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⚡ Bolt: Pre-allocate collections in VM executor - #281

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bolt-vm-preallocate-14489445380383539937
Oct 10, 2026
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github-actions[bot] merged 1 commit into
mainfrom
bolt-vm-preallocate-14489445380383539937

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@Tcode-Motion

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💡 What: Replaced Vec::new() and indexmap::IndexMap::new() with Vec::with_capacity() and indexmap::IndexMap::with_capacity() in Opcode::Call, Opcode::MakeList, and Opcode::MakeMap using the known size from the instruction operand, bounded by the current stack length to prevent OOM panics on malformed bytecode.
🎯 Why: To avoid unnecessary memory reallocations and re-hashing when constructing dynamically sized collections (lists, maps, arguments) during the hot VM execution loop.
📊 Impact: Reduces heap reallocation overhead linearly proportional to the size of lists, maps, and argument counts created in TechScript runtime.
🔬 Measurement: Can be verified via CPU profiling during execution of scripts that make heavy use of function calls or instantiate large lists and maps.


PR created automatically by Jules for task 14489445380383539937 started by @Tcode-Motion

Co-authored-by: Tcode-Motion <188012755+Tcode-Motion@users.noreply.github.com>
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github-actions Bot marked this pull request as ready for review October 10, 2026 05:17
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github-actions Bot merged commit ebd8fde into main Oct 10, 2026
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