From: Anders Carlsson <andersca@mac.com>
Date: Thu, 4 Nov 2010 04:31:32 +0000 (+0000)
Subject: Mangle std::nullptr_t as specified by the Itanium C++ ABI.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e292368afa63337f5ff64c967857a898d6f868da;p=clang

Mangle std::nullptr_t as specified by the Itanium C++ ABI.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118236 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index 37ecf28598..d1e3a98789 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -1219,9 +1219,8 @@ void CXXNameMangler::mangleType(const BuiltinType *T) {
   // UNSUPPORTED:    ::= Dh # IEEE 754r half-precision floating point (16 bits)
   //                 ::= Di # char32_t
   //                 ::= Ds # char16_t
+  //                 ::= Dn # std::nullptr_t (i.e., decltype(nullptr))
   //                 ::= u <source-name>    # vendor extended type
-  // From our point of view, std::nullptr_t is a builtin, but as far as mangling
-  // is concerned, it's a type called std::nullptr_t.
   switch (T->getKind()) {
   case BuiltinType::Void: Out << 'v'; break;
   case BuiltinType::Bool: Out << 'b'; break;
@@ -1244,7 +1243,7 @@ void CXXNameMangler::mangleType(const BuiltinType *T) {
   case BuiltinType::Float: Out << 'f'; break;
   case BuiltinType::Double: Out << 'd'; break;
   case BuiltinType::LongDouble: Out << 'e'; break;
-  case BuiltinType::NullPtr: Out << "St9nullptr_t"; break;
+  case BuiltinType::NullPtr: Out << "Dn"; break;
 
   case BuiltinType::Overload:
   case BuiltinType::Dependent:
diff --git a/test/CodeGenCXX/mangle.cpp b/test/CodeGenCXX/mangle.cpp
index e78ad3996e..b5207a1712 100644
--- a/test/CodeGenCXX/mangle.cpp
+++ b/test/CodeGenCXX/mangle.cpp
@@ -630,3 +630,8 @@ namespace test21 {
   // CHECK: define void @_ZN6test2112vla_arg_funcEiPA_i(
   void vla_arg_func(int X, int a[X][X]) {}
 }
+
+namespace test22 {
+  // CHECK: define void @_ZN6test221fEDn(
+  void f(decltype(nullptr)) { }
+}