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
18 use syntax::ext::base::MacroKind;
19 use syntax::source_map::Spanned;
20 use syntax_pos::{self, Span};
23 use rustc::hir::def::Def;
24 use rustc::hir::def_id::{DefId, LOCAL_CRATE};
25 use rustc::middle::privacy::AccessLevel;
26 use rustc::util::nodemap::{FxHashSet, FxHashMap};
31 use clean::{self, AttributesExt, NestedAttributesExt, def_id_to_path};
34 // looks to me like the first two of these are actually
35 // output parameters, maybe only mutated once; perhaps
36 // better simply to have the visit method return a tuple
39 // also, is there some reason that this doesn't use the 'visit'
40 // framework from syntax?
42 pub struct RustdocVisitor<'a, 'tcx: 'a, 'rcx: 'a, 'cstore: 'rcx> {
44 pub attrs: hir::HirVec<ast::Attribute>,
45 pub cx: &'a core::DocContext<'a, 'tcx, 'rcx, 'cstore>,
46 view_item_stack: FxHashSet<ast::NodeId>,
48 /// Is the current module and all of its parents public?
49 inside_public_path: bool,
50 exact_paths: Option<FxHashMap<DefId, Vec<String>>>,
53 impl<'a, 'tcx, 'rcx, 'cstore> RustdocVisitor<'a, 'tcx, 'rcx, 'cstore> {
55 cx: &'a core::DocContext<'a, 'tcx, 'rcx, 'cstore>
56 ) -> RustdocVisitor<'a, 'tcx, 'rcx, 'cstore> {
57 // If the root is re-exported, terminate all recursion.
58 let mut stack = FxHashSet::default();
59 stack.insert(ast::CRATE_NODE_ID);
61 module: Module::new(None),
62 attrs: hir::HirVec::new(),
64 view_item_stack: stack,
66 inside_public_path: true,
67 exact_paths: Some(FxHashMap::default()),
71 fn store_path(&mut self, did: DefId) {
72 // We can't use the entry api, as that keeps the mutable borrow of self active
73 // when we try to use cx
74 let exact_paths = self.exact_paths.as_mut().unwrap();
75 if exact_paths.get(&did).is_none() {
76 let path = def_id_to_path(self.cx, did, self.cx.crate_name.clone());
77 exact_paths.insert(did, path);
81 fn stability(&self, id: ast::NodeId) -> Option<attr::Stability> {
82 self.cx.tcx.hir().opt_local_def_id(id)
83 .and_then(|def_id| self.cx.tcx.lookup_stability(def_id)).cloned()
86 fn deprecation(&self, id: ast::NodeId) -> Option<attr::Deprecation> {
87 self.cx.tcx.hir().opt_local_def_id(id)
88 .and_then(|def_id| self.cx.tcx.lookup_deprecation(def_id))
91 pub fn visit(&mut self, krate: &hir::Crate) {
92 self.attrs = krate.attrs.clone();
94 self.module = self.visit_mod_contents(krate.span,
96 Spanned { span: syntax_pos::DUMMY_SP,
97 node: hir::VisibilityKind::Public },
101 // attach the crate's exported macros to the top-level module:
102 let macro_exports: Vec<_> =
103 krate.exported_macros.iter().map(|def| self.visit_local_macro(def, None)).collect();
104 self.module.macros.extend(macro_exports);
105 self.module.is_crate = true;
107 self.cx.renderinfo.borrow_mut().exact_paths = self.exact_paths.take().unwrap();
110 pub fn visit_variant_data(&mut self, item: &hir::Item,
111 name: ast::Name, sd: &hir::VariantData,
112 generics: &hir::Generics) -> Struct {
113 debug!("Visiting struct");
114 let struct_type = struct_type_from_def(&*sd);
119 vis: item.vis.clone(),
120 stab: self.stability(item.id),
121 depr: self.deprecation(item.id),
122 attrs: item.attrs.clone(),
123 generics: generics.clone(),
124 fields: sd.fields().iter().cloned().collect(),
129 pub fn visit_union_data(&mut self, item: &hir::Item,
130 name: ast::Name, sd: &hir::VariantData,
131 generics: &hir::Generics) -> Union {
132 debug!("Visiting union");
133 let struct_type = struct_type_from_def(&*sd);
138 vis: item.vis.clone(),
139 stab: self.stability(item.id),
140 depr: self.deprecation(item.id),
