Bug 165511 - WebAssembly: bit-pack signature and code for call_indirect
Summary: WebAssembly: bit-pack signature and code for call_indirect
Alias: None
Product: WebKit
Classification: Unclassified
Component: JavaScriptCore (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
Depends on: 165118 165957
Blocks: 161709
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Reported: 2016-12-06 21:06 PST by JF Bastien
Modified: 2020-01-24 09:18 PST (History)
3 users (show)

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Description JF Bastien 2016-12-06 21:06:10 PST
See WasmFormat.h, CallableFunction and FunctionIndexSpace.
Uniquing signatures is required for correctness, and packing the signature into the code pointer will make call_indirect faster (it just needs to rotate the packed signature, check it's the expected value, and then mask it out before jumping).