JavaScriptCore-7600.1.4.9.tar.gz

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

diff --git a/runtime/StructureChain.h b/runtime/StructureChain.h
index c48749d29be302f6733162ec4c972b2c4e5340b7..26bda4dfd59708acc85609dd23066ed1bc8923c7 100644 (file)
--- a/runtime/StructureChain.h
+++ b/runtime/StructureChain.h
@@ -10,10 +10,10 @@
  *    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 COMPUTER, INC. ``AS IS'' AND ANY
+ * 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 COMPUTER, INC. OR
+ * 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
@@ -26,25 +26,68 @@
 #ifndef StructureChain_h
 #define StructureChain_h
 
-#include <wtf/OwnArrayPtr.h>
+#include "JSCell.h"
+#include "JSObject.h"
+#include "Structure.h"
+
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
 #include <wtf/RefPtr.h>
+#include <wtf/StdLibExtras.h>
 
 namespace JSC {
 
+    class LLIntOffsetsExtractor;
     class Structure;
 
-    class StructureChain : public RefCounted<StructureChain> {
+    class StructureChain : public JSCell {
+        friend class JIT;
+
     public:
-        static PassRefPtr<StructureChain> create(Structure* head) { return adoptRef(new StructureChain(head)); }
-        RefPtr<Structure>* head() { return m_vector.get(); }
-        bool isCacheable() const;
+        typedef JSCell Base;
 
-    private:
-        StructureChain(Structure* head);
+        static StructureChain* create(VM& vm, Structure* head)
+        { 
+            StructureChain* chain = new (NotNull, allocateCell<StructureChain>(vm.heap)) StructureChain(vm, vm.structureChainStructure.get());
+            chain->finishCreation(vm, head);
+            return chain;
+        }
+        WriteBarrier<Structure>* head() { return m_vector.get(); }
+        static void visitChildren(JSCell*, SlotVisitor&);
+
+        static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+        {
+            return Structure::create(vm, globalObject, prototype, TypeInfo(CompoundType, StructureFlags), info());
+        }
+        
+        DECLARE_INFO;
+
+        static const bool needsDestruction = true;
+        static const bool hasImmortalStructure = true;
+        static void destroy(JSCell*);
 
-        OwnArrayPtr<RefPtr<Structure> > m_vector;
+    protected:
+        static const unsigned StructureFlags = OverridesVisitChildren | StructureIsImmortal;
+
+        void finishCreation(VM& vm, Structure* head)
+        {
+            Base::finishCreation(vm);
+            size_t size = 0;
+            for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
+                ++size;
+    
+            m_vector = std::make_unique<WriteBarrier<Structure>[]>(size + 1);
+
+            size_t i = 0;
+            for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
+                m_vector[i++].set(vm, this, current);
+        }
+
+    private:
+        friend class LLIntOffsetsExtractor;
+        
+        StructureChain(VM&, Structure*);
+        std::unique_ptr<WriteBarrier<Structure>[]> m_vector;
     };
 
 } // namespace JSC