1 /* Perform an inferior function call, for GDB, the GNU debugger.
3 Copyright (C) 1986-2023 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "breakpoint.h"
23 #include "tracepoint.h"
34 #include "dummy-frame.h"
37 #include "gdbthread.h"
38 #include "event-top.h"
39 #include "observable.h"
42 #include "thread-fsm.h"
44 #include "gdbsupport/scope-exit.h"
47 /* True if we are debugging inferior calls. */
49 static bool debug_infcall = false;
51 /* Print an "infcall" debug statement. */
53 #define infcall_debug_printf(fmt, ...) \
54 debug_prefixed_printf_cond (debug_infcall, "infcall", fmt, ##__VA_ARGS__)
56 /* Print "infcall" enter/exit debug statements. */
58 #define INFCALL_SCOPED_DEBUG_ENTER_EXIT \
59 scoped_debug_enter_exit (debug_infcall, "infcall")
61 /* Print "infcall" start/end debug statements. */
63 #define INFCALL_SCOPED_DEBUG_START_END(fmt, ...) \
64 scoped_debug_start_end (debug_infrun, "infcall", fmt, ##__VA_ARGS__)
66 /* Implement 'show debug infcall'. */
69 show_debug_infcall (struct ui_file *file, int from_tty,
70 struct cmd_list_element *c, const char *value)
72 gdb_printf (file, _("Inferior call debugging is %s.\n"), value);
75 /* If we can't find a function's name from its address,
76 we print this instead. */
77 #define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s"
78 #define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \
79 + 2 * sizeof (CORE_ADDR))
81 /* NOTE: cagney/2003-04-16: What's the future of this code?
83 GDB needs an asynchronous expression evaluator, that means an
84 asynchronous inferior function call implementation, and that in
85 turn means restructuring the code so that it is event driven. */
87 static bool may_call_functions_p = true;
89 show_may_call_functions_p (struct ui_file *file, int from_tty,
90 struct cmd_list_element *c,
94 _("Permission to call functions in the program is %s.\n"),
98 /* How you should pass arguments to a function depends on whether it
99 was defined in K&R style or prototype style. If you define a
100 function using the K&R syntax that takes a `float' argument, then
101 callers must pass that argument as a `double'. If you define the
102 function using the prototype syntax, then you must pass the
103 argument as a `float', with no promotion.
105 Unfortunately, on certain older platforms, the debug info doesn't
106 indicate reliably how each function was defined. A function type's
107 TYPE_PROTOTYPED flag may be clear, even if the function was defined
108 in prototype style. When calling a function whose TYPE_PROTOTYPED
109 flag is clear, GDB consults this flag to decide what to do.
111 For modern targets, it is proper to assume that, if the prototype
112 flag is clear, that can be trusted: `float' arguments should be
113 promoted to `double'. For some older targets, if the prototype
114 flag is clear, that doesn't tell us anything. The default is to
115 trust the debug information; the user can override this behavior
116 with "set coerce-float-to-double 0". */
118 static bool coerce_float_to_double_p = true;
120 show_coerce_float_to_double_p (struct ui_file *file, int from_tty,
121 struct cmd_list_element *c, const char *value)
124 _("Coercion of floats to doubles "
125 "when calling functions is %s.\n"),
129 /* This boolean tells what gdb should do if a signal is received while
130 in a function called from gdb (call dummy). If set, gdb unwinds
131 the stack and restore the context to what as it was before the
134 The default is to stop in the frame where the signal was received. */
136 static bool unwind_on_signal_p = false;
138 show_unwind_on_signal_p (struct ui_file *file, int from_tty,
139 struct cmd_list_element *c, const char *value)
142 _("Unwinding of stack if a signal is "
143 "received while in a call dummy is %s.\n"),
147 /* This boolean tells what gdb should do if a std::terminate call is
148 made while in a function called from gdb (call dummy).
149 As the confines of a single dummy stack prohibit out-of-frame
150 handlers from handling a raised exception, and as out-of-frame
151 handlers are common in C++, this can lead to no handler being found
152 by the unwinder, and a std::terminate call. This is a false positive.
153 If set, gdb unwinds the stack and restores the context to what it
156 The default is to unwind the frame if a std::terminate call is
159 static bool unwind_on_terminating_exception_p = true;
162 show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty,
163 struct cmd_list_element *c,
168 _("Unwind stack if a C++ exception is "
169 "unhandled while in a call dummy is %s.\n"),
173 /* Perform the standard coercions that are specified
174 for arguments to be passed to C, Ada or Fortran functions.
