src/librustc_passes/hir_stats.rs

   1 // Copyright 2016 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.
   4 //
   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.
  10
  11 // The visitors in this module collect sizes and counts of the most important
  12 // pieces of AST and HIR. The resulting numbers are good approximations but not
  13 // completely accurate (some things might be counted twice, others missed).
  14
  15 use rustc::hir;
  16 use rustc::hir::intravisit as hir_visit;
  17 use rustc::util::common::to_readable_str;
  18 use rustc::util::nodemap::{FxHashMap, FxHashSet};
  19 use syntax::ast::{self, NodeId, AttrId};
  20 use syntax::visit as ast_visit;
  21 use syntax_pos::Span;
  22
  23 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
  24 enum Id {
  25     Node(NodeId),
  26     Attr(AttrId),
  27     None,
  28 }
  29
  30 struct NodeData {
  31     count: usize,
  32     size: usize,
  33 }
  34
  35 struct StatCollector<'k> {
  36     krate: Option<&'k hir::Crate>,
  37     data: FxHashMap<&'static str, NodeData>,
  38     seen: FxHashSet<Id>,
  39 }
  40
  41 pub fn print_hir_stats(krate: &hir::Crate) {
  42     let mut collector = StatCollector {
  43         krate: Some(krate),
  44         data: FxHashMap(),
  45         seen: FxHashSet(),
  46     };
  47     hir_visit::walk_crate(&mut collector, krate);
  48     collector.print("HIR STATS");
  49 }
  50
  51 pub fn print_ast_stats<'v>(krate: &'v ast::Crate, title: &str) {
  52     let mut collector = StatCollector {
  53         krate: None,
  54         data: FxHashMap(),
  55         seen: FxHashSet(),
  56     };
  57     ast_visit::walk_crate(&mut collector, krate);
  58     collector.print(title);
  59 }
  60
  61 impl<'k> StatCollector<'k> {
  62
  63     fn record<T>(&mut self, label: &'static str, id: Id, node: &T) {
  64         if id != Id::None {
  65             if !self.seen.insert(id) {
  66                 return
  67             }
  68         }
  69
  70         let entry = self.data.entry(label).or_insert(NodeData {
  71             count: 0,
  72             size: 0,
  73         });
  74
  75         entry.count += 1;
  76         entry.size = ::std::mem::size_of_val(node);
  77     }
  78
  79     fn print(&self, title: &str) {
  80         let mut stats: Vec<_> = self.data.iter().collect();
  81
  82         stats.sort_by_key(|&(_, ref d)| d.count * d.size);
  83
  84         let mut total_size = 0;
  85
  86         println!("\n{}\n", title);
  87
  88         println!("{:<18}{:>18}{:>14}{:>14}",
  89             "Name", "Accumulated Size", "Count", "Item Size");
  90         println!("----------------------------------------------------------------");
  91
  92         for (label, data) in stats {
  93             println!("{:<18}{:>18}{:>14}{:>14}",
  94                 label,
  95                 to_readable_str(data.count * data.size),
  96                 to_readable_str(data.count),
  97                 to_readable_str(data.size));
  98
  99             total_size += data.count * data.size;
 100         }
 101         println!("----------------------------------------------------------------");
 102         println!("{:<18}{:>18}\n",
 103                 "Total",
 104                 to_readable_str(total_size));
 105     }
 106 }
 107
 108 impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
 109     fn nested_visit_map<'this>(&'this mut self) -> hir_visit::NestedVisitorMap<'this, 'v> {
 110         panic!("visit_nested_xxx must be manually implemented in this visitor")
 111     }
 112
 113     fn visit_nested_item(&mut self, id: hir::ItemId) {
 114         let nested_item = self.krate.unwrap().item(id.id);
 115         self.visit_item(nested_item)
 116     }
 117
 118     fn visit_nested_trait_item(&mut self, trait_item_id: hir::TraitItemId) {
 119         let nested_trait_item = self.krate.unwrap().trait_item(trait_item_id);
 120         self.visit_trait_item(nested_trait_item)
 121     }
 122
 123     fn visit_nested_impl_item(&mut self, impl_item_id: hir::ImplItemId) {
 124         let nested_impl_item = self.krate.unwrap().impl_item(impl_item_id);
 125         self.visit_impl_item(nested_impl_item)
 126     }
 127
 128     fn visit_nested_body(&mut self, body_id: hir::BodyId) {
 129         let nested_body = self.krate.unwrap().body(body_id);
 130         self.visit_body(nested_body)
 131     }
 132
 133     fn visit_item(&mut self, i: &'v hir::Item) {
 134         self.record("Item", Id::Node(i.id), i);
