1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
3 #![feature(or_patterns)]
4 #![recursion_limit = "256"]
12 use rustc_ast::ast::{self};
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, 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 = self.tcx.hir().local_def_id(item.hir_id).to_def_id();
141 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
143 hir::ForeignItemKind::Fn(ref decl, arg_names, ref generics) => {
144 filter!(self.span_utils, item.ident.span);
146 Some(Data::DefData(Def {
147 kind: DefKind::ForeignFunction,
148 id: id_from_def_id(def_id),
149 span: self.span_from_span(item.ident.span),
150 name: item.ident.to_string(),
155 // functions in extern block are implicitly unsafe
156 unsafety: hir::Unsafety::Unsafe,
157 // functions in extern block cannot be const
158 constness: hir::Constness::NotConst,
159 abi: self.tcx.hir().get_foreign_abi(item.hir_id),
160 // functions in extern block cannot be async
161 asyncness: hir::IsAsync::NotAsync,
163 Some(item.ident.name),
172 docs: self.docs_for_attrs(&item.attrs),
173 sig: sig::foreign_item_signature(item, self),
174 attributes: lower_attributes(item.attrs.to_vec(), self),
177 hir::ForeignItemKind::Static(ref ty, _) => {
178 filter!(self.span_utils, item.ident.span);
180 let id = id_from_def_id(def_id);
181 let span = self.span_from_span(item.ident.span);
183 Some(Data::DefData(Def {
184 kind: DefKind::ForeignStatic,
187 name: item.ident.to_string(),
189 value: ty_to_string(ty),
193 docs: self.docs_for_attrs(&item.attrs),
194 sig: sig::foreign_item_signature(item, self),
195 attributes: lower_attributes(item.attrs.to_vec(), self),
198 // FIXME(plietar): needs a new DefKind in rls-data
199 hir::ForeignItemKind::Type => None,
203 pub fn get_item_data(&self, item: &hir::Item<'_>) -> Option<Data> {
204 let def_id = self.tcx.hir().local_def_id(item.hir_id).to_def_id();
206 hir::ItemKind::Fn(ref sig, ref generics, _) => {
207 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
208 filter!(self.span_utils, item.ident.span);
209 Some(Data::DefData(Def {
210 kind: DefKind::Function,
211 id: id_from_def_id(def_id),
212 span: self.span_from_span(item.ident.span),
213 name: item.ident.to_string(),
218 Some(item.ident.name),
227 docs: self.docs_for_attrs(&item.attrs),
228 sig: sig::item_signature(item, self),
229 attributes: lower_attributes(item.attrs.to_vec(), self),
232 hir::ItemKind::Static(ref typ, ..) => {
233 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
235 filter!(self.span_utils, item.ident.span);
237 let id = id_from_def_id(def_id);
238 let span = self.span_from_span(item.ident.span);
240 Some(Data::DefData(Def {
241 kind: DefKind::Static,
244 name: item.ident.to_string(),
246 value: ty_to_string(&typ),
250 docs: self.docs_for_attrs(&item.attrs),
251 sig: sig::item_signature(item, self),
252 attributes: lower_attributes(item.attrs.to_vec(), self),
255 hir::ItemKind::Const(ref typ, _) => {
256 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
257 filter!(self.span_utils, item.ident.span);
259 let id = id_from_def_id(def_id);
260 let span = self.span_from_span(item.ident.span);
262 Some(Data::DefData(Def {
263 kind: DefKind::Const,
266 name: item.ident.to_string(),
268 value: ty_to_string(typ),
272 docs: self.docs_for_attrs(&item.attrs),
273 sig: sig::item_signature(item, self),
