Add branch trace information to struct thread_info.

Add functions to enable, disable, clear, and fetch a thread's branch trace.

gdb/
	* target.h: Include btrace.h.
	(struct target_ops) <to_supports_btrace, to_enable_btrace,
	to_disable_btrace, to_teardown_btrace, to_read_btrace>: New.
	* target.c (target_supports_btrace): New function.
	(target_enable_btrace): New function.
	(target_disable_btrace): New function.
	(target_teardown_btrace): New function.
	(target_read_btrace): New function.
	* btrace.h: New file.
	* btrace.c: New file.
	* Makefile.in: Add btrace.c.
	* gdbthread.h: Include btrace.h.
	(struct thread_info): Add btrace field.
	* thread.c: Include btrace.h.
	(clear_thread_inferior_resources): Call target_teardown_btrace.
	* common/btrace-common.h: New file.

1 files changed, 73 insertions, 0 deletions

diff --git a/gdb/common/btrace-common.h b/gdb/common/btrace-common.h
new file mode 100644
index 0000000..b157c7c
--- /dev/null
+++ b/gdb/common/btrace-common.h
@@ -0,0 +1,73 @@
+/* Branch trace support for GDB, the GNU debugger.
+
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+   Contributed by Intel Corp. <markus.t.metzger@intel.com>.
+
+   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/>.  */
+
+#ifndef BTRACE_COMMON_H
+#define BTRACE_COMMON_H
+
+/* Branch tracing (btrace) is a per-thread control-flow execution trace of the
+   inferior.  For presentation purposes, the branch trace is represented as a
+   list of sequential control-flow blocks, one such list per thread.  */
+
+#ifdef GDBSERVER
+#  include "server.h"
+#else
+#  include "defs.h"
+#endif
+
+#include "vec.h"
+
+/* A branch trace block.
+
+   This represents a block of sequential control-flow.  Adjacent blocks will be
+   connected via calls, returns, or jumps.  The latter can be direct or
+   indirect, conditional or unconditional.  Branches can further be
+   asynchronous, e.g. interrupts.  */
+struct btrace_block
+{
+  /* The address of the first byte of the first instruction in the block.  */
+  CORE_ADDR begin;
+
+  /* The address of the first byte of the last instruction in the block.  */
+  CORE_ADDR end;
+};
+
+/* Branch trace is represented as a vector of branch trace blocks starting with
+   the most recent block.  */
+typedef struct btrace_block btrace_block_s;
+
+/* Define functions operating on a vector of branch trace blocks.  */
+DEF_VEC_O (btrace_block_s);
+
+/* Target specific branch trace information.  */
+struct btrace_target_info;
+
+/* Enumeration of btrace read types.  */
+
+enum btrace_read_type
+{
+  /* Send all available trace.  */
+  btrace_read_all,
+
+  /* Send all available trace, if it changed.  */
+  btrace_read_new
+};
+
+#endif /* BTRACE_COMMON_H */