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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/286278">286278</a></dd>
<dt>Author</dt> <dd>sbarati@apple.com</dd>
<dt>Date</dt> <dd>2021-11-29 17:58:37 -0800 (Mon, 29 Nov 2021)</dd>
</dl>

<h3>Log Message</h3>
<pre>FTL's implementation of HasIndexedProperty for InBounds accesses checks the inverse of what it should be checking when exiting by seeing a hole
https://bugs.webkit.org/show_bug.cgi?id=233408
<rdar://problem/85787251>

Reviewed by Mark Lam.

JSTests:

* stress/in-by-val-has-indexed-property-ftl-3.js: Added.
* stress/in-by-val-has-indexed-property-ftl-2.js: Added.
* stress/in-by-val-has-indexed-property-ftl.js: Added.

Source/JavaScriptCore:

The implementation of an InBounds HasIndexedProperty in FTL, when speculating, we
would exit when we did not see a hole, not when we did see a hole. This is
the inverse of what we need to do, we should exit when we do see a hole.

* ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
* tools/JSDollarVM.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
(JSC::JSDollarVM::finishCreation):</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkJSTestsChangeLog">trunk/JSTests/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreftlFTLLowerDFGToB3cpp">trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoretoolsJSDollarVMcpp">trunk/Source/JavaScriptCore/tools/JSDollarVM.cpp</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkJSTestsstressinbyvalhasindexedpropertyftl2js">trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-2.js</a></li>
<li><a href="#trunkJSTestsstressinbyvalhasindexedpropertyftl3js">trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-3.js</a></li>
<li><a href="#trunkJSTestsstressinbyvalhasindexedpropertyftljs">trunk/JSTests/stress/in-by-val-has-indexed-property-ftl.js</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkJSTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/JSTests/ChangeLog (286277 => 286278)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/JSTests/ChangeLog  2021-11-30 01:42:49 UTC (rev 286277)
+++ trunk/JSTests/ChangeLog     2021-11-30 01:58:37 UTC (rev 286278)
</span><span class="lines">@@ -1,3 +1,15 @@
</span><ins>+2021-11-29  Saam Barati  <sbarati@apple.com>
+
+        FTL's implementation of HasIndexedProperty for InBounds accesses checks the inverse of what it should be checking when exiting by seeing a hole
+        https://bugs.webkit.org/show_bug.cgi?id=233408
+        <rdar://problem/85787251>
+
+        Reviewed by Mark Lam.
+
+        * stress/in-by-val-has-indexed-property-ftl-3.js: Added.
+        * stress/in-by-val-has-indexed-property-ftl-2.js: Added.
+        * stress/in-by-val-has-indexed-property-ftl.js: Added.
+
</ins><span class="cx"> 2021-11-29  Yusuke Suzuki  <ysuzuki@apple.com>
</span><span class="cx"> 
</span><span class="cx">         [JSC] slice should be aware of TerminationException
</span></span></pre></div>
<a id="trunkJSTestsstressinbyvalhasindexedpropertyftl2js"></a>
<div class="addfile"><h4>Added: trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-2.js (0 => 286278)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-2.js                             (rev 0)
+++ trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-2.js        2021-11-30 01:58:37 UTC (rev 286278)
</span><span class="lines">@@ -0,0 +1,28 @@
</span><ins>+//@ runDefault("--validateOptions=true", "--useConcurrentJIT=false", "--useConcurrentGC=false", "--validateBCE=true", "--thresholdForJITSoon=1", "--thresholdForJITAfterWarmUp=7", "--thresholdForOptimizeAfterWarmUp=7", "--thresholdForOptimizeAfterLongWarmUp=7", "--thresholdForOptimizeSoon=1", "--thresholdForFTLOptimizeAfterWarmUp=10")
+
+function assert(b) {
+    if (!b)
+        throw new Error;
+}
+
+function main() {
+    let v17 = {__proto__:[42,1]};
+    v17[2] = 4;
+        
+    let v92 = 0;
+    for (let v95 = 0; v95 < 100; v95++) {
+        function doEvery(e, i) {
+            assert(e === 42);
+            assert(i === 0);
+            function doMap() {
+                v139 = v92++;
+            }   
+            noInline(doMap);
