/* Reverse execution and reverse debugging.
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/* Reverse execution and reverse debugging.
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Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This file is part of GDB.
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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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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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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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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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(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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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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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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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "defs.h"
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#include "gdb_string.h"
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#include "gdb_string.h"
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#include "target.h"
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#include "target.h"
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#include "top.h"
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#include "top.h"
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#include "cli/cli-cmds.h"
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#include "cli/cli-cmds.h"
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#include "cli/cli-decode.h"
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#include "cli/cli-decode.h"
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#include "inferior.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "regcache.h"
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/* User interface:
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/* User interface:
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reverse-step, reverse-next etc. */
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reverse-step, reverse-next etc. */
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static void
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static void
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exec_direction_default (void *notused)
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exec_direction_default (void *notused)
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{
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{
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/* Return execution direction to default state. */
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/* Return execution direction to default state. */
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execution_direction = EXEC_FORWARD;
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execution_direction = EXEC_FORWARD;
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}
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}
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/* exec_reverse_once -- accepts an arbitrary gdb command (string),
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/* exec_reverse_once -- accepts an arbitrary gdb command (string),
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and executes it with exec-direction set to 'reverse'.
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and executes it with exec-direction set to 'reverse'.
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Used to implement reverse-next etc. commands. */
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Used to implement reverse-next etc. commands. */
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static void
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static void
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exec_reverse_once (char *cmd, char *args, int from_tty)
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exec_reverse_once (char *cmd, char *args, int from_tty)
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{
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{
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char *reverse_command;
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char *reverse_command;
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enum exec_direction_kind dir = execution_direction;
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enum exec_direction_kind dir = execution_direction;
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struct cleanup *old_chain;
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struct cleanup *old_chain;
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if (dir == EXEC_ERROR)
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if (dir == EXEC_ERROR)
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error (_("Target %s does not support this command."), target_shortname);
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error (_("Target %s does not support this command."), target_shortname);
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if (dir == EXEC_REVERSE)
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if (dir == EXEC_REVERSE)
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error (_("Already in reverse mode. Use '%s' or 'set exec-dir forward'."),
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error (_("Already in reverse mode. Use '%s' or 'set exec-dir forward'."),
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cmd);
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cmd);
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if (!target_can_execute_reverse)
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if (!target_can_execute_reverse)
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error (_("Target %s does not support this command."), target_shortname);
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error (_("Target %s does not support this command."), target_shortname);
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reverse_command = xstrprintf ("%s %s", cmd, args ? args : "");
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reverse_command = xstrprintf ("%s %s", cmd, args ? args : "");
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old_chain = make_cleanup (exec_direction_default, NULL);
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old_chain = make_cleanup (exec_direction_default, NULL);
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make_cleanup (xfree, reverse_command);
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make_cleanup (xfree, reverse_command);
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execution_direction = EXEC_REVERSE;
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execution_direction = EXEC_REVERSE;
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execute_command (reverse_command, from_tty);
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execute_command (reverse_command, from_tty);
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do_cleanups (old_chain);
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do_cleanups (old_chain);
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}
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}
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static void
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static void
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reverse_step (char *args, int from_tty)
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reverse_step (char *args, int from_tty)
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{
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{
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exec_reverse_once ("step", args, from_tty);
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exec_reverse_once ("step", args, from_tty);
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}
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}
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static void
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static void
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reverse_stepi (char *args, int from_tty)
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reverse_stepi (char *args, int from_tty)
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{
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{
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exec_reverse_once ("stepi", args, from_tty);
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exec_reverse_once ("stepi", args, from_tty);
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}
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}
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static void
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static void
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reverse_next (char *args, int from_tty)
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reverse_next (char *args, int from_tty)
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{
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{
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exec_reverse_once ("next", args, from_tty);
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exec_reverse_once ("next", args, from_tty);
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}
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}
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static void
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static void
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reverse_nexti (char *args, int from_tty)
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reverse_nexti (char *args, int from_tty)
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{
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{
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exec_reverse_once ("nexti", args, from_tty);
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exec_reverse_once ("nexti", args, from_tty);
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}
