From: Eli Friedman <eli.friedman@gmail.com>
Date: Wed, 27 May 2009 05:39:06 +0000 (+0000)
Subject: Add IRGen support for local variables of reference type.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4a18784dea763be146df68546e6dbf4233c33077;p=clang

Add IRGen support for local variables of reference type.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72462 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGDecl.cpp b/lib/CodeGen/CGDecl.cpp
index 52bb90e7f8..bcad77be51 100644
--- a/lib/CodeGen/CGDecl.cpp
+++ b/lib/CodeGen/CGDecl.cpp
@@ -332,11 +332,6 @@ void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) {
       DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder);
   }
 
-  if (D.getType()->isReferenceType()) {
-    CGM.ErrorUnsupported(&D, "declaration with reference type");
-    return;
-  }
-  
   // If this local has an initializer, emit it now.
   if (const Expr *Init = D.getInit()) {
     llvm::Value *Loc = DeclPtr;
@@ -344,7 +339,10 @@ void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) {
       bool needsCopyDispose = BlockRequiresCopying(Ty);
       Loc = Builder.CreateStructGEP(DeclPtr, needsCopyDispose*2+4, "x");
     }
-    if (!hasAggregateLLVMType(Init->getType())) {
+    if (Ty->isReferenceType()) {
+      llvm::Value *V = EmitReferenceBindingToExpr(Init, Ty).getScalarVal();
+      EmitStoreOfScalar(V, Loc, false, Ty);
+    } else if (!hasAggregateLLVMType(Init->getType())) {
       llvm::Value *V = EmitScalarExpr(Init);
       EmitStoreOfScalar(V, Loc, D.getType().isVolatileQualified(), 
                         D.getType());
diff --git a/test/CodeGenCXX/references.cpp b/test/CodeGenCXX/references.cpp
index 5c5518b38b..5d4ac06c5b 100644
--- a/test/CodeGenCXX/references.cpp
+++ b/test/CodeGenCXX/references.cpp
@@ -78,3 +78,9 @@ void test_aggregate() {
 int& reference_return() {
   return g;
 }
+
+int reference_decl() {
+  int& a = g;
+  const int& b = 1;
+  return a+b;
+}