Andreas Kling 4b47245e99 LibJS: Cache ASCII-to-UTF-16 source conversion for Rust compilation ...

The Rust FFI requires UTF-16 source data, so ASCII-stored source code
must be widened to UTF-16. Previously, this conversion was done into a
temporary buffer on every call to compile_function, meaning the entire
source file was converted for each lazily-compiled function. For large
modules with many functions, this caused heavy spinning.

Move the conversion into SourceCode::utf16_data() which lazily converts
and caches the result once per source file. Subsequent compilations of
functions from the same file reuse the cached data.

2026-02-25 00:00:52 +01:00

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