Implement support for null non-type template arguments for non-type

template parameters of pointer, pointer-to-member, or nullptr_t
type in C++11. Fixes PR9700 / <rdar://problem/11193097>.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154219 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 2 deletions

diff --git a/lib/AST/ItaniumMangle.cpp b/lib/AST/ItaniumMangle.cpp
index 5457036920..d7b6354540 100644
--- a/lib/AST/ItaniumMangle.cpp
+++ b/lib/AST/ItaniumMangle.cpp
@@ -3118,12 +3118,22 @@ void CXXNameMangler::mangleTemplateArg(const NamedDecl *P,
   case TemplateArgument::Declaration: {
     assert(P && "Missing template parameter for declaration argument");
     //  <expr-primary> ::= L <mangled-name> E # external name
-
+    //  <expr-primary> ::= L <type> 0 E
     // Clang produces AST's where pointer-to-member-function expressions
     // and pointer-to-function expressions are represented as a declaration not
     // an expression. We compensate for it here to produce the correct mangling.
-    NamedDecl *D = cast<NamedDecl>(A.getAsDecl());
     const NonTypeTemplateParmDecl *Parameter = cast<NonTypeTemplateParmDecl>(P);
+
+    // Handle NULL pointer arguments.
+    if (!A.getAsDecl()) {
+      Out << "L";
+      mangleType(Parameter->getType());
+      Out << "0E";
+      break;
+    }
+    
+
+    NamedDecl *D = cast<NamedDecl>(A.getAsDecl());
     bool compensateMangling = !Parameter->getType()->isReferenceType();
     if (compensateMangling) {
       Out << 'X';