[Webkit-unassigned] [Bug 208998] JavaScript identifier grammar supports unescaped astral symbols, but JSC doesn’t

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208998

--- Comment #3 from Yusuke Suzuki <ysuzuki at apple.com> ---
I think we should have a fallback path for surrogate pairs. Something like this.

if (!isIdentStart(code)) {
    // Check whether the code is leading surrogate.
    if (!isLeadSurrogate(code))
        goto fail;
    codeNext = getOneCharacter();
    if (!isTrailSurrogate(codeNext))
        goto fail;
    codePoint = codePointFromSurrogatePair(code, codeNext);
    if (!isIdentStart(codePoint))
        goto fail;
}

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