+            [0].map(doMap);
+        }   
+        noInline(doEvery);
+        v17.every(doEvery);
+    }   
+    assert(v139 === 99);
+}
+main();
</ins></span></pre></div>
<a id="trunkJSTestsstressinbyvalhasindexedpropertyftl3js"></a>
<div class="addfile"><h4>Added: trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-3.js (0 => 286278)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-3.js                             (rev 0)
+++ trunk/JSTests/stress/in-by-val-has-indexed-property-ftl-3.js        2021-11-30 01:58:37 UTC (rev 286278)
</span><span class="lines">@@ -0,0 +1,97 @@
</span><ins>+function assert(b) {
+    if (!b)
+        throw new Error;
+}
+
+function test1() {
+    function func(b, o) {
+        if (b)
+            return 2 in o;
+        return false;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[3] = 42;
+
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(!func(false, o));
+    }
+    assert(!func(true, o));
+}
+test1();
+
+function test2() {
+    function func(b, o) {
+        if (b)
+            return 2 in o;
+        return false;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[3] = {};
+
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(!func(false, o));
+    }
+    assert(!func(true, o));
+}
+test2();
+
+function test3() {
+    function func(b, o) {
+        if (b)
+            return 2 in o;
+        return false;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[3] = 42.2;
+
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(!func(false, o));
+    }
+    assert(!func(true, o));
+}
+test3();
+
+function test4() {
+    function func(b, o) {
+        if (b)
+            return 2 in o;
+        return false;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[3] = {};
+    $vm.ensureArrayStorage(o);
+
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(!func(false, o));
+    }
+    assert(!func(true, o));
+}
+test4();
</ins></span></pre></div>
<a id="trunkJSTestsstressinbyvalhasindexedpropertyftljs"></a>
<div class="addfile"><h4>Added: trunk/JSTests/stress/in-by-val-has-indexed-property-ftl.js (0 => 286278)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/JSTests/stress/in-by-val-has-indexed-property-ftl.js                               (rev 0)
+++ trunk/JSTests/stress/in-by-val-has-indexed-property-ftl.js  2021-11-30 01:58:37 UTC (rev 286278)
</span><span class="lines">@@ -0,0 +1,94 @@
</span><ins>+function assert(b) {
+    if (!b)
+        throw new Error;
+}
+
+function test1() {
+    function func(b, o) {
+        if (b)
+            return 0 in o;
+        return true;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[2] = 4;
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(func(false, o));
+    }
+    assert(func(true, o));
+}
+test1();
+
+function test2() {
+    function func(b, o) {
+        if (b)
+            return 0 in o;
+        return true;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[2] = 13.333;
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(func(false, o));
+    }
+    assert(func(true, o));
+}
+test2();
+
+function test3() {
+    function func(b, o) {
+        if (b)
+            return 0 in o;
+        return true;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[2] = {};
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(func(false, o));
+    }
+    assert(func(true, o));
+}
+test3();
+
+function test4() {
+    function func(b, o) {
+        if (b)
+            return 0 in o;
+        return true;
+    }
+    noInline(func);
+
+    let o = {__proto__:[0, 1]};
+    o[2] = {};
+    $vm.ensureArrayStorage(o);
+
+    for (let i = 0; i < 100; ++i) {
+        func(true, o);
+        func(false, o);
+    }
+
+    for (let i = 0; i < 10000; ++i) {
+        assert(func(false, o));
+    }
+    assert(func(true, o));
+}
+test4();
</ins></span></pre></div>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (286277 => 286278)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog    2021-11-30 01:42:49 UTC (rev 286277)
+++ trunk/Source/JavaScriptCore/ChangeLog       2021-11-30 01:58:37 UTC (rev 286278)
</span><span class="lines">@@ -1,3 +1,21 @@
