| use std::mem; |
| |
| use rustc_ast::visit::FnKind; |
| use rustc_ast::*; |
| use rustc_attr_parsing::{AttributeParser, Early, OmitDoc, ShouldEmit}; |
| use rustc_expand::expand::AstFragment; |
| use rustc_hir as hir; |
| use rustc_hir::def::{CtorKind, CtorOf, DefKind}; |
| use rustc_hir::def_id::LocalDefId; |
| use rustc_middle::span_bug; |
| use rustc_span::hygiene::LocalExpnId; |
| use rustc_span::{Span, Symbol, sym}; |
| use tracing::debug; |
| |
| use crate::{ImplTraitContext, InvocationParent, Resolver}; |
| |
| pub(crate) fn collect_definitions( |
| resolver: &mut Resolver<'_, '_>, |
| fragment: &AstFragment, |
| expansion: LocalExpnId, |
| ) { |
| let invocation_parent = resolver.invocation_parents[&expansion]; |
| let mut visitor = DefCollector { resolver, expansion, invocation_parent }; |
| fragment.visit_with(&mut visitor); |
| } |
| |
| /// Creates `DefId`s for nodes in the AST. |
| struct DefCollector<'a, 'ra, 'tcx> { |
| resolver: &'a mut Resolver<'ra, 'tcx>, |
| invocation_parent: InvocationParent, |
| expansion: LocalExpnId, |
| } |
| |
| impl<'a, 'ra, 'tcx> DefCollector<'a, 'ra, 'tcx> { |
| fn create_def( |
| &mut self, |
| node_id: NodeId, |
| name: Option<Symbol>, |
| def_kind: DefKind, |
| span: Span, |
| ) -> LocalDefId { |
| let parent_def = self.invocation_parent.parent_def; |
| debug!( |
| "create_def(node_id={:?}, def_kind={:?}, parent_def={:?})", |
| node_id, def_kind, parent_def |
| ); |
| self.resolver |
| .create_def( |
| parent_def, |
| node_id, |
| name, |
| def_kind, |
| self.expansion.to_expn_id(), |
| span.with_parent(None), |
| ) |
| .def_id() |
| } |
| |
| fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: LocalDefId, f: F) { |
| let orig_parent_def = mem::replace(&mut self.invocation_parent.parent_def, parent_def); |
| f(self); |
| self.invocation_parent.parent_def = orig_parent_def; |
| } |
| |
| fn with_impl_trait<F: FnOnce(&mut Self)>( |
| &mut self, |
| impl_trait_context: ImplTraitContext, |
| f: F, |
| ) { |
| let orig_itc = |
| mem::replace(&mut self.invocation_parent.impl_trait_context, impl_trait_context); |
| f(self); |
| self.invocation_parent.impl_trait_context = orig_itc; |
| } |
| |
| fn collect_field(&mut self, field: &'a FieldDef, index: Option<usize>) { |
| let index = |this: &Self| { |
| index.unwrap_or_else(|| { |
| let node_id = NodeId::placeholder_from_expn_id(this.expansion); |
| this.resolver.placeholder_field_indices[&node_id] |
| }) |
| }; |
| |
| if field.is_placeholder { |
| let old_index = self.resolver.placeholder_field_indices.insert(field.id, index(self)); |
| assert!(old_index.is_none(), "placeholder field index is reset for a node ID"); |
| self.visit_macro_invoc(field.id); |
| } else { |
| let name = field.ident.map_or_else(|| sym::integer(index(self)), |ident| ident.name); |
| let def = self.create_def(field.id, Some(name), DefKind::Field, field.span); |
| self.with_parent(def, |this| visit::walk_field_def(this, field)); |
| } |
| } |
| |
| fn visit_macro_invoc(&mut self, id: NodeId) { |
| let id = id.placeholder_to_expn_id(); |
| let old_parent = self.resolver.invocation_parents.insert(id, self.invocation_parent); |
| assert!(old_parent.is_none(), "parent `LocalDefId` is reset for an invocation"); |
| } |
| } |
| |
| impl<'a, 'ra, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'ra, 'tcx> { |
| fn visit_item(&mut self, i: &'a Item) { |
| // Pick the def data. This need not be unique, but the more |
| // information we encapsulate into, the better |
| let mut opt_macro_data = None; |
| let def_kind = match &i.kind { |
| ItemKind::Impl(i) => DefKind::Impl { of_trait: i.of_trait.is_some() }, |
| ItemKind::ForeignMod(..) => DefKind::ForeignMod, |
| ItemKind::Mod(..) => DefKind::Mod, |
| ItemKind::Trait(..) => DefKind::Trait, |
| ItemKind::TraitAlias(..) => DefKind::TraitAlias, |
| ItemKind::Enum(..) => DefKind::Enum, |
| ItemKind::Struct(..) => DefKind::Struct, |
| ItemKind::Union(..) => DefKind::Union, |
