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.
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.
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)]
16 #![allow(unused_attributes)]
18 #![recursion_limit="256"]
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;
32 extern crate syntax_pos;
34 extern crate rls_data;
35 extern crate rls_span;
45 use rustc::hir::def::Def as HirDef;
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};
55 use std::default::Default;
58 use std::path::{Path, PathBuf};
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;
69 use json_dumper::JsonDumper;
70 use dump_visitor::DumpVisitor;
71 use span_utils::SpanUtils;
73 use rls_data::{Def, DefKind, ExternalCrateData, GlobalCrateId, MacroRef, Ref, RefKind, Relation,
74 RelationKind, SpanData, Impl, ImplKind};
75 use rls_data::config::Config;
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>,
84 impl_counter: Cell<u32>,
91 RelationData(Relation, Impl),
94 impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
95 fn span_from_span(&self, span: Span) -> SpanData {
96 use rls_span::{Column, Row};
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());
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),
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);
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)
125 // Otherwise it's only a DepInfo, in which case we return early and
126 // not even reach the analysis stage.
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());
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,
139 debug!("Skipping crate {}, no data", n);
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),
150 name: self.tcx.crate_name(n).to_string(),
151 disambiguator: self.tcx.crate_disambiguator(n).to_fingerprint().as_value(),
159 pub fn get_extern_item_data(&self, item: &ast::ForeignItem) -> Option<Data> {
160 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
162 ast::ForeignItemKind::Fn(ref decl, ref generics) => {
163 filter!(self.span_utils, item.ident.span);
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(),
171 value: make_signature(decl, generics),
175 docs: self.docs_for_attrs(&item.attrs),
176 sig: sig::foreign_item_signature(item, self),
177 attributes: lower_attributes(item.attrs.clone(), self),
180 ast::ForeignItemKind::Static(ref ty, _) => {
181 filter!(self.span_utils, item.ident.span);
183 let id = ::id_from_node_id(item.id, self);
184 let span = self.span_from_span(item.ident.span);
186 Some(Data::DefData(Def {
187 kind: DefKind::ForeignStatic,
190 name: item.ident.to_string(),
192 value: ty_to_string(ty),
196 docs: self.docs_for_attrs(&item.attrs),
197 sig: sig::foreign_item_signature(item, self),
198 attributes: lower_attributes(item.attrs.clone(), self),
201 // FIXME(plietar): needs a new DefKind in rls-data
202 ast::ForeignItemKind::Ty => None,
203 ast::ForeignItemKind::Macro(..) => None,
207 pub fn get_item_data(&self, item: &ast::Item) -> Option<Data> {
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(),
218 value: make_signature(decl, generics),
222 docs: self.docs_for_attrs(&item.attrs),
223 sig: sig::item_signature(item, self),
224 attributes: lower_attributes(item.attrs.clone(), self),
227 ast::ItemKind::Static(ref typ, ..) => {
228 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
230 filter!(self.span_utils, item.ident.span);
232 let id = id_from_node_id(item.id, self);
233 let span = self.span_from_span(item.ident.span);
235 Some(Data::DefData(Def {
236 kind: DefKind::Static,
239 name: item.ident.to_string(),
241 value: ty_to_string(&typ),
245 docs: self.docs_for_attrs(&item.attrs),
246 sig: sig::item_signature(item, self),
247 attributes: lower_attributes(item.attrs.clone(), self),
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);
254 let id = id_from_node_id(item.id, self);
255 let span = self.span_from_span(item.ident.span);
257 Some(Data::DefData(Def {
258 kind: DefKind::Const,
261 name: item.ident.to_string(),
263 value: ty_to_string(typ),
267 docs: self.docs_for_attrs(&item.attrs),
268 sig: sig::item_signature(item, self),
269 attributes: lower_attributes(item.attrs.clone(), self),
272 ast::ItemKind::Mod(ref m) => {
273 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
275 let cm = self.tcx.sess.source_map();
276 let filename = cm.span_to_filename(m.inner);
278 filter!(self.span_utils, item.ident.span);
280 Some(Data::DefData(Def {
282 id: id_from_node_id(item.id, self),
283 name: item.ident.to_string(),
285 span: self.span_from_span(item.ident.span),
286 value: filename.to_string(),
290 .map(|i| id_from_node_id(i.id, self))
