JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / JSONObject.cpp

diff --git a/runtime/JSONObject.cpp b/runtime/JSONObject.cpp
index 91b412ec3bd8da4d767b94fa0072fa89183b8efc..61dc046b0d2b91decae7b8798f205702ddd52f5b 100644 (file)
--- a/runtime/JSONObject.cpp
+++ b/runtime/JSONObject.cpp
@@ -36,17 +36,17 @@
 #include "LocalScope.h"
 #include "Lookup.h"
 #include "ObjectConstructor.h"
 #include "LocalScope.h"
 #include "Lookup.h"
 #include "ObjectConstructor.h"

-#include "Operations.h"
+#include "JSCInlines.h"

 #include "PropertyNameArray.h"
 #include <wtf/MathExtras.h>
 #include <wtf/text/StringBuilder.h>
 
 namespace JSC {
 
 #include "PropertyNameArray.h"
 #include <wtf/MathExtras.h>
 #include <wtf/text/StringBuilder.h>
 
 namespace JSC {
 

-ASSERT_HAS_TRIVIAL_DESTRUCTOR(JSONObject);
+STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSONObject);

 
 

-static EncodedJSValue JSC_HOST_CALL JSONProtoFuncParse(ExecState*);
-static EncodedJSValue JSC_HOST_CALL JSONProtoFuncStringify(ExecState*);
+EncodedJSValue JSC_HOST_CALL JSONProtoFuncParse(ExecState*);
+EncodedJSValue JSC_HOST_CALL JSONProtoFuncStringify(ExecState*);

 
 }
 
 
 }
 


@@ -54,15 +54,15 @@ static EncodedJSValue JSC_HOST_CALL JSONProtoFuncStringify(ExecState*);
 
 namespace JSC {
 
 
 namespace JSC {
 

-JSONObject::JSONObject(JSGlobalObject* globalObject, Structure* structure)
-    : JSNonFinalObject(globalObject->vm(), structure)
+JSONObject::JSONObject(VM& vm, Structure* structure)
+    : JSNonFinalObject(vm, structure)

 {
 }
 
 {
 }
 

-void JSONObject::finishCreation(JSGlobalObject* globalObject)
+void JSONObject::finishCreation(VM& vm)

 {
 {

-    Base::finishCreation(globalObject->vm());
-    ASSERT(inherits(&s_info));
+    Base::finishCreation(vm);
+    ASSERT(inherits(info()));

 }
 
 // PropertyNameForFunctionCall objects must be on the stack, since the JSValue that they create is not marked.
 }
 
 // PropertyNameForFunctionCall objects must be on the stack, since the JSValue that they create is not marked.


@@ -107,8 +107,6 @@ private:
 
     friend class Holder;
 
 
     friend class Holder;
 

-    static void appendQuotedString(StringBuilder&, const String&);
-

     JSValue toJSON(JSValue, const PropertyNameForFunctionCall&);
 
     enum StringifyResult { StringifyFailed, StringifySucceeded, StringifyFailedDueToUndefinedValue };
     JSValue toJSON(JSValue, const PropertyNameForFunctionCall&);
 
     enum StringifyResult { StringifyFailed, StringifySucceeded, StringifyFailedDueToUndefinedValue };


@@ -139,11 +137,11 @@ static inline JSValue unwrapBoxedPrimitive(ExecState* exec, JSValue value)
     if (!value.isObject())
         return value;
     JSObject* object = asObject(value);
     if (!value.isObject())
         return value;
     JSObject* object = asObject(value);

-    if (object->inherits(&NumberObject::s_info))
+    if (object->inherits(NumberObject::info()))

         return jsNumber(object->toNumber(exec));
         return jsNumber(object->toNumber(exec));

-    if (object->inherits(&StringObject::s_info))
+    if (object->inherits(StringObject::info()))

         return object->toString(exec);
         return object->toString(exec);

