/
keys.rs
193 lines (166 loc) · 4.52 KB
/
keys.rs
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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Defines the set of legal keys that can be used in queries.
use hir::def_id::{CrateNum, DefId, LOCAL_CRATE, DefIndex};
use traits::query::{CanonicalProjectionGoal, CanonicalTyGoal};
use ty::{self, Ty, TyCtxt};
use ty::subst::Substs;
use ty::fast_reject::SimplifiedType;
use mir;
use std::fmt::Debug;
use std::hash::Hash;
use syntax_pos::{Span, DUMMY_SP};
use syntax_pos::symbol::InternedString;
/// The `Key` trait controls what types can legally be used as the key
/// for a query.
pub trait Key: Clone + Hash + Eq + Debug {
/// Given an instance of this key, what crate is it referring to?
/// This is used to find the provider.
fn map_crate(&self) -> CrateNum;
/// In the event that a cycle occurs, if no explicit span has been
/// given for a query with key `self`, what span should we use?
fn default_span(&self, tcx: TyCtxt) -> Span;
}
impl<'tcx> Key for ty::InstanceDef<'tcx> {
fn map_crate(&self) -> CrateNum {
LOCAL_CRATE
}
fn default_span(&self, tcx: TyCtxt) -> Span {
tcx.def_span(self.def_id())
}
}
impl<'tcx> Key for ty::Instance<'tcx> {
fn map_crate(&self) -> CrateNum {
LOCAL_CRATE
}
fn default_span(&self, tcx: TyCtxt) -> Span {
tcx.def_span(self.def_id())
}
}
impl<'tcx> Key for mir::interpret::GlobalId<'tcx> {
fn map_crate(&self) -> CrateNum {
self.instance.map_crate()
}
fn default_span(&self, tcx: TyCtxt) -> Span {
self.instance.default_span(tcx)
}
}
impl Key for CrateNum {
fn map_crate(&self) -> CrateNum {
*self
}
fn default_span(&self, _: TyCtxt) -> Span {
DUMMY_SP
}
}
impl Key for DefIndex {
fn map_crate(&self) -> CrateNum {
LOCAL_CRATE
}
fn default_span(&self, _tcx: TyCtxt) -> Span {
DUMMY_SP
}
}
impl Key for DefId {
fn map_crate(&self) -> CrateNum {
self.krate
}
fn default_span(&self, tcx: TyCtxt) -> Span {
tcx.def_span(*self)
}
}
impl Key for (DefId, DefId) {
fn map_crate(&self) -> CrateNum {
self.0.krate
}
fn default_span(&self, tcx: TyCtxt) -> Span {
self.1.default_span(tcx)
}
}
impl Key for (CrateNum, DefId) {
fn map_crate(&self) -> CrateNum {
self.0
}
fn default_span(&self, tcx: TyCtxt) -> Span {
self.1.default_span(tcx)
}
}
impl Key for (DefId, SimplifiedType) {
fn map_crate(&self) -> CrateNum {
self.0.krate
}
fn default_span(&self, tcx: TyCtxt) -> Span {
self.0.default_span(tcx)
}
}
impl<'tcx> Key for (DefId, &'tcx Substs<'tcx>) {
fn map_crate(&self) -> CrateNum {
self.0.krate
}
fn default_span(&self, tcx: TyCtxt) -> Span {
self.0.default_span(tcx)
}
}
impl<'tcx> Key for (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>) {
fn map_crate(&self) -> CrateNum {
self.1.def_id().krate
}
fn default_span(&self, tcx: TyCtxt) -> Span {
tcx.def_span(self.1.def_id())
}
}
impl<'tcx> Key for ty::PolyTraitRef<'tcx>{
fn map_crate(&self) -> CrateNum {
self.def_id().krate
}
fn default_span(&self, tcx: TyCtxt) -> Span {
tcx.def_span(self.def_id())
}
}
impl<'tcx> Key for Ty<'tcx> {
fn map_crate(&self) -> CrateNum {
LOCAL_CRATE
}
fn default_span(&self, _: TyCtxt) -> Span {
DUMMY_SP
}
}
impl<'tcx, T: Key> Key for ty::ParamEnvAnd<'tcx, T> {
fn map_crate(&self) -> CrateNum {
self.value.map_crate()
}
fn default_span(&self, tcx: TyCtxt) -> Span {
self.value.default_span(tcx)
}
}
impl Key for InternedString {
fn map_crate(&self) -> CrateNum {
LOCAL_CRATE
}
fn default_span(&self, _tcx: TyCtxt) -> Span {
DUMMY_SP
}
}
impl<'tcx> Key for CanonicalProjectionGoal<'tcx> {
fn map_crate(&self) -> CrateNum {
LOCAL_CRATE
}
fn default_span(&self, _tcx: TyCtxt) -> Span {
DUMMY_SP
}
}
impl<'tcx> Key for CanonicalTyGoal<'tcx> {
fn map_crate(&self) -> CrateNum {
LOCAL_CRATE
}
fn default_span(&self, _tcx: TyCtxt) -> Span {
DUMMY_SP
}
}