src/librustc_save_analysis/lib.rs

   1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
   2 #![feature(nll)]
   3 #![feature(or_patterns)]
   4 #![recursion_limit = "256"]
   5
   6 mod dump_visitor;
   7 mod dumper;
   8 #[macro_use]
   9 mod span_utils;
  10 mod sig;
  11
  12 use rustc_ast::ast::{self, Attribute, NodeId, PatKind, DUMMY_NODE_ID};
  13 use rustc_ast::util::comments::strip_doc_comment_decoration;
  14 use rustc_ast::visit::{self, Visitor};
  15 use rustc_ast_pretty::pprust::{self, param_to_string, ty_to_string};
  16 use rustc_hir as hir;
  17 use rustc_hir::def::{CtorOf, DefKind as HirDefKind, Res};
  18 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
  19 use rustc_hir::Node;
  20 use rustc_middle::middle::cstore::ExternCrate;
  21 use rustc_middle::middle::privacy::AccessLevels;
  22 use rustc_middle::ty::{self, DefIdTree, TyCtxt};
  23 use rustc_middle::{bug, span_bug};
  24 use rustc_session::config::{CrateType, Input, OutputType};
  25 use rustc_session::output::{filename_for_metadata, out_filename};
  26 use rustc_span::source_map::Spanned;
  27 use rustc_span::*;
  28
  29 use std::cell::Cell;
  30 use std::default::Default;
  31 use std::env;
  32 use std::fs::File;
  33 use std::io::BufWriter;
  34 use std::path::{Path, PathBuf};
  35
  36 use dump_visitor::DumpVisitor;
  37 use span_utils::SpanUtils;
  38
  39 use rls_data::config::Config;
  40 use rls_data::{
  41     Analysis, Def, DefKind, ExternalCrateData, GlobalCrateId, Impl, ImplKind, MacroRef, Ref,
  42     RefKind, Relation, RelationKind, SpanData,
  43 };
  44
  45 use log::{debug, error, info};
  46
  47 pub struct SaveContext<'l, 'tcx> {
  48     tcx: TyCtxt<'tcx>,
  49     tables: &'l ty::TypeckTables<'tcx>,
  50     /// Used as a fallback when nesting the typeck tables during item processing
  51     /// (if these are not available for that item, e.g. don't own a body)
  52     empty_tables: &'l ty::TypeckTables<'tcx>,
  53     access_levels: &'l AccessLevels,
  54     span_utils: SpanUtils<'tcx>,
  55     config: Config,
  56     impl_counter: Cell<u32>,
  57 }
  58
  59 #[derive(Debug)]
  60 pub enum Data {
  61     RefData(Ref),
  62     DefData(Def),
  63     RelationData(Relation, Impl),
  64 }
  65
  66 impl<'l, 'tcx> SaveContext<'l, 'tcx> {
  67     fn span_from_span(&self, span: Span) -> SpanData {
  68         use rls_span::{Column, Row};
  69
  70         let sm = self.tcx.sess.source_map();
  71         let start = sm.lookup_char_pos(span.lo());
  72         let end = sm.lookup_char_pos(span.hi());
  73
  74         SpanData {
  75             file_name: start.file.name.to_string().into(),
  76             byte_start: span.lo().0,
  77             byte_end: span.hi().0,
  78             line_start: Row::new_one_indexed(start.line as u32),
  79             line_end: Row::new_one_indexed(end.line as u32),
  80             column_start: Column::new_one_indexed(start.col.0 as u32 + 1),
  81             column_end: Column::new_one_indexed(end.col.0 as u32 + 1),
  82         }
  83     }
  84
  85     // Returns path to the compilation output (e.g., libfoo-12345678.rmeta)
  86     pub fn compilation_output(&self, crate_name: &str) -> PathBuf {
  87         let sess = &self.tcx.sess;
  88         // Save-analysis is emitted per whole session, not per each crate type
  89         let crate_type = sess.crate_types.borrow()[0];
  90         let outputs = &*self.tcx.output_filenames(LOCAL_CRATE);
  91
  92         if outputs.outputs.contains_key(&OutputType::Metadata) {
  93             filename_for_metadata(sess, crate_name, outputs)
  94         } else if outputs.outputs.should_codegen() {
  95             out_filename(sess, crate_type, outputs, crate_name)
  96         } else {
  97             // Otherwise it's only a DepInfo, in which case we return early and
  98             // not even reach the analysis stage.
  99             unreachable!()
 100         }
 101     }
 102
 103     // List external crates used by the current crate.
