1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
3 #![cfg_attr(bootstrap, feature(or_patterns))]
4 #![recursion_limit = "256"]
13 use rustc_ast::util::comments::beautify_doc_string;
14 use rustc_ast_pretty::pprust::attribute_to_string;
16 use rustc_hir::def::{DefKind as HirDefKind, Res};
17 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
18 use rustc_hir::intravisit::{self, Visitor};
20 use rustc_hir_pretty::{enum_def_to_string, fn_to_string, ty_to_string};
21 use rustc_middle::hir::map::Map;
22 use rustc_middle::middle::cstore::ExternCrate;
23 use rustc_middle::middle::privacy::AccessLevels;
24 use rustc_middle::ty::{self, print::with_no_trimmed_paths, DefIdTree, TyCtxt};
25 use rustc_middle::{bug, span_bug};
26 use rustc_session::config::{CrateType, Input, OutputType};
27 use rustc_session::output::{filename_for_metadata, out_filename};
28 use rustc_span::source_map::Spanned;
29 use rustc_span::symbol::Ident;
33 use std::default::Default;
36 use std::io::BufWriter;
37 use std::path::{Path, PathBuf};
39 use dump_visitor::DumpVisitor;
40 use span_utils::SpanUtils;
42 use rls_data::config::Config;
44 Analysis, Def, DefKind, ExternalCrateData, GlobalCrateId, Impl, ImplKind, MacroRef, Ref,
45 RefKind, Relation, RelationKind, SpanData,
48 use tracing::{debug, error, info};
50 pub struct SaveContext<'tcx> {
52 maybe_typeck_results: Option<&'tcx ty::TypeckResults<'tcx>>,
53 access_levels: &'tcx AccessLevels,
54 span_utils: SpanUtils<'tcx>,
56 impl_counter: Cell<u32>,
63 RelationData(Relation, Impl),
66 impl<'tcx> SaveContext<'tcx> {
67 /// Gets the type-checking results for the current body.
68 /// As this will ICE if called outside bodies, only call when working with
69 /// `Expr` or `Pat` nodes (they are guaranteed to be found only in bodies).
71 fn typeck_results(&self) -> &'tcx ty::TypeckResults<'tcx> {
72 self.maybe_typeck_results.expect("`SaveContext::typeck_results` called outside of body")
75 fn span_from_span(&self, span: Span) -> SpanData {
76 use rls_span::{Column, Row};
78 let sm = self.tcx.sess.source_map();
79 let start = sm.lookup_char_pos(span.lo());
80 let end = sm.lookup_char_pos(span.hi());
83 file_name: start.file.name.to_string().into(),
84 byte_start: span.lo().0,
85 byte_end: span.hi().0,
86 line_start: Row::new_one_indexed(start.line as u32),
87 line_end: Row::new_one_indexed(end.line as u32),
88 column_start: Column::new_one_indexed(start.col.0 as u32 + 1),
89 column_end: Column::new_one_indexed(end.col.0 as u32 + 1),
93 // Returns path to the compilation output (e.g., libfoo-12345678.rmeta)
94 pub fn compilation_output(&self, crate_name: &str) -> PathBuf {
95 let sess = &self.tcx.sess;
96 // Save-analysis is emitted per whole session, not per each crate type
97 let crate_type = sess.crate_types()[0];
98 let outputs = &*self.tcx.output_filenames(LOCAL_CRATE);
100 if outputs.outputs.contains_key(&OutputType::Metadata) {
101 filename_for_metadata(sess, crate_name, outputs)
102 } else if outputs.outputs.should_codegen() {
103 out_filename(sess, crate_type, outputs, crate_name)
105 // Otherwise it's only a DepInfo, in which case we return early and
106 // not even reach the analysis stage.
111 // List external crates used by the current crate.
