Andreas Kling 1d145eec72 LibJS: Fix phantom source map entries from assembly-time optimizations ...

The compile() function was adding source map entries for all
instructions in a block upfront, before processing assembly-time
optimizations (Jump-to-next-block elision, Jump-to-Return/End inlining,
JumpIf-to-JumpTrue/JumpFalse conversion). When a Jump was skipped,
its phantom source map entry remained at the offset where the next
block's first instruction would be placed, causing binary_search to
find the wrong source location for error messages.

Fix by building source map entries inline with instruction emission,
ensuring only actually-emitted instructions get entries. For blocks
with duplicate source map entries at the same offset (from rewind in
fuse_compare_and_jump), the last entry is used.

2026-02-15 23:21:46 +01:00

83 KiB

Raw Blame History

View Raw