1 // Copyright 2012-2013 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 //! Rust AST Visitor. Extracts useful information and massages it into a form
16 use rustc_target::spec::abi;
21 use rustc::hir::map as hir_map;
22 use rustc::hir::def::Def;
23 use rustc::hir::def_id::{DefId, LOCAL_CRATE};
24 use rustc::middle::cstore::{LoadedMacro, CrateStore};
25 use rustc::middle::privacy::AccessLevel;
26 use rustc::ty::Visibility;
27 use rustc::util::nodemap::{FxHashSet, FxHashMap};
32 use clean::{self, AttributesExt, NestedAttributesExt, def_id_to_path};
35 // looks to me like the first two of these are actually
36 // output parameters, maybe only mutated once; perhaps
37 // better simply to have the visit method return a tuple
40 // also, is there some reason that this doesn't use the 'visit'
41 // framework from syntax?
43 pub struct RustdocVisitor<'a, 'tcx: 'a, 'rcx: 'a> {
44 pub cstore: &'a CrateStore,
46 pub attrs: hir::HirVec<ast::Attribute>,
47 pub cx: &'a core::DocContext<'a, 'tcx, 'rcx>,
48 view_item_stack: FxHashSet<ast::NodeId>,
50 /// Is the current module and all of its parents public?
51 inside_public_path: bool,
52 exact_paths: Option<FxHashMap<DefId, Vec<String>>>,
55 impl<'a, 'tcx, 'rcx> RustdocVisitor<'a, 'tcx, 'rcx> {
56 pub fn new(cstore: &'a CrateStore,
57 cx: &'a core::DocContext<'a, 'tcx, 'rcx>) -> RustdocVisitor<'a, 'tcx, 'rcx> {
58 // If the root is re-exported, terminate all recursion.
59 let mut stack = FxHashSet();
60 stack.insert(ast::CRATE_NODE_ID);
62 module: Module::new(None),
63 attrs: hir::HirVec::new(),
65 view_item_stack: stack,
67 inside_public_path: true,
68 exact_paths: Some(FxHashMap()),
73 fn store_path(&mut self, did: DefId) {
74 // We can't use the entry api, as that keeps the mutable borrow of self active
75 // when we try to use cx
76 let exact_paths = self.exact_paths.as_mut().unwrap();
77 if exact_paths.get(&did).is_none() {
78 let path = def_id_to_path(self.cx, did, self.cx.crate_name.clone());
79 exact_paths.insert(did, path);
83 fn stability(&self, id: ast::NodeId) -> Option<attr::Stability> {
84 self.cx.tcx.hir.opt_local_def_id(id)
85 .and_then(|def_id| self.cx.tcx.lookup_stability(def_id)).cloned()
88 fn deprecation(&self, id: ast::NodeId) -> Option<attr::Deprecation> {
89 self.cx.tcx.hir.opt_local_def_id(id)
90 .and_then(|def_id| self.cx.tcx.lookup_deprecation(def_id))
93 pub fn visit(&mut self, krate: &hir::Crate) {
94 self.attrs = krate.attrs.clone();
96 self.module = self.visit_mod_contents(krate.span,
102 // attach the crate's exported macros to the top-level module:
103 let macro_exports: Vec<_> =
104 krate.exported_macros.iter().map(|def| self.visit_local_macro(def)).collect();
105 self.module.macros.extend(macro_exports);
106 self.module.is_crate = true;
108 self.cx.renderinfo.borrow_mut().exact_paths = self.exact_paths.take().unwrap();
111 pub fn visit_variant_data(&mut self, item: &hir::Item,
112 name: ast::Name, sd: &hir::VariantData,
113 generics: &hir::Generics) -> Struct {
114 debug!("Visiting struct");
115 let struct_type = struct_type_from_def(&*sd);
120 vis: item.vis.clone(),
121 stab: self.stability(item.id),
122 depr: self.deprecation(item.id),
123 attrs: item.attrs.clone(),
124 generics: generics.clone(),
125 fields: sd.fields().iter().cloned().collect(),
130 pub fn visit_union_data(&mut self, item: &hir::Item,
131 name: ast::Name, sd: &hir::VariantData,
132 generics: &hir::Generics) -> Union {
133 debug!("Visiting union");
134 let struct_type = struct_type_from_def(&*sd);
