Sema: Allow IndirectFieldDecl to appear in a non-type template argument

We would not identify pointer-to-member construction in a non-type
template argument if it was either a FieldDecl or a CXXMethodDecl.
However, this would incorrectly reject declarations that were injected
via an IndirectFieldDecl (e.g. a field inside of an anonymous union).

This fixes PR17657.

llvm-svn: 193203

diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index c49756d..c8e2b0d 100644 (file)
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -4609,8 +4609,11 @@ static bool CheckTemplateArgumentPointerToMember(Sema &S,
                   diag::err_template_arg_not_pointer_to_member_form)
       << Arg->getSourceRange();
 
-  if (isa<FieldDecl>(DRE->getDecl()) || isa<CXXMethodDecl>(DRE->getDecl())) {
+  if (isa<FieldDecl>(DRE->getDecl()) ||
+      isa<IndirectFieldDecl>(DRE->getDecl()) ||
+      isa<CXXMethodDecl>(DRE->getDecl())) {
     assert((isa<FieldDecl>(DRE->getDecl()) ||
+            isa<IndirectFieldDecl>(DRE->getDecl()) ||
             !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&
            "Only non-static member pointers can make it here");
 

diff --git a/clang/test/SemaTemplate/temp_arg_nontype.cpp b/clang/test/SemaTemplate/temp_arg_nontype.cpp
index 4a75b11..fcdfd45 100644 (file)
--- a/clang/test/SemaTemplate/temp_arg_nontype.cpp
+++ b/clang/test/SemaTemplate/temp_arg_nontype.cpp
@@ -75,6 +75,9 @@ struct Z {
 
   int int_member;
   float float_member;
+  union {
+    int union_member;
+  };
 };
 template<int (Z::*pmf)(int)> struct A6; // expected-note{{template parameter is declared here}}
 A6<&Z::foo> *a17_1;
@@ -88,6 +91,7 @@ A7<&Z::int_member> *a18_1;
 A7c<&Z::int_member> *a18_2;
 A7<&Z::float_member> *a18_3; // expected-error{{non-type template argument of type 'float Z::*' cannot be converted to a value of type 'int Z::*'}}
 A7c<(&Z::int_member)> *a18_4; // expected-warning{{address non-type template argument cannot be surrounded by parentheses}}
+A7c<&Z::union_member> *a18_5;
 
 template<unsigned char C> struct Overflow; // expected-note{{template parameter is declared here}}