112 pub fn get_external_crates(&self) -> Vec<ExternalCrateData> {
113 let mut result = Vec::with_capacity(self.tcx.crates().len());
115 for &n in self.tcx.crates().iter() {
116 let span = match self.tcx.extern_crate(n.as_def_id()) {
117 Some(&ExternCrate { span, .. }) => span,
119 debug!("skipping crate {}, no data", n);
123 let lo_loc = self.span_utils.sess.source_map().lookup_char_pos(span.lo());
124 result.push(ExternalCrateData {
125 // FIXME: change file_name field to PathBuf in rls-data
126 // https://github.com/nrc/rls-data/issues/7
127 file_name: self.span_utils.make_filename_string(&lo_loc.file),
130 name: self.tcx.crate_name(n).to_string(),
131 disambiguator: self.tcx.crate_disambiguator(n).to_fingerprint().as_value(),
139 pub fn get_extern_item_data(&self, item: &hir::ForeignItem<'_>) -> Option<Data> {
140 let def_id = item.def_id.to_def_id();
141 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
142 let attrs = self.tcx.hir().attrs(item.hir_id());
144 hir::ForeignItemKind::Fn(ref decl, arg_names, ref generics) => {
145 filter!(self.span_utils, item.ident.span);
147 Some(Data::DefData(Def {
148 kind: DefKind::ForeignFunction,
149 id: id_from_def_id(def_id),
150 span: self.span_from_span(item.ident.span),
151 name: item.ident.to_string(),
156 // functions in extern block are implicitly unsafe
157 unsafety: hir::Unsafety::Unsafe,
158 // functions in extern block cannot be const
159 constness: hir::Constness::NotConst,
160 abi: self.tcx.hir().get_foreign_abi(item.hir_id()),
161 // functions in extern block cannot be async
162 asyncness: hir::IsAsync::NotAsync,
164 Some(item.ident.name),
173 docs: self.docs_for_attrs(attrs),
174 sig: sig::foreign_item_signature(item, self),
175 attributes: lower_attributes(attrs.to_vec(), self),
178 hir::ForeignItemKind::Static(ref ty, _) => {
179 filter!(self.span_utils, item.ident.span);
181 let id = id_from_def_id(def_id);
182 let span = self.span_from_span(item.ident.span);
184 Some(Data::DefData(Def {
185 kind: DefKind::ForeignStatic,
188 name: item.ident.to_string(),
190 value: ty_to_string(ty),
194 docs: self.docs_for_attrs(attrs),
195 sig: sig::foreign_item_signature(item, self),
196 attributes: lower_attributes(attrs.to_vec(), self),
199 // FIXME(plietar): needs a new DefKind in rls-data
200 hir::ForeignItemKind::Type => None,
204 pub fn get_item_data(&self, item: &hir::Item<'_>) -> Option<Data> {
205 let def_id = item.def_id.to_def_id();
206 let attrs = self.tcx.hir().attrs(item.hir_id());
208 hir::ItemKind::Fn(ref sig, ref generics, _) => {
209 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
210 filter!(self.span_utils, item.ident.span);
211 Some(Data::DefData(Def {
212 kind: DefKind::Function,
213 id: id_from_def_id(def_id),
214 span: self.span_from_span(item.ident.span),
215 name: item.ident.to_string(),
220 Some(item.ident.name),
229 docs: self.docs_for_attrs(attrs),
230 sig: sig::item_signature(item, self),
231 attributes: lower_attributes(attrs.to_vec(), self),
234 hir::ItemKind::Static(ref typ, ..) => {
235 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
237 filter!(self.span_utils, item.ident.span);
239 let id = id_from_def_id(def_id);
240 let span = self.span_from_span(item.ident.span);
242 Some(Data::DefData(Def {
243 kind: DefKind::Static,
246 name: item.ident.to_string(),
248 value: ty_to_string(&typ),
252 docs: self.docs_for_attrs(attrs),
253 sig: sig::item_signature(item, self),
254 attributes: lower_attributes(attrs.to_vec(), self),
257 hir::ItemKind::Const(ref typ, _) => {
258 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
259 filter!(self.span_utils, item.ident.span);
261 let id = id_from_def_id(def_id);
262 let span = self.span_from_span(item.ident.span);
264 Some(Data::DefData(Def {
265 kind: DefKind::Const,
268 name: item.ident.to_string(),
270 value: ty_to_string(typ),
274 docs: self.docs_for_attrs(attrs),
275 sig: sig::item_signature(item, self),
276 attributes: lower_attributes(attrs.to_vec(), self),
279 hir::ItemKind::Mod(ref m) => {
280 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
