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rustc_intrinsic: support functions without body; they are implicitly marked as must-be-overridden

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This commit is contained in:
Ralf Jung 2025-01-04 11:41:51 +01:00
parent be65012aa3
commit 3cd3649c6c
19 changed files with 118 additions and 68 deletions
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14
compiler/rustc_mir_build/src/builder/mod.rs
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@ -1005,11 +1005,25 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
if let Some(source_scope) = scope {
self.source_scope = source_scope;
}
if self.tcx.intrinsic(self.def_id).is_some_and(|i| i.must_be_overridden) {
let source_info = self.source_info(rustc_span::DUMMY_SP);
self.cfg.terminate(block, source_info, TerminatorKind::Unreachable);
self.cfg.start_new_block().unit()
} else {
// Ensure we don't silently codegen functions with fake bodies.
match self.tcx.hir_node(self.hir_id) {
hir::Node::Item(hir::Item {
kind: hir::ItemKind::Fn { has_body: false, .. },
..
}) => {
self.tcx.dcx().span_delayed_bug(
expr_span,
format!("fn item without body has reached MIR building: {:?}", self.def_id),
);
}
_ => {}
}
self.expr_into_dest(Place::return_place(), block, expr_id)
}
}