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authorMarkus Metzger <markus.t.metzger@intel.com>2016-05-31 09:03:15 +0200
committerMarkus Metzger <markus.t.metzger@intel.com>2016-06-01 11:14:02 +0200
commite3b5daf9f735999259c5a8f68b422850c59897e5 (patch)
tree240a55afba83e89b38678d33373d27d9c8920be0 /gdb/infcmd.c
parent03d73f1fd9d89d89bdd021cad26693e4f6abc07a (diff)
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infcmd, btrace: fix crash in 'finish' for tailcall-only frames
Patch 7eb895307f53 Skip unwritable frames in command "finish" skips non-writable frames in addition to tailcall frames. If skip_tailcall_frames already returns NULL, skip_unwritable_frames will be called with a NULL frame and crash in get_frame_arch. This is caught by gdb.btrace/tailcall-only.exp. Further, if we ever end up with a mixture of tailcall and non-writable frames, we may not skip all of them, as intended. Loop over skip_tailcall_frames and skip_unwritable_frames as long as at least one of them makes progress. gdb/ * infcmd.c (skip_finish_frames): New. (finish_command): Call skip_finish_frames.
Diffstat (limited to 'gdb/infcmd.c')
-rw-r--r--gdb/infcmd.c30
1 files changed, 25 insertions, 5 deletions
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 14d51fd..1defb13 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -1927,6 +1927,30 @@ finish_forward (struct finish_command_fsm *sm, struct frame_info *frame)
proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT);
}
+/* Skip frames for "finish". */
+
+static struct frame_info *
+skip_finish_frames (struct frame_info *frame)
+{
+ struct frame_info *start;
+
+ do
+ {
+ start = frame;
+
+ frame = skip_tailcall_frames (frame);
+ if (frame == NULL)
+ break;
+
+ frame = skip_unwritable_frames (frame);
+ if (frame == NULL)
+ break;
+ }
+ while (start != frame);
+
+ return frame;
+}
+
/* "finish": Set a temporary breakpoint at the place the selected
frame will return to, then continue. */
@@ -2025,11 +2049,7 @@ finish_command (char *arg, int from_tty)
finish_backward (sm);
else
{
- /* Ignore TAILCALL_FRAME type frames, they were executed already before
- entering THISFRAME. */
- frame = skip_tailcall_frames (frame);
-
- frame = skip_unwritable_frames (frame);
+ frame = skip_finish_frames (frame);
if (frame == NULL)
error (_("Cannot find the caller frame."));