282 let sm = self.tcx.sess.source_map();
283 let filename = sm.span_to_filename(m.inner);
285 filter!(self.span_utils, item.ident.span);
287 Some(Data::DefData(Def {
289 id: id_from_def_id(def_id),
290 name: item.ident.to_string(),
292 span: self.span_from_span(item.ident.span),
293 value: filename.to_string(),
298 .map(|i| id_from_def_id(i.def_id.to_def_id()))
301 docs: self.docs_for_attrs(attrs),
302 sig: sig::item_signature(item, self),
303 attributes: lower_attributes(attrs.to_vec(), self),
306 hir::ItemKind::Enum(ref def, ref generics) => {
307 let name = item.ident.to_string();
308 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
309 filter!(self.span_utils, item.ident.span);
311 enum_def_to_string(def, generics, item.ident.name, item.span, &item.vis);
312 Some(Data::DefData(Def {
314 id: id_from_def_id(def_id),
315 span: self.span_from_span(item.ident.span),
320 children: def.variants.iter().map(|v| id_from_hir_id(v.id, self)).collect(),
322 docs: self.docs_for_attrs(attrs),
323 sig: sig::item_signature(item, self),
324 attributes: lower_attributes(attrs.to_vec(), self),
327 hir::ItemKind::Impl(hir::Impl { ref of_trait, ref self_ty, ref items, .. }) => {
328 if let hir::TyKind::Path(hir::QPath::Resolved(_, ref path)) = self_ty.kind {
329 // Common case impl for a struct or something basic.
330 if generated_code(path.span) {
333 let sub_span = path.segments.last().unwrap().ident.span;
334 filter!(self.span_utils, sub_span);
336 let impl_id = self.next_impl_id();
337 let span = self.span_from_span(sub_span);
339 let type_data = self.lookup_def_id(self_ty.hir_id);
340 type_data.map(|type_data| {
343 kind: RelationKind::Impl { id: impl_id },
345 from: id_from_def_id(type_data),
348 .and_then(|t| self.lookup_def_id(t.hir_ref_id))
350 .unwrap_or_else(null_id),
354 kind: match *of_trait {
355 Some(_) => ImplKind::Direct,
356 None => ImplKind::Inherent,
359 value: String::new(),
363 .map(|i| id_from_def_id(i.id.def_id.to_def_id()))
382 pub fn get_field_data(&self, field: &hir::FieldDef<'_>, scope: hir::HirId) -> Option<Def> {
383 let name = field.ident.to_string();
384 let scope_def_id = self.tcx.hir().local_def_id(scope).to_def_id();
385 let qualname = format!("::{}::{}", self.tcx.def_path_str(scope_def_id), field.ident);
386 filter!(self.span_utils, field.ident.span);
387 let field_def_id = self.tcx.hir().local_def_id(field.hir_id).to_def_id();
388 let typ = self.tcx.type_of(field_def_id).to_string();
390 let id = id_from_def_id(field_def_id);
391 let span = self.span_from_span(field.ident.span);
392 let attrs = self.tcx.hir().attrs(field.hir_id);
395 kind: DefKind::Field,
401 parent: Some(id_from_def_id(scope_def_id)),
404 docs: self.docs_for_attrs(attrs),
405 sig: sig::field_signature(field, self),
406 attributes: lower_attributes(attrs.to_vec(), self),
410 // FIXME would be nice to take a MethodItem here, but the ast provides both
411 // trait and impl flavours, so the caller must do the disassembly.
412 pub fn get_method_data(&self, hir_id: hir::HirId, ident: Ident, span: Span) -> Option<Def> {
413 // The qualname for a method is the trait name or name of the struct in an impl in
414 // which the method is declared in, followed by the method's name.
415 let def_id = self.tcx.hir().local_def_id(hir_id).to_def_id();
416 let (qualname, parent_scope, decl_id, docs, attributes) =
417 match self.tcx.impl_of_method(def_id) {
418 Some(impl_id) => match self.tcx.hir().get_if_local(impl_id) {
419 Some(Node::Item(item)) => match item.kind {
420 hir::ItemKind::Impl(hir::Impl { ref self_ty, .. }) => {
421 let hir = self.tcx.hir();
423 let mut qualname = String::from("<");
425 .push_str(&rustc_hir_pretty::id_to_string(&hir, self_ty.hir_id));
427 let trait_id = self.tcx.trait_id_of_impl(impl_id);
428 let mut docs = String::new();
429 let mut attrs = vec![];
430 if let Some(Node::ImplItem(_)) = hir.find(hir_id) {
431 attrs = self.tcx.hir().attrs(hir_id).to_vec();
432 docs = self.docs_for_attrs(&attrs);
435 let mut decl_id = None;
436 if let Some(def_id) = trait_id {
437 // A method in a trait impl.
