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Prevent the start_bx basic block in codegen from having two Builders at the same time #108739

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merged 2 commits into from
Mar 11, 2023
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Prevent the start_bx basic block in codegen from having two Builders at the same time #108739

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Prevent the `start_bx` basic block in codegen from having two `Builde…
823984418 Mar 4, 2023
871b4fe
Add a comment about drop(start_bx)
823984418 Mar 8, 2023
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4 changes: 4 additions & 0 deletions compiler/rustc_codegen_ssa/src/mir/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -258,6 +258,10 @@ pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
// Apply debuginfo to the newly allocated locals.
fx.debug_introduce_locals(&mut start_bx);

// The builders will be created separately for each basic block at `codegen_block`.
// So drop the builder of `start_llbb` to avoid having two at the same time.
drop(start_bx);

// Codegen the body of each block using reverse postorder
for (bb, _) in traversal::reverse_postorder(&mir) {
fx.codegen_block(bb);
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