502 lines
20 KiB
Rust
502 lines
20 KiB
Rust
use std::mem;
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use rustc_ast::visit::FnKind;
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use rustc_ast::*;
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use rustc_ast_pretty::pprust;
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use rustc_attr_parsing::{AttributeParser, OmitDoc};
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use rustc_expand::expand::AstFragment;
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use rustc_hir as hir;
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use rustc_hir::def::{CtorKind, CtorOf, DefKind};
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use rustc_hir::def_id::LocalDefId;
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use rustc_span::hygiene::LocalExpnId;
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use rustc_span::{Span, Symbol, sym};
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use tracing::debug;
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use crate::{ImplTraitContext, InvocationParent, Resolver};
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pub(crate) fn collect_definitions(
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resolver: &mut Resolver<'_, '_>,
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fragment: &AstFragment,
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expansion: LocalExpnId,
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) {
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let invocation_parent = resolver.invocation_parents[&expansion];
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let mut visitor = DefCollector { resolver, expansion, invocation_parent };
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fragment.visit_with(&mut visitor);
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}
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/// Creates `DefId`s for nodes in the AST.
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struct DefCollector<'a, 'ra, 'tcx> {
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resolver: &'a mut Resolver<'ra, 'tcx>,
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invocation_parent: InvocationParent,
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expansion: LocalExpnId,
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}
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impl<'a, 'ra, 'tcx> DefCollector<'a, 'ra, 'tcx> {
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fn create_def(
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&mut self,
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node_id: NodeId,
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name: Option<Symbol>,
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def_kind: DefKind,
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span: Span,
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) -> LocalDefId {
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let parent_def = self.invocation_parent.parent_def;
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debug!(
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"create_def(node_id={:?}, def_kind={:?}, parent_def={:?})",
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node_id, def_kind, parent_def
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);
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self.resolver
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.create_def(
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parent_def,
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node_id,
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name,
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def_kind,
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self.expansion.to_expn_id(),
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span.with_parent(None),
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)
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.def_id()
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}
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fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: LocalDefId, f: F) {
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let orig_parent_def = mem::replace(&mut self.invocation_parent.parent_def, parent_def);
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f(self);
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self.invocation_parent.parent_def = orig_parent_def;
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}
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fn with_impl_trait<F: FnOnce(&mut Self)>(
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&mut self,
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impl_trait_context: ImplTraitContext,
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f: F,
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) {
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let orig_itc =
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mem::replace(&mut self.invocation_parent.impl_trait_context, impl_trait_context);
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f(self);
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self.invocation_parent.impl_trait_context = orig_itc;
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}
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fn collect_field(&mut self, field: &'a FieldDef, index: Option<usize>) {
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let index = |this: &Self| {
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index.unwrap_or_else(|| {
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let node_id = NodeId::placeholder_from_expn_id(this.expansion);
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this.resolver.placeholder_field_indices[&node_id]
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})
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};
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if field.is_placeholder {
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let old_index = self.resolver.placeholder_field_indices.insert(field.id, index(self));
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assert!(old_index.is_none(), "placeholder field index is reset for a node ID");
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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, Some(name), DefKind::Field, field.span);
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self.with_parent(def, |this| visit::walk_field_def(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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let id = id.placeholder_to_expn_id();
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let old_parent = self.resolver.invocation_parents.insert(id, self.invocation_parent);
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assert!(old_parent.is_none(), "parent `LocalDefId` is reset for an invocation");
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}
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}
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impl<'a, 'ra, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'ra, 'tcx> {
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fn visit_item(&mut self, i: &'a Item) {
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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 mut opt_macro_data = None;
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let def_kind = match &i.kind {
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ItemKind::Impl(i) => DefKind::Impl { of_trait: i.of_trait.is_some() },
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ItemKind::ForeignMod(..) => DefKind::ForeignMod,
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ItemKind::Mod(..) => DefKind::Mod,
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ItemKind::Trait(..) => DefKind::Trait,
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ItemKind::TraitAlias(..) => DefKind::TraitAlias,
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ItemKind::Enum(..) => DefKind::Enum,
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ItemKind::Struct(..) => DefKind::Struct,
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ItemKind::Union(..) => DefKind::Union,
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ItemKind::ExternCrate(..) => DefKind::ExternCrate,
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ItemKind::TyAlias(..) => DefKind::TyAlias,
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ItemKind::Static(s) => DefKind::Static {
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safety: hir::Safety::Safe,
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mutability: s.mutability,
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nested: false,
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},
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ItemKind::Const(..) => DefKind::Const,
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ItemKind::Fn(..) | ItemKind::Delegation(..) => DefKind::Fn,
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ItemKind::MacroDef(ident, def) => {
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let edition = i.span.edition();
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// FIXME(jdonszelmann) make one of these in the resolver?
