src/librustc_save_analysis/lib.rs

   1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
   2 #![feature(custom_attribute)]
   3 #![feature(nll)]
   4 #![deny(rust_2018_idioms)]
   5 #![allow(unused_attributes)]
   6
   7 #![recursion_limit="256"]
   8
   9
  10 mod json_dumper;
  11 mod dump_visitor;
  12 #[macro_use]
  13 mod span_utils;
  14 mod sig;
  15
  16 use rustc::hir;
  17 use rustc::hir::def::Def as HirDef;
  18 use rustc::hir::Node;
  19 use rustc::hir::def_id::{DefId, LOCAL_CRATE};
  20 use rustc::middle::privacy::AccessLevels;
  21 use rustc::middle::cstore::ExternCrate;
  22 use rustc::session::config::{CrateType, Input, OutputType};
  23 use rustc::ty::{self, DefIdTree, TyCtxt};
  24 use rustc::{bug, span_bug};
  25 use rustc_typeck::hir_ty_to_ty;
  26 use rustc_codegen_utils::link::{filename_for_metadata, out_filename};
  27 use rustc_data_structures::sync::Lrc;
  28
  29 use std::cell::Cell;
  30 use std::default::Default;
  31 use std::env;
  32 use std::fs::File;
  33 use std::path::{Path, PathBuf};
  34
  35 use syntax::ast::{self, Attribute, DUMMY_NODE_ID, NodeId, PatKind};
  36 use syntax::source_map::Spanned;
  37 use syntax::parse::lexer::comments::strip_doc_comment_decoration;
  38 use syntax::print::pprust;
  39 use syntax::visit::{self, Visitor};
  40 use syntax::print::pprust::{arg_to_string, ty_to_string};
  41 use syntax::source_map::MacroAttribute;
  42 use syntax_pos::*;
  43
  44 use json_dumper::JsonDumper;
  45 use dump_visitor::DumpVisitor;
  46 use span_utils::SpanUtils;
  47
  48 use rls_data::{Def, DefKind, ExternalCrateData, GlobalCrateId, MacroRef, Ref, RefKind, Relation,
  49                RelationKind, SpanData, Impl, ImplKind};
  50 use rls_data::config::Config;
  51
  52 use log::{debug, error, info};
  53
  54
  55 pub struct SaveContext<'l, 'tcx: 'l> {
  56     tcx: TyCtxt<'l, 'tcx, 'tcx>,
  57     tables: &'l ty::TypeckTables<'tcx>,
  58     access_levels: &'l AccessLevels,
  59     span_utils: SpanUtils<'tcx>,
  60     config: Config,
  61     impl_counter: Cell<u32>,
  62 }
  63
  64 #[derive(Debug)]
  65 pub enum Data {
  66     RefData(Ref),
  67     DefData(Def),
  68     RelationData(Relation, Impl),
  69 }
  70
  71 impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
  72     fn span_from_span(&self, span: Span) -> SpanData {
  73         use rls_span::{Column, Row};
  74
  75         let cm = self.tcx.sess.source_map();
  76         let start = cm.lookup_char_pos(span.lo());
  77         let end = cm.lookup_char_pos(span.hi());
  78
  79         SpanData {
  80             file_name: start.file.name.to_string().into(),
  81             byte_start: span.lo().0,
  82             byte_end: span.hi().0,
  83             line_start: Row::new_one_indexed(start.line as u32),
  84             line_end: Row::new_one_indexed(end.line as u32),
  85             column_start: Column::new_one_indexed(start.col.0 as u32 + 1),
  86             column_end: Column::new_one_indexed(end.col.0 as u32 + 1),
  87         }
  88     }
  89
  90     // Returns path to the compilation output (e.g., libfoo-12345678.rmeta)
  91     pub fn compilation_output(&self, crate_name: &str) -> PathBuf {
  92         let sess = &self.tcx.sess;
  93         // Save-analysis is emitted per whole session, not per each crate type
  94         let crate_type = sess.crate_types.borrow()[0];
  95         let outputs = &*self.tcx.output_filenames(LOCAL_CRATE);
  96
  97         if outputs.outputs.contains_key(&OutputType::Metadata) {
  98             filename_for_metadata(sess, crate_name, outputs)
  99         } else if outputs.outputs.should_codegen() {
 100             out_filename(sess, crate_type, outputs, crate_name)
 101         } else {
 102             // Otherwise it's only a DepInfo, in which case we return early and
 103             // not even reach the analysis stage.
 104             unreachable!()
 105         }
 106     }
 107
 108     // List external crates used by the current crate.