274 attributes: lower_attributes(item.attrs.to_vec(), self),
277 hir::ItemKind::Mod(ref m) => {
278 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
280 let sm = self.tcx.sess.source_map();
281 let filename = sm.span_to_filename(m.inner);
283 filter!(self.span_utils, item.ident.span);
285 Some(Data::DefData(Def {
287 id: id_from_def_id(def_id),
288 name: item.ident.to_string(),
290 span: self.span_from_span(item.ident.span),
291 value: filename.to_string(),
293 children: m.item_ids.iter().map(|i| id_from_hir_id(i.id, self)).collect(),
295 docs: self.docs_for_attrs(&item.attrs),
296 sig: sig::item_signature(item, self),
297 attributes: lower_attributes(item.attrs.to_vec(), self),
300 hir::ItemKind::Enum(ref def, ref generics) => {
301 let name = item.ident.to_string();
302 let qualname = format!("::{}", self.tcx.def_path_str(def_id));
303 filter!(self.span_utils, item.ident.span);
305 enum_def_to_string(def, generics, item.ident.name, item.span, &item.vis);
306 Some(Data::DefData(Def {
308 id: id_from_def_id(def_id),
309 span: self.span_from_span(item.ident.span),
314 children: def.variants.iter().map(|v| id_from_hir_id(v.id, self)).collect(),
316 docs: self.docs_for_attrs(&item.attrs),
317 sig: sig::item_signature(item, self),
318 attributes: lower_attributes(item.attrs.to_vec(), self),
321 hir::ItemKind::Impl { ref of_trait, ref self_ty, ref items, .. } => {
322 if let hir::TyKind::Path(hir::QPath::Resolved(_, ref path)) = self_ty.kind {
323 // Common case impl for a struct or something basic.
324 if generated_code(path.span) {
327 let sub_span = path.segments.last().unwrap().ident.span;
328 filter!(self.span_utils, sub_span);
330 let impl_id = self.next_impl_id();
331 let span = self.span_from_span(sub_span);
333 let type_data = self.lookup_def_id(self_ty.hir_id);
334 type_data.map(|type_data| {
337 kind: RelationKind::Impl { id: impl_id },
339 from: id_from_def_id(type_data),
342 .and_then(|t| self.lookup_def_id(t.hir_ref_id))
344 .unwrap_or_else(null_id),
348 kind: match *of_trait {
349 Some(_) => ImplKind::Direct,
350 None => ImplKind::Inherent,
353 value: String::new(),
357 .map(|i| id_from_hir_id(i.id.hir_id, self))
376 pub fn get_field_data(&self, field: &hir::StructField<'_>, scope: hir::HirId) -> Option<Def> {
377 let name = field.ident.to_string();
378 let scope_def_id = self.tcx.hir().local_def_id(scope).to_def_id();
379 let qualname = format!("::{}::{}", self.tcx.def_path_str(scope_def_id), field.ident);
380 filter!(self.span_utils, field.ident.span);
381 let field_def_id = self.tcx.hir().local_def_id(field.hir_id).to_def_id();
382 let typ = self.tcx.type_of(field_def_id).to_string();
384 let id = id_from_def_id(field_def_id);
385 let span = self.span_from_span(field.ident.span);
388 kind: DefKind::Field,
394 parent: Some(id_from_def_id(scope_def_id)),
397 docs: self.docs_for_attrs(&field.attrs),
398 sig: sig::field_signature(field, self),
399 attributes: lower_attributes(field.attrs.to_vec(), self),
403 // FIXME would be nice to take a MethodItem here, but the ast provides both
404 // trait and impl flavours, so the caller must do the disassembly.
405 pub fn get_method_data(&self, hir_id: hir::HirId, ident: Ident, span: Span) -> Option<Def> {
406 // The qualname for a method is the trait name or name of the struct in an impl in
407 // which the method is declared in, followed by the method's name.
