Attachment 349854 Details for Bug 189455 – One more try at fixing Windows, give EWS a chance

[patch] One more try at fixing Windows, give EWS a chance

bug-189455-20180915081629.patch (text/plain), 247.85 KB, created by Darin Adler on 2018-09-15 08:16:30 PDT

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Creator: Darin Adler

Created: 2018-09-15 08:16:30 PDT

Size: 247.85 KB

patch

obsolete

>Subversion Revision: 236031
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 66cb764ed3780097943070dadaae6d254ae2f43e..01901da1fc78c5cb219da42e66681dad16e5f575 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,73 @@
>+2018-09-08  Darin Adler  <darin@apple.com>
>+
>+        Streamline JSRetainPtr, fix leaks of JSString and JSGlobalContext
>+        https://bugs.webkit.org/show_bug.cgi?id=189455
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * API/JSObjectRef.cpp:
>+        (OpaqueJSPropertyNameArray): Use Ref<OpaqueJSString> instead of
>+        JSRetainPtr<JSStringRef>.
>+        (JSObjectCopyPropertyNames): Remove now-unneeded use of leakRef and
>+        adopt constructor.
>+        (JSPropertyNameArrayGetNameAtIndex): Use ptr() instead of get() since
>+        the array elements are now Ref.
>+
>+        * API/JSRetainPtr.h: While JSRetainPtr is written as a template,
>+        it only works for two specific unrelated types, JSStringRef and
>+        JSGlobalContextRef. Simplified the default constructor using data
>+        member initialization. Prepared to make the adopt constructor private
>+        (got everything compiling that way, then made it public again so that
>+        Apple internal software will still build). Got rid of unneeded
>+        templated constructor and assignment operator, since it's not relevant
>+        since there is no inheritance between JSRetainPtr template types.
>+        Added WARN_UNUSED_RETURN to leakRef as in RefPtr and RetainPtr.
>+        Added move constructor and move assignment operator for slightly better
>+        performance. Simplified implementations of various member functions
>+        so they are more obviously correct, by using leakPtr in more of them
>+        and using std::exchange to make the flow of values more obvious.
>+
>+        * API/JSValue.mm:
>+        (+[JSValue valueWithNewSymbolFromDescription:inContext:]): Added a
>+        missing JSStringRelease to fix a leak.
>+
>+        * API/tests/CustomGlobalObjectClassTest.c:
>+        (customGlobalObjectClassTest): Added a JSGlobalContextRelease to fix a leak.
>+        (globalObjectSetPrototypeTest): Ditto.
>+        (globalObjectPrivatePropertyTest): Ditto.
>+
>+        * API/tests/ExecutionTimeLimitTest.cpp:
>+        (testResetAfterTimeout): Added a call to JSStringRelease to fix a leak.
>+        (testExecutionTimeLimit): Ditto, lots more.
>+
>+        * API/tests/FunctionOverridesTest.cpp:
>+        (testFunctionOverrides): Added a call to JSStringRelease to fix a leak.
>+
>+        * API/tests/JSObjectGetProxyTargetTest.cpp:
>+        (testJSObjectGetProxyTarget): Added a call to JSGlobalContextRelease to fix
>+        a leak.
>+
>+        * API/tests/PingPongStackOverflowTest.cpp:
>+        (testPingPongStackOverflow): Added calls to JSGlobalContextRelease and
>+        JSStringRelease to fix leaks.
>+
>+        * API/tests/testapi.c:
>+        (throwException): Added. Helper function for repeated idiom where we want
>+        to throw an exception, but with additional JSStringRelease calls so we don't
>+        have to leak just to keep the code simpler to read.
>+        (MyObject_getProperty): Use throwException.
>+        (MyObject_setProperty): Ditto.
>+        (MyObject_deleteProperty): Ditto.
>+        (isValueEqualToString): Added. Helper function for an idiom where we check
>+        if something is a string and then if it's equal to a particular string
>+        constant, but a version that has an additional JSStringRelease call so we
>+        don't have to leak just to keep the code simpler to read.
>+        (MyObject_callAsFunction): Use isValueEqualToString and throwException.
>+        (MyObject_callAsConstructor): Ditto.
>+        (MyObject_hasInstance): Ditto.
>+        (globalContextNameTest): Added a JSGlobalContextRelease to fix a leak.
>+        (testMarkingConstraintsAndHeapFinalizers): Ditto.
>+
> 2018-09-14  Saam barati  <sbarati@apple.com>
> 
>         Don't dump OSRAvailabilityData in Graph::dump because a stale Availability may point to a Node that is already freed
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 09f4761d7248b8ab35d1dbcc9c85a705fd58096b..5b63797cbadf2f273a87a6822702d50d1f5ead20 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,14 @@
>+2018-09-08  Darin Adler  <darin@apple.com>
>+
>+        Streamline JSRetainPtr, fix leaks of JSString and JSGlobalContext
>+        https://bugs.webkit.org/show_bug.cgi?id=189455
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Modules/plugins/QuickTimePluginReplacement.mm:
>+        (WebCore::jsValueWithDictionaryInContext): Adding a missing
>+        JSStringRelease to fix a leak.
>+
> 2018-09-15  Rob Buis  <rbuis@igalia.com>
> 
>         XMLHttpRequest::createResponseBlob() should create a Blob with type for empty response
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 54441d45029076e2ab612c7a7e82bf622f2eb086..1fbad721573c8e432259bb98543b91d6586d376c 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,16 @@
>+2018-09-08  Darin Adler  <darin@apple.com>
>+
>+        Streamline JSRetainPtr, fix leaks of JSString and JSGlobalContext
>+        https://bugs.webkit.org/show_bug.cgi?id=189455
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebProcess/Automation/WebAutomationSessionProxy.cpp:
>+        (WebKit::toJSString): Use adopt function instead of adopt construuctor.
>+        (WebKit::evaluate): Ditto.
>+        (WebKit::evaluateJavaScriptCallback): Ditto.
>+        (WebKit::WebAutomationSessionProxy::evaluateJavaScriptFunction): Ditto.
>+
> 2018-09-14  Matt Lewis  <jlewis3@apple.com>
> 
>         Unreviewed, rolling out r236020.
>diff --git a/Source/JavaScriptCore/API/JSObjectRef.cpp b/Source/JavaScriptCore/API/JSObjectRef.cpp
>index 694d185fd50850250c27b014742940875e4dd2f6..4c201f82d7dd965ccad67cf4746f48a19348babf 100644
>--- a/Source/JavaScriptCore/API/JSObjectRef.cpp
>+++ b/Source/JavaScriptCore/API/JSObjectRef.cpp
>@@ -46,7 +46,6 @@
> #include "JSFunction.h"
> #include "JSGlobalObject.h"
> #include "JSObject.h"
>-#include "JSRetainPtr.h"
> #include "JSString.h"
> #include "JSValueRef.h"
> #include "ObjectConstructor.h"
>@@ -763,6 +762,7 @@ JSObjectRef JSObjectCallAsConstructor(JSContextRef ctx, JSObjectRef object, size
> struct OpaqueJSPropertyNameArray {
>     WTF_MAKE_FAST_ALLOCATED;
> public:
>+    // FIXME: Why not inherit from RefCounted?
>     OpaqueJSPropertyNameArray(VM* vm)
>         : refCount(0)
>         , vm(vm)
>@@ -771,7 +771,7 @@ public:
>     
>     unsigned refCount;
>     VM* vm;
>-    Vector<JSRetainPtr<JSStringRef>> array;
>+    Vector<Ref<OpaqueJSString>> array;
> };
> 
> JSPropertyNameArrayRef JSObjectCopyPropertyNames(JSContextRef ctx, JSObjectRef object)
>@@ -793,8 +793,8 @@ JSPropertyNameArrayRef JSObjectCopyPropertyNames(JSContextRef ctx, JSObjectRef o
>     size_t size = array.size();
>     propertyNames->array.reserveInitialCapacity(size);
>     for (size_t i = 0; i < size; ++i)
>-        propertyNames->array.uncheckedAppend(JSRetainPtr<JSStringRef>(Adopt, OpaqueJSString::create(array[i].string()).leakRef()));
>-    
>+        propertyNames->array.uncheckedAppend(OpaqueJSString::create(array[i].string()).releaseNonNull());
>+
>     return JSPropertyNameArrayRetain(propertyNames);
> }
> 
>@@ -819,7 +819,7 @@ size_t JSPropertyNameArrayGetCount(JSPropertyNameArrayRef array)
> 
> JSStringRef JSPropertyNameArrayGetNameAtIndex(JSPropertyNameArrayRef array, size_t index)
> {
>-    return array->array[static_cast<unsigned>(index)].get();
>+    return array->array[static_cast<unsigned>(index)].ptr();
> }
> 
> void JSPropertyNameAccumulatorAddName(JSPropertyNameAccumulatorRef array, JSStringRef propertyName)
>diff --git a/Source/JavaScriptCore/API/JSRetainPtr.h b/Source/JavaScriptCore/API/JSRetainPtr.h
>index e400840803c71087cc7d6d6ef48ce41076fb8260..fd8412f3ec1ec4389fca4ae48021225982b7b843 100644
>--- a/Source/JavaScriptCore/API/JSRetainPtr.h
>+++ b/Source/JavaScriptCore/API/JSRetainPtr.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
>+ * Copyright (C) 2005-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -26,8 +26,7 @@
>  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
>-#ifndef JSRetainPtr_h
>-#define JSRetainPtr_h
>+#pragma once
> 
> #include <JavaScriptCore/JSContextRef.h>
> #include <JavaScriptCore/JSStringRef.h>
>@@ -42,17 +41,16 @@ enum AdoptTag { Adopt };
> 
> template<typename T> class JSRetainPtr {
> public:
>-    JSRetainPtr() : m_ptr(0) { }
>+    JSRetainPtr() = default;
>     JSRetainPtr(T ptr) : m_ptr(ptr) { if (ptr) JSRetain(ptr); }
>-    JSRetainPtr(AdoptTag, T ptr) : m_ptr(ptr) { }
>     JSRetainPtr(const JSRetainPtr&);
>-    template<typename U> JSRetainPtr(const JSRetainPtr<U>&);
>+    JSRetainPtr(JSRetainPtr&&);
>     ~JSRetainPtr();
>     
>     T get() const { return m_ptr; }
>     
>     void clear();
>-    T leakRef();
>+    T leakRef() WARN_UNUSED_RETURN;
> 
>     T operator->() const { return m_ptr; }
>     
>@@ -60,18 +58,30 @@ public:
>     explicit operator bool() const { return m_ptr; }
> 
>     JSRetainPtr& operator=(const JSRetainPtr&);
>-    template<typename U> JSRetainPtr& operator=(const JSRetainPtr<U>&);
>+    JSRetainPtr& operator=(JSRetainPtr&&);
>     JSRetainPtr& operator=(T);
>-    template<typename U> JSRetainPtr& operator=(U*);
> 
>-    void adopt(T);
>-    
>     void swap(JSRetainPtr&);
> 
>+    friend JSRetainPtr<JSStringRef> adopt(JSStringRef);
>+    friend JSRetainPtr<JSGlobalContextRef> adopt(JSGlobalContextRef);
>+
>+    // FIXME: Make this private once Apple's internal code is updated to not rely on it.
>+    // https://bugs.webkit.org/show_bug.cgi?id=189644
>+    JSRetainPtr(AdoptTag, T);
>+
> private:
>-    T m_ptr;
>+    T m_ptr { nullptr };
> };
> 
>+JSRetainPtr<JSStringRef> adopt(JSStringRef);
>+JSRetainPtr<JSGlobalContextRef> adopt(JSGlobalContextRef);
>+
>+template<typename T> inline JSRetainPtr<T>::JSRetainPtr(AdoptTag, T ptr)
>+    : m_ptr(ptr)
>+{
>+}
>+
> inline JSRetainPtr<JSStringRef> adopt(JSStringRef o)
> {
>     return JSRetainPtr<JSStringRef>(Adopt, o);
>@@ -89,11 +99,9 @@ template<typename T> inline JSRetainPtr<T>::JSRetainPtr(const JSRetainPtr& o)
>         JSRetain(m_ptr);
> }
> 
>-template<typename T> template<typename U> inline JSRetainPtr<T>::JSRetainPtr(const JSRetainPtr<U>& o)
>-    : m_ptr(o.get())
>+template<typename T> inline JSRetainPtr<T>::JSRetainPtr(JSRetainPtr&& o)
>+    : m_ptr(o.leakRef())
> {
>-    if (m_ptr)
>-        JSRetain(m_ptr);
> }
> 
> template<typename T> inline JSRetainPtr<T>::~JSRetainPtr()
>@@ -104,39 +112,23 @@ template<typename T> inline JSRetainPtr<T>::~JSRetainPtr()
> 
> template<typename T> inline void JSRetainPtr<T>::clear()
> {
>-    if (T ptr = m_ptr) {
>-        m_ptr = 0;
>+    if (T ptr = leakRef())
>         JSRelease(ptr);
>-    }
> }
> 
> template<typename T> inline T JSRetainPtr<T>::leakRef()
> {
>-    T ptr = m_ptr;
>-    m_ptr = 0;
>-    return ptr;
>+    return std::exchange(m_ptr, nullptr);
> }
> 
> template<typename T> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(const JSRetainPtr<T>& o)
> {
>-    T optr = o.get();
>-    if (optr)
>-        JSRetain(optr);
>-    T ptr = m_ptr;
>-    m_ptr = optr;
>-    if (ptr)
>-        JSRelease(ptr);
>-    return *this;
>+    return operator=(o.get());
> }
> 
>-template<typename T> template<typename U> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(const JSRetainPtr<U>& o)
>+template<typename T> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(JSRetainPtr&& o)
> {
>-    T optr = o.get();
>-    if (optr)
>-        JSRetain(optr);
>-    T ptr = m_ptr;
>-    m_ptr = optr;
>-    if (ptr)
>+    if (T ptr = std::exchange(m_ptr, o.leakRef()))
>         JSRelease(ptr);
>     return *this;
> }
>@@ -145,28 +137,7 @@ template<typename T> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(T optr)
> {
>     if (optr)
>         JSRetain(optr);
>-    T ptr = m_ptr;
>-    m_ptr = optr;
>-    if (ptr)
>-        JSRelease(ptr);
>-    return *this;
>-}
>-
>-template<typename T> inline void JSRetainPtr<T>::adopt(T optr)
>-{
>-    T ptr = m_ptr;
>-    m_ptr = optr;
>-    if (ptr)
>-        JSRelease(ptr);
>-}
>-
>-template<typename T> template<typename U> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(U* optr)
>-{
>-    if (optr)
>-        JSRetain(optr);
>-    T ptr = m_ptr;
>-    m_ptr = optr;
>-    if (ptr)
>+    if (T ptr = std::exchange(m_ptr, optr))
>         JSRelease(ptr);
>     return *this;
> }
>@@ -210,6 +181,3 @@ template<typename T, typename U> inline bool operator!=(T* a, const JSRetainPtr<
> { 
>     return a != b.get(); 
> }
>-
>-
>-#endif // JSRetainPtr_h
>diff --git a/Source/JavaScriptCore/API/JSValue.mm b/Source/JavaScriptCore/API/JSValue.mm
>index df45fc0dc89ee9e576093e4506f57a94269651d6..9e49ae2472368de99cb44af7896da79902db29de 100644
>--- a/Source/JavaScriptCore/API/JSValue.mm
>+++ b/Source/JavaScriptCore/API/JSValue.mm
>@@ -154,8 +154,10 @@ + (JSValue *)valueWithUndefinedInContext:(JSContext *)context
> 
> + (JSValue *)valueWithNewSymbolFromDescription:(NSString *)description inContext:(JSContext *)context
> {
>-    JSStringRef string = JSStringCreateWithCFString(reinterpret_cast<CFStringRef>(description));
>-    return [JSValue valueWithJSValueRef:JSValueMakeSymbol([context JSGlobalContextRef], string) inContext:context];
>+    JSStringRef string = JSStringCreateWithCFString((__bridge CFStringRef)description);
>+    auto value = [JSValue valueWithJSValueRef:JSValueMakeSymbol([context JSGlobalContextRef], string) inContext:context];
>+    JSStringRelease(string);
>+    return value;
> }
> 
> 
>diff --git a/Source/JavaScriptCore/API/tests/CustomGlobalObjectClassTest.c b/Source/JavaScriptCore/API/tests/CustomGlobalObjectClassTest.c
>index 9ffe233f4b796f5a0b95b374a483b014ed5bdd97..82d2dc17d380dd2bd8ca7c903e47966eac70c411 100644
>--- a/Source/JavaScriptCore/API/tests/CustomGlobalObjectClassTest.c
>+++ b/Source/JavaScriptCore/API/tests/CustomGlobalObjectClassTest.c
>@@ -101,6 +101,8 @@ void customGlobalObjectClassTest()
>     JSStringRelease(script);
> 
>     assertTrue(executedCallback, "Executed custom global object callback");
>+
>+    JSGlobalContextRelease(globalContext);
> }
> 
> void globalObjectSetPrototypeTest()
>@@ -116,6 +118,7 @@ void globalObjectSetPrototypeTest()
>     JSObjectSetPrototype(context, object, above);
>     JSValueRef prototypeAfterChangingAttempt = JSObjectGetPrototype(context, object);
>     assertTrue(JSValueIsStrictEqual(context, prototypeAfterChangingAttempt, originalPrototype), "Global object's [[Prototype]] cannot be changed after instantiating it");
>+    JSGlobalContextRelease(context);
> }
> 
> void globalObjectPrivatePropertyTest()
>@@ -137,4 +140,5 @@ void globalObjectPrivatePropertyTest()
>     assertTrue(JSValueIsNull(context, result), "Deleted private property is indeed no longer present");
> 
>     JSStringRelease(privateName);
>+    JSGlobalContextRelease(context);
> }
>diff --git a/Source/JavaScriptCore/API/tests/ExecutionTimeLimitTest.cpp b/Source/JavaScriptCore/API/tests/ExecutionTimeLimitTest.cpp
>index 637b3049c3d7e06e3f645386e42835e1b596d046..ac8010a7fd34b3511f04787b8565db6174c71654 100644
>--- a/Source/JavaScriptCore/API/tests/ExecutionTimeLimitTest.cpp
>+++ b/Source/JavaScriptCore/API/tests/ExecutionTimeLimitTest.cpp
>@@ -106,6 +106,7 @@ static void testResetAfterTimeout(bool& failed)
>     const char* reentryScript = "100";
>     JSStringRef script = JSStringCreateWithUTF8CString(reentryScript);
>     v = JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
>+    JSStringRelease(script);
>     if (exception) {
>         printf("FAIL: Watchdog timeout was not reset.\n");
>         failed = true;
>@@ -181,6 +182,8 @@ int testExecutionTimeLimit()
> 
>             thread->waitForCompletion();
>             testResetAfterTimeout(failed);
>+
>+            JSStringRelease(script);
>         }
> 
>         /* Test script timeout: */
>@@ -200,6 +203,7 @@ int testExecutionTimeLimit()
>             auto startTime = CPUTime::forCurrentThread();
>             JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
>             auto endTime = CPUTime::forCurrentThread();
>+            JSStringRelease(script);
> 
>             if (((endTime - startTime) < timeAfterWatchdogShouldHaveFired) && shouldTerminateCallbackWasCalled)
>                 printf("PASS: %s script timed out as expected.\n", tierOptions.tier);
>@@ -243,6 +247,7 @@ int testExecutionTimeLimit()
>             auto startTime = CPUTime::forCurrentThread();
>             JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
>             auto endTime = CPUTime::forCurrentThread();
>+            JSStringRelease(script);
> 
>             if (((endTime - startTime) < timeAfterWatchdogShouldHaveFired) && shouldTerminateCallbackWasCalled)
>                 printf("PASS: %s script with infinite tail calls timed out as expected .\n", tierOptions.tier);
>@@ -281,6 +286,8 @@ int testExecutionTimeLimit()
>             JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
>             auto endTime = CPUTime::forCurrentThread();
>             
>+            JSStringRelease(script);
>+
>             if (((endTime - startTime) >= timeAfterWatchdogShouldHaveFired) || !shouldTerminateCallbackWasCalled) {
>                 if (!((endTime - startTime) < timeAfterWatchdogShouldHaveFired))
>                     printf("FAIL: %s script did not time out as expected.\n", tierOptions.tier);
>@@ -318,6 +325,8 @@ int testExecutionTimeLimit()
>             JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
>             auto endTime = CPUTime::forCurrentThread();
>             
>+            JSStringRelease(script);
>+
>             if (((endTime - startTime) < timeAfterWatchdogShouldHaveFired) && !shouldTerminateCallbackWasCalled)
>                 printf("PASS: %s script timed out as expected when no callback is specified.\n", tierOptions.tier);
>             else {
>@@ -355,6 +364,8 @@ int testExecutionTimeLimit()
>             JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
>             auto endTime = CPUTime::forCurrentThread();
>             
>+            JSStringRelease(script);
>+
>             if (((endTime - startTime) >= timeAfterWatchdogShouldHaveFired) && cancelTerminateCallbackWasCalled && !exception)
>                 printf("PASS: %s script timeout was cancelled as expected.\n", tierOptions.tier);
>             else {
>@@ -393,6 +404,8 @@ int testExecutionTimeLimit()
>             auto endTime = CPUTime::forCurrentThread();
>             auto deltaTime = endTime - startTime;
>             
>+            JSStringRelease(script);
>+
>             if ((deltaTime >= timeBeforeExtendedDeadline) && (deltaTime < timeAfterExtendedDeadline) && (extendTerminateCallbackCalled == 2) && exception)
>                 printf("PASS: %s script timeout was extended as expected.\n", tierOptions.tier);
>             else {
>@@ -469,6 +482,8 @@ int testExecutionTimeLimit()
>                     printf("FAIL: %s script on dispatch queue timeout callback was not called.\n", tierOptions.tier);
>                 failed = true;
>             }
>+
>+            JSStringRelease(script);
>         }
> #endif
> 
>diff --git a/Source/JavaScriptCore/API/tests/FunctionOverridesTest.cpp b/Source/JavaScriptCore/API/tests/FunctionOverridesTest.cpp
>index cf0d6dc0419eba9e5afc50a9e65417911a450df8..83896150f03a36289753c3d1539c8ee70b1bf05d 100644
>--- a/Source/JavaScriptCore/API/tests/FunctionOverridesTest.cpp
>+++ b/Source/JavaScriptCore/API/tests/FunctionOverridesTest.cpp
>@@ -76,6 +76,7 @@ int testFunctionOverrides()
>     JSStringRef script = JSStringCreateWithUTF8CString(scriptString);
>     JSValueRef exception = nullptr;
>     JSValueRef resultRef = JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
>+    JSStringRelease(script);
> 
>     if (!JSValueIsBoolean(context, resultRef) || !JSValueToBoolean(context, resultRef))
>         failed = true;
>diff --git a/Source/JavaScriptCore/API/tests/JSObjectGetProxyTargetTest.cpp b/Source/JavaScriptCore/API/tests/JSObjectGetProxyTargetTest.cpp
>index 7f2c3fe036ec249e254219a0a38f446b144ca8c7..71821eaeb627f23330ae499bd30c40d3ec5e5b19 100644
>--- a/Source/JavaScriptCore/API/tests/JSObjectGetProxyTargetTest.cpp
>+++ b/Source/JavaScriptCore/API/tests/JSObjectGetProxyTargetTest.cpp
>@@ -49,7 +49,7 @@ int testJSObjectGetProxyTarget()
>     };
>     
>     JSContextGroupRef group = JSContextGroupCreate();
>-    JSContextRef context = JSGlobalContextCreateInGroup(group, nullptr);
>+    JSGlobalContextRef context = JSGlobalContextCreateInGroup(group, nullptr);
>     
>     ExecState* exec = toJS(context);
>     VM& vm = *toJS(group);
>@@ -96,7 +96,8 @@ int testJSObjectGetProxyTarget()
>     test("proxy target of ProxyObject works", JSObjectGetProxyTarget(proxyObject) == array);
>     
>     test("proxy target of GlobalObject is the globalObject", JSObjectGetProxyTarget(globalObjectProxy) == globalObject);
>-    
>+
>+    JSGlobalContextRelease(context);
>     JSContextGroupRelease(group);
> 
>     printf("JSObjectGetProxyTargetTest: %s\n", overallResult ? "PASS" : "FAIL");
>diff --git a/Source/JavaScriptCore/API/tests/PingPongStackOverflowTest.cpp b/Source/JavaScriptCore/API/tests/PingPongStackOverflowTest.cpp
>index 042bebf5d07744bc42a8c734f7901144d360dae8..fbe46872032b8610903345f647eadda34c0d8991 100644
>--- a/Source/JavaScriptCore/API/tests/PingPongStackOverflowTest.cpp
>+++ b/Source/JavaScriptCore/API/tests/PingPongStackOverflowTest.cpp
>@@ -162,6 +162,10 @@ int testPingPongStackOverflow()
>     exception = nullptr;
>     JSEvaluateScript(context, script, nullptr, nullptr, 1, &exception);
> 
>+    JSGlobalContextRelease(context);
>+    context = nullptr;
>+    JSStringRelease(script);
>+
>     if (!exception) {
>         printf("FAIL: PingPongStackOverflowError not thrown in PingPongStackOverflow test\n");
>         failed = true;
>diff --git a/Source/JavaScriptCore/API/tests/testapi.c b/Source/JavaScriptCore/API/tests/testapi.c
>index 78ad7d6066ece090f27bd6a732e104755327deb6..8ba0449e89e87b5e0101b6fc99e35ffae0453a23 100644
>--- a/Source/JavaScriptCore/API/tests/testapi.c
>+++ b/Source/JavaScriptCore/API/tests/testapi.c
>@@ -201,6 +201,16 @@ static bool MyObject_hasProperty(JSContextRef context, JSObjectRef object, JSStr
>     return false;
> }
> 
>+static JSValueRef throwException(JSContextRef context, JSObjectRef object, JSValueRef* exception)
>+{
>+    JSStringRef script = JSStringCreateWithUTF8CString("throw 'an exception'");
>+    JSStringRef sourceURL = JSStringCreateWithUTF8CString("test script");
>+    JSValueRef result = JSEvaluateScript(context, script, object, sourceURL, 1, exception);
>+    JSStringRelease(script);
>+    JSStringRelease(sourceURL);
>+    return result;
>+}
>+
> static JSValueRef MyObject_getProperty(JSContextRef context, JSObjectRef object, JSStringRef propertyName, JSValueRef* exception)
> {
>     UNUSED_PARAM(context);
>@@ -223,7 +233,7 @@ static JSValueRef MyObject_getProperty(JSContextRef context, JSObjectRef object,
>     }
> 
>     if (JSStringIsEqualToUTF8CString(propertyName, "throwOnGet")) {
>-        return JSEvaluateScript(context, JSStringCreateWithUTF8CString("throw 'an exception'"), object, JSStringCreateWithUTF8CString("test script"), 1, exception);
>+        return throwException(context, object, exception);
>     }
> 
>     if (JSStringIsEqualToUTF8CString(propertyName, "0")) {
>@@ -245,7 +255,7 @@ static bool MyObject_setProperty(JSContextRef context, JSObjectRef object, JSStr
>         return true; // pretend we set the property in order to swallow it
>     
>     if (JSStringIsEqualToUTF8CString(propertyName, "throwOnSet")) {
>-        JSEvaluateScript(context, JSStringCreateWithUTF8CString("throw 'an exception'"), object, JSStringCreateWithUTF8CString("test script"), 1, exception);
>+        throwException(context, object, exception);
>     }
>     
>     return false;
>@@ -260,7 +270,7 @@ static bool MyObject_deleteProperty(JSContextRef context, JSObjectRef object, JS
>         return true;
>     
>     if (JSStringIsEqualToUTF8CString(propertyName, "throwOnDelete")) {
>-        JSEvaluateScript(context, JSStringCreateWithUTF8CString("throw 'an exception'"), object, JSStringCreateWithUTF8CString("test script"), 1, exception);
>+        throwException(context, object, exception);
>         return false;
>     }
> 
>@@ -283,6 +293,18 @@ static void MyObject_getPropertyNames(JSContextRef context, JSObjectRef object,
>     JSStringRelease(propertyName);
> }
> 
>+static bool isValueEqualToString(JSContextRef context, JSValueRef value, const char* string)
>+{
>+    if (!JSValueIsString(context, value))
>+        return false;
>+    JSStringRef valueString = JSValueToStringCopy(context, value, NULL);
>+    if (!valueString)
>+        return false;
>+    bool isEqual = JSStringIsEqualToUTF8CString(valueString, string);
>+    JSStringRelease(valueString);
>+    return isEqual;
>+}
>+
> static JSValueRef MyObject_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>     UNUSED_PARAM(context);
>@@ -290,8 +312,8 @@ static JSValueRef MyObject_callAsFunction(JSContextRef context, JSObjectRef obje
>     UNUSED_PARAM(thisObject);
>     UNUSED_PARAM(exception);
> 
>-    if (argumentCount > 0 && JSValueIsString(context, arguments[0]) && JSStringIsEqualToUTF8CString(JSValueToStringCopy(context, arguments[0], 0), "throwOnCall")) {
>-        JSEvaluateScript(context, JSStringCreateWithUTF8CString("throw 'an exception'"), object, JSStringCreateWithUTF8CString("test script"), 1, exception);
>+    if (argumentCount > 0 && isValueEqualToString(context, arguments[0], "throwOnCall")) {
>+        throwException(context, object, exception);
>         return JSValueMakeUndefined(context);
>     }
> 
>@@ -306,8 +328,8 @@ static JSObjectRef MyObject_callAsConstructor(JSContextRef context, JSObjectRef
>     UNUSED_PARAM(context);
>     UNUSED_PARAM(object);
> 
>-    if (argumentCount > 0 && JSValueIsString(context, arguments[0]) && JSStringIsEqualToUTF8CString(JSValueToStringCopy(context, arguments[0], 0), "throwOnConstruct")) {
>-        JSEvaluateScript(context, JSStringCreateWithUTF8CString("throw 'an exception'"), object, JSStringCreateWithUTF8CString("test script"), 1, exception);
>+    if (argumentCount > 0 && isValueEqualToString(context, arguments[0], "throwOnConstruct")) {
>+        throwException(context, object, exception);
>         return object;
>     }
> 
>@@ -322,8 +344,8 @@ static bool MyObject_hasInstance(JSContextRef context, JSObjectRef constructor,
>     UNUSED_PARAM(context);
>     UNUSED_PARAM(constructor);
> 
>-    if (JSValueIsString(context, possibleValue) && JSStringIsEqualToUTF8CString(JSValueToStringCopy(context, possibleValue, 0), "throwOnHasInstance")) {
>-        JSEvaluateScript(context, JSStringCreateWithUTF8CString("throw 'an exception'"), constructor, JSStringCreateWithUTF8CString("test script"), 1, exception);
>+    if (isValueEqualToString(context, possibleValue, "throwOnHasInstance")) {
>+        throwException(context, constructor, exception);
>         return false;
>     }
> 
>@@ -1137,6 +1159,8 @@ static bool globalContextNameTest()
>     JSStringRelease(fetchName1);
>     JSStringRelease(fetchName2);
> 
>+    JSGlobalContextRelease(context);
>+
>     return result;
> }
> 
>@@ -1191,7 +1215,6 @@ static void heapFinalizer(JSContextGroupRef group, void *userData)
> static void testMarkingConstraintsAndHeapFinalizers(void)
> {
>     JSContextGroupRef group;
>-    JSContextRef context;
>     JSWeakRef *weakRefs;
>     unsigned i;
>     unsigned deadCount;
>@@ -1201,7 +1224,7 @@ static void testMarkingConstraintsAndHeapFinalizers(void)
>     group = JSContextGroupCreate();
>     expectedContextGroup = group;
>     
>-    context = JSGlobalContextCreateInGroup(group, NULL);
>+    JSGlobalContextRef context = JSGlobalContextCreateInGroup(group, NULL);
> 
>     weakRefs = (JSWeakRef*)calloc(numWeakRefs, sizeof(JSWeakRef));
> 
>@@ -1238,7 +1261,8 @@ static void testMarkingConstraintsAndHeapFinalizers(void)
>     didRunHeapFinalizer = false;
>     JSSynchronousGarbageCollectForDebugging(context);
>     assertTrue(!didRunHeapFinalizer, "Did not run heap finalizer");
>-    
>+
>+    JSGlobalContextRelease(context);
>     JSContextGroupRelease(group);
> 
>     printf("PASS: Marking Constraints and Heap Finalizers.\n");
>diff --git a/Source/WebCore/Modules/plugins/QuickTimePluginReplacement.mm b/Source/WebCore/Modules/plugins/QuickTimePluginReplacement.mm
>index 3dfd97bf6d27088ec911ab34e1d1d388bd227504..ca34d8172e25314ab8a37bf49e85085c6f8fb9f5 100644
>--- a/Source/WebCore/Modules/plugins/QuickTimePluginReplacement.mm
>+++ b/Source/WebCore/Modules/plugins/QuickTimePluginReplacement.mm
>@@ -308,8 +308,9 @@ static JSValue *jsValueWithDictionaryInContext(NSDictionary *dictionary, JSConte
>         if (!value)
>             continue;
> 
>-        JSStringRef name = JSStringCreateWithCFString((CFStringRef)key);
>+        JSStringRef name = JSStringCreateWithCFString((__bridge CFStringRef)key);
>         JSObjectSetProperty([context JSGlobalContextRef], resultObject, name, [value JSValueRef], 0, &exception);
>+        JSStringRelease(name);
>         if (exception)
>             continue;
>     }
>diff --git a/Source/WebKit/WebProcess/Automation/WebAutomationSessionProxy.cpp b/Source/WebKit/WebProcess/Automation/WebAutomationSessionProxy.cpp
>index dd978b07e79deb959e93304474aa0585c9592e8c..fa6df2abe9ffca3fe50a89b81cacb0995dca3ad7 100644
>--- a/Source/WebKit/WebProcess/Automation/WebAutomationSessionProxy.cpp
>+++ b/Source/WebKit/WebProcess/Automation/WebAutomationSessionProxy.cpp
>@@ -89,7 +89,7 @@ static JSObjectRef toJSArray(JSContextRef context, const Vector<T>& data, JSValu
> 
> static inline JSRetainPtr<JSStringRef> toJSString(const String& string)
> {
>-    return JSRetainPtr<JSStringRef>(Adopt, OpaqueJSString::create(string).leakRef());
>+    return adopt(OpaqueJSString::create(string).leakRef());
> }
> 
> static inline JSValueRef toJSValue(JSContextRef context, const String& string)
>@@ -127,7 +127,7 @@ static JSValueRef evaluate(JSContextRef context, JSObjectRef function, JSObjectR
>     if (argumentCount != 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> script(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto script = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     return JSEvaluateScript(context, script.get(), nullptr, nullptr, 0, exception);
> }
> 
>@@ -150,7 +150,7 @@ static JSValueRef evaluateJavaScriptCallback(JSContextRef context, JSObjectRef f
> 
>     uint64_t frameID = JSValueToNumber(context, arguments[0], exception);
>     uint64_t callbackID = JSValueToNumber(context, arguments[1], exception);
>-    JSRetainPtr<JSStringRef> result(Adopt, JSValueToStringCopy(context, arguments[2], exception));
>+    auto result = adopt(JSValueToStringCopy(context, arguments[2], exception));
> 
>     bool resultIsErrorName = JSValueToBoolean(context, arguments[3]);
> 
>@@ -287,7 +287,7 @@ void WebAutomationSessionProxy::evaluateJavaScriptFunction(uint64_t pageID, uint
>     JSRetainPtr<JSStringRef> exceptionMessage;
>     if (JSValueIsObject(context, exception)) {
>         JSValueRef nameValue = JSObjectGetProperty(context, const_cast<JSObjectRef>(exception), toJSString("name"_s).get(), nullptr);
>-        JSRetainPtr<JSStringRef> exceptionName(Adopt, JSValueToStringCopy(context, nameValue, nullptr));
>+        auto exceptionName = adopt(JSValueToStringCopy(context, nameValue, nullptr));
>         if (exceptionName->string() == "NodeNotFound")
>             errorType = Inspector::Protocol::AutomationHelpers::getEnumConstantValue(Inspector::Protocol::Automation::ErrorMessage::NodeNotFound);
>         else if (exceptionName->string() == "InvalidElementState")
>@@ -298,9 +298,9 @@ void WebAutomationSessionProxy::evaluateJavaScriptFunction(uint64_t pageID, uint
>             errorType = Inspector::Protocol::AutomationHelpers::getEnumConstantValue(Inspector::Protocol::Automation::ErrorMessage::InvalidSelector);
> 
>         JSValueRef messageValue = JSObjectGetProperty(context, const_cast<JSObjectRef>(exception), toJSString("message"_s).get(), nullptr);
>-        exceptionMessage.adopt(JSValueToStringCopy(context, messageValue, nullptr));
>+        exceptionMessage = adopt(JSValueToStringCopy(context, messageValue, nullptr));
>     } else
>-        exceptionMessage.adopt(JSValueToStringCopy(context, exception, nullptr));
>+        exceptionMessage = adopt(JSValueToStringCopy(context, exception, nullptr));
> 
>     didEvaluateJavaScriptFunction(frameID, callbackID, exceptionMessage->string(), errorType);
> }
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index 9451030ee3889ae873c6a382d0e9f66de16557f2..d7d1ec2d509e0285b2cd8820451d8a8c5e443757 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,467 @@
>+2018-09-08  Darin Adler  <darin@apple.com>
>+
>+        Streamline JSRetainPtr, fix leaks of JSString and JSGlobalContext
>+        https://bugs.webkit.org/show_bug.cgi?id=189455
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        There is a lot of copied and pasted code for WebKit vs. Legacy WebKit
>+        testing and even for macOS vs. iOS vs. Windows platform-specific code.
