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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/196179">196179</a></dd>
<dt>Author</dt> <dd>fpizlo@apple.com</dd>
<dt>Date</dt> <dd>2016-02-05 11:52:19 -0800 (Fri, 05 Feb 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Arrayify for a typed array shouldn't create a monster
https://bugs.webkit.org/show_bug.cgi?id=153908
rdar://problem/24290639
Reviewed by Mark Lam.
Previously if you convinced the DFG to emit an Arrayify to ArrayStorage and then gave it a
typed array, you'd corrupt the object.
* runtime/JSArrayBufferView.cpp:
(WTF::printInternal):
* runtime/JSArrayBufferView.h:
* runtime/JSGenericTypedArrayViewInlines.h:
(JSC::JSGenericTypedArrayView<Adaptor>::visitChildren):
(JSC::JSGenericTypedArrayView<Adaptor>::slowDownAndWasteMemory):
* runtime/JSObject.cpp:
(JSC::JSObject::copyButterfly):
(JSC::JSObject::enterDictionaryIndexingMode):
(JSC::JSObject::ensureInt32Slow):
(JSC::JSObject::ensureDoubleSlow):
(JSC::JSObject::ensureContiguousSlow):
(JSC::JSObject::ensureArrayStorageSlow):
(JSC::JSObject::growOutOfLineStorage):
(JSC::getBoundSlotBaseFunctionForGetterSetter):
* runtime/Structure.h:
* tests/stress/arrayify-array-storage-typed-array.js: Added. This test failed.
* tests/stress/arrayify-int32-typed-array.js: Added. This test case already had other protections, but we beefed them up.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSArrayBufferViewcpp">trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSArrayBufferViewh">trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.h</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSGenericTypedArrayViewInlinesh">trunk/Source/JavaScriptCore/runtime/JSGenericTypedArrayViewInlines.h</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSObjectcpp">trunk/Source/JavaScriptCore/runtime/JSObject.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeStructureh">trunk/Source/JavaScriptCore/runtime/Structure.h</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoretestsstressarrayifyarraystoragetypedarrayjs">trunk/Source/JavaScriptCore/tests/stress/arrayify-array-storage-typed-array.js</a></li>
<li><a href="#trunkSourceJavaScriptCoretestsstressarrayifyint32typedarrayjs">trunk/Source/JavaScriptCore/tests/stress/arrayify-int32-typed-array.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (196178 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2016-02-05 19:51:54 UTC (rev 196178)
+++ trunk/Source/JavaScriptCore/ChangeLog 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -1,3 +1,33 @@
</span><ins>+2016-02-05 Filip Pizlo <fpizlo@apple.com>
+
+ Arrayify for a typed array shouldn't create a monster
+ https://bugs.webkit.org/show_bug.cgi?id=153908
+ rdar://problem/24290639
+
+ Reviewed by Mark Lam.
+
+ Previously if you convinced the DFG to emit an Arrayify to ArrayStorage and then gave it a
+ typed array, you'd corrupt the object.
+
+ * runtime/JSArrayBufferView.cpp:
+ (WTF::printInternal):
+ * runtime/JSArrayBufferView.h:
+ * runtime/JSGenericTypedArrayViewInlines.h:
+ (JSC::JSGenericTypedArrayView<Adaptor>::visitChildren):
+ (JSC::JSGenericTypedArrayView<Adaptor>::slowDownAndWasteMemory):
+ * runtime/JSObject.cpp:
+ (JSC::JSObject::copyButterfly):
+ (JSC::JSObject::enterDictionaryIndexingMode):
+ (JSC::JSObject::ensureInt32Slow):
+ (JSC::JSObject::ensureDoubleSlow):
+ (JSC::JSObject::ensureContiguousSlow):
+ (JSC::JSObject::ensureArrayStorageSlow):
+ (JSC::JSObject::growOutOfLineStorage):
+ (JSC::getBoundSlotBaseFunctionForGetterSetter):
+ * runtime/Structure.h:
+ * tests/stress/arrayify-array-storage-typed-array.js: Added. This test failed.
+ * tests/stress/arrayify-int32-typed-array.js: Added. This test case already had other protections, but we beefed them up.
