[Webkit-unassigned] [Bug 178390] New: Support recursive tail call optimization for polymorphic calls

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Oct 17 09:01:59 PDT 2017


            Bug ID: 178390
           Summary: Support recursive tail call optimization for
                    polymorphic calls
           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: rmorisset at apple.com
        Depends on: 176601

There is currently code in DFGByteCodeParser.cpp::handleInlining(...) that turns a polymorphic call into a switch on the value of the callee, with fast paths for each frequently called callee. This enables the calls to be inlined, but currently if one is a recursive tail call it cannot be optimized as in https://bugs.webkit.org/show_bug.cgi?id=176601. This is an unnecessary restriction.

Referenced Bugs:

[Bug 176601] Turn recursive tail calls into loops
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