From 88599176d106453935a8fa984f690362cc48b470 Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Sun, 27 Sep 2009 01:06:07 +0000
Subject: [PATCH] Look for substitutions when mangling TypenameTypes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82885 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/Mangle.cpp           |  9 ++++++---
 test/CodeGenCXX/mangle-subst.cpp | 15 +++++++++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index 447255c668..660a36bce0 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -920,10 +920,13 @@ void CXXNameMangler::mangleType(const TypenameType *T) {
   const Type *QTy = T->getQualifier()->getAsType();
   if (const TemplateSpecializationType *TST = 
         dyn_cast<TemplateSpecializationType>(QTy)) {
-    TemplateDecl *TD = TST->getTemplateName().getAsTemplateDecl();
+    if (!mangleSubstitution(QualType(TST, 0))) {
+      TemplateDecl *TD = TST->getTemplateName().getAsTemplateDecl();
 
-    mangleTemplatePrefix(TD);
-    mangleTemplateArgs(TST->getArgs(), TST->getNumArgs());
+      mangleTemplatePrefix(TD);
+      mangleTemplateArgs(TST->getArgs(), TST->getNumArgs());
+      addSubstitution(QualType(TST, 0));
+    }
   } else if (const TemplateTypeParmType *TTPT = 
               dyn_cast<TemplateTypeParmType>(QTy)) {
     // We use the QualType mangle type variant here because it handles
diff --git a/test/CodeGenCXX/mangle-subst.cpp b/test/CodeGenCXX/mangle-subst.cpp
index 2ff375e711..cda6df58ea 100644
--- a/test/CodeGenCXX/mangle-subst.cpp
+++ b/test/CodeGenCXX/mangle-subst.cpp
@@ -31,3 +31,18 @@ struct C {
 
 // CHECK: define void @_Z1fN1C1DERS_PS_S1_(
 void f(C::D, C&, C*, C&) { }
+
+template<typename T>
+struct V {
+  typedef int U;
+};
+
+template <typename T> void f1(typename V<T>::U, V<T>) { }
+
+// CHECK: @_Z2f1IiEvN1VIT_E1UES2_
+template void f1<int>(int, V<int>);
+
+template <typename T> void f2(V<T>, typename V<T>::U) { }
+
+// CHECK: @_Z2f2IiEv1VIT_ENS2_1UE
+template void f2<int>(V<int>, int);
-- 
2.40.0