 104     pub fn get_external_crates(&self) -> Vec<ExternalCrateData> {
 105         let mut result = Vec::with_capacity(self.tcx.crates().len());
 106
 107         for &n in self.tcx.crates().iter() {
 108             let span = match self.tcx.extern_crate(n.as_def_id()) {
 109                 Some(&ExternCrate { span, .. }) => span,
 110                 None => {
 111                     debug!("skipping crate {}, no data", n);
 112                     continue;
 113                 }
 114             };
 115             let lo_loc = self.span_utils.sess.source_map().lookup_char_pos(span.lo());
 116             result.push(ExternalCrateData {
 117                 // FIXME: change file_name field to PathBuf in rls-data
 118                 // https://github.com/nrc/rls-data/issues/7
 119                 file_name: self.span_utils.make_filename_string(&lo_loc.file),
 120                 num: n.as_u32(),
 121                 id: GlobalCrateId {
 122                     name: self.tcx.crate_name(n).to_string(),
 123                     disambiguator: self.tcx.crate_disambiguator(n).to_fingerprint().as_value(),
 124                 },
 125             });
 126         }
 127
 128         result
 129     }
 130
 131     pub fn get_extern_item_data(&self, item: &ast::ForeignItem) -> Option<Data> {
 132         let qualname = format!(
 133             "::{}",
 134             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id).to_def_id())
 135         );
 136         match item.kind {
 137             ast::ForeignItemKind::Fn(_, ref sig, ref generics, _) => {
 138                 filter!(self.span_utils, item.ident.span);
 139
 140                 Some(Data::DefData(Def {
 141                     kind: DefKind::ForeignFunction,
 142                     id: id_from_node_id(item.id, self),
 143                     span: self.span_from_span(item.ident.span),
 144                     name: item.ident.to_string(),
 145                     qualname,
 146                     value: make_signature(&sig.decl, generics),
 147                     parent: None,
 148                     children: vec![],
 149                     decl_id: None,
 150                     docs: self.docs_for_attrs(&item.attrs),
 151                     sig: sig::foreign_item_signature(item, self),
 152                     attributes: lower_attributes(item.attrs.clone(), self),
 153                 }))
 154             }
 155             ast::ForeignItemKind::Static(ref ty, _, _) => {
 156                 filter!(self.span_utils, item.ident.span);
 157
 158                 let id = id_from_node_id(item.id, self);
 159                 let span = self.span_from_span(item.ident.span);
 160
 161                 Some(Data::DefData(Def {
 162                     kind: DefKind::ForeignStatic,
 163                     id,
 164                     span,
 165                     name: item.ident.to_string(),
 166                     qualname,
 167                     value: ty_to_string(ty),
 168                     parent: None,
 169                     children: vec![],
 170                     decl_id: None,
 171                     docs: self.docs_for_attrs(&item.attrs),
 172                     sig: sig::foreign_item_signature(item, self),
 173                     attributes: lower_attributes(item.attrs.clone(), self),
 174                 }))
 175             }
 176             // FIXME(plietar): needs a new DefKind in rls-data
 177             ast::ForeignItemKind::TyAlias(..) => None,
 178             ast::ForeignItemKind::MacCall(..) => None,
 179         }
 180     }
 181
 182     pub fn get_item_data(&self, item: &ast::Item) -> Option<Data> {
 183         match item.kind {
 184             ast::ItemKind::Fn(_, ref sig, .., ref generics, _) => {
 185                 let qualname = format!(
 186                     "::{}",
 187                     self.tcx.def_path_str(
 188                         self.tcx.hir().local_def_id_from_node_id(item.id).to_def_id()
 189                     )
 190                 );
 191                 filter!(self.span_utils, item.ident.span);
 192                 Some(Data::DefData(Def {
 193                     kind: DefKind::Function,
 194                     id: id_from_node_id(item.id, self),
 195                     span: self.span_from_span(item.ident.span),
 196                     name: item.ident.to_string(),
 197                     qualname,
 198                     value: make_signature(&sig.decl, generics),
 199                     parent: None,
 200                     children: vec![],
 201                     decl_id: None,
 202                     docs: self.docs_for_attrs(&item.attrs),
 203                     sig: sig::item_signature(item, self),
 204                     attributes: lower_attributes(item.attrs.clone(), self),
 205                 }))
 206             }
 207             ast::ItemKind::Static(ref typ, ..) => {
 208                 let qualname = format!(
 209                     "::{}",
 210                     self.tcx.def_path_str(
 211                         self.tcx.hir().local_def_id_from_node_id(item.id).to_def_id()
 212                     )
 213                 );
 214
 215                 filter!(self.span_utils, item.ident.span);
 216
 217                 let id = id_from_node_id(item.id, self);
 218                 let span = self.span_from_span(item.ident.span);
 219
 220                 Some(Data::DefData(Def {
 221                     kind: DefKind::Static,
 222                     id,
 223                     span,
 224                     name: item.ident.to_string(),
 225                     qualname,
 226                     value: ty_to_string(&typ),
 227                     parent: None,
 228                     children: vec![],
 229                     decl_id: None,
 230                     docs: self.docs_for_attrs(&item.attrs),
 231                     sig: sig::item_signature(item, self),
 232                     attributes: lower_attributes(item.attrs.clone(), self),
 233                 }))
 234             }
 235             ast::ItemKind::Const(_, ref typ, _) => {
 236                 let qualname = format!(
 237                     "::{}",
 238                     self.tcx.def_path_str(
 239                         self.tcx.hir().local_def_id_from_node_id(item.id).to_def_id()
 240                     )
 241                 );
 242                 filter!(self.span_utils, item.ident.span);
 243
 244                 let id = id_from_node_id(item.id, self);
 245                 let span = self.span_from_span(item.ident.span);
 246
 247                 Some(Data::DefData(Def {
 248                     kind: DefKind::Const,
 249                     id,
 250                     span,
 251                     name: item.ident.to_string(),
 252                     qualname,
 253                     value: ty_to_string(typ),
 254                     parent: None,
 255                     children: vec![],
 256                     decl_id: None,
 257                     docs: self.docs_for_attrs(&item.attrs),
 258                     sig: sig::item_signature(item, self),
 259                     attributes: lower_attributes(item.attrs.clone(), self),
 260                 }))
 261             }
 262             ast::ItemKind::Mod(ref m) => {
 263                 let qualname = format!(
 264                     "::{}",
 265                     self.tcx.def_path_str(
 266                         self.tcx.hir().local_def_id_from_node_id(item.id).to_def_id()
 267                     )
 268                 );
 269
 270                 let sm = self.tcx.sess.source_map();
 271                 let filename = sm.span_to_filename(m.inner);
 272
 273                 filter!(self.span_utils, item.ident.span);
 274
 275                 Some(Data::DefData(Def {
 276                     kind: DefKind::Mod,
