src/librustc/hir/map/def_collector.rs

   1 // Copyright 2016 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.
   4 //
   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.
  10
  11 use super::*;
  12
  13 use hir;
  14 use hir::intravisit;
  15 use hir::def_id::{CRATE_DEF_INDEX, DefId, DefIndex};
  16
  17 use middle::cstore::InlinedItem;
  18
  19 use syntax::ast::*;
  20 use syntax::ext::hygiene::Mark;
  21 use syntax::visit;
  22 use syntax::parse::token::{self, keywords};
  23
  24 /// Creates def ids for nodes in the HIR.
  25 pub struct DefCollector<'a> {
  26     // If we are walking HIR (c.f., AST), we need to keep a reference to the
  27     // crate.
  28     hir_crate: Option<&'a hir::Crate>,
  29     definitions: &'a mut Definitions,
  30     parent_def: Option<DefIndex>,
  31     pub visit_macro_invoc: Option<&'a mut FnMut(MacroInvocationData)>,
  32 }
  33
  34 pub struct MacroInvocationData {
  35     pub mark: Mark,
  36     pub def_index: DefIndex,
  37     pub const_integer: bool,
  38 }
  39
  40 impl<'a> DefCollector<'a> {
  41     pub fn new(definitions: &'a mut Definitions) -> Self {
  42         DefCollector {
  43             hir_crate: None,
  44             definitions: definitions,
  45             parent_def: None,
  46             visit_macro_invoc: None,
  47         }
  48     }
  49
  50     pub fn extend(parent_node: NodeId,
  51                   parent_def_path: DefPath,
  52                   parent_def_id: DefId,
  53                   definitions: &'a mut Definitions)
  54                   -> Self {
  55         let mut collector = DefCollector::new(definitions);
  56
  57         assert_eq!(parent_def_path.krate, parent_def_id.krate);
  58         let root_path = Box::new(InlinedRootPath {
  59             data: parent_def_path.data,
  60             def_id: parent_def_id,
  61         });
  62
  63         let def = collector.create_def(parent_node, DefPathData::InlinedRoot(root_path));
  64         collector.parent_def = Some(def);
  65
  66         collector
  67     }
  68
  69     pub fn collect_root(&mut self) {
  70         let root = self.create_def_with_parent(None, CRATE_NODE_ID, DefPathData::CrateRoot);
  71         assert_eq!(root, CRATE_DEF_INDEX);
  72         self.parent_def = Some(root);
  73
  74         self.create_def_with_parent(Some(CRATE_DEF_INDEX), DUMMY_NODE_ID, DefPathData::Misc);
  75     }
  76
  77     pub fn walk_item(&mut self, ii: &'a InlinedItem, krate: &'a hir::Crate) {
  78         self.hir_crate = Some(krate);
  79         ii.visit(self);
  80     }
  81
  82     fn create_def(&mut self, node_id: NodeId, data: DefPathData) -> DefIndex {
  83         let parent_def = self.parent_def;
  84         debug!("create_def(node_id={:?}, data={:?}, parent_def={:?})", node_id, data, parent_def);
  85         self.definitions.create_def_with_parent(parent_def, node_id, data)
  86     }
  87
  88     fn create_def_with_parent(&mut self,
  89                               parent: Option<DefIndex>,
  90                               node_id: NodeId,
  91                               data: DefPathData)
  92                               -> DefIndex {
  93         self.definitions.create_def_with_parent(parent, node_id, data)
  94     }
  95
  96     pub fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: DefIndex, f: F) {
  97         let parent = self.parent_def;
  98         self.parent_def = Some(parent_def);
  99         f(self);
 100         self.parent_def = parent;
 101     }
 102
 103     pub fn visit_ast_const_integer(&mut self, expr: &Expr) {
 104         match expr.node {
 105             // Find the node which will be used after lowering.
