 | new_value = value_cast (TYPE_TARGET_TYPE (type), arg); | |
167 | new_value = value_ref (new_value); | |
168 | return new_value; | |
169 | } | |
04714b91 AC |
170 | case TYPE_CODE_INT: |
171 | case TYPE_CODE_CHAR: | |
172 | case TYPE_CODE_BOOL: | |
173 | case TYPE_CODE_ENUM: | |
174 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
175 | if (!is_prototyped) | |
176 | { | |
7788af6d UW |
177 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
178 | type = builtin->builtin_int; | |
04714b91 AC |
179 | } |
180 | /* Currently all target ABIs require at least the width of an integer | |
181 | type for an argument. We may have to conditionalize the following | |
182 | type coercion for future targets. */ | |
7788af6d UW |
183 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int)) |
184 | type = builtin->builtin_int; | |
04714b91 AC |
185 | break; |
186 | case TYPE_CODE_FLT: | |
187 | if (!is_prototyped && coerce_float_to_double_p) | |
188 | { | |
7788af6d UW |
189 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double)) |
190 | type = builtin->builtin_double; | |
191 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double)) | |
192 | type = builtin->builtin_long_double; | |
04714b91 AC |
193 | } |
194 | break; | |
195 | case TYPE_CODE_FUNC: | |
196 | type = lookup_pointer_type (type); | |
197 | break; | |
198 | case TYPE_CODE_ARRAY: | |
199 | /* Arrays are coerced to pointers to their first element, unless | |
200 | they are vectors, in which case we want to leave them alone, | |
201 | because they are passed by value. */ | |
202 | if (current_language->c_style_arrays) | |
203 | if (!TYPE_VECTOR (type)) | |
204 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
205 | break; | |
206 | case TYPE_CODE_UNDEF: | |
207 | case TYPE_CODE_PTR: | |
208 | case TYPE_CODE_STRUCT: | |
209 | case TYPE_CODE_UNION: | |
210 | case TYPE_CODE_VOID: | |
211 | case TYPE_CODE_SET: | |
212 | case TYPE_CODE_RANGE: | |
213 | case TYPE_CODE_STRING: | |
214 | case TYPE_CODE_BITSTRING: | |
215 | case TYPE_CODE_ERROR: | |
0d5de010 DJ |
216 | case TYPE_CODE_MEMBERPTR: |
217 | case TYPE_CODE_METHODPTR: | |
04714b91 AC |
218 | case TYPE_CODE_METHOD: |
219 | case TYPE_CODE_COMPLEX: | |
220 | default: | |
221 | break; | |
222 | } | |
223 | ||
224 | return value_cast (type, arg); | |
225 | } | |
226 | ||
227 | /* Determine a function's address and its return type from its value. | |
228 | Calls error() if the function is not valid for calling. */ | |
229 | ||
a9fa03de | 230 | CORE_ADDR |
04714b91 AC |
231 | find_function_addr (struct value *function, struct type **retval_type) |
232 | { | |
df407dfe | 233 | struct type *ftype = check_typedef (value_type (function)); |
50810684 | 234 | struct gdbarch *gdbarch = get_type_arch (ftype); |
52f0bd74 | 235 | enum type_code code = TYPE_CODE (ftype); |
7788af6d | 236 | struct type *value_type = NULL; |
04714b91 AC |
237 | CORE_ADDR funaddr; |
238 | ||
239 | /* If it's a member function, just look at the function | |
240 | part of it. */ | |
241 | ||
242 | /* Determine address to call. */ | |
243 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) | |
244 | { | |
42ae5230 | 245 | funaddr = value_address (function); |
04714b91 AC |
246 | value_type = TYPE_TARGET_TYPE (ftype); |
247 | } | |
248 | else if (code == TYPE_CODE_PTR) | |
249 | { | |
250 | funaddr = value_as_address (function); | |
251 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
252 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
253 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
254 | { | |
50810684 | 255 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
e2d0e7eb | 256 | ¤t_target); |
04714b91 AC |
257 | value_type = TYPE_TARGET_TYPE (ftype); |
258 | } | |
04714b91 AC |
259 | } |
260 | else if (code == TYPE_CODE_INT) | |
261 | { | |
262 | /* Handle the case of functions lacking debugging info. | |
263 | Their values are characters since their addresses are char */ | |
264 | if (TYPE_LENGTH (ftype) == 1) | |
265 | funaddr = value_as_address (value_addr (function)); | |
266 | else | |
2bbe3cc1 DJ |
267 | { |
268 | /* Handle function descriptors lacking debug info. */ | |
269 | int found_descriptor = 0; | |
87bc73ea | 270 | funaddr = 0; /* pacify "gcc -Werror" */ |
2bbe3cc1 DJ |
271 | if (VALUE_LVAL (function) == lval_memory) |
272 | { | |
273 | CORE_ADDR nfunaddr; | |
274 | funaddr = value_as_address (value_addr (function)); | |
275 | nfunaddr = funaddr; | |
50810684 | 276 | funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr, |
2bbe3cc1 DJ |
277 | ¤t_target); |
278 | if (funaddr != nfunaddr) | |
279 | found_descriptor = 1; | |
280 | } | |
281 | if (!found_descriptor) | |
282 | /* Handle integer used as address of a function. */ | |
283 | funaddr = (CORE_ADDR) value_as_long (function); | |
284 | } | |
04714b91 AC |
285 | } |
286 | else | |
8a3fe4f8 | 287 | error (_("Invalid data type for function to be called.")); |
04714b91 | 288 | |
7d9b040b RC |
289 | if (retval_type != NULL) |
290 | *retval_type = value_type; | |
50810684 | 291 | return funaddr + gdbarch_deprecated_function_start_offset (gdbarch); |
04714b91 AC |
292 | } |
293 | ||
d3712828 AC |
