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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/286083">286083</a></dd>
<dt>Author</dt> <dd>commit-queue@webkit.org</dd>
<dt>Date</dt> <dd>2021-11-19 15:19:44 -0800 (Fri, 19 Nov 2021)</dd>
</dl>

<h3>Log Message</h3>
<pre>Unreviewed, reverting <a href="http://trac.webkit.org/projects/webkit/changeset/286030">r286030</a>.
https://bugs.webkit.org/show_bug.cgi?id=233387

5% JetStream2 regression

Reverted changeset:

"DFGByteCodeParser.cpp should avoid resizing the Operands<> of
every BasicBlock on every inlining"
https://bugs.webkit.org/show_bug.cgi?id=228053
https://commits.webkit.org/<a href="http://trac.webkit.org/projects/webkit/changeset/286030">r286030</a></pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCorebytecodeOperandsh">trunk/Source/JavaScriptCore/bytecode/Operands.h</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGBasicBlockcpp">trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGBasicBlockh">trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.h</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGByteCodeParsercpp">trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (286082 => 286083)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog    2021-11-19 23:14:48 UTC (rev 286082)
+++ trunk/Source/JavaScriptCore/ChangeLog       2021-11-19 23:19:44 UTC (rev 286083)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2021-11-19  Commit Queue  <commit-queue@webkit.org>
+
+        Unreviewed, reverting r286030.
+        https://bugs.webkit.org/show_bug.cgi?id=233387
+
+        5% JetStream2 regression
+
+        Reverted changeset:
+
+        "DFGByteCodeParser.cpp should avoid resizing the Operands<> of
+        every BasicBlock on every inlining"
+        https://bugs.webkit.org/show_bug.cgi?id=228053
+        https://commits.webkit.org/r286030
+
</ins><span class="cx"> 2021-11-19  Saam Barati  <sbarati@apple.com>
</span><span class="cx"> 
</span><span class="cx">         Fix assertion added in r285592
</span></span></pre></div>
<a id="trunkSourceJavaScriptCorebytecodeOperandsh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/bytecode/Operands.h (286082 => 286083)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/bytecode/Operands.h  2021-11-19 23:14:48 UTC (rev 286082)
+++ trunk/Source/JavaScriptCore/bytecode/Operands.h     2021-11-19 23:19:44 UTC (rev 286083)
</span><span class="lines">@@ -274,25 +274,16 @@
</span><span class="cx">         }
</span><span class="cx">     }
</span><span class="cx"> 
</span><del>-    void ensureLocalsAndTmps(size_t newNumLocals, size_t newNumTmps, const T& ensuredValue = T())
</del><ins>+    void ensureTmps(size_t size, const T& ensuredValue = T())
</ins><span class="cx">     {
</span><del>-        ASSERT(newNumLocals >= numberOfLocals());
-        ASSERT(newNumTmps >= numberOfTmps());
</del><ins>+        if (size <= numberOfTmps())
+            return;
</ins><span class="cx"> 
</span><del>-        size_t oldNumLocals = numberOfLocals();
-        size_t oldNumTmps = numberOfTmps();
-
</del><span class="cx">         size_t oldSize = m_values.size();
</span><del>-        size_t newSize = numberOfArguments() + newNumLocals + newNumTmps;
</del><ins>+        size_t newSize = numberOfArguments() + numberOfLocals() + size;
</ins><span class="cx">         m_values.grow(newSize);
</span><span class="cx"> 
</span><del>-        for (size_t i = 0; i < oldNumTmps; ++i)
-            m_values[newSize - 1 - i] = m_values[tmpIndex(oldNumTmps - 1 - i)];
-
-        m_numLocals = newNumLocals;
</del><span class="cx">         if (ensuredValue != T() || !WTF::VectorTraits<T>::needsInitialization) {
</span><del>-            for (size_t i = 0; i < newNumLocals - oldNumLocals; ++i)
-                m_values[localIndex(oldNumLocals + i)] = ensuredValue;
</del><span class="cx">             for (size_t i = oldSize; i < newSize; ++i)
</span><span class="cx">                 m_values[i] = ensuredValue;
</span><span class="cx">         }
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGBasicBlockcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.cpp (286082 => 286083)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.cpp        2021-11-19 23:14:48 UTC (rev 286082)
+++ trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.cpp   2021-11-19 23:19:44 UTC (rev 286083)
</span><span class="lines">@@ -63,6 +63,24 @@
