Re: c/5448: gcc emits internal error (unrecognized insn)

[Craig Rodrigues <rodrigc@mediaone.net>]

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The following reply was made to PR c/5448; it has been noted by GNATS.

From: Craig Rodrigues <rodrigc@mediaone.net>
To: gcc-gnats@gcc.gnu.org
Cc: gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Subject: Re: c/5448: gcc emits internal error (unrecognized insn)
Date: Tue, 22 Jan 2002 01:37:38 -0500

 ----- Forwarded message from Olivier Jolly <ojolly@caramail.com> -----
 
 Delivered-To: rodrigc@gcc.gnu.org
 Posted-Date: Tue, 22 Jan 2002 07:24:29 +0100 (MET)
 From: Olivier Jolly <ojolly@caramail.com>
 To: rodrigc@gcc.gnu.org
 X-Mailer: Caramail - www.caramail.com
 X-Originating-IP: [80.11.125.56]
 Subject: Re[1] c/5448: gcc emits internal error (unrecognized insn)
 Date: Tue, 22 Jan 2002 07:24:29 GMT+1
 
 > Synopsis: gcc emits internal error (unrecognized insn)
 > 
 > State-Changed-From-To: open->analyzed
 > State-Changed-By: rodrigc
 > State-Changed-When: Mon Jan 21 16:54:04 2002
 > State-Changed-Why:
 > Crash reproduced on gcc 3.0.3 and gcc 3.1 mainline.
 > 
 > The line which is causing the problem is:
 > 
 > section[pWrd - sCfgFileLine - 1] = '\0'; 
 > 
 > where the variables are:
 > char *section;
 > char *pWrd;
 > char sCfgFileLine[8192];
 > 
 > What exactly are you trying to do in this piece of
 > code? The compiler should not crash, but this code
 > looks suspect.
 
 thanks for your quick reply,
  this piece of code is code to recognize section declaration. It follows the following regex :
 ^\[(.*)\].*$
 
  pWrd is normally a pointer toward the ']' character inside the sCfgFileLine buffer. So, pWrd - sCfgFileLine - 1 should represent the actual size of the inner string, enclosed with brackets since it's the difference of 2 char*. The problematic line then should simply put a '\0' at the end of the freshly (re) allocated section variable.
  note: the very same expression is used on the line above without problem (	 strncpy( section, sCfgFileLine + 1, pWrd - sCfgFileLine - 1);) it's as array index that it causes problem.
  
 I hope it will help making gcc even greater. Thanks for all and good luck
 
  regards
 
  Olivier Jolly
 
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