139 vis: item.vis.clone(),
140 stab: self.stability(item.id),
141 depr: self.deprecation(item.id),
142 attrs: item.attrs.clone(),
143 generics: generics.clone(),
144 fields: sd.fields().iter().cloned().collect(),
149 pub fn visit_enum_def(&mut self, it: &hir::Item,
150 name: ast::Name, def: &hir::EnumDef,
151 params: &hir::Generics) -> Enum {
152 debug!("Visiting enum");
155 variants: def.variants.iter().map(|v| Variant {
157 attrs: v.node.attrs.clone(),
158 stab: self.stability(v.node.data.id()),
159 depr: self.deprecation(v.node.data.id()),
160 def: v.node.data.clone(),
164 stab: self.stability(it.id),
165 depr: self.deprecation(it.id),
166 generics: params.clone(),
167 attrs: it.attrs.clone(),
173 pub fn visit_fn(&mut self, item: &hir::Item,
174 name: ast::Name, fd: &hir::FnDecl,
175 unsafety: &hir::Unsafety,
176 constness: hir::Constness,
179 body: hir::BodyId) -> Function {
180 debug!("Visiting fn");
183 vis: item.vis.clone(),
184 stab: self.stability(item.id),
185 depr: self.deprecation(item.id),
186 attrs: item.attrs.clone(),
190 generics: gen.clone(),
198 pub fn visit_mod_contents(&mut self, span: Span, attrs: hir::HirVec<ast::Attribute>,
199 vis: hir::Visibility, id: ast::NodeId,
201 name: Option<ast::Name>) -> Module {
202 let mut om = Module::new(name);
203 om.where_outer = span;
204 om.where_inner = m.inner;
206 om.vis = vis.clone();
207 om.stab = self.stability(id);
208 om.depr = self.deprecation(id);
210 // Keep track of if there were any private modules in the path.
211 let orig_inside_public_path = self.inside_public_path;
212 self.inside_public_path &= vis == hir::Public;
213 for i in &m.item_ids {
214 let item = self.cx.tcx.hir.expect_item(i.id);
215 self.visit_item(item, None, &mut om);
217 self.inside_public_path = orig_inside_public_path;
218 let def_id = self.cx.tcx.hir.local_def_id(id);
219 if let Some(exports) = self.cx.tcx.module_exports(def_id) {
220 for export in exports.iter().filter(|e| e.vis == Visibility::Public) {
221 if let Def::Macro(def_id, ..) = export.def {
222 // FIXME(50647): this eager macro inlining does not take
223 // doc(hidden)/doc(no_inline) into account
224 if def_id.krate == LOCAL_CRATE {
225 continue // These are `krate.exported_macros`, handled in `self.visit()`.
228 let imported_from = self.cx.tcx.original_crate_name(def_id.krate);
229 let def = match self.cstore.load_macro_untracked(def_id, self.cx.sess()) {
230 LoadedMacro::MacroDef(macro_def) => macro_def,
231 // FIXME(jseyfried): document proc macro re-exports
232 LoadedMacro::ProcMacro(..) => continue,
235 let matchers = if let ast::ItemKind::MacroDef(ref def) = def.node {
236 let tts: Vec<_> = def.stream().into_trees().collect();
237 tts.chunks(4).map(|arm| arm[0].span()).collect()
242 debug!("inlining macro {}", def.ident.name);
243 om.macros.push(Macro {
245 attrs: def.attrs.clone().into(),
246 name: def.ident.name,
247 whence: self.cx.tcx.def_span(def_id),
249 stab: self.cx.tcx.lookup_stability(def_id).cloned(),
250 depr: self.cx.tcx.lookup_deprecation(def_id),
251 imported_from: Some(imported_from),
259 /// Tries to resolve the target of a `pub use` statement and inlines the
260 /// target if it is defined locally and would not be documented otherwise,
261 /// or when it is specifically requested with `please_inline`.
262 /// (the latter is the case when the import is marked `doc(inline)`)
264 /// Cross-crate inlining occurs later on during crate cleaning
265 /// and follows different rules.
267 /// Returns true if the target has been inlined.
