src/librustc_save_analysis/lib.rs

   1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
  12       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
  13       html_root_url = "https://doc.rust-lang.org/nightly/")]
  14 #![deny(warnings)]
  15
  16 #![feature(custom_attribute)]
  17 #![allow(unused_attributes)]
  18
  19 #[macro_use] extern crate rustc;
  20
  21 #[macro_use] extern crate log;
  22 #[macro_use] extern crate syntax;
  23 extern crate rustc_data_structures;
  24 extern crate rustc_serialize;
  25 extern crate rustc_typeck;
  26 extern crate syntax_pos;
  27
  28 extern crate rls_data;
  29 extern crate rls_span;
  30
  31
  32 mod json_dumper;
  33 mod dump_visitor;
  34 #[macro_use]
  35 mod span_utils;
  36 mod sig;
  37
  38 use rustc::hir;
  39 use rustc::hir::def::Def as HirDef;
  40 use rustc::hir::map::{Node, NodeItem};
  41 use rustc::hir::def_id::{LOCAL_CRATE, DefId};
  42 use rustc::session::config::CrateType::CrateTypeExecutable;
  43 use rustc::ty::{self, TyCtxt};
  44 use rustc_typeck::hir_ty_to_ty;
  45
  46 use std::default::Default;
  47 use std::env;
  48 use std::fs::File;
  49 use std::path::{Path, PathBuf};
  50
  51 use syntax::ast::{self, NodeId, PatKind, Attribute};
  52 use syntax::parse::lexer::comments::strip_doc_comment_decoration;
  53 use syntax::parse::token;
  54 use syntax::print::pprust;
  55 use syntax::symbol::keywords;
  56 use syntax::visit::{self, Visitor};
  57 use syntax::print::pprust::{ty_to_string, arg_to_string};
  58 use syntax::codemap::MacroAttribute;
  59 use syntax_pos::*;
  60
  61 use json_dumper::JsonDumper;
  62 use dump_visitor::DumpVisitor;
  63 use span_utils::SpanUtils;
  64
  65 use rls_data::{Ref, RefKind, SpanData, MacroRef, Def, DefKind, Relation, RelationKind,
  66                ExternalCrateData};
  67 use rls_data::config::Config;
  68
  69
  70 pub struct SaveContext<'l, 'tcx: 'l> {
  71     tcx: TyCtxt<'l, 'tcx, 'tcx>,
  72     tables: &'l ty::TypeckTables<'tcx>,
  73     analysis: &'l ty::CrateAnalysis,
  74     span_utils: SpanUtils<'tcx>,
  75     config: Config,
  76 }
  77
  78 #[derive(Debug)]
  79 pub enum Data {
  80     RefData(Ref),
  81     DefData(Def),
  82     RelationData(Relation),
  83 }
  84
  85 macro_rules! option_try(
  86     ($e:expr) => (match $e { Some(e) => e, None => return None })
  87 );
  88
  89 impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
  90     fn span_from_span(&self, span: Span) -> SpanData {
  91         use rls_span::{Row, Column};
  92
  93         let cm = self.tcx.sess.codemap();
  94         let start = cm.lookup_char_pos(span.lo());
  95         let end = cm.lookup_char_pos(span.hi());
  96
  97         SpanData {
  98             file_name: start.file.name.clone().into(),
  99             byte_start: span.lo().0,
 100             byte_end: span.hi().0,
 101             line_start: Row::new_one_indexed(start.line as u32),
 102             line_end: Row::new_one_indexed(end.line as u32),
 103             column_start: Column::new_one_indexed(start.col.0 as u32 + 1),
 104             column_end: Column::new_one_indexed(end.col.0 as u32 + 1),
 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::new();
 111
 112         for &n in self.tcx.crates().iter() {
 113             let span = match *self.tcx.extern_crate(n.as_def_id()) {
 114                 Some(ref c) => c.span,
 115                 None => {
 116                     debug!("Skipping crate {}, no data", n);
 117                     continue;
 118                 }
 119             };
 120             let lo_loc = self.span_utils.sess.codemap().lookup_char_pos(span.lo());
 121             result.push(ExternalCrateData {
 122                 name: self.tcx.crate_name(n).to_string(),
 123                 num: n.as_u32(),
 124                 file_name: SpanUtils::make_path_string(&lo_loc.file.name),
 125             });
 126         }
 127
 128         result
 129     }
 130
 131     pub fn get_extern_item_data(&self, item: &ast::ForeignItem) -> Option<Data> {
 132         let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 133         match item.node {
 134             ast::ForeignItemKind::Fn(ref decl, ref generics) => {
 135                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Fn);
 136                 filter!(self.span_utils, sub_span, item.span, None);
 137
 138                 Some(Data::DefData(Def {
 139                     kind: DefKind::Function,
 140                     id: id_from_node_id(item.id, self),
 141                     span: self.span_from_span(sub_span.unwrap()),
 142                     name: item.ident.to_string(),
 143                     qualname,
 144                     value: make_signature(decl, generics),
 145                     parent: None,
 146                     children: vec![],
 147                     decl_id: None,
 148                     docs: self.docs_for_attrs(&item.attrs),
 149                     sig: sig::foreign_item_signature(item, self),
 150                     attributes: lower_attributes(item.attrs.clone(), self),
 151                 }))
 152             }
 153             ast::ForeignItemKind::Static(ref ty, m) => {
 154                 let keyword = if m { keywords::Mut } else { keywords::Static };
 155                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keyword);
 156                 filter!(self.span_utils, sub_span, item.span, None);
 157
 158                 let id = ::id_from_node_id(item.id, self);
 159                 let span = self.span_from_span(sub_span.unwrap());
 160
 161                 Some(Data::DefData(Def {
 162                     kind: DefKind::Static,
 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         }
 177     }
 178
 179     pub fn get_item_data(&self, item: &ast::Item) -> Option<Data> {
 180         match item.node {
 181             ast::ItemKind::Fn(ref decl, .., ref generics, _) => {
 182                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 183                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Fn);
 184                 filter!(self.span_utils, sub_span, item.span, None);
