src/cpu/ozone/ea_list.hh

   1 /*
   2  * Copyright (c) 2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Kevin Lim
  29  *          Nathan Binkert
  30  */
  31
  32 #ifndef __CPU_EA_LIST_HH__
  33 #define __CPU_EA_LIST_HH__
  34
  35 #include <list>
  36 #include <utility>
  37
  38 #include "base/types.hh"
  39 #include "cpu/inst_seq.hh"
  40
  41 /**
  42  * Simple class to hold onto a list of pairs, each pair having a memory
  43  * instruction's sequence number and effective addr.  This list can be used
  44  * for memory disambiguation.  However, if I ever want to forward results, I
  45  * may have to use a list that holds DynInstPtrs.  Hence this may change in
  46  * the future.
  47  */
  48 class EAList {
  49   private:
  50     typedef std::pair<InstSeqNum, Addr> instEA;
  51     typedef std::list<instEA>::iterator eaListIt;
  52     typedef std::list<instEA>::const_iterator constEAListIt;
  53
  54     std::list<instEA> eaList;
  55
  56   public:
  57     EAList() { }
  58     ~EAList() { }
  59
  60     void addAddr(const InstSeqNum &new_sn, const Addr &new_ea);
  61
  62     void clearAddr(const InstSeqNum &sn_to_clear, const Addr &ea_to_clear);
  63
  64     /** Checks if any instructions older than check_sn have a conflicting
  65      *  address with check_ea.  Note that this function does not handle the
  66      *  sequence number rolling over.
  67      */
  68     bool checkConflict(const InstSeqNum &check_sn, const Addr &check_ea) const;
  69
  70     void clear();
  71
  72     void commit(const InstSeqNum &commit_sn);
  73 };
  74
  75 #endif // __CPU_EA_LIST_HH__