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    • rossberg@chromium.org's avatar
      ES6 symbols: Implement Symbol intrinsic and basic functionality · 090d09d6
      rossberg@chromium.org authored
      - Add --harmony-symbols flag.
      - Add Symbol constructor; allow symbols as (unreplaced) return value from constructors.
      - Introduce %CreateSymbol and %_IsSymbol natives and respective instructions.
      - Extend 'typeof' code generation to handle symbols.
      - Extend CompareIC with a UNIQUE_NAMES state that (uniformly) handles internalized strings and symbols.
      - Property lookup delegates to SymbolDelegate object for symbols, which only carries the toString method.
      - Extend Object.prototype.toString to recognise symbols.
      
      Per the current draft spec, symbols are actually pseudo objects that are frozen with a null prototype and only one property (toString). For simplicity, we do not treat them as proper objects for now, although typeof will return "object". Only property access works as if they were (frozen) objects (via the internal delegate object).
      
      (Baseline CL: https://codereview.chromium.org/12223071/)
      
      R=mstarzinger@chromium.org
      BUG=v8:2158
      
      Review URL: https://codereview.chromium.org/12296026
      
      git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13786 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
      090d09d6
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