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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.
This commit is contained in:
Mark Kettenis
2004-05-07 23:19:14 +00:00
parent 2b4855ab6b
commit 756e95f198
3 changed files with 26 additions and 6 deletions
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17
gdb/frame.h
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@@ -310,7 +310,22 @@ extern CORE_ADDR get_frame_base (struct frame_info *);
/* Return the per-frame unique identifer. Can be used to relocate a
frame after a frame cache flush (and other similar operations). If
FI is NULL, return the null_frame_id. */
FI is NULL, return the null_frame_id.
NOTE: kettenis/20040508: These functions return a structure. On
platforms where structures are returned in static storage (vax,
m68k), this may trigger compiler bugs in code like:
if (frame_id_eq (get_frame_id (l), get_frame_id (r)))
where the return value from the first get_frame_id (l) gets
overwritten by the second get_frame_id (r). Please avoid writing
code like this. Use code like:
struct frame_id id = get_frame_id (l);
if (frame_id_eq (id, get_frame_id (r)))
instead, since that avoids the bug. */
extern struct frame_id get_frame_id (struct frame_info *fi);
extern struct frame_id frame_unwind_id (struct frame_info *next_frame);