1 // The visitors in this module collect sizes and counts of the most important
2 // pieces of AST and HIR. The resulting numbers are good approximations but not
3 // completely accurate (some things might be counted twice, others missed).
5 use rustc_ast::visit as ast_visit;
6 use rustc_ast::visit::BoundKind;
7 use rustc_ast::{self as ast, AttrId, NodeId};
8 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
10 use rustc_hir::intravisit as hir_visit;
12 use rustc_middle::hir::map::Map;
13 use rustc_middle::ty::TyCtxt;
14 use rustc_middle::util::common::to_readable_str;
17 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
29 struct StatCollector<'k> {
30 krate: Option<Map<'k>>,
31 data: FxHashMap<&'static str, NodeData>,
35 pub fn print_hir_stats(tcx: TyCtxt<'_>) {
36 let mut collector = StatCollector {
37 krate: Some(tcx.hir()),
38 data: FxHashMap::default(),
39 seen: FxHashSet::default(),
41 tcx.hir().walk_toplevel_module(&mut collector);
42 tcx.hir().walk_attributes(&mut collector);
43 collector.print("HIR STATS");
46 pub fn print_ast_stats(krate: &ast::Crate, title: &str) {
48 StatCollector { krate: None, data: FxHashMap::default(), seen: FxHashSet::default() };
49 ast_visit::walk_crate(&mut collector, krate);
50 collector.print(title);
53 impl<'k> StatCollector<'k> {
54 fn record<T>(&mut self, label: &'static str, id: Id, node: &T) {
55 if id != Id::None && !self.seen.insert(id) {
59 let entry = self.data.entry(label).or_insert(NodeData { count: 0, size: 0 });
62 entry.size = std::mem::size_of_val(node);
65 fn print(&self, title: &str) {
66 let mut stats: Vec<_> = self.data.iter().collect();
68 stats.sort_by_key(|&(_, ref d)| d.count * d.size);
70 let mut total_size = 0;
72 eprintln!("\n{}\n", title);
74 eprintln!("{:<18}{:>18}{:>14}{:>14}", "Name", "Accumulated Size", "Count", "Item Size");
75 eprintln!("----------------------------------------------------------------");
77 for (label, data) in stats {
79 "{:<18}{:>18}{:>14}{:>14}",
81 to_readable_str(data.count * data.size),
82 to_readable_str(data.count),
83 to_readable_str(data.size)
86 total_size += data.count * data.size;
88 eprintln!("----------------------------------------------------------------");
89 eprintln!("{:<18}{:>18}\n", "Total", to_readable_str(total_size));
93 impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
94 fn visit_param(&mut self, param: &'v hir::Param<'v>) {
95 self.record("Param", Id::Node(param.hir_id), param);
96 hir_visit::walk_param(self, param)
99 fn visit_nested_item(&mut self, id: hir::ItemId) {
100 let nested_item = self.krate.unwrap().item(id);
101 self.visit_item(nested_item)
104 fn visit_nested_trait_item(&mut self, trait_item_id: hir::TraitItemId) {
105 let nested_trait_item = self.krate.unwrap().trait_item(trait_item_id);
106 self.visit_trait_item(nested_trait_item)
109 fn visit_nested_impl_item(&mut self, impl_item_id: hir::ImplItemId) {
110 let nested_impl_item = self.krate.unwrap().impl_item(impl_item_id);
111 self.visit_impl_item(nested_impl_item)
114 fn visit_nested_foreign_item(&mut self, id: hir::ForeignItemId) {
115 let nested_foreign_item = self.krate.unwrap().foreign_item(id);
116 self.visit_foreign_item(nested_foreign_item);
119 fn visit_nested_body(&mut self, body_id: hir::BodyId) {
