diff options
Diffstat (limited to 'tests/xalloc.h')
| -rw-r--r-- | tests/xalloc.h | 151 |
1 files changed, 84 insertions, 67 deletions
diff --git a/tests/xalloc.h b/tests/xalloc.h index 81ef680..6122cc5 100644 --- a/tests/xalloc.h +++ b/tests/xalloc.h @@ -1,6 +1,8 @@ /* xalloc.h -- malloc with out-of-memory checking - Copyright (C) 1990-2000, 2003-2004, 2006-2015 Free Software Foundation, Inc. + Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, + 2000, 2003, 2004, 2006, 2007, 2008, 2009, 2010 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 @@ -16,58 +18,64 @@ 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" -#ifndef _GL_INLINE_HEADER_BEGIN - #error "Please include config.h first." -#endif -_GL_INLINE_HEADER_BEGIN -#ifndef XALLOC_INLINE -# define XALLOC_INLINE _GL_INLINE -#endif - -#ifdef __cplusplus +# ifdef __cplusplus extern "C" { -#endif +# endif + +# ifndef __attribute__ +# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) +# define __attribute__(x) +# endif +# endif -#if __GNUC__ >= 3 -# define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) -#else -# define _GL_ATTRIBUTE_MALLOC -#endif +# ifndef ATTRIBUTE_NORETURN +# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) +# endif -#if ! defined __clang__ && \ - (__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 +# ifndef ATTRIBUTE_MALLOC +# if __GNUC__ >= 3 +# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__)) +# else +# define ATTRIBUTE_MALLOC +# endif +# 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 _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)); +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); void *x2realloc (void *p, size_t *pn); -void *xmemdup (void const *p, size_t s) - _GL_ATTRIBUTE_ALLOC_SIZE ((2)); -char *xstrdup (char const *str) - _GL_ATTRIBUTE_MALLOC; +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)) + /* 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 @@ -76,31 +84,41 @@ char *xstrdup (char const *str) /* 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. */ -XALLOC_INLINE void *xnmalloc (size_t n, size_t s) - _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1, 2)); -XALLOC_INLINE void * +static_inline void *xnmalloc (size_t n, size_t s) ATTRIBUTE_MALLOC; +static_inline void * xnmalloc (size_t n, size_t s) { if (xalloc_oversized (n, s)) @@ -111,9 +129,7 @@ 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. */ -XALLOC_INLINE void *xnrealloc (void *p, size_t n, size_t s) - _GL_ATTRIBUTE_ALLOC_SIZE ((2, 3)); -XALLOC_INLINE void * +static_inline void * xnrealloc (void *p, size_t n, size_t s) { if (xalloc_oversized (n, s)) @@ -123,9 +139,10 @@ xnrealloc (void *p, size_t n, size_t s) /* If P is null, allocate a block of at least *PN such objects; otherwise, reallocate P so that it contains more than *PN objects - each of S bytes. S must be nonzero. Set *PN to the new number of - objects, and return the pointer to the new block. *PN is never set - to zero, and the returned pointer is never null. + each of S bytes. *PN must be nonzero unless P is null, and S must + be nonzero. Set *PN to the new number of objects, and return the + pointer to the new block. *PN is never set to zero, and the + returned pointer is never null. Repeated reallocations are guaranteed to make progress, either by allocating an initial block with a nonzero size, or by allocating a @@ -175,7 +192,7 @@ xnrealloc (void *p, size_t n, size_t s) */ -XALLOC_INLINE void * +static_inline void * x2nrealloc (void *p, size_t *pn, size_t s) { size_t n = *pn; @@ -186,9 +203,9 @@ 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. This is the largest "small" request for the GNU C - library malloc. */ - enum { DEFAULT_MXFAST = 64 * sizeof (size_t) / 4 }; + zero. 64 bytes is the largest "small" request for the + GNU C library malloc. */ + enum { DEFAULT_MXFAST = 64 }; n = DEFAULT_MXFAST / s; n += !n; @@ -196,13 +213,13 @@ x2nrealloc (void *p, size_t *pn, size_t s) } else { - /* Set N = floor (1.5 * N) + 1 so that progress is made even if N == 0. + /* Set N = ceil (1.5 * N) so that progress is made if N == 1. Check for overflow, so that N * S stays in size_t range. - The check may be slightly conservative, but an exact check isn't + The check is slightly conservative, but an exact check isn't worth the trouble. */ if ((size_t) -1 / 3 * 2 / s <= n) xalloc_die (); - n += n / 2 + 1; + n += (n + 1) / 2; } *pn = n; @@ -212,15 +229,16 @@ 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 *. */ -XALLOC_INLINE char *xcharalloc (size_t n) - _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1)); -XALLOC_INLINE char * +static_inline char *xcharalloc (size_t n) ATTRIBUTE_MALLOC; +static_inline char * xcharalloc (size_t n) { return XNMALLOC (n, char); } -#ifdef __cplusplus +# endif + +# ifdef __cplusplus } /* C++ does not allow conversions from void * to other pointer types @@ -257,8 +275,7 @@ xmemdup (T const *p, size_t s) return (T *) xmemdup ((void const *) p, s); } -#endif +# endif -_GL_INLINE_HEADER_END #endif /* !XALLOC_H_ */ |