+
</ins><span class="cx"> 2016-02-04 Joseph Pecoraro <pecoraro@apple.com>
</span><span class="cx">
</span><span class="cx"> Web Inspector: InspectorTimelineAgent doesn't need to recompile functions because it now uses the sampling profiler
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSArrayBufferViewcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.cpp (196178 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.cpp 2016-02-05 19:51:54 UTC (rev 196178)
+++ trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.cpp 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /*
</span><del>- * Copyright (C) 2013 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions
</span><span class="lines">@@ -207,3 +207,28 @@
</span><span class="cx">
</span><span class="cx"> } // namespace JSC
</span><span class="cx">
</span><ins>+namespace WTF {
+
+using namespace JSC;
+
+void printInternal(PrintStream& out, TypedArrayMode mode)
+{
+ switch (mode) {
+ case FastTypedArray:
+ out.print("FastTypedArray");
+ return;
+ case OversizeTypedArray:
+ out.print("OversizeTypedArray");
+ return;
+ case WastefulTypedArray:
+ out.print("WastefulTypedArray");
+ return;
+ case DataViewMode:
+ out.print("DataViewMode");
+ return;
+ }
+ RELEASE_ASSERT_NOT_REACHED();
+}
+
+} // namespace WTF
+
</ins></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSArrayBufferViewh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.h (196178 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.h 2016-02-05 19:51:54 UTC (rev 196178)
+++ trunk/Source/JavaScriptCore/runtime/JSArrayBufferView.h 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /*
</span><del>- * Copyright (C) 2013 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions
</span><span class="lines">@@ -193,5 +193,11 @@
</span><span class="cx">
</span><span class="cx"> } // namespace JSC
</span><span class="cx">
</span><ins>+namespace WTF {
+
+void printInternal(PrintStream&, JSC::TypedArrayMode);
+
+} // namespace WTF
+
</ins><span class="cx"> #endif // JSArrayBufferView_h
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSGenericTypedArrayViewInlinesh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSGenericTypedArrayViewInlines.h (196178 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSGenericTypedArrayViewInlines.h 2016-02-05 19:51:54 UTC (rev 196178)
+++ trunk/Source/JavaScriptCore/runtime/JSGenericTypedArrayViewInlines.h 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /*
</span><del>- * Copyright (C) 2013 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions
</span><span class="lines">@@ -424,6 +424,7 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> case WastefulTypedArray:
</span><ins>+ RELEASE_ASSERT(thisObject->existingBufferInButterfly());
</ins><span class="cx"> break;
</span><span class="cx">
</span><span class="cx"> case DataViewMode:
</span><span class="lines">@@ -484,6 +485,7 @@
</span><span class="cx"> thisObject->m_butterfly.setWithoutBarrier(
</span><span class="cx"> bitwise_cast<IndexingHeader*>(thisObject->vector())->butterfly());
</span><span class="cx"> } else {
</span><ins>+ RELEASE_ASSERT(!thisObject->hasIndexingHeader());
</ins><span class="cx"> VM& vm = *heap->vm();
</span><span class="cx"> thisObject->m_butterfly.set(vm, thisObject, Butterfly::createOrGrowArrayRight(
</span><span class="cx"> thisObject->butterfly(), vm, thisObject, thisObject->structure(),
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSObjectcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSObject.cpp (196178 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSObject.cpp 2016-02-05 19:51:54 UTC (rev 196178)
+++ trunk/Source/JavaScriptCore/runtime/JSObject.cpp 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -1,7 +1,7 @@
</span><span class="cx"> /*
</span><span class="cx"> * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
</span><span class="cx"> * Copyright (C) 2001 Peter Kelly (pmk@post.com)
</span><del>- * Copyright (C) 2003-2006, 2008, 2009, 2012-2015 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2003-2006, 2008, 2009, 2012-2016 Apple Inc. All rights reserved.