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}
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static void
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static void
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reverse_continue (char *args, int from_tty)
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reverse_continue (char *args, int from_tty)
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{
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{
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exec_reverse_once ("continue", args, from_tty);
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exec_reverse_once ("continue", args, from_tty);
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}
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}
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static void
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static void
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reverse_finish (char *args, int from_tty)
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reverse_finish (char *args, int from_tty)
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{
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{
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exec_reverse_once ("finish", args, from_tty);
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exec_reverse_once ("finish", args, from_tty);
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}
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}
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/* Data structures for a bookmark list. */
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/* Data structures for a bookmark list. */
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struct bookmark {
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struct bookmark {
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struct bookmark *next;
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struct bookmark *next;
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int number;
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int number;
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CORE_ADDR pc;
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CORE_ADDR pc;
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struct symtab_and_line sal;
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struct symtab_and_line sal;
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gdb_byte *opaque_data;
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gdb_byte *opaque_data;
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};
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};
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static struct bookmark *bookmark_chain;
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static struct bookmark *bookmark_chain;
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static int bookmark_count;
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static int bookmark_count;
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#define ALL_BOOKMARKS(B) for ((B) = bookmark_chain; (B); (B) = (B)->next)
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#define ALL_BOOKMARKS(B) for ((B) = bookmark_chain; (B); (B) = (B)->next)
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#define ALL_BOOKMARKS_SAFE(B,TMP) \
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#define ALL_BOOKMARKS_SAFE(B,TMP) \
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for ((B) = bookmark_chain; \
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for ((B) = bookmark_chain; \
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(B) ? ((TMP) = (B)->next, 1) : 0; \
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(B) ? ((TMP) = (B)->next, 1) : 0; \
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(B) = (TMP))
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(B) = (TMP))
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/* save_bookmark_command -- implement "bookmark" command.
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/* save_bookmark_command -- implement "bookmark" command.
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Call target method to get a bookmark identifier.
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Call target method to get a bookmark identifier.
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Insert bookmark identifier into list.
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Insert bookmark identifier into list.
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Identifier will be a malloc string (gdb_byte *).
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Identifier will be a malloc string (gdb_byte *).
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Up to us to free it as required. */
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Up to us to free it as required. */
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static void
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static void
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save_bookmark_command (char *args, int from_tty)
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save_bookmark_command (char *args, int from_tty)
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{
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{
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/* Get target's idea of a bookmark. */
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/* Get target's idea of a bookmark. */
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gdb_byte *bookmark_id = target_get_bookmark (args, from_tty);
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gdb_byte *bookmark_id = target_get_bookmark (args, from_tty);
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struct bookmark *b, *b1;
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struct bookmark *b, *b1;
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struct gdbarch *gdbarch = get_regcache_arch (get_current_regcache ());
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struct gdbarch *gdbarch = get_regcache_arch (get_current_regcache ());
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/* CR should not cause another identical bookmark. */
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/* CR should not cause another identical bookmark. */
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dont_repeat ();
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dont_repeat ();
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if (bookmark_id == NULL)
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if (bookmark_id == NULL)
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error (_("target_get_bookmark failed."));
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error (_("target_get_bookmark failed."));
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/* Set up a bookmark struct. */
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/* Set up a bookmark struct. */
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b = xcalloc (1, sizeof (struct bookmark));
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b = xcalloc (1, sizeof (struct bookmark));
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b->number = ++bookmark_count;
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b->number = ++bookmark_count;
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init_sal (&b->sal);
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init_sal (&b->sal);
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b->pc = regcache_read_pc (get_current_regcache ());
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b->pc = regcache_read_pc (get_current_regcache ());
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b->sal = find_pc_line (b->pc, 0);
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b->sal = find_pc_line (b->pc, 0);
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b->sal.pspace = get_frame_program_space (get_current_frame ());
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b->sal.pspace = get_frame_program_space (get_current_frame ());
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b->opaque_data = bookmark_id;
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b->opaque_data = bookmark_id;
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b->next = NULL;
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b->next = NULL;
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/* Add this bookmark to the end of the chain, so that a list
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/* Add this bookmark to the end of the chain, so that a list
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of bookmarks will come out in order of increasing numbers. */
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of bookmarks will come out in order of increasing numbers. */
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b1 = bookmark_chain;
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b1 = bookmark_chain;
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if (b1 == 0)
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if (b1 == 0)
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bookmark_chain = b;
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bookmark_chain = b;
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else
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else
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{
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{
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while (b1->next)
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while (b1->next)
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b1 = b1->next;
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b1 = b1->next;
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b1->next = b;
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b1->next = b;
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}
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}
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printf_filtered (_("Saved bookmark %d at %s\n"), b->number,
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printf_filtered (_("Saved bookmark %d at %s\n"), b->number,
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paddress (gdbarch, b->sal.pc));
