src/cpu/decode.hh

   1 /*
   2  * Copyright (c) 2011 Google
   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: Gabe Black
  29  */
  30
  31 #ifndef __CPU_DECODE_HH__
  32 #define __CPU_DECODE_HH__
  33
  34 #include "arch/isa_traits.hh"
  35 #include "arch/types.hh"
  36 #include "config/the_isa.hh"
  37 #include "cpu/decode_cache.hh"
  38 #include "cpu/static_inst.hh"
  39
  40 /// The decoder class. This class doesn't do much of anything now, but in the
  41 /// future it will be redefinable per ISA and allow more interesting behavior.
  42 class Decoder
  43 {
  44   protected:
  45     /// A cache of decoded instruction objects.
  46     static DecodeCache<TheISA::decodeInst> cache;
  47
  48   public:
  49     /// Decode a machine instruction.
  50     /// @param mach_inst The binary instruction to decode.
  51     /// @retval A pointer to the corresponding StaticInst object.
  52     StaticInstPtr
  53     decode(TheISA::ExtMachInst mach_inst, Addr addr)
  54     {
  55         return cache.decode(mach_inst, addr);
  56     }
  57 };
  58
  59 #endif // __CPU_DECODE_HH__