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39 | #include "qv4arraybuffer_p.h" |
40 | #include "qv4typedarray_p.h" |
41 | #include "qv4dataview_p.h" |
42 | #include "qv4string_p.h" |
43 | #include "qv4jscall_p.h" |
44 | #include "qv4symbol_p.h" |
45 | |
46 | using namespace QV4; |
47 | |
48 | DEFINE_OBJECT_VTABLE(SharedArrayBufferCtor); |
49 | DEFINE_OBJECT_VTABLE(ArrayBufferCtor); |
50 | DEFINE_OBJECT_VTABLE(SharedArrayBuffer); |
51 | DEFINE_OBJECT_VTABLE(ArrayBuffer); |
52 | |
53 | void Heap::SharedArrayBufferCtor::init(QV4::ExecutionContext *scope) |
54 | { |
55 | Heap::FunctionObject::init(scope, QStringLiteral("SharedArrayBuffer" )); |
56 | } |
57 | |
58 | void Heap::ArrayBufferCtor::init(QV4::ExecutionContext *scope) |
59 | { |
60 | Heap::FunctionObject::init(scope, QStringLiteral("ArrayBuffer" )); |
61 | } |
62 | |
63 | ReturnedValue SharedArrayBufferCtor::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget) |
64 | { |
65 | Scope scope(f); |
66 | if (newTarget->isUndefined()) |
67 | return scope.engine->throwTypeError(); |
68 | |
69 | qint64 len = argc ? argv[0].toIndex() : 0; |
70 | if (scope.engine->hasException) |
71 | return Encode::undefined(); |
72 | if (len < 0 || len >= INT_MAX) |
73 | return scope.engine->throwRangeError(QStringLiteral("SharedArrayBuffer: Invalid length." )); |
74 | |
75 | Scoped<SharedArrayBuffer> a(scope, scope.engine->memoryManager->allocate<SharedArrayBuffer>(args: len)); |
76 | if (scope.engine->hasException) |
77 | return Encode::undefined(); |
78 | |
79 | return a->asReturnedValue(); |
80 | } |
81 | |
82 | ReturnedValue SharedArrayBufferCtor::virtualCall(const FunctionObject *f, const Value *, const Value *, int) |
83 | { |
84 | return f->engine()->throwTypeError(); |
85 | } |
86 | |
87 | |
88 | ReturnedValue ArrayBufferCtor::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget) |
89 | { |
90 | ExecutionEngine *v4 = f->engine(); |
91 | Scope scope(v4); |
92 | |
93 | ScopedValue l(scope, argc ? argv[0] : Value::undefinedValue()); |
94 | double dl = l->toInteger(); |
95 | if (v4->hasException) |
96 | return Encode::undefined(); |
97 | uint len = (uint)qBound(min: 0., val: dl, max: (double)UINT_MAX); |
98 | if (len != dl) |
99 | return v4->throwRangeError(message: QLatin1String("ArrayBuffer constructor: invalid length" )); |
100 | |
101 | Scoped<ArrayBuffer> a(scope, v4->newArrayBuffer(length: len)); |
102 | if (newTarget->heapObject() != f->heapObject() && newTarget->isFunctionObject()) { |
103 | const FunctionObject *nt = static_cast<const FunctionObject *>(newTarget); |
104 | ScopedObject o(scope, nt->protoProperty()); |
105 | if (o) |
106 | a->setPrototypeOf(o); |
107 | } |
108 | if (scope.engine->hasException) |
109 | return Encode::undefined(); |
110 | |
111 | return a->asReturnedValue(); |
112 | } |
113 | |
114 | ReturnedValue ArrayBufferCtor::method_isView(const FunctionObject *, const Value *, const Value *argv, int argc) |
115 | { |
116 | if (argc < 1) |
117 | return Encode(false); |
118 | |
119 | if (argv[0].as<TypedArray>() || |
120 | argv[0].as<DataView>()) |
121 | return Encode(true); |
122 | |
123 | return Encode(false); |
124 | } |
125 | |
126 | |
127 | void Heap::SharedArrayBuffer::init(size_t length) |
128 | { |
129 | Object::init(); |
130 | if (length < UINT_MAX) |
131 | data = QTypedArrayData<char>::allocate(capacity: length + 1); |
132 | if (!data) { |
