src/librustc_trans/save/mod.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 use middle::ty;
  12 use middle::def;
  13 use middle::def_id::DefId;
  14
  15 use std::env;
  16 use std::fs::{self, File};
  17 use std::path::{Path, PathBuf};
  18
  19 use rustc_front;
  20 use rustc::front::map::NodeItem;
  21 use rustc_front::{hir, lowering};
  22
  23 use syntax::ast::{self, NodeId};
  24 use syntax::ast_util;
  25 use syntax::codemap::*;
  26 use syntax::parse::token::{self, keywords};
  27 use syntax::visit::{self, Visitor};
  28 use syntax::print::pprust::ty_to_string;
  29
  30 use self::span_utils::SpanUtils;
  31
  32
  33 pub mod span_utils;
  34 pub mod recorder;
  35
  36 mod dump_csv;
  37
  38 pub struct SaveContext<'l, 'tcx: 'l> {
  39     tcx: &'l ty::ctxt<'tcx>,
  40     lcx: &'l lowering::LoweringContext<'l>,
  41     span_utils: SpanUtils<'l>,
  42 }
  43
  44 pub struct CrateData {
  45     pub name: String,
  46     pub number: u32,
  47 }
  48
  49 /// Data for any entity in the Rust language. The actual data contained varied
  50 /// with the kind of entity being queried. See the nested structs for details.
  51 #[derive(Debug)]
  52 pub enum Data {
  53     /// Data for all kinds of functions and methods.
  54     FunctionData(FunctionData),
  55     /// Data for local and global variables (consts and statics), and fields.
  56     VariableData(VariableData),
  57     /// Data for modules.
  58     ModData(ModData),
  59     /// Data for Enums.
  60     EnumData(EnumData),
  61     /// Data for impls.
  62     ImplData(ImplData),
  63
  64     /// Data for the use of some variable (e.g., the use of a local variable, which
  65     /// will refere to that variables declaration).
  66     VariableRefData(VariableRefData),
  67     /// Data for a reference to a type or trait.
  68     TypeRefData(TypeRefData),
  69     /// Data for a reference to a module.
  70     ModRefData(ModRefData),
  71     /// Data about a function call.
  72     FunctionCallData(FunctionCallData),
  73     /// Data about a method call.
  74     MethodCallData(MethodCallData),
  75 }
  76
  77 /// Data for all kinds of functions and methods.
  78 #[derive(Debug)]
  79 pub struct FunctionData {
  80     pub id: NodeId,
  81     pub name: String,
  82     pub qualname: String,
  83     pub declaration: Option<DefId>,
  84     pub span: Span,
  85     pub scope: NodeId,
  86 }
  87
  88 /// Data for local and global variables (consts and statics).
  89 #[derive(Debug)]
  90 pub struct VariableData {
  91     pub id: NodeId,
  92     pub name: String,
  93     pub qualname: String,
  94     pub span: Span,
  95     pub scope: NodeId,
  96     pub value: String,
  97     pub type_value: String,
  98 }
  99
 100 /// Data for modules.
 101 #[derive(Debug)]
 102 pub struct ModData {
 103     pub id: NodeId,
 104     pub name: String,
 105     pub qualname: String,
 106     pub span: Span,
 107     pub scope: NodeId,
 108     pub filename: String,
 109 }
 110
 111 /// Data for enum declarations.
 112 #[derive(Debug)]
 113 pub struct EnumData {
 114     pub id: NodeId,
 115     pub value: String,
 116     pub qualname: String,
 117     pub span: Span,
 118     pub scope: NodeId,
 119 }
 120
 121 #[derive(Debug)]
 122 pub struct ImplData {
 123     pub id: NodeId,
 124     pub span: Span,
 125     pub scope: NodeId,
 126     // FIXME: I'm not really sure inline data is the best way to do this. Seems
 127     // OK in this case, but generalising leads to returning chunks of AST, which
 128     // feels wrong.
 129     pub trait_ref: Option<TypeRefData>,
 130     pub self_ref: Option<TypeRefData>,
 131 }
 132
 133 /// Data for the use of some item (e.g., the use of a local variable, which
 134 /// will refer to that variables declaration (by ref_id)).
