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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [JSC] Add @throwTypeError bytecode intrinsic"
href="https://bugs.webkit.org/show_bug.cgi?id=162995">162995</a>
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<th>Summary</th>
<td>[JSC] Add @throwTypeError bytecode intrinsic
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
</td>
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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>In builtin JS, there are so many `throw @TypeError(".....");` things.
But it spreads so large byte code sequence, effectively enlarges the size of bytecodes, and prevent us from inlining!
[ 15] resolve_scope loc8, loc3, PrivateSymbol.TypeError(@id0), <GlobalVar>, 0, 0x110bdc0a0
[ 22] get_from_scope loc9, loc8, PrivateSymbol.TypeError(@id0), 2049<ThrowIfNotFound|GlobalVar|NotInitialization>, 238692432 predicting None
[ 30] mov loc12, loc9
[ 33] mov loc11, String (atomic) (identifier): Properties can only be defined on Objects., ID: 4(const0)
[ 36] construct loc9, loc9, 2, 18 (this at loc12) status(Could Take Slow Path) predicting None
[ 45] throw loc9
[ 47] ...
Oh, it bloats 32 intructions! We already have great solution. Let's emit op_throw_static_error instead (size is only 3).</pre>
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