gdb:
* target.h (struct target_ops) <to_use_agent>: New field. (struct target_ops) <to_can_use_agent>: New field. (target_use_agent, target_can_use_agent): New macro. * target.c (update_current_target): Update. * remote.c: New enum `PACKET_QAgent'. (remote_protocol_features): Add a new element. (remote_use_agent, remote_can_use_agent): New. (init_remote_ops): Initialize field `can_use_agent' with remote_can_use_agent. Intiailize field `use_agent' with remote_use_agent. * common/agent.c (use_agent): New global. * common/agent.h: Declare it. * tracepoint.c (info_static_tracepoint_markers_command): Add comment. * Makefile.in (SFILES): Add common/agent.c and agent.c. (COMMON_OBS): Add common/agent.o and agent.o (common-agent.o): New rule. * agent.c: New. gdb/doc: * gdb.texinfo (In-Process Agent): New node. Document new commands. (General Query Packets): Add packet `QAgent'. gdb/gdbserver: * linux-low.c (linux_supports_agent): New. (linux_target_ops): Initialize field `supports_agent' with linux_supports_agent. * target.h (struct target_ops) <supports_agent>: New. (target_supports_agent): New macro. * server.c (handle_general_set): Handle packet 'QAgent'. (handle_query): Send `QAgent+'. * Makefile.in (server.o): Depends on agent.h.
This commit is contained in:
Yao Qi
parent
2fa291aca4
commit
d1feda864e
@ -1,3 +1,24 @@
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2012-03-03 Yao Qi <yao@codesourcery.com>
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* target.h (struct target_ops) <to_use_agent>: New field.
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(struct target_ops) <to_can_use_agent>: New field.
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(target_use_agent, target_can_use_agent): New macro.
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* target.c (update_current_target): Update.
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* remote.c: New enum `PACKET_QAgent'.
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(remote_protocol_features): Add a new element.
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(remote_use_agent, remote_can_use_agent): New.
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(init_remote_ops): Initialize field `can_use_agent' with
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remote_can_use_agent. Intiailize field `use_agent' with
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remote_use_agent.
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* common/agent.c (use_agent): New global.
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* common/agent.h: Declare it.
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* tracepoint.c (info_static_tracepoint_markers_command): Add
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comment.
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* Makefile.in (SFILES): Add common/agent.c and agent.c.
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(COMMON_OBS): Add common/agent.o and agent.o
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(common-agent.o): New rule.
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* agent.c: New.
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2012-03-03 Yao Qi <yao@codesourcery.com>
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* common/agent.c: New.
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@ -684,6 +684,7 @@ TARGET_FLAGS_TO_PASS = \
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SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
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addrmap.c \
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auxv.c ax-general.c ax-gdb.c \
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agent.c \
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bcache.c \
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bfd-target.c \
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block.c blockframe.c breakpoint.c buildsym.c \
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@ -740,7 +741,7 @@ SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
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annotate.c common/signals.c copying.c dfp.c gdb.c inf-child.c \
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regset.c sol-thread.c windows-termcap.c \
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common/common-utils.c common/xml-utils.c \
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common/ptid.c common/buffer.c gdb-dlfcn.c
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common/ptid.c common/buffer.c gdb-dlfcn.c common/agent.c
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LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c
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@ -854,6 +855,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
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annotate.o \
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addrmap.o \
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auxv.o \
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agent.o \
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bfd-target.o \
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blockframe.o breakpoint.o findvar.o regcache.o \
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charset.o continuations.o corelow.o disasm.o dummy-frame.o dfp.o \
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@ -908,7 +910,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
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target-descriptions.o target-memory.o xml-tdesc.o xml-builtin.o \
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inferior.o osdata.o gdb_usleep.o record.o gcore.o \
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jit.o progspace.o skip.o \
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common-utils.o buffer.o ptid.o gdb-dlfcn.o
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common-utils.o buffer.o ptid.o gdb-dlfcn.o common-agent.o
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TSOBS = inflow.o
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@ -1927,6 +1929,10 @@ linux-procfs.o: $(srcdir)/common/linux-procfs.c
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$(COMPILE) $(srcdir)/common/linux-procfs.c
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$(POSTCOMPILE)
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common-agent.o: $(srcdir)/common/agent.c
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$(COMPILE) $(srcdir)/common/agent.c
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$(POSTCOMPILE)
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#
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# gdb/tui/ dependencies
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#
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73
gdb/agent.c
Normal file
73
gdb/agent.c
Normal file
@ -0,0 +1,73 @@
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/* Copyright (C) 2012 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 "command.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "agent.h"
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/* Enum strings for "set|show agent". */
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static const char can_use_agent_on[] = "on";
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static const char can_use_agent_off[] = "off";
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static const char *can_use_agent_enum[] =
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{
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can_use_agent_on,
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can_use_agent_off,
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NULL,
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};
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static const char *can_use_agent = can_use_agent_off;
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static void