141 attrs: item.attrs.clone(),
142 generics: generics.clone(),
143 fields: sd.fields().iter().cloned().collect(),
148 pub fn visit_enum_def(&mut self, it: &hir::Item,
149 name: ast::Name, def: &hir::EnumDef,
150 params: &hir::Generics) -> Enum {
151 debug!("Visiting enum");
154 variants: def.variants.iter().map(|v| Variant {
156 attrs: v.node.attrs.clone(),
157 stab: self.stability(v.node.data.id()),
158 depr: self.deprecation(v.node.data.id()),
159 def: v.node.data.clone(),
163 stab: self.stability(it.id),
164 depr: self.deprecation(it.id),
165 generics: params.clone(),
166 attrs: it.attrs.clone(),
172 pub fn visit_fn(&mut self, om: &mut Module, item: &hir::Item,
173 name: ast::Name, fd: &hir::FnDecl,
174 header: hir::FnHeader,
177 debug!("Visiting fn");
178 let macro_kind = item.attrs.iter().filter_map(|a| {
179 if a.check_name("proc_macro") {
180 Some(MacroKind::Bang)
181 } else if a.check_name("proc_macro_derive") {
182 Some(MacroKind::Derive)
183 } else if a.check_name("proc_macro_attribute") {
184 Some(MacroKind::Attr)
191 let name = if kind == MacroKind::Derive {
192 item.attrs.lists("proc_macro_derive")
193 .filter_map(|mi| mi.name())
195 .expect("proc-macro derives require a name")
200 let mut helpers = Vec::new();
201 for mi in item.attrs.lists("proc_macro_derive") {
202 if !mi.check_name("attributes") {
206 if let Some(list) = mi.meta_item_list() {
207 for inner_mi in list {
208 if let Some(name) = inner_mi.name() {
215 om.proc_macros.push(ProcMacro {
220 attrs: item.attrs.clone(),
222 stab: self.stability(item.id),
223 depr: self.deprecation(item.id),
227 om.fns.push(Function {
229 vis: item.vis.clone(),
230 stab: self.stability(item.id),
231 depr: self.deprecation(item.id),
232 attrs: item.attrs.clone(),
236 generics: gen.clone(),
244 pub fn visit_mod_contents(&mut self, span: Span, attrs: hir::HirVec<ast::Attribute>,
245 vis: hir::Visibility, id: ast::NodeId,
247 name: Option<ast::Name>) -> Module {
248 let mut om = Module::new(name);
249 om.where_outer = span;
250 om.where_inner = m.inner;
252 om.vis = vis.clone();
253 om.stab = self.stability(id);
254 om.depr = self.deprecation(id);
256 // Keep track of if there were any private modules in the path.
257 let orig_inside_public_path = self.inside_public_path;
258 self.inside_public_path &= vis.node.is_pub();
259 for i in &m.item_ids {
260 let item = self.cx.tcx.hir().expect_item(i.id);
261 self.visit_item(item, None, &mut om);
263 self.inside_public_path = orig_inside_public_path;
267 /// Tries to resolve the target of a `pub use` statement and inlines the
268 /// target if it is defined locally and would not be documented otherwise,
269 /// or when it is specifically requested with `please_inline`.
270 /// (the latter is the case when the import is marked `doc(inline)`)
272 /// Cross-crate inlining occurs later on during crate cleaning
273 /// and follows different rules.
275 /// Returns true if the target has been inlined.
276 fn maybe_inline_local(&mut self,
279 renamed: Option<ast::Name>,
282 please_inline: bool) -> bool {
284 fn inherits_doc_hidden(cx: &core::DocContext, mut node: ast::NodeId) -> bool {
285 while let Some(id) = cx.tcx.hir().get_enclosing_scope(node) {
287 if cx.tcx.hir().attrs(node).lists("doc").has_word("hidden") {
290 if node == ast::CRATE_NODE_ID {
297 debug!("maybe_inline_local def: {:?}", def);
299 let tcx = self.cx.tcx;
303 let def_did = def.def_id();
305 let use_attrs = tcx.hir().attrs(id);
306 // Don't inline doc(hidden) imports so they can be stripped at a later stage.