 109     pub fn get_external_crates(&self) -> Vec<ExternalCrateData> {
 110         let mut result = Vec::with_capacity(self.tcx.crates().len());
 111
 112         for &n in self.tcx.crates().iter() {
 113             let span = match *self.tcx.extern_crate(n.as_def_id()) {
 114                 Some(ExternCrate { span, .. }) => span,
 115                 None => {
 116                     debug!("Skipping crate {}, no data", n);
 117                     continue;
 118                 }
 119             };
 120             let lo_loc = self.span_utils.sess.source_map().lookup_char_pos(span.lo());
 121             result.push(ExternalCrateData {
 122                 // FIXME: change file_name field to PathBuf in rls-data
 123                 // https://github.com/nrc/rls-data/issues/7
 124                 file_name: self.span_utils.make_filename_string(&lo_loc.file),
 125                 num: n.as_u32(),
 126                 id: GlobalCrateId {
 127                     name: self.tcx.crate_name(n).to_string(),
 128                     disambiguator: self.tcx.crate_disambiguator(n).to_fingerprint().as_value(),
 129                 },
 130             });
 131         }
 132
 133         result
 134     }
 135
 136     pub fn get_extern_item_data(&self, item: &ast::ForeignItem) -> Option<Data> {
 137         let qualname = format!("::{}",
 138             self.tcx.def_path_str(self.tcx.hir().local_def_id(item.id)));
 139         match item.node {
 140             ast::ForeignItemKind::Fn(ref decl, ref generics) => {
 141                 filter!(self.span_utils, item.ident.span);
 142
 143                 Some(Data::DefData(Def {
 144                     kind: DefKind::ForeignFunction,
 145                     id: id_from_node_id(item.id, self),
 146                     span: self.span_from_span(item.ident.span),
 147                     name: item.ident.to_string(),
 148                     qualname,
 149                     value: make_signature(decl, generics),
 150                     parent: None,
 151                     children: vec![],
 152                     decl_id: None,
 153                     docs: self.docs_for_attrs(&item.attrs),
 154                     sig: sig::foreign_item_signature(item, self),
 155                     attributes: lower_attributes(item.attrs.clone(), self),
 156                 }))
 157             }
 158             ast::ForeignItemKind::Static(ref ty, _) => {
 159                 filter!(self.span_utils, item.ident.span);
 160
 161                 let id = id_from_node_id(item.id, self);
 162                 let span = self.span_from_span(item.ident.span);
 163
 164                 Some(Data::DefData(Def {
 165                     kind: DefKind::ForeignStatic,
 166                     id,
 167                     span,
 168                     name: item.ident.to_string(),
 169                     qualname,
 170                     value: ty_to_string(ty),
 171                     parent: None,
 172                     children: vec![],
 173                     decl_id: None,
 174                     docs: self.docs_for_attrs(&item.attrs),
 175                     sig: sig::foreign_item_signature(item, self),
 176                     attributes: lower_attributes(item.attrs.clone(), self),
 177                 }))
 178             }
 179             // FIXME(plietar): needs a new DefKind in rls-data
 180             ast::ForeignItemKind::Ty => None,
 181             ast::ForeignItemKind::Macro(..) => None,
 182         }
 183     }
 184
 185     pub fn get_item_data(&self, item: &ast::Item) -> Option<Data> {
 186         match item.node {
 187             ast::ItemKind::Fn(ref decl, .., ref generics, _) => {
 188                 let qualname = format!("::{}",
 189                     self.tcx.def_path_str(self.tcx.hir().local_def_id(item.id)));
 190                 filter!(self.span_utils, item.ident.span);
 191                 Some(Data::DefData(Def {
 192                     kind: DefKind::Function,
 193                     id: id_from_node_id(item.id, self),
 194                     span: self.span_from_span(item.ident.span),
 195                     name: item.ident.to_string(),
 196                     qualname,
 197                     value: make_signature(decl, generics),
 198                     parent: None,
 199                     children: vec![],
 200                     decl_id: None,
 201                     docs: self.docs_for_attrs(&item.attrs),
 202                     sig: sig::item_signature(item, self),
 203                     attributes: lower_attributes(item.attrs.clone(), self),
 204                 }))
 205             }
 206             ast::ItemKind::Static(ref typ, ..) => {
 207                 let qualname = format!("::{}",
 208                     self.tcx.def_path_str(self.tcx.hir().local_def_id(item.id)));
 209
 210                 filter!(self.span_utils, item.ident.span);
 211
 212                 let id = id_from_node_id(item.id, self);
 213                 let span = self.span_from_span(item.ident.span);
 214
 215                 Some(Data::DefData(Def {
 216                     kind: DefKind::Static,
 217                     id,
 218                     span,
 219                     name: item.ident.to_string(),
 220                     qualname,
 221                     value: ty_to_string(&typ),
 222                     parent: None,
 223                     children: vec![],
 224                     decl_id: None,
 225                     docs: self.docs_for_attrs(&item.attrs),
 226                     sig: sig::item_signature(item, self),
 227                     attributes: lower_attributes(item.attrs.clone(), self),
 228                 }))
 229             }
 230             ast::ItemKind::Const(ref typ, _) => {
 231                 let qualname = format!("::{}",
 232                     self.tcx.def_path_str(self.tcx.hir().local_def_id(item.id)));
 233                 filter!(self.span_utils, item.ident.span);
 234
 235                 let id = id_from_node_id(item.id, self);
 236                 let span = self.span_from_span(item.ident.span);
 237
 238                 Some(Data::DefData(Def {
 239                     kind: DefKind::Const,
 240                     id,
 241                     span,
 242                     name: item.ident.to_string(),
 243                     qualname,
 244                     value: ty_to_string(typ),
 245                     parent: None,
 246                     children: vec![],
 247                     decl_id: None,
 248                     docs: self.docs_for_attrs(&item.attrs),
 249                     sig: sig::item_signature(item, self),
 250                     attributes: lower_attributes(item.attrs.clone(), self),
 251                 }))
 252             }
 253             ast::ItemKind::Mod(ref m) => {
 254                 let qualname = format!("::{}",
 255                     self.tcx.def_path_str(self.tcx.hir().local_def_id(item.id)));
 256
 257                 let cm = self.tcx.sess.source_map();
 258                 let filename = cm.span_to_filename(m.inner);
 259
 260                 filter!(self.span_utils, item.ident.span);
 261
 262                 Some(Data::DefData(Def {
 263                     kind: DefKind::Mod,
 264                     id: id_from_node_id(item.id, self),
 265                     name: item.ident.to_string(),
 266                     qualname,
 267                     span: self.span_from_span(item.ident.span),
 268                     value: filename.to_string(),
 269                     parent: None,
 270                     children: m.items
 271                         .iter()
 272                         .map(|i| id_from_node_id(i.id, self))
 273                         .collect(),
 274                     decl_id: None,
 275                     docs: self.docs_for_attrs(&item.attrs),
 276                     sig: sig::item_signature(item, self),
 277                     attributes: lower_attributes(item.attrs.clone(), self),
 278                 }))
 279             }
 280             ast::ItemKind::Enum(ref def, _) => {
 281                 let name = item.ident.to_string();
 282                 let qualname = format!("::{}",
 283                     self.tcx.def_path_str(self.tcx.hir().local_def_id(item.id)));
 284                 filter!(self.span_utils, item.ident.span);
 285                 let variants_str = def.variants
 286                     .iter()
 287                     .map(|v| v.node.ident.to_string())
 288                     .collect::<Vec<_>>()
 289                     .join(", ");
 290                 let value = format!("{}::{{{}}}", name, variants_str);
 291                 Some(Data::DefData(Def {
 292                     kind: DefKind::Enum,
 293                     id: id_from_node_id(item.id, self),
 294                     span: self.span_from_span(item.ident.span),
 295                     name,
 296                     qualname,
 297                     value,
 298                     parent: None,
 299                     children: def.variants
 300                         .iter()
 301                         .map(|v| id_from_node_id(v.node.data.id(), self))
 302                         .collect(),
 303                     decl_id: None,
 304                     docs: self.docs_for_attrs(&item.attrs),
 305                     sig: sig::item_signature(item, self),
 306                     attributes: lower_attributes(item.attrs.clone(), self),
 307                 }))
 308             }
 309             ast::ItemKind::Impl(.., ref trait_ref, ref typ, ref impls) => {
 310                 if let ast::TyKind::Path(None, ref path) = typ.node {
 311                     // Common case impl for a struct or something basic.