294 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
295 | function returns to. */ | |
7043d8dc AC |
296 | |
297 | static CORE_ADDR | |
298 | push_dummy_code (struct gdbarch *gdbarch, | |
82585c72 | 299 | CORE_ADDR sp, CORE_ADDR funaddr, |
7043d8dc AC |
300 | struct value **args, int nargs, |
301 | struct type *value_type, | |
e4fd649a UW |
302 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
303 | struct regcache *regcache) | |
7043d8dc | 304 | { |
50a834af MK |
305 | gdb_assert (gdbarch_push_dummy_code_p (gdbarch)); |
306 | ||
307 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, | |
308 | args, nargs, value_type, real_pc, bp_addr, | |
309 | regcache); | |
7043d8dc AC |
310 | } |
311 | ||
b89667eb DE |
312 | /* Fetch the name of the function at FUNADDR. |
313 | This is used in printing an error message for call_function_by_hand. | |
314 | BUF is used to print FUNADDR in hex if the function name cannot be | |
315 | determined. It must be large enough to hold formatted result of | |
316 | RAW_FUNCTION_ADDRESS_FORMAT. */ | |
317 | ||
318 | static const char * | |
319 | get_function_name (CORE_ADDR funaddr, char *buf, int buf_size) | |
320 | { | |
321 | { | |
322 | struct symbol *symbol = find_pc_function (funaddr); | |
323 | if (symbol) | |
324 | return SYMBOL_PRINT_NAME (symbol); | |
325 | } | |
326 | ||
327 | { | |
328 | /* Try the minimal symbols. */ | |
329 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); | |
330 | if (msymbol) | |
331 | return SYMBOL_PRINT_NAME (msymbol); | |
332 | } | |
333 | ||
334 | { | |
335 | char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT), | |
336 | hex_string (funaddr)); | |
337 | gdb_assert (strlen (tmp) + 1 <= buf_size); | |
338 | strcpy (buf, tmp); | |
339 | xfree (tmp); | |
340 | return buf; | |
341 | } | |
342 | } | |
343 | ||
344 | /* Subroutine of call_function_by_hand to simplify it. | |
345 | Start up the inferior and wait for it to stop. | |
346 | Return the exception if there's an error, or an exception with | |
347 | reason >= 0 if there's no error. | |
348 | ||
349 | This is done inside a TRY_CATCH so the caller needn't worry about | |
350 | thrown errors. The caller should rethrow if there's an error. */ | |
351 | ||
352 | static struct gdb_exception | |
353 | run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc) | |
354 | { | |
355 | volatile struct gdb_exception e; | |
356 | int saved_async = 0; | |
c5a4d20b | 357 | int saved_in_infcall = call_thread->in_infcall; |
b89667eb DE |
358 | ptid_t call_thread_ptid = call_thread->ptid; |
359 | char *saved_target_shortname = xstrdup (target_shortname); | |
360 | ||
c5a4d20b PA |
361 | call_thread->in_infcall = 1; |
362 | ||
b89667eb DE |
363 | clear_proceed_status (); |
364 | ||
365 | disable_watchpoints_before_interactive_call_start (); | |
366 | call_thread->proceed_to_finish = 1; /* We want stop_registers, please... */ | |
367 | ||
368 | if (target_can_async_p ()) | |
369 | saved_async = target_async_mask (0); | |
370 | ||
b89667eb DE |
371 | TRY_CATCH (e, RETURN_MASK_ALL) |
372 | proceed (real_pc, TARGET_SIGNAL_0, 0); | |
373 | ||
c5a4d20b PA |
374 | /* At this point the current thread may have changed. Refresh |
375 | CALL_THREAD as it could be invalid if its thread has exited. */ | |
e09875d4 | 376 | call_thread = find_thread_ptid (call_thread_ptid); |
b89667eb DE |
377 | |
378 | /* Don't restore the async mask if the target has changed, | |
379 | saved_async is for the original target. */ | |
380 | if (saved_async | |
381 | && strcmp (saved_target_shortname, target_shortname) == 0) | |
382 | target_async_mask (saved_async); | |
383 | ||
384 | enable_watchpoints_after_interactive_call_stop (); | |
385 | ||
386 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
387 | of inferior call thread. | |
388 | If all error()s out of proceed ended up calling normal_stop | |
389 | (and perhaps they should; it already does in the special case | |
390 | of error out of resume()), then we wouldn't need this. */ | |
391 | if (e.reason < 0) | |
392 | { | |
c5a4d20b PA |
393 | if (call_thread != NULL) |
394 | breakpoint_auto_delete (call_thread->stop_bpstat); | |
b89667eb DE |
395 | } |
396 | ||
c5a4d20b PA |
397 | if (call_thread != NULL) |
398 | call_thread->in_infcall = saved_in_infcall; | |
399 | ||
b89667eb DE |
400 | xfree (saved_target_shortname); |
401 | ||
402 | return e; | |
403 | } | |
404 | ||
04714b91 AC |
405 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
406 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
407 | frame which looks just like a real frame is so that if you call a | |
408 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
409 | will look right. Whether the backtrace needs to actually show the | |
410 | stack at the time the inferior function was called is debatable, but | |
411 | it certainly needs to not display garbage. So if you are contemplating | |
412 | making dummy frames be different from normal frames, consider that. */ | |
413 | ||
414 | /* Perform a function call in the inferior. | |
415 | ARGS is a vector of values of arguments (NARGS of them). | |
416 | FUNCTION is a value, the function to be called. | |
