[Webkit-unassigned] [Bug 147883] New: ES6: Implement computed accessors

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147883

            Bug ID: 147883
           Summary: ES6: Implement computed accessors
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ggaren at apple.com

Example test case:

=====

var x = 'y',
    valueSet,
    obj = {
      get [x] () { return 1 },
      set [x] (value) { valueSet = value }
    };
obj.y = 'foo';
return obj.y === 1 && valueSet === 'foo';

=====

This will probably require three new opcodes: op_put_getter_by_val, op_put_setter_by_val, op_put_getter_setter_by_val.

Like the equivalent by_id opcodes, these opcodes will mostly be a clone of get_by_val and put_by_val, with slightly different behavior for being getters and setters, and for not consulting the prototype chain.

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