 312                     if generated_code(path.span) {
 313                         return None;
 314                     }
 315                     let sub_span = path.segments.last().unwrap().ident.span;
 316                     filter!(self.span_utils, sub_span);
 317
 318                     let impl_id = self.next_impl_id();
 319                     let span = self.span_from_span(sub_span);
 320
 321                     let type_data = self.lookup_ref_id(typ.id);
 322                     type_data.map(|type_data| {
 323                         Data::RelationData(Relation {
 324                             kind: RelationKind::Impl {
 325                                 id: impl_id,
 326                             },
 327                             span: span.clone(),
 328                             from: id_from_def_id(type_data),
 329                             to: trait_ref
 330                                 .as_ref()
 331                                 .and_then(|t| self.lookup_ref_id(t.ref_id))
 332                                 .map(id_from_def_id)
 333                                 .unwrap_or_else(|| null_id()),
 334                         },
 335                         Impl {
 336                             id: impl_id,
 337                             kind: match *trait_ref {
 338                                 Some(_) => ImplKind::Direct,
 339                                 None => ImplKind::Inherent,
 340                             },
 341                             span: span,
 342                             value: String::new(),
 343                             parent: None,
 344                             children: impls
 345                                 .iter()
 346                                 .map(|i| id_from_node_id(i.id, self))
 347                                 .collect(),
 348                             docs: String::new(),
 349                             sig: None,
 350                             attributes: vec![],
 351                         })
 352                     })
 353                 } else {
 354                     None
 355                 }
 356             }
 357             _ => {
 358                 // FIXME
 359                 bug!();
 360             }
 361         }
 362     }
 363
 364     pub fn get_field_data(&self, field: &ast::StructField, scope: NodeId) -> Option<Def> {
 365         if let Some(ident) = field.ident {
 366             let name = ident.to_string();
 367             let qualname = format!("::{}::{}",
 368                 self.tcx.def_path_str(self.tcx.hir().local_def_id(scope)),
 369                 ident);
 370             filter!(self.span_utils, ident.span);
 371             let def_id = self.tcx.hir().local_def_id(field.id);
 372             let typ = self.tcx.type_of(def_id).to_string();
 373
 374
 375             let id = id_from_node_id(field.id, self);
 376             let span = self.span_from_span(ident.span);
 377
 378             Some(Def {
 379                 kind: DefKind::Field,
 380                 id,
 381                 span,
 382                 name,
 383                 qualname,
 384                 value: typ,
 385                 parent: Some(id_from_node_id(scope, self)),
 386                 children: vec![],
 387                 decl_id: None,
 388                 docs: self.docs_for_attrs(&field.attrs),
 389                 sig: sig::field_signature(field, self),
 390                 attributes: lower_attributes(field.attrs.clone(), self),
 391             })
 392         } else {
 393             None
 394         }
 395     }
 396
 397     // FIXME would be nice to take a MethodItem here, but the ast provides both
 398     // trait and impl flavours, so the caller must do the disassembly.
 399     pub fn get_method_data(&self, id: ast::NodeId, ident: ast::Ident, span: Span) -> Option<Def> {
 400         // The qualname for a method is the trait name or name of the struct in an impl in
 401         // which the method is declared in, followed by the method's name.
 402         let (qualname, parent_scope, decl_id, docs, attributes) =
 403             match self.tcx.impl_of_method(self.tcx.hir().local_def_id(id)) {
 404                 Some(impl_id) => match self.tcx.hir().get_if_local(impl_id) {
 405                     Some(Node::Item(item)) => match item.node {
 406                         hir::ItemKind::Impl(.., ref ty, _) => {
 407                             let mut qualname = String::from("<");
 408                             qualname.push_str(&self.tcx.hir().hir_to_pretty_string(ty.hir_id));
 409
 410                             let trait_id = self.tcx.trait_id_of_impl(impl_id);
 411                             let mut decl_id = None;
 412                             let mut docs = String::new();
 413                             let mut attrs = vec![];
 414                             if let Some(Node::ImplItem(item)) = self.tcx.hir().find(id) {
 415                                 docs = self.docs_for_attrs(&item.attrs);
 416                                 attrs = item.attrs.to_vec();
 417                             }
 418
 419                             if let Some(def_id) = trait_id {
 420                                 // A method in a trait impl.
