scriptc

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Chris Tate 8bc8fc54ca Bound string reads of while loops by their counter tests

With while-loop versions, `while (pos < end && s.charCodeAt(pos) === 32)
pos++` took a version whose guard could never hold. The counter scan
records only typed-array accesses, so the string read fell back to the
statically ranged check. For a counter held in an int32 slot, that check
asks for a length above 2^31 - 2. The loop paid for the guard and ran its
checked copy.

The counter scan now records `s.charCodeAt(i)` and `s.charAt(i)` of a
string like typed-array reads. Their guard compares the counter's bound
with the string's length, as for a typed array. Corpus 7302 adds while
loops over counters below a string's length.

2026-10-22 17:47:26 -05:00

corpus

Bound string reads of while loops by their counter tests

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coverage-fixtures

Throw for every object on the right of an arrow instanceof, and give blocked bodies their this

2026-10-22 10:09:43 -05:00

deadstrip

…

diagnostics

Narrow filter results through written type predicates with checked conversions (#1819 )

2026-10-22 17:21:41 -05:00