 135 #[derive(Debug)]
 136 pub struct VariableRefData {
 137     pub name: String,
 138     pub span: Span,
 139     pub scope: NodeId,
 140     pub ref_id: DefId,
 141 }
 142
 143 /// Data for a reference to a type or trait.
 144 #[derive(Debug)]
 145 pub struct TypeRefData {
 146     pub span: Span,
 147     pub scope: NodeId,
 148     pub ref_id: DefId,
 149 }
 150
 151 /// Data for a reference to a module.
 152 #[derive(Debug)]
 153 pub struct ModRefData {
 154     pub span: Span,
 155     pub scope: NodeId,
 156     pub ref_id: DefId,
 157 }
 158
 159 /// Data about a function call.
 160 #[derive(Debug)]
 161 pub struct FunctionCallData {
 162     pub span: Span,
 163     pub scope: NodeId,
 164     pub ref_id: DefId,
 165 }
 166
 167 /// Data about a method call.
 168 #[derive(Debug)]
 169 pub struct MethodCallData {
 170     pub span: Span,
 171     pub scope: NodeId,
 172     pub ref_id: Option<DefId>,
 173     pub decl_id: Option<DefId>,
 174 }
 175
 176
 177
 178 impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
 179     pub fn new(tcx: &'l ty::ctxt<'tcx>,
 180                lcx: &'l lowering::LoweringContext<'l>)
 181                -> SaveContext<'l, 'tcx> {
 182         let span_utils = SpanUtils::new(&tcx.sess);
 183         SaveContext::from_span_utils(tcx, lcx, span_utils)
 184     }
 185
 186     pub fn from_span_utils(tcx: &'l ty::ctxt<'tcx>,
 187                            lcx: &'l lowering::LoweringContext<'l>,
 188                            span_utils: SpanUtils<'l>)
 189                            -> SaveContext<'l, 'tcx> {
 190         SaveContext {
 191             tcx: tcx,
 192             lcx: lcx,
 193             span_utils: span_utils,
 194         }
 195     }
 196
 197     // List external crates used by the current crate.
 198     pub fn get_external_crates(&self) -> Vec<CrateData> {
 199         let mut result = Vec::new();
 200
 201         self.tcx.sess.cstore.iter_crate_data(|n, cmd| {
 202             result.push(CrateData {
 203                 name: cmd.name.clone(),
 204                 number: n,
 205             });
 206         });
 207
 208         result
 209     }
 210
 211     pub fn get_item_data(&self, item: &ast::Item) -> Data {
 212         match item.node {
 213             ast::ItemFn(..) => {
 214                 let name = self.tcx.map.path_to_string(item.id);
 215                 let qualname = format!("::{}", name);
 216                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Fn);
 217
 218                 Data::FunctionData(FunctionData {
 219                     id: item.id,
 220                     name: name,
 221                     qualname: qualname,
 222                     declaration: None,
 223                     span: sub_span.unwrap(),
 224                     scope: self.enclosing_scope(item.id),
 225                 })
 226             }
 227             ast::ItemStatic(ref typ, mt, ref expr) => {
 228                 let qualname = format!("::{}", self.tcx.map.path_to_string(item.id));
 229
 230                 // If the variable is immutable, save the initialising expression.
