Treat macros as HIR items

compiler/rustc_hir/src/arena.rs

@@ -35,7 +35,6 @@ macro_rules! arena_types {
             [few] inline_asm: rustc_hir::InlineAsm<$tcx>,
             [few] llvm_inline_asm: rustc_hir::LlvmInlineAsm<$tcx>,
             [] local: rustc_hir::Local<$tcx>,
-            [few] macro_def: rustc_hir::MacroDef<$tcx>,
             [few] mod_: rustc_hir::Mod<$tcx>,
             [] param: rustc_hir::Param<$tcx>,
             [] pat: rustc_hir::Pat<$tcx>,

compiler/rustc_hir/src/hir.rs

@@ -670,9 +670,6 @@ pub struct ModuleItems {
 /// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html
 #[derive(Debug)]
 pub struct Crate<'hir> {
-    // Attributes from non-exported macros, kept only for collecting the library feature list.
-    pub non_exported_macro_attrs: &'hir [Attribute],
-
     pub owners: IndexVec<LocalDefId, Option<OwnerNode<'hir>>>,
     pub bodies: BTreeMap<BodyId, Body<'hir>>,
     pub trait_impls: BTreeMap<DefId, Vec<LocalDefId>>,
@@ -768,32 +765,6 @@ impl Crate<'_> {
             _ => None,
         })
     }
-
-    pub fn exported_macros<'hir>(&'hir self) -> impl Iterator<Item = &'hir MacroDef<'hir>> + 'hir {
-        self.owners.iter().filter_map(|owner| match owner {
-            Some(OwnerNode::MacroDef(macro_def)) => Some(*macro_def),
-            _ => None,
-        })
-    }
-}
-
-/// A macro definition, in this crate or imported from another.
-///
-/// Not parsed directly, but created on macro import or `macro_rules!` expansion.
-#[derive(Debug)]
-pub struct MacroDef<'hir> {
-    pub ident: Ident,
-    pub vis: Visibility<'hir>,
-    pub def_id: LocalDefId,
-    pub span: Span,
-    pub ast: ast::MacroDef,
-}
-
-impl MacroDef<'_> {
-    #[inline]
-    pub fn hir_id(&self) -> HirId {
-        HirId::make_owner(self.def_id)
-    }
 }
 
 /// A block of statements `{ .. }`, which may have a label (in this case the
@@ -2602,7 +2573,7 @@ pub struct PolyTraitRef<'hir> {
 
 pub type Visibility<'hir> = Spanned<VisibilityKind<'hir>>;
 
-#[derive(Debug)]
+#[derive(Copy, Clone, Debug)]
 pub enum VisibilityKind<'hir> {
     Public,
     Crate(CrateSugar),
@@ -2791,6 +2762,8 @@ pub enum ItemKind<'hir> {
     Const(&'hir Ty<'hir>, BodyId),
     /// A function declaration.
     Fn(FnSig<'hir>, Generics<'hir>, BodyId),
+    /// A MBE macro definition (`macro_rules!` or `macro`).
+    Macro(ast::MacroDef),
     /// A module.
     Mod(Mod<'hir>),
     /// An external module, e.g. `extern { .. }`.
@@ -2856,6 +2829,7 @@ impl ItemKind<'_> {
             ItemKind::Static(..) => "static item",
             ItemKind::Const(..) => "constant item",
             ItemKind::Fn(..) => "function",
+            ItemKind::Macro(..) => "macro",
             ItemKind::Mod(..) => "module",
             ItemKind::ForeignMod { .. } => "extern block",
             ItemKind::GlobalAsm(..) => "global asm item",

compiler/rustc_hir/src/intravisit.rs

@@ -466,9 +466,6 @@ pub trait Visitor<'v>: Sized {
         walk_assoc_type_binding(self, type_binding)
     }
     fn visit_attribute(&mut self, _id: HirId, _attr: &'v Attribute) {}
-    fn visit_macro_def(&mut self, macro_def: &'v MacroDef<'v>) {
-        walk_macro_def(self, macro_def)
-    }
     fn visit_vis(&mut self, vis: &'v Visibility<'v>) {
         walk_vis(self, vis)
     }
@@ -484,7 +481,6 @@ pub trait Visitor<'v>: Sized {
 pub fn walk_crate<'v, V: Visitor<'v>>(visitor: &mut V, krate: &'v Crate<'v>) {
     let top_mod = krate.module();
     visitor.visit_mod(top_mod, top_mod.inner, CRATE_HIR_ID);
-    walk_list!(visitor, visit_macro_def, krate.exported_macros());
     for (&id, attrs) in krate.attrs.iter() {
         for a in *attrs {
             visitor.visit_attribute(id, a)
@@ -492,11 +488,6 @@ pub fn walk_crate<'v, V: Visitor<'v>>(visitor: &mut V, krate: &'v Crate<'v>) {
     }
 }
 
-pub fn walk_macro_def<'v, V: Visitor<'v>>(visitor: &mut V, macro_def: &'v MacroDef<'v>) {
-    visitor.visit_id(macro_def.hir_id());
-    visitor.visit_ident(macro_def.ident);
-}
-
 pub fn walk_mod<'v, V: Visitor<'v>>(visitor: &mut V, module: &'v Mod<'v>, mod_hir_id: HirId) {
     visitor.visit_id(mod_hir_id);
     for &item_id in module.item_ids {
@@ -586,6 +577,9 @@ pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item<'v>) {
             item.span,
             item.hir_id(),
         ),
+        ItemKind::Macro(_) => {
+            visitor.visit_id(item.hir_id());
+        }
         ItemKind::Mod(ref module) => {
             // `visit_mod()` takes care of visiting the `Item`'s `HirId`.
             visitor.visit_mod(module, item.span, item.hir_id())

compiler/rustc_hir/src/stable_hash_impls.rs

@@ -1,8 +1,8 @@
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
 
 use crate::hir::{
-    BodyId, Expr, ForeignItem, ForeignItemId, ImplItem, ImplItemId, Item, ItemId, MacroDef, Mod,
-    TraitItem, TraitItemId, Ty, VisibilityKind,
+    BodyId, Expr, ForeignItem, ForeignItemId, ImplItem, ImplItemId, Item, ItemId, Mod, TraitItem,
+    TraitItemId, Ty, VisibilityKind,
 };
 use crate::hir_id::{HirId, ItemLocalId};
 use rustc_span::def_id::DefPathHash;
@@ -190,16 +190,3 @@ impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for Item<'_> {
         });
     }
 }
-
-impl<HirCtx: crate::HashStableContext> HashStable<HirCtx> for MacroDef<'_> {
-    fn hash_stable(&self, hcx: &mut HirCtx, hasher: &mut StableHasher) {
-        let MacroDef { ident, def_id: _, ref ast, ref vis, span } = *self;
-
-        hcx.hash_hir_item_like(|hcx| {
-            ident.name.hash_stable(hcx, hasher);
-            ast.hash_stable(hcx, hasher);
-            vis.hash_stable(hcx, hasher);
-            span.hash_stable(hcx, hasher);
-        });
-    }
-}

compiler/rustc_hir/src/target.rs

@@ -111,6 +111,7 @@ impl Target {
             ItemKind::Static(..) => Target::Static,
             ItemKind::Const(..) => Target::Const,
             ItemKind::Fn(..) => Target::Fn,
+            ItemKind::Macro(..) => Target::MacroDef,
             ItemKind::Mod(..) => Target::Mod,
             ItemKind::ForeignMod { .. } => Target::ForeignMod,
             ItemKind::GlobalAsm(..) => Target::GlobalAsm,