-    if (object->inherits(&BooleanObject::s_info))
+    if (object->inherits(BooleanObject::info()))

         return object->toPrimitive(exec);
     return value;
 }
         return object->toPrimitive(exec);
     return value;
 }


@@ -214,7 +212,7 @@ Stringifier::Stringifier(ExecState* exec, const Local<Unknown>& replacer, const
     if (!m_replacer.isObject())
         return;
 
     if (!m_replacer.isObject())
         return;
 

-    if (m_replacer.asObject()->inherits(&JSArray::s_info)) {
+    if (m_replacer.asObject()->inherits(JSArray::info())) {

         m_usingArrayReplacer = true;
         Handle<JSObject> array = m_replacer.asObject();
         unsigned length = array->get(exec, exec->vm().propertyNames->length).toUInt32(exec);
         m_usingArrayReplacer = true;
         Handle<JSObject> array = m_replacer.asObject();
         unsigned length = array->get(exec, exec->vm().propertyNames->length).toUInt32(exec);


@@ -224,11 +222,12 @@ Stringifier::Stringifier(ExecState* exec, const Local<Unknown>& replacer, const
                 break;
 
             if (name.isObject()) {
                 break;
 
             if (name.isObject()) {

-                if (!asObject(name)->inherits(&NumberObject::s_info) && !asObject(name)->inherits(&StringObject::s_info))
+                if (!asObject(name)->inherits(NumberObject::info()) && !asObject(name)->inherits(StringObject::info()))

                     continue;
                     continue;

-            }
+            } else if (!name.isNumber() && !name.isString())
+                continue;

 
 

-            m_arrayReplacerPropertyNames.add(Identifier(exec, name.toString(exec)->value(exec)));
+            m_arrayReplacerPropertyNames.add(name.toString(exec)->toIdentifier(exec));

         }
         return;
     }
         }
         return;
     }


@@ -254,69 +253,6 @@ Local<Unknown> Stringifier::stringify(Handle<Unknown> value)
     return Local<Unknown>(m_exec->vm(), jsString(m_exec, result.toString()));
 }
 
     return Local<Unknown>(m_exec->vm(), jsString(m_exec, result.toString()));
 }
 

-template <typename CharType>
-static void appendStringToStringBuilder(StringBuilder& builder, const CharType* data, int length)
-{
-    for (int i = 0; i < length; ++i) {
-        int start = i;
-        while (i < length && (data[i] > 0x1F && data[i] != '"' && data[i] != '\\'))
-            ++i;
-        builder.append(data + start, i - start);
-        if (i >= length)
-            break;
-        switch (data[i]) {
-        case '\t':
-            builder.append('\\');
-            builder.append('t');
-            break;
-        case '\r':
-            builder.append('\\');
-            builder.append('r');
-            break;
-        case '\n':
-            builder.append('\\');
-            builder.append('n');
-            break;
-        case '\f':
-            builder.append('\\');
-            builder.append('f');
-            break;
-        case '\b':
-            builder.append('\\');
-            builder.append('b');
-            break;
-        case '"':
-            builder.append('\\');
-            builder.append('"');
-            break;
-        case '\\':
-            builder.append('\\');
-            builder.append('\\');
-            break;
-        default:
-            static const char hexDigits[] = "0123456789abcdef";
-            UChar ch = data[i];
-            LChar hex[] = { '\\', 'u', static_cast<LChar>(hexDigits[(ch >> 12) & 0xF]), static_cast<LChar>(hexDigits[(ch >> 8) & 0xF]), static_cast<LChar>(hexDigits[(ch >> 4) & 0xF]), static_cast<LChar>(hexDigits[ch & 0xF]) };
-            builder.append(hex, WTF_ARRAY_LENGTH(hex));
-            break;
-        }
-    }
-}
-    
-void Stringifier::appendQuotedString(StringBuilder& builder, const String& value)
-{
-    int length = value.length();
-
-    builder.append('"');
-
-    if (value.is8Bit())
-        appendStringToStringBuilder<LChar>(builder, value.characters8(), length);
-    else
-        appendStringToStringBuilder<UChar>(builder, value.characters16(), length);
-
-    builder.append('"');
-}
-

