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Issue #1240 - Part 6b - Use ToIndex when constructing TypedArray with length argument. https://bugzilla.mozilla.org/show_bug.cgi?id=1317383 Part 2.

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Brian Smith 2023-07-19 16:36:58 -05:00 • committed by roytam1
commit e004b99054
5 changed files with 51 additions and 43 deletions
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29
js/src/jsnum.cpp
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@ -1768,6 +1768,35 @@ js::ToIntegerIndex(JSContext* cx, JS::HandleValue v, uint64_t* index)
return true;
}
// ES2017 draft 7.1.17 ToIndex
bool
js::ToIndex(JSContext* cx, JS::HandleValue v, uint64_t* index)
{
// Step 1.
if (v.isUndefined()) {
*index = 0;
return true;
}
// Step 2.a.
double integerIndex;
if (!ToInteger(cx, v, &integerIndex))
return false;
// Inlined version of ToLength.
// 1. Already an integer.
// 2. Step eliminates < 0, +0 == -0 with SameValueZero.
// 3/4. Limit to <= 2^53-1, so everything above should fail.
if (integerIndex < 0 || integerIndex >= DOUBLE_INTEGRAL_PRECISION_LIMIT) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_INDEX);
return false;
}
// Step 3.
*index = uint64_t(integerIndex);
return true;
}
template <typename CharT>
bool
js_strtod(ExclusiveContext* cx, const CharT* begin, const CharT* end, const CharT** dEnd,