Attributes and deletion of String object properties

As per ECMA-262.

4 files changed, 29 insertions, 0 deletions

diff --git a/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.cpp b/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.cpp
index 86f95e0..e1fc66d 100644
--- a/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.cpp
+++ b/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.cpp
@@ -112,6 +112,21 @@ bool JSString::getOwnPropertySlot(ExecState* exec, unsigned propertyName, Proper
     return JSString::getOwnPropertySlot(exec, Identifier::from(exec, propertyName), slot);
 }
 
+bool JSString::getStringPropertyAttributes(ExecState* exec, const Identifier& propertyName, unsigned& attributes) const
+{
+    if (propertyName == exec->propertyNames().length) {
+        attributes = DontEnum | DontDelete | ReadOnly;
+        return true;
+    }
+    bool isStrictUInt32;
+    unsigned i = propertyName.toStrictUInt32(&isStrictUInt32);
+    if (isStrictUInt32 && i < static_cast<unsigned>(m_value.size())) {
+        attributes = DontDelete | ReadOnly;
+        return true;
+    }
+    return false;
+}
+
 JSString* jsString(JSGlobalData* globalData, const UString& s)
 {
     int size = s.size();
diff --git a/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.h b/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.h
index 900c565..6db9322 100644
--- a/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.h
+++ b/src/3rdparty/webkit/JavaScriptCore/runtime/JSString.h
@@ -87,6 +87,8 @@ namespace JSC {
         bool getStringPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
         bool getStringPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
 
+        bool getStringPropertyAttributes(ExecState*, const Identifier& propertyName, unsigned&) const;
+
         bool canGetIndex(unsigned i) { return i < static_cast<unsigned>(m_value.size()); }
         JSString* getIndex(JSGlobalData*, unsigned);
 
diff --git a/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.cpp b/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.cpp
index fb44498..df40691 100644
--- a/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.cpp
+++ b/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.cpp
@@ -72,6 +72,10 @@ bool StringObject::deleteProperty(ExecState* exec, const Identifier& propertyNam
 {
     if (propertyName == exec->propertyNames().length)
         return false;
+    bool isStrictUInt32;
+    unsigned i = propertyName.toStrictUInt32(&isStrictUInt32);
+    if (isStrictUInt32 && internalValue()->canGetIndex(i))
+        return false;
     return JSObject::deleteProperty(exec, propertyName);
 }
 
@@ -83,6 +87,13 @@ void StringObject::getPropertyNames(ExecState* exec, PropertyNameArray& property
     return JSObject::getPropertyNames(exec, propertyNames);
 }
 
+bool StringObject::getPropertyAttributes(ExecState* exec, const Identifier& propertyName, unsigned& attributes) const
+{
+    if (internalValue()->getStringPropertyAttributes(exec, propertyName, attributes))
+        return true;
+    return JSObject::getPropertyAttributes(exec, propertyName, attributes);
+}
+
 UString StringObject::toString(ExecState*) const
 {
     return internalValue()->value();
diff --git a/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.h b/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.h
index ea3a045..0b643a6 100644
--- a/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.h
+++ b/src/3rdparty/webkit/JavaScriptCore/runtime/StringObject.h
@@ -39,6 +39,7 @@ namespace JSC {
         virtual void put(ExecState* exec, const Identifier& propertyName, JSValue, PutPropertySlot&);
         virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
         virtual void getPropertyNames(ExecState*, PropertyNameArray&);
+        virtual bool getPropertyAttributes(ExecState*, const Identifier& propertyName, unsigned& attributes) const;
 
         virtual const ClassInfo* classInfo() const { return &info; }
         static const JS_EXPORTDATA ClassInfo info;