417 | Returns a value representing what the function returned. | |
418 | May fail to return, if a breakpoint or signal is hit | |
419 | during the execution of the function. | |
420 | ||
421 | ARGS is modified to contain coerced values. */ | |
422 | ||
423 | struct value * | |
424 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
425 | { | |
52f0bd74 | 426 | CORE_ADDR sp; |
41f1b697 DJ |
427 | struct type *values_type, *target_values_type; |
428 | unsigned char struct_return = 0, lang_struct_return = 0; | |
04714b91 | 429 | CORE_ADDR struct_addr = 0; |
04714b91 AC |
430 | struct inferior_status *inf_status; |
431 | struct cleanup *inf_status_cleanup; | |
b89667eb DE |
432 | struct inferior_thread_state *caller_state; |
433 | struct cleanup *caller_state_cleanup; | |
04714b91 | 434 | CORE_ADDR funaddr; |
04714b91 | 435 | CORE_ADDR real_pc; |
df407dfe | 436 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 437 | CORE_ADDR bp_addr; |
96860204 | 438 | struct frame_id dummy_id; |
41f1b697 | 439 | struct cleanup *args_cleanup; |
0b9dfe2b MD |
440 | struct frame_info *frame; |
441 | struct gdbarch *gdbarch; | |
7cd1089b PM |
442 | struct breakpoint *terminate_bp = NULL; |
443 | struct minimal_symbol *tm; | |
2f2da8f6 | 444 | struct cleanup *terminate_bp_cleanup = NULL; |
b89667eb DE |
445 | ptid_t call_thread_ptid; |
446 | struct gdb_exception e; | |
447 | const char *name; | |
448 | char name_buf[RAW_FUNCTION_ADDRESS_SIZE]; | |
04714b91 | 449 | |
4c850810 DJ |
450 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
451 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
452 | ||
04714b91 AC |
453 | if (!target_has_execution) |
454 | noprocess (); | |
455 | ||
0b9dfe2b MD |
456 | frame = get_current_frame (); |
457 | gdbarch = get_frame_arch (frame); | |
458 | ||
459 | if (!gdbarch_push_dummy_call_p (gdbarch)) | |
2e74121d | 460 | error (_("This target does not support function calls.")); |
a86c5fc9 | 461 | |
b89667eb DE |
462 | /* A cleanup for the inferior status. |
463 | This is only needed while we're preparing the inferior function call. */ | |
464 | inf_status = save_inferior_status (); | |
04714b91 AC |
465 | inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status); |
466 | ||
b89667eb DE |
467 | /* Save the caller's registers and other state associated with the |
468 | inferior itself so that they can be restored once the | |
96860204 AC |
469 | callee returns. To allow nested calls the registers are (further |
470 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
471 | is tossed once the regcache has been pushed). */ | |
b89667eb DE |
472 | caller_state = save_inferior_thread_state (); |
473 | caller_state_cleanup = make_cleanup_restore_inferior_thread_state (caller_state); | |
04714b91 | 474 | |
04714b91 | 475 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c | 476 | { |
0b9dfe2b MD |
477 | CORE_ADDR old_sp = get_frame_sp (frame); |
478 | if (gdbarch_frame_align_p (gdbarch)) | |
ebc7896c | 479 | { |
0b9dfe2b | 480 | sp = gdbarch_frame_align (gdbarch, old_sp); |
8b148df9 AC |
481 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some |
482 | ABIs, a function can use memory beyond the inner most stack | |
483 | address. AMD64 called that region the "red zone". Skip at | |
484 | least the "red zone" size before allocating any space on | |
485 | the stack. */ | |
0b9dfe2b MD |
486 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
487 | sp -= gdbarch_frame_red_zone_size (gdbarch); | |
8b148df9 | 488 | else |
0b9dfe2b | 489 | sp += gdbarch_frame_red_zone_size (gdbarch); |
8b148df9 | 490 | /* Still aligned? */ |
0b9dfe2b | 491 | gdb_assert (sp == gdbarch_frame_align (gdbarch, sp)); |
ebc7896c AC |
492 | /* NOTE: cagney/2002-09-18: |
493 | ||
494 | On a RISC architecture, a void parameterless generic dummy | |
495 | frame (i.e., no parameters, no result) typically does not | |
496 | need to push anything the stack and hence can leave SP and | |
c48a845b | 497 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
498 | not push anything on the stack and, hence, that too can |
499 | leave FP and SP unchanged. As a consequence, a sequence of | |
500 | void parameterless generic dummy frame calls to frameless | |
501 | functions will create a sequence of effectively identical | |
502 | frames (SP, FP and TOS and PC the same). This, not | |
503 | suprisingly, results in what appears to be a stack in an | |
504 | infinite loop --- when GDB tries to find a generic dummy | |
505 | frame on the internal dummy frame stack, it will always | |
506 | find the first one. | |
507 | ||
508 | To avoid this problem, the code below always grows the | |
509 | stack. That way, two dummy frames can never be identical. | |
510 | It does burn a few bytes of stack but that is a small price | |
511 | to pay :-). */ | |
ebc7896c AC |
512 | if (sp == old_sp) |
513 | { | |
0b9dfe2b | 514 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
ebc7896c | 515 | /* Stack grows down. */ |
0b9dfe2b | 516 | sp = gdbarch_frame_align (gdbarch, old_sp - 1); |
ebc7896c AC |
517 | else |
518 | /* Stack grows up. */ | |
0b9dfe2b | 519 | sp = gdbarch_frame_align (gdbarch, old_sp + 1); |
