/*
* Copyright (C) 2017-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/Gigacage.h>
#include <wtf/Atomics.h>
#include <wtf/PageBlock.h>
#if defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
#include <wtf/OSAllocator.h>
namespace Gigacage {
void* tryMalloc(Kind, size_t size)
{
return FastMalloc::tryMalloc(size);
}
void* tryRealloc(Kind, void* pointer, size_t size)
return FastMalloc::tryRealloc(pointer, size);
void* tryAllocateZeroedVirtualPages(Kind, size_t requestedSize)
size_t size = roundUpToMultipleOf(WTF::pageSize(), requestedSize);
RELEASE_ASSERT(size >= requestedSize);
void* result = OSAllocator::reserveUncommitted(size);
#if ASSERT_ENABLED
if (result) {
for (size_t i = 0; i < size / sizeof(uintptr_t); ++i)
ASSERT(static_cast<uintptr_t*>(result)[i] == 0);
#endif
return result;
void freeVirtualPages(Kind, void* basePtr, size_t size)
OSAllocator::decommitAndRelease(basePtr, size);
} // namespace Gigacage
#else // defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
#include <bmalloc/bmalloc.h>
// FIXME: Pointers into the primitive gigacage must be scrambled right after being returned from malloc,
// and stay scrambled except just before use.
// https://bugs.webkit.org/show_bug.cgi?id=175035
void* tryAlignedMalloc(Kind kind, size_t alignment, size_t size)
void* result = bmalloc::api::tryMemalign(alignment, size, bmalloc::heapKind(kind));
WTF::compilerFence();
void alignedFree(Kind kind, void* p)
if (!p)
return;
RELEASE_ASSERT(isCaged(kind, p));
bmalloc::api::free(p, bmalloc::heapKind(kind));
void* tryMalloc(Kind kind, size_t size)
void* result = bmalloc::api::tryMalloc(size, bmalloc::heapKind(kind));
void* tryRealloc(Kind kind, void* pointer, size_t size)
void* result = bmalloc::api::tryRealloc(pointer, size, bmalloc::heapKind(kind));
void free(Kind kind, void* p)
void* tryAllocateZeroedVirtualPages(Kind kind, size_t size)
void* result = bmalloc::api::tryLargeZeroedMemalignVirtual(WTF::pageSize(), size, bmalloc::heapKind(kind));
void freeVirtualPages(Kind kind, void* basePtr, size_t size)
if (!basePtr)
RELEASE_ASSERT(isCaged(kind, basePtr));
bmalloc::api::freeLargeVirtual(basePtr, size, bmalloc::heapKind(kind));
void* tryMallocArray(Kind kind, size_t numElements, size_t elementSize)
CheckedSize checkedSize = elementSize;
checkedSize *= numElements;
if (checkedSize.hasOverflowed())
return nullptr;
return tryMalloc(kind, checkedSize);
void* malloc(Kind kind, size_t size)
void* result = tryMalloc(kind, size);
RELEASE_ASSERT(result);
void* mallocArray(Kind kind, size_t numElements, size_t elementSize)
void* result = tryMallocArray(kind, numElements, elementSize);