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show_can_use_agent (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file,
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_("Debugger's willingness to use agent in inferior "
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"as a helper is %s.\n"), value);
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}
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static void
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set_can_use_agent (char *args, int from_tty, struct cmd_list_element *c)
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{
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if (target_use_agent (can_use_agent == can_use_agent_on) == 0)
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/* Something wrong during setting, set flag to default value. */
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can_use_agent = can_use_agent_off;
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}
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/* -Wmissing-prototypes */
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extern initialize_file_ftype _initialize_agent;
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void
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_initialize_agent (void)
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{
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add_setshow_enum_cmd ("agent", class_run,
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can_use_agent_enum,
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&can_use_agent, _("\
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Set debugger's willingness to use agent as a helper."), _("\
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Show debugger's willingness to use agent as a helper."), _("\
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If on, GDB will delegate some of the debugging operations to the\n\
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agent, if the target supports it. This will speed up those\n\
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operations that are supported by the agent.\n\
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If off, GDB will not use agent, even if such is supported by the\n\
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target."),
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set_can_use_agent,
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show_can_use_agent,
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&setlist, &showlist);
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}
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@ -41,6 +41,9 @@ int debug_agent = 0;
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fprintf_unfiltered (gdb_stdlog, fmt, ##args);
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#endif
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/* Global flag to determine using agent or not. */
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int use_agent = 0;
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/* Addresses of in-process agent's symbols both GDB and GDBserver cares
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about. */
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@ -35,3 +35,4 @@ int agent_look_up_symbols (void);
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extern int debug_agent;
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extern int use_agent;
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@ -1,3 +1,9 @@
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2012-03-03 Yao Qi <yao@codesourcery.com>
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* gdb.texinfo (In-Process Agent): New node.
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Document new commands.
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(General Query Packets): Add packet `QAgent'.
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2012-03-01 Maciej W. Rozycki <macro@codesourcery.com>
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* gdb.texinfo (MIPS Features): Add org.gnu.gdb.mips.dsp.
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@ -154,6 +154,7 @@ software in general. We will miss him.
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* GDB/MI:: @value{GDBN}'s Machine Interface.
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* Annotations:: @value{GDBN}'s annotation interface.
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* JIT Interface:: Using the JIT debugging interface.
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* In-Process Agent:: In-Process Agent
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* GDB Bugs:: Reporting bugs in @value{GDBN}
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@ -32286,6 +32287,63 @@ frame and to write out the values of the registers in the previous
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frame. Both have a callback (@code{target_read}) to read bytes off the
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target's address space.
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@node In-Process Agent
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@chapter In-Process Agent
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@cindex debugging agent
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The traditional debugging model is conceptually low-speed, but works fine,
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because most bugs can be reproduced in debugging-mode execution. However,
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as multi-core or many-core processors are becoming mainstream, and
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multi-threaded programs become more and more popular, there should be more
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and more bugs that only manifest themselves at normal-mode execution, for
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example, thread races, because debugger's interference with the program's
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timing may conceal the bugs. On the other hand, in some applications,
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it is not feasible for the debugger to interrupt the program's execution
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long enough for the developer to learn anything helpful about its behavior.
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If the program's correctness depends on its real-time behavior, delays
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introduced by a debugger might cause the program to fail, even when the
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code itself is correct. It is useful to be able to observe the program's
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behavior without interrupting it.
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Therefore, traditional debugging model is too intrusive to reproduce
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some bugs. In order to reduce the interference with the program, we can
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reduce the number of operations performed by debugger. The
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@dfn{In-Process Agent}, a shared library, is running within the same
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process with inferior, and is able to perform some debugging operations
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itself. As a result, debugger is only involved when necessary, and
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performance of debugging can be improved accordingly. Note that
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interference with program can be reduced but can't be removed completely,
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because the in-process agent will still stop or slow down the program.
