356 lines
13 KiB
Rust
356 lines
13 KiB
Rust
use log::debug;
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use rustc::hir::map::definitions::*;
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use rustc::hir::def_id::DefIndex;
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use syntax::ast::*;
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use syntax::visit;
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use syntax::symbol::{kw, sym};
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use syntax::token::{self, Token};
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use syntax_expand::expand::AstFragment;
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use syntax_pos::hygiene::ExpnId;
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use syntax_pos::Span;
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crate fn collect_definitions(
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definitions: &mut Definitions,
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fragment: &AstFragment,
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expansion: ExpnId,
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) {
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let parent_def = definitions.invocation_parent(expansion);
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fragment.visit_with(&mut DefCollector { definitions, parent_def, expansion });
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}
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/// Creates `DefId`s for nodes in the AST.
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struct DefCollector<'a> {
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definitions: &'a mut Definitions,
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parent_def: DefIndex,
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expansion: ExpnId,
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}
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impl<'a> DefCollector<'a> {
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fn create_def(&mut self,
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node_id: NodeId,
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data: DefPathData,
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span: Span)
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-> DefIndex {
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let parent_def = self.parent_def;
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debug!("create_def(node_id={:?}, data={:?}, parent_def={:?})", node_id, data, parent_def);
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self.definitions.create_def_with_parent(parent_def, node_id, data, self.expansion, span)
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}
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fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: DefIndex, f: F) {
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let orig_parent_def = std::mem::replace(&mut self.parent_def, parent_def);
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f(self);
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self.parent_def = orig_parent_def;
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}
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fn visit_async_fn(
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&mut self,
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id: NodeId,
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name: Name,
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span: Span,
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header: &FnHeader,
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generics: &'a Generics,
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decl: &'a FnDecl,
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body: Option<&'a Block>,
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) {
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let (closure_id, return_impl_trait_id) = match header.asyncness.node {
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IsAsync::Async {
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closure_id,
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return_impl_trait_id,
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} => (closure_id, return_impl_trait_id),
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_ => unreachable!(),
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};
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// For async functions, we need to create their inner defs inside of a
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// closure to match their desugared representation.
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let fn_def_data = DefPathData::ValueNs(name);
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let fn_def = self.create_def(id, fn_def_data, span);
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return self.with_parent(fn_def, |this| {
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this.create_def(return_impl_trait_id, DefPathData::ImplTrait, span);
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visit::walk_generics(this, generics);
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visit::walk_fn_decl(this, decl);
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let closure_def = this.create_def(
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closure_id, DefPathData::ClosureExpr, span,
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);
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this.with_parent(closure_def, |this| {
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if let Some(body) = body {
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visit::walk_block(this, body);
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}
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})
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})
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}
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fn collect_field(&mut self, field: &'a StructField, index: Option<usize>) {
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let index = |this: &Self| index.unwrap_or_else(|| {
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let node_id = NodeId::placeholder_from_expn_id(this.expansion);
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this.definitions.placeholder_field_index(node_id)
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});
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if field.is_placeholder {
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self.definitions.set_placeholder_field_index(field.id, index(self));
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self.visit_macro_invoc(field.id);
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} else {
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let name = field.ident.map_or_else(|| sym::integer(index(self)), |ident| ident.name);
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let def = self.create_def(field.id, DefPathData::ValueNs(name), field.span);
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self.with_parent(def, |this| visit::walk_struct_field(this, field));
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}
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}
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fn visit_macro_invoc(&mut self, id: NodeId) {
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self.definitions.set_invocation_parent(id.placeholder_to_expn_id(), self.parent_def);
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}
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}
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impl<'a> visit::Visitor<'a> for DefCollector<'a> {
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fn visit_item(&mut self, i: &'a Item) {
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debug!("visit_item: {:?}", i);
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// Pick the def data. This need not be unique, but the more
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// information we encapsulate into, the better
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let def_data = match &i.kind {
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ItemKind::Impl(..) => DefPathData::Impl,
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ItemKind::Mod(..) if i.ident.name == kw::Invalid => {
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return visit::walk_item(self, i);
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}
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ItemKind::Mod(..) | ItemKind::Trait(..) | ItemKind::TraitAlias(..) |
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ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) |
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ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) |
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ItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name),
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ItemKind::Fn(sig, generics, body) if sig.header.asyncness.node.is_async() => {
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return self.visit_async_fn(
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i.id,
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i.ident.name,
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i.span,
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&sig.header,
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generics,
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&sig.decl,
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Some(body),
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)
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}
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ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) =>
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DefPathData::ValueNs(i.ident.name),
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ItemKind::MacroDef(..) => DefPathData::MacroNs(i.ident.name),
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ItemKind::Mac(..) => return self.visit_macro_invoc(i.id),
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ItemKind::GlobalAsm(..) => DefPathData::Misc,
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ItemKind::Use(..) => {
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return visit::walk_item(self, i);
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}
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};
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let def = self.create_def(i.id, def_data, i.span);
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self.with_parent(def, |this| {
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match i.kind {
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ItemKind::Struct(ref struct_def, _) | ItemKind::Union(ref struct_def, _) => {
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// If this is a unit or tuple-like struct, register the constructor.