 106             ExprKind::Paren(ref inner) => return self.visit_ast_const_integer(inner),
 107             ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id, true),
 108             // FIXME(eddyb) Closures should have separate
 109             // function definition IDs and expression IDs.
 110             ExprKind::Closure(..) => return,
 111             _ => {}
 112         }
 113
 114         self.create_def(expr.id, DefPathData::Initializer);
 115     }
 116
 117     fn visit_hir_const_integer(&mut self, expr: &hir::Expr) {
 118         // FIXME(eddyb) Closures should have separate
 119         // function definition IDs and expression IDs.
 120         if let hir::ExprClosure(..) = expr.node {
 121             return;
 122         }
 123
 124         self.create_def(expr.id, DefPathData::Initializer);
 125     }
 126
 127     fn visit_macro_invoc(&mut self, id: NodeId, const_integer: bool) {
 128         if let Some(ref mut visit) = self.visit_macro_invoc {
 129             visit(MacroInvocationData {
 130                 mark: Mark::from_placeholder_id(id),
 131                 const_integer: const_integer,
 132                 def_index: self.parent_def.unwrap(),
 133             })
 134         }
 135     }
 136 }
 137
 138 impl<'a> visit::Visitor for DefCollector<'a> {
 139     fn visit_item(&mut self, i: &Item) {
 140         debug!("visit_item: {:?}", i);
 141
 142         // Pick the def data. This need not be unique, but the more
 143         // information we encapsulate into
 144         let def_data = match i.node {
 145             ItemKind::DefaultImpl(..) | ItemKind::Impl(..) =>
 146                 DefPathData::Impl,
 147             ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) | ItemKind::Trait(..) |
 148             ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) | ItemKind::Ty(..) =>
 149                 DefPathData::TypeNs(i.ident.name.as_str()),
 150             ItemKind::Mod(..) if i.ident == keywords::Invalid.ident() => {
 151                 return visit::walk_item(self, i);
 152             }
 153             ItemKind::Mod(..) => DefPathData::Module(i.ident.name.as_str()),
 154             ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) =>
 155                 DefPathData::ValueNs(i.ident.name.as_str()),
 156             ItemKind::Mac(..) if i.id == DUMMY_NODE_ID => return, // Scope placeholder
 157             ItemKind::Mac(..) => return self.visit_macro_invoc(i.id, false),
 158             ItemKind::Use(..) => DefPathData::Misc,
 159         };
 160         let def = self.create_def(i.id, def_data);
 161
 162         self.with_parent(def, |this| {
 163             match i.node {
 164                 ItemKind::Enum(ref enum_definition, _) => {
 165                     for v in &enum_definition.variants {
 166                         let variant_def_index =
 167                             this.create_def(v.node.data.id(),
 168                                             DefPathData::EnumVariant(v.node.name.name.as_str()));
 169                         this.with_parent(variant_def_index, |this| {
 170                             for (index, field) in v.node.data.fields().iter().enumerate() {
 171                                 let name = field.ident.map(|ident| ident.name)
 172                                     .unwrap_or_else(|| token::intern(&index.to_string()));
 173                                 this.create_def(field.id, DefPathData::Field(name.as_str()));
 174                             }
 175
 176                             if let Some(ref expr) = v.node.disr_expr {
 177                                 this.visit_ast_const_integer(expr);
 178                             }
 179                         });
 180                     }
 181                 }
 182                 ItemKind::Struct(ref struct_def, _) | ItemKind::Union(ref struct_def, _) => {
 183                     // If this is a tuple-like struct, register the constructor.
