254 lines
6.8 KiB
C
254 lines
6.8 KiB
C
/* Exception (throw catch) mechanism, for GDB, the GNU debugger.
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Copyright (C) 1986-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "exceptions.h"
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#include "breakpoint.h"
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#include "target.h"
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#include "inferior.h"
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#include "annotate.h"
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#include "ui-out.h"
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#include "serial.h"
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#include "gdbthread.h"
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const struct gdb_exception exception_none = { 0, GDB_NO_ERROR, NULL };
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void
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prepare_to_throw_exception (void)
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{
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clear_quit_flag ();
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immediate_quit = 0;
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}
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static void
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print_flush (void)
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{
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struct serial *gdb_stdout_serial;
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if (deprecated_error_begin_hook)
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deprecated_error_begin_hook ();
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if (target_supports_terminal_ours ())
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target_terminal_ours ();
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/* We want all output to appear now, before we print the error. We
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have 3 levels of buffering we have to flush (it's possible that
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some of these should be changed to flush the lower-level ones
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too): */
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/* 1. The _filtered buffer. */
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if (filtered_printing_initialized ())
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wrap_here ("");
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/* 2. The stdio buffer. */
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gdb_flush (gdb_stdout);
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gdb_flush (gdb_stderr);
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/* 3. The system-level buffer. */
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gdb_stdout_serial = serial_fdopen (1);
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if (gdb_stdout_serial)
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{
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serial_drain_output (gdb_stdout_serial);
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serial_un_fdopen (gdb_stdout_serial);
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}
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annotate_error_begin ();
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}
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static void
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print_exception (struct ui_file *file, struct gdb_exception e)
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{
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/* KLUGE: cagney/2005-01-13: Write the string out one line at a time
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as that way the MI's behavior is preserved. */
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const char *start;
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const char *end;
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for (start = e.message; start != NULL; start = end)
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{
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end = strchr (start, '\n');
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if (end == NULL)
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fputs_filtered (start, file);
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else
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{
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end++;
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ui_file_write (file, start, end - start);
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}
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}
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fprintf_filtered (file, "\n");
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/* Now append the annotation. */
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switch (e.reason)
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{
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case RETURN_QUIT:
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annotate_quit ();
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break;
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case RETURN_ERROR:
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/* Assume that these are all errors. */
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annotate_error ();
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break;
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default:
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internal_error (__FILE__, __LINE__, _("Bad switch."));
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}
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}
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void
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exception_print (struct ui_file *file, struct gdb_exception e)
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{
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if (e.reason < 0 && e.message != NULL)
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{
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print_flush ();
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print_exception (file, e);
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}
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}
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void
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exception_fprintf (struct ui_file *file, struct gdb_exception e,
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const char *prefix, ...)
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{
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if (e.reason < 0 && e.message != NULL)
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{
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va_list args;
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print_flush ();
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/* Print the prefix. */
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va_start (args, prefix);
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vfprintf_filtered (file, prefix, args);
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va_end (args);
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print_exception (file, e);
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}
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}
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/* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception
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handler. If an exception (enum return_reason) is thrown using
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throw_exception() than all cleanups installed since
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catch_exceptions() was entered are invoked, the (-ve) exception
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value is then returned by catch_exceptions. If FUNC() returns
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normally (with a positive or zero return value) then that value is
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returned by catch_exceptions(). It is an internal_error() for
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FUNC() to return a negative value.
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See exceptions.h for further usage details.
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Must not be called with immediate_quit in effect (bad things might
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happen, say we got a signal in the middle of a memcpy to quit_return).
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This is an OK restriction; with very few exceptions immediate_quit can
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be replaced by judicious use of QUIT. */
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/* MAYBE: cagney/1999-11-05: catch_errors() in conjunction with
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error() et al. could maintain a set of flags that indicate the
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current state of each of the longjmp buffers. This would give the
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longjmp code the chance to detect a longjmp botch (before it gets
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to longjmperror()). Prior to 1999-11-05 this wasn't possible as
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code also randomly used a SET_TOP_LEVEL macro that directly
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initialized the longjmp buffers. */
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int
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catch_exceptions (struct ui_out *uiout,
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catch_exceptions_ftype *func,
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void *func_args,
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return_mask mask)
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{
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return catch_exceptions_with_msg (uiout, func, func_args, NULL, mask);
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}
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int
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catch_exceptions_with_msg (struct ui_out *func_uiout,
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catch_exceptions_ftype *func,
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void *func_args,
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char **gdberrmsg,
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return_mask mask)
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{
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volatile struct gdb_exception exception;
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volatile int val = 0;
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struct ui_out *saved_uiout;
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/* Save and override the global ``struct ui_out'' builder. */
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saved_uiout = current_uiout;
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current_uiout = func_uiout;
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TRY_CATCH (exception, RETURN_MASK_ALL)
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{
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val = (*func) (current_uiout, func_args);
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}
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/* Restore the global builder. */
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current_uiout = saved_uiout;
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if (exception.reason < 0 && (mask & RETURN_MASK (exception.reason)) == 0)
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{
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/* The caller didn't request that the event be caught.
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Rethrow. */
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throw_exception (exception);
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}
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exception_print (gdb_stderr, exception);
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gdb_assert (val >= 0);
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gdb_assert (exception.reason <= 0);
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if (exception.reason < 0)
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{
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/* If caller wants a copy of the low-level error message, make
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one. This is used in the case of a silent error whereby the
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caller may optionally want to issue the message. */
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if (gdberrmsg != NULL)
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{
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if (exception.message != NULL)
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*gdberrmsg = xstrdup (exception.message);
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else
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*gdberrmsg = NULL;
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}
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return exception.reason;
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}
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return val;
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}
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/* This function is superseded by catch_exceptions(). */
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int
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catch_errors (catch_errors_ftype *func, void *func_args, char *errstring,
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return_mask mask)
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{
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volatile int val = 0;
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volatile struct gdb_exception exception;
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struct ui_out *saved_uiout;
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/* Save the global ``struct ui_out'' builder. */
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saved_uiout = current_uiout;
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TRY_CATCH (exception, RETURN_MASK_ALL)
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{
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val = func (func_args);
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}
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/* Restore the global builder. */
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current_uiout = saved_uiout;
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if (exception.reason < 0 && (mask & RETURN_MASK (exception.reason)) == 0)
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{
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/* The caller didn't request that the event be caught.
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Rethrow. */
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throw_exception (exception);
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}
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exception_fprintf (gdb_stderr, exception, "%s", errstring);
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if (exception.reason != 0)
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return 0;
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return val;
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}
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