Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant
++
++ #ifndef QV4EXECUTABLEALLOCATOR_H
++ #define QV4EXECUTABLEALLOCATOR_H
++
++ //
++ // W A R N I N G
++ // -------------
++ //
++ // This file is not part of the Qt API. It exists purely as an
++ // implementation detail. This header file may change from version to
++ // version without notice, or even be removed.
++ //
++ // We mean it.
++ //
++
++ #include <QMultiMap>
++ #include <QHash>
++ #include <QList>
++ #include <QByteArray>
++ #include <QMutex>
++
++ #include <QtQml/private/qtqmlglobal_p.h>
++
++ namespace WTF {
++ class PageAllocation;
++ }
++
++ QT_BEGIN_NAMESPACE
++
++ namespace QV4 {
++
++ class Q_QML_AUTOTEST_EXPORT ExecutableAllocator
++ {
++ public:
++ struct ChunkOfPages;
++ struct Allocation;
++
++ ExecutableAllocator();
++ ~ExecutableAllocator();
++
++ Allocation *allocate(size_t size);
++ void free(Allocation *allocation);
++
++ struct Allocation
++ {
++ Allocation()
++ : size(0)
++ , free(true)
++ {}
++
++ void *memoryStart() const;
++ size_t memorySize() const { return size; }
++
++ void *exceptionHandlerStart() const;
++ size_t exceptionHandlerSize() const;
++
++ void *codeStart() const;
++
++ void invalidate() { addr = 0; }
++ bool isValid() const { return addr != 0; }
++ void deallocate(ExecutableAllocator *allocator);
++
++ private:
++ ~Allocation() {}
++
++ friend class ExecutableAllocator;
++
++ Allocation *split(size_t dividingSize);
++ bool mergeNext(ExecutableAllocator *allocator);
++ bool mergePrevious(ExecutableAllocator *allocator);
++
++ quintptr addr = 0;
++ uint size : 31; // More than 2GB of function code? nah :)
++ uint free : 1;
++ Allocation *next = nullptr;
++ Allocation *prev = nullptr;
++ };
++
++ // for debugging / unit-testing
++ int freeAllocationCount() const { return freeAllocations.size(); }
++ int chunkCount() const { return chunks.size(); }
++
++ struct ChunkOfPages
++ {
++ ChunkOfPages()
++
++ {}
++ ~ChunkOfPages();
++
++ WTF::PageAllocation *pages = nullptr;
++ Allocation *firstAllocation = nullptr;
++
++ bool contains(Allocation *alloc) const;
++ };
++
++ ChunkOfPages *chunkForAllocation(Allocation *allocation) const;
++
++ private:
++ QMultiMap<size_t, Allocation*> freeAllocations;
++ QMap<quintptr, ChunkOfPages*> chunks;
++ mutable QMutex mutex;
++ };
++
++ }
++
++ QT_END_NAMESPACE
++
++ #endif // QV4EXECUTABLEALLOCATOR_H