Introduced TypeFeedbackId and BailoutId types.

src/utils.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 962 matching lines @@
   T Mask(E element) const {
     // The strange typing in ASSERT is necessary to avoid stupid warnings, see:
     // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43680
     ASSERT(element < static_cast<int>(sizeof(T) * CHAR_BIT));
     return 1 << element;
   }
 
   T bits_;
 };
 
+
+class TypeFeedbackId {
+ public:
+  explicit TypeFeedbackId(int id) : id_(id) { }
+  int ToInt() const { return id_; }
+
+  static TypeFeedbackId None() { return TypeFeedbackId(kNoneId); }
+  bool IsNone() const { return id_ == kNoneId; }
+
+ private:
+  static const int kNoneId = -1;
+
+  int id_;
+};
+
+
+class BailoutId {
+ public:
+  explicit BailoutId(int id) : id_(id) { }
+  int ToInt() const { return id_; }
+
+  static BailoutId None() { return BailoutId(kNoneId); }
+  static BailoutId FunctionEntry() { return BailoutId(kFunctionEntryId); }
+  static BailoutId Declarations() { return BailoutId(kDeclarationsId); }
+  static BailoutId FirstUsable() { return BailoutId(kFirstUsableId); }
+
+  bool IsNone() const { return id_ == kNoneId; }
+  bool operator==(const BailoutId& other) const { return id_ == other.id_; }
+
+ private:
+  static const int kNoneId = -1;
+
+  // Using 0 could disguise errors.
+  static const int kFunctionEntryId = 2;
+
+  // This AST id identifies the point after the declarations have been visited.
+  // We need it to capture the environment effects of declarations that emit
+  // code (function declarations).
+  static const int kDeclarationsId = 3;
+
+  // Ever FunctionState starts with this id.
+  static const int kFirstUsableId = 4;
+
+  int id_;
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_