*** old/src/share/vm/classfile/classFileStream.cpp	Mon Oct 31 17:46:32 2016
--- new/src/share/vm/classfile/classFileStream.cpp	Mon Oct 31 17:46:32 2016

*** 22,31 ****
--- 22,33 ----
   *
   */
  
  #include "precompiled.hpp"
  #include "classfile/classFileStream.hpp"
+ #include "classfile/classLoader.hpp"
+ #include "classfile/dictionary.hpp"
  #include "classfile/vmSymbols.hpp"
  #include "memory/resourceArea.hpp"
  
  const bool ClassFileStream::verify = true;
  const bool ClassFileStream::no_verification = false;

*** 131,135 ****
--- 133,146 ----
    if (_need_verify) {
      guarantee_more(length * 4, CHECK);
    }
    _current += length * 4;
  }
+ 
+ uint64_t ClassFileStream::compute_fingerprint() const {
+   int classfile_size = length();
+   int classfile_crc = ClassLoader::crc32(0, (const char*)buffer(), length());
+   uint64_t fingerprint = (uint64_t(classfile_size) << 32) | uint64_t(uint32_t(classfile_crc));
+   assert(fingerprint != 0, "must not be zero");
+ 
+   return fingerprint;
+ }