Template instantiation for unary type traits, e.g., __is_pod

llvm-svn: 72220

2 files changed, 29 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaTemplateInstantiateExpr.cpp b/clang/lib/Sema/SemaTemplateInstantiateExpr.cpp
index 2a1ee886b5d..8cd60edb671 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateExpr.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateExpr.cpp
@@ -90,7 +90,7 @@ namespace {
     OwningExprResult VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E);
     OwningExprResult VisitCXXNewExpr(CXXNewExpr *E);
     OwningExprResult VisitCXXDeleteExpr(CXXDeleteExpr *E);
-    // FIXME: UnaryTypeTraitExpr
+    OwningExprResult VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E);
     // FIXME: QualifiedDeclRefExpr
     OwningExprResult VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E);
     OwningExprResult VisitCXXUnresolvedConstructExpr(
@@ -992,6 +992,23 @@ TemplateExprInstantiator::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
 }
 
 Sema::OwningExprResult 
+TemplateExprInstantiator::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
+  QualType T = SemaRef.InstantiateType(E->getQueriedType(), TemplateArgs,
+                                       /*FIXME*/E->getSourceRange().getBegin(),
+                                       DeclarationName());
+  if (T.isNull())
+    return SemaRef.ExprError();
+
+  SourceLocation FakeLParenLoc
+    = SemaRef.PP.getLocForEndOfToken(E->getSourceRange().getBegin());
+  return SemaRef.ActOnUnaryTypeTrait(E->getTrait(),
+                                     E->getSourceRange().getBegin(),
+                                     /*FIXME*/FakeLParenLoc,
+                                     T.getAsOpaquePtr(),
+                                     E->getSourceRange().getEnd());
+}
+
+Sema::OwningExprResult 
 TemplateExprInstantiator::VisitCXXExprWithTemporaries(
                                                   CXXExprWithTemporaries *E) {
   OwningExprResult SubExpr = Visit(E->getSubExpr());
diff --git a/clang/test/SemaTemplate/instantiate-expr-4.cpp b/clang/test/SemaTemplate/instantiate-expr-4.cpp
index 1511c7aaf8f..5c32d8c1976 100644
--- a/clang/test/SemaTemplate/instantiate-expr-4.cpp
+++ b/clang/test/SemaTemplate/instantiate-expr-4.cpp
@@ -139,3 +139,14 @@ struct Abstract {
 template struct TypeId0<int>;
 template struct TypeId0<Incomplete>;
 template struct TypeId0<Abstract>;
+
+// ---------------------------------------------------------------------
+// type traits
+// ---------------------------------------------------------------------
+template<typename T>
+struct is_pod {
+  static const bool value = __is_pod(T);
+};
+
+static const int is_pod0[is_pod<X>::value? -1 : 1];
+static const int is_pod1[is_pod<Y>::value? 1 : -1];