 135         hir_visit::walk_item(self, i)
 136     }
 137
 138     ///////////////////////////////////////////////////////////////////////////
 139
 140     fn visit_mod(&mut self, m: &'v hir::Mod, _s: Span, n: NodeId) {
 141         self.record("Mod", Id::None, m);
 142         hir_visit::walk_mod(self, m, n)
 143     }
 144     fn visit_foreign_item(&mut self, i: &'v hir::ForeignItem) {
 145         self.record("ForeignItem", Id::Node(i.id), i);
 146         hir_visit::walk_foreign_item(self, i)
 147     }
 148     fn visit_local(&mut self, l: &'v hir::Local) {
 149         self.record("Local", Id::Node(l.id), l);
 150         hir_visit::walk_local(self, l)
 151     }
 152     fn visit_block(&mut self, b: &'v hir::Block) {
 153         self.record("Block", Id::Node(b.id), b);
 154         hir_visit::walk_block(self, b)
 155     }
 156     fn visit_stmt(&mut self, s: &'v hir::Stmt) {
 157         self.record("Stmt", Id::Node(s.node.id()), s);
 158         hir_visit::walk_stmt(self, s)
 159     }
 160     fn visit_arm(&mut self, a: &'v hir::Arm) {
 161         self.record("Arm", Id::None, a);
 162         hir_visit::walk_arm(self, a)
 163     }
 164     fn visit_pat(&mut self, p: &'v hir::Pat) {
 165         self.record("Pat", Id::Node(p.id), p);
 166         hir_visit::walk_pat(self, p)
 167     }
 168     fn visit_decl(&mut self, d: &'v hir::Decl) {
 169         self.record("Decl", Id::None, d);
 170         hir_visit::walk_decl(self, d)
 171     }
 172     fn visit_expr(&mut self, ex: &'v hir::Expr) {
 173         self.record("Expr", Id::Node(ex.id), ex);
 174         hir_visit::walk_expr(self, ex)
 175     }
 176
 177     fn visit_ty(&mut self, t: &'v hir::Ty) {
 178         self.record("Ty", Id::Node(t.id), t);
 179         hir_visit::walk_ty(self, t)
 180     }
 181
 182     fn visit_fn(&mut self,
 183                 fk: hir_visit::FnKind<'v>,
 184                 fd: &'v hir::FnDecl,
 185                 b: hir::BodyId,
 186                 s: Span,
 187                 id: NodeId) {
 188         self.record("FnDecl", Id::None, fd);
 189         hir_visit::walk_fn(self, fk, fd, b, s, id)
 190     }
 191
 192     fn visit_where_predicate(&mut self, predicate: &'v hir::WherePredicate) {
 193         self.record("WherePredicate", Id::None, predicate);
 194         hir_visit::walk_where_predicate(self, predicate)
 195     }
 196
 197     fn visit_trait_item(&mut self, ti: &'v hir::TraitItem) {
 198         self.record("TraitItem", Id::Node(ti.id), ti);
 199         hir_visit::walk_trait_item(self, ti)
 200     }
 201     fn visit_impl_item(&mut self, ii: &'v hir::ImplItem) {
 202         self.record("ImplItem", Id::Node(ii.id), ii);
 203         hir_visit::walk_impl_item(self, ii)
 204     }
 205
 206     fn visit_param_bound(&mut self, bounds: &'v hir::GenericBound) {
 207         self.record("GenericBound", Id::None, bounds);
 208         hir_visit::walk_param_bound(self, bounds)
 209     }
 210
 211     fn visit_struct_field(&mut self, s: &'v hir::StructField) {
 212         self.record("StructField", Id::Node(s.id), s);
 213         hir_visit::walk_struct_field(self, s)
 214     }
 215
 216     fn visit_variant(&mut self,
 217                      v: &'v hir::Variant,
 218                      g: &'v hir::Generics,
 219                      item_id: NodeId) {
 220         self.record("Variant", Id::None, v);
 221         hir_visit::walk_variant(self, v, g, item_id)
 222     }
 223     fn visit_lifetime(&mut self, lifetime: &'v hir::Lifetime) {
 224         self.record("Lifetime", Id::Node(lifetime.id), lifetime);
 225         hir_visit::walk_lifetime(self, lifetime)
 226     }
 227     fn visit_qpath(&mut self, qpath: &'v hir::QPath, id: NodeId, span: Span) {
 228         self.record("QPath", Id::None, qpath);
 229         hir_visit::walk_qpath(self, qpath, id, span)
 230     }
 231     fn visit_path(&mut self, path: &'v hir::Path, _id: NodeId) {
 232         self.record("Path", Id::None, path);
 233         hir_visit::walk_path(self, path)
 234     }
 235     fn visit_path_segment(&mut self,
 236                           path_span: Span,
 237                           path_segment: &'v hir::PathSegment) {
 238         self.record("PathSegment", Id::None, path_segment);
 239         hir_visit::walk_path_segment(self, path_span, path_segment)
 240     }
 241     fn visit_assoc_type_binding(&mut self, type_binding: &'v hir::TypeBinding) {
 242         self.record("TypeBinding", Id::Node(type_binding.id), type_binding);