 184                     if !struct_def.is_struct() {
 185                         this.create_def(struct_def.id(),
 186                                         DefPathData::StructCtor);
 187                     }
 188
 189                     for (index, field) in struct_def.fields().iter().enumerate() {
 190                         let name = field.ident.map(|ident| ident.name.as_str())
 191                             .unwrap_or(token::intern(&index.to_string()).as_str());
 192                         this.create_def(field.id, DefPathData::Field(name));
 193                     }
 194                 }
 195                 _ => {}
 196             }
 197             visit::walk_item(this, i);
 198         });
 199     }
 200
 201     fn visit_foreign_item(&mut self, foreign_item: &ForeignItem) {
 202         let def = self.create_def(foreign_item.id,
 203                                   DefPathData::ValueNs(foreign_item.ident.name.as_str()));
 204
 205         self.with_parent(def, |this| {
 206             visit::walk_foreign_item(this, foreign_item);
 207         });
 208     }
 209
 210     fn visit_generics(&mut self, generics: &Generics) {
 211         for ty_param in generics.ty_params.iter() {
 212             self.create_def(ty_param.id, DefPathData::TypeParam(ty_param.ident.name.as_str()));
 213         }
 214
 215         visit::walk_generics(self, generics);
 216     }
 217
 218     fn visit_trait_item(&mut self, ti: &TraitItem) {
 219         let def_data = match ti.node {
 220             TraitItemKind::Method(..) | TraitItemKind::Const(..) =>
 221                 DefPathData::ValueNs(ti.ident.name.as_str()),
 222             TraitItemKind::Type(..) => DefPathData::TypeNs(ti.ident.name.as_str()),
 223             TraitItemKind::Macro(..) => return self.visit_macro_invoc(ti.id, false),
 224         };
 225
 226         let def = self.create_def(ti.id, def_data);
 227         self.with_parent(def, |this| {
 228             if let TraitItemKind::Const(_, Some(ref expr)) = ti.node {
 229                 this.create_def(expr.id, DefPathData::Initializer);
 230             }
 231
 232             visit::walk_trait_item(this, ti);
 233         });
 234     }
 235
 236     fn visit_impl_item(&mut self, ii: &ImplItem) {
 237         let def_data = match ii.node {
 238             ImplItemKind::Method(..) | ImplItemKind::Const(..) =>
 239                 DefPathData::ValueNs(ii.ident.name.as_str()),
 240             ImplItemKind::Type(..) => DefPathData::TypeNs(ii.ident.name.as_str()),
 241             ImplItemKind::Macro(..) => return self.visit_macro_invoc(ii.id, false),
 242         };
 243
 244         let def = self.create_def(ii.id, def_data);
 245         self.with_parent(def, |this| {
 246             if let ImplItemKind::Const(_, ref expr) = ii.node {
 247                 this.create_def(expr.id, DefPathData::Initializer);
 248             }
 249
 250             visit::walk_impl_item(this, ii);
 251         });
 252     }
 253
 254     fn visit_pat(&mut self, pat: &Pat) {
 255         let parent_def = self.parent_def;
 256
 257         match pat.node {
 258             PatKind::Mac(..) => return self.visit_macro_invoc(pat.id, false),
 259             PatKind::Ident(_, id, _) => {
 260                 let def = self.create_def(pat.id, DefPathData::Binding(id.node.name.as_str()));
 261                 self.parent_def = Some(def);
 262             }
 263             _ => {}
 264         }
 265
 266         visit::walk_pat(self, pat);
 267         self.parent_def = parent_def;
 268     }
 269
 270     fn visit_expr(&mut self, expr: &Expr) {
 271         let parent_def = self.parent_def;
 272
 273         match expr.node {
 274             ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id, false),
 275             ExprKind::Repeat(_, ref count) => self.visit_ast_const_integer(count),
 276             ExprKind::Closure(..) => {
 277                 let def = self.create_def(expr.id, DefPathData::ClosureExpr);
 278                 self.parent_def = Some(def);
 279             }
 280             _ => {}
 281         }
 282
 283         visit::walk_expr(self, expr);
 284         self.parent_def = parent_def;
 285     }
 286
 287     fn visit_ty(&mut self, ty: &Ty) {
 288         match ty.node {
 289             TyKind::Mac(..) => return self.visit_macro_invoc(ty.id, false),
 290             TyKind::Array(_, ref length) => self.visit_ast_const_integer(length),
 291             TyKind::ImplTrait(..) => {
 292                 self.create_def(ty.id, DefPathData::ImplTrait);
 293             }
 294             _ => {}
 295         }
 296         visit::walk_ty(self, ty);
 297     }
 298
 299     fn visit_lifetime_def(&mut self, def: &LifetimeDef) {
 300         self.create_def(def.lifetime.id, DefPathData::LifetimeDef(def.lifetime.name.as_str()));
 301     }
 302
 303     fn visit_macro_def(&mut self, macro_def: &MacroDef) {
 304         self.create_def(macro_def.id, DefPathData::MacroDef(macro_def.ident.name.as_str()));
 305     }
 306
 307     fn visit_stmt(&mut self, stmt: &Stmt) {
 308         match stmt.node {
 309             StmtKind::Mac(..) => self.visit_macro_invoc(stmt.id, false),
 310             _ => visit::walk_stmt(self, stmt),
 311         }
 312     }
 313 }
 314
 315 // We walk the HIR rather than the AST when reading items from metadata.
