From 0370eb20342a1b4118ca66366f25de8dc1c929bd Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Wed, 31 Oct 2007 22:04:46 +0000
Subject: Handle function calls that return aggregate expressions.

llvm-svn: 43581
---
 clang/CodeGen/CGExprAgg.cpp | 15 ++++++++++++++-
 clang/test/CodeGen/struct.c | 14 ++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

(limited to 'clang')

diff --git a/clang/CodeGen/CGExprAgg.cpp b/clang/CodeGen/CGExprAgg.cpp
index 160f491c5e8..ea36225ba58 100644
--- a/clang/CodeGen/CGExprAgg.cpp
+++ b/clang/CodeGen/CGExprAgg.cpp
@@ -67,7 +67,7 @@ public:
   //  case Expr::UnaryOperatorClass:
   //  case Expr::ImplicitCastExprClass:
   //  case Expr::CastExprClass: 
-  //  case Expr::CallExprClass:
+  void VisitCallExpr(const CallExpr *E);
   void VisitStmtExpr(const StmtExpr *E);
   void VisitBinaryOperator(const BinaryOperator *BO);
   void VisitBinAssign(const BinaryOperator *E);
@@ -132,6 +132,19 @@ void AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) {
 //                            Visitor Methods
 //===----------------------------------------------------------------------===//
 
+void AggExprEmitter::VisitCallExpr(const CallExpr *E)
+{
+  RValue RV = CGF.EmitCallExpr(E);
+  assert(RV.isAggregate() && "Return value must be aggregate value!");
+  
+  // If the result is ignored, don't copy from the value.
+  if (DestPtr == 0)
+    // FIXME: If the source is volatile, we must read from it.
+    return;
+  
+  EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType());
+}
+
 void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) {
   CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest);
 }
diff --git a/clang/test/CodeGen/struct.c b/clang/test/CodeGen/struct.c
index 443fc33ccb3..83ac4d21951 100644
--- a/clang/test/CodeGen/struct.c
+++ b/clang/test/CodeGen/struct.c
@@ -63,3 +63,17 @@ void f4() {
 void f5() {
   (f3())->d1 = 42;
 }
+
+/* Function calls */
+typedef struct {
+  int location;
+  int length;
+} range;
+
+extern range f6();
+void f7()
+{
+	range r = f6();
+}
+
+
-- 
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