</ins><span class="cx"> * Copyright (C) 2007 Eric Seidel (eric@webkit.org)
</span><span class="cx"> *
</span><span class="cx"> * This library is free software; you can redistribute it and/or
</span><span class="lines">@@ -105,7 +105,7 @@
</span><span class="cx"> size_t capacityInBytes = Butterfly::totalSize(preCapacity, propertyCapacity, hasIndexingHeader, indexingPayloadSizeInBytes);
</span><span class="cx"> if (visitor.checkIfShouldCopy(butterfly->base(preCapacity, propertyCapacity))) {
</span><span class="cx"> Butterfly* newButterfly = Butterfly::createUninitializedDuringCollection(visitor, preCapacity, propertyCapacity, hasIndexingHeader, indexingPayloadSizeInBytes);
</span><del>-
</del><ins>+
</ins><span class="cx"> // Copy the properties.
</span><span class="cx"> PropertyStorage currentTarget = newButterfly->propertyStorage();
</span><span class="cx"> PropertyStorage currentSource = butterfly->propertyStorage();
</span><span class="lines">@@ -590,8 +590,11 @@
</span><span class="cx"> case ALL_DOUBLE_INDEXING_TYPES:
</span><span class="cx"> case ALL_CONTIGUOUS_INDEXING_TYPES:
</span><span class="cx"> // NOTE: this is horribly inefficient, as it will perform two conversions. We could optimize
</span><del>- // this case if we ever cared.
- enterDictionaryIndexingModeWhenArrayStorageAlreadyExists(vm, ensureArrayStorageSlow(vm));
</del><ins>+ // this case if we ever cared. Note that ensureArrayStorage() can return null if the object
+ // doesn't support traditional indexed properties. At the time of writing, this just affects
+ // typed arrays.
+ if (ArrayStorage* storage = ensureArrayStorageSlow(vm))
+ enterDictionaryIndexingModeWhenArrayStorageAlreadyExists(vm, storage);
</ins><span class="cx"> break;
</span><span class="cx"> case ALL_ARRAY_STORAGE_INDEXING_TYPES:
</span><span class="cx"> enterDictionaryIndexingModeWhenArrayStorageAlreadyExists(vm, m_butterfly.get(this)->arrayStorage());
</span><span class="lines">@@ -968,6 +971,9 @@
</span><span class="cx"> {
</span><span class="cx"> ASSERT(inherits(info()));
</span><span class="cx">
</span><ins>+ if (structure(vm)->hijacksIndexingHeader())
+ return ContiguousJSValues();
+
</ins><span class="cx"> switch (indexingType()) {
</span><span class="cx"> case ALL_BLANK_INDEXING_TYPES:
</span><span class="cx"> if (UNLIKELY(indexingShouldBeSparse() || structure(vm)->needsSlowPutIndexing()))
</span><span class="lines">@@ -992,6 +998,9 @@
</span><span class="cx"> {
</span><span class="cx"> ASSERT(inherits(info()));
</span><span class="cx">
</span><ins>+ if (structure(vm)->hijacksIndexingHeader())
+ return ContiguousDoubles();
+
</ins><span class="cx"> switch (indexingType()) {
</span><span class="cx"> case ALL_BLANK_INDEXING_TYPES:
</span><span class="cx"> if (UNLIKELY(indexingShouldBeSparse() || structure(vm)->needsSlowPutIndexing()))
</span><span class="lines">@@ -1018,6 +1027,9 @@
</span><span class="cx"> {
</span><span class="cx"> ASSERT(inherits(info()));
</span><span class="cx">
</span><ins>+ if (structure(vm)->hijacksIndexingHeader())
+ return ContiguousJSValues();
+
</ins><span class="cx"> switch (indexingType()) {
</span><span class="cx"> case ALL_BLANK_INDEXING_TYPES:
</span><span class="cx"> if (UNLIKELY(indexingShouldBeSparse() || structure(vm)->needsSlowPutIndexing()))
</span><span class="lines">@@ -1045,6 +1057,9 @@
</span><span class="cx"> ArrayStorage* JSObject::ensureArrayStorageSlow(VM& vm)
</span><span class="cx"> {
</span><span class="cx"> ASSERT(inherits(info()));
</span><ins>+
+ if (structure(vm)->hijacksIndexingHeader())
+ return nullptr;
</ins><span class="cx">
</span><span class="cx"> switch (indexingType()) {
</span><span class="cx"> case ALL_BLANK_INDEXING_TYPES:
</span><span class="lines">@@ -2547,7 +2562,7 @@
</span><span class="cx">
</span><span class="cx"> // It's important that this function not rely on structure(), for the property
</span><span class="cx"> // capacity, since we might have already mutated the structure in-place.
