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Date: Fri, 21 Dec 2001 18:48:12 +0000
From: Neil Booth <neil AT daikokuya DOT demon DOT co DOT uk>
To: Werner Tuchan <tuwn AT gmx DOT net>, neil AT gcc DOT gnu DOT org, gcc-bugs AT gcc DOT gnu DOT org,
   gcc-gnats AT gcc DOT gnu DOT org, cygwin AT cygwin DOT com
Subject: Re: bootstrap/5149: gcc-20011217 reads beyond EOF on cygwin
Message-ID: <20011221184812.A13959@daikokuya.demon.co.uk>
References: <20011220002004 DOT 23509 DOT qmail AT sources DOT redhat DOT com> <000701c18964$fad2d2e0$fb4d0ed4 AT softron DOT de> <20011220183323 DOT B3065 AT daikokuya DOT demon DOT co DOT uk> <002b01c18a2d$aeb7d850$fb4d0ed4 AT softron DOT de> <20011221172007 DOT GA14954 AT redhat DOT com>
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Christopher Faylor wrote:-

> Can I ask why we'd be reading beyond EOF?  Is it guaranteed that bytes beyond
> EOF will be zero on UNIX?

This was discussed in September (see thread in gcc@ entitled "Bumming
cycles out of parse_identifier").  It was decided that all known
current Unix implementations have zeros until the next page boundary.
Assuming EOF is indicated by a NUL is used as a lexer optimization.

Neil.

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