Fix an off-by-one error in the stack frame iteration.

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 2240 matching lines @@
   HEAP_OBJECT_IMPLEMENTATION(PcDescriptors, Object);
   friend class Class;
 };
 
 
 class Stackmap : public Object {
  public:
   static const intptr_t kNoMaximum = -1;
   static const intptr_t kNoMinimum = -1;
 
-  bool IsObject(intptr_t offset) const {
-    return InRange(offset) && GetBit(offset);
+  bool IsObject(intptr_t index) const {
+    return InRange(index) && GetBit(index);
   }
   uword PC() const { return raw_ptr()->pc_; }
   void SetPC(uword value) const { raw_ptr()->pc_ = value; }
 
   RawCode* GetCode() const { return raw_ptr()->code_; }
   void SetCode(const Code& code) const;
 
-  // Return the offset of the highest stack slot that has an object.
-  intptr_t MaximumBitOffset() const { return raw_ptr()->max_set_bit_offset_; }
+  // Return the index of the highest stack slot that has an object.
+  intptr_t MaximumBitIndex() const { return raw_ptr()->max_set_bit_index_; }
 
-  // Return the offset of the lowest stack slot that has an object.
-  intptr_t MinimumBitOffset() const { return raw_ptr()->min_set_bit_offset_; }
+  // Return the index of the lowest stack slot that has an object.
+  intptr_t MinimumBitIndex() const { return raw_ptr()->min_set_bit_index_; }
 
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawStackmap) == OFFSET_OF(RawStackmap, data_));
     return 0;
   }
   static intptr_t InstanceSize(intptr_t size) {
     return RoundedAllocationSize(sizeof(RawStackmap) + (size * kWordSize));
   }
   static RawStackmap* New(uword pc, BitmapBuilder* bmap);
 
  private:
   inline intptr_t SizeInBits() const;
 
-  void SetMinBitOffset(intptr_t value) const {
-    raw_ptr()->min_set_bit_offset_ = value;
+  void SetMinBitIndex(intptr_t value) const {
+    raw_ptr()->min_set_bit_index_ = value;
   }
-  void SetMaxBitOffset(intptr_t value) const {
-    raw_ptr()->max_set_bit_offset_ = value;
+  void SetMaxBitIndex(intptr_t value) const {
+    raw_ptr()->max_set_bit_index_ = value;
   }
 
-  bool InRange(intptr_t offset) const { return offset < SizeInBits(); }
+  bool InRange(intptr_t index) const { return index < SizeInBits(); }
 
-  bool GetBit(intptr_t bit_offset) const;
-  void SetBit(intptr_t bit_offset, bool value) const;
+  bool GetBit(intptr_t bit_index) const;
+  void SetBit(intptr_t bit_index, bool value) const;
 
   void set_bitmap_size_in_bytes(intptr_t value) const;
 
   HEAP_OBJECT_IMPLEMENTATION(Stackmap, Object);
   friend class BitmapBuilder;
   friend class Class;
 };
 
 
 class ExceptionHandlers : public Object {
@@ skipping 2899 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_