Introduce the notion of literal types, as specified in C++0x.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90361 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 37 insertions, 0 deletions

diff --git a/lib/AST/ExprCXX.cpp b/lib/AST/ExprCXX.cpp
index 7a6fbdca8b..a9f96adae1 100644
--- a/lib/AST/ExprCXX.cpp
+++ b/lib/AST/ExprCXX.cpp
@@ -199,6 +199,7 @@ bool UnaryTypeTraitExpr::EvaluateTrait(ASTContext& C) const {
   switch(UTT) {
   default: assert(false && "Unknown type trait or not implemented");
   case UTT_IsPOD: return QueriedType->isPODType();
+  case UTT_IsLiteral: return QueriedType->isLiteralType();
   case UTT_IsClass: // Fallthrough
   case UTT_IsUnion:
     if (const RecordType *Record = QueriedType->getAs<RecordType>()) {
diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp
index 5a2434da3c..70387c73a7 100644
--- a/lib/AST/Type.cpp
+++ b/lib/AST/Type.cpp
@@ -639,6 +639,40 @@ bool Type::isPODType() const {
   }
 }
 
+bool Type::isLiteralType() const {
+  if (isIncompleteType())
+    return false;
+
+  // C++0x [basic.types]p10:
+  //   A type is a literal type if it is:
+  switch (CanonicalType->getTypeClass()) {
+    // We're whitelisting
+  default: return false;
+
+    //   -- a scalar type
+  case Builtin:
+  case Complex:
+  case Pointer:
+  case MemberPointer:
+  case Vector:
+  case ExtVector:
+  case ObjCObjectPointer:
+  case Enum:
+    return true;
+
+    //   -- a class type with ...
+  case Record:
+    // FIXME: Do the tests
+    return false;
+
+    //   -- an array of literal type
+    // Extension: variable arrays cannot be literal types, since they're
+    // runtime-sized.
+  case ConstantArray:
+    return cast<ArrayType>(CanonicalType)->getElementType()->isLiteralType();
+  }
+}
+
 bool Type::isPromotableIntegerType() const {
   if (const BuiltinType *BT = getAs<BuiltinType>())
     switch (BT->getKind()) {
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index f780cf1a60..7b8bc3e845 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -826,6 +826,7 @@ Parser::OwningExprResult Parser::ParseCastExpression(bool isUnaryExpression,
   case tok::kw___is_empty:
   case tok::kw___is_polymorphic:
   case tok::kw___is_abstract:
+  case tok::kw___is_literal:
   case tok::kw___has_trivial_constructor:
   case tok::kw___has_trivial_copy:
   case tok::kw___has_trivial_assign:
diff --git a/lib/Parse/ParseExprCXX.cpp b/lib/Parse/ParseExprCXX.cpp
index 52003e6fa1..4eb6cd5daa 100644
--- a/lib/Parse/ParseExprCXX.cpp
+++ b/lib/Parse/ParseExprCXX.cpp
@@ -1459,6 +1459,7 @@ static UnaryTypeTrait UnaryTypeTraitFromTokKind(tok::TokenKind kind) {
   case tok::kw___is_pod:                  return UTT_IsPOD;
   case tok::kw___is_polymorphic:          return UTT_IsPolymorphic;
   case tok::kw___is_union:                return UTT_IsUnion;
+  case tok::kw___is_literal:              return UTT_IsLiteral;
   }
 }