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From: awdorrin <awdorrin@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Debugging Ada
Date: Wed, 21 Dec 2011 10:43:45 -0800 (PST)
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Date: 2011-12-21T10:43:45-08:00
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On Dec 21, 1:06=A0pm, Simon Wright <si...@pushface.org> wrote:
> awdorrin <awdor...@gmail.com> writes:
> > I can find a location in memory where the filename is stored - but
> > there does not appear to be a 'LAN_CFG_FILE' variable anywhere...
>
> Perhaps if you (temporarily) removed the 'constant'?

GDB appears to be confused when trying to display these variables,
whether the 'constant' tag is there or not.

What we just tried was appending a null to the string:

LAN_CFG_FILE : constant String :=3D SysConfig.Cfg_Filename( LAN_CFG ) &
Ascii.Nul;

When we do this, with or without the 'constant' tag, the
'lan_cfg_file' becomes a variable that can be referenced.

'p lan_cfg_file' gives: $3 =3D   ""
'p &lan_cfg_file' gives: $4 =3D (access array (...) of character)
0xf2aced90

dumping the memory at that location:
'x /2s 0xf2aced90' gives:

 0xf2aced90: "/home/aldorr/prog/data/config/lan1.cfg["00"]"
 0xf2acedb7: "["f7}{"d0"]["la"]["ba"]["f7"]["00"]"

(assuming the second line is just garbage in uninitialized memory)

I'm not entirely sure why GDB is seeing this as an 'access array of
characters' rather than an Ada String, but I'm guessing that is an
artifact of GDB.