 421                                 qualname.push_str(" as ");
 422                                 qualname.push_str(&self.tcx.def_path_str(def_id));
 423                                 self.tcx
 424                                     .associated_items(def_id)
 425                                     .find(|item| item.ident.name == ident.name)
 426                                     .map(|item| decl_id = Some(item.def_id));
 427                             }
 428                             qualname.push_str(">");
 429
 430                             (qualname, trait_id, decl_id, docs, attrs)
 431                         }
 432                         _ => {
 433                             span_bug!(
 434                                 span,
 435                                 "Container {:?} for method {} not an impl?",
 436                                 impl_id,
 437                                 id
 438                             );
 439                         }
 440                     },
 441                     r => {
 442                         span_bug!(
 443                             span,
 444                             "Container {:?} for method {} is not a node item {:?}",
 445                             impl_id,
 446                             id,
 447                             r
 448                         );
 449                     }
 450                 },
 451                 None => match self.tcx.trait_of_item(self.tcx.hir().local_def_id(id)) {
 452                     Some(def_id) => {
 453                         let mut docs = String::new();
 454                         let mut attrs = vec![];
 455
 456                         if let Some(Node::TraitItem(item)) = self.tcx.hir().find(id) {
 457                             docs = self.docs_for_attrs(&item.attrs);
 458                             attrs = item.attrs.to_vec();
 459                         }
 460
 461                         (
 462                             format!("::{}", self.tcx.def_path_str(def_id)),
 463                             Some(def_id),
 464                             None,
 465                             docs,
 466                             attrs,
 467                         )
 468                     }
 469                     None => {
 470                         debug!("Could not find container for method {} at {:?}", id, span);
 471                         // This is not necessarily a bug, if there was a compilation error,
 472                         // the tables we need might not exist.
 473                         return None;
 474                     }
 475                 },
 476             };
 477
 478         let qualname = format!("{}::{}", qualname, ident.name);
 479
 480         filter!(self.span_utils, ident.span);
 481
 482         Some(Def {
 483             kind: DefKind::Method,
 484             id: id_from_node_id(id, self),
 485             span: self.span_from_span(ident.span),
 486             name: ident.name.to_string(),
 487             qualname,
 488             // FIXME you get better data here by using the visitor.
 489             value: String::new(),
 490             parent: parent_scope.map(|id| id_from_def_id(id)),
 491             children: vec![],
 492             decl_id: decl_id.map(|id| id_from_def_id(id)),
 493             docs,
 494             sig: None,
 495             attributes: lower_attributes(attributes, self),
 496         })
 497     }
 498
 499     pub fn get_trait_ref_data(&self, trait_ref: &ast::TraitRef) -> Option<Ref> {
 500         self.lookup_ref_id(trait_ref.ref_id).and_then(|def_id| {
 501             let span = trait_ref.path.span;
 502             if generated_code(span) {
 503                 return None;
 504             }
 505             let sub_span = trait_ref.path.segments.last().unwrap().ident.span;
 506             filter!(self.span_utils, sub_span);
 507             let span = self.span_from_span(sub_span);
 508             Some(Ref {
 509                 kind: RefKind::Type,
 510                 span,
 511                 ref_id: id_from_def_id(def_id),
 512             })
 513         })
 514     }
 515
 516     pub fn get_expr_data(&self, expr: &ast::Expr) -> Option<Data> {
 517         let hir_node = self.tcx.hir().expect_expr(expr.id);
 518         let ty = self.tables.expr_ty_adjusted_opt(&hir_node);
 519         if ty.is_none() || ty.unwrap().sty == ty::Error {
 520             return None;
 521         }
 522         match expr.node {
 523             ast::ExprKind::Field(ref sub_ex, ident) => {
 524                 let hir_node = match self.tcx.hir().find(sub_ex.id) {
 525                     Some(Node::Expr(expr)) => expr,
 526                     _ => {
 527                         debug!(
 528                             "Missing or weird node for sub-expression {} in {:?}",
 529                             sub_ex.id,
 530                             expr
 531                         );
 532                         return None;
 533                     }
 534                 };
 535                 match self.tables.expr_ty_adjusted(&hir_node).sty {
 536                     ty::Adt(def, _) if !def.is_enum() => {
 537                         let variant = &def.non_enum_variant();
 538                         let index = self.tcx.find_field_index(ident, variant).unwrap();
 539                         filter!(self.span_utils, ident.span);
 540                         let span = self.span_from_span(ident.span);
 541                         return Some(Data::RefData(Ref {
 542                             kind: RefKind::Variable,
 543                             span,
 544                             ref_id: id_from_def_id(variant.fields[index].did),
 545                         }));
 546                     }
 547                     ty::Tuple(..) => None,
 548                     _ => {
 549                         debug!("Expected struct or union type, found {:?}", ty);
 550                         None
 551                     }
 552                 }
 553             }
 554             ast::ExprKind::Struct(ref path, ..) => {
 555                 match self.tables.expr_ty_adjusted(&hir_node).sty {
 556                     ty::Adt(def, _) if !def.is_enum() => {
 557                         let sub_span = path.segments.last().unwrap().ident.span;
 558                         filter!(self.span_utils, sub_span);
 559                         let span = self.span_from_span(sub_span);
 560                         Some(Data::RefData(Ref {
 561                             kind: RefKind::Type,
 562                             span,
 563                             ref_id: id_from_def_id(def.did),
 564                         }))
 565                     }
 566                     _ => {
 567                         // FIXME ty could legitimately be an enum, but then we will fail
 568                         // later if we try to look up the fields.
 569                         debug!("expected struct or union, found {:?}", ty);
 570                         None
 571                     }
 572                 }
 573             }
 574             ast::ExprKind::MethodCall(ref seg, ..) => {
 575                 let expr_hir_id = self.tcx.hir().definitions().node_to_hir_id(expr.id);
 576                 let method_id = match self.tables.type_dependent_defs().get(expr_hir_id) {
 577                     Some(id) => id.def_id(),
 578                     None => {
 579                         debug!("Could not resolve method id for {:?}", expr);
 580                         return None;
 581                     }
 582                 };
 583                 let (def_id, decl_id) = match self.tcx.associated_item(method_id).container {
 584                     ty::ImplContainer(_) => (Some(method_id), None),
 585                     ty::TraitContainer(_) => (None, Some(method_id)),
 586                 };
 587                 let sub_span = seg.ident.span;
 588                 filter!(self.span_utils, sub_span);
 589                 let span = self.span_from_span(sub_span);
 590                 Some(Data::RefData(Ref {
 591                     kind: RefKind::Function,
 592                     span,
 593                     ref_id: def_id
 594                         .or(decl_id)
 595                         .map(|id| id_from_def_id(id))
 596                         .unwrap_or_else(|| null_id()),
 597                 }))
 598             }
 599             ast::ExprKind::Path(_, ref path) => {
 600                 self.get_path_data(expr.id, path).map(|d| Data::RefData(d))
 601             }
 602             _ => {
 603                 // FIXME
 604                 bug!();
 605             }
 606         }
 607     }
 608
 609     pub fn get_path_def(&self, id: NodeId) -> HirDef {
 610         match self.tcx.hir().get(id) {
 611             Node::TraitRef(tr) => tr.path.def,
 612
 613             Node::Item(&hir::Item {
 614                 node: hir::ItemKind::Use(ref path, _),
 615                 ..
