gecko/memory/mozalloc/mozalloc.h

328 lines
9.7 KiB
C++

/* -*- 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 ***** */
#ifndef mozilla_mozalloc_h
#define mozilla_mozalloc_h
/*
* https://bugzilla.mozilla.org/show_bug.cgi?id=427099
*/
#include <stdlib.h>
#include <string.h>
#if defined(__cplusplus)
# include <new>
#endif
#define MOZALLOC_HAVE_XMALLOC
#if defined(MOZALLOC_EXPORT)
/* do nothing: it's been defined to __declspec(dllexport) by
* mozalloc*.cpp on platforms where that's required. */
#elif defined(XP_WIN) || (defined(XP_OS2) && defined(__declspec))
# define MOZALLOC_EXPORT __declspec(dllimport)
#elif defined(HAVE_VISIBILITY_ATTRIBUTE)
/* Make sure symbols are still exported even if we're wrapped in a
* |visibility push(hidden)| blanket. */
# define MOZALLOC_EXPORT __attribute__ ((visibility ("default")))
#else
# define MOZALLOC_EXPORT
#endif
#if defined(NS_ALWAYS_INLINE)
# define MOZALLOC_INLINE NS_ALWAYS_INLINE inline
#elif defined(HAVE_FORCEINLINE)
# define MOZALLOC_INLINE __forceinline
#else
# define MOZALLOC_INLINE inline
#endif
/* Workaround build problem with Sun Studio 12 */
#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
# undef NS_WARN_UNUSED_RESULT
# define NS_WARN_UNUSED_RESULT
# undef NS_ATTR_MALLOC
# define NS_ATTR_MALLOC
#endif
#if defined(__cplusplus)
extern "C" {
#endif /* ifdef __cplusplus */
/*
* Each pair of declarations below is analogous to a "standard"
* allocation function, except that the out-of-memory handling is made
* explicit. The |moz_x| versions will never return a NULL pointer;
* if memory is exhausted, they abort. The |moz_| versions may return
* NULL pointers if memory is exhausted: their return value must be
* checked.
*
* All these allocation functions are *guaranteed* to return a pointer
* to memory allocated in such a way that that memory can be freed by
* passing that pointer to |moz_free()|.
*/
MOZALLOC_EXPORT
void moz_free(void* ptr);
MOZALLOC_EXPORT void* moz_xmalloc(size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT
void* moz_malloc(size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT void* moz_xcalloc(size_t nmemb, size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT void* moz_calloc(size_t nmemb, size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT void* moz_xrealloc(void* ptr, size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT void* moz_realloc(void* ptr, size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT char* moz_xstrdup(const char* str)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT char* moz_strdup(const char* str)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT size_t moz_malloc_usable_size(void *ptr);
#if defined(HAVE_STRNDUP)
MOZALLOC_EXPORT char* moz_xstrndup(const char* str, size_t strsize)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT char* moz_strndup(const char* str, size_t strsize)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
#endif /* if defined(HAVE_STRNDUP) */
#if defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_JEMALLOC_POSIX_MEMALIGN)
MOZALLOC_EXPORT int moz_xposix_memalign(void **ptr, size_t alignment, size_t size)
NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT int moz_posix_memalign(void **ptr, size_t alignment, size_t size)
NS_WARN_UNUSED_RESULT;
#endif /* if defined(HAVE_POSIX_MEMALIGN) */
#if defined(HAVE_MEMALIGN) || defined(HAVE_JEMALLOC_MEMALIGN)
MOZALLOC_EXPORT void* moz_xmemalign(size_t boundary, size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT void* moz_memalign(size_t boundary, size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
#endif /* if defined(HAVE_MEMALIGN) */
#if defined(HAVE_VALLOC)
MOZALLOC_EXPORT void* moz_xvalloc(size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
MOZALLOC_EXPORT void* moz_valloc(size_t size)
NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
#endif /* if defined(HAVE_VALLOC) */
#ifdef __cplusplus
} /* extern "C" */
#endif /* ifdef __cplusplus */
#ifdef __cplusplus
/*
* We implement the default operators new/delete as part of
* libmozalloc, replacing their definitions in libstdc++. The
* operator new* definitions in libmozalloc will never return a NULL
* pointer.
*
* Each operator new immediately below returns a pointer to memory
* that can be delete'd by any of
*
* (1) the matching infallible operator delete immediately below
* (2) the matching "fallible" operator delete further below
* (3) the matching system |operator delete(void*, std::nothrow)|
* (4) the matching system |operator delete(void*) throw(std::bad_alloc)|
*
* NB: these are declared |throw(std::bad_alloc)|, though they will never
* throw that exception. This declaration is consistent with the rule
* that |::operator new() throw(std::bad_alloc)| will never return NULL.
*/
/* NB: This is defined just to silence vacuous warnings about symbol
* visibility on OS X/gcc. These symbols are force-inline and not
* exported. */
#if defined(XP_MACOSX)
# define MOZALLOC_EXPORT_NEW MOZALLOC_EXPORT
#else
# define MOZALLOC_EXPORT_NEW
#endif
#if defined(ANDROID) || defined(_MSC_VER)
/*
* Android doesn't fully support exceptions, so its <new> header
* has operators that don't specify throw() at all. Also include MSVC
* to suppress build warning spam (bug 578546).
*/
#define MOZALLOC_THROW_IF_HAS_EXCEPTIONS /**/
#else
#define MOZALLOC_THROW_IF_HAS_EXCEPTIONS throw()
#endif
#ifdef MOZ_CPP_EXCEPTIONS
#define MOZALLOC_THROW_BAD_ALLOC throw(std::bad_alloc)
#else
#define MOZALLOC_THROW_BAD_ALLOC MOZALLOC_THROW_IF_HAS_EXCEPTIONS
#endif
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void* operator new(size_t size) MOZALLOC_THROW_BAD_ALLOC
{
return moz_xmalloc(size);
}
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void* operator new(size_t size, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_malloc(size);
}
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void* operator new[](size_t size) MOZALLOC_THROW_BAD_ALLOC
{
return moz_xmalloc(size);
}
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void* operator new[](size_t size, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_malloc(size);
}
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void operator delete(void* ptr) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_free(ptr);
}
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void operator delete(void* ptr, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_free(ptr);
}
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void operator delete[](void* ptr) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_free(ptr);
}
MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
void operator delete[](void* ptr, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_free(ptr);
}
/*
* We also add a new allocator variant: "fallible operator new."
* Unlike libmozalloc's implementations of the standard nofail
* allocators, this allocator is allowed to return NULL. It can be used
* as follows
*
* Foo* f = new (mozilla::fallible) Foo(...);
*
* operator delete(fallible) is defined for completeness only.
*
* Each operator new below returns a pointer to memory that can be
* delete'd by any of
*
* (1) the matching "fallible" operator delete below
* (2) the matching infallible operator delete above
* (3) the matching system |operator delete(void*, std::nothrow)|
* (4) the matching system |operator delete(void*) throw(std::bad_alloc)|
*/
namespace mozilla {
struct MOZALLOC_EXPORT fallible_t { };
} /* namespace mozilla */
MOZALLOC_INLINE
void* operator new(size_t size, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_malloc(size);
}
MOZALLOC_INLINE
void* operator new[](size_t size, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
return moz_malloc(size);
}
MOZALLOC_INLINE
void operator delete(void* ptr, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
moz_free(ptr);
}
MOZALLOC_INLINE
void operator delete[](void* ptr, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
{
moz_free(ptr);
}
#endif /* ifdef __cplusplus */
#endif /* ifndef mozilla_mozalloc_h */