| ItemKind::ExternCrate(..) => DefKind::ExternCrate, |
| ItemKind::TyAlias(..) => DefKind::TyAlias, |
| ItemKind::Static(s) => DefKind::Static { |
| safety: hir::Safety::Safe, |
| mutability: s.mutability, |
| nested: false, |
| }, |
| ItemKind::Const(..) => DefKind::Const, |
| ItemKind::Fn(..) | ItemKind::Delegation(..) => DefKind::Fn, |
| ItemKind::MacroDef(ident, def) => { |
| let edition = i.span.edition(); |
| |
| // FIXME(jdonszelmann) make one of these in the resolver? |
| // FIXME(jdonszelmann) don't care about tools here maybe? Just parse what we can. |
| // Does that prevents errors from happening? maybe |
| let mut parser = AttributeParser::<'_, Early>::new( |
| &self.resolver.tcx.sess, |
| self.resolver.tcx.features(), |
| Vec::new(), |
| Early { emit_errors: ShouldEmit::Nothing }, |
| ); |
| let attrs = parser.parse_attribute_list( |
| &i.attrs, |
| i.span, |
| i.id, |
| OmitDoc::Skip, |
| std::convert::identity, |
| |_l| { |
| // FIXME(jdonszelmann): emit lints here properly |
| // NOTE that before new attribute parsing, they didn't happen either |
| // but it would be nice if we could change that. |
| }, |
| ); |
| |
| let macro_data = |
| self.resolver.compile_macro(def, *ident, &attrs, i.span, i.id, edition); |
| let macro_kind = macro_data.ext.macro_kind(); |
| opt_macro_data = Some(macro_data); |
| DefKind::Macro(macro_kind) |
| } |
| ItemKind::GlobalAsm(..) => DefKind::GlobalAsm, |
| ItemKind::Use(use_tree) => { |
| self.create_def(i.id, None, DefKind::Use, use_tree.span); |
| return visit::walk_item(self, i); |
| } |
| ItemKind::MacCall(..) | ItemKind::DelegationMac(..) => { |
| return self.visit_macro_invoc(i.id); |
| } |
| }; |
| let def_id = |
| self.create_def(i.id, i.kind.ident().map(|ident| ident.name), def_kind, i.span); |
| |
| if let Some(macro_data) = opt_macro_data { |
| self.resolver.new_local_macro(def_id, macro_data); |
| } |
| |
| self.with_parent(def_id, |this| { |
| this.with_impl_trait(ImplTraitContext::Existential, |this| { |
| match i.kind { |
| ItemKind::Struct(_, _, ref struct_def) |
| | ItemKind::Union(_, _, ref struct_def) => { |
| // If this is a unit or tuple-like struct, register the constructor. |
| if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(struct_def) { |
| this.create_def( |
| ctor_node_id, |
| None, |
| DefKind::Ctor(CtorOf::Struct, ctor_kind), |
| i.span, |
| ); |
| } |
| } |
| _ => {} |
| } |
| visit::walk_item(this, i); |
| }) |
| }); |
| } |
| |
| fn visit_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) { |
| match fn_kind { |
| FnKind::Fn( |
| _ctxt, |
| _vis, |
| Fn { |
| sig: FnSig { header, decl, span: _ }, ident, generics, contract, body, .. |
| }, |
| ) if let Some(coroutine_kind) = header.coroutine_kind => { |
| self.visit_ident(ident); |
| self.visit_fn_header(header); |
| self.visit_generics(generics); |
| if let Some(contract) = contract { |
| self.visit_contract(contract); |
| } |
| |
| // For async functions, we need to create their inner defs inside of a |
| // closure to match their desugared representation. Besides that, |
| // we must mirror everything that `visit::walk_fn` below does. |
| let FnDecl { inputs, output } = &**decl; |
| for param in inputs { |
| self.visit_param(param); |
| } |
| |
| let (return_id, return_span) = coroutine_kind.return_id(); |
| let return_def = self.create_def(return_id, None, DefKind::OpaqueTy, return_span); |
| self.with_parent(return_def, |this| this.visit_fn_ret_ty(output)); |
| |
| // If this async fn has no body (i.e. it's an async fn signature in a trait) |
| // then the closure_def will never be used, and we should avoid generating a |
| // def-id for it. |
| if let Some(body) = body { |
| let closure_def = |
| self.create_def(coroutine_kind.closure_id(), None, DefKind::Closure, span); |
| self.with_parent(closure_def, |this| this.visit_block(body)); |
| } |
| } |
| FnKind::Closure(binder, Some(coroutine_kind), decl, body) => { |
| self.visit_closure_binder(binder); |
