bjoernager/rust
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Auto merge of #97012 - oli-obk:🦀_intrinsics, r=davidtwco

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Add a query for checking whether a function is an intrinsic.

work towards #93145

This will reduce churn when we add more ways to declare intrinsics

r? `@scottmcm`
This commit is contained in:
bors 2022-05-17 09:39:26 +00:00
commit 735efc0c70
17 changed files with 52 additions and 45 deletions
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6
compiler/rustc_const_eval/src/const_eval/fn_queries.rs
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@ -4,7 +4,6 @@ use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{DefIdTree, TyCtxt};
use rustc_span::symbol::Symbol;
use rustc_target::spec::abi::Abi;
/// Whether the `def_id` is an unstable const fn and what feature gate is necessary to enable it
pub fn is_unstable_const_fn(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Symbol> {
@ -34,10 +33,7 @@ fn impl_constness(tcx: TyCtxt<'_>, def_id: DefId) -> hir::Constness {
hir::Node::ForeignItem(hir::ForeignItem { kind: hir::ForeignItemKind::Fn(..), .. }) => {
// Intrinsics use `rustc_const_{un,}stable` attributes to indicate constness. All other
// foreign items cannot be evaluated at compile-time.
let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
let is_const = if let Abi::RustIntrinsic | Abi::PlatformIntrinsic =
tcx.hir().get_foreign_abi(hir_id)
{
let is_const = if tcx.is_intrinsic(def_id) {
tcx.lookup_const_stability(def_id).is_some()
} else {
false