Add CodeGen support for CXXZeroInitValueExpr.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55249 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 26 insertions, 0 deletions

diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index a01832f2ee..b004bde7bd 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -720,6 +720,9 @@ bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx,
     Result.setIsUnsigned(!getType()->isSignedIntegerType());
     break;
   }
+  case CXXZeroInitValueExprClass:
+    Result.clear();
+    break;
   case TypesCompatibleExprClass: {
     const TypesCompatibleExpr *TCE = cast<TypesCompatibleExpr>(this);
     Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType())));
diff --git a/lib/CodeGen/CGExprComplex.cpp b/lib/CodeGen/CGExprComplex.cpp
index ba384e7f4f..3e1f695c79 100644
--- a/lib/CodeGen/CGExprComplex.cpp
+++ b/lib/CodeGen/CGExprComplex.cpp
@@ -124,6 +124,12 @@ public:
   ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
     return Visit(DAE->getExpr());
   }
+  ComplexPairTy VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) {
+    assert(E->getType()->isAnyComplexType() && "Expected complex type!");
+    QualType Elem = E->getType()->getAsComplexType()->getElementType();
+    llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
+    return ComplexPairTy(Null, Null);
+  }
   
   struct BinOpInfo {
     ComplexPairTy LHS;
diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
index fe9b5c9513..9f94d4244f 100644
--- a/lib/CodeGen/CGExprConstant.cpp
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -61,6 +61,9 @@ public:
   llvm::Constant *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
     return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
   }
+  llvm::Constant *VisitCXXZeroInitValueExpr(const CXXZeroInitValueExpr *E) {
+    return llvm::Constant::getNullValue(ConvertType(E->getType()));
+  }
   llvm::Constant *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
     std::string S(E->getString()->getStrData(), 
                   E->getString()->getByteLength());
diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp
index 3f7b737752..af8fe2779b 100644
--- a/lib/CodeGen/CGExprScalar.cpp
+++ b/lib/CodeGen/CGExprScalar.cpp
@@ -109,6 +109,9 @@ public:
   Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
     return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
   }
+  Value *VisitCXXZeroInitValueExpr(const CXXZeroInitValueExpr *E) {
+    return llvm::Constant::getNullValue(ConvertType(E->getType()));
+  }
   Value *VisitTypesCompatibleExpr(const TypesCompatibleExpr *E) {
     return llvm::ConstantInt::get(ConvertType(E->getType()),
                                   CGF.getContext().typesAreCompatible(
diff --git a/test/CodeGen/cxx-value-init.cpp b/test/CodeGen/cxx-value-init.cpp
new file mode 100644
index 0000000000..b1cddd913f
--- /dev/null
+++ b/test/CodeGen/cxx-value-init.cpp
@@ -0,0 +1,11 @@
+// RUN: clang -emit-llvm %s -o %t
+
+enum E {};

+int v1 = E();

+float v2 = float();

+

+void f() {

+  int v3 = int();

+  _Complex int v4 = typeof(_Complex int)();
+  _Complex float v5 = typeof(_Complex float)();
+}