 277                     id: id_from_node_id(item.id, self),
 278                     name: item.ident.to_string(),
 279                     qualname,
 280                     span: self.span_from_span(item.ident.span),
 281                     value: filename.to_string(),
 282                     parent: None,
 283                     children: m.items.iter().map(|i| id_from_node_id(i.id, self)).collect(),
 284                     decl_id: None,
 285                     docs: self.docs_for_attrs(&item.attrs),
 286                     sig: sig::item_signature(item, self),
 287                     attributes: lower_attributes(item.attrs.clone(), self),
 288                 }))
 289             }
 290             ast::ItemKind::Enum(ref def, _) => {
 291                 let name = item.ident.to_string();
 292                 let qualname = format!(
 293                     "::{}",
 294                     self.tcx.def_path_str(
 295                         self.tcx.hir().local_def_id_from_node_id(item.id).to_def_id()
 296                     )
 297                 );
 298                 filter!(self.span_utils, item.ident.span);
 299                 let variants_str =
 300                     def.variants.iter().map(|v| v.ident.to_string()).collect::<Vec<_>>().join(", ");
 301                 let value = format!("{}::{{{}}}", name, variants_str);
 302                 Some(Data::DefData(Def {
 303                     kind: DefKind::Enum,
 304                     id: id_from_node_id(item.id, self),
 305                     span: self.span_from_span(item.ident.span),
 306                     name,
 307                     qualname,
 308                     value,
 309                     parent: None,
 310                     children: def.variants.iter().map(|v| id_from_node_id(v.id, self)).collect(),
 311                     decl_id: None,
 312                     docs: self.docs_for_attrs(&item.attrs),
 313                     sig: sig::item_signature(item, self),
 314                     attributes: lower_attributes(item.attrs.clone(), self),
 315                 }))
 316             }
 317             ast::ItemKind::Impl { ref of_trait, ref self_ty, ref items, .. } => {
 318                 if let ast::TyKind::Path(None, ref path) = self_ty.kind {
 319                     // Common case impl for a struct or something basic.
 320                     if generated_code(path.span) {
 321                         return None;
 322                     }
 323                     let sub_span = path.segments.last().unwrap().ident.span;
 324                     filter!(self.span_utils, sub_span);
 325
 326                     let impl_id = self.next_impl_id();
 327                     let span = self.span_from_span(sub_span);
 328
 329                     let type_data = self.lookup_def_id(self_ty.id);
 330                     type_data.map(|type_data| {
 331                         Data::RelationData(
 332                             Relation {
 333                                 kind: RelationKind::Impl { id: impl_id },
 334                                 span: span.clone(),
 335                                 from: id_from_def_id(type_data),
 336                                 to: of_trait
 337                                     .as_ref()
 338                                     .and_then(|t| self.lookup_def_id(t.ref_id))
 339                                     .map(id_from_def_id)
 340                                     .unwrap_or_else(null_id),
 341                             },
 342                             Impl {
 343                                 id: impl_id,
 344                                 kind: match *of_trait {
 345                                     Some(_) => ImplKind::Direct,
 346                                     None => ImplKind::Inherent,
 347                                 },
 348                                 span,
 349                                 value: String::new(),
 350                                 parent: None,
 351                                 children: items
 352                                     .iter()
 353                                     .map(|i| id_from_node_id(i.id, self))
 354                                     .collect(),
 355                                 docs: String::new(),
 356                                 sig: None,
 357                                 attributes: vec![],
 358                             },
 359                         )
 360                     })
 361                 } else {
 362                     None
 363                 }
 364             }
 365             _ => {
 366                 // FIXME
 367                 bug!();
 368             }
 369         }
 370     }
 371
 372     pub fn get_field_data(&self, field: &ast::StructField, scope: NodeId) -> Option<Def> {
 373         if let Some(ident) = field.ident {
 374             let name = ident.to_string();
 375             let qualname = format!(
 376                 "::{}::{}",
 377                 self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(scope).to_def_id()),
 378                 ident
 379             );
 380             filter!(self.span_utils, ident.span);
 381             let def_id = self.tcx.hir().local_def_id_from_node_id(field.id).to_def_id();
 382             let typ = self.tcx.type_of(def_id).to_string();
 383
 384             let id = id_from_node_id(field.id, self);
 385             let span = self.span_from_span(ident.span);
 386
 387             Some(Def {
 388                 kind: DefKind::Field,
 389                 id,
 390                 span,
 391                 name,
 392                 qualname,
 393                 value: typ,
 394                 parent: Some(id_from_node_id(scope, self)),
 395                 children: vec![],
 396                 decl_id: None,
 397                 docs: self.docs_for_attrs(&field.attrs),
 398                 sig: sig::field_signature(field, self),
 399                 attributes: lower_attributes(field.attrs.clone(), self),
 400             })
 401         } else {
 402             None
 403         }
 404     }
 405
 406     // FIXME would be nice to take a MethodItem here, but the ast provides both
 407     // trait and impl flavours, so the caller must do the disassembly.
 408     pub fn get_method_data(&self, id: ast::NodeId, ident: ast::Ident, span: Span) -> Option<Def> {
 409         // The qualname for a method is the trait name or name of the struct in an impl in
 410         // which the method is declared in, followed by the method's name.
 411         let (qualname, parent_scope, decl_id, docs, attributes) = match self
 412             .tcx
 413             .impl_of_method(self.tcx.hir().local_def_id_from_node_id(id).to_def_id())
 414         {
 415             Some(impl_id) => match self.tcx.hir().get_if_local(impl_id) {
 416                 Some(Node::Item(item)) => match item.kind {
 417                     hir::ItemKind::Impl { ref self_ty, .. } => {
 418                         let hir = self.tcx.hir();
 419
 420                         let mut qualname = String::from("<");
 421                         qualname.push_str(&rustc_hir_pretty::id_to_string(&hir, self_ty.hir_id));
 422
 423                         let trait_id = self.tcx.trait_id_of_impl(impl_id);
 424                         let mut docs = String::new();
 425                         let mut attrs = vec![];
 426                         if let Some(Node::ImplItem(item)) = hir.find(hir.node_id_to_hir_id(id)) {
 427                             docs = self.docs_for_attrs(&item.attrs);
 428                             attrs = item.attrs.to_vec();
 429                         }
 430
 431                         let mut decl_id = None;
 432                         if let Some(def_id) = trait_id {
 433                             // A method in a trait impl.
