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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/285452">285452</a></dd>
<dt>Author</dt> <dd>kocsen_chung@apple.com</dd>
<dt>Date</dt> <dd>2021-11-08 17:08:35 -0800 (Mon, 08 Nov 2021)</dd>
</dl>
<h3>Log Message</h3>
<pre>Cherry-pick <a href="http://trac.webkit.org/projects/webkit/changeset/282212">r282212</a>. rdar://problem/85165960
Differential testing: incorrect constant propagation around Uint8ClampedArray
https://bugs.webkit.org/show_bug.cgi?id=229869
JSTests:
Reviewed by Saam Barati.
* stress/Uint8ClampedArrayClampsInt52Positive.js: Added.
(let.x.123.test):
(noInline.test.int32pos1):
(255.int32pos2):
(1.int32neg1):
(0.int32neg2):
(0.int52pos1):
(255.int52pos2):
(255.int52neg1):
(0.int52neg2):
(0.int52neg3):
(0.int52pos3):
(255.int8):
Source/JavaScriptCore:
We casted int52 values to int32 before clamping, which caused any value with the 32nd bit
set to be interpreted as negative. The fix is to check the full-size value when deciding to clamp.
Reviewed by Saam Barati.
* ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@282212 268f45cc-cd09-0410-ab3c-d52691b4dbfc</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari612branchJSTestsChangeLog">branches/safari-612-branch/JSTests/ChangeLog</a></li>
<li><a href="#branchessafari612branchSourceJavaScriptCoreChangeLog">branches/safari-612-branch/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchessafari612branchSourceJavaScriptCoreftlFTLLowerDFGToB3cpp">branches/safari-612-branch/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#branchessafari612branchJSTestsstressUint8ClampedArrayClampsInt52Positivejs">branches/safari-612-branch/JSTests/stress/Uint8ClampedArrayClampsInt52Positive.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari612branchJSTestsChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-612-branch/JSTests/ChangeLog (285451 => 285452)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-612-branch/JSTests/ChangeLog 2021-11-09 01:08:32 UTC (rev 285451)
+++ branches/safari-612-branch/JSTests/ChangeLog 2021-11-09 01:08:35 UTC (rev 285452)
</span><span class="lines">@@ -1,3 +1,62 @@
</span><ins>+2021-11-08 Kocsen Chung <kocsen_chung@apple.com>
+
+ Cherry-pick r282212. rdar://problem/85165960
+
+ Differential testing: incorrect constant propagation around Uint8ClampedArray
+ https://bugs.webkit.org/show_bug.cgi?id=229869
+
+ JSTests:
+
+ Reviewed by Saam Barati.
+
+ * stress/Uint8ClampedArrayClampsInt52Positive.js: Added.
+ (let.x.123.test):
+ (noInline.test.int32pos1):
+ (255.int32pos2):
+ (1.int32neg1):
+ (0.int32neg2):
+ (0.int52pos1):
+ (255.int52pos2):
+ (255.int52neg1):
+ (0.int52neg2):
+ (0.int52neg3):
+ (0.int52pos3):
+ (255.int8):
+
+ Source/JavaScriptCore:
+
+ We casted int52 values to int32 before clamping, which caused any value with the 32nd bit
+ set to be interpreted as negative. The fix is to check the full-size value when deciding to clamp.
+
+ Reviewed by Saam Barati.
+
+ * ftl/FTLLowerDFGToB3.cpp:
+ (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
+
+
+ git-svn-id: https://svn.webkit.org/repository/webkit/trunk@282212 268f45cc-cd09-0410-ab3c-d52691b4dbfc
+
+ 2021-09-09 Justin Michaud <justin_michaud@apple.com>
+
+ Differential testing: incorrect constant propagation around Uint8ClampedArray
+ https://bugs.webkit.org/show_bug.cgi?id=229869
+
+ Reviewed by Saam Barati.
+
+ * stress/Uint8ClampedArrayClampsInt52Positive.js: Added.
