| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | #ifndef QV4WRITEBARRIER_P_H |
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| 4 | #define QV4WRITEBARRIER_P_H |
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| 5 | |
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| 6 | // |
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| 7 | // W A R N I N G |
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| 8 | // ------------- |
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| 9 | // |
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| 10 | // This file is not part of the Qt API. It exists purely as an |
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| 11 | // implementation detail. This header file may change from version to |
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| 12 | // version without notice, or even be removed. |
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| 13 | // |
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| 14 | // We mean it. |
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| 15 | // |
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| 16 | |
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| 17 | #include <private/qv4global_p.h> |
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| 18 | |
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| 19 | QT_BEGIN_NAMESPACE |
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| 20 | |
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| 21 | #define WRITEBARRIER_none 1 |
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| 22 | |
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| 23 | #define WRITEBARRIER(x) (1/WRITEBARRIER_##x == 1) |
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| 24 | |
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| 25 | namespace QV4 { |
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| 26 | struct EngineBase; |
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| 27 | |
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| 28 | namespace WriteBarrier { |
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| 29 | |
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| 30 | enum Type { |
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| 31 | NoBarrier, |
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| 32 | Barrier |
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| 33 | }; |
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| 34 | |
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| 35 | enum NewValueType { |
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| 36 | Primitive, |
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| 37 | Object, |
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| 38 | Unknown |
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| 39 | }; |
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| 40 | |
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| 41 | // ### this needs to be filled with a real memory fence once marking is concurrent |
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| 42 | Q_ALWAYS_INLINE void fence() {} |
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| 43 | |
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| 44 | #if WRITEBARRIER(none) |
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| 45 | |
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| 46 | template <NewValueType type> |
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| 47 | static constexpr inline bool isRequired() { |
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| 48 | return false; |
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| 49 | } |
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| 50 | |
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| 51 | inline void write(EngineBase *engine, Heap::Base *base, ReturnedValue *slot, ReturnedValue value) |
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| 52 | { |
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| 53 | Q_UNUSED(engine); |
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| 54 | Q_UNUSED(base); |
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| 55 | *slot = value; |
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| 56 | } |
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| 57 | |
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| 58 | inline void write(EngineBase *engine, Heap::Base *base, Heap::Base **slot, Heap::Base *value) |
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| 59 | { |
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| 60 | Q_UNUSED(engine); |
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| 61 | Q_UNUSED(base); |
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| 62 | *slot = value; |
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| 63 | } |
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| 64 | |
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| 65 | #endif |
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| 66 | |
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| 67 | } |
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| 68 | |
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| 69 | } |
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| 70 | |
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| 71 | QT_END_NAMESPACE |
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| 72 | |
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| 73 | #endif |
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| 74 | |
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