 231                 let (value, keyword) = match mt {
 232                     ast::MutMutable => (String::from("<mutable>"), keywords::Mut),
 233                     ast::MutImmutable => (self.span_utils.snippet(expr.span), keywords::Static),
 234                 };
 235
 236                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keyword);
 237
 238                 Data::VariableData(VariableData {
 239                     id: item.id,
 240                     name: item.ident.to_string(),
 241                     qualname: qualname,
 242                     span: sub_span.unwrap(),
 243                     scope: self.enclosing_scope(item.id),
 244                     value: value,
 245                     type_value: ty_to_string(&typ),
 246                 })
 247             }
 248             ast::ItemConst(ref typ, ref expr) => {
 249                 let qualname = format!("::{}", self.tcx.map.path_to_string(item.id));
 250                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Const);
 251
 252                 Data::VariableData(VariableData {
 253                     id: item.id,
 254                     name: item.ident.to_string(),
 255                     qualname: qualname,
 256                     span: sub_span.unwrap(),
 257                     scope: self.enclosing_scope(item.id),
 258                     value: self.span_utils.snippet(expr.span),
 259                     type_value: ty_to_string(&typ),
 260                 })
 261             }
 262             ast::ItemMod(ref m) => {
 263                 let qualname = format!("::{}", self.tcx.map.path_to_string(item.id));
 264
 265                 let cm = self.tcx.sess.codemap();
 266                 let filename = cm.span_to_filename(m.inner);
 267
 268                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Mod);
 269
 270                 Data::ModData(ModData {
 271                     id: item.id,
 272                     name: item.ident.to_string(),
 273                     qualname: qualname,
 274                     span: sub_span.unwrap(),
 275                     scope: self.enclosing_scope(item.id),
 276                     filename: filename,
 277                 })
 278             }
 279             ast::ItemEnum(..) => {
 280                 let enum_name = format!("::{}", self.tcx.map.path_to_string(item.id));
 281                 let val = self.span_utils.snippet(item.span);
 282                 let sub_span = self.span_utils.sub_span_after_keyword(item.span, keywords::Enum);
 283
 284                 Data::EnumData(EnumData {
 285                     id: item.id,
 286                     value: val,
 287                     span: sub_span.unwrap(),
 288                     qualname: enum_name,
 289                     scope: self.enclosing_scope(item.id),
 290                 })
 291             }
 292             ast::ItemImpl(_, _, _, ref trait_ref, ref typ, _) => {
 293                 let mut type_data = None;
 294                 let sub_span;
 295
 296                 let parent = self.enclosing_scope(item.id);
 297
 298                 match typ.node {
 299                     // Common case impl for a struct or something basic.
 300                     ast::TyPath(None, ref path) => {
 301                         sub_span = self.span_utils.sub_span_for_type_name(path.span).unwrap();
 302                         type_data = self.lookup_ref_id(typ.id).map(|id| {
 303                             TypeRefData {
 304                                 span: sub_span,
 305                                 scope: parent,
 306                                 ref_id: id,
 307                             }
 308                         });
 309                     }
 310                     _ => {
 311                         // Less useful case, impl for a compound type.
 312                         let span = typ.span;
 313                         sub_span = self.span_utils.sub_span_for_type_name(span).unwrap_or(span);
 314                     }
 315                 }
 316
 317                 let trait_data = trait_ref.as_ref()
 318                                           .and_then(|tr| self.get_trait_ref_data(tr, parent));
 319
 320                 Data::ImplData(ImplData {
 321                     id: item.id,
 322                     span: sub_span,
 323                     scope: parent,
 324                     trait_ref: trait_data,
 325                     self_ref: type_data,
 326                 })
 327             }
 328             _ => {
 329                 // FIXME
 330                 unimplemented!();
 331             }
 332         }
 333     }
 334
 335     pub fn get_field_data(&self, field: &ast::StructField, scope: NodeId) -> Option<VariableData> {
 336         match field.node.kind {
 337             ast::NamedField(ident, _) => {
 338                 let qualname = format!("::{}::{}", self.tcx.map.path_to_string(scope), ident);
 339                 let typ = self.tcx.node_types().get(&field.node.id).unwrap().to_string();
 340                 let sub_span = self.span_utils.sub_span_before_token(field.span, token::Colon);
 341                 Some(VariableData {
 342                     id: field.node.id,
 343                     name: ident.to_string(),
 344                     qualname: qualname,
 345                     span: sub_span.unwrap(),
 346                     scope: scope,
 347                     value: "".to_owned(),
 348                     type_value: typ,
 349                 })
 350             }
 351             _ => None,
 352         }
 353     }
 354
 355     // FIXME would be nice to take a MethodItem here, but the ast provides both
 356     // trait and impl flavours, so the caller must do the disassembly.
 357     pub fn get_method_data(&self, id: ast::NodeId, name: ast::Name, span: Span) -> FunctionData {
 358         // The qualname for a method is the trait name or name of the struct in an impl in
 359         // which the method is declared in, followed by the method's name.
