vptr.hh revision 2170 
15795Ssaidi@eecs.umich.edu/*
25795Ssaidi@eecs.umich.edu * Copyright (c) 2004-2005 The Regents of The University of Michigan
35795Ssaidi@eecs.umich.edu * All rights reserved.
45795Ssaidi@eecs.umich.edu *
55795Ssaidi@eecs.umich.edu * Redistribution and use in source and binary forms, with or without
65795Ssaidi@eecs.umich.edu * modification, are permitted provided that the following conditions are
75795Ssaidi@eecs.umich.edu * met: redistributions of source code must retain the above copyright
85795Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer;
95795Ssaidi@eecs.umich.edu * redistributions in binary form must reproduce the above copyright
105795Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the
115795Ssaidi@eecs.umich.edu * documentation and/or other materials provided with the distribution;
125795Ssaidi@eecs.umich.edu * neither the name of the copyright holders nor the names of its
135795Ssaidi@eecs.umich.edu * contributors may be used to endorse or promote products derived from
145795Ssaidi@eecs.umich.edu * this software without specific prior written permission.
155795Ssaidi@eecs.umich.edu *
165795Ssaidi@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
175795Ssaidi@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
185795Ssaidi@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
195795Ssaidi@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
205795Ssaidi@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
215795Ssaidi@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
225795Ssaidi@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
235795Ssaidi@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
245795Ssaidi@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
255795Ssaidi@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
265795Ssaidi@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
275795Ssaidi@eecs.umich.edu */
285795Ssaidi@eecs.umich.edu
295795Ssaidi@eecs.umich.edu#ifndef __ARCH_ALPHA_VPTR_HH__
305795Ssaidi@eecs.umich.edu#define __ARCH_ALPHA_VPTR_HH__
315795Ssaidi@eecs.umich.edu
328229Snate@binkert.org#include "arch/vtophys.hh"
335795Ssaidi@eecs.umich.edu#include "arch/isa_traits.hh"
345795Ssaidi@eecs.umich.edu
355795Ssaidi@eecs.umich.educlass ExecContext;
365795Ssaidi@eecs.umich.edu
375795Ssaidi@eecs.umich.edutemplate <class T>
385795Ssaidi@eecs.umich.educlass VPtr
395795Ssaidi@eecs.umich.edu{
405795Ssaidi@eecs.umich.edu  public:
415795Ssaidi@eecs.umich.edu    typedef T Type;
425795Ssaidi@eecs.umich.edu
435795Ssaidi@eecs.umich.edu  private:
445795Ssaidi@eecs.umich.edu    ExecContext *xc;
45    Addr ptr;
46
47  public:
48    ExecContext *GetXC() const { return xc; }
49    Addr GetPointer() const { return ptr; }
50
51  public:
52    explicit VPtr(ExecContext *_xc, Addr p = 0) : xc(_xc), ptr(p) { }
53    template <class U>
54    VPtr(const VPtr<U> &vp) : xc(vp.GetXC()), ptr(vp.GetPointer()) {}
55    ~VPtr() {}
56
57    bool operator!() const
58    {
59        return ptr == 0;
60    }
61
62    VPtr<T> operator+(int offset)
63    {
64        VPtr<T> ptr(*this);
65        ptr += offset;
66
67        return ptr;
68    }
69
70    const VPtr<T> &operator+=(int offset)
71    {
72        ptr += offset;
73        assert((ptr & (TheISA::PageBytes - 1)) + sizeof(T)
74               < TheISA::PageBytes);
75
76        return *this;
77    }
78
79    const VPtr<T> &operator=(Addr p)
80    {
81        assert((p & (TheISA::PageBytes - 1)) + sizeof(T)
82               < TheISA::PageBytes);
83        ptr = p;
84
85        return *this;
86    }
87
88    template <class U>
89    const VPtr<T> &operator=(const VPtr<U> &vp)
90    {
91        xc = vp.GetXC();
92        ptr = vp.GetPointer();
93
94        return *this;
95    }
96
97    operator T *()
98    {
99        void *addr = vtomem(xc, ptr, sizeof(T));
100        return (T *)addr;
101    }
102
103    T *operator->()
104    {
105        void *addr = vtomem(xc, ptr, sizeof(T));
106        return (T *)addr;
107    }
108
109    T &operator*()
110    {
111        void *addr = vtomem(xc, ptr, sizeof(T));
112        return *(T *)addr;
113    }
114};
115
116#endif // __ARCH_ALPHA_VPTR_HH__
117