120 let nested_body = self.krate.unwrap().body(body_id);
121 self.visit_body(nested_body)
124 fn visit_item(&mut self, i: &'v hir::Item<'v>) {
125 self.record("Item", Id::Node(i.hir_id()), i);
126 hir_visit::walk_item(self, i)
129 fn visit_foreign_item(&mut self, i: &'v hir::ForeignItem<'v>) {
130 self.record("ForeignItem", Id::Node(i.hir_id()), i);
131 hir_visit::walk_foreign_item(self, i)
134 fn visit_local(&mut self, l: &'v hir::Local<'v>) {
135 self.record("Local", Id::Node(l.hir_id), l);
136 hir_visit::walk_local(self, l)
139 fn visit_block(&mut self, b: &'v hir::Block<'v>) {
140 self.record("Block", Id::Node(b.hir_id), b);
141 hir_visit::walk_block(self, b)
144 fn visit_stmt(&mut self, s: &'v hir::Stmt<'v>) {
145 self.record("Stmt", Id::Node(s.hir_id), s);
146 hir_visit::walk_stmt(self, s)
149 fn visit_arm(&mut self, a: &'v hir::Arm<'v>) {
150 self.record("Arm", Id::Node(a.hir_id), a);
151 hir_visit::walk_arm(self, a)
154 fn visit_pat(&mut self, p: &'v hir::Pat<'v>) {
155 self.record("Pat", Id::Node(p.hir_id), p);
156 hir_visit::walk_pat(self, p)
159 fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) {
160 self.record("Expr", Id::Node(ex.hir_id), ex);
161 hir_visit::walk_expr(self, ex)
164 fn visit_ty(&mut self, t: &'v hir::Ty<'v>) {
165 self.record("Ty", Id::Node(t.hir_id), t);
166 hir_visit::walk_ty(self, t)
171 fk: hir_visit::FnKind<'v>,
172 fd: &'v hir::FnDecl<'v>,
177 self.record("FnDecl", Id::None, fd);
178 hir_visit::walk_fn(self, fk, fd, b, s, id)
181 fn visit_where_predicate(&mut self, predicate: &'v hir::WherePredicate<'v>) {
182 self.record("WherePredicate", Id::None, predicate);
183 hir_visit::walk_where_predicate(self, predicate)
186 fn visit_trait_item(&mut self, ti: &'v hir::TraitItem<'v>) {
187 self.record("TraitItem", Id::Node(ti.hir_id()), ti);
188 hir_visit::walk_trait_item(self, ti)
191 fn visit_impl_item(&mut self, ii: &'v hir::ImplItem<'v>) {
192 self.record("ImplItem", Id::Node(ii.hir_id()), ii);
193 hir_visit::walk_impl_item(self, ii)
196 fn visit_param_bound(&mut self, bounds: &'v hir::GenericBound<'v>) {
197 self.record("GenericBound", Id::None, bounds);
198 hir_visit::walk_param_bound(self, bounds)
201 fn visit_field_def(&mut self, s: &'v hir::FieldDef<'v>) {
202 self.record("FieldDef", Id::Node(s.hir_id), s);
203 hir_visit::walk_field_def(self, s)
208 v: &'v hir::Variant<'v>,
209 g: &'v hir::Generics<'v>,
212 self.record("Variant", Id::None, v);
213 hir_visit::walk_variant(self, v, g, item_id)
216 fn visit_lifetime(&mut self, lifetime: &'v hir::Lifetime) {
217 self.record("Lifetime", Id::Node(lifetime.hir_id), lifetime);
218 hir_visit::walk_lifetime(self, lifetime)
221 fn visit_qpath(&mut self, qpath: &'v hir::QPath<'v>, id: hir::HirId, span: Span) {
222 self.record("QPath", Id::None, qpath);
223 hir_visit::walk_qpath(self, qpath, id, span)
226 fn visit_path(&mut self, path: &'v hir::Path<'v>, _id: hir::HirId) {
227 self.record("Path", Id::None, path);
228 hir_visit::walk_path(self, path)
231 fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v hir::PathSegment<'v>) {
232 self.record("PathSegment", Id::None, path_segment);
233 hir_visit::walk_path_segment(self, path_span, path_segment)