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paddress (gdbarch, b->sal.pc));
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}
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}
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/* Implement "delete bookmark" command. */
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/* Implement "delete bookmark" command. */
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static int
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static int
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delete_one_bookmark (struct bookmark *b)
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delete_one_bookmark (struct bookmark *b)
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{
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{
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struct bookmark *b1;
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struct bookmark *b1;
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/* Special case, first item in list. */
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/* Special case, first item in list. */
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if (b == bookmark_chain)
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if (b == bookmark_chain)
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bookmark_chain = b->next;
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bookmark_chain = b->next;
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/* Find bookmark preceeding "marked" one, so we can unlink. */
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/* Find bookmark preceeding "marked" one, so we can unlink. */
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if (b)
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if (b)
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{
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{
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ALL_BOOKMARKS (b1)
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ALL_BOOKMARKS (b1)
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if (b1->next == b)
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if (b1->next == b)
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{
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{
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/* Found designated bookmark. Unlink and delete. */
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/* Found designated bookmark. Unlink and delete. */
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b1->next = b->next;
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b1->next = b->next;
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break;
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break;
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}
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}
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xfree (b->opaque_data);
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xfree (b->opaque_data);
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xfree (b);
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xfree (b);
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return 1; /* success */
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return 1; /* success */
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}
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}
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return 0; /* failure */
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return 0; /* failure */
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}
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}
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static void
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static void
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delete_all_bookmarks (void)
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delete_all_bookmarks (void)
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{
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{
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struct bookmark *b, *b1;
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struct bookmark *b, *b1;
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ALL_BOOKMARKS_SAFE (b, b1)
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ALL_BOOKMARKS_SAFE (b, b1)
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{
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{
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xfree (b->opaque_data);
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xfree (b->opaque_data);
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xfree (b);
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xfree (b);
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}
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}
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bookmark_chain = NULL;
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bookmark_chain = NULL;
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}
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}
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static void
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static void
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delete_bookmark_command (char *args, int from_tty)
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delete_bookmark_command (char *args, int from_tty)
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{
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{
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struct bookmark *b, *b1;
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struct bookmark *b, *b1;
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unsigned long num;
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unsigned long num;
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if (bookmark_chain == NULL)
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if (bookmark_chain == NULL)
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{
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{
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warning (_("No bookmarks."));
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warning (_("No bookmarks."));
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return;
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return;
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}
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}
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if (args == NULL || args[0] == '\0')
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if (args == NULL || args[0] == '\0')
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{
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{
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if (from_tty && !query (_("Delete all bookmarks? ")))
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if (from_tty && !query (_("Delete all bookmarks? ")))
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return;
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return;
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delete_all_bookmarks ();
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delete_all_bookmarks ();
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return;
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return;
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}
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}
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num = strtoul (args, NULL, 0);
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num = strtoul (args, NULL, 0);
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/* Find bookmark with corresponding number. */
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/* Find bookmark with corresponding number. */
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ALL_BOOKMARKS (b)
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ALL_BOOKMARKS (b)
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if (b->number == num)
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if (b->number == num)
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break;
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break;
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if (!delete_one_bookmark (b))
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if (!delete_one_bookmark (b))
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/* Not found. */
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/* Not found. */
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error (_("delete bookmark: no bookmark found for '%s'."), args);
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error (_("delete bookmark: no bookmark found for '%s'."), args);
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}
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}
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/* Implement "goto-bookmark" command. */
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/* Implement "goto-bookmark" command. */
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static void
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static void
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goto_bookmark_command (char *args, int from_tty)
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goto_bookmark_command (char *args, int from_tty)
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{
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{
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struct bookmark *b;
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struct bookmark *b;
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unsigned long num;
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unsigned long num;
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if (args == NULL || args[0] == '\0')
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if (args == NULL || args[0] == '\0')
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error (_("Command requires an argument."));
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error (_("Command requires an argument."));