>+        For now, this patch just makes corresponding changes to the copied code.
>+        Later we might get better results by merging more code instead of having
>+        all these separate copies.
>+
>+        * DumpRenderTree/AccessibilityController.cpp:
>+        (AccessibilityController::makeWindowObject): Use the adopt function
>+        instead of the special Adopt constructor of JSRetainPtr.
>+
>+        * DumpRenderTree/AccessibilityTextMarker.cpp: Removed unneeded include.
>+
>+        * DumpRenderTree/AccessibilityUIElement.cpp: Ditto.
>+        (allAttributesCallback): Don't adopt at this level; changed the
>+        underlying function to return a JSRetainPtr so the adopt is right next
>+        to the call to the create or copy function.
>+        (attributesOfLinkedUIElementsCallback): Ditto.
>+        (attributesOfDocumentLinksCallback): Ditto.
>+        (attributesOfChildrenCallback): Ditto.
>+        (parameterizedAttributeNamesCallback): Ditto.
>+        (attributesOfColumnHeadersCallback): Ditto.
>+        (attributesOfRowHeadersCallback): Ditto.
>+        (attributesOfColumnsCallback): Ditto.
>+        (attributesOfRowsCallback): Ditto.
>+        (attributesOfVisibleCellsCallback): Ditto.
>+        (attributesOfHeaderCallback): Ditto.
>+        (rowIndexRangeCallback): Ditto.
>+        (columnIndexRangeCallback): Ditto.
>+        (rangeForLineCallback): Ditto.
>+        (boundsForRangeCallback): Ditto.
>+        (rangeForPositionCallback): Ditto.
>+        (stringForRangeCallback): Ditto.
>+        (attributedStringForRangeCallback): Ditto.
>+        (uiElementCountForSearchPredicateCallback): Use the free adopt
>+        function instead of the adopt member function.
>+        (uiElementForSearchPredicateCallback): Ditto.
>+        (selectTextWithCriteriaCallback): Don't adopt at this level.
>+        (attributedStringForElementCallback): Ditto.
>+        (setValueCallback): Use free adopt.
>+        (stringAttributeValueCallback): Don't adopt at this level.
>+        (uiElementArrayAttributeValueCallback): Ditto.
>+        (uiElementAttributeValueCallback): Ditto.
>+        (stringForTextMarkerRangeCallback): Ditto.
>+        (attributedStringForTextMarkerRangeCallback): Ditto.
>+        (attributedStringForTextMarkerRangeWithOptionsCallback): Ditto.
>+        (getARIADropEffectsCallback): Ditto.
>+        (getClassListCallback): Ditto.
>+        (getRoleCallback): Ditto.
>+        (getSubroleCallback): Ditto.
>+        (getRoleDescriptionCallback): Ditto.
>+        (getComputedRoleStringCallback): Ditto.
>+        (getTitleCallback): Ditto.
>+        (getDescriptionCallback): Ditto.
>+        (getStringValueCallback): Ditto.
>+        (getLanguageCallback): Ditto.
>+        (getHelpTextCallback): Ditto.
>+        (getOrientationCallback): Ditto.
>+        (getPathDescriptionCallback): Ditto.
>+        (getSelectedTextRangeCallback): Ditto.
>+        (speakAsCallback): Ditto.
>+        (getValueDescriptionCallback): Ditto.
>+        (getAccessibilityValueCallback): Ditto.
>+        (getDocumentEncodingCallback): Ditto.
>+        (getDocumentURICallback): Ditto.
>+        (getURLCallback): Ditto.
>+        (characterAtOffsetCallback): Ditto.
>+        (wordAtOffsetCallback): Ditto.
>+        (lineAtOffsetCallback): Ditto.
>+        (sentenceAtOffsetCallback): Ditto.
>+        (stringForSelectionCallback): Ditto.
>+        (getIdentifierCallback): Ditto.
>+        (getTraitsCallback): Ditto.
>+        (supportedActionsCallback): Ditto.
>+        (mathPostscriptsDescriptionCallback): Ditto.
>+        (mathPrescriptsDescriptionCallback): Ditto.
>+        (AccessibilityUIElement::rangeForLine): Updated to return JSRetainPtr.
>+        (AccessibilityUIElement::rangeForPosition): Ditto.
>+        (AccessibilityUIElement::speakAs): Ditto.
>+        (AccessibilityUIElement::pathDescription const): Ditto.
>+        (AccessibilityUIElement::stringForTextMarkerRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForTextMarkerRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions): Ditto.
>+
>+        * DumpRenderTree/AccessibilityUIElement.h: Use JSRetainPtr instead of
>+        raw pointers for the results of the functions that create strings.
>+        The old way was difficult to get right; the functions didn't even follow
>+        the create/copy naming rule.
>+
>+        * DumpRenderTree/Bindings/CodeGeneratorDumpRenderTree.pm:
>+        (_platformTypeConstructor): Use the adopt function instead of the
>+        JSRetainPtr adopt constructor. Also nullptr instead of 0.
>+
>+        * DumpRenderTree/GCController.cpp:
>+        (GCController::makeWindowObject): Use adopt function instead of constructor.
>+
>+        * DumpRenderTree/TestRunner.cpp:
>+        (pathToLocalResourceCallback): Use adopt function instead of constructor.
>+        (addDisallowedURLCallback): Ditto.
>+        (addURLToRedirectCallback): Ditto.
>+        (clearApplicationCacheForOriginCallback): Ditto.
>+        (applicationCacheDiskUsageForOriginCallback): Ditto.
>+        (decodeHostNameCallback): Don't adopt at this level.
>+        (encodeHostNameCallback): Ditto.
>+        (execCommandCallback): Use adopt instead of JSRetainPtr::adopt.
>+        (findStringCallback): Use adopt function instead of constructor.
>+        (isCommandEnabledCallback): Ditto.
>+        (overridePreferenceCallback): Ditto.
>+        (queueLoadCallback): Ditto.
>+        (queueLoadHTMLStringCallback): Ditto.
>+        (queueLoadingScriptCallback): Ditto.
>+        (queueNonLoadingScriptCallback): Ditto.
>+        (setAuthenticationPasswordCallback): Ditto.
>+        (setAuthenticationUsernameCallback): Ditto.
>+        (setDomainRelaxationForbiddenForURLSchemeCallback): Ditto.
>+        (setMockGeolocationPositionUnavailableErrorCallback): Ditto.
>+        (setPOSIXLocaleCallback): Ditto.
>+        (setPersistentUserStyleSheetLocationCallback): Ditto.
>+        (setUserStyleSheetLocationCallback): Ditto.
>+        (setValueForUserCallback): Ditto.
>+        (setWillSendRequestClearHeaderCallback): Ditto.
>+        (setPageVisibilityCallback): Ditto.
>+        (evaluateInWebInspectorCallback): Ditto.
>+        (evaluateScriptInIsolatedWorldCallback): Ditto.
>+        (evaluateScriptInIsolatedWorldAndReturnValueCallback): Ditto.
>+        (addOriginAccessWhitelistEntryCallback): Ditto.
>+        (removeOriginAccessWhitelistEntryCallback): Ditto.
>+        (setScrollbarPolicyCallback): Ditto.
>+        (addUserScriptCallback): Ditto.
>+        (addUserStyleSheetCallback): Ditto.
>+        (apiTestNewWindowDataLoadBaseURLCallback): Ditto.
>+        (authenticateSessionCallback): Ditto.
>+        (getTitleTextDirectionCallback): Ditto.
>+        (getInspectorTestStubURLCallback): Ditto.
>+        (simulateLegacyWebNotificationClickCallback): Ditto.
>+        (setTextDirectionCallback): Ditto.
>+        (grantWebNotificationPermissionCallback): Ditto.
>+        (denyWebNotificationPermissionCallback): Ditto.
>+        (accummulateLogsForChannel): Ditto.
>+        (runUIScriptCallback): Ditto.
>+        (TestRunner::makeWindowObject): Ditto.
>+        (TestRunner::uiScriptDidComplete): Ditto.
>+        (TestRunner::setOpenPanelFiles): Ditto.
>+
>+        * DumpRenderTree/TestRunner.h: Use JSRetainPtr instead of
>+        raw pointers for the results of the functions that create strings.
>+
>+        * DumpRenderTree/ios/AccessibilityControllerIOS.mm:
>+        (AccessibilityController::platformName const): Use the adopt
>+        function instead of the adopt constructor.
>+
>+        * DumpRenderTree/ios/AccessibilityUIElementIOS.mm:
>+        (createEmptyJSString): Added. This helper function makes reduces the
>+        repetitive code to create empty strings.
>+        (concatenateAttributeAndValue): Changed to return a JSRetainPtr.
>+        (AccessibilityUIElement::identifier): Ditto.
>+        (AccessibilityUIElement::traits): Ditto.
>+        (AccessibilityUIElement::url): Ditto.
>+        (AccessibilityUIElement::speakAs): Ditto.
>+        (AccessibilityUIElement::stringForSelection): Ditto.
>+        (AccessibilityUIElement::stringForRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForElement): Ditto.
>+        (AccessibilityUIElement::pathDescription const): Ditto.
>+        (AccessibilityUIElement::stringForTextMarkerRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForTextMarkerRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions): Ditto.
>+        (AccessibilityUIElement::attributesOfLinkedUIElements): Ditto.
>+        (AccessibilityUIElement::attributesOfDocumentLinks): Ditto.
>+        (AccessibilityUIElement::attributesOfChildren): Ditto.
>+        (AccessibilityUIElement::allAttributes): Ditto.
>+        (AccessibilityUIElement::stringAttributeValue): Ditto.
>+        (AccessibilityUIElement::parameterizedAttributeNames): Ditto.
>+        (AccessibilityUIElement::role): Ditto.
>+        (AccessibilityUIElement::subrole): Ditto.
>+        (AccessibilityUIElement::roleDescription): Ditto.
>+        (AccessibilityUIElement::computedRoleString): Ditto.
>+        (AccessibilityUIElement::title): Ditto.
>+        (AccessibilityUIElement::description): Ditto.
>+        (AccessibilityUIElement::orientation const): Ditto.
>+        (AccessibilityUIElement::stringValue): Ditto.
>+        (AccessibilityUIElement::language): Ditto.
>+        (AccessibilityUIElement::helpText const): Ditto.
>+        (AccessibilityUIElement::valueDescription): Ditto.
>+        (AccessibilityUIElement::ariaDropEffects const): Ditto.
>+        (AccessibilityUIElement::boundsForRange): Ditto.
>+        (AccessibilityUIElement::attributesOfColumnHeaders): Ditto.
>+        (AccessibilityUIElement::attributesOfRowHeaders): Ditto.
>+        (AccessibilityUIElement::attributesOfColumns): Ditto.
>+        (AccessibilityUIElement::attributesOfRows): Ditto.
>+        (AccessibilityUIElement::attributesOfVisibleCells): Ditto.
>+        (AccessibilityUIElement::attributesOfHeader): Ditto.
>+        (AccessibilityUIElement::rowIndexRange): Ditto.
>+        (AccessibilityUIElement::columnIndexRange): Ditto.
>+        (AccessibilityUIElement::selectedTextRange): Ditto.
>+        (AccessibilityUIElement::accessibilityValue const): Ditto.
>+        (AccessibilityUIElement::documentEncoding): Ditto.
>+        (AccessibilityUIElement::documentURI): Ditto.
>+        (AccessibilityUIElement::selectTextWithCriteria): Ditto.
>+        (AccessibilityUIElement::classList const): Ditto.
>+
>+        * DumpRenderTree/mac/AccessibilityCommonMac.h: Changed the
>+        createJSStringRef method to return a JSRetainPtr.
>+        * DumpRenderTree/mac/AccessibilityCommonMac.mm:
>+        (-[NSString createJSStringRef]): Ditto.
>+        (searchPredicateParameterizedAttributeForSearchCriteria): Use the
>+        adopt function instead of the adopt constructor.
>+        * DumpRenderTree/mac/AccessibilityControllerMac.mm:
>+        (AccessibilityController::platformName const): Ditto.
>+
>+        * DumpRenderTree/mac/AccessibilityNotificationHandler.mm:
>+        (-[NSString createJSStringRef]): Return a JSRetainPtr.
>+        (makeValueRefForValue): Updated for the above, no adopt needed here now.
>+        (makeObjectRefForDictionary): Ditto.
>+        (-[AccessibilityNotificationHandler _notificationReceived:]): Ditto.
>+
>+        * DumpRenderTree/mac/AccessibilityUIElementMac.mm:
>+        (createEmptyJSString): Added. This helper function makes reduces the
>+        repetitive code to create empty strings.
>+        (concatenateAttributeAndValue): Changed to return a JSRetainPtr.
>+        (descriptionOfElements): Ditto.
>+        (selectTextParameterizedAttributeForCriteria): Ditto.
>+        (AccessibilityUIElement::attributesOfLinkedUIElements): Ditto.
>+        (AccessibilityUIElement::attributesOfDocumentLinks): Ditto.
>+        (AccessibilityUIElement::attributesOfChildren): Ditto.
>+        (AccessibilityUIElement::allAttributes): Ditto.
>+        (AccessibilityUIElement::stringAttributeValue): Ditto.
>+        (AccessibilityUIElement::parameterizedAttributeNames): Ditto.
>+        (AccessibilityUIElement::role): Ditto.
>+        (AccessibilityUIElement::subrole): Ditto.
>+        (AccessibilityUIElement::roleDescription): Ditto.
>+        (AccessibilityUIElement::computedRoleString): Ditto.
>+        (AccessibilityUIElement::title): Ditto.
>+        (AccessibilityUIElement::description): Ditto.
>+        (AccessibilityUIElement::orientation const): Ditto.
>+        (AccessibilityUIElement::stringValue): Ditto.
>+        (AccessibilityUIElement::language): Ditto.
>+        (AccessibilityUIElement::helpText const): Ditto.
>+        (AccessibilityUIElement::valueDescription): Ditto.
>+        (AccessibilityUIElement::speakAs): Ditto.
>+        (AccessibilityUIElement::classList const): Ditto.
>+        (AccessibilityUIElement::ariaDropEffects const): Ditto.
>+        (AccessibilityUIElement::rangeForLine): Ditto.
>+        (AccessibilityUIElement::rangeForPosition): Ditto.
>+        (AccessibilityUIElement::boundsForRange): Ditto.
>+        (AccessibilityUIElement::stringForRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForRange): Ditto.
>+        (AccessibilityUIElement::selectTextWithCriteria): Ditto.
>+        (AccessibilityUIElement::attributesOfColumnHeaders): Ditto.
>+        (AccessibilityUIElement::attributesOfRowHeaders): Ditto.
>+        (AccessibilityUIElement::attributesOfColumns): Ditto.
>+        (AccessibilityUIElement::attributesOfRows): Ditto.
>+        (AccessibilityUIElement::attributesOfVisibleCells): Ditto.
>+        (AccessibilityUIElement::attributesOfHeader): Ditto.
>+        (AccessibilityUIElement::rowIndexRange): Ditto.
>+        (AccessibilityUIElement::columnIndexRange): Ditto.
>+        (AccessibilityUIElement::pathDescription const): Ditto.
>+        (AccessibilityUIElement::selectedTextRange): Ditto.
>+        (AccessibilityUIElement::accessibilityValue const): Ditto.
>+        (AccessibilityUIElement::documentEncoding): Ditto.
>+        (AccessibilityUIElement::documentURI): Ditto.
>+        (AccessibilityUIElement::url): Ditto.
>+        (AccessibilityUIElement::stringForTextMarkerRange): Ditto.
>+        (createJSStringRef): Ditto.
>+        (AccessibilityUIElement::attributedStringForTextMarkerRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions): Ditto.
>+        (AccessibilityUIElement::supportedActions): Ditto.
>+        (AccessibilityUIElement::mathPostscriptsDescription const): Ditto.
>+        (AccessibilityUIElement::mathPrescriptsDescription const): Ditto.
>+
>+        * DumpRenderTree/mac/FrameLoadDelegate.mm:
>+        (-[FrameLoadDelegate didClearWindowObjectForFrame:inIsolatedWorld:]):
>+        Use the adopt function instead of the adopt constructor.
>+        * DumpRenderTree/mac/TestRunnerMac.mm:
>+        (originsArrayToJS): Ditto.
>+        (TestRunner::copyDecodedHostName): Return a JSRetainPtr.
>+        (TestRunner::copyEncodedHostName): Ditto.
>+        (TestRunner::pathToLocalResource): Ditto.
>+        (TestRunner::queueLoad): Use adopt function instead of constructor.
>+        (TestRunner::findString): Ditto.
>+        (TestRunner::inspectorTestStubURL): Return a JSRetainPtr.
>+
>+        * DumpRenderTree/win/AccessibilityControllerWin.cpp:
>+        (AccessibilityController::winNotificationReceived): Use adopt function
>+        instead of adopt constructor.
>+        (AccessibilityController::platformName const): Ditto.
>+
>+        * DumpRenderTree/win/AccessibilityUIElementWin.cpp:
>+        (createEmptyJSString): Added. This helper function makes reduces the
>+        repetitive code to create empty strings.
>+        (AccessibilityUIElement::allAttributes): Changed to return a JSRetainPtr.
>+        (AccessibilityUIElement::attributesOfLinkedUIElements): Ditto.
>+        (AccessibilityUIElement::attributesOfDocumentLinks): Ditto.
>+        (AccessibilityUIElement::attributesOfChildren): Ditto.
>+        (AccessibilityUIElement::parameterizedAttributeNames): Ditto.
>+        (AccessibilityUIElement::role): Ditto.
>+        (AccessibilityUIElement::subrole): Ditto.
>+        (AccessibilityUIElement::roleDescription): Ditto.
>+        (AccessibilityUIElement::computedRoleString): Ditto.
>+        (AccessibilityUIElement::title): Ditto.
>+        (AccessibilityUIElement::description): Ditto.
>+        (AccessibilityUIElement::stringValue): Ditto.
>+        (AccessibilityUIElement::language): Ditto.
>+        (AccessibilityUIElement::helpText const): Ditto.
>+        (AccessibilityUIElement::valueDescription): Ditto.
>+        (AccessibilityUIElement::ariaDropEffects const): Ditto.
>+        (AccessibilityUIElement::orientation const): Ditto.
>+        (AccessibilityUIElement::attributesOfColumnHeaders): Ditto.
>+        (AccessibilityUIElement::attributesOfRowHeaders): Ditto.
>+        (AccessibilityUIElement::attributesOfColumns): Ditto.
>+        (AccessibilityUIElement::attributesOfRows): Ditto.
>+        (AccessibilityUIElement::attributesOfVisibleCells): Ditto.
>+        (AccessibilityUIElement::attributesOfHeader): Ditto.
>+        (AccessibilityUIElement::rowIndexRange): Ditto.
>+        (AccessibilityUIElement::columnIndexRange): Ditto.
>+        (AccessibilityUIElement::boundsForRange): Ditto.
>+        (AccessibilityUIElement::stringForRange): Ditto.
>+        (AccessibilityUIElement::attributedStringForRange): Ditto.
>+        (AccessibilityUIElement::selectTextWithCriteria): Ditto.
>+        (AccessibilityUIElement::selectedTextRange): Ditto.
>+        (AccessibilityUIElement::stringAttributeValue): Ditto.
>+        (AccessibilityUIElement::accessibilityValue const): Ditto.
>+        (AccessibilityUIElement::documentEncoding): Ditto.
>+        (AccessibilityUIElement::documentURI): Ditto.
>+        (AccessibilityUIElement::url): Ditto.
>+        (AccessibilityUIElement::classList const): Ditto.
>+
>+        * DumpRenderTree/win/TestRunnerWin.cpp:
>+        (TestRunner::copyDecodedHostName): Changed to return a JSRetainPtr.
>+        (TestRunner::copyEncodedHostName): Ditto.
>+        (TestRunner::pathToLocalResource): Ditto.
>+        (TestRunner::queueLoad): Ditto.
>+        (TestRunner::findString): Ditto.
>+        (TestRunner::inspectorTestStubURL): Ditto.
>+
>+        * TestRunnerShared/Bindings/JSWrapper.h:
>+        (WTR::setProperty): Use adopt function instead of constructor.
>+        * TestRunnerShared/UIScriptContext/UIScriptContext.cpp:
>+        (UIScriptContext::UIScriptContext): Ditto.
>+        (UIScriptContext::runUIScript): Ditto.
>+        * TestRunnerShared/UIScriptContext/UIScriptController.cpp:
>+        (WTR::toDeviceOrientation): Ditto.
>+
>+        * TestRunnerShared/cocoa/LayoutTestSpellChecker.mm:
>+        (nsTextCheckingType): Changed this function to not take an rvalue
>+        reference to a JSRetainPtr since it doesn't take ownership.
>+        (-[LayoutTestSpellChecker setResultsFromJSObject:inContext:]): Updated
>+        for the above change.
>+
>+        * TestWebKitAPI/JavaScriptTest.cpp:
>+        (TestWebKitAPI::javaScriptCallback): Use adopt function instead of
>+        adopt member function.
>+
>+        * TestWebKitAPI/Tests/WebKit/WKPageIsPlayingAudio.cpp: Removed unneeded include.
>+        * TestWebKitAPI/Tests/WebKitCocoa/PictureInPictureDelegate.mm: Ditto.
>+        * TestWebKitAPI/Tests/mac/DOMNodeFromJSObject.mm: Use adopt function instead of
>+        adopt constructor.
>+        * TestWebKitAPI/Tests/mac/JSWrapperForNodeInWebFrame.mm: Ditto.
>+
>+        * WebKitTestRunner/InjectedBundle/AccessibilityController.cpp:
>+        Removed unneeded includes.
>+        * WebKitTestRunner/InjectedBundle/AccessibilityTextMarker.cpp: Ditto.
>+        * WebKitTestRunner/InjectedBundle/AccessibilityTextMarkerRange.cpp: Ditto.
>+        * WebKitTestRunner/InjectedBundle/AccessibilityUIElement.cpp: Ditto.
>+
>+        * WebKitTestRunner/InjectedBundle/Bindings/CodeGeneratorTestRunner.pm:
>+        (_platformTypeConstructor): Use the adopt function instead of the
>+        JSRetainPtr adopt constructor. Also nullptr instead of 0.
>+
>+        * WebKitTestRunner/InjectedBundle/EventSendingController.cpp:
>+        (WTR::arrayLength): Use adopt function instead of constructor.
>+        (WTR::parseModifierArray): Ditto.
>+        * WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp:
>+        (WTR::propertyValue): Ditto.
>+        (WTR::dumpPath): Ditto.