176 If PARAM_TYPE is non-NULL, it is the expected parameter type.
177 IS_PROTOTYPED is non-zero if the function declaration is prototyped. */
179 static struct value *
180 value_arg_coerce (struct gdbarch *gdbarch, struct value *arg,
181 struct type *param_type, int is_prototyped)
183 const struct builtin_type *builtin = builtin_type (gdbarch);
184 struct type *arg_type = check_typedef (value_type (arg));
186 = param_type ? check_typedef (param_type) : arg_type;
188 /* Perform any Ada- and Fortran-specific coercion first. */
189 if (current_language->la_language == language_ada)
190 arg = ada_convert_actual (arg, type);
191 else if (current_language->la_language == language_fortran)
192 type = fortran_preserve_arg_pointer (arg, type);
194 /* Force the value to the target if we will need its address. At
195 this point, we could allocate arguments on the stack instead of
196 calling malloc if we knew that their addresses would not be
197 saved by the called function. */
198 arg = value_coerce_to_target (arg);
200 switch (type->code ())
203 case TYPE_CODE_RVALUE_REF:
205 struct value *new_value;
207 if (TYPE_IS_REFERENCE (arg_type))
208 return value_cast_pointers (type, arg, 0);
210 /* Cast the value to the reference's target type, and then
211 convert it back to a reference. This will issue an error
212 if the value was not previously in memory - in some cases
213 we should clearly be allowing this, but how? */
214 new_value = value_cast (type->target_type (), arg);
215 new_value = value_ref (new_value, type->code ());
222 /* If we don't have a prototype, coerce to integer type if necessary. */
225 if (type->length () < builtin->builtin_int->length ())
226 type = builtin->builtin_int;
228 /* Currently all target ABIs require at least the width of an integer
229 type for an argument. We may have to conditionalize the following
230 type coercion for future targets. */
231 if (type->length () < builtin->builtin_int->length ())
232 type = builtin->builtin_int;
235 if (!is_prototyped && coerce_float_to_double_p)
237 if (type->length () < builtin->builtin_double->length ())
238 type = builtin->builtin_double;
239 else if (type->length () > builtin->builtin_double->length ())
240 type = builtin->builtin_long_double;
244 type = lookup_pointer_type (type);
246 case TYPE_CODE_ARRAY:
247 /* Arrays are coerced to pointers to their first element, unless
248 they are vectors, in which case we want to leave them alone,
249 because they are passed by value. */
250 if (current_language->c_style_arrays_p ())
251 if (!type->is_vector ())
252 type = lookup_pointer_type (type->target_type ());
254 case TYPE_CODE_UNDEF:
256 case TYPE_CODE_STRUCT:
257 case TYPE_CODE_UNION:
260 case TYPE_CODE_RANGE:
261 case TYPE_CODE_STRING:
262 case TYPE_CODE_ERROR:
263 case TYPE_CODE_MEMBERPTR:
264 case TYPE_CODE_METHODPTR:
265 case TYPE_CODE_METHOD:
266 case TYPE_CODE_COMPLEX:
271 return value_cast (type, arg);
277 find_function_addr (struct value *function,
278 struct type **retval_type,
279 struct type **function_type)
281 struct type *ftype = check_typedef (value_type (function));
282 struct gdbarch *gdbarch = ftype->arch ();
283 struct type *value_type = NULL;
284 /* Initialize it just to avoid a GCC false warning. */
285 CORE_ADDR funaddr = 0;
287 /* If it's a member function, just look at the function
290 /* Determine address to call. */
291 if (ftype->code () == TYPE_CODE_FUNC
292 || ftype->code () == TYPE_CODE_METHOD)
293 funaddr = value_address (function);
294 else if (ftype->code () == TYPE_CODE_PTR)
296 funaddr = value_as_address (function);
297 ftype = check_typedef (ftype->target_type ());
298 if (ftype->code () == TYPE_CODE_FUNC
299 || ftype->code () == TYPE_CODE_METHOD)
300 funaddr = gdbarch_convert_from_func_ptr_addr
301 (gdbarch, funaddr, current_inferior ()->top_target());
303 if (ftype->code () == TYPE_CODE_FUNC
304 || ftype->code () == TYPE_CODE_METHOD)
306 if (ftype->is_gnu_ifunc ())
308 CORE_ADDR resolver_addr = funaddr;
310 /* Resolve the ifunc. Note this may call the resolver
311 function in the inferior. */
312 funaddr = gnu_ifunc_resolve_addr (gdbarch, resolver_addr);
314 /* Skip querying the function symbol if no RETVAL_TYPE or
315 FUNCTION_TYPE have been asked for. */
316 if (retval_type != NULL || function_type != NULL)
318 type *target_ftype = find_function_type (funaddr);
319 /* If we don't have debug info for the target function,
320 see if we can instead extract the target function's
321 type from the type that the resolver returns. */
322 if (target_ftype == NULL)
323 target_ftype = find_gnu_ifunc_target_type (resolver_addr);
324 if (target_ftype != NULL)
326 value_type = check_typedef (target_ftype)->target_type ();
327 ftype = target_ftype;
332 value_type = ftype->target_type ();
334 else if (ftype->code () == TYPE_CODE_INT)
336 /* Handle the case of functions lacking debugging info.
337 Their values are characters since their addresses are char. */
338 if (ftype->length () == 1)
339 funaddr = value_as_address (value_addr (function));
342 /* Handle function descriptors lacking debug info. */
343 int found_descriptor = 0;
345 funaddr = 0; /* pacify "gcc -Werror" */
346 if (VALUE_LVAL (function) == lval_memory)
350 funaddr = value_as_address (value_addr (function));
352 funaddr = gdbarch_convert_from_func_ptr_addr
353 (gdbarch, funaddr, current_inferior ()->top_target ());
354 if (funaddr != nfunaddr)
355 found_descriptor = 1;
357 if (!found_descriptor)
358 /* Handle integer used as address of a function. */
359 funaddr = (CORE_ADDR) value_as_long (function);
363 error (_("Invalid data type for function to be called."));
365 if (retval_type != NULL)
366 *retval_type = value_type;
367 if (function_type != NULL)
368 *function_type = ftype;
369 return funaddr + gdbarch_deprecated_function_start_offset (gdbarch);
372 /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called
373 function returns to. */
376 push_dummy_code (struct gdbarch *gdbarch,
377 CORE_ADDR sp, CORE_ADDR funaddr,
378 gdb::array_view<value *> args,
379 struct type *value_type,
380 CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
381 struct regcache *regcache)
383 gdb_assert (gdbarch_push_dummy_code_p (gdbarch));
385 return gdbarch_push_dummy_code (gdbarch, sp, funaddr,
386 args.data (), args.size (),
387 value_type, real_pc, bp_addr,
394 error_call_unknown_return_type (const char *func_name)
396 if (func_name != NULL)
397 error (_("'%s' has unknown return type; "
398 "cast the call to its declared return type"),
401 error (_("function has unknown return type; "
402 "cast the call to its declared return type"));
405 /* Fetch the name of the function at FUNADDR.
