mirror of
https://github.com/mozilla/gecko-dev.git
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bcc953b354
If new doesn't throw bad_alloc the compiler emits a null check after to avoid calling the constructor. http://llvm.org/bugs/show_bug.cgi?id=10895 Adding throw(std::bad_alloc) shaves 57KB of .text off a gcc mac build and 61KB off a clang build. --HG-- extra : rebase_source : 098c1f5df472bcc572b812fe5d4f12c8eadf14d2
327 lines
9.8 KiB
C++
327 lines
9.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sw=4 ts=4 et :
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Jones <jones.chris.g@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_mozalloc_h
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#define mozilla_mozalloc_h
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/*
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* https://bugzilla.mozilla.org/show_bug.cgi?id=427099
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*/
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#include <stdlib.h>
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#include <string.h>
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#if defined(__cplusplus)
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# include <new>
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#endif
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#include "xpcom-config.h"
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#define MOZALLOC_HAVE_XMALLOC
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#define MOZALLOC_HAVE_MALLOC_USABLE_SIZE
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#if defined(MOZALLOC_EXPORT)
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/* do nothing: it's been defined to __declspec(dllexport) by
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* mozalloc*.cpp on platforms where that's required. */
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#elif defined(XP_WIN) || (defined(XP_OS2) && defined(__declspec))
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# define MOZALLOC_EXPORT __declspec(dllimport)
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#elif defined(HAVE_VISIBILITY_ATTRIBUTE)
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/* Make sure symbols are still exported even if we're wrapped in a
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* |visibility push(hidden)| blanket. */
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# define MOZALLOC_EXPORT __attribute__ ((visibility ("default")))
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#else
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# define MOZALLOC_EXPORT
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#endif
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#if defined(NS_ALWAYS_INLINE)
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# define MOZALLOC_INLINE NS_ALWAYS_INLINE inline
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#elif defined(HAVE_FORCEINLINE)
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# define MOZALLOC_INLINE __forceinline
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#else
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# define MOZALLOC_INLINE inline
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#endif
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/* Workaround build problem with Sun Studio 12 */
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#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
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# undef NS_WARN_UNUSED_RESULT
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# define NS_WARN_UNUSED_RESULT
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# undef NS_ATTR_MALLOC
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# define NS_ATTR_MALLOC
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#endif
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#if defined(__cplusplus)
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extern "C" {
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#endif /* ifdef __cplusplus */
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/*
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* Each pair of declarations below is analogous to a "standard"
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* allocation function, except that the out-of-memory handling is made
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* explicit. The |moz_x| versions will never return a NULL pointer;
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* if memory is exhausted, they abort. The |moz_| versions may return
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* NULL pointers if memory is exhausted: their return value must be
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* checked.
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*
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* All these allocation functions are *guaranteed* to return a pointer
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* to memory allocated in such a way that that memory can be freed by
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* passing that pointer to |moz_free()|.
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*/
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MOZALLOC_EXPORT
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void moz_free(void* ptr);
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MOZALLOC_EXPORT void* moz_xmalloc(size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT
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void* moz_malloc(size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT void* moz_xcalloc(size_t nmemb, size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT void* moz_calloc(size_t nmemb, size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT void* moz_xrealloc(void* ptr, size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT void* moz_realloc(void* ptr, size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT char* moz_xstrdup(const char* str)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT char* moz_strdup(const char* str)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT size_t moz_malloc_usable_size(void *ptr);
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#if defined(HAVE_STRNDUP)
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MOZALLOC_EXPORT char* moz_xstrndup(const char* str, size_t strsize)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT char* moz_strndup(const char* str, size_t strsize)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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#endif /* if defined(HAVE_STRNDUP) */
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#if defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_JEMALLOC_POSIX_MEMALIGN)
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MOZALLOC_EXPORT int moz_xposix_memalign(void **ptr, size_t alignment, size_t size)
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NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT int moz_posix_memalign(void **ptr, size_t alignment, size_t size)
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NS_WARN_UNUSED_RESULT;
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#endif /* if defined(HAVE_POSIX_MEMALIGN) */
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#if defined(HAVE_MEMALIGN) || defined(HAVE_JEMALLOC_MEMALIGN)
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MOZALLOC_EXPORT void* moz_xmemalign(size_t boundary, size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT void* moz_memalign(size_t boundary, size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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#endif /* if defined(HAVE_MEMALIGN) */
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#if defined(HAVE_VALLOC) || defined(HAVE_JEMALLOC_VALLOC)
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MOZALLOC_EXPORT void* moz_xvalloc(size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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MOZALLOC_EXPORT void* moz_valloc(size_t size)
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NS_ATTR_MALLOC NS_WARN_UNUSED_RESULT;
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#endif /* if defined(HAVE_VALLOC) */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif /* ifdef __cplusplus */
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#ifdef __cplusplus
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/*
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* We implement the default operators new/delete as part of
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* libmozalloc, replacing their definitions in libstdc++. The
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* operator new* definitions in libmozalloc will never return a NULL
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* pointer.
