rust/compiler/rustc_const_eval/src/lib.rs

/*!

Rust MIR: a lowered representation of Rust.

*/

#![allow(internal_features)]
#![allow(rustc::diagnostic_outside_of_impl)]
#![feature(rustdoc_internals)]
#![doc(rust_logo)]
#![feature(assert_matches)]
#![feature(box_patterns)]
#![feature(decl_macro)]
#![feature(let_chains)]
#![feature(slice_ptr_get)]
#![feature(never_type)]
#![feature(trait_alias)]
#![feature(try_blocks)]
#![feature(yeet_expr)]
#![feature(if_let_guard)]

#[macro_use]
extern crate tracing;
#[macro_use]
extern crate rustc_middle;

pub mod const_eval;
mod errors;
pub mod interpret;
pub mod transform;
pub mod util;

pub use errors::ReportErrorExt;

use rustc_middle::{ty, util::Providers};

rustc_fluent_macro::fluent_messages! { "../messages.ftl" }

pub fn provide(providers: &mut Providers) {
    const_eval::provide(providers);
    providers.eval_to_const_value_raw = const_eval::eval_to_const_value_raw_provider;
    providers.eval_to_allocation_raw = const_eval::eval_to_allocation_raw_provider;
    providers.eval_static_initializer_raw = |tcx, def_id| {
        assert!(tcx.is_static(def_id.to_def_id()));
        let instance = ty::Instance::mono(tcx, def_id.to_def_id());
        let gid = rustc_middle::mir::interpret::GlobalId { instance, promoted: None };
        let param_env = ty::ParamEnv::reveal_all();
        Ok(tcx.eval_to_allocation_raw(param_env.and(gid))?.alloc_id)
    };
    providers.hooks.const_caller_location = util::caller_location::const_caller_location_provider;
    providers.eval_to_valtree = |tcx, param_env_and_value| {
        let (param_env, raw) = param_env_and_value.into_parts();
        const_eval::eval_to_valtree(tcx, param_env, raw)
    };
    providers.hooks.try_destructure_mir_constant_for_user_output =
        const_eval::try_destructure_mir_constant_for_user_output;
    providers.valtree_to_const_val = |tcx, (ty, valtree)| {
        const_eval::valtree_to_const_value(tcx, ty::ParamEnv::empty().and(ty), valtree)
    };
    providers.check_validity_requirement = |tcx, (init_kind, param_env_and_ty)| {
        util::check_validity_requirement(tcx, init_kind, param_env_and_ty)
    };
}