| /* |
| * Copyright (C) 2010, 2014 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. AND ITS CONTRIBUTORS ``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 ITS 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/OSAllocator.h> |
| |
| #include <windows.h> |
| #include <wtf/Assertions.h> |
| #include <wtf/MathExtras.h> |
| #include <wtf/PageBlock.h> |
| #include <wtf/SoftLinking.h> |
| |
| SOFT_LINK_LIBRARY(kernelbase) |
| SOFT_LINK_OPTIONAL(kernelbase, VirtualAlloc2, void*, WINAPI, (HANDLE, PVOID, SIZE_T, ULONG, ULONG, MEM_EXTENDED_PARAMETER *, ULONG)) |
| |
| namespace WTF { |
| |
| static inline DWORD protection(bool writable, bool executable) |
| { |
| return executable ? |
| (writable ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ) : |
| (writable ? PAGE_READWRITE : PAGE_READONLY); |
| } |
| |
| void* OSAllocator::tryReserveUncommitted(size_t bytes, Usage, bool writable, bool executable, bool, bool) |
| { |
| return VirtualAlloc(nullptr, bytes, MEM_RESERVE, protection(writable, executable)); |
| } |
| |
| void* OSAllocator::reserveUncommitted(size_t bytes, Usage usage, bool writable, bool executable, bool jitCageEnabled, bool includesGuardPages) |
| { |
| void* result = tryReserveUncommitted(bytes, usage, writable, executable, jitCageEnabled, includesGuardPages); |
| RELEASE_ASSERT(result); |
| return result; |
| } |
| |
| void* OSAllocator::tryReserveUncommittedAligned(size_t bytes, size_t alignment, Usage usage, bool writable, bool executable, bool, bool) |
| { |
| ASSERT(hasOneBitSet(alignment) && alignment >= pageSize()); |
| |
| if (VirtualAlloc2Ptr()) { |
| MEM_ADDRESS_REQUIREMENTS addressReqs = { }; |
| MEM_EXTENDED_PARAMETER param = { }; |
| addressReqs.Alignment = alignment; |
| param.Type = MemExtendedParameterAddressRequirements; |
| param.Pointer = &addressReqs; |
| void* result = VirtualAlloc2Ptr()(nullptr, nullptr, bytes, MEM_RESERVE, protection(writable, executable), ¶m, 1); |
| return result; |
| } |
| |
| void* result = tryReserveUncommitted(bytes + alignment); |
| // There's no way to release the reserved memory on Windows, from what I can tell as the whole segment has to be released at once. |
| char* aligned = reinterpret_cast<char*>(roundUpToMultipleOf(alignment, reinterpret_cast<uintptr_t>(result))); |
| return aligned; |
| } |
| |
| void* OSAllocator::tryReserveAndCommit(size_t bytes, Usage, bool writable, bool executable, bool, bool) |
| { |
| return VirtualAlloc(nullptr, bytes, MEM_RESERVE | MEM_COMMIT, protection(writable, executable)); |
| } |
| |
| void* OSAllocator::reserveAndCommit(size_t bytes, Usage usage, bool writable, bool executable, bool jitCageEnabled, bool includesGuardPages) |
| { |
| void* result = tryReserveAndCommit(bytes, usage, writable, executable, jitCageEnabled, includesGuardPages); |
| RELEASE_ASSERT(result); |
| return result; |
| } |
| |
| void OSAllocator::commit(void* address, size_t bytes, bool writable, bool executable) |
| { |
| void* result = VirtualAlloc(address, bytes, MEM_COMMIT, protection(writable, executable)); |
| if (!result) |
| CRASH(); |
| } |
| |
| void OSAllocator::decommit(void* address, size_t bytes) |
| { |
| // According to http://msdn.microsoft.com/en-us/library/aa366892(VS.85).aspx, |
| // bytes (i.e. dwSize) being 0 when dwFreeType is MEM_DECOMMIT means that we'll |
| // decommit the entire region allocated by VirtualAlloc() instead of decommitting |
| // nothing as we would expect. Hence, we should check if bytes is 0 and handle it |
| // appropriately before calling VirtualFree(). |
| // See: https://bugs.webkit.org/show_bug.cgi?id=121972. |
| if (!bytes) |
| return; |
| // Silence warning about using MEM_DECOMMIT instead of MEM_RELEASE: |
| #pragma warning(suppress: 6250) |
| bool result = VirtualFree(address, bytes, MEM_DECOMMIT); |
| if (!result) |
| CRASH(); |
| } |
| |
| void OSAllocator::releaseDecommitted(void* address, size_t bytes) |
| { |
| // See comment in OSAllocator::decommit(). Similarly, when bytes is 0, we |
| // don't want to release anything. So, don't call VirtualFree() below. |
| if (!bytes) |
| return; |
| // According to http://msdn.microsoft.com/en-us/library/aa366892(VS.85).aspx, |
| // dwSize must be 0 if dwFreeType is MEM_RELEASE. |
| bool result = VirtualFree(address, 0, MEM_RELEASE); |
| if (!result) |
| CRASH(); |
| } |
| |
| void OSAllocator::hintMemoryNotNeededSoon(void*, size_t) |
| { |
| } |
| |
| } // namespace WTF |