From 928a5ba9911db75442f9dfad5ca477db38f0f7fe Mon Sep 17 00:00:00 2001
From: Joseph Myers <jsm@polyomino.org.uk>
Date: Sun, 4 Jan 2004 20:37:52 +0000
Subject: [PATCH] re PR c/3414 (Inaccurate documentation of
__attribute__((malloc)))
PR c/3414
* doc/extend.texi: Clarify definition of malloc attribute.
From-SVN: r75395
---
gcc/ChangeLog | 5 +++++
gcc/doc/extend.texi | 11 ++++++++---
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a1b09c01db3f..f37704cbb821 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2004-01-04 Joseph S. Myers <jsm@polyomino.org.uk>
+
+ PR c/3414
+ * doc/extend.texi: Clarify definition of malloc attribute.
+
2004-01-04 Jan Hubicka <jh@suse.cz>
* Makefile.in (cgraph.o, cgraphunit.o): Add intl.h dependency.
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index ac038554b9ab..abd841501bf2 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -1,4 +1,4 @@
-@c Copyright (C) 1988,1989,1992,1993,1994,1996,1998,1999,2000,2001,2002, 2003
+@c Copyright (C) 1988,1989,1992,1993,1994,1996,1998,1999,2000,2001,2002,2003,2004
@c Free Software Foundation, Inc.
@c This is part of the GCC manual.
@c For copying conditions, see the file gcc.texi.
@@ -2355,9 +2355,14 @@ and linker.
@item malloc
@cindex @code{malloc} attribute
The @code{malloc} attribute is used to tell the compiler that a function
-may be treated as if it were the malloc function. The compiler assumes
-that calls to malloc result in pointers that cannot alias anything.
+may be treated as if any non-@code{NULL} pointer it returns cannot
+alias any other pointer valid when the function returns.
This will often improve optimization.
+Standard functions with this property include @code{malloc} and
+@code{calloc}. @code{realloc}-like functions have this property as
+long as the old pointer is never referred to (including comparing it
+to the new pointer) after the function returns a non-@code{NULL}
+value.
@item alias ("@var{target}")
@cindex @code{alias} attribute
--
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