src/sim/vptr.hh

   1 /*
   2  * Copyright (c) 2004-2005 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: Nathan Binkert
  29  */
  30
  31 #ifndef __ARCH_ALPHA_VPTR_HH__
  32 #define __ARCH_ALPHA_VPTR_HH__
  33
  34 #include "arch/isa_traits.hh"
  35 #include "arch/vtophys.hh"
  36 #include "mem/fs_translating_port_proxy.hh"
  37
  38 class ThreadContext;
  39
  40 template <class T>
  41 class VPtr
  42 {
  43   public:
  44     typedef T Type;
  45
  46   protected:
  47     ThreadContext *tc;
  48     Addr ptr;
  49     Addr buffer[(sizeof(T)-1)/sizeof(Addr) + 1];
  50
  51   public:
  52     explicit VPtr(ThreadContext *_tc, Addr p = 0)
  53         : tc(_tc), ptr(p)
  54     {
  55         refresh();
  56     }
  57
  58     template <class U>
  59     VPtr(const VPtr<U> &vp)
  60         : tc(vp.tc), ptr(vp.ptr)
  61     {
  62         refresh();
  63     }
  64
  65     ~VPtr()
  66     {}
  67
  68     void
  69     refresh()
  70     {
  71         if (!ptr)
  72             return;
  73
  74         FSTranslatingPortProxy &proxy = tc->getVirtProxy();
  75         proxy.readBlob(ptr, buffer, sizeof(T));
  76     }
  77
  78     bool
  79     operator!() const
  80     {
  81         return ptr == 0;
  82     }
  83
  84     VPtr<T>
  85     operator+(int offset)
  86     {
  87         return VPtr<T>(tc, ptr + offset);
  88     }
  89
  90     const VPtr<T> &
  91     operator+=(int offset)
  92     {
  93         ptr += offset;
  94         refresh();
  95
  96         return *this;
  97     }
  98
  99     const VPtr<T> &
 100     operator=(Addr p)
 101     {
 102         ptr = p;
 103         refresh();
 104
 105         return *this;
 106     }
 107
 108     template <class U>
 109     const VPtr<T> &
 110     operator=(const VPtr<U> &vp)
 111     {
 112         tc = vp.tc;
 113         ptr = vp.ptr;
 114         refresh();
 115
 116         return *this;
 117     }
 118
 119     operator T *()
 120     {
 121         return (T *)buffer;
 122     }
 123
 124     T *
 125     operator->()
 126     {
 127         return (T *)buffer;
 128     }
 129
 130     T &
 131     operator*()
 132     {
 133         return *(T *)buffer;
 134     }
 135 };
 136
 137 #endif // __ARCH_ALPHA_VPTR_HH__