</span><span class="cx"> {
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void BasicBlock::ensureLocals(unsigned newNumLocals)
+{
+    variablesAtHead.ensureLocals(newNumLocals);
+    variablesAtTail.ensureLocals(newNumLocals);
+    valuesAtHead.ensureLocals(newNumLocals);
+    valuesAtTail.ensureLocals(newNumLocals);
+    intersectionOfPastValuesAtHead.ensureLocals(newNumLocals, AbstractValue::fullTop());
+}
+
+void BasicBlock::ensureTmps(unsigned newNumTmps)
+{
+    variablesAtHead.ensureTmps(newNumTmps);
+    variablesAtTail.ensureTmps(newNumTmps);
+    valuesAtHead.ensureTmps(newNumTmps);
+    valuesAtTail.ensureTmps(newNumTmps);
+    intersectionOfPastValuesAtHead.ensureTmps(newNumTmps, AbstractValue::fullTop());
+}
+
</ins><span class="cx"> void BasicBlock::replaceTerminal(Graph& graph, Node* node)
</span><span class="cx"> {
</span><span class="cx">     NodeAndIndex result = findTerminal();
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGBasicBlockh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.h (286082 => 286083)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.h  2021-11-19 23:14:48 UTC (rev 286082)
+++ trunk/Source/JavaScriptCore/dfg/DFGBasicBlock.h     2021-11-19 23:19:44 UTC (rev 286083)
</span><span class="lines">@@ -53,6 +53,9 @@
</span><span class="cx">         float executionCount);
</span><span class="cx">     ~BasicBlock();
</span><span class="cx">     
</span><ins>+    void ensureLocals(unsigned newNumLocals);
+    void ensureTmps(unsigned newNumTmps);
+    
</ins><span class="cx">     size_t size() const { return m_nodes.size(); }
</span><span class="cx">     bool isEmpty() const { return !size(); }
</span><span class="cx">     Node*& at(size_t i) { return m_nodes[i]; }
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGByteCodeParsercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp (286082 => 286083)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp    2021-11-19 23:14:48 UTC (rev 286082)
+++ trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp       2021-11-19 23:19:44 UTC (rev 286083)
</span><span class="lines">@@ -138,7 +138,7 @@
</span><span class="cx">     // Just parse from m_currentIndex to the end of the current CodeBlock.
</span><span class="cx">     void parseCodeBlock();
</span><span class="cx">     
</span><del>-    void ensureLocalsForVariablesAtTail(unsigned newNumLocals)
</del><ins>+    void ensureLocals(unsigned newNumLocals)
</ins><span class="cx">     {
</span><span class="cx">         VERBOSE_LOG("   ensureLocals: trying to raise m_numLocals from ", m_numLocals, " to ", newNumLocals, "\n");
</span><span class="cx">         if (newNumLocals <= m_numLocals)
</span><span class="lines">@@ -145,18 +145,17 @@
</span><span class="cx">             return;
</span><span class="cx">         m_numLocals = newNumLocals;
</span><span class="cx">         for (size_t i = 0; i < m_graph.numBlocks(); ++i)
</span><del>-            m_graph.block(i)->variablesAtTail.ensureLocals(newNumLocals);
</del><ins>+            m_graph.block(i)->ensureLocals(newNumLocals);
</ins><span class="cx">     }
</span><span class="cx"> 
</span><del>-    void ensureLocalsAndTmpsForVariablesAtTail(unsigned newNumLocals, unsigned newNumTmps)
</del><ins>+    void ensureTmps(unsigned newNumTmps)
</ins><span class="cx">     {
</span><del>-        VERBOSE_LOG("   ensureLocalsAndTmps: trying to raise m_numLocals/m_numTmps from ", m_numLocals, "/", m_numTmps, " to ", newNumLocals, "/", newNumTmps, "\n");
-        if (newNumLocals <= m_numLocals && newNumTmps <= m_numTmps)
</del><ins>+        VERBOSE_LOG("   ensureTmps: trying to raise m_numTmps from ", m_numTmps, " to ", newNumTmps, "\n");
+        if (newNumTmps <= m_numTmps)
</ins><span class="cx">             return;
</span><del>-        m_numLocals = std::max(m_numLocals, newNumLocals);
-        m_numTmps = std::max(m_numTmps, newNumTmps);
</del><ins>+        m_numTmps = newNumTmps;
</ins><span class="cx">         for (size_t i = 0; i < m_graph.numBlocks(); ++i)
</span><del>-            m_graph.block(i)->variablesAtTail.ensureLocalsAndTmps(m_numLocals, m_numTmps);
</del><ins>+            m_graph.block(i)->ensureTmps(newNumTmps);
</ins><span class="cx">     }
</span><span class="cx"> 
</span><span class="cx"> 
</span><span class="lines">@@ -172,8 +171,6 @@
</span><span class="cx">     // than to move the right index all the way to the treatment of op_ret.