406 This is used in printing an error message for call_function_by_hand.
407 BUF is used to print FUNADDR in hex if the function name cannot be
408 determined. It must be large enough to hold formatted result of
409 RAW_FUNCTION_ADDRESS_FORMAT. */
412 get_function_name (CORE_ADDR funaddr, char *buf, int buf_size)
415 struct symbol *symbol = find_pc_function (funaddr);
418 return symbol->print_name ();
422 /* Try the minimal symbols. */
423 struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr);
426 return msymbol.minsym->print_name ();
430 std::string tmp = string_printf (_(RAW_FUNCTION_ADDRESS_FORMAT),
431 hex_string (funaddr));
433 gdb_assert (tmp.length () + 1 <= buf_size);
434 return strcpy (buf, tmp.c_str ());
438 /* All the meta data necessary to extract the call's return value. */
440 struct call_return_meta_info
442 /* The caller frame's architecture. */
443 struct gdbarch *gdbarch;
445 /* The called function. */
446 struct value *function;
448 /* The return value's type. */
449 struct type *value_type;
451 /* Are we returning a value using a structure return or a normal
455 /* If using a structure return, this is the structure's address. */
456 CORE_ADDR struct_addr;
459 /* Extract the called function's return value. */
461 static struct value *
462 get_call_return_value (struct call_return_meta_info *ri)
464 struct value *retval = NULL;
465 thread_info *thr = inferior_thread ();
466 bool stack_temporaries = thread_stack_temporaries_enabled_p (thr);
468 if (ri->value_type->code () == TYPE_CODE_VOID)
469 retval = allocate_value (ri->value_type);
470 else if (ri->struct_return_p)
472 if (stack_temporaries)
474 retval = value_from_contents_and_address (ri->value_type, NULL,
476 push_thread_stack_temporary (thr, retval);
480 retval = allocate_value (ri->value_type);
481 read_value_memory (retval, 0, 1, ri->struct_addr,
482 value_contents_raw (retval).data (),
483 ri->value_type->length ());
488 retval = allocate_value (ri->value_type);
489 gdbarch_return_value (ri->gdbarch, ri->function, ri->value_type,
490 get_current_regcache (),
491 value_contents_raw (retval).data (), NULL);
492 if (stack_temporaries && class_or_union_p (ri->value_type))
494 /* Values of class type returned in registers are copied onto
495 the stack and their lval_type set to lval_memory. This is
496 required because further evaluation of the expression
497 could potentially invoke methods on the return value
498 requiring GDB to evaluate the "this" pointer. To evaluate
499 the this pointer, GDB needs the memory address of the
501 value_force_lval (retval, ri->struct_addr);
502 push_thread_stack_temporary (thr, retval);
506 gdb_assert (retval != NULL);
510 /* Data for the FSM that manages an infcall. It's main job is to
511 record the called function's return value. */
513 struct call_thread_fsm : public thread_fsm
515 /* All the info necessary to be able to extract the return
517 struct call_return_meta_info return_meta_info;
519 /* The called function's return value. This is extracted from the
520 target before the dummy frame is popped. */
521 struct value *return_value = nullptr;
523 /* The top level that started the infcall (and is synchronously
524 waiting for it to end). */
525 struct ui *waiting_ui;
527 call_thread_fsm (struct ui *waiting_ui, struct interp *cmd_interp,
528 struct gdbarch *gdbarch, struct value *function,
529 struct type *value_type,
530 int struct_return_p, CORE_ADDR struct_addr);
532 bool should_stop (struct thread_info *thread) override;
534 bool should_notify_stop () override;
537 /* Allocate a new call_thread_fsm object. */
539 call_thread_fsm::call_thread_fsm (struct ui *waiting_ui,
540 struct interp *cmd_interp,
541 struct gdbarch *gdbarch,
542 struct value *function,
543 struct type *value_type,
544 int struct_return_p, CORE_ADDR struct_addr)
545 : thread_fsm (cmd_interp),
546 waiting_ui (waiting_ui)
548 return_meta_info.gdbarch = gdbarch;
549 return_meta_info.function = function;
550 return_meta_info.value_type = value_type;
551 return_meta_info.struct_return_p = struct_return_p;
552 return_meta_info.struct_addr = struct_addr;
555 /* Implementation of should_stop method for infcalls. */
558 call_thread_fsm::should_stop (struct thread_info *thread)
560 INFCALL_SCOPED_DEBUG_ENTER_EXIT;
562 if (stop_stack_dummy == STOP_STACK_DUMMY)
567 /* Stash the return value before the dummy frame is popped and
568 registers are restored to what they were before the
570 return_value = get_call_return_value (&return_meta_info);
572 /* Break out of wait_sync_command_done. */
573 scoped_restore save_ui = make_scoped_restore (¤t_ui, waiting_ui);
574 target_terminal::ours ();
575 waiting_ui->prompt_state = PROMPT_NEEDED;
581 /* Implementation of should_notify_stop method for infcalls. */
584 call_thread_fsm::should_notify_stop ()
588 /* Infcall succeeded. Be silent and proceed with evaluating the
593 /* Something wrong happened. E.g., an unexpected breakpoint
594 triggered, or a signal was intercepted. Notify the stop. */
598 /* Subroutine of call_function_by_hand to simplify it.
599 Start up the inferior and wait for it to stop.
600 Return the exception if there's an error, or an exception with
601 reason >= 0 if there's no error.
603 This is done inside a TRY_CATCH so the caller needn't worry about
604 thrown errors. The caller should rethrow if there's an error. */
606 static struct gdb_exception
607 run_inferior_call (std::unique_ptr<call_thread_fsm> sm,
608 struct thread_info *call_thread, CORE_ADDR real_pc)
610 INFCALL_SCOPED_DEBUG_ENTER_EXIT;
612 struct gdb_exception caught_error;
613 ptid_t call_thread_ptid = call_thread->ptid;
614 int was_running = call_thread->state == THREAD_RUNNING;
616 infcall_debug_printf ("call function at %s in thread %s, was_running = %d",
617 core_addr_to_string (real_pc),
618 call_thread_ptid.to_string ().c_str (),
621 current_ui->unregister_file_handler ();
623 scoped_restore restore_in_infcall
624 = make_scoped_restore (&call_thread->control.in_infcall, 1);
626 clear_proceed_status (0);
628 /* Associate the FSM with the thread after clear_proceed_status
629 (otherwise it'd clear this FSM). */
630 call_thread->set_thread_fsm (std::move (sm));
632 disable_watchpoints_before_interactive_call_start ();
634 /* We want to print return value, please... */
635 call_thread->control.proceed_to_finish = 1;
639 /* Infcalls run synchronously, in the foreground. */
640 scoped_restore restore_prompt_state
641 = make_scoped_restore (¤t_ui->prompt_state, PROMPT_BLOCKED);
643 /* So that we don't print the prompt prematurely in
644 fetch_inferior_event. */
645 scoped_restore restore_ui_async
646 = make_scoped_restore (¤t_ui->async, 0);
648 proceed (real_pc, GDB_SIGNAL_0);
650 infrun_debug_show_threads ("non-exited threads after proceed for inferior-call",
651 all_non_exited_threads ());
653 /* Inferior function calls are always synchronous, even if the
654 target supports asynchronous execution. */
655 wait_sync_command_done ();
657 infcall_debug_printf ("inferior call completed successfully");
659 catch (gdb_exception &e)
661 infcall_debug_printf ("exception while making inferior call (%d): %s",
662 e.reason, e.what ());
663 caught_error = std::move (e);
666 infcall_debug_printf ("thread is now: %s",
667 inferior_ptid.to_string ().c_str ());
669 /* If GDB has the prompt blocked before, then ensure that it remains
670 so. normal_stop calls async_enable_stdin, so reset the prompt
671 state again here. In other cases, stdin will be re-enabled by
672 inferior_event_handler, when an exception is thrown. */
673 if (current_ui->prompt_state == PROMPT_BLOCKED)
674 current_ui->unregister_file_handler ();
676 current_ui->register_file_handler ();
678 /* If the infcall does NOT succeed, normal_stop will have already
679 finished the thread states. However, on success, normal_stop
680 defers here, so that we can set back the thread states to what
681 they were before the call. Note that we must also finish the
682 state of new threads that might have spawned while the call was
683 running. The main cases to handle are:
685 - "(gdb) print foo ()", or any other command that evaluates an
686 expression at the prompt. (The thread was marked stopped before.)
