From 7e120030a07ad8c4365526b1c5cd22a641297635 Mon Sep 17 00:00:00 2001
From: Anders Carlsson <andersca@mac.com>
Date: Tue, 24 Nov 2009 05:36:32 +0000
Subject: [PATCH] When mangling a ctor/dtor we need to take into consideration
 whether it's a member template.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89741 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/Mangle.cpp               | 19 +++++++++++++++++--
 test/CodeGenCXX/member-templates.cpp | 11 +++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index 6dacd35d2b..b09b27f489 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -29,6 +29,21 @@
 using namespace clang;
 
 namespace {
+  
+static const CXXMethodDecl *getStructor(const CXXMethodDecl *MD) {
+  assert((isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) &&
+         "Passed in decl is not a ctor or dtor!");
+  
+  if (const TemplateDecl *TD = MD->getPrimaryTemplate()) {
+    MD = cast<CXXMethodDecl>(TD->getTemplatedDecl());
+
+    assert((isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) &&
+           "Templated decl is not a ctor or dtor!");
+  }
+    
+  return MD;
+}
+  
 /// CXXNameMangler - Manage the mangling of a single name.
 class CXXNameMangler {
   MangleContext &Context;
@@ -44,10 +59,10 @@ public:
     : Context(C), Out(Res), Structor(0), StructorType(0) { }
   CXXNameMangler(MangleContext &C, llvm::SmallVectorImpl<char> &Res,
                  const CXXConstructorDecl *D, CXXCtorType Type)
-    : Context(C), Out(Res), Structor(D), StructorType(Type) { }
+    : Context(C), Out(Res), Structor(getStructor(D)), StructorType(Type) { }
   CXXNameMangler(MangleContext &C, llvm::SmallVectorImpl<char> &Res,
                  const CXXDestructorDecl *D, CXXDtorType Type)
-    : Context(C), Out(Res), Structor(D), StructorType(Type) { }
+    : Context(C), Out(Res), Structor(getStructor(D)), StructorType(Type) { }
 
   llvm::raw_svector_ostream &getStream() { return Out; }
 
diff --git a/test/CodeGenCXX/member-templates.cpp b/test/CodeGenCXX/member-templates.cpp
index c2df012053..d85d6394f0 100644
--- a/test/CodeGenCXX/member-templates.cpp
+++ b/test/CodeGenCXX/member-templates.cpp
@@ -7,3 +7,14 @@ struct A {
 };
 
 template<typename T> A::A(T) {}
+
+struct B {
+  template<typename T>
+  B(T);
+};
+
+template<typename T> B::B(T) {}
+
+// CHECK: define void @_ZN1BC1IiEET_(%struct.B* %this, i32)
+// CHECK: define void @_ZN1BC2IiEET_(%struct.B* %this, i32)
+template B::B(int);
-- 
2.40.0