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LibJS: Replace source map HashMap with sorted Vector

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Bytecode source map entries are always added in order of increasing
bytecode offset, and lookups only happen during error handling (a cold
path). This makes a sorted vector with binary search a better fit than
a hash map.

This change reduces memory overhead and speeds up bytecode generation
by avoiding hash table operations during compilation. Lookups remain
fast via binary search, and since source_range_at() is only called
when generating stack traces, the O(log n) lookup is acceptable.
This commit is contained in:
Andreas Kling
2026-01-26 17:51:53 +01:00
committed by Andreas Kling
parent d488f9f12f
commit 81bee185e6
Notes: github-actions[bot] 2026-02-06 11:03:57 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/81bee185e6b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/7633
4 changed files with 23 additions and 11 deletions
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4
Libraries/LibJS/Bytecode/BasicBlock.h
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@@ -56,7 +56,7 @@ public:
BasicBlock const* finalizer() const { return m_finalizer; }
auto const& source_map() const { return m_source_map; }
void add_source_map_entry(u32 bytecode_offset, SourceRecord const& source_record) { m_source_map.set(bytecode_offset, source_record); }
void add_source_map_entry(u32 bytecode_offset, SourceRecord const& source_record) { m_source_map.append({ bytecode_offset, source_record }); }
[[nodiscard]] bool has_resolved_this() const { return m_has_resolved_this; }
void set_has_resolved_this() { m_has_resolved_this = true; }
@@ -75,7 +75,7 @@ private:
bool m_terminated { false };
bool m_has_resolved_this { false };
HashMap<size_t, SourceRecord> m_source_map;
Vector<SourceMapEntry> m_source_map;
size_t m_last_instruction_start_offset { 0 };
};