688 - "(gdb) break foo if return_false()" or similar cases where we
689 do an infcall while handling an event (while the thread is still
690 marked running). In this example, whether the condition
691 evaluates true and thus we'll present a user-visible stop is
692 decided elsewhere. */
694 && call_thread_ptid == inferior_ptid
695 && stop_stack_dummy == STOP_STACK_DUMMY)
696 finish_thread_state (call_thread->inf->process_target (),
697 user_visible_resume_ptid (0));
699 enable_watchpoints_after_interactive_call_stop ();
701 /* Call breakpoint_auto_delete on the current contents of the bpstat
702 of inferior call thread.
703 If all error()s out of proceed ended up calling normal_stop
704 (and perhaps they should; it already does in the special case
705 of error out of resume()), then we wouldn't need this. */
706 if (caught_error.reason < 0)
708 if (call_thread->state != THREAD_EXITED)
709 breakpoint_auto_delete (call_thread->control.stop_bpstat);
715 /* Reserve space on the stack for a value of the given type.
716 Return the address of the allocated space.
717 Make certain that the value is correctly aligned.
718 The SP argument is modified. */
721 reserve_stack_space (const type *values_type, CORE_ADDR &sp)
723 frame_info_ptr frame = get_current_frame ();
724 struct gdbarch *gdbarch = get_frame_arch (frame);
727 if (gdbarch_inner_than (gdbarch, 1, 2))
729 /* Stack grows downward. Align STRUCT_ADDR and SP after
731 sp -= values_type->length ();
732 if (gdbarch_frame_align_p (gdbarch))
733 sp = gdbarch_frame_align (gdbarch, sp);
738 /* Stack grows upward. Align the frame, allocate space, and
739 then again, re-align the frame??? */
740 if (gdbarch_frame_align_p (gdbarch))
741 sp = gdbarch_frame_align (gdbarch, sp);
743 sp += values_type->length ();
744 if (gdbarch_frame_align_p (gdbarch))
745 sp = gdbarch_frame_align (gdbarch, sp);
751 /* The data structure which keeps a destructor function and
752 its implicit 'this' parameter. */
754 struct destructor_info
756 destructor_info (struct value *function, struct value *self)
757 : function (function), self (self) { }
759 struct value *function;
764 /* Auxiliary function that takes a list of destructor functions
765 with their 'this' parameters, and invokes the functions. */
768 call_destructors (const std::list<destructor_info> &dtors_to_invoke,
769 struct type *default_return_type)
771 for (auto vals : dtors_to_invoke)
773 call_function_by_hand (vals.function, default_return_type,
774 gdb::make_array_view (&(vals.self), 1));
781 call_function_by_hand (struct value *function,
782 type *default_return_type,
783 gdb::array_view<value *> args)
785 return call_function_by_hand_dummy (function, default_return_type,
789 /* All this stuff with a dummy frame may seem unnecessarily complicated
790 (why not just save registers in GDB?). The purpose of pushing a dummy
791 frame which looks just like a real frame is so that if you call a
792 function and then hit a breakpoint (get a signal, etc), "backtrace"
793 will look right. Whether the backtrace needs to actually show the
794 stack at the time the inferior function was called is debatable, but
795 it certainly needs to not display garbage. So if you are contemplating
796 making dummy frames be different from normal frames, consider that. */
798 /* Perform a function call in the inferior.
799 ARGS is a vector of values of arguments.
800 FUNCTION is a value, the function to be called.
801 Returns a value representing what the function returned.
802 May fail to return, if a breakpoint or signal is hit
803 during the execution of the function.
805 ARGS is modified to contain coerced values. */
808 call_function_by_hand_dummy (struct value *function,
809 type *default_return_type,
810 gdb::array_view<value *> args,
811 dummy_frame_dtor_ftype *dummy_dtor,
812 void *dummy_dtor_data)
814 INFCALL_SCOPED_DEBUG_ENTER_EXIT;
817 struct type *target_values_type;
818 function_call_return_method return_method = return_method_normal;
819 CORE_ADDR struct_addr = 0;
822 struct frame_id dummy_id;
823 frame_info_ptr frame;
824 struct gdbarch *gdbarch;
825 ptid_t call_thread_ptid;
826 struct gdb_exception e;
827 char name_buf[RAW_FUNCTION_ADDRESS_SIZE];
829 if (!may_call_functions_p)
830 error (_("Cannot call functions in the program: "
831 "may-call-functions is off."));
833 if (!target_has_execution ())
836 if (get_traceframe_number () >= 0)
837 error (_("May not call functions while looking at trace frames."));
839 if (execution_direction == EXEC_REVERSE)
840 error (_("Cannot call functions in reverse mode."));
842 /* We're going to run the target, and inspect the thread's state
843 afterwards. Hold a strong reference so that the pointer remains
844 valid even if the thread exits. */
845 thread_info_ref call_thread
846 = thread_info_ref::new_reference (inferior_thread ());
848 bool stack_temporaries = thread_stack_temporaries_enabled_p (call_thread.get ());
850 frame = get_current_frame ();
851 frame.prepare_reinflate ();
852 gdbarch = get_frame_arch (frame);
854 if (!gdbarch_push_dummy_call_p (gdbarch))
855 error (_("This target does not support function calls."));
857 /* Find the function type and do a sanity check. */
860 CORE_ADDR funaddr = find_function_addr (function, &values_type, &ftype);
862 if (is_nocall_function (ftype))
863 error (_("Cannot call the function '%s' which does not follow the "
864 "target calling convention."),
865 get_function_name (funaddr, name_buf, sizeof (name_buf)));
869 if (values_type == NULL || values_type->is_stub ())
870 values_type = default_return_type;
871 if (values_type == NULL)
873 const char *name = get_function_name (funaddr,
874 name_buf, sizeof (name_buf));
875 error (_("'%s' has unknown return type; "
876 "cast the call to its declared return type"),
880 values_type = check_typedef (values_type);
882 if (args.size () < ftype->num_fields ())
883 error (_("Too few arguments in function call."));
885 infcall_debug_printf ("calling %s", get_function_name (funaddr, name_buf,
888 /* A holder for the inferior status.