293 docs: self.docs_for_attrs(&item.attrs),
294 sig: sig::item_signature(item, self),
295 attributes: lower_attributes(item.attrs.clone(), self),
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
304 .map(|v| v.node.ident.to_string())
307 let value = format!("{}::{{{}}}", name, variants_str);
308 Some(Data::DefData(Def {
310 id: id_from_node_id(item.id, self),
311 span: self.span_from_span(item.ident.span),
316 children: def.variants
318 .map(|v| id_from_node_id(v.node.data.id(), self))
321 docs: self.docs_for_attrs(&item.attrs),
322 sig: sig::item_signature(item, self),
323 attributes: lower_attributes(item.attrs.clone(), self),
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) {
332 let sub_span = path.segments.last().unwrap().ident.span;
333 filter!(self.span_utils, sub_span);
335 let impl_id = self.next_impl_id();
336 let span = self.span_from_span(sub_span);
338 let type_data = self.lookup_ref_id(typ.id);
339 type_data.map(|type_data| {
340 Data::RelationData(Relation {
341 kind: RelationKind::Impl {
345 from: id_from_def_id(type_data),
348 .and_then(|t| self.lookup_ref_id(t.ref_id))
350 .unwrap_or_else(|| null_id()),
354 kind: match *trait_ref {
355 Some(_) => ImplKind::Direct,
356 None => ImplKind::Inherent,
359 value: String::new(),
363 .map(|i| id_from_node_id(i.id, self))
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();
390 let id = id_from_node_id(field.id, self);
391 let span = self.span_from_span(ident.span);
394 kind: DefKind::Field,
400 parent: Some(id_from_node_id(scope, self)),
403 docs: self.docs_for_attrs(&field.attrs),
404 sig: sig::field_signature(field, self),
405 attributes: lower_attributes(field.attrs.clone(), self),
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));
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();
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));
439 .associated_items(def_id)
440 .find(|item| item.ident.name == ident.name)
441 .map(|item| decl_id = Some(item.def_id));
443 qualname.push_str(">");
445 (qualname, trait_id, decl_id, docs, attrs)
450 "Container {:?} for method {} not an impl?",
459 "Container {:?} for method {} is not a node item {:?}",
466 None => match self.tcx.trait_of_item(self.tcx.hir.local_def_id(id)) {
468 let mut docs = String::new();
469 let mut attrs = vec![];
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();
477 format!("::{}", self.tcx.item_path_str(def_id)),
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.
493 let qualname = format!("{}::{}", qualname, ident.name);
495 filter!(self.span_utils, ident.span);
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(),
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)),
507 decl_id: decl_id.map(|id| id_from_def_id(id)),
510 attributes: lower_attributes(attributes, self),
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) {
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);
526 ref_id: id_from_def_id(def_id),
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 {
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,
543 "Missing or weird node for sub-expression {} in {:?}",
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,
559 ref_id: id_from_def_id(variant.fields[index].did),
562 ty::Tuple(..) => None,
564 debug!("Expected struct or union type, found {:?}", ty);
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 {
578 ref_id: id_from_def_id(def.did),
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);
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(),
594 debug!("Could not resolve method id for {:?}", expr);
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)),
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,
610 .map(|id| id_from_def_id(id))
611 .unwrap_or_else(|| null_id()),
614 ast::ExprKind::Path(_, ref path) => {
615 self.get_path_data(expr.id, path).map(|d| Data::RefData(d))
624 pub fn get_path_def(&self, id: NodeId) -> HirDef {
625 match self.tcx.hir.get(id) {
626 Node::TraitRef(tr) => tr.path.def,
628 Node::Item(&hir::Item {
629 node: hir::ItemKind::Use(ref path, _),
632 Node::Visibility(&Spanned {
633 node: hir::VisibilityKind::Restricted { ref path, .. }, .. }) => path.def,
635 Node::Expr(&hir::Expr {
636 node: hir::ExprKind::Struct(ref qpath, ..),
639 Node::Expr(&hir::Expr {
640 node: hir::ExprKind::Path(ref qpath),
643 Node::Pat(&hir::Pat {
644 node: hir::PatKind::Path(ref qpath),
647 Node::Pat(&hir::Pat {
648 node: hir::PatKind::Struct(ref qpath, ..),
651 Node::Pat(&hir::Pat {
652 node: hir::PatKind::TupleStruct(ref qpath, ..),
655 let hir_id = self.tcx.hir.node_to_hir_id(id);
656 self.tables.qpath_def(qpath, hir_id)
659 Node::Binding(&hir::Pat {
