-NORETURN void (*error_hook) (void) ATTR_NORETURN;
-\f
-
-/* One should use catch_errors rather than manipulating these
- directly. */
-#if defined(HAVE_SIGSETJMP)
-#define SIGJMP_BUF sigjmp_buf
-#define SIGSETJMP(buf) sigsetjmp((buf), 1)
-#define SIGLONGJMP(buf,val) siglongjmp((buf), (val))
-#else
-#define SIGJMP_BUF jmp_buf
-#define SIGSETJMP(buf) setjmp(buf)
-#define SIGLONGJMP(buf,val) longjmp((buf), (val))
-#endif
-
-/* Where to go for throw_exception(). */
-static SIGJMP_BUF *catch_return;
-
-/* Return for reason REASON to the nearest containing catch_errors(). */
-
-NORETURN void
-throw_exception (enum return_reason reason)
-{
- quit_flag = 0;
- immediate_quit = 0;
-
- /* Perhaps it would be cleaner to do this via the cleanup chain (not sure
- I can think of a reason why that is vital, though). */
- bpstat_clear_actions (stop_bpstat); /* Clear queued breakpoint commands */
-
- disable_current_display ();
- do_cleanups (ALL_CLEANUPS);
- if (event_loop_p && target_can_async_p () && !target_executing)
- do_exec_cleanups (ALL_CLEANUPS);
- if (event_loop_p && sync_execution)
- do_exec_error_cleanups (ALL_CLEANUPS);
-
- if (annotation_level > 1)
- switch (reason)
- {
- case RETURN_QUIT:
- annotate_quit ();
- break;
- case RETURN_ERROR:
- annotate_error ();
- break;
- }
-
- /* Jump to the containing catch_errors() call, communicating REASON
- to that call via setjmp's return value. Note that REASON can't
- be zero, by definition in defs.h. */
-
- (NORETURN void) SIGLONGJMP (*catch_return, (int) reason);
-}
-
-/* Call FUNC() with args FUNC_UIOUT and FUNC_ARGS, catching any
- errors. Set FUNC_CAUGHT to an ``enum return_reason'' if the
- function is aborted (using throw_exception() or zero if the
- function returns normally. Set FUNC_VAL to the value returned by
- the function or 0 if the function was aborted.
-
- Must not be called with immediate_quit in effect (bad things might
- happen, say we got a signal in the middle of a memcpy to quit_return).
- This is an OK restriction; with very few exceptions immediate_quit can
- be replaced by judicious use of QUIT.
-
- MASK specifies what to catch; it is normally set to
- RETURN_MASK_ALL, if for no other reason than that the code which
- calls catch_errors might not be set up to deal with a quit which
- isn't caught. But if the code can deal with it, it generally
- should be RETURN_MASK_ERROR, unless for some reason it is more
- useful to abort only the portion of the operation inside the
- catch_errors. Note that quit should return to the command line
- fairly quickly, even if some further processing is being done. */
-
-/* MAYBE: cagney/1999-11-05: catch_errors() in conjunction with
- error() et.al. could maintain a set of flags that indicate the the
- current state of each of the longjmp buffers. This would give the
- longjmp code the chance to detect a longjmp botch (before it gets
- to longjmperror()). Prior to 1999-11-05 this wasn't possible as
- code also randomly used a SET_TOP_LEVEL macro that directly
- initialize the longjmp buffers. */
-
-/* MAYBE: cagney/1999-11-05: Should the catch_errors and cleanups code
- be consolidated into a single file instead of being distributed
- between utils.c and top.c? */
-
-static void
-catcher (catch_exceptions_ftype *func,
- struct ui_out *func_uiout,
- void *func_args,
- int *func_val,
- enum return_reason *func_caught,
- char *errstring,
- return_mask mask)
-{
- SIGJMP_BUF *saved_catch;
- SIGJMP_BUF catch;
- struct cleanup *saved_cleanup_chain;
- char *saved_error_pre_print;
- char *saved_quit_pre_print;
- struct ui_out *saved_uiout;
-
- /* Return value from SIGSETJMP(): enum return_reason if error or
- quit caught, 0 otherwise. */
- int caught;
-
- /* Return value from FUNC(): Hopefully non-zero. Explicitly set to
- zero if an error quit was caught. */
- int val;
-