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if let Some(ctor_hir_id) = struct_def.ctor_id() {
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this.create_def(ctor_hir_id, DefPathData::Ctor, i.span);
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}
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}
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_ => {}
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}
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visit::walk_item(this, i);
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});
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}
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fn visit_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId, _nested: bool) {
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self.create_def(id, DefPathData::Misc, use_tree.span);
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visit::walk_use_tree(self, use_tree, id);
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}
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fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) {
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if let ForeignItemKind::Macro(_) = foreign_item.kind {
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return self.visit_macro_invoc(foreign_item.id);
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}
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let def = self.create_def(foreign_item.id,
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DefPathData::ValueNs(foreign_item.ident.name),
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foreign_item.span);
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self.with_parent(def, |this| {
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visit::walk_foreign_item(this, foreign_item);
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});
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}
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fn visit_variant(&mut self, v: &'a Variant) {
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if v.is_placeholder {
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return self.visit_macro_invoc(v.id);
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}
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let def = self.create_def(v.id,
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DefPathData::TypeNs(v.ident.name),
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v.span);
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self.with_parent(def, |this| {
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if let Some(ctor_hir_id) = v.data.ctor_id() {
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this.create_def(ctor_hir_id, DefPathData::Ctor, v.span);
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}
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visit::walk_variant(this, v)
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});
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}
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fn visit_variant_data(&mut self, data: &'a VariantData) {
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// The assumption here is that non-`cfg` macro expansion cannot change field indices.
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// It currently holds because only inert attributes are accepted on fields,
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// and every such attribute expands into a single field after it's resolved.
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for (index, field) in data.fields().iter().enumerate() {
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self.collect_field(field, Some(index));
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}
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}
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fn visit_generic_param(&mut self, param: &'a GenericParam) {
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if param.is_placeholder {
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self.visit_macro_invoc(param.id);
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return;
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}
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let name = param.ident.name;
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let def_path_data = match param.kind {
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GenericParamKind::Lifetime { .. } => DefPathData::LifetimeNs(name),
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GenericParamKind::Type { .. } => DefPathData::TypeNs(name),
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GenericParamKind::Const { .. } => DefPathData::ValueNs(name),
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};
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self.create_def(param.id, def_path_data, param.ident.span);
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visit::walk_generic_param(self, param);
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}
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fn visit_trait_item(&mut self, ti: &'a TraitItem) {
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let def_data = match ti.kind {
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TraitItemKind::Method(..) | TraitItemKind::Const(..) =>
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DefPathData::ValueNs(ti.ident.name),
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TraitItemKind::TyAlias(..) => {
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DefPathData::TypeNs(ti.ident.name)
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},
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TraitItemKind::Macro(..) => return self.visit_macro_invoc(ti.id),
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};
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let def = self.create_def(ti.id, def_data, ti.span);
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self.with_parent(def, |this| visit::walk_assoc_item(this, ti));
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}
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fn visit_impl_item(&mut self, ii: &'a ImplItem) {
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let def_data = match ii.kind {
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ImplItemKind::Method(FnSig {
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ref header,
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ref decl,
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}, ref body) if header.asyncness.node.is_async() => {
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return self.visit_async_fn(
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ii.id,
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ii.ident.name,
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ii.span,
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header,
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&ii.generics,
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decl,
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body.as_deref(),
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)
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}
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ImplItemKind::Method(..) |
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ImplItemKind::Const(..) => DefPathData::ValueNs(ii.ident.name),
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ImplItemKind::TyAlias(..) => DefPathData::TypeNs(ii.ident.name),
