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Remove unused lowering field and method #51034

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May 26, 2018
Merged

Remove unused lowering field and method #51034

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101 changes: 35 additions & 66 deletions src/librustc/hir/lowering.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -82,10 +82,6 @@ pub struct LoweringContext<'a> {

cstore: &'a CrateStore,

// As we walk the AST we must keep track of the current 'parent' def id (in
// the form of a DefIndex) so that if we create a new node which introduces
// a definition, then we can properly create the def id.
parent_def: Option<DefIndex>,
resolver: &'a mut Resolver,
name_map: FxHashMap<Ident, Name>,

Expand Down Expand Up @@ -205,7 +201,6 @@ pub fn lower_crate(
crate_root: std_inject::injected_crate_name(),
sess,
cstore,
parent_def: None,
resolver,
name_map: FxHashMap(),
items: BTreeMap::new(),
Expand Down Expand Up @@ -885,22 +880,6 @@ impl<'a> LoweringContext<'a> {
result
}

fn with_parent_def<T, F>(&mut self, parent_id: NodeId, f: F) -> T
where
F: FnOnce(&mut LoweringContext) -> T,
{
let old_def = self.parent_def;
self.parent_def = {
let defs = self.resolver.definitions();
Some(defs.opt_def_index(parent_id).unwrap())
};

let result = f(self);

self.parent_def = old_def;
result
}

fn def_key(&mut self, id: DefId) -> DefKey {
if id.is_local() {
self.resolver.definitions().def_key(id.index)
Expand Down Expand Up @@ -2461,23 +2440,22 @@ impl<'a> LoweringContext<'a> {
}

fn lower_trait_item(&mut self, i: &TraitItem) -> hir::TraitItem {
self.with_parent_def(i.id, |this| {
let LoweredNodeId { node_id, hir_id } = this.lower_node_id(i.id);
let trait_item_def_id = this.resolver.definitions().local_def_id(node_id);
let LoweredNodeId { node_id, hir_id } = self.lower_node_id(i.id);
let trait_item_def_id = self.resolver.definitions().local_def_id(node_id);

let (generics, node) = match i.node {
TraitItemKind::Const(ref ty, ref default) => (
this.lower_generics(&i.generics, ImplTraitContext::Disallowed),
self.lower_generics(&i.generics, ImplTraitContext::Disallowed),
hir::TraitItemKind::Const(
this.lower_ty(ty, ImplTraitContext::Disallowed),
self.lower_ty(ty, ImplTraitContext::Disallowed),
default
.as_ref()
.map(|x| this.lower_body(None, |this| this.lower_expr(x))),
.map(|x| self.lower_body(None, |this| this.lower_expr(x))),
),
),
TraitItemKind::Method(ref sig, None) => {
let names = this.lower_fn_args_to_names(&sig.decl);
this.add_in_band_defs(
let names = self.lower_fn_args_to_names(&sig.decl);
self.add_in_band_defs(
&i.generics,
trait_item_def_id,
AnonymousLifetimeMode::PassThrough,
Expand All @@ -2490,12 +2468,12 @@ impl<'a> LoweringContext<'a> {
)
}
TraitItemKind::Method(ref sig, Some(ref body)) => {
let body_id = this.lower_body(Some(&sig.decl), |this| {
let body_id = self.lower_body(Some(&sig.decl), |this| {
let body = this.lower_block(body, false);
this.expr_block(body, ThinVec::new())
});

this.add_in_band_defs(
self.add_in_band_defs(
&i.generics,
trait_item_def_id,
AnonymousLifetimeMode::PassThrough,
Expand All @@ -2508,12 +2486,12 @@ impl<'a> LoweringContext<'a> {
)
}
TraitItemKind::Type(ref bounds, ref default) => (
this.lower_generics(&i.generics, ImplTraitContext::Disallowed),
self.lower_generics(&i.generics, ImplTraitContext::Disallowed),
hir::TraitItemKind::Type(
this.lower_bounds(bounds, ImplTraitContext::Disallowed),
self.lower_bounds(bounds, ImplTraitContext::Disallowed),
default
.as_ref()
.map(|x| this.lower_ty(x, ImplTraitContext::Disallowed)),
.map(|x| self.lower_ty(x, ImplTraitContext::Disallowed)),
),
),
TraitItemKind::Macro(..) => panic!("Shouldn't exist any more"),
Expand All @@ -2522,13 +2500,12 @@ impl<'a> LoweringContext<'a> {
hir::TraitItem {
id: node_id,
hir_id,
name: this.lower_ident(i.ident),
attrs: this.lower_attrs(&i.attrs),
name: self.lower_ident(i.ident),
attrs: self.lower_attrs(&i.attrs),
generics,
node,
span: i.span,
}
})
}

fn lower_trait_item_ref(&mut self, i: &TraitItem) -> hir::TraitItemRef {
Expand Down Expand Up @@ -2557,29 +2534,28 @@ impl<'a> LoweringContext<'a> {
}

fn lower_impl_item(&mut self, i: &ImplItem) -> hir::ImplItem {
self.with_parent_def(i.id, |this| {
let LoweredNodeId { node_id, hir_id } = this.lower_node_id(i.id);
let impl_item_def_id = this.resolver.definitions().local_def_id(node_id);
let LoweredNodeId { node_id, hir_id } = self.lower_node_id(i.id);
let impl_item_def_id = self.resolver.definitions().local_def_id(node_id);

