From 7d4c083c1909ba1da94754abfab157efcbe7e898 Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Wed, 20 May 2009 00:36:58 +0000
Subject: [PATCH] Bind references to lvalues correctly.

llvm-svn: 72150
---
 clang/lib/CodeGen/CGExpr.cpp         |  6 ++++++
 clang/test/CodeGenCXX/references.cpp | 27 +++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index dc447983f0e4..bb9f20003ac1 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -72,6 +72,12 @@ RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E, llvm::Value *AggLoc,
 
 RValue CodeGenFunction::EmitReferenceBindingToExpr(const Expr* E,
                                                    QualType DestType) {
+  if (E->isLvalue(getContext()) == Expr::LV_Valid) {
+    // Emit the expr as an lvalue.
+    LValue LV = EmitLValue(E);
+    return RValue::get(LV.getAddress());
+  }
+  
   CGM.ErrorUnsupported(E, "reference binding");
   return GetUndefRValue(DestType);
 }
diff --git a/clang/test/CodeGenCXX/references.cpp b/clang/test/CodeGenCXX/references.cpp
index 26d7157e1cb1..2b2b1ff8969e 100644
--- a/clang/test/CodeGenCXX/references.cpp
+++ b/clang/test/CodeGenCXX/references.cpp
@@ -14,3 +14,30 @@ int& gr = g;
 void t3() {
   int b = gr;
 }
+
+// Test reference binding.
+
+struct C {};
+
+void f(const int&);
+void f(const _Complex int&);
+void f(const C&);
+
+void test_scalar() {
+  int a = 10;
+  
+  f(a);
+}
+
+void test_complex() {
+  _Complex int a = 10i;
+  
+  f(a);
+}
+
+void test_aggregate() {
+  C c;
+  
+  f(c);
+}
+