660 node: hir::PatKind::Binding(_, canonical_id, ..),
662 }) => HirDef::Local(canonical_id),
664 Node::Ty(ty) => if let hir::Ty {
665 node: hir::TyKind::Path(ref 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);
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 {
693 if let Some(ref generic_args) = path.segments[0].args {
694 if let ast::GenericArgs::Parenthesized(_) = **generic_args {
701 if path.segments.is_empty() {
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);
710 HirDef::Upvar(id, ..) | HirDef::Local(id) => {
711 let span = self.span_from_span(sub_span);
713 kind: RefKind::Variable,
715 ref_id: id_from_node_id(id, self),
720 HirDef::AssociatedConst(..) |
721 HirDef::VariantCtor(..) => {
722 let span = self.span_from_span(sub_span);
724 kind: RefKind::Variable,
726 ref_id: id_from_def_id(def.def_id()),
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;
735 span: self.span_from_span(fn_span),
736 ref_id: id_from_def_id(def_id),
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);
755 ref_id: id_from_def_id(def_id),
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();
767 ref_id: id_from_def_id(parent_def_id),
770 HirDef::Method(decl_id) => {
771 let def_id = if decl_id.is_local() {
772 let ti = self.tcx.associated_item(decl_id);
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)
781 let span = self.span_from_span(sub_span);
783 kind: RefKind::Function,
785 ref_id: id_from_def_id(def_id.unwrap_or(decl_id)),
788 HirDef::Fn(def_id) => {
789 let span = self.span_from_span(sub_span);
791 kind: RefKind::Function,
793 ref_id: id_from_def_id(def_id),
796 HirDef::Mod(def_id) => {
797 let span = self.span_from_span(sub_span);
801 ref_id: id_from_def_id(def_id),
809 HirDef::NonMacroAttr(..) |
810 HirDef::SelfCtor(..) |
815 pub fn get_field_ref_data(
817 field_ref: &ast::Field,
818 variant: &ty::VariantDef,
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);
824 kind: RefKind::Variable,
826 ref_id: id_from_def_id(variant.fields[index].did),
830 /// Attempt to return MacroRef for any AST node.
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) {
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
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?;
847 // Ignore attribute macros, their spans are usually mangled
848 if let MacroAttribute(_) = callee.format {
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
857 .imported_macro_spans
861 let &(ref mac_name, mac_span) = mac;
862 let mac_span = self.span_from_span(mac_span);
863 return Some(MacroRef {
865 qualname: mac_name.clone(), // FIXME: generate the real qualname
866 callee_span: mac_span,
870 let callee_span = self.span_from_span(callee_span);
873 qualname: callee.format.name().to_string(), // FIXME: generate the real qualname
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()),
885 fn docs_for_attrs(&self, attrs: &[Attribute]) -> String {
886 let mut result = String::new();
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()));
894 result.push_str(&val.as_str());
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()))
902 .filter(|meta| meta.check_name("contents"))
903 .filter_map(|meta| meta.value_str())
905 result.push_str(&val.as_str());
912 if !self.config.full_docs {
913 if let Some(index) = result.find("\n\n") {
914 result.truncate(index);
921 fn next_impl_id(&self) -> u32 {
922 let next = self.impl_counter.get();
923 self.impl_counter.set(next + 1);
928 fn make_signature(decl: &ast::FnDecl, generics: &ast::Generics) -> String {
929 let mut sig = "fn ".to_owned();
930 if !generics.params.is_empty() {
932 sig.push_str(&generics
935 .map(|param| param.ident.to_string())
941 sig.push_str(&decl.inputs
948 ast::FunctionRetTy::Default(_) => sig.push_str(" -> ()"),
949 ast::FunctionRetTy::Ty(ref t) => sig.push_str(&format!(" -> {}", ty_to_string(t))),
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)>,
962 impl<'l> PathCollector<'l> {
963 fn new() -> PathCollector<'l> {
965 collected_paths: vec![],
966 collected_idents: vec![],
971 impl<'l, 'a: 'l> Visitor<'a> for PathCollector<'l> {
972 fn visit_pat(&mut self, p: &'a ast::Pat) {
974 PatKind::Struct(ref path, ..) => {
975 self.collected_paths.push((p.id, path));
977 PatKind::TupleStruct(ref path, ..) | PatKind::Path(_, ref path) => {
978 self.collected_paths.push((p.id, path));
980 PatKind::Ident(bm, ident, _) => {
982 "PathCollector, visit ident in pat {}: {:?} {:?}",
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,
994 self.collected_idents
995 .push((p.id, ident, immut));
999 visit::walk_pat(self, p);
1003 /// Defines what to do with the results of saving the analysis.