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ImplItemKind::Macro(..) => return self.visit_macro_invoc(ii.id),
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};
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let def = self.create_def(ii.id, def_data, ii.span);
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self.with_parent(def, |this| visit::walk_assoc_item(this, ii));
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}
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fn visit_pat(&mut self, pat: &'a Pat) {
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match pat.kind {
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PatKind::Mac(..) => return self.visit_macro_invoc(pat.id),
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_ => visit::walk_pat(self, pat),
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}
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}
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fn visit_anon_const(&mut self, constant: &'a AnonConst) {
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let def = self.create_def(constant.id,
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DefPathData::AnonConst,
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constant.value.span);
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self.with_parent(def, |this| visit::walk_anon_const(this, constant));
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}
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fn visit_expr(&mut self, expr: &'a Expr) {
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let parent_def = match expr.kind {
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ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id),
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ExprKind::Closure(_, asyncness, ..) => {
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// Async closures desugar to closures inside of closures, so
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// we must create two defs.
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let closure_def = self.create_def(expr.id, DefPathData::ClosureExpr, expr.span);
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match asyncness {
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IsAsync::Async { closure_id, .. } =>
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self.create_def(closure_id, DefPathData::ClosureExpr, expr.span),
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IsAsync::NotAsync => closure_def,
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}
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}
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ExprKind::Async(_, async_id, _) =>
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self.create_def(async_id, DefPathData::ClosureExpr, expr.span),
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_ => self.parent_def,
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};
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self.with_parent(parent_def, |this| visit::walk_expr(this, expr));
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}
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fn visit_ty(&mut self, ty: &'a Ty) {
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match ty.kind {
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TyKind::Mac(..) => return self.visit_macro_invoc(ty.id),
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TyKind::ImplTrait(node_id, _) => {
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self.create_def(node_id, DefPathData::ImplTrait, ty.span);
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}
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_ => {}
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}
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visit::walk_ty(self, ty);
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}
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fn visit_stmt(&mut self, stmt: &'a Stmt) {
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match stmt.kind {
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StmtKind::Mac(..) => self.visit_macro_invoc(stmt.id),
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_ => visit::walk_stmt(self, stmt),
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}
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}
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fn visit_token(&mut self, t: Token) {
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if let token::Interpolated(nt) = t.kind {
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if let token::NtExpr(ref expr) = *nt {
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if let ExprKind::Mac(..) = expr.kind {
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self.visit_macro_invoc(expr.id);
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}
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}
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}
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}
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fn visit_arm(&mut self, arm: &'a Arm) {
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if arm.is_placeholder {
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self.visit_macro_invoc(arm.id)
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} else {
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visit::walk_arm(self, arm)
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}
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}
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fn visit_field(&mut self, f: &'a Field) {
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if f.is_placeholder {
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self.visit_macro_invoc(f.id)
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} else {
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visit::walk_field(self, f)
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}
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}
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fn visit_field_pattern(&mut self, fp: &'a FieldPat) {
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if fp.is_placeholder {
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self.visit_macro_invoc(fp.id)
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} else {
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visit::walk_field_pattern(self, fp)
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}
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}
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fn visit_param(&mut self, p: &'a Param) {
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if p.is_placeholder {
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self.visit_macro_invoc(p.id)
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} else {
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visit::walk_param(self, p)
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}
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}
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// This method is called only when we are visiting an individual field
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// after expanding an attribute on it.
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fn visit_struct_field(&mut self, field: &'a StructField) {
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self.collect_field(field, None);
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}
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}
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