 360         let qualname = match self.tcx.impl_of_method(self.tcx.map.local_def_id(id)) {
 361             Some(impl_id) => match self.tcx.map.get_if_local(impl_id) {
 362                 Some(NodeItem(item)) => {
 363                     match item.node {
 364                         hir::ItemImpl(_, _, _, _, ref ty, _) => {
 365                             let mut result = String::from("<");
 366                             result.push_str(&rustc_front::print::pprust::ty_to_string(&**ty));
 367
 368                             match self.tcx.trait_of_item(self.tcx.map.local_def_id(id)) {
 369                                 Some(def_id) => {
 370                                     result.push_str(" as ");
 371                                     result.push_str(&self.tcx.item_path_str(def_id));
 372                                 }
 373                                 None => {}
 374                             }
 375                             result.push_str(">");
 376                             result
 377                         }
 378                         _ => {
 379                             self.tcx.sess.span_bug(span,
 380                                                    &format!("Container {:?} for method {} not \
 381                                                              an impl?",
 382                                                             impl_id,
 383                                                             id));
 384                         }
 385                     }
 386                 }
 387                 r => {
 388                     self.tcx.sess.span_bug(span,
 389                                            &format!("Container {:?} for method {} is not a node \
 390                                                      item {:?}",
 391                                                     impl_id,
 392                                                     id,
 393                                                     r));
 394                 }
 395             },
 396             None => match self.tcx.trait_of_item(self.tcx.map.local_def_id(id)) {
 397                 Some(def_id) => {
 398                     match self.tcx.map.get_if_local(def_id) {
 399                         Some(NodeItem(_)) => {
 400                             format!("::{}", self.tcx.item_path_str(def_id))
 401                         }
 402                         r => {
 403                             self.tcx.sess.span_bug(span,
 404                                                    &format!("Could not find container {:?} for \
 405                                                              method {}, got {:?}",
 406                                                             def_id,
 407                                                             id,
 408                                                             r));
 409                         }
 410                     }
 411                 }
 412                 None => {
 413                     self.tcx.sess.span_bug(span,
 414                                            &format!("Could not find container for method {}", id));
 415                 }
 416             },
 417         };
 418
 419         let qualname = format!("{}::{}", qualname, name);
 420
 421         let def_id = self.tcx.map.local_def_id(id);
 422         let decl_id = self.tcx.trait_item_of_item(def_id).and_then(|new_id| {
 423             let new_def_id = new_id.def_id();
 424             if new_def_id != def_id {
 425                 Some(new_def_id)
 426             } else {
 427                 None
 428             }
 429         });
 430
 431         let sub_span = self.span_utils.sub_span_after_keyword(span, keywords::Fn);
 432
 433         FunctionData {
 434             id: id,
 435             name: name.to_string(),
 436             qualname: qualname,
 437             declaration: decl_id,
 438             span: sub_span.unwrap(),
 439             scope: self.enclosing_scope(id),
 440         }
 441     }
 442
 443     pub fn get_trait_ref_data(&self,
 444                               trait_ref: &ast::TraitRef,
 445                               parent: NodeId)
 446                               -> Option<TypeRefData> {
 447         self.lookup_ref_id(trait_ref.ref_id).map(|def_id| {
 448             let span = trait_ref.path.span;
 449             let sub_span = self.span_utils.sub_span_for_type_name(span).unwrap_or(span);
 450             TypeRefData {
 451                 span: sub_span,
 452                 scope: parent,
 453                 ref_id: def_id,
 454             }
 455         })
 456     }
 457
 458     pub fn get_expr_data(&self, expr: &ast::Expr) -> Option<Data> {
 459         match expr.node {