307 let is_no_inline = use_attrs.lists("doc").has_word("no_inline") ||
308 use_attrs.lists("doc").has_word("hidden");
310 // For cross-crate impl inlining we need to know whether items are
311 // reachable in documentation - a previously nonreachable item can be
312 // made reachable by cross-crate inlining which we're checking here.
313 // (this is done here because we need to know this upfront)
314 if !def_did.is_local() && !is_no_inline {
315 let attrs = clean::inline::load_attrs(self.cx, def_did);
316 let self_is_hidden = attrs.lists("doc").has_word("hidden");
322 Def::ForeignTy(did) |
323 Def::TyAlias(did) if !self_is_hidden => {
327 .insert(did, AccessLevel::Public);
329 Def::Mod(did) => if !self_is_hidden {
330 ::visit_lib::LibEmbargoVisitor::new(self.cx).visit_mod(did);
338 let def_node_id = match tcx.hir().as_local_node_id(def_did) {
339 Some(n) => n, None => return false
342 let is_private = !self.cx.renderinfo.borrow().access_levels.is_public(def_did);
343 let is_hidden = inherits_doc_hidden(self.cx, def_node_id);
345 // Only inline if requested or if the item would otherwise be stripped
346 if (!please_inline && !is_private && !is_hidden) || is_no_inline {
350 if !self.view_item_stack.insert(def_node_id) { return false }
352 let ret = match tcx.hir().get(def_node_id) {
353 Node::Item(&hir::Item { node: hir::ItemKind::Mod(ref m), .. }) if glob => {
354 let prev = mem::replace(&mut self.inlining, true);
355 for i in &m.item_ids {
356 let i = self.cx.tcx.hir().expect_item(i.id);
357 self.visit_item(i, None, om);
359 self.inlining = prev;
362 Node::Item(it) if !glob => {
363 let prev = mem::replace(&mut self.inlining, true);
364 self.visit_item(it, renamed, om);
365 self.inlining = prev;
368 Node::ForeignItem(it) if !glob => {
369 // generate a fresh `extern {}` block if we want to inline a foreign item.
370 om.foreigns.push(hir::ForeignMod {
371 abi: tcx.hir().get_foreign_abi(it.id),
372 items: vec![hir::ForeignItem {
373 name: renamed.unwrap_or(it.name),
379 Node::MacroDef(def) if !glob => {
380 om.macros.push(self.visit_local_macro(def, renamed));
385 self.view_item_stack.remove(&def_node_id);
389 pub fn visit_item(&mut self, item: &hir::Item,
390 renamed: Option<ast::Name>, om: &mut Module) {
391 debug!("Visiting item {:?}", item);
392 let name = renamed.unwrap_or(item.name);
394 if item.vis.node.is_pub() {
395 let def_id = self.cx.tcx.hir().local_def_id(item.id);
396 self.store_path(def_id);
400 hir::ItemKind::ForeignMod(ref fm) => {
401 // If inlining we only want to include public functions.
402 om.foreigns.push(if self.inlining {
405 items: fm.items.iter().filter(|i| i.vis.node.is_pub()).cloned().collect(),
411 // If we're inlining, skip private items.
412 _ if self.inlining && !item.vis.node.is_pub() => {}
413 hir::ItemKind::GlobalAsm(..) => {}
414 hir::ItemKind::ExternCrate(orig_name) => {
415 let def_id = self.cx.tcx.hir().local_def_id(item.id);
416 om.extern_crates.push(ExternCrate {
417 cnum: self.cx.tcx.extern_mod_stmt_cnum(def_id)
418 .unwrap_or(LOCAL_CRATE),
420 path: orig_name.map(|x|x.to_string()),
421 vis: item.vis.clone(),
422 attrs: item.attrs.clone(),
426 hir::ItemKind::Use(_, hir::UseKind::ListStem) => {}
427 hir::ItemKind::Use(ref path, kind) => {
428 let is_glob = kind == hir::UseKind::Glob;
430 // struct and variant constructors always show up alongside their definitions, we've
431 // already processed them so just discard these.