438 qualname.push_str(" as ");
439 qualname.push_str(&self.tcx.def_path_str(def_id));
443 .associated_items(def_id)
444 .filter_by_name_unhygienic(ident.name)
446 .map(|item| item.def_id);
450 (qualname, trait_id, decl_id, docs, attrs)
455 "Container {:?} for method {} not an impl?",
464 "Container {:?} for method {} is not a node item {:?}",
471 None => match self.tcx.trait_of_item(def_id) {
473 let mut docs = String::new();
474 let mut attrs = vec![];
476 if let Some(Node::TraitItem(_)) = self.tcx.hir().find(hir_id) {
477 attrs = self.tcx.hir().attrs(hir_id).to_vec();
478 docs = self.docs_for_attrs(&attrs);
482 format!("::{}", self.tcx.def_path_str(def_id)),
490 debug!("could not find container for method {} at {:?}", hir_id, span);
491 // This is not necessarily a bug, if there was a compilation error,
492 // the typeck results we need might not exist.
498 let qualname = format!("{}::{}", qualname, ident.name);
500 filter!(self.span_utils, ident.span);
503 kind: DefKind::Method,
504 id: id_from_def_id(def_id),
505 span: self.span_from_span(ident.span),
506 name: ident.name.to_string(),
508 // FIXME you get better data here by using the visitor.
509 value: String::new(),
510 parent: parent_scope.map(id_from_def_id),
512 decl_id: decl_id.map(id_from_def_id),
515 attributes: lower_attributes(attributes, self),
519 pub fn get_trait_ref_data(&self, trait_ref: &hir::TraitRef<'_>) -> Option<Ref> {
520 self.lookup_def_id(trait_ref.hir_ref_id).and_then(|def_id| {
521 let span = trait_ref.path.span;
522 if generated_code(span) {
525 let sub_span = trait_ref.path.segments.last().unwrap().ident.span;
526 filter!(self.span_utils, sub_span);
527 let span = self.span_from_span(sub_span);
528 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) })
532 pub fn get_expr_data(&self, expr: &hir::Expr<'_>) -> Option<Data> {
533 let ty = self.typeck_results().expr_ty_adjusted_opt(expr)?;
534 if matches!(ty.kind(), ty::Error(_)) {
538 hir::ExprKind::Field(ref sub_ex, ident) => {
539 match self.typeck_results().expr_ty_adjusted(&sub_ex).kind() {
540 ty::Adt(def, _) if !def.is_enum() => {
541 let variant = &def.non_enum_variant();
542 filter!(self.span_utils, ident.span);
543 let span = self.span_from_span(ident.span);
544 Some(Data::RefData(Ref {
545 kind: RefKind::Variable,
549 .find_field_index(ident, variant)
550 .map(|index| id_from_def_id(variant.fields[index].did))
551 .unwrap_or_else(null_id),
554 ty::Tuple(..) => None,
556 debug!("expected struct or union type, found {:?}", ty);
561 hir::ExprKind::Struct(qpath, ..) => match ty.kind() {
563 let sub_span = qpath.last_segment_span();
564 filter!(self.span_utils, sub_span);
565 let span = self.span_from_span(sub_span);
566 Some(Data::RefData(Ref {
569 ref_id: id_from_def_id(def.did),
573 debug!("expected adt, found {:?}", ty);
577 hir::ExprKind::MethodCall(ref seg, ..) => {
578 let method_id = match self.typeck_results().type_dependent_def_id(expr.hir_id) {
581 debug!("could not resolve method id for {:?}", expr);
585 let (def_id, decl_id) = match self.tcx.associated_item(method_id).container {
586 ty::ImplContainer(_) => (Some(method_id), None),
587 ty::TraitContainer(_) => (None, Some(method_id)),
589 let sub_span = seg.ident.span;
590 filter!(self.span_utils, sub_span);
591 let span = self.span_from_span(sub_span);
592 Some(Data::RefData(Ref {
593 kind: RefKind::Function,
