1 // Copyright 2014 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.
14 macro_rules! try_opt {
23 #[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable)]
24 pub enum DepNode<D: Clone + Debug> {
25 // The `D` type is "how definitions are identified".
26 // During compilation, it is always `DefId`, but when serializing
27 // it is mapped to `DefPath`.
29 // Represents the `Krate` as a whole (the `hir::Krate` value) (as
30 // distinct from the krate module). This is basically a hash of
31 // the entire krate, so if you read from `Krate` (e.g., by calling
32 // `tcx.hir.krate()`), we will have to assume that any change
33 // means that you need to be recompiled. This is because the
34 // `Krate` value gives you access to all other items. To avoid
35 // this fate, do not call `tcx.hir.krate()`; instead, prefer
36 // wrappers like `tcx.visit_all_items_in_krate()`. If there is no
37 // suitable wrapper, you can use `tcx.dep_graph.ignore()` to gain
38 // access to the krate, but you must remember to add suitable
39 // edges yourself for the individual items that you read.
42 // Represents the HIR node with the given node-id
45 // Represents the body of a function or method. The def-id is that of the
49 // Represents the metadata for a given HIR node, typically found
50 // in an extern crate.
53 // Represents some artifact that we save to disk. Note that these
54 // do not have a def-id as part of their identifier.
55 WorkProduct(Arc<WorkProductId>),
57 // Represents different phases in the compiler.
73 CoherenceCheckTrait(D),
74 CoherenceCheckImpl(D),
75 CoherenceOverlapCheck(D),
76 CoherenceOverlapCheckSpecial(D),
77 CoherenceOverlapInherentCheck(D),
78 CoherenceOrphanCheck(D),
90 // Represents the MIR for a fn; also used as the task node for
91 // things read/modify that MIR.
106 // Nodes representing bits of computed IR in the tcx. Each shared
107 // table in the tcx (or elsewhere) maps to one of these
108 // nodes. Often we map multiple tables to the same node if there
109 // is no point in distinguishing them (e.g., both the type and
110 // predicates for an item wind up in `ItemSignature`).
113 TypeParamPredicates((D, D)),
115 AssociatedItemDefIds(D),
119 MonomorphicConstEval(D),
121 // The set of impls for a given trait. Ultimately, it would be
122 // nice to get more fine-grained here (e.g., to include a
123 // simplified type), but we can't do that until we restructure the
124 // HIR to distinguish the *header* of an impl from its body. This
125 // is because changes to the header may change the self-type of
126 // the impl and hence would require us to be more conservative
127 // than changes in the impl body.
130 // Nodes representing caches. To properly handle a true cache, we
131 // don't use a DepTrackingMap, but rather we push a task node.
132 // Otherwise the write into the map would be incorrectly
133 // attributed to the first task that happened to fill the cache,
134 // which would yield an overly conservative dep-graph.
138 // Trait selection cache is a little funny. Given a trait
139 // reference like `Foo: SomeTrait<Bar>`, there could be
140 // arbitrarily many def-ids to map on in there (e.g., `Foo`,
141 // `SomeTrait`, `Bar`). We could have a vector of them, but it
142 // requires heap-allocation, and trait sel in general can be a
143 // surprisingly hot path. So instead we pick two def-ids: the
144 // trait def-id, and the first def-id in the input types. If there
145 // is no def-id in the input types, then we use the trait def-id
146 // again. So for example:
148 // - `i32: Clone` -> `TraitSelect { trait_def_id: Clone, self_def_id: Clone }`
149 // - `u32: Clone` -> `TraitSelect { trait_def_id: Clone, self_def_id: Clone }`
150 // - `Clone: Clone` -> `TraitSelect { trait_def_id: Clone, self_def_id: Clone }`
151 // - `Vec<i32>: Clone` -> `TraitSelect { trait_def_id: Clone, self_def_id: Vec }`
152 // - `String: Clone` -> `TraitSelect { trait_def_id: Clone, self_def_id: String }`
153 // - `Foo: Trait<Bar>` -> `TraitSelect { trait_def_id: Trait, self_def_id: Foo }`
154 // - `Foo: Trait<i32>` -> `TraitSelect { trait_def_id: Trait, self_def_id: Foo }`
155 // - `(Foo, Bar): Trait` -> `TraitSelect { trait_def_id: Trait, self_def_id: Foo }`
156 // - `i32: Trait<Foo>` -> `TraitSelect { trait_def_id: Trait, self_def_id: Foo }`
158 // You can see that we map many trait refs to the same
159 // trait-select node. This is not a problem, it just means
160 // imprecision in our dep-graph tracking. The important thing is
161 // that for any given trait-ref, we always map to the **same**
162 // trait-select node.