 316 impl<'ast> intravisit::Visitor<'ast> for DefCollector<'ast> {
 317     fn visit_item(&mut self, i: &'ast hir::Item) {
 318         debug!("visit_item: {:?}", i);
 319
 320         // Pick the def data. This need not be unique, but the more
 321         // information we encapsulate into
 322         let def_data = match i.node {
 323             hir::ItemDefaultImpl(..) | hir::ItemImpl(..) =>
 324                 DefPathData::Impl,
 325             hir::ItemEnum(..) | hir::ItemStruct(..) | hir::ItemUnion(..) |
 326             hir::ItemTrait(..) | hir::ItemExternCrate(..) | hir::ItemMod(..) |
 327             hir::ItemForeignMod(..) | hir::ItemTy(..) =>
 328                 DefPathData::TypeNs(i.name.as_str()),
 329             hir::ItemStatic(..) | hir::ItemConst(..) | hir::ItemFn(..) =>
 330                 DefPathData::ValueNs(i.name.as_str()),
 331             hir::ItemUse(..) => DefPathData::Misc,
 332         };
 333         let def = self.create_def(i.id, def_data);
 334
 335         self.with_parent(def, |this| {
 336             match i.node {
 337                 hir::ItemEnum(ref enum_definition, _) => {
 338                     for v in &enum_definition.variants {
 339                         let variant_def_index =
 340                             this.create_def(v.node.data.id(),
 341                                             DefPathData::EnumVariant(v.node.name.as_str()));
 342
 343                         this.with_parent(variant_def_index, |this| {
 344                             for field in v.node.data.fields() {
 345                                 this.create_def(field.id,
 346                                                 DefPathData::Field(field.name.as_str()));
 347                             }
 348                             if let Some(ref expr) = v.node.disr_expr {
 349                                 this.visit_hir_const_integer(expr);
 350                             }
 351                         });
 352                     }
 353                 }
 354                 hir::ItemStruct(ref struct_def, _) |
 355                 hir::ItemUnion(ref struct_def, _) => {
 356                     // If this is a tuple-like struct, register the constructor.