 460             ast::ExprField(ref sub_ex, ident) => {
 461                 let hir_node = lowering::lower_expr(self.lcx, sub_ex);
 462                 let ty = &self.tcx.expr_ty_adjusted(&hir_node).sty;
 463                 match *ty {
 464                     ty::TyStruct(def, _) => {
 465                         let f = def.struct_variant().field_named(ident.node.name);
 466                         let sub_span = self.span_utils.span_for_last_ident(expr.span);
 467                         return Some(Data::VariableRefData(VariableRefData {
 468                             name: ident.node.to_string(),
 469                             span: sub_span.unwrap(),
 470                             scope: self.enclosing_scope(expr.id),
 471                             ref_id: f.did,
 472                         }));
 473                     }
 474                     _ => {
 475                         debug!("Expected struct type, found {:?}", ty);
 476                         None
 477                     }
 478                 }
 479             }
 480             ast::ExprStruct(ref path, _, _) => {
 481                 let hir_node = lowering::lower_expr(self.lcx, expr);
 482                 let ty = &self.tcx.expr_ty_adjusted(&hir_node).sty;
 483                 match *ty {
 484                     ty::TyStruct(def, _) => {
 485                         let sub_span = self.span_utils.span_for_last_ident(path.span);
 486                         Some(Data::TypeRefData(TypeRefData {
 487                             span: sub_span.unwrap(),
 488                             scope: self.enclosing_scope(expr.id),
 489                             ref_id: def.did,
 490                         }))
 491                     }
 492                     _ => {
 493                         // FIXME ty could legitimately be a TyEnum, but then we will fail
 494                         // later if we try to look up the fields.
 495                         debug!("expected TyStruct, found {:?}", ty);
 496                         None
 497                     }
 498                 }
 499             }
 500             ast::ExprMethodCall(..) => {
 501                 let method_call = ty::MethodCall::expr(expr.id);
 502                 let method_id = self.tcx.tables.borrow().method_map[&method_call].def_id;
 503                 let (def_id, decl_id) = match self.tcx.impl_or_trait_item(method_id).container() {
 504                     ty::ImplContainer(_) => (Some(method_id), None),
 505                     ty::TraitContainer(_) => (None, Some(method_id)),
 506                 };
 507                 let sub_span = self.span_utils.sub_span_for_meth_name(expr.span);
 508                 let parent = self.enclosing_scope(expr.id);
 509                 Some(Data::MethodCallData(MethodCallData {
 510                     span: sub_span.unwrap(),
 511                     scope: parent,
 512                     ref_id: def_id,
 513                     decl_id: decl_id,
 514                 }))
 515             }
 516             ast::ExprPath(_, ref path) => {
 517                 self.get_path_data(expr.id, path)
 518             }
 519             _ => {
 520                 // FIXME
 521                 unimplemented!();
 522             }
 523         }
 524     }
 525
 526     pub fn get_path_data(&self, id: NodeId, path: &ast::Path) -> Option<Data> {
 527         let def_map = self.tcx.def_map.borrow();
 528         if !def_map.contains_key(&id) {
 529             self.tcx.sess.span_bug(path.span,
 530                                    &format!("def_map has no key for {} in visit_expr", id));
 531         }
 532         let def = def_map.get(&id).unwrap().full_def();
 533         let sub_span = self.span_utils.span_for_last_ident(path.span);
 534         match def {
 535             def::DefUpvar(..) |
 536             def::DefLocal(..) |
 537             def::DefStatic(..) |
 538             def::DefConst(..) |
 539             def::DefAssociatedConst(..) |
 540             def::DefVariant(..) => {
 541                 Some(Data::VariableRefData(VariableRefData {
 542                     name: self.span_utils.snippet(sub_span.unwrap()),
 543                     span: sub_span.unwrap(),
 544                     scope: self.enclosing_scope(id),
 545                     ref_id: def.def_id(),
 546                 }))
 547             }
 548             def::DefStruct(def_id) |
 549             def::DefTy(def_id, _) |
 550             def::DefTrait(def_id) |
 551             def::DefTyParam(_, _, def_id, _) => {
 552                 Some(Data::TypeRefData(TypeRefData {
 553                     span: sub_span.unwrap(),
 554                     ref_id: def_id,
 555                     scope: self.enclosing_scope(id),
 556                 }))
