• mbrandy's avatar
    PPC: Type Feedback Vector lives in the closure · 753ad25e
    mbrandy authored
    Port bb31db3a
    
    Original commit message:
        (RELAND: the problem before was a missing write barrier for adding the code
        entry to the new closure. It's been addressed with a new macro instruction
        and test. The only change to this CL is the addition of two calls to
        __ RecordWriteCodeEntryField() in the platform CompileLazy builtin.)
    
        We get less "pollution" of type feedback if we have one vector per native
        context, rather than one for the whole system. This CL moves the vector
        appropriately.
    
        We rely more heavily on the Optimized Code Map in the SharedFunctionInfo. The
        vector actually lives in the first slot of the literals array (indeed there is
        great commonality between those arrays, they can be thought of as the same
        thing). So we make greater effort to ensure there is a valid literals array
        after compilation.
    
        This meant, for performance reasons, that we needed to extend
        FastNewClosureStub to support creating closures with literals. And ultimately,
        it drove us to move the optimized code map lookup out of FastNewClosureStub
        and into the compile lazy builtin.
    
        The heap change is trivial so I TBR Hannes for it...
        Also, Yang has had a look at the debugger changes already and approved 'em. So he is TBR style too.
        And Benedikt reviewed it as well.
    
    R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
    BUG=
    
    Review URL: https://codereview.chromium.org/1671553002
    
    Cr-Commit-Position: refs/heads/master@{#33753}
    753ad25e
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