 185                 Some(Data::DefData(Def {
 186                     kind: DefKind::Function,
 187                     id: id_from_node_id(item.id, self),
 188                     span: self.span_from_span(sub_span.unwrap()),
 189                     name: item.ident.to_string(),
 190                     qualname,
 191                     value: make_signature(decl, generics),
 192                     parent: None,
 193                     children: vec![],
 194                     decl_id: None,
 195                     docs: self.docs_for_attrs(&item.attrs),
 196                     sig: sig::item_signature(item, self),
 197                     attributes: lower_attributes(item.attrs.clone(), self),
 198                 }))
 199             }
 200             ast::ItemKind::Static(ref typ, mt, _) => {
 201                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 202
 203                 let keyword = match mt {
 204                     ast::Mutability::Mutable => keywords::Mut,
 205                     ast::Mutability::Immutable => keywords::Static,
 206                 };
 207
 208                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keyword);
 209                 filter!(self.span_utils, sub_span, item.span, None);
 210
 211                 let id = id_from_node_id(item.id, self);
 212                 let span = self.span_from_span(sub_span.unwrap());
 213
 214                 Some(Data::DefData(Def {
 215                     kind: DefKind::Static,
 216                     id,
 217                     span,
 218                     name: item.ident.to_string(),
 219                     qualname,
 220                     value: ty_to_string(&typ),
 221                     parent: None,
 222                     children: vec![],
 223                     decl_id: None,
 224                     docs: self.docs_for_attrs(&item.attrs),
 225                     sig: sig::item_signature(item, self),
 226                     attributes: lower_attributes(item.attrs.clone(), self),
 227                 }))
 228             }
 229             ast::ItemKind::Const(ref typ, _) => {
 230                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 231                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Const);
 232                 filter!(self.span_utils, sub_span, item.span, None);
 233
 234                 let id = id_from_node_id(item.id, self);
 235                 let span = self.span_from_span(sub_span.unwrap());
 236
 237                 Some(Data::DefData(Def {
 238                     kind: DefKind::Const,
 239                     id,
 240                     span,
 241                     name: item.ident.to_string(),
 242                     qualname,
 243                     value: ty_to_string(typ),
 244                     parent: None,
 245                     children: vec![],
 246                     decl_id: None,
 247                     docs: self.docs_for_attrs(&item.attrs),
 248                     sig: sig::item_signature(item, self),
 249                     attributes: lower_attributes(item.attrs.clone(), self),
 250                 }))
 251             }
 252             ast::ItemKind::Mod(ref m) => {
 253                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 254
 255                 let cm = self.tcx.sess.codemap();
 256                 let filename = cm.span_to_filename(m.inner);
 257
 258                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Mod);
 259                 filter!(self.span_utils, sub_span, item.span, None);
 260
 261                 Some(Data::DefData(Def {
 262                     kind: DefKind::Mod,
 263                     id: id_from_node_id(item.id, self),
 264                     name: item.ident.to_string(),
 265                     qualname,
 266                     span: self.span_from_span(sub_span.unwrap()),
 267                     value: filename,
 268                     parent: None,
 269                     children: m.items.iter().map(|i| id_from_node_id(i.id, self)).collect(),
 270                     decl_id: None,
 271                     docs: self.docs_for_attrs(&item.attrs),
 272                     sig: sig::item_signature(item, self),
 273                     attributes: lower_attributes(item.attrs.clone(), self),
 274                 }))
 275             }
 276             ast::ItemKind::Enum(ref def, _) => {
 277                 let name = item.ident.to_string();
 278                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 279                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Enum);
 280                 filter!(self.span_utils, sub_span, item.span, None);
 281                 let variants_str = def.variants.iter()
 282                                       .map(|v| v.node.name.to_string())
 283                                       .collect::<Vec<_>>()
 284                                       .join(", ");
 285                 let value = format!("{}::{{{}}}", name, variants_str);
 286                 Some(Data::DefData(Def {
 287                     kind: DefKind::Enum,
 288                     id: id_from_node_id(item.id, self),
 289                     span: self.span_from_span(sub_span.unwrap()),
 290                     name,
 291                     qualname,
 292                     value,
 293                     parent: None,
 294                     children: def.variants
 295                                  .iter()
 296                                  .map(|v| id_from_node_id(v.node.data.id(), self))
 297                                  .collect(),
 298                     decl_id: None,
 299                     docs: self.docs_for_attrs(&item.attrs),
 300                     sig: sig::item_signature(item, self),
 301                     attributes: lower_attributes(item.attrs.to_owned(), self),
 302                 }))
 303             }
 304             ast::ItemKind::Impl(.., ref trait_ref, ref typ, _) => {
 305                 if let ast::TyKind::Path(None, ref path) = typ.node {
 306                     // Common case impl for a struct or something basic.
