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| ** This file is part of the QtQml module of the Qt Toolkit. |
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| ** Alternatively, this file may be used under the terms of the GNU |
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| ****************************************************************************/ |
| #ifndef QV4PERSISTENT_H |
| #define QV4PERSISTENT_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 "qv4value_p.h" |
| #include "qv4managed_p.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QV4 { |
| |
| struct Q_QML_EXPORT PersistentValueStorage |
| { |
| PersistentValueStorage(ExecutionEngine *engine); |
| ~PersistentValueStorage(); |
| |
| Value *allocate(); |
| static void free(Value *e); |
| |
| void mark(MarkStack *markStack); |
| |
| struct Iterator { |
| Iterator(void *p, int idx); |
| Iterator(const Iterator &o); |
| Iterator & operator=(const Iterator &o); |
| ~Iterator(); |
| void *p; |
| int index; |
| Iterator &operator++(); |
| bool operator !=(const Iterator &other) { |
| return p != other.p || index != other.index; |
| } |
| Value &operator *(); |
| }; |
| Iterator begin() { return Iterator(firstPage, 0); } |
| Iterator end() { return Iterator(nullptr, 0); } |
| |
| static ExecutionEngine *getEngine(Value *v); |
| |
| ExecutionEngine *engine; |
| void *firstPage; |
| private: |
| static void freePage(void *page); |
| }; |
| |
| class Q_QML_EXPORT PersistentValue |
| { |
| public: |
| PersistentValue() {} |
| PersistentValue(const PersistentValue &other); |
| PersistentValue &operator=(const PersistentValue &other); |
| PersistentValue &operator=(const WeakValue &other); |
| PersistentValue &operator=(Object *object); |
| ~PersistentValue(); |
| |
| PersistentValue(ExecutionEngine *engine, const Value &value); |
| PersistentValue(ExecutionEngine *engine, ReturnedValue value); |
| PersistentValue(ExecutionEngine *engine, Object *object); |
| |
| void set(ExecutionEngine *engine, const Value &value); |
| void set(ExecutionEngine *engine, ReturnedValue value); |
| void set(ExecutionEngine *engine, Heap::Base *obj); |
| |
| ReturnedValue value() const { |
| return (val ? val->asReturnedValue() : Encode::undefined()); |
| } |
| Value *valueRef() const { |
| return val; |
| } |
| Managed *asManaged() const { |
| if (!val) |
| return nullptr; |
| return val->managed(); |
| } |
| template<typename T> |
| T *as() const { |
| if (!val) |
| return nullptr; |
| return val->as<T>(); |
| } |
| |
| ExecutionEngine *engine() const { |
| if (!val) |
| return nullptr; |
| return PersistentValueStorage::getEngine(val); |
| } |
| |
| bool isUndefined() const { return !val || val->isUndefined(); } |
| bool isNullOrUndefined() const { return !val || val->isNullOrUndefined(); } |
| void clear() { |
| PersistentValueStorage::free(val); |
| val = nullptr; |
| } |
| bool isEmpty() { return !val; } |
| |
| private: |
| Value *val = nullptr; |
| }; |
| |
| class Q_QML_EXPORT WeakValue |
| { |
| public: |
| WeakValue() {} |
| WeakValue(const WeakValue &other); |
| WeakValue(ExecutionEngine *engine, const Value &value); |
| WeakValue &operator=(const WeakValue &other); |
| ~WeakValue(); |
| |
| void set(ExecutionEngine *engine, const Value &value) |
| { |
| if (!val) |
| allocVal(engine); |
| *val = value; |
| } |
| |
| void set(ExecutionEngine *engine, ReturnedValue value) |
| { |
| if (!val) |
| allocVal(engine); |
| *val = value; |
| } |
| |
| void set(ExecutionEngine *engine, Heap::Base *obj) |
| { |
| if (!val) |
| allocVal(engine); |
| *val = obj; |
| } |
| |
| ReturnedValue value() const { |
| return (val ? val->asReturnedValue() : Encode::undefined()); |
| } |
| Value *valueRef() const { |
| return val; |
| } |
| Managed *asManaged() const { |
| if (!val) |
| return nullptr; |
| return val->managed(); |
| } |
| template <typename T> |
| T *as() const { |
| if (!val) |
| return nullptr; |
| return val->as<T>(); |
| } |
| |
| ExecutionEngine *engine() const { |
| if (!val) |
| return nullptr; |
| return PersistentValueStorage::getEngine(val); |
| } |
| |
| bool isUndefined() const { return !val || val->isUndefined(); } |
| bool isNullOrUndefined() const { return !val || val->isNullOrUndefined(); } |
| void clear() { free(); } |
| |
| void markOnce(MarkStack *markStack); |
| |
| private: |
| Value *val = nullptr; |
| |
| private: |
| Q_NEVER_INLINE void allocVal(ExecutionEngine *engine); |
| |
| void free(); |
| }; |
| |
| } // namespace QV4 |
| |
| QT_END_NAMESPACE |
| |
| #endif |