diff options
Diffstat (limited to 'gdb/frame.c')
| -rw-r--r-- | gdb/frame.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/gdb/frame.c b/gdb/frame.c index 85de9b8..5c52ed1 100644 --- a/gdb/frame.c +++ b/gdb/frame.c @@ -28,6 +28,56 @@ #include "regcache.h" #include "gdb_assert.h" +/* Return a frame uniq ID that can be used to, later re-find the + frame. */ + +void +get_frame_id (struct frame_info *fi, struct frame_id *id) +{ + if (fi == NULL) + { + id->base = 0; + id->pc = 0; + } + else + { + id->base = FRAME_FP (fi); + id->pc = fi->pc; + } +} + +struct frame_info * +frame_find_by_id (struct frame_id id) +{ + struct frame_info *frame; + + /* ZERO denotes the null frame, let the caller decide what to do + about it. Should it instead return get_current_frame()? */ + if (id.base == 0 && id.pc == 0) + return NULL; + + for (frame = get_current_frame (); + frame != NULL; + frame = get_prev_frame (frame)) + { + if (INNER_THAN (FRAME_FP (frame), id.base)) + /* ``inner/current < frame < id.base''. Keep looking along + the frame chain. */ + continue; + if (INNER_THAN (id.base, FRAME_FP (frame))) + /* ``inner/current < id.base < frame''. Oops, gone past it. + Just give up. */ + return NULL; + /* FIXME: cagney/2002-04-21: This isn't sufficient. It should + use id.pc to check that the two frames belong to the same + function. Otherwise we'll do things like match dummy frames + or mis-match frameless functions. However, until someone + notices, stick with the existing behavour. */ + return frame; + } + return NULL; +} + /* FIND_SAVED_REGISTER () Return the address in which frame FRAME's value of register REGNUM |