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if (strncmp (args, "start", strlen ("start")) == 0
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if (strncmp (args, "start", strlen ("start")) == 0
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|| strncmp (args, "begin", strlen ("begin")) == 0
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|| strncmp (args, "begin", strlen ("begin")) == 0
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|| strncmp (args, "end", strlen ("end")) == 0)
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|| strncmp (args, "end", strlen ("end")) == 0)
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{
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{
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/* Special case. Give target opportunity to handle. */
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/* Special case. Give target opportunity to handle. */
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target_goto_bookmark (args, from_tty);
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target_goto_bookmark (args, from_tty);
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return;
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return;
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}
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}
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if (args[0] == '\'' || args[0] == '\"')
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if (args[0] == '\'' || args[0] == '\"')
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{
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{
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/* Special case -- quoted string. Pass on to target. */
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/* Special case -- quoted string. Pass on to target. */
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if (args[strlen (args) - 1] != args[0])
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if (args[strlen (args) - 1] != args[0])
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error (_("Unbalanced quotes: %s"), args);
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error (_("Unbalanced quotes: %s"), args);
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target_goto_bookmark (args, from_tty);
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target_goto_bookmark (args, from_tty);
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return;
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return;
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}
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}
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/* General case. Bookmark identified by bookmark number. */
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/* General case. Bookmark identified by bookmark number. */
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num = strtoul (args, NULL, 0);
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num = strtoul (args, NULL, 0);
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ALL_BOOKMARKS (b)
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ALL_BOOKMARKS (b)
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if (b->number == num)
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if (b->number == num)
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break;
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break;
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if (b)
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if (b)
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{
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{
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/* Found. Send to target method. */
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/* Found. Send to target method. */
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target_goto_bookmark (b->opaque_data, from_tty);
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target_goto_bookmark (b->opaque_data, from_tty);
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return;
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return;
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}
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}
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/* Not found. */
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/* Not found. */
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error (_("goto-bookmark: no bookmark found for '%s'."), args);
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error (_("goto-bookmark: no bookmark found for '%s'."), args);
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}
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}
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/* Implement "info bookmarks" command. */
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/* Implement "info bookmarks" command. */
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static void
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static void
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bookmarks_info (char *args, int from_tty)
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bookmarks_info (char *args, int from_tty)
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{
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{
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struct bookmark *b;
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struct bookmark *b;
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int bnum = -1;
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int bnum = -1;
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struct gdbarch *gdbarch;
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struct gdbarch *gdbarch;
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if (args)
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if (args)
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bnum = parse_and_eval_long (args);
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bnum = parse_and_eval_long (args);
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if (!bookmark_chain)
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if (!bookmark_chain)
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{
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{
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printf_filtered (_("No bookmarks.\n"));
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printf_filtered (_("No bookmarks.\n"));
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return;
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return;
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}
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}
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gdbarch = get_regcache_arch (get_current_regcache ());
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gdbarch = get_regcache_arch (get_current_regcache ());
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printf_filtered (_("Bookmark Address Opaque\n"));
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printf_filtered (_("Bookmark Address Opaque\n"));
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printf_filtered (_(" ID Data \n"));
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printf_filtered (_(" ID Data \n"));
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ALL_BOOKMARKS (b)
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ALL_BOOKMARKS (b)
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printf_filtered (" %d %s '%s'\n",
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printf_filtered (" %d %s '%s'\n",
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b->number,
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b->number,
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paddress (gdbarch, b->pc),
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paddress (gdbarch, b->pc),
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b->opaque_data);
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b->opaque_data);
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}
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_reverse;
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extern initialize_file_ftype _initialize_reverse;
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|
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void
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void
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_initialize_reverse (void)
|
_initialize_reverse (void)
|
{
|
{
|
add_com ("reverse-step", class_run, reverse_step, _("\
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add_com ("reverse-step", class_run, reverse_step, _("\
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Step program backward until it reaches the beginning of another source line.\n\
|
Step program backward until it reaches the beginning of another source line.\n\
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Argument N means do this N times (or till program stops for another reason).")
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Argument N means do this N times (or till program stops for another reason).")
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);
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);
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add_com_alias ("rs", "reverse-step", class_alias, 1);
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add_com_alias ("rs", "reverse-step", class_alias, 1);
|
|
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add_com ("reverse-next", class_run, reverse_next, _("\
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add_com ("reverse-next", class_run, reverse_next, _("\
|
Step program backward, proceeding through subroutine calls.\n\
|
Step program backward, proceeding through subroutine calls.\n\
|
Like the \"reverse-step\" command as long as subroutine calls do not happen;\n\
|
Like the \"reverse-step\" command as long as subroutine calls do not happen;\n\
|
when they do, the call is treated as one instruction.\n\
|
when they do, the call is treated as one instruction.\n\
|
Argument N means do this N times (or till program stops for another reason).")
|
Argument N means do this N times (or till program stops for another reason).")