 357                     if !struct_def.is_struct() {
 358                         this.create_def(struct_def.id(),
 359                                         DefPathData::StructCtor);
 360                     }
 361
 362                     for field in struct_def.fields() {
 363                         this.create_def(field.id, DefPathData::Field(field.name.as_str()));
 364                     }
 365                 }
 366                 _ => {}
 367             }
 368             intravisit::walk_item(this, i);
 369         });
 370     }
 371
 372     fn visit_foreign_item(&mut self, foreign_item: &'ast hir::ForeignItem) {
 373         let def = self.create_def(foreign_item.id,
 374                                   DefPathData::ValueNs(foreign_item.name.as_str()));
 375
 376         self.with_parent(def, |this| {
 377             intravisit::walk_foreign_item(this, foreign_item);
 378         });
 379     }
 380
 381     fn visit_generics(&mut self, generics: &'ast hir::Generics) {
 382         for ty_param in generics.ty_params.iter() {
 383             self.create_def(ty_param.id, DefPathData::TypeParam(ty_param.name.as_str()));
 384         }
 385
 386         intravisit::walk_generics(self, generics);
 387     }
 388
 389     fn visit_trait_item(&mut self, ti: &'ast hir::TraitItem) {
 390         let def_data = match ti.node {
 391             hir::MethodTraitItem(..) | hir::ConstTraitItem(..) =>
 392                 DefPathData::ValueNs(ti.name.as_str()),
 393             hir::TypeTraitItem(..) => DefPathData::TypeNs(ti.name.as_str()),
 394         };
 395
 396         let def = self.create_def(ti.id, def_data);
 397         self.with_parent(def, |this| {
 398             if let hir::ConstTraitItem(_, Some(ref expr)) = ti.node {
 399                 this.create_def(expr.id, DefPathData::Initializer);
 400             }
 401
 402             intravisit::walk_trait_item(this, ti);
 403         });
 404     }
 405
 406     fn visit_impl_item(&mut self, ii: &'ast hir::ImplItem) {
 407         let def_data = match ii.node {
 408             hir::ImplItemKind::Method(..) | hir::ImplItemKind::Const(..) =>
 409                 DefPathData::ValueNs(ii.name.as_str()),
 410             hir::ImplItemKind::Type(..) => DefPathData::TypeNs(ii.name.as_str()),
 411         };
 412
 413         let def = self.create_def(ii.id, def_data);
 414         self.with_parent(def, |this| {
 415             if let hir::ImplItemKind::Const(_, ref expr) = ii.node {
 416                 this.create_def(expr.id, DefPathData::Initializer);
 417             }
 418
 419             intravisit::walk_impl_item(this, ii);
 420         });
 421     }
 422
 423     fn visit_pat(&mut self, pat: &'ast hir::Pat) {
 424         let parent_def = self.parent_def;
 425
 426         if let hir::PatKind::Binding(_, name, _) = pat.node {
 427             let def = self.create_def(pat.id, DefPathData::Binding(name.node.as_str()));
 428             self.parent_def = Some(def);
 429         }
 430
 431         intravisit::walk_pat(self, pat);
 432         self.parent_def = parent_def;
 433     }
 434
 435     fn visit_expr(&mut self, expr: &'ast hir::Expr) {
 436         let parent_def = self.parent_def;
 437
 438         if let hir::ExprRepeat(_, ref count) = expr.node {
 439             self.visit_hir_const_integer(count);
 440         }
 441
 442         if let hir::ExprClosure(..) = expr.node {
 443             let def = self.create_def(expr.id, DefPathData::ClosureExpr);
 444             self.parent_def = Some(def);
 445         }
 446
 447         intravisit::walk_expr(self, expr);
 448         self.parent_def = parent_def;
 449     }
 450
 451     fn visit_ty(&mut self, ty: &'ast hir::Ty) {
 452         if let hir::TyArray(_, ref length) = ty.node {
 453             self.visit_hir_const_integer(length);
 454         }
 455         if let hir::TyImplTrait(..) = ty.node {
 456             self.create_def(ty.id, DefPathData::ImplTrait);
 457         }
 458         intravisit::walk_ty(self, ty);
 459     }
 460
 461     fn visit_lifetime_def(&mut self, def: &'ast hir::LifetimeDef) {
 462         self.create_def(def.lifetime.id, DefPathData::LifetimeDef(def.lifetime.name.as_str()));
 463     }
 464
 465     fn visit_macro_def(&mut self, macro_def: &'ast hir::MacroDef) {
 466         self.create_def(macro_def.id, DefPathData::MacroDef(macro_def.name.as_str()));
 467     }
 468 }