ebc7896c | 520 | } |
0b9dfe2b | 521 | gdb_assert ((gdbarch_inner_than (gdbarch, 1, 2) |
4d1e7dd1 | 522 | && sp <= old_sp) |
0b9dfe2b | 523 | || (gdbarch_inner_than (gdbarch, 2, 1) |
4d1e7dd1 | 524 | && sp >= old_sp)); |
ebc7896c AC |
525 | } |
526 | else | |
a59fe496 AC |
527 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
528 | ||
8b148df9 AC |
529 | Who knows how badly aligned the SP is! |
530 | ||
531 | If the generic dummy frame ends up empty (because nothing is | |
532 | pushed) GDB won't be able to correctly perform back traces. | |
533 | If a target is having trouble with backtraces, first thing to | |
534 | do is add FRAME_ALIGN() to the architecture vector. If that | |
669fac23 | 535 | fails, try dummy_id(). |
8b148df9 AC |
536 | |
537 | If the ABI specifies a "Red Zone" (see the doco) the code | |
538 | below will quietly trash it. */ | |
ebc7896c AC |
539 | sp = old_sp; |
540 | } | |
04714b91 | 541 | |
df407dfe | 542 | funaddr = find_function_addr (function, &values_type); |
7788af6d UW |
543 | if (!values_type) |
544 | values_type = builtin_type (gdbarch)->builtin_int; | |
545 | ||
df407dfe | 546 | CHECK_TYPEDEF (values_type); |
04714b91 | 547 | |
41f1b697 DJ |
548 | /* Are we returning a value using a structure return (passing a |
549 | hidden argument pointing to storage) or a normal value return? | |
550 | There are two cases: language-mandated structure return and | |
551 | target ABI structure return. The variable STRUCT_RETURN only | |
552 | describes the latter. The language version is handled by passing | |
553 | the return location as the first parameter to the function, | |
554 | even preceding "this". This is different from the target | |
555 | ABI version, which is target-specific; for instance, on ia64 | |
556 | the first argument is passed in out0 but the hidden structure | |
557 | return pointer would normally be passed in r8. */ | |
558 | ||
559 | if (language_pass_by_reference (values_type)) | |
560 | { | |
561 | lang_struct_return = 1; | |
04714b91 | 562 | |
41f1b697 DJ |
563 | /* Tell the target specific argument pushing routine not to |
564 | expect a value. */ | |
48319d1f | 565 | target_values_type = builtin_type (gdbarch)->builtin_void; |
41f1b697 DJ |
566 | } |
567 | else | |
568 | { | |
d80b854b UW |
569 | struct_return = using_struct_return (gdbarch, |
570 | value_type (function), values_type); | |
41f1b697 DJ |
571 | target_values_type = values_type; |
572 | } | |
04714b91 | 573 | |
7043d8dc AC |
574 | /* Determine the location of the breakpoint (and possibly other |
575 | stuff) that the called function will return to. The SPARC, for a | |
576 | function returning a structure or union, needs to make space for | |
577 | not just the breakpoint but also an extra word containing the | |
578 | size (?) of the structure being passed. */ | |
579 | ||
580 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there | |
581 | is no need to write that out. */ | |
582 | ||
0b9dfe2b | 583 | switch (gdbarch_call_dummy_location (gdbarch)) |
04714b91 AC |
584 | { |
585 | case ON_STACK: | |
3b676233 | 586 | sp = push_dummy_code (gdbarch, sp, funaddr, |
82585c72 | 587 | args, nargs, target_values_type, |
594f7785 | 588 | &real_pc, &bp_addr, get_current_regcache ()); |
7043d8dc | 589 | break; |
04714b91 | 590 | case AT_ENTRY_POINT: |
3b676233 DE |
591 | { |
592 | CORE_ADDR dummy_addr; | |
593 | ||
594 | real_pc = funaddr; | |
595 | dummy_addr = entry_point_address (); | |
3b676233 DE |
596 | /* A call dummy always consists of just a single breakpoint, so |
597 | its address is the same as the address of the dummy. */ | |
598 | bp_addr = dummy_addr; | |
599 | break; | |
600 | } | |
9710e734 AC |
601 | case AT_SYMBOL: |
602 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose | |
603 | address is the location where the breakpoint should be | |
604 | placed. Once all targets are using the overhauled frame code | |
605 | this can be deleted - ON_STACK is a better option. */ | |
606 | { | |
607 | struct minimal_symbol *sym; | |
3b676233 | 608 | CORE_ADDR dummy_addr; |
9710e734 AC |
609 | |
610 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); | |
611 | real_pc = funaddr; | |
612 | if (sym) | |
3612b192 DJ |
613 | { |
614 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); | |
615 | /* Make certain that the address points at real code, and not | |
616 | a function descriptor. */ | |
617 | dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, | |
618 | dummy_addr, | |
619 | ¤t_target); | |
620 | } | |
9710e734 AC |
621 | else |
622 | dummy_addr = entry_point_address (); | |
0285512f AC |
623 | /* A call dummy always consists of just a single breakpoint, |
624 | so it's address is the same as the address of the dummy. */ | |
9710e734 AC |
625 | bp_addr = dummy_addr; |
626 | break; | |
627 | } | |
04714b91 | 628 | default: |
e2e0b3e5 | 629 | internal_error (__FILE__, __LINE__, _("bad switch")); |
04714b91 AC |
630 | } |
631 | ||
04714b91 | 632 | if (nargs < TYPE_NFIELDS (ftype)) |
2e74121d | 633 | error (_("Too few arguments in function call.")); |
04714b91 | 634 | |
ebc7896c AC |
635 | { |
636 | int i; | |
637 | for (i = nargs - 1; i >= 0; i--) | |