 307                     if generated_code(path.span) {
 308                         return None;
 309                     }
 310                     let sub_span = self.span_utils.sub_span_for_type_name(path.span);
 311                     filter!(self.span_utils, sub_span, typ.span, None);
 312
 313                     let type_data = self.lookup_ref_id(typ.id);
 314                     type_data.map(|type_data| Data::RelationData(Relation {
 315                         kind: RelationKind::Impl,
 316                         span: self.span_from_span(sub_span.unwrap()),
 317                         from: id_from_def_id(type_data),
 318                         to: trait_ref.as_ref()
 319                                      .and_then(|t| self.lookup_ref_id(t.ref_id))
 320                                      .map(id_from_def_id)
 321                                      .unwrap_or(null_id()),
 322                     }))
 323                 } else {
 324                     None
 325                 }
 326             }
 327             _ => {
 328                 // FIXME
 329                 bug!();
 330             }
 331         }
 332     }
 333
 334     pub fn get_field_data(&self,
 335                           field: &ast::StructField,
 336                           scope: NodeId)
 337                           -> Option<Def> {
 338         if let Some(ident) = field.ident {
 339             let name = ident.to_string();
 340             let qualname = format!("::{}::{}", self.tcx.node_path_str(scope), ident);
 341             let sub_span = self.span_utils.sub_span_before_token(field.span, token::Colon);
 342             filter!(self.span_utils, sub_span, field.span, None);
 343             let def_id = self.tcx.hir.local_def_id(field.id);
 344             let typ = self.tcx.type_of(def_id).to_string();
 345
 346
 347             let id = id_from_node_id(field.id, self);
 348             let span = self.span_from_span(sub_span.unwrap());
 349
 350             Some(Def {
 351                 kind: DefKind::Field,
 352                 id,
 353                 span,
 354                 name,
 355                 qualname,
 356                 value: typ,
 357                 parent: Some(id_from_node_id(scope, self)),
 358                 children: vec![],
 359                 decl_id: None,
 360                 docs: self.docs_for_attrs(&field.attrs),
 361                 sig: sig::field_signature(field, self),
 362                 attributes: lower_attributes(field.attrs.clone(), self),
 363             })
 364         } else {
 365             None
 366         }
 367     }
 368
 369     // FIXME would be nice to take a MethodItem here, but the ast provides both
 370     // trait and impl flavours, so the caller must do the disassembly.
 371     pub fn get_method_data(&self,
 372                            id: ast::NodeId,
 373                            name: ast::Name,
 374                            span: Span)
 375                            -> Option<Def> {
 376         // The qualname for a method is the trait name or name of the struct in an impl in
 377         // which the method is declared in, followed by the method's name.
 378         let (qualname, parent_scope, decl_id, docs, attributes) =
 379           match self.tcx.impl_of_method(self.tcx.hir.local_def_id(id)) {
 380             Some(impl_id) => match self.tcx.hir.get_if_local(impl_id) {
 381                 Some(Node::NodeItem(item)) => {
 382                     match item.node {
 383                         hir::ItemImpl(.., ref ty, _) => {
 384                             let mut result = String::from("<");
 385                             result.push_str(&self.tcx.hir.node_to_pretty_string(ty.id));
 386
 387                             let mut trait_id = self.tcx.trait_id_of_impl(impl_id);
 388                             let mut decl_id = None;
 389                             if let Some(def_id) = trait_id {
 390                                 result.push_str(" as ");
 391                                 result.push_str(&self.tcx.item_path_str(def_id));
 392                                 self.tcx.associated_items(def_id)
 393                                     .find(|item| item.name == name)
 394                                     .map(|item| decl_id = Some(item.def_id));
 395                             } else {
 396                                 if let Some(NodeItem(item)) = self.tcx.hir.find(id) {
 397                                     if let hir::ItemImpl(_, _, _, _, _, ref ty, _) = item.node {
 398                                         trait_id = self.lookup_ref_id(ty.id);
 399                                     }
 400                                 }
 401                             }
 402                             result.push_str(">");
 403
 404                             (result, trait_id, decl_id,
 405                              self.docs_for_attrs(&item.attrs),
 406                              item.attrs.to_vec())
 407                         }
 408                         _ => {
 409                             span_bug!(span,
 410                                       "Container {:?} for method {} not an impl?",
 411                                       impl_id,
 412                                       id);
 413                         }
 414                     }
 415                 }
 416                 r => {
 417                     span_bug!(span,
 418                               "Container {:?} for method {} is not a node item {:?}",
 419                               impl_id,
 420                               id,
 421                               r);
 422                 }
 423             },
 424             None => match self.tcx.trait_of_item(self.tcx.hir.local_def_id(id)) {
 425                 Some(def_id) => {
 426                     match self.tcx.hir.get_if_local(def_id) {
 427                         Some(Node::NodeItem(item)) => {
 428                             (format!("::{}", self.tcx.item_path_str(def_id)),
 429                              Some(def_id), None,
 430                              self.docs_for_attrs(&item.attrs),
 431                              item.attrs.to_vec())
 432                         }
 433                         r => {
 434                             span_bug!(span,
 435                                       "Could not find container {:?} for \
 436                                        method {}, got {:?}",
 437                                       def_id,
 438                                       id,
 439                                       r);
 440                         }
 441                     }
 442                 }
 443                 None => {
 444                     debug!("Could not find container for method {} at {:?}", id, span);
 445                     // This is not necessarily a bug, if there was a compilation error, the tables
 446                     // we need might not exist.
