* stack.c (select_frame): Check that selected_frame and the

specified level are as expected.
* blockframe.c (get_prev_frame): Set the `level' from next_frame.
Update copyright.
* frame.h (struct frame_info): Add field `level'.  Update
copyright.
Work-in-progress PR gdb/464.

1 files changed, 14 insertions, 2 deletions

diff --git a/gdb/frame.h b/gdb/frame.h
index 5f952c5..a989890 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -1,6 +1,7 @@
 /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
-   Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997,
-   1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+
+   Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996,
+   1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -63,6 +64,17 @@ struct frame_info
        For other frames, it is a pc saved in the next frame.  */
     CORE_ADDR pc;
 
+    /* Level of this frame.  The inner-most (youngest) frame is at
+       level 0.  As you move towards the outer-most (oldest) frame,
+       the level increases.  This is a cached value.  It could just as
+       easily be computed by counting back from the selected frame to
+       the inner most frame.  */
+    /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
+       reserved to indicate a bogus frame - one that has been created
+       just to keep GDB happy (GDB always needs a frame).  For the
+       moment leave this as speculation.  */
+    int level;
+
     /* Nonzero if this is a frame associated with calling a signal handler.
 
        Set by machine-dependent code.  On some machines, if