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* malloc/malloc.c (MALLOC_ALIGNMENT): Revert to (2 * SIZE_SZ) value.

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The correct value differs only on powerpc32, and for now changing it
	there is causing more trouble than it's worth.

	* malloc/arena.c: Add compile-time sanity check on padding calculation.

2006-03-05  Jakub Jelinek  <jakub@redhat.com>

	* malloc/arena.c (heap_info): Adjust the padding size if
	MALLOC_ALIGNMENT > 2 * SIZE_SZ.
This commit is contained in:
Roland McGrath 2006-03-06 06:18:43 +00:00
parent 182ed12e71
commit 7d013a64de
4 changed files with 36 additions and 7 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2006-03-05 Roland McGrath <roland@redhat.com>
* malloc/malloc.c (MALLOC_ALIGNMENT): Revert to (2 * SIZE_SZ) value.
The correct value differs only on powerpc32, and for now changing it
there is causing more trouble than it's worth.
* malloc/arena.c: Add compile-time sanity check on padding calculation.
2006-03-05 Jakub Jelinek <jakub@redhat.com>
* malloc/arena.c (heap_info): Adjust the padding size if
MALLOC_ALIGNMENT > 2 * SIZE_SZ.
2006-03-05 Roland McGrath <roland@frob.com>
* sysdeps/posix/sysconf.c (__sysconf): Use #if _POSIX_FOO > 0

13
malloc/arena.c
View File

@ -1,5 +1,5 @@
/* Malloc implementation for multiple threads without lock contention.
Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Copyright (C) 2001,2002,2003,2004,2005,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Wolfram Gloger <wg@malloc.de>, 2001.
@ -55,9 +55,18 @@ typedef struct _heap_info {
mstate ar_ptr; /* Arena for this heap. */
struct _heap_info *prev; /* Previous heap. */
size_t size; /* Current size in bytes. */
size_t pad; /* Make sure the following data is properly aligned. */
/* Make sure the following data is properly aligned, particularly
that sizeof (heap_info) + 2 * SIZE_SZ is a multiple of
MALLOG_ALIGNMENT. */
char pad[-5 * SIZE_SZ & MALLOC_ALIGN_MASK];
} heap_info;
/* Get a compile-time error if the heap_info padding is not correct
to make alignment work as expected in sYSMALLOc. */
extern int sanity_check_heap_info_alignment[(sizeof (heap_info)
+ 2 * SIZE_SZ) % MALLOC_ALIGNMENT
? -1 : 1];
/* Thread specific data */
static tsd_key_t arena_key;

9
malloc/malloc.c
View File

@ -1,5 +1,5 @@
/* Malloc implementation for multiple threads without lock contention.
Copyright (C) 1996-2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Copyright (C) 1996-2002,2003,2004,2005,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Wolfram Gloger <wg@malloc.de>
and Doug Lea <dl@cs.oswego.edu>, 2001.
@ -381,8 +381,15 @@ extern "C" {
#ifndef MALLOC_ALIGNMENT
/* XXX This is the correct definition. It differs from 2*SIZE_SZ only on
powerpc32. For the time being, changing this is causing more
compatibility problems due to malloc_get_state/malloc_set_state than
will returning blocks not adequately aligned for long double objects
under -mlong-double-128. */
#define MALLOC_ALIGNMENT (2 * SIZE_SZ < __alignof__ (long double) \
? __alignof__ (long double) : 2 * SIZE_SZ)
*/
#define MALLOC_ALIGNMENT (2 * SIZE_SZ)
#endif
/* The corresponding bit mask value */

8
sysdeps/posix/sysconf.c
View File

@ -816,25 +816,25 @@ __sysconf (name)
#endif
case _SC_V6_ILP32_OFF32:
#if _POSIX_V6_ILP32_OFF32 > 0
#ifdef _POSIX_V6_ILP32_OFF32
return _POSIX_V6_ILP32_OFF32;
#else
return __sysconf_check_spec ("ILP32_OFF32");
#endif
case _SC_V6_ILP32_OFFBIG:
#if _POSIX_V6_ILP32_OFFBIG > 0
#ifdef _POSIX_V6_ILP32_OFFBIG
return _POSIX_V6_ILP32_OFFBIG;
#else
return __sysconf_check_spec ("ILP32_OFFBIG");
#endif
case _SC_V6_LP64_OFF64:
#if _POSIX_V6_LP64_OFF64 > 0
#ifdef _POSIX_V6_LP64_OFF64
return _POSIX_V6_LP64_OFF64;
#else
return __sysconf_check_spec ("LP64_OFF64");
#endif
case _SC_V6_LPBIG_OFFBIG:
#if _POSIX_V6_LPBIG_OFFBIG > 0
#ifdef _POSIX_V6_LPBIG_OFFBIG
return _POSIX_V6_LPBIG_OFFBIG;
#else
return __sysconf_check_spec ("LPBIG_OFFBIG");