vptr.hh revision 712
1/* 2 * Copyright (c) 2003 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 29#ifndef __VPTR_HH__ 30#define __VPTR_HH__ 31 32#include "arch/alpha/vtophys.hh" 33 34class ExecContext; 35 36template <class T> 37class VPtr 38{ 39 public: 40 typedef T Type; 41 42 private: 43 ExecContext *xc; 44 Addr ptr; 45 46 public: 47 ExecContext *GetXC() const { return xc; } 48 Addr GetPointer() const { return ptr; } 49 50 public: 51 explicit VPtr(ExecContext *_xc, Addr p = 0) : xc(_xc), ptr(p) { } 52 template <class U> 53 VPtr(const VPtr<U> &vp) : xc(vp.GetXC()), ptr(vp.GetPointer()) {} 54 ~VPtr() {} 55 56 bool operator!() const 57 { 58 return ptr == 0; 59 } 60 61 VPtr<T> operator+(int offset) 62 { 63 VPtr<T> ptr(*this); 64 ptr += offset; 65 66 return ptr; 67 } 68 69 const VPtr<T> &operator+=(int offset) 70 { 71 ptr += offset; 72 assert((ptr & (ALPHA_PGBYTES - 1)) + sizeof(T) < ALPHA_PGBYTES); 73 74 return *this; 75 } 76 77 const VPtr<T> &operator=(Addr p) 78 { 79 assert((p & (ALPHA_PGBYTES - 1)) + sizeof(T) < ALPHA_PGBYTES); 80 ptr = p; 81 82 return *this; 83 } 84 85 template <class U> 86 const VPtr<T> &operator=(const VPtr<U> &vp) 87 { 88 xc = vp.GetXC(); 89 ptr = vp.GetPointer(); 90 91 return *this; 92 } 93 94 operator T *() 95 { 96 void *addr = vtomem(xc, ptr, sizeof(T)); 97 return (T *)addr; 98 } 99 100 T *operator->() 101 { 102 void *addr = vtomem(xc, ptr, sizeof(T)); 103 return (T *)addr; 104 } 105 106 T &operator*() 107 { 108 void *addr = vtomem(xc, ptr, sizeof(T)); 109 return *(T *)addr; 110 } 111}; 112 113#endif // __VPTR_HH__ 114