433 Def::StructCtor(..) | Def::VariantCtor(..) | Def::SelfCtor(..) => return,
437 // If there was a private module in the current path then don't bother inlining
438 // anything as it will probably be stripped anyway.
439 if item.vis.node.is_pub() && self.inside_public_path {
440 let please_inline = item.attrs.iter().any(|item| {
441 match item.meta_item_list() {
442 Some(ref list) if item.check_name("doc") => {
443 list.iter().any(|i| i.check_name("inline"))
448 let name = if is_glob { None } else { Some(name) };
449 if self.maybe_inline_local(item.id,
459 om.imports.push(Import {
462 vis: item.vis.clone(),
463 attrs: item.attrs.clone(),
464 path: (**path).clone(),
469 hir::ItemKind::Mod(ref m) => {
470 om.mods.push(self.visit_mod_contents(item.span,
477 hir::ItemKind::Enum(ref ed, ref gen) =>
478 om.enums.push(self.visit_enum_def(item, name, ed, gen)),
479 hir::ItemKind::Struct(ref sd, ref gen) =>
480 om.structs.push(self.visit_variant_data(item, name, sd, gen)),
481 hir::ItemKind::Union(ref sd, ref gen) =>
482 om.unions.push(self.visit_union_data(item, name, sd, gen)),
483 hir::ItemKind::Fn(ref fd, header, ref gen, body) =>
484 self.visit_fn(om, item, name, &**fd, header, gen, body),
485 hir::ItemKind::Ty(ref ty, ref gen) => {
491 attrs: item.attrs.clone(),
493 vis: item.vis.clone(),
494 stab: self.stability(item.id),
495 depr: self.deprecation(item.id),
499 hir::ItemKind::Existential(ref exist_ty) => {
500 let t = Existential {
501 exist_ty: exist_ty.clone(),
504 attrs: item.attrs.clone(),
506 vis: item.vis.clone(),
507 stab: self.stability(item.id),
508 depr: self.deprecation(item.id),
510 om.existentials.push(t);
512 hir::ItemKind::Static(ref ty, ref mut_, ref exp) => {
515 mutability: mut_.clone(),
519 attrs: item.attrs.clone(),
521 vis: item.vis.clone(),
522 stab: self.stability(item.id),
523 depr: self.deprecation(item.id),
527 hir::ItemKind::Const(ref ty, ref exp) => {
533 attrs: item.attrs.clone(),
535 vis: item.vis.clone(),
536 stab: self.stability(item.id),
537 depr: self.deprecation(item.id),
539 om.constants.push(s);
541 hir::ItemKind::Trait(is_auto, unsafety, ref gen, ref b, ref item_ids) => {
542 let items = item_ids.iter()
543 .map(|ti| self.cx.tcx.hir().trait_item(ti.id).clone())
550 generics: gen.clone(),
551 bounds: b.iter().cloned().collect(),
553 attrs: item.attrs.clone(),
555 vis: item.vis.clone(),
556 stab: self.stability(item.id),
557 depr: self.deprecation(item.id),
561 hir::ItemKind::TraitAlias(..) => {
562 unimplemented!("trait objects are not yet implemented")
565 hir::ItemKind::Impl(unsafety,
572 // Don't duplicate impls when inlining or if it's implementing a trait, we'll pick
573 // them up regardless of where they're located.
574 if !self.inlining && tr.is_none() {
575 let items = item_ids.iter()
576 .map(|ii| self.cx.tcx.hir().impl_item(ii.id).clone())
582 generics: gen.clone(),
586 attrs: item.attrs.clone(),
589 vis: item.vis.clone(),
590 stab: self.stability(item.id),
591 depr: self.deprecation(item.id),
599 // convert each exported_macro into a doc item
600 fn visit_local_macro(
603 renamed: Option<ast::Name>
605 debug!("visit_local_macro: {}", def.name);
606 let tts = def.body.trees().collect::<Vec<_>>();
607 // Extract the spans of all matchers. They represent the "interface" of the macro.
608 let matchers = tts.chunks(4).map(|arm| arm[0].span()).collect();
611 def_id: self.cx.tcx.hir().local_def_id(def.id),
612 attrs: def.attrs.clone(),
613 name: renamed.unwrap_or(def.name),
616 stab: self.stability(def.id),
617 depr: self.deprecation(def.id),