>+        (WTR::toJS): Ditto.
>+        * WebKitTestRunner/InjectedBundle/TestRunner.cpp:
>+        (WTR::TestRunner::findString): Ditto.
>+        (WTR::TestRunner::statisticsDidRunTelemetryCallback): Ditto.
>+        (WTR::TestRunner::callDidReceiveAllStorageAccessEntriesCallback): Ditto.
>+        (WTR::TestRunner::setOpenPanelFiles): Ditto.
>+        * WebKitTestRunner/InjectedBundle/ios/AccessibilityControllerIOS.mm:
>+        (WTR::AccessibilityController::platformName): Ditto.
>+
>+        * WebKitTestRunner/InjectedBundle/ios/AccessibilityUIElementIOS.mm:
>+        (-[NSString createJSStringRef]): Return a JSRetainPtr.
>+        This fixes storage leaks in many functions below, which were using
>+        the create function and putting the value right into a JSRetainPtr
>+        without adoption.
>+        (WTR::createEmptyJSString): Added. This helper function reduces the
>+        repetitive code to create empty strings.
>+        (WTR::concatenateAttributeAndValue): Return a JSRetainPtr.
>+        (WTR::AccessibilityUIElement::attributesOfLinkedUIElements):
>+        Use createEmptyJSString, fixing a storage leak due to missing adoption.
>+        (WTR::AccessibilityUIElement::attributesOfDocumentLinks): Ditto.
>+        (WTR::AccessibilityUIElement::attributesOfChildren): Ditto.
>+        (WTR::AccessibilityUIElement::allAttributes): Ditto.
>+        (WTR::AccessibilityUIElement::stringAttributeValue): Ditto.
>+        (WTR::AccessibilityUIElement::parameterizedAttributeNames): Ditto.
>+        (WTR::AccessibilityUIElement::role): Ditto.
>+        (WTR::AccessibilityUIElement::subrole): Ditto.
>+        (WTR::AccessibilityUIElement::roleDescription): Ditto.
>+        (WTR::AccessibilityUIElement::computedRoleString): Ditto.
>+        (WTR::AccessibilityUIElement::title): Ditto.
>+        (WTR::AccessibilityUIElement::orientation const): Ditto.
>+        (WTR::AccessibilityUIElement::language): Ditto.
>+        (WTR::AccessibilityUIElement::valueDescription): Ditto.
>+        (WTR::AccessibilityUIElement::ariaDropEffects const): Ditto.
>+        (WTR::AccessibilityUIElement::boundsForRange): Ditto.
>+        (WTR::AccessibilityUIElement::stringForRange): Removed unneeded null check.
>+        (WTR::AccessibilityUIElement::attributedStringForRange): Ditto.
>+        (WTR::AccessibilityUIElement::attributesOfColumnHeaders):
>+        Use createEmptyJSString, fixing a storage leak due to missing adoption.
>+        (WTR::AccessibilityUIElement::attributesOfRowHeaders): Ditto.
>+        (WTR::AccessibilityUIElement::attributesOfColumns): Ditto.
>+        (WTR::AccessibilityUIElement::attributesOfRows): Ditto.
>+        (WTR::AccessibilityUIElement::attributesOfVisibleCells): Ditto.
>+        (WTR::AccessibilityUIElement::attributesOfHeader): Ditto.
>+        (WTR::AccessibilityUIElement::selectedTextRange): Ditto.
>+        (WTR::AccessibilityUIElement::accessibilityValue const): Ditto.
>+        (WTR::AccessibilityUIElement::documentEncoding): Ditto.
>+        (WTR::AccessibilityUIElement::documentURI): Ditto.
>+        (WTR::AccessibilityUIElement::stringForSelection): Removed unneeded
>+        null check.
>+        (WTR::AccessibilityUIElement::stringForTextMarkerRange):
>+        Use createEmptyJSString, fixing a storage leak due to missing adoption.
>+
>+        * WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.h:
>+        Use JSRetainPtr for the return value of createJSStringRef.
>+        * WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.mm:
>+        (-[NSString createJSStringRef]): Ditto.
>+        (WTR::searchPredicateParameterizedAttributeForSearchCriteria): Use the
>+        adopt function instead of the adopt constructor.
>+        * WebKitTestRunner/InjectedBundle/mac/AccessibilityControllerMac.mm:
>+        (WTR::AccessibilityController::platformName): Ditto
>+
>+        * WebKitTestRunner/InjectedBundle/mac/AccessibilityNotificationHandler.mm:
>+        (-[NSString createJSStringRef]): Return a JSRetainPtr.
>+        (makeValueRefForValue): Updated for above by removing adopt.
>+        (makeObjectRefForDictionary): Ditto.
>+        (-[AccessibilityNotificationHandler _notificationReceived:]): Ditto.
>+
>+        * WebKitTestRunner/InjectedBundle/mac/AccessibilityUIElementMac.mm:
>+        (WTR::createEmptyJSString): Added. This helper function makes reduces the
>+        repetitive code to create empty strings.
>+        (WTR::concatenateAttributeAndValue): Return a JSRetainPtr.
>+        (WTR::descriptionOfElements): Ditto.
>+        (WTR::selectTextParameterizedAttributeForCriteria): Ditto.
>+        (WTR::AccessibilityUIElement::accessibilityValue const): Use createEmptyJSString,
>+        fixing a storage leak due to missing adoption.
>+        (WTR::AccessibilityUIElement::documentEncoding): Ditto.
>+        (WTR::AccessibilityUIElement::documentURI): Ditto.
>+        (WTR::createJSStringRef): Return a JSRetainPtr.
>+
>+        * WebKitTestRunner/StringFunctions.h:
>+        (WTR::toWK): Take a const& to eliminate a little bit of reference count churn.
>+        (WTR::toJS): Use the adopt function instead of the constructor.
>+
> 2018-09-14  Dean Jackson  <dino@grorg.org>
> 
>         Add Justin Michaud.
>diff --git a/Tools/DumpRenderTree/AccessibilityController.cpp b/Tools/DumpRenderTree/AccessibilityController.cpp
>index d035dea997bf8f1b74408c458f6b9ec94360c8b1..1a0c16706b2ae4260e32d290449bf2d65cfa3dfa 100644
>--- a/Tools/DumpRenderTree/AccessibilityController.cpp
>+++ b/Tools/DumpRenderTree/AccessibilityController.cpp
>@@ -30,7 +30,6 @@
> #include "AccessibilityController.h"
> 
> #include "AccessibilityUIElement.h"
>-#include <JavaScriptCore/JSRetainPtr.h>
> 
> // Static Value Getters
> 
>@@ -50,7 +49,7 @@ static JSValueRef getRootElementCallback(JSContextRef context, JSObjectRef thisO
> 
> void AccessibilityController::makeWindowObject(JSContextRef context, JSObjectRef windowObject, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> accessibilityControllerStr(Adopt, JSStringCreateWithUTF8CString("accessibilityController"));
>+    auto accessibilityControllerStr = adopt(JSStringCreateWithUTF8CString("accessibilityController"));
>     
>     JSClassRef classRef = getJSClass();
>     JSValueRef accessibilityControllerObject = JSObjectMake(context, classRef, this);
>diff --git a/Tools/DumpRenderTree/AccessibilityTextMarker.cpp b/Tools/DumpRenderTree/AccessibilityTextMarker.cpp
>index 12504978b0804b4566575a5173f4b96ee0b16fe5..e117d66f195a725cbeaf4f6580853715f9517ee6 100644
>--- a/Tools/DumpRenderTree/AccessibilityTextMarker.cpp
>+++ b/Tools/DumpRenderTree/AccessibilityTextMarker.cpp
>@@ -27,7 +27,6 @@
> #include "AccessibilityTextMarker.h"
> 
> #include "AccessibilityUIElement.h"
>-#include <JavaScriptCore/JSRetainPtr.h>
> 
> // MARK: AccessibilityTextMarker
> 
>diff --git a/Tools/DumpRenderTree/AccessibilityUIElement.cpp b/Tools/DumpRenderTree/AccessibilityUIElement.cpp
>index 0d8b1595ec3c549b28b9dbc64ff69ff72f57208d..872366f4c532379d653d7e173eb78f32c1998fc5 100644
>--- a/Tools/DumpRenderTree/AccessibilityUIElement.cpp
>+++ b/Tools/DumpRenderTree/AccessibilityUIElement.cpp
>@@ -30,7 +30,6 @@
> #include "AccessibilityUIElement.h"
> 
> #include <JavaScriptCore/JSObjectRef.h>
>-#include <JavaScriptCore/JSRetainPtr.h>
> #include <limits.h>
> 
> // Static Functions
>@@ -43,67 +42,67 @@ static inline AccessibilityUIElement* toAXElement(JSObjectRef object)
> 
> static JSValueRef allAttributesCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> attributes(Adopt, toAXElement(thisObject)->allAttributes());
>+    auto attributes = toAXElement(thisObject)->allAttributes();
>     return JSValueMakeString(context, attributes.get());
> }
> 
> static JSValueRef attributesOfLinkedUIElementsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> linkedUIDescription(Adopt, toAXElement(thisObject)->attributesOfLinkedUIElements());
>+    auto linkedUIDescription = toAXElement(thisObject)->attributesOfLinkedUIElements();
>     return JSValueMakeString(context, linkedUIDescription.get());
> }
> 
> static JSValueRef attributesOfDocumentLinksCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> linkedUIDescription(Adopt, toAXElement(thisObject)->attributesOfDocumentLinks());
>+    auto linkedUIDescription = toAXElement(thisObject)->attributesOfDocumentLinks();
>     return JSValueMakeString(context, linkedUIDescription.get());
> }
> 
> static JSValueRef attributesOfChildrenCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> childrenDescription(Adopt, toAXElement(thisObject)->attributesOfChildren());
>+    auto childrenDescription = toAXElement(thisObject)->attributesOfChildren();
>     return JSValueMakeString(context, childrenDescription.get());
> }
> 
> static JSValueRef parameterizedAttributeNamesCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> parameterizedAttributeNames(Adopt, toAXElement(thisObject)->parameterizedAttributeNames());
>+    auto parameterizedAttributeNames = toAXElement(thisObject)->parameterizedAttributeNames();
>     return JSValueMakeString(context, parameterizedAttributeNames.get());
> }
> 
> static JSValueRef attributesOfColumnHeadersCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> attributesOfColumnHeaders(Adopt, toAXElement(thisObject)->attributesOfColumnHeaders());
>+    auto attributesOfColumnHeaders = toAXElement(thisObject)->attributesOfColumnHeaders();
>     return JSValueMakeString(context, attributesOfColumnHeaders.get());
> }
> 
> static JSValueRef attributesOfRowHeadersCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> attributesOfRowHeaders(Adopt, toAXElement(thisObject)->attributesOfRowHeaders());
>+    auto attributesOfRowHeaders = toAXElement(thisObject)->attributesOfRowHeaders();
>     return JSValueMakeString(context, attributesOfRowHeaders.get());
> }
> 
> static JSValueRef attributesOfColumnsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> attributesOfColumns(Adopt, toAXElement(thisObject)->attributesOfColumns());
>+    auto attributesOfColumns = toAXElement(thisObject)->attributesOfColumns();
>     return JSValueMakeString(context, attributesOfColumns.get());
> }
> 
> static JSValueRef attributesOfRowsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> attributesOfRows(Adopt, toAXElement(thisObject)->attributesOfRows());
>+    auto attributesOfRows = toAXElement(thisObject)->attributesOfRows();
>     return JSValueMakeString(context, attributesOfRows.get());
> }
> 
> static JSValueRef attributesOfVisibleCellsCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> attributesOfVisibleCells(Adopt, toAXElement(thisObject)->attributesOfVisibleCells());
>+    auto attributesOfVisibleCells = toAXElement(thisObject)->attributesOfVisibleCells();
>     return JSValueMakeString(context, attributesOfVisibleCells.get());
> }
> 
> static JSValueRef attributesOfHeaderCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> attributesOfHeader(Adopt, toAXElement(thisObject)->attributesOfHeader());
>+    auto attributesOfHeader = toAXElement(thisObject)->attributesOfHeader();
>     return JSValueMakeString(context, attributesOfHeader.get());
> }
> 
>@@ -114,13 +113,13 @@ static JSValueRef indexInTableCallback(JSContextRef context, JSObjectRef functio
> 
> static JSValueRef rowIndexRangeCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> rowIndexRange(Adopt, toAXElement(thisObject)->rowIndexRange());
>+    auto rowIndexRange = toAXElement(thisObject)->rowIndexRange();
>     return JSValueMakeString(context, rowIndexRange.get());
> }
> 
> static JSValueRef columnIndexRangeCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> columnIndexRange(Adopt, toAXElement(thisObject)->columnIndexRange());
>+    auto columnIndexRange = toAXElement(thisObject)->columnIndexRange();
>     return JSValueMakeString(context, columnIndexRange.get());
> }
> 
>@@ -139,7 +138,7 @@ static JSValueRef rangeForLineCallback(JSContextRef context, JSObjectRef functio
>     if (argumentCount == 1)
>         indexNumber = JSValueToNumber(context, arguments[0], exception);
>     
>-    JSRetainPtr<JSStringRef> rangeLine(Adopt, toAXElement(thisObject)->rangeForLine(indexNumber));
>+    auto rangeLine = toAXElement(thisObject)->rangeForLine(indexNumber);
>     return JSValueMakeString(context, rangeLine.get());
> }
> 
>@@ -151,7 +150,7 @@ static JSValueRef boundsForRangeCallback(JSContextRef context, JSObjectRef funct
>         length = JSValueToNumber(context, arguments[1], exception);
>     }
> 
>-    JSRetainPtr<JSStringRef> boundsDescription(Adopt, toAXElement(thisObject)->boundsForRange(location, length));
>+    auto boundsDescription = toAXElement(thisObject)->boundsForRange(location, length);
>     return JSValueMakeString(context, boundsDescription.get());    
> }
> 
>@@ -163,7 +162,7 @@ static JSValueRef rangeForPositionCallback(JSContextRef context, JSObjectRef fun
>         y = JSValueToNumber(context, arguments[1], exception);
>     }
>     
>-    JSRetainPtr<JSStringRef> rangeDescription(Adopt, toAXElement(thisObject)->rangeForPosition(x, y));
>+    auto rangeDescription = toAXElement(thisObject)->rangeForPosition(x, y);
>     return JSValueMakeString(context, rangeDescription.get());    
> }
> 
>@@ -175,7 +174,7 @@ static JSValueRef stringForRangeCallback(JSContextRef context, JSObjectRef funct
>         length = JSValueToNumber(context, arguments[1], exception);
>     }
>     
>-    JSRetainPtr<JSStringRef> stringDescription(Adopt, toAXElement(thisObject)->stringForRange(location, length));
>+    auto stringDescription = toAXElement(thisObject)->stringForRange(location, length);
>     return JSValueMakeString(context, stringDescription.get());    
> }
> 
>@@ -187,7 +186,7 @@ static JSValueRef attributedStringForRangeCallback(JSContextRef context, JSObjec
>         length = JSValueToNumber(context, arguments[1], exception);
>     }
>     
>-    JSRetainPtr<JSStringRef> stringDescription(Adopt, toAXElement(thisObject)->attributedStringForRange(location, length));
>+    auto stringDescription = toAXElement(thisObject)->attributedStringForRange(location, length);
>     return JSValueMakeString(context, stringDescription.get());    
> }
> 
>@@ -219,7 +218,7 @@ static JSValueRef uiElementCountForSearchPredicateCallback(JSContextRef context,
>         searchKey = arguments[2];
>         
>         if (JSValueIsString(context, arguments[3]))
>-            searchText.adopt(JSValueToStringCopy(context, arguments[3], exception));
>+            searchText = adopt(JSValueToStringCopy(context, arguments[3], exception));
>         
>         visibleOnly = JSValueToBoolean(context, arguments[4]);
>         
>@@ -247,7 +246,7 @@ static JSValueRef uiElementForSearchPredicateCallback(JSContextRef context, JSOb
>         searchKey = arguments[2];
>         
>         if (JSValueIsString(context, arguments[3]))
>-            searchText.adopt(JSValueToStringCopy(context, arguments[3], exception));
>+            searchText = adopt(JSValueToStringCopy(context, arguments[3], exception));
>         
>         visibleOnly = JSValueToBoolean(context, arguments[4]);
>         
>@@ -263,7 +262,7 @@ static JSValueRef selectTextWithCriteriaCallback(JSContextRef context, JSObjectR
>     if (argumentCount < 2 || argumentCount > 4)
>         return JSValueMakeUndefined(context);
>     
>-    JSRetainPtr<JSStringRef> ambiguityResolution(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto ambiguityResolution = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     JSValueRef searchStrings = arguments[1];
>     JSStringRef replacementString = nullptr;
>     if (argumentCount == 3)
>@@ -272,7 +271,7 @@ static JSValueRef selectTextWithCriteriaCallback(JSContextRef context, JSObjectR
>     if (argumentCount == 4)
>         activityString = JSValueToStringCopy(context, arguments[3], exception);
>     
>-    JSRetainPtr<JSStringRef> result(Adopt, toAXElement(thisObject)->selectTextWithCriteria(context, ambiguityResolution.get(), searchStrings, replacementString, activityString));
>+    auto result = toAXElement(thisObject)->selectTextWithCriteria(context, ambiguityResolution.get(), searchStrings, replacementString, activityString);
>     if (replacementString)
>         JSStringRelease(replacementString);
>     if (activityString)
>@@ -371,7 +370,7 @@ static JSValueRef fieldsetAncestorElementCallback(JSContextRef context, JSObject
> 
> static JSValueRef attributedStringForElementCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> stringDescription(Adopt, toAXElement(thisObject)->attributedStringForElement());
>+    auto stringDescription = toAXElement(thisObject)->attributedStringForElement();
>     return JSValueMakeString(context, stringDescription.get());
> }
> 
>@@ -474,7 +473,7 @@ static JSValueRef setValueCallback(JSContextRef context, JSObjectRef function, J
>     JSRetainPtr<JSStringRef> valueText = 0;
>     if (argumentCount == 1) {
>         if (JSValueIsString(context, arguments[0]))
>-            valueText.adopt(JSValueToStringCopy(context, arguments[0], exception));
>+            valueText = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     }
>     
>     toAXElement(thisObject)->setValue(valueText.get());
>@@ -591,7 +590,7 @@ static JSValueRef stringAttributeValueCallback(JSContextRef context, JSObjectRef
>     JSStringRef attribute = 0;
>     if (argumentCount == 1)
>         attribute = JSValueToStringCopy(context, arguments[0], exception);
>-    JSRetainPtr<JSStringRef> stringAttributeValue(Adopt, toAXElement(thisObject)->stringAttributeValue(attribute));
>+    auto stringAttributeValue = toAXElement(thisObject)->stringAttributeValue(attribute);
>     JSValueRef result = JSValueMakeString(context, stringAttributeValue.get());
>     if (attribute)
>         JSStringRelease(attribute);
>@@ -629,7 +628,7 @@ static JSValueRef uiElementArrayAttributeValueCallback(JSContextRef context, JSO
>     if (argumentCount != 1)
>         return JSValueMakeUndefined(context);
>     
>-    JSRetainPtr<JSStringRef> attribute(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto attribute = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     
>     Vector<AccessibilityUIElement> elements;
>     toAXElement(thisObject)->uiElementArrayAttributeValue(attribute.get(), elements);
>@@ -640,7 +639,7 @@ static JSValueRef uiElementAttributeValueCallback(JSContextRef context, JSObject
> {
>     JSRetainPtr<JSStringRef> attribute;
>     if (argumentCount == 1)
>-        attribute.adopt(JSValueToStringCopy(context, arguments[0], exception));
>+        attribute = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     
>     return AccessibilityUIElement::makeJSAccessibilityUIElement(context, toAXElement(thisObject)->uiElementAttributeValue(attribute.get()));
> }
>@@ -883,7 +882,7 @@ static JSValueRef stringForTextMarkerRangeCallback(JSContextRef context, JSObjec
>     if (argumentCount == 1)
>         markerRange = toTextMarkerRange(JSValueToObject(context, arguments[0], exception));
>     
>-    JSRetainPtr<JSStringRef> markerRangeString(Adopt, toAXElement(thisObject)->stringForTextMarkerRange(markerRange));
>+    auto markerRangeString = toAXElement(thisObject)->stringForTextMarkerRange(markerRange);
>     return JSValueMakeString(context, markerRangeString.get());    
> }
> 
>@@ -893,7 +892,7 @@ static JSValueRef attributedStringForTextMarkerRangeCallback(JSContextRef contex
>     if (argumentCount == 1)
>         markerRange = toTextMarkerRange(JSValueToObject(context, arguments[0], exception));
> 
>-    JSRetainPtr<JSStringRef> markerRangeString(Adopt, toAXElement(thisObject)->attributedStringForTextMarkerRange(markerRange));
>+    auto markerRangeString = toAXElement(thisObject)->attributedStringForTextMarkerRange(markerRange);
>     return JSValueMakeString(context, markerRangeString.get());
> }
> 
>@@ -906,7 +905,7 @@ static JSValueRef attributedStringForTextMarkerRangeWithOptionsCallback(JSContex
>         includeSpellCheck = JSValueToBoolean(context, arguments[1]);
>     }
> 
>-    JSRetainPtr<JSStringRef> markerRangeString(Adopt, toAXElement(thisObject)->attributedStringForTextMarkerRangeWithOptions(markerRange, includeSpellCheck));
>+    auto markerRangeString = toAXElement(thisObject)->attributedStringForTextMarkerRangeWithOptions(markerRange, includeSpellCheck);
>     return JSValueMakeString(context, markerRangeString.get());
> }
> 
>@@ -1110,13 +1109,13 @@ static JSValueRef setSelectedVisibleTextRangeCallback(JSContextRef context, JSOb
> 
> static JSValueRef getARIADropEffectsCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> dropEffects(Adopt, toAXElement(thisObject)->ariaDropEffects());
>+    auto dropEffects = toAXElement(thisObject)->ariaDropEffects();
>     return JSValueMakeString(context, dropEffects.get());
> }
> 
> static JSValueRef getClassListCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> classList(Adopt, toAXElement(thisObject)->classList());
>+    auto classList = toAXElement(thisObject)->classList();
>     return JSValueMakeString(context, classList.get());
> }
> 
>@@ -1138,61 +1137,61 @@ static JSValueRef getIsValidCallback(JSContextRef context, JSObjectRef thisObjec
> 
> static JSValueRef getRoleCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> role(Adopt, toAXElement(thisObject)->role());
>+    auto role = toAXElement(thisObject)->role();
>     return JSValueMakeString(context, role.get());
> }
> 
> static JSValueRef getSubroleCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> role(Adopt, toAXElement(thisObject)->subrole());
>+    auto role = toAXElement(thisObject)->subrole();
>     return JSValueMakeString(context, role.get());
> }
> 
> static JSValueRef getRoleDescriptionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> roleDesc(Adopt, toAXElement(thisObject)->roleDescription());
>+    auto roleDesc = toAXElement(thisObject)->roleDescription();
>     return JSValueMakeString(context, roleDesc.get());
> }
> 
> static JSValueRef getComputedRoleStringCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> compRole(Adopt, toAXElement(thisObject)->computedRoleString());
>+    auto compRole = toAXElement(thisObject)->computedRoleString();
>     return JSValueMakeString(context, compRole.get());
> }
> 
> static JSValueRef getTitleCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> title(Adopt, toAXElement(thisObject)->title());
>+    auto title = toAXElement(thisObject)->title();
>     return JSValueMakeString(context, title.get());
> }
> 
> static JSValueRef getDescriptionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> description(Adopt, toAXElement(thisObject)->description());
>+    auto description = toAXElement(thisObject)->description();
>     return JSValueMakeString(context, description.get());
> }
> 
> static JSValueRef getStringValueCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> stringValue(Adopt, toAXElement(thisObject)->stringValue());
>+    auto stringValue = toAXElement(thisObject)->stringValue();
>     return JSValueMakeString(context, stringValue.get());
> }
> 
> static JSValueRef getLanguageCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> language(Adopt, toAXElement(thisObject)->language());
>+    auto language = toAXElement(thisObject)->language();
>     return JSValueMakeString(context, language.get());
> }
> 
> static JSValueRef getHelpTextCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> language(Adopt, toAXElement(thisObject)->helpText());
>+    auto language = toAXElement(thisObject)->helpText();
>     return JSValueMakeString(context, language.get());
> }
> 
> static JSValueRef getOrientationCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> orientation(Adopt, toAXElement(thisObject)->orientation());
>+    auto orientation = toAXElement(thisObject)->orientation();
>     return JSValueMakeString(context, orientation.get());
> }
> 
>@@ -1263,13 +1262,13 @@ static JSValueRef getInsertionPointLineNumberCallback(JSContextRef context, JSOb
> 
> static JSValueRef getPathDescriptionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> pathDescription(Adopt, toAXElement(thisObject)->pathDescription());
>+    auto pathDescription = toAXElement(thisObject)->pathDescription();
>     return JSValueMakeString(context, pathDescription.get());
> }
> 
> static JSValueRef getSelectedTextRangeCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> selectedTextRange(Adopt, toAXElement(thisObject)->selectedTextRange());
>+    auto selectedTextRange = toAXElement(thisObject)->selectedTextRange();
>     return JSValueMakeString(context, selectedTextRange.get());
> }
> 
>@@ -1350,7 +1349,7 @@ static JSValueRef isIgnoredCallback(JSContextRef context, JSObjectRef thisObject
> 
> static JSValueRef speakAsCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef, JSValueRef*)
> {
>-    JSRetainPtr<JSStringRef> speakAsString(Adopt, toAXElement(thisObject)->speakAs());
>+    auto speakAsString = toAXElement(thisObject)->speakAs();
>     return JSValueMakeString(context, speakAsString.get());
> }
> 
>@@ -1381,31 +1380,31 @@ static JSValueRef hierarchicalLevelCallback(JSContextRef context, JSObjectRef th
> 
> static JSValueRef getValueDescriptionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> valueDescription(Adopt, toAXElement(thisObject)->valueDescription());
>+    auto valueDescription = toAXElement(thisObject)->valueDescription();
>     return JSValueMakeString(context, valueDescription.get());
> }
> 
> static JSValueRef getAccessibilityValueCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> accessibilityValue(Adopt, toAXElement(thisObject)->accessibilityValue());
>+    auto accessibilityValue = toAXElement(thisObject)->accessibilityValue();
>     return JSValueMakeString(context, accessibilityValue.get());
> }
> 
> static JSValueRef getDocumentEncodingCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> documentEncoding(Adopt, toAXElement(thisObject)->documentEncoding());
>+    auto documentEncoding = toAXElement(thisObject)->documentEncoding();
>     return JSValueMakeString(context, documentEncoding.get());
> }
> 
> static JSValueRef getDocumentURICallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> documentURI(Adopt, toAXElement(thisObject)->documentURI());
>+    auto documentURI = toAXElement(thisObject)->documentURI();
>     return JSValueMakeString(context, documentURI.get());
> }
> 
> static JSValueRef getURLCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> url(Adopt, toAXElement(thisObject)->url());
>+    auto url = toAXElement(thisObject)->url();
>     return JSValueMakeString(context, url.get());
> }
> 
>@@ -1432,7 +1431,7 @@ static JSValueRef characterAtOffsetCallback(JSContextRef context, JSObjectRef fu
>     if (argumentCount == 1)
>         offset = JSValueToNumber(context, arguments[0], exception);
> 
>-    JSRetainPtr<JSStringRef> characterAtOffset(Adopt, toAXElement(thisObject)->characterAtOffset(offset));
>+    auto characterAtOffset = toAXElement(thisObject)->characterAtOffset(offset);
>     return JSValueMakeString(context, characterAtOffset.get());
> }
> 
>@@ -1442,7 +1441,7 @@ static JSValueRef wordAtOffsetCallback(JSContextRef context, JSObjectRef functio
>     if (argumentCount == 1)
>         offset = JSValueToNumber(context, arguments[0], exception);
> 
>-    JSRetainPtr<JSStringRef> wordAtOffset(Adopt, toAXElement(thisObject)->wordAtOffset(offset));
>+    auto wordAtOffset = toAXElement(thisObject)->wordAtOffset(offset);
>     return JSValueMakeString(context, wordAtOffset.get());
> }
> 
>@@ -1452,7 +1451,7 @@ static JSValueRef lineAtOffsetCallback(JSContextRef context, JSObjectRef functio
>     if (argumentCount == 1)
>         offset = JSValueToNumber(context, arguments[0], exception);
> 
>-    JSRetainPtr<JSStringRef> lineAtOffset(Adopt, toAXElement(thisObject)->lineAtOffset(offset));
>+    auto lineAtOffset = toAXElement(thisObject)->lineAtOffset(offset);
>     return JSValueMakeString(context, lineAtOffset.get());
> }
> 
>@@ -1462,7 +1461,7 @@ static JSValueRef sentenceAtOffsetCallback(JSContextRef context, JSObjectRef fun
>     if (argumentCount == 1)
>         offset = JSValueToNumber(context, arguments[0], exception);
> 
>-    JSRetainPtr<JSStringRef> sentenceAtOffset(Adopt, toAXElement(thisObject)->sentenceAtOffset(offset));
>+    auto sentenceAtOffset = toAXElement(thisObject)->sentenceAtOffset(offset);
>     return JSValueMakeString(context, sentenceAtOffset.get());
> }
> 
>@@ -1480,20 +1479,20 @@ static JSValueRef getIsTextAreaCallback(JSContextRef context, JSObjectRef thisOb
> 
> static JSValueRef stringForSelectionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> labelString(Adopt, toAXElement(thisObject)->stringForSelection());
>+    auto labelString = toAXElement(thisObject)->stringForSelection();
>     return JSValueMakeString(context, labelString.get());
> }
> 
> static JSValueRef getIdentifierCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> valueString(Adopt, toAXElement(thisObject)->identifier());
>+    auto valueString = toAXElement(thisObject)->identifier();
>     return JSValueMakeString(context, valueString.get());
> }
> 
> 
> static JSValueRef getTraitsCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> valueString(Adopt, toAXElement(thisObject)->traits());
>+    auto valueString = toAXElement(thisObject)->traits();
>     return JSValueMakeString(context, valueString.get());
> }
> 
>@@ -1534,19 +1533,19 @@ static JSValueRef textMarkerRangeMatchesTextNearMarkersCallback(JSContextRef con
> #if PLATFORM(MAC) && !PLATFORM(IOS)
> static JSValueRef supportedActionsCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> valueString(Adopt, toAXElement(thisObject)->supportedActions());
>+    auto valueString = toAXElement(thisObject)->supportedActions();
>     return JSValueMakeString(context, valueString.get());
> }
> 
> static JSValueRef mathPostscriptsDescriptionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> valueString(Adopt, toAXElement(thisObject)->mathPostscriptsDescription());
>+    auto valueString = toAXElement(thisObject)->mathPostscriptsDescription();
>     return JSValueMakeString(context, valueString.get());
> }
> 
> static JSValueRef mathPrescriptsDescriptionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> valueString(Adopt, toAXElement(thisObject)->mathPrescriptsDescription());
>+    auto valueString = toAXElement(thisObject)->mathPrescriptsDescription();
>     return JSValueMakeString(context, valueString.get());
> }
> 
>@@ -1556,8 +1555,8 @@ static JSValueRef mathPrescriptsDescriptionCallback(JSContextRef context, JSObje
> 
> // Unsupported methods on various platforms.
