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// Copyright (C) 2018 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 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_PRIVATE_EXPORT bool isString() const;
Q_QML_PRIVATE_EXPORT bool isSymbol() const;
bool isCanonicalNumericIndexString() const;
Q_QML_PRIVATE_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
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