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