 434                             qualname.push_str(" as ");
 435                             qualname.push_str(&self.tcx.def_path_str(def_id));
 436
 437                             decl_id = self
 438                                 .tcx
 439                                 .associated_items(def_id)
 440                                 .filter_by_name_unhygienic(ident.name)
 441                                 .next()
 442                                 .map(|item| item.def_id);
 443                         }
 444                         qualname.push_str(">");
 445
 446                         (qualname, trait_id, decl_id, docs, attrs)
 447                     }
 448                     _ => {
 449                         span_bug!(span, "Container {:?} for method {} not an impl?", impl_id, id);
 450                     }
 451                 },
 452                 r => {
 453                     span_bug!(
 454                         span,
 455                         "Container {:?} for method {} is not a node item {:?}",
 456                         impl_id,
 457                         id,
 458                         r
 459                     );
 460                 }
 461             },
 462             None => match self
 463                 .tcx
 464                 .trait_of_item(self.tcx.hir().local_def_id_from_node_id(id).to_def_id())
 465             {
 466                 Some(def_id) => {
 467                     let mut docs = String::new();
 468                     let mut attrs = vec![];
 469                     let hir_id = self.tcx.hir().node_id_to_hir_id(id);
 470
 471                     if let Some(Node::TraitItem(item)) = self.tcx.hir().find(hir_id) {
 472                         docs = self.docs_for_attrs(&item.attrs);
 473                         attrs = item.attrs.to_vec();
 474                     }
 475
 476                     (
 477                         format!("::{}", self.tcx.def_path_str(def_id)),
 478                         Some(def_id),
 479                         None,
 480                         docs,
 481                         attrs,
 482                     )
 483                 }
 484                 None => {
 485                     debug!("could not find container for method {} at {:?}", id, span);
 486                     // This is not necessarily a bug, if there was a compilation error,
 487                     // the tables we need might not exist.
 488                     return None;
 489                 }
 490             },
 491         };
 492
 493         let qualname = format!("{}::{}", qualname, ident.name);
 494
 495         filter!(self.span_utils, ident.span);
 496
 497         Some(Def {
 498             kind: DefKind::Method,
 499             id: id_from_node_id(id, self),
 500             span: self.span_from_span(ident.span),
 501             name: ident.name.to_string(),
 502             qualname,
 503             // FIXME you get better data here by using the visitor.
 504             value: String::new(),
 505             parent: parent_scope.map(id_from_def_id),
 506             children: vec![],
 507             decl_id: decl_id.map(id_from_def_id),
 508             docs,
 509             sig: None,
 510             attributes: lower_attributes(attributes, self),
 511         })
 512     }
 513
 514     pub fn get_trait_ref_data(&self, trait_ref: &ast::TraitRef) -> Option<Ref> {
 515         self.lookup_def_id(trait_ref.ref_id).and_then(|def_id| {
 516             let span = trait_ref.path.span;
 517             if generated_code(span) {
 518                 return None;
 519             }
 520             let sub_span = trait_ref.path.segments.last().unwrap().ident.span;
 521             filter!(self.span_utils, sub_span);
 522             let span = self.span_from_span(sub_span);
 523             Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) })
 524         })
 525     }
 526
 527     pub fn get_expr_data(&self, expr: &ast::Expr) -> Option<Data> {
 528         let expr_hir_id = self.tcx.hir().node_id_to_hir_id(expr.id);
 529         let hir_node = self.tcx.hir().expect_expr(expr_hir_id);
 530         let ty = self.tables.expr_ty_adjusted_opt(&hir_node);
 531         if ty.is_none() || ty.unwrap().kind == ty::Error {
 532             return None;
 533         }
 534         match expr.kind {
 535             ast::ExprKind::Field(ref sub_ex, ident) => {
 536                 let sub_ex_hir_id = self.tcx.hir().node_id_to_hir_id(sub_ex.id);
 537                 let hir_node = match self.tcx.hir().find(sub_ex_hir_id) {
 538                     Some(Node::Expr(expr)) => expr,
 539                     _ => {
 540                         debug!(
 541                             "Missing or weird node for sub-expression {} in {:?}",
 542                             sub_ex.id, expr
 543                         );
 544                         return None;
 545                     }
 546                 };
 547                 match self.tables.expr_ty_adjusted(&hir_node).kind {
 548                     ty::Adt(def, _) if !def.is_enum() => {
 549                         let variant = &def.non_enum_variant();
 550                         filter!(self.span_utils, ident.span);
 551                         let span = self.span_from_span(ident.span);
 552                         Some(Data::RefData(Ref {
 553                             kind: RefKind::Variable,
 554                             span,
 555                             ref_id: self
 556                                 .tcx
 557                                 .find_field_index(ident, variant)
 558                                 .map(|index| id_from_def_id(variant.fields[index].did))
 559                                 .unwrap_or_else(null_id),
 560                         }))
 561                     }
 562                     ty::Tuple(..) => None,
 563                     _ => {
 564                         debug!("expected struct or union type, found {:?}", ty);
 565                         None
 566                     }
 567                 }
 568             }
 569             ast::ExprKind::Struct(ref path, ..) => {
 570                 match self.tables.expr_ty_adjusted(&hir_node).kind {
 571                     ty::Adt(def, _) if !def.is_enum() => {
 572                         let sub_span = path.segments.last().unwrap().ident.span;
 573                         filter!(self.span_utils, sub_span);
 574                         let span = self.span_from_span(sub_span);
 575                         Some(Data::RefData(Ref {
 576                             kind: RefKind::Type,
 577                             span,
 578                             ref_id: id_from_def_id(def.did),
 579                         }))
 580                     }
 581                     _ => {
 582                         // FIXME ty could legitimately be an enum, but then we will fail
 583                         // later if we try to look up the fields.