638 | { | |
639 | int prototyped; | |
640 | struct type *param_type; | |
641 | ||
642 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
643 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
644 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
645 | prototyped = 1; | |
646 | else if (i < TYPE_NFIELDS (ftype)) | |
647 | prototyped = TYPE_PROTOTYPED (ftype); | |
648 | else | |
649 | prototyped = 0; | |
650 | ||
651 | if (i < TYPE_NFIELDS (ftype)) | |
652 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
653 | else | |
654 | param_type = NULL; | |
41f1b697 | 655 | |
7788af6d UW |
656 | args[i] = value_arg_coerce (gdbarch, args[i], |
657 | param_type, prototyped, &sp); | |
ebc7896c | 658 | |
41f1b697 DJ |
659 | if (param_type != NULL && language_pass_by_reference (param_type)) |
660 | args[i] = value_addr (args[i]); | |
ebc7896c AC |
661 | } |
662 | } | |
04714b91 | 663 | |
04714b91 AC |
664 | /* Reserve space for the return structure to be written on the |
665 | stack, if necessary. Make certain that the value is correctly | |
666 | aligned. */ | |
667 | ||
41f1b697 | 668 | if (struct_return || lang_struct_return) |
04714b91 | 669 | { |
df407dfe | 670 | int len = TYPE_LENGTH (values_type); |
0b9dfe2b | 671 | if (gdbarch_inner_than (gdbarch, 1, 2)) |
04714b91 AC |
672 | { |
673 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
674 | making space for the return value. */ | |
675 | sp -= len; | |
0b9dfe2b MD |
676 | if (gdbarch_frame_align_p (gdbarch)) |
677 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
678 | struct_addr = sp; |
679 | } | |
680 | else | |
681 | { | |
682 | /* Stack grows upward. Align the frame, allocate space, and | |
683 | then again, re-align the frame??? */ | |
0b9dfe2b MD |
684 | if (gdbarch_frame_align_p (gdbarch)) |
685 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
686 | struct_addr = sp; |
687 | sp += len; | |
0b9dfe2b MD |
688 | if (gdbarch_frame_align_p (gdbarch)) |
689 | sp = gdbarch_frame_align (gdbarch, sp); | |
04714b91 AC |
690 | } |
691 | } | |
692 | ||
41f1b697 DJ |
693 | if (lang_struct_return) |
694 | { | |
695 | struct value **new_args; | |
696 | ||
697 | /* Add the new argument to the front of the argument list. */ | |
698 | new_args = xmalloc (sizeof (struct value *) * (nargs + 1)); | |
699 | new_args[0] = value_from_pointer (lookup_pointer_type (values_type), | |
700 | struct_addr); | |
701 | memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs); | |
702 | args = new_args; | |
703 | nargs++; | |
704 | args_cleanup = make_cleanup (xfree, args); | |
705 | } | |
706 | else | |
707 | args_cleanup = make_cleanup (null_cleanup, NULL); | |
708 | ||
04714b91 AC |
709 | /* Create the dummy stack frame. Pass in the call dummy address as, |
710 | presumably, the ABI code knows where, in the call dummy, the | |
711 | return address should be pointed. */ | |
0b9dfe2b MD |
712 | sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (), |
713 | bp_addr, nargs, args, | |
594f7785 | 714 | sp, struct_return, struct_addr); |
04714b91 | 715 | |
41f1b697 DJ |
716 | do_cleanups (args_cleanup); |
717 | ||
96860204 AC |
718 | /* Set up a frame ID for the dummy frame so we can pass it to |
719 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
720 | ID so that the breakpoint code can correctly re-identify the | |
721 | dummy breakpoint. */ | |
8241eaa6 | 722 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
669fac23 | 723 | saved as the dummy-frame TOS, and used by dummy_id to form |
8241eaa6 | 724 | the frame ID's stack address. */ |
96860204 | 725 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 726 | |
74cfe982 AC |
727 | /* Create a momentary breakpoint at the return address of the |
728 | inferior. That way it breaks when it returns. */ | |
04714b91 | 729 | |
74cfe982 AC |
730 | { |
731 | struct breakpoint *bpt; | |
732 | struct symtab_and_line sal; | |
74cfe982 | 733 | init_sal (&sal); /* initialize to zeroes */ |
6c95b8df | 734 | sal.pspace = current_program_space; |
74cfe982 AC |
735 | sal.pc = bp_addr; |
736 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
737 | /* Sanity. The exact same SP value is returned by |
738 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
669fac23 | 739 | dummy_id to form the frame ID's stack address. */ |
a6d9a66e | 740 | bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy); |
74cfe982 AC |
741 | bpt->disposition = disp_del; |
742 | } | |
04714b91 | 743 | |
7cd1089b PM |
744 | /* Create a breakpoint in std::terminate. |
745 | If a C++ exception is raised in the dummy-frame, and the | |
746 | exception handler is (normally, and expected to be) out-of-frame, | |
747 | the default C++ handler will (wrongly) be called in an inferior | |
748 | function call. This is wrong, as an exception can be normally | |
749 | and legally handled out-of-frame. The confines of the dummy frame | |
750 | prevent the unwinder from finding the correct handler (or any | |
751 | handler, unless it is in-frame). The default handler calls | |
752 | std::terminate. This will kill the inferior. Assert that | |
753 | terminate should never be called in an inferior function | |
