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/*
* 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>
#if _MSC_VER >= 1900
// Try to use JIT by default and fallback to non-JIT on first error
static bool qt_winrt_use_jit = true;
#else // _MSC_VER < 1900
# define PAGE_EXECUTE 0x10
# define PAGE_EXECUTE_READ 0x20
# define PAGE_EXECUTE_READWRITE 0x40
# define MEM_RELEASE 0x8000
inline void* VirtualAllocFromApp(void*, size_t, int, int) { return 0; }
inline bool VirtualProtectFromApp(void *, size_t, int, DWORD*) { return false; }
inline bool VirtualFree(void *, size_t, DWORD) { return false; }
static bool qt_winrt_use_jit = false;
#endif // _MSC_VER < 1900
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;
if (qt_winrt_use_jit) {
result = VirtualAllocFromApp(0, bytes, MEM_RESERVE, protection(writable, executable));
if (!result) {
qt_winrt_use_jit = false;
return reserveUncommitted(bytes, UnknownUsage, writable, executable);
}
} else {
static const size_t pageSize = getPageSize();
result = _aligned_malloc(bytes, pageSize);
if (!result)
CRASH();
memset(result, 0, bytes);
}
return result;
}
void* OSAllocator::reserveAndCommit(size_t bytes, Usage usage, bool writable, bool executable, bool includesGuardPages)
{
void *result;
if (qt_winrt_use_jit) {
result = VirtualAllocFromApp(0, bytes, MEM_RESERVE | MEM_COMMIT,
protection(writable, executable));
if (!result) {
qt_winrt_use_jit = false;
return reserveAndCommit(bytes, usage, writable, executable, includesGuardPages);
}
if (includesGuardPages) {
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();
}
}
} else {
result = reserveUncommitted(bytes, usage, writable, executable);
}
return result;
}
void OSAllocator::commit(void*, size_t, bool, bool)
{
CRASH(); // Unimplemented
}
void OSAllocator::decommit(void* address, size_t)
{
if (qt_winrt_use_jit)
Q_UNREACHABLE();
else
_aligned_free(address);
}
void OSAllocator::releaseDecommitted(void* address, size_t bytes)
{
if (qt_winrt_use_jit) {
bool result = VirtualFree(address, 0, MEM_RELEASE);
if (!result)
CRASH();
} else {
decommit(address, bytes);
}
}
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)
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