constexpr: support for evaluation and codegen of typeid constants.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147290 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index 4fc75a613e..46580697de 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -697,6 +697,7 @@ static bool IsGlobalLValue(APValue::LValueBase B) {
   case Expr::PredefinedExprClass:
   case Expr::ObjCStringLiteralClass:
   case Expr::ObjCEncodeExprClass:
+  case Expr::CXXTypeidExprClass:
     return true;
   case Expr::CallExprClass:
     return IsStringLiteralCall(cast<CallExpr>(E));
@@ -2329,6 +2330,7 @@ public:
 // - Literals
 //  * CompoundLiteralExpr in C
 //  * StringLiteral
+//  * CXXTypeidExpr
 //  * PredefinedExpr
 //  * ObjCStringLiteralExpr
 //  * ObjCEncodeExpr
@@ -2356,6 +2358,7 @@ public:
   bool VisitMemberExpr(const MemberExpr *E);
   bool VisitStringLiteral(const StringLiteral *E) { return Success(E); }
   bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); }
+  bool VisitCXXTypeidExpr(const CXXTypeidExpr *E);
   bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E);
   bool VisitUnaryDeref(const UnaryOperator *E);
 
@@ -2451,6 +2454,19 @@ LValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) {
   return Success(E);
 }
 
+bool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) {
+  if (E->isTypeOperand())
+    return Success(E);
+  CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl();
+  if (RD && RD->isPolymorphic()) {
+    Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic)
+      << E->getExprOperand()->getType()
+      << E->getExprOperand()->getSourceRange();
+    return false;
+  }
+  return Success(E);
+}
+
 bool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) {
   // Handle static data members.
   if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) {