JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / runtime / JSNameScope.h

diff --git a/runtime/JSNameScope.h b/runtime/JSNameScope.h
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+/*
+ * Copyright (C) 2008, 2009 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. 
+ */
+
+#ifndef JSNameScope_h
+#define JSNameScope_h
+
+#include "JSGlobalObject.h"
+#include "JSVariableObject.h"
+
+namespace JSC {
+
+// Used for scopes with a single named variable: catch and named function expression.
+class JSNameScope : public JSVariableObject {
+public:
+    typedef JSVariableObject Base;
+
+    static JSNameScope* create(ExecState* exec, const Identifier& identifier, JSValue value, unsigned attributes)
+    {
+        JSNameScope* scopeObject = new (NotNull, allocateCell<JSNameScope>(*exec->heap())) JSNameScope(exec, exec->scope());
+        scopeObject->finishCreation(exec, identifier, value, attributes);
+        return scopeObject;
+    }
+
+    static JSNameScope* create(ExecState* exec, const Identifier& identifier, JSValue value, unsigned attributes, JSScope* next)
+    {
+        JSNameScope* scopeObject = new (NotNull, allocateCell<JSNameScope>(*exec->heap())) JSNameScope(exec, next);
+        scopeObject->finishCreation(exec, identifier, value, attributes);
+        return scopeObject;
+    }
+
+    static void visitChildren(JSCell*, SlotVisitor&);
+    bool isDynamicScope(bool& requiresDynamicChecks) const;
+    static JSObject* toThisObject(JSCell*, ExecState*);
+    static bool getOwnPropertySlot(JSCell*, ExecState*, PropertyName, PropertySlot&);
+    static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(vm, globalObject, proto, TypeInfo(NameScopeObjectType, StructureFlags), &s_info); }
+
+    static const ClassInfo s_info;
+
+protected:
+    void finishCreation(ExecState* exec, const Identifier& identifier, JSValue value, unsigned attributes)
+    {
+        Base::finishCreation(exec->vm());
+        m_registerStore.set(exec->vm(), this, value);
+        symbolTable()->add(identifier.impl(), SymbolTableEntry(-1, attributes));
+    }
+
+    static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesVisitChildren | Base::StructureFlags;
+
+private:
+    JSNameScope(ExecState* exec, JSScope* next)
+        : Base(
+            exec->vm(),
+            exec->lexicalGlobalObject()->nameScopeStructure(),
+            reinterpret_cast<Register*>(&m_registerStore + 1),
+            next
+        )
+    {
+    }
+
+    WriteBarrier<Unknown> m_registerStore;
+};
+
+inline bool JSNameScope::isDynamicScope(bool&) const
+{
+    return false;
+}
+
+}
+
+#endif // JSNameScope_h