408 let def_id = self.tcx.hir().local_def_id(hir_id).to_def_id();
409 let (qualname, parent_scope, decl_id, docs, attributes) =
410 match self.tcx.impl_of_method(def_id) {
411 Some(impl_id) => match self.tcx.hir().get_if_local(impl_id) {
412 Some(Node::Item(item)) => match item.kind {
413 hir::ItemKind::Impl { ref self_ty, .. } => {
414 let hir = self.tcx.hir();
416 let mut qualname = String::from("<");
418 .push_str(&rustc_hir_pretty::id_to_string(&hir, self_ty.hir_id));
420 let trait_id = self.tcx.trait_id_of_impl(impl_id);
421 let mut docs = String::new();
422 let mut attrs = vec![];
423 if let Some(Node::ImplItem(item)) = hir.find(hir_id) {
424 docs = self.docs_for_attrs(&item.attrs);
425 attrs = item.attrs.to_vec();
428 let mut decl_id = None;
429 if let Some(def_id) = trait_id {
430 // A method in a trait impl.
431 qualname.push_str(" as ");
432 qualname.push_str(&self.tcx.def_path_str(def_id));
436 .associated_items(def_id)
437 .filter_by_name_unhygienic(ident.name)
439 .map(|item| item.def_id);
441 qualname.push_str(">");
443 (qualname, trait_id, decl_id, docs, attrs)
448 "Container {:?} for method {} not an impl?",
457 "Container {:?} for method {} is not a node item {:?}",
464 None => match self.tcx.trait_of_item(def_id) {
466 let mut docs = String::new();
467 let mut attrs = vec![];
469 if let Some(Node::TraitItem(item)) = self.tcx.hir().find(hir_id) {
470 docs = self.docs_for_attrs(&item.attrs);
471 attrs = item.attrs.to_vec();
475 format!("::{}", self.tcx.def_path_str(def_id)),
483 debug!("could not find container for method {} at {:?}", hir_id, span);
484 // This is not necessarily a bug, if there was a compilation error,
485 // the typeck results we need might not exist.
491 let qualname = format!("{}::{}", qualname, ident.name);
493 filter!(self.span_utils, ident.span);
496 kind: DefKind::Method,
497 id: id_from_def_id(def_id),
498 span: self.span_from_span(ident.span),
499 name: ident.name.to_string(),
501 // FIXME you get better data here by using the visitor.
502 value: String::new(),
503 parent: parent_scope.map(id_from_def_id),
505 decl_id: decl_id.map(id_from_def_id),
508 attributes: lower_attributes(attributes, self),
512 pub fn get_trait_ref_data(&self, trait_ref: &hir::TraitRef<'_>) -> Option<Ref> {
513 self.lookup_def_id(trait_ref.hir_ref_id).and_then(|def_id| {
514 let span = trait_ref.path.span;
515 if generated_code(span) {
518 let sub_span = trait_ref.path.segments.last().unwrap().ident.span;
519 filter!(self.span_utils, sub_span);
520 let span = self.span_from_span(sub_span);
521 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) })
525 pub fn get_expr_data(&self, expr: &hir::Expr<'_>) -> Option<Data> {
526 let ty = self.typeck_results().expr_ty_adjusted_opt(expr)?;
527 if matches!(ty.kind, ty::Error(_)) {
531 hir::ExprKind::Field(ref sub_ex, ident) => {
532 match self.typeck_results().expr_ty_adjusted(&sub_ex).kind {
533 ty::Adt(def, _) if !def.is_enum() => {
534 let variant = &def.non_enum_variant();
535 filter!(self.span_utils, ident.span);
536 let span = self.span_from_span(ident.span);
537 Some(Data::RefData(Ref {
538 kind: RefKind::Variable,
542 .find_field_index(ident, variant)
543 .map(|index| id_from_def_id(variant.fields[index].did))
544 .unwrap_or_else(null_id),
547 ty::Tuple(..) => None,
549 debug!("expected struct or union type, found {:?}", ty);
554 hir::ExprKind::Struct(qpath, ..) => {
555 let segment = match qpath {
556 hir::QPath::Resolved(_, path) => path.segments.last().unwrap(),
557 hir::QPath::TypeRelative(_, segment) => segment,
558 hir::QPath::LangItem(..) => unimplemented!(),
562 let sub_span = segment.ident.span;
563 filter!(self.span_utils, sub_span);
564 let span = self.span_from_span(sub_span);
565 Some(Data::RefData(Ref {
568 ref_id: id_from_def_id(def.did),
572 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(..) => self
641 .maybe_typeck_results
642 .map_or(Res::Err, |typeck_results| typeck_results.qpath_res(qpath, hir_id)),
643 hir::QPath::LangItem(..) => unimplemented!(),
646 Node::Binding(&hir::Pat {
647 kind: hir::PatKind::Binding(_, canonical_id, ..), ..
