Status: Untriaged
Owner: ----

New issue 4067 by [email protected]: trace-hydrogen doesn't trace extended classes
https://code.google.com/p/v8/issues/detail?id=4067

Version: 4.4.44
OS: Linux
Architecture: x64

Using the following JS code snippet:


'use strict';

class A {
  constructor() { }
}

class B extends A {
  constructor() {
    super();
  }
}

for (var i = 0; i < 1e7; i++)
  new B();


Then run with:

./out/x64.release/d8 --trace_hydrogen --trace_phase=Z --trace_deopt \
  --code_comments --hydrogen_track_positions --redirect_code_traces \
  --redirect_code_traces_to=code.asm --print_opt_code script.js

I would expect there to be a hydrogen.cfg and code.asm file, but there are none. It seems that code traces to classes that use "extends" don't output any information.

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