 inline JSValue Stringifier::toJSON(JSValue value, const PropertyNameForFunctionCall& propertyName)
 {
     ASSERT(!m_exec->hadException());
 inline JSValue Stringifier::toJSON(JSValue value, const PropertyNameForFunctionCall& propertyName)
 {
     ASSERT(!m_exec->hadException());


@@ -358,7 +294,7 @@ Stringifier::StringifyResult Stringifier::appendStringifiedValue(StringBuilder&
             return StringifyFailed;
     }
 
             return StringifyFailed;
     }
 

-    if (value.isUndefined() && !holder->inherits(&JSArray::s_info))
+    if (value.isUndefined() && !holder->inherits(JSArray::info()))

         return StringifyFailedDueToUndefinedValue;
 
     if (value.isNull()) {
         return StringifyFailedDueToUndefinedValue;
 
     if (value.isNull()) {


@@ -379,18 +315,21 @@ Stringifier::StringifyResult Stringifier::appendStringifiedValue(StringBuilder&
         return StringifySucceeded;
     }
 
         return StringifySucceeded;
     }
 

-    String stringValue;
-    if (value.getString(m_exec, stringValue)) {
-        appendQuotedString(builder, stringValue);
+    if (value.isString()) {
+        builder.appendQuotedJSONString(asString(value)->value(m_exec));

         return StringifySucceeded;
     }
 
     if (value.isNumber()) {
         return StringifySucceeded;
     }
 
     if (value.isNumber()) {

-        double number = value.asNumber();
-        if (!std::isfinite(number))
-            builder.appendLiteral("null");
-        else
-            builder.append(String::numberToStringECMAScript(number));
+        if (value.isInt32())
+            builder.appendNumber(value.asInt32());
+        else {
+            double number = value.asNumber();
+            if (!std::isfinite(number))
+                builder.appendLiteral("null");
+            else
+                builder.appendECMAScriptNumber(number);
+        }

         return StringifySucceeded;
     }
 
         return StringifySucceeded;
     }
 


@@ -401,7 +340,7 @@ Stringifier::StringifyResult Stringifier::appendStringifiedValue(StringBuilder&
 
     CallData callData;
     if (object->methodTable()->getCallData(object, callData) != CallTypeNone) {
 
     CallData callData;
     if (object->methodTable()->getCallData(object, callData) != CallTypeNone) {

-        if (holder->inherits(&JSArray::s_info)) {
+        if (holder->inherits(JSArray::info())) {

             builder.appendLiteral("null");
             return StringifySucceeded;
         }
             builder.appendLiteral("null");
             return StringifySucceeded;
         }


@@ -411,7 +350,7 @@ Stringifier::StringifyResult Stringifier::appendStringifiedValue(StringBuilder&
     // Handle cycle detection, and put the holder on the stack.
     for (unsigned i = 0; i < m_holderStack.size(); i++) {
         if (m_holderStack[i].object() == object) {
     // Handle cycle detection, and put the holder on the stack.
     for (unsigned i = 0; i < m_holderStack.size(); i++) {
         if (m_holderStack[i].object() == object) {

-            throwError(m_exec, createTypeError(m_exec, ASCIILiteral("JSON.stringify cannot serialize cyclic structures.")));
+            m_exec->vm().throwException(m_exec, createTypeError(m_exec, ASCIILiteral("JSON.stringify cannot serialize cyclic structures.")));

             return StringifyFailed;
         }
     }
             return StringifyFailed;
         }
     }


