[patch 3/8] Command `set agent on|off'

[Yao Qi <yao@codesourcery.com>]

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We want to leave users to decide whether they want to use agent or not,
so we add a new command `set agent on|off' in this patch.

-- 
Yao (齐尧)

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2012-01-23  Yao Qi  <yao@codesourcery.com>

	* Makefile.in (SFILES): Add agent.c and common/agent.c.
	(COMMON_OBS): Add agent.o and common/agent.o.
	(common-agent.o): New rule.
	* agent.c: New.
---
 gdb/Makefile.in |   10 ++++++-
 gdb/agent.c     |   68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+), 2 deletions(-)
 create mode 100644 gdb/agent.c

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 25067f1..1d5cf22 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -686,6 +686,7 @@ TARGET_FLAGS_TO_PASS = \
 SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
 	addrmap.c \
 	auxv.c ax-general.c ax-gdb.c \
+	agent.c \
 	bcache.c \
 	bfd-target.c \
 	block.c blockframe.c breakpoint.c buildsym.c \
@@ -742,7 +743,7 @@ SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
 	annotate.c common/signals.c copying.c dfp.c gdb.c inf-child.c \
 	regset.c sol-thread.c windows-termcap.c \
 	common/common-utils.c common/xml-utils.c \
-	common/ptid.c common/buffer.c gdb-dlfcn.c
+	common/ptid.c common/buffer.c gdb-dlfcn.c common/agent.c
 
 LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c
 
@@ -856,6 +857,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
 	annotate.o \
 	addrmap.o \
 	auxv.o \
+	agent.o \
 	bfd-target.o \
 	blockframe.o breakpoint.o findvar.o regcache.o \
 	charset.o continuations.o corelow.o disasm.o dummy-frame.o dfp.o \
@@ -910,7 +912,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
 	target-descriptions.o target-memory.o xml-tdesc.o xml-builtin.o \
 	inferior.o osdata.o gdb_usleep.o record.o gcore.o \
 	jit.o progspace.o skip.o \
-	common-utils.o buffer.o ptid.o gdb-dlfcn.o
+	common-utils.o buffer.o ptid.o gdb-dlfcn.o common-agent.o
 
 TSOBS = inflow.o
 
@@ -1932,6 +1934,10 @@ linux-procfs.o: $(srcdir)/common/linux-procfs.c
 	$(COMPILE) $(srcdir)/common/linux-procfs.c
 	$(POSTCOMPILE)
 
+common-agent.o: $(srcdir)/common/agent.c
+	$(COMPILE) $(srcdir)/common/agent.c
+	$(POSTCOMPILE)
+
 #
 # gdb/tui/ dependencies
 #
diff --git a/gdb/agent.c b/gdb/agent.c
new file mode 100644
index 0000000..67862c5
--- /dev/null
+++ b/gdb/agent.c
@@ -0,0 +1,68 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "command.h"
+#include "gdbcmd.h"
+#include "target.h"
+#include "agent.h"
+
+/* Enum strings for "set|show agent".  */
+
+static const char can_use_agent_on[] = "on";
+static const char can_use_agent_off[] = "off";
+static const char *can_use_agent_enum[] =
+{
+  can_use_agent_on,
+  can_use_agent_off,
+  NULL,
+};
+
+static const char *can_use_agent = can_use_agent_off;
+
+static void
+show_can_use_agent (struct ui_file *file, int from_tty,
+		    struct cmd_list_element *c, const char *value)
+{
+  fprintf_filtered (file,
+		    _("Debugger's willingness to use agent in inferior "
+		      "as a helper is %s.\n"), value);
+}
+
+static void
+set_can_use_agent (char *args, int from_tty, struct cmd_list_element *c)
+{
+  if (target_use_agent (can_use_agent == can_use_agent_on))
+    can_use_agent = can_use_agent_on;
+  else
+    can_use_agent = can_use_agent_off;
+}
+
+void
+_initialize_agent (void)
+{
+  add_setshow_enum_cmd ("agent", class_run,
+			can_use_agent_enum,
+			&can_use_agent, _("\
+Set debugger's willingness to use agent as a helper."), _("\
+Show debugger's willingness to use agent as a helper."), _("\
+If on, gdb will use agent as a helper if it is supported by the target.\n\
+If off, gdb will not use agent, even if such is supported by the target\n"),
+			set_can_use_agent,
+			show_can_use_agent,
+			&setlist, &showlist);
+}
-- 
1.7.0.4