[PATCH] AST: Mangle nullptr properly in template args for the Itanium ABI

[David Majnemer]

Hi rsmith, rjmccall, eli.friedman, doug.gregor,

We would previously treat nullptr literals as we were mangling the for
the null pointer value of the template parameter's type instead.

This fixes PR17141.

http://llvm-reviews.chandlerc.com/D1625

Files:
  lib/AST/ItaniumMangle.cpp
  test/CodeGenCXX/mangle-nullptr-arg.cpp
  test/CodeGenCXX/visibility.cpp

Index: lib/AST/ItaniumMangle.cpp
===================================================================
--- lib/AST/ItaniumMangle.cpp
+++ lib/AST/ItaniumMangle.cpp
@@ -3337,10 +3337,8 @@
     break;
   }
   case TemplateArgument::NullPtr: {
-    //  <expr-primary> ::= L <type> 0 E
-    Out << 'L';
-    mangleType(A.getNullPtrType());
-    Out << "0E";
+    //  <expr-primary> ::= L <nullptr type> E
+    Out << "LDnE";
     break;
   }
   case TemplateArgument::Pack: {
Index: test/CodeGenCXX/mangle-nullptr-arg.cpp
===================================================================
--- test/CodeGenCXX/mangle-nullptr-arg.cpp
+++ test/CodeGenCXX/mangle-nullptr-arg.cpp
@@ -2,15 +2,15 @@
 
 template<int *ip> struct IP {};
 
-// CHECK-LABEL: define void @_Z5test12IPILPi0EE
+// CHECK-LABEL: define void @_Z5test12IPILDnEE
 void test1(IP<nullptr>) {}
 
 struct X{ };
 template<int X::*pm> struct PM {};
 
-// CHECK-LABEL: define void @_Z5test22PMILM1Xi0EE
+// CHECK-LABEL: define void @_Z5test22PMILDnEE
 void test2(PM<nullptr>) { }
 
-// CHECK-LABEL: define void @_Z5test316DependentTypePtrIPiLS0_0EE
+// CHECK-LABEL: define void @_Z5test316DependentTypePtrIPiLDnEE
 template<typename T, T x> struct DependentTypePtr {};
 void test3(DependentTypePtr<int*,nullptr>) { }
Index: test/CodeGenCXX/visibility.cpp
===================================================================
--- test/CodeGenCXX/visibility.cpp
+++ test/CodeGenCXX/visibility.cpp
@@ -971,8 +971,8 @@
   void f() {
     zed<nullptr>();
   }
-  // CHECK-LABEL: define internal void @_ZN6test523zedILPNS_12_GLOBAL__N_13fooE0EEEvv
-  // CHECK-HIDDEN-LABEL: define internal void @_ZN6test523zedILPNS_12_GLOBAL__N_13fooE0EEEvv
+  // CHECK-LABEL: define internal void @_ZN6test523zedILDnEEEvv
+  // CHECK-HIDDEN-LABEL: define internal void @_ZN6test523zedILDnEEEvv
 }
 
 namespace test53 {
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