> #if !PLATFORM(MAC) || PLATFORM(IOS)
>-JSStringRef AccessibilityUIElement::rangeForLine(int line) { return 0; }
>-JSStringRef AccessibilityUIElement::rangeForPosition(int, int) { return 0; }
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::rangeForLine(int line) { return 0; }
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::rangeForPosition(int, int) { return 0; }
> void AccessibilityUIElement::setSelectedChild(AccessibilityUIElement*) const { }
> void AccessibilityUIElement::setSelectedChildAtIndex(unsigned) const { }
> void AccessibilityUIElement::removeSelectionAtIndex(unsigned) const { }
>@@ -1567,8 +1566,8 @@ AccessibilityUIElement AccessibilityUIElement::uiElementAttributeValue(JSStringR
> #endif
> 
> #if !PLATFORM(MAC) && !PLATFORM(IOS)
>-JSStringRef AccessibilityUIElement::speakAs() { return nullptr; }
>-JSStringRef AccessibilityUIElement::pathDescription() const { return 0; }
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::speakAs() { return nullptr; }
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::pathDescription() const { return 0; }
> void AccessibilityUIElement::setValue(JSStringRef) { }
> #endif
> 
>@@ -1660,17 +1659,17 @@ AccessibilityTextMarker AccessibilityUIElement::nextTextMarker(AccessibilityText
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::stringForTextMarkerRange(AccessibilityTextMarkerRange*)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForTextMarkerRange(AccessibilityTextMarkerRange*)
> {
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForTextMarkerRange(AccessibilityTextMarkerRange*)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForTextMarkerRange(AccessibilityTextMarkerRange*)
> {
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange*, bool includeSpellCheck)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange*, bool includeSpellCheck)
> {
>     return nullptr;
> }
>diff --git a/Tools/DumpRenderTree/AccessibilityUIElement.h b/Tools/DumpRenderTree/AccessibilityUIElement.h
>index 634ce8a8e411a0989f6820406f12f9659031bbef..3457811f56a513feef01d8280d76274a9b6544f1 100644
>--- a/Tools/DumpRenderTree/AccessibilityUIElement.h
>+++ b/Tools/DumpRenderTree/AccessibilityUIElement.h
>@@ -23,11 +23,11 @@
>  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
>  */
> 
>-#ifndef AccessibilityUIElement_h
>-#define AccessibilityUIElement_h
>+#pragma once
> 
> #include "AccessibilityTextMarker.h"
> #include <JavaScriptCore/JSObjectRef.h>
>+#include <JavaScriptCore/JSRetainPtr.h>
> #include <wtf/Platform.h>
> #include <wtf/Vector.h>
> 
>@@ -91,20 +91,20 @@ public:
>     void removeSelection();
> 
>     // Methods - platform-independent implementations
>-    JSStringRef allAttributes();
>-    JSStringRef attributesOfLinkedUIElements();
>+    JSRetainPtr<JSStringRef> allAttributes();
>+    JSRetainPtr<JSStringRef> attributesOfLinkedUIElements();
>     AccessibilityUIElement linkedUIElementAtIndex(unsigned);
>     
>-    JSStringRef attributesOfDocumentLinks();
>-    JSStringRef attributesOfChildren();
>-    JSStringRef parameterizedAttributeNames();
>+    JSRetainPtr<JSStringRef> attributesOfDocumentLinks();
>+    JSRetainPtr<JSStringRef> attributesOfChildren();
>+    JSRetainPtr<JSStringRef> parameterizedAttributeNames();
>     void increment();
>     void decrement();
>     void showMenu();
>     void press();
> 
>     // Attributes - platform-independent implementations
>-    JSStringRef stringAttributeValue(JSStringRef attribute);
>+    JSRetainPtr<JSStringRef> stringAttributeValue(JSStringRef attribute);
>     double numberAttributeValue(JSStringRef attribute);
>     void uiElementArrayAttributeValue(JSStringRef attribute, Vector<AccessibilityUIElement>& elements) const;
>     AccessibilityUIElement uiElementAttributeValue(JSStringRef attribute) const;    
>@@ -115,18 +115,18 @@ public:
>     bool isPressActionSupported();
>     bool isIncrementActionSupported();
>     bool isDecrementActionSupported();
>-    JSStringRef role();
>-    JSStringRef subrole();
>-    JSStringRef roleDescription();
>-    JSStringRef computedRoleString();
>-    JSStringRef title();
>-    JSStringRef description();
>-    JSStringRef language();
>-    JSStringRef stringValue();
>-    JSStringRef accessibilityValue() const;
>+    JSRetainPtr<JSStringRef> role();
>+    JSRetainPtr<JSStringRef> subrole();
>+    JSRetainPtr<JSStringRef> roleDescription();
>+    JSRetainPtr<JSStringRef> computedRoleString();
>+    JSRetainPtr<JSStringRef> title();
>+    JSRetainPtr<JSStringRef> description();
>+    JSRetainPtr<JSStringRef> language();
>+    JSRetainPtr<JSStringRef> stringValue();
>+    JSRetainPtr<JSStringRef> accessibilityValue() const;
>     void setValue(JSStringRef);
>-    JSStringRef helpText() const;
>-    JSStringRef orientation() const;
>+    JSRetainPtr<JSStringRef> helpText() const;
>+    JSRetainPtr<JSStringRef> orientation() const;
>     double x();
>     double y();
>     double width();
>@@ -134,10 +134,10 @@ public:
>     double intValue() const;
>     double minValue();
>     double maxValue();
>-    JSStringRef pathDescription() const;
>-    JSStringRef valueDescription();
>+    JSRetainPtr<JSStringRef> pathDescription() const;
>+    JSRetainPtr<JSStringRef> valueDescription();
>     int insertionPointLineNumber();
>-    JSStringRef selectedTextRange();
>+    JSRetainPtr<JSStringRef> selectedTextRange();
>     bool isEnabled();
>     bool isRequired() const;
>     
>@@ -167,24 +167,24 @@ public:
>     int hierarchicalLevel() const;
>     double clickPointX();
>     double clickPointY();
>-    JSStringRef documentEncoding();
>-    JSStringRef documentURI();
>-    JSStringRef url();
>-    JSStringRef classList() const;
>+    JSRetainPtr<JSStringRef> documentEncoding();
>+    JSRetainPtr<JSStringRef> documentURI();
>+    JSRetainPtr<JSStringRef> url();
>+    JSRetainPtr<JSStringRef> classList() const;
> 
>     // CSS3-speech properties.
>-    JSStringRef speakAs();
>+    JSRetainPtr<JSStringRef> speakAs();
>     
>     // Table-specific attributes
>-    JSStringRef attributesOfColumnHeaders();
>-    JSStringRef attributesOfRowHeaders();
>-    JSStringRef attributesOfColumns();
>-    JSStringRef attributesOfRows();
>-    JSStringRef attributesOfVisibleCells();
>-    JSStringRef attributesOfHeader();
>+    JSRetainPtr<JSStringRef> attributesOfColumnHeaders();
>+    JSRetainPtr<JSStringRef> attributesOfRowHeaders();
>+    JSRetainPtr<JSStringRef> attributesOfColumns();
>+    JSRetainPtr<JSStringRef> attributesOfRows();
>+    JSRetainPtr<JSStringRef> attributesOfVisibleCells();
>+    JSRetainPtr<JSStringRef> attributesOfHeader();
>     int indexInTable();
>-    JSStringRef rowIndexRange();
>-    JSStringRef columnIndexRange();
>+    JSRetainPtr<JSStringRef> rowIndexRange();
>+    JSRetainPtr<JSStringRef> columnIndexRange();
>     int rowCount();
>     int columnCount();
>     void rowHeaders(Vector<AccessibilityUIElement>& elements) const;
>@@ -204,23 +204,23 @@ public:
>     // ARIA Drag and Drop
>     bool ariaIsGrabbed() const;
>     // A space concatentated string of all the drop effects.
>-    JSStringRef ariaDropEffects() const;
>+    JSRetainPtr<JSStringRef> ariaDropEffects() const;
>     
>     // Parameterized attributes
>     int lineForIndex(int);
>-    JSStringRef rangeForLine(int);
>-    JSStringRef rangeForPosition(int x, int y);
>-    JSStringRef boundsForRange(unsigned location, unsigned length);
>+    JSRetainPtr<JSStringRef> rangeForLine(int);
>+    JSRetainPtr<JSStringRef> rangeForPosition(int x, int y);
>+    JSRetainPtr<JSStringRef> boundsForRange(unsigned location, unsigned length);
>     void setSelectedTextRange(unsigned location, unsigned length);
>-    JSStringRef stringForRange(unsigned location, unsigned length);
>-    JSStringRef attributedStringForRange(unsigned location, unsigned length);
>+    JSRetainPtr<JSStringRef> stringForRange(unsigned location, unsigned length);
>+    JSRetainPtr<JSStringRef> attributedStringForRange(unsigned location, unsigned length);
>     bool attributedStringRangeIsMisspelled(unsigned location, unsigned length);
>     unsigned uiElementCountForSearchPredicate(JSContextRef, AccessibilityUIElement* startElement, bool isDirectionNext, JSValueRef searchKey, JSStringRef searchText, bool visibleOnly, bool immediateDescendantsOnly);
>     AccessibilityUIElement uiElementForSearchPredicate(JSContextRef, AccessibilityUIElement* startElement, bool isDirectionNext, JSValueRef searchKey, JSStringRef searchText, bool visibleOnly, bool immediateDescendantsOnly);
>-    JSStringRef selectTextWithCriteria(JSContextRef, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity);
>+    JSRetainPtr<JSStringRef> selectTextWithCriteria(JSContextRef, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity);
> #if PLATFORM(IOS)
>     void elementsForRange(unsigned location, unsigned length, Vector<AccessibilityUIElement>& elements);
>-    JSStringRef stringForSelection();
>+    JSRetainPtr<JSStringRef> stringForSelection();
>     void increaseTextSelection();
>     void decreaseTextSelection();
>     AccessibilityUIElement linkedElement();
>@@ -232,15 +232,15 @@ public:
>     
>     bool hasContainedByFieldsetTrait();
>     AccessibilityUIElement fieldsetAncestorElement();
>-    JSStringRef attributedStringForElement();
>+    JSRetainPtr<JSStringRef> attributedStringForElement();
> #endif
> 
> #if PLATFORM(GTK)
>     // Text-specific
>-    JSStringRef characterAtOffset(int offset);
>-    JSStringRef wordAtOffset(int offset);
>-    JSStringRef lineAtOffset(int offset);
>-    JSStringRef sentenceAtOffset(int offset);
>+    JSRetainPtr<JSStringRef> characterAtOffset(int offset);
>+    JSRetainPtr<JSStringRef> wordAtOffset(int offset);
>+    JSRetainPtr<JSStringRef> lineAtOffset(int offset);
>+    JSRetainPtr<JSStringRef> sentenceAtOffset(int offset);
> #endif
> 
>     // Table-specific
>@@ -278,9 +278,9 @@ public:
>     void resetSelectedTextMarkerRange();
>     bool setSelectedVisibleTextRange(AccessibilityTextMarkerRange*);
>     
>-    JSStringRef stringForTextMarkerRange(AccessibilityTextMarkerRange*);
>-    JSStringRef attributedStringForTextMarkerRange(AccessibilityTextMarkerRange*);
>-    JSStringRef attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange*, bool includeSpellCheck);
>+    JSRetainPtr<JSStringRef> stringForTextMarkerRange(AccessibilityTextMarkerRange*);
>+    JSRetainPtr<JSStringRef> attributedStringForTextMarkerRange(AccessibilityTextMarkerRange*);
>+    JSRetainPtr<JSStringRef> attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange*, bool includeSpellCheck);
>     int textMarkerRangeLength(AccessibilityTextMarkerRange*);
>     bool attributedStringForTextMarkerRangeContainsAttribute(JSStringRef, AccessibilityTextMarkerRange*);
>     int indexForTextMarker(AccessibilityTextMarker*);
>@@ -298,8 +298,8 @@ public:
>     void removeNotificationListener();
>     
> #if PLATFORM(IOS)
>-    JSStringRef traits();
>-    JSStringRef identifier();
>+    JSRetainPtr<JSStringRef> traits();
>+    JSRetainPtr<JSStringRef> identifier();
>     int elementTextPosition();
>     int elementTextLength();
>     AccessibilityUIElement headerElementAtIndex(unsigned);
>@@ -315,11 +315,11 @@ public:
> 
> #if PLATFORM(MAC) && !PLATFORM(IOS)
>     // Returns an ordered list of supported actions for an element.
>-    JSStringRef supportedActions();
>+    JSRetainPtr<JSStringRef> supportedActions();
>     
>     // A general description of the elements making up multiscript pre/post objects.
>-    JSStringRef mathPostscriptsDescription() const;
>-    JSStringRef mathPrescriptsDescription() const;
>+    JSRetainPtr<JSStringRef> mathPostscriptsDescription() const;
>+    JSRetainPtr<JSStringRef> mathPrescriptsDescription() const;
> #endif
>     
> private:
>@@ -335,5 +335,3 @@ private:
>     RefPtr<AccessibilityNotificationHandler> m_notificationHandler;
> #endif
> };
>-
>-#endif // AccessibilityUIElement_h
>diff --git a/Tools/DumpRenderTree/Bindings/CodeGeneratorDumpRenderTree.pm b/Tools/DumpRenderTree/Bindings/CodeGeneratorDumpRenderTree.pm
>index b2c786c67d9a1ef3bc22fa0d40907d8ba5095d5d..c3152db14e63d4f6a85ad51910999165c27a9f42 100644
>--- a/Tools/DumpRenderTree/Bindings/CodeGeneratorDumpRenderTree.pm
>+++ b/Tools/DumpRenderTree/Bindings/CodeGeneratorDumpRenderTree.pm
>@@ -434,8 +434,8 @@ sub _platformTypeConstructor
>     return "JSValueToNullableBoolean(context, $argumentName)" if $type->name eq "boolean" && $type->isNullable;
>     return "JSValueToBoolean(context, $argumentName)" if $type->name eq "boolean";
>     return "$argumentName" if $type->name eq "object";
>-    return "JSRetainPtr<JSStringRef>(Adopt, JSValueToStringCopy(context, $argumentName, 0))" if $$self{codeGenerator}->IsStringType($type);
>-    return "JSValueToNumber(context, $argumentName, 0)" if $$self{codeGenerator}->IsPrimitiveType($type);
>+    return "adopt(JSValueToStringCopy(context, $argumentName, nullptr))" if $$self{codeGenerator}->IsStringType($type);
>+    return "JSValueToNumber(context, $argumentName, nullptr)" if $$self{codeGenerator}->IsPrimitiveType($type);
>     return "to" . _implementationClassName($type) . "(context, $argumentName)";
> }
> 
>diff --git a/Tools/DumpRenderTree/GCController.cpp b/Tools/DumpRenderTree/GCController.cpp
>index 781a828ebd050bb0ae91f693166825eb9fef23f9..4a37bf3a13da4caeea40a0cf8a709fe58d34ea4c 100644
>--- a/Tools/DumpRenderTree/GCController.cpp
>+++ b/Tools/DumpRenderTree/GCController.cpp
>@@ -73,7 +73,7 @@ static JSValueRef getJSObjectCountCallback(JSContextRef context, JSObjectRef fun
> 
> void GCController::makeWindowObject(JSContextRef context, JSObjectRef windowObject, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> gcControllerStr(Adopt, JSStringCreateWithUTF8CString("GCController"));
>+    auto gcControllerStr = adopt(JSStringCreateWithUTF8CString("GCController"));
> 
>     JSClassRef classRef = getJSClass();
>     JSValueRef gcControllerObject = JSObjectMake(context, classRef, this);
>diff --git a/Tools/DumpRenderTree/TestRunner.cpp b/Tools/DumpRenderTree/TestRunner.cpp
>index a5c0d809dc30b611cb4332fb690e6ed3ea8c3ba9..24a0c66b96a3606a7d90eed5fb8549fbd9d47ab3 100644
>--- a/Tools/DumpRenderTree/TestRunner.cpp
>+++ b/Tools/DumpRenderTree/TestRunner.cpp
>@@ -289,10 +289,10 @@ static JSValueRef pathToLocalResourceCallback(JSContextRef context, JSObjectRef
>         return JSValueMakeUndefined(context);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>-    JSRetainPtr<JSStringRef> localPath(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto localPath = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>-    JSRetainPtr<JSStringRef> convertedPath(Adopt, controller->pathToLocalResource(context, localPath.get()));
>+    auto convertedPath = controller->pathToLocalResource(context, localPath.get());
>     if (!convertedPath)
>         return JSValueMakeUndefined(context);
> 
>@@ -383,7 +383,7 @@ static JSValueRef addDisallowedURLCallback(JSContextRef context, JSObjectRef fun
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> url(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto url = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -397,10 +397,10 @@ static JSValueRef addURLToRedirectCallback(JSContextRef context, JSObjectRef fun
>     if (argumentCount < 2)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> origin(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto origin = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>-    JSRetainPtr<JSStringRef> destination(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto destination = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
> 
>     size_t maxLength = JSStringGetMaximumUTF8CStringSize(origin.get());
>@@ -439,7 +439,7 @@ static JSValueRef clearApplicationCacheForOriginCallback(JSContextRef context, J
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> originURL(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto originURL = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -453,7 +453,7 @@ static JSValueRef applicationCacheDiskUsageForOriginCallback(JSContextRef contex
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> originURL(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto originURL = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>     
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -500,11 +500,11 @@ static JSValueRef decodeHostNameCallback(JSContextRef context, JSObjectRef funct
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> name(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto name = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>-    JSRetainPtr<JSStringRef> decodedHostName(Adopt, controller->copyDecodedHostName(name.get()));
>+    auto decodedHostName = controller->copyDecodedHostName(name.get());
>     return JSValueMakeString(context, decodedHostName.get());
> }
> 
>@@ -541,11 +541,11 @@ static JSValueRef encodeHostNameCallback(JSContextRef context, JSObjectRef funct
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> name(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto name = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>-    JSRetainPtr<JSStringRef> encodedHostName(Adopt, controller->copyEncodedHostName(name.get()));
>+    auto encodedHostName = controller->copyEncodedHostName(name.get());
>     return JSValueMakeString(context, encodedHostName.get());
> }
> 
>@@ -555,17 +555,17 @@ static JSValueRef execCommandCallback(JSContextRef context, JSObjectRef function
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> name(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto name = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     // Ignoring the second parameter (userInterface), as this command emulates a manual action.
> 
>     JSRetainPtr<JSStringRef> value;
>     if (argumentCount >= 3) {
>-        value.adopt(JSValueToStringCopy(context, arguments[2], exception));
>+        value = adopt(JSValueToStringCopy(context, arguments[2], exception));
>         ASSERT(!*exception);
>     } else
>-        value.adopt(JSStringCreateWithUTF8CString(""));
>+        value = adopt(JSStringCreateWithUTF8CString(""));
> 
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -580,7 +580,7 @@ static JSValueRef findStringCallback(JSContextRef context, JSObjectRef function,
>     if (argumentCount < 2)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> target(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto target = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     JSObjectRef options = JSValueToObject(context, arguments[1], exception);
>@@ -605,7 +605,7 @@ static JSValueRef isCommandEnabledCallback(JSContextRef context, JSObjectRef fun
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> name(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto name = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -618,9 +618,9 @@ static JSValueRef overridePreferenceCallback(JSContextRef context, JSObjectRef f
>     if (argumentCount < 2)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> key(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto key = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> value(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto value = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -698,15 +698,15 @@ static JSValueRef queueLoadCallback(JSContextRef context, JSObjectRef function,
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> url(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto url = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     JSRetainPtr<JSStringRef> target;
>     if (argumentCount >= 2) {
>-        target.adopt(JSValueToStringCopy(context, arguments[1], exception));
>+        target = adopt(JSValueToStringCopy(context, arguments[1], exception));
>         ASSERT(!*exception);
>     } else
>-        target.adopt(JSStringCreateWithUTF8CString(""));
>+        target = adopt(JSStringCreateWithUTF8CString(""));
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>     controller->queueLoad(url.get(), target.get());
>@@ -720,21 +720,20 @@ static JSValueRef queueLoadHTMLStringCallback(JSContextRef context, JSObjectRef
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> content(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto content = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     JSRetainPtr<JSStringRef> baseURL;
>     if (argumentCount >= 2) {
>-        baseURL.adopt(JSValueToStringCopy(context, arguments[1], exception));
>+        baseURL = adopt(JSValueToStringCopy(context, arguments[1], exception));
>         ASSERT(!*exception);
>     } else
>-        baseURL.adopt(JSStringCreateWithUTF8CString(""));
>+        baseURL = adopt(JSStringCreateWithUTF8CString(""));
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
> 
>     if (argumentCount >= 3) {
>-        JSRetainPtr<JSStringRef> unreachableURL;
>-        unreachableURL.adopt(JSValueToStringCopy(context, arguments[2], exception));
>+        auto unreachableURL = adopt(JSValueToStringCopy(context, arguments[2], exception));
>         ASSERT(!*exception);
>         controller->queueLoadAlternateHTMLString(content.get(), baseURL.get(), unreachableURL.get());
>         return JSValueMakeUndefined(context);
>@@ -762,7 +761,7 @@ static JSValueRef queueLoadingScriptCallback(JSContextRef context, JSObjectRef f
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> script(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto script = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -778,7 +777,7 @@ static JSValueRef queueNonLoadingScriptCallback(JSContextRef context, JSObjectRe
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> script(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto script = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -832,7 +831,7 @@ static JSValueRef setAuthenticationPasswordCallback(JSContextRef context, JSObje
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> password(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto password = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     size_t maxLength = JSStringGetMaximumUTF8CStringSize(password.get());
>@@ -852,7 +851,7 @@ static JSValueRef setAuthenticationUsernameCallback(JSContextRef context, JSObje
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> username(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto username = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     size_t maxLength = JSStringGetMaximumUTF8CStringSize(username.get());
>@@ -955,7 +954,7 @@ static JSValueRef setDomainRelaxationForbiddenForURLSchemeCallback(JSContextRef
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
> 
>     bool forbidden = JSValueToBoolean(context, arguments[0]);
>-    JSRetainPtr<JSStringRef> scheme(Adopt, JSValueToStringCopy(context, arguments[1], 0));
>+    auto scheme = adopt(JSValueToStringCopy(context, arguments[1], 0));
>     controller->setDomainRelaxationForbiddenForURLScheme(forbidden, scheme.get());
> 
>     return JSValueMakeUndefined(context);
>@@ -1037,7 +1036,7 @@ static JSValueRef setMockGeolocationPositionUnavailableErrorCallback(JSContextRe
>     if (argumentCount != 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> message(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto message = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = reinterpret_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -1100,7 +1099,7 @@ static JSValueRef setPOSIXLocaleCallback(JSContextRef context, JSObjectRef funct
>         return JSValueMakeUndefined(context);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>-    JSRetainPtr<JSStringRef> locale(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto locale = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>     controller->setPOSIXLocale(locale.get());
> 
>@@ -1137,7 +1136,7 @@ static JSValueRef setPersistentUserStyleSheetLocationCallback(JSContextRef conte
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> path(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto path = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -1313,7 +1312,7 @@ static JSValueRef setUserStyleSheetLocationCallback(JSContextRef context, JSObje
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> path(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto path = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -1328,7 +1327,7 @@ static JSValueRef setValueForUserCallback(JSContextRef context, JSObjectRef func
>     if (argumentCount != 2)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> value(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto value = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -1343,7 +1342,7 @@ static JSValueRef setWillSendRequestClearHeaderCallback(JSContextRef context, JS
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> header(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto header = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     size_t maxLength = JSStringGetMaximumUTF8CStringSize(header.get());
>@@ -1455,7 +1454,7 @@ static JSValueRef setPageVisibilityCallback(JSContextRef context, JSObjectRef fu
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> visibility(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto visibility = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     size_t maxLength = JSStringGetMaximumUTF8CStringSize(visibility.get());
>@@ -1510,7 +1509,7 @@ static JSValueRef closeWebInspectorCallback(JSContextRef context, JSObjectRef fu
> static JSValueRef evaluateInWebInspectorCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>-    JSRetainPtr<JSStringRef> script(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto script = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     controller->evaluateInWebInspector(script.get());
>@@ -1522,7 +1521,7 @@ static JSValueRef evaluateScriptInIsolatedWorldCallback(JSContextRef context, JS
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>     double worldID = JSValueToNumber(context, arguments[0], exception);
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> script(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto script = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
> 
>     controller->evaluateScriptInIsolatedWorld(static_cast<unsigned>(worldID), JSContextGetGlobalObject(context), script.get());
>@@ -1534,7 +1533,7 @@ static JSValueRef evaluateScriptInIsolatedWorldAndReturnValueCallback(JSContextR
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>     double worldID = JSValueToNumber(context, arguments[0], exception);
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> script(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto script = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
> 
>     controller->evaluateScriptInIsolatedWorldAndReturnValue(static_cast<unsigned>(worldID), JSContextGetGlobalObject(context), script.get());
>@@ -1553,11 +1552,11 @@ static JSValueRef addOriginAccessWhitelistEntryCallback(JSContextRef context, JS
>     if (argumentCount != 4)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> sourceOrigin(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto sourceOrigin = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> destinationProtocol(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto destinationProtocol = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> destinationHost(Adopt, JSValueToStringCopy(context, arguments[2], exception));
>+    auto destinationHost = adopt(JSValueToStringCopy(context, arguments[2], exception));
>     ASSERT(!*exception);
>     bool allowDestinationSubdomains = JSValueToBoolean(context, arguments[3]);
> 
>@@ -1571,11 +1570,11 @@ static JSValueRef removeOriginAccessWhitelistEntryCallback(JSContextRef context,
>     if (argumentCount != 4)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> sourceOrigin(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto sourceOrigin = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> destinationProtocol(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto destinationProtocol = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> destinationHost(Adopt, JSValueToStringCopy(context, arguments[2], exception));
>+    auto destinationHost = adopt(JSValueToStringCopy(context, arguments[2], exception));
>     ASSERT(!*exception);
>     bool allowDestinationSubdomains = JSValueToBoolean(context, arguments[3]);
> 
>@@ -1589,9 +1588,9 @@ static JSValueRef setScrollbarPolicyCallback(JSContextRef context, JSObjectRef,
>     if (argumentCount != 2)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> orientation(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto orientation = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> policy(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto policy = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -1604,7 +1603,7 @@ static JSValueRef addUserScriptCallback(JSContextRef context, JSObjectRef, JSObj
>     if (argumentCount != 3)
>         return JSValueMakeUndefined(context);
>     
>-    JSRetainPtr<JSStringRef> source(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto source = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>     bool runAtStart = JSValueToBoolean(context, arguments[1]);
>     bool allFrames = JSValueToBoolean(context, arguments[2]);
>@@ -1619,7 +1618,7 @@ static JSValueRef addUserStyleSheetCallback(JSContextRef context, JSObjectRef, J
>     if (argumentCount != 2)
>         return JSValueMakeUndefined(context);
>     
>-    JSRetainPtr<JSStringRef> source(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto source = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>     bool allFrames = JSValueToBoolean(context, arguments[1]);
>    
>@@ -1645,10 +1644,10 @@ static JSValueRef apiTestNewWindowDataLoadBaseURLCallback(JSContextRef context,
>     if (argumentCount != 2)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> utf8Data(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto utf8Data = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>-    JSRetainPtr<JSStringRef> baseURL(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto baseURL = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
>         
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -1688,11 +1687,11 @@ static JSValueRef authenticateSessionCallback(JSContextRef context, JSObjectRef,
