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gdb/gdb-6.6-scheduler_locking-s...

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2007-06-25 Jan Kratochvil <jan.kratochvil@redhat.com>
* inferior.h (enum resume_step): New definition.
(resume): Change STEP parameter type to ENUM RESUME_STEP.
* infrun.c (resume): Likewise. Extend debug printing of the STEP
parameter. Lock the scheduler only for intentional stepping.
(proceed): Replace the variable ONESTEP with tristate RESUME_STEP.
Set the third RESUME_STEP state according to BPSTAT_SHOULD_STEP.
(currently_stepping): Change the return type to ENUM RESUME_STEP.
Return RESUME_STEP_NEEDED if it is just due to BPSTAT_SHOULD_STEP.
* linux-nat.c (select_singlestep_lwp_callback): Do not focus on
the software watchpoint events.
* linux-nat.h (struct lwp_info): Redeclare STEP as ENUM RESUME_STEP.
2007-10-19 Jan Kratochvil <jan.kratochvil@redhat.com>
* infrun.c (proceed): RESUME_STEP initialized for non-stepping.
RESUME_STEP set according to STEP only at the end of the function.
--- ./gdb/inferior.h 15 Jun 2007 22:44:55 -0000 1.83
+++ ./gdb/inferior.h 25 Jun 2007 20:33:02 -0000
@@ -194,7 +194,15 @@ extern void reopen_exec_file (void);
/* The `resume' routine should only be called in special circumstances.
Normally, use `proceed', which handles a lot of bookkeeping. */
-extern void resume (int, enum target_signal);
+enum resume_step
+ {
+ /* currently_stepping () should return non-zero for non-continue. */
+ RESUME_STEP_CONTINUE = 0,
+ RESUME_STEP_USER, /* Stepping is intentional by the user. */
+ RESUME_STEP_NEEDED /* Stepping only for software watchpoints. */
+ };
+
+extern void resume (enum resume_step, enum target_signal);
/* From misc files */
--- ./gdb/infrun.c 22 Jun 2007 12:47:48 -0000 1.243
+++ ./gdb/infrun.c 25 Jun 2007 20:33:02 -0000
@@ -76,7 +76,8 @@ static void set_schedlock_func (char *ar
struct execution_control_state;
-static int currently_stepping (struct execution_control_state *ecs);
+static enum resume_step currently_stepping (struct execution_control_state
+ *ecs);
static void xdb_handle_command (char *args, int from_tty);
@@ -496,15 +497,18 @@ set_schedlock_func (char *args, int from
STEP nonzero if we should step (zero to continue instead).
SIG is the signal to give the inferior (zero for none). */
void
-resume (int step, enum target_signal sig)
+resume (enum resume_step step, enum target_signal sig)
{
int should_resume = 1;
struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
QUIT;
if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n",
- step, sig);
+ fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%s, signal=%d)\n",
+ (step == RESUME_STEP_CONTINUE ? "RESUME_STEP_CONTINUE"
+ : (step == RESUME_STEP_USER ? "RESUME_STEP_USER"
+ : "RESUME_STEP_NEEDED")),
+ sig);
/* FIXME: calling breakpoint_here_p (read_pc ()) three times! */
@@ -593,9 +597,10 @@ a command like `return' or `jump' to con
resume_ptid = inferior_ptid;
}
- if ((scheduler_mode == schedlock_on)
+ if (scheduler_mode == schedlock_on
|| (scheduler_mode == schedlock_step
- && (step || singlestep_breakpoints_inserted_p)))
+ && (step == RESUME_STEP_USER
+ || singlestep_breakpoints_inserted_p)))
{
/* User-settable 'scheduler' mode requires solo thread resume. */
resume_ptid = inferior_ptid;
@@ -711,7 +716,7 @@ static CORE_ADDR prev_pc;
void
proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
{
- int oneproc = 0;
+ enum resume_step resume_step = RESUME_STEP_CONTINUE;
if (step > 0)
step_start_function = find_pc_function (read_pc ());
@@ -725,13 +731,13 @@ proceed (CORE_ADDR addr, enum target_sig
step one instruction before inserting breakpoints so that
we do not stop right away (and report a second hit at this
breakpoint). */
- oneproc = 1;
+ resume_step = RESUME_STEP_USER;
else if (gdbarch_single_step_through_delay_p (current_gdbarch)
&& gdbarch_single_step_through_delay (current_gdbarch,
get_current_frame ()))
/* We stepped onto an instruction that needs to be stepped
again before re-inserting the breakpoint, do so. */
- oneproc = 1;
+ resume_step = RESUME_STEP_USER;
}
else
{
@@ -755,9 +761,9 @@ proceed (CORE_ADDR addr, enum target_sig
that reported the most recent event. If a step-over is required
it returns TRUE and sets the current thread to the old thread. */
if (prepare_to_proceed () && breakpoint_here_p (read_pc ()))
- oneproc = 1;
+ resume_step = RESUME_STEP_USER;
- if (oneproc)
+ if (resume_step == RESUME_STEP_USER)
/* We will get a trace trap after one instruction.