 447                     return None;
 448                 }
 449             },
 450         };
 451
 452         let qualname = format!("{}::{}", qualname, name);
 453
 454         let sub_span = self.span_utils.sub_span_after_keyword(span, keywords::Fn);
 455         filter!(self.span_utils, sub_span, span, None);
 456
 457         Some(Def {
 458             kind: DefKind::Method,
 459             id: id_from_node_id(id, self),
 460             span: self.span_from_span(sub_span.unwrap()),
 461             name: name.to_string(),
 462             qualname,
 463             // FIXME you get better data here by using the visitor.
 464             value: String::new(),
 465             parent: parent_scope.map(|id| id_from_def_id(id)),
 466             children: vec![],
 467             decl_id: decl_id.map(|id| id_from_def_id(id)),
 468             docs,
 469             sig: None,
 470             attributes: lower_attributes(attributes, self),
 471         })
 472     }
 473
 474     pub fn get_trait_ref_data(&self,
 475                               trait_ref: &ast::TraitRef)
 476                               -> Option<Ref> {
 477         self.lookup_ref_id(trait_ref.ref_id).and_then(|def_id| {
 478             let span = trait_ref.path.span;
 479             if generated_code(span) {
 480                 return None;
 481             }
 482             let sub_span = self.span_utils.sub_span_for_type_name(span).or(Some(span));
 483             filter!(self.span_utils, sub_span, span, None);
 484             let span = self.span_from_span(sub_span.unwrap());
 485             Some(Ref {
 486                 kind: RefKind::Type,
 487                 span,
 488                 ref_id: id_from_def_id(def_id),
 489             })
 490         })
 491     }
 492
 493     pub fn get_expr_data(&self, expr: &ast::Expr) -> Option<Data> {
 494         let hir_node = self.tcx.hir.expect_expr(expr.id);
 495         let ty = self.tables.expr_ty_adjusted_opt(&hir_node);
 496         if ty.is_none() || ty.unwrap().sty == ty::TyError {
 497             return None;
 498         }
 499         match expr.node {
 500             ast::ExprKind::Field(ref sub_ex, ident) => {
 501                 let hir_node = match self.tcx.hir.find(sub_ex.id) {
 502                     Some(Node::NodeExpr(expr)) => expr,
 503                     _ => {
 504                         debug!("Missing or weird node for sub-expression {} in {:?}",
 505                                sub_ex.id, expr);
 506                         return None;
 507                     }
 508                 };
 509                 match self.tables.expr_ty_adjusted(&hir_node).sty {
 510                     ty::TyAdt(def, _) if !def.is_enum() => {
 511                         let f = def.struct_variant().field_named(ident.node.name);
 512                         let sub_span = self.span_utils.span_for_last_ident(expr.span);
 513                         filter!(self.span_utils, sub_span, expr.span, None);
 514                         let span = self.span_from_span(sub_span.unwrap());
 515                         return Some(Data::RefData(Ref {
 516                             kind: RefKind::Variable,
 517                             span,
 518                             ref_id: id_from_def_id(f.did),
 519                         }));
 520                     }
 521                     _ => {
 522                         debug!("Expected struct or union type, found {:?}", ty);
 523                         None
 524                     }
 525                 }
 526             }
 527             ast::ExprKind::Struct(ref path, ..) => {
 528                 match self.tables.expr_ty_adjusted(&hir_node).sty {
 529                     ty::TyAdt(def, _) if !def.is_enum() => {
 530                         let sub_span = self.span_utils.span_for_last_ident(path.span);
 531                         filter!(self.span_utils, sub_span, path.span, None);
 532                         let span = self.span_from_span(sub_span.unwrap());
 533                         Some(Data::RefData(Ref {
 534                             kind: RefKind::Type,
 535                             span,
 536                             ref_id: id_from_def_id(def.did),
 537                         }))
 538                     }
 539                     _ => {
 540                         // FIXME ty could legitimately be an enum, but then we will fail
 541                         // later if we try to look up the fields.