>     if (argumentCount != 3)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> url(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto url = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> username(Adopt, JSValueToStringCopy(context, arguments[1], exception));
>+    auto username = adopt(JSValueToStringCopy(context, arguments[1], exception));
>     ASSERT(!*exception);
>-    JSRetainPtr<JSStringRef> password(Adopt, JSValueToStringCopy(context, arguments[2], exception));
>+    auto password = adopt(JSValueToStringCopy(context, arguments[2], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -1855,14 +1854,14 @@ static JSValueRef getSecureEventInputIsEnabledCallback(JSContextRef context, JSO
> static JSValueRef getTitleTextDirectionCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>-    JSRetainPtr<JSStringRef> titleDirection(Adopt, JSStringCreateWithUTF8CString(controller->titleTextDirection().c_str()));
>+    auto titleDirection = adopt(JSStringCreateWithUTF8CString(controller->titleTextDirection().c_str()));
>     return JSValueMakeString(context, titleDirection.get());
> }
> 
> static JSValueRef getInspectorTestStubURLCallback(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef* exception)
> {
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>-    JSRetainPtr<JSStringRef> url(Adopt, controller->inspectorTestStubURL());
>+    auto url = controller->inspectorTestStubURL();
>     return JSValueMakeString(context, url.get());
> }
> 
>@@ -1899,7 +1898,7 @@ static JSValueRef ignoreLegacyWebNotificationPermissionRequestsCallback(JSContex
> static JSValueRef simulateLegacyWebNotificationClickCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject)); 
>-    JSRetainPtr<JSStringRef> title(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto title = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     controller->simulateLegacyWebNotificationClick(title.get());
>     return JSValueMakeUndefined(context);
> }
>@@ -1907,7 +1906,7 @@ static JSValueRef simulateLegacyWebNotificationClickCallback(JSContextRef contex
> static JSValueRef setTextDirectionCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
> {
>     if (argumentCount == 1) {
>-        JSRetainPtr<JSStringRef> direction(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+        auto direction = adopt(JSValueToStringCopy(context, arguments[0], exception));
>         TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>         controller->setTextDirection(direction.get());
>     }
>@@ -1956,7 +1955,7 @@ static JSValueRef grantWebNotificationPermissionCallback(JSContextRef context, J
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
> 
>-    JSRetainPtr<JSStringRef> origin(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto origin = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>     controller->grantWebNotificationPermission(origin.get());
> 
>@@ -1971,7 +1970,7 @@ static JSValueRef denyWebNotificationPermissionCallback(JSContextRef context, JS
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
> 
>-    JSRetainPtr<JSStringRef> origin(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto origin = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
>     controller->denyWebNotificationPermission(origin.get());
> 
>@@ -2035,7 +2034,7 @@ static JSValueRef accummulateLogsForChannel(JSContextRef context, JSObjectRef fu
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> channel(Adopt, JSValueToStringCopy(context, arguments[0], exception));
>+    auto channel = adopt(JSValueToStringCopy(context, arguments[0], exception));
>     ASSERT(!*exception);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -2049,7 +2048,7 @@ static JSValueRef runUIScriptCallback(JSContextRef context, JSObjectRef, JSObjec
>     if (argumentCount < 1)
>         return JSValueMakeUndefined(context);
> 
>-    JSRetainPtr<JSStringRef> script = argumentCount > 0 ? JSRetainPtr<JSStringRef>(Adopt, JSValueToStringCopy(context, arguments[0], 0)) : JSRetainPtr<JSStringRef>();
>+    auto script = argumentCount > 0 ? adopt(JSValueToStringCopy(context, arguments[0], 0)) : JSRetainPtr<JSStringRef>();
>     JSValueRef callback = argumentCount > 1 ? arguments[1] : JSValueMakeUndefined(context);
> 
>     TestRunner* controller = static_cast<TestRunner*>(JSObjectGetPrivate(thisObject));
>@@ -2068,7 +2067,7 @@ static void testRunnerObjectFinalize(JSObjectRef object)
> 
> void TestRunner::makeWindowObject(JSContextRef context, JSObjectRef windowObject, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> testRunnerStr(Adopt, JSStringCreateWithUTF8CString("testRunner"));
>+    auto testRunnerStr = adopt(JSStringCreateWithUTF8CString("testRunner"));
>     ref();
> 
>     JSClassRef classRef = getJSClass();
>@@ -2464,7 +2463,7 @@ void TestRunner::callUIScriptCallback(unsigned callbackID, JSStringRef result)
> 
> void TestRunner::uiScriptDidComplete(const String& result, unsigned callbackID)
> {
>-    JSRetainPtr<JSStringRef> stringRef(Adopt, JSStringCreateWithUTF8CString(result.utf8().data()));
>+    auto stringRef = adopt(JSStringCreateWithUTF8CString(result.utf8().data()));
>     callUIScriptCallback(callbackID, stringRef.get());
> }
> 
>@@ -2479,7 +2478,7 @@ void TestRunner::setOpenPanelFiles(JSContextRef context, JSValueRef filesValue)
>         return;
> 
>     JSObjectRef files = JSValueToObject(context, filesValue, nullptr);
>-    static auto lengthProperty = JSRetainPtr<JSStringRef>(Adopt, JSStringCreateWithUTF8CString("length"));
>+    static auto lengthProperty = adopt(JSStringCreateWithUTF8CString("length"));
>     JSValueRef filesLengthValue = JSObjectGetProperty(context, files, lengthProperty.get(), nullptr);
>     if (!JSValueIsNumber(context, filesLengthValue))
>         return;
>@@ -2491,7 +2490,7 @@ void TestRunner::setOpenPanelFiles(JSContextRef context, JSValueRef filesValue)
>         if (!JSValueIsString(context, fileValue))
>             continue;
> 
>-        auto file = JSRetainPtr<JSStringRef>(Adopt, JSValueToStringCopy(context, fileValue, nullptr));
>+        auto file = adopt(JSValueToStringCopy(context, fileValue, nullptr));
>         size_t fileBufferSize = JSStringGetMaximumUTF8CStringSize(file.get()) + 1;
>         auto fileBuffer = std::make_unique<char[]>(fileBufferSize);
>         JSStringGetUTF8CString(file.get(), fileBuffer.get(), fileBufferSize);
>diff --git a/Tools/DumpRenderTree/TestRunner.h b/Tools/DumpRenderTree/TestRunner.h
>index 4b50245c75a5c21209f120907cf04f0b899beedf..b5122832ebae3ec7d7a73bd84a4d3c4c2950d505 100644
>--- a/Tools/DumpRenderTree/TestRunner.h
>+++ b/Tools/DumpRenderTree/TestRunner.h
>@@ -66,8 +66,8 @@ public:
>     void clearBackForwardList();
>     void clearPersistentUserStyleSheet();
>     bool callShouldCloseOnWebView();
>-    JSStringRef copyDecodedHostName(JSStringRef name);
>-    JSStringRef copyEncodedHostName(JSStringRef name);
>+    JSRetainPtr<JSStringRef> copyDecodedHostName(JSStringRef name);
>+    JSRetainPtr<JSStringRef> copyEncodedHostName(JSStringRef name);
>     void dispatchPendingLoadRequests();
>     void display();
>     void displayAndTrackRepaints();
>@@ -83,7 +83,7 @@ public:
>     int numberOfPendingGeolocationPermissionRequests();
>     bool isGeolocationProviderActive();
>     void overridePreference(JSStringRef key, JSStringRef value);
>-    JSStringRef pathToLocalResource(JSContextRef, JSStringRef url);
>+    JSRetainPtr<JSStringRef> pathToLocalResource(JSContextRef, JSStringRef url);
>     void queueBackNavigation(int howFarBackward);
>     void queueForwardNavigation(int howFarForward);
>     void queueLoad(JSStringRef url, JSStringRef target);
>@@ -319,7 +319,7 @@ public:
>     void showWebInspector();
>     void closeWebInspector();
>     void evaluateInWebInspector(JSStringRef script);
>-    JSStringRef inspectorTestStubURL();
>+    JSRetainPtr<JSStringRef> inspectorTestStubURL();
> 
>     void evaluateScriptInIsolatedWorld(unsigned worldID, JSObjectRef globalObject, JSStringRef script);
>     void evaluateScriptInIsolatedWorldAndReturnValue(unsigned worldID, JSObjectRef globalObject, JSStringRef script);
>diff --git a/Tools/DumpRenderTree/ios/AccessibilityControllerIOS.mm b/Tools/DumpRenderTree/ios/AccessibilityControllerIOS.mm
>index 54e4a708286813575c1f1e0a3ab66a4ae0a7cb38..61e01f5ed7675a830ba6f38f8ecf5840fbc839cb 100644
>--- a/Tools/DumpRenderTree/ios/AccessibilityControllerIOS.mm
>+++ b/Tools/DumpRenderTree/ios/AccessibilityControllerIOS.mm
>@@ -155,6 +155,5 @@ bool AccessibilityController::enhancedAccessibilityEnabled()
> 
> JSRetainPtr<JSStringRef> AccessibilityController::platformName() const
> {
>-    JSRetainPtr<JSStringRef> platformName(Adopt, JSStringCreateWithUTF8CString("ios"));
>-    return platformName;
>+    return adopt(JSStringCreateWithUTF8CString("ios"));
> }
>diff --git a/Tools/DumpRenderTree/ios/AccessibilityUIElementIOS.mm b/Tools/DumpRenderTree/ios/AccessibilityUIElementIOS.mm
>index bb6969e9e1afd72bfecefb29e57fe6e2c3e5e9c3..c94814b2f62441f6c4cee5d3db491c58685a08cf 100644
>--- a/Tools/DumpRenderTree/ios/AccessibilityUIElementIOS.mm
>+++ b/Tools/DumpRenderTree/ios/AccessibilityUIElementIOS.mm
>@@ -30,8 +30,6 @@
> #import "AccessibilityCommonMac.h"
> #import "AccessibilityNotificationHandler.h"
> #import <Foundation/Foundation.h>
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <WebCore/TextGranularity.h>
> #import <WebKit/WebFrame.h>
>@@ -123,7 +121,12 @@ @interface NSObject (WebAccessibilityObjectWrapperPrivate)
> - (CGPathRef)_accessibilityPath;
> @end
> 
>-static JSStringRef concatenateAttributeAndValue(NSString* attribute, NSString* value)
>+static JSRetainPtr<JSStringRef> createEmptyJSString()
>+{
>+    return adopt(JSStringCreateWithCharacters(nullptr, 0));
>+}
>+
>+static JSRetainPtr<JSStringRef> concatenateAttributeAndValue(NSString *attribute, NSString *value)
> {
>     Vector<UniChar> buffer([attribute length]);
>     [attribute getCharacters:buffer.data()];
>@@ -133,13 +136,13 @@ static JSStringRef concatenateAttributeAndValue(NSString* attribute, NSString* v
>     Vector<UniChar> valueBuffer([value length]);
>     [value getCharacters:valueBuffer.data()];
>     buffer.appendVector(valueBuffer);
>-    
>-    return JSStringCreateWithCharacters(buffer.data(), buffer.size());
>+
>+    return adopt(JSStringCreateWithCharacters(buffer.data(), buffer.size()));
> }
> 
> #pragma mark iPhone Attributes
> 
>-JSStringRef AccessibilityUIElement::identifier()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::identifier()
> {
>     return concatenateAttributeAndValue(@"AXIdentifier", [m_element accessibilityIdentifier]);
> }
>@@ -154,7 +157,7 @@ bool AccessibilityUIElement::isSearchField() const
>     return ([m_element accessibilityTraits] & [m_element _axSearchFieldTrait]) == [m_element _axSearchFieldTrait];
> }
> 
>-JSStringRef AccessibilityUIElement::traits()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::traits()
> {
>     return concatenateAttributeAndValue(@"AXTraits", [NSString stringWithFormat:@"%qu", [m_element accessibilityTraits]]);
> }
>@@ -187,10 +190,10 @@ AccessibilityUIElement AccessibilityUIElement::fieldsetAncestorElement()
> }
> 
> 
>-JSStringRef AccessibilityUIElement::url()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::url()
> {
>     NSURL *url = [m_element accessibilityURL];
>-    return [[url absoluteString] createJSStringRef];    
>+    return [[url absoluteString] createJSStringRef];
> }
> 
> double AccessibilityUIElement::x()
>@@ -360,30 +363,24 @@ void AccessibilityUIElement::decreaseTextSelection()
>     [m_element accessibilityModifySelection:WebCore::CharacterGranularity increase:NO];    
> }
> 
>-JSStringRef AccessibilityUIElement::speakAs()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::speakAs()
> {
>     return [[[m_element accessibilitySpeechHint] componentsJoinedByString:@", "] createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::stringForSelection() 
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForSelection()
> { 
>     NSString *stringForRange = [m_element selectionRangeString];
>-    if (!stringForRange)
>-        return 0;
>-    
>     return [stringForRange createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::stringForRange(unsigned location, unsigned length) 
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForRange(unsigned location, unsigned length)
> { 
>     NSString *stringForRange = [m_element stringForRange:NSMakeRange(location, length)];
>-    if (!stringForRange)
>-        return 0;
>-    
>     return [stringForRange createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForRange(unsigned location, unsigned length)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForRange(unsigned location, unsigned length)
> {
>     NSRange range = NSMakeRange(location, length);
>     NSAttributedString* string = [m_element attributedStringForRange:range];
>@@ -394,7 +391,7 @@ JSStringRef AccessibilityUIElement::attributedStringForRange(unsigned location,
>     return [stringWithAttrs createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForElement()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForElement()
> {
>     NSAttributedString *string = [m_element attributedStringForElement];
>     if (![string isKindOfClass:[NSAttributedString class]])
>@@ -444,7 +441,7 @@ static void _CGPathEnumerationIteration(void *info, const CGPathElement *element
>     }
> }
> 
>-JSStringRef AccessibilityUIElement::pathDescription() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::pathDescription() const
> {
>     NSMutableString *result = [NSMutableString stringWithString:@"\nStart Path\n"];
>     CGPathRef pathRef = [m_element _accessibilityPath];
>@@ -545,20 +542,20 @@ AccessibilityTextMarker AccessibilityUIElement::nextTextMarker(AccessibilityText
>     return AccessibilityTextMarker(nextMarker);
> }
> 
>-JSStringRef AccessibilityUIElement::stringForTextMarkerRange(AccessibilityTextMarkerRange* markerRange)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForTextMarkerRange(AccessibilityTextMarkerRange* markerRange)
> {
>     id textMarkers = (id)markerRange->platformTextMarkerRange();
>     if (!textMarkers || ![textMarkers isKindOfClass:[NSArray class]])
>-        return JSStringCreateWithCharacters(0, 0);
>+        return createEmptyJSString();
>     return [[m_element stringForTextMarkers:textMarkers] createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForTextMarkerRange(AccessibilityTextMarkerRange*)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForTextMarkerRange(AccessibilityTextMarkerRange*)
> {
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange*, bool)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange*, bool)
> {
>     return nullptr;
> }
>@@ -670,27 +667,27 @@ void AccessibilityUIElement::getDocumentLinks(Vector<AccessibilityUIElement>& el
> {
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfLinkedUIElements()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfLinkedUIElements()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfDocumentLinks()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfDocumentLinks()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfChildren()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfChildren()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::allAttributes()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::allAttributes()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
> {
>     if (JSStringIsEqualToUTF8CString(attribute, "AXPlaceholderValue"))
>         return [[m_element accessibilityPlaceholderValue] createJSStringRef];
>@@ -704,7 +701,7 @@ JSStringRef AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
>     if (JSStringIsEqualToUTF8CString(attribute, "AXSortDirection"))
>         return [[m_element accessibilitySortDirection] createJSStringRef];
>     
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> bool AccessibilityUIElement::isPressActionSupported()
>@@ -741,19 +738,19 @@ bool AccessibilityUIElement::isAttributeSupported(JSStringRef attribute)
>     return false;
> }
> 
>-JSStringRef AccessibilityUIElement::parameterizedAttributeNames()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::parameterizedAttributeNames()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::role()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::role()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::subrole()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::subrole()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> bool AccessibilityUIElement::scrollPageUp()
>@@ -775,43 +772,42 @@ bool AccessibilityUIElement::scrollPageRight()
>     return [m_element accessibilityScroll:UIAccessibilityScrollDirectionRight];
> }
> 
>-JSStringRef AccessibilityUIElement::roleDescription()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::roleDescription()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::computedRoleString()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::computedRoleString()
> {
>-    // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::title()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::title()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::description()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::description()
> {
>     return concatenateAttributeAndValue(@"AXLabel", [m_element accessibilityLabel]);
> }
> 
>-JSStringRef AccessibilityUIElement::orientation() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::orientation() const
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::stringValue()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringValue()
> {
>     return concatenateAttributeAndValue(@"AXValue", [m_element accessibilityValue]);
> }
> 
>-JSStringRef AccessibilityUIElement::language()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::language()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::helpText() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::helpText() const
> {
>     return concatenateAttributeAndValue(@"AXHint", [m_element accessibilityHint]);
> }
>@@ -836,9 +832,9 @@ void AccessibilityUIElement::setValue(JSStringRef valueText)
>     [m_element _accessibilitySetValue:[NSString stringWithJSStringRef:valueText]];
> }
> 
>-JSStringRef AccessibilityUIElement::valueDescription()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::valueDescription()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> int AccessibilityUIElement::insertionPointLineNumber()
>@@ -895,9 +891,9 @@ bool AccessibilityUIElement::ariaIsGrabbed() const
>     return false;
> }
> 
>-JSStringRef AccessibilityUIElement::ariaDropEffects() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::ariaDropEffects() const
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> int AccessibilityUIElement::lineForIndex(int index)
>@@ -905,39 +901,39 @@ int AccessibilityUIElement::lineForIndex(int index)
>     return -1;
> }
> 
>-JSStringRef AccessibilityUIElement::boundsForRange(unsigned location, unsigned length)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::boundsForRange(unsigned location, unsigned length)
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfColumnHeaders()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumnHeaders()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfRowHeaders()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRowHeaders()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfColumns()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumns()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfRows()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRows()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfVisibleCells()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfVisibleCells()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfHeader()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfHeader()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> int AccessibilityUIElement::rowCount()
>@@ -955,18 +951,18 @@ int AccessibilityUIElement::indexInTable()
>     return -1;
> }
> 
>-JSStringRef AccessibilityUIElement::rowIndexRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::rowIndexRange()
> {
>     NSRange range = [m_element accessibilityRowRange];
>     NSMutableString* rangeDescription = [NSMutableString stringWithFormat:@"{%lu, %lu}", (unsigned long)range.location, (unsigned long)range.length];
>     return [rangeDescription createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::columnIndexRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::columnIndexRange()
> {
>     NSRange range = [m_element accessibilityColumnRange];
>     NSMutableString* rangeDescription = [NSMutableString stringWithFormat:@"{%lu, %lu}", (unsigned long)range.location, (unsigned long)range.length];
>-    return [rangeDescription createJSStringRef];    
>+    return [rangeDescription createJSStringRef];
> }
> 
> AccessibilityUIElement AccessibilityUIElement::cellForColumnAndRow(unsigned col, unsigned row)
>@@ -989,9 +985,9 @@ void AccessibilityUIElement::scrollToGlobalPoint(int x, int y)
>     // FIXME: implement
> }
> 
>-JSStringRef AccessibilityUIElement::selectedTextRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::selectedTextRange()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> void AccessibilityUIElement::assistiveTechnologySimulatedFocus()
>@@ -1022,10 +1018,10 @@ void AccessibilityUIElement::press()
>     [m_element _accessibilityActivate];
> }
> 
>-JSStringRef AccessibilityUIElement::accessibilityValue() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::accessibilityValue() const
> {
>     // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> void AccessibilityUIElement::clearSelectedChildren() const
>@@ -1033,14 +1029,14 @@ void AccessibilityUIElement::clearSelectedChildren() const
>     // FIXME: implement
> }
> 
>-JSStringRef AccessibilityUIElement::documentEncoding()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::documentEncoding()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::documentURI()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::documentURI()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> bool AccessibilityUIElement::addNotificationListener(JSObjectRef functionCallback)
>@@ -1174,7 +1170,7 @@ AccessibilityUIElement AccessibilityUIElement::uiElementForSearchPredicate(JSCon
>     return AccessibilityUIElement([value firstObject]);
> }
> 
>-JSStringRef AccessibilityUIElement::selectTextWithCriteria(JSContextRef context, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::selectTextWithCriteria(JSContextRef context, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity)
> {
>     // FIXME: Implement.
>     return nullptr;
>@@ -1197,7 +1193,7 @@ double AccessibilityUIElement::numberAttributeValue(JSStringRef attribute)
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::classList() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::classList() const
> {
>     // FIXME: implement
>     return nullptr;
>diff --git a/Tools/DumpRenderTree/mac/AccessibilityCommonMac.h b/Tools/DumpRenderTree/mac/AccessibilityCommonMac.h
>index a5321276ba75a8dfeeede4faee55a41688d8bebe..2f013a13b692ce69a3ab264cdf2619b3198fad34 100644
>--- a/Tools/DumpRenderTree/mac/AccessibilityCommonMac.h
>+++ b/Tools/DumpRenderTree/mac/AccessibilityCommonMac.h
>@@ -28,24 +28,19 @@
>  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
>-#ifndef AccessibilityCommonMac_h
>-#define AccessibilityCommonMac_h
>+#pragma once
> 
> #import "AccessibilityUIElement.h"
>-
>-#import <JavaScriptCore/JSStringRef.h>
>+#import <JavaScriptCore/JSRetainPtr.h>
> 
> // If an unsupported attribute is passed in, it will raise an accessibility exception. These are usually caught by the Accessibility Runtime to inform
> // the AX client app of the error. However, DRT is the AX client app, so it must catch these exceptions.
> #define BEGIN_AX_OBJC_EXCEPTIONS @try {
> #define END_AX_OBJC_EXCEPTIONS } @catch(NSException *e) { if (![[e name] isEqualToString:NSAccessibilityException]) @throw; }
> 
>-
> @interface NSString (JSStringRefAdditions)
> + (NSString *)stringWithJSStringRef:(JSStringRef)jsStringRef;
>-- (JSStringRef)createJSStringRef;
>+- (JSRetainPtr<JSStringRef>)createJSStringRef;
> @end
> 
> extern NSDictionary *searchPredicateParameterizedAttributeForSearchCriteria(JSContextRef, AccessibilityUIElement *startElement, bool isDirectionNext, unsigned resultsLimit, JSValueRef searchKey, JSStringRef searchText, bool visibleOnly, bool immediateDescendantsOnly);
>-
>-#endif // AccessibilityCommonMac_h
>diff --git a/Tools/DumpRenderTree/mac/AccessibilityCommonMac.mm b/Tools/DumpRenderTree/mac/AccessibilityCommonMac.mm
>index 6597cad1805a154a25a0b22979390e7e38f71afb..0b867adcb90c3122416dcc265f3853b61b6d4713 100644
>--- a/Tools/DumpRenderTree/mac/AccessibilityCommonMac.mm
>+++ b/Tools/DumpRenderTree/mac/AccessibilityCommonMac.mm
>@@ -31,8 +31,6 @@
> #import "config.h"
> #import "AccessibilityCommonMac.h"
> 
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> 
> @implementation NSString (JSStringRefAdditions)
>@@ -45,9 +43,9 @@ + (NSString *)stringWithJSStringRef:(JSStringRef)jsStringRef
>     return CFBridgingRelease(JSStringCopyCFString(kCFAllocatorDefault, jsStringRef));
> }
> 
>-- (JSStringRef)createJSStringRef
>+- (JSRetainPtr<JSStringRef>)createJSStringRef
> {
>-    return JSStringCreateWithCFString((__bridge CFStringRef)self);
>+    return adopt(JSStringCreateWithCFString((__bridge CFStringRef)self));
> }
> 
> NSDictionary *searchPredicateParameterizedAttributeForSearchCriteria(JSContextRef context, AccessibilityUIElement *startElement, bool isDirectionNext, unsigned resultsLimit, JSValueRef searchKey, JSStringRef searchText, bool visibleOnly, bool immediateDescendantsOnly)
>@@ -64,14 +62,14 @@ NSDictionary *searchPredicateParameterizedAttributeForSearchCriteria(JSContextRe
>     if (searchKey) {
>         id searchKeyParameter = nil;
>         if (JSValueIsString(context, searchKey)) {
>-            JSRetainPtr<JSStringRef> searchKeyString(Adopt, JSValueToStringCopy(context, searchKey, nullptr));
>+            auto searchKeyString = adopt(JSValueToStringCopy(context, searchKey, nullptr));
>             if (searchKeyString)
>                 searchKeyParameter = [NSString stringWithJSStringRef:searchKeyString.get()];
>         } else if (JSValueIsObject(context, searchKey)) {
>             JSObjectRef searchKeyArray = JSValueToObject(context, searchKey, nullptr);
>             unsigned searchKeyArrayLength = 0;
>             
>-            JSRetainPtr<JSStringRef> lengthPropertyString(Adopt, JSStringCreateWithUTF8CString("length"));
>+            auto lengthPropertyString = adopt(JSStringCreateWithUTF8CString("length"));
>             JSValueRef searchKeyArrayLengthValue = JSObjectGetProperty(context, searchKeyArray, lengthPropertyString.get(), nullptr);
>             if (searchKeyArrayLengthValue && JSValueIsNumber(context, searchKeyArrayLengthValue))
>                 searchKeyArrayLength = static_cast<unsigned>(JSValueToNumber(context, searchKeyArrayLengthValue, nullptr));
>diff --git a/Tools/DumpRenderTree/mac/AccessibilityControllerMac.mm b/Tools/DumpRenderTree/mac/AccessibilityControllerMac.mm
>index 6b544553ffa8866947ff6723b345e118e3ba7c19..51f031ddbbcd853adb4fe7147d85a52576a0078b 100644
>--- a/Tools/DumpRenderTree/mac/AccessibilityControllerMac.mm
>+++ b/Tools/DumpRenderTree/mac/AccessibilityControllerMac.mm
>@@ -158,6 +158,5 @@ bool AccessibilityController::enhancedAccessibilityEnabled()
> 
> JSRetainPtr<JSStringRef> AccessibilityController::platformName() const
> {
>-    JSRetainPtr<JSStringRef> platformName(Adopt, JSStringCreateWithUTF8CString("mac"));
>-    return platformName;
>+    return adopt(JSStringCreateWithUTF8CString("mac"));
> }
>diff --git a/Tools/DumpRenderTree/mac/AccessibilityNotificationHandler.mm b/Tools/DumpRenderTree/mac/AccessibilityNotificationHandler.mm
>index 03aa9c685a10e74614e9d26eb56c2526fc9b4139..9d7ff6e9be6444537a9ffa5ba863bec467aafba6 100644
>--- a/Tools/DumpRenderTree/mac/AccessibilityNotificationHandler.mm
>+++ b/Tools/DumpRenderTree/mac/AccessibilityNotificationHandler.mm
>@@ -34,7 +34,6 @@
> #import "AccessibilityUIElement.h"
> 
> #import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <WebKit/WebFrame.h>
> #import <objc/runtime.h>
>@@ -45,14 +44,14 @@ + (void)accessibilitySetShouldRepostNotifications:(BOOL)repost;
> @end
> 
> @interface NSString (JSStringRefAdditions)
>-- (JSStringRef)createJSStringRef;
>+- (JSRetainPtr<JSStringRef>)createJSStringRef;
> @end
> 
> @implementation NSString (JSStringRefAdditions)
> 
>-- (JSStringRef)createJSStringRef
>+- (JSRetainPtr<JSStringRef>)createJSStringRef
> {
>-    return JSStringCreateWithCFString((__bridge CFStringRef)self);
>+    return adopt(JSStringCreateWithCFString((__bridge CFStringRef)self));
> }
> 
> @end
>@@ -118,7 +117,7 @@ - (void)stopObserving
> static JSValueRef makeValueRefForValue(JSContextRef context, id value)
> {
>     if ([value isKindOfClass:[NSString class]])
>-        return JSValueMakeString(context, adopt([value createJSStringRef]).get());
>+        return JSValueMakeString(context, [value createJSStringRef].get());
>     if ([value isKindOfClass:[NSNumber class]]) {
>         if (!strcmp([value objCType], @encode(BOOL)))
>             return JSValueMakeBoolean(context, [value boolValue]);
>@@ -151,7 +150,7 @@ static JSValueRef makeObjectRefForDictionary(JSContextRef context, NSDictionary
>     [dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop)
>     {
>         if (JSValueRef propertyValue = makeValueRefForValue(context, obj))
>-            JSObjectSetProperty(context, object, adopt([key createJSStringRef]).get(), propertyValue, kJSPropertyAttributeNone, nullptr);
>+            JSObjectSetProperty(context, object, [key createJSStringRef].get(), propertyValue, kJSPropertyAttributeNone, nullptr);
>     }];
> 
>     return object;
>@@ -166,7 +165,7 @@ - (void)_notificationReceived:(NSNotification *)notification
>         return;
> 
>     NSDictionary *userInfo = [[notification userInfo] objectForKey:@"userInfo"];
>-    JSValueRef notificationNameArgument = JSValueMakeString([mainFrame globalContext], adopt([notificationName createJSStringRef]).get());
>+    JSValueRef notificationNameArgument = JSValueMakeString([mainFrame globalContext], [notificationName createJSStringRef].get());
>     JSValueRef userInfoArgument = makeObjectRefForDictionary([mainFrame globalContext], userInfo);
>     if (m_platformElement) {
>         // Listener for one element gets the notification name and userInfo.
