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⚡ Bolt: Remove unnecessary string allocations in hot loops #128

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Merged
Tcode-Motion merged 1 commit into from
Sep 13, 2026
Merged

⚡ Bolt: Remove unnecessary string allocations in hot loops #128

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8 changes: 5 additions & 3 deletions runtime/vm/src/debugger.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,9 @@ impl VMDebugger {
return;
}

let op_str = format!("{:?}", op_code);
// Bolt performance optimization: Avoid unnecessary string allocation for op_code.
// `op_code` implements `Debug`, so we can format it directly into the final string
// instead of pre-allocating an intermediate String with `format!`.
let mut operands_str = String::new();

for op in operands {
Expand Down Expand Up @@ -93,8 +95,8 @@ impl VMDebugger {
}

println!(
"[{:04}] {:<15} {} | Stack: {:?}",
ip, op_str, operands_str, stack_dump
"[{:04}] {:<15?} {} | Stack: {:?}",
ip, op_code, operands_str, stack_dump
);
}
}
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