WIP for #252

Removed TyTy::UnitType and TyTy::TypeKind::UNIT.
Replaced by TyTy::TupleType with an empty list of fields.

Added default empty vector for fields in ctor for TyTy::TypeType.

4 files changed, 18 insertions, 13 deletions

diff --git a/gcc/rust/backend/rust-compile-context.h b/gcc/rust/backend/rust-compile-context.h
index 6f45e57..6347464 100644
--- a/gcc/rust/backend/rust-compile-context.h
+++ b/gcc/rust/backend/rust-compile-context.h
@@ -351,11 +351,6 @@ public:
       ctx->get_mappings ()->lookup_location (type.get_ref ()));
   }
 
-  void visit (TyTy::UnitType &) override
-  {
-    translated = ctx->get_backend ()->void_type ();
-  }
-
   void visit (TyTy::ADTType &type) override
   {
     if (ctx->lookup_compiled_types (type.get_ty_ref (), &translated, &type))
@@ -389,6 +384,12 @@ public:
 
   void visit (TyTy::TupleType &type) override
   {
+    if (type.num_fields () == 0)
+      {
+	translated = ctx->get_backend ()->void_type ();
+	return;
+      }
+
     bool ok = ctx->lookup_compiled_types (type.get_ty_ref (), &translated);
     if (ok)
       return;
diff --git a/gcc/rust/backend/rust-compile-expr.h b/gcc/rust/backend/rust-compile-expr.h
index f4353cd..d0c752c 100644
--- a/gcc/rust/backend/rust-compile-expr.h
+++ b/gcc/rust/backend/rust-compile-expr.h
@@ -368,7 +368,7 @@ public:
       }
 
     Bvariable *tmp = NULL;
-    bool needs_temp = if_type->get_kind () != TyTy::TypeKind::UNIT;
+    bool needs_temp = !if_type->is_unit ();
     if (needs_temp)
       {
 	fncontext fnctx = ctx->peek_fn ();
@@ -405,7 +405,7 @@ public:
       }
 
     Bvariable *tmp = NULL;
-    bool needs_temp = if_type->get_kind () != TyTy::TypeKind::UNIT;
+    bool needs_temp = !if_type->is_unit ();
     if (needs_temp)
       {
 	fncontext fnctx = ctx->peek_fn ();
@@ -441,7 +441,7 @@ public:
       }
 
     Bvariable *tmp = NULL;
-    bool needs_temp = block_tyty->get_kind () != TyTy::TypeKind::UNIT;
+    bool needs_temp = !block_tyty->is_unit ();
     if (needs_temp)
       {
 	fncontext fnctx = ctx->peek_fn ();
@@ -541,7 +541,7 @@ public:
 
     fncontext fnctx = ctx->peek_fn ();
     Bvariable *tmp = NULL;
-    bool needs_temp = block_tyty->get_kind () != TyTy::TypeKind::UNIT;
+    bool needs_temp = !block_tyty->is_unit ();
     if (needs_temp)
       {
 	Bblock *enclosing_scope = ctx->peek_enclosing_scope ();
diff --git a/gcc/rust/backend/rust-compile-stmt.h b/gcc/rust/backend/rust-compile-stmt.h
index 3c2916d..a777df6 100644
--- a/gcc/rust/backend/rust-compile-stmt.h
+++ b/gcc/rust/backend/rust-compile-stmt.h
@@ -81,7 +81,7 @@ public:
       return;
 
     auto fnctx = ctx->peek_fn ();
-    if (ty->get_kind () == TyTy::TypeKind::UNIT)
+    if (ty->is_unit ())
       {
 	Bstatement *expr_stmt
 	  = ctx->get_backend ()->expression_statement (fnctx.fndecl, init);
diff --git a/gcc/rust/backend/rust-compile-tyty.h b/gcc/rust/backend/rust-compile-tyty.h
index 774fd2e..44d9416 100644
--- a/gcc/rust/backend/rust-compile-tyty.h
+++ b/gcc/rust/backend/rust-compile-tyty.h
@@ -50,7 +50,13 @@ public:
 
   void visit (TyTy::ADTType &) override { gcc_unreachable (); }
 
-  void visit (TyTy::TupleType &) override { gcc_unreachable (); }
+  void visit (TyTy::TupleType &type) override
+  {
+    if (type.num_fields () == 0)
+      translated = backend->void_type ();
+    else
+      gcc_unreachable ();
+  }
 
   void visit (TyTy::ArrayType &) override { gcc_unreachable (); }
 
@@ -60,8 +66,6 @@ public:
 
   void visit (TyTy::FnPtr &type) override { gcc_unreachable (); }
 
-  void visit (TyTy::UnitType &) override { translated = backend->void_type (); }
-
   void visit (TyTy::FnType &type) override
   {
     Backend::Btyped_identifier receiver;