 557             }
 558             def::DefMethod(decl_id) => {
 559                 let sub_span = self.span_utils.sub_span_for_meth_name(path.span);
 560                 let def_id = if decl_id.is_local() {
 561                     let ti = self.tcx.impl_or_trait_item(decl_id);
 562                     match ti.container() {
 563                         ty::TraitContainer(def_id) => {
 564                             self.tcx
 565                                 .trait_items(def_id)
 566                                 .iter()
 567                                 .find(|mr| mr.name() == ti.name() && self.trait_method_has_body(mr))
 568                                 .map(|mr| mr.def_id())
 569                         }
 570                         ty::ImplContainer(def_id) => {
 571                             let impl_items = self.tcx.impl_items.borrow();
 572                             Some(impl_items.get(&def_id)
 573                                            .unwrap()
 574                                            .iter()
 575                                            .find(|mr| {
 576                                                self.tcx.impl_or_trait_item(mr.def_id()).name() ==
 577                                                ti.name()
 578                                            })
 579                                            .unwrap()
 580                                            .def_id())
 581                         }
 582                     }
 583                 } else {
 584                     None
 585                 };
 586                 Some(Data::MethodCallData(MethodCallData {
 587                     span: sub_span.unwrap(),
 588                     scope: self.enclosing_scope(id),
 589                     ref_id: def_id,
 590                     decl_id: Some(decl_id),
 591                 }))
 592             }
 593             def::DefFn(def_id, _) => {
 594                 Some(Data::FunctionCallData(FunctionCallData {
 595                     ref_id: def_id,
 596                     span: sub_span.unwrap(),
 597                     scope: self.enclosing_scope(id),
 598                 }))
 599             }
 600             def::DefMod(def_id) => {
 601                 Some(Data::ModRefData(ModRefData {
 602                     ref_id: def_id,
 603                     span: sub_span.unwrap(),
 604                     scope: self.enclosing_scope(id),
 605                 }))
 606             }
 607             _ => None,
 608         }
 609     }
 610
 611     fn trait_method_has_body(&self, mr: &ty::ImplOrTraitItem) -> bool {
 612         let def_id = mr.def_id();
 613         if let Some(node_id) = self.tcx.map.as_local_node_id(def_id) {
 614             let trait_item = self.tcx.map.expect_trait_item(node_id);
 615             if let hir::TraitItem_::MethodTraitItem(_, Some(_)) = trait_item.node {
 616                 true
 617             } else {
 618                 false
 619             }
 620         } else {
 621             false
 622         }
 623     }
 624
 625     pub fn get_field_ref_data(&self,
 626                               field_ref: &ast::Field,
 627                               variant: ty::VariantDef,
 628                               parent: NodeId)
 629                               -> VariableRefData {
 630         let f = variant.field_named(field_ref.ident.node.name);
 631         // We don't really need a sub-span here, but no harm done
 632         let sub_span = self.span_utils.span_for_last_ident(field_ref.ident.span);
 633         VariableRefData {
 634             name: field_ref.ident.node.to_string(),
 635             span: sub_span.unwrap(),
 636             scope: parent,
 637             ref_id: f.did,
 638         }
 639     }
 640
 641     pub fn get_data_for_id(&self, _id: &NodeId) -> Data {
 642         // FIXME
 643         unimplemented!();
 644     }
 645
 646     fn lookup_ref_id(&self, ref_id: NodeId) -> Option<DefId> {
 647         if !self.tcx.def_map.borrow().contains_key(&ref_id) {
 648             self.tcx.sess.bug(&format!("def_map has no key for {} in lookup_type_ref",
 649                                        ref_id));
 650         }
 651         let def = self.tcx.def_map.borrow().get(&ref_id).unwrap().full_def();
 652         match def {
 653             def::DefPrimTy(_) | def::DefSelfTy(..) => None,
 654             _ => Some(def.def_id()),
 655         }
 656     }
 657
 658     #[inline]
 659     pub fn enclosing_scope(&self, id: NodeId) -> NodeId {
 660         self.tcx.map.get_enclosing_scope(id).unwrap_or(0)
 661     }
 662 }
 663
 664 // An AST visitor for collecting paths from patterns.
 665 struct PathCollector {
 666     // The Row field identifies the kind of pattern.
