hir: Add EnumItemKind enum for EnumItem classes

Author: CohenArthur

gcc/rust/hir/tree/rust-hir-full-test.cc

@@ -3108,6 +3108,22 @@ EnumItem::as_string () const
 {
   std::string str = Item::as_string ();
   str += variant_name;
+  str += " ";
+  switch (get_enum_item_kind ())
+    {
+    case Named:
+      str += "[Named variant]";
+      break;
+    case Tuple:
+      str += "[Tuple variant]";
+      break;
+    case Struct:
+      str += "[Struct variant]";
+      break;
+    case Discriminant:
+      str += "[Discriminant variant]";
+      break;
+    }
 
   return str;
 }

gcc/rust/hir/tree/rust-hir-item.h

@@ -1588,7 +1588,7 @@ struct TupleField
 
   std::string as_string () const;
 
-  Analysis::NodeMapping get_mappings () { return mappings; }
+  Analysis::NodeMapping get_mappings () const { return mappings; }
 
   Location get_locus () const { return locus; }
 
@@ -1644,12 +1644,19 @@ class TupleStruct : public Struct
 class EnumItem : public Item
 {
   Identifier variant_name;
-
   Location locus;
 
 public:
   virtual ~EnumItem () {}
 
+  enum EnumItemKind
+  {
+    Named,
+    Tuple,
+    Struct,
+    Discriminant,
+  };
+
   EnumItem (Analysis::NodeMapping mappings, Identifier variant_name,
 	    AST::AttrVec outer_attrs, Location locus)
     : Item (std::move (mappings), std::move (outer_attrs)),
@@ -1663,6 +1670,7 @@ class EnumItem : public Item
   }
 
   virtual std::string as_string () const override;
+  virtual EnumItemKind get_enum_item_kind () const { return Named; };
 
   // not pure virtual as not abstract
   void accept_vis (HIRFullVisitor &vis) override;
@@ -1687,6 +1695,11 @@ class EnumItemTuple : public EnumItem
   // Returns whether tuple enum item has tuple fields.
   bool has_tuple_fields () const { return !tuple_fields.empty (); }
 
+  EnumItemKind get_enum_item_kind () const override
+  {
+    return EnumItemKind::Tuple;
+  }
+
   EnumItemTuple (Analysis::NodeMapping mappings, Identifier variant_name,
 		 std::vector<TupleField> tuple_fields, AST::AttrVec outer_attrs,
 		 Location locus)
@@ -1720,6 +1733,11 @@ class EnumItemStruct : public EnumItem
   // Returns whether struct enum item has struct fields.
   bool has_struct_fields () const { return !struct_fields.empty (); }
 
+  EnumItemKind get_enum_item_kind () const override
+  {
+    return EnumItemKind::Struct;
+  }
+
   EnumItemStruct (Analysis::NodeMapping mappings, Identifier variant_name,
 		  std::vector<StructField> struct_fields,
 		  AST::AttrVec outer_attrs, Location locus)
@@ -1777,6 +1795,11 @@ class EnumItemDiscriminant : public EnumItem
   EnumItemDiscriminant (EnumItemDiscriminant &&other) = default;
   EnumItemDiscriminant &operator= (EnumItemDiscriminant &&other) = default;
 
+  EnumItemKind get_enum_item_kind () const override
+  {
+    return EnumItemKind::Discriminant;
+  }
+
   std::string as_string () const override;
 
   void accept_vis (HIRFullVisitor &vis) override;