hygiene: Merge ExpnInfo and InternalExpnData

Author: petrochenkov

src/librustc/hir/lowering.rs

@@ -704,7 +704,7 @@ impl<'a> LoweringContext<'a> {
         span: Span,
         allow_internal_unstable: Option<Lrc<[Symbol]>>,
     ) -> Span {
-        span.fresh_expansion(ExpnId::root(), ExpnInfo {
+        span.fresh_expansion(ExpnInfo {
             def_site: span,
             allow_internal_unstable,
             ..ExpnInfo::default(ExpnKind::Desugaring(reason), span, self.sess.edition())

src/librustc/ich/impls_syntax.rs

@@ -398,8 +398,9 @@ impl_stable_hash_for!(enum ::syntax_pos::hygiene::Transparency {
 });
 
 impl_stable_hash_for!(struct ::syntax_pos::hygiene::ExpnInfo {
-    call_site,
     kind,
+    parent -> _,
+    call_site,
     def_site,
     default_transparency,
     allow_internal_unstable,

src/librustc/ty/query/on_disk_cache.rs

@@ -588,13 +588,13 @@ impl<'a, 'tcx> SpecializedDecoder<Span> for CacheDecoder<'a, 'tcx> {
 
         let expn_info_tag = u8::decode(self)?;
 
-        // FIXME(mw): This method does not restore `InternalExpnData::parent` or
+        // FIXME(mw): This method does not restore `ExpnInfo::parent` or
         // `SyntaxContextData::prev_ctxt` or `SyntaxContextData::opaque`. These things
         // don't seem to be used after HIR lowering, so everything should be fine
         // as long as incremental compilation does not kick in before that.
         let location = || Span::with_root_ctxt(lo, hi);
         let recover_from_expn_info = |this: &Self, expn_info, pos| {
-            let span = location().fresh_expansion(ExpnId::root(), expn_info);
+            let span = location().fresh_expansion(expn_info);
             this.synthetic_expansion_infos.borrow_mut().insert(pos, span.ctxt());
             span
         };

src/librustc_resolve/macros.rs

@@ -97,7 +97,7 @@ impl<'a> base::Resolver for Resolver<'a> {
     }
 
     fn get_module_scope(&mut self, id: ast::NodeId) -> ExpnId {
-        let expn_id = ExpnId::fresh(ExpnId::root(), Some(ExpnInfo::default(
+        let expn_id = ExpnId::fresh(Some(ExpnInfo::default(
             ExpnKind::Macro(MacroKind::Attr, sym::test_case), DUMMY_SP, self.session.edition()
         )));
         let module = self.module_map[&self.definitions.local_def_id(id)];
@@ -120,7 +120,8 @@ impl<'a> base::Resolver for Resolver<'a> {
         &mut self, expansion: ExpnId, fragment: &AstFragment, derives: &[ExpnId]
     ) {
         // Fill in some data for derives if the fragment is from a derive container.
-        let parent_scope = self.invocation_parent_scopes[&expansion];
+        // We are inside the `expansion` now, but other parent scope components are still the same.
+        let parent_scope = ParentScope { expansion, ..self.invocation_parent_scopes[&expansion] };
         let parent_def = self.definitions.invocation_parent(expansion);
         self.invocation_parent_scopes.extend(derives.iter().map(|&derive| (derive, parent_scope)));
         for &derive_invoc_id in derives {
@@ -130,9 +131,7 @@ impl<'a> base::Resolver for Resolver<'a> {
         parent_scope.module.unresolved_invocations.borrow_mut().extend(derives);
 
         // Integrate the new AST fragment into all the definition and module structures.
-        // We are inside the `expansion` new, but other parent scope components are still the same.
         fragment.visit_with(&mut DefCollector::new(&mut self.definitions, expansion));
-        let parent_scope = ParentScope { expansion, ..parent_scope };
         let output_legacy_scope = self.build_reduced_graph(fragment, parent_scope);
         self.output_legacy_scopes.insert(expansion, output_legacy_scope);
     }
@@ -186,7 +185,9 @@ impl<'a> base::Resolver for Resolver<'a> {
         let (ext, res) = self.smart_resolve_macro_path(path, kind, parent_scope, force)?;
 
         let span = invoc.span();
-        invoc.expansion_data.id.set_expn_info(ext.expn_info(span, fast_print_path(path)));
+        invoc.expansion_data.id.set_expn_info(
+            ext.expn_info(parent_scope.expansion, span, fast_print_path(path))
+        );
 
         if let Res::Def(_, def_id) = res {
             if after_derive {

src/libsyntax/ext/base.rs

@@ -640,10 +640,11 @@ impl SyntaxExtension {
         SyntaxExtension::default(SyntaxExtensionKind::NonMacroAttr { mark_used }, edition)
     }
 