754 | call. Place a momentary breakpoint in the std::terminate function | |
755 | and if triggered in the call, rewind. */ | |
756 | if (unwind_on_terminating_exception_p) | |
757 | { | |
758 | struct minimal_symbol *tm = lookup_minimal_symbol ("std::terminate()", | |
759 | NULL, NULL); | |
760 | if (tm != NULL) | |
761 | terminate_bp = set_momentary_breakpoint_at_pc | |
a6d9a66e | 762 | (gdbarch, SYMBOL_VALUE_ADDRESS (tm), bp_breakpoint); |
7cd1089b PM |
763 | } |
764 | ||
96860204 AC |
765 | /* Everything's ready, push all the info needed to restore the |
766 | caller (and identify the dummy-frame) onto the dummy-frame | |
767 | stack. */ | |
b89667eb DE |
768 | dummy_frame_push (caller_state, &dummy_id); |
769 | ||
770 | /* Discard both inf_status and caller_state cleanups. | |
771 | From this point on we explicitly restore the associated state | |
772 | or discard it. */ | |
773 | discard_cleanups (inf_status_cleanup); | |
96860204 | 774 | |
7cd1089b PM |
775 | /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */ |
776 | if (terminate_bp) | |
2f2da8f6 | 777 | terminate_bp_cleanup = make_cleanup_delete_breakpoint (terminate_bp); |
7cd1089b | 778 | |
96860204 AC |
779 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - |
780 | If you're looking to implement asynchronous dummy-frames, then | |
781 | just below is the place to chop this function in two.. */ | |
782 | ||
b89667eb DE |
783 | /* TP is invalid after run_inferior_call returns, so enclose this |
784 | in a block so that it's only in scope during the time it's valid. */ | |
74cfe982 | 785 | { |
32400beb | 786 | struct thread_info *tp = inferior_thread (); |
74cfe982 | 787 | |
b89667eb DE |
788 | /* Save this thread's ptid, we need it later but the thread |
789 | may have exited. */ | |
790 | call_thread_ptid = tp->ptid; | |
74cfe982 | 791 | |
b89667eb | 792 | /* Run the inferior until it stops. */ |
f5871ec0 | 793 | |
b89667eb | 794 | e = run_inferior_call (tp, real_pc); |
52557533 | 795 | } |
04714b91 | 796 | |
b89667eb DE |
797 | /* Rethrow an error if we got one trying to run the inferior. */ |
798 | ||
799 | if (e.reason < 0) | |
800 | { | |
801 | const char *name = get_function_name (funaddr, | |
802 | name_buf, sizeof (name_buf)); | |
803 | ||
804 | discard_inferior_status (inf_status); | |
805 | ||
806 | /* We could discard the dummy frame here if the program exited, | |
807 | but it will get garbage collected the next time the program is | |
808 | run anyway. */ | |
809 | ||
810 | switch (e.reason) | |
811 | { | |
812 | case RETURN_ERROR: | |
813 | throw_error (e.error, _("\ | |
814 | %s\n\ | |
815 | An error occurred while in a function called from GDB.\n\ | |
816 | Evaluation of the expression containing the function\n\ | |
817 | (%s) will be abandoned.\n\ | |
818 | When the function is done executing, GDB will silently stop."), | |
819 | e.message, name); | |
820 | case RETURN_QUIT: | |
821 | default: | |
822 | throw_exception (e); | |
823 | } | |
824 | } | |
825 | ||
826 | /* If the program has exited, or we stopped at a different thread, | |
827 | exit and inform the user. */ | |
828 | ||
de04a248 DE |
829 | if (! target_has_execution) |
830 | { | |
b89667eb DE |
831 | const char *name = get_function_name (funaddr, |
832 | name_buf, sizeof (name_buf)); | |
833 | ||
834 | /* If we try to restore the inferior status, | |
de04a248 | 835 | we'll crash as the inferior is no longer running. */ |
de04a248 | 836 | discard_inferior_status (inf_status); |
b89667eb DE |
837 | |
838 | /* We could discard the dummy frame here given that the program exited, | |
839 | but it will get garbage collected the next time the program is | |
840 | run anyway. */ | |
841 | ||
de04a248 | 842 | error (_("\ |
b89667eb DE |
843 | The program being debugged exited while in a function called from GDB.\n\ |
844 | Evaluation of the expression containing the function\n\ | |
845 | (%s) will be abandoned."), | |
846 | name); | |
847 | } | |
848 | ||
849 | if (! ptid_equal (call_thread_ptid, inferior_ptid)) | |
850 | { | |
851 | const char *name = get_function_name (funaddr, | |
852 | name_buf, sizeof (name_buf)); | |
853 | ||
854 | /* We've switched threads. This can happen if another thread gets a | |
855 | signal or breakpoint while our thread was running. | |
856 | There's no point in restoring the inferior status, | |
857 | we're in a different thread. */ | |
858 | discard_inferior_status (inf_status); | |
859 | /* Keep the dummy frame record, if the user switches back to the | |
860 | thread with the hand-call, we'll need it. */ | |
861 | if (stopped_by_random_signal) | |
862 | error (_("\ | |
863 | The program received a signal in another thread while\n\ | |
864 | making a function call from GDB.\n\ | |
865 | Evaluation of the expression containing the function\n\ | |
866 | (%s) will be abandoned.\n\ | |
867 | When the function is done executing, GDB will silently stop."), | |
868 | name); | |
869 | else | |
870 | error (_("\ | |
871 | The program stopped in another thread while making a function call from GDB.\n\ | |
872 | Evaluation of the expression containing the function\n\ | |
873 | (%s) will be abandoned.\n\ | |
