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05374cfd90
This changes target_can_execute_reverse from an object-like macro to an inline function. gdb/ChangeLog 2020-09-28 Tom Tromey <tom@tromey.com> * mi/mi-main.c (exec_reverse_continue) (mi_cmd_list_target_features): Update. * infrun.c (set_exec_direction_func): Update. * target.c (default_execution_direction): Update. * reverse.c (exec_reverse_once): Update. * target.h (target_can_execute_reverse): Now a function.
386 lines
10 KiB
C
386 lines
10 KiB
C
/* Reverse execution and reverse debugging.
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Copyright (C) 2006-2020 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 "target.h"
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#include "top.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-utils.h"
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#include "inferior.h"
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#include "infrun.h"
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#include "regcache.h"
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/* User interface:
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reverse-step, reverse-next etc. */
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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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Used to implement reverse-next etc. commands. */
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static void
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exec_reverse_once (const char *cmd, const char *args, int from_tty)
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{
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enum exec_direction_kind dir = execution_direction;
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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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cmd);
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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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std::string reverse_command = string_printf ("%s %s", cmd, args ? args : "");
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scoped_restore restore_exec_dir
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= make_scoped_restore (&execution_direction, EXEC_REVERSE);
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execute_command (reverse_command.c_str (), from_tty);
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}
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static void
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reverse_step (const char *args, int from_tty)
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{
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exec_reverse_once ("step", args, from_tty);
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}
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static void
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reverse_stepi (const char *args, int from_tty)
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{
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exec_reverse_once ("stepi", args, from_tty);
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}
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static void
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reverse_next (const char *args, int from_tty)
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{
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exec_reverse_once ("next", args, from_tty);
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}
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static void
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reverse_nexti (const char *args, int from_tty)
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{
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exec_reverse_once ("nexti", args, from_tty);
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}
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static void
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reverse_continue (const char *args, int from_tty)
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{
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exec_reverse_once ("continue", args, from_tty);
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}
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static void
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reverse_finish (const char *args, int from_tty)
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{
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exec_reverse_once ("finish", args, from_tty);
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}
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/* Data structures for a bookmark list. */
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struct bookmark {
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struct bookmark *next;
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int number;
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CORE_ADDR pc;
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struct symtab_and_line sal;
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gdb_byte *opaque_data;
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};
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static struct bookmark *bookmark_chain;
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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_SAFE(B,TMP) \
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for ((B) = bookmark_chain; \
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(B) ? ((TMP) = (B)->next, 1) : 0; \
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(B) = (TMP))
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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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Insert bookmark identifier into list.
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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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static void
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save_bookmark_command (const char *args, int from_tty)
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{
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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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struct gdbarch *gdbarch = get_current_regcache ()->arch ();
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/* CR should not cause another identical bookmark. */
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dont_repeat ();
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if (bookmark_id == NULL)
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error (_("target_get_bookmark failed."));
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/* Set up a bookmark struct. */
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bookmark *b = new bookmark ();
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b->number = ++bookmark_count;
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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.pspace = get_frame_program_space (get_current_frame ());
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b->opaque_data = bookmark_id;
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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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of bookmarks will come out in order of increasing numbers. */
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bookmark *b1 = bookmark_chain;
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if (b1 == 0)
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bookmark_chain = b;
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else
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{
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while (b1->next)
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b1 = b1->next;
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b1->next = b;
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}
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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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}
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/* Implement "delete bookmark" command. */
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static int
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delete_one_bookmark (int num)
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{
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struct bookmark *b1, *b;
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/* Find bookmark with corresponding number. */
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ALL_BOOKMARKS (b)
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if (b->number == num)
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break;
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/* Special case, first item in list. */
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if (b == bookmark_chain)
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bookmark_chain = b->next;
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/* Find bookmark preceding "marked" one, so we can unlink. */
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if (b)
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{
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ALL_BOOKMARKS (b1)
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if (b1->next == b)
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{
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/* Found designated bookmark. Unlink and delete. */
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b1->next = b->next;
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break;
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}
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xfree (b->opaque_data);
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delete b;
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return 1; /* success */
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}
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return 0; /* failure */
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}
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static void
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delete_all_bookmarks (void)
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{
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struct bookmark *b, *b1;
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ALL_BOOKMARKS_SAFE (b, b1)
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{
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xfree (b->opaque_data);
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xfree (b);
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}
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bookmark_chain = NULL;
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}
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static void
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delete_bookmark_command (const char *args, int from_tty)
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{
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if (bookmark_chain == NULL)
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{
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warning (_("No bookmarks."));
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return;
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}
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if (args == NULL || args[0] == '\0')
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{
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if (from_tty && !query (_("Delete all bookmarks? ")))
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return;