>diff --git a/Tools/DumpRenderTree/mac/AccessibilityUIElementMac.mm b/Tools/DumpRenderTree/mac/AccessibilityUIElementMac.mm
>index ba9b550d7be8fc11369c3f125a48184c52bb41e7..b242a96f4b8047a2ad9297fad0751cf48832669c 100644
>--- a/Tools/DumpRenderTree/mac/AccessibilityUIElementMac.mm
>+++ b/Tools/DumpRenderTree/mac/AccessibilityUIElementMac.mm
>@@ -30,8 +30,6 @@
> #import "AccessibilityUIElement.h"
> 
> #import <Foundation/Foundation.h>
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <WebKit/WebFrame.h>
> #import <WebKit/WebHTMLView.h>
>@@ -81,6 +79,11 @@ - (void)_accessibilityScrollToGlobalPoint:(NSPoint)point;
> - (void)_accessibilitySetValue:(id)value forAttribute:(NSString*)attributeName;
> @end
> 
>+static JSRetainPtr<JSStringRef> createEmptyJSString()
>+{
>+    return adopt(JSStringCreateWithCharacters(nullptr, 0));
>+}
>+
> AccessibilityUIElement::AccessibilityUIElement(PlatformUIElement element)
>     : m_element(element)
>     , m_notificationHandler(0)
>@@ -174,7 +177,7 @@ static NSString* attributesOfElement(id accessibilityObject)
>     return attributesString;
> }
> 
>-static JSStringRef concatenateAttributeAndValue(NSString* attribute, NSString* value)
>+static JSRetainPtr<JSStringRef> concatenateAttributeAndValue(NSString *attribute, NSString *value)
> {
>     Vector<UniChar> buffer([attribute length]);
>     [attribute getCharacters:buffer.data()];
>@@ -185,7 +188,7 @@ static JSStringRef concatenateAttributeAndValue(NSString* attribute, NSString* v
>     [value getCharacters:valueBuffer.data()];
>     buffer.appendVector(valueBuffer);
> 
>-    return JSStringCreateWithCharacters(buffer.data(), buffer.size());
>+    return adopt(JSStringCreateWithCharacters(buffer.data(), buffer.size()));
> }
> 
> static void convertNSArrayToVector(NSArray* array, Vector<AccessibilityUIElement>& elementVector)
>@@ -195,7 +198,7 @@ static void convertNSArrayToVector(NSArray* array, Vector<AccessibilityUIElement
>         elementVector.append(AccessibilityUIElement([array objectAtIndex:i]));
> }
> 
>-static JSStringRef descriptionOfElements(Vector<AccessibilityUIElement>& elementVector)
>+static JSRetainPtr<JSStringRef> descriptionOfElements(Vector<AccessibilityUIElement>& elementVector)
> {
>     NSMutableString* allElementString = [NSMutableString string];
>     size_t size = elementVector.size();
>@@ -217,7 +220,7 @@ static NSDictionary *selectTextParameterizedAttributeForCriteria(JSContextRef co
>     if (searchStrings) {
>         NSMutableArray *searchStringsParameter = [NSMutableArray array];
>         if (JSValueIsString(context, searchStrings)) {
>-            JSRetainPtr<JSStringRef> searchStringsString(Adopt, JSValueToStringCopy(context, searchStrings, nullptr));
>+            auto searchStringsString = adopt(JSValueToStringCopy(context, searchStrings, nullptr));
>             if (searchStringsString)
>                 [searchStringsParameter addObject:[NSString stringWithJSStringRef:searchStringsString.get()]];
>         }
>@@ -225,13 +228,13 @@ static NSDictionary *selectTextParameterizedAttributeForCriteria(JSContextRef co
>             JSObjectRef searchStringsArray = JSValueToObject(context, searchStrings, nullptr);
>             unsigned searchStringsArrayLength = 0;
>             
>-            JSRetainPtr<JSStringRef> lengthPropertyString(Adopt, JSStringCreateWithUTF8CString("length"));
>+            auto lengthPropertyString = adopt(JSStringCreateWithUTF8CString("length"));
>             JSValueRef searchStringsArrayLengthValue = JSObjectGetProperty(context, searchStringsArray, lengthPropertyString.get(), nullptr);
>             if (searchStringsArrayLengthValue && JSValueIsNumber(context, searchStringsArrayLengthValue))
>                 searchStringsArrayLength = static_cast<unsigned>(JSValueToNumber(context, searchStringsArrayLengthValue, nullptr));
>             
>             for (unsigned i = 0; i < searchStringsArrayLength; ++i) {
>-                JSRetainPtr<JSStringRef> searchStringsString(Adopt, JSValueToStringCopy(context, JSObjectGetPropertyAtIndex(context, searchStringsArray, i, nullptr), nullptr));
>+                auto searchStringsString = adopt(JSValueToStringCopy(context, JSObjectGetPropertyAtIndex(context, searchStringsArray, i, nullptr), nullptr));
>                 if (searchStringsString)
>                     [searchStringsParameter addObject:[NSString stringWithJSStringRef:searchStringsString.get()]];
>             }
>@@ -445,34 +448,34 @@ AccessibilityUIElement AccessibilityUIElement::disclosedByRow()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfLinkedUIElements()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfLinkedUIElements()
> {
>     Vector<AccessibilityUIElement> linkedElements;
>     getLinkedUIElements(linkedElements);
>     return descriptionOfElements(linkedElements);
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfDocumentLinks()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfDocumentLinks()
> {
>     Vector<AccessibilityUIElement> linkElements;
>     getDocumentLinks(linkElements);
>     return descriptionOfElements(linkElements);
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfChildren()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfChildren()
> {
>     Vector<AccessibilityUIElement> children;
>     getChildren(children);
>     return descriptionOfElements(children);
> }
> 
>-JSStringRef AccessibilityUIElement::allAttributes()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::allAttributes()
> {
>     NSString* attributes = attributesOfElement(m_element);
>     return [attributes createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:[NSString stringWithJSStringRef:attribute]];
>@@ -568,7 +571,7 @@ bool AccessibilityUIElement::isAttributeSupported(JSStringRef attribute)
>     return false;
> }
> 
>-JSStringRef AccessibilityUIElement::parameterizedAttributeNames()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::parameterizedAttributeNames()
> {
>     NSArray* supportedParameterizedAttributes = [m_element accessibilityParameterizedAttributeNames];
>     
>@@ -580,7 +583,7 @@ JSStringRef AccessibilityUIElement::parameterizedAttributeNames()
>     return [attributesString createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::role()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::role()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSString *role = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilityRoleAttribute], m_element);
>@@ -590,7 +593,7 @@ JSStringRef AccessibilityUIElement::role()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::subrole()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::subrole()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSString* role = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilitySubroleAttribute], m_element);
>@@ -600,7 +603,7 @@ JSStringRef AccessibilityUIElement::subrole()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::roleDescription()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::roleDescription()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSString* role = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilityRoleDescriptionAttribute], m_element);
>@@ -610,7 +613,7 @@ JSStringRef AccessibilityUIElement::roleDescription()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::computedRoleString()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::computedRoleString()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSString *computedRoleString = descriptionOfValue([m_element accessibilityAttributeValue:@"AXARIARole"], m_element);
>@@ -620,7 +623,7 @@ JSStringRef AccessibilityUIElement::computedRoleString()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::title()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::title()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSString* title = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilityTitleAttribute], m_element);
>@@ -630,7 +633,7 @@ JSStringRef AccessibilityUIElement::title()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::description()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::description()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id description = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilityDescriptionAttribute], m_element);
>@@ -640,17 +643,17 @@ JSStringRef AccessibilityUIElement::description()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::orientation() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::orientation() const
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id description = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilityOrientationAttribute], m_element);
>-    return concatenateAttributeAndValue(@"AXOrientation", description);    
>+    return concatenateAttributeAndValue(@"AXOrientation", description);
>     END_AX_OBJC_EXCEPTIONS
> 
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::stringValue()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringValue()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id description = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilityValueAttribute], m_element);
>@@ -661,7 +664,7 @@ JSStringRef AccessibilityUIElement::stringValue()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::language()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::language()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id description = descriptionOfValue([m_element accessibilityAttributeValue:@"AXLanguage"], m_element);
>@@ -671,7 +674,7 @@ JSStringRef AccessibilityUIElement::language()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::helpText() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::helpText() const
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id description = descriptionOfValue([m_element accessibilityAttributeValue:NSAccessibilityHelpAttribute], m_element);
>@@ -774,7 +777,7 @@ double AccessibilityUIElement::maxValue()
>     return 0.0;
> }
> 
>-JSStringRef AccessibilityUIElement::valueDescription()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::valueDescription()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSString* valueDescription = [m_element accessibilityAttributeValue:NSAccessibilityValueDescriptionAttribute];
>@@ -898,7 +901,7 @@ int AccessibilityUIElement::hierarchicalLevel() const
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::speakAs()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::speakAs()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:@"AXDRTSpeechAttribute"];
>@@ -909,7 +912,7 @@ JSStringRef AccessibilityUIElement::speakAs()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::classList() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::classList() const
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:@"AXDOMClassList"];
>@@ -941,7 +944,7 @@ bool AccessibilityUIElement::ariaIsGrabbed() const
>     return false;
> }
> 
>-JSStringRef AccessibilityUIElement::ariaDropEffects() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::ariaDropEffects() const
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:NSAccessibilityDropEffectsAttribute];
>@@ -974,7 +977,7 @@ int AccessibilityUIElement::lineForIndex(int index)
>     return -1;
> }
> 
>-JSStringRef AccessibilityUIElement::rangeForLine(int line)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::rangeForLine(int line)
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:NSAccessibilityRangeForLineParameterizedAttribute forParameter:[NSNumber numberWithInt:line]];
>@@ -985,7 +988,7 @@ JSStringRef AccessibilityUIElement::rangeForLine(int line)
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::rangeForPosition(int x, int y)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::rangeForPosition(int x, int y)
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:NSAccessibilityRangeForPositionParameterizedAttribute forParameter:[NSValue valueWithPoint:NSMakePoint(x, y)]];
>@@ -997,7 +1000,7 @@ JSStringRef AccessibilityUIElement::rangeForPosition(int x, int y)
> }
> 
> 
>-JSStringRef AccessibilityUIElement::boundsForRange(unsigned location, unsigned length)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::boundsForRange(unsigned location, unsigned length)
> {
>     NSRange range = NSMakeRange(location, length);
>     BEGIN_AX_OBJC_EXCEPTIONS
>@@ -1014,7 +1017,7 @@ JSStringRef AccessibilityUIElement::boundsForRange(unsigned location, unsigned l
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::stringForRange(unsigned location, unsigned length)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForRange(unsigned location, unsigned length)
> {
>     NSRange range = NSMakeRange(location, length);
>     BEGIN_AX_OBJC_EXCEPTIONS
>@@ -1028,7 +1031,7 @@ JSStringRef AccessibilityUIElement::stringForRange(unsigned location, unsigned l
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForRange(unsigned location, unsigned length)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForRange(unsigned location, unsigned length)
> {
>     NSRange range = NSMakeRange(location, length);
>     BEGIN_AX_OBJC_EXCEPTIONS
>@@ -1087,7 +1090,7 @@ AccessibilityUIElement AccessibilityUIElement::uiElementForSearchPredicate(JSCon
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::selectTextWithCriteria(JSContextRef context, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::selectTextWithCriteria(JSContextRef context, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity)
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSDictionary *parameterizedAttribute = selectTextParameterizedAttributeForCriteria(context, ambiguityResolution, searchStrings, replacementString, activity);
>@@ -1099,7 +1102,7 @@ JSStringRef AccessibilityUIElement::selectTextWithCriteria(JSContextRef context,
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfColumnHeaders()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumnHeaders()
> {
>     // not yet defined in AppKit... odd
>     BEGIN_AX_OBJC_EXCEPTIONS
>@@ -1112,7 +1115,7 @@ JSStringRef AccessibilityUIElement::attributesOfColumnHeaders()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfRowHeaders()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRowHeaders()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSArray* rowHeadersArray = [m_element accessibilityAttributeValue:@"AXRowHeaderUIElements"];
>@@ -1124,7 +1127,7 @@ JSStringRef AccessibilityUIElement::attributesOfRowHeaders()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfColumns()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumns()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSArray* columnsArray = [m_element accessibilityAttributeValue:NSAccessibilityColumnsAttribute];
>@@ -1136,7 +1139,7 @@ JSStringRef AccessibilityUIElement::attributesOfColumns()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfRows()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRows()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSArray* rowsArray = [m_element accessibilityAttributeValue:NSAccessibilityRowsAttribute];
>@@ -1148,7 +1151,7 @@ JSStringRef AccessibilityUIElement::attributesOfRows()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfVisibleCells()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfVisibleCells()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSArray* cellsArray = [m_element accessibilityAttributeValue:@"AXVisibleCells"];
>@@ -1160,7 +1163,7 @@ JSStringRef AccessibilityUIElement::attributesOfVisibleCells()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfHeader()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfHeader()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id headerObject = [m_element accessibilityAttributeValue:NSAccessibilityHeaderAttribute];
>@@ -1204,7 +1207,7 @@ int AccessibilityUIElement::indexInTable()
>     return -1;
> }
> 
>-JSStringRef AccessibilityUIElement::rowIndexRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::rowIndexRange()
> {
>     NSRange range = NSMakeRange(0, 0);
>     BEGIN_AX_OBJC_EXCEPTIONS
>@@ -1218,7 +1221,7 @@ JSStringRef AccessibilityUIElement::rowIndexRange()
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::columnIndexRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::columnIndexRange()
> {
>     NSRange range = NSMakeRange(0, 0);
>     BEGIN_AX_OBJC_EXCEPTIONS
>@@ -1226,7 +1229,7 @@ JSStringRef AccessibilityUIElement::columnIndexRange()
>     if (indexRange)
>         range = [indexRange rangeValue];
>     NSMutableString* rangeDescription = [NSMutableString stringWithFormat:@"{%lu, %lu}",static_cast<unsigned long>(range.location), static_cast<unsigned long>(range.length)];
>-    return [rangeDescription createJSStringRef];    
>+    return [rangeDescription createJSStringRef];
>     END_AX_OBJC_EXCEPTIONS
>     
>     return nullptr;
>@@ -1266,7 +1269,7 @@ AccessibilityUIElement AccessibilityUIElement::verticalScrollbar() const
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::pathDescription() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::pathDescription() const
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSMutableString *result = [NSMutableString stringWithString:@"\nStart Path\n"];
>@@ -1299,7 +1302,7 @@ JSStringRef AccessibilityUIElement::pathDescription() const
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::selectedTextRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::selectedTextRange()
> {
>     NSRange range = NSMakeRange(NSNotFound, 0);
>     BEGIN_AX_OBJC_EXCEPTIONS
>@@ -1307,7 +1310,7 @@ JSStringRef AccessibilityUIElement::selectedTextRange()
>     if (indexRange)
>         range = [indexRange rangeValue];
>     NSMutableString *rangeDescription = [NSMutableString stringWithFormat:@"{%lu, %lu}", static_cast<unsigned long>(range.location), static_cast<unsigned long>(range.length)];
>-    return [rangeDescription createJSStringRef];    
>+    return [rangeDescription createJSStringRef];
>     END_AX_OBJC_EXCEPTIONS
>     
>     return nullptr;
>@@ -1397,13 +1400,13 @@ void AccessibilityUIElement::clearSelectedChildren() const
>     // FIXME: implement
> }
> 
>-JSStringRef AccessibilityUIElement::accessibilityValue() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::accessibilityValue() const
> {
>     // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::documentEncoding()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::documentEncoding()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:@"AXDocumentEncoding"];
>@@ -1411,10 +1414,10 @@ JSStringRef AccessibilityUIElement::documentEncoding()
>         return [value createJSStringRef];
>     END_AX_OBJC_EXCEPTIONS
>     
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::documentURI()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::documentURI()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id value = [m_element accessibilityAttributeValue:@"AXDocumentURI"];
>@@ -1422,14 +1425,14 @@ JSStringRef AccessibilityUIElement::documentURI()
>         return [value createJSStringRef];
>     END_AX_OBJC_EXCEPTIONS
>     
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::url()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::url()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSURL *url = [m_element accessibilityAttributeValue:NSAccessibilityURLAttribute];
>-    return [[url absoluteString] createJSStringRef];    
>+    return [[url absoluteString] createJSStringRef];
>     END_AX_OBJC_EXCEPTIONS
>     
>     return nullptr;
>@@ -1705,7 +1708,7 @@ AccessibilityTextMarker AccessibilityUIElement::nextTextMarker(AccessibilityText
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::stringForTextMarkerRange(AccessibilityTextMarkerRange* markerRange)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForTextMarkerRange(AccessibilityTextMarkerRange* markerRange)
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     id textString = [m_element accessibilityAttributeValue:@"AXStringForTextMarkerRange" forParameter:(__bridge id)markerRange->platformTextMarkerRange()];
>@@ -1715,7 +1718,7 @@ JSStringRef AccessibilityUIElement::stringForTextMarkerRange(AccessibilityTextMa
>     return nullptr;
> }
> 
>-static JSStringRef createJSStringRef(id string)
>+static JSRetainPtr<JSStringRef> createJSStringRef(id string)
> {
>     if (!string)
>         return nullptr;
>@@ -1736,13 +1739,13 @@ static JSStringRef createJSStringRef(id string)
>     return [mutableString createJSStringRef];
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForTextMarkerRange(AccessibilityTextMarkerRange* markerRange)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForTextMarkerRange(AccessibilityTextMarkerRange* markerRange)
> {
>     id string = [m_element accessibilityAttributeValue:@"AXAttributedStringForTextMarkerRange" forParameter:(__bridge id)markerRange->platformTextMarkerRange()];
>     return createJSStringRef(string);
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange* markerRange, bool includeSpellCheck)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange* markerRange, bool includeSpellCheck)
> {
>     id parameter = nil;
>     if (includeSpellCheck)
>@@ -1955,7 +1958,7 @@ AccessibilityTextMarker AccessibilityUIElement::nextSentenceEndTextMarkerForText
> 
> #endif // SUPPORTS_AX_TEXTMARKERS && PLATFORM(MAC)
> 
>-JSStringRef AccessibilityUIElement::supportedActions()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::supportedActions()
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSArray *names = [m_element accessibilityActionNames];
>@@ -1976,7 +1979,7 @@ static NSString *convertMathMultiscriptPairsToString(NSArray *pairs)
>     return result;
> }
> 
>-JSStringRef AccessibilityUIElement::mathPostscriptsDescription() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::mathPostscriptsDescription() const
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSArray *pairs = [m_element accessibilityAttributeValue:@"AXMathPostscripts"];
>@@ -1986,7 +1989,7 @@ JSStringRef AccessibilityUIElement::mathPostscriptsDescription() const
>     return nullptr;
> }
> 
>-JSStringRef AccessibilityUIElement::mathPrescriptsDescription() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::mathPrescriptsDescription() const
> {
>     BEGIN_AX_OBJC_EXCEPTIONS
>     NSArray *pairs = [m_element accessibilityAttributeValue:@"AXMathPrescripts"];
>diff --git a/Tools/DumpRenderTree/mac/FrameLoadDelegate.mm b/Tools/DumpRenderTree/mac/FrameLoadDelegate.mm
>index 331e1d8d215b3dfb4788fbdc70883c512bc962cd..05b0392de21dbf05235c979b98dfcbc38f7d7098 100644
>--- a/Tools/DumpRenderTree/mac/FrameLoadDelegate.mm
>+++ b/Tools/DumpRenderTree/mac/FrameLoadDelegate.mm
>@@ -347,7 +347,7 @@ - (void)didClearWindowObjectForFrame:(WebFrame *)frame inIsolatedWorld:(WebScrip
>     if (!globalObject)
>         return;
> 
>-    JSObjectSetProperty(ctx, globalObject, JSRetainPtr<JSStringRef>(Adopt, JSStringCreateWithUTF8CString("__worldID")).get(), JSValueMakeNumber(ctx, worldIDForWorld(world)), kJSPropertyAttributeReadOnly, 0);
>+    JSObjectSetProperty(ctx, globalObject, adopt(JSStringCreateWithUTF8CString("__worldID")).get(), JSValueMakeNumber(ctx, worldIDForWorld(world)), kJSPropertyAttributeReadOnly, 0);
> }
> 
> - (void)webView:(WebView *)sender didClearWindowObjectForFrame:(WebFrame *)frame inScriptWorld:(WebScriptWorld *)world
>diff --git a/Tools/DumpRenderTree/mac/TestRunnerMac.mm b/Tools/DumpRenderTree/mac/TestRunnerMac.mm
>index 0f90274a4a04758fd43b33f17cbc833d1c76914f..b5231655e8b6cae174fbf92300249df667c65e9f 100644
>--- a/Tools/DumpRenderTree/mac/TestRunnerMac.mm
>+++ b/Tools/DumpRenderTree/mac/TestRunnerMac.mm
>@@ -40,8 +40,6 @@
> #import "WorkQueue.h"
> #import "WorkQueueItem.h"
> #import <Foundation/Foundation.h>
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <WebCore/GeolocationPosition.h>
> #import <WebKit/DOMDocument.h>
>@@ -187,7 +185,7 @@ JSValueRef originsArrayToJS(JSContextRef context, NSArray *origins)
>     JSObjectRef arrayObj = JSValueToObject(context, arrayResult, 0);
>     for (NSUInteger i = 0; i < count; i++) {
>         NSString *origin = [[origins objectAtIndex:i] databaseIdentifier];
>-        JSRetainPtr<JSStringRef> originJS(Adopt, JSStringCreateWithCFString((__bridge CFStringRef)origin));
>+        auto originJS = adopt(JSStringCreateWithCFString((__bridge CFStringRef)origin));
>         JSObjectSetPropertyAtIndex(context, arrayObj, i, JSValueMakeString(context, originJS.get()), 0);
>     }
> 
>@@ -249,18 +247,18 @@ void TestRunner::clearBackForwardList()
>     [item release];
> }
> 
>-JSStringRef TestRunner::copyDecodedHostName(JSStringRef name)
>+JSRetainPtr<JSStringRef> TestRunner::copyDecodedHostName(JSStringRef name)
> {
>-    RetainPtr<CFStringRef> nameCF = adoptCF(JSStringCopyCFString(kCFAllocatorDefault, name));
>+    auto nameCF = adoptCF(JSStringCopyCFString(kCFAllocatorDefault, name));
>     NSString *nameNS = (__bridge NSString *)nameCF.get();
>-    return JSStringCreateWithCFString((__bridge CFStringRef)[nameNS _web_decodeHostName]);
>+    return adopt(JSStringCreateWithCFString((__bridge CFStringRef)[nameNS _web_decodeHostName]));
> }
> 
>-JSStringRef TestRunner::copyEncodedHostName(JSStringRef name)
>+JSRetainPtr<JSStringRef> TestRunner::copyEncodedHostName(JSStringRef name)
> {
>-    RetainPtr<CFStringRef> nameCF = adoptCF(JSStringCopyCFString(kCFAllocatorDefault, name));
>+    auto nameCF = adoptCF(JSStringCopyCFString(kCFAllocatorDefault, name));
>     NSString *nameNS = (__bridge NSString *)nameCF.get();
>-    return JSStringCreateWithCFString((__bridge CFStringRef)[nameNS _web_encodeHostName]);
>+    return adopt(JSStringCreateWithCFString((__bridge CFStringRef)[nameNS _web_encodeHostName]));
> }
> 
> void TestRunner::display()
>@@ -344,7 +342,7 @@ static inline std::string resourceRootAbsolutePath(const std::string& testURL, c
>     return testURL.substr(0, indexOfSeparatorAfterDirectoryName(expectedRootName, testURL));
> }
> 
>-JSStringRef TestRunner::pathToLocalResource(JSContextRef context, JSStringRef localResourceJSString)
>+JSRetainPtr<JSStringRef> TestRunner::pathToLocalResource(JSContextRef context, JSStringRef localResourceJSString)
> {
>     // The passed in path will be an absolute path to the resource starting
>     // with "/tmp" or "/tmp/LayoutTests", optionally starting with the explicit file:// protocol.
>@@ -372,7 +370,7 @@ JSStringRef TestRunner::pathToLocalResource(JSContextRef context, JSStringRef lo
>         ASSERT(absolutePathToLocalResource[0] == '/');
>         absolutePathToLocalResource = std::string("file://") + absolutePathToLocalResource;
>     }
>-    return JSStringCreateWithUTF8CString(absolutePathToLocalResource.c_str());
>+    return adopt(JSStringCreateWithUTF8CString(absolutePathToLocalResource.c_str()));
> }
> 
> void TestRunner::queueLoad(JSStringRef url, JSStringRef target)
>@@ -383,7 +381,7 @@ void TestRunner::queueLoad(JSStringRef url, JSStringRef target)
>     NSURL *nsurl = [NSURL URLWithString:urlNS relativeToURL:[[[mainFrame dataSource] response] URL]];
>     NSString *nsurlString = [nsurl absoluteString];
> 
>-    JSRetainPtr<JSStringRef> absoluteURL(Adopt, JSStringCreateWithUTF8CString([nsurlString UTF8String]));
>+    auto absoluteURL = adopt(JSStringCreateWithUTF8CString([nsurlString UTF8String]));
>     WorkQueue::singleton().queue(new LoadItem(absoluteURL.get(), target));
> }
> 
>@@ -681,7 +679,7 @@ bool TestRunner::findString(JSContextRef context, JSStringRef target, JSObjectRe
> {
>     WebFindOptions options = 0;
> 
>-    JSRetainPtr<JSStringRef> lengthPropertyName(Adopt, JSStringCreateWithUTF8CString("length"));
>+    auto lengthPropertyName = adopt(JSStringCreateWithUTF8CString("length"));
>     JSValueRef lengthValue = JSObjectGetProperty(context, optionsArray, lengthPropertyName.get(), 0);
>     if (!JSValueIsNumber(context, lengthValue))
>         return false;
>@@ -694,7 +692,7 @@ bool TestRunner::findString(JSContextRef context, JSStringRef target, JSObjectRe
>         if (!JSValueIsString(context, value))
>             continue;
> 
>-        JSRetainPtr<JSStringRef> optionName(Adopt, JSValueToStringCopy(context, value, 0));
>+        auto optionName = adopt(JSValueToStringCopy(context, value, nullptr));
> 
>         if (JSStringIsEqualToUTF8CString(optionName.get(), "CaseInsensitive"))
>             options |= WebFindOptionsCaseInsensitive;
>@@ -816,7 +814,7 @@ void TestRunner::evaluateInWebInspector(JSStringRef script)
>     [[[mainFrame webView] inspector] evaluateInFrontend:nil script:scriptNS];
> }
> 
>-JSStringRef TestRunner::inspectorTestStubURL()
>+JSRetainPtr<JSStringRef> TestRunner::inspectorTestStubURL()
> {
> #if PLATFORM(IOS)
>     return nullptr;
>@@ -833,7 +831,7 @@ JSStringRef TestRunner::inspectorTestStubURL()
>         return nullptr;
> 
>     CFStringRef urlString = CFURLGetString(url.get());
>-    return JSStringCreateWithCFString(urlString);
>+    return adopt(JSStringCreateWithCFString(urlString));
> #endif
> }
> 
>diff --git a/Tools/DumpRenderTree/win/AccessibilityControllerWin.cpp b/Tools/DumpRenderTree/win/AccessibilityControllerWin.cpp
>index b985df66cf5c5efcba5749fca4c41922b0eb4abd..f416482da62d259a4738fa99480afb689645a27c 100644
>--- a/Tools/DumpRenderTree/win/AccessibilityControllerWin.cpp
>+++ b/Tools/DumpRenderTree/win/AccessibilityControllerWin.cpp
>@@ -363,7 +363,7 @@ void AccessibilityController::winNotificationReceived(PlatformUIElement element,
>         if (!isSame)
>             continue;
> 
>-        JSRetainPtr<JSStringRef> jsNotification(Adopt, JSStringCreateWithUTF8CString(eventName.c_str()));
>+        auto jsNotification = adopt(JSStringCreateWithUTF8CString(eventName.c_str()));
>         JSValueRef argument = JSValueMakeString(frame->globalContext(), jsNotification.get());
>         JSObjectCallAsFunction(frame->globalContext(), slot.value, 0, 1, &argument, 0);
>     }
>@@ -391,6 +391,5 @@ bool AccessibilityController::enhancedAccessibilityEnabled()
> 
> JSRetainPtr<JSStringRef> AccessibilityController::platformName() const
> {
>-    JSRetainPtr<JSStringRef> platformName(Adopt, JSStringCreateWithUTF8CString("win"));
>-    return platformName;
>+    return adopt(JSStringCreateWithUTF8CString("win"));
> }
>diff --git a/Tools/DumpRenderTree/win/AccessibilityUIElementWin.cpp b/Tools/DumpRenderTree/win/AccessibilityUIElementWin.cpp
>index a5595421f187957ad3968ae9a681dfc7429d46a0..e1b16ff1e53f7a782d2e677bfb163096cc1517d7 100644
>--- a/Tools/DumpRenderTree/win/AccessibilityUIElementWin.cpp
>+++ b/Tools/DumpRenderTree/win/AccessibilityUIElementWin.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2008, 2013, 2014-2015 Apple Inc. All Rights Reserved.
