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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 QV4ARRAYBUFFER_H
#define QV4ARRAYBUFFER_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"
#include <QtCore/qarraydatapointer.h>
QT_BEGIN_NAMESPACE
namespace QV4 {
namespace Heap {
struct SharedArrayBufferCtor : FunctionObject {
void init(QV4::ExecutionContext *scope);
};
struct ArrayBufferCtor : SharedArrayBufferCtor {
void init(QV4::ExecutionContext *scope);
};
struct Q_QML_EXPORT SharedArrayBuffer : Object {
void init(size_t length);
void init(const QByteArray& array);
void destroy();
void setSharedArrayBuffer(bool shared) noexcept { isShared = shared; }
bool isSharedArrayBuffer() const noexcept { return isShared; }
char *arrayData() noexcept { return arrayDataPointer()->data(); }
const char *constArrayData() const noexcept { return constArrayDataPointer()->data(); }
uint arrayDataLength() const noexcept { return constArrayDataPointer().size; }
bool hasSharedArrayData() const noexcept { return constArrayDataPointer().isShared(); }
bool hasDetachedArrayData() const noexcept { return constArrayDataPointer().isNull(); }
void detachArrayData() noexcept { arrayDataPointer().clear(); }
bool arrayDataNeedsDetach() const noexcept { return constArrayDataPointer().needsDetach(); }
private:
const QArrayDataPointer<const char> &constArrayDataPointer() const noexcept
{
return *reinterpret_cast<const QArrayDataPointer<const char> *>(&arrayDataPointerStorage);
}
QArrayDataPointer<char> &arrayDataPointer() noexcept
{
return *reinterpret_cast<QArrayDataPointer<char> *>(&arrayDataPointerStorage);
}
template <typename T>
struct storage_t { alignas(T) unsigned char data[sizeof(T)]; };
storage_t<QArrayDataPointer<char>>
arrayDataPointerStorage;
bool isShared;
};
struct Q_QML_EXPORT ArrayBuffer : SharedArrayBuffer {
void init(size_t length) {
SharedArrayBuffer::init(length);
setSharedArrayBuffer(false);
}
void init(const QByteArray& array) {
SharedArrayBuffer::init(array);
setSharedArrayBuffer(false);
}
};
}
struct SharedArrayBufferCtor : FunctionObject
{
V4_OBJECT2(SharedArrayBufferCtor, FunctionObject)
static ReturnedValue virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *);
static ReturnedValue virtualCall(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
};
struct ArrayBufferCtor : SharedArrayBufferCtor
{
V4_OBJECT2(ArrayBufferCtor, SharedArrayBufferCtor)
static ReturnedValue virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *);
static ReturnedValue method_isView(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
};
struct Q_QML_EXPORT SharedArrayBuffer : Object
{
V4_OBJECT2(SharedArrayBuffer, Object)
V4_NEEDS_DESTROY
V4_PROTOTYPE(sharedArrayBufferPrototype)
QByteArray asByteArray() const;
uint arrayDataLength() const { return d()->arrayDataLength(); }
char *arrayData() { return d()->arrayData(); }
const char *constArrayData() const { return d()->constArrayData(); }
bool hasSharedArrayData() { return d()->hasSharedArrayData(); }
bool hasDetachedArrayData() const { return d()->hasDetachedArrayData(); }
bool isSharedArrayBuffer() const { return d()->isSharedArrayBuffer(); }
};
struct Q_QML_EXPORT ArrayBuffer : SharedArrayBuffer
{
V4_OBJECT2(ArrayBuffer, SharedArrayBuffer)
V4_NEEDS_DESTROY
V4_PROTOTYPE(arrayBufferPrototype)
QByteArray asByteArray() const;
uint arrayDataLength() const { return d()->arrayDataLength(); }
char *dataData() { if (d()->arrayDataNeedsDetach()) detach(); return d()->arrayData(); }
// ### is that detach needed?
const char *constArrayData() const { return d()->constArrayData(); }
bool hasSharedArrayData() { return d()->hasSharedArrayData(); }
void detachArrayData() { d()->detachArrayData(); }
void detach();
};
struct SharedArrayBufferPrototype : Object
{
void init(ExecutionEngine *engine, Object *ctor);
static ReturnedValue method_get_byteLength(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
static ReturnedValue method_slice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
static ReturnedValue slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc, bool shared);
};
struct ArrayBufferPrototype : SharedArrayBufferPrototype
{
void init(ExecutionEngine *engine, Object *ctor);
static ReturnedValue method_get_byteLength(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
static ReturnedValue method_slice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
};
} // namespace QV4
QT_END_NAMESPACE
#endif
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