@@ -461,7 +400,7 @@ inline void Stringifier::startNewLine(StringBuilder& builder) const
 
 inline Stringifier::Holder::Holder(VM& vm, JSObject* object)
     : m_object(vm, object)
 
 inline Stringifier::Holder::Holder(VM& vm, JSObject* object)
     : m_object(vm, object)

-    , m_isArray(object->inherits(&JSArray::s_info))
+    , m_isArray(object->inherits(JSArray::info()))

     , m_index(0)
 #ifndef NDEBUG
     , m_size(0)
     , m_index(0)
 #ifndef NDEBUG
     , m_size(0)


@@ -479,14 +418,17 @@ bool Stringifier::Holder::appendNextProperty(Stringifier& stringifier, StringBui
     if (!m_index) {
         if (m_isArray) {
             m_isJSArray = isJSArray(m_object.get());
     if (!m_index) {
         if (m_isArray) {
             m_isJSArray = isJSArray(m_object.get());

-            m_size = m_object->get(exec, exec->vm().propertyNames->length).toUInt32(exec);
+            if (m_isJSArray)
+                m_size = asArray(m_object.get())->length();
+            else
+                m_size = m_object->get(exec, exec->vm().propertyNames->length).toUInt32(exec);

             builder.append('[');
         } else {
             if (stringifier.m_usingArrayReplacer)
                 m_propertyNames = stringifier.m_arrayReplacerPropertyNames.data();
             else {
                 PropertyNameArray objectPropertyNames(exec);
             builder.append('[');
         } else {
             if (stringifier.m_usingArrayReplacer)
                 m_propertyNames = stringifier.m_arrayReplacerPropertyNames.data();
             else {
                 PropertyNameArray objectPropertyNames(exec);

-                m_object->methodTable()->getOwnPropertyNames(m_object.get(), exec, objectPropertyNames, ExcludeDontEnumProperties);
+                m_object->methodTable()->getOwnPropertyNames(m_object.get(), exec, objectPropertyNames, EnumerationMode());

                 m_propertyNames = objectPropertyNames.releaseData();
             }
             m_size = m_propertyNames->propertyNameVector().size();
                 m_propertyNames = objectPropertyNames.releaseData();
             }
             m_size = m_propertyNames->propertyNameVector().size();


@@ -515,11 +457,12 @@ bool Stringifier::Holder::appendNextProperty(Stringifier& stringifier, StringBui
             value = asArray(m_object.get())->getIndexQuickly(index);
         else {
             PropertySlot slot(m_object.get());
             value = asArray(m_object.get())->getIndexQuickly(index);
         else {
             PropertySlot slot(m_object.get());

-            if (!m_object->methodTable()->getOwnPropertySlotByIndex(m_object.get(), exec, index, slot))
-                slot.setUndefined();
-            if (exec->hadException())
-                return false;
-            value = slot.getValue(exec, index);
+            if (m_object->methodTable()->getOwnPropertySlotByIndex(m_object.get(), exec, index, slot)) {
+                value = slot.getValue(exec, index);
+                if (exec->hadException())
+                    return false;
+            } else
+                value = jsUndefined();

         }
 
         // Append the separator string.
         }
 
         // Append the separator string.


@@ -547,7 +490,7 @@ bool Stringifier::Holder::appendNextProperty(Stringifier& stringifier, StringBui
         stringifier.startNewLine(builder);
 
         // Append the property name.
         stringifier.startNewLine(builder);
 
         // Append the property name.

-        appendQuotedString(builder, propertyName.string());
+        builder.appendQuotedJSONString(propertyName.string());

         builder.append(':');
         if (stringifier.willIndent())
             builder.append(' ');
         builder.append(':');
         if (stringifier.willIndent())
             builder.append(' ');


@@ -579,7 +522,7 @@ bool Stringifier::Holder::appendNextProperty(Stringifier& stringifier, StringBui
 
