Implement basic __is_trivial type-trait support, enough to close PR9472.

This introduces a few APIs on the AST to bundle up the standard-based
logic so that programmatic clients have access to exactly the same
behavior.

There is only one serious FIXME here: checking for non-trivial move
constructors and move assignment operators. Those bits need to be added
to the declaration and accessors provided.

This implementation should be enough for the uses of __is_trivial in
libstdc++ 4.6's C++98 library implementation.

Ideas for more thorough test cases or any edge cases missing would be
appreciated. =D

llvm-svn: 130057

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index 89631261dcc..3591c32ad82 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -1266,6 +1266,7 @@ static const char *getTypeTraitName(UnaryTypeTrait UTT) {
   case UTT_IsEnum:                return "__is_enum";
   case UTT_IsPOD:                 return "__is_pod";
   case UTT_IsPolymorphic:         return "__is_polymorphic";
+  case UTT_IsTrivial:             return "__is_trivial";
   case UTT_IsUnion:               return "__is_union";
   }
   return "";