inline ArrayBuffer* toArrayBufferView(JSValue value)
{
JSArrayBufferView* wrapper = jsDynamicCast<JSArrayBufferView*>(value);
if (!wrapper)
return 0;
return wrapper->buffer();
}
bool ArrayBuffer::transfer(ArrayBufferContents& result)
{
Ref<ArrayBuffer> protect(*this);
if (!m_contents.m_data) {
result.m_data = 0;
return false;
}
bool isNeuterable = !m_pinCount;
if (isNeuterable)
m_contents.transfer(result);
else {
m_contents.copyTo(result);
if (!result.m_data)
return false;
}
for (size_t i = numberOfIncomingReferences(); i--;) {
JSArrayBufferView* view = jsDynamicCast<JSArrayBufferView*>(incomingReferenceAt(i));
if (view)
view->neuter();
}
return true;
}
void JSArrayBufferView::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSArrayBufferView* thisObject = jsCast<JSArrayBufferView*>(cell);
if (thisObject->hasArrayBuffer()) {
ArrayBuffer* buffer = thisObject->buffer();
RELEASE_ASSERT(buffer);
visitor.addOpaqueRoot(buffer);
}
Base::visitChildren(thisObject, visitor);
}
EncodedJSValue JSC_HOST_CALL typedArrayViewPrivateFuncLength(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue argument = exec->argument(0);
if (!argument.isCell() || !isTypedView(argument.asCell()->classInfo()->typedArrayStorageType))
return throwVMTypeError(exec, scope, ASCIILiteral("Receiver should be a typed array view"));
JSArrayBufferView* thisObject = jsCast<JSArrayBufferView*>(argument);
if (thisObject->isNeutered())
return throwVMTypeError(exec, scope, ASCIILiteral("Underlying ArrayBuffer has been detached from the view"));
return JSValue::encode(jsNumber(thisObject->length()));
}
static EncodedJSValue JSC_HOST_CALL constructJSWebAssemblyModule(ExecState* state)
{
VM& vm = state->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue val = state->argument(0);
// If the given bytes argument is not a BufferSource, a TypeError exception is thrown.
JSArrayBuffer* arrayBuffer = val.getObject() ? jsDynamicCast<JSArrayBuffer*>(val.getObject()) : nullptr;
JSArrayBufferView* arrayBufferView = val.getObject() ? jsDynamicCast<JSArrayBufferView*>(val.getObject()) : nullptr;
if (!(arrayBuffer || arrayBufferView))
return JSValue::encode(throwException(state, scope, createTypeError(state, ASCIILiteral("first argument to WebAssembly.Module must be an ArrayBufferView or an ArrayBuffer"), defaultSourceAppender, runtimeTypeForValue(val))));
if (arrayBufferView ? arrayBufferView->isNeutered() : arrayBuffer->impl()->isNeutered())
return JSValue::encode(throwException(state, scope, createTypeError(state, ASCIILiteral("underlying TypedArray has been detatched from the ArrayBuffer"), defaultSourceAppender, runtimeTypeForValue(val))));
size_t byteOffset = arrayBufferView ? arrayBufferView->byteOffset() : 0;
size_t byteSize = arrayBufferView ? arrayBufferView->length() : arrayBuffer->impl()->byteLength();
const auto* base = arrayBufferView ? static_cast<uint8_t*>(arrayBufferView->vector()) : static_cast<uint8_t*>(arrayBuffer->impl()->data());
Wasm::Plan plan(&vm, base + byteOffset, byteSize);
// On failure, a new WebAssembly.CompileError is thrown.
plan.run();
if (plan.failed())
return JSValue::encode(throwException(state, scope, createWebAssemblyCompileError(state, plan.errorMessage())));
// On success, a new WebAssembly.Module object is returned with [[Module]] set to the validated Ast.module.
auto* structure = InternalFunction::createSubclassStructure(state, state->newTarget(), asInternalFunction(state->jsCallee())->globalObject()->WebAssemblyModuleStructure());
RETURN_IF_EXCEPTION(scope, { });
// The export symbol table is the same for all Instances of a Module.
SymbolTable* exportSymbolTable = SymbolTable::create(vm);
for (auto& exp : plan.exports()) {
auto offset = exportSymbolTable->takeNextScopeOffset(NoLockingNecessary);
exportSymbolTable->set(NoLockingNecessary, exp.field.impl(), SymbolTableEntry(VarOffset(offset)));
}
// Only wasm-internal functions have a callee, stubs to JS do not.
unsigned calleeCount = plan.internalFunctionCount();
JSWebAssemblyModule* result = JSWebAssemblyModule::create(vm, structure, plan.takeModuleInformation(), plan.takeCallLinkInfos(), plan.takeWasmToJSStubs(), plan.takeFunctionIndexSpace(), exportSymbolTable, calleeCount);
plan.initializeCallees(state->jsCallee()->globalObject(),
[&] (unsigned calleeIndex, JSWebAssemblyCallee* jsEntrypointCallee, JSWebAssemblyCallee* wasmEntrypointCallee) {
result->setJSEntrypointCallee(vm, calleeIndex, jsEntrypointCallee);
result->setWasmEntrypointCallee(vm, calleeIndex, wasmEntrypointCallee);
});
return JSValue::encode(result);
}
bool JSArrayBufferView::getOwnPropertySlot(
JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
JSArrayBufferView* thisObject = jsCast<JSArrayBufferView*>(object);
if (propertyName == exec->propertyNames().byteOffset) {
slot.setValue(thisObject, DontDelete | ReadOnly, jsNumber(thisObject->byteOffset()));
return true;
}
if (propertyName == exec->propertyNames().buffer) {
slot.setValue(
thisObject, DontDelete | ReadOnly, exec->vm().m_typedArrayController->toJS(
exec, thisObject->globalObject(), thisObject->buffer()));
return true;
}
return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
}