595 ref_id: def_id.or(decl_id).map(id_from_def_id).unwrap_or_else(null_id),
598 hir::ExprKind::Path(ref path) => {
599 self.get_path_data(expr.hir_id, path).map(Data::RefData)
603 bug!("invalid expression: {:?}", expr);
608 pub fn get_path_res(&self, hir_id: hir::HirId) -> Res {
609 match self.tcx.hir().get(hir_id) {
610 Node::TraitRef(tr) => tr.path.res,
612 Node::Item(&hir::Item { kind: hir::ItemKind::Use(path, _), .. }) => path.res,
613 Node::Visibility(&Spanned {
614 node: hir::VisibilityKind::Restricted { ref path, .. },
618 Node::PathSegment(seg) => match seg.res {
619 Some(res) if res != Res::Err => res,
621 let parent_node = self.tcx.hir().get_parent_node(hir_id);
622 self.get_path_res(parent_node)
626 Node::Expr(&hir::Expr { kind: hir::ExprKind::Struct(ref qpath, ..), .. }) => {
627 self.typeck_results().qpath_res(qpath, hir_id)
630 Node::Expr(&hir::Expr { kind: hir::ExprKind::Path(ref qpath), .. })
631 | Node::Pat(&hir::Pat {
633 hir::PatKind::Path(ref qpath)
634 | hir::PatKind::Struct(ref qpath, ..)
635 | hir::PatKind::TupleStruct(ref qpath, ..),
638 | Node::Ty(&hir::Ty { kind: hir::TyKind::Path(ref qpath), .. }) => match qpath {
639 hir::QPath::Resolved(_, path) => path.res,
640 hir::QPath::TypeRelative(..) | hir::QPath::LangItem(..) => {
641 // #75962: `self.typeck_results` may be different from the `hir_id`'s result.
642 if self.tcx.has_typeck_results(hir_id.owner.to_def_id()) {
643 self.tcx.typeck(hir_id.owner).qpath_res(qpath, hir_id)
650 Node::Binding(&hir::Pat {
651 kind: hir::PatKind::Binding(_, canonical_id, ..), ..
652 }) => Res::Local(canonical_id),
658 pub fn get_path_data(&self, id: hir::HirId, path: &hir::QPath<'_>) -> Option<Ref> {
659 let segment = match path {
660 hir::QPath::Resolved(_, path) => path.segments.last(),
661 hir::QPath::TypeRelative(_, segment) => Some(*segment),
662 hir::QPath::LangItem(..) => None,
664 segment.and_then(|seg| {
665 self.get_path_segment_data(seg).or_else(|| self.get_path_segment_data_with_id(seg, id))
669 pub fn get_path_segment_data(&self, path_seg: &hir::PathSegment<'_>) -> Option<Ref> {
670 self.get_path_segment_data_with_id(path_seg, path_seg.hir_id?)
673 pub fn get_path_segment_data_with_id(
675 path_seg: &hir::PathSegment<'_>,
678 // Returns true if the path is function type sugar, e.g., `Fn(A) -> B`.
679 fn fn_type(seg: &hir::PathSegment<'_>) -> bool {
680 seg.args.map_or(false, |args| args.parenthesized)
683 let res = self.get_path_res(id);
684 let span = path_seg.ident.span;
685 filter!(self.span_utils, span);
686 let span = self.span_from_span(span);
690 Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_hir_id(id, self) })
692 Res::Def(HirDefKind::Trait, def_id) if fn_type(path_seg) => {
693 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) })
697 | HirDefKind::Variant
700 | HirDefKind::TyAlias
701 | HirDefKind::ForeignTy
702 | HirDefKind::TraitAlias
703 | HirDefKind::AssocTy
705 | HirDefKind::OpaqueTy
706 | HirDefKind::TyParam,
708 ) => Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) }),
709 Res::Def(HirDefKind::ConstParam, def_id) => {
710 Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(def_id) })
712 Res::Def(HirDefKind::Ctor(..), def_id) => {
713 // This is a reference to a tuple struct or an enum variant where the def_id points
714 // to an invisible constructor function. That is not a very useful
715 // def, so adjust to point to the tuple struct or enum variant itself.
