Parse the noexcept operator and stub out sema.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113622 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/TokenKinds.def

@@ -278,6 +278,7 @@ KEYWORD(char16_t                    , KEYCXX0X)
 KEYWORD(char32_t                    , KEYCXX0X)
 KEYWORD(constexpr                   , KEYCXX0X)
 KEYWORD(decltype                    , KEYCXX0X)
+KEYWORD(noexcept                    , KEYCXX0X)
 KEYWORD(nullptr                     , KEYCXX0X)
 KEYWORD(static_assert               , KEYCXX0X)
 KEYWORD(thread_local                , KEYCXX0X)

include/clang/Sema/Sema.h

@@ -2249,6 +2249,9 @@ public:
                                     SourceLocation StmtLoc,
                                     bool ConvertToBoolean);
 
+  ExprResult ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
+                               Expr *Operand, SourceLocation RParen);
+
   /// ActOnUnaryTypeTrait - Parsed one of the unary type trait support
   /// pseudo-functions.
   ExprResult ActOnUnaryTypeTrait(UnaryTypeTrait OTT,

lib/Parse/ParseExpr.cpp

@@ -457,6 +457,7 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
 /// [GNU]   '&&' identifier
 /// [C++]   new-expression
 /// [C++]   delete-expression
+/// [C++0x] 'noexcept' '(' expression ')'
 ///
 ///       unary-operator: one of
 ///         '&'  '*'  '+'  '-'  '~'  '!'
@@ -546,9 +547,9 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
 ///                   '__is_base_of'                          [TODO]
 ///
 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
-                                                     bool isAddressOfOperand,
-                                                     bool &NotCastExpr,
-                                                     ParsedType TypeOfCast) {
+                                       bool isAddressOfOperand,
+                                       bool &NotCastExpr,
+                                       ParsedType TypeOfCast) {
   ExprResult Res;
   tok::TokenKind SavedKind = Tok.getKind();
   NotCastExpr = false;
@@ -891,6 +892,19 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
   case tok::kw_delete: // [C++] delete-expression
     return ParseCXXDeleteExpression(false, Tok.getLocation());
 
+  case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
+    SourceLocation KeyLoc = ConsumeToken();
+    SourceLocation LParen = Tok.getLocation();
+    if (ExpectAndConsume(tok::l_paren,
+                         diag::err_expected_lparen_after, "noexcept"))
+      return ExprError();
+    ExprResult Result = ParseExpression();
+    SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen);
+    if (!Result.isInvalid())
+      Result = Actions.ActOnNoexceptExpr(KeyLoc, LParen, Result.take(), RParen);
+    return move(Result);
+  }
+
   case tok::kw___is_pod: // [GNU] unary-type-trait
   case tok::kw___is_class:
   case tok::kw___is_enum:

lib/Sema/SemaExprCXX.cpp

@@ -3114,6 +3114,17 @@ CXXMemberCallExpr *Sema::BuildCXXMemberCallExpr(Expr *Exp,
   return CE;
 }
 
+ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation LParen,
+                                   Expr *Operand, SourceLocation RParen) {
+  // C++ [expr.unary.noexcept]p1:
+  //   The noexcept operator determines whether the evaluation of its operand,
+  //   which is an unevaluated operand, can throw an exception.
+  ExprEvalContexts.back().Context = Unevaluated;
+
+//return Owned(new (Context) CXXNoexceptExpr(KeyLoc, LParen, Operand, RParen));
+  return ExprError();
+}
+
 ExprResult Sema::ActOnFinishFullExpr(Expr *FullExpr) {
   if (!FullExpr) return ExprError();
   return MaybeCreateCXXExprWithTemporaries(FullExpr);