268 fn maybe_inline_local(&mut self,
271 renamed: Option<ast::Name>,
274 please_inline: bool) -> bool {
276 fn inherits_doc_hidden(cx: &core::DocContext, mut node: ast::NodeId) -> bool {
277 while let Some(id) = cx.tcx.hir.get_enclosing_scope(node) {
279 if cx.tcx.hir.attrs(node).lists("doc").has_word("hidden") {
282 if node == ast::CRATE_NODE_ID {
289 debug!("maybe_inline_local def: {:?}", def);
291 let tcx = self.cx.tcx;
295 let def_did = def.def_id();
297 let use_attrs = tcx.hir.attrs(id);
298 // Don't inline doc(hidden) imports so they can be stripped at a later stage.
299 let is_no_inline = use_attrs.lists("doc").has_word("no_inline") ||
300 use_attrs.lists("doc").has_word("hidden");
302 // For cross-crate impl inlining we need to know whether items are
303 // reachable in documentation - a previously nonreachable item can be
304 // made reachable by cross-crate inlining which we're checking here.
305 // (this is done here because we need to know this upfront)
306 if !def_did.is_local() && !is_no_inline {
307 let attrs = clean::inline::load_attrs(self.cx, def_did);
308 let self_is_hidden = attrs.lists("doc").has_word("hidden");
314 Def::TyForeign(did) |
315 Def::TyAlias(did) if !self_is_hidden => {
316 self.cx.access_levels.borrow_mut().map.insert(did, AccessLevel::Public);
318 Def::Mod(did) => if !self_is_hidden {
319 ::visit_lib::LibEmbargoVisitor::new(self.cx).visit_mod(did);
327 let def_node_id = match tcx.hir.as_local_node_id(def_did) {
328 Some(n) => n, None => return false
331 let is_private = !self.cx.access_levels.borrow().is_public(def_did);
332 let is_hidden = inherits_doc_hidden(self.cx, def_node_id);
334 // Only inline if requested or if the item would otherwise be stripped
335 if (!please_inline && !is_private && !is_hidden) || is_no_inline {
339 if !self.view_item_stack.insert(def_node_id) { return false }
341 let ret = match tcx.hir.get(def_node_id) {
342 hir_map::NodeItem(&hir::Item { node: hir::ItemMod(ref m), .. }) if glob => {
343 let prev = mem::replace(&mut self.inlining, true);
344 for i in &m.item_ids {
345 let i = self.cx.tcx.hir.expect_item(i.id);
346 self.visit_item(i, None, om);
348 self.inlining = prev;
351 hir_map::NodeItem(it) if !glob => {
352 let prev = mem::replace(&mut self.inlining, true);
353 self.visit_item(it, renamed, om);
354 self.inlining = prev;
357 hir_map::NodeForeignItem(it) if !glob => {
358 // generate a fresh `extern {}` block if we want to inline a foreign item.
359 om.foreigns.push(hir::ForeignMod {
360 abi: tcx.hir.get_foreign_abi(it.id),
361 items: vec![hir::ForeignItem {
362 name: renamed.unwrap_or(it.name),
368 hir_map::NodeStructCtor(_) if !glob => {
369 // struct constructors always show up alongside their struct definitions, we've
370 // already processed that so just discard this
375 self.view_item_stack.remove(&def_node_id);
379 pub fn visit_item(&mut self, item: &hir::Item,
380 renamed: Option<ast::Name>, om: &mut Module) {
381 debug!("Visiting item {:?}", item);
382 let name = renamed.unwrap_or(item.name);
384 if item.vis == hir::Public {
385 let def_id = self.cx.tcx.hir.local_def_id(item.id);
386 self.store_path(def_id);
390 hir::ItemForeignMod(ref fm) => {
391 // If inlining we only want to include public functions.
392 om.foreigns.push(if self.inlining {
395 items: fm.items.iter().filter(|i| i.vis == hir::Public).cloned().collect(),
401 // If we're inlining, skip private items.