648 }) => Res::Local(canonical_id),
654 pub fn get_path_data(&self, id: hir::HirId, path: &hir::QPath<'_>) -> Option<Ref> {
655 let segment = match path {
656 hir::QPath::Resolved(_, path) => path.segments.last(),
657 hir::QPath::TypeRelative(_, segment) => Some(*segment),
658 hir::QPath::LangItem(..) => unimplemented!(),
660 segment.and_then(|seg| {
661 self.get_path_segment_data(seg).or_else(|| self.get_path_segment_data_with_id(seg, id))
665 pub fn get_path_segment_data(&self, path_seg: &hir::PathSegment<'_>) -> Option<Ref> {
666 self.get_path_segment_data_with_id(path_seg, path_seg.hir_id?)
669 pub fn get_path_segment_data_with_id(
671 path_seg: &hir::PathSegment<'_>,
674 // Returns true if the path is function type sugar, e.g., `Fn(A) -> B`.
675 fn fn_type(seg: &hir::PathSegment<'_>) -> bool {
676 seg.args.map(|args| args.parenthesized).unwrap_or(false)
679 let res = self.get_path_res(id);
680 let span = path_seg.ident.span;
681 filter!(self.span_utils, span);
682 let span = self.span_from_span(span);
686 Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_hir_id(id, self) })
688 Res::Def(HirDefKind::Trait, def_id) if fn_type(path_seg) => {
689 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) })
693 | HirDefKind::Variant
696 | HirDefKind::TyAlias
697 | HirDefKind::ForeignTy
698 | HirDefKind::TraitAlias
699 | HirDefKind::AssocTy
701 | HirDefKind::OpaqueTy
702 | HirDefKind::TyParam,
704 ) => Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(def_id) }),
705 Res::Def(HirDefKind::ConstParam, def_id) => {
706 Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(def_id) })
708 Res::Def(HirDefKind::Ctor(..), def_id) => {
709 // This is a reference to a tuple struct or an enum variant where the def_id points
710 // to an invisible constructor function. That is not a very useful
711 // def, so adjust to point to the tuple struct or enum variant itself.
712 let parent_def_id = self.tcx.parent(def_id).unwrap();
713 Some(Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(parent_def_id) })
715 Res::Def(HirDefKind::Static | HirDefKind::Const | HirDefKind::AssocConst, _) => {
716 Some(Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(res.def_id()) })
718 Res::Def(HirDefKind::AssocFn, decl_id) => {
719 let def_id = if decl_id.is_local() {
720 let ti = self.tcx.associated_item(decl_id);
723 .associated_items(ti.container.id())
724 .filter_by_name_unhygienic(ti.ident.name)
725 .find(|item| item.defaultness.has_value())
726 .map(|item| item.def_id)
731 kind: RefKind::Function,
733 ref_id: id_from_def_id(def_id.unwrap_or(decl_id)),
736 Res::Def(HirDefKind::Fn, def_id) => {
737 Some(Ref { kind: RefKind::Function, span, ref_id: id_from_def_id(def_id) })
739 Res::Def(HirDefKind::Mod, def_id) => {
740 Some(Ref { kind: RefKind::Mod, span, ref_id: id_from_def_id(def_id) })
744 HirDefKind::Macro(..)
745 | HirDefKind::ExternCrate
746 | HirDefKind::ForeignMod
747 | HirDefKind::LifetimeParam
748 | HirDefKind::AnonConst
751 | HirDefKind::GlobalAsm
753 | HirDefKind::Closure
754 | HirDefKind::Generator,
760 | Res::NonMacroAttr(..)
