vptr.hh revision 2665:a124942bacb8 
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/vtophys.hh"
35#include "arch/isa_traits.hh"
36
37class ExecContext;
38
39template <class T>
40class VPtr
41{
42  public:
43    typedef T Type;
44
45  private:
46    ExecContext *xc;
47    Addr ptr;
48
49  public:
50    ExecContext *GetXC() const { return xc; }
51    Addr GetPointer() const { return ptr; }
52
53  public:
54    explicit VPtr(ExecContext *_xc, Addr p = 0) : xc(_xc), ptr(p) { }
55    template <class U>
56    VPtr(const VPtr<U> &vp) : xc(vp.GetXC()), ptr(vp.GetPointer()) {}
57    ~VPtr() {}
58
59    bool operator!() const
60    {
61        return ptr == 0;
62    }
63
64    VPtr<T> operator+(int offset)
65    {
66        VPtr<T> ptr(*this);
67        ptr += offset;
68
69        return ptr;
70    }
71
72    const VPtr<T> &operator+=(int offset)
73    {
74        ptr += offset;
75        assert((ptr & (TheISA::PageBytes - 1)) + sizeof(T)
76               < TheISA::PageBytes);
77
78        return *this;
79    }
80
81    const VPtr<T> &operator=(Addr p)
82    {
83        assert((p & (TheISA::PageBytes - 1)) + sizeof(T)
84               < TheISA::PageBytes);
85        ptr = p;
86
87        return *this;
88    }
89
90    template <class U>
91    const VPtr<T> &operator=(const VPtr<U> &vp)
92    {
93        xc = vp.GetXC();
94        ptr = vp.GetPointer();
95
96        return *this;
97    }
98
99    operator T *()
100    {
101        panic("Needs to be rewritten\n");
102/*	void *addr = vtomem(xc, ptr, sizeof(T));
103        return (T *)addr;
104        */
105    }
106
107    T *operator->()
108    {
109        panic("Needs to be rewritten\n");
110/*	void *addr = vtomem(xc, ptr, sizeof(T));
111        return (T *)addr;
112        */
113    }
114
115    T &operator*()
116    {
117        panic("Needs to be rewritten\n");
118/*	void *addr = vtomem(xc, ptr, sizeof(T));
119        return *(T *)addr;
120        */
121    }
122};
123
124#endif // __ARCH_ALPHA_VPTR_HH__
125