* frame.c (get_prev_frame_1): Work around GCC bug.
* frame.h: Add comment about GCC bug.
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3 changed files with 26 additions and 6 deletions
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@ -1,3 +1,8 @@
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2004-05-08 Mark Kettenis <kettenis@gnu.org>
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* frame.c (get_prev_frame_1): Work around GCC bug.
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* frame.h: Add comment about GCC bug.
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2004-05-07 Andrew Cagney <cagney@redhat.com>
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* observer.c: Include "commands.h" and "gdbcmd.h".
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10
gdb/frame.c
10
gdb/frame.c
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@ -1609,6 +1609,7 @@ static struct frame_info *
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get_prev_frame_1 (struct frame_info *this_frame)
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{
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struct frame_info *prev_frame;
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struct frame_id this_id;
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gdb_assert (this_frame != NULL);
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@ -1646,7 +1647,8 @@ get_prev_frame_1 (struct frame_info *this_frame)
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/* Check that this frame's ID was valid. If it wasn't, don't try to
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unwind to the prev frame. Be careful to not apply this test to
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the sentinel frame. */
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if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame)))
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this_id = get_frame_id (this_frame);
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if (this_frame->level >= 0 && !frame_id_p (this_id))
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{
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if (frame_debug)
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{
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@ -1663,16 +1665,14 @@ get_prev_frame_1 (struct frame_info *this_frame)
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go backwards) and sentinel frames (the test is meaningless). */
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if (this_frame->next->level >= 0
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&& this_frame->next->type != SIGTRAMP_FRAME
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&& frame_id_inner (get_frame_id (this_frame),
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get_frame_id (this_frame->next)))
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&& frame_id_inner (this_id, get_frame_id (this_frame->next)))
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error ("Previous frame inner to this frame (corrupt stack?)");
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/* Check that this and the next frame are not identical. If they
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are, there is most likely a stack cycle. As with the inner-than
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test above, avoid comparing the inner-most and sentinel frames. */
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if (this_frame->level > 0
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&& frame_id_eq (get_frame_id (this_frame),
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get_frame_id (this_frame->next)))
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&& frame_id_eq (this_id, get_frame_id (this_frame->next)))
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error ("Previous frame identical to this frame (corrupt stack?)");
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/* Allocate the new frame but do not wire it in to the frame chain.
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17
gdb/frame.h
17
gdb/frame.h
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@ -310,7 +310,22 @@ extern CORE_ADDR get_frame_base (struct frame_info *);
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/* Return the per-frame unique identifer. Can be used to relocate a
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frame after a frame cache flush (and other similar operations). If
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FI is NULL, return the null_frame_id. */
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FI is NULL, return the null_frame_id.
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NOTE: kettenis/20040508: These functions return a structure. On
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platforms where structures are returned in static storage (vax,
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m68k), this may trigger compiler bugs in code like:
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if (frame_id_eq (get_frame_id (l), get_frame_id (r)))
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where the return value from the first get_frame_id (l) gets
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overwritten by the second get_frame_id (r). Please avoid writing
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code like this. Use code like:
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struct frame_id id = get_frame_id (l);
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if (frame_id_eq (id, get_frame_id (r)))
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instead, since that avoids the bug. */
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extern struct frame_id get_frame_id (struct frame_info *fi);
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extern struct frame_id frame_unwind_id (struct frame_info *next_frame);
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