766 pub fn get_field_ref_data(
768 field_ref: &hir::Field<'_>,
769 variant: &ty::VariantDef,
771 filter!(self.span_utils, field_ref.ident.span);
772 self.tcx.find_field_index(field_ref.ident, variant).map(|index| {
773 let span = self.span_from_span(field_ref.ident.span);
774 Ref { kind: RefKind::Variable, span, ref_id: id_from_def_id(variant.fields[index].did) }
778 /// Attempt to return MacroRef for any AST node.
780 /// For a given piece of AST defined by the supplied Span and NodeId,
781 /// returns `None` if the node is not macro-generated or the span is malformed,
782 /// else uses the expansion callsite and callee to return some MacroRef.
783 pub fn get_macro_use_data(&self, span: Span) -> Option<MacroRef> {
784 if !generated_code(span) {
787 // Note we take care to use the source callsite/callee, to handle
788 // nested expansions and ensure we only generate data for source-visible
790 let callsite = span.source_callsite();
791 let callsite_span = self.span_from_span(callsite);
792 let callee = span.source_callee()?;
794 let mac_name = match callee.kind {
795 ExpnKind::Macro(kind, name) => match kind {
796 MacroKind::Bang => name,
798 // Ignore attribute macros, their spans are usually mangled
799 // FIXME(eddyb) is this really the case anymore?
800 MacroKind::Attr | MacroKind::Derive => return None,
803 // These are not macros.
804 // FIXME(eddyb) maybe there is a way to handle them usefully?
805 ExpnKind::Root | ExpnKind::AstPass(_) | ExpnKind::Desugaring(_) => return None,
808 let callee_span = self.span_from_span(callee.def_site);
811 qualname: mac_name.to_string(), // FIXME: generate the real qualname
816 fn lookup_def_id(&self, ref_id: hir::HirId) -> Option<DefId> {
817 match self.get_path_res(ref_id) {
818 Res::PrimTy(_) | Res::SelfTy(..) | Res::Err => None,
819 def => def.opt_def_id(),
823 fn docs_for_attrs(&self, attrs: &[ast::Attribute]) -> String {
824 let mut result = String::new();
827 if let Some(val) = attr.doc_str() {
828 // FIXME: Should save-analysis beautify doc strings itself or leave it to users?
829 result.push_str(&beautify_doc_string(val));
831 } else if self.tcx.sess.check_name(attr, sym::doc) {
832 if let Some(meta_list) = attr.meta_item_list() {
835 .filter(|it| it.has_name(sym::include))
836 .filter_map(|it| it.meta_item_list().map(|l| l.to_owned()))
838 .filter(|meta| meta.has_name(sym::contents))
839 .filter_map(|meta| meta.value_str())
841 result.push_str(&val.as_str());
848 if !self.config.full_docs {
849 if let Some(index) = result.find("\n\n") {
850 result.truncate(index);
857 fn next_impl_id(&self) -> u32 {
858 let next = self.impl_counter.get();
859 self.impl_counter.set(next + 1);
864 // An AST visitor for collecting paths (e.g., the names of structs) and formal
865 // variables (idents) from patterns.
