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

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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.
This commit is contained in:
Andrew Cagney 2002-04-10 22:14:02 +00:00
parent 67a2b77eff
commit 7cc19214aa
4 changed files with 63 additions and 6 deletions
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10
gdb/ChangeLog
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@ -1,3 +1,13 @@
2002-04-10 Andrew Cagney <ac131313@redhat.com>
* 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.
2002-04-10 Andrew Cagney <ac131313@redhat.com>
* maint.c (maint_print_section_info): Rename print_section_info.

11
gdb/blockframe.c
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@ -1,7 +1,9 @@
/* Get info from stack frames;
convert between frames, blocks, functions and pc values.
Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
/* Get info from stack frames; convert between frames, blocks,
functions and pc values.
Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
Foundation, Inc.
This file is part of GDB.
@ -393,6 +395,7 @@ get_prev_frame (struct frame_info *next_frame)
next_frame->prev = prev;
prev->next = next_frame;
prev->frame = address;
prev->level = next_frame->level + 1;
/* This change should not be needed, FIXME! We should
determine whether any targets *need* INIT_FRAME_PC to happen

16
gdb/frame.h
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@ -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

32
gdb/stack.c
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@ -1458,6 +1458,38 @@ select_frame (struct frame_info *fi, int level)
selected_frame = fi;
selected_frame_level = level;
/* FIXME: cagney/2002-04-05: It can't be this easy (and looking at
the increasingly complex list of checkes, it wasn't)! GDB is
dragging around, and constantly updating, the global variable
selected_frame_level. Surely all that was needed was for the
level to be computed direct from the frame (by counting back to
the inner-most frame) or, as has been done here using a cached
value. For moment, check that the expected and the actual level
are consistent. If, after a few weeks, no one reports that this
assertion has failed, the global selected_frame_level and many
many parameters can all be deleted. */
if (fi == NULL && level == -1)
/* Ok. The target is clearing the selected frame as part of a
cache flush. */
;
else if (fi != NULL && fi->level == level)
/* Ok. What you would expect. Level is redundant. */
;
else if (fi != NULL && level == -1)
/* Ok. See breakpoint.c. The watchpoint code changes the
selected frame to the frame that contains the watchpoint and
then, later changes it back to the old value. The -1 is used
as a marker so that the watchpoint code can easily detect that
things are not what they should be. Why the watchpoint code
can't mindlessly save/restore the selected frame I don't know,
hopefully it can be simplified that way. Hopefully the global
selected_frame can be replaced by a frame parameter, making
still more simplification possible. */
;
else
internal_error (__FILE__, __LINE__,
"oops! fi=0x%p, fi->level=%d, level=%d",
fi, fi ? fi->level : -1, level);
if (selected_frame_level_changed_hook)
selected_frame_level_changed_hook (level);