</span><ins>+2021-11-29  Saam Barati  <sbarati@apple.com>
+
+        FTL's implementation of HasIndexedProperty for InBounds accesses checks the inverse of what it should be checking when exiting by seeing a hole
+        https://bugs.webkit.org/show_bug.cgi?id=233408
+        <rdar://problem/85787251>
+
+        Reviewed by Mark Lam.
+
+        The implementation of an InBounds HasIndexedProperty in FTL, when speculating, we
+        would exit when we did not see a hole, not when we did see a hole. This is
+        the inverse of what we need to do, we should exit when we do see a hole.
+
+        * ftl/FTLLowerDFGToB3.cpp:
+        (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
+        * tools/JSDollarVM.cpp:
+        (JSC::JSC_DEFINE_HOST_FUNCTION):
+        (JSC::JSDollarVM::finishCreation):
+
</ins><span class="cx"> 2021-11-29  Yusuke Suzuki  <ysuzuki@apple.com>
</span><span class="cx"> 
</span><span class="cx">         [JSC] slice should be aware of TerminationException
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreftlFTLLowerDFGToB3cpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp (286277 => 286278)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp      2021-11-30 01:42:49 UTC (rev 286277)
+++ trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp 2021-11-30 01:58:37 UTC (rev 286278)
</span><span class="lines">@@ -13322,15 +13322,15 @@
</span><span class="cx">             } else
</span><span class="cx">                 lastNext = m_out.insertNewBlocksBefore(slowCase);
</span><span class="cx"> 
</span><del>-            LValue checkHoleResultValue =
-                m_out.notZero64(m_out.load64(baseIndex(heap, storage, index, m_graph.varArgChild(m_node, 1))));
-            ValueFromBlock checkHoleResult = m_out.anchor(checkHoleResultValue);
</del><ins>+            LValue isHole =
+                m_out.isZero64(m_out.load64(baseIndex(heap, storage, index, m_graph.varArgChild(m_node, 1))));
+            ValueFromBlock checkHoleResult = m_out.anchor(m_out.logicalNot(isHole));
</ins><span class="cx">             if (mode.isInBoundsSaneChain())
</span><span class="cx">                 m_out.jump(continuation);
</span><span class="cx">             else if (!mode.isInBounds())
</span><del>-                m_out.branch(checkHoleResultValue, usually(continuation), rarely(slowCase));
</del><ins>+                m_out.branch(isHole, rarely(slowCase), usually(continuation));
</ins><span class="cx">             else
</span><del>-                speculateAndJump(continuation, LoadFromHole, noValue(), nullptr, checkHoleResultValue);
</del><ins>+                speculateAndJump(continuation, LoadFromHole, noValue(), nullptr, isHole);
</ins><span class="cx"> 
</span><span class="cx">             m_out.appendTo(slowCase, continuation);
</span><span class="cx">             ValueFromBlock slowResult = m_out.anchor(
</span><span class="lines">@@ -13360,14 +13360,14 @@
</span><span class="cx">                 lastNext = m_out.insertNewBlocksBefore(slowCase);
</span><span class="cx"> 
</span><span class="cx">             LValue doubleValue = m_out.loadDouble(baseIndex(heap, storage, index, m_graph.varArgChild(m_node, 1)));
</span><del>-            LValue checkHoleResultValue = m_out.doubleEqual(doubleValue, doubleValue);
-            ValueFromBlock checkHoleResult = m_out.anchor(checkHoleResultValue);
</del><ins>+            LValue notHole = m_out.doubleEqual(doubleValue, doubleValue);
+            ValueFromBlock checkHoleResult = m_out.anchor(notHole);
</ins><span class="cx">             if (mode.isInBoundsSaneChain())
</span><span class="cx">                 m_out.jump(continuation);
</span><span class="cx">             else if (!mode.isInBounds())
</span><del>-                m_out.branch(checkHoleResultValue, usually(continuation), rarely(slowCase));
</del><ins>+                m_out.branch(notHole, usually(continuation), rarely(slowCase));
</ins><span class="cx">             else
</span><del>-                speculateAndJump(continuation, LoadFromHole, noValue(), nullptr, checkHoleResultValue);