716 let parent_def_id = self.tcx.parent(def_id).unwrap();
717 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(parent_def_id) })
719 Res::Def(HirDefKind::Static | HirDefKind::Const | HirDefKind::AssocConst, _) => {
720 Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(res.def_id()) })
722 Res::Def(HirDefKind::AssocFn, decl_id) => {
723 let def_id = if decl_id.is_local() {
724 let ti = self.tcx.associated_item(decl_id);
727 .associated_items(ti.container.id())
728 .filter_by_name_unhygienic(ti.ident.name)
729 .find(|item| item.defaultness.has_value())
730 .map(|item| item.def_id)
735 kind: RefKind::Function,
737 ref_id: id_from_def_id(def_id.unwrap_or(decl_id)),
740 Res::Def(HirDefKind::Fn, def_id) => {
741 Some(Ref { kind: RefKind::Function, span, ref_id: id_from_def_id(def_id) })
743 Res::Def(HirDefKind::Mod, def_id) => {
744 Some(Ref { kind: RefKind::Mod, span, ref_id: id_from_def_id(def_id) })
748 HirDefKind::Macro(..)
749 | HirDefKind::ExternCrate
750 | HirDefKind::ForeignMod
751 | HirDefKind::LifetimeParam
752 | HirDefKind::AnonConst
755 | HirDefKind::GlobalAsm
757 | HirDefKind::Closure
758 | HirDefKind::Generator,
764 | Res::NonMacroAttr(..)
770 pub fn get_field_ref_data(
772 field_ref: &hir::ExprField<'_>,
773 variant: &ty::VariantDef,
775 filter!(self.span_utils, field_ref.ident.span);
776 self.tcx.find_field_index(field_ref.ident, variant).map(|index| {
777 let span = self.span_from_span(field_ref.ident.span);
778 Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(variant.fields[index].did) }
782 /// Attempt to return MacroRef for any AST node.
784 /// For a given piece of AST defined by the supplied Span and NodeId,
785 /// returns `None` if the node is not macro-generated or the span is malformed,
786 /// else uses the expansion callsite and callee to return some MacroRef.
787 pub fn get_macro_use_data(&self, span: Span) -> Option<MacroRef> {
788 if !generated_code(span) {
791 // Note we take care to use the source callsite/callee, to handle
792 // nested expansions and ensure we only generate data for source-visible
794 let callsite = span.source_callsite();
795 let callsite_span = self.span_from_span(callsite);
796 let callee = span.source_callee()?;
798 let mac_name = match callee.kind {
799 ExpnKind::Macro(kind, name) => match kind {
800 MacroKind::Bang => name,
802 // Ignore attribute macros, their spans are usually mangled
803 // FIXME(eddyb) is this really the case anymore?
804 MacroKind::Attr | MacroKind::Derive => return None,
807 // These are not macros.
808 // FIXME(eddyb) maybe there is a way to handle them usefully?
809 ExpnKind::Inlined | ExpnKind::Root | ExpnKind::AstPass(_) | ExpnKind::Desugaring(_) => {
814 let callee_span = self.span_from_span(callee.def_site);
817 qualname: mac_name.to_string(), // FIXME: generate the real qualname
822 fn lookup_def_id(&self, ref_id: hir::HirId) -> Option<DefId> {
823 match self.get_path_res(ref_id) {
824 Res::PrimTy(_) | Res::SelfTy(..) | Res::Err => None,
825 def => def.opt_def_id(),
829 fn docs_for_attrs(&self, attrs: &[ast::Attribute]) -> String {
830 let mut result = String::new();
833 if let Some(val) = attr.doc_str() {
834 // FIXME: Should save-analysis beautify doc strings itself or leave it to users?
835 result.push_str(&beautify_doc_string(val).as_str());
837 } else if self.tcx.sess.check_name(attr, sym::doc) {
838 if let Some(meta_list) = attr.meta_item_list() {
841 .filter(|it| it.has_name(sym::include))
842 .filter_map(|it| it.meta_item_list().map(|l| l.to_owned()))
844 .filter(|meta| meta.has_name(sym::contents))
845 .filter_map(|meta| meta.value_str())
847 result.push_str(&val.as_str());
854 if !self.config.full_docs {
855 if let Some(index) = result.find("\n\n") {
856 result.truncate(index);
863 fn next_impl_id(&self) -> u32 {
864 let next = self.impl_counter.get();
865 self.impl_counter.set(next + 1);
870 // An AST visitor for collecting paths (e.g., the names of structs) and formal
871 // variables (idents) from patterns.