 542                         debug!("expected struct or union, found {:?}", ty);
 543                         None
 544                     }
 545                 }
 546             }
 547             ast::ExprKind::MethodCall(..) => {
 548                 let expr_hir_id = self.tcx.hir.definitions().node_to_hir_id(expr.id);
 549                 let method_id = self.tables.type_dependent_defs()[expr_hir_id].def_id();
 550                 let (def_id, decl_id) = match self.tcx.associated_item(method_id).container {
 551                     ty::ImplContainer(_) => (Some(method_id), None),
 552                     ty::TraitContainer(_) => (None, Some(method_id)),
 553                 };
 554                 let sub_span = self.span_utils.sub_span_for_meth_name(expr.span);
 555                 filter!(self.span_utils, sub_span, expr.span, None);
 556                 let span = self.span_from_span(sub_span.unwrap());
 557                 Some(Data::RefData(Ref {
 558                     kind: RefKind::Function,
 559                     span,
 560                     ref_id: def_id.or(decl_id).map(|id| id_from_def_id(id)).unwrap_or(null_id()),
 561                 }))
 562             }
 563             ast::ExprKind::Path(_, ref path) => {
 564                 self.get_path_data(expr.id, path).map(|d| Data::RefData(d))
 565             }
 566             _ => {
 567                 // FIXME
 568                 bug!();
 569             }
 570         }
 571     }
 572
 573     pub fn get_path_def(&self, id: NodeId) -> HirDef {
 574         match self.tcx.hir.get(id) {
 575             Node::NodeTraitRef(tr) => tr.path.def,
 576
 577             Node::NodeItem(&hir::Item { node: hir::ItemUse(ref path, _), .. }) |
 578             Node::NodeVisibility(&hir::Visibility::Restricted { ref path, .. }) => path.def,
 579
 580             Node::NodeExpr(&hir::Expr { node: hir::ExprPath(ref qpath), .. }) |
 581             Node::NodeExpr(&hir::Expr { node: hir::ExprStruct(ref qpath, ..), .. }) |
 582             Node::NodePat(&hir::Pat { node: hir::PatKind::Path(ref qpath), .. }) |
 583             Node::NodePat(&hir::Pat { node: hir::PatKind::Struct(ref qpath, ..), .. }) |
 584             Node::NodePat(&hir::Pat { node: hir::PatKind::TupleStruct(ref qpath, ..), .. }) => {
 585                 let hir_id = self.tcx.hir.node_to_hir_id(id);
 586                 self.tables.qpath_def(qpath, hir_id)
 587             }
 588
 589             Node::NodeBinding(&hir::Pat {
 590                 node: hir::PatKind::Binding(_, canonical_id, ..), ..
 591             }) => HirDef::Local(canonical_id),
 592
 593             Node::NodeTy(ty) => {
 594                 if let hir::Ty { node: hir::TyPath(ref qpath), .. } = *ty {
 595                     match *qpath {
 596                         hir::QPath::Resolved(_, ref path) => path.def,
 597                         hir::QPath::TypeRelative(..) => {
 598                             let ty = hir_ty_to_ty(self.tcx, ty);
 599                             if let ty::TyProjection(proj) = ty.sty {
 600                                 return HirDef::AssociatedTy(proj.item_def_id);
 601                             }
 602                             HirDef::Err
 603                         }
 604                     }
 605                 } else {
 606                     HirDef::Err
 607                 }
 608             }
 609
 610             _ => HirDef::Err
 611         }
 612     }
 613
 614     pub fn get_path_data(&self, id: NodeId, path: &ast::Path) -> Option<Ref> {
 615         let def = self.get_path_def(id);
 616         let sub_span = self.span_utils.span_for_last_ident(path.span);
 617         filter!(self.span_utils, sub_span, path.span, None);
 618         match def {
 619             HirDef::Upvar(id, ..) |
 620             HirDef::Local(id) => {
 621                 let span = self.span_from_span(sub_span.unwrap());
 622                 Some(Ref {
 623                     kind: RefKind::Variable,
 624                     span,
 625                     ref_id: id_from_node_id(id, self),
 626                 })
 627             }
 628             HirDef::Static(..) |
 629             HirDef::Const(..) |
 630             HirDef::AssociatedConst(..) |
 631             HirDef::StructCtor(..) |
 632             HirDef::VariantCtor(..) => {
 633                 let span = self.span_from_span(sub_span.unwrap());
 634                 Some(Ref {
 635                     kind: RefKind::Variable,
 636                     span,
 637                     ref_id: id_from_def_id(def.def_id()),
 638                 })
 639             }
 640             HirDef::Struct(def_id) |
 641             HirDef::Variant(def_id, ..) |
 642             HirDef::Union(def_id) |
 643             HirDef::Enum(def_id) |
 644             HirDef::TyAlias(def_id) |
 645             HirDef::AssociatedTy(def_id) |
 646             HirDef::Trait(def_id) |
 647             HirDef::TyParam(def_id) => {
 648                 let span = self.span_from_span(sub_span.unwrap());
 649                 Some(Ref {
 650                     kind: RefKind::Type,
 651                     span,
 652                     ref_id: id_from_def_id(def_id),
 653                 })
 654             }
 655             HirDef::Method(decl_id) => {
 656                 let sub_span = self.span_utils.sub_span_for_meth_name(path.span);
 657                 filter!(self.span_utils, sub_span, path.span, None);
 658                 let def_id = if decl_id.is_local() {
 659                     let ti = self.tcx.associated_item(decl_id);
 660                     self.tcx.associated_items(ti.container.id())
 661                         .find(|item| item.name == ti.name && item.defaultness.has_value())
 662                         .map(|item| item.def_id)
 663                 } else {
 664                     None
 665                 };
 666                 let span = self.span_from_span(sub_span.unwrap());
 667                 Some(Ref {
 668                     kind: RefKind::Function,
 669                     span,
 670                     ref_id: id_from_def_id(def_id.unwrap_or(decl_id)),
