src/librustc_lint/levels.rs

   1 use rustc::hir::intravisit;
   2 use rustc::lint::{LintLevelMap, LintLevelSets, LintLevelsBuilder, LintStore};
   3 use rustc::ty::query::Providers;
   4 use rustc::ty::TyCtxt;
   5 use rustc_hir as hir;
   6 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
   7 use syntax::ast;
   8
   9 pub use rustc_session::lint::{FutureIncompatibleInfo, Level, Lint, LintId};
  10
  11 fn lint_levels(tcx: TyCtxt<'_>, cnum: CrateNum) -> &LintLevelMap {
  12     assert_eq!(cnum, LOCAL_CRATE);
  13     let store = &tcx.lint_store;
  14     let mut builder = LintLevelMapBuilder {
  15         levels: LintLevelSets::builder(tcx.sess, false, &store),
  16         tcx: tcx,
  17         store: store,
  18     };
  19     let krate = tcx.hir().krate();
  20
  21     let push = builder.levels.push(&krate.attrs, &store);
  22     builder.levels.register_id(hir::CRATE_HIR_ID);
  23     for macro_def in krate.exported_macros {
  24         builder.levels.register_id(macro_def.hir_id);
  25     }
  26     intravisit::walk_crate(&mut builder, krate);
  27     builder.levels.pop(push);
  28
  29     tcx.arena.alloc(builder.levels.build_map())
  30 }
  31
  32 struct LintLevelMapBuilder<'a, 'tcx> {
  33     levels: LintLevelsBuilder<'tcx>,
  34     tcx: TyCtxt<'tcx>,
  35     store: &'a LintStore,
  36 }
  37
  38 impl LintLevelMapBuilder<'_, '_> {
  39     fn with_lint_attrs<F>(&mut self, id: hir::HirId, attrs: &[ast::Attribute], f: F)
  40     where
  41         F: FnOnce(&mut Self),
  42     {
  43         let push = self.levels.push(attrs, self.store);
  44         if push.changed {
  45             self.levels.register_id(id);
  46         }
  47         f(self);
  48         self.levels.pop(push);
  49     }
  50 }
  51
  52 impl<'tcx> intravisit::Visitor<'tcx> for LintLevelMapBuilder<'_, 'tcx> {
  53     fn nested_visit_map<'this>(&'this mut self) -> intravisit::NestedVisitorMap<'this, 'tcx> {
  54         intravisit::NestedVisitorMap::All(&self.tcx.hir())
  55     }
  56
  57     fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
  58         self.with_lint_attrs(param.hir_id, &param.attrs, |builder| {
  59             intravisit::walk_param(builder, param);
  60         });
  61     }
  62
  63     fn visit_item(&mut self, it: &'tcx hir::Item<'tcx>) {
  64         self.with_lint_attrs(it.hir_id, &it.attrs, |builder| {
  65             intravisit::walk_item(builder, it);
  66         });
  67     }
  68
  69     fn visit_foreign_item(&mut self, it: &'tcx hir::ForeignItem<'tcx>) {
  70         self.with_lint_attrs(it.hir_id, &it.attrs, |builder| {
  71             intravisit::walk_foreign_item(builder, it);
  72         })
  73     }
  74
  75     fn visit_expr(&mut self, e: &'tcx hir::Expr<'tcx>) {
  76         self.with_lint_attrs(e.hir_id, &e.attrs, |builder| {
  77             intravisit::walk_expr(builder, e);
  78         })
  79     }
  80
  81     fn visit_struct_field(&mut self, s: &'tcx hir::StructField<'tcx>) {
  82         self.with_lint_attrs(s.hir_id, &s.attrs, |builder| {
  83             intravisit::walk_struct_field(builder, s);
  84         })
  85     }
  86
  87     fn visit_variant(
  88         &mut self,
  89         v: &'tcx hir::Variant<'tcx>,
  90         g: &'tcx hir::Generics<'tcx>,
  91         item_id: hir::HirId,
  92     ) {
  93         self.with_lint_attrs(v.id, &v.attrs, |builder| {
  94             intravisit::walk_variant(builder, v, g, item_id);
  95         })
  96     }
  97
  98     fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
  99         self.with_lint_attrs(l.hir_id, &l.attrs, |builder| {
 100             intravisit::walk_local(builder, l);
 101         })
 102     }
 103
 104     fn visit_arm(&mut self, a: &'tcx hir::Arm<'tcx>) {
 105         self.with_lint_attrs(a.hir_id, &a.attrs, |builder| {
 106             intravisit::walk_arm(builder, a);
 107         })
 108     }
 109
 110     fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>) {
 111         self.with_lint_attrs(trait_item.hir_id, &trait_item.attrs, |builder| {
 112             intravisit::walk_trait_item(builder, trait_item);
 113         });
 114     }
 115
 116     fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) {
 117         self.with_lint_attrs(impl_item.hir_id, &impl_item.attrs, |builder| {
 118             intravisit::walk_impl_item(builder, impl_item);
 119         });
 120     }
 121 }
 122
 123 pub fn provide(providers: &mut Providers<'_>) {
 124     providers.lint_levels = lint_levels;
 125 }