872 struct PathCollector<'l> {
874 collected_paths: Vec<(hir::HirId, &'l hir::QPath<'l>)>,
875 collected_idents: Vec<(hir::HirId, Ident, hir::Mutability)>,
878 impl<'l> PathCollector<'l> {
879 fn new(tcx: TyCtxt<'l>) -> PathCollector<'l> {
880 PathCollector { tcx, collected_paths: vec![], collected_idents: vec![] }
884 impl<'l> Visitor<'l> for PathCollector<'l> {
887 fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap<Self::Map> {
888 intravisit::NestedVisitorMap::All(self.tcx.hir())
891 fn visit_pat(&mut self, p: &'l hir::Pat<'l>) {
893 hir::PatKind::Struct(ref path, ..) => {
894 self.collected_paths.push((p.hir_id, path));
896 hir::PatKind::TupleStruct(ref path, ..) | hir::PatKind::Path(ref path) => {
897 self.collected_paths.push((p.hir_id, path));
899 hir::PatKind::Binding(bm, _, ident, _) => {
901 "PathCollector, visit ident in pat {}: {:?} {:?}",
902 ident, p.span, ident.span
904 let immut = match bm {
905 // Even if the ref is mut, you can't change the ref, only
906 // the data pointed at, so showing the initialising expression
907 // is still worthwhile.
908 hir::BindingAnnotation::Unannotated | hir::BindingAnnotation::Ref => {
911 hir::BindingAnnotation::Mutable | hir::BindingAnnotation::RefMut => {
915 self.collected_idents.push((p.hir_id, ident, immut));
919 intravisit::walk_pat(self, p);
923 /// Defines what to do with the results of saving the analysis.
924 pub trait SaveHandler {
925 fn save(&mut self, save_ctxt: &SaveContext<'_>, analysis: &Analysis);
928 /// Dump the save-analysis results to a file.
929 pub struct DumpHandler<'a> {
930 odir: Option<&'a Path>,
934 impl<'a> DumpHandler<'a> {
935 pub fn new(odir: Option<&'a Path>, cratename: &str) -> DumpHandler<'a> {
936 DumpHandler { odir, cratename: cratename.to_owned() }
939 fn output_file(&self, ctx: &SaveContext<'_>) -> (BufWriter<File>, PathBuf) {
940 let sess = &ctx.tcx.sess;
941 let file_name = match ctx.config.output_file {
942 Some(ref s) => PathBuf::from(s),
944 let mut root_path = match self.odir {
945 Some(val) => val.join("save-analysis"),
946 None => PathBuf::from("save-analysis-temp"),
949 if let Err(e) = std::fs::create_dir_all(&root_path) {
950 error!("Could not create directory {}: {}", root_path.display(), e);
953 let executable = sess.crate_types().iter().any(|ct| *ct == CrateType::Executable);
954 let mut out_name = if executable { String::new() } else { "lib".to_owned() };
955 out_name.push_str(&self.cratename);
956 out_name.push_str(&sess.opts.cg.extra_filename);
957 out_name.push_str(".json");
958 root_path.push(&out_name);
964 info!("Writing output to {}", file_name.display());
966 let output_file = BufWriter::new(File::create(&file_name).unwrap_or_else(|e| {
967 sess.fatal(&format!("Could not open {}: {}", file_name.display(), e))
970 (output_file, file_name)
974 impl SaveHandler for DumpHandler<'_> {
975 fn save(&mut self, save_ctxt: &SaveContext<'_>, analysis: &Analysis) {
976 let sess = &save_ctxt.tcx.sess;
977 let (output, file_name) = self.output_file(&save_ctxt);
978 if let Err(e) = serde_json::to_writer(output, &analysis) {
979 error!("Can't serialize save-analysis: {:?}", e);
982 if sess.opts.json_artifact_notifications {
983 sess.parse_sess.span_diagnostic.emit_artifact_notification(&file_name, "save-analysis");
988 /// Call a callback with the results of save-analysis.