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*
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* Each operator new immediately below returns a pointer to memory
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* that can be delete'd by any of
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*
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* (1) the matching infallible operator delete immediately below
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* (2) the matching "fallible" operator delete further below
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* (3) the matching system |operator delete(void*, std::nothrow)|
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* (4) the matching system |operator delete(void*) throw(std::bad_alloc)|
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*
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* NB: these are declared |throw(std::bad_alloc)|, though they will never
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* throw that exception. This declaration is consistent with the rule
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* that |::operator new() throw(std::bad_alloc)| will never return NULL.
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*/
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/* NB: This is defined just to silence vacuous warnings about symbol
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* visibility on OS X/gcc. These symbols are force-inline and not
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* exported. */
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#if defined(XP_MACOSX)
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# define MOZALLOC_EXPORT_NEW MOZALLOC_EXPORT
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#else
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# define MOZALLOC_EXPORT_NEW
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#endif
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#if defined(ANDROID) || defined(_MSC_VER)
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/*
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* Android doesn't fully support exceptions, so its <new> header
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* has operators that don't specify throw() at all. Also include MSVC
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* to suppress build warning spam (bug 578546).
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*/
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#define MOZALLOC_THROW_IF_HAS_EXCEPTIONS /**/
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#define MOZALLOC_THROW_BAD_ALLOC_IF_HAS_EXCEPTIONS
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#else
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#define MOZALLOC_THROW_IF_HAS_EXCEPTIONS throw()
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#define MOZALLOC_THROW_BAD_ALLOC_IF_HAS_EXCEPTIONS throw(std::bad_alloc)
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#endif
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#define MOZALLOC_THROW_BAD_ALLOC MOZALLOC_THROW_BAD_ALLOC_IF_HAS_EXCEPTIONS
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void* operator new(size_t size) MOZALLOC_THROW_BAD_ALLOC
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{
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return moz_xmalloc(size);
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}
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void* operator new(size_t size, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_malloc(size);
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}
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void* operator new[](size_t size) MOZALLOC_THROW_BAD_ALLOC
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{
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return moz_xmalloc(size);
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}
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void* operator new[](size_t size, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_malloc(size);
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}
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void operator delete(void* ptr) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_free(ptr);
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}
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void operator delete(void* ptr, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_free(ptr);
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}
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void operator delete[](void* ptr) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_free(ptr);
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}
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MOZALLOC_EXPORT_NEW MOZALLOC_INLINE
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void operator delete[](void* ptr, const std::nothrow_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_free(ptr);
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}
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/*
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* We also add a new allocator variant: "fallible operator new."
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* Unlike libmozalloc's implementations of the standard nofail
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* allocators, this allocator is allowed to return NULL. It can be used
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* as follows
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*
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* Foo* f = new (mozilla::fallible) Foo(...);
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*
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* operator delete(fallible) is defined for completeness only.
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*
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* Each operator new below returns a pointer to memory that can be
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* delete'd by any of
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*
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* (1) the matching "fallible" operator delete below
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* (2) the matching infallible operator delete above
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* (3) the matching system |operator delete(void*, std::nothrow)|
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* (4) the matching system |operator delete(void*) throw(std::bad_alloc)|
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*/
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namespace mozilla {
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struct MOZALLOC_EXPORT fallible_t { };
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} /* namespace mozilla */
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MOZALLOC_INLINE
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void* operator new(size_t size, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_malloc(size);
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}
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MOZALLOC_INLINE
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void* operator new[](size_t size, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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return moz_malloc(size);
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}
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MOZALLOC_INLINE
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void operator delete(void* ptr, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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moz_free(ptr);
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}
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MOZALLOC_INLINE
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void operator delete[](void* ptr, const mozilla::fallible_t&) MOZALLOC_THROW_IF_HAS_EXCEPTIONS
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{
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moz_free(ptr);
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}
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#endif /* ifdef __cplusplus */
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#endif /* ifndef mozilla_mozalloc_h */
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