2009-07-25 Michael Snyder <msnyder@vmware.com>

* checkpoint.c: New file, target-agnostic checkpoints.
	* checkpoint.h: New file, interface.
	* Makefile.in (SFILES): Add checkpoint.c.

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2009-07-25  Michael Snyder  <msnyder@vmware.com>
+
+	* checkpoint.c: New file, target-agnostic checkpoints.
+	* checkpoint.h: New file, interface.
+	* Makefile.in (SFILES): Add checkpoint.c.
+
 2009-07-25  Michael Snyder  <msnyder@vmware.com>
 
 	* target.h (struct target_ops): New methods to_set_checkpoint,

gdb/Makefile.in

@@ -667,7 +667,7 @@ SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
 	stabsread.c stack.c std-regs.c symfile.c symfile-mem.c symmisc.c \
 	symtab.c \
 	target.c target-descriptions.c target-memory.c \
-	thread.c top.c tracepoint.c \
+	thread.c top.c tracepoint.c checkpoint.c \
 	trad-frame.c \
 	tramp-frame.c \
 	typeprint.c \
@@ -736,7 +736,7 @@ coff-pe-read.h parser-defs.h gdb_ptrace.h mips-linux-tdep.h \
 m68k-tdep.h spu-tdep.h jv-lang.h environ.h solib-irix.h amd64-tdep.h \
 doublest.h regset.h hppa-tdep.h ppc-linux-tdep.h rs6000-tdep.h \
 gdb_locale.h gdb_dirent.h arch-utils.h trad-frame.h gnu-nat.h \
-language.h nbsd-tdep.h wrapper.h solib-svr4.h \
+language.h nbsd-tdep.h wrapper.h solib-svr4.h checkpoint.h \
 macroexp.h ui-file.h regcache.h gdb_string.h tracepoint.h i386-tdep.h \
 inf-child.h p-lang.h event-top.h gdbtypes.h scm-tags.h user-regs.h \
 regformats/regdef.h config/alpha/nm-osf3.h  config/i386/nm-i386gnu.h \
@@ -786,6 +786,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
 	block.o symtab.o symfile.o symmisc.o linespec.o dictionary.o \
 	infcall.o \
 	infcmd.o infrun.o \
+	checkpoint.o \
 	expprint.o environ.o stack.o thread.o \
 	exceptions.o \
 	inf-child.o \

gdb/checkpoint.c

@@ -0,0 +1,97 @@
+/* Target-agnostic module for checkpoint commands.
+
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* XXX mvs put the actual commands here, and add them to gdb's
+   command lists only by request.
+
+   TBD: actually manage the list here?
+   How would that interplay with forks as written now?
+*/
+
+#include "defs.h"
+#include "target.h"
+#include "gdbcmd.h"
+
+/* Set a checkpoint (call target_ops method).  */
+
+static void
+checkpoint_command (char *args, int from_tty)
+{
+  if (target_set_checkpoint)
+    target_set_checkpoint (args, from_tty);
+  else
+    error (_("checkpoint command not implemented for this target."));
+}
+
+/* Restore a checkpoint (call target_ops method).  */
+
+static void
+restart_command (char *args, int from_tty)
+{
+  if (target_restore_checkpoint)
+    target_restore_checkpoint (args, from_tty);
+  else
+    error (_("restart command not implemented for this target."));
+}
+
+/* Delete a checkpoint (call target_ops method).  */
+
+static void
+delete_checkpoint_command (char *args, int from_tty)
+{
+  if (target_unset_checkpoint)
+    target_unset_checkpoint (args, from_tty);
+  else
+    error (_("delete checkpoint command not implemented for this target."));
+}
+
+static void
+info_checkpoints_command (char *args, int from_tty)
+{
+  if (target_info_checkpoints)
+    target_info_checkpoints (args, from_tty);
+  else
+    error (_("info checkpoints command not implemented for this target."));
+}
+
+
+/* Initializer function checkpoint_init().
+   Note -- not called in the usual gdb module-initializer manner, 
+   but only by explicit request by targets that want checkpoints.  */
+
+void
+checkpoint_init (void)
+{
+  add_com ("checkpoint", class_obscure, checkpoint_command, _("\
+Create a checkpoint that can be restored later via 'restart'."));
+
+  /* Restart command: restore the context of a specified checkpoint
+     process.  */
+
+  add_com ("restart", class_obscure, restart_command, _("\
+restart <n>: restore program context from a checkpoint.\n\
+Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'."));
+
+  add_cmd ("checkpoint", class_obscure, delete_checkpoint_command, _("\
+Delete a previously saved checkpoint."),
+	   &deletelist);
+
+  add_info ("checkpoints", info_checkpoints_command,
+	    _("IDs of currently known checkpoints."));
+}

gdb/checkpoint.h

@@ -0,0 +1,25 @@
+/* External interface for checkpoint module.
+   Copyright (C) 2009
+   Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#if !defined (CHECKPOINT_H)
+#define CHECKPOINT_H 1
+
+extern void checkpoint_init (void);
+
+#endif	/* CHECKPOINT_H */