866 struct PathCollector<'l> {
868 collected_paths: Vec<(hir::HirId, &'l hir::QPath<'l>)>,
869 collected_idents: Vec<(hir::HirId, Ident, hir::Mutability)>,
872 impl<'l> PathCollector<'l> {
873 fn new(tcx: TyCtxt<'l>) -> PathCollector<'l> {
874 PathCollector { tcx, collected_paths: vec![], collected_idents: vec![] }
878 impl<'l> Visitor<'l> for PathCollector<'l> {
881 fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap<Self::Map> {
882 intravisit::NestedVisitorMap::All(self.tcx.hir())
885 fn visit_pat(&mut self, p: &'l hir::Pat<'l>) {
887 hir::PatKind::Struct(ref path, ..) => {
888 self.collected_paths.push((p.hir_id, path));
890 hir::PatKind::TupleStruct(ref path, ..) | hir::PatKind::Path(ref path) => {
891 self.collected_paths.push((p.hir_id, path));
893 hir::PatKind::Binding(bm, _, ident, _) => {
895 "PathCollector, visit ident in pat {}: {:?} {:?}",
896 ident, p.span, ident.span
898 let immut = match bm {
899 // Even if the ref is mut, you can't change the ref, only
900 // the data pointed at, so showing the initialising expression
901 // is still worthwhile.
902 hir::BindingAnnotation::Unannotated | hir::BindingAnnotation::Ref => {
905 hir::BindingAnnotation::Mutable | hir::BindingAnnotation::RefMut => {
909 self.collected_idents.push((p.hir_id, ident, immut));
913 intravisit::walk_pat(self, p);
917 /// Defines what to do with the results of saving the analysis.
918 pub trait SaveHandler {
919 fn save(&mut self, save_ctxt: &SaveContext<'_>, analysis: &Analysis);
922 /// Dump the save-analysis results to a file.
923 pub struct DumpHandler<'a> {
924 odir: Option<&'a Path>,
928 impl<'a> DumpHandler<'a> {
929 pub fn new(odir: Option<&'a Path>, cratename: &str) -> DumpHandler<'a> {
930 DumpHandler { odir, cratename: cratename.to_owned() }
933 fn output_file(&self, ctx: &SaveContext<'_>) -> (BufWriter<File>, PathBuf) {
934 let sess = &ctx.tcx.sess;
935 let file_name = match ctx.config.output_file {
936 Some(ref s) => PathBuf::from(s),
938 let mut root_path = match self.odir {
939 Some(val) => val.join("save-analysis"),
940 None => PathBuf::from("save-analysis-temp"),
943 if let Err(e) = std::fs::create_dir_all(&root_path) {
944 error!("Could not create directory {}: {}", root_path.display(), e);
947 let executable = sess.crate_types().iter().any(|ct| *ct == CrateType::Executable);
948 let mut out_name = if executable { String::new() } else { "lib".to_owned() };
949 out_name.push_str(&self.cratename);
950 out_name.push_str(&sess.opts.cg.extra_filename);
951 out_name.push_str(".json");
952 root_path.push(&out_name);
958 info!("Writing output to {}", file_name.display());
960 let output_file = BufWriter::new(File::create(&file_name).unwrap_or_else(|e| {
961 sess.fatal(&format!("Could not open {}: {}", file_name.display(), e))
964 (output_file, file_name)
968 impl SaveHandler for DumpHandler<'_> {
969 fn save(&mut self, save_ctxt: &SaveContext<'_>, analysis: &Analysis) {
970 let sess = &save_ctxt.tcx.sess;
971 let (output, file_name) = self.output_file(&save_ctxt);
972 if let Err(e) = serde_json::to_writer(output, &analysis) {
973 error!("Can't serialize save-analysis: {:?}", e);
976 if sess.opts.json_artifact_notifications {
977 sess.parse_sess.span_diagnostic.emit_artifact_notification(&file_name, "save-analysis");
982 /// Call a callback with the results of save-analysis.
983 pub struct CallbackHandler<'b> {
984 pub callback: &'b mut dyn FnMut(&rls_data::Analysis),
987 impl SaveHandler for CallbackHandler<'_> {
988 fn save(&mut self, _: &SaveContext<'_>, analysis: &Analysis) {
989 (self.callback)(analysis)
993 pub fn process_crate<'l, 'tcx, H: SaveHandler>(
997 config: Option<Config>,
1000 tcx.dep_graph.with_ignore(|| {
1001 info!("Dumping crate {}", cratename);
1003 // Privacy checking requires and is done after type checking; use a
1004 // fallback in case the access levels couldn't have been correctly computed.