133 | internalClass->engine->throwRangeError(QStringLiteral("ArrayBuffer: out of memory" )); |
134 | return; |
135 | } |
136 | data->size = int(length); |
137 | memset(s: data->data(), c: 0, n: length + 1); |
138 | isShared = true; |
139 | } |
140 | |
141 | void Heap::SharedArrayBuffer::init(const QByteArray& array) |
142 | { |
143 | Object::init(); |
144 | data = const_cast<QByteArray&>(array).data_ptr(); |
145 | data->ref.ref(); |
146 | isShared = true; |
147 | } |
148 | |
149 | void Heap::SharedArrayBuffer::destroy() |
150 | { |
151 | if (data && !data->ref.deref()) |
152 | QTypedArrayData<char>::deallocate(data); |
153 | Object::destroy(); |
154 | } |
155 | |
156 | QByteArray ArrayBuffer::asByteArray() const |
157 | { |
158 | QByteArrayDataPtr ba = { .ptr: d()->data }; |
159 | ba.ptr->ref.ref(); |
160 | return QByteArray(ba); |
161 | } |
162 | |
163 | void ArrayBuffer::detach() { |
164 | if (!d()->data->ref.isShared()) |
165 | return; |
166 | |
167 | QTypedArrayData<char> *oldData = d()->data; |
168 | |
169 | d()->data = QTypedArrayData<char>::allocate(capacity: oldData->size + 1); |
170 | if (!d()->data) { |
171 | engine()->throwRangeError(QStringLiteral("ArrayBuffer: out of memory" )); |
172 | return; |
173 | } |
174 | |
175 | memcpy(dest: d()->data->data(), src: oldData->data(), n: oldData->size + 1); |
176 | |
177 | if (!oldData->ref.deref()) |
178 | QTypedArrayData<char>::deallocate(data: oldData); |
179 | } |
180 | |
181 | |
182 | void SharedArrayBufferPrototype::init(ExecutionEngine *engine, Object *ctor) |
183 | { |
184 | Scope scope(engine); |
185 | ScopedObject o(scope); |
186 | ctor->defineReadonlyConfigurableProperty(name: engine->id_length(), value: Value::fromInt32(i: 1)); |
187 | ctor->defineReadonlyProperty(name: engine->id_prototype(), value: (o = this)); |
188 | ctor->addSymbolSpecies(); |
189 | |
190 | defineDefaultProperty(name: engine->id_constructor(), value: (o = ctor)); |
191 | defineAccessorProperty(QStringLiteral("byteLength" ), getter: method_get_byteLength, setter: nullptr); |
192 | defineDefaultProperty(QStringLiteral("slice" ), code: method_slice, argumentCount: 2); |
193 | ScopedString name(scope, engine->newString(QStringLiteral("SharedArrayBuffer" ))); |
194 | defineReadonlyConfigurableProperty(name: scope.engine->symbol_toStringTag(), value: name); |
195 | } |
196 | |
197 | ReturnedValue SharedArrayBufferPrototype::method_get_byteLength(const FunctionObject *b, const Value *thisObject, const Value *, int) |
198 | { |
199 | const SharedArrayBuffer *a = thisObject->as<SharedArrayBuffer>(); |
200 | if (!a || a->isDetachedBuffer() || !a->isSharedArrayBuffer()) |
201 | return b->engine()->throwTypeError(); |
202 | |
203 | return Encode(a->d()->data->size); |
204 | } |
205 | |
206 | ReturnedValue SharedArrayBufferPrototype::method_slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc) |
207 | { |
208 | return slice(b, thisObject, argv, argc, shared: true); |
209 | } |
210 | |
211 | ReturnedValue SharedArrayBufferPrototype::slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc, bool shared) |
212 | { |
213 | Scope scope(b); |
214 | const SharedArrayBuffer *a = thisObject->as<SharedArrayBuffer>(); |
215 | if (!a || a->isDetachedBuffer() || (a->isSharedArrayBuffer() != shared)) |
216 | return scope.engine->throwTypeError(); |
217 | |
218 | double start = argc > 0 ? argv[0].toInteger() : 0; |
219 | double end = (argc < 2 || argv[1].isUndefined()) ? |
