Support va_arg on _Complex.

gcc compat test suite results (Darwin x86-32 & -64):
--
# of expected passes		1110
# of unexpected failures	74
# of unresolved testcases	168
# of unsupported tests		2

llvm-svn: 64197

1 files changed, 18 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index 387635c..89a206d 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -192,6 +192,8 @@ public:
   ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
 
   ComplexPairTy VisitInitListExpr(InitListExpr *E);
+
+  ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
 };
 }  // end anonymous namespace.
 
@@ -528,6 +530,22 @@ ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
   return ComplexPairTy(zeroConstant, zeroConstant);
 }
 
+ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
+  llvm::Value *ArgValue = CGF.EmitLValue(E->getSubExpr()).getAddress();
+  llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
+
+  if (!ArgPtr) {
+    CGF.ErrorUnsupported(E, "complex va_arg expression");
+    const llvm::Type *EltTy = 
+      CGF.ConvertType(E->getType()->getAsComplexType()->getElementType());
+    llvm::Value *U = llvm::UndefValue::get(EltTy);
+    return ComplexPairTy(U, U);
+  }
+
+  // FIXME Volatility.
+  return EmitLoadOfComplex(ArgPtr, false);
+}
+
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