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// FIXME(jdonszelmann) don't care about tools here maybe? Just parse what we can.
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// Does that prevents errors from happening? maybe
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let parser = AttributeParser::new(
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&self.resolver.tcx.sess,
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self.resolver.tcx.features(),
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Vec::new(),
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);
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let attrs = parser.parse_attribute_list(
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&i.attrs,
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i.span,
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OmitDoc::Skip,
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std::convert::identity,
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);
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let macro_data =
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self.resolver.compile_macro(def, *ident, &attrs, i.span, i.id, edition);
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let macro_kind = macro_data.ext.macro_kind();
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opt_macro_data = Some(macro_data);
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DefKind::Macro(macro_kind)
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}
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ItemKind::GlobalAsm(..) => DefKind::GlobalAsm,
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ItemKind::Use(..) => return visit::walk_item(self, i),
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ItemKind::MacCall(..) | ItemKind::DelegationMac(..) => {
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return self.visit_macro_invoc(i.id);
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}
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};
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let def_id =
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self.create_def(i.id, i.kind.ident().map(|ident| ident.name), def_kind, i.span);
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if let Some(macro_data) = opt_macro_data {
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self.resolver.macro_map.insert(def_id.to_def_id(), macro_data);
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}
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self.with_parent(def_id, |this| {
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this.with_impl_trait(ImplTraitContext::Existential, |this| {
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match i.kind {
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ItemKind::Struct(_, ref struct_def, _)
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| 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_kind, ctor_node_id)) = CtorKind::from_ast(struct_def) {
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this.create_def(
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ctor_node_id,
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None,
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DefKind::Ctor(CtorOf::Struct, ctor_kind),
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i.span,
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);
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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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}
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fn visit_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) {
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match fn_kind {
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FnKind::Fn(
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_ctxt,
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_vis,
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Fn {
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sig: FnSig { header, decl, span: _ }, ident, generics, contract, body, ..
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},
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) if let Some(coroutine_kind) = header.coroutine_kind => {
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self.visit_ident(ident);
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self.visit_fn_header(header);
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self.visit_generics(generics);
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if let Some(contract) = contract {
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self.visit_contract(contract);
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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. Besides that,
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// we must mirror everything that `visit::walk_fn` below does.
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let FnDecl { inputs, output } = &**decl;
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for param in inputs {
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self.visit_param(param);
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}
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let (return_id, return_span) = coroutine_kind.return_id();
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let return_def = self.create_def(return_id, None, DefKind::OpaqueTy, return_span);
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self.with_parent(return_def, |this| this.visit_fn_ret_ty(output));
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// If this async fn has no body (i.e. it's an async fn signature in a trait)
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// then the closure_def will never be used, and we should avoid generating a
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// def-id for it.
