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Auto merge of #120675 - oli-obk:intrinsics3.0, r=pnkfelix

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Add a scheme for moving away from `extern "rust-intrinsic"` entirely

All `rust-intrinsic`s can become free functions now, either with a fallback body, or with a dummy body and an attribute, requiring backends to actually implement the intrinsic.

This PR demonstrates the dummy-body scheme with the `vtable_size` intrinsic.

cc https://github.com/rust-lang/rust/issues/63585

follow-up to #120500

MCP at https://github.com/rust-lang/compiler-team/issues/720
This commit is contained in:
bors 2024-03-05 00:13:01 +00:00
commit 2eeff462b7
31 changed files with 207 additions and 51 deletions
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2
compiler/rustc_lint/src/builtin.rs
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@ -1231,7 +1231,7 @@ impl<'tcx> LateLintPass<'tcx> for MutableTransmutes {
}
fn def_id_is_transmute(cx: &LateContext<'_>, def_id: DefId) -> bool {
matches!(cx.tcx.intrinsic(def_id), Some(sym::transmute))
cx.tcx.is_intrinsic(def_id, sym::transmute)
}
}
}