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Remove Pat pre-lowering.

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This commit is contained in:
Camille GILLOT 2020-11-15 23:19:55 +01:00
parent 6e17ab57fc
commit 27c60bad8a
1 changed files with 5 additions and 43 deletions
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48
compiler/rustc_ast_lowering/src/lib.rs
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@ -425,7 +425,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
/// declared for every type and trait definition.
struct MiscCollector<'tcx, 'lowering, 'hir> {
lctx: &'tcx mut LoweringContext<'lowering, 'hir>,
hir_id_owner: Option<NodeId>,
}
impl MiscCollector<'_, '_, '_> {
@ -452,30 +451,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
}
}
}
fn with_hir_id_owner<T>(
&mut self,
owner: Option<NodeId>,
f: impl FnOnce(&mut Self) -> T,
) -> T {
let old = mem::replace(&mut self.hir_id_owner, owner);
let r = f(self);
self.hir_id_owner = old;
r
}
}
impl<'tcx> Visitor<'tcx> for MiscCollector<'tcx, '_, '_> {
fn visit_pat(&mut self, p: &'tcx Pat) {
if let PatKind::Paren(..) | PatKind::Rest = p.kind {
// Doesn't generate a HIR node
} else if let Some(owner) = self.hir_id_owner {
self.lctx.lower_node_id_with_owner(p.id, owner);
}
visit::walk_pat(self, p)
}
fn visit_item(&mut self, item: &'tcx Item) {
let hir_id = self.lctx.allocate_hir_id_counter(item.id);
@ -499,24 +477,12 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
_ => {}
}
self.with_hir_id_owner(Some(item.id), |this| {
visit::walk_item(this, item);
});
visit::walk_item(self, item);
}
fn visit_assoc_item(&mut self, item: &'tcx AssocItem, ctxt: AssocCtxt) {
self.lctx.allocate_hir_id_counter(item.id);
let owner = match (&item.kind, ctxt) {
// Ignore patterns in trait methods without bodies.
(AssocItemKind::Fn(_, _, _, None), AssocCtxt::Trait) => None,
_ => Some(item.id),
};
self.with_hir_id_owner(owner, |this| visit::walk_assoc_item(this, item, ctxt));
}
fn visit_foreign_item(&mut self, i: &'tcx ForeignItem) {
// Ignore patterns in foreign items
self.with_hir_id_owner(None, |this| visit::walk_foreign_item(this, i));
visit::walk_assoc_item(self, item, ctxt);
}
fn visit_ty(&mut self, t: &'tcx Ty) {
@ -527,18 +493,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// Mirrors visit::walk_fn_decl
for parameter in &f.decl.inputs {
// We don't lower the ids of argument patterns
self.with_hir_id_owner(None, |this| {
this.visit_pat(&parameter.pat);
});
self.visit_pat(&parameter.pat);
self.visit_ty(&parameter.ty)
}
self.visit_fn_ret_ty(&f.decl.output)
}
TyKind::ImplTrait(def_node_id, _) => {
self.lctx.allocate_hir_id_counter(def_node_id);
self.with_hir_id_owner(Some(def_node_id), |this| {
visit::walk_ty(this, t);
});
visit::walk_ty(self, t);
}
_ => visit::walk_ty(self, t),
}
@ -548,7 +510,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
self.lower_node_id(CRATE_NODE_ID);
debug_assert!(self.node_id_to_hir_id[CRATE_NODE_ID] == Some(hir::CRATE_HIR_ID));
visit::walk_crate(&mut MiscCollector { lctx: &mut self, hir_id_owner: None }, c);
visit::walk_crate(&mut MiscCollector { lctx: &mut self }, c);
visit::walk_crate(&mut item::ItemLowerer { lctx: &mut self }, c);
let module = self.lower_mod(&c.module);