889 This is only needed while we're preparing the inferior function call. */
890 infcall_control_state_up inf_status (save_infcall_control_state ());
892 /* Save the caller's registers and other state associated with the
893 inferior itself so that they can be restored once the
894 callee returns. To allow nested calls the registers are (further
895 down) pushed onto a dummy frame stack. This unique pointer
896 is released once the regcache has been pushed). */
897 infcall_suspend_state_up caller_state (save_infcall_suspend_state ());
899 /* Ensure that the initial SP is correctly aligned. */
901 CORE_ADDR old_sp = get_frame_sp (frame);
903 if (gdbarch_frame_align_p (gdbarch))
905 sp = gdbarch_frame_align (gdbarch, old_sp);
906 /* NOTE: cagney/2003-08-13: Skip the "red zone". For some
907 ABIs, a function can use memory beyond the inner most stack
908 address. AMD64 called that region the "red zone". Skip at
909 least the "red zone" size before allocating any space on
911 if (gdbarch_inner_than (gdbarch, 1, 2))
912 sp -= gdbarch_frame_red_zone_size (gdbarch);
914 sp += gdbarch_frame_red_zone_size (gdbarch);
916 gdb_assert (sp == gdbarch_frame_align (gdbarch, sp));
917 /* NOTE: cagney/2002-09-18:
919 On a RISC architecture, a void parameterless generic dummy
920 frame (i.e., no parameters, no result) typically does not
921 need to push anything the stack and hence can leave SP and
922 FP. Similarly, a frameless (possibly leaf) function does
923 not push anything on the stack and, hence, that too can
924 leave FP and SP unchanged. As a consequence, a sequence of
925 void parameterless generic dummy frame calls to frameless
926 functions will create a sequence of effectively identical
927 frames (SP, FP and TOS and PC the same). This, not
928 surprisingly, results in what appears to be a stack in an
929 infinite loop --- when GDB tries to find a generic dummy
930 frame on the internal dummy frame stack, it will always
933 To avoid this problem, the code below always grows the
934 stack. That way, two dummy frames can never be identical.
935 It does burn a few bytes of stack but that is a small price
939 if (gdbarch_inner_than (gdbarch, 1, 2))
940 /* Stack grows down. */
941 sp = gdbarch_frame_align (gdbarch, old_sp - 1);
943 /* Stack grows up. */
944 sp = gdbarch_frame_align (gdbarch, old_sp + 1);
946 /* SP may have underflown address zero here from OLD_SP. Memory access
947 functions will probably fail in such case but that is a target's
951 /* FIXME: cagney/2002-09-18: Hey, you loose!
953 Who knows how badly aligned the SP is!
955 If the generic dummy frame ends up empty (because nothing is
956 pushed) GDB won't be able to correctly perform back traces.
957 If a target is having trouble with backtraces, first thing to
958 do is add FRAME_ALIGN() to the architecture vector. If that
959 fails, try dummy_id().
961 If the ABI specifies a "Red Zone" (see the doco) the code
962 below will quietly trash it. */
965 /* Skip over the stack temporaries that might have been generated during
966 the evaluation of an expression. */
967 if (stack_temporaries)
969 struct value *lastval;
971 lastval = get_last_thread_stack_temporary (call_thread.get ());
974 CORE_ADDR lastval_addr = value_address (lastval);
976 if (gdbarch_inner_than (gdbarch, 1, 2))
978 gdb_assert (sp >= lastval_addr);
983 gdb_assert (sp <= lastval_addr);
984 sp = lastval_addr + value_type (lastval)->length ();
987 if (gdbarch_frame_align_p (gdbarch))
988 sp = gdbarch_frame_align (gdbarch, sp);
993 /* Are we returning a value using a structure return? */
995 if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type))
997 return_method = return_method_hidden_param;
999 /* Tell the target specific argument pushing routine not to
1001 target_values_type = builtin_type (gdbarch)->builtin_void;
1005 if (using_struct_return (gdbarch, function, values_type))
1006 return_method = return_method_struct;
1007 target_values_type = values_type;
1010 gdb::observers::inferior_call_pre.notify (inferior_ptid, funaddr);
1012 /* Determine the location of the breakpoint (and possibly other
1013 stuff) that the called function will return to. The SPARC, for a
1014 function returning a structure or union, needs to make space for
1015 not just the breakpoint but also an extra word containing the
1016 size (?) of the structure being passed. */
1018 switch (gdbarch_call_dummy_location (gdbarch))
1022 const gdb_byte *bp_bytes;
1023 CORE_ADDR bp_addr_as_address;
1026 /* Be careful BP_ADDR is in inferior PC encoding while
1027 BP_ADDR_AS_ADDRESS is a plain memory address. */
1029 sp = push_dummy_code (gdbarch, sp, funaddr, args,
1030 target_values_type, &real_pc, &bp_addr,
1031 get_current_regcache ());
1033 /* Write a legitimate instruction at the point where the infcall
1034 breakpoint is going to be inserted. While this instruction
1035 is never going to be executed, a user investigating the
1036 memory from GDB would see this instruction instead of random
1037 uninitialized bytes. We chose the breakpoint instruction
1038 as it may look as the most logical one to the user and also
1039 valgrind 3.7.0 needs it for proper vgdb inferior calls.
1041 If software breakpoints are unsupported for this target we
1042 leave the user visible memory content uninitialized. */
1044 bp_addr_as_address = bp_addr;
1045 bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address,
1047 if (bp_bytes != NULL)
1048 write_memory (bp_addr_as_address, bp_bytes, bp_size);
1051 case AT_ENTRY_POINT:
1053 CORE_ADDR dummy_addr;
1056 dummy_addr = entry_point_address ();
1058 /* A call dummy always consists of just a single breakpoint, so
1059 its address is the same as the address of the dummy.
1061 The actual breakpoint is inserted separatly so there is no need to
1063 bp_addr = dummy_addr;
1067 internal_error (_("bad switch"));
1070 /* Coerce the arguments and handle pass-by-reference.
1071 We want to remember the destruction required for pass-by-ref values.
1072 For these, store the dtor function and the 'this' argument
1073 in DTORS_TO_INVOKE. */
1074 std::list<destructor_info> dtors_to_invoke;
1076 for (int i = args.size () - 1; i >= 0; i--)
1079 struct type *param_type;
1081 /* FIXME drow/2002-05-31: Should just always mark methods as
1082 prototyped. Can we respect TYPE_VARARGS? Probably not. */
1083 if (ftype->code () == TYPE_CODE_METHOD)
1085 else if (ftype->target_type () == NULL && ftype->num_fields () == 0
1086 && default_return_type != NULL)
1088 /* Calling a no-debug function with the return type
1089 explicitly cast. Assume the function is prototyped,
1090 with a prototype matching the types of the arguments.