874 | When the function is done executing, GDB will silently stop."), | |
875 | name); | |
de04a248 DE |
876 | } |
877 | ||
52557533 AC |
878 | if (stopped_by_random_signal || !stop_stack_dummy) |
879 | { | |
b89667eb DE |
880 | const char *name = get_function_name (funaddr, |
881 | name_buf, sizeof (name_buf)); | |
882 | ||
52557533 AC |
883 | if (stopped_by_random_signal) |
884 | { | |
885 | /* We stopped inside the FUNCTION because of a random | |
886 | signal. Further execution of the FUNCTION is not | |
887 | allowed. */ | |
04714b91 | 888 | |
52557533 AC |
889 | if (unwind_on_signal_p) |
890 | { | |
891 | /* The user wants the context restored. */ | |
892 | ||
893 | /* We must get back to the frame we were before the | |
b89667eb DE |
894 | dummy call. */ |
895 | dummy_frame_pop (dummy_id); | |
896 | ||
897 | /* We also need to restore inferior status to that before the | |
898 | dummy call. */ | |
899 | restore_inferior_status (inf_status); | |
04714b91 | 900 | |
52557533 AC |
901 | /* FIXME: Insert a bunch of wrap_here; name can be very |
902 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 903 | error (_("\ |
04714b91 AC |
904 | The program being debugged was signaled while in a function called from GDB.\n\ |
905 | GDB has restored the context to what it was before the call.\n\ | |
2e74121d | 906 | To change this behavior use \"set unwindonsignal off\".\n\ |
b89667eb DE |
907 | Evaluation of the expression containing the function\n\ |
908 | (%s) will be abandoned."), | |
52557533 AC |
909 | name); |
910 | } | |
911 | else | |
912 | { | |
913 | /* The user wants to stay in the frame where we stopped | |
b89667eb DE |
914 | (default). |
915 | Discard inferior status, we're not at the same point | |
916 | we started at. */ | |
52557533 | 917 | discard_inferior_status (inf_status); |
b89667eb | 918 | |
52557533 AC |
919 | /* FIXME: Insert a bunch of wrap_here; name can be very |
920 | long if it's a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 921 | error (_("\ |
04714b91 AC |
922 | The program being debugged was signaled while in a function called from GDB.\n\ |
923 | GDB remains in the frame where the signal was received.\n\ | |
2e74121d | 924 | To change this behavior use \"set unwindonsignal on\".\n\ |
b89667eb DE |
925 | Evaluation of the expression containing the function\n\ |
926 | (%s) will be abandoned.\n\ | |
927 | When the function is done executing, GDB will silently stop."), | |
52557533 AC |
928 | name); |
929 | } | |
930 | } | |
04714b91 | 931 | |
52557533 AC |
932 | if (!stop_stack_dummy) |
933 | { | |
7cd1089b PM |
934 | |
935 | /* Check if unwind on terminating exception behaviour is on. */ | |
936 | if (unwind_on_terminating_exception_p) | |
937 | { | |
938 | /* Check that the breakpoint is our special std::terminate | |
939 | breakpoint. If it is, we do not want to kill the inferior | |
940 | in an inferior function call. Rewind, and warn the | |
941 | user. */ | |
942 | ||
943 | if (terminate_bp != NULL | |
88e3b899 | 944 | && (inferior_thread ()->stop_bpstat->breakpoint_at->address |
7cd1089b PM |
945 | == terminate_bp->loc->address)) |
946 | { | |
947 | /* We must get back to the frame we were before the | |
948 | dummy call. */ | |
949 | dummy_frame_pop (dummy_id); | |
950 | ||
951 | /* We also need to restore inferior status to that before the | |
952 | dummy call. */ | |
953 | restore_inferior_status (inf_status); | |
954 | ||
955 | error (_("\ | |
956 | The program being debugged entered a std::terminate call, most likely\n\ | |
957 | caused by an unhandled C++ exception. GDB blocked this call in order\n\ | |
958 | to prevent the program from being terminated, and has restored the\n\ | |
959 | context to its original state before the call.\n\ | |
960 | To change this behaviour use \"set unwind-on-terminating-exception off\".\n\ | |
961 | Evaluation of the expression containing the function (%s)\n\ | |
962 | will be abandoned."), | |
963 | name); | |
964 | } | |
965 | } | |
b89667eb DE |
966 | /* We hit a breakpoint inside the FUNCTION. |
967 | Keep the dummy frame, the user may want to examine its state. | |
968 | Discard inferior status, we're not at the same point | |
969 | we started at. */ | |
52557533 | 970 | discard_inferior_status (inf_status); |
b89667eb | 971 | |
52557533 AC |
972 | /* The following error message used to say "The expression |
973 | which contained the function call has been discarded." | |
974 | It is a hard concept to explain in a few words. Ideally, | |
975 | GDB would be able to resume evaluation of the expression | |
976 | when the function finally is done executing. Perhaps | |
977 | someday this will be implemented (it would not be easy). */ | |
978 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
979 | a C++ name with arguments and stuff. */ | |
8a3fe4f8 | 980 | error (_("\ |
04714b91 | 981 | The program being debugged stopped while in a function called from GDB.\n\ |
b89667eb DE |
982 | Evaluation of the expression containing the function\n\ |
983 | (%s) will be abandoned.\n\ | |
984 | When the function is done executing, GDB will silently stop."), | |
985 | name); | |
52557533 AC |
986 | } |
