[Webkit-unassigned] [Bug 143424] New: [ES6] DFG and FTL should be aware of that StringConstructor behavior for symbols becomes different from ToString

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143424

            Bug ID: 143424
           Summary: [ES6] DFG and FTL should be aware of that
                    StringConstructor behavior for symbols becomes
                    different from ToString
    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: utatane.tea at gmail.com

In ES6, StringConstructor behavior becomes different from ToString abstract operations in the spec. (and JSValue::toString).

ToString(symbol) throws a type error.
String(symbol) produces  SymbolDescriptiveString(value).

So, in DFG and FTL phase, they should not inline String constructor to ToString.
Now, in the template literals patch, ToString DFG operation is planned to be used for it.
And current ToString behavior is aligned to the spec (and JSValue::toString). I think keeping it is better.
So intead of changing ToString behavior, I think adding StringConstructor operation into DFG and FTL is nice.

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