qv4calldata_p.h

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// Copyright (C) 2019 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
 
#ifndef QV4CALLDATA_P_H
#define QV4CALLDATA_P_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/qv4staticvalue_p.h>
 
QT_BEGIN_NAMESPACE
 
namespace QV4 {
 
struct CallData
{
    enum Offsets {
        Function = 0,
        Context = 1,
        Accumulator = 2,
        This = 3,
        NewTarget = 4,
        Argc = 5,
 
        LastOffset = Argc,
        OffsetCount = LastOffset + 1
    };
 
    StaticValue function;
    StaticValue context;
    StaticValue accumulator;
    StaticValue thisObject;
    StaticValue newTarget;
    StaticValue _argc;
 
    int argc() const {
        Q_ASSERT(_argc.isInteger());
        return _argc.int_32();
    }
 
    void setArgc(int argc) {
        Q_ASSERT(argc >= 0);
        _argc.setInt_32(argc);
    }
 
    inline ReturnedValue argument(int i) const {
        return i < argc() ? args[i].asReturnedValue()
                          : StaticValue::undefinedValue().asReturnedValue();
    }
 
    StaticValue args[1];
 
    static constexpr int HeaderSize()
    {
        return offsetof(CallData, args) / sizeof(QV4::StaticValue);
    }
 
    template<typename Value>
    Value *argValues();
 
    template<typename Value>
    const Value *argValues() const;
};
 
Q_STATIC_ASSERT(std::is_standard_layout<CallData>::value);
Q_STATIC_ASSERT(offsetof(CallData, function   ) == CallData::Function    * sizeof(StaticValue));
Q_STATIC_ASSERT(offsetof(CallData, context    ) == CallData::Context     * sizeof(StaticValue));
Q_STATIC_ASSERT(offsetof(CallData, accumulator) == CallData::Accumulator * sizeof(StaticValue));
Q_STATIC_ASSERT(offsetof(CallData, thisObject ) == CallData::This        * sizeof(StaticValue));
Q_STATIC_ASSERT(offsetof(CallData, newTarget  ) == CallData::NewTarget   * sizeof(StaticValue));
Q_STATIC_ASSERT(offsetof(CallData, _argc      ) == CallData::Argc        * sizeof(StaticValue));
Q_STATIC_ASSERT(offsetof(CallData, args       ) == 6 * sizeof(StaticValue));
 
} // namespace QV4
 
QT_END_NAMESPACE
 
#endif // QV4CALLDATA_P_H