 584                         debug!("expected struct or union, found {:?}", ty);
 585                         None
 586                     }
 587                 }
 588             }
 589             ast::ExprKind::MethodCall(ref seg, ..) => {
 590                 let expr_hir_id = self.tcx.hir().definitions().node_id_to_hir_id(expr.id);
 591                 let method_id = match self.tables.type_dependent_def_id(expr_hir_id) {
 592                     Some(id) => id,
 593                     None => {
 594                         debug!("could not resolve method id for {:?}", expr);
 595                         return None;
 596                     }
 597                 };
 598                 let (def_id, decl_id) = match self.tcx.associated_item(method_id).container {
 599                     ty::ImplContainer(_) => (Some(method_id), None),
 600                     ty::TraitContainer(_) => (None, Some(method_id)),
 601                 };
 602                 let sub_span = seg.ident.span;
 603                 filter!(self.span_utils, sub_span);
 604                 let span = self.span_from_span(sub_span);
 605                 Some(Data::RefData(Ref {
 606                     kind: RefKind::Function,
 607                     span,
 608                     ref_id: def_id.or(decl_id).map(id_from_def_id).unwrap_or_else(null_id),
 609                 }))
 610             }
 611             ast::ExprKind::Path(_, ref path) => {
 612                 self.get_path_data(expr.id, path).map(Data::RefData)
 613             }
 614             _ => {
 615                 // FIXME
 616                 bug!();
 617             }
 618         }
 619     }
 620
 621     pub fn get_path_res(&self, id: NodeId) -> Res {
 622         let hir_id = self.tcx.hir().node_id_to_hir_id(id);
 623         match self.tcx.hir().get(hir_id) {
 624             Node::TraitRef(tr) => tr.path.res,
 625
 626             Node::Item(&hir::Item { kind: hir::ItemKind::Use(path, _), .. }) => path.res,
 627             Node::Visibility(&Spanned {
 628                 node: hir::VisibilityKind::Restricted { ref path, .. },
 629                 ..
 630             }) => path.res,
 631
 632             Node::PathSegment(seg) => match seg.res {
 633                 Some(res) if res != Res::Err => res,
 634                 _ => {
 635                     let parent_node = self.tcx.hir().get_parent_node(hir_id);
 636                     self.get_path_res(self.tcx.hir().hir_id_to_node_id(parent_node))
 637                 }
 638             },
 639
 640             Node::Expr(&hir::Expr { kind: hir::ExprKind::Struct(ref qpath, ..), .. }) => {
 641                 self.tables.qpath_res(qpath, hir_id)
 642             }
 643
 644             Node::Expr(&hir::Expr { kind: hir::ExprKind::Path(ref qpath), .. })
 645             | Node::Pat(&hir::Pat {
 646                 kind:
 647                     hir::PatKind::Path(ref qpath)
 648                     | hir::PatKind::Struct(ref qpath, ..)
 649                     | hir::PatKind::TupleStruct(ref qpath, ..),
 650                 ..
 651             })
 652             | Node::Ty(&hir::Ty { kind: hir::TyKind::Path(ref qpath), .. }) => {
 653                 self.tables.qpath_res(qpath, hir_id)
 654             }
 655
 656             Node::Binding(&hir::Pat {
 657                 kind: hir::PatKind::Binding(_, canonical_id, ..), ..
 658             }) => Res::Local(canonical_id),
 659
 660             _ => Res::Err,
 661         }
 662     }
 663
 664     pub fn get_path_data(&self, id: NodeId, path: &ast::Path) -> Option<Ref> {
 665         path.segments.last().and_then(|seg| {
 666             self.get_path_segment_data(seg).or_else(|| self.get_path_segment_data_with_id(seg, id))
 667         })
 668     }
 669
 670     pub fn get_path_segment_data(&self, path_seg: &ast::PathSegment) -> Option<Ref> {
 671         self.get_path_segment_data_with_id(path_seg, path_seg.id)
 672     }
 673
 674     fn get_path_segment_data_with_id(
 675         &self,
 676         path_seg: &ast::PathSegment,
 677         id: NodeId,
 678     ) -> Option<Ref> {
 679         // Returns true if the path is function type sugar, e.g., `Fn(A) -> B`.
 680         fn fn_type(seg: &ast::PathSegment) -> bool {
 681             if let Some(ref generic_args) = seg.args {
 682                 if let ast::GenericArgs::Parenthesized(_) = **generic_args {
 683                     return true;
 684                 }
 685             }
 686             false
 687         }
 688
 689         if id == DUMMY_NODE_ID {
 690             return None;
 691         }
 692
 693         let res = self.get_path_res(id);
 694         let span = path_seg.ident.span;
 695         filter!(self.span_utils, span);
 696         let span = self.span_from_span(span);
 697
 698         match res {
 699             Res::Local(id) => Some(Ref {
 700                 kind: RefKind::Variable,
 701                 span,
 702                 ref_id: id_from_node_id(self.tcx.hir().hir_id_to_node_id(id), self),
 703             }),
 704             Res::Def(HirDefKind::Trait, def_id) if fn_type(path_seg) => {
 705                 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) })
 706             }
 707             Res::Def(
 708                 HirDefKind::Struct
 709                 | HirDefKind::Variant
 710                 | HirDefKind::Union
 711                 | HirDefKind::Enum
 712                 | HirDefKind::TyAlias
 713                 | HirDefKind::ForeignTy
 714                 | HirDefKind::TraitAlias
 715                 | HirDefKind::AssocOpaqueTy
 716                 | HirDefKind::AssocTy
 717                 | HirDefKind::Trait
 718                 | HirDefKind::OpaqueTy
 719                 | HirDefKind::TyParam,
 720                 def_id,
 721             ) => Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) }),
 722             Res::Def(HirDefKind::ConstParam, def_id) => {
 723                 Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(def_id) })
 724             }
 725             Res::Def(HirDefKind::Ctor(CtorOf::Struct, ..), def_id) => {
 726                 // This is a reference to a tuple struct where the def_id points
 727                 // to an invisible constructor function. That is not a very useful
 728                 // def, so adjust to point to the tuple struct itself.
