• zhengxing.li's avatar
    X87: Type Feedback Vector lives in the closure. · 25bfba93
    zhengxing.li authored
      port bb31db3a (r33741)
    
      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.
    
    BUG=
    
    Review URL: https://codereview.chromium.org/1672643002
    
    Cr-Commit-Position: refs/heads/master@{#33759}
    25bfba93
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