| visit::walk_fn_decl(self, decl); |
| |
| // Async closures desugar to closures inside of closures, so |
| // we must create two defs. |
| let coroutine_def = |
| self.create_def(coroutine_kind.closure_id(), None, DefKind::Closure, span); |
| self.with_parent(coroutine_def, |this| this.visit_expr(body)); |
| } |
| _ => visit::walk_fn(self, fn_kind), |
| } |
| } |
| |
| fn visit_nested_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId) { |
| self.create_def(id, None, DefKind::Use, use_tree.span); |
| visit::walk_use_tree(self, use_tree); |
| } |
| |
| fn visit_foreign_item(&mut self, fi: &'a ForeignItem) { |
| let (ident, def_kind) = match fi.kind { |
| ForeignItemKind::Static(box StaticItem { |
| ident, |
| ty: _, |
| mutability, |
| expr: _, |
| safety, |
| define_opaque: _, |
| }) => { |
| let safety = match safety { |
| ast::Safety::Unsafe(_) | ast::Safety::Default => hir::Safety::Unsafe, |
| ast::Safety::Safe(_) => hir::Safety::Safe, |
| }; |
| |
| (ident, DefKind::Static { safety, mutability, nested: false }) |
| } |
| ForeignItemKind::Fn(box Fn { ident, .. }) => (ident, DefKind::Fn), |
| ForeignItemKind::TyAlias(box TyAlias { ident, .. }) => (ident, DefKind::ForeignTy), |
| ForeignItemKind::MacCall(_) => return self.visit_macro_invoc(fi.id), |
| }; |
| |
| let def = self.create_def(fi.id, Some(ident.name), def_kind, fi.span); |
| |
| self.with_parent(def, |this| visit::walk_item(this, fi)); |
| } |
| |
| fn visit_variant(&mut self, v: &'a Variant) { |
| if v.is_placeholder { |
| return self.visit_macro_invoc(v.id); |
| } |
| let def = self.create_def(v.id, Some(v.ident.name), DefKind::Variant, v.span); |
| self.with_parent(def, |this| { |
| if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(&v.data) { |
| this.create_def( |
| ctor_node_id, |
| None, |
| DefKind::Ctor(CtorOf::Variant, ctor_kind), |
| v.span, |
| ); |
| } |
| visit::walk_variant(this, v) |
| }); |
| } |
| |
| fn visit_where_predicate(&mut self, pred: &'a WherePredicate) { |
| if pred.is_placeholder { |
| self.visit_macro_invoc(pred.id) |
| } else { |
| visit::walk_where_predicate(self, pred) |
| } |
| } |
| |
| fn visit_variant_data(&mut self, data: &'a VariantData) { |
| // The assumption here is that non-`cfg` macro expansion cannot change field indices. |
| // It currently holds because only inert attributes are accepted on fields, |
| // and every such attribute expands into a single field after it's resolved. |
| for (index, field) in data.fields().iter().enumerate() { |
| self.collect_field(field, Some(index)); |
| } |
| } |
| |
| fn visit_generic_param(&mut self, param: &'a GenericParam) { |
| if param.is_placeholder { |
| self.visit_macro_invoc(param.id); |
| return; |
| } |
| let def_kind = match param.kind { |
| GenericParamKind::Lifetime { .. } => DefKind::LifetimeParam, |
| GenericParamKind::Type { .. } => DefKind::TyParam, |
| GenericParamKind::Const { .. } => DefKind::ConstParam, |
| }; |
| self.create_def(param.id, Some(param.ident.name), def_kind, param.ident.span); |
| |
| // impl-Trait can happen inside generic parameters, like |
| // ``` |
| // fn foo<U: Iterator<Item = impl Clone>>() {} |
| // ``` |
| // |
| // In that case, the impl-trait is lowered as an additional generic parameter. |
| self.with_impl_trait(ImplTraitContext::Universal, |this| { |
| visit::walk_generic_param(this, param) |
| }); |
| } |
| |
| fn visit_assoc_item(&mut self, i: &'a AssocItem, ctxt: visit::AssocCtxt) { |
| let (ident, def_kind) = match &i.kind { |
| AssocItemKind::Fn(box Fn { ident, .. }) |
| | AssocItemKind::Delegation(box Delegation { ident, .. }) => (*ident, DefKind::AssocFn), |
| AssocItemKind::Const(box ConstItem { ident, .. }) => (*ident, DefKind::AssocConst), |
| AssocItemKind::Type(box TyAlias { ident, .. }) => (*ident, DefKind::AssocTy), |
| AssocItemKind::MacCall(..) | AssocItemKind::DelegationMac(..) => { |
| return self.visit_macro_invoc(i.id); |
| } |
| }; |
| |
| let def = self.create_def(i.id, Some(ident.name), def_kind, i.span); |