989 pub struct CallbackHandler<'b> {
990 pub callback: &'b mut dyn FnMut(&rls_data::Analysis),
993 impl SaveHandler for CallbackHandler<'_> {
994 fn save(&mut self, _: &SaveContext<'_>, analysis: &Analysis) {
995 (self.callback)(analysis)
999 pub fn process_crate<'l, 'tcx, H: SaveHandler>(
1003 config: Option<Config>,
1006 with_no_trimmed_paths(|| {
1007 tcx.dep_graph.with_ignore(|| {
1008 info!("Dumping crate {}", cratename);
1010 // Privacy checking requires and is done after type checking; use a
1011 // fallback in case the access levels couldn't have been correctly computed.
1012 let access_levels = match tcx.sess.compile_status() {
1013 Ok(..) => tcx.privacy_access_levels(LOCAL_CRATE),
1014 Err(..) => tcx.arena.alloc(AccessLevels::default()),
1017 let save_ctxt = SaveContext {
1019 maybe_typeck_results: None,
1020 access_levels: &access_levels,
1021 span_utils: SpanUtils::new(&tcx.sess),
1022 config: find_config(config),
1023 impl_counter: Cell::new(0),
1026 let mut visitor = DumpVisitor::new(save_ctxt);
1028 visitor.dump_crate_info(cratename, tcx.hir().krate());
1029 visitor.dump_compilation_options(input, cratename);
1030 visitor.process_crate(tcx.hir().krate());
1032 handler.save(&visitor.save_ctxt, &visitor.analysis())
1037 fn find_config(supplied: Option<Config>) -> Config {
1038 if let Some(config) = supplied {
1042 match env::var_os("RUST_SAVE_ANALYSIS_CONFIG") {
1043 None => Config::default(),
1044 Some(config) => config
1047 .map_err(|_| error!("`RUST_SAVE_ANALYSIS_CONFIG` isn't UTF-8"))
1049 serde_json::from_str(cfg)
1050 .map_err(|_| error!("Could not deserialize save-analysis config"))
1052 .unwrap_or_default(),
1056 // Utility functions for the module.
1058 // Helper function to escape quotes in a string
1059 fn escape(s: String) -> String {
1060 s.replace("\"", "\"\"")
1063 // Helper function to determine if a span came from a
1064 // macro expansion or syntax extension.
1065 fn generated_code(span: Span) -> bool {
1066 span.from_expansion() || span.is_dummy()
1069 // DefId::index is a newtype and so the JSON serialisation is ugly. Therefore
1070 // we use our own Id which is the same, but without the newtype.
1071 fn id_from_def_id(id: DefId) -> rls_data::Id {
1072 rls_data::Id { krate: id.krate.as_u32(), index: id.index.as_u32() }
1075 fn id_from_hir_id(id: hir::HirId, scx: &SaveContext<'_>) -> rls_data::Id {
1076 let def_id = scx.tcx.hir().opt_local_def_id(id);
1077 def_id.map(|id| id_from_def_id(id.to_def_id())).unwrap_or_else(|| {
1078 // Create a *fake* `DefId` out of a `HirId` by combining the owner
1079 // `local_def_index` and the `local_id`.
1080 // This will work unless you have *billions* of definitions in a single
1081 // crate (very unlikely to actually happen).
1083 krate: LOCAL_CRATE.as_u32(),
1084 index: id.owner.local_def_index.as_u32() | id.local_id.as_u32().reverse_bits(),
1089 fn null_id() -> rls_data::Id {
1090 rls_data::Id { krate: u32::MAX, index: u32::MAX }
1093 fn lower_attributes(attrs: Vec<ast::Attribute>, scx: &SaveContext<'_>) -> Vec<rls_data::Attribute> {
1096 // Only retain real attributes. Doc comments are lowered separately.
1097 .filter(|attr| !attr.has_name(sym::doc))
1099 // Remove the surrounding '#[..]' or '#![..]' of the pretty printed
1100 // attribute. First normalize all inner attribute (#![..]) to outer
1101 // ones (#[..]), then remove the two leading and the one trailing character.
1102 attr.style = ast::AttrStyle::Outer;
1103 let value = attribute_to_string(&attr);
1104 // This str slicing works correctly, because the leading and trailing characters
1105 // are in the ASCII range and thus exactly one byte each.
1106 let value = value[2..value.len() - 1].to_string();
1108 rls_data::Attribute { value, span: scx.span_from_span(attr.span) }