Fix printf formats

src/log.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_LOG_H_
 #define V8_LOG_H_
 
 #include <string>
 
 #include "src/allocation.h"
+#include "src/base/compiler-specific.h"
 #include "src/base/platform/elapsed-timer.h"
 #include "src/base/platform/platform.h"
 #include "src/objects.h"
 
 namespace v8 {
 
 namespace base {
 class Semaphore;
 }
 
@@ skipping 326 matching lines @@
 
   // Used for logging stubs found in the snapshot.
   void LogCodeObject(Object* code_object);
 
   // Helper method. It resets name_buffer_ and add tag name into it.
   void InitNameBuffer(LogEventsAndTags tag);
 
   // Emits a profiler tick event. Used by the profiler thread.
   void TickEvent(TickSample* sample, bool overflow);
 
-  void ApiEvent(const char* name, ...);
+  PRINTF_FORMAT(2, 3) void ApiEvent(const char* format, ...);
 
   // Logs a StringEvent regardless of whether FLAG_log is true.
   void UncheckedStringEvent(const char* name, const char* value);
 
   // Logs an IntEvent regardless of whether FLAG_log is true.
   void UncheckedIntEvent(const char* name, int value);
   void UncheckedIntPtrTEvent(const char* name, intptr_t value);
 
   Isolate* isolate_;
 
@@ skipping 154 matching lines @@
 
   NameBuffer* name_buffer_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 
 #endif  // V8_LOG_H_