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// Copyright (C) 2022 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QNATIVEIPCKEY_H
#define QNATIVEIPCKEY_H
#include <QtCore/qglobal.h>
#include <QtCore/qtcore-config.h>
#if QT_CONFIG(sharedmemory) || QT_CONFIG(systemsemaphore)
# include <QtCore/qstring.h>
# include <QtCore/qobjectdefs.h>
QT_BEGIN_NAMESPACE
class QNativeIpcKeyPrivate;
class QNativeIpcKey
{
Q_GADGET_EXPORT(Q_CORE_EXPORT)
public:
enum class Type : quintptr {
// 0 is reserved for the invalid type
// keep 1 through 0xff free, except for SystemV
SystemV = 0x51, // 'Q'
PosixRealtime = 0x100,
Windows,
};
Q_ENUM(Type)
static constexpr Type DefaultTypeForOs =
#ifdef Q_OS_WIN
Type::Windows
#else
Type::PosixRealtime
#endif
;
static Type legacyDefaultTypeForOs() noexcept;
explicit constexpr QNativeIpcKey(Type type = DefaultTypeForOs) noexcept
: d()
{
typeAndFlags.type = type;
}
Q_IMPLICIT QNativeIpcKey(const QString &k, Type type = DefaultTypeForOs)
: d(), key(k)
{
typeAndFlags.type = type;
}
QNativeIpcKey(const QNativeIpcKey &other)
: d(other.d), key(other.key)
{
if (isSlowPath())
copy_internal(other);
}
QNativeIpcKey(QNativeIpcKey &&other) noexcept
: d(std::exchange(other.d, 0)), key(std::move(other.key))
{
if (isSlowPath())
move_internal(std::move(other));
}
~QNativeIpcKey()
{
if (isSlowPath())
destroy_internal();
}
QNativeIpcKey &operator=(const QNativeIpcKey &other)
{
key = other.key;
if (isSlowPath() || other.isSlowPath())
return assign_internal(other);
d = other.d;
return *this;
}
QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QNativeIpcKey)
void swap(QNativeIpcKey &other)
{
std::swap(d, other.d);
key.swap(other.key);
}
bool isEmpty() const
{
return key.isEmpty();
}
bool isValid() const
{
return type() != Type{};
}
constexpr Type type() const noexcept
{
if (isSlowPath())
return type_internal();
return typeAndFlags.type;
}
constexpr void setType(Type type)
{
if (isSlowPath())
return setType_internal(type);
typeAndFlags.type = type;
}
QString nativeKey() const noexcept
{ return key; }
void setNativeKey(const QString &newKey)
{
key = newKey;
if (isSlowPath())
setNativeKey_internal(newKey);
}
Q_CORE_EXPORT QString toString() const;
Q_CORE_EXPORT static QNativeIpcKey fromString(const QString &string);
private:
struct TypeAndFlags {
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
// this is the LSB
quintptr isExtended : 1;
Type type : 15;
#endif
quintptr reserved : sizeof(quintptr) * 8 - 16;
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
Type type : 15;
quint16 isExtended : 1;
// this was the LSB
#endif
};
// Bit 0: if set, holds a pointer (with the LSB set); if clear, holds the
// the TypeAndFlags structure.
union {
quintptr d = 0;
TypeAndFlags typeAndFlags;
static_assert(sizeof(typeAndFlags) == sizeof(d));
};
QString key;
friend class QNativeIpcKeyPrivate;
QNativeIpcKeyPrivate *d_func();
const QNativeIpcKeyPrivate *d_func() const;
constexpr bool isSlowPath() const noexcept
{ return Q_UNLIKELY(typeAndFlags.isExtended); }
friend bool operator==(const QNativeIpcKey &lhs, const QNativeIpcKey &rhs) noexcept
{
if (lhs.key != rhs.key)
return false;
if (lhs.d == rhs.d)
return true;
if (lhs.isSlowPath() && rhs.isSlowPath())
return compare_internal(lhs, rhs) == 0;
return lhs.d == rhs.d;
}
friend bool operator!=(const QNativeIpcKey &lhs, const QNativeIpcKey &rhs) noexcept
{
return !(lhs == rhs);
}
Q_CORE_EXPORT void copy_internal(const QNativeIpcKey &other);
Q_CORE_EXPORT void move_internal(QNativeIpcKey &&other) noexcept;
Q_CORE_EXPORT QNativeIpcKey &assign_internal(const QNativeIpcKey &other);
Q_CORE_EXPORT void destroy_internal() noexcept;
Q_DECL_PURE_FUNCTION Q_CORE_EXPORT Type type_internal() const noexcept;
Q_CORE_EXPORT void setType_internal(Type);
Q_CORE_EXPORT void setNativeKey_internal(const QString &);
Q_DECL_PURE_FUNCTION Q_CORE_EXPORT static int
compare_internal(const QNativeIpcKey &lhs, const QNativeIpcKey &rhs) noexcept;
#ifdef Q_OS_DARWIN
Q_DECL_CONST_FUNCTION Q_CORE_EXPORT static Type defaultTypeForOs_internal() noexcept;
#endif
};
// not a shared type, exactly, but this works too
Q_DECLARE_SHARED(QNativeIpcKey)
inline auto QNativeIpcKey::legacyDefaultTypeForOs() noexcept -> Type
{
#if defined(Q_OS_WIN)
return Type::Windows;
#elif defined(QT_POSIX_IPC)
return Type::PosixRealtime;
#elif defined(Q_OS_DARWIN)
return defaultTypeForOs_internal();
#else
return Type::SystemV;
#endif
}
#endif // QT_CONFIG(sharedmemory) || QT_CONFIG(systemsemaphore)
QT_END_NAMESPACE
#endif // QNATIVEIPCKEY_H
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