Continue it automatically and insert breakpoints then. */
trap_expected = 1;
@@ -806,8 +812,13 @@ proceed (CORE_ADDR addr, enum target_sig
updated correctly when the inferior is stopped. */
prev_pc = read_pc ();
+ if (step)
+ resume_step = RESUME_STEP_USER;
+ if (resume_step == RESUME_STEP_CONTINUE && bpstat_should_step ())
+ resume_step = RESUME_STEP_NEEDED;
+
/* Resume inferior. */
- resume (oneproc || step || bpstat_should_step (), stop_signal);
+ resume (resume_step, stop_signal);
/* Wait for it to stop (if not standalone)
and in any case decode why it stopped, and act accordingly. */
@@ -2681,14 +2690,20 @@ process_event_stop_test:
/* Are we in the middle of stepping? */
-static int
+static enum resume_step
currently_stepping (struct execution_control_state *ecs)
{
- return ((!ecs->handling_longjmp
- && ((step_range_end && step_resume_breakpoint == NULL)
- || trap_expected))
- || ecs->stepping_through_solib_after_catch
- || bpstat_should_step ());
+ if (!ecs->handling_longjmp
+ && ((step_range_end && step_resume_breakpoint == NULL) || trap_expected))
+ return RESUME_STEP_USER;
+
+ if (ecs->stepping_through_solib_after_catch)
+ return RESUME_STEP_USER;
+
+ if (bpstat_should_step ())
+ return RESUME_STEP_NEEDED;
+
+ return RESUME_STEP_CONTINUE;
}
/* Subroutine call with source code we should not step over. Do step
--- ./gdb/linux-nat.c 16 Jun 2007 17:16:25 -0000 1.64
+++ ./gdb/linux-nat.c 25 Jun 2007 20:33:02 -0000
@@ -1720,7 +1720,10 @@ count_events_callback (struct lwp_info *
static int
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
{
- if (lp->step && lp->status != 0)
+ /* We do not focus on software watchpoints as we would not catch
+ STEPPING_PAST_SINGLESTEP_BREAKPOINT breakpoints in some other thread
+ as they would remain pending due to `Push back breakpoint for %s'. */
+ if (lp->step == RESUME_STEP_USER && lp->status != 0)
return 1;
else
return 0;
--- ./gdb/linux-nat.h 10 May 2007 21:36:00 -0000 1.18
+++ ./gdb/linux-nat.h 25 Jun 2007 20:33:02 -0000
@@ -53,8 +53,8 @@ struct lwp_info
/* If non-zero, a pending wait status. */
int status;
- /* Non-zero if we were stepping this LWP. */
- int step;
+ /* The kind of stepping of this LWP. */
+ enum resume_step step;
/* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
for this LWP's last event. This may correspond to STATUS above,
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