vptr.hh revision 5499:8bfc7650c344
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#include "mem/vport.hh" 37 38class ThreadContext; 39 40template <class T> 41class 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 VirtualPort *port = tc->getVirtPort(); 75 port->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__ 138