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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [JSC] addStaticGlobals should emit SymbolTableEntry watchpoints to encourage constant folding in DFG"
href="https://bugs.webkit.org/show_bug.cgi?id=155110">155110</a>
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<th>Summary</th>
<td>[JSC] addStaticGlobals should emit SymbolTableEntry watchpoints to encourage constant folding in DFG
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>utatane.tea@gmail.com
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<p>
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<pre>Now, (maybe, accidentally), addStaticGlobals does not emit SymbolTableEntry watchpoints for the added entries.
So, all the global variable lookups pointing to these static globals are not converted into constants in BytecodeGenerator: this fact leaves these lookups as GetGlobalVar.
But, static globals are not configurable. And they are typically non-writable. So they are constant in almost all the cases.
This patch initializes watchpoints for these static globals. These watchpoints allow DFG to convert these nodes into constants in DFG BytecodeParser.
These watchpoints includes some builtin operations and `undefined`!</pre>
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