webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 129 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/SymbolConstructor.cpp b/Source/JavaScriptCore/runtime/SymbolConstructor.cpp
new file mode 100644
index 000000000..2c59b3517
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/SymbolConstructor.cpp
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2012, 2016 Apple Inc. All rights reserved.
+ * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * 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. AND ITS CONTRIBUTORS ``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 ITS 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 "SymbolConstructor.h"
+
+#include "Error.h"
+#include "JSCInlines.h"
+#include "JSGlobalObject.h"
+#include "Symbol.h"
+#include "SymbolPrototype.h"
+#include <wtf/text/SymbolRegistry.h>
+
+namespace JSC {
+
+static EncodedJSValue JSC_HOST_CALL symbolConstructorFor(ExecState*);
+static EncodedJSValue JSC_HOST_CALL symbolConstructorKeyFor(ExecState*);
+
+}
+
+#include "SymbolConstructor.lut.h"
+
+namespace JSC {
+
+STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(SymbolConstructor);
+
+const ClassInfo SymbolConstructor::s_info = { "Function", &Base::s_info, &symbolConstructorTable, CREATE_METHOD_TABLE(SymbolConstructor) };
+
+/* Source for SymbolConstructor.lut.h
+@begin symbolConstructorTable
+  for       symbolConstructorFor       DontEnum|Function 1
+  keyFor    symbolConstructorKeyFor    DontEnum|Function 1
+@end
+*/
+
+SymbolConstructor::SymbolConstructor(VM& vm, Structure* structure)
+    : InternalFunction(vm, structure)
+{
+}
+
+#define INITIALIZE_WELL_KNOWN_SYMBOLS(name) \
+    putDirectWithoutTransition(vm, Identifier::fromString(&vm, #name), Symbol::create(vm, static_cast<SymbolImpl&>(*vm.propertyNames->name##Symbol.impl())), DontEnum | DontDelete | ReadOnly);
+
+void SymbolConstructor::finishCreation(VM& vm, SymbolPrototype* prototype)
+{
+    Base::finishCreation(vm, prototype->classInfo(vm)->className);
+    putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
+    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(0), DontDelete | ReadOnly | DontEnum);
+
+    JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_WELL_KNOWN_SYMBOLS)
+}
+
+// ------------------------------ Functions ---------------------------
+
+static EncodedJSValue JSC_HOST_CALL callSymbol(ExecState* exec)
+{
+    JSValue description = exec->argument(0);
+    if (description.isUndefined())
+        return JSValue::encode(Symbol::create(exec->vm()));
+    return JSValue::encode(Symbol::create(exec, description.toString(exec)));
+}
+
+ConstructType SymbolConstructor::getConstructData(JSCell*, ConstructData&)
+{
+    return ConstructType::None;
+}
+
+CallType SymbolConstructor::getCallData(JSCell*, CallData& callData)
+{
+    callData.native.function = callSymbol;
+    return CallType::Host;
+}
+
+EncodedJSValue JSC_HOST_CALL symbolConstructorFor(ExecState* exec)
+{
+    VM& vm = exec->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    JSString* stringKey = exec->argument(0).toString(exec);
+    RETURN_IF_EXCEPTION(scope, encodedJSValue());
+    String string = stringKey->value(exec);
+    RETURN_IF_EXCEPTION(scope, encodedJSValue());
+
+    return JSValue::encode(Symbol::create(exec->vm(), exec->vm().symbolRegistry().symbolForKey(string)));
+}
+
+const char* const SymbolKeyForTypeError = "Symbol.keyFor requires that the first argument be a symbol";
+
+EncodedJSValue JSC_HOST_CALL symbolConstructorKeyFor(ExecState* exec)
+{
+    VM& vm = exec->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    JSValue symbolValue = exec->argument(0);
+    if (!symbolValue.isSymbol())
+        return JSValue::encode(throwTypeError(exec, scope, ASCIILiteral(SymbolKeyForTypeError)));
+
+    SymbolImpl& uid = asSymbol(symbolValue)->privateName().uid();
+    if (!uid.symbolRegistry())
+        return JSValue::encode(jsUndefined());
+
+    ASSERT(uid.symbolRegistry() == &vm.symbolRegistry());
+    return JSValue::encode(jsString(exec, vm.symbolRegistry().keyForSymbol(uid)));
+}
+
+} // namespace JSC