hotspot/src/share/vm/classfile/altHashing.hpp
author hseigel
Mon, 10 Oct 2016 08:34:32 -0400
changeset 41691 1be281ee5de4
parent 40900 95cf311c72f8
permissions -rw-r--r--
8166364: fatal error: acquiring lock DirtyCardQ_CBL_mon/16 out of order with lock Module_lock/6 -- possible deadlock Summary: Set the mirror's module field outside of the module lock. Reviewed-by: dsamersoff, dholmes, rehn

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP
#define SHARE_VM_CLASSFILE_ALTHASHING_HPP

#include "prims/jni.h"
#include "classfile/symbolTable.hpp"

/**
 * Hashing utilities.
 *
 * Implementation of Murmur3 hashing.
 * This code was translated from src/share/classes/sun/misc/Hashing.java
 * code in the JDK.
 */

class AltHashing : AllStatic {
  friend class AltHashingTest;

  // utility function copied from java/lang/Integer
  static juint Integer_rotateLeft(juint i, int distance) {
    return (i << distance) | (i >> (32 - distance));
  }
  static juint murmur3_32(const int* data, int len);
  static juint murmur3_32(juint seed, const int* data, int len);

 public:
  static juint compute_seed();
  static juint murmur3_32(juint seed, const jbyte* data, int len);
  static juint murmur3_32(juint seed, const jchar* data, int len);
};
#endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP