Reapply r9673 "Scope tree serialization and ScopeIterator cleanup."

src/objects.h

 // Copyright 2011 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 3021 matching lines @@
 
 // This object provides quick access to scope info details for runtime
 // routines w/o the need to explicitly create a ScopeInfo object.
 class SerializedScopeInfo : public FixedArray {
  public :
   static SerializedScopeInfo* cast(Object* object) {
     ASSERT(object->IsSerializedScopeInfo());
     return reinterpret_cast<SerializedScopeInfo*>(object);
   }
 
+  // Return the type of this scope.
+  ScopeType Type();
+
   // Does this scope call eval?
   bool CallsEval();
 
   // Is this scope a strict mode scope?
   bool IsStrictMode();
 
   // Return the number of stack slots for code.
   int NumberOfStackSlots();
 
   // Return the number of context slots for code.
   int NumberOfContextSlots();
 
   // Return if this has context slots besides MIN_CONTEXT_SLOTS;
   bool HasHeapAllocatedLocals();
 
+  // Return if contexts are allocated for this scope.
+  bool HasContext();
+
   // Lookup support for serialized scope info. Returns the
   // the stack slot index for a given slot name if the slot is
   // present; otherwise returns a value < 0. The name must be a symbol
   // (canonicalized).
   int StackSlotIndex(String* name);
 
   // Lookup support for serialized scope info. Returns the
   // context slot index for a given slot name if the slot is present; otherwise
   // returns a value < 0. The name must be a symbol (canonicalized).
   // If the slot is present and mode != NULL, sets *mode to the corresponding
@@ skipping 4587 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_