[gcc/devel/rust/master] hir: Add `EnumItemKind` enum for EnumItem classes

[gcc/devel/rust/master] hir: Add `EnumItemKind` enum for EnumItem classes

[Thomas Schwinge]

https://gcc.gnu.org/g:126f7aecdcdf1bf3044e0a0165324ed3ce258a78

commit 126f7aecdcdf1bf3044e0a0165324ed3ce258a78
Author: Arthur Cohen <arthur.cohen@embecosm.com>
Date:   Thu Apr 14 10:49:19 2022 +0200

    hir: Add `EnumItemKind` enum for EnumItem classes

Diff:
---
 gcc/rust/hir/tree/rust-hir-full-test.cc | 16 ++++++++++++++++
 gcc/rust/hir/tree/rust-hir-item.h       | 27 +++++++++++++++++++++++++--
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/gcc/rust/hir/tree/rust-hir-full-test.cc b/gcc/rust/hir/tree/rust-hir-full-test.cc
index 9b56086ea55..a996228ce31 100644
--- a/gcc/rust/hir/tree/rust-hir-full-test.cc
+++ b/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;
 }
diff --git a/gcc/rust/hir/tree/rust-hir-item.h b/gcc/rust/hir/tree/rust-hir-item.h
index bc26725ff0b..2f696307cfe 100644
--- a/gcc/rust/hir/tree/rust-hir-item.h
+++ b/gcc/rust/hir/tree/rust-hir-item.h
@@ -1588,7 +1588,7 @@ public:
 
   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 @@ protected:
 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 @@ public:
   }
 
   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 @@ public:
   // 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 @@ public:
   // 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 @@ public:
   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;