vptr.hh revision 14020 
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 "mem/fs_translating_port_proxy.hh"
35
36class ThreadContext;
37
38template <class T>
39class VPtr
40{
41  public:
42    typedef T Type;
43
44  protected:
45    ThreadContext *tc;
46    Addr ptr;
47    Addr buffer[(sizeof(T)-1)/sizeof(Addr) + 1];
48
49  public:
50    explicit VPtr(ThreadContext *_tc, Addr p = 0)
51        : tc(_tc), ptr(p)
52    {
53        refresh();
54    }
55
56    template <class U>
57    VPtr(const VPtr<U> &vp)
58        : tc(vp.tc), ptr(vp.ptr)
59    {
60        refresh();
61    }
62
63    ~VPtr()
64    {}
65
66    void
67    refresh()
68    {
69        if (!ptr)
70            return;
71
72        PortProxy &proxy = tc->getVirtProxy();
73        proxy.readBlob(ptr, buffer, sizeof(T));
74    }
75
76    bool
77    operator!() const
78    {
79        return ptr == 0;
80    }
81
82    VPtr<T>
83    operator+(int offset)
84    {
85        return VPtr<T>(tc, ptr + offset);
86    }
87
88    const VPtr<T> &
89    operator+=(int offset)
90    {
91        ptr += offset;
92        refresh();
93
94        return *this;
95    }
96
97    const VPtr<T> &
98    operator=(Addr p)
99    {
100        ptr = p;
101        refresh();
102
103        return *this;
104    }
105
106    template <class U>
107    const VPtr<T> &
108    operator=(const VPtr<U> &vp)
109    {
110        tc = vp.tc;
111        ptr = vp.ptr;
112        refresh();
113
114        return *this;
115    }
116
117    operator T *()
118    {
119        return (T *)buffer;
120    }
121
122    T *
123    operator->()
124    {
125        return (T *)buffer;
126    }
127
128    T &
129    operator*()
130    {
131        return *(T *)buffer;
132    }
133};
134
135#endif // __ARCH_ALPHA_VPTR_HH__
136