Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 0071dfd4f18a9cc5230a2814211ab15d3d43822f
https://github.com/WebKit/WebKit/commit/0071dfd4f18a9cc5230a2814211ab15d3d43822f
Author: Sosuke Suzuki <[email protected]>
Date: 2026-06-27 (Sat, 27 Jun 2026)
Changed paths:
A JSTests/microbenchmarks/is-prototype-of-deep-hit.js
A JSTests/microbenchmarks/is-prototype-of-deep-miss.js
A JSTests/microbenchmarks/is-prototype-of-shallow.js
A JSTests/microbenchmarks/is-prototype-of-sometimes-hit.js
A JSTests/stress/object-is-prototype-of-intrinsic.js
M Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp
M Source/JavaScriptCore/runtime/Intrinsic.h
M Source/JavaScriptCore/runtime/ObjectPrototype.cpp
Log Message:
-----------
[JSC] Use `InstanceOf` DFG node for `Object#isPrototypeOf`
https://bugs.webkit.org/show_bug.cgi?id=317821
Reviewed by Yusuke Suzuki.
Object.prototype.isPrototypeOf was registered without an intrinsic, so DFG/FTL
always emitted a native call. When |this| is an object, isPrototypeOf(V)
performs
exactly the prototype-chain walk of OrdinaryHasInstance, so we can lower it to
the
existing InstanceOf node and reuse its inline cache. We speculate ObjectUse on
|this| and OSR exit to the C++ slow path for primitive receivers; the BadType
exit
profile prevents recompilation loops.
Baseline Patched
is-prototype-of-deep-hit 30.6899+-5.4560 ^ 6.5041+-1.1688 ^
definitely 4.7186x faster
is-prototype-of-sometimes-hit 41.9869+-8.2872 ^ 13.9098+-0.7257 ^
definitely 3.0185x faster
is-prototype-of-deep-miss 35.0449+-2.4496 ^ 6.5066+-1.1866 ^
definitely 5.3860x faster
is-prototype-of-shallow 41.7880+-11.8943 ^ 11.9066+-1.5946 ^
definitely 3.5097x faster
Tests: JSTests/microbenchmarks/is-prototype-of-deep-hit.js
JSTests/microbenchmarks/is-prototype-of-deep-miss.js
JSTests/microbenchmarks/is-prototype-of-shallow.js
JSTests/microbenchmarks/is-prototype-of-sometimes-hit.js
JSTests/stress/object-is-prototype-of-intrinsic.js
* JSTests/microbenchmarks/is-prototype-of-deep-hit.js: Added.
(test):
* JSTests/microbenchmarks/is-prototype-of-deep-miss.js: Added.
(test):
* JSTests/microbenchmarks/is-prototype-of-shallow.js: Added.
(Foo):
(test):
* JSTests/microbenchmarks/is-prototype-of-sometimes-hit.js: Added.
(Foo):
(Bar):
(test):
* JSTests/stress/object-is-prototype-of-intrinsic.js: Added.
(shouldBe):
(shouldThrow):
(A):
(B):
(C):
(miss):
(test):
(Foo):
(Bar):
(getPrototypeOf):
* Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::handleIntrinsicCall):
* Source/JavaScriptCore/runtime/Intrinsic.h:
* Source/JavaScriptCore/runtime/ObjectPrototype.cpp:
(JSC::ObjectPrototype::finishCreation):
Canonical link: https://commits.webkit.org/315966@main
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