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| |
| #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 "qv4global_p.h" |
| |
| #include <QMultiMap> |
| #include <QHash> |
| #include <QVector> |
| #include <QByteArray> |
| #include <QMutex> |
| |
| 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 *exceptionHandler() const; |
| void *start() 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.count(); } |
| int chunkCount() const { return chunks.count(); } |
| |
| 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 QRecursiveMutex mutex; |
| }; |
| |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif // QV4EXECUTABLEALLOCATOR_H |