ir-gen for generation of trvial copy constructor

call.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@79034 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 27 insertions, 1 deletions

diff --git a/lib/CodeGen/CGCXX.cpp b/lib/CodeGen/CGCXX.cpp
index 04da0ee175..a36c887eaa 100644
--- a/lib/CodeGen/CGCXX.cpp
+++ b/lib/CodeGen/CGCXX.cpp
@@ -338,6 +338,19 @@ CodeGenFunction::EmitCXXConstructorCall(const CXXConstructorDecl *D,
                                         llvm::Value *This,
                                         CallExpr::const_arg_iterator ArgBeg,
                                         CallExpr::const_arg_iterator ArgEnd) {
+  if (D->isCopyConstructor(getContext())) {
+    const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D->getDeclContext());
+    if (ClassDecl->hasTrivialCopyConstructor()) {
+      assert(!ClassDecl->hasUserDeclaredCopyConstructor() &&
+             "EmitCXXConstructorCall - user declared copy constructor");
+      const Expr *E = (*ArgBeg);
+      QualType Ty = E->getType();
+      llvm::Value *Src = EmitLValue(E).getAddress();
+      EmitAggregateCopy(This, Src, Ty);
+      return;
+    }
+  }
+  
   llvm::Value *Callee = CGM.GetAddrOfCXXConstructor(D, Type);
 
   EmitCXXMemberCall(D, Callee, This, ArgBeg, ArgEnd);
diff --git a/test/CodeGenCXX/copy-constructor-elim.cpp b/test/CodeGenCXX/copy-constructor-elim.cpp
index 5a1109d7f7..2a6be90bc6 100644
--- a/test/CodeGenCXX/copy-constructor-elim.cpp
+++ b/test/CodeGenCXX/copy-constructor-elim.cpp
@@ -1,5 +1,7 @@
 // RUN: clang-cc -emit-llvm -o %t %s &&
-// RUN: grep "_ZN1CC1ERK1C" %t | count 0
+// RUN: grep "_ZN1CC1ERK1C" %t | count 0 &&
+// RUN: grep "_ZN1SC1ERK1S" %t | count 0 &&
+// RUN: true
 
 extern "C" int printf(...);
 
@@ -22,10 +24,21 @@ public:
 	}
 };
 
+
+struct S {
+  S();
+};
+
+S::S() { printf("S()\n"); }
+
+void Call(S) {};
+
 int main()
 {
 	X a(1);
 	X b(a, 2);
 	X c = b;
 	X d(a, 5, 6);
+        S s;
+        Call(s);
 }