 667     collected_paths: Vec<(NodeId, ast::Path, ast::Mutability, recorder::Row)>,
 668 }
 669
 670 impl PathCollector {
 671     fn new() -> PathCollector {
 672         PathCollector { collected_paths: vec![] }
 673     }
 674 }
 675
 676 impl<'v> Visitor<'v> for PathCollector {
 677     fn visit_pat(&mut self, p: &ast::Pat) {
 678         if generated_code(p.span) {
 679             return;
 680         }
 681
 682         match p.node {
 683             ast::PatStruct(ref path, _, _) => {
 684                 self.collected_paths.push((p.id, path.clone(), ast::MutMutable, recorder::TypeRef));
 685             }
 686             ast::PatEnum(ref path, _) |
 687             ast::PatQPath(_, ref path) => {
 688                 self.collected_paths.push((p.id, path.clone(), ast::MutMutable, recorder::VarRef));
 689             }
 690             ast::PatIdent(bm, ref path1, _) => {
 691                 debug!("PathCollector, visit ident in pat {}: {:?} {:?}",
 692                        path1.node,
 693                        p.span,
 694                        path1.span);
 695                 let immut = match bm {
 696                     // Even if the ref is mut, you can't change the ref, only
 697                     // the data pointed at, so showing the initialising expression
 698                     // is still worthwhile.
 699                     ast::BindByRef(_) => ast::MutImmutable,
 700                     ast::BindByValue(mt) => mt,
 701                 };
 702                 // collect path for either visit_local or visit_arm
 703                 let path = ast_util::ident_to_path(path1.span, path1.node);
 704                 self.collected_paths.push((p.id, path, immut, recorder::VarRef));
 705             }
 706             _ => {}
 707         }
 708         visit::walk_pat(self, p);
 709     }
 710 }
 711
 712 pub fn process_crate<'l, 'tcx>(tcx: &'l ty::ctxt<'tcx>,
 713                                lcx: &'l lowering::LoweringContext<'l>,
 714                                krate: &ast::Crate,
 715                                analysis: &ty::CrateAnalysis,
 716                                cratename: &str,
 717                                odir: Option<&Path>) {
 718     if generated_code(krate.span) {
 719         return;
 720     }
 721
 722     assert!(analysis.glob_map.is_some());
 723
 724     info!("Dumping crate {}", cratename);
 725
 726     // find a path to dump our data to
 727     let mut root_path = match env::var_os("DXR_RUST_TEMP_FOLDER") {
 728         Some(val) => PathBuf::from(val),
 729         None => match odir {
 730             Some(val) => val.join("dxr"),
 731             None => PathBuf::from("dxr-temp"),
 732         },
 733     };
 734
 735     if let Err(e) = fs::create_dir_all(&root_path) {
 736         tcx.sess.err(&format!("Could not create directory {}: {}",
 737                               root_path.display(),
 738                               e));
 739     }
 740
 741     {
 742         let disp = root_path.display();
 743         info!("Writing output to {}", disp);
 744     }
 745
 746     // Create output file.
 747     let mut out_name = cratename.to_owned();
 748     out_name.push_str(".csv");
 749     root_path.push(&out_name);
 750     let output_file = match File::create(&root_path) {
 751         Ok(f) => box f,
 752         Err(e) => {
 753             let disp = root_path.display();
 754             tcx.sess.fatal(&format!("Could not open {}: {}", disp, e));
 755         }
 756     };
 757     root_path.pop();
 758
 759     let mut visitor = dump_csv::DumpCsvVisitor::new(tcx, lcx, analysis, output_file);
 760
 761     visitor.dump_crate_info(cratename, krate);
 762     visit::walk_crate(&mut visitor, krate);
 763 }
 764
 765 // Utility functions for the module.
 766
 767 // Helper function to escape quotes in a string
 768 fn escape(s: String) -> String {
 769     s.replace("\"", "\"\"")
 770 }
 771
 772 // If the expression is a macro expansion or other generated code, run screaming
 773 // and don't index.
 774 pub fn generated_code(span: Span) -> bool {
 775     span.expn_id != NO_EXPANSION || span == DUMMY_SP
 776 }