| /* Exception (throw catch) mechanism, for GDB, the GNU debugger. |
| |
| Copyright (C) 1986-2017 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "exceptions.h" |
| #include "breakpoint.h" |
| #include "target.h" |
| #include "inferior.h" |
| #include "annotate.h" |
| #include "ui-out.h" |
| #include "serial.h" |
| #include "gdbthread.h" |
| #include "top.h" |
| |
| static void |
| print_flush (void) |
| { |
| struct ui *ui = current_ui; |
| struct serial *gdb_stdout_serial; |
| struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
| |
| if (deprecated_error_begin_hook) |
| deprecated_error_begin_hook (); |
| |
| if (target_supports_terminal_ours ()) |
| { |
| make_cleanup_restore_target_terminal (); |
| target_terminal_ours_for_output (); |
| } |
| |
| /* We want all output to appear now, before we print the error. We |
| have 3 levels of buffering we have to flush (it's possible that |
| some of these should be changed to flush the lower-level ones |
| too): */ |
| |
| /* 1. The _filtered buffer. */ |
| if (filtered_printing_initialized ()) |
| wrap_here (""); |
| |
| /* 2. The stdio buffer. */ |
| gdb_flush (gdb_stdout); |
| gdb_flush (gdb_stderr); |
| |
| /* 3. The system-level buffer. */ |
| gdb_stdout_serial = serial_fdopen (fileno (ui->outstream)); |
| if (gdb_stdout_serial) |
| { |
| serial_drain_output (gdb_stdout_serial); |
| serial_un_fdopen (gdb_stdout_serial); |
| } |
| |
| annotate_error_begin (); |
| |
| do_cleanups (old_chain); |
| } |
| |
| static void |
| print_exception (struct ui_file *file, struct gdb_exception e) |
| { |
| /* KLUGE: cagney/2005-01-13: Write the string out one line at a time |
| as that way the MI's behavior is preserved. */ |
| const char *start; |
| const char *end; |
| |
| for (start = e.message; start != NULL; start = end) |
| { |
| end = strchr (start, '\n'); |
| if (end == NULL) |
| fputs_filtered (start, file); |
| else |
| { |
| end++; |
| ui_file_write (file, start, end - start); |
| } |
| } |
| fprintf_filtered (file, "\n"); |
| |
| /* Now append the annotation. */ |
| switch (e.reason) |
| { |
| case RETURN_QUIT: |
| annotate_quit (); |
| break; |
| case RETURN_ERROR: |
| /* Assume that these are all errors. */ |
| annotate_error (); |
| break; |
| default: |
| internal_error (__FILE__, __LINE__, _("Bad switch.")); |
| } |
| } |
| |
| void |
| exception_print (struct ui_file *file, struct gdb_exception e) |
| { |
| if (e.reason < 0 && e.message != NULL) |
| { |
| print_flush (); |
| print_exception (file, e); |
| } |
| } |
| |
| void |
| exception_fprintf (struct ui_file *file, struct gdb_exception e, |
| const char *prefix, ...) |
| { |
| if (e.reason < 0 && e.message != NULL) |
| { |
| va_list args; |
| |
| print_flush (); |
| |
| /* Print the prefix. */ |
| va_start (args, prefix); |
| vfprintf_filtered (file, prefix, args); |
| va_end (args); |
| |
| print_exception (file, e); |
| } |
| } |
| |
| /* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception |
| handler. If an exception (enum return_reason) is thrown using |
| throw_exception() than all cleanups installed since |
| catch_exceptions() was entered are invoked, the (-ve) exception |
| value is then returned by catch_exceptions. If FUNC() returns |
| normally (with a positive or zero return value) then that value is |
| returned by catch_exceptions(). It is an internal_error() for |
| FUNC() to return a negative value. |
| |
| See exceptions.h for further usage details. */ |
| |
| /* MAYBE: cagney/1999-11-05: catch_errors() in conjunction with |
| error() et al. could maintain a set of flags that indicate 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 |
| initialized the longjmp buffers. */ |
| |
| int |
| catch_exceptions (struct ui_out *uiout, |
| catch_exceptions_ftype *func, |
| void *func_args, |
| return_mask mask) |
| { |
| return catch_exceptions_with_msg (uiout, func, func_args, NULL, mask); |
| } |
| |
| int |
| catch_exceptions_with_msg (struct ui_out *func_uiout, |
| catch_exceptions_ftype *func, |
| void *func_args, |
| char **gdberrmsg, |
| return_mask mask) |
| { |
| struct gdb_exception exception = exception_none; |
| volatile int val = 0; |
| struct ui_out *saved_uiout; |
| |
| /* Save and override the global ``struct ui_out'' builder. */ |
| saved_uiout = current_uiout; |
| current_uiout = func_uiout; |
| |
| TRY |
| { |
| val = (*func) (current_uiout, func_args); |
| } |
| CATCH (ex, RETURN_MASK_ALL) |
| { |
| exception = ex; |
| } |
| END_CATCH |
| |
| /* Restore the global builder. */ |
| current_uiout = saved_uiout; |
| |
| if (exception.reason < 0 && (mask & RETURN_MASK (exception.reason)) == 0) |
| { |
| /* The caller didn't request that the event be caught. |
| Rethrow. */ |
| throw_exception (exception); |
| } |
| |
| exception_print (gdb_stderr, exception); |
| gdb_assert (val >= 0); |
| gdb_assert (exception.reason <= 0); |
| if (exception.reason < 0) |
| { |
| /* If caller wants a copy of the low-level error message, make |
| one. This is used in the case of a silent error whereby the |
| caller may optionally want to issue the message. */ |
| if (gdberrmsg != NULL) |
| { |
| if (exception.message != NULL) |
| *gdberrmsg = xstrdup (exception.message); |
| else |
| *gdberrmsg = NULL; |
| } |
| return exception.reason; |
| } |
| return val; |
| } |
| |
| /* This function is superseded by catch_exceptions(). */ |
| |
| int |
| catch_errors (catch_errors_ftype *func, void *func_args, char *errstring, |
| return_mask mask) |
| { |
| struct gdb_exception exception = exception_none; |
| volatile int val = 0; |
| struct ui_out *saved_uiout; |
| |
| /* Save the global ``struct ui_out'' builder. */ |
| saved_uiout = current_uiout; |
| |
| TRY |
| { |
| val = func (func_args); |
| } |
| CATCH (ex, RETURN_MASK_ALL) |
| { |
| exception = ex; |
| } |
| END_CATCH |
| |
| /* Restore the global builder. */ |
| current_uiout = saved_uiout; |
| |
| if (exception.reason < 0 && (mask & RETURN_MASK (exception.reason)) == 0) |
| { |
| /* The caller didn't request that the event be caught. |
| Rethrow. */ |
| throw_exception (exception); |
| } |
| |
| exception_fprintf (gdb_stderr, exception, "%s", errstring); |
| if (exception.reason != 0) |
| return 0; |
| return val; |
| } |
| |
| /* See exceptions.h. */ |
| |
| int |
| exception_print_same (struct gdb_exception e1, struct gdb_exception e2) |
| { |
| const char *msg1 = e1.message; |
| const char *msg2 = e2.message; |
| |
| if (msg1 == NULL) |
| msg1 = ""; |
| if (msg2 == NULL) |
| msg2 = ""; |
| |
| return (e1.reason == e2.reason |
| && e1.error == e2.error |
| && strcmp (msg1, msg2) == 0); |
| } |