Fix printf formats

src/ast/prettyprinter.h

Index: src/ast/prettyprinter.h
diff --git a/src/ast/prettyprinter.h b/src/ast/prettyprinter.h
index 0186203d27d99a702d22e7ec26d7fb3333b0d2fa..4e90294ca987a9d4b707fb8519608671613219ae 100644
--- a/src/ast/prettyprinter.h
+++ b/src/ast/prettyprinter.h
@@ -7,6 +7,7 @@
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
+#include "src/base/compiler-specific.h"
 
 namespace v8 {
 namespace internal {
@@ -20,7 +21,7 @@ class CallPrinter : public AstVisitor {
   // string. The result string is alive as long as the CallPrinter is alive.
   const char* Print(FunctionLiteral* program, int position);
 
-  void Print(const char* format, ...);
+  void PRINTF_FORMAT(2, 3) Print(const char* format, ...);
 
   void Find(AstNode* node, bool print = false);
 
@@ -62,7 +63,7 @@ class PrettyPrinter: public AstVisitor {
   const char* PrintExpression(FunctionLiteral* program);
   const char* PrintProgram(FunctionLiteral* program);
 
-  void Print(const char* format, ...);
+  void PRINTF_FORMAT(2, 3) Print(const char* format, ...);
 
   // Print a node to stdout.
   static void PrintOut(Isolate* isolate, AstNode* node);