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add dummy frame destructor

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The compiler code needed a hook into dummy frame destruction, so that
some state could be kept while the inferior call is made and then
destroyed when the inferior call finishes.

This patch adds an optional destructor to dummy frames and a new API
to access it.

gdb/ChangeLog
2014-12-12  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* dummy-frame.c (struct dummy_frame) <dtor, dtor_data>: New
	fields.
	(pop_dummy_frame): Call the destructor if it exists.
	(register_dummy_frame_dtor, find_dummy_frame_dtor): New
	functions.
	* dummy-frame.h (dummy_frame_dtor_ftype): New typedef.
	(register_dummy_frame_dtor, find_dummy_frame_dtor): Declare.
This commit is contained in:
Jan Kratochvil
2014-05-14 14:01:24 -06:00
parent f166002710
commit 233a8fb382
3 changed files with 64 additions and 0 deletions
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41
gdb/dummy-frame.c
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@@ -61,6 +61,13 @@ struct dummy_frame
/* The caller's state prior to the call. */
struct infcall_suspend_state *caller_state;
/* If non-NULL, a destructor that is run when this dummy frame is
popped. */
void (*dtor) (void *data);
/* Arbitrary data that is passed to DTOR. */
void *dtor_data;
};
static struct dummy_frame *dummy_frame_stack = NULL;
@@ -127,6 +134,10 @@ pop_dummy_frame (struct dummy_frame **dummy_ptr)
struct dummy_frame *dummy = *dummy_ptr;
gdb_assert (ptid_equal (dummy->id.ptid, inferior_ptid));
if (dummy->dtor != NULL)
dummy->dtor (dummy->dtor_data);
restore_infcall_suspend_state (dummy->caller_state);
iterate_over_breakpoints (pop_dummy_frame_bpt, dummy);
@@ -190,6 +201,36 @@ dummy_frame_discard (struct frame_id dummy_id, ptid_t ptid)
remove_dummy_frame (dp);
}
/* See dummy-frame.h. */
void
register_dummy_frame_dtor (struct frame_id dummy_id, ptid_t ptid,
dummy_frame_dtor_ftype *dtor, void *dtor_data)
{
struct dummy_frame_id id = { dummy_id, ptid };
struct dummy_frame **dp, *d;
dp = lookup_dummy_frame (&id);
gdb_assert (dp != NULL);
d = *dp;
gdb_assert (d->dtor == NULL);
d->dtor = dtor;
d->dtor_data = dtor_data;
}
/* See dummy-frame.h. */
int
find_dummy_frame_dtor (dummy_frame_dtor_ftype *dtor, void *dtor_data)
{
struct dummy_frame *d;
for (d = dummy_frame_stack; d != NULL; d = d->next)
if (d->dtor == dtor && d->dtor_data == dtor_data)
return 1;
return 0;
}
/* There may be stale dummy frames, perhaps left over from when an uncaught
longjmp took us out of a function that was called by the debugger. Clean
them up at least once whenever we start a new inferior. */