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if let Some(body) = body {
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let closure_def =
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self.create_def(coroutine_kind.closure_id(), None, DefKind::Closure, span);
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self.with_parent(closure_def, |this| this.visit_block(body));
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}
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}
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FnKind::Closure(binder, Some(coroutine_kind), decl, body) => {
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self.visit_closure_binder(binder);
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visit::walk_fn_decl(self, decl);
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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 coroutine_def =
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self.create_def(coroutine_kind.closure_id(), None, DefKind::Closure, span);
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self.with_parent(coroutine_def, |this| this.visit_expr(body));
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}
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_ => visit::walk_fn(self, fn_kind),
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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, None, DefKind::Use, 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, fi: &'a ForeignItem) {
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let (ident, def_kind) = match fi.kind {
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ForeignItemKind::Static(box StaticItem {
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ident,
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ty: _,
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mutability,
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expr: _,
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safety,
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define_opaque: _,
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}) => {
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let safety = match safety {
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ast::Safety::Unsafe(_) | ast::Safety::Default => hir::Safety::Unsafe,
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ast::Safety::Safe(_) => hir::Safety::Safe,
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};
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(ident, DefKind::Static { safety, mutability, nested: false })
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}
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ForeignItemKind::Fn(box Fn { ident, .. }) => (ident, DefKind::Fn),
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ForeignItemKind::TyAlias(box TyAlias { ident, .. }) => (ident, DefKind::ForeignTy),
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ForeignItemKind::MacCall(_) => return self.visit_macro_invoc(fi.id),
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};
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let def = self.create_def(fi.id, Some(ident.name), def_kind, fi.span);
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self.with_parent(def, |this| visit::walk_item(this, fi));
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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, Some(v.ident.name), DefKind::Variant, v.span);
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self.with_parent(def, |this| {
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if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(&v.data) {
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this.create_def(
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ctor_node_id,
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None,
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DefKind::Ctor(CtorOf::Variant, ctor_kind),
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v.span,
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);
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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_where_predicate(&mut self, pred: &'a WherePredicate) {
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if pred.is_placeholder {
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self.visit_macro_invoc(pred.id)
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} else {
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visit::walk_where_predicate(self, pred)
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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 def_kind = match param.kind {
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GenericParamKind::Lifetime { .. } => DefKind::LifetimeParam,
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GenericParamKind::Type { .. } => DefKind::TyParam,
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GenericParamKind::Const { .. } => DefKind::ConstParam,
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};
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self.create_def(param.id, Some(param.ident.name), def_kind, param.ident.span);
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// impl-Trait can happen inside generic parameters, like
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// ```
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// fn foo<U: Iterator<Item = impl Clone>>() {}
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// ```
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//
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// In that case, the impl-trait is lowered as an additional generic parameter.
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self.with_impl_trait(ImplTraitContext::Universal, |this| {
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visit::walk_generic_param(this, param)
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});
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}
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fn visit_assoc_item(&mut self, i: &'a AssocItem, ctxt: visit::AssocCtxt) {
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let (ident, def_kind) = match &i.kind {
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AssocItemKind::Fn(box Fn { ident, .. })
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| AssocItemKind::Delegation(box Delegation { ident, .. }) => (*ident, DefKind::AssocFn),
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AssocItemKind::Const(box ConstItem { ident, .. }) => (*ident, DefKind::AssocConst),
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AssocItemKind::Type(box TyAlias { ident, .. }) => (*ident, DefKind::AssocTy),
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AssocItemKind::MacCall(..) | AssocItemKind::DelegationMac(..) => {
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return self.visit_macro_invoc(i.id);
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}
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};
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let def = self.create_def(i.id, Some(ident.name), def_kind, i.span);
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self.with_parent(def, |this| visit::walk_assoc_item(this, i, ctxt));
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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::MacCall(..) => 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 parent = self.create_def(constant.id, None, DefKind::AnonConst, constant.value.span);
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self.with_parent(parent, |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::MacCall(..) => return self.visit_macro_invoc(expr.id),
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ExprKind::Closure(..) | ExprKind::Gen(..) => {
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self.create_def(expr.id, None, DefKind::Closure, expr.span)
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}
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ExprKind::ConstBlock(ref constant) => {
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for attr in &expr.attrs {
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visit::walk_attribute(self, attr);
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}
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let def =
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self.create_def(constant.id, None, DefKind::InlineConst, constant.value.span);
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self.with_parent(def, |this| visit::walk_anon_const(this, constant));
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return;
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}
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_ => self.invocation_parent.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::MacCall(..) => self.visit_macro_invoc(ty.id),
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TyKind::ImplTrait(id, _) => {
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// HACK: pprust breaks strings with newlines when the type
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// gets too long. We don't want these to show up in compiler
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// output or built artifacts, so replace them here...
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// Perhaps we should instead format APITs more robustly.
