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Message-ID: <20130114150224.GV4468@port70.net>
Date: Mon, 14 Jan 2013 16:02:24 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: musl as a framework to test applications' compatibility
with POSIX (was: NULL)
* Vasily Kulikov <segoon@...nwall.com> [2013-01-14 18:30:25 +0400]:
>
> 1) on each call of a variadic function save the list of all types
> 2) on each call to va_arg(ap, T) check whether the current argument was
> pushed as T in the saved list
>
> It would catch not only NULL/(void *)NULL, but also int/long or
> void*/long bugs.
>
> Now I see that while it is possible to implement (2) in libc redefining
> va_XXX() macros, but it looks like (1) has to be implemented in compiler.
>
this is what i mean when i wrote 'instrumentation tool' earlier
and it can be probably done in asan if it's not already there
and i agree with
#define NULL 0L
it is a valid definition for c and c++
and it does not cause unexpected failures in broken code
the only drawback i see is that some trivial errors are
not catched by the type checker in c with this definition
(using NULL in int/arithmetic context), but that's not a
big loss probably
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