 // ------------------------------ JSONObject --------------------------------
 
 
 // ------------------------------ JSONObject --------------------------------
 

-const ClassInfo JSONObject::s_info = { "JSON", &JSNonFinalObject::s_info, 0, ExecState::jsonTable, CREATE_METHOD_TABLE(JSONObject) };
+const ClassInfo JSONObject::s_info = { "JSON", &JSNonFinalObject::s_info, &jsonTable, CREATE_METHOD_TABLE(JSONObject) };

 
 /* Source for JSONObject.lut.h
 @begin jsonTable
 
 /* Source for JSONObject.lut.h
 @begin jsonTable


@@ -590,14 +533,9 @@ const ClassInfo JSONObject::s_info = { "JSON", &JSNonFinalObject::s_info, 0, Exe
 
 // ECMA 15.8
 
 
 // ECMA 15.8
 

-bool JSONObject::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
-{
-    return getStaticFunctionSlot<JSObject>(exec, ExecState::jsonTable(exec), jsCast<JSONObject*>(cell), propertyName, slot);
-}
-
-bool JSONObject::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
+bool JSONObject::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)

 {
 {

-    return getStaticFunctionDescriptor<JSObject>(exec, ExecState::jsonTable(exec), jsCast<JSONObject*>(object), propertyName, descriptor);
+    return getStaticFunctionSlot<JSObject>(exec, jsonTable, jsCast<JSONObject*>(object), propertyName, slot);

 }
 
 class Walker {
 }
 
 class Walker {


@@ -648,16 +586,16 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
             arrayStartState:
             case ArrayStartState: {
                 ASSERT(inValue.isObject());
             arrayStartState:
             case ArrayStartState: {
                 ASSERT(inValue.isObject());

-                ASSERT(isJSArray(asObject(inValue)) || asObject(inValue)->inherits(&JSArray::s_info));
+                ASSERT(isJSArray(asObject(inValue)) || asObject(inValue)->inherits(JSArray::info()));

                 if (objectStack.size() + arrayStack.size() > maximumFilterRecursion)
                 if (objectStack.size() + arrayStack.size() > maximumFilterRecursion)

-                    return throwError(m_exec, createStackOverflowError(m_exec));
+                    return throwStackOverflowError(m_exec);

 
                 JSArray* array = asArray(inValue);
                 arrayStack.push(array);
                 indexStack.append(0);
 
                 JSArray* array = asArray(inValue);
                 arrayStack.push(array);
                 indexStack.append(0);

-                // fallthrough

             }
             arrayStartVisitMember:
             }
             arrayStartVisitMember:

+            FALLTHROUGH;

             case ArrayStartVisitMember: {
                 JSArray* array = arrayStack.peek();
                 uint32_t index = indexStack.last();
             case ArrayStartVisitMember: {
                 JSArray* array = arrayStack.peek();
                 uint32_t index = indexStack.last();


@@ -670,7 +608,7 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
                 if (isJSArray(array) && array->canGetIndexQuickly(index))
                     inValue = array->getIndexQuickly(index);
                 else {
                 if (isJSArray(array) && array->canGetIndexQuickly(index))
                     inValue = array->getIndexQuickly(index);
                 else {

-                    PropertySlot slot;
+                    PropertySlot slot(array);

                     if (array->methodTable()->getOwnPropertySlotByIndex(array, m_exec, index, slot))
                         inValue = slot.getValue(m_exec, index);
                     else
                     if (array->methodTable()->getOwnPropertySlotByIndex(array, m_exec, index, slot))
                         inValue = slot.getValue(m_exec, index);
                     else


@@ -682,7 +620,7 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
                     goto stateUnknown;
                 } else
                     outValue = inValue;
                     goto stateUnknown;
                 } else
                     outValue = inValue;

-                // fallthrough
+                FALLTHROUGH;

             }
             case ArrayEndVisitMember: {
                 JSArray* array = arrayStack.peek();
             }
             case ArrayEndVisitMember: {
                 JSArray* array = arrayStack.peek();