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let name = Symbol::intern(&pprust::ty_to_string(ty).replace('\n', " "));
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let kind = match self.invocation_parent.impl_trait_context {
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ImplTraitContext::Universal => DefKind::TyParam,
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ImplTraitContext::Existential => DefKind::OpaqueTy,
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ImplTraitContext::InBinding => return visit::walk_ty(self, ty),
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};
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let id = self.create_def(*id, Some(name), kind, ty.span);
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match self.invocation_parent.impl_trait_context {
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// Do not nest APIT, as we desugar them as `impl_trait: bounds`,
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// so the `impl_trait` node is not a parent to `bounds`.
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ImplTraitContext::Universal => visit::walk_ty(self, ty),
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ImplTraitContext::Existential => {
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self.with_parent(id, |this| visit::walk_ty(this, ty))
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}
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ImplTraitContext::InBinding => unreachable!(),
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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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}
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fn visit_stmt(&mut self, stmt: &'a Stmt) {
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match stmt.kind {
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StmtKind::MacCall(..) => self.visit_macro_invoc(stmt.id),
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// FIXME(impl_trait_in_bindings): We don't really have a good way of
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// introducing the right `ImplTraitContext` here for all the cases we
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// care about, in case we want to introduce ITIB to other positions
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// such as turbofishes (e.g. `foo::<impl Fn()>(|| {})`).
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StmtKind::Let(ref local) => self.with_impl_trait(ImplTraitContext::InBinding, |this| {
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visit::walk_local(this, local)
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}),
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_ => visit::walk_stmt(self, stmt),
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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 { self.visit_macro_invoc(arm.id) } else { visit::walk_arm(self, arm) }
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}
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fn visit_expr_field(&mut self, f: &'a ExprField) {
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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_expr_field(self, f)
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}
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}
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fn visit_pat_field(&mut self, fp: &'a PatField) {
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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_pat_field(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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self.with_impl_trait(ImplTraitContext::Universal, |this| visit::walk_param(this, 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_field_def(&mut self, field: &'a FieldDef) {
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self.collect_field(field, None);
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}
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fn visit_crate(&mut self, krate: &'a Crate) {
|
|
if krate.is_placeholder {
|
|
self.visit_macro_invoc(krate.id)
|
|
} else {
|
|
visit::walk_crate(self, krate)
|
|
}
|
|
}
|
|
|
|
fn visit_attribute(&mut self, attr: &'a Attribute) -> Self::Result {
|
|
let orig_in_attr = mem::replace(&mut self.invocation_parent.in_attr, true);
|
|
visit::walk_attribute(self, attr);
|
|
self.invocation_parent.in_attr = orig_in_attr;
|
|
}
|
|
|
|
fn visit_inline_asm(&mut self, asm: &'a InlineAsm) {
|
|
let InlineAsm {
|
|
asm_macro: _,
|
|
template: _,
|
|
template_strs: _,
|
|
operands,
|
|
clobber_abis: _,
|
|
options: _,
|
|
line_spans: _,
|
|
} = asm;
|
|
for (op, _span) in operands {
|
|
match op {
|
|
InlineAsmOperand::In { expr, reg: _ }
|
|
| InlineAsmOperand::Out { expr: Some(expr), reg: _, late: _ }
|
|
| InlineAsmOperand::InOut { expr, reg: _, late: _ } => {
|
|
self.visit_expr(expr);
|
|
}
|
|
InlineAsmOperand::Out { expr: None, reg: _, late: _ } => {}
|
|
InlineAsmOperand::SplitInOut { in_expr, out_expr, reg: _, late: _ } => {
|
|
self.visit_expr(in_expr);
|
|
if let Some(expr) = out_expr {
|
|
self.visit_expr(expr);
|
|
}
|
|
}
|
|
InlineAsmOperand::Const { anon_const } => {
|
|
let def = self.create_def(
|
|
anon_const.id,
|
|
None,
|
|
DefKind::InlineConst,
|
|
anon_const.value.span,
|
|
);
|
|
self.with_parent(def, |this| visit::walk_anon_const(this, anon_const));
|
|
}
|
|
InlineAsmOperand::Sym { sym } => self.visit_inline_asm_sym(sym),
|
|
InlineAsmOperand::Label { block } => self.visit_block(block),
|
|
}
|
|
}
|
|
}
|
|
}
|