diff options
Diffstat (limited to 'gl/xalloc.h')
| -rw-r--r-- | gl/xalloc.h | 133 |
1 files changed, 56 insertions, 77 deletions
diff --git a/gl/xalloc.h b/gl/xalloc.h index 6122cc58..da7c4b6b 100644 --- a/gl/xalloc.h +++ b/gl/xalloc.h @@ -1,8 +1,6 @@ /* xalloc.h -- malloc with out-of-memory checking - Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, - 2000, 2003, 2004, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, - Inc. + Copyright (C) 1990-2000, 2003-2004, 2006-2013 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -18,64 +16,54 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef XALLOC_H_ -# define XALLOC_H_ +#define XALLOC_H_ -# include <stddef.h> +#include <stddef.h> +#include "xalloc-oversized.h" -# ifdef __cplusplus -extern "C" { -# endif +_GL_INLINE_HEADER_BEGIN +#ifndef XALLOC_INLINE +# define XALLOC_INLINE _GL_INLINE +#endif +#ifdef __cplusplus +extern "C" { +#endif -# ifndef __attribute__ -# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) -# define __attribute__(x) -# endif -# endif -# ifndef ATTRIBUTE_NORETURN -# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) -# endif +#if __GNUC__ >= 3 +# define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) +#else +# define _GL_ATTRIBUTE_MALLOC +#endif -# ifndef ATTRIBUTE_MALLOC -# if __GNUC__ >= 3 -# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) -# else -# define ATTRIBUTE_MALLOC -# endif -# endif +#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) +# define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args)) +#else +# define _GL_ATTRIBUTE_ALLOC_SIZE(args) +#endif /* This function is always triggered when memory is exhausted. It must be defined by the application, either explicitly or by using gnulib's xalloc-die module. This is the function to call when one wants the program to die because of a memory allocation failure. */ -extern void xalloc_die (void) ATTRIBUTE_NORETURN; - -void *xmalloc (size_t s) ATTRIBUTE_MALLOC; -void *xzalloc (size_t s) ATTRIBUTE_MALLOC; -void *xcalloc (size_t n, size_t s) ATTRIBUTE_MALLOC; -void *xrealloc (void *p, size_t s); +extern _Noreturn void xalloc_die (void); + +void *xmalloc (size_t s) + _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1)); +void *xzalloc (size_t s) + _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1)); +void *xcalloc (size_t n, size_t s) + _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2)); +void *xrealloc (void *p, size_t s) + _GL_ATTRIBUTE_ALLOC_SIZE ((2)); void *x2realloc (void *p, size_t *pn); -void *xmemdup (void const *p, size_t s) ATTRIBUTE_MALLOC; -char *xstrdup (char const *str) ATTRIBUTE_MALLOC; - -/* Return 1 if an array of N objects, each of size S, cannot exist due - to size arithmetic overflow. S must be positive and N must be - nonnegative. This is a macro, not an inline function, so that it - works correctly even when SIZE_MAX < N. - - By gnulib convention, SIZE_MAX represents overflow in size - calculations, so the conservative dividend to use here is - SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value. - However, malloc (SIZE_MAX) fails on all known hosts where - sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for - exactly-SIZE_MAX allocations on such hosts; this avoids a test and - branch when S is known to be 1. */ -# define xalloc_oversized(n, s) \ - ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n)) - +void *xmemdup (void const *p, size_t s) + _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((2)); +char *xstrdup (char const *str) + _GL_ATTRIBUTE_MALLOC; /* In the following macros, T must be an elementary or structure/union or typedef'ed type, or a pointer to such a type. To apply one of the @@ -84,41 +72,31 @@ char *xstrdup (char const *str) ATTRIBUTE_MALLOC; /* Allocate an object of type T dynamically, with error checking. */ /* extern t *XMALLOC (typename t); */ -# define XMALLOC(t) ((t *) xmalloc (sizeof (t))) +#define XMALLOC(t) ((t *) xmalloc (sizeof (t))) /* Allocate memory for N elements of type T, with error checking. */ /* extern t *XNMALLOC (size_t n, typename t); */ -# define XNMALLOC(n, t) \ - ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t)))) +#define XNMALLOC(n, t) \ + ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t)))) /* Allocate an object of type T dynamically, with error checking, and zero it. */ /* extern t *XZALLOC (typename t); */ -# define XZALLOC(t) ((t *) xzalloc (sizeof (t))) +#define XZALLOC(t) ((t *) xzalloc (sizeof (t))) /* Allocate memory for N elements of type T, with error checking, and zero it. */ /* extern t *XCALLOC (size_t n, typename t); */ -# define XCALLOC(n, t) \ - ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t)))) - +#define XCALLOC(n, t) \ + ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t)))) -# if HAVE_INLINE -# define static_inline static inline -# else -void *xnmalloc (size_t n, size_t s) ATTRIBUTE_MALLOC; -void *xnrealloc (void *p, size_t n, size_t s); -void *x2nrealloc (void *p, size_t *pn, size_t s); -char *xcharalloc (size_t n) ATTRIBUTE_MALLOC; -# endif - -# ifdef static_inline /* Allocate an array of N objects, each with S bytes of memory, dynamically, with error checking. S must be nonzero. */ -static_inline void *xnmalloc (size_t n, size_t s) ATTRIBUTE_MALLOC; -static_inline void * +XALLOC_INLINE void *xnmalloc (size_t n, size_t s) + _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2)); +XALLOC_INLINE void * xnmalloc (size_t n, size_t s) { if (xalloc_oversized (n, s)) @@ -129,7 +107,9 @@ xnmalloc (size_t n, size_t s) /* Change the size of an allocated block of memory P to an array of N objects each of S bytes, with error checking. S must be nonzero. */ -static_inline void * +XALLOC_INLINE void *xnrealloc (void *p, size_t n, size_t s) + _GL_ATTRIBUTE_ALLOC_SIZE ((2, 3)); +XALLOC_INLINE void * xnrealloc (void *p, size_t n, size_t s) { if (xalloc_oversized (n, s)) @@ -192,7 +172,7 @@ xnrealloc (void *p, size_t n, size_t s) */ -static_inline void * +XALLOC_INLINE void * x2nrealloc (void *p, size_t *pn, size_t s) { size_t n = *pn; @@ -203,9 +183,9 @@ x2nrealloc (void *p, size_t *pn, size_t s) { /* The approximate size to use for initial small allocation requests, when the invoking code specifies an old size of - zero. 64 bytes is the largest "small" request for the - GNU C library malloc. */ - enum { DEFAULT_MXFAST = 64 }; + zero. This is the largest "small" request for the GNU C + library malloc. */ + enum { DEFAULT_MXFAST = 64 * sizeof (size_t) / 4 }; n = DEFAULT_MXFAST / s; n += !n; @@ -229,16 +209,15 @@ x2nrealloc (void *p, size_t *pn, size_t s) /* Return a pointer to a new buffer of N bytes. This is like xmalloc, except it returns char *. */ -static_inline char *xcharalloc (size_t n) ATTRIBUTE_MALLOC; -static_inline char * +XALLOC_INLINE char *xcharalloc (size_t n) + _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1)); +XALLOC_INLINE char * xcharalloc (size_t n) { return XNMALLOC (n, char); } -# endif - -# ifdef __cplusplus +#ifdef __cplusplus } /* C++ does not allow conversions from void * to other pointer types @@ -275,7 +254,7 @@ xmemdup (T const *p, size_t s) return (T *) xmemdup ((void const *) p, s); } -# endif +#endif #endif /* !XALLOC_H_ */ |