Don't forget to subtract materialization instructions when computing the offset of the frame pointe…

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 3073 matching lines @@
   intptr_t Length() const;
 
   // The number of real (non-suffix) instructions needed to execute the
   // deoptimization translation.
   intptr_t TranslationLength() const;
 
   // Size of the frame part of the translation not counting kMaterializeObject
   // instructions in the prefix.
   intptr_t FrameSize() const;
 
+  // Returns the number of kMaterializeObject instructions in the prefix.
+  intptr_t NumMaterializations() const;
+
   static RawDeoptInfo* New(intptr_t num_commands);
 
   static const intptr_t kBytesPerElement = (kNumberOfEntries * kWordSize);
   static const intptr_t kMaxElements = kSmiMax / kBytesPerElement;
 
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawDeoptInfo) == OFFSET_OF(RawDeoptInfo, data_));
     return 0;
   }
 
@@ skipping 3517 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_