 616             }) |
 617             Node::Visibility(&Spanned {
 618                 node: hir::VisibilityKind::Restricted { ref path, .. }, .. }) => path.def,
 619
 620             Node::PathSegment(seg) => {
 621                 match seg.def {
 622                     Some(def) if def != HirDef::Err => def,
 623                     _ => self.get_path_def(self.tcx.hir().get_parent_node(id)),
 624                 }
 625             }
 626
 627             Node::Expr(&hir::Expr {
 628                 node: hir::ExprKind::Struct(ref qpath, ..),
 629                 ..
 630             }) => {
 631                 let hir_id = self.tcx.hir().node_to_hir_id(id);
 632                 self.tables.qpath_def(qpath, hir_id)
 633             }
 634
 635             Node::Expr(&hir::Expr {
 636                 node: hir::ExprKind::Path(ref qpath),
 637                 ..
 638             }) |
 639             Node::Pat(&hir::Pat {
 640                 node: hir::PatKind::Path(ref qpath),
 641                 ..
 642             }) |
 643             Node::Pat(&hir::Pat {
 644                 node: hir::PatKind::Struct(ref qpath, ..),
 645                 ..
 646             }) |
 647             Node::Pat(&hir::Pat {
 648                 node: hir::PatKind::TupleStruct(ref qpath, ..),
 649                 ..
 650             }) => {
 651                 let hir_id = self.tcx.hir().node_to_hir_id(id);
 652                 self.tables.qpath_def(qpath, hir_id)
 653             }
 654
 655             Node::Binding(&hir::Pat {
 656                 node: hir::PatKind::Binding(_, canonical_id, ..),
 657                 ..
 658             }) => HirDef::Local(self.tcx.hir().hir_to_node_id(canonical_id)),
 659
 660             Node::Ty(ty) => if let hir::Ty {
 661                 node: hir::TyKind::Path(ref qpath),
 662                 ..
 663             } = *ty
 664             {
 665                 match *qpath {
 666                     hir::QPath::Resolved(_, ref path) => path.def,
 667                     hir::QPath::TypeRelative(..) => {
 668                         let ty = hir_ty_to_ty(self.tcx, ty);
 669                         if let ty::Projection(proj) = ty.sty {
 670                             return HirDef::AssociatedTy(proj.item_def_id);
 671                         }
 672                         HirDef::Err
 673                     }
 674                 }
 675             } else {
 676                 HirDef::Err
 677             },
 678
 679             _ => HirDef::Err,
 680         }
 681     }
 682
 683     pub fn get_path_data(&self, id: NodeId, path: &ast::Path) -> Option<Ref> {
 684         path.segments
 685             .last()
 686             .and_then(|seg| {
 687                 self.get_path_segment_data(seg)
 688                     .or_else(|| self.get_path_segment_data_with_id(seg, id))
 689             })
 690     }
 691
 692     pub fn get_path_segment_data(&self, path_seg: &ast::PathSegment) -> Option<Ref> {
 693         self.get_path_segment_data_with_id(path_seg, path_seg.id)
 694     }
 695
 696     fn get_path_segment_data_with_id(
 697         &self,
 698         path_seg: &ast::PathSegment,
 699         id: NodeId,
 700     ) -> Option<Ref> {
 701         // Returns true if the path is function type sugar, e.g., `Fn(A) -> B`.
 702         fn fn_type(seg: &ast::PathSegment) -> bool {
 703             if let Some(ref generic_args) = seg.args {
 704                 if let ast::GenericArgs::Parenthesized(_) = **generic_args {
 705                     return true;
 706                 }
 707             }
 708             false
 709         }
 710
 711         if id == DUMMY_NODE_ID {
 712             return None;
 713         }
 714
 715         let def = self.get_path_def(id);
 716         let span = path_seg.ident.span;
 717         filter!(self.span_utils, span);
 718         let span = self.span_from_span(span);
 719
 720         match def {
 721             HirDef::Upvar(id, ..) | HirDef::Local(id) => {
 722                 Some(Ref {
 723                     kind: RefKind::Variable,
 724                     span,
 725                     ref_id: id_from_node_id(id, self),
 726                 })
 727             }
 728             HirDef::Static(..) |
 729             HirDef::Const(..) |
 730             HirDef::AssociatedConst(..) |
 731             HirDef::VariantCtor(..) => {
 732                 Some(Ref {
 733                     kind: RefKind::Variable,
 734                     span,
 735                     ref_id: id_from_def_id(def.def_id()),
 736                 })
 737             }
 738             HirDef::Trait(def_id) if fn_type(path_seg) => {
 739                 Some(Ref {
 740                     kind: RefKind::Type,
 741                     span,
 742                     ref_id: id_from_def_id(def_id),
 743                 })
 744             }
 745             HirDef::Struct(def_id) |
 746             HirDef::Variant(def_id, ..) |
 747             HirDef::Union(def_id) |
 748             HirDef::Enum(def_id) |
 749             HirDef::TyAlias(def_id) |
 750             HirDef::ForeignTy(def_id) |
 751             HirDef::TraitAlias(def_id) |
 752             HirDef::AssociatedExistential(def_id) |
 753             HirDef::AssociatedTy(def_id) |
 754             HirDef::Trait(def_id) |
 755             HirDef::Existential(def_id) |
 756             HirDef::TyParam(def_id) => {
 757                 Some(Ref {
 758                     kind: RefKind::Type,
 759                     span,
 760                     ref_id: id_from_def_id(def_id),
 761                 })
 762             }
 763             HirDef::ConstParam(def_id) => {
 764                 Some(Ref {
 765                     kind: RefKind::Variable,
 766                     span,
 767                     ref_id: id_from_def_id(def_id),
 768                 })
 769             }
 770             HirDef::StructCtor(def_id, _) => {
 771                 // This is a reference to a tuple struct where the def_id points
 772                 // to an invisible constructor function. That is not a very useful
 773                 // def, so adjust to point to the tuple struct itself.
