JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / runtime / JSArrayBufferConstructor.cpp

diff --git a/runtime/JSArrayBufferConstructor.cpp b/runtime/JSArrayBufferConstructor.cpp
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+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "JSArrayBufferConstructor.h"
+
+#include "Error.h"
+#include "ExceptionHelpers.h"
+#include "JSArrayBuffer.h"
+#include "JSArrayBufferPrototype.h"
+#include "JSGlobalObject.h"
+#include "JSCInlines.h"
+
+namespace JSC {
+
+static EncodedJSValue JSC_HOST_CALL arrayBufferFuncIsView(ExecState*);
+
+const ClassInfo JSArrayBufferConstructor::s_info = {
+    "Function", &Base::s_info, 0, 0,
+    CREATE_METHOD_TABLE(JSArrayBufferConstructor)
+};
+
+JSArrayBufferConstructor::JSArrayBufferConstructor(VM& vm, Structure* structure)
+    : Base(vm, structure)
+{
+}
+
+void JSArrayBufferConstructor::finishCreation(VM& vm, JSArrayBufferPrototype* prototype)
+{
+    Base::finishCreation(vm, "ArrayBuffer");
+    putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
+    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), DontEnum | DontDelete | ReadOnly);
+
+    JSGlobalObject* globalObject = this->globalObject();
+    JSC_NATIVE_FUNCTION(vm.propertyNames->isView, arrayBufferFuncIsView, DontEnum, 1);
+}
+
+JSArrayBufferConstructor* JSArrayBufferConstructor::create(VM& vm, Structure* structure, JSArrayBufferPrototype* prototype)
+{
+    JSArrayBufferConstructor* result =
+        new (NotNull, allocateCell<JSArrayBufferConstructor>(vm.heap))
+        JSArrayBufferConstructor(vm, structure);
+    result->finishCreation(vm, prototype);
+    return result;
+}
+
+Structure* JSArrayBufferConstructor::createStructure(
+    VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+{
+    return Structure::create(
+        vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
+}
+
+static EncodedJSValue JSC_HOST_CALL constructArrayBuffer(ExecState* exec)
+{
+    JSArrayBufferConstructor* constructor =
+        jsCast<JSArrayBufferConstructor*>(exec->callee());
+    
+    unsigned length;
+    if (exec->argumentCount()) {
+        length = exec->uncheckedArgument(0).toUInt32(exec);
+        if (exec->hadException())
+            return JSValue::encode(jsUndefined());
+    } else {
+        // Although the documentation doesn't say so, it is in fact correct to say
+        // "new ArrayBuffer()". The result is the same as allocating an array buffer
+        // with a zero length.
+        length = 0;
+    }
+    
+    RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, 1);
+    if (!buffer)
+        return throwVMError(exec, createOutOfMemoryError(constructor->globalObject()));
+    
+    JSArrayBuffer* result = JSArrayBuffer::create(
+        exec->vm(), constructor->globalObject()->arrayBufferStructure(), buffer);
+    
+    return JSValue::encode(result);
+}
+
+ConstructType JSArrayBufferConstructor::getConstructData(
+    JSCell*, ConstructData& constructData)
+{
+    constructData.native.function = constructArrayBuffer;
+    return ConstructTypeHost;
+}
+
+CallType JSArrayBufferConstructor::getCallData(JSCell*, CallData& callData)
+{
+    callData.native.function = constructArrayBuffer;
+    return CallTypeHost;
+}
+
+// ------------------------------ Functions --------------------------------
+
+// ECMA 24.1.3.1
+EncodedJSValue JSC_HOST_CALL arrayBufferFuncIsView(ExecState* exec)
+{
+    return JSValue::encode(jsBoolean(jsDynamicCast<JSArrayBufferView*>(exec->argument(0))));
+}
+    
+
+} // namespace JSC
+