| self.with_parent(def, |this| visit::walk_assoc_item(this, i, ctxt)); |
| } |
| |
| fn visit_pat(&mut self, pat: &'a Pat) { |
| match pat.kind { |
| PatKind::MacCall(..) => self.visit_macro_invoc(pat.id), |
| _ => visit::walk_pat(self, pat), |
| } |
| } |
| |
| fn visit_anon_const(&mut self, constant: &'a AnonConst) { |
| let parent = self.create_def(constant.id, None, DefKind::AnonConst, constant.value.span); |
| self.with_parent(parent, |this| visit::walk_anon_const(this, constant)); |
| } |
| |
| fn visit_expr(&mut self, expr: &'a Expr) { |
| let parent_def = match expr.kind { |
| ExprKind::MacCall(..) => return self.visit_macro_invoc(expr.id), |
| ExprKind::Closure(..) | ExprKind::Gen(..) => { |
| self.create_def(expr.id, None, DefKind::Closure, expr.span) |
| } |
| ExprKind::ConstBlock(ref constant) => { |
| for attr in &expr.attrs { |
| visit::walk_attribute(self, attr); |
| } |
| let def = |
| self.create_def(constant.id, None, DefKind::InlineConst, constant.value.span); |
| self.with_parent(def, |this| visit::walk_anon_const(this, constant)); |
| return; |
| } |
| _ => self.invocation_parent.parent_def, |
| }; |
| |
| self.with_parent(parent_def, |this| visit::walk_expr(this, expr)) |
| } |
| |
| fn visit_ty(&mut self, ty: &'a Ty) { |
| match ty.kind { |
| TyKind::MacCall(..) => self.visit_macro_invoc(ty.id), |
| TyKind::ImplTrait(opaque_id, _) => { |
| let name = *self |
| .resolver |
| .impl_trait_names |
| .get(&ty.id) |
| .unwrap_or_else(|| span_bug!(ty.span, "expected this opaque to be named")); |
| let kind = match self.invocation_parent.impl_trait_context { |
| ImplTraitContext::Universal => DefKind::TyParam, |
| ImplTraitContext::Existential => DefKind::OpaqueTy, |
| ImplTraitContext::InBinding => return visit::walk_ty(self, ty), |
| }; |
| let id = self.create_def(opaque_id, Some(name), kind, ty.span); |
| match self.invocation_parent.impl_trait_context { |
| // Do not nest APIT, as we desugar them as `impl_trait: bounds`, |
| // so the `impl_trait` node is not a parent to `bounds`. |
| ImplTraitContext::Universal => visit::walk_ty(self, ty), |
| ImplTraitContext::Existential => { |
| self.with_parent(id, |this| visit::walk_ty(this, ty)) |
| } |
| ImplTraitContext::InBinding => unreachable!(), |
| }; |
| } |
| _ => visit::walk_ty(self, ty), |
| } |
| } |
| |
| fn visit_stmt(&mut self, stmt: &'a Stmt) { |
| match stmt.kind { |
| StmtKind::MacCall(..) => self.visit_macro_invoc(stmt.id), |
| // FIXME(impl_trait_in_bindings): We don't really have a good way of |
| // introducing the right `ImplTraitContext` here for all the cases we |
| // care about, in case we want to introduce ITIB to other positions |
| // such as turbofishes (e.g. `foo::<impl Fn()>(|| {})`). |
| StmtKind::Let(ref local) => self.with_impl_trait(ImplTraitContext::InBinding, |this| { |
| visit::walk_local(this, local) |
| }), |
| _ => visit::walk_stmt(self, stmt), |
| } |
| } |
| |
| fn visit_arm(&mut self, arm: &'a Arm) { |
| if arm.is_placeholder { self.visit_macro_invoc(arm.id) } else { visit::walk_arm(self, arm) } |
| } |
| |
| fn visit_expr_field(&mut self, f: &'a ExprField) { |
| if f.is_placeholder { |
| self.visit_macro_invoc(f.id) |
| } else { |
| visit::walk_expr_field(self, f) |
| } |
| } |
| |
| fn visit_pat_field(&mut self, fp: &'a PatField) { |
| if fp.is_placeholder { |
| self.visit_macro_invoc(fp.id) |
| } else { |
| visit::walk_pat_field(self, fp) |
| } |
| } |
| |
| fn visit_param(&mut self, p: &'a Param) { |
| if p.is_placeholder { |
| self.visit_macro_invoc(p.id) |
| } else { |
| self.with_impl_trait(ImplTraitContext::Universal, |this| visit::walk_param(this, p)) |
| } |
| } |
| |
| // This method is called only when we are visiting an individual field |
| // after expanding an attribute on it. |
| fn visit_field_def(&mut self, field: &'a FieldDef) { |
| self.collect_field(field, None); |
| } |
| |
| 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), |
| } |
| } |
| } |
| } |
