Andreas Kling 19bf3f9479 LibJS: Use a forward cursor for source map lookup during compilation ...

The find_source_record lambda was doing a reverse linear scan through
the entire source map for every instruction emitted, resulting in
quadratic behavior. This was catastrophic for large scripts like
Octane/mandreel.js, where compile() dominated the profile at ~30s.

Since both source map entries and instruction iteration are ordered by
offset, replace the per-instruction scan with a forward cursor that
advances in lockstep with instruction emission.

2026-02-16 20:41:02 +01:00

83 KiB

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