add a NullStmt ast node.

llvm-svn: 39505

clang/AST/StmtPrinter.cpp

@@ -105,6 +105,10 @@ void StmtPrinter::PrintRawCompoundStmt(CompoundStmt *Node) {
   Indent() << "}";
 }
 
+void StmtPrinter::VisitNullStmt(NullStmt *Node) {
+  Indent() << ";\n";
+}
+
 void StmtPrinter::VisitCompoundStmt(CompoundStmt *Node) {
   Indent();
   PrintRawCompoundStmt(Node);

clang/include/clang/AST/Stmt.h

@@ -62,6 +62,22 @@ public:
   static bool classof(const Stmt *) { return true; }
 };
 
+/// NullStmt - This is the null statement ";": C99 6.8.3p3.
+///
+class NullStmt : public Stmt {
+  SourceLocation SemiLoc;
+public:
+  NullStmt(SourceLocation L) : Stmt(NullStmtClass), SemiLoc(L) {}
+
+  SourceLocation getSemiLoc() const { return SemiLoc; }
+  
+  virtual void visit(StmtVisitor &Visitor);
+  static bool classof(const Stmt *T) { 
+    return T->getStmtClass() == NullStmtClass; 
+  }
+  static bool classof(const NullStmt *) { return true; }
+};
+
 /// CompoundStmt - This represents a group of statements like { stmt stmt }.
 ///
 class CompoundStmt : public Stmt {

clang/include/clang/AST/StmtNodes.def

@@ -23,21 +23,22 @@
 
 // Normal Statements.
 FIRST_STMT(1)
-STMT(1, CompoundStmt    , Stmt)
-STMT(2, CaseStmt        , Stmt)
-STMT(3, DefaultStmt     , Stmt)
-STMT(4, LabelStmt       , Stmt)
-STMT(5, IfStmt          , Stmt)
-STMT(6, SwitchStmt      , Stmt)
-STMT(7, WhileStmt       , Stmt)
-STMT(8, DoStmt          , Stmt)
-STMT(9, ForStmt         , Stmt)
-STMT(10, GotoStmt        , Stmt)
-STMT(11, IndirectGotoStmt, Stmt)
-STMT(12, ContinueStmt    , Stmt)
-STMT(13, BreakStmt       , Stmt)
-STMT(14, ReturnStmt      , Stmt)
-LAST_STMT(14)
+STMT( 1, NullStmt        , Stmt)
+STMT( 2, CompoundStmt    , Stmt)
+STMT( 3, CaseStmt        , Stmt)
+STMT( 4, DefaultStmt     , Stmt)
+STMT( 5, LabelStmt       , Stmt)
+STMT( 6, IfStmt          , Stmt)
+STMT( 7, SwitchStmt      , Stmt)
+STMT( 8, WhileStmt       , Stmt)
+STMT( 9, DoStmt          , Stmt)
+STMT(10, ForStmt         , Stmt)
+STMT(11, GotoStmt        , Stmt)
+STMT(12, IndirectGotoStmt, Stmt)
+STMT(13, ContinueStmt    , Stmt)
+STMT(14, BreakStmt       , Stmt)
+STMT(15, ReturnStmt      , Stmt)
+LAST_STMT(15)
 
 FIRST_EXPR(32)
 // Expressions.