Fix for issue 2233

vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 6905 matching lines @@
 
 RawBigint* Bigint::Allocate(intptr_t length, Heap::Space space) {
   ASSERT(length >= 0);
   Isolate* isolate = Isolate::Current();
   const Class& cls = Class::Handle(isolate->object_store()->bigint_class());
   Bigint& result = Bigint::Handle();
   {
     RawObject* raw = Object::Allocate(cls, Bigint::InstanceSize(length), space);
     NoGCScope no_gc;
     result ^= raw;
-    result.raw_ptr()->allocated_length_ = length;
-    result.raw_ptr()->signed_length_ = length;
+    result.raw_ptr()->allocated_length_ = length;  // Chunk length allocated.
+    result.raw_ptr()->signed_length_ = length;  // Chunk length in use.
   }
   return result.raw();
 }
 
 
 static uword ZoneAllocator(intptr_t size) {
   Zone* zone = Isolate::Current()->current_zone();
   return zone->Allocate(size);
 }
 
@@ skipping 2019 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart