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https://github.com/LadybirdBrowser/ladybird
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eb9432fcb8
Carry full source positions through the Rust bytecode source map so stack traces and other bytecode-backed source lookups can use them directly. This keeps exception-heavy paths from reconstructing line and column information through SourceCode::range_from_offsets(), which can spend a lot of time building SourceCode's position cache on first use. We're trading some space for time here, but I believe it's worth it at this tag, as this saves ~250ms of main thread time while loading https://x.com/ on my Linux machine. :^) Reading the stored Position out of the source map directly also exposed two things masked by the old range_from_offsets() path: a latent off-by-one in Lexer::new_at_offset() (its consume() bumped line_column past the character at offset; only synthesize_binding_pattern() hit it), and a (1,1) fallback in range_from_offsets() that fired whenever the queried range reached EOF. Fix the lexer, then rebaseline both the bytecode dump tests (no more spurious "1:1") and the destructuring AST tests (binding-pattern identifiers now report their real columns).