[Webkit-unassigned] [Bug 194084] New: [JSC] Do not use InferredValue in non-JIT configuration

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jan 30 23:49:25 PST 2019


            Bug ID: 194084
           Summary: [JSC] Do not use InferredValue in non-JIT
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ysuzuki at apple.com

This is typically used to identify that the given value is a singleton. And held value and watchpoint are used in DFG / FTL to make that value constant.
This is allocated for each JSFunction and SymbolTable. It is

1. Costly. Since this also requires IsoSubspace, IsoCellSet, and finalizers.
2. While this InferredValue is also used in ObjectAllocationProfile to check the possibility of poly proto, InlinedWatchpoint is enough for this use case.

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