| /* |
| * Copyright (C) 2010 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 "OSAllocator.h" |
| #include "PageBlock.h" |
| |
| #if OS(WINRT) |
| |
| #include "windows.h" |
| #include <wtf/Assertions.h> |
| |
| // Try to use JIT by default and fallback to non-JIT on first error |
| static bool qt_winrt_use_jit = true; |
| |
| namespace WTF { |
| |
| inline size_t getPageSize() |
| { |
| SYSTEM_INFO info; |
| GetNativeSystemInfo(&info); |
| return info.dwPageSize; |
| } |
| |
| static inline DWORD protection(bool writable, bool executable) |
| { |
| if (writable && executable) |
| qFatal("read/write executable areas are not allowed on WinRT"); |
| return executable ? |
| (writable ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ) : |
| (writable ? PAGE_READWRITE : PAGE_READONLY); |
| } |
| |
| void* OSAllocator::reserveUncommitted(size_t bytes, Usage, bool writable, bool executable) |
| { |
| void *result = VirtualAllocFromApp(0, bytes, MEM_RESERVE, protection(writable, executable)); |
| return result; |
| } |
| |
| void* OSAllocator::reserveAndCommit(size_t bytes, Usage, bool writable, bool executable, bool includesGuardPages) |
| { |
| void *result; |
| result = VirtualAllocFromApp(0, bytes, MEM_RESERVE | MEM_COMMIT, |
| protection(writable, executable)); |
| |
| if (includesGuardPages && qt_winrt_use_jit) { |
| size_t guardSize = pageSize(); |
| DWORD oldProtect; |
| if (!VirtualProtectFromApp(result, guardSize, protection(false, false), &oldProtect) || |
| !VirtualProtectFromApp(static_cast<char*>(result) + bytes - guardSize, guardSize, |
| protection(false, false), &oldProtect)) { |
| CRASH(); |
| } |
| } |
| return result; |
| } |
| |
| void OSAllocator::commit(void *bytes, size_t size, bool writable, bool executable) |
| { |
| void *result = VirtualAllocFromApp(bytes, size, MEM_COMMIT, |
| protection(writable, executable)); |
| if (!result) |
| CRASH(); |
| } |
| |
| void OSAllocator::decommit(void* address, size_t bytes) |
| { |
| bool result = VirtualFree(address, bytes, MEM_DECOMMIT); |
| if (!result) |
| CRASH(); |
| } |
| |
| void OSAllocator::releaseDecommitted(void* address, size_t) |
| { |
| bool result = VirtualFree(address, 0, MEM_RELEASE); |
| if (!result) |
| CRASH(); |
| } |
| |
| bool OSAllocator::canAllocateExecutableMemory() |
| { |
| if (qt_winrt_use_jit) { |
| // For WinRT we first check if code generation is enabled. If successful |
| // we allow to use JIT, otherwise fallback to the interpreter |
| const size_t pageSize = getPageSize(); |
| void *all = VirtualAllocFromApp(0, pageSize, MEM_RESERVE | MEM_COMMIT, |
| protection(true, false)); |
| DWORD oldProtect; |
| bool res = VirtualProtectFromApp(all, pageSize, PAGE_EXECUTE, &oldProtect); |
| VirtualFree(all, 0, MEM_RELEASE); |
| if (!res) { |
| qt_winrt_use_jit = false; |
| qWarning("Could not enable JIT, fallback to interpreter mode. " |
| "Consider setting the code-generation capability"); |
| } |
| } |
| return qt_winrt_use_jit; |
| } |
| |
| |
| } // namespace WTF |
| |
| #endif // OS(WINRT) |