- /* Override error/quit messages during FUNC. */
-
- saved_error_pre_print = error_pre_print;
- saved_quit_pre_print = quit_pre_print;
-
- if (mask & RETURN_MASK_ERROR)
- error_pre_print = errstring;
- if (mask & RETURN_MASK_QUIT)
- quit_pre_print = errstring;
-
- /* Override the global ``struct ui_out'' builder. */
-
- saved_uiout = uiout;
- uiout = func_uiout;
-
- /* Prevent error/quit during FUNC from calling cleanups established
- prior to here. */
-
- saved_cleanup_chain = save_cleanups ();
-
- /* Call FUNC, catching error/quit events. */
-
- saved_catch = catch_return;
- catch_return = &catch;
- caught = SIGSETJMP (catch);
- if (!caught)
- val = (*func) (func_uiout, func_args);
- else
- val = 0;
- catch_return = saved_catch;
-
- /* FIXME: cagney/1999-11-05: A correct FUNC implementation will
- clean things up (restoring the cleanup chain) to the state they
- were just prior to the call. Unfortunately, many FUNC's are not
- that well behaved. This could be fixed by adding either a
- do_cleanups call (to cover the problem) or an assertion check to
- detect bad FUNCs code. */
-
- /* Restore the cleanup chain, the error/quit messages, and the uiout
- builder, to their original states. */
-
- restore_cleanups (saved_cleanup_chain);
-
- uiout = saved_uiout;
-
- if (mask & RETURN_MASK_QUIT)
- quit_pre_print = saved_quit_pre_print;
- if (mask & RETURN_MASK_ERROR)
- error_pre_print = saved_error_pre_print;
-
- /* Return normally if no error/quit event occurred or this catcher
- can handle this exception. The caller analyses the func return
- values. */
-
- if (!caught || (mask & RETURN_MASK (caught)))
- {
- *func_val = val;
- *func_caught = caught;
- return;
- }
-
- /* The caller didn't request that the event be caught, relay the
- event to the next containing catch_errors(). */
-
- throw_exception (caught);
-}
-
-int
-catch_exceptions (struct ui_out *uiout,
- catch_exceptions_ftype *func,
- void *func_args,
- char *errstring,
- return_mask mask)
-{
- int val;
- enum return_reason caught;
- catcher (func, uiout, func_args, &val, &caught, errstring, mask);
- gdb_assert (val >= 0);
- gdb_assert (caught <= 0);
- if (caught < 0)
- return caught;
- return val;
-}
-
-struct catch_errors_args
-{
- catch_errors_ftype *func;
- void *func_args;
-};
-
-int
-do_catch_errors (struct ui_out *uiout, void *data)
-{
- struct catch_errors_args *args = data;
- return args->func (args->func_args);
-}
-
-int
-catch_errors (catch_errors_ftype *func, void *func_args, char *errstring,
- return_mask mask)
-{
- int val;
- enum return_reason caught;
- struct catch_errors_args args;
- args.func = func;
- args.func_args = func_args;
- catcher (do_catch_errors, uiout, &args, &val, &caught, errstring, mask);
- if (caught != 0)
- return 0;
- return val;
-}
-
-struct captured_command_args
- {
- catch_command_errors_ftype *command;
- char *arg;
- int from_tty;
- };
-
-static int
-do_captured_command (void *data)
-{
- struct captured_command_args *context = data;
- context->command (context->arg, context->from_tty);
- /* FIXME: cagney/1999-11-07: Technically this do_cleanups() call
- isn't needed. Instead an assertion check could be made that
- simply confirmed that the called function correctly cleaned up
- after itself. Unfortunately, old code (prior to 1999-11-04) in
- main.c was calling SET_TOP_LEVEL(), calling the command function,
- and then *always* calling do_cleanups(). For the moment we
- remain ``bug compatible'' with that old code.. */
- do_cleanups (ALL_CLEANUPS);
- return 1;
-}
-
-int
-catch_command_errors (catch_command_errors_ftype * command,
- char *arg, int from_tty, return_mask mask)
-{
- struct captured_command_args args;
- args.command = command;
- args.arg = arg;
- args.from_tty = from_tty;
- return catch_errors (do_captured_command, &args, "", mask);
-}
-
projects / deliverable / binutils-gdb.git / blobdiff