compiler/rustc_const_eval/src/lib.rs

   1 /*!
   2
   3 Rust MIR: a lowered representation of Rust.
   4
   5 */
   6
   7 #![feature(assert_matches)]
   8 #![feature(bool_to_option)]
   9 #![feature(box_patterns)]
  10 #![feature(control_flow_enum)]
  11 #![feature(crate_visibility_modifier)]
  12 #![feature(decl_macro)]
  13 #![feature(exact_size_is_empty)]
  14 #![feature(let_else)]
  15 #![feature(map_try_insert)]
  16 #![feature(min_specialization)]
  17 #![feature(slice_ptr_get)]
  18 #![feature(option_get_or_insert_default)]
  19 #![feature(never_type)]
  20 #![feature(trait_alias)]
  21 #![feature(trusted_len)]
  22 #![feature(trusted_step)]
  23 #![feature(try_blocks)]
  24 #![recursion_limit = "256"]
  25 #![allow(rustc::potential_query_instability)]
  26
  27 #[macro_use]
  28 extern crate tracing;
  29 #[macro_use]
  30 extern crate rustc_middle;
  31
  32 pub mod const_eval;
  33 pub mod interpret;
  34 pub mod transform;
  35 pub mod util;
  36
  37 use rustc_middle::ty::query::Providers;
  38 use rustc_middle::ty::ParamEnv;
  39
  40 pub fn provide(providers: &mut Providers) {
  41     const_eval::provide(providers);
  42     providers.eval_to_const_value_raw = const_eval::eval_to_const_value_raw_provider;
  43     providers.eval_to_allocation_raw = const_eval::eval_to_allocation_raw_provider;
  44     providers.const_caller_location = const_eval::const_caller_location;
  45     providers.try_destructure_const = |tcx, param_env_and_value| {
  46         let (param_env, value) = param_env_and_value.into_parts();
  47         const_eval::try_destructure_const(tcx, param_env, value).ok()
  48     };
  49     providers.const_to_valtree = |tcx, param_env_and_value| {
  50         let (param_env, raw) = param_env_and_value.into_parts();
  51         const_eval::const_to_valtree(tcx, param_env, raw)
  52     };
  53     providers.valtree_to_const_val = |tcx, (ty, valtree)| {
  54         const_eval::valtree_to_const_value(tcx, ParamEnv::empty().and(ty), valtree)
  55     };
  56     providers.deref_const = |tcx, param_env_and_value| {
  57         let (param_env, value) = param_env_and_value.into_parts();
  58         const_eval::deref_const(tcx, param_env, value)
  59     };
  60 }