let (generics, node) = match i.node {
ImplItemKind::Const(ref ty, ref expr) => {
let body_id = this.lower_body(None, |this| this.lower_expr(expr));
let body_id = self.lower_body(None, |this| this.lower_expr(expr));
(
this.lower_generics(&i.generics, ImplTraitContext::Disallowed),
self.lower_generics(&i.generics, ImplTraitContext::Disallowed),
hir::ImplItemKind::Const(
this.lower_ty(ty, ImplTraitContext::Disallowed),
self.lower_ty(ty, ImplTraitContext::Disallowed),
body_id,
),
)
}
ImplItemKind::Method(ref sig, ref body) => {
let body_id = this.lower_body(Some(&sig.decl), |this| {
let body_id = self.lower_body(Some(&sig.decl), |this| {
let body = this.lower_block(body, false);
this.expr_block(body, ThinVec::new())
});
let impl_trait_return_allow = !this.is_in_trait_impl;
let impl_trait_return_allow = !self.is_in_trait_impl;

this.add_in_band_defs(
self.add_in_band_defs(
&i.generics,
impl_item_def_id,
AnonymousLifetimeMode::PassThrough,
Expand All @@ -2596,24 +2572,23 @@ impl<'a> LoweringContext<'a> {
)
}
ImplItemKind::Type(ref ty) => (
this.lower_generics(&i.generics, ImplTraitContext::Disallowed),
hir::ImplItemKind::Type(this.lower_ty(ty, ImplTraitContext::Disallowed)),
self.lower_generics(&i.generics, ImplTraitContext::Disallowed),
hir::ImplItemKind::Type(self.lower_ty(ty, ImplTraitContext::Disallowed)),
),
ImplItemKind::Macro(..) => panic!("Shouldn't exist any more"),
};

hir::ImplItem {
id: node_id,
hir_id,
name: this.lower_ident(i.ident),
attrs: this.lower_attrs(&i.attrs),
name: self.lower_ident(i.ident),
attrs: self.lower_attrs(&i.attrs),
generics,
vis: this.lower_visibility(&i.vis, None),
defaultness: this.lower_defaultness(i.defaultness, true /* [1] */),
vis: self.lower_visibility(&i.vis, None),
defaultness: self.lower_defaultness(i.defaultness, true /* [1] */),
node,
span: i.span,
}
})

// [1] since `default impl` is not yet implemented, this is always true in impls
}
Expand Down Expand Up @@ -2689,9 +2664,7 @@ impl<'a> LoweringContext<'a> {
return None;
}

let node = self.with_parent_def(i.id, |this| {
this.lower_item_kind(i.id, &mut name, &attrs, &mut vis, &i.node)
});
let node = self.lower_item_kind(i.id, &mut name, &attrs, &mut vis, &i.node);

let LoweredNodeId { node_id, hir_id } = self.lower_node_id(i.id);

Expand All @@ -2707,16 +2680,15 @@ impl<'a> LoweringContext<'a> {
}

fn lower_foreign_item(&mut self, i: &ForeignItem) -> hir::ForeignItem {
self.with_parent_def(i.id, |this| {
let node_id = this.lower_node_id(i.id).node_id;
let def_id = this.resolver.definitions().local_def_id(node_id);
let node_id = self.lower_node_id(i.id).node_id;
let def_id = self.resolver.definitions().local_def_id(node_id);
hir::ForeignItem {
id: node_id,
name: i.ident.name,
attrs: this.lower_attrs(&i.attrs),
attrs: self.lower_attrs(&i.attrs),
node: match i.node {
ForeignItemKind::Fn(ref fdec, ref generics) => {
let (generics, (fn_dec, fn_args)) = this.add_in_band_defs(
let (generics, (fn_dec, fn_args)) = self.add_in_band_defs(
generics,
def_id,
AnonymousLifetimeMode::PassThrough,
Expand All @@ -2732,15 +2704,14 @@ impl<'a> LoweringContext<'a> {
hir::ForeignItemFn(fn_dec, fn_args, generics)
}
ForeignItemKind::Static(ref t, m) => {
hir::ForeignItemStatic(this.lower_ty(t, ImplTraitContext::Disallowed), m)
hir::ForeignItemStatic(self.lower_ty(t, ImplTraitContext::Disallowed), m)
}
ForeignItemKind::Ty => hir::ForeignItemType,
ForeignItemKind::Macro(_) => panic!("shouldn't exist here"),
},
vis: this.lower_visibility(&i.vis, None),
vis: self.lower_visibility(&i.vis, None),
span: i.span,
}
})
}

fn lower_method_sig(
Expand Down Expand Up @@ -3064,7 +3035,6 @@ impl<'a> LoweringContext<'a> {
),
ExprKind::Closure(capture_clause, movability, ref decl, ref body, fn_decl_span) => {
self.with_new_scopes(|this| {
this.with_parent_def(e.id, |this| {
let mut is_generator = false;
let body_id = this.lower_body(Some(decl), |this| {
let e = this.lower_expr(body);
Expand Down Expand Up @@ -3104,7 +3074,6 @@ impl<'a> LoweringContext<'a> {
generator_option,
)
})
})
}
ExprKind::Block(ref blk, opt_label) => {
hir::ExprBlock(self.lower_block(blk,
Expand Down