From 52834460bc1e8813c8cedd876dac7156b34fa60f Mon Sep 17 00:00:00 2001 From: Markus Metzger Date: Mon, 6 May 2013 16:04:46 +0200 Subject: record-btrace: add (reverse-)stepping support Provide to_resume and to_wait target methods for the btrace record target to allow reverse stepping and replay support. Replay is limited in the sense that only stepping and source correlation are supported. We do not record data and thus can not show variables. Non-stop mode is not working. Do not allow record-btrace in non-stop mode. 2014-01-16 Markus Metzger * btrace.h (btrace_thread_flag): New. (struct btrace_thread_info) : New. * record-btrace.c (record_btrace_resume_thread) (record_btrace_find_thread_to_move, btrace_step_no_history) (btrace_step_stopped, record_btrace_start_replaying) (record_btrace_step_thread, record_btrace_decr_pc_after_break) (record_btrace_find_resume_thread): New. (record_btrace_resume, record_btrace_wait): Extend. (record_btrace_can_execute_reverse): New. (record_btrace_open): Fail in non-stop mode. (record_btrace_set_replay): Split into this, ... (record_btrace_stop_replaying): ... this, ... (record_btrace_clear_histories): ... and this. (init_record_btrace_ops): Init to_can_execute_reverse. * NEWS: Announce it. testsuite/ * gdb.btrace/delta.exp: Check reverse stepi. * gdb.btrace/tailcall.exp: Update. Add stepping tests. * gdb.btrace/finish.exp: New. * gdb.btrace/next.exp: New. * gdb.btrace/nexti.exp: New. * gdb.btrace/record_goto.c: Add comments. * gdb.btrace/step.exp: New. * gdb.btrace/stepi.exp: New. * gdb.btrace/multi-thread-step.c: New. * gdb.btrace/multi-thread-step.exp: New. * gdb.btrace/rn-dl-bind.c: New. * gdb.btrace/rn-dl-bind.exp: New. * gdb.btrace/data.c: New. * gdb.btrace/data.exp: New. * gdb.btrace/Makefile.in (EXECUTABLES): Add new. doc/ * gdb.texinfo: Document limited reverse/replay support for target record-btrace. --- gdb/btrace.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'gdb/btrace.h') diff --git a/gdb/btrace.h b/gdb/btrace.h index 193f916..f83a80f 100644 --- a/gdb/btrace.h +++ b/gdb/btrace.h @@ -153,6 +153,25 @@ struct btrace_call_history struct btrace_call_iterator end; }; +/* Branch trace thread flags. */ +enum btrace_thread_flag +{ + /* The thread is to be stepped forwards. */ + BTHR_STEP = (1 << 0), + + /* The thread is to be stepped backwards. */ + BTHR_RSTEP = (1 << 1), + + /* The thread is to be continued forwards. */ + BTHR_CONT = (1 << 2), + + /* The thread is to be continued backwards. */ + BTHR_RCONT = (1 << 3), + + /* The thread is to be moved. */ + BTHR_MOVE = (BTHR_STEP | BTHR_RSTEP | BTHR_CONT | BTHR_RCONT) +}; + /* Branch trace information per thread. This represents the branch trace configuration as well as the entry point @@ -182,6 +201,9 @@ struct btrace_thread_info becomes zero. */ int level; + /* A bit-vector of btrace_thread_flag. */ + enum btrace_thread_flag flags; + /* The instruction history iterator. */ struct btrace_insn_history *insn_history; -- cgit v1.1