>+ * Copyright (C) 2008-2018 Apple Inc. All Rights Reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -38,6 +38,11 @@
> 
> using std::wstring;
> 
>+static JSRetainPtr<JSStringRef> createEmptyJSString()
>+{
>+    return adopt(JSStringCreateWithCharacters(nullptr, 0));
>+}
>+
> static COMPtr<IAccessibleComparable> comparableObject(IAccessible* accessible)
> {
>     COMPtr<IServiceProvider> serviceProvider(Query, accessible);
>@@ -163,19 +168,19 @@ unsigned AccessibilityUIElement::indexOfChild(AccessibilityUIElement* element)
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::allAttributes()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::allAttributes()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfLinkedUIElements()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfLinkedUIElements()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfDocumentLinks()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfDocumentLinks()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> AccessibilityUIElement AccessibilityUIElement::titleUIElement()
>@@ -216,14 +221,14 @@ AccessibilityUIElement AccessibilityUIElement::parentElement()
>     return parentAccessible;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfChildren()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfChildren()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::parameterizedAttributeNames()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::parameterizedAttributeNames()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> static VARIANT& self()
>@@ -286,14 +291,14 @@ static _bstr_t convertToDRTLabel(const _bstr_t roleName)
>     return roleName;
> }
> 
>-JSStringRef AccessibilityUIElement::role()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::role()
> {
>     if (!m_element)
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXRole: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXRole: "));
> 
>     _variant_t vRole;
>     if (FAILED(m_element->get_accRole(self(), &vRole.GetVARIANT())))
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXRole: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXRole: "));
> 
>     ASSERT(V_VT(&vRole) == VT_I4 || V_VT(&vRole) == VT_BSTR);
> 
>@@ -309,95 +314,95 @@ JSStringRef AccessibilityUIElement::role()
>     } else if (V_VT(&vRole) == VT_BSTR)
>         result = V_BSTR(&vRole);
> 
>-    return JSStringCreateWithBSTR(_bstr_t(L"AXRole: ") + convertToDRTLabel(result));
>+    return adopt(JSStringCreateWithBSTR(_bstr_t(L"AXRole: ") + convertToDRTLabel(result)));
> }
> 
>-JSStringRef AccessibilityUIElement::subrole()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::subrole()
> {
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::roleDescription()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::roleDescription()
> {
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::computedRoleString()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::computedRoleString()
> {
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::title()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::title()
> {
>     if (!m_element)
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXTitle: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXTitle: "));
> 
>     _bstr_t titleBSTR;
>     if (FAILED(m_element->get_accName(self(), &titleBSTR.GetBSTR())))
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXTitle: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXTitle: "));
> 
>-    return JSStringCreateWithBSTR(_bstr_t(L"AXTitle: ") + titleBSTR);
>+    return adopt(JSStringCreateWithBSTR(_bstr_t(L"AXTitle: ") + titleBSTR));
> }
> 
>-JSStringRef AccessibilityUIElement::description()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::description()
> {
>     if (!m_element)
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXDescription: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXDescription: "));
> 
>     _bstr_t descriptionBSTR;
>     if (FAILED(m_element->get_accDescription(self(), &descriptionBSTR.GetBSTR())))
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXDescription: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXDescription: "));
> 
>     if (!descriptionBSTR.length())
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXDescription: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXDescription: "));
> 
>     if (wcsstr(static_cast<wchar_t*>(descriptionBSTR), L"Description: ") == static_cast<wchar_t*>(descriptionBSTR)) {
>         // The Mozilla MSAA implementation requires that the string returned to us be prefixed with "Description: "
>         // To match the Mac test results, we will just prefix with AX -> AXDescription:
>-        return JSStringCreateWithBSTR(_bstr_t(L"AX") + descriptionBSTR);
>+        return adopt(JSStringCreateWithBSTR(_bstr_t(L"AX") + descriptionBSTR));
>     }
> 
>-    return JSStringCreateWithBSTR(descriptionBSTR);
>+    return adopt(JSStringCreateWithBSTR(descriptionBSTR));
> }
> 
>-JSStringRef AccessibilityUIElement::stringValue()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringValue()
> {
>     if (!m_element)
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXValue: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXValue: "));
> 
>     _bstr_t valueBSTR;
>     if (FAILED(m_element->get_accValue(self(), &valueBSTR.GetBSTR())))
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXValue: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXValue: "));
> 
>-    return JSStringCreateWithBSTR(_bstr_t(L"AXValue: ") + valueBSTR);
>+    return adopt(JSStringCreateWithBSTR(_bstr_t(L"AXValue: ") + valueBSTR));
> }
> 
>-JSStringRef AccessibilityUIElement::language()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::language()
> {
>     if (!m_element)
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXLanguage: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXLanguage: "));
> 
>     COMPtr<IAccessibleComparable> accessible2Element = comparableObject(m_element.get());
>     if (!accessible2Element)
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXLanguage: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXLanguage: "));
> 
>     IA2Locale locale;
>     if (FAILED(accessible2Element->get_locale(&locale)))
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXLanguage: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXLanguage: "));
> 
>-    return JSStringCreateWithBSTR(_bstr_t(L"AXLanguage: ") + _bstr_t(locale.language, false));
>+    return adopt(JSStringCreateWithBSTR(_bstr_t(L"AXLanguage: ") + _bstr_t(locale.language, false)));
> }
> 
>-JSStringRef AccessibilityUIElement::helpText() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::helpText() const
> {
>     if (!m_element)
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXHelp: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXHelp: "));
> 
>     _bstr_t helpTextBSTR;
>     if (FAILED(m_element->get_accHelp(self(), &helpTextBSTR.GetBSTR())))
>-        return JSStringCreateWithBSTR(_bstr_t(L"AXHelp: "));
>+        return adopt(JSStringCreateWithUTF8CString("AXHelp: "));
> 
>-    return JSStringCreateWithBSTR(_bstr_t(L"AXHelp: ") + helpTextBSTR);
>+    return adopt(JSStringCreateWithBSTR(_bstr_t(L"AXHelp: ") + helpTextBSTR));
> }
> 
> double AccessibilityUIElement::x()
>@@ -454,7 +459,7 @@ double AccessibilityUIElement::clickPointY()
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::valueDescription()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::valueDescription()
> {
>     return nullptr;
> }
>@@ -494,7 +499,7 @@ bool AccessibilityUIElement::ariaIsGrabbed() const
>     return false;
> }
>  
>-JSStringRef AccessibilityUIElement::ariaDropEffects() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::ariaDropEffects() const
> {
>     return 0;
> }
>@@ -522,7 +527,7 @@ bool AccessibilityUIElement::isIndeterminate() const
>     return false;
> }
> 
>-JSStringRef AccessibilityUIElement::orientation() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::orientation() const
> {
>     return 0;
> }
>@@ -592,34 +597,34 @@ int AccessibilityUIElement::insertionPointLineNumber()
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfColumnHeaders()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumnHeaders()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfRowHeaders()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRowHeaders()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfColumns()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumns()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfRows()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRows()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfVisibleCells()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfVisibleCells()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributesOfHeader()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfHeader()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> int AccessibilityUIElement::indexInTable()
>@@ -627,14 +632,14 @@ int AccessibilityUIElement::indexInTable()
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::rowIndexRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::rowIndexRange()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::columnIndexRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::columnIndexRange()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> int AccessibilityUIElement::lineForIndex(int)
>@@ -642,19 +647,19 @@ int AccessibilityUIElement::lineForIndex(int)
>     return 0;
> }
> 
>-JSStringRef AccessibilityUIElement::boundsForRange(unsigned location, unsigned length)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::boundsForRange(unsigned location, unsigned length)
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::stringForRange(unsigned, unsigned)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForRange(unsigned, unsigned)
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::attributedStringForRange(unsigned, unsigned)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForRange(unsigned, unsigned)
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> bool AccessibilityUIElement::attributedStringRangeIsMisspelled(unsigned, unsigned)
>@@ -672,7 +677,7 @@ AccessibilityUIElement AccessibilityUIElement::uiElementForSearchPredicate(JSCon
>     return { nullptr };
> }
> 
>-JSStringRef AccessibilityUIElement::selectTextWithCriteria(JSContextRef context, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::selectTextWithCriteria(JSContextRef context, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity)
> {
>     return 0;
> }
>@@ -682,28 +687,28 @@ AccessibilityUIElement AccessibilityUIElement::cellForColumnAndRow(unsigned colu
>     return { nullptr };
> }
> 
>-JSStringRef AccessibilityUIElement::selectedTextRange()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::selectedTextRange()
> {
>     COMPtr<IAccessibleComparable> comparable = comparableObject(platformUIElement().get());
>     if (!comparable)
>-        return JSStringCreateWithCharacters(0, 0);
>+        return createEmptyJSString();
> 
>     _variant_t value;
>     if (FAILED(comparable->get_attribute(_bstr_t(L"AXSelectedTextRangeAttribute"), &value.GetVARIANT())))
>-        return JSStringCreateWithCharacters(0, 0);    
>+        return createEmptyJSString();
> 
>     ASSERT(V_VT(&value) == VT_BSTR);
>-    return JSStringCreateWithBSTR(value.bstrVal);
>+    return adopt(JSStringCreateWithBSTR(value.bstrVal));
> }
> 
> void AccessibilityUIElement::setSelectedTextRange(unsigned location, unsigned length)
> {
> }
> 
>-JSStringRef AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
> {
>     // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> double AccessibilityUIElement::numberAttributeValue(JSStringRef attribute)
>@@ -788,16 +793,16 @@ AccessibilityUIElement AccessibilityUIElement::disclosedByRow()
>     return { nullptr };
> }
> 
>-JSStringRef AccessibilityUIElement::accessibilityValue() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::accessibilityValue() const
> {
>     if (!m_element)
>-        return JSStringCreateWithCharacters(0, 0);
>+        return createEmptyJSString();
> 
>     _bstr_t valueBSTR;
>     if (FAILED(m_element->get_accValue(self(), &valueBSTR.GetBSTR())) || !valueBSTR.length())
>-        return JSStringCreateWithCharacters(0, 0);
>+        return createEmptyJSString();
> 
>-    return JSStringCreateWithBSTR(valueBSTR);
>+    return adopt(JSStringCreateWithBSTR(valueBSTR));
> }
> 
> void AccessibilityUIElement::clearSelectedChildren() const
>@@ -805,20 +810,20 @@ void AccessibilityUIElement::clearSelectedChildren() const
>     // FIXME: implement
> }
> 
>-JSStringRef AccessibilityUIElement::documentEncoding()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::documentEncoding()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::documentURI()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::documentURI()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
>-JSStringRef AccessibilityUIElement::url()
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::url()
> {
>     // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> bool AccessibilityUIElement::addNotificationListener(JSObjectRef functionCallback)
>@@ -949,7 +954,7 @@ void AccessibilityUIElement::scrollToGlobalPoint(int x, int y)
>     // FIXME: implement
> }
> 
>-JSStringRef AccessibilityUIElement::classList() const
>+JSRetainPtr<JSStringRef> AccessibilityUIElement::classList() const
> {
>     // FIXME: implement
>     return 0;
>diff --git a/Tools/DumpRenderTree/win/TestRunnerWin.cpp b/Tools/DumpRenderTree/win/TestRunnerWin.cpp
>index c1da919ed7f34dc40b5f36b69748177a26b0fbd6..b0fbe3cf38ef86d9da88d4eff3ff0c7aad59cc6c 100644
>--- a/Tools/DumpRenderTree/win/TestRunnerWin.cpp
>+++ b/Tools/DumpRenderTree/win/TestRunnerWin.cpp
>@@ -210,14 +210,14 @@ void TestRunner::clearBackForwardList()
>     backForwardList->goToItem(item.get());
> }
> 
>-JSStringRef TestRunner::copyDecodedHostName(JSStringRef name)
>+JSRetainPtr<JSStringRef> TestRunner::copyDecodedHostName(JSStringRef name)
> {
>     // FIXME: Implement!
>     fprintf(testResult, "ERROR: TestRunner::copyDecodedHostName(JSStringRef) not implemented\n");
>     return 0;
> }
> 
>-JSStringRef TestRunner::copyEncodedHostName(JSStringRef name)
>+JSRetainPtr<JSStringRef> TestRunner::copyEncodedHostName(JSStringRef name)
> {
>     // FIXME: Implement!
>     fprintf(testResult, "ERROR: TestRunner::copyEncodedHostName(JSStringRef) not implemented\n");
>@@ -311,7 +311,7 @@ static wstring jsStringRefToWString(JSStringRef jsStr)
>     return buffer.data();
> }
> 
>-JSStringRef TestRunner::pathToLocalResource(JSContextRef context, JSStringRef url)
>+JSRetainPtr<JSStringRef> TestRunner::pathToLocalResource(JSContextRef context, JSStringRef url)
> {
>     wstring input(JSStringGetCharactersPtr(url), JSStringGetLength(url));
> 
>@@ -321,7 +321,7 @@ JSStringRef TestRunner::pathToLocalResource(JSContextRef context, JSStringRef ur
>         return nullptr;
>     }
> 
>-    return JSStringCreateWithCharacters(localPath.c_str(), localPath.length());
>+    return adopt(JSStringCreateWithCharacters(localPath.c_str(), localPath.length()));
> }
> 
> void TestRunner::queueLoad(JSStringRef url, JSStringRef target)
>@@ -346,7 +346,7 @@ void TestRunner::queueLoad(JSStringRef url, JSStringRef target)
> 
>     wstring wURL = jsStringRefToWString(url);
>     wstring wAbsoluteURL = responseURL + TEXT("/") + wURL;
>-    JSRetainPtr<JSStringRef> jsAbsoluteURL(Adopt, JSStringCreateWithCharacters(wAbsoluteURL.data(), wAbsoluteURL.length()));
>+    auto jsAbsoluteURL = adopt(JSStringCreateWithCharacters(wAbsoluteURL.data(), wAbsoluteURL.length()));
> 
>     WorkQueue::singleton().queue(new LoadItem(jsAbsoluteURL.get(), target));
> }
>@@ -991,7 +991,7 @@ bool TestRunner::findString(JSContextRef context, JSStringRef target, JSObjectRe
> 
>     unsigned char options = 0;
> 
>-    JSRetainPtr<JSStringRef> lengthPropertyName(Adopt, JSStringCreateWithUTF8CString("length"));
>+    auto lengthPropertyName = adopt(JSStringCreateWithUTF8CString("length"));
>     JSValueRef lengthValue = JSObjectGetProperty(context, optionsArray, lengthPropertyName.get(), nullptr);
>     if (!JSValueIsNumber(context, lengthValue))
>         return false;
>@@ -1004,7 +1004,7 @@ bool TestRunner::findString(JSContextRef context, JSStringRef target, JSObjectRe
>         if (!JSValueIsString(context, value))
>             continue;
> 
>-        JSRetainPtr<JSStringRef> optionName(Adopt, JSValueToStringCopy(context, value, nullptr));
>+        auto optionName = adopt(JSValueToStringCopy(context, value, nullptr));
> 
>         if (JSStringIsEqualToUTF8CString(optionName.get(), "CaseInsensitive"))
>             options |= WebFindOptionsCaseInsensitive;
>@@ -1185,7 +1185,7 @@ void TestRunner::evaluateInWebInspector(JSStringRef script)
>     inspectorPrivate->evaluateInFrontend(bstrT(script).GetBSTR());
> }
> 
>-JSStringRef TestRunner::inspectorTestStubURL()
>+JSRetainPtr<JSStringRef> TestRunner::inspectorTestStubURL()
> {
>     CFBundleRef webkitBundle = webKitBundle();
>     if (!webkitBundle)
>@@ -1195,7 +1195,7 @@ JSStringRef TestRunner::inspectorTestStubURL()
>     if (!url)
>         return nullptr;
> 
>-    return JSStringCreateWithCFString(CFURLGetString(url.get()));
>+    return adopt(JSStringCreateWithCFString(CFURLGetString(url.get())));
> }
> 
> typedef HashMap<unsigned, COMPtr<IWebScriptWorld> > WorldMap;
>diff --git a/Tools/TestRunnerShared/Bindings/JSWrapper.h b/Tools/TestRunnerShared/Bindings/JSWrapper.h
>index 081adbf6f9e2cd4d2d6a1939785165a3daae104a..778a30ec58fedb035ad60e7cf81efc0080d10cf5 100644
>--- a/Tools/TestRunnerShared/Bindings/JSWrapper.h
>+++ b/Tools/TestRunnerShared/Bindings/JSWrapper.h
>@@ -23,8 +23,7 @@
>  * THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
>-#ifndef JSWrapper_h
>-#define JSWrapper_h
>+#pragma once
> 
> #include "JSWrappable.h"
> #include <JavaScriptCore/JSRetainPtr.h>
>@@ -48,10 +47,8 @@ inline JSValueRef toJS(JSContextRef context, JSWrappable* impl)
> 
> inline void setProperty(JSContextRef context, JSObjectRef object, const char* propertyName, JSWrappable* value, JSPropertyAttributes attributes, JSValueRef* exception)
> {
>-    JSRetainPtr<JSStringRef> propertyNameString(Adopt, JSStringCreateWithUTF8CString(propertyName));
>+    auto propertyNameString = adopt(JSStringCreateWithUTF8CString(propertyName));
>     JSObjectSetProperty(context, object, propertyNameString.get(), JSWrapper::wrap(context, value), attributes, exception);
> }
> 
> } // namespace WTR
>-
>-#endif // JSWrapper_h
>diff --git a/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp b/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp
>index 44c558e5769301aff6bb1b12ba5fcccc946a9b20..5a84da8387ae99b54e17b85883ab723b29cfd760 100644
>--- a/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp
>+++ b/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp
>@@ -39,7 +39,7 @@ static inline bool isPersistentCallbackID(unsigned callbackID)
> }
> 
> UIScriptContext::UIScriptContext(UIScriptContextDelegate& delegate)
>-    : m_context(Adopt, JSGlobalContextCreate(nullptr))
>+    : m_context(adopt(JSGlobalContextCreate(nullptr)))
>     , m_delegate(delegate)
> {
>     m_controller = UIScriptController::create(*this);
>@@ -60,14 +60,14 @@ void UIScriptContext::runUIScript(const String& script, unsigned scriptCallbackI
> {
>     m_currentScriptCallbackID = scriptCallbackID;
> 
>-    JSRetainPtr<JSStringRef> stringRef(Adopt, JSStringCreateWithUTF8CString(script.utf8().data()));
>+    auto stringRef = adopt(JSStringCreateWithUTF8CString(script.utf8().data()));
> 
>     JSValueRef exception = nullptr;
>     JSValueRef result = JSEvaluateScript(m_context.get(), stringRef.get(), 0, 0, 1, &exception);
>     
>     if (!hasOutstandingAsyncTasks()) {
>         JSValueRef stringifyException = nullptr;
>-        JSRetainPtr<JSStringRef> stringified(Adopt, JSValueToStringCopy(m_context.get(), result, &stringifyException));
>+        auto stringified = adopt(JSValueToStringCopy(m_context.get(), result, &stringifyException));
>         requestUIScriptCompletion(stringified.get());
>         tryToCompleteUIScriptForCurrentParentCallback();
>     }
>diff --git a/Tools/TestRunnerShared/UIScriptContext/UIScriptController.cpp b/Tools/TestRunnerShared/UIScriptContext/UIScriptController.cpp
>index b7c16f58117b00d00713a16001aa0bf01d908dd2..ae99048f91da45aad84183b20e6bc7dc93033d22 100644
>--- a/Tools/TestRunnerShared/UIScriptContext/UIScriptController.cpp
>+++ b/Tools/TestRunnerShared/UIScriptContext/UIScriptController.cpp
>@@ -42,7 +42,7 @@ DeviceOrientation* toDeviceOrientation(JSContextRef context, JSValueRef value)
>         DeviceOrientation::LandscapeRight
>     };
> 
>-    JSRetainPtr<JSStringRef> option(Adopt, JSValueToStringCopy(context, value, nullptr));
>+    auto option = adopt(JSValueToStringCopy(context, value, nullptr));
>     if (option.get()->string() == "portrait")
>         return &values[0];
>         
>diff --git a/Tools/TestRunnerShared/cocoa/LayoutTestSpellChecker.mm b/Tools/TestRunnerShared/cocoa/LayoutTestSpellChecker.mm
>index 231ab5528e4d95526f71acbac6e892e1c7ab7e43..8d83d8c407fcc7f1f659dad1b39987c070c32a7d 100644
>--- a/Tools/TestRunnerShared/cocoa/LayoutTestSpellChecker.mm
>+++ b/Tools/TestRunnerShared/cocoa/LayoutTestSpellChecker.mm
>@@ -68,9 +68,9 @@ static const char *stringForCorrectionResponse(NSCorrectionResponse correctionRe
>     return "invalid";
> }
> 
>-static NSTextCheckingType nsTextCheckingType(JSRetainPtr<JSStringRef>&& jsType)
>+static NSTextCheckingType nsTextCheckingType(JSStringRef jsType)
> {
>-    auto cfType = adoptCF(JSStringCopyCFString(kCFAllocatorDefault, jsType.get()));
>+    auto cfType = adoptCF(JSStringCopyCFString(kCFAllocatorDefault, jsType));
>     if (CFStringCompare(cfType.get(), CFSTR("orthography"), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
>         return NSTextCheckingTypeOrthography;
> 
>@@ -251,7 +251,7 @@ - (void)setResultsFromJSObject:(JSObjectRef)resultsObject inContext:(JSContextRe
>                 }
>                 JSPropertyNameArrayRelease(detailsObjectProperties);
>             }
>-            [resultsForWord addObject:[[[LayoutTestTextCheckingResult alloc] initWithType:nsTextCheckingType(WTFMove(typeValue)) range:NSMakeRange(fromValue, toValue - fromValue) replacement:(__bridge NSString *)replacementText.get() details:details.get()] autorelease]];
>+            [resultsForWord addObject:[[[LayoutTestTextCheckingResult alloc] initWithType:nsTextCheckingType(typeValue.get()) range:NSMakeRange(fromValue, toValue - fromValue) replacement:(__bridge NSString *)replacementText.get() details:details.get()] autorelease]];
>         }
>         auto cfTextToCheck = adoptCF(JSStringCopyCFString(kCFAllocatorDefault, textToCheck));
>         [results setObject:resultsForWord.get() forKey:(__bridge NSString *)cfTextToCheck.get()];
>diff --git a/Tools/TestWebKitAPI/JavaScriptTest.cpp b/Tools/TestWebKitAPI/JavaScriptTest.cpp
>index 133d99eeec92182d38b8fa61d188400e8e476bb2..2136e98d8ebb875d597fc6e07c7b01ed5b84ae16 100644
>--- a/Tools/TestWebKitAPI/JavaScriptTest.cpp
>+++ b/Tools/TestWebKitAPI/JavaScriptTest.cpp
>@@ -58,7 +58,7 @@ static void javaScriptCallback(WKSerializedScriptValueRef resultSerializedScript
>     JSValueRef scriptValue = WKSerializedScriptValueDeserialize(resultSerializedScriptValue, scriptContext, 0);
>     ASSERT_NOT_NULL(scriptValue);
> 
>-    context->actualString.adopt(JSValueToStringCopy(scriptContext, scriptValue, 0));
>+    context->actualString = adopt(JSValueToStringCopy(scriptContext, scriptValue, 0));
>     ASSERT_NOT_NULL(context->actualString.get());
> 
>     context->didFinish = true;
>diff --git a/Tools/TestWebKitAPI/Tests/WebKit/WKPageIsPlayingAudio.cpp b/Tools/TestWebKitAPI/Tests/WebKit/WKPageIsPlayingAudio.cpp
>index c4eb1e91c1b7d4bd19665f30fd51709741b2463f..7010f38f63136ab177ec7c0b1a64e5a61590a4df 100644
>--- a/Tools/TestWebKitAPI/Tests/WebKit/WKPageIsPlayingAudio.cpp
>+++ b/Tools/TestWebKitAPI/Tests/WebKit/WKPageIsPlayingAudio.cpp
>@@ -30,7 +30,6 @@
> #include "PlatformUtilities.h"
> #include "PlatformWebView.h"
> #include "Test.h"
>-#include <JavaScriptCore/JSRetainPtr.h>
> #include <JavaScriptCore/JavaScriptCore.h>
> #include <WebKit/WKSerializedScriptValue.h>
> #include <WebKit/WKPagePrivate.h>
>diff --git a/Tools/TestWebKitAPI/Tests/WebKitCocoa/PictureInPictureDelegate.mm b/Tools/TestWebKitAPI/Tests/WebKitCocoa/PictureInPictureDelegate.mm
>index 8b345d7f797ed357d86b74e25b78e0d37d4156ec..00e1a8cf01155dcc94fe5e1e025b702e9a1c2dad 100644
>--- a/Tools/TestWebKitAPI/Tests/WebKitCocoa/PictureInPictureDelegate.mm
>+++ b/Tools/TestWebKitAPI/Tests/WebKitCocoa/PictureInPictureDelegate.mm
>@@ -31,7 +31,6 @@
> #import "PlatformWebView.h"
> #import "Test.h"
> #import "TestWKWebView.h"
>-#import <JavaScriptCore/JSRetainPtr.h>
> #import <JavaScriptCore/JavaScriptCore.h>
> #import <WebKit/WKPagePrivateMac.h>
> #import <WebKit/WKPreferencesPrivate.h>
>diff --git a/Tools/TestWebKitAPI/Tests/mac/DOMNodeFromJSObject.mm b/Tools/TestWebKitAPI/Tests/mac/DOMNodeFromJSObject.mm
>index f5c83df33fc3f35d52c0366234ddb33815734042..2b119b87f49a49c32d72fece8d723bf3852ea559 100644
>--- a/Tools/TestWebKitAPI/Tests/mac/DOMNodeFromJSObject.mm
>+++ b/Tools/TestWebKitAPI/Tests/mac/DOMNodeFromJSObject.mm
>@@ -42,7 +42,7 @@ TEST(WebKitLegacy, DOMNodeFromJSObject)
>     WebScriptWorld *isolatedWorld = [WebScriptWorld world];
>     JSGlobalContextRef context = [[webView mainFrame] _globalContextForScriptWorld:isolatedWorld];
> 
>-    JSRetainPtr<JSStringRef> script(Adopt, JSStringCreateWithUTF8CString("document.body"));
>+    auto script = adopt(JSStringCreateWithUTF8CString("document.body"));
> 
>     JSValueRef value = JSEvaluateScript(context, script.get(), 0, 0, 0, 0);
>     JSObjectRef jsBody = JSValueToObject(context, value, 0);
>diff --git a/Tools/TestWebKitAPI/Tests/mac/JSWrapperForNodeInWebFrame.mm b/Tools/TestWebKitAPI/Tests/mac/JSWrapperForNodeInWebFrame.mm
>index 69fb5921880b48a2c8c4c0036e93e46e183baf2c..ef4a63e80e2bd3ee6990d12ec8262f23275b61fd 100644
>--- a/Tools/TestWebKitAPI/Tests/mac/JSWrapperForNodeInWebFrame.mm
>+++ b/Tools/TestWebKitAPI/Tests/mac/JSWrapperForNodeInWebFrame.mm
>@@ -80,13 +80,15 @@ TEST(WebKitLegacy, JSWrapperForNode)
>     ASSERT_TRUE(JSValueIsObject(normalCtx, normalNodeJSValue));
>     JSObjectRef normalNodeJSObject = JSValueToObject(normalCtx, normalNodeJSValue, 0);
> 
>-    JSRetainPtr<JSStringRef> isolatedPropertyJSString = JSStringCreateWithUTF8CString("isolatedProperty");
>+    auto isolatedPropertyJSString = adopt(JSStringCreateWithUTF8CString("isolatedProperty"));
>+
>     // Test for successful retrieval of the first property in the isolated script world
>     EXPECT_TRUE(JSValueIsBoolean(isolatedCtx, JSObjectGetProperty(isolatedCtx, isolatedNodeJSObject, isolatedPropertyJSString.get(), 0)));
>     // Test for failed retrieval of the first property in the standard script world
>     EXPECT_TRUE(JSValueIsUndefined(normalCtx, JSObjectGetProperty(normalCtx, normalNodeJSObject, isolatedPropertyJSString.get(), 0)));
> 
>-    JSRetainPtr<JSStringRef> normalPropertyJSString = JSStringCreateWithUTF8CString("normalProperty");
>+    auto normalPropertyJSString = adopt(JSStringCreateWithUTF8CString("normalProperty"));
>+
>     // Test for successful retrieval of the second property in the standard script world
>     EXPECT_TRUE(JSValueIsBoolean(normalCtx, JSObjectGetProperty(normalCtx, normalNodeJSObject, normalPropertyJSString.get(), 0)));
>     // Test for failed retrieval of the second property in the isolated script world
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityController.cpp b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityController.cpp
>index d07904b33f4811fbd1fad3b6c21391e40e6a7177..7b816764224d92f945404fda6ce71b00be039575 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityController.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityController.cpp
>@@ -31,7 +31,6 @@
> #include "InjectedBundlePage.h"
> #include "JSAccessibilityController.h"
> 
>-#include <JavaScriptCore/JSRetainPtr.h>
> #include <WebKit/WKBundle.h>
> #include <WebKit/WKBundlePage.h>
> #include <WebKit/WKBundlePagePrivate.h>
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarker.cpp b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarker.cpp
>index 7e99fbb127e8a7b59d04e791b4ab43f20404cd54..65336041dc07226fa50fdc83726df01552076de5 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarker.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarker.cpp
>@@ -29,8 +29,6 @@
> #include "AccessibilityUIElement.h"
> #include "JSAccessibilityTextMarker.h"
> 
>-#include <JavaScriptCore/JSRetainPtr.h>
>-
> namespace WTR {
>     
> Ref<AccessibilityTextMarker> AccessibilityTextMarker::create(PlatformTextMarker marker)
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarkerRange.cpp b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarkerRange.cpp
>index 7444f35222ea1c587b428e83f830ae1eadc7af8b..2b21e8a8801868d99179a76d7381d711282fdf23 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarkerRange.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityTextMarkerRange.cpp
>@@ -29,8 +29,6 @@
> #include "AccessibilityUIElement.h"
> #include "JSAccessibilityTextMarkerRange.h"
> 
>-#include <JavaScriptCore/JSRetainPtr.h>
>-
> namespace WTR {
>     
> Ref<AccessibilityTextMarkerRange> AccessibilityTextMarkerRange::create(PlatformTextMarkerRange markerRange)
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityUIElement.cpp b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityUIElement.cpp
>index e6195559a72ce1e23d67e2909475fff118f6d5c9..499cbe9c46f89f65693dfafc3836f66b10cf2b5b 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/AccessibilityUIElement.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/AccessibilityUIElement.cpp
>@@ -27,7 +27,6 @@
> #include "AccessibilityUIElement.h"
> 
> #include "JSAccessibilityUIElement.h"
>-#include <JavaScriptCore/JSRetainPtr.h>
> 
> namespace WTR {
> 
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/Bindings/CodeGeneratorTestRunner.pm b/Tools/WebKitTestRunner/InjectedBundle/Bindings/CodeGeneratorTestRunner.pm
>index 8591954b51a4ee13d2b3054b62f943aa3d3fb381..d6a638e18756db231f3e65691aa45fadd8df75e6 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/Bindings/CodeGeneratorTestRunner.pm
>+++ b/Tools/WebKitTestRunner/InjectedBundle/Bindings/CodeGeneratorTestRunner.pm
>@@ -448,8 +448,8 @@ sub _platformTypeConstructor
>     return "JSValueToNullableBoolean(context, $argumentName)" if $type->name eq "boolean" && $type->isNullable;
>     return "JSValueToBoolean(context, $argumentName)" if $type->name eq "boolean";
>     return "$argumentName" if $type->name eq "object";
>-    return "JSRetainPtr<JSStringRef>(Adopt, JSValueToStringCopy(context, $argumentName, 0))" if $$self{codeGenerator}->IsStringType($type);
>-    return "JSValueToNumber(context, $argumentName, 0)" if $$self{codeGenerator}->IsPrimitiveType($type);
>+    return "adopt(JSValueToStringCopy(context, $argumentName, nullptr))" if $$self{codeGenerator}->IsStringType($type);
>+    return "JSValueToNumber(context, $argumentName, nullptr)" if $$self{codeGenerator}->IsPrimitiveType($type);
>     return "to" . _implementationClassName($type) . "(context, $argumentName)";
> }
> 
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/EventSendingController.cpp b/Tools/WebKitTestRunner/InjectedBundle/EventSendingController.cpp
>index 76384d5e421def46670380811d5d91874ab5735e..25cfcbb0542b9eab9d93f1de11a6c6609a4b9594 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/EventSendingController.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/EventSendingController.cpp
>@@ -130,7 +130,7 @@ static WKEventModifiers parseModifier(JSStringRef modifier)
> 
> static unsigned arrayLength(JSContextRef context, JSObjectRef array)
> {
>-    JSRetainPtr<JSStringRef> lengthString(Adopt, JSStringCreateWithUTF8CString("length"));
>+    auto lengthString = adopt(JSStringCreateWithUTF8CString("length"));
>     JSValueRef lengthValue = JSObjectGetProperty(context, array, lengthString.get(), 0);
>     if (!lengthValue)
>         return 0;
>@@ -144,7 +144,7 @@ static WKEventModifiers parseModifierArray(JSContextRef context, JSValueRef arra
> 
>     // The value may either be a string with a single modifier or an array of modifiers.
