From 233a8fb382c88d7faa6da1cd93a7e21b77e36df4 Mon Sep 17 00:00:00 2001 From: Jan Kratochvil Date: Wed, 14 May 2014 14:01:24 -0600 Subject: add dummy frame destructor 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 * dummy-frame.c (struct dummy_frame) : 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. --- gdb/dummy-frame.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) (limited to 'gdb/dummy-frame.c') diff --git a/gdb/dummy-frame.c b/gdb/dummy-frame.c index a13601b..6ca8b19 100644 --- a/gdb/dummy-frame.c +++ b/gdb/dummy-frame.c @@ -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. */ -- cgit v1.1