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Rollup merge of #71285 - ljedrz:mir_inline_span_for_optimized_mir, r=ecstatic-morse

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MIR: use HirId instead of NodeId to avoid cycles while inlining

I wanted to see if I could limit the number of uses of `NodeId` when `HirId` is available and I saw that some of the MIR `Inliner` code could use `Span` instead of `NodeId`, not unlike in https://github.com/rust-lang/rust/pull/71197.

~If I'm understanding the reason for not calling `optimized_mir` in incremental builds here correctly, this change could also allow us to do so.~

This change could affect performance, so if this approach makes sense, a perf run is probably a good idea.
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Dylan DPC 2020-04-21 00:30:57 +02:00 committed by GitHub
commit 42b533d7ba
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1 changed files with 5 additions and 7 deletions
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12
src/librustc_mir/transform/inline.rs
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@ -94,17 +94,15 @@ impl Inliner<'tcx> {
continue;
}
let self_node_id = self.tcx.hir().as_local_node_id(self.source.def_id()).unwrap();
let callee_node_id = self.tcx.hir().as_local_node_id(callsite.callee);
let callee_hir_id = self.tcx.hir().as_local_hir_id(callsite.callee);
let callee_body = if let Some(callee_node_id) = callee_node_id {
let callee_body = if let Some(callee_hir_id) = callee_hir_id {
let self_hir_id = self.tcx.hir().as_local_hir_id(self.source.def_id()).unwrap();
// Avoid a cycle here by only using `optimized_mir` only if we have
// a lower node id than the callee. This ensures that the callee will
// a lower `HirId` than the callee. This ensures that the callee will
// not inline us. This trick only works without incremental compilation.
// So don't do it if that is enabled.
if !self.tcx.dep_graph.is_fully_enabled()
&& self_node_id.as_u32() < callee_node_id.as_u32()
{
if !self.tcx.dep_graph.is_fully_enabled() && self_hir_id < callee_hir_id {
self.tcx.optimized_mir(callsite.callee)
} else {
continue;