</span><span class="cx">     BasicBlock* allocateTargetableBlock(BytecodeIndex);
</span><span class="cx">     BasicBlock* allocateUntargetableBlock();
</span><del>-    // Helper for allocateTargetableBlock and allocateUntargetableBlock, do not use directly
-    BasicBlock* allocateBlock(BytecodeIndex);
</del><span class="cx">     // An untargetable block can be given a bytecodeIndex to be later managed by linkBlock, but only once, and it can never go in the other direction
</span><span class="cx">     void makeBlockTargetable(BasicBlock*, BytecodeIndex);
</span><span class="cx">     void addJumpTo(BasicBlock*);
</span><span class="lines">@@ -1265,32 +1262,24 @@
</span><span class="cx">     bool m_hasAnyForceOSRExits { false };
</span><span class="cx"> };
</span><span class="cx"> 
</span><del>-BasicBlock* ByteCodeParser::allocateBlock(BytecodeIndex bytecodeIndex)
-{
-    // We don't bother initializing most Operands here, since inlining can change the number of locals and tmps.
-    // We only initialize variablesAtTail because it is the only part which is used in the bytecode parser
-    // We will initialize all of the other Operands in bulk at the end of the phase.
-    Ref<BasicBlock> block = adoptRef(*new BasicBlock(bytecodeIndex, 0, 0, 0, 1));
-    BasicBlock* blockPtr = block.ptr();
-    blockPtr->variablesAtTail = Operands<Node*>(m_numArguments, m_numLocals, m_numTmps);
-    m_graph.appendBlock(WTFMove(block));
-    return blockPtr;
-}
-
</del><span class="cx"> BasicBlock* ByteCodeParser::allocateTargetableBlock(BytecodeIndex bytecodeIndex)
</span><span class="cx"> {
</span><span class="cx">     ASSERT(bytecodeIndex);
</span><ins>+    Ref<BasicBlock> block = adoptRef(*new BasicBlock(bytecodeIndex, m_numArguments, m_numLocals, m_numTmps, 1));
+    BasicBlock* blockPtr = block.ptr();
</ins><span class="cx">     // m_blockLinkingTargets must always be sorted in increasing order of bytecodeBegin
</span><span class="cx">     if (m_inlineStackTop->m_blockLinkingTargets.size())
</span><span class="cx">         ASSERT(m_inlineStackTop->m_blockLinkingTargets.last()->bytecodeBegin.offset() < bytecodeIndex.offset());
</span><del>-    BasicBlock* blockPtr = allocateBlock(bytecodeIndex);
</del><span class="cx">     m_inlineStackTop->m_blockLinkingTargets.append(blockPtr);
</span><ins>+    m_graph.appendBlock(WTFMove(block));
</ins><span class="cx">     return blockPtr;
</span><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> BasicBlock* ByteCodeParser::allocateUntargetableBlock()
</span><span class="cx"> {
</span><del>-    BasicBlock* blockPtr = allocateBlock(BytecodeIndex());
</del><ins>+    Ref<BasicBlock> block = adoptRef(*new BasicBlock(BytecodeIndex(), m_numArguments, m_numLocals, m_numTmps, 1));
+    BasicBlock* blockPtr = block.ptr();
+    m_graph.appendBlock(WTFMove(block));
</ins><span class="cx">     VERBOSE_LOG("Adding new untargetable block: ", blockPtr->index, "\n");
</span><span class="cx">     return blockPtr;
</span><span class="cx"> }
</span><span class="lines">@@ -1688,9 +1677,11 @@
</span><span class="cx">     
</span><span class="cx">     Operand inlineCallFrameStart = VirtualRegister(m_inlineStackTop->remapOperand(VirtualRegister(registerOffsetAfterFixup)).value() + CallFrame::headerSizeInRegisters);
</span><span class="cx">     
</span><del>-    unsigned numLocals = inlineCallFrameStart.toLocal() + 1 + CallFrame::headerSizeInRegisters + codeBlock->numCalleeLocals();
-    unsigned numTmps = (m_inlineStackTop->m_inlineCallFrame ? m_inlineStackTop->m_inlineCallFrame->tmpOffset : 0) + m_inlineStackTop->m_codeBlock->numTmps() + codeBlock->numTmps();
-    ensureLocalsAndTmpsForVariablesAtTail(numLocals, numTmps);
</del><ins>+    ensureLocals(
+        inlineCallFrameStart.toLocal() + 1 +
+        CallFrame::headerSizeInRegisters + codeBlock->numCalleeLocals());
+    
+    ensureTmps((m_inlineStackTop->m_inlineCallFrame ? m_inlineStackTop->m_inlineCallFrame->tmpOffset : 0) + m_inlineStackTop->m_codeBlock->numTmps() + codeBlock->numTmps());
</ins><span class="cx"> 
</span><span class="cx">     size_t argumentPositionStart = m_graph.m_argumentPositions.size();
</span><span class="cx"> 