163 TraitSelect { trait_def_id: D, input_def_id: D },
165 // For proj. cache, we just keep a list of all def-ids, since it is
167 ProjectionCache { def_ids: Vec<D> },
170 impl<D: Clone + Debug> DepNode<D> {
172 pub fn from_label_string(label: &str, data: D) -> Result<DepNode<D>, ()> {
174 ($($name:ident,)*) => {
176 $(stringify!($name) => Ok(DepNode::$name(data)),)*
182 if label == "Krate" {
184 return Ok(DepNode::Krate);
196 AssociatedItemDefIds,
205 pub fn map_def<E, OP>(&self, mut op: OP) -> Option<DepNode<E>>
206 where OP: FnMut(&D) -> Option<E>, E: Clone + Debug
208 use self::DepNode::*;
211 Krate => Some(Krate),
212 CollectLanguageItems => Some(CollectLanguageItems),
213 CheckStaticRecursion => Some(CheckStaticRecursion),
214 ResolveLifetimes => Some(ResolveLifetimes),
215 RegionResolveCrate => Some(RegionResolveCrate),
216 CheckLoops => Some(CheckLoops),
217 PluginRegistrar => Some(PluginRegistrar),
218 StabilityIndex => Some(StabilityIndex),
219 Coherence => Some(Coherence),
220 EffectCheck => Some(EffectCheck),
221 Liveness => Some(Liveness),
222 Resolve => Some(Resolve),
223 EntryPoint => Some(EntryPoint),
224 CheckEntryFn => Some(CheckEntryFn),
225 Variance => Some(Variance),
226 Dropck => Some(Dropck),
227 UnusedTraitCheck => Some(UnusedTraitCheck),
228 Privacy => Some(Privacy),
229 Reachability => Some(Reachability),
230 DeadCheck => Some(DeadCheck),
231 LateLintCheck => Some(LateLintCheck),
232 TransCrate => Some(TransCrate),
233 TransWriteMetadata => Some(TransWriteMetadata),
234 LinkBinary => Some(LinkBinary),
236 // work product names do not need to be mapped, because
237 // they are always absolute.
238 WorkProduct(ref id) => Some(WorkProduct(id.clone())),
240 Hir(ref d) => op(d).map(Hir),
241 HirBody(ref d) => op(d).map(HirBody),
242 MetaData(ref d) => op(d).map(MetaData),
243 CollectItem(ref d) => op(d).map(CollectItem),
244 CollectItemSig(ref d) => op(d).map(CollectItemSig),
245 CoherenceCheckTrait(ref d) => op(d).map(CoherenceCheckTrait),
246 CoherenceCheckImpl(ref d) => op(d).map(CoherenceCheckImpl),
247 CoherenceOverlapCheck(ref d) => op(d).map(CoherenceOverlapCheck),
248 CoherenceOverlapCheckSpecial(ref d) => op(d).map(CoherenceOverlapCheckSpecial),
249 CoherenceOverlapInherentCheck(ref d) => op(d).map(CoherenceOverlapInherentCheck),
250 CoherenceOrphanCheck(ref d) => op(d).map(CoherenceOrphanCheck),
251 WfCheck(ref d) => op(d).map(WfCheck),
252 TypeckItemType(ref d) => op(d).map(TypeckItemType),
253 DropckImpl(ref d) => op(d).map(DropckImpl),
254 CheckConst(ref d) => op(d).map(CheckConst),
255 IntrinsicCheck(ref d) => op(d).map(IntrinsicCheck),
256 MatchCheck(ref d) => op(d).map(MatchCheck),
257 Mir(ref d) => op(d).map(Mir),
258 BorrowCheck(ref d) => op(d).map(BorrowCheck),
259 RvalueCheck(ref d) => op(d).map(RvalueCheck),
260 StabilityCheck(ref d) => op(d).map(StabilityCheck),
261 TransCrateItem(ref d) => op(d).map(TransCrateItem),
262 TransInlinedItem(ref d) => op(d).map(TransInlinedItem),
263 AssociatedItems(ref d) => op(d).map(AssociatedItems),
264 ItemSignature(ref d) => op(d).map(ItemSignature),
265 TypeParamPredicates((ref item, ref param)) => {
266 Some(TypeParamPredicates((try_opt!(op(item)), try_opt!(op(param)))))
268 SizedConstraint(ref d) => op(d).map(SizedConstraint),
269 AssociatedItemDefIds(ref d) => op(d).map(AssociatedItemDefIds),
270 InherentImpls(ref d) => op(d).map(InherentImpls),
271 TypeckTables(ref d) => op(d).map(TypeckTables),
272 UsedTraitImports(ref d) => op(d).map(UsedTraitImports),
273 MonomorphicConstEval(ref d) => op(d).map(MonomorphicConstEval),
274 TraitImpls(ref d) => op(d).map(TraitImpls),
275 TraitItems(ref d) => op(d).map(TraitItems),
276 ReprHints(ref d) => op(d).map(ReprHints),
277 TraitSelect { ref trait_def_id, ref input_def_id } => {
278 op(trait_def_id).and_then(|trait_def_id| {
279 op(input_def_id).and_then(|input_def_id| {
280 Some(TraitSelect { trait_def_id: trait_def_id,
281 input_def_id: input_def_id })
285 ProjectionCache { ref def_ids } => {
286 let def_ids: Option<Vec<E>> = def_ids.iter().map(op).collect();
287 def_ids.map(|d| ProjectionCache { def_ids: d })
293 /// A "work product" corresponds to a `.o` (or other) file that we
294 /// save in between runs. These ids do not have a DefId but rather
295 /// some independent path or string that persists between runs without
296 /// the need to be mapped or unmapped. (This ensures we can serialize
297 /// them even in the absence of a tcx.)
298 #[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable)]
299 pub struct WorkProductId(pub String);