- Allow for experimentation with different header sizes.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 4126 matching lines @@
   // We use 30 bits for the hash code so that we consistently use a
   // 32bit Smi representation for the hash code on all architectures.
   static const intptr_t kHashBits = 30;
 
   static const intptr_t kOneByteChar = 1;
   static const intptr_t kTwoByteChar = 2;
 
   // All strings share the same maximum element count to keep things
   // simple.  We choose a value that will prevent integer overflow for
   // 2 byte strings, since it is the worst case.
-  static const intptr_t kSizeofRawString = sizeof(RawObject) + (2 * kWordSize);
+  static const intptr_t kSizeofRawString =
+      sizeof(RawInstance) + (2 * kWordSize);
   static const intptr_t kMaxElements = kSmiMax / kTwoByteChar;
 
   class CodePointIterator : public ValueObject {
    public:
     explicit CodePointIterator(const String& str)
         : str_(str),
           ch_(0),
           index_(-1),
           end_(str.Length()) {
     }
@@ skipping 624 matching lines @@
     return OFFSET_OF(RawArray, type_arguments_);
   }
 
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawArray) == OFFSET_OF_RETURNED_VALUE(RawArray, data));
     return 0;
   }
 
   static intptr_t InstanceSize(intptr_t len) {
     // Ensure that variable length data is not adding to the object length.
-    ASSERT(sizeof(RawArray) == (sizeof(RawObject) + (2 * kWordSize)));
+    ASSERT(sizeof(RawArray) == (sizeof(RawInstance) + (2 * kWordSize)));
     ASSERT(0 <= len && len <= kMaxElements);
     return RoundedAllocationSize(sizeof(RawArray) + (len * kBytesPerElement));
   }
 
   // Make the array immutable to Dart code by switching the class pointer
   // to ImmutableArray.
   void MakeImmutable() const;
 
   static RawArray* New(intptr_t len, Heap::Space space = Heap::kNew);
 
@@ skipping 857 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_