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The in-process agent can interpret and execute Agent Expressions
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(@pxref{Agent Expressions}) during performing debugging operations. The
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agent expressions can be used for different purposes, such as collecting
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data in tracepoints, and condition evaluation in breakpoints.
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@anchor{Control Agent}
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You can control whether the in-process agent is used as an aid for
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debugging with the following commands:
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@table @code
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@kindex set agent on
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@item set agent on
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Causes the in-process agent to perform some operations on behalf of the
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debugger. Just which operations requested by the user will be done
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by the in-process agent depends on the its capabilities. For example,
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if you request to evaluate breakpoint conditions in the in-process agent,
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and the in-process agent has such capability as well, then breakpoint
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conditions will be evaluated in the in-process agent.
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@kindex set agent off
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@item set agent off
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Disables execution of debugging operations by the in-process agent. All
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of the operations will be performed by @value{GDBN}.
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@kindex show agent
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@item show agent
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Display the current setting of execution of debugging operations by
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the in-process agent.
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@end table
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@node GDB Bugs
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@chapter Reporting Bugs in @value{GDBN}
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@cindex bugs in @value{GDBN}
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@ -34623,6 +34681,11 @@ Here are the currently defined query and set packets:
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@table @samp
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@item QAgent:1
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@item QAgent:0
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Turn on or off the agent as a helper to perform some debugging operations
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delegated from @value{GDBN} (@pxref{Control Agent}).
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@item QAllow:@var{op}:@var{val}@dots{}
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@cindex @samp{QAllow} packet
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Specify which operations @value{GDBN} expects to request of the
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@ -35207,6 +35270,11 @@ These are the currently defined stub features and their properties:
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@tab @samp{-}
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@tab No
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@item @samp{QAgent}
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@tab No
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@tab @samp{-}
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@tab No
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@item @samp{QAllow}
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@tab No
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@tab @samp{-}
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@ -35345,6 +35413,9 @@ The remote stub accepts and implements the reverse step packet
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The remote stub understands the @samp{QTDPsrc} packet that supplies
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the source form of tracepoint definitions.
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@item QAgent
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The remote stub understands the @samp{QAgent} packet.
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@item QAllow
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The remote stub understands the @samp{QAllow} packet.
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@ -1,3 +1,14 @@
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2012-03-03 Yao Qi <yao@codesourcery.com>
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|
||||
* linux-low.c (linux_supports_agent): New.
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(linux_target_ops): Initialize field `supports_agent' with
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linux_supports_agent.
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||||
* target.h (struct target_ops) <supports_agent>: New.
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(target_supports_agent): New macro.
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* server.c (handle_general_set): Handle packet 'QAgent'.
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(handle_query): Send `QAgent+'.