|
);
|
);
|
add_com_alias ("rn", "reverse-next", class_alias, 1);
|
add_com_alias ("rn", "reverse-next", class_alias, 1);
|
|
|
add_com ("reverse-stepi", class_run, reverse_stepi, _("\
|
add_com ("reverse-stepi", class_run, reverse_stepi, _("\
|
Step backward exactly one instruction.\n\
|
Step backward exactly one instruction.\n\
|
Argument N means do this N times (or till program stops for another reason).")
|
Argument N means do this N times (or till program stops for another reason).")
|
);
|
);
|
add_com_alias ("rsi", "reverse-stepi", class_alias, 0);
|
add_com_alias ("rsi", "reverse-stepi", class_alias, 0);
|
|
|
add_com ("reverse-nexti", class_run, reverse_nexti, _("\
|
add_com ("reverse-nexti", class_run, reverse_nexti, _("\
|
Step backward one instruction, but proceed through called subroutines.\n\
|
Step backward one instruction, but proceed through called subroutines.\n\
|
Argument N means do this N times (or till program stops for another reason).")
|
Argument N means do this N times (or till program stops for another reason).")
|
);
|
);
|
add_com_alias ("rni", "reverse-nexti", class_alias, 0);
|
add_com_alias ("rni", "reverse-nexti", class_alias, 0);
|
|
|
add_com ("reverse-continue", class_run, reverse_continue, _("\
|
add_com ("reverse-continue", class_run, reverse_continue, _("\
|
Continue program being debugged but run it in reverse.\n\
|
Continue program being debugged but run it in reverse.\n\
|
If proceeding from breakpoint, a number N may be used as an argument,\n\
|
If proceeding from breakpoint, a number N may be used as an argument,\n\
|
which means to set the ignore count of that breakpoint to N - 1 (so that\n\
|
which means to set the ignore count of that breakpoint to N - 1 (so that\n\
|
the breakpoint won't break until the Nth time it is reached)."));
|
the breakpoint won't break until the Nth time it is reached)."));
|
add_com_alias ("rc", "reverse-continue", class_alias, 0);
|
add_com_alias ("rc", "reverse-continue", class_alias, 0);
|
|
|
add_com ("reverse-finish", class_run, reverse_finish, _("\
|
add_com ("reverse-finish", class_run, reverse_finish, _("\
|
Execute backward until just before selected stack frame is called."));
|
Execute backward until just before selected stack frame is called."));
|
|
|
add_com ("bookmark", class_bookmark, save_bookmark_command, _("\
|
add_com ("bookmark", class_bookmark, save_bookmark_command, _("\
|
Set a bookmark in the program's execution history.\n\
|
Set a bookmark in the program's execution history.\n\
|
A bookmark represents a point in the execution history \n\
|
A bookmark represents a point in the execution history \n\
|
that can be returned to at a later point in the debug session."));
|
that can be returned to at a later point in the debug session."));
|
add_info ("bookmarks", bookmarks_info, _("\
|
add_info ("bookmarks", bookmarks_info, _("\
|
Status of user-settable bookmarks.\n\
|
Status of user-settable bookmarks.\n\
|
Bookmarks are user-settable markers representing a point in the \n\
|
Bookmarks are user-settable markers representing a point in the \n\
|
execution history that can be returned to later in the same debug \n\
|
execution history that can be returned to later in the same debug \n\
|
session."));
|
session."));
|
add_cmd ("bookmark", class_bookmark, delete_bookmark_command, _("\
|
add_cmd ("bookmark", class_bookmark, delete_bookmark_command, _("\
|
Delete a bookmark from the bookmark list.\n\
|
Delete a bookmark from the bookmark list.\n\
|
Argument is a bookmark number, or no argument to delete all bookmarks.\n"),
|
Argument is a bookmark number, or no argument to delete all bookmarks.\n"),
|
&deletelist);
|
&deletelist);
|
add_com ("goto-bookmark", class_bookmark, goto_bookmark_command, _("\
|
add_com ("goto-bookmark", class_bookmark, goto_bookmark_command, _("\
|
Go to an earlier-bookmarked point in the program's execution history.\n\
|
Go to an earlier-bookmarked point in the program's execution history.\n\
|
Argument is the bookmark number of a bookmark saved earlier by using \n\
|
Argument is the bookmark number of a bookmark saved earlier by using \n\
|
the 'bookmark' command, or the special arguments:\n\
|
the 'bookmark' command, or the special arguments:\n\
|
start (beginning of recording)\n\
|
start (beginning of recording)\n\
|
end (end of recording)\n"));
|
end (end of recording)\n"));
|
}
|
}
|
|
|
