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    • rossberg@chromium.org's avatar
      Implement correct checking for inherited readonliness on assignment. · e4c472a7
      rossberg@chromium.org authored
      Removes 6 out of 8 of our remaining unintentional failures on test262.
      
      Also fixes treatment of inherited setters added after the fact.
      
      Specifically:
      
      - In the runtime, when looking for setter callbacks in the prototype chain,
        also look for read-only properties. If one is found, reject (exception in
        strict mode). If a proxy is found, invoke proper trap.
        Note: this folds in the CanPut function from the spec and avoids an extra
        lookup over the prototype chain.
      
      - In generated code for stores, insert a test for the maps from the prototype
        chain, but only up to the object where the property already exists (which
        may be the object itself).
        In Hydrogen, if the found property is read-only or not cacheable (e.g. a
        proxy), bail out; in a stub, generate an unconditional miss (to get an
        exception in strict mode).
      
      - Add test cases and adapt existing test expectations.
      
      R=mstarzinger@chromium.org
      BUG=
      TEST=
      
      Review URL: https://chromiumcodereview.appspot.com/10388047
      
      git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11694 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
      e4c472a7