1092 float mult (float v1, float v2) { return v1 * v2; }
1094 (gdb) p (float) mult (2.0f, 3.0f)
1095 Is a simpler alternative to:
1096 (gdb) p ((float (*) (float, float)) mult) (2.0f, 3.0f)
1100 else if (i < ftype->num_fields ())
1101 prototyped = ftype->is_prototyped ();
1105 if (i < ftype->num_fields ())
1106 param_type = ftype->field (i).type ();
1110 value *original_arg = args[i];
1111 args[i] = value_arg_coerce (gdbarch, args[i],
1112 param_type, prototyped);
1114 if (param_type == NULL)
1117 auto info = language_pass_by_reference (param_type);
1118 if (!info.copy_constructible)
1119 error (_("expression cannot be evaluated because the type '%s' "
1120 "is not copy constructible"), param_type->name ());
1122 if (!info.destructible)
1123 error (_("expression cannot be evaluated because the type '%s' "
1124 "is not destructible"), param_type->name ());
1126 if (info.trivially_copyable)
1129 /* Make a copy of the argument on the stack. If the argument is
1130 trivially copy ctor'able, copy bit by bit. Otherwise, call
1131 the copy ctor to initialize the clone. */
1132 CORE_ADDR addr = reserve_stack_space (param_type, sp);
1134 = value_from_contents_and_address (param_type, nullptr, addr);
1135 push_thread_stack_temporary (call_thread.get (), clone);
1137 = value_from_pointer (lookup_pointer_type (param_type), addr);
1139 if (info.trivially_copy_constructible)
1141 int length = param_type->length ();
1142 write_memory (addr, value_contents (args[i]).data (), length);
1147 value *cctor_args[2] = { clone_ptr, original_arg };
1148 find_overload_match (gdb::make_array_view (cctor_args, 2),
1149 param_type->name (), METHOD,
1150 &clone_ptr, nullptr, ©_ctor, nullptr,
1151 nullptr, 0, EVAL_NORMAL);
1153 if (copy_ctor == nullptr)
1154 error (_("expression cannot be evaluated because a copy "
1155 "constructor for the type '%s' could not be found "
1156 "(maybe inlined?)"), param_type->name ());
1158 call_function_by_hand (copy_ctor, default_return_type,
1159 gdb::make_array_view (cctor_args, 2));
1162 /* If the argument has a destructor, remember it so that we
1163 invoke it after the infcall is complete. */
1164 if (!info.trivially_destructible)
1166 /* Looking up the function via overload resolution does not
1167 work because the compiler (in particular, gcc) adds an
1168 artificial int parameter in some cases. So we look up
1169 the function by using the "~" name. This should be OK
1170 because there can be only one dtor definition. */
1171 const char *dtor_name = nullptr;
1172 for (int fieldnum = 0;
1173 fieldnum < TYPE_NFN_FIELDS (param_type);
1177 = TYPE_FN_FIELDLIST1 (param_type, fieldnum);
1178 const char *field_name
1179 = TYPE_FN_FIELDLIST_NAME (param_type, fieldnum);
1181 if (field_name[0] == '~')
1182 dtor_name = TYPE_FN_FIELD_PHYSNAME (fn, 0);
1185 if (dtor_name == nullptr)
1186 error (_("expression cannot be evaluated because a destructor "
1187 "for the type '%s' could not be found "
1188 "(maybe inlined?)"), param_type->name ());
1191 = find_function_in_inferior (dtor_name, 0);
1193 /* Insert the dtor to the front of the list to call them
1194 in reverse order later. */
1195 dtors_to_invoke.emplace_front (dtor, clone_ptr);
1198 args[i] = clone_ptr;
1201 /* Reserve space for the return structure to be written on the
1202 stack, if necessary.
1204 While evaluating expressions, we reserve space on the stack for
1205 return values of class type even if the language ABI and the target
1206 ABI do not require that the return value be passed as a hidden first
1207 argument. This is because we want to store the return value as an
1208 on-stack temporary while the expression is being evaluated. This
1209 enables us to have chained function calls in expressions.
1211 Keeping the return values as on-stack temporaries while the expression
1212 is being evaluated is OK because the thread is stopped until the
1213 expression is completely evaluated. */
1215 if (return_method != return_method_normal
1216 || (stack_temporaries && class_or_union_p (values_type)))
1217 struct_addr = reserve_stack_space (values_type, sp);
1219 std::vector<struct value *> new_args;
1220 if (return_method == return_method_hidden_param)
1222 /* Add the new argument to the front of the argument list. */
1223 new_args.reserve (args.size ());
1225 (value_from_pointer (lookup_pointer_type (values_type), struct_addr));
1226 new_args.insert (new_args.end (), args.begin (), args.end ());
1230 /* Create the dummy stack frame. Pass in the call dummy address as,
1231 presumably, the ABI code knows where, in the call dummy, the
1232 return address should be pointed. */
1233 sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (),
1234 bp_addr, args.size (), args.data (),
1235 sp, return_method, struct_addr);
1237 /* Set up a frame ID for the dummy frame so we can pass it to
1238 set_momentary_breakpoint. We need to give the breakpoint a frame
1239 ID so that the breakpoint code can correctly re-identify the
1240 dummy breakpoint. */
1241 /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL,
1242 saved as the dummy-frame TOS, and used by dummy_id to form
1243 the frame ID's stack address. */
1244 dummy_id = frame_id_build (sp, bp_addr);
1246 /* Create a momentary breakpoint at the return address of the
1247 inferior. That way it breaks when it returns. */
1250 symtab_and_line sal;
1251 sal.pspace = current_program_space;
1253 sal.section = find_pc_overlay (sal.pc);
1255 /* Sanity. The exact same SP value is returned by
1256 PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by
1257 dummy_id to form the frame ID's stack address. */
1259 = set_momentary_breakpoint (gdbarch, sal,
1260 dummy_id, bp_call_dummy).release ();
1262 /* set_momentary_breakpoint invalidates FRAME. */
1265 bpt->disposition = disp_del;
1266 gdb_assert (bpt->related_breakpoint == bpt);
1268 breakpoint *longjmp_b = set_longjmp_breakpoint_for_call_dummy ();
1271 /* Link BPT into the chain of LONGJMP_B. */
1272 bpt->related_breakpoint = longjmp_b;
1273 while (longjmp_b->related_breakpoint != bpt->related_breakpoint)
1274 longjmp_b = longjmp_b->related_breakpoint;
1275 longjmp_b->related_breakpoint = bpt;
1279 /* Create a breakpoint in std::terminate.