1004 pub trait SaveHandler {
1007 save_ctxt: SaveContext<'l, 'tcx>,
1014 /// Dump the save-analysis results to a file.
1015 pub struct DumpHandler<'a> {
1016 odir: Option<&'a Path>,
1020 impl<'a> DumpHandler<'a> {
1021 pub fn new(odir: Option<&'a Path>, cratename: &str) -> DumpHandler<'a> {
1024 cratename: cratename.to_owned(),
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),
1033 let mut root_path = match self.odir {
1034 Some(val) => val.join("save-analysis"),
1035 None => PathBuf::from("save-analysis-temp"),
1038 if let Err(e) = std::fs::create_dir_all(&root_path) {
1039 error!("Could not create directory {}: {}", root_path.display(), e);
1042 let executable = sess.crate_types
1045 .any(|ct| *ct == CrateType::Executable);
1046 let mut out_name = if executable {
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);
1060 info!("Writing output to {}", file_name.display());
1062 let output_file = File::create(&file_name).unwrap_or_else(
1063 |e| sess.fatal(&format!("Could not open {}: {}", file_name.display(), e)),
1070 impl<'a> SaveHandler for DumpHandler<'a> {
1073 save_ctxt: SaveContext<'l, 'tcx>,
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);
1082 visitor.dump_crate_info(cratename, krate);
1083 visitor.dump_compilation_options(input, cratename);
1084 visit::walk_crate(&mut visitor, krate);
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),
1093 impl<'b> SaveHandler for CallbackHandler<'b> {
1096 save_ctxt: SaveContext<'l, 'tcx>,
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);
1109 visitor.dump_crate_info(cratename, krate);
1110 visitor.dump_compilation_options(input, cratename);
1111 visit::walk_crate(&mut visitor, krate);
1115 pub fn process_crate<'l, 'tcx, H: SaveHandler>(
1116 tcx: TyCtxt<'l, 'tcx, 'tcx>,
1118 analysis: &'l ty::CrateAnalysis,
1121 config: Option<Config>,
1124 tcx.dep_graph.with_ignore(|| {
1125 assert!(analysis.glob_map.is_some());
1127 info!("Dumping crate {}", cratename);
1129 let save_ctxt = SaveContext {
1131 tables: &ty::TypeckTables::empty(None),
1133 span_utils: SpanUtils::new(&tcx.sess),
1134 config: find_config(config),
1135 impl_counter: Cell::new(0),
1138 handler.save(save_ctxt, krate, cratename, input)
1142 fn find_config(supplied: Option<Config>) -> Config {
1143 if let Some(config) = supplied {
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(),
1153 // Utility functions for the module.
1155 // Helper function to escape quotes in a string
1156 fn escape(s: String) -> String {
1157 s.replace("\"", "\"\"")
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()
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 {
1170 krate: id.krate.as_u32(),
1171 index: id.index.as_raw_u32(),
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).
1182 krate: LOCAL_CRATE.as_u32(),
1183 index: !id.as_u32(),
1188 fn null_id() -> rls_data::Id {
1190 krate: u32::max_value(),
1191 index: u32::max_value(),
1195 fn lower_attributes(attrs: Vec<Attribute>, scx: &SaveContext) -> Vec<rls_data::Attribute> {
1197 // Only retain real attributes. Doc comments are lowered separately.
1198 .filter(|attr| attr.path != "doc")
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();
1209 rls_data::Attribute {
1211 span: scx.span_from_span(attr.span),