1 | // Copyright (C) 2018 The Qt Company Ltd. |
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
3 | #ifndef QV4ARRAYBUFFER_H |
4 | #define QV4ARRAYBUFFER_H |
5 | |
6 | // |
7 | // W A R N I N G |
8 | // ------------- |
9 | // |
10 | // This file is not part of the Qt API. It exists purely as an |
11 | // implementation detail. This header file may change from version to |
12 | // version without notice, or even be removed. |
13 | // |
14 | // We mean it. |
15 | // |
16 | |
17 | #include "qv4object_p.h" |
18 | #include "qv4functionobject_p.h" |
19 | #include <QtCore/qarraydatapointer.h> |
20 | |
21 | QT_BEGIN_NAMESPACE |
22 | |
23 | namespace QV4 { |
24 | |
25 | namespace Heap { |
26 | |
27 | struct SharedArrayBufferCtor : FunctionObject { |
28 | void init(QV4::ExecutionContext *scope); |
29 | }; |
30 | |
31 | struct ArrayBufferCtor : SharedArrayBufferCtor { |
32 | void init(QV4::ExecutionContext *scope); |
33 | }; |
34 | |
35 | struct Q_QML_PRIVATE_EXPORT SharedArrayBuffer : Object { |
36 | void init(size_t length); |
37 | void init(const QByteArray& array); |
38 | void destroy(); |
39 | |
40 | void setSharedArrayBuffer(bool shared) noexcept { isShared = shared; } |
41 | bool isSharedArrayBuffer() const noexcept { return isShared; } |
42 | |
43 | char *arrayData() noexcept { return arrayDataPointer()->data(); } |
44 | const char *constArrayData() const noexcept { return constArrayDataPointer()->data(); } |
45 | uint arrayDataLength() const noexcept { return constArrayDataPointer().size; } |
46 | |
47 | bool hasSharedArrayData() const noexcept { return constArrayDataPointer().isShared(); } |
48 | bool hasDetachedArrayData() const noexcept { return constArrayDataPointer().isNull(); } |
49 | void detachArrayData() noexcept { arrayDataPointer().clear(); } |
50 | |
51 | bool arrayDataNeedsDetach() const noexcept { return constArrayDataPointer().needsDetach(); } |
52 | |
53 | private: |
54 | const QArrayDataPointer<const char> &constArrayDataPointer() const noexcept |
55 | { |
56 | return *reinterpret_cast<const QArrayDataPointer<const char> *>(&arrayDataPointerStorage); |
57 | } |
58 | QArrayDataPointer<char> &arrayDataPointer() noexcept |
59 | { |
60 | return *reinterpret_cast<QArrayDataPointer<char> *>(&arrayDataPointerStorage); |
61 | } |
62 | |
63 | template <typename T> |
64 | struct storage_t { alignas(T) unsigned char data[sizeof(T)]; }; |
65 | |
66 | storage_t<QArrayDataPointer<char>> |
67 | arrayDataPointerStorage; |
68 | bool isShared; |
69 | }; |
70 | |
71 | struct Q_QML_PRIVATE_EXPORT ArrayBuffer : SharedArrayBuffer { |
72 | void init(size_t length) { |
73 | SharedArrayBuffer::init(length); |
74 | setSharedArrayBuffer(false); |
75 | } |
76 | void init(const QByteArray& array) { |
77 | SharedArrayBuffer::init(array); |
78 | setSharedArrayBuffer(false); |
79 | } |
80 | }; |
81 | |
82 | } |
83 | |
84 | struct SharedArrayBufferCtor : FunctionObject |
85 | { |
86 | V4_OBJECT2(SharedArrayBufferCtor, FunctionObject) |
87 | |
88 | static ReturnedValue virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *); |
89 | static ReturnedValue virtualCall(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc); |
90 | }; |
91 | |
92 | struct ArrayBufferCtor : SharedArrayBufferCtor |
93 | { |
94 | V4_OBJECT2(ArrayBufferCtor, SharedArrayBufferCtor) |
95 | |
96 | static ReturnedValue virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *); |
97 | |
98 | static ReturnedValue method_isView(const FunctionObject *, const Value *thisObject, const Value *argv, int argc); |
99 | }; |
100 | |
101 | struct Q_QML_PRIVATE_EXPORT SharedArrayBuffer : Object |
102 | { |
103 | V4_OBJECT2(SharedArrayBuffer, Object) |
104 | V4_NEEDS_DESTROY |
105 | V4_PROTOTYPE(sharedArrayBufferPrototype) |
106 | |
107 | QByteArray asByteArray() const; |
108 | |
109 | uint arrayDataLength() const { return d()->arrayDataLength(); } |
110 | char *arrayData() { return d()->arrayData(); } |
111 | const char *constArrayData() const { return d()->constArrayData(); } |
112 | |
113 | bool hasSharedArrayData() { return d()->hasSharedArrayData(); } |
114 | bool hasDetachedArrayData() const { return d()->hasDetachedArrayData(); } |
115 | bool isSharedArrayBuffer() const { return d()->isSharedArrayBuffer(); } |
116 | }; |
117 | |
118 | struct Q_QML_PRIVATE_EXPORT ArrayBuffer : SharedArrayBuffer |
119 | { |
120 | V4_OBJECT2(ArrayBuffer, SharedArrayBuffer) |
121 | V4_NEEDS_DESTROY |
122 | V4_PROTOTYPE(arrayBufferPrototype) |
123 | |
124 | QByteArray asByteArray() const; |
125 | uint arrayDataLength() const { return d()->arrayDataLength(); } |
126 | char *dataData() { if (d()->arrayDataNeedsDetach()) detach(); return d()->arrayData(); } |
127 | // ### is that detach needed? |
128 | const char *constArrayData() const { return d()->constArrayData(); } |
129 | bool hasSharedArrayData() { return d()->hasSharedArrayData(); } |
130 | void detachArrayData() { d()->detachArrayData(); } |
131 | |
132 | void detach(); |
133 | }; |
134 | |
135 | struct SharedArrayBufferPrototype : Object |
136 | { |
137 | void init(ExecutionEngine *engine, Object *ctor); |
138 | |
139 | static ReturnedValue method_get_byteLength(const FunctionObject *, const Value *thisObject, const Value *argv, int argc); |
140 | static ReturnedValue method_slice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc); |
141 | |
142 | static ReturnedValue slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc, bool shared); |
143 | }; |
144 | |
145 | struct ArrayBufferPrototype : SharedArrayBufferPrototype |
146 | { |
147 | void init(ExecutionEngine *engine, Object *ctor); |
148 | |
149 | static ReturnedValue method_get_byteLength(const FunctionObject *, const Value *thisObject, const Value *argv, int argc); |
150 | static ReturnedValue method_slice(const FunctionObject *, const Value *thisObject, const Value *argv, int argc); |
151 | static ReturnedValue method_toString(const FunctionObject *, const Value *thisObject, const Value *argv, int argc); |
152 | }; |
153 | |
154 | |
155 | } // namespace QV4 |
156 | |
157 | QT_END_NAMESPACE |
158 | |
159 | #endif |
160 | |