JavaScriptCore-1218.34.tar.gz

[apple/javascriptcore.git] / API / JSClassRef.h

diff --git a/API/JSClassRef.h b/API/JSClassRef.h
index eb2b35b0190e0aaa7d658a4da45c7e7939c36ff4..7bf18e758c1296a97e8a60fd4c711e69a2e4f55f 100644 (file)
--- a/API/JSClassRef.h
+++ b/API/JSClassRef.h
@@ -1,4 +1,3 @@
-// -*- mode: c++; c-basic-offset: 4 -*-
 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  *
@@ -27,15 +26,16 @@
 #ifndef JSClassRef_h
 #define JSClassRef_h
 
-#include "JSObjectRef.h"
+#include <JavaScriptCore/JSObjectRef.h>
 
-#include <kjs/object.h>
-#include <kjs/protect.h>
-#include <kjs/ustring.h>
+#include "Weak.h"
+#include "Protect.h"
 #include <wtf/HashMap.h>
-#include <wtf/RefCounted.h>
+#include <wtf/text/WTFString.h>
 
 struct StaticValueEntry {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
     StaticValueEntry(JSObjectGetPropertyCallback _getProperty, JSObjectSetPropertyCallback _setProperty, JSPropertyAttributes _attributes)
         : getProperty(_getProperty), setProperty(_setProperty), attributes(_attributes)
     {
@@ -47,6 +47,8 @@ struct StaticValueEntry {
 };
 
 struct StaticFunctionEntry {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
     StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes)
         : callAsFunction(_callAsFunction), attributes(_attributes)
     {
@@ -56,22 +58,43 @@ struct StaticFunctionEntry {
     JSPropertyAttributes attributes;
 };
 
-struct OpaqueJSClass : public RefCounted<OpaqueJSClass> {
-    static OpaqueJSClass* create(const JSClassDefinition*);
-    static OpaqueJSClass* createNoAutomaticPrototype(const JSClassDefinition*);
-    ~OpaqueJSClass();
-    
-    KJS::JSObject* prototype(JSContextRef ctx);
+typedef HashMap<RefPtr<StringImpl>, OwnPtr<StaticValueEntry> > OpaqueJSClassStaticValuesTable;
+typedef HashMap<RefPtr<StringImpl>, OwnPtr<StaticFunctionEntry> > OpaqueJSClassStaticFunctionsTable;
+
+struct OpaqueJSClass;
+
+// An OpaqueJSClass (JSClass) is created without a context, so it can be used with any context, even across context groups.
+// This structure holds data members that vary across context groups.
+struct OpaqueJSClassContextData {
+    WTF_MAKE_NONCOPYABLE(OpaqueJSClassContextData); WTF_MAKE_FAST_ALLOCATED;
+public:
+    OpaqueJSClassContextData(JSC::VM&, OpaqueJSClass*);
+
+    // It is necessary to keep OpaqueJSClass alive because of the following rare scenario:
+    // 1. A class is created and used, so its context data is stored in VM hash map.
+    // 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass
+    // is deleted (that's the part prevented by this RefPtr).
+    // 3. Another class is created at the same address.
+    // 4. When it is used, the old context data is found in VM and used.
+    RefPtr<OpaqueJSClass> m_class;
+
+    OwnPtr<OpaqueJSClassStaticValuesTable> staticValues;
+    OwnPtr<OpaqueJSClassStaticFunctionsTable> staticFunctions;
+    JSC::Weak<JSC::JSObject> cachedPrototype;
+};
+
+struct OpaqueJSClass : public ThreadSafeRefCounted<OpaqueJSClass> {
+    static PassRefPtr<OpaqueJSClass> create(const JSClassDefinition*);
+    static PassRefPtr<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*);
+    JS_EXPORT_PRIVATE ~OpaqueJSClass();
     
-    typedef HashMap<RefPtr<KJS::UString::Rep>, StaticValueEntry*> StaticValuesTable;
-    typedef HashMap<RefPtr<KJS::UString::Rep>, StaticFunctionEntry*> StaticFunctionsTable;
+    String className();
+    OpaqueJSClassStaticValuesTable* staticValues(JSC::ExecState*);
+    OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::ExecState*);
+    JSC::JSObject* prototype(JSC::ExecState*);
 
-    KJS::UString className;
     OpaqueJSClass* parentClass;
     OpaqueJSClass* prototypeClass;
-
-    StaticValuesTable* staticValues;
-    StaticFunctionsTable* staticFunctions;
     
     JSObjectInitializeCallback initialize;
     JSObjectFinalizeCallback finalize;
@@ -86,12 +109,18 @@ struct OpaqueJSClass : public RefCounted<OpaqueJSClass> {
     JSObjectConvertToTypeCallback convertToType;
 
 private:
+    friend struct OpaqueJSClassContextData;
+
     OpaqueJSClass();
     OpaqueJSClass(const OpaqueJSClass&);
     OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass);
-    
-    friend void clearReferenceToPrototype(JSObjectRef prototype);
-    KJS::JSObject* cachedPrototype;
+
+    OpaqueJSClassContextData& contextData(JSC::ExecState*);
+
+    // Strings in these data members should not be put into any IdentifierTable.
+    String m_className;
+    OwnPtr<OpaqueJSClassStaticValuesTable> m_staticValues;
+    OwnPtr<OpaqueJSClassStaticFunctionsTable> m_staticFunctions;
 };
 
 #endif // JSClassRef_h