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* Makefile.in (server.o): Depends on agent.h.
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2012-03-03 Yao Qi <yao@codesourcery.com>
|
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|
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* Makefile.in (OBS): Add agent.o.
|
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|
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@ -400,7 +400,7 @@ mem-break.o: mem-break.c $(server_h) $(ax_h)
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proc-service.o: proc-service.c $(server_h) $(gdb_proc_service_h)
|
||||
regcache.o: regcache.c $(server_h) $(regdef_h)
|
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remote-utils.o: remote-utils.c terminal.h $(server_h)
|
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server.o: server.c $(server_h)
|
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server.o: server.c $(server_h) $(agent_h)
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target.o: target.c $(server_h)
|
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thread-db.o: thread-db.c $(server_h) $(linux_low_h) $(gdb_proc_service_h) \
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$(gdb_thread_db_h)
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|
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@ -4854,6 +4854,12 @@ linux_supports_disable_randomization (void)
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#endif
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}
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static int
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linux_supports_agent (void)
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{
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return 1;
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}
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|
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/* Enumerate spufs IDs for process PID. */
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static int
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spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len)
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@ -5576,6 +5582,7 @@ static struct target_ops linux_target_ops = {
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linux_supports_disable_randomization,
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linux_get_min_fast_tracepoint_insn_len,
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linux_qxfer_libraries_svr4,
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linux_supports_agent,
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};
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static void
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@ -18,6 +18,7 @@
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "agent.h"
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#if HAVE_UNISTD_H
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#include <unistd.h>
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@ -529,6 +530,30 @@ handle_general_set (char *own_buf)
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&& handle_tracepoint_general_set (own_buf))
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return;
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|
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if (strncmp ("QAgent:", own_buf, strlen ("QAgent:")) == 0)
|
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{
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char *mode = own_buf + strlen ("QAgent:");
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int req = 0;
|
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|
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if (strcmp (mode, "0") == 0)
|
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req = 0;
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else if (strcmp (mode, "1") == 0)
|
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req = 1;
|
||||
else
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||||
{
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/* We don't know what this value is, so complain to GDB. */
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sprintf (own_buf, "E.Unknown QAgent value");
|
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return;
|
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}
|
||||
|
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/* Update the flag. */
|
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use_agent = req;
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if (remote_debug)
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fprintf (stderr, "[%s agent]\n", req ? "Enable" : "Disable");
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write_ok (own_buf);
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return;
|
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}
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/* Otherwise we didn't know what packet it was. Say we didn't
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understand it. */
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own_buf[0] = 0;
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@ -1624,6 +1649,9 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
|
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/* Support target-side breakpoint conditions. */
|
||||
strcat (own_buf, ";ConditionalBreakpoints+");
|
||||
|
||||
if (target_supports_agent ())
|
||||
strcat (own_buf, ";QAgent+");
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
@ -394,6 +394,9 @@ struct target_ops
|
||||
int (*qxfer_libraries_svr4) (const char *annex, unsigned char *readbuf,
|
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unsigned const char *writebuf,
|
||||
CORE_ADDR offset, int len);