 774                 let parent_def_id = self.tcx.parent(def_id).unwrap();
 775                 Some(Ref {
 776                     kind: RefKind::Type,
 777                     span,
 778                     ref_id: id_from_def_id(parent_def_id),
 779                 })
 780             }
 781             HirDef::Method(decl_id) => {
 782                 let def_id = if decl_id.is_local() {
 783                     let ti = self.tcx.associated_item(decl_id);
 784                     self.tcx
 785                         .associated_items(ti.container.id())
 786                         .find(|item| item.ident.name == ti.ident.name &&
 787                                      item.defaultness.has_value())
 788                         .map(|item| item.def_id)
 789                 } else {
 790                     None
 791                 };
 792                 Some(Ref {
 793                     kind: RefKind::Function,
 794                     span,
 795                     ref_id: id_from_def_id(def_id.unwrap_or(decl_id)),
 796                 })
 797             }
 798             HirDef::Fn(def_id) => {
 799                 Some(Ref {
 800                     kind: RefKind::Function,
 801                     span,
 802                     ref_id: id_from_def_id(def_id),
 803                 })
 804             }
 805             HirDef::Mod(def_id) => {
 806                 Some(Ref {
 807                     kind: RefKind::Mod,
 808                     span,
 809                     ref_id: id_from_def_id(def_id),
 810                 })
 811             }
 812             HirDef::PrimTy(..) |
 813             HirDef::SelfTy(..) |
 814             HirDef::Label(..) |
 815             HirDef::Macro(..) |
 816             HirDef::ToolMod |
 817             HirDef::NonMacroAttr(..) |
 818             HirDef::SelfCtor(..) |
 819             HirDef::Err => None,
 820         }
 821     }
 822
 823     pub fn get_field_ref_data(
 824         &self,
 825         field_ref: &ast::Field,
 826         variant: &ty::VariantDef,
 827     ) -> Option<Ref> {
 828         filter!(self.span_utils, field_ref.ident.span);
 829         self.tcx.find_field_index(field_ref.ident, variant).map(|index| {
 830             let span = self.span_from_span(field_ref.ident.span);
 831             Ref {
 832                 kind: RefKind::Variable,
 833                 span,
 834                 ref_id: id_from_def_id(variant.fields[index].did),
 835             }
 836         })
 837     }
 838
 839     /// Attempt to return MacroRef for any AST node.
 840     ///
 841     /// For a given piece of AST defined by the supplied Span and NodeId,
 842     /// returns `None` if the node is not macro-generated or the span is malformed,
 843     /// else uses the expansion callsite and callee to return some MacroRef.
 844     pub fn get_macro_use_data(&self, span: Span) -> Option<MacroRef> {
 845         if !generated_code(span) {
 846             return None;
 847         }
 848         // Note we take care to use the source callsite/callee, to handle
 849         // nested expansions and ensure we only generate data for source-visible
 850         // macro uses.
 851         let callsite = span.source_callsite();
 852         let callsite_span = self.span_from_span(callsite);
 853         let callee = span.source_callee()?;
 854         let callee_span = callee.def_site?;
 855
 856         // Ignore attribute macros, their spans are usually mangled
 857         if let MacroAttribute(_) = callee.format {
 858             return None;
 859         }
 860
 861         // If the callee is an imported macro from an external crate, need to get
 862         // the source span and name from the session, as their spans are localized
 863         // when read in, and no longer correspond to the source.
 864         if let Some(mac) = self.tcx
 865             .sess
 866             .imported_macro_spans
 867             .borrow()
 868             .get(&callee_span)
 869         {
 870             let &(ref mac_name, mac_span) = mac;
 871             let mac_span = self.span_from_span(mac_span);
 872             return Some(MacroRef {
 873                 span: callsite_span,
 874                 qualname: mac_name.clone(), // FIXME: generate the real qualname
 875                 callee_span: mac_span,
 876             });
 877         }
 878
 879         let callee_span = self.span_from_span(callee_span);
 880         Some(MacroRef {
 881             span: callsite_span,
 882             qualname: callee.format.name().to_string(), // FIXME: generate the real qualname
 883             callee_span,
 884         })
 885     }
 886
 887     fn lookup_ref_id(&self, ref_id: NodeId) -> Option<DefId> {
 888         match self.get_path_def(ref_id) {
 889             HirDef::PrimTy(_) | HirDef::SelfTy(..) | HirDef::Err => None,
 890             def => Some(def.def_id()),
 891         }
 892     }
 893
 894     fn docs_for_attrs(&self, attrs: &[Attribute]) -> String {
 895         let mut result = String::new();
 896
 897         for attr in attrs {
 898             if attr.check_name("doc") {
 899                 if let Some(val) = attr.value_str() {
 900                     if attr.is_sugared_doc {
 901                         result.push_str(&strip_doc_comment_decoration(&val.as_str()));
 902                     } else {
 903                         result.push_str(&val.as_str());
 904                     }
 905                     result.push('\n');
 906                 } else if let Some(meta_list) = attr.meta_item_list() {
 907                     meta_list.into_iter()
 908                              .filter(|it| it.check_name("include"))
 909                              .filter_map(|it| it.meta_item_list().map(|l| l.to_owned()))
 910                              .flat_map(|it| it)
 911                              .filter(|meta| meta.check_name("contents"))
 912                              .filter_map(|meta| meta.value_str())
 913                              .for_each(|val| {
 914                                  result.push_str(&val.as_str());
 915                                  result.push('\n');
 916                              });
 917                 }
 918             }
 919         }
 920
 921         if !self.config.full_docs {
 922             if let Some(index) = result.find("\n\n") {
 923                 result.truncate(index);
 924             }
 925         }
 926
 927         result
 928     }
 929
 930     fn next_impl_id(&self) -> u32 {
 931         let next = self.impl_counter.get();
 932         self.impl_counter.set(next + 1);
 933         next
 934     }
 935 }
 936
 937 fn make_signature(decl: &ast::FnDecl, generics: &ast::Generics) -> String {
 938     let mut sig = "fn ".to_owned();
 939     if !generics.params.is_empty() {
 940         sig.push('<');
 941         sig.push_str(&generics
 942             .params
 943             .iter()
 944             .map(|param| param.ident.to_string())
 945             .collect::<Vec<_>>()
 946             .join(", "));
 947         sig.push_str("> ");
 948     }
 949     sig.push('(');
 950     sig.push_str(&decl.inputs
 951         .iter()
 952         .map(arg_to_string)
 953         .collect::<Vec<_>>()
 954         .join(", "));
 955     sig.push(')');
 956     match decl.output {
 957         ast::FunctionRetTy::Default(_) => sig.push_str(" -> ()"),
 958         ast::FunctionRetTy::Ty(ref t) => sig.push_str(&format!(" -> {}", ty_to_string(t))),
 959     }
 960
 961     sig
 962 }
 963
 964 // An AST visitor for collecting paths (e.g., the names of structs) and formal
 965 // variables (idents) from patterns.