@@ -699,18 +637,18 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
             objectStartState:
             case ObjectStartState: {
                 ASSERT(inValue.isObject());
             objectStartState:
             case ObjectStartState: {
                 ASSERT(inValue.isObject());

-                ASSERT(!isJSArray(asObject(inValue)) && !asObject(inValue)->inherits(&JSArray::s_info));
+                ASSERT(!isJSArray(asObject(inValue)) && !asObject(inValue)->inherits(JSArray::info()));

                 if (objectStack.size() + arrayStack.size() > maximumFilterRecursion)
                 if (objectStack.size() + arrayStack.size() > maximumFilterRecursion)

-                    return throwError(m_exec, createStackOverflowError(m_exec));
+                    return throwStackOverflowError(m_exec);

 
                 JSObject* object = asObject(inValue);
                 objectStack.push(object);
                 indexStack.append(0);
                 propertyStack.append(PropertyNameArray(m_exec));
 
                 JSObject* object = asObject(inValue);
                 objectStack.push(object);
                 indexStack.append(0);
                 propertyStack.append(PropertyNameArray(m_exec));

-                object->methodTable()->getOwnPropertyNames(object, m_exec, propertyStack.last(), ExcludeDontEnumProperties);
-                // fallthrough
+                object->methodTable()->getOwnPropertyNames(object, m_exec, propertyStack.last(), EnumerationMode());

             }
             objectStartVisitMember:
             }
             objectStartVisitMember:

+            FALLTHROUGH;

             case ObjectStartVisitMember: {
                 JSObject* object = objectStack.peek();
                 uint32_t index = indexStack.last();
             case ObjectStartVisitMember: {
                 JSObject* object = objectStack.peek();
                 uint32_t index = indexStack.last();


@@ -722,7 +660,7 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
                     propertyStack.removeLast();
                     break;
                 }
                     propertyStack.removeLast();
                     break;
                 }

-                PropertySlot slot;
+                PropertySlot slot(object);

                 if (object->methodTable()->getOwnPropertySlot(object, m_exec, properties[index], slot))
                     inValue = slot.getValue(m_exec, properties[index]);
                 else
                 if (object->methodTable()->getOwnPropertySlot(object, m_exec, properties[index], slot))
                     inValue = slot.getValue(m_exec, properties[index]);
                 else


@@ -737,12 +675,12 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
                     goto stateUnknown;
                 } else
                     outValue = inValue;
                     goto stateUnknown;
                 } else
                     outValue = inValue;

-                // fallthrough
+                FALLTHROUGH;

             }
             case ObjectEndVisitMember: {
                 JSObject* object = objectStack.peek();
                 Identifier prop = propertyStack.last()[indexStack.last()];
             }
             case ObjectEndVisitMember: {
                 JSObject* object = objectStack.peek();
                 Identifier prop = propertyStack.last()[indexStack.last()];

-                PutPropertySlot slot;
+                PutPropertySlot slot(object);

                 JSValue filteredValue = callReviver(object, jsString(m_exec, prop.string()), outValue);
                 if (filteredValue.isUndefined())
                     object->methodTable()->deleteProperty(object, m_exec, prop);
                 JSValue filteredValue = callReviver(object, jsString(m_exec, prop.string()), outValue);
                 if (filteredValue.isUndefined())
                     object->methodTable()->deleteProperty(object, m_exec, prop);


@@ -760,7 +698,7 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
                     break;
                 }
                 JSObject* object = asObject(inValue);
                     break;
                 }
                 JSObject* object = asObject(inValue);

-                if (isJSArray(object) || object->inherits(&JSArray::s_info))
+                if (isJSArray(object) || object->inherits(JSArray::info()))

                     goto arrayStartState;
                 goto objectStartState;
         }
                     goto arrayStartState;
                 goto objectStartState;
         }