 671                 })
 672             }
 673             HirDef::Fn(def_id) => {
 674                 let span = self.span_from_span(sub_span.unwrap());
 675                 Some(Ref {
 676                     kind: RefKind::Function,
 677                     span,
 678                     ref_id: id_from_def_id(def_id),
 679                 })
 680             }
 681             HirDef::Mod(def_id) => {
 682                 let span = self.span_from_span(sub_span.unwrap());
 683                 Some(Ref {
 684                     kind: RefKind::Mod,
 685                     span,
 686                     ref_id: id_from_def_id(def_id),
 687                 })
 688             }
 689             HirDef::PrimTy(..) |
 690             HirDef::SelfTy(..) |
 691             HirDef::Label(..) |
 692             HirDef::Macro(..) |
 693             HirDef::GlobalAsm(..) |
 694             HirDef::Err => None,
 695         }
 696     }
 697
 698     pub fn get_field_ref_data(&self,
 699                               field_ref: &ast::Field,
 700                               variant: &ty::VariantDef)
 701                               -> Option<Ref> {
 702         let f = variant.field_named(field_ref.ident.node.name);
 703         // We don't really need a sub-span here, but no harm done
 704         let sub_span = self.span_utils.span_for_last_ident(field_ref.ident.span);
 705         filter!(self.span_utils, sub_span, field_ref.ident.span, None);
 706         let span = self.span_from_span(sub_span.unwrap());
 707         Some(Ref {
 708             kind: RefKind::Variable,
 709             span,
 710             ref_id: id_from_def_id(f.did),
 711         })
 712     }
 713
 714     /// Attempt to return MacroRef for any AST node.
 715     ///
 716     /// For a given piece of AST defined by the supplied Span and NodeId,
 717     /// returns None if the node is not macro-generated or the span is malformed,
 718     /// else uses the expansion callsite and callee to return some MacroRef.
 719     pub fn get_macro_use_data(&self, span: Span) -> Option<MacroRef> {
 720         if !generated_code(span) {
 721             return None;
 722         }
 723         // Note we take care to use the source callsite/callee, to handle
 724         // nested expansions and ensure we only generate data for source-visible
 725         // macro uses.
 726         let callsite = span.source_callsite();
 727         let callsite_span = self.span_from_span(callsite);
 728         let callee = option_try!(span.source_callee());
 729         let callee_span = option_try!(callee.span);
 730
 731         // Ignore attribute macros, their spans are usually mangled
 732         if let MacroAttribute(_) = callee.format {
 733             return None;
 734         }
 735
 736         // If the callee is an imported macro from an external crate, need to get
 737         // the source span and name from the session, as their spans are localized
 738         // when read in, and no longer correspond to the source.
 739         if let Some(mac) = self.tcx.sess.imported_macro_spans.borrow().get(&callee_span) {
 740             let &(ref mac_name, mac_span) = mac;
 741             let mac_span = self.span_from_span(mac_span);
 742             return Some(MacroRef {
 743                 span: callsite_span,
 744                 qualname: mac_name.clone(), // FIXME: generate the real qualname
 745                 callee_span: mac_span,
 746             });
 747         }
 748
 749         let callee_span = self.span_from_span(callee_span);
 750         Some(MacroRef {
 751             span: callsite_span,
 752             qualname: callee.name().to_string(), // FIXME: generate the real qualname
 753             callee_span,
 754         })
 755     }
 756
 757     fn lookup_ref_id(&self, ref_id: NodeId) -> Option<DefId> {
 758         match self.get_path_def(ref_id) {
 759             HirDef::PrimTy(_) | HirDef::SelfTy(..) | HirDef::Err => None,
 760             def => Some(def.def_id()),
 761         }
 762     }
 763
 764     fn docs_for_attrs(&self, attrs: &[Attribute]) -> String {
 765         let mut result = String::new();
 766
 767         for attr in attrs {
 768             if attr.check_name("doc") {
 769                 if let Some(val) = attr.value_str() {
 770                     if attr.is_sugared_doc {
 771                         result.push_str(&strip_doc_comment_decoration(&val.as_str()));
 772                     } else {
 773                         result.push_str(&val.as_str());
 774                     }
 775                     result.push('\n');
 776                 }
 777             }
 778         }
 779
 780         if !self.config.full_docs {
 781             if let Some(index) = result.find("\n\n") {
 782                 result.truncate(index);
 783             }
 784         }
 785
 786         result
 787     }
 788 }
 789
 790 fn make_signature(decl: &ast::FnDecl, generics: &ast::Generics) -> String {
 791     let mut sig = "fn ".to_owned();
 792     if !generics.lifetimes.is_empty() || !generics.ty_params.is_empty() {
 793         sig.push('<');
 794         sig.push_str(&generics.lifetimes.iter()
 795                               .map(|l| l.lifetime.ident.name.to_string())
 796                               .collect::<Vec<_>>()
 797                               .join(", "));
 798         if !generics.lifetimes.is_empty() {
 799             sig.push_str(", ");
 800         }
 801         sig.push_str(&generics.ty_params.iter()
 802                               .map(|l| l.ident.to_string())
 803                               .collect::<Vec<_>>()
 804                               .join(", "));
 805         sig.push_str("> ");
 806     }
 807     sig.push('(');
 808     sig.push_str(&decl.inputs.iter().map(arg_to_string).collect::<Vec<_>>().join(", "));
 809     sig.push(')');
 810     match decl.output {
 811         ast::FunctionRetTy::Default(_) => sig.push_str(" -> ()"),
 812         ast::FunctionRetTy::Ty(ref t) => sig.push_str(&format!(" -> {}", ty_to_string(t))),
 813     }
 814
 815     sig
 816 }
 817
 818 // An AST visitor for collecting paths from patterns.