1280 If a C++ exception is raised in the dummy-frame, and the
1281 exception handler is (normally, and expected to be) out-of-frame,
1282 the default C++ handler will (wrongly) be called in an inferior
1283 function call. This is wrong, as an exception can be normally
1284 and legally handled out-of-frame. The confines of the dummy frame
1285 prevent the unwinder from finding the correct handler (or any
1286 handler, unless it is in-frame). The default handler calls
1287 std::terminate. This will kill the inferior. Assert that
1288 terminate should never be called in an inferior function
1289 call. Place a momentary breakpoint in the std::terminate function
1290 and if triggered in the call, rewind. */
1291 if (unwind_on_terminating_exception_p)
1292 set_std_terminate_breakpoint ();
1294 /* Everything's ready, push all the info needed to restore the
1295 caller (and identify the dummy-frame) onto the dummy-frame
1297 dummy_frame_push (caller_state.release (), &dummy_id, call_thread.get ());
1298 if (dummy_dtor != NULL)
1299 register_dummy_frame_dtor (dummy_id, call_thread.get (),
1300 dummy_dtor, dummy_dtor_data);
1302 /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */
1303 SCOPE_EXIT { delete_std_terminate_breakpoint (); };
1305 /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP -
1306 If you're looking to implement asynchronous dummy-frames, then
1307 just below is the place to chop this function in two.. */
1310 /* Save the current FSM. We'll override it. */
1311 std::unique_ptr<thread_fsm> saved_sm = call_thread->release_thread_fsm ();
1312 struct call_thread_fsm *sm;
1314 /* Save this thread's ptid, we need it later but the thread
1316 call_thread_ptid = call_thread->ptid;
1318 /* Run the inferior until it stops. */
1320 /* Create the FSM used to manage the infcall. It tells infrun to
1321 not report the stop to the user, and captures the return value
1322 before the dummy frame is popped. run_inferior_call registers
1323 it with the thread ASAP. */
1324 sm = new call_thread_fsm (current_ui, command_interp (),
1327 return_method != return_method_normal,
1330 std::unique_ptr<call_thread_fsm> sm_up (sm);
1331 e = run_inferior_call (std::move (sm_up), call_thread.get (), real_pc);
1335 infcall_debug_printf ("after inferior call, exception (%d): %s",
1336 e.reason, e.what ());
1337 infcall_debug_printf ("after inferior call, thread state is: %s",
1338 thread_state_string (call_thread->state));
1340 gdb::observers::inferior_call_post.notify (call_thread_ptid, funaddr);
1342 if (call_thread->state != THREAD_EXITED)
1344 /* The FSM should still be the same. */
1345 gdb_assert (call_thread->thread_fsm () == sm);
1347 if (call_thread->thread_fsm ()->finished_p ())
1349 struct value *retval;
1351 infcall_debug_printf ("call completed");
1353 /* The inferior call is successful. Pop the dummy frame,
1354 which runs its destructors and restores the inferior's
1355 suspend state, and restore the inferior control
1357 dummy_frame_pop (dummy_id, call_thread.get ());
1358 restore_infcall_control_state (inf_status.release ());
1360 /* Get the return value. */
1361 retval = sm->return_value;
1363 /* Restore the original FSM and clean up / destroh the call FSM.
1364 Doing it in this order ensures that if the call to clean_up
1365 throws, the original FSM is properly restored. */
1367 std::unique_ptr<thread_fsm> finalizing
1368 = call_thread->release_thread_fsm ();
1369 call_thread->set_thread_fsm (std::move (saved_sm));
1371 finalizing->clean_up (call_thread.get ());
1374 maybe_remove_breakpoints ();
1376 gdb_assert (retval != NULL);
1378 /* Destruct the pass-by-ref argument clones. */
1379 call_destructors (dtors_to_invoke, default_return_type);
1384 infcall_debug_printf ("call did not complete");
1386 /* Didn't complete. Clean up / destroy the call FSM, and restore the
1387 previous state machine, and handle the error. */
1389 std::unique_ptr<thread_fsm> finalizing
1390 = call_thread->release_thread_fsm ();
1391 call_thread->set_thread_fsm (std::move (saved_sm));
1393 finalizing->clean_up (call_thread.get ());
1398 /* Rethrow an error if we got one trying to run the inferior. */
1402 const char *name = get_function_name (funaddr,
1403 name_buf, sizeof (name_buf));
1405 discard_infcall_control_state (inf_status.release ());
1407 /* We could discard the dummy frame here if the program exited,
1408 but it will get garbage collected the next time the program is
1414 throw_error (e.error, _("%s\n\
1415 An error occurred while in a function called from GDB.\n\
1416 Evaluation of the expression containing the function\n\
1417 (%s) will be abandoned.\n\
1418 When the function is done executing, GDB will silently stop."),
1422 throw_exception (std::move (e));
1426 /* If the program has exited, or we stopped at a different thread,
1427 exit and inform the user. */
1429 if (! target_has_execution ())
1431 const char *name = get_function_name (funaddr,
1432 name_buf, sizeof (name_buf));
1434 /* If we try to restore the inferior status,
1435 we'll crash as the inferior is no longer running. */
1436 discard_infcall_control_state (inf_status.release ());
1438 /* We could discard the dummy frame here given that the program exited,
1439 but it will get garbage collected the next time the program is
1442 error (_("The program being debugged exited while in a function "
1443 "called from GDB.\n"
1444 "Evaluation of the expression containing the function\n"
1445 "(%s) will be abandoned."),
1449 if (call_thread_ptid != inferior_ptid)
1451 const char *name = get_function_name (funaddr,
1452 name_buf, sizeof (name_buf));
1454 /* We've switched threads. This can happen if another thread gets a
1455 signal or breakpoint while our thread was running.
