Author: emaste
Date: Tue Nov 13 03:05:28 2012
New Revision: 242943
URL: http://svnweb.freebsd.org/changeset/base/242943
Log:
Do not unwind past a zero PC frame.
This improves GDB usability when debugging code compiled with
optimization.
Upstream GDB revision f0031b6d3ae9b164b3747986ab898190bd4dcf8c (prior
to GDB's switch to GPLv3), with frame_debug_got_null_frame expanded
inline.
| 2004-12-12 Andrew Cagney <cag...@gnu.org>
|
| * frame.c (get_prev_frame): When unwinding normal frames, check
| that the PC isn't zero.
Sponsored by: ADARA Networks
MFC After: 1 month
Modified:
head/contrib/gdb/gdb/frame.c
Modified: head/contrib/gdb/gdb/frame.c
==============================================================================
--- head/contrib/gdb/gdb/frame.c Tue Nov 13 03:00:01 2012
(r242942)
+++ head/contrib/gdb/gdb/frame.c Tue Nov 13 03:05:28 2012
(r242943)
@@ -1846,6 +1846,23 @@ get_prev_frame (struct frame_info *this_
return NULL;
}
+ /* Assume that the only way to get a zero PC is through something
+ like a SIGSEGV or a dummy frame, and hence that NORMAL frames
+ will never unwind a zero PC. */
+ if (this_frame->level > 0
+ && get_frame_type (this_frame) == NORMAL_FRAME
+ && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME
+ && get_frame_pc (this_frame) == 0)
+ {
+ if (frame_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog, "-> ");
+ fprint_frame (gdb_stdlog, this_frame->prev);
+ fprintf_unfiltered (gdb_stdlog, " // zero PC \n");
+ }
+ return NULL;
+ }
+
/* Only try to do the unwind once. */
if (this_frame->prev_p)
{
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