[c++1z] N4295: fold-expressions.

This is a new form of expression of the form:

  (expr op ... op expr)

where one of the exprs is a parameter pack. It expands into

  (expr1 op (expr2onwards op ... op expr))

(and likewise if the pack is on the right). The non-pack operand can be
omitted; in that case, an empty pack gives a fallback value or an error,
depending on the operator.

llvm-svn: 221573

1 files changed, 25 insertions, 2 deletions

diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index e41c664c8f2..d7b82eb56a7 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -3209,12 +3209,35 @@ recurse:
       mangleFunctionParam(cast<ParmVarDecl>(Pack));
     break;
   }
-      
+
   case Expr::MaterializeTemporaryExprClass: {
     mangleExpression(cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr());
     break;
   }
-      
+
+  case Expr::CXXFoldExprClass: {
+    auto *FE = cast<CXXFoldExpr>(E);
+    if (!FE->getLHS())
+      Out << "fl";
+    else if (!FE->getRHS())
+      Out << "fr";
+    else
+      Out << "fx";
+
+    if (FE->getOperator() == BO_PtrMemD)
+      Out << "ds";
+    else
+      mangleOperatorName(
+          BinaryOperator::getOverloadedOperator(FE->getOperator()),
+          /*Arity=*/2);
+
+    if (FE->getLHS())
+      mangleExpression(FE->getLHS());
+    if (FE->getRHS())
+      mangleExpression(FE->getRHS());
+    break;
+  }
+
   case Expr::CXXThisExprClass:
     Out << "fpT";
     break;