 966 struct PathCollector<'l> {
 967     collected_paths: Vec<(NodeId, &'l ast::Path)>,
 968     collected_idents: Vec<(NodeId, ast::Ident, ast::Mutability)>,
 969 }
 970
 971 impl<'l> PathCollector<'l> {
 972     fn new() -> PathCollector<'l> {
 973         PathCollector {
 974             collected_paths: vec![],
 975             collected_idents: vec![],
 976         }
 977     }
 978 }
 979
 980 impl<'l, 'a: 'l> Visitor<'a> for PathCollector<'l> {
 981     fn visit_pat(&mut self, p: &'a ast::Pat) {
 982         match p.node {
 983             PatKind::Struct(ref path, ..) => {
 984                 self.collected_paths.push((p.id, path));
 985             }
 986             PatKind::TupleStruct(ref path, ..) | PatKind::Path(_, ref path) => {
 987                 self.collected_paths.push((p.id, path));
 988             }
 989             PatKind::Ident(bm, ident, _) => {
 990                 debug!(
 991                     "PathCollector, visit ident in pat {}: {:?} {:?}",
 992                     ident,
 993                     p.span,
 994                     ident.span
 995                 );
 996                 let immut = match bm {
 997                     // Even if the ref is mut, you can't change the ref, only
 998                     // the data pointed at, so showing the initialising expression
 999                     // is still worthwhile.
1000                     ast::BindingMode::ByRef(_) => ast::Mutability::Immutable,
1001                     ast::BindingMode::ByValue(mt) => mt,
1002                 };
1003                 self.collected_idents
1004                     .push((p.id, ident, immut));
1005             }
1006             _ => {}
1007         }
1008         visit::walk_pat(self, p);
1009     }
1010 }
1011
1012 /// Defines what to do with the results of saving the analysis.
1013 pub trait SaveHandler {
1014     fn save<'l, 'tcx>(
1015         &mut self,
1016         save_ctxt: SaveContext<'l, 'tcx>,
1017         krate: &ast::Crate,
1018         cratename: &str,
1019         input: &'l Input,
1020     );
1021 }
1022
1023 /// Dump the save-analysis results to a file.
1024 pub struct DumpHandler<'a> {
1025     odir: Option<&'a Path>,
1026     cratename: String,
1027 }
1028
1029 impl<'a> DumpHandler<'a> {
1030     pub fn new(odir: Option<&'a Path>, cratename: &str) -> DumpHandler<'a> {
1031         DumpHandler {
1032             odir,
1033             cratename: cratename.to_owned(),
1034         }
1035     }
1036
1037     fn output_file(&self, ctx: &SaveContext<'_, '_>) -> File {
1038         let sess = &ctx.tcx.sess;
1039         let file_name = match ctx.config.output_file {
1040             Some(ref s) => PathBuf::from(s),
1041             None => {
1042                 let mut root_path = match self.odir {
1043                     Some(val) => val.join("save-analysis"),
1044                     None => PathBuf::from("save-analysis-temp"),
1045                 };
1046
1047                 if let Err(e) = std::fs::create_dir_all(&root_path) {
1048                     error!("Could not create directory {}: {}", root_path.display(), e);
1049                 }
1050
1051                 let executable = sess.crate_types
1052                     .borrow()
1053                     .iter()
1054                     .any(|ct| *ct == CrateType::Executable);
1055                 let mut out_name = if executable {
1056                     String::new()
1057                 } else {
1058                     "lib".to_owned()
1059                 };
1060                 out_name.push_str(&self.cratename);
1061                 out_name.push_str(&sess.opts.cg.extra_filename);
1062                 out_name.push_str(".json");
1063                 root_path.push(&out_name);
1064
1065                 root_path
1066             }
1067         };
1068
1069         info!("Writing output to {}", file_name.display());
1070
1071         let output_file = File::create(&file_name).unwrap_or_else(
1072             |e| sess.fatal(&format!("Could not open {}: {}", file_name.display(), e)),
1073         );
1074
1075         output_file
1076     }
1077 }
1078
1079 impl<'a> SaveHandler for DumpHandler<'a> {
1080     fn save<'l, 'tcx>(
1081         &mut self,
1082         save_ctxt: SaveContext<'l, 'tcx>,
1083         krate: &ast::Crate,
1084         cratename: &str,
1085         input: &'l Input,
1086     ) {
1087         let output = &mut self.output_file(&save_ctxt);
1088         let mut dumper = JsonDumper::new(output, save_ctxt.config.clone());
1089         let mut visitor = DumpVisitor::new(save_ctxt, &mut dumper);
1090
1091         visitor.dump_crate_info(cratename, krate);
1092         visitor.dump_compilation_options(input, cratename);
1093         visit::walk_crate(&mut visitor, krate);
1094     }
1095 }
1096
1097 /// Call a callback with the results of save-analysis.