</del><ins>+                speculateAndJump(continuation, LoadFromHole, noValue(), nullptr, m_out.logicalNot(notHole));
</ins><span class="cx">             
</span><span class="cx">             m_out.appendTo(slowCase, continuation);
</span><span class="cx">             ValueFromBlock slowResult = m_out.anchor(
</span><span class="lines">@@ -13395,15 +13395,15 @@
</span><span class="cx">             } else
</span><span class="cx">                 lastNext = m_out.insertNewBlocksBefore(slowCase);
</span><span class="cx"> 
</span><del>-            LValue checkHoleResultValue =
-                m_out.notZero64(m_out.load64(baseIndex(m_heaps.ArrayStorage_vector, storage, index, m_graph.varArgChild(m_node, 1))));
-            ValueFromBlock checkHoleResult = m_out.anchor(checkHoleResultValue);
</del><ins>+            LValue isHole =
+                m_out.isZero64(m_out.load64(baseIndex(m_heaps.ArrayStorage_vector, storage, index, m_graph.varArgChild(m_node, 1))));
+            ValueFromBlock checkHoleResult = m_out.anchor(m_out.logicalNot(isHole));
</ins><span class="cx">             if (mode.isInBoundsSaneChain())
</span><span class="cx">                 m_out.jump(continuation);
</span><span class="cx">             else if (!mode.isInBounds())
</span><del>-                m_out.branch(checkHoleResultValue, usually(continuation), rarely(slowCase));
</del><ins>+                m_out.branch(isHole, rarely(slowCase), usually(continuation));
</ins><span class="cx">             else
</span><del>-                speculateAndJump(continuation, LoadFromHole, noValue(), nullptr, checkHoleResultValue);
</del><ins>+                speculateAndJump(continuation, LoadFromHole, noValue(), nullptr, isHole);
</ins><span class="cx"> 
</span><span class="cx">             m_out.appendTo(slowCase, continuation);
</span><span class="cx">             ValueFromBlock slowResult = m_out.anchor(
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoretoolsJSDollarVMcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/tools/JSDollarVM.cpp (286277 => 286278)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/tools/JSDollarVM.cpp 2021-11-30 01:42:49 UTC (rev 286277)
+++ trunk/Source/JavaScriptCore/tools/JSDollarVM.cpp    2021-11-30 01:58:37 UTC (rev 286278)
</span><span class="lines">@@ -2132,6 +2132,8 @@
</span><span class="cx"> static JSC_DECLARE_HOST_FUNCTION(functionResetJITSizeStatistics);
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+static JSC_DECLARE_HOST_FUNCTION(functionEnsureArrayStorage);
+
</ins><span class="cx"> const ClassInfo JSDollarVM::s_info = { "DollarVM", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDollarVM) };
</span><span class="cx"> 
</span><span class="cx"> static EncodedJSValue doPrint(JSGlobalObject* globalObject, CallFrame* callFrame, bool addLineFeed)
</span><span class="lines">@@ -3826,6 +3828,18 @@
</span><span class="cx"> }
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+JSC_DEFINE_HOST_FUNCTION(functionEnsureArrayStorage, (JSGlobalObject* globalObject, CallFrame* callFrame))
+{
+    DollarVMAssertScope assertScope;
+
+    VM& vm = globalObject->vm();
+
+    JSValue arg = callFrame->argument(0);
+    if (arg.isObject())
+        asObject(arg)->ensureArrayStorage(vm);
+    return JSValue::encode(jsUndefined());
+}
+
</ins><span class="cx"> constexpr unsigned jsDollarVMPropertyAttributes = PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | PropertyAttribute::DontDelete;
</span><span class="cx"> 
</span><span class="cx"> void JSDollarVM::finishCreation(VM& vm)
</span><span class="lines">@@ -3996,6 +4010,8 @@
</span><span class="cx">     addFunction(vm, "resetJITSizeStatistics", functionResetJITSizeStatistics, 0);
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+    addFunction(vm, "ensureArrayStorage", functionEnsureArrayStorage, 1);
+
</ins><span class="cx">     m_objectDoingSideEffectPutWithoutCorrectSlotStatusStructure.set(vm, this, ObjectDoingSideEffectPutWithoutCorrectSlotStatus::createStructure(vm, globalObject, jsNull()));
</span><span class="cx"> }
</span><span class="cx"> 
</span></span></pre>
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