diff options
author | Jędrzej Nowacki <jedrzej.nowacki@digia.com> | 2013-01-29 14:20:50 +0100 |
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committer | Lars Knoll <lars.knoll@digia.com> | 2013-01-30 13:20:40 +0100 |
commit | 74fba4d8069c946c1ba12b9ac4d4026aaf14118b (patch) | |
tree | 138cc204ec33ef0c838c98355ea84846e11ca1a7 /src/3rdparty/masm/stubs/ExecutableAllocator.h | |
parent | 0781ecb087b027cccc1c44de1a1c7520cc89e2d2 (diff) |
Say hello to QtV4 module.
Change-Id: I507cd5707b7d7223a0d901cf939896fb2649b684
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Diffstat (limited to 'src/3rdparty/masm/stubs/ExecutableAllocator.h')
-rw-r--r-- | src/3rdparty/masm/stubs/ExecutableAllocator.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/3rdparty/masm/stubs/ExecutableAllocator.h b/src/3rdparty/masm/stubs/ExecutableAllocator.h new file mode 100644 index 0000000000..7b3004aa90 --- /dev/null +++ b/src/3rdparty/masm/stubs/ExecutableAllocator.h @@ -0,0 +1,105 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the V4VM module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/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 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ +#ifndef MASM_EXECUTABLEALLOCATOR_H +#define MASM_EXECUTABLEALLOCATOR_H + +#include <RefPtr.h> +#include <RefCounted.h> + +#include <sys/mman.h> +#include <unistd.h> + +namespace JSC { + +class JSGlobalData; + +struct ExecutableMemoryHandle : public RefCounted<ExecutableMemoryHandle> { + ExecutableMemoryHandle(int size) + : m_size(size) + { + static size_t pageSize = sysconf(_SC_PAGESIZE); + m_size = (m_size + pageSize - 1) & ~(pageSize - 1); +#if OS(DARWIN) +# define MAP_ANONYMOUS MAP_ANON +#endif + m_data = mmap(0, m_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + } + ~ExecutableMemoryHandle() + { + munmap(m_data, m_size); + } + + inline void shrink(size_t) { + // ### TODO. + } + + inline bool isManaged() const { return true; } + + void* start() { return m_data; } + int sizeInBytes() { return m_size; } + + void* m_data; + int m_size; +}; + +struct ExecutableAllocator { + PassRefPtr<ExecutableMemoryHandle> allocate(JSGlobalData&, int size, void*, int) + { + return adoptRef(new ExecutableMemoryHandle(size)); + } + + static void makeWritable(void*, int) + { + } + + static void makeExecutable(void* addr, int size) + { + static size_t pageSize = sysconf(_SC_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 | PROT_EXEC; + mprotect(reinterpret_cast<void*>(roundAddr), size + (iaddr - roundAddr), mode); + } +}; + +} + +#endif // MASM_EXECUTABLEALLOCATOR_H |