Compute types of c++ cast expressions

Signed-off-by: Roberto Raggi <[email protected]>

Author: robertoraggi

src/parser/cxx/parser.cc

@@ -2601,6 +2601,32 @@ auto Parser::parse_cpp_cast_expression(ExpressionAST*& yyast,
 
   expect(TokenKind::T_RPAREN, ast->rparenLoc);
 
+  auto check_cpp_cast = [&] -> void {
+    if (!ast->typeId) {
+      return;
+    }
+
+    ast->type = ast->typeId->type;
+
+    if (auto refType = type_cast<LvalueReferenceType>(ast->type)) {
+      ast->type = refType->elementType();
+      ast->valueCategory = ValueCategory::kLValue;
+      return;
+    }
+
+    if (auto rvalueRefType = type_cast<RvalueReferenceType>(ast->type)) {
+      ast->type = rvalueRefType->elementType();
+
+      if (type_cast<FunctionType>(ast->type)) {
+        ast->valueCategory = ValueCategory::kLValue;
+      } else {
+        ast->valueCategory = ValueCategory::kXValue;
+      }
+    }
+  };
+
+  check_cpp_cast();
+
   return true;
 }
 

tests/unit_tests/sema/static_cast_01.cc

@@ -0,0 +1,31 @@
+// RUN: %cxx -verify -fcheck %s
+
+struct X {};
+
+using F = int();
+
+int f() { return 0; }
+
+auto main() -> int {
+  X x;
+
+  F&& rf = f;
+
+  // prvalue
+  static_assert(__is_reference(decltype(static_cast<X>(x))) == false);
+
+  // lvalue if lvalue reference to object type
+  static_assert(__is_lvalue_reference(decltype(static_cast<X&>(x))));
+
+  // rvalue if rvalue reference to object type
+  static_assert(__is_rvalue_reference(decltype(static_cast<X&&>(x))));
+
+  // prvalue
+  static_assert(__is_reference(decltype(static_cast<F*>(f))) == false);
+
+  // lvalue if lvalue reference to function type
+  static_assert(__is_lvalue_reference(decltype(static_cast<F&>(f))));
+
+  // lvalue if rvalue reference to function type
+  static_assert(__is_lvalue_reference(decltype(static_cast<F&&>(f))));
+}