[modules] Don't allow use of non-visible (inherited) default template arguments.

llvm-svn: 239487

3 files changed, 12 insertions, 8 deletions

diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 6bb4be1d18b..9a154111226 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -3299,7 +3299,7 @@ Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
   HasDefaultArg = false;
 
   if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) {
-    if (!TypeParm->hasDefaultArgument())
+    if (!hasVisibleDefaultArgument(TypeParm))
       return TemplateArgumentLoc();
 
     HasDefaultArg = true;
@@ -3316,7 +3316,7 @@ Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
 
   if (NonTypeTemplateParmDecl *NonTypeParm
         = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
-    if (!NonTypeParm->hasDefaultArgument())
+    if (!hasVisibleDefaultArgument(NonTypeParm))
       return TemplateArgumentLoc();
 
     HasDefaultArg = true;
@@ -3334,7 +3334,7 @@ Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template,
 
   TemplateTemplateParmDecl *TempTempParm
     = cast<TemplateTemplateParmDecl>(Param);
-  if (!TempTempParm->hasDefaultArgument())
+  if (!hasVisibleDefaultArgument(TempTempParm))
     return TemplateArgumentLoc();
 
   HasDefaultArg = true;
@@ -3799,7 +3799,7 @@ bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
     // (when the template parameter was part of a nested template) into
     // the default argument.
     if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) {
-      if (!TTP->hasDefaultArgument())
+      if (!hasVisibleDefaultArgument(TTP))
         return diagnoseArityMismatch(*this, Template, TemplateLoc, NewArgs);
 
       TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this,
@@ -3815,7 +3815,7 @@ bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
                                 ArgType);
     } else if (NonTypeTemplateParmDecl *NTTP
                  = dyn_cast<NonTypeTemplateParmDecl>(*Param)) {
-      if (!NTTP->hasDefaultArgument())
+      if (!hasVisibleDefaultArgument(NTTP))
         return diagnoseArityMismatch(*this, Template, TemplateLoc, NewArgs);
 
       ExprResult E = SubstDefaultTemplateArgument(*this, Template,
@@ -3832,7 +3832,7 @@ bool Sema::CheckTemplateArgumentList(TemplateDecl *Template,
       TemplateTemplateParmDecl *TempParm
         = cast<TemplateTemplateParmDecl>(*Param);
 
-      if (!TempParm->hasDefaultArgument())
+      if (!hasVisibleDefaultArgument(TempParm))
         return diagnoseArityMismatch(*this, Template, TemplateLoc, NewArgs);
 
       NestedNameSpecifierLoc QualifierLoc;
diff --git a/clang/test/Modules/Inputs/template-default-args/a.h b/clang/test/Modules/Inputs/template-default-args/a.h
index 3e415358243..be760fe6f1d 100644
--- a/clang/test/Modules/Inputs/template-default-args/a.h
+++ b/clang/test/Modules/Inputs/template-default-args/a.h
@@ -3,3 +3,5 @@ template<typename T> struct B {};
 template<typename T> struct C;
 template<typename T> struct D;
 template<typename T> struct E;
+template<typename T = int> struct G;
+template<typename T = int> struct H;
diff --git a/clang/test/Modules/template-default-args.cpp b/clang/test/Modules/template-default-args.cpp
index 97569f0aa33..99f5c6f0590 100644
--- a/clang/test/Modules/template-default-args.cpp
+++ b/clang/test/Modules/template-default-args.cpp
@@ -1,13 +1,12 @@
 // RUN: rm -rf %t
 // RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs/template-default-args -std=c++11 %s
-//
-// expected-no-diagnostics
 
 template<typename T> struct A;
 template<typename T> struct B;
 template<typename T> struct C;
 template<typename T = int> struct D;
 template<typename T = int> struct E {};
+template<typename T> struct H {}; // expected-note {{here}}
 
 #include "b.h"
 
@@ -17,6 +16,7 @@ template<typename T = int> struct B;
 template<typename T = int> struct C;
 template<typename T> struct D {};
 template<typename T> struct F {};
+template<typename T> struct G {}; // expected-note {{here}}
 
 #include "c.h"
 
@@ -26,3 +26,5 @@ extern C<> c;
 D<> d;
 E<> e;
 F<> f;
+G<> g; // expected-error {{too few}}
+H<> h; // expected-error {{too few}}