</span><span class="lines">@@ -2003,7 +1994,7 @@
</span><span class="cx">         int remappedRegisterOffset =
</span><span class="cx">         m_inlineStackTop->remapOperand(VirtualRegister(registerOffset)).virtualRegister().offset();
</span><span class="cx">         
</span><del>-        ensureLocalsForVariablesAtTail(VirtualRegister(remappedRegisterOffset).toLocal());
</del><ins>+        ensureLocals(VirtualRegister(remappedRegisterOffset).toLocal());
</ins><span class="cx">         
</span><span class="cx">         int argumentStart = registerOffset + CallFrame::headerSizeInRegisters;
</span><span class="cx">         int remappedArgumentStart = m_inlineStackTop->remapOperand(VirtualRegister(argumentStart)).virtualRegister().offset();
</span><span class="lines">@@ -4800,7 +4791,7 @@
</span><span class="cx">         stackAlignmentRegisters(),
</span><span class="cx">         -registerOffset);
</span><span class="cx">     
</span><del>-    ensureLocalsForVariablesAtTail(
</del><ins>+    ensureLocals(
</ins><span class="cx">         m_inlineStackTop->remapOperand(
</span><span class="cx">             VirtualRegister(registerOffset)).toLocal());
</span><span class="cx">     
</span><span class="lines">@@ -5194,7 +5185,7 @@
</span><span class="cx">             stackAlignmentRegisters(),
</span><span class="cx">             -registerOffset);
</span><span class="cx">     
</span><del>-        ensureLocalsForVariablesAtTail(
</del><ins>+        ensureLocals(
</ins><span class="cx">             m_inlineStackTop->remapOperand(
</span><span class="cx">                 VirtualRegister(registerOffset)).toLocal());
</span><span class="cx">     
</span><span class="lines">@@ -9049,17 +9040,6 @@
</span><span class="cx">     parseCodeBlock();
</span><span class="cx">     linkBlocks(inlineStackEntry.m_unlinkedBlocks, inlineStackEntry.m_blockLinkingTargets);
</span><span class="cx"> 
</span><del>-    for (BasicBlock* block : m_graph.blocksInNaturalOrder()) {
-        // We kept block->variablesAtTail updated throughout, but not the other Operands, to avoid having to resize them every time we inline
-        ASSERT(block->variablesAtTail.numberOfArguments() == m_numArguments);
-        ASSERT(block->variablesAtTail.numberOfLocals() == m_numLocals);
-        ASSERT(block->variablesAtTail.numberOfTmps() == m_numTmps);
-        block->variablesAtHead = Operands<Node*>(OperandsLike, block->variablesAtTail);
-        block->valuesAtHead = Operands<AbstractValue>(OperandsLike, block->variablesAtTail);
-        block->valuesAtTail = Operands<AbstractValue>(OperandsLike, block->variablesAtTail);
-        block->intersectionOfPastValuesAtHead = Operands<AbstractValue>(OperandsLike, block->variablesAtTail);
-    }
-
</del><span class="cx">     // We run backwards propagation now because the soundness of that phase
</span><span class="cx">     // relies on seeing the graph as if it were an IR over bytecode, since
</span><span class="cx">     // the spec-correctness of that phase relies on seeing all bytecode uses.
</span><span class="lines">@@ -9176,6 +9156,16 @@
</span><span class="cx">     m_graph.determineReachability();
</span><span class="cx">     m_graph.killUnreachableBlocks();
</span><span class="cx"> 
</span><ins>+    for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
+        BasicBlock* block = m_graph.block(blockIndex);
+        if (!block)
+            continue;
+        ASSERT(block->variablesAtHead.numberOfLocals() == m_graph.block(0)->variablesAtHead.numberOfLocals());
+        ASSERT(block->variablesAtHead.numberOfArguments() == m_graph.block(0)->variablesAtHead.numberOfArguments());
+        ASSERT(block->variablesAtTail.numberOfLocals() == m_graph.block(0)->variablesAtHead.numberOfLocals());
+        ASSERT(block->variablesAtTail.numberOfArguments() == m_graph.block(0)->variablesAtHead.numberOfArguments());
+    }
+
</ins><span class="cx">     m_graph.m_tmps = m_numTmps;
</span><span class="cx">     m_graph.m_localVars = m_numLocals;
</span><span class="cx">     m_graph.m_parameterSlots = m_parameterSlots;
</span></span></pre>
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