 243         hir_visit::walk_assoc_type_binding(self, type_binding)
 244     }
 245     fn visit_attribute(&mut self, attr: &'v ast::Attribute) {
 246         self.record("Attribute", Id::Attr(attr.id), attr);
 247     }
 248     fn visit_macro_def(&mut self, macro_def: &'v hir::MacroDef) {
 249         self.record("MacroDef", Id::Node(macro_def.id), macro_def);
 250         hir_visit::walk_macro_def(self, macro_def)
 251     }
 252 }
 253
 254 impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
 255
 256     fn visit_mod(&mut self, m: &'v ast::Mod, _s: Span, _a: &[ast::Attribute], _n: NodeId) {
 257         self.record("Mod", Id::None, m);
 258         ast_visit::walk_mod(self, m)
 259     }
 260
 261     fn visit_foreign_item(&mut self, i: &'v ast::ForeignItem) {
 262         self.record("ForeignItem", Id::None, i);
 263         ast_visit::walk_foreign_item(self, i)
 264     }
 265
 266     fn visit_item(&mut self, i: &'v ast::Item) {
 267         self.record("Item", Id::None, i);
 268         ast_visit::walk_item(self, i)
 269     }
 270
 271     fn visit_local(&mut self, l: &'v ast::Local) {
 272         self.record("Local", Id::None, l);
 273         ast_visit::walk_local(self, l)
 274     }
 275
 276     fn visit_block(&mut self, b: &'v ast::Block) {
 277         self.record("Block", Id::None, b);
 278         ast_visit::walk_block(self, b)
 279     }
 280
 281     fn visit_stmt(&mut self, s: &'v ast::Stmt) {
 282         self.record("Stmt", Id::None, s);
 283         ast_visit::walk_stmt(self, s)
 284     }
 285
 286     fn visit_arm(&mut self, a: &'v ast::Arm) {
 287         self.record("Arm", Id::None, a);
 288         ast_visit::walk_arm(self, a)
 289     }
 290
 291     fn visit_pat(&mut self, p: &'v ast::Pat) {
 292         self.record("Pat", Id::None, p);
 293         ast_visit::walk_pat(self, p)
 294     }
 295
 296     fn visit_expr(&mut self, ex: &'v ast::Expr) {
 297         self.record("Expr", Id::None, ex);
 298         ast_visit::walk_expr(self, ex)
 299     }
 300
 301     fn visit_ty(&mut self, t: &'v ast::Ty) {
 302         self.record("Ty", Id::None, t);
 303         ast_visit::walk_ty(self, t)
 304     }
 305
 306     fn visit_fn(&mut self,
 307                 fk: ast_visit::FnKind<'v>,
 308                 fd: &'v ast::FnDecl,
 309                 s: Span,
 310                 _: NodeId) {
 311         self.record("FnDecl", Id::None, fd);
 312         ast_visit::walk_fn(self, fk, fd, s)
 313     }
 314
 315     fn visit_trait_item(&mut self, ti: &'v ast::TraitItem) {
 316         self.record("TraitItem", Id::None, ti);
 317         ast_visit::walk_trait_item(self, ti)
 318     }
 319
 320     fn visit_impl_item(&mut self, ii: &'v ast::ImplItem) {
 321         self.record("ImplItem", Id::None, ii);
 322         ast_visit::walk_impl_item(self, ii)
 323     }
 324
 325     fn visit_param_bound(&mut self, bounds: &'v ast::GenericBound) {
 326         self.record("GenericBound", Id::None, bounds);
 327         ast_visit::walk_param_bound(self, bounds)
 328     }
 329
 330     fn visit_struct_field(&mut self, s: &'v ast::StructField) {
 331         self.record("StructField", Id::None, s);
 332         ast_visit::walk_struct_field(self, s)
 333     }
 334
 335     fn visit_variant(&mut self,
 336                      v: &'v ast::Variant,
 337                      g: &'v ast::Generics,
 338                      item_id: NodeId) {
 339         self.record("Variant", Id::None, v);
 340         ast_visit::walk_variant(self, v, g, item_id)
 341     }
 342
 343     fn visit_lifetime(&mut self, lifetime: &'v ast::Lifetime) {
 344         self.record("Lifetime", Id::None, lifetime);
 345         ast_visit::walk_lifetime(self, lifetime)
 346     }
 347
 348     fn visit_mac(&mut self, mac: &'v ast::Mac) {
 349         self.record("Mac", Id::None, mac);
 350     }
 351
 352     fn visit_path_segment(&mut self,
 353                           path_span: Span,
 354                           path_segment: &'v ast::PathSegment) {
 355         self.record("PathSegment", Id::None, path_segment);
 356         ast_visit::walk_path_segment(self, path_span, path_segment)
 357     }
 358
 359     fn visit_assoc_type_binding(&mut self, type_binding: &'v ast::TypeBinding) {
 360         self.record("TypeBinding", Id::None, type_binding);
 361         ast_visit::walk_assoc_type_binding(self, type_binding)
 362     }
 363
 364     fn visit_attribute(&mut self, attr: &'v ast::Attribute) {
 365         self.record("Attribute", Id::None, attr);
 366     }
 367 }