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Date: Sun, 16 May 2010 17:31:00 -0000
From: Jan Kratochvil <jan.kratochvil@redhat.com>
To: Joost van der Sluis <joost@cnoc.nl>
Cc: Jonas Maebe <jonas.maebe@elis.ugent.be>,
        Project Archer <archer@sourceware.org>
Subject: Re: Patch for pascal-dynamic arrays
Message-ID: <20100516172301.GA4685@host0.dyn.jankratochvil.net>
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On Sun, 16 May 2010 19:04:27 +0200, Joost van der Sluis wrote:
> That's because type_length_get() (gdbtypes.c) does not return 0 when the
> high and low-bound are equal to each other.

That's correct.  Both DW_AT_lower_bound and DW_AT_upper_bound express the
boundaries inclusively.  Array of length 0 must have DW_AT_upper_bound equal
to DW_AT_lower_bound minus one.

If you do not feel confortable with DW_AT_upper_bound that way you can also
use DW_AT_lower_bound and DW_AT_count with value 0.

> There's also a second problem. The lower bound is 1 for strings. With
> Jonas' patch for fpc the upper bound of strings is 0 when not allocated.

That looks correct.

> Leading to a size of -1.

That should lead to a size of 0.

I am not sure where is a problem there but GDB handles non-pascal arrays of
length zero right AFAIK.


Thanks,
Jan