@@ -771,7 +709,7 @@ NEVER_INLINE JSValue Walker::walk(JSValue unfiltered)
         stateStack.removeLast();
     }
     JSObject* finalHolder = constructEmptyObject(m_exec);
         stateStack.removeLast();
     }
     JSObject* finalHolder = constructEmptyObject(m_exec);

-    PutPropertySlot slot;
+    PutPropertySlot slot(finalHolder);

     finalHolder->methodTable()->put(finalHolder, m_exec, m_exec->vm().propertyNames->emptyIdentifier, outValue, slot);
     return callReviver(finalHolder, jsEmptyString(m_exec), outValue);
 }
     finalHolder->methodTable()->put(finalHolder, m_exec, m_exec->vm().propertyNames->emptyIdentifier, outValue, slot);
     return callReviver(finalHolder, jsEmptyString(m_exec), outValue);
 }


@@ -781,7 +719,7 @@ EncodedJSValue JSC_HOST_CALL JSONProtoFuncParse(ExecState* exec)
 {
     if (!exec->argumentCount())
         return throwVMError(exec, createError(exec, ASCIILiteral("JSON.parse requires at least one parameter")));
 {
     if (!exec->argumentCount())
         return throwVMError(exec, createError(exec, ASCIILiteral("JSON.parse requires at least one parameter")));

-    String source = exec->argument(0).toString(exec)->value(exec);
+    StringView source = exec->uncheckedArgument(0).toString(exec)->view(exec);

     if (exec->hadException())
         return JSValue::encode(jsNull());
 
     if (exec->hadException())
         return JSValue::encode(jsNull());
 


@@ -802,7 +740,7 @@ EncodedJSValue JSC_HOST_CALL JSONProtoFuncParse(ExecState* exec)
     if (exec->argumentCount() < 2)
         return JSValue::encode(unfiltered);
     
     if (exec->argumentCount() < 2)
         return JSValue::encode(unfiltered);
     

-    JSValue function = exec->argument(1);
+    JSValue function = exec->uncheckedArgument(1);

     CallData callData;
     CallType callType = getCallData(function, callData);
     if (callType == CallTypeNone)
     CallData callData;
     CallType callType = getCallData(function, callData);
     if (callType == CallTypeNone)


@@ -816,10 +754,24 @@ EncodedJSValue JSC_HOST_CALL JSONProtoFuncStringify(ExecState* exec)
     if (!exec->argumentCount())
         return throwVMError(exec, createError(exec, ASCIILiteral("No input to stringify")));
     LocalScope scope(exec->vm());
     if (!exec->argumentCount())
         return throwVMError(exec, createError(exec, ASCIILiteral("No input to stringify")));
     LocalScope scope(exec->vm());

-    Local<Unknown> value(exec->vm(), exec->argument(0));
+    Local<Unknown> value(exec->vm(), exec->uncheckedArgument(0));

     Local<Unknown> replacer(exec->vm(), exec->argument(1));
     Local<Unknown> space(exec->vm(), exec->argument(2));
     Local<Unknown> replacer(exec->vm(), exec->argument(1));
     Local<Unknown> space(exec->vm(), exec->argument(2));

-    return JSValue::encode(Stringifier(exec, replacer, space).stringify(value).get());
+    JSValue result = Stringifier(exec, replacer, space).stringify(value).get();
+    return JSValue::encode(result);
+}
+
+JSValue JSONParse(ExecState* exec, const String& json)
+{
+    LocalScope scope(exec->vm());
+
+    if (json.is8Bit()) {
+        LiteralParser<LChar> jsonParser(exec, json.characters8(), json.length(), StrictJSON);
+        return jsonParser.tryLiteralParse();
+    }
+
+    LiteralParser<UChar> jsonParser(exec, json.characters16(), json.length(), StrictJSON);
+    return jsonParser.tryLiteralParse();

 }
 
 String JSONStringify(ExecState* exec, JSValue value, unsigned indent)
 }
 
 String JSONStringify(ExecState* exec, JSValue value, unsigned indent)