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| #ifndef QV4PROPERTYKEY_H |
| #define QV4PROPERTYKEY_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 <private/qv4global_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| class QString; |
| |
| namespace QV4 { |
| |
| struct PropertyKey |
| { |
| private: |
| // Property keys are Strings, Symbols or unsigned integers. |
| // For convenience we derive them from Values, allowing us to store them |
| // on the JS stack |
| // |
| // They do however behave somewhat different than a Value: |
| // * If the key is a String, the pointer to the string is stored in the identifier |
| // table and thus unique. |
| // * If the key is a Symbol it simply points to the referenced symbol object |
| // * if the key is an array index (a uint < UINT_MAX), it's encoded as an |
| // integer value |
| quint64 val; |
| |
| // Important: Always keep this in sync with the definitions for Integers and heap objects in Value |
| static const quint64 ArrayIndexMask = 0x3800000000000ull; |
| enum { |
| IsManagedOrUndefined_Shift = 64-15, |
| }; |
| inline bool isManaged() const { return (val >> IsManagedOrUndefined_Shift) == 0; } |
| inline quint32 value() const { return val & quint64(~quint32(0)); } |
| |
| #if QT_POINTER_SIZE == 8 |
| QML_NEARLY_ALWAYS_INLINE Heap::StringOrSymbol *m() const |
| { |
| Heap::StringOrSymbol *b; |
| memcpy(&b, &val, 8); |
| return b; |
| } |
| QML_NEARLY_ALWAYS_INLINE void setM(Heap::StringOrSymbol *b) |
| { |
| memcpy(&val, &b, 8); |
| } |
| #elif QT_POINTER_SIZE == 4 |
| QML_NEARLY_ALWAYS_INLINE Heap::StringOrSymbol *m() const |
| { |
| Q_STATIC_ASSERT(sizeof(Heap::StringOrSymbol*) == sizeof(quint32)); |
| Heap::StringOrSymbol *b; |
| quint32 v = value(); |
| memcpy(&b, &v, 4); |
| return b; |
| } |
| QML_NEARLY_ALWAYS_INLINE void setM(Heap::StringOrSymbol *b) |
| { |
| quint32 v; |
| memcpy(&v, &b, 4); |
| val = v; |
| } |
| #endif |
| |
| public: |
| static PropertyKey invalid() { PropertyKey key; key.val = 0; return key; } |
| static PropertyKey fromArrayIndex(uint idx) { PropertyKey key; key.val = ArrayIndexMask | static_cast<quint64>(idx); return key; } |
| bool isStringOrSymbol() const { return isManaged() && val != 0; } |
| uint asArrayIndex() const { Q_ASSERT(isArrayIndex()); return static_cast<uint>(val & 0xffffffff); } |
| uint isArrayIndex() const { return !isManaged() && val != 0; } |
| bool isValid() const { return val != 0; } |
| static PropertyKey fromStringOrSymbol(Heap::StringOrSymbol *b) |
| { PropertyKey key; key.setM(b); return key; } |
| Heap::StringOrSymbol *asStringOrSymbol() const { |
| if (!isManaged()) |
| return nullptr; |
| return m(); |
| } |
| |
| Q_QML_EXPORT bool isString() const; |
| bool isSymbol() const; |
| bool isCanonicalNumericIndexString() const; |
| |
| Q_QML_EXPORT QString toQString() const; |
| Heap::StringOrSymbol *toStringOrSymbol(ExecutionEngine *e); |
| quint64 id() const { return val; } |
| static PropertyKey fromId(quint64 id) { |
| PropertyKey key; key.val = id; return key; |
| } |
| |
| enum FunctionNamePrefix { |
| None, |
| Getter, |
| Setter |
| }; |
| Heap::String *asFunctionName(ExecutionEngine *e, FunctionNamePrefix prefix) const; |
| |
| bool operator ==(const PropertyKey &other) const { return val == other.val; } |
| bool operator !=(const PropertyKey &other) const { return val != other.val; } |
| bool operator <(const PropertyKey &other) const { return val < other.val; } |
| }; |
| |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |