mozalloc.cpp
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: sw=4 ts=4 et :
*/
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <errno.h>
#include <new> // for std::bad_alloc
#include <string.h>
#include <sys/types.h>
#if defined(MALLOC_H)
# include MALLOC_H // for memalign, valloc where available
#endif // if defined(MALLOC_H)
#include <stddef.h> // for size_t
#include <stdlib.h> // for malloc, free
#if defined(XP_UNIX)
# include <unistd.h> // for valloc on *BSD
#endif //if defined(XP_UNIX)
#if defined(MOZ_MEMORY)
// jemalloc.h doesn't redeclare symbols if they're provided by the OS
# include "jemalloc.h"
#endif
#if defined(XP_WIN) || (defined(XP_OS2) && defined(__declspec))
# define MOZALLOC_EXPORT __declspec(dllexport)
#endif
// Make sure that "malloc" et al. resolve to their libc variants.
#define MOZALLOC_DONT_DEFINE_MACRO_WRAPPERS
#include "mozilla/mozalloc.h"
#include "mozilla/mozalloc_oom.h" // for mozalloc_handle_oom
#if defined(__GNUC__) && (__GNUC__ > 2)
#define LIKELY(x) (__builtin_expect(!!(x), 1))
#define UNLIKELY(x) (__builtin_expect(!!(x), 0))
#else
#define LIKELY(x) (x)
#define UNLIKELY(x) (x)
#endif
#ifdef MOZ_MEMORY_DARWIN
#include "jemalloc.h"
#define malloc(a) je_malloc(a)
#define posix_memalign(a, b, c) je_posix_memalign(a, b, c)
#define valloc(a) je_valloc(a)
#define calloc(a, b) je_calloc(a, b)
#define memalign(a, b) je_memalign(a, b)
#define strdup(a) je_strdup(a)
#define strndup(a, b) je_strndup(a, b)
/* We omit functions which could be passed a memory region that was not
* allocated by jemalloc (realloc, free and malloc_usable_size). Instead,
* we use the system-provided functions, which will in turn call the
* jemalloc versions when appropriate */
#endif
void
moz_free(void* ptr)
{
free(ptr);
}
void*
moz_xmalloc(size_t size)
{
void* ptr = malloc(size);
if (UNLIKELY(!ptr)) {
mozalloc_handle_oom();
return moz_xmalloc(size);
}
return ptr;
}
void*
moz_malloc(size_t size)
{
return malloc(size);
}
void*
moz_xcalloc(size_t nmemb, size_t size)
{
void* ptr = calloc(nmemb, size);
if (UNLIKELY(!ptr)) {
mozalloc_handle_oom();
return moz_xcalloc(nmemb, size);
}
return ptr;
}
void*
moz_calloc(size_t nmemb, size_t size)
{
return calloc(nmemb, size);
}
void*
moz_xrealloc(void* ptr, size_t size)
{
void* newptr = realloc(ptr, size);
if (UNLIKELY(!newptr)) {
mozalloc_handle_oom();
return moz_xrealloc(ptr, size);
}
return newptr;
}
void*
moz_realloc(void* ptr, size_t size)
{
return realloc(ptr, size);
}
char*
moz_xstrdup(const char* str)
{
char* dup = strdup(str);
if (UNLIKELY(!dup)) {
mozalloc_handle_oom();
return moz_xstrdup(str);
}
return dup;
}
char*
moz_strdup(const char* str)
{
return strdup(str);
}
#if defined(HAVE_STRNDUP)
char*
moz_xstrndup(const char* str, size_t strsize)
{
char* dup = strndup(str, strsize);
if (UNLIKELY(!dup)) {
mozalloc_handle_oom();
return moz_xstrndup(str, strsize);
}
return dup;
}
char*
moz_strndup(const char* str, size_t strsize)
{
return strndup(str, strsize);
}
#endif // if defined(HAVE_STRNDUP)
#if defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_JEMALLOC_POSIX_MEMALIGN)
int
moz_xposix_memalign(void **ptr, size_t alignment, size_t size)
{
int err = posix_memalign(ptr, alignment, size);
if (UNLIKELY(err && ENOMEM == err)) {
mozalloc_handle_oom();
return moz_xposix_memalign(ptr, alignment, size);
}
// else: (0 == err) or (EINVAL == err)
return err;
}
int
moz_posix_memalign(void **ptr, size_t alignment, size_t size)
{
int code = posix_memalign(ptr, alignment, size);
if (code)
return code;
#if defined(XP_MACOSX)
// Workaround faulty OSX posix_memalign, which provides memory with the
// incorrect alignment sometimes, but returns 0 as if nothing was wrong.
size_t mask = alignment - 1;
if (((size_t)(*ptr) & mask) != 0) {
void* old = *ptr;
code = moz_posix_memalign(ptr, alignment, size);
free(old);
}
#endif
return code;
}
#endif // if defined(HAVE_POSIX_MEMALIGN)
#if defined(HAVE_MEMALIGN) || defined(HAVE_JEMALLOC_MEMALIGN)
void*
moz_xmemalign(size_t boundary, size_t size)
{
void* ptr = memalign(boundary, size);
if (UNLIKELY(!ptr && EINVAL != errno)) {
mozalloc_handle_oom();
return moz_xmemalign(boundary, size);
}
// non-NULL ptr or errno == EINVAL
return ptr;
}
void*
moz_memalign(size_t boundary, size_t size)
{
return memalign(boundary, size);
}
#endif // if defined(HAVE_MEMALIGN)
#if defined(HAVE_VALLOC) || defined(HAVE_JEMALLOC_VALLOC)
void*
moz_xvalloc(size_t size)
{
void* ptr = valloc(size);
if (UNLIKELY(!ptr)) {
mozalloc_handle_oom();
return moz_xvalloc(size);
}
return ptr;
}
void*
moz_valloc(size_t size)
{
return valloc(size);
}
#endif // if defined(HAVE_VALLOC)
size_t
moz_malloc_usable_size(void *ptr)
{
if (!ptr)
return 0;
#if defined(XP_MACOSX)
return malloc_size(ptr);
#elif defined(MOZ_MEMORY)
return malloc_usable_size(ptr);
#elif defined(XP_WIN)
return _msize(ptr);
#else
return 0;
#endif
}
namespace mozilla {
const fallible_t fallible = fallible_t();
} // namespace mozilla