 729                 let parent_def_id = self.tcx.parent(def_id).unwrap();
 730                 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(parent_def_id) })
 731             }
 732             Res::Def(
 733                 HirDefKind::Static
 734                 | HirDefKind::Const
 735                 | HirDefKind::AssocConst
 736                 | HirDefKind::Ctor(..),
 737                 _,
 738             ) => Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(res.def_id()) }),
 739             Res::Def(HirDefKind::AssocFn, decl_id) => {
 740                 let def_id = if decl_id.is_local() {
 741                     let ti = self.tcx.associated_item(decl_id);
 742
 743                     self.tcx
 744                         .associated_items(ti.container.id())
 745                         .filter_by_name_unhygienic(ti.ident.name)
 746                         .find(|item| item.defaultness.has_value())
 747                         .map(|item| item.def_id)
 748                 } else {
 749                     None
 750                 };
 751                 Some(Ref {
 752                     kind: RefKind::Function,
 753                     span,
 754                     ref_id: id_from_def_id(def_id.unwrap_or(decl_id)),
 755                 })
 756             }
 757             Res::Def(HirDefKind::Fn, def_id) => {
 758                 Some(Ref { kind: RefKind::Function, span, ref_id: id_from_def_id(def_id) })
 759             }
 760             Res::Def(HirDefKind::Mod, def_id) => {
 761                 Some(Ref { kind: RefKind::Mod, span, ref_id: id_from_def_id(def_id) })
 762             }
 763             Res::PrimTy(..)
 764             | Res::SelfTy(..)
 765             | Res::Def(HirDefKind::Macro(..), _)
 766             | Res::ToolMod
 767             | Res::NonMacroAttr(..)
 768             | Res::SelfCtor(..)
 769             | Res::Err => None,
 770         }
 771     }
 772
 773     pub fn get_field_ref_data(
 774         &self,
 775         field_ref: &ast::Field,
 776         variant: &ty::VariantDef,
 777     ) -> Option<Ref> {
 778         filter!(self.span_utils, field_ref.ident.span);
 779         self.tcx.find_field_index(field_ref.ident, variant).map(|index| {
 780             let span = self.span_from_span(field_ref.ident.span);
 781             Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(variant.fields[index].did) }
 782         })
 783     }
 784
 785     /// Attempt to return MacroRef for any AST node.
 786     ///
 787     /// For a given piece of AST defined by the supplied Span and NodeId,
 788     /// returns `None` if the node is not macro-generated or the span is malformed,
 789     /// else uses the expansion callsite and callee to return some MacroRef.
 790     pub fn get_macro_use_data(&self, span: Span) -> Option<MacroRef> {
 791         if !generated_code(span) {
 792             return None;
 793         }
 794         // Note we take care to use the source callsite/callee, to handle
 795         // nested expansions and ensure we only generate data for source-visible
 796         // macro uses.
 797         let callsite = span.source_callsite();
 798         let callsite_span = self.span_from_span(callsite);
 799         let callee = span.source_callee()?;
 800
 801         let mac_name = match callee.kind {
 802             ExpnKind::Macro(mac_kind, name) => match mac_kind {
 803                 MacroKind::Bang => name,
 804
 805                 // Ignore attribute macros, their spans are usually mangled
 806                 // FIXME(eddyb) is this really the case anymore?
 807                 MacroKind::Attr | MacroKind::Derive => return None,
 808             },
 809
 810             // These are not macros.
 811             // FIXME(eddyb) maybe there is a way to handle them usefully?
