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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.
2008-02-24 Jan Kratochvil <jan.kratochvil@redhat.com>
Port to GDB-6.8pre.
Index: gdb-7.6.90.20140127/gdb/inferior.h
===================================================================
--- gdb-7.6.90.20140127.orig/gdb/inferior.h 2014-01-27 22:05:28.801895347 +0100
+++ gdb-7.6.90.20140127/gdb/inferior.h 2014-01-27 22:33:45.230157813 +0100
@@ -155,7 +155,15 @@ 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 gdb_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 gdb_signal);
extern ptid_t user_visible_resume_ptid (int step);
Index: gdb-7.6.90.20140127/gdb/infrun.c
===================================================================
--- gdb-7.6.90.20140127.orig/gdb/infrun.c 2014-01-27 22:05:28.804895349 +0100
+++ gdb-7.6.90.20140127/gdb/infrun.c 2014-01-27 22:35:12.781224279 +0100
@@ -83,7 +83,7 @@ static int follow_fork (void);
static void set_schedlock_func (char *args, int from_tty,
struct cmd_list_element *c);
-static int currently_stepping (struct thread_info *tp);
+static enum resume_step currently_stepping (struct thread_info *tp);
static int currently_stepping_or_nexting_callback (struct thread_info *tp,
void *data);
@@ -1699,7 +1699,8 @@ user_visible_resume_ptid (int step)
}
else 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;
@@ -1717,7 +1718,7 @@ user_visible_resume_ptid (int step)
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 gdb_signal sig)
+resume (enum resume_step step, enum gdb_signal sig)
{
int should_resume = 1;
struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
@@ -1750,9 +1751,13 @@ resume (int step, enum gdb_signal sig)
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
- "infrun: resume (step=%d, signal=%s), "
+ "infrun: resume (step=%s, signal=%s), "
"trap_expected=%d, current thread [%s] at %s\n",
- step, gdb_signal_to_symbol_string (sig),
+ (step == RESUME_STEP_CONTINUE
+ ? "RESUME_STEP_CONTINUE"
+ : (step == RESUME_STEP_USER ? "RESUME_STEP_USER"
+ : "RESUME_STEP_NEEDED")),
+ gdb_signal_to_symbol_string (sig),
tp->control.trap_expected,
target_pid_to_str (inferior_ptid),
paddress (gdbarch, pc));
@@ -2147,7 +2152,7 @@ proceed (CORE_ADDR addr, enum gdb_signal
CORE_ADDR pc;
struct address_space *aspace;
/* GDB may force the inferior to step due to various reasons. */
- int force_step = 0;
+ enum resume_step resume_step = RESUME_STEP_CONTINUE;
/* If we're stopped at a fork/vfork, follow the branch set by the
"set follow-fork-mode" command; otherwise, we'll just proceed
@@ -2187,13 +2192,13 @@ proceed (CORE_ADDR addr, enum gdb_signal
actually be executing the breakpoint insn anyway.
We'll be (un-)executing the previous instruction. */
- force_step = 1;
+ resume_step = RESUME_STEP_USER;
else if (gdbarch_single_step_through_delay_p (gdbarch)
&& gdbarch_single_step_through_delay (gdbarch,
get_current_frame ()))
/* We stepped onto an instruction that needs to be stepped
again before re-inserting the breakpoint, do so. */
- force_step = 1;
+ resume_step = RESUME_STEP_USER;
}
else
{
@@ -2225,13 +2230,13 @@ proceed (CORE_ADDR addr, enum gdb_signal
is required it returns TRUE and sets the current thread to
the old thread. */
if (prepare_to_proceed (step))
- force_step = 1;
+ resume_step = RESUME_STEP_USER;
}
/* prepare_to_proceed may change the current thread. */
tp = inferior_thread ();
- if (force_step)
+ if (resume_step == RESUME_STEP_USER)
{
tp->control.trap_expected = 1;
/* If displaced stepping is enabled, we can step over the
@@ -2318,9 +2323,13 @@ proceed (CORE_ADDR addr, enum gdb_signal
/* Reset to normal state. */
init_infwait_state ();
+ if (step)
+ resume_step = RESUME_STEP_USER;
+ if (resume_step == RESUME_STEP_CONTINUE && bpstat_should_step ())
+ resume_step = RESUME_STEP_NEEDED;
+
/* Resume inferior. */
- resume (force_step || step || bpstat_should_step (),
- tp->suspend.stop_signal);
+ resume (resume_step, tp->suspend.stop_signal);
/* Wait for it to stop (if not standalone)
and in any case decode why it stopped, and act accordingly. */
@@ -5332,13 +5341,18 @@ switch_back_to_stepped_thread (struct ex
/* Is thread TP in the middle of single-stepping? */
-static int
+static enum resume_step
currently_stepping (struct thread_info *tp)
{
- return ((tp->control.step_range_end
- && tp->control.step_resume_breakpoint == NULL)
- || tp->control.trap_expected
- || bpstat_should_step ());
+ if ((tp->control.step_range_end
+ && tp->control.step_resume_breakpoint == NULL)
+ || tp->control.trap_expected)
+ return RESUME_STEP_USER;
+
+ if (bpstat_should_step ())
+ return RESUME_STEP_NEEDED;
+
+ return RESUME_STEP_CONTINUE;
}
/* Returns true if any thread *but* the one passed in "data" is in the
Index: gdb-7.6.90.20140127/gdb/linux-nat.c
===================================================================
--- gdb-7.6.90.20140127.orig/gdb/linux-nat.c 2014-01-27 22:05:28.806895350 +0100
+++ gdb-7.6.90.20140127/gdb/linux-nat.c 2014-01-27 22:33:45.330157889 +0100
@@ -2697,7 +2697,11 @@ static int
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
{
if (lp->last_resume_kind == resume_step
- && lp->status != 0)
+ && 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'. */
+ && lp->step == RESUME_STEP_USER)
return 1;
else
return 0;
Index: gdb-7.6.90.20140127/gdb/linux-nat.h
===================================================================
--- gdb-7.6.90.20140127.orig/gdb/linux-nat.h 2014-01-27 22:05:28.807895351 +0100
+++ gdb-7.6.90.20140127/gdb/linux-nat.h 2014-01-27 22:33:45.334157892 +0100
@@ -59,8 +59,8 @@ 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;
/* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
watchpoint trap. */
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