1456 There's no point in restoring the inferior status,
1457 we're in a different thread. */
1458 discard_infcall_control_state (inf_status.release ());
1459 /* Keep the dummy frame record, if the user switches back to the
1460 thread with the hand-call, we'll need it. */
1461 if (stopped_by_random_signal)
1463 The program received a signal in another thread while\n\
1464 making a function call from GDB.\n\
1465 Evaluation of the expression containing the function\n\
1466 (%s) will be abandoned.\n\
1467 When the function is done executing, GDB will silently stop."),
1471 The program stopped in another thread while making a function call from GDB.\n\
1472 Evaluation of the expression containing the function\n\
1473 (%s) will be abandoned.\n\
1474 When the function is done executing, GDB will silently stop."),
1479 /* Make a copy as NAME may be in an objfile freed by dummy_frame_pop. */
1480 std::string name = get_function_name (funaddr, name_buf,
1483 if (stopped_by_random_signal)
1485 /* We stopped inside the FUNCTION because of a random
1486 signal. Further execution of the FUNCTION is not
1489 if (unwind_on_signal_p)
1491 /* The user wants the context restored. */
1493 /* We must get back to the frame we were before the
1495 dummy_frame_pop (dummy_id, call_thread.get ());
1497 /* We also need to restore inferior status to that before the
1499 restore_infcall_control_state (inf_status.release ());
1501 /* FIXME: Insert a bunch of wrap_here; name can be very
1502 long if it's a C++ name with arguments and stuff. */
1504 The program being debugged was signaled while in a function called from GDB.\n\
1505 GDB has restored the context to what it was before the call.\n\
1506 To change this behavior use \"set unwindonsignal off\".\n\
1507 Evaluation of the expression containing the function\n\
1508 (%s) will be abandoned."),
1513 /* The user wants to stay in the frame where we stopped
1515 Discard inferior status, we're not at the same point
1517 discard_infcall_control_state (inf_status.release ());
1519 /* FIXME: Insert a bunch of wrap_here; name can be very
1520 long if it's a C++ name with arguments and stuff. */
1522 The program being debugged was signaled while in a function called from GDB.\n\
1523 GDB remains in the frame where the signal was received.\n\
1524 To change this behavior use \"set unwindonsignal on\".\n\
1525 Evaluation of the expression containing the function\n\
1526 (%s) will be abandoned.\n\
1527 When the function is done executing, GDB will silently stop."),
1532 if (stop_stack_dummy == STOP_STD_TERMINATE)
1534 /* We must get back to the frame we were before the dummy
1536 dummy_frame_pop (dummy_id, call_thread.get ());
1538 /* We also need to restore inferior status to that before
1540 restore_infcall_control_state (inf_status.release ());
1543 The program being debugged entered a std::terminate call, most likely\n\
1544 caused by an unhandled C++ exception. GDB blocked this call in order\n\
1545 to prevent the program from being terminated, and has restored the\n\
1546 context to its original state before the call.\n\
1547 To change this behaviour use \"set unwind-on-terminating-exception off\".\n\
1548 Evaluation of the expression containing the function (%s)\n\
1549 will be abandoned."),
1552 else if (stop_stack_dummy == STOP_NONE)
1555 /* We hit a breakpoint inside the FUNCTION.
1556 Keep the dummy frame, the user may want to examine its state.
1557 Discard inferior status, we're not at the same point
1559 discard_infcall_control_state (inf_status.release ());
1561 /* The following error message used to say "The expression
1562 which contained the function call has been discarded."
1563 It is a hard concept to explain in a few words. Ideally,
1564 GDB would be able to resume evaluation of the expression
1565 when the function finally is done executing. Perhaps
1566 someday this will be implemented (it would not be easy). */
1567 /* FIXME: Insert a bunch of wrap_here; name can be very long if it's
1568 a C++ name with arguments and stuff. */
1570 The program being debugged stopped while in a function called from GDB.\n\
1571 Evaluation of the expression containing the function\n\
1572 (%s) will be abandoned.\n\
1573 When the function is done executing, GDB will silently stop."),
1579 /* The above code errors out, so ... */
1580 gdb_assert_not_reached ("... should not be here");
1583 void _initialize_infcall ();
1585 _initialize_infcall ()
1587 add_setshow_boolean_cmd ("may-call-functions", no_class,
1588 &may_call_functions_p, _("\
1589 Set permission to call functions in the program."), _("\
1590 Show permission to call functions in the program."), _("\
1591 When this permission is on, GDB may call functions in the program.\n\
1592 Otherwise, any sort of attempt to call a function in the program\n\
1593 will result in an error."),
1595 show_may_call_functions_p,
1596 &setlist, &showlist);
1598 add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure,
1599 &coerce_float_to_double_p, _("\
1600 Set coercion of floats to doubles when calling functions."), _("\
1601 Show coercion of floats to doubles when calling functions."), _("\
1602 Variables of type float should generally be converted to doubles before\n\
1603 calling an unprototyped function, and left alone when calling a prototyped\n\
1604 function. However, some older debug info formats do not provide enough\n\
1605 information to determine that a function is prototyped. If this flag is\n\
1606 set, GDB will perform the conversion for a function it considers\n\
1608 The default is to perform the conversion."),
1610 show_coerce_float_to_double_p,
1611 &setlist, &showlist);
1613 add_setshow_boolean_cmd ("unwindonsignal", no_class,
1614 &unwind_on_signal_p, _("\
1615 Set unwinding of stack if a signal is received while in a call dummy."), _("\
1616 Show unwinding of stack if a signal is received while in a call dummy."), _("\
1617 The unwindonsignal lets the user determine what gdb should do if a signal\n\
1618 is received while in a function called from gdb (call dummy). If set, gdb\n\
1619 unwinds the stack and restore the context to what as it was before the call.\n\
1620 The default is to stop in the frame where the signal was received."),
1622 show_unwind_on_signal_p,
1623 &setlist, &showlist);
1625 add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class,
1626 &unwind_on_terminating_exception_p, _("\
1627 Set unwinding of stack if std::terminate is called while in call dummy."), _("\
1628 Show unwinding of stack if std::terminate() is called while in a call dummy."),
1630 The unwind on terminating exception flag lets the user determine\n\
1631 what gdb should do if a std::terminate() call is made from the\n\
1632 default exception handler. If set, gdb unwinds the stack and restores\n\
1633 the context to what it was before the call. If unset, gdb allows the\n\
1634 std::terminate call to proceed.\n\
1635 The default is to unwind the frame."),
1637 show_unwind_on_terminating_exception_p,
1638 &setlist, &showlist);
1640 add_setshow_boolean_cmd
1641 ("infcall", class_maintenance, &debug_infcall,
1642 _("Set inferior call debugging."),
1643 _("Show inferior call debugging."),
1644 _("When on, inferior function call specific debugging is enabled."),
1645 NULL, show_debug_infcall, &setdebuglist, &showdebuglist);