+ (let.x.123.test):
+ (noInline.test.int32pos1):
+ (255.int32pos2):
+ (1.int32neg1):
+ (0.int32neg2):
+ (0.int52pos1):
+ (255.int52pos2):
+ (255.int52neg1):
+ (0.int52neg2):
+ (0.int52neg3):
+ (0.int52pos3):
+ (255.int8):
+
</ins><span class="cx"> 2021-11-04 Russell Epstein <repstein@apple.com>
</span><span class="cx">
</span><span class="cx"> Cherry-pick r283512. rdar://problem/85034084
</span></span></pre></div>
<a id="branchessafari612branchJSTestsstressUint8ClampedArrayClampsInt52Positivejs"></a>
<div class="addfile"><h4>Added: branches/safari-612-branch/JSTests/stress/Uint8ClampedArrayClampsInt52Positive.js (0 => 285452)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-612-branch/JSTests/stress/Uint8ClampedArrayClampsInt52Positive.js (rev 0)
+++ branches/safari-612-branch/JSTests/stress/Uint8ClampedArrayClampsInt52Positive.js 2021-11-09 01:08:35 UTC (rev 285452)
</span><span class="lines">@@ -0,0 +1,79 @@
</span><ins>+let x = 123
+
+function test(fn, expected) {
+ for (let i = 0; i < 10000; i++) {
+ const arr = new Uint8ClampedArray(1)
+ fn(arr)
+ x = arr[0]
+ }
+
+ if (x != expected)
+ throw new Error(`Clamping was done incorrectly ${x}, expected ${expected} in ${fn}`)
+}
+noInline(test)
+
+function int32pos1(arr) {
+ arr[0] = 0x70000001|0
+}
+noInline(int32pos1)
+test(int32pos1, 255)
+
+function int32pos2(arr) {
+ arr[0] = 0x800000001|0
+}
+noInline(int32pos2)
+test(int32pos2, 1)
+
+function int32neg1(arr) {
+ arr[0] = 0x80000001|0
+}
+noInline(int32neg1)
+test(int32neg1, 0)
+
+function int32neg2(arr) {
+ arr[0] = 0x80000000|0
+}
+noInline(int32neg2)
+test(int32neg2, 0)
+
+function int52pos1(arr) {
+ arr[0] = 0x80000001
+}
+noInline(int52pos1)
+test(int52pos1, 255)
+
+function int52pos2(arr) {
+ arr[0] = 0x80000000
+}
+noInline(int52pos2)
+test(int52pos2, 255)
+
+function int52neg1(arr) {
+ arr[0] = -0x80000001
+}
+noInline(int52neg1)
+test(int52neg1, 0)
+
+function int52neg2(arr) {
+ arr[0] = -0x80000000
+}
+noInline(int52neg2)
+test(int52neg2, 0)
+
+function int52neg3(arr) {
+ arr[0] = -0x0008_0000_0000_0000
+}
+noInline(int52neg3)
+test(int52neg3, 0)
+
+function int52pos3(arr) {
+ arr[0] = 0x0007_FFFF_FFFF_FFFF
+}
+noInline(int52pos3)
+test(int52pos3, 255)
+
+function int8(arr) {
+ arr[0] = 0x8000000fe - 0x800000000
+}
+noInline(int8)
+test(int8, 254)
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="branchessafari612branchSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-612-branch/Source/JavaScriptCore/ChangeLog (285451 => 285452)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-612-branch/Source/JavaScriptCore/ChangeLog 2021-11-09 01:08:32 UTC (rev 285451)
+++ branches/safari-612-branch/Source/JavaScriptCore/ChangeLog 2021-11-09 01:08:35 UTC (rev 285452)
</span><span class="lines">@@ -1,3 +1,54 @@
</span><ins>+2021-11-08 Kocsen Chung <kocsen_chung@apple.com>
+
+ Cherry-pick r282212. rdar://problem/85165960
+
+ Differential testing: incorrect constant propagation around Uint8ClampedArray
+ https://bugs.webkit.org/show_bug.cgi?id=229869
+
+ JSTests:
+
+ Reviewed by Saam Barati.
+
+ * stress/Uint8ClampedArrayClampsInt52Positive.js: Added.
+ (let.x.123.test):
+ (noInline.test.int32pos1):
+ (255.int32pos2):
+ (1.int32neg1):
+ (0.int32neg2):
+ (0.int52pos1):
+ (255.int52pos2):
+ (255.int52neg1):
+ (0.int52neg2):
+ (0.int52neg3):
+ (0.int52pos3):
+ (255.int8):
+
+ Source/JavaScriptCore:
+
+ We casted int52 values to int32 before clamping, which caused any value with the 32nd bit
+ set to be interpreted as negative. The fix is to check the full-size value when deciding to clamp.
+
+ Reviewed by Saam Barati.
+
+ * ftl/FTLLowerDFGToB3.cpp:
+ (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
+
+
+ git-svn-id: https://svn.webkit.org/repository/webkit/trunk@282212 268f45cc-cd09-0410-ab3c-d52691b4dbfc
+
+ 2021-09-09 Justin Michaud <justin_michaud@apple.com>
+
+ Differential testing: incorrect constant propagation around Uint8ClampedArray
+ https://bugs.webkit.org/show_bug.cgi?id=229869
+
+ We casted int52 values to int32 before clamping, which caused any value with the 32nd bit
+ set to be interpreted as negative. The fix is to check the full-size value when deciding to clamp.
