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add intrinsic to access vtable size and align

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This commit is contained in:
Ralf Jung 2022-07-18 09:48:20 -04:00
parent b5a32d01f4
commit 8affef2ccb
6 changed files with 66 additions and 2 deletions
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4
compiler/rustc_typeck/src/check/intrinsic.rs
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@ -400,6 +400,10 @@ pub fn check_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
sym::const_eval_select => (4, vec![param(0), param(1), param(2)], param(3)),
sym::vtable_size | sym::vtable_align => {
(0, vec![tcx.mk_imm_ptr(tcx.mk_unit())], tcx.types.usize)
}
other => {
tcx.sess.emit_err(UnrecognizedIntrinsicFunction { span: it.span, name: other });
return;