Andreas Kling c1bc0cdfa9 LibJS: Allocate local variable indices in source order ...

The scope collector stored identifier_groups and variables in
HashMaps and then sorted them alphabetically before assigning local
register indices. The sorts existed only because HashMap iteration
order is non-deterministic; alphabetical was a stable choice for
comparing bytecode against the now-removed C++ port.

Switch both maps to indexmap::IndexMap so iteration follows the order
of first reference (= source order), and drop the alphabetical sorts.
Local indices now reflect declaration order, which matches what shows
up in bytecode dumps and is easier to read alongside the source.

Add a focused bytecode test using zebra/yak/aardvark to pin the new
allocation order; existing tests using let/var declarations have
their local indices renumbered to match.

2026-04-27 08:04:11 +02:00

2.5 KiB

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