qt-everywhere-src-5.15.1/qtdeclarative/src/qml/jsruntime/qv4argumentsobject_p.h

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#ifndef QV4ARGUMENTSOBJECTS_H
#define QV4ARGUMENTSOBJECTS_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 "qv4object_p.h"
#include "qv4functionobject_p.h"

QT_BEGIN_NAMESPACE

namespace QV4 {

namespace Heap {

#define ArgumentsObjectMembers(class, Member) \
    Member(class, Pointer, CallContext *, context) \
    Member(class, NoMark, bool, fullyCreated) \
    Member(class, NoMark, uint, argCount) \
    Member(class, NoMark, quint64, mapped)

DECLARE_HEAP_OBJECT(ArgumentsObject, Object) {
    DECLARE_MARKOBJECTS(ArgumentsObject);
    enum {
        LengthPropertyIndex = 0,
        SymbolIteratorPropertyIndex = 1,
        CalleePropertyIndex = 2
    };
    void init(CppStackFrame *frame);
};

#define StrictArgumentsObjectMembers(class, Member)

DECLARE_HEAP_OBJECT(StrictArgumentsObject, Object) {
    enum {
        LengthPropertyIndex = 0,
        SymbolIteratorPropertyIndex = 1,
        CalleePropertyIndex = 2,
        CalleeSetterPropertyIndex = 3
    };
    void init(CppStackFrame *frame);
};

}

struct ArgumentsObject: Object {
    V4_OBJECT2(ArgumentsObject, Object)
    Q_MANAGED_TYPE(ArgumentsObject)

    Heap::CallContext *context() const { return d()->context; }
    bool fullyCreated() const { return d()->fullyCreated; }

    static bool isNonStrictArgumentsObject(Managed *m) {
        return m->vtable() == staticVTable();
    }

    static bool virtualDefineOwnProperty(Managed *m, PropertyKey id, const Property *desc, PropertyAttributes attrs);
    static ReturnedValue virtualGet(const Managed *m, PropertyKey id, const Value *receiver, bool *hasProperty);
    static bool virtualPut(Managed *m, PropertyKey id, const Value &value, Value *receiver);
    static bool virtualDeleteProperty(Managed *m, PropertyKey id);
    static PropertyAttributes virtualGetOwnProperty(const Managed *m, PropertyKey id, Property *p);
    static qint64 virtualGetLength(const Managed *m);
    static OwnPropertyKeyIterator *virtualOwnPropertyKeys(const Object *m, Value *target);

    void fullyCreate();

    // There's a slight hack here, as this limits the amount of mapped arguments to 64, but that should be
    // more than enough for all practical uses of arguments
    bool isMapped(uint arg) const {
        return arg < 64 && (d()->mapped & (1ull << arg));
    }

    void removeMapping(uint arg) {
        if (arg < 64)
            (d()->mapped &= ~(1ull << arg));
    }

};

struct StrictArgumentsObject : Object {
    V4_OBJECT2(StrictArgumentsObject, Object)
    Q_MANAGED_TYPE(ArgumentsObject)
};

}

QT_END_NAMESPACE

#endif