 819 struct PathCollector {
 820     // The Row field identifies the kind of pattern.
 821     collected_paths: Vec<(NodeId, ast::Path, ast::Mutability)>,
 822 }
 823
 824 impl PathCollector {
 825     fn new() -> PathCollector {
 826         PathCollector { collected_paths: vec![] }
 827     }
 828 }
 829
 830 impl<'a> Visitor<'a> for PathCollector {
 831     fn visit_pat(&mut self, p: &ast::Pat) {
 832         match p.node {
 833             PatKind::Struct(ref path, ..) => {
 834                 self.collected_paths.push((p.id, path.clone(),
 835                                            ast::Mutability::Mutable));
 836             }
 837             PatKind::TupleStruct(ref path, ..) |
 838             PatKind::Path(_, ref path) => {
 839                 self.collected_paths.push((p.id, path.clone(),
 840                                            ast::Mutability::Mutable));
 841             }
 842             PatKind::Ident(bm, ref path1, _) => {
 843                 debug!("PathCollector, visit ident in pat {}: {:?} {:?}",
 844                        path1.node,
 845                        p.span,
 846                        path1.span);
 847                 let immut = match bm {
 848                     // Even if the ref is mut, you can't change the ref, only
 849                     // the data pointed at, so showing the initialising expression
 850                     // is still worthwhile.
 851                     ast::BindingMode::ByRef(_) => ast::Mutability::Immutable,
 852                     ast::BindingMode::ByValue(mt) => mt,
 853                 };
 854                 // collect path for either visit_local or visit_arm
 855                 let path = ast::Path::from_ident(path1.span, path1.node);
 856                 self.collected_paths.push((p.id, path, immut));
 857             }
 858             _ => {}
 859         }
 860         visit::walk_pat(self, p);
 861     }
 862 }
 863
 864 /// Defines what to do with the results of saving the analysis.
 865 pub trait SaveHandler {
 866     fn save<'l, 'tcx>(&mut self,
 867                       save_ctxt: SaveContext<'l, 'tcx>,
 868                       krate: &ast::Crate,
 869                       cratename: &str);
 870 }
 871
 872 /// Dump the save-analysis results to a file.
 873 pub struct DumpHandler<'a> {
 874     odir: Option<&'a Path>,
 875     cratename: String
 876 }
 877
 878 impl<'a> DumpHandler<'a> {
 879     pub fn new(odir: Option<&'a Path>, cratename: &str) -> DumpHandler<'a> {
 880         DumpHandler {
 881             odir,
 882             cratename: cratename.to_owned()
 883         }
 884     }
 885
 886     fn output_file(&self, ctx: &SaveContext) -> File {
 887         let sess = &ctx.tcx.sess;
 888         let file_name = match ctx.config.output_file {
 889             Some(ref s) => PathBuf::from(s),
 890             None => {
 891                 let mut root_path = match self.odir {
 892                     Some(val) => val.join("save-analysis"),
 893                     None => PathBuf::from("save-analysis-temp"),
 894                 };
 895
 896                 if let Err(e) = std::fs::create_dir_all(&root_path) {
 897                     error!("Could not create directory {}: {}", root_path.display(), e);
 898                 }
 899
 900                 let executable =
 901                     sess.crate_types.borrow().iter().any(|ct| *ct == CrateTypeExecutable);
 902                 let mut out_name = if executable {
 903                     "".to_owned()
 904                 } else {
 905                     "lib".to_owned()
 906                 };
 907                 out_name.push_str(&self.cratename);
 908                 out_name.push_str(&sess.opts.cg.extra_filename);
 909                 out_name.push_str(".json");
 910                 root_path.push(&out_name);
 911
 912                 root_path
 913             }
 914         };
 915
 916         info!("Writing output to {}", file_name.display());
 917
 918         let output_file = File::create(&file_name).unwrap_or_else(|e| {
 919             sess.fatal(&format!("Could not open {}: {}", file_name.display(), e))
 920         });
 921
 922         output_file
 923     }
 924 }
 925
 926 impl<'a> SaveHandler for DumpHandler<'a> {
 927     fn save<'l, 'tcx>(&mut self,
 928                       save_ctxt: SaveContext<'l, 'tcx>,
 929                       krate: &ast::Crate,
 930                       cratename: &str) {
 931         let output = &mut self.output_file(&save_ctxt);
 932         let mut dumper = JsonDumper::new(output, save_ctxt.config.clone());
 933         let mut visitor = DumpVisitor::new(save_ctxt, &mut dumper);
 934
 935         visitor.dump_crate_info(cratename, krate);
 936         visit::walk_crate(&mut visitor, krate);
 937     }
 938 }
 939
 940 /// Call a callback with the results of save-analysis.
