Re: crasher in dwarf2loc.c

[Michael Snyder <msnyder at redhat dot com>]

Daniel Jacobowitz wrote:
> 
> On Tue, Apr 22, 2003 at 05:50:56PM -0700, Michael Snyder wrote:
> > Hey Daniel,
> >
> > I've got a core dump coming from dwarf_expr_frame_base.
> > First you call get_frame_function, and then you immediately
> > use its return value.  But get_frame_function can return zero,
> > so I think you need to check for zero before using it.
> >
> > Michael
> 
> Just to avoid the crash, you're probably right.
> 
> > PS: more details:  get_frame_block returns zero, because
> > frame_address_in_block returns a pc that is not in any block.
> >
> > The crash occurs while running recurse.exp, when we have a
> > watchpoint on a local variable in an inner frame, and we
> > continue -- so I don't know the exact context; but I'm
> > willing to bet that it is trying to evaluate the local
> > variable after the stack frame has been destroyed.
> 
> Huh - we should not even be reaching this code.  I don't quite
> understand your explanation; what target does this happen?  Can it be
> reproduced on a simulator, or something of that ilk?

mumble, mumble...

[...]

mumble, mumble, mumble...

OK, yes.

But first you have to back out this change: then run recurse.exp.
If it doesn't crash in your target of choice, try h8300-elf (sim).

2003-04-21  Andrew Cagney  <cagney at redhat dot com>

	* frame.c (frame_id_eq): Fail when the code_addr's do not match.

*************** frame_id_eq (struct frame_id l, struct f
*** 295,304 ****
      /* The .stack and .code are identical, the ID's are identical.  */
      eq = 1;
    else
!     /* FIXME: cagney/2003-04-06: This should be zero.  Can't yet do
!        this because most frame ID's are not being initialized
!        correctly.  */
!     eq = 1;
    if (frame_debug)
      {
        fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l=");
--- 295,302 ----
      /* The .stack and .code are identical, the ID's are identical.  */
      eq = 1;
    else
!     /* No luck.  */
!     eq = 0;
    if (frame_debug)
      {
        fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l=");