236 fn visit_assoc_type_binding(&mut self, type_binding: &'v hir::TypeBinding<'v>) {
237 self.record("TypeBinding", Id::Node(type_binding.hir_id), type_binding);
238 hir_visit::walk_assoc_type_binding(self, type_binding)
241 fn visit_attribute(&mut self, attr: &'v ast::Attribute) {
242 self.record("Attribute", Id::Attr(attr.id), attr);
246 impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
247 fn visit_foreign_item(&mut self, i: &'v ast::ForeignItem) {
248 self.record("ForeignItem", Id::None, i);
249 ast_visit::walk_foreign_item(self, i)
252 fn visit_item(&mut self, i: &'v ast::Item) {
253 self.record("Item", Id::None, i);
254 ast_visit::walk_item(self, i)
257 fn visit_local(&mut self, l: &'v ast::Local) {
258 self.record("Local", Id::None, l);
259 ast_visit::walk_local(self, l)
262 fn visit_block(&mut self, b: &'v ast::Block) {
263 self.record("Block", Id::None, b);
264 ast_visit::walk_block(self, b)
267 fn visit_stmt(&mut self, s: &'v ast::Stmt) {
268 self.record("Stmt", Id::None, s);
269 ast_visit::walk_stmt(self, s)
272 fn visit_arm(&mut self, a: &'v ast::Arm) {
273 self.record("Arm", Id::None, a);
274 ast_visit::walk_arm(self, a)
277 fn visit_pat(&mut self, p: &'v ast::Pat) {
278 self.record("Pat", Id::None, p);
279 ast_visit::walk_pat(self, p)
282 fn visit_expr(&mut self, ex: &'v ast::Expr) {
283 self.record("Expr", Id::None, ex);
284 ast_visit::walk_expr(self, ex)
287 fn visit_ty(&mut self, t: &'v ast::Ty) {
288 self.record("Ty", Id::None, t);
289 ast_visit::walk_ty(self, t)
292 fn visit_fn(&mut self, fk: ast_visit::FnKind<'v>, s: Span, _: NodeId) {
293 self.record("FnDecl", Id::None, fk.decl());
294 ast_visit::walk_fn(self, fk, s)
297 fn visit_assoc_item(&mut self, item: &'v ast::AssocItem, ctxt: ast_visit::AssocCtxt) {
298 let label = match ctxt {
299 ast_visit::AssocCtxt::Trait => "TraitItem",
300 ast_visit::AssocCtxt::Impl => "ImplItem",
302 self.record(label, Id::None, item);
303 ast_visit::walk_assoc_item(self, item, ctxt);
306 fn visit_param_bound(&mut self, bounds: &'v ast::GenericBound, _ctxt: BoundKind) {
307 self.record("GenericBound", Id::None, bounds);
308 ast_visit::walk_param_bound(self, bounds)
311 fn visit_field_def(&mut self, s: &'v ast::FieldDef) {
312 self.record("FieldDef", Id::None, s);
313 ast_visit::walk_field_def(self, s)
316 fn visit_variant(&mut self, v: &'v ast::Variant) {
317 self.record("Variant", Id::None, v);
318 ast_visit::walk_variant(self, v)
321 fn visit_lifetime(&mut self, lifetime: &'v ast::Lifetime, _: ast_visit::LifetimeCtxt) {
322 self.record("Lifetime", Id::None, lifetime);
323 ast_visit::walk_lifetime(self, lifetime)
326 fn visit_mac_call(&mut self, mac: &'v ast::MacCall) {
327 self.record("MacCall", Id::None, mac);
328 ast_visit::walk_mac(self, mac)
331 fn visit_path_segment(&mut self, path_span: Span, path_segment: &'v ast::PathSegment) {
332 self.record("PathSegment", Id::None, path_segment);
333 ast_visit::walk_path_segment(self, path_span, path_segment)
336 fn visit_assoc_constraint(&mut self, constraint: &'v ast::AssocConstraint) {
337 self.record("AssocConstraint", Id::None, constraint);
338 ast_visit::walk_assoc_constraint(self, constraint)
341 fn visit_attribute(&mut self, attr: &'v ast::Attribute) {
342 self.record("Attribute", Id::None, attr);