|
||||
|
||||
/* Return true if target supports debugging agent. */
|
||||
int (*supports_agent) (void);
|
||||
};
|
||||
|
||||
extern struct target_ops *the_target;
|
||||
@ -514,6 +517,10 @@ void set_target_ops (struct target_ops *);
|
||||
(the_target->supports_disable_randomization ? \
|
||||
(*the_target->supports_disable_randomization) () : 0)
|
||||
|
||||
#define target_supports_agent() \
|
||||
(the_target->supports_agent ? \
|
||||
(*the_target->supports_agent) () : 0)
|
||||
|
||||
/* Start non-stop mode, returns 0 on success, -1 on failure. */
|
||||
|
||||
int start_non_stop (int nonstop);
|
||||
|
||||
36
gdb/remote.c
36
gdb/remote.c
@ -65,6 +65,7 @@
|
||||
#include "tracepoint.h"
|
||||
#include "ax.h"
|
||||
#include "ax-gdb.h"
|
||||
#include "agent.h"
|
||||
|
||||
/* Temp hacks for tracepoint encoding migration. */
|
||||
static char *target_buf;
|
||||
@ -1276,6 +1277,7 @@ enum {
|
||||
PACKET_QAllow,
|
||||
PACKET_qXfer_fdpic,
|
||||
PACKET_QDisableRandomization,
|
||||
PACKET_QAgent,
|
||||
PACKET_MAX
|
||||
};
|
||||
|
||||
@ -3848,6 +3850,7 @@ static struct protocol_feature remote_protocol_features[] = {
|
||||
PACKET_qXfer_fdpic },
|
||||
{ "QDisableRandomization", PACKET_DISABLE, remote_supported_packet,
|
||||
PACKET_QDisableRandomization },
|
||||
{ "QAgent", PACKET_DISABLE, remote_supported_packet, PACKET_QAgent},
|
||||
{ "tracenz", PACKET_DISABLE,
|
||||
remote_string_tracing_feature, -1 },
|
||||
};
|
||||
@ -10757,6 +10760,34 @@ remote_set_trace_notes (char *user, char *notes, char *stop_notes)
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
remote_use_agent (int use)
|
||||
{
|
||||
if (remote_protocol_packets[PACKET_QAgent].support != PACKET_DISABLE)
|
||||
{
|
||||
struct remote_state *rs = get_remote_state ();
|
||||
|
||||
/* If the stub supports QAgent. */
|
||||
sprintf (rs->buf, "QAgent:%d", use);
|
||||
putpkt (rs->buf);
|
||||
getpkt (&rs->buf, &rs->buf_size, 0);
|
||||
|
||||
if (strcmp (rs->buf, "OK") == 0)
|
||||
{
|
||||
use_agent = use;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
remote_can_use_agent (void)
|
||||
{
|
||||
return (remote_protocol_packets[PACKET_QAgent].support != PACKET_DISABLE);
|
||||
}
|
||||
|
||||
static void
|
||||
init_remote_ops (void)
|
||||
{
|
||||
@ -10869,6 +10900,8 @@ Specify the serial device it is connected to\n\
|
||||
remote_ops.to_static_tracepoint_markers_by_strid
|
||||
= remote_static_tracepoint_markers_by_strid;
|
||||
remote_ops.to_traceframe_info = remote_traceframe_info;
|
||||
remote_ops.to_use_agent = remote_use_agent;
|
||||
remote_ops.to_can_use_agent = remote_can_use_agent;
|
||||
}
|
||||
|
||||
/* Set up the extended remote vector by making a copy of the standard
|
||||
@ -11382,6 +11415,9 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL,
|
||||
add_packet_config_cmd (&remote_protocol_packets[PACKET_QDisableRandomization],
|
||||
"QDisableRandomization", "disable-randomization", 0);
|
||||
|
||||
add_packet_config_cmd (&remote_protocol_packets[PACKET_QAgent],
|
||||
"QAgent", "agent", 0);
|
||||
|
||||
/* Keep the old ``set remote Z-packet ...'' working. Each individual
|
||||
Z sub-packet has its own set and show commands, but users may
|
||||
have sets to this variable in their .gdbinit files (or in their
|
||||
|
||||
@ -698,6 +698,8 @@ update_current_target (void)
|
||||
INHERIT (to_static_tracepoint_marker_at, t);
|
||||
INHERIT (to_static_tracepoint_markers_by_strid, t);
|
||||
INHERIT (to_traceframe_info, t);
|
||||
INHERIT (to_use_agent, t);
|
||||
INHERIT (to_can_use_agent, t);
|
||||
INHERIT (to_magic, t);
|
||||
INHERIT (to_supports_evaluation_of_breakpoint_conditions, t);
|
||||
/* Do not inherit to_memory_map. */
|
||||
@ -929,6 +931,12 @@ update_current_target (void)
|
||||
de_fault (to_supports_evaluation_of_breakpoint_conditions,
|
||||
(int (*) (void))
|
||||
return_zero);
|
||||
de_fault (to_use_agent,
|
||||
(int (*) (int))
|
||||
tcomplain);
|
||||
de_fault (to_can_use_agent,
|
||||
(int (*) (void))
|
||||
return_zero);
|
||||
de_fault (to_execution_direction, default_execution_direction);
|
||||
|
||||
#undef de_fault
|
||||
|
||||
13
gdb/target.h
13
gdb/target.h
@ -836,6 +836,13 @@ struct target_ops
|
||||
re-fetching when necessary. */
|
||||
struct traceframe_info *(*to_traceframe_info) (void);
|
||||
|
||||
/* Ask the target to use or not to use agent according to USE. Return 1
|
||||
successful, 0 otherwise. */
|
||||
int (*to_use_agent) (int use);
|
||||
|
||||
/* Is the target able to use agent in current state? */
|
||||
int (*to_can_use_agent) (void);
|
||||
|
||||
int to_magic;
|
||||
/* Need sub-structure for target machine related rather than comm related?
|
||||
*/
|
||||
@ -1675,6 +1682,12 @@ extern char *target_fileio_read_stralloc (const char *filename);
|
||||
#define target_traceframe_info() \
|
||||
(*current_target.to_traceframe_info) ()
|
||||
|
||||
#define target_use_agent(use) \
|
||||
(*current_target.to_use_agent) (use)
|
||||
|
||||
#define target_can_use_agent() \
|
||||
(*current_target.to_can_use_agent) ()
|
||||
|
||||
/* Command logging facility. */
|
||||
|
||||
#define target_log_command(p) \
|
||||
|
||||
@ -4883,6 +4883,12 @@ info_static_tracepoint_markers_command (char *arg, int from_tty)
|
||||
struct ui_out *uiout = current_uiout;
|
||||
int i;
|
||||
|
||||
/* We don't have to check target_can_use_agent and agent's capability on
|
||||
static tracepoint here, in order to be compatible with older GDBserver.
|
||||
We don't check USE_AGENT is true or not, because static tracepoints
|
||||
don't work without in-process agent, so we don't bother users to type
|
||||
`set agent on' when to use static tracepoint. */
|
||||
|
||||
old_chain
|
||||
= make_cleanup_ui_out_table_begin_end (uiout, 5, -1,
|
||||
"StaticTracepointMarkersTable");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user