Implement a heap profiler for the Dart managed heap.

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 2783 matching lines @@
   static intptr_t InstanceSize() { return 0; }
 
   static RawSmi* New(intptr_t value) {
     word raw_smi = (value << kSmiTagShift) | kSmiTag;
     ASSERT(ValueFromRaw(raw_smi) == value);
     return reinterpret_cast<RawSmi*>(raw_smi);
   }
 
   static RawClass* Class();
 
-  static intptr_t Value(RawSmi* raw_smi) {
+  static intptr_t Value(const RawSmi* raw_smi) {
     return ValueFromRaw(reinterpret_cast<uword>(raw_smi));
   }
 
   static intptr_t RawValue(intptr_t value) {
     return reinterpret_cast<intptr_t>(New(value));
   }
 
   static bool IsValid(intptr_t value) {
     return (value >= kMinValue) && (value <= kMaxValue);
   }
@@ skipping 2134 matching lines @@
 }
 
 
 intptr_t Stackmap::SizeInBits() const {
   return (Smi::Value(raw_ptr()->bitmap_size_in_bytes_) * kBitsPerByte);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_