1 files changed, 87 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/Symbol.h b/Source/JavaScriptCore/runtime/Symbol.h
new file mode 100644
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--- /dev/null
+++ b/Source/JavaScriptCore/runtime/Symbol.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ * Copyright (C) 2014 Apple Inc. All rights reserved.
+ * Copyright (C) 2015-2016 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.
+ */
+
+#pragma once
+
+#include "JSString.h"
+#include "PrivateName.h"
+
+namespace JSC {
+
+class Symbol final : public JSCell {
+public:
+    typedef JSCell Base;
+    static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal | OverridesToThis;
+
+    DECLARE_EXPORT_INFO;
+
+    static const bool needsDestruction = true;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(SymbolType, StructureFlags), info());
+    }
+
+    static Symbol* create(VM&);
+    static Symbol* create(ExecState*, JSString* description);
+    JS_EXPORT_PRIVATE static Symbol* create(VM&, SymbolImpl& uid);
+
+    const PrivateName& privateName() const { return m_privateName; }
+    String descriptiveString() const;
+
+    JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;
+    bool getPrimitiveNumber(ExecState*, double& number, JSValue&) const;
+    JSObject* toObject(ExecState*, JSGlobalObject*) const;
+    double toNumber(ExecState*) const;
+
+    static ptrdiff_t offsetOfSymbolImpl()
+    {
+        // PrivateName is just a Ref<SymbolImpl> which can just be used as a SymbolImpl*.
+        return OBJECT_OFFSETOF(Symbol, m_privateName);
+    }
+
+protected:
+    static void destroy(JSCell*);
+
+    Symbol(VM&);
+    Symbol(VM&, const String&);
+    Symbol(VM&, SymbolImpl& uid);
+
+    void finishCreation(VM&);
+
+    PrivateName m_privateName;
+};
+
+Symbol* asSymbol(JSValue);
+
+inline Symbol* asSymbol(JSValue value)
+{
+    ASSERT(value.asCell()->isSymbol());
+    return jsCast<Symbol*>(value.asCell());
+}
+
+} // namespace JSC