 941 pub struct CallbackHandler<'b> {
 942     pub callback: &'b mut FnMut(&rls_data::Analysis),
 943 }
 944
 945 impl<'b> SaveHandler for CallbackHandler<'b> {
 946     fn save<'l, 'tcx>(&mut self,
 947                       save_ctxt: SaveContext<'l, 'tcx>,
 948                       krate: &ast::Crate,
 949                       cratename: &str) {
 950         // We're using the JsonDumper here because it has the format of the
 951         // save-analysis results that we will pass to the callback. IOW, we are
 952         // using the JsonDumper to collect the save-analysis results, but not
 953         // actually to dump them to a file. This is all a bit convoluted and
 954         // there is certainly a simpler design here trying to get out (FIXME).
 955         let mut dumper = JsonDumper::with_callback(self.callback, save_ctxt.config.clone());
 956         let mut visitor = DumpVisitor::new(save_ctxt, &mut dumper);
 957
 958         visitor.dump_crate_info(cratename, krate);
 959         visit::walk_crate(&mut visitor, krate);
 960     }
 961 }
 962
 963 pub fn process_crate<'l, 'tcx, H: SaveHandler>(tcx: TyCtxt<'l, 'tcx, 'tcx>,
 964                                                krate: &ast::Crate,
 965                                                analysis: &'l ty::CrateAnalysis,
 966                                                cratename: &str,
 967                                                config: Option<Config>,
 968                                                mut handler: H) {
 969     let _ignore = tcx.dep_graph.in_ignore();
 970
 971     assert!(analysis.glob_map.is_some());
 972
 973     info!("Dumping crate {}", cratename);
 974
 975     let save_ctxt = SaveContext {
 976         tcx,
 977         tables: &ty::TypeckTables::empty(None),
 978         analysis,
 979         span_utils: SpanUtils::new(&tcx.sess),
 980         config: find_config(config),
 981     };
 982
 983     handler.save(save_ctxt, krate, cratename)
 984 }
 985
 986 fn find_config(supplied: Option<Config>) -> Config {
 987     if let Some(config) = supplied {
 988         return config;
 989     }
 990     match env::var_os("RUST_SAVE_ANALYSIS_CONFIG") {
 991         Some(config_string) => {
 992             rustc_serialize::json::decode(config_string.to_str().unwrap())
 993                 .expect("Could not deserialize save-analysis config")
 994         },
 995         None => Config::default(),
 996     }
 997 }
 998
 999 // Utility functions for the module.
1000
1001 // Helper function to escape quotes in a string
1002 fn escape(s: String) -> String {
1003     s.replace("\"", "\"\"")
1004 }
1005
1006 // Helper function to determine if a span came from a
1007 // macro expansion or syntax extension.
1008 fn generated_code(span: Span) -> bool {
1009     span.ctxt() != NO_EXPANSION || span == DUMMY_SP
1010 }
1011
1012 // DefId::index is a newtype and so the JSON serialisation is ugly. Therefore
1013 // we use our own Id which is the same, but without the newtype.
1014 fn id_from_def_id(id: DefId) -> rls_data::Id {
1015     rls_data::Id {
1016         krate: id.krate.as_u32(),
1017         index: id.index.as_u32(),
1018     }
1019 }
1020
1021 fn id_from_node_id(id: NodeId, scx: &SaveContext) -> rls_data::Id {
1022     let def_id = scx.tcx.hir.opt_local_def_id(id);
1023     def_id.map(|id| id_from_def_id(id)).unwrap_or_else(|| {
1024         // Create a *fake* `DefId` out of a `NodeId` by subtracting the `NodeId`
1025         // out of the maximum u32 value. This will work unless you have *billions*
1026         // of definitions in a single crate (very unlikely to actually happen).
1027         rls_data::Id {
1028             krate: LOCAL_CRATE.as_u32(),
1029             index: !id.as_u32(),
1030         }
1031     })
1032 }
1033
1034 fn null_id() -> rls_data::Id {
1035     rls_data::Id {
1036         krate: u32::max_value(),
1037         index: u32::max_value(),
1038     }
1039 }
1040
1041 fn lower_attributes(attrs: Vec<Attribute>, scx: &SaveContext) -> Vec<rls_data::Attribute> {
1042     attrs.into_iter()
1043     // Only retain real attributes. Doc comments are lowered separately.
1044     .filter(|attr| attr.path != "doc")
1045     .map(|mut attr| {
1046         // Remove the surrounding '#[..]' or '#![..]' of the pretty printed
1047         // attribute. First normalize all inner attribute (#![..]) to outer
1048         // ones (#[..]), then remove the two leading and the one trailing character.
1049         attr.style = ast::AttrStyle::Outer;
1050         let value = pprust::attribute_to_string(&attr);
1051         // This str slicing works correctly, because the leading and trailing characters
1052         // are in the ASCII range and thus exactly one byte each.
1053         let value = value[2..value.len()-1].to_string();
1054
1055         rls_data::Attribute {
1056             value,
1057             span: scx.span_from_span(attr.span),
1058         }
1059     }).collect()
1060 }