JavaScriptCore-7601.1.46.3.tar.gz

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

diff --git a/runtime/JSCallee.h b/runtime/JSCallee.h
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+/*
+ * Copyright (C) 2014 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 JSCallee_h
+#define JSCallee_h
+
+#include "JSGlobalObject.h"
+#include "JSObject.h"
+#include "JSScope.h"
+
+namespace JSC {
+
+class JSGlobalObject;
+class LLIntOffsetsExtractor;
+
+
+class JSCallee : public JSNonFinalObject {
+    friend class JIT;
+#if ENABLE(DFG_JIT)
+    friend class DFG::SpeculativeJIT;
+    friend class DFG::JITCompiler;
+#endif
+    friend class VM;
+
+public:
+    typedef JSNonFinalObject Base;
+    const static unsigned StructureFlags = Base::StructureFlags | ImplementsHasInstance;
+
+    static JSCallee* create(VM& vm, JSGlobalObject* globalObject, JSScope* scope)
+    {
+        JSCallee* callee = new (NotNull, allocateCell<JSCallee>(vm.heap)) JSCallee(vm, scope, globalObject->calleeStructure());
+        callee->finishCreation(vm);
+        return callee;
+    }
+    
+    JSScope* scope()
+    {
+        return m_scope.get();
+    }
+
+    // This method may be called for host functions, in which case it
+    // will return an arbitrary value. This should only be used for
+    // optimized paths in which the return value does not matter for
+    // host functions, and checking whether the function is a host
+    // function is deemed too expensive.
+    JSScope* scopeUnchecked()
+    {
+        return m_scope.get();
+    }
+
+    void setScope(VM& vm, JSScope* scope)
+    {
+        m_scope.set(vm, this, scope);
+    }
+
+    DECLARE_EXPORT_INFO;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype) 
+    {
+        ASSERT(globalObject);
+        return Structure::create(vm, globalObject, prototype, TypeInfo(JSCalleeType, StructureFlags), info());
+    }
+
+    static inline ptrdiff_t offsetOfScopeChain()
+    {
+        return OBJECT_OFFSETOF(JSCallee, m_scope);
+    }
+
+protected:
+    JS_EXPORT_PRIVATE JSCallee(VM&, JSGlobalObject*, Structure*);
+    JSCallee(VM&, JSScope*, Structure*);
+
+    void finishCreation(VM&);
+    using Base::finishCreation;
+
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+private:
+    friend class LLIntOffsetsExtractor;
+
+    WriteBarrier<JSScope> m_scope;
+};
+
+} // namespace JSC
+
+#endif // JSCallee_h