/* Safe automatic memory allocation.
- Copyright (C) 2003-2007, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2003-2007, 2009-2010 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2003.
This program is free software; you can redistribute it and/or modify
#include <stddef.h>
#include <stdlib.h>
-#include "alignof.h"
-
#ifdef __cplusplus
extern "C" {
the function returns. Upon failure, it returns NULL. */
#if HAVE_ALLOCA
# define malloca(N) \
- ((N) < 4032 - sa_increment \
+ ((N) < 4032 - sa_increment \
? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \
: mmalloca (N))
#else
/* ------------------- Auxiliary, non-public definitions ------------------- */
+/* Determine the alignment of a type at compile time. */
+#if defined __GNUC__
+# define sa_alignof __alignof__
+#elif defined __cplusplus
+ template <class type> struct sa_alignof_helper { char __slot1; type __slot2; };
+# define sa_alignof(type) offsetof (sa_alignof_helper<type>, __slot2)
+#elif defined __hpux
+ /* Work around a HP-UX 10.20 cc bug with enums constants defined as offsetof
+ values. */
+# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8)
+#elif defined _AIX
+ /* Work around an AIX 3.2.5 xlc bug with enums constants defined as offsetof
+ values. */
+# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8)
+#else
+# define sa_alignof(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
+#endif
+
enum
{
/* The desired alignment of memory allocations is the maximum alignment
among all elementary types. */
- sa_alignment_long = alignof (long),
- sa_alignment_double = alignof (double),
+ sa_alignment_long = sa_alignof (long),
+ sa_alignment_double = sa_alignof (double),
#if HAVE_LONG_LONG_INT
- sa_alignment_longlong = alignof (long long),
+ sa_alignment_longlong = sa_alignof (long long),
#endif
- sa_alignment_longdouble = alignof (long double),
+ sa_alignment_longdouble = sa_alignof (long double),
sa_alignment_max = ((sa_alignment_long - 1) | (sa_alignment_double - 1)
#if HAVE_LONG_LONG_INT
- | (sa_alignment_longlong - 1)
+ | (sa_alignment_longlong - 1)
#endif
- | (sa_alignment_longdouble - 1)
- ) + 1,
+ | (sa_alignment_longdouble - 1)
+ ) + 1,
/* The increment that guarantees room for a magic word must be >= sizeof (int)
and a multiple of sa_alignment_max. */
sa_increment = ((sizeof (int) + sa_alignment_max - 1) / sa_alignment_max) * sa_alignment_max