 812             ExpnKind::Root | ExpnKind::AstPass(_) | ExpnKind::Desugaring(_) => return None,
 813         };
 814
 815         let callee_span = self.span_from_span(callee.def_site);
 816         Some(MacroRef {
 817             span: callsite_span,
 818             qualname: mac_name.to_string(), // FIXME: generate the real qualname
 819             callee_span,
 820         })
 821     }
 822
 823     fn lookup_def_id(&self, ref_id: NodeId) -> Option<DefId> {
 824         match self.get_path_res(ref_id) {
 825             Res::PrimTy(_) | Res::SelfTy(..) | Res::Err => None,
 826             def => def.opt_def_id(),
 827         }
 828     }
 829
 830     fn docs_for_attrs(&self, attrs: &[Attribute]) -> String {
 831         let mut result = String::new();
 832
 833         for attr in attrs {
 834             if let Some(val) = attr.doc_str() {
 835                 if attr.is_doc_comment() {
 836                     result.push_str(&strip_doc_comment_decoration(&val.as_str()));
 837                 } else {
 838                     result.push_str(&val.as_str());
 839                 }
 840                 result.push('\n');
 841             } else if attr.check_name(sym::doc) {
 842                 if let Some(meta_list) = attr.meta_item_list() {
 843                     meta_list
 844                         .into_iter()
 845                         .filter(|it| it.check_name(sym::include))
 846                         .filter_map(|it| it.meta_item_list().map(|l| l.to_owned()))
 847                         .flat_map(|it| it)
 848                         .filter(|meta| meta.check_name(sym::contents))
 849                         .filter_map(|meta| meta.value_str())
 850                         .for_each(|val| {
 851                             result.push_str(&val.as_str());
 852                             result.push('\n');
 853                         });
 854                 }
 855             }
 856         }
 857
 858         if !self.config.full_docs {
 859             if let Some(index) = result.find("\n\n") {
 860                 result.truncate(index);
 861             }
 862         }
 863
 864         result
 865     }
 866
 867     fn next_impl_id(&self) -> u32 {
 868         let next = self.impl_counter.get();
 869         self.impl_counter.set(next + 1);
 870         next
 871     }
 872 }
 873
 874 fn make_signature(decl: &ast::FnDecl, generics: &ast::Generics) -> String {
 875     let mut sig = "fn ".to_owned();
 876     if !generics.params.is_empty() {
 877         sig.push('<');
 878         sig.push_str(
 879             &generics
 880                 .params
 881                 .iter()
 882                 .map(|param| param.ident.to_string())
 883                 .collect::<Vec<_>>()
 884                 .join(", "),
 885         );
 886         sig.push_str("> ");
 887     }
 888     sig.push('(');
 889     sig.push_str(&decl.inputs.iter().map(param_to_string).collect::<Vec<_>>().join(", "));
 890     sig.push(')');
 891     match decl.output {
 892         ast::FnRetTy::Default(_) => sig.push_str(" -> ()"),
 893         ast::FnRetTy::Ty(ref t) => sig.push_str(&format!(" -> {}", ty_to_string(t))),
 894     }
 895
 896     sig
 897 }
 898
 899 // An AST visitor for collecting paths (e.g., the names of structs) and formal
 900 // variables (idents) from patterns.
 901 struct PathCollector<'l> {
 902     collected_paths: Vec<(NodeId, &'l ast::Path)>,
 903     collected_idents: Vec<(NodeId, ast::Ident, ast::Mutability)>,
 904 }
 905
 906 impl<'l> PathCollector<'l> {
 907     fn new() -> PathCollector<'l> {
 908         PathCollector { collected_paths: vec![], collected_idents: vec![] }
 909     }
 910 }
 911
 912 impl<'l> Visitor<'l> for PathCollector<'l> {
 913     fn visit_pat(&mut self, p: &'l ast::Pat) {
 914         match p.kind {
 915             PatKind::Struct(ref path, ..) => {
 916                 self.collected_paths.push((p.id, path));
 917             }
 918             PatKind::TupleStruct(ref path, ..) | PatKind::Path(_, ref path) => {
 919                 self.collected_paths.push((p.id, path));
 920             }
 921             PatKind::Ident(bm, ident, _) => {
 922                 debug!(
 923                     "PathCollector, visit ident in pat {}: {:?} {:?}",
 924                     ident, p.span, ident.span
 925                 );
 926                 let immut = match bm {
 927                     // Even if the ref is mut, you can't change the ref, only
 928                     // the data pointed at, so showing the initialising expression
 929                     // is still worthwhile.
 930                     ast::BindingMode::ByRef(_) => ast::Mutability::Not,
 931                     ast::BindingMode::ByValue(mt) => mt,
 932                 };
 933                 self.collected_idents.push((p.id, ident, immut));
 934             }
 935             _ => {}
 936         }
 937         visit::walk_pat(self, p);
 938     }
 939 }
 940
 941 /// Defines what to do with the results of saving the analysis.
 942 pub trait SaveHandler {
 943     fn save(&mut self, save_ctxt: &SaveContext<'_, '_>, analysis: &Analysis);
 944 }
 945
 946 /// Dump the save-analysis results to a file.
 947 pub struct DumpHandler<'a> {
 948     odir: Option<&'a Path>,
 949     cratename: String,
 950 }
 951
 952 impl<'a> DumpHandler<'a> {
 953     pub fn new(odir: Option<&'a Path>, cratename: &str) -> DumpHandler<'a> {
 954         DumpHandler { odir, cratename: cratename.to_owned() }
 955     }
 956
 957     fn output_file(&self, ctx: &SaveContext<'_, '_>) -> (BufWriter<File>, PathBuf) {
 958         let sess = &ctx.tcx.sess;
 959         let file_name = match ctx.config.output_file {
 960             Some(ref s) => PathBuf::from(s),
 961             None => {
 962                 let mut root_path = match self.odir {
 963                     Some(val) => val.join("save-analysis"),
 964                     None => PathBuf::from("save-analysis-temp"),
 965                 };
 966
 967                 if let Err(e) = std::fs::create_dir_all(&root_path) {
 968                     error!("Could not create directory {}: {}", root_path.display(), e);
 969                 }
 970
 971                 let executable =
 972                     sess.crate_types.borrow().iter().any(|ct| *ct == CrateType::Executable);
 973                 let mut out_name = if executable { String::new() } else { "lib".to_owned() };
 974                 out_name.push_str(&self.cratename);
 975                 out_name.push_str(&sess.opts.cg.extra_filename);
 976                 out_name.push_str(".json");
 977                 root_path.push(&out_name);
 978
 979                 root_path
 980             }
 981         };
 982
 983         info!("Writing output to {}", file_name.display());
 984
 985         let output_file = BufWriter::new(File::create(&file_name).unwrap_or_else(|e| {
 986             sess.fatal(&format!("Could not open {}: {}", file_name.display(), e))
 987         }));
 988
 989         (output_file, file_name)
 990     }
 991 }
 992
 993 impl SaveHandler for DumpHandler<'_> {
 994     fn save(&mut self, save_ctxt: &SaveContext<'_, '_>, analysis: &Analysis) {
 995         let sess = &save_ctxt.tcx.sess;
 996         let (output, file_name) = self.output_file(&save_ctxt);
 997         if let Err(e) = serde_json::to_writer(output, &analysis) {
 998             error!("Can't serialize save-analysis: {:?}", e);
 999         }
1000
1001         if sess.opts.json_artifact_notifications {
1002             sess.parse_sess.span_diagnostic.emit_artifact_notification(&file_name, "save-analysis");
1003         }
1004     }
1005 }
1006
1007 /// Call a callback with the results of save-analysis.
