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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/197512">197512</a></dd>
<dt>Author</dt> <dd>sbarati@apple.com</dd>
<dt>Date</dt> <dd>2016-03-03 11:18:35 -0800 (Thu, 03 Mar 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>[[SetPrototypeOf]] isn't properly implemented everywhere
https://bugs.webkit.org/show_bug.cgi?id=154943
Reviewed by Benjamin Poulain.
We were copy-pasting implememntation bits that belong in OrdinarySetPrototypeOf
in a few different places that call O.[[SetPrototypeOf]](v)
rather than having those bits in OrdinarySetPrototypeOf itself.
We need to put those copy-pasted bits into OrdinarySetPrototypeOf
and not the call sites of O.[[SetPrototypeOf]](v) because
O.[[SetPrototypeOf]](v) won't always call into OrdinarySetPrototypeOf.
This is needed for correctness because this behavior is now observable
with the ES6 Proxy object.
* runtime/ClassInfo.h:
* runtime/JSCell.cpp:
(JSC::JSCell::isExtensible):
(JSC::JSCell::setPrototype):
* runtime/JSCell.h:
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncProtoSetter):
* runtime/JSObject.cpp:
(JSC::JSObject::setPrototypeDirect):
(JSC::JSObject::setPrototypeWithCycleCheck):
(JSC::JSObject::setPrototype):
(JSC::JSObject::allowsAccessFrom):
* runtime/JSObject.h:
(JSC::JSObject::mayInterceptIndexedAccesses):
* runtime/ObjectConstructor.cpp:
(JSC::objectConstructorSetPrototypeOf):
* runtime/ReflectObject.cpp:
(JSC::reflectObjectSetPrototypeOf):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeClassInfoh">trunk/Source/JavaScriptCore/runtime/ClassInfo.h</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSCellcpp">trunk/Source/JavaScriptCore/runtime/JSCell.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSCellh">trunk/Source/JavaScriptCore/runtime/JSCell.h</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSGlobalObjectFunctionscpp">trunk/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSObjectcpp">trunk/Source/JavaScriptCore/runtime/JSObject.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSObjecth">trunk/Source/JavaScriptCore/runtime/JSObject.h</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeObjectConstructorcpp">trunk/Source/JavaScriptCore/runtime/ObjectConstructor.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeReflectObjectcpp">trunk/Source/JavaScriptCore/runtime/ReflectObject.cpp</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/ChangeLog 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -1,3 +1,38 @@
</span><ins>+2016-03-03 Saam barati <sbarati@apple.com>
+
+ [[SetPrototypeOf]] isn't properly implemented everywhere
+ https://bugs.webkit.org/show_bug.cgi?id=154943
+
+ Reviewed by Benjamin Poulain.
+
+ We were copy-pasting implememntation bits that belong in OrdinarySetPrototypeOf
+ in a few different places that call O.[[SetPrototypeOf]](v)
+ rather than having those bits in OrdinarySetPrototypeOf itself.
+ We need to put those copy-pasted bits into OrdinarySetPrototypeOf
+ and not the call sites of O.[[SetPrototypeOf]](v) because
+ O.[[SetPrototypeOf]](v) won't always call into OrdinarySetPrototypeOf.
+ This is needed for correctness because this behavior is now observable
+ with the ES6 Proxy object.
+
+ * runtime/ClassInfo.h:
+ * runtime/JSCell.cpp:
+ (JSC::JSCell::isExtensible):
+ (JSC::JSCell::setPrototype):
+ * runtime/JSCell.h:
+ * runtime/JSGlobalObjectFunctions.cpp:
+ (JSC::globalFuncProtoSetter):
+ * runtime/JSObject.cpp:
+ (JSC::JSObject::setPrototypeDirect):
+ (JSC::JSObject::setPrototypeWithCycleCheck):
+ (JSC::JSObject::setPrototype):
+ (JSC::JSObject::allowsAccessFrom):
+ * runtime/JSObject.h:
+ (JSC::JSObject::mayInterceptIndexedAccesses):
+ * runtime/ObjectConstructor.cpp:
+ (JSC::objectConstructorSetPrototypeOf):
+ * runtime/ReflectObject.cpp:
+ (JSC::reflectObjectSetPrototypeOf):
+
</ins><span class="cx"> 2016-03-03 Alex Christensen <achristensen@webkit.org>
</span><span class="cx">
</span><span class="cx"> Fix Windows build after r197489.
