compiler/rustc_monomorphize/src/lib.rs

   1 #![feature(array_windows)]
   2 #![recursion_limit = "256"]
   3 #![allow(rustc::potential_query_instability)]
   4 #![deny(rustc::untranslatable_diagnostic)]
   5 #![deny(rustc::diagnostic_outside_of_impl)]
   6
   7 #[macro_use]
   8 extern crate tracing;
   9 #[macro_use]
  10 extern crate rustc_middle;
  11
  12 use rustc_hir::lang_items::LangItem;
  13 use rustc_middle::traits;
  14 use rustc_middle::ty::adjustment::CustomCoerceUnsized;
  15 use rustc_middle::ty::query::{Providers, TyCtxtAt};
  16 use rustc_middle::ty::{self, Ty};
  17
  18 mod collector;
  19 mod errors;
  20 mod partitioning;
  21 mod polymorphize;
  22 mod util;
  23
  24 fn custom_coerce_unsize_info<'tcx>(
  25     tcx: TyCtxtAt<'tcx>,
  26     source_ty: Ty<'tcx>,
  27     target_ty: Ty<'tcx>,
  28 ) -> CustomCoerceUnsized {
  29     let trait_ref =
  30         ty::Binder::dummy(tcx.mk_trait_ref(LangItem::CoerceUnsized, [source_ty, target_ty]));
  31
  32     match tcx.codegen_select_candidate((ty::ParamEnv::reveal_all(), trait_ref)) {
  33         Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {
  34             impl_def_id,
  35             ..
  36         })) => tcx.coerce_unsized_info(impl_def_id).custom_kind.unwrap(),
  37         impl_source => {
  38             bug!("invalid `CoerceUnsized` impl_source: {:?}", impl_source);
  39         }
  40     }
  41 }
  42
  43 pub fn provide(providers: &mut Providers) {
  44     partitioning::provide(providers);
  45     polymorphize::provide(providers);
  46 }