1008 pub struct CallbackHandler<'b> {
1009     pub callback: &'b mut dyn FnMut(&rls_data::Analysis),
1010 }
1011
1012 impl SaveHandler for CallbackHandler<'_> {
1013     fn save(&mut self, _: &SaveContext<'_, '_>, analysis: &Analysis) {
1014         (self.callback)(analysis)
1015     }
1016 }
1017
1018 pub fn process_crate<'l, 'tcx, H: SaveHandler>(
1019     tcx: TyCtxt<'tcx>,
1020     krate: &ast::Crate,
1021     cratename: &str,
1022     input: &'l Input,
1023     config: Option<Config>,
1024     mut handler: H,
1025 ) {
1026     tcx.dep_graph.with_ignore(|| {
1027         info!("Dumping crate {}", cratename);
1028
1029         // Privacy checking requires and is done after type checking; use a
1030         // fallback in case the access levels couldn't have been correctly computed.
1031         let access_levels = match tcx.sess.compile_status() {
1032             Ok(..) => tcx.privacy_access_levels(LOCAL_CRATE),
1033             Err(..) => tcx.arena.alloc(AccessLevels::default()),
1034         };
1035
1036         let save_ctxt = SaveContext {
1037             tcx,
1038             tables: &ty::TypeckTables::empty(None),
1039             empty_tables: &ty::TypeckTables::empty(None),
1040             access_levels: &access_levels,
1041             span_utils: SpanUtils::new(&tcx.sess),
1042             config: find_config(config),
1043             impl_counter: Cell::new(0),
1044         };
1045
1046         let mut visitor = DumpVisitor::new(save_ctxt);
1047
1048         visitor.dump_crate_info(cratename, krate);
1049         visitor.dump_compilation_options(input, cratename);
1050         visit::walk_crate(&mut visitor, krate);
1051
1052         handler.save(&visitor.save_ctxt, &visitor.analysis())
1053     })
1054 }
1055
1056 fn find_config(supplied: Option<Config>) -> Config {
1057     if let Some(config) = supplied {
1058         return config;
1059     }
1060
1061     match env::var_os("RUST_SAVE_ANALYSIS_CONFIG") {
1062         None => Config::default(),
1063         Some(config) => config
1064             .to_str()
1065             .ok_or(())
1066             .map_err(|_| error!("`RUST_SAVE_ANALYSIS_CONFIG` isn't UTF-8"))
1067             .and_then(|cfg| {
1068                 serde_json::from_str(cfg)
1069                     .map_err(|_| error!("Could not deserialize save-analysis config"))
1070             })
1071             .unwrap_or_default(),
1072     }
1073 }
1074
1075 // Utility functions for the module.
1076
1077 // Helper function to escape quotes in a string
1078 fn escape(s: String) -> String {
1079     s.replace("\"", "\"\"")
1080 }
1081
1082 // Helper function to determine if a span came from a
1083 // macro expansion or syntax extension.
1084 fn generated_code(span: Span) -> bool {
1085     span.from_expansion() || span.is_dummy()
1086 }
1087
1088 // DefId::index is a newtype and so the JSON serialisation is ugly. Therefore
1089 // we use our own Id which is the same, but without the newtype.
1090 fn id_from_def_id(id: DefId) -> rls_data::Id {
1091     rls_data::Id { krate: id.krate.as_u32(), index: id.index.as_u32() }
1092 }
1093
1094 fn id_from_node_id(id: NodeId, scx: &SaveContext<'_, '_>) -> rls_data::Id {
1095     let def_id = scx.tcx.hir().opt_local_def_id_from_node_id(id);
1096     def_id.map(|id| id_from_def_id(id.to_def_id())).unwrap_or_else(|| {
1097         // Create a *fake* `DefId` out of a `NodeId` by subtracting the `NodeId`
1098         // out of the maximum u32 value. This will work unless you have *billions*
1099         // of definitions in a single crate (very unlikely to actually happen).
1100         rls_data::Id { krate: LOCAL_CRATE.as_u32(), index: !id.as_u32() }
1101     })
1102 }
1103
1104 fn null_id() -> rls_data::Id {
1105     rls_data::Id { krate: u32::max_value(), index: u32::max_value() }
1106 }
1107
1108 fn lower_attributes(attrs: Vec<Attribute>, scx: &SaveContext<'_, '_>) -> Vec<rls_data::Attribute> {
1109     attrs
1110         .into_iter()
1111         // Only retain real attributes. Doc comments are lowered separately.
1112         .filter(|attr| !attr.has_name(sym::doc))
1113         .map(|mut attr| {
1114             // Remove the surrounding '#[..]' or '#![..]' of the pretty printed
1115             // attribute. First normalize all inner attribute (#![..]) to outer
1116             // ones (#[..]), then remove the two leading and the one trailing character.
1117             attr.style = ast::AttrStyle::Outer;
1118             let value = pprust::attribute_to_string(&attr);
1119             // This str slicing works correctly, because the leading and trailing characters
1120             // are in the ASCII range and thus exactly one byte each.
1121             let value = value[2..value.len() - 1].to_string();
1122
1123             rls_data::Attribute { value, span: scx.span_from_span(attr.span) }
1124         })
1125         .collect()
1126 }