+
+ Reviewed by Saam Barati.
+
+ * ftl/FTLLowerDFGToB3.cpp:
+ (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
+
</ins><span class="cx"> 2021-11-04 Russell Epstein <repstein@apple.com>
</span><span class="cx">
</span><span class="cx"> Cherry-pick r284036. rdar://problem/85034297
</span></span></pre></div>
<a id="branchessafari612branchSourceJavaScriptCoreftlFTLLowerDFGToB3cpp"></a>
<div class="modfile"><h4>Modified: branches/safari-612-branch/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp (285451 => 285452)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-612-branch/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp 2021-11-09 01:08:32 UTC (rev 285451)
+++ branches/safari-612-branch/Source/JavaScriptCore/ftl/FTLLowerDFGToB3.cpp 2021-11-09 01:08:35 UTC (rev 285452)
</span><span class="lines">@@ -17857,15 +17857,26 @@
</span><span class="cx">
</span><span class="cx"> LValue getIntTypedArrayStoreOperand(Edge edge, bool isClamped = false)
</span><span class="cx"> {
</span><del>- LValue intValue;
</del><ins>+ LValue valueAsInt32;
+ LValue value;
+ LValue zero;
+ LValue byteMax;
+
</ins><span class="cx"> switch (edge.useKind()) {
</span><span class="cx"> case Int52RepUse:
</span><span class="cx"> case Int32Use: {
</span><del>- if (edge.useKind() == Int32Use)
- intValue = lowInt32(edge);
- else
- intValue = m_out.castToInt32(lowStrictInt52(edge));
-
</del><ins>+ if (edge.useKind() == Int32Use) {
+ value = lowInt32(edge);
+ valueAsInt32 = value;
+ zero = m_out.int32Zero;
+ byteMax = m_out.constInt32(255);
+ } else {
+ value = lowStrictInt52(edge);
+ valueAsInt32 = m_out.castToInt32(value);
+ zero = m_out.int64Zero;
+ byteMax = m_out.constInt64(255);
+ }
+
</ins><span class="cx"> if (isClamped) {
</span><span class="cx"> LBasicBlock atLeastZero = m_out.newBlock();
</span><span class="cx"> LBasicBlock continuation = m_out.newBlock();
</span><span class="lines">@@ -17873,19 +17884,19 @@
</span><span class="cx"> Vector<ValueFromBlock, 2> intValues;
</span><span class="cx"> intValues.append(m_out.anchor(m_out.int32Zero));
</span><span class="cx"> m_out.branch(
</span><del>- m_out.lessThan(intValue, m_out.int32Zero),
</del><ins>+ m_out.lessThan(value, zero),
</ins><span class="cx"> unsure(continuation), unsure(atLeastZero));
</span><span class="cx">
</span><span class="cx"> LBasicBlock lastNext = m_out.appendTo(atLeastZero, continuation);
</span><span class="cx">
</span><span class="cx"> intValues.append(m_out.anchor(m_out.select(
</span><del>- m_out.greaterThan(intValue, m_out.constInt32(255)),
</del><ins>+ m_out.greaterThan(value, byteMax),
</ins><span class="cx"> m_out.constInt32(255),
</span><del>- intValue)));
</del><ins>+ valueAsInt32)));
</ins><span class="cx"> m_out.jump(continuation);
</span><span class="cx">
</span><span class="cx"> m_out.appendTo(continuation, lastNext);
</span><del>- intValue = m_out.phi(Int32, intValues);
</del><ins>+ valueAsInt32 = m_out.phi(Int32, intValues);
</ins><span class="cx"> }
</span><span class="cx"> break;
</span><span class="cx"> }
</span><span class="lines">@@ -17915,9 +17926,9 @@
</span><span class="cx"> m_out.jump(continuation);
</span><span class="cx">
</span><span class="cx"> m_out.appendTo(continuation, lastNext);
</span><del>- intValue = m_out.phi(Int32, intValues);
</del><ins>+ valueAsInt32 = m_out.phi(Int32, intValues);
</ins><span class="cx"> } else
</span><del>- intValue = doubleToInt32(doubleValue);
</del><ins>+ valueAsInt32 = doubleToInt32(doubleValue);
</ins><span class="cx"> break;
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -17925,7 +17936,7 @@
</span><span class="cx"> DFG_CRASH(m_graph, m_node, "Bad use kind");
</span><span class="cx"> }
</span><span class="cx">
</span><del>- return intValue;
</del><ins>+ return valueAsInt32;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> LValue doubleToInt32(LValue doubleValue, double low, double high, bool isSigned = true)
</span></span></pre>
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