220 | a->d()->data->size : argv[1].toInteger(); |
221 | if (scope.hasException()) |
222 | return QV4::Encode::undefined(); |
223 | |
224 | double first = (start < 0) ? qMax(a: a->d()->data->size + start, b: 0.) : qMin(a: start, b: (double)a->d()->data->size); |
225 | double final = (end < 0) ? qMax(a: a->d()->data->size + end, b: 0.) : qMin(a: end, b: (double)a->d()->data->size); |
226 | |
227 | const FunctionObject *constructor = a->speciesConstructor(scope, defaultConstructor: shared ? scope.engine->sharedArrayBufferCtor() : scope.engine->arrayBufferCtor()); |
228 | if (!constructor) |
229 | return scope.engine->throwTypeError(); |
230 | |
231 | double newLen = qMax(a: final - first, b: 0.); |
232 | ScopedValue argument(scope, QV4::Encode(newLen)); |
233 | QV4::Scoped<SharedArrayBuffer> newBuffer(scope, constructor->callAsConstructor(argv: argument, argc: 1)); |
234 | if (!newBuffer || newBuffer->d()->data->size < (int)newLen || |
235 | newBuffer->isDetachedBuffer() || (newBuffer->isSharedArrayBuffer() != shared) || |
236 | newBuffer->sameValue(other: *a) || |
237 | a->isDetachedBuffer()) |
238 | return scope.engine->throwTypeError(); |
239 | |
240 | memcpy(dest: newBuffer->d()->data->data(), src: a->d()->data->data() + (uint)first, n: newLen); |
241 | return newBuffer->asReturnedValue(); |
242 | } |
243 | |
244 | |
245 | void ArrayBufferPrototype::init(ExecutionEngine *engine, Object *ctor) |
246 | { |
247 | Scope scope(engine); |
248 | ScopedObject o(scope); |
249 | ctor->defineReadonlyConfigurableProperty(name: engine->id_length(), value: Value::fromInt32(i: 1)); |
250 | ctor->defineReadonlyProperty(name: engine->id_prototype(), value: (o = this)); |
251 | ctor->defineDefaultProperty(QStringLiteral("isView" ), code: ArrayBufferCtor::method_isView, argumentCount: 1); |
252 | ctor->addSymbolSpecies(); |
253 | |
254 | defineDefaultProperty(name: engine->id_constructor(), value: (o = ctor)); |
255 | defineAccessorProperty(QStringLiteral("byteLength" ), getter: method_get_byteLength, setter: nullptr); |
256 | defineDefaultProperty(QStringLiteral("slice" ), code: method_slice, argumentCount: 2); |
257 | defineDefaultProperty(QStringLiteral("toString" ), code: method_toString, argumentCount: 0); |
258 | ScopedString name(scope, engine->newString(QStringLiteral("ArrayBuffer" ))); |
259 | defineReadonlyConfigurableProperty(name: scope.engine->symbol_toStringTag(), value: name); |
260 | } |
261 | |
262 | ReturnedValue ArrayBufferPrototype::method_get_byteLength(const FunctionObject *f, const Value *thisObject, const Value *, int) |
263 | { |
264 | const ArrayBuffer *a = thisObject->as<ArrayBuffer>(); |
265 | if (!a || a->isDetachedBuffer() || a->isSharedArrayBuffer()) |
266 | return f->engine()->throwTypeError(); |
267 | |
268 | return Encode(a->d()->data->size); |
269 | } |
270 | |
271 | ReturnedValue ArrayBufferPrototype::method_slice(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc) |
272 | { |
273 | return slice(b, thisObject, argv, argc, shared: false); |
274 | } |
275 | |
276 | ReturnedValue ArrayBufferPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int) |
277 | { |
278 | ExecutionEngine *v4 = b->engine(); |
279 | const ArrayBuffer *a = thisObject->as<ArrayBuffer>(); |
280 | if (!a) |
281 | RETURN_UNDEFINED(); |
282 | return Encode(v4->newString(s: QString::fromUtf8(str: a->asByteArray()))); |
283 | } |
284 | |