>     if (JSValueIsString(context, arrayValue)) {
>-        JSRetainPtr<JSStringRef> string(Adopt, JSValueToStringCopy(context, arrayValue, 0));
>+        auto string = adopt(JSValueToStringCopy(context, arrayValue, 0));
>         return parseModifier(string.get());
>     }
> 
>@@ -158,7 +158,7 @@ static WKEventModifiers parseModifierArray(JSContextRef context, JSValueRef arra
>         JSValueRef value = JSObjectGetPropertyAtIndex(context, array, i, &exception);
>         if (exception)
>             continue;
>-        JSRetainPtr<JSStringRef> string(Adopt, JSValueToStringCopy(context, value, &exception));
>+        auto string = adopt(JSValueToStringCopy(context, value, &exception));
>         if (exception)
>             continue;
>         modifiers |= parseModifier(string.get());
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp b/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp
>index 26efa88ed5f5bf5514d13b7bb26ef6097a000ea9..5576a98dc0b540ca99889ef53c1dcfba135ab956 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp
>@@ -67,7 +67,7 @@ static JSValueRef propertyValue(JSContextRef context, JSObjectRef object, const
> {
>     if (!object)
>         return 0;
>-    JSRetainPtr<JSStringRef> propertyNameString(Adopt, JSStringCreateWithUTF8CString(propertyName));
>+    auto propertyNameString = adopt(JSStringCreateWithUTF8CString(propertyName));
>     return JSObjectGetProperty(context, object, propertyNameString.get(), 0);
> }
> 
>@@ -93,7 +93,7 @@ static double numericWindowPropertyValue(WKBundleFrameRef frame, const char* pro
> static WTF::String dumpPath(JSGlobalContextRef context, JSObjectRef nodeValue)
> {
>     JSValueRef nodeNameValue = propertyValue(context, nodeValue, "nodeName");
>-    JSRetainPtr<JSStringRef> jsStringNodeName(Adopt, JSValueToStringCopy(context, nodeNameValue, 0));
>+    auto jsStringNodeName = adopt(JSValueToStringCopy(context, nodeNameValue, 0));
>     WKRetainPtr<WKStringRef> nodeName = toWK(jsStringNodeName);
> 
>     JSValueRef parentNode = propertyValue(context, nodeValue, "parentNode");
>@@ -818,7 +818,7 @@ void InjectedBundlePage::dumpAllFrameScrollPositions(StringBuilder& stringBuilde
> 
> static JSRetainPtr<JSStringRef> toJS(const char* string)
> {
>-    return JSRetainPtr<JSStringRef>(Adopt, JSStringCreateWithUTF8CString(string));
>+    return adopt(JSStringCreateWithUTF8CString(string));
> }
> 
> static bool hasDocumentElement(WKBundleFrameRef frame)
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/TestRunner.cpp b/Tools/WebKitTestRunner/InjectedBundle/TestRunner.cpp
>index a3ed22b869444214f98435027db8526fb0fc5f04..f70ee1311514194e65578da968d5d7c258cfd1aa 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/TestRunner.cpp
>+++ b/Tools/WebKitTestRunner/InjectedBundle/TestRunner.cpp
>@@ -306,7 +306,7 @@ bool TestRunner::findString(JSStringRef target, JSValueRef optionsArrayAsValue)
>     auto& injectedBundle = InjectedBundle::singleton();
>     WKBundleFrameRef mainFrame = WKBundlePageGetMainFrame(injectedBundle.page()->page());
>     JSContextRef context = WKBundleFrameGetJavaScriptContext(mainFrame);
>-    JSRetainPtr<JSStringRef> lengthPropertyName(Adopt, JSStringCreateWithUTF8CString("length"));
>+    auto lengthPropertyName = adopt(JSStringCreateWithUTF8CString("length"));
>     JSObjectRef optionsArray = JSValueToObject(context, optionsArrayAsValue, 0);
>     JSValueRef lengthValue = JSObjectGetProperty(context, optionsArray, lengthPropertyName.get(), 0);
>     if (!JSValueIsNumber(context, lengthValue))
>@@ -318,7 +318,7 @@ bool TestRunner::findString(JSStringRef target, JSValueRef optionsArrayAsValue)
>         if (!JSValueIsString(context, value))
>             continue;
> 
>-        JSRetainPtr<JSStringRef> optionName(Adopt, JSValueToStringCopy(context, value, 0));
>+        auto optionName = adopt(JSValueToStringCopy(context, value, 0));
> 
>         if (JSStringIsEqualToUTF8CString(optionName.get(), "CaseInsensitive"))
>             options |= kWKFindOptionsCaseInsensitive;
>@@ -1836,8 +1836,8 @@ void TestRunner::statisticsDidRunTelemetryCallback(unsigned totalPrevalentResour
>     stringBuilder.appendNumber(top3SubframeUnderTopFrameOrigins);
>     stringBuilder.appendLiteral(" }");
>     
>-    JSValueRef result = JSValueMakeFromJSONString(context, JSStringCreateWithUTF8CString(stringBuilder.toString().utf8().data()));
>-    
>+    JSValueRef result = JSValueMakeFromJSONString(context, adopt(JSStringCreateWithUTF8CString(stringBuilder.toString().utf8().data())).get());
>+
>     callTestRunnerCallback(StatisticsDidRunTelemetryCallbackID, 1, &result);
> }
> 
>@@ -2029,7 +2029,7 @@ void TestRunner::callDidReceiveAllStorageAccessEntriesCallback(Vector<String>& d
>     }
>     stringBuilder.appendLiteral("]");
>     
>-    JSValueRef result = JSValueMakeFromJSONString(context, JSStringCreateWithUTF8CString(stringBuilder.toString().utf8().data()));
>+    JSValueRef result = JSValueMakeFromJSONString(context, adopt(JSStringCreateWithUTF8CString(stringBuilder.toString().utf8().data())).get());
> 
>     callTestRunnerCallback(AllStorageAccessEntriesCallbackID, 1, &result);
> }
>@@ -2239,7 +2239,7 @@ void TestRunner::setOpenPanelFiles(JSValueRef filesValue)
>         return;
> 
>     JSObjectRef files = JSValueToObject(context, filesValue, nullptr);
>-    static auto lengthProperty = JSRetainPtr<JSStringRef>(Adopt, JSStringCreateWithUTF8CString("length"));
>+    static auto lengthProperty = adopt(JSStringCreateWithUTF8CString("length"));
>     JSValueRef filesLengthValue = JSObjectGetProperty(context, files, lengthProperty.get(), nullptr);
>     if (!JSValueIsNumber(context, filesLengthValue))
>         return;
>@@ -2251,7 +2251,7 @@ void TestRunner::setOpenPanelFiles(JSValueRef filesValue)
>         if (!JSValueIsString(context, fileValue))
>             continue;
> 
>-        auto file = JSRetainPtr<JSStringRef>(Adopt, JSValueToStringCopy(context, fileValue, nullptr));
>+        auto file = adopt(JSValueToStringCopy(context, fileValue, nullptr));
>         size_t fileBufferSize = JSStringGetMaximumUTF8CStringSize(file.get()) + 1;
>         auto fileBuffer = std::make_unique<char[]>(fileBufferSize);
>         JSStringGetUTF8CString(file.get(), fileBuffer.get(), fileBufferSize);
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityControllerIOS.mm b/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityControllerIOS.mm
>index 09fa2bceb9ac4abc17c3df55fbf696945cba821a..87ccd21ca9a77aa2d0a21a4cab521caeefa9c4a2 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityControllerIOS.mm
>+++ b/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityControllerIOS.mm
>@@ -30,8 +30,6 @@
> #import "InjectedBundle.h"
> #import "InjectedBundlePage.h"
> 
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <UIKit/UIAccessibility.h>
> #import <WebKit/WKBundle.h>
>@@ -64,8 +62,7 @@ bool AccessibilityController::removeNotificationListener()
> 
> JSRetainPtr<JSStringRef> AccessibilityController::platformName()
> {
>-    JSRetainPtr<JSStringRef> platformName(Adopt, JSStringCreateWithUTF8CString("ios"));
>-    return platformName;
>+    return adopt(JSStringCreateWithUTF8CString("ios"));
> }
> 
> void AccessibilityController::resetToConsistentState()
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityUIElementIOS.mm b/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityUIElementIOS.mm
>index c5e5e6c032e29c4cf1c4282d4e4969820a1d2ce7..a6e1f868d73aee9456cfdf5da5e967fcac522a28 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityUIElementIOS.mm
>+++ b/Tools/WebKitTestRunner/InjectedBundle/ios/AccessibilityUIElementIOS.mm
>@@ -30,8 +30,6 @@
> #import "InjectedBundle.h"
> #import "InjectedBundlePage.h"
> #import <Foundation/Foundation.h>
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <UIKit/UIKit.h>
> #import <WebCore/TextGranularity.h>
>@@ -112,15 +110,20 @@ + (NSString *)stringWithJSStringRef:(JSStringRef)jsStringRef
>     return CFBridgingRelease(JSStringCopyCFString(kCFAllocatorDefault, jsStringRef));
> }
> 
>-- (JSStringRef)createJSStringRef
>+- (JSRetainPtr<JSStringRef>)createJSStringRef
> {
>-    return JSStringCreateWithCFString((__bridge CFStringRef)self);
>+    return adopt(JSStringCreateWithCFString((__bridge CFStringRef)self));
> }
> 
> @end
> 
> namespace WTR {
> 
>+static JSRetainPtr<JSStringRef> createEmptyJSString()
>+{
>+    return adopt(JSStringCreateWithCharacters(nullptr, 0));
>+}
>+
> static void convertNSArrayToVector(NSArray* array, Vector<RefPtr<AccessibilityUIElement> >& elementVector)
> {
>     NSUInteger count = [array count];
>@@ -128,18 +131,18 @@ static void convertNSArrayToVector(NSArray* array, Vector<RefPtr<AccessibilityUI
>         elementVector.append(AccessibilityUIElement::create([array objectAtIndex:i]));
> }    
> 
>-static JSStringRef concatenateAttributeAndValue(NSString* attribute, NSString* value)
>+static JSRetainPtr<JSStringRef> concatenateAttributeAndValue(NSString *attribute, NSString *value)
> {
>     Vector<UniChar> buffer([attribute length]);
>     [attribute getCharacters:buffer.data()];
>     buffer.append(':');
>     buffer.append(' ');
>-    
>+
>     Vector<UniChar> valueBuffer([value length]);
>     [value getCharacters:valueBuffer.data()];
>     buffer.appendVector(valueBuffer);
>-    
>-    return JSStringCreateWithCharacters(buffer.data(), buffer.size());
>+
>+    return adopt(JSStringCreateWithCharacters(buffer.data(), buffer.size()));
> }
>     
> AccessibilityUIElement::AccessibilityUIElement(PlatformUIElement element)
>@@ -326,22 +329,22 @@ RefPtr<AccessibilityUIElement> AccessibilityUIElement::disclosedByRow()
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfLinkedUIElements()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfDocumentLinks()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfChildren()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::allAttributes()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::stringAttributeValue(JSStringRef attribute)
>@@ -364,7 +367,7 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::stringAttributeValue(JSStringRe
>         return [rectStr createJSStringRef];
>     }
> 
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> double AccessibilityUIElement::numberAttributeValue(JSStringRef attribute)
>@@ -425,33 +428,33 @@ bool AccessibilityUIElement::isAttributeSupported(JSStringRef attribute)
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::parameterizedAttributeNames()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::role()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::subrole()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::roleDescription()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::computedRoleString()
> {
>     // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::title()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::description()
>@@ -461,7 +464,7 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::description()
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::orientation() const
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::stringValue()
>@@ -471,7 +474,7 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::stringValue()
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::language()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::helpText() const
>@@ -531,7 +534,7 @@ double AccessibilityUIElement::maxValue()
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::valueDescription()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> int AccessibilityUIElement::insertionPointLineNumber()
>@@ -620,7 +623,7 @@ bool AccessibilityUIElement::ariaIsGrabbed() const
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::ariaDropEffects() const
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> // parameterized attributes
>@@ -641,24 +644,18 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::rangeForPosition(int x, int y)
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::boundsForRange(unsigned location, unsigned length)
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForRange(unsigned location, unsigned length)
> {
>     NSString *stringForRange = [m_element stringForRange:NSMakeRange(location, length)];
>-    if (!stringForRange)
>-        return nullptr;
>-    
>     return [stringForRange createJSStringRef];
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributedStringForRange(unsigned location, unsigned length)
> {
>     NSAttributedString *stringForRange = [m_element attributedStringForRange:NSMakeRange(location, length)];
>-    if (!stringForRange)
>-        return nullptr;
>-    
>     return [[stringForRange description] createJSStringRef];
> }
> 
>@@ -701,32 +698,32 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::selectTextWithCriteria(JSContex
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumnHeaders()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRowHeaders()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfColumns()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfRows()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfVisibleCells()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::attributesOfHeader()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::traits()
>@@ -822,7 +819,7 @@ void AccessibilityUIElement::scrollToMakeVisibleWithSubFocus(int x, int y, int w
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::selectedTextRange()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> bool AccessibilityUIElement::setSelectedVisibleTextRange(AccessibilityTextMarkerRange*)
>@@ -879,17 +876,17 @@ void AccessibilityUIElement::clearSelectedChildren() const
> JSRetainPtr<JSStringRef> AccessibilityUIElement::accessibilityValue() const
> {
>     // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::documentEncoding()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::documentURI()
> {
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> void AccessibilityUIElement::assistiveTechnologySimulatedFocus()
>@@ -929,9 +926,6 @@ void AccessibilityUIElement::decreaseTextSelection()
> JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForSelection()
> {
>     NSString *stringForRange = [m_element selectionRangeString];
>-    if (!stringForRange)
>-        return nullptr;
>-    
>     return [stringForRange createJSStringRef];
> }
>     
>@@ -1099,7 +1093,7 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::stringForTextMarkerRange(Access
> {
>     id textMarkers = (id)markerRange->platformTextMarkerRange();
>     if (!textMarkers || ![textMarkers isKindOfClass:[NSArray class]])
>-        return JSStringCreateWithCharacters(0, 0);
>+        return createEmptyJSString();
>     return [[m_element stringForTextMarkers:textMarkers] createJSStringRef];
> }
> 
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.h b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.h
>index 16ca3dd1d858877fb6aff3d60818262ca853ac17..f2f05fb8947819cb199e838930fea6a0b50f29cc 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.h
>+++ b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.h
>@@ -28,22 +28,19 @@
>  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
>-#ifndef AccessibilityCommonMac_h
>-#define AccessibilityCommonMac_h
>+#pragma once
> 
> #import "AccessibilityUIElement.h"
>-
>-#import <JavaScriptCore/JSStringRef.h>
>+#import <JavaScriptCore/JSRetainPtr.h>
> 
> // If an unsupported attribute is passed in, it will raise an accessibility exception. These are usually caught by the Accessibility Runtime to inform
> // the AX client app of the error. However, DRT is the AX client app, so it must catch these exceptions.
> #define BEGIN_AX_OBJC_EXCEPTIONS @try {
> #define END_AX_OBJC_EXCEPTIONS } @catch(NSException *e) { if (![[e name] isEqualToString:NSAccessibilityException]) @throw; }
> 
>-
> @interface NSString (JSStringRefAdditions)
> + (NSString *)stringWithJSStringRef:(JSStringRef)jsStringRef;
>-- (JSStringRef)createJSStringRef;
>+- (JSRetainPtr<JSStringRef>)createJSStringRef;
> @end
> 
> namespace WTR {
>@@ -51,5 +48,3 @@ namespace WTR {
> extern NSDictionary *searchPredicateParameterizedAttributeForSearchCriteria(JSContextRef, AccessibilityUIElement *startElement, bool isDirectionNext, unsigned resultsLimit, JSValueRef searchKey, JSStringRef searchText, bool visibleOnly, bool immediateDescendantsOnly);
> 
> };
>-
>-#endif // AccessibilityCommonMac_h
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.mm b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.mm
>index 9ea64322d112206d2918ab447cb369ac2584ea2f..cf778c6e1d4aa0a8c53434c7882e69f8acb46ed1 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.mm
>+++ b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityCommonMac.mm
>@@ -31,8 +31,6 @@
> #import "config.h"
> #import "AccessibilityCommonMac.h"
> 
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> 
> @implementation NSString (JSStringRefAdditions)
>@@ -45,9 +43,9 @@ + (NSString *)stringWithJSStringRef:(JSStringRef)jsStringRef
>     return CFBridgingRelease(JSStringCopyCFString(kCFAllocatorDefault, jsStringRef));
> }
> 
>-- (JSStringRef)createJSStringRef
>+- (JSRetainPtr<JSStringRef>)createJSStringRef
> {
>-    return JSStringCreateWithCFString((__bridge CFStringRef)self);
>+    return adopt(JSStringCreateWithCFString((__bridge CFStringRef)self));
> }
> 
> namespace WTR {
>@@ -66,14 +64,14 @@ NSDictionary *searchPredicateParameterizedAttributeForSearchCriteria(JSContextRe
>     if (searchKey) {
>         id searchKeyParameter = nil;
>         if (JSValueIsString(context, searchKey)) {
>-            JSRetainPtr<JSStringRef> searchKeyString(Adopt, JSValueToStringCopy(context, searchKey, nullptr));
>+            auto searchKeyString = adopt(JSValueToStringCopy(context, searchKey, nullptr));
>             if (searchKeyString)
>                 searchKeyParameter = [NSString stringWithJSStringRef:searchKeyString.get()];
>         } else if (JSValueIsObject(context, searchKey)) {
>             JSObjectRef searchKeyArray = JSValueToObject(context, searchKey, nullptr);
>             unsigned searchKeyArrayLength = 0;
>             
>-            JSRetainPtr<JSStringRef> lengthPropertyString(Adopt, JSStringCreateWithUTF8CString("length"));
>+            auto lengthPropertyString = adopt(JSStringCreateWithUTF8CString("length"));
>             JSValueRef searchKeyArrayLengthValue = JSObjectGetProperty(context, searchKeyArray, lengthPropertyString.get(), nullptr);
>             if (searchKeyArrayLengthValue && JSValueIsNumber(context, searchKeyArrayLengthValue))
>                 searchKeyArrayLength = static_cast<unsigned>(JSValueToNumber(context, searchKeyArrayLengthValue, nullptr));
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityControllerMac.mm b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityControllerMac.mm
>index a38c76818fcbf12cf15cde859cc76f746f87cadf..90e8eeff07eb177a107fc7c009c52f9115ad637f 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityControllerMac.mm
>+++ b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityControllerMac.mm
>@@ -35,8 +35,6 @@
> #import "AccessibilityNotificationHandler.h"
> #import "InjectedBundle.h"
> #import "InjectedBundlePage.h"
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <WebKit/WKBundle.h>
> #import <WebKit/WKBundlePage.h>
>@@ -108,8 +106,7 @@ RefPtr<AccessibilityUIElement> AccessibilityController::accessibleElementById(JS
> 
> JSRetainPtr<JSStringRef> AccessibilityController::platformName()
> {
>-    JSRetainPtr<JSStringRef> platformName(Adopt, JSStringCreateWithUTF8CString("mac"));
>-    return platformName;
>+    return adopt(JSStringCreateWithUTF8CString("mac"));
> }
> 
> } // namespace WTR
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityNotificationHandler.mm b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityNotificationHandler.mm
>index f3ecb3b460de67940b3696bedd4d595c0bf5e2db..5c51d48fe32693759a845e2d4c7e8341c4a206ae 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityNotificationHandler.mm
>+++ b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityNotificationHandler.mm
>@@ -47,14 +47,14 @@ + (void)accessibilitySetShouldRepostNotifications:(BOOL)repost;
> @end
> 
> @interface NSString (JSStringRefAdditions)
>-- (JSStringRef)createJSStringRef;
>+- (JSRetainPtr<JSStringRef>)createJSStringRef;
> @end
> 
> @implementation NSString (JSStringRefAdditions)
> 
>-- (JSStringRef)createJSStringRef
>+- (JSRetainPtr<JSStringRef>)createJSStringRef
> {
>-    return JSStringCreateWithCFString((__bridge CFStringRef)self);
>+    return adopt(JSStringCreateWithCFString((__bridge CFStringRef)self));
> }
> 
> @end
>@@ -126,7 +126,7 @@ - (void)stopObserving
> static JSValueRef makeValueRefForValue(JSContextRef context, id value)
> {
>     if ([value isKindOfClass:[NSString class]])
>-        return JSValueMakeString(context, adopt([value createJSStringRef]).get());
>+        return JSValueMakeString(context, [value createJSStringRef].get());
>     if ([value isKindOfClass:[NSNumber class]]) {
>         if (!strcmp([value objCType], @encode(BOOL)))
>             return JSValueMakeBoolean(context, [value boolValue]);
>@@ -159,7 +159,7 @@ static JSValueRef makeObjectRefForDictionary(JSContextRef context, NSDictionary
>     [dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop)
>     {
>         if (JSValueRef propertyValue = makeValueRefForValue(context, obj))
>-            JSObjectSetProperty(context, object, adopt([key createJSStringRef]).get(), propertyValue, kJSPropertyAttributeNone, nullptr);
>+            JSObjectSetProperty(context, object, [key createJSStringRef].get(), propertyValue, kJSPropertyAttributeNone, nullptr);
>     }];
> 
>     return object;
>@@ -178,7 +178,7 @@ - (void)_notificationReceived:(NSNotification *)notification
>     WKBundleFrameRef mainFrame = WKBundlePageGetMainFrame(WTR::InjectedBundle::singleton().page()->page());
>     JSContextRef context = WKBundleFrameGetJavaScriptContext(mainFrame);
> 
>-    JSValueRef notificationNameArgument = JSValueMakeString(context, adopt([notificationName createJSStringRef]).get());
>+    JSValueRef notificationNameArgument = JSValueMakeString(context, [notificationName createJSStringRef].get());
>     JSValueRef userInfoArgument = makeObjectRefForDictionary(context, userInfo);
>     if (m_platformElement) {
>         // Listener for one element gets the notification name and userInfo.
>diff --git a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityUIElementMac.mm b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityUIElementMac.mm
>index 77dffb306a4813eea698ca09fa1c13b71b3aa4d0..669d6ee37bd42c9926f1de917f1e96cdcd645b2d 100644
>--- a/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityUIElementMac.mm
>+++ b/Tools/WebKitTestRunner/InjectedBundle/mac/AccessibilityUIElementMac.mm
>@@ -35,8 +35,6 @@
> 
> #import <AppKit/NSAccessibility.h>
> #import <Foundation/Foundation.h>
>-#import <JavaScriptCore/JSRetainPtr.h>
>-#import <JavaScriptCore/JSStringRef.h>
> #import <JavaScriptCore/JSStringRefCF.h>
> #import <JavaScriptCore/JSObjectRef.h>
> #import <WebKit/WKBundleFrame.h>
>@@ -87,6 +85,11 @@ @end
> 
> namespace WTR {
> 
>+static JSRetainPtr<JSStringRef> createEmptyJSString()
>+{
>+    return adopt(JSStringCreateWithCharacters(nullptr, 0));
>+}
>+
> AccessibilityUIElement::AccessibilityUIElement(PlatformUIElement element)
>     : m_element(element)
>     , m_notificationHandler(0)
>@@ -199,7 +202,7 @@ static JSValueRef convertElementsToObjectArray(JSContextRef context, Vector<RefP
>     return arrayResult;
> }
> 
>-static JSStringRef concatenateAttributeAndValue(NSString* attribute, NSString* value)
>+static JSRetainPtr<JSStringRef> concatenateAttributeAndValue(NSString* attribute, NSString* value)
> {
>     Vector<UniChar> buffer([attribute length]);
>     [attribute getCharacters:buffer.data()];
>@@ -210,7 +213,7 @@ static JSStringRef concatenateAttributeAndValue(NSString* attribute, NSString* v
>     [value getCharacters:valueBuffer.data()];
>     buffer.appendVector(valueBuffer);
> 
>-    return JSStringCreateWithCharacters(buffer.data(), buffer.size());
>+    return adopt(JSStringCreateWithCharacters(buffer.data(), buffer.size()));
> }
> 
> static void convertNSArrayToVector(NSArray* array, Vector<RefPtr<AccessibilityUIElement> >& elementVector)
>@@ -220,7 +223,7 @@ static void convertNSArrayToVector(NSArray* array, Vector<RefPtr<AccessibilityUI
>         elementVector.append(AccessibilityUIElement::create([array objectAtIndex:i]));
> }
> 
>-static JSStringRef descriptionOfElements(Vector<RefPtr<AccessibilityUIElement> >& elementVector)
>+static JSRetainPtr<JSStringRef> descriptionOfElements(Vector<RefPtr<AccessibilityUIElement> >& elementVector)
> {
>     NSMutableString* allElementString = [NSMutableString string];
>     size_t size = elementVector.size();
>@@ -243,7 +246,7 @@ static NSDictionary *selectTextParameterizedAttributeForCriteria(JSContextRef co
>     if (searchStrings) {
>         NSMutableArray *searchStringsParameter = [NSMutableArray array];
>         if (JSValueIsString(context, searchStrings)) {
>-            JSRetainPtr<JSStringRef> searchStringsString(Adopt, JSValueToStringCopy(context, searchStrings, nullptr));
>+            auto searchStringsString = adopt(JSValueToStringCopy(context, searchStrings, nullptr));
>             if (searchStringsString)
>                 [searchStringsParameter addObject:[NSString stringWithJSStringRef:searchStringsString.get()]];
>         }
>@@ -251,13 +254,13 @@ static NSDictionary *selectTextParameterizedAttributeForCriteria(JSContextRef co
>             JSObjectRef searchStringsArray = JSValueToObject(context, searchStrings, nullptr);
>             unsigned searchStringsArrayLength = 0;
>             
>-            JSRetainPtr<JSStringRef> lengthPropertyString(Adopt, JSStringCreateWithUTF8CString("length"));
>+            auto lengthPropertyString = adopt(JSStringCreateWithUTF8CString("length"));
>             JSValueRef searchStringsArrayLengthValue = JSObjectGetProperty(context, searchStringsArray, lengthPropertyString.get(), nullptr);
>             if (searchStringsArrayLengthValue && JSValueIsNumber(context, searchStringsArrayLengthValue))
>                 searchStringsArrayLength = static_cast<unsigned>(JSValueToNumber(context, searchStringsArrayLengthValue, nullptr));
>             
>             for (unsigned i = 0; i < searchStringsArrayLength; ++i) {
>-                JSRetainPtr<JSStringRef> searchStringsString(Adopt, JSValueToStringCopy(context, JSObjectGetPropertyAtIndex(context, searchStringsArray, i, nullptr), nullptr));
>+                auto searchStringsString = adopt(JSValueToStringCopy(context, JSObjectGetPropertyAtIndex(context, searchStringsArray, i, nullptr), nullptr));
>                 if (searchStringsString)
>                     [searchStringsParameter addObject:[NSString stringWithJSStringRef:searchStringsString.get()]];
>             }
>@@ -1500,7 +1503,7 @@ void AccessibilityUIElement::clearSelectedChildren() const
> JSRetainPtr<JSStringRef> AccessibilityUIElement::accessibilityValue() const
> {
>     // FIXME: implement
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::documentEncoding()
>@@ -1511,7 +1514,7 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::documentEncoding()
>         return [value createJSStringRef];
>     END_AX_OBJC_EXCEPTIONS
>     
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::documentURI()
>@@ -1522,7 +1525,7 @@ JSRetainPtr<JSStringRef> AccessibilityUIElement::documentURI()
>         return [value createJSStringRef];
>     END_AX_OBJC_EXCEPTIONS
>     
>-    return JSStringCreateWithCharacters(0, 0);
>+    return createEmptyJSString();
> }
> 
> JSRetainPtr<JSStringRef> AccessibilityUIElement::url()
>@@ -1825,7 +1828,7 @@ RefPtr<AccessibilityUIElement> AccessibilityUIElement::accessibilityElementForTe
>     return nullptr;
> }
> 
>-static JSStringRef createJSStringRef(id string)
>+static JSRetainPtr<JSStringRef> createJSStringRef(id string)
> {
>     id mutableString = [[[NSMutableString alloc] init] autorelease];
>     id attributes = [string attributesAtIndex:0 effectiveRange:nil];
>diff --git a/Tools/WebKitTestRunner/StringFunctions.h b/Tools/WebKitTestRunner/StringFunctions.h
>index 752731cbf9ffe8b6e6b56fb32c815a0bf1598d1c..daf14ca705486bfc20643123de5091b79e5d0131 100644
>--- a/Tools/WebKitTestRunner/StringFunctions.h
>+++ b/Tools/WebKitTestRunner/StringFunctions.h
>@@ -50,7 +50,7 @@ inline WKRetainPtr<WKStringRef> toWK(JSStringRef string)
>     return adoptWK(WKStringCreateWithJSString(string));
> }
> 
>-inline WKRetainPtr<WKStringRef> toWK(JSRetainPtr<JSStringRef> string)
>+inline WKRetainPtr<WKStringRef> toWK(const JSRetainPtr<JSStringRef>& string)
> {
>     return toWK(string.get());
> }
>@@ -62,7 +62,7 @@ inline WKRetainPtr<WKStringRef> toWK(const WTF::String& string)
> 
> inline JSRetainPtr<JSStringRef> toJS(WKStringRef string)
> {
>-    return JSRetainPtr<JSStringRef>(Adopt, WKStringCopyJSString(string));
>+    return adopt(WKStringCopyJSString(string));
> }
> 
> inline JSRetainPtr<JSStringRef> toJS(const WKRetainPtr<WKStringRef>& string)

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Attachments on bug 189455: 349270 | 349271 | 349273 | 349278 | 349279 | 349849 | 349853 | 349854