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeClassInfoh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/ClassInfo.h (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/ClassInfo.h 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/ClassInfo.h 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -109,7 +109,7 @@
</span><span class="cx"> typedef bool (*IsExtensibleFunctionPtr)(JSObject*, ExecState*);
</span><span class="cx"> IsExtensibleFunctionPtr isExtensible;
</span><span class="cx">
</span><del>- typedef bool (*SetPrototypeFunctionPtr)(JSObject*, ExecState*, JSValue);
</del><ins>+ typedef bool (*SetPrototypeFunctionPtr)(JSObject*, ExecState*, JSValue, bool shouldThrowIfCantSet);
</ins><span class="cx"> SetPrototypeFunctionPtr setPrototype;
</span><span class="cx">
</span><span class="cx"> typedef void (*DumpToStreamFunctionPtr)(const JSCell*, PrintStream&);
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSCellcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSCell.cpp (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSCell.cpp 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/JSCell.cpp 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -280,7 +280,7 @@
</span><span class="cx"> RELEASE_ASSERT_NOT_REACHED();
</span><span class="cx"> }
</span><span class="cx">
</span><del>-bool JSCell::setPrototype(JSObject*, ExecState*, JSValue)
</del><ins>+bool JSCell::setPrototype(JSObject*, ExecState*, JSValue, bool)
</ins><span class="cx"> {
</span><span class="cx"> RELEASE_ASSERT_NOT_REACHED();
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSCellh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSCell.h (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSCell.h 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/JSCell.h 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -208,7 +208,7 @@
</span><span class="cx"> static NO_RETURN_DUE_TO_CRASH void getGenericPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
</span><span class="cx"> static NO_RETURN_DUE_TO_CRASH bool preventExtensions(JSObject*, ExecState*);
</span><span class="cx"> static NO_RETURN_DUE_TO_CRASH bool isExtensible(JSObject*, ExecState*);
</span><del>- static NO_RETURN_DUE_TO_CRASH bool setPrototype(JSObject*, ExecState*, JSValue);
</del><ins>+ static NO_RETURN_DUE_TO_CRASH bool setPrototype(JSObject*, ExecState*, JSValue, bool);
</ins><span class="cx">
</span><span class="cx"> static String className(const JSObject*);
</span><span class="cx"> JS_EXPORT_PRIVATE static bool customHasInstance(JSObject*, ExecState*, JSValue);
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSGlobalObjectFunctionscpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -882,22 +882,9 @@
</span><span class="cx"> if (!value.isObject() && !value.isNull())
</span><span class="cx"> return JSValue::encode(jsUndefined());
</span><span class="cx">
</span><del>- if (thisObject->prototype() == value)
- return JSValue::encode(jsUndefined());
-
- bool isExtensible = thisObject->isExtensible(exec);
- if (exec->hadException())
- return JSValue::encode(jsUndefined());
- if (!isExtensible)
- return throwVMError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
-
</del><span class="cx"> VM& vm = exec->vm();
</span><del>- if (!thisObject->setPrototype(vm, exec, value)) {
- if (!vm.exception())
- vm.throwException(exec, createError(exec, ASCIILiteral("cyclic __proto__ value")));
- return JSValue::encode(jsUndefined());
- }
- ASSERT(!exec->hadException());
</del><ins>+ bool shouldThrowIfCantSet = true;
+ thisObject->setPrototype(vm, exec, value, shouldThrowIfCantSet);
</ins><span class="cx"> return JSValue::encode(jsUndefined());
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSObjectcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSObject.cpp (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSObject.cpp 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/JSObject.cpp 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -1197,28 +1197,44 @@
</span><span class="cx"> switchToSlowPutArrayStorage(vm);
</span><span class="cx"> }
</span><span class="cx">
</span><del>-bool JSObject::setPrototypeWithCycleCheck(VM& vm, ExecState* exec, JSValue prototype)
</del><ins>+bool JSObject::setPrototypeWithCycleCheck(VM& vm, ExecState* exec, JSValue prototype, bool shouldThrowIfCantSet)
</ins><span class="cx"> {
</span><del>- UNUSED_PARAM(exec);
</del><span class="cx"> ASSERT(methodTable(vm)->toThis(this, exec, NotStrictMode) == this);
</span><ins>+
+ if (this->prototype() == prototype)
+ return true;
+
+ bool isExtensible = this->isExtensible(exec);
+ if (vm.exception())
+ return false;
+
+ if (!isExtensible) {
+ if (shouldThrowIfCantSet)
+ throwVMError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
+ return false;
+ }
+
</ins><span class="cx"> JSValue nextPrototype = prototype;
</span><span class="cx"> while (nextPrototype && nextPrototype.isObject()) {
</span><del>- if (nextPrototype == this)
</del><ins>+ if (nextPrototype == this) {
+ if (shouldThrowIfCantSet)
+ vm.throwException(exec, createError(exec, ASCIILiteral("cyclic __proto__ value")));
</ins><span class="cx"> return false;
</span><ins>+ }
</ins><span class="cx"> nextPrototype = asObject(nextPrototype)->prototype();
</span><span class="cx"> }
</span><span class="cx"> setPrototypeDirect(vm, prototype);
</span><span class="cx"> return true;
</span><span class="cx"> }
