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Only collect mono items from reachable blocks

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This commit is contained in:
Ben Kimock 2024-03-31 12:31:48 -04:00
parent e78913baef
commit 339f4be046
4 changed files with 110 additions and 67 deletions
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9
compiler/rustc_codegen_ssa/src/mir/mod.rs
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@ -257,20 +257,19 @@ pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
// Apply debuginfo to the newly allocated locals.
fx.debug_introduce_locals(&mut start_bx);
let reachable_blocks = mir.reachable_blocks_in_mono(cx.tcx(), instance);
// 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);
let reachable_blocks = traversal::mono_reachable_as_bitset(mir, cx.tcx(), instance);
// Codegen the body of each block using reverse postorder
for (bb, _) in traversal::reverse_postorder(mir) {
if reachable_blocks.contains(bb) {
fx.codegen_block(bb);
} else {
// This may have references to things we didn't monomorphize, so we
// don't actually codegen the body. We still create the block so
// terminators in other blocks can reference it without worry.
// We want to skip this block, because it's not reachable. But we still create
// the block so terminators in other blocks can reference it.
fx.codegen_block_as_unreachable(bb);
}
}