NEWS.stable: update

[gnulib.git] / lib / malloca.h

diff --git a/lib/malloca.h b/lib/malloca.h
index 2bf8501..6b38582 100644 (file)
--- a/lib/malloca.h
+++ b/lib/malloca.h
@@ -1,5 +1,5 @@
 /* Safe automatic memory allocation.
-   Copyright (C) 2003-2007, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2003-2007, 2009-2014 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2003.
 
    This program is free software; you can redistribute it and/or modify
@@ -13,8 +13,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
 
 #ifndef _MALLOCA_H
 #define _MALLOCA_H
@@ -23,8 +22,6 @@
 #include <stddef.h>
 #include <stdlib.h>
 
-#include "alignof.h"
-
 
 #ifdef __cplusplus
 extern "C" {
@@ -45,7 +42,7 @@ extern "C" {
    and a page size can be as small as 4096 bytes.  So we cannot safely
    allocate anything larger than 4096 bytes.  Also care for the possibility
    of a few compiler-allocated temporary stack slots.
-   This must be a macro, not an inline function.  */
+   This must be a macro, not a function.  */
 # define safe_alloca(N) ((N) < 4032 ? alloca (N) : NULL)
 #else
 # define safe_alloca(N) ((void) (N), NULL)
@@ -56,7 +53,7 @@ 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
@@ -94,22 +91,40 @@ extern void * nmalloca (size_t n, size_t s);
 
 /* ------------------- Auxiliary, non-public definitions ------------------- */
 
+/* Determine the alignment of a type at compile time.  */
+#if defined __GNUC__ || defined __IBM__ALIGNOF__
+# 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