987 | ||
988 | /* The above code errors out, so ... */ | |
e2e0b3e5 | 989 | internal_error (__FILE__, __LINE__, _("... should not be here")); |
52557533 | 990 | } |
04714b91 | 991 | |
2f2da8f6 PM |
992 | /* If we get here and the std::terminate() breakpoint has been set, |
993 | it has to be cleaned manually. */ | |
994 | if (terminate_bp) | |
995 | do_cleanups (terminate_bp_cleanup); | |
996 | ||
b89667eb DE |
997 | /* If we get here the called FUNCTION ran to completion, |
998 | and the dummy frame has already been popped. */ | |
74cfe982 | 999 | |
44e5158b | 1000 | { |
b89667eb DE |
1001 | struct regcache *retbuf = regcache_xmalloc (gdbarch); |
1002 | struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); | |
1a4d7a36 MK |
1003 | struct value *retval = NULL; |
1004 | ||
b89667eb DE |
1005 | regcache_cpy_no_passthrough (retbuf, stop_registers); |
1006 | ||
1007 | /* Inferior call is successful. Restore the inferior status. | |
1008 | At this stage, leave the RETBUF alone. */ | |
1009 | restore_inferior_status (inf_status); | |
1010 | ||
1011 | /* Figure out the value returned by the function. */ | |
1012 | ||
41f1b697 DJ |
1013 | if (lang_struct_return) |
1014 | retval = value_at (values_type, struct_addr); | |
1015 | else if (TYPE_CODE (target_values_type) == TYPE_CODE_VOID) | |
44e5158b | 1016 | { |
1a4d7a36 MK |
1017 | /* If the function returns void, don't bother fetching the |
1018 | return value. */ | |
df407dfe | 1019 | retval = allocate_value (values_type); |
44e5158b | 1020 | } |
1a4d7a36 MK |
1021 | else |
1022 | { | |
c055b101 CV |
1023 | switch (gdbarch_return_value (gdbarch, value_type (function), |
1024 | target_values_type, NULL, NULL, NULL)) | |
1a4d7a36 MK |
1025 | { |
1026 | case RETURN_VALUE_REGISTER_CONVENTION: | |
1027 | case RETURN_VALUE_ABI_RETURNS_ADDRESS: | |
1028 | case RETURN_VALUE_ABI_PRESERVES_ADDRESS: | |
1029 | retval = allocate_value (values_type); | |
c055b101 CV |
1030 | gdbarch_return_value (gdbarch, value_type (function), values_type, |
1031 | retbuf, value_contents_raw (retval), NULL); | |
1a4d7a36 MK |
1032 | break; |
1033 | case RETURN_VALUE_STRUCT_CONVENTION: | |
1034 | retval = value_at (values_type, struct_addr); | |
1035 | break; | |
1036 | } | |
1037 | } | |
1038 | ||
44e5158b | 1039 | do_cleanups (retbuf_cleanup); |
1a4d7a36 | 1040 | |
b89667eb | 1041 | gdb_assert (retval); |
44e5158b AC |
1042 | return retval; |
1043 | } | |
04714b91 | 1044 | } |
1a4d7a36 | 1045 | \f |
04714b91 | 1046 | |
1a4d7a36 | 1047 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
04714b91 AC |
1048 | void _initialize_infcall (void); |
1049 | ||
1050 | void | |
1051 | _initialize_infcall (void) | |
1052 | { | |
1053 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
7915a72c AC |
1054 | &coerce_float_to_double_p, _("\ |
1055 | Set coercion of floats to doubles when calling functions."), _("\ | |
1056 | Show coercion of floats to doubles when calling functions"), _("\ | |
04714b91 AC |
1057 | Variables of type float should generally be converted to doubles before\n\ |
1058 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
1059 | function. However, some older debug info formats do not provide enough\n\ | |
1060 | information to determine that a function is prototyped. If this flag is\n\ | |
1061 | set, GDB will perform the conversion for a function it considers\n\ | |
1062 | unprototyped.\n\ | |
7915a72c | 1063 | The default is to perform the conversion.\n"), |
2c5b56ce | 1064 | NULL, |
920d2a44 | 1065 | show_coerce_float_to_double_p, |
2c5b56ce | 1066 | &setlist, &showlist); |
04714b91 AC |
1067 | |
1068 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
7915a72c AC |
1069 | &unwind_on_signal_p, _("\ |
1070 | Set unwinding of stack if a signal is received while in a call dummy."), _("\ | |
1071 | Show unwinding of stack if a signal is received while in a call dummy."), _("\ | |
04714b91 AC |
1072 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
1073 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
1074 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
7915a72c | 1075 | The default is to stop in the frame where the signal was received."), |
2c5b56ce | 1076 | NULL, |
920d2a44 | 1077 | show_unwind_on_signal_p, |
2c5b56ce | 1078 | &setlist, &showlist); |
7cd1089b PM |
1079 | |
1080 | add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class, | |
1081 | &unwind_on_terminating_exception_p, _("\ | |
1082 | Set unwinding of stack if std::terminate is called while in call dummy."), _("\ | |
1083 | Show unwinding of stack if std::terminate() is called while in a call dummy."), _("\ | |
1084 | The unwind on terminating exception flag lets the user determine\n\ | |
1085 | what gdb should do if a std::terminate() call is made from the\n\ | |
1086 | default exception handler. If set, gdb unwinds the stack and restores\n\ | |
1087 | the context to what it was before the call. If unset, gdb allows the\n\ | |
1088 | std::terminate call to proceed.\n\ | |
1089 | The default is to unwind the frame."), | |
1090 | NULL, | |
1091 | show_unwind_on_terminating_exception_p, | |
1092 | &setlist, &showlist); | |
1093 | ||
04714b91 | 1094 | } |