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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef MASM_EXECUTABLEALLOCATOR_H
#define MASM_EXECUTABLEALLOCATOR_H
#include <RefPtr.h>
#include <RefCounted.h>
#include <wtf/PageBlock.h>
#include <private/qv4executableallocator_p.h>
#if OS(WINDOWS)
#include <windows.h>
#else
#include <sys/mman.h>
#include <unistd.h>
#endif
namespace JSC {
class JSGlobalData;
struct ExecutableMemoryHandle : public RefCounted<ExecutableMemoryHandle> {
ExecutableMemoryHandle(QV4::ExecutableAllocator *allocator, int size)
: m_allocator(allocator)
, m_size(size)
{
m_allocation = allocator->allocate(size);
}
~ExecutableMemoryHandle()
{
m_allocation->deallocate(m_allocator);
}
inline void shrink(size_t) {
// ### TODO.
}
inline bool isManaged() const { return true; }
void* start() { return m_allocation->start(); }
int sizeInBytes() { return m_size; }
QV4::ExecutableAllocator::ChunkOfPages *chunk() const
{ return m_allocator->chunkForAllocation(m_allocation); }
QV4::ExecutableAllocator *m_allocator;
QV4::ExecutableAllocator::Allocation *m_allocation;
int m_size;
};
struct ExecutableAllocator {
ExecutableAllocator(QV4::ExecutableAllocator *alloc)
: realAllocator(alloc)
{}
PassRefPtr<ExecutableMemoryHandle> allocate(JSGlobalData&, int size, void*, int)
{
return adoptRef(new ExecutableMemoryHandle(realAllocator, size));
}
static void makeWritable(void* addr, int size)
{
#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
size_t pageSize = WTF::pageSize();
size_t iaddr = reinterpret_cast<size_t>(addr);
size_t roundAddr = iaddr & ~(pageSize - static_cast<size_t>(1));
int mode = PROT_READ | PROT_WRITE;
mprotect(reinterpret_cast<void*>(roundAddr), size + (iaddr - roundAddr), mode);
#else
// We assume we already have RWX
(void)addr; // suppress unused parameter warning
(void)size; // suppress unused parameter warning
#endif
}
static void makeExecutable(void* addr, int size)
{
size_t pageSize = WTF::pageSize();
size_t iaddr = reinterpret_cast<size_t>(addr);
size_t roundAddr = iaddr & ~(pageSize - static_cast<size_t>(1));
#if OS(WINDOWS)
#if !OS(WINRT)
DWORD oldProtect;
VirtualProtect(reinterpret_cast<void*>(roundAddr), size + (iaddr - roundAddr), PAGE_EXECUTE_READWRITE, &oldProtect);
#endif
#else
int mode = PROT_READ | PROT_EXEC;
#if !ENABLE(ASSEMBLER_WX_EXCLUSIVE)
mode |= PROT_WRITE;
#endif
mprotect(reinterpret_cast<void*>(roundAddr), size + (iaddr - roundAddr), mode);
#endif
}
QV4::ExecutableAllocator *realAllocator;
};
}
#endif // MASM_EXECUTABLEALLOCATOR_H
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