</span><span class="cx">
</span><del>-bool JSObject::setPrototype(JSObject* object, ExecState* exec, JSValue prototype)
</del><ins>+bool JSObject::setPrototype(JSObject* object, ExecState* exec, JSValue prototype, bool shouldThrowIfCantSet)
</ins><span class="cx"> {
</span><del>- return object->setPrototypeWithCycleCheck(exec->vm(), exec, prototype);
</del><ins>+ return object->setPrototypeWithCycleCheck(exec->vm(), exec, prototype, shouldThrowIfCantSet);
</ins><span class="cx"> }
</span><span class="cx">
</span><del>-bool JSObject::setPrototype(VM& vm, ExecState* exec, JSValue prototype)
</del><ins>+bool JSObject::setPrototype(VM& vm, ExecState* exec, JSValue prototype, bool shouldThrowIfCantSet)
</ins><span class="cx"> {
</span><del>- return methodTable(vm)->setPrototype(this, exec, prototype);
</del><ins>+ return methodTable(vm)->setPrototype(this, exec, prototype, shouldThrowIfCantSet);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> bool JSObject::allowsAccessFrom(ExecState* exec)
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSObjecth"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSObject.h (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSObject.h 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/JSObject.h 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -114,13 +114,13 @@
</span><span class="cx"> private:
</span><span class="cx"> // This is OrdinarySetPrototypeOf in the specification. Section 9.1.2.1
</span><span class="cx"> // https://tc39.github.io/ecma262/#sec-ordinarysetprototypeof
</span><del>- JS_EXPORT_PRIVATE bool setPrototypeWithCycleCheck(VM&, ExecState*, JSValue prototype);
</del><ins>+ JS_EXPORT_PRIVATE bool setPrototypeWithCycleCheck(VM&, ExecState*, JSValue prototype, bool shouldThrowIfCantSet);
</ins><span class="cx"> public:
</span><span class="cx"> // This is the fully virtual [[SetPrototypeOf]] internal function defined
</span><span class="cx"> // in the ECMAScript 6 specification. Use this when doing a [[SetPrototypeOf]]
</span><span class="cx"> // operation as dictated in the specification.
</span><del>- bool setPrototype(VM&, ExecState*, JSValue prototype);
- JS_EXPORT_PRIVATE static bool setPrototype(JSObject*, ExecState*, JSValue prototype);
</del><ins>+ bool setPrototype(VM&, ExecState*, JSValue prototype, bool shouldThrowIfCantSet = false);
+ JS_EXPORT_PRIVATE static bool setPrototype(JSObject*, ExecState*, JSValue prototype, bool shouldThrowIfCantSet);
</ins><span class="cx">
</span><span class="cx"> bool mayInterceptIndexedAccesses()
</span><span class="cx"> {
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeObjectConstructorcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/ObjectConstructor.cpp (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/ObjectConstructor.cpp 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/ObjectConstructor.cpp 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -209,24 +209,10 @@
</span><span class="cx"> if (!checkProtoSetterAccessAllowed(exec, object))
</span><span class="cx"> return JSValue::encode(objectValue);
</span><span class="cx">
</span><del>- if (object->prototype() == protoValue)
- return JSValue::encode(objectValue);
-
- bool isExtensible = object->isExtensible(exec);
- if (exec->hadException())
- return JSValue::encode(JSValue());
- if (!isExtensible)
- return throwVMError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
-
</del><span class="cx"> VM& vm = exec->vm();
</span><del>- bool didSetPrototype = object->setPrototype(vm, exec, protoValue);
- if (vm.exception())
- return JSValue::encode(JSValue());
- if (!didSetPrototype) {
- vm.throwException(exec, createError(exec, ASCIILiteral("cyclic __proto__ value")));
- return JSValue::encode(jsUndefined());
- }
-
</del><ins>+ bool shouldThrowIfCantSet = true;
+ bool didSetPrototype = object->setPrototype(vm, exec, protoValue, shouldThrowIfCantSet);
+ ASSERT_UNUSED(didSetPrototype, vm.exception() || didSetPrototype);
</ins><span class="cx"> return JSValue::encode(objectValue);
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeReflectObjectcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/ReflectObject.cpp (197511 => 197512)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/ReflectObject.cpp 2016-03-03 18:34:11 UTC (rev 197511)
+++ trunk/Source/JavaScriptCore/runtime/ReflectObject.cpp 2016-03-03 19:18:35 UTC (rev 197512)
</span><span class="lines">@@ -212,17 +212,9 @@
</span><span class="cx"> if (!checkProtoSetterAccessAllowed(exec, object))
</span><span class="cx"> return JSValue::encode(jsBoolean(false));
</span><span class="cx">
</span><del>- if (object->prototype() == proto)
- return JSValue::encode(jsBoolean(true));
-
- bool isExtensible = object->isExtensible(exec);
- if (exec->hadException())
- return JSValue::encode(JSValue());
- if (!isExtensible)
- return JSValue::encode(jsBoolean(false));
-
</del><span class="cx"> VM& vm = exec->vm();
</span><del>- bool didSetPrototype = object->setPrototype(vm, exec, proto);
</del><ins>+ bool shouldThrowIfCantSet = false;
+ bool didSetPrototype = object->setPrototype(vm, exec, proto, shouldThrowIfCantSet);
</ins><span class="cx"> if (vm.exception())
</span><span class="cx"> return JSValue::encode(JSValue());
</span><span class="cx"> return JSValue::encode(jsBoolean(didSetPrototype));
</span></span></pre>
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