2004-04-02 Andrew Cagney <cagney@redhat.com>
* infrun.c (pc_in_sigtramp): Delete function. (check_sigtramp2): Inline call to pc_in_sigtramp, use get_frame_type.
This commit is contained in:
Andrew Cagney
parent
08e69816c7
commit
f04ceafa43
|
|
@ -1,3 +1,9 @@
|
|||
2004-04-02 Andrew Cagney <cagney@redhat.com>
|
||||
|
||||
* infrun.c (pc_in_sigtramp): Delete function.
|
||||
(check_sigtramp2): Inline call to pc_in_sigtramp, use
|
||||
get_frame_type.
|
||||
|
||||
2004-04-02 Andrew Cagney <cagney@redhat.com>
|
||||
|
||||
* infrun.c (handle_step_into_function): Delete code conditional on
|
||||
|
|
|
|||
95
gdb/infrun.c
95
gdb/infrun.c
|
|
@ -1203,39 +1203,6 @@ context_switch (struct execution_control_state *ecs)
|
|||
inferior_ptid = ecs->ptid;
|
||||
}
|
||||
|
||||
/* Wrapper for DEPRECATED_PC_IN_SIGTRAMP that takes care of the need
|
||||
to find the function's name.
|
||||
|
||||
In a classic example of "left hand VS right hand", "infrun.c" was
|
||||
trying to improve GDB's performance by caching the result of calls
|
||||
to calls to find_pc_partial_funtion, while at the same time
|
||||
find_pc_partial_function was also trying to ramp up performance by
|
||||
caching its most recent return value. The below makes the the
|
||||
function find_pc_partial_function solely responsibile for
|
||||
performance issues (the local cache that relied on a global
|
||||
variable - arrrggg - deleted).
|
||||
|
||||
Using the testsuite and gcov, it was found that dropping the local
|
||||
"infrun.c" cache and instead relying on find_pc_partial_function
|
||||
increased the number of calls to 12000 (from 10000), but the number
|
||||
of times find_pc_partial_function's cache missed (this is what
|
||||
matters) was only increased by only 4 (to 3569). (A quick back of
|
||||
envelope caculation suggests that the extra 2000 function calls
|
||||
@1000 extra instructions per call make the 1 MIP VAX testsuite run
|
||||
take two extra seconds, oops :-)
|
||||
|
||||
Long term, this function can be eliminated, replaced by the code:
|
||||
get_frame_type(current_frame()) == SIGTRAMP_FRAME (for new
|
||||
architectures this is very cheap). */
|
||||
|
||||
static int
|
||||
pc_in_sigtramp (CORE_ADDR pc)
|
||||
{
|
||||
char *name;
|
||||
find_pc_partial_function (pc, &name, NULL, NULL);
|
||||
return DEPRECATED_PC_IN_SIGTRAMP (pc, name);
|
||||
}
|
||||
|
||||
/* Handle the inferior event in the cases when we just stepped
|
||||
into a function. */
|
||||
|
||||
|
|
@ -2727,37 +2694,45 @@ currently_stepping (struct execution_control_state *ecs)
|
|||
static void
|
||||
check_sigtramp2 (struct execution_control_state *ecs)
|
||||
{
|
||||
if (trap_expected
|
||||
&& pc_in_sigtramp (stop_pc)
|
||||
&& !pc_in_sigtramp (prev_pc)
|
||||
&& INNER_THAN (read_sp (), step_sp))
|
||||
{
|
||||
/* What has happened here is that we have just stepped the
|
||||
inferior with a signal (because it is a signal which
|
||||
shouldn't make us stop), thus stepping into sigtramp.
|
||||
char *name;
|
||||
struct symtab_and_line sr_sal;
|
||||
|
||||
So we need to set a step_resume_break_address breakpoint and
|
||||
continue until we hit it, and then step. FIXME: This should
|
||||
be more enduring than a step_resume breakpoint; we should
|
||||
know that we will later need to keep going rather than
|
||||
re-hitting the breakpoint here (see the testsuite,
|
||||
gdb.base/signals.exp where it says "exceedingly difficult"). */
|
||||
/* Check that what has happened here is that we have just stepped
|
||||
the inferior with a signal (because it is a signal which
|
||||
shouldn't make us stop), thus stepping into sigtramp. */
|
||||
|
||||
struct symtab_and_line sr_sal;
|
||||
if (!trap_expected)
|
||||
return;
|
||||
if (get_frame_type (get_current_frame ()) != SIGTRAMP_FRAME)
|
||||
return;
|
||||
/* Long term, this function can be eliminated, replaced by the code:
|
||||
get_frame_type(current_frame()) == SIGTRAMP_FRAME (for new
|
||||
architectures this is very cheap). */
|
||||
find_pc_partial_function (prev_pc, &name, NULL, NULL);
|
||||
if (DEPRECATED_PC_IN_SIGTRAMP (prev_pc, name))
|
||||
return;
|
||||
if (!INNER_THAN (read_sp (), step_sp))
|
||||
return;
|
||||
|
||||
init_sal (&sr_sal); /* initialize to zeroes */
|
||||
sr_sal.pc = prev_pc;
|
||||
sr_sal.section = find_pc_overlay (sr_sal.pc);
|
||||
/* We perhaps could set the frame if we kept track of what the
|
||||
frame corresponding to prev_pc was. But we don't, so don't. */
|
||||
through_sigtramp_breakpoint =
|
||||
set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp);
|
||||
if (breakpoints_inserted)
|
||||
insert_breakpoints ();
|
||||
/* So we need to set a step_resume_break_address breakpoint and
|
||||
continue until we hit it, and then step. FIXME: This should be
|
||||
more enduring than a step_resume breakpoint; we should know that
|
||||
we will later need to keep going rather than re-hitting the
|
||||
breakpoint here (see the testsuite, gdb.base/signals.exp where it
|
||||
says "exceedingly difficult"). */
|
||||
|
||||
ecs->remove_breakpoints_on_following_step = 1;
|
||||
ecs->another_trap = 1;
|
||||
}
|
||||
init_sal (&sr_sal); /* initialize to zeroes */
|
||||
sr_sal.pc = prev_pc;
|
||||
sr_sal.section = find_pc_overlay (sr_sal.pc);
|
||||
/* We perhaps could set the frame if we kept track of what the frame
|
||||
corresponding to prev_pc was. But we don't, so don't. */
|
||||
through_sigtramp_breakpoint =
|
||||
set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp);
|
||||
if (breakpoints_inserted)
|
||||
insert_breakpoints ();
|
||||
|
||||
ecs->remove_breakpoints_on_following_step = 1;
|
||||
ecs->another_trap = 1;
|
||||
}
|
||||
|
||||
/* Subroutine call with source code we should not step over. Do step
|
||||
|
|
|
|||
Loading…
Reference in New Issue