-    pub fn expn_info(&self, call_site: Span, descr: Symbol) -> ExpnInfo {
+    pub fn expn_info(&self, parent: ExpnId, call_site: Span, descr: Symbol) -> ExpnInfo {
         ExpnInfo {
-            call_site,
             kind: ExpnKind::Macro(self.macro_kind(), descr),
+            parent,
+            call_site,
             def_site: self.span,
             default_transparency: self.default_transparency,
             allow_internal_unstable: self.allow_internal_unstable.clone(),

src/libsyntax/ext/expand.rs

@@ -353,7 +353,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                 derives.reserve(traits.len());
                 invocations.reserve(traits.len());
                 for path in traits {
-                    let expn_id = ExpnId::fresh(self.cx.current_expansion.id, None);
+                    let expn_id = ExpnId::fresh(None);
                     derives.push(expn_id);
                     invocations.push(Invocation {
                         kind: InvocationKind::Derive { path, item: item.clone() },
@@ -800,13 +800,16 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
         // with exception of the derive container case which is not resolved and can get
         // its expansion info immediately.
         let expn_info = match &kind {
-            InvocationKind::DeriveContainer { item, .. } => Some(ExpnInfo::default(
-                ExpnKind::Macro(MacroKind::Attr, sym::derive),
-                item.span(), self.cx.parse_sess.edition,
-            )),
+            InvocationKind::DeriveContainer { item, .. } => Some(ExpnInfo {
+                parent: self.cx.current_expansion.id,
+                ..ExpnInfo::default(
+                    ExpnKind::Macro(MacroKind::Attr, sym::derive),
+                    item.span(), self.cx.parse_sess.edition,
+                )
+            }),
             _ => None,
         };
-        let expn_id = ExpnId::fresh(self.cx.current_expansion.id, expn_info);
+        let expn_id = ExpnId::fresh(expn_info);
         self.invocations.push(Invocation {
             kind,
             fragment_kind,

src/libsyntax_ext/deriving/clone.rs

@@ -35,7 +35,7 @@ pub fn expand_deriving_clone(cx: &mut ExtCtxt<'_>,
             match annitem.node {
                 ItemKind::Struct(_, Generics { ref params, .. }) |
                 ItemKind::Enum(_, Generics { ref params, .. }) => {
-                    let container_id = cx.current_expansion.id.parent();
+                    let container_id = cx.current_expansion.id.expn_info().parent;
                     if cx.resolver.has_derives(container_id, SpecialDerives::COPY) &&
                         !params.iter().any(|param| match param.kind {
                             ast::GenericParamKind::Type { .. } => true,

src/libsyntax_ext/deriving/cmp/eq.rs

@@ -13,7 +13,7 @@ pub fn expand_deriving_eq(cx: &mut ExtCtxt<'_>,
                           mitem: &MetaItem,
                           item: &Annotatable,
                           push: &mut dyn FnMut(Annotatable)) {
-    cx.resolver.add_derives(cx.current_expansion.id.parent(), SpecialDerives::EQ);
+    cx.resolver.add_derives(cx.current_expansion.id.expn_info().parent, SpecialDerives::EQ);
 
     let inline = cx.meta_word(span, sym::inline);
     let hidden = cx.meta_list_item_word(span, sym::hidden);

src/libsyntax_ext/deriving/cmp/partial_eq.rs

@@ -13,7 +13,7 @@ pub fn expand_deriving_partial_eq(cx: &mut ExtCtxt<'_>,
                                   mitem: &MetaItem,
                                   item: &Annotatable,
                                   push: &mut dyn FnMut(Annotatable)) {
-    cx.resolver.add_derives(cx.current_expansion.id.parent(), SpecialDerives::PARTIAL_EQ);
+    cx.resolver.add_derives(cx.current_expansion.id.expn_info().parent, SpecialDerives::PARTIAL_EQ);
 
     // structures are equal if all fields are equal, and non equal, if
     // any fields are not equal or if the enum variants are different

src/libsyntax_ext/deriving/generic/mod.rs

@@ -425,7 +425,7 @@ impl<'a> TraitDef<'a> {
                         return;
                     }
                 };
-                let container_id = cx.current_expansion.id.parent();
+                let container_id = cx.current_expansion.id.expn_info().parent;
                 let is_always_copy =
                     cx.resolver.has_derives(container_id, SpecialDerives::COPY) &&
                     has_no_type_params;