* infrun.c (struct inferior_status): Replace fields

[deliverable/binutils-gdb.git] / gdb / frame.c

diff --git a/gdb/frame.c b/gdb/frame.c
index 85de9b83311a2e390699b03c573a4ba6cc690548..5c52ed1a0a2c5e664e26c24e8a3b6b40de87a62c 100644 (file)
--- 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