1098 pub struct CallbackHandler<'b> {
1099     pub callback: &'b mut dyn FnMut(&rls_data::Analysis),
1100 }
1101
1102 impl<'b> SaveHandler for CallbackHandler<'b> {
1103     fn save<'l, 'tcx>(
1104         &mut self,
1105         save_ctxt: SaveContext<'l, 'tcx>,
1106         krate: &ast::Crate,
1107         cratename: &str,
1108         input: &'l Input,
1109     ) {
1110         // We're using the JsonDumper here because it has the format of the
1111         // save-analysis results that we will pass to the callback. IOW, we are
1112         // using the JsonDumper to collect the save-analysis results, but not
1113         // actually to dump them to a file. This is all a bit convoluted and
1114         // there is certainly a simpler design here trying to get out (FIXME).
1115         let mut dumper = JsonDumper::with_callback(self.callback, save_ctxt.config.clone());
1116         let mut visitor = DumpVisitor::new(save_ctxt, &mut dumper);
1117
1118         visitor.dump_crate_info(cratename, krate);
1119         visitor.dump_compilation_options(input, cratename);
1120         visit::walk_crate(&mut visitor, krate);
1121     }
1122 }
1123
1124 pub fn process_crate<'l, 'tcx, H: SaveHandler>(
1125     tcx: TyCtxt<'l, 'tcx, 'tcx>,
1126     krate: &ast::Crate,
1127     cratename: &str,
1128     input: &'l Input,
1129     config: Option<Config>,
1130     mut handler: H,
1131 ) {
1132     tcx.dep_graph.with_ignore(|| {
1133         info!("Dumping crate {}", cratename);
1134
1135         // Privacy checking requires and is done after type checking; use a
1136         // fallback in case the access levels couldn't have been correctly computed.
1137         let access_levels = match tcx.sess.compile_status() {
1138             Ok(..) => tcx.privacy_access_levels(LOCAL_CRATE),
1139             Err(..) => Lrc::new(AccessLevels::default()),
1140         };
1141
1142         let save_ctxt = SaveContext {
1143             tcx,
1144             tables: &ty::TypeckTables::empty(None),
1145             access_levels: &access_levels,
1146             span_utils: SpanUtils::new(&tcx.sess),
1147             config: find_config(config),
1148             impl_counter: Cell::new(0),
1149         };
1150
1151         handler.save(save_ctxt, krate, cratename, input)
1152     })
1153 }
1154
1155 fn find_config(supplied: Option<Config>) -> Config {
1156     if let Some(config) = supplied {
1157         return config;
1158     }
1159     match env::var_os("RUST_SAVE_ANALYSIS_CONFIG") {
1160         Some(config_string) => rustc_serialize::json::decode(config_string.to_str().unwrap())
1161             .expect("Could not deserialize save-analysis config"),
1162         None => Config::default(),
1163     }
1164 }
1165
1166 // Utility functions for the module.
1167
1168 // Helper function to escape quotes in a string
1169 fn escape(s: String) -> String {
1170     s.replace("\"", "\"\"")
1171 }
1172
1173 // Helper function to determine if a span came from a
1174 // macro expansion or syntax extension.
1175 fn generated_code(span: Span) -> bool {
1176     span.ctxt() != NO_EXPANSION || span.is_dummy()
1177 }
1178
1179 // DefId::index is a newtype and so the JSON serialisation is ugly. Therefore
1180 // we use our own Id which is the same, but without the newtype.
1181 fn id_from_def_id(id: DefId) -> rls_data::Id {
1182     rls_data::Id {
1183         krate: id.krate.as_u32(),
1184         index: id.index.as_raw_u32(),
1185     }
1186 }
1187
1188 fn id_from_node_id(id: NodeId, scx: &SaveContext<'_, '_>) -> rls_data::Id {
1189     let def_id = scx.tcx.hir().opt_local_def_id(id);
1190     def_id.map(|id| id_from_def_id(id)).unwrap_or_else(|| {
1191         // Create a *fake* `DefId` out of a `NodeId` by subtracting the `NodeId`
1192         // out of the maximum u32 value. This will work unless you have *billions*
1193         // of definitions in a single crate (very unlikely to actually happen).
1194         rls_data::Id {
1195             krate: LOCAL_CRATE.as_u32(),
1196             index: !id.as_u32(),
1197         }
1198     })
1199 }
1200
1201 fn null_id() -> rls_data::Id {
1202     rls_data::Id {
1203         krate: u32::max_value(),
1204         index: u32::max_value(),
1205     }
1206 }
1207
1208 fn lower_attributes(attrs: Vec<Attribute>, scx: &SaveContext<'_, '_>) -> Vec<rls_data::Attribute> {
1209     attrs.into_iter()
1210     // Only retain real attributes. Doc comments are lowered separately.
1211     .filter(|attr| attr.path != "doc")
1212     .map(|mut attr| {
1213         // Remove the surrounding '#[..]' or '#![..]' of the pretty printed
1214         // attribute. First normalize all inner attribute (#![..]) to outer
1215         // ones (#[..]), then remove the two leading and the one trailing character.
1216         attr.style = ast::AttrStyle::Outer;
1217         let value = pprust::attribute_to_string(&attr);
1218         // This str slicing works correctly, because the leading and trailing characters
1219         // are in the ASCII range and thus exactly one byte each.
1220         let value = value[2..value.len()-1].to_string();
1221
1222         rls_data::Attribute {
1223             value,
1224             span: scx.span_from_span(attr.span),
1225         }
1226     }).collect()
1227 }