1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
14 use rustc::mir::transform::{MirPassIndex, MirSuite, MirSource,
15 MIR_CONST, MIR_VALIDATED, MIR_OPTIMIZED};
16 use rustc::ty::{self, TyCtxt};
17 use rustc::ty::maps::Providers;
18 use rustc::ty::steal::Steal;
20 use rustc::hir::intravisit::{self, Visitor, NestedVisitorMap};
21 use rustc::util::nodemap::DefIdSet;
24 use syntax_pos::{DUMMY_SP, Span};
27 pub mod add_validation;
28 pub mod clean_end_regions;
29 pub mod simplify_branches;
31 pub mod erase_regions;
32 pub mod no_landing_pads;
36 pub mod elaborate_drops;
37 pub mod add_call_guards;
38 pub mod promote_consts;
39 pub mod qualify_consts;
48 pub(crate) fn provide(providers: &mut Providers) {
49 self::qualify_consts::provide(providers);
50 *providers = Providers {
60 fn is_mir_available<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> bool {
61 tcx.mir_keys(def_id.krate).contains(&def_id)
64 /// Finds the full set of def-ids within the current crate that have
65 /// MIR associated with them.
66 fn mir_keys<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, krate: CrateNum)
68 assert_eq!(krate, LOCAL_CRATE);
70 let mut set = DefIdSet();
72 // All body-owners have MIR associated with them.
73 set.extend(tcx.body_owners());
75 // Additionally, tuple struct/variant constructors have MIR, but
76 // they don't have a BodyId, so we need to build them separately.
77 struct GatherCtors<'a, 'tcx: 'a> {
78 tcx: TyCtxt<'a, 'tcx, 'tcx>,
79 set: &'a mut DefIdSet,
81 impl<'a, 'tcx> Visitor<'tcx> for GatherCtors<'a, 'tcx> {
82 fn visit_variant_data(&mut self,
83 v: &'tcx hir::VariantData,
85 _: &'tcx hir::Generics,
88 if let hir::VariantData::Tuple(_, node_id) = *v {
89 self.set.insert(self.tcx.hir.local_def_id(node_id));
91 intravisit::walk_struct_def(self, v)
93 fn nested_visit_map<'b>(&'b mut self) -> NestedVisitorMap<'b, 'tcx> {
94 NestedVisitorMap::None
97 tcx.hir.krate().visit_all_item_likes(&mut GatherCtors {
100 }.as_deep_visitor());
105 fn mir_const<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> &'tcx Steal<Mir<'tcx>> {
106 let mut mir = build::mir_build(tcx, def_id);
107 let source = MirSource::from_local_def_id(tcx, def_id);
108 transform::run_suite(tcx, source, MIR_CONST, &mut mir);
109 tcx.alloc_steal_mir(mir)
112 fn mir_validated<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> &'tcx Steal<Mir<'tcx>> {
113 let source = MirSource::from_local_def_id(tcx, def_id);
114 if let MirSource::Const(_) = source {
115 // Ensure that we compute the `mir_const_qualif` for constants at
116 // this point, before we steal the mir-const result. We don't
117 // directly need the result or `mir_const_qualif`, so we can just force it.
118 ty::queries::mir_const_qualif::force(tcx, DUMMY_SP, def_id);
121 let mut mir = tcx.mir_const(def_id).steal();
122 transform::run_suite(tcx, source, MIR_VALIDATED, &mut mir);
123 tcx.alloc_steal_mir(mir)
126 fn optimized_mir<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> &'tcx Mir<'tcx> {
127 // Borrowck uses `mir_validated`, so we have to force it to
128 // execute before we can steal.
129 ty::queries::borrowck::force(tcx, DUMMY_SP, def_id);
131 let mut mir = tcx.mir_validated(def_id).steal();
132 let source = MirSource::from_local_def_id(tcx, def_id);
133 transform::run_suite(tcx, source, MIR_OPTIMIZED, &mut mir);
137 fn run_suite<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
142 let passes = tcx.mir_passes.passes(suite);
144 for (pass, index) in passes.iter().zip(0..) {
145 let pass_num = MirPassIndex(index);
147 for hook in tcx.mir_passes.hooks() {
148 hook.on_mir_pass(tcx, suite, pass_num, &pass.name(), source, &mir, false);
151 pass.run_pass(tcx, source, mir);
153 for hook in tcx.mir_passes.hooks() {
154 hook.on_mir_pass(tcx, suite, pass_num, &pass.name(), source, &mir, true);