1005 let access_levels = match tcx.sess.compile_status() {
1006 Ok(..) => tcx.privacy_access_levels(LOCAL_CRATE),
1007 Err(..) => tcx.arena.alloc(AccessLevels::default()),
1010 let save_ctxt = SaveContext {
1012 maybe_typeck_results: None,
1013 access_levels: &access_levels,
1014 span_utils: SpanUtils::new(&tcx.sess),
1015 config: find_config(config),
1016 impl_counter: Cell::new(0),
1019 let mut visitor = DumpVisitor::new(save_ctxt);
1021 visitor.dump_crate_info(cratename, tcx.hir().krate());
1022 visitor.dump_compilation_options(input, cratename);
1023 visitor.process_crate(tcx.hir().krate());
1025 handler.save(&visitor.save_ctxt, &visitor.analysis())
1029 fn find_config(supplied: Option<Config>) -> Config {
1030 if let Some(config) = supplied {
1034 match env::var_os("RUST_SAVE_ANALYSIS_CONFIG") {
1035 None => Config::default(),
1036 Some(config) => config
1039 .map_err(|_| error!("`RUST_SAVE_ANALYSIS_CONFIG` isn't UTF-8"))
1041 serde_json::from_str(cfg)
1042 .map_err(|_| error!("Could not deserialize save-analysis config"))
1044 .unwrap_or_default(),
1048 // Utility functions for the module.
1050 // Helper function to escape quotes in a string
1051 fn escape(s: String) -> String {
1052 s.replace("\"", "\"\"")
1055 // Helper function to determine if a span came from a
1056 // macro expansion or syntax extension.
1057 fn generated_code(span: Span) -> bool {
1058 span.from_expansion() || span.is_dummy()
1061 // DefId::index is a newtype and so the JSON serialisation is ugly. Therefore
1062 // we use our own Id which is the same, but without the newtype.
1063 fn id_from_def_id(id: DefId) -> rls_data::Id {
1064 rls_data::Id { krate: id.krate.as_u32(), index: id.index.as_u32() }
1067 fn id_from_hir_id(id: hir::HirId, scx: &SaveContext<'_>) -> rls_data::Id {
1068 let def_id = scx.tcx.hir().opt_local_def_id(id);
1069 def_id.map(|id| id_from_def_id(id.to_def_id())).unwrap_or_else(|| {
1070 // Create a *fake* `DefId` out of a `HirId` by combining the owner
1071 // `local_def_index` and the `local_id`.
1072 // This will work unless you have *billions* of definitions in a single
1073 // crate (very unlikely to actually happen).
1075 krate: LOCAL_CRATE.as_u32(),
1076 index: id.owner.local_def_index.as_u32() | id.local_id.as_u32().reverse_bits(),
1081 fn null_id() -> rls_data::Id {
1082 rls_data::Id { krate: u32::MAX, index: u32::MAX }
1085 fn lower_attributes(attrs: Vec<ast::Attribute>, scx: &SaveContext<'_>) -> Vec<rls_data::Attribute> {
1088 // Only retain real attributes. Doc comments are lowered separately.
1089 .filter(|attr| !attr.has_name(sym::doc))
1091 // Remove the surrounding '#[..]' or '#![..]' of the pretty printed
1092 // attribute. First normalize all inner attribute (#![..]) to outer
1093 // ones (#[..]), then remove the two leading and the one trailing character.
1094 attr.style = ast::AttrStyle::Outer;
1095 let value = attribute_to_string(&attr);
1096 // This str slicing works correctly, because the leading and trailing characters
1097 // are in the ASCII range and thus exactly one byte each.
1098 let value = value[2..value.len() - 1].to_string();
1100 rls_data::Attribute { value, span: scx.span_from_span(attr.span) }