</span><del>-
</del><ins>+
</ins><span class="cx"> return Butterfly::createOrGrowPropertyStorage(m_butterfly.get(this), vm, this, structure(vm), oldSize, newSize);
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeStructureh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/Structure.h (196178 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/Structure.h 2016-02-05 19:51:54 UTC (rev 196178)
+++ trunk/Source/JavaScriptCore/runtime/Structure.h 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /*
</span><del>- * Copyright (C) 2008, 2009, 2012-2015 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2008, 2009, 2012-2016 Apple Inc. All rights reserved.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions
</span><span class="lines">@@ -320,11 +320,16 @@
</span><span class="cx"> && offset <= m_offset
</span><span class="cx"> && (offset < m_inlineCapacity || offset >= firstOutOfLineOffset);
</span><span class="cx"> }
</span><ins>+
+ bool hijacksIndexingHeader() const
+ {
+ return isTypedView(m_classInfo->typedArrayStorageType);
+ }
</ins><span class="cx">
</span><span class="cx"> bool couldHaveIndexingHeader() const
</span><span class="cx"> {
</span><span class="cx"> return hasIndexedProperties(indexingType())
</span><del>- || isTypedView(m_classInfo->typedArrayStorageType);
</del><ins>+ || hijacksIndexingHeader();
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> bool hasIndexingHeader(const JSCell*) const;
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoretestsstressarrayifyarraystoragetypedarrayjs"></a>
<div class="addfile"><h4>Added: trunk/Source/JavaScriptCore/tests/stress/arrayify-array-storage-typed-array.js (0 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/tests/stress/arrayify-array-storage-typed-array.js (rev 0)
+++ trunk/Source/JavaScriptCore/tests/stress/arrayify-array-storage-typed-array.js 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -0,0 +1,36 @@
</span><ins>+function make1() {
+ var a = [];
+ a.__defineGetter__(42, function() { return 42; });
+ return a;
+}
+
+noInline(make1);
+
+function make2() {
+ return [42];
+}
+
+noInline(make2);
+
+for (var i = 0; i < 10000; ++i) {
+ make1();
+ make2();
+}
+
+function foo(o) {
+ o[0] = 0;
+}
+
+noInline(foo);
+
+for (var i = 0; i < 10000; ++i) {
+ foo(make1());
+ foo(make2());
+}
+
+var o = new Int8Array(100);
+var b = o.buffer;
+foo(o);
+if (o.buffer != b)
+ throw "Error: buffer changed.";
+
</ins></span></pre></div>
<a id="trunkSourceJavaScriptCoretestsstressarrayifyint32typedarrayjs"></a>
<div class="addfile"><h4>Added: trunk/Source/JavaScriptCore/tests/stress/arrayify-int32-typed-array.js (0 => 196179)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/tests/stress/arrayify-int32-typed-array.js (rev 0)
+++ trunk/Source/JavaScriptCore/tests/stress/arrayify-int32-typed-array.js 2016-02-05 19:52:19 UTC (rev 196179)
</span><span class="lines">@@ -0,0 +1,34 @@
</span><ins>+function make1() {
+ return [];
+}
+
+noInline(make1);
+
+function make2() {
+ return [42];
+}
+
+noInline(make2);
+
+for (var i = 0; i < 10000; ++i) {
+ make1();
+ make2();
+}
+
+function foo(o) {
+ o[0] = 0;
+}
+
+noInline(foo);
+
+for (var i = 0; i < 10000; ++i) {
+ foo(make1());
+ foo(make2());
+}
+
+var o = new Int8Array(100);
+var b = o.buffer;
+foo(o);
+if (o.buffer != b)
+ throw "Error: buffer changed.";
+
</ins></span></pre>
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