402 _ if self.inlining && item.vis != hir::Public => {}
403 hir::ItemGlobalAsm(..) => {}
404 hir::ItemExternCrate(orig_name) => {
405 let def_id = self.cx.tcx.hir.local_def_id(item.id);
406 om.extern_crates.push(ExternCrate {
407 cnum: self.cx.tcx.extern_mod_stmt_cnum(def_id)
408 .unwrap_or(LOCAL_CRATE),
410 path: orig_name.map(|x|x.to_string()),
411 vis: item.vis.clone(),
412 attrs: item.attrs.clone(),
416 hir::ItemUse(_, hir::UseKind::ListStem) => {}
417 hir::ItemUse(ref path, kind) => {
418 let is_glob = kind == hir::UseKind::Glob;
420 // If there was a private module in the current path then don't bother inlining
421 // anything as it will probably be stripped anyway.
422 if item.vis == hir::Public && self.inside_public_path {
423 let please_inline = item.attrs.iter().any(|item| {
424 match item.meta_item_list() {
425 Some(ref list) if item.check_name("doc") => {
426 list.iter().any(|i| i.check_name("inline"))
431 let name = if is_glob { None } else { Some(name) };
432 if self.maybe_inline_local(item.id,
442 om.imports.push(Import {
445 vis: item.vis.clone(),
446 attrs: item.attrs.clone(),
447 path: (**path).clone(),
452 hir::ItemMod(ref m) => {
453 om.mods.push(self.visit_mod_contents(item.span,
460 hir::ItemEnum(ref ed, ref gen) =>
461 om.enums.push(self.visit_enum_def(item, name, ed, gen)),
462 hir::ItemStruct(ref sd, ref gen) =>
463 om.structs.push(self.visit_variant_data(item, name, sd, gen)),
464 hir::ItemUnion(ref sd, ref gen) =>
465 om.unions.push(self.visit_union_data(item, name, sd, gen)),
466 hir::ItemFn(ref fd, ref unsafety, constness, ref abi, ref gen, body) =>
467 om.fns.push(self.visit_fn(item, name, &**fd, unsafety,
468 constness, abi, gen, body)),
469 hir::ItemTy(ref ty, ref gen) => {
475 attrs: item.attrs.clone(),
477 vis: item.vis.clone(),
478 stab: self.stability(item.id),
479 depr: self.deprecation(item.id),
483 hir::ItemStatic(ref ty, ref mut_, ref exp) => {
486 mutability: mut_.clone(),
490 attrs: item.attrs.clone(),
492 vis: item.vis.clone(),
493 stab: self.stability(item.id),
494 depr: self.deprecation(item.id),
498 hir::ItemConst(ref ty, ref exp) => {
504 attrs: item.attrs.clone(),
506 vis: item.vis.clone(),
507 stab: self.stability(item.id),
508 depr: self.deprecation(item.id),
510 om.constants.push(s);
512 hir::ItemTrait(is_auto, unsafety, ref gen, ref b, ref item_ids) => {
513 let items = item_ids.iter()
514 .map(|ti| self.cx.tcx.hir.trait_item(ti.id).clone())
521 generics: gen.clone(),
522 bounds: b.iter().cloned().collect(),
524 attrs: item.attrs.clone(),
526 vis: item.vis.clone(),
527 stab: self.stability(item.id),
528 depr: self.deprecation(item.id),
532 hir::ItemTraitAlias(..) => {
533 unimplemented!("trait objects are not yet implemented")
536 hir::ItemImpl(unsafety,
543 // Don't duplicate impls when inlining, we'll pick them up
544 // regardless of where they're located.
546 let items = item_ids.iter()
547 .map(|ii| self.cx.tcx.hir.impl_item(ii.id).clone())
553 generics: gen.clone(),
557 attrs: item.attrs.clone(),
560 vis: item.vis.clone(),
561 stab: self.stability(item.id),
562 depr: self.deprecation(item.id),
570 // convert each exported_macro into a doc item
571 fn visit_local_macro(&self, def: &hir::MacroDef) -> Macro {
572 debug!("visit_local_macro: {}", def.name);
573 let tts = def.body.trees().collect::<Vec<_>>();
574 // Extract the spans of all matchers. They represent the "interface" of the macro.
575 let matchers = tts.chunks(4).map(|arm| arm[0].span()).collect();
578 def_id: self.cx.tcx.hir.local_def_id(def.id),
579 attrs: def.attrs.clone(),
583 stab: self.stability(def.id),
584 depr: self.deprecation(def.id),