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delete_all_bookmarks ();
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return;
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}
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number_or_range_parser parser (args);
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while (!parser.finished ())
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{
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int num = parser.get_number ();
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if (!delete_one_bookmark (num))
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/* Not found. */
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warning (_("No bookmark #%d."), num);
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}
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}
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/* Implement "goto-bookmark" command. */
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static void
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goto_bookmark_command (const char *args, int from_tty)
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{
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struct bookmark *b;
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unsigned long num;
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const char *p = args;
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if (args == NULL || args[0] == '\0')
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error (_("Command requires an argument."));
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if (startswith (args, "start")
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|| startswith (args, "begin")
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|| startswith (args, "end"))
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{
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/* Special case. Give target opportunity to handle. */
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target_goto_bookmark ((gdb_byte *) args, from_tty);
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return;
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}
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if (args[0] == '\'' || args[0] == '\"')
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{
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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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error (_("Unbalanced quotes: %s"), args);
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target_goto_bookmark ((gdb_byte *) args, from_tty);
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return;
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}
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/* General case. Bookmark identified by bookmark number. */
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num = get_number (&args);
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if (num == 0)
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error (_("goto-bookmark: invalid bookmark number '%s'."), p);
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ALL_BOOKMARKS (b)
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if (b->number == num)
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break;
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if (b)
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{
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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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return;
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}
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/* Not found. */
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error (_("goto-bookmark: no bookmark found for '%s'."), p);
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}
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static int
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bookmark_1 (int bnum)
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{
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struct gdbarch *gdbarch = get_current_regcache ()->arch ();
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struct bookmark *b;
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int matched = 0;
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ALL_BOOKMARKS (b)
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{
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if (bnum == -1 || bnum == b->number)
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{
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printf_filtered (" %d %s '%s'\n",
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b->number,
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paddress (gdbarch, b->pc),
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b->opaque_data);
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matched++;
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}
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}
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if (bnum > 0 && matched == 0)
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printf_filtered ("No bookmark #%d\n", bnum);
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return matched;
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}
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/* Implement "info bookmarks" command. */
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static void
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info_bookmarks_command (const char *args, int from_tty)
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{
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if (!bookmark_chain)
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printf_filtered (_("No bookmarks.\n"));
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else if (args == NULL || *args == '\0')
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bookmark_1 (-1);
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else
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{
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number_or_range_parser parser (args);
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while (!parser.finished ())
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{
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int bnum = parser.get_number ();
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bookmark_1 (bnum);
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}
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}
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}
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void _initialize_reverse ();
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void
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_initialize_reverse ()
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{
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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\
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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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add_com_alias ("rs", "reverse-step", class_run, 1);
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add_com ("reverse-next", class_run, reverse_next, _("\
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Step program backward, proceeding through subroutine calls.\n\
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Like the \"reverse-step\" command as long as subroutine calls do not happen;\n\
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when they do, the call is treated as one instruction.\n\
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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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add_com_alias ("rn", "reverse-next", class_run, 1);
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add_com ("reverse-stepi", class_run, reverse_stepi, _("\
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Step backward exactly one instruction.\n\
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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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add_com_alias ("rsi", "reverse-stepi", class_run, 0);
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add_com ("reverse-nexti", class_run, reverse_nexti, _("\
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Step backward one instruction, but proceed through called subroutines.\n\
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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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add_com_alias ("rni", "reverse-nexti", class_run, 0);
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add_com ("reverse-continue", class_run, reverse_continue, _("\
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Continue program being debugged but run it in reverse.\n\
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If proceeding from breakpoint, a number N may be used as an argument,\n\
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which means to set the ignore count of that breakpoint to N - 1 (so that\n\
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the breakpoint won't break until the Nth time it is reached)."));
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add_com_alias ("rc", "reverse-continue", class_run, 0);
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add_com ("reverse-finish", class_run, reverse_finish, _("\
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Execute backward until just before selected stack frame is called."));
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add_com ("bookmark", class_bookmark, save_bookmark_command, _("\
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Set a bookmark in the program's execution history.\n\
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A bookmark represents a point in the execution history \n\
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that can be returned to at a later point in the debug session."));
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add_info ("bookmarks", info_bookmarks_command, _("\
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Status of user-settable bookmarks.\n\
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Bookmarks are user-settable markers representing a point in the \n\
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execution history that can be returned to later in the same debug \n\
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session."));
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add_cmd ("bookmark", class_bookmark, delete_bookmark_command, _("\
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Delete a bookmark from the bookmark list.\n\
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Argument is a bookmark number or numbers,\n\
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or no argument to delete all bookmarks."),
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&deletelist);
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add_com ("goto-bookmark", class_bookmark, goto_bookmark_command, _("\
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Go to an earlier-bookmarked point in the program's execution history.\n\
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Argument is the bookmark number of a bookmark saved earlier by using \n\
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the 'bookmark' command, or the special arguments:\n\
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start (beginning of recording)\n\
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end (end of recording)"));
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}
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