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| author | emaste <emaste@FreeBSD.org> | 2012-11-13 03:05:28 +0000 |
|---|---|---|
| committer | emaste <emaste@FreeBSD.org> | 2012-11-13 03:05:28 +0000 |
| commit | 8ec2223d5f26a8b21c79696a9b36ea01aca4ef57 (patch) | |
| tree | cd71e982c2718a953e7f5ae5050c1733ebbbeca6 /contrib/gdb | |
| parent | ff7333d33fdab4dc0e6809f8e70bdf82e2ed4637 (diff) | |
| download | FreeBSD-src-8ec2223d5f26a8b21c79696a9b36ea01aca4ef57.zip FreeBSD-src-8ec2223d5f26a8b21c79696a9b36ea01aca4ef57.tar.gz | |
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 <cagney@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
Diffstat (limited to 'contrib/gdb')
| -rw-r--r-- | contrib/gdb/gdb/frame.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/frame.c b/contrib/gdb/gdb/frame.c index a032c47..3650b7c 100644 --- a/contrib/gdb/gdb/frame.c +++ b/contrib/gdb/gdb/frame.c @@ -1846,6 +1846,23 @@ get_prev_frame (struct frame_info *this_frame) 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) { |
