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-rw-r--r--sim/vptr.hh114
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+/*
+ * Copyright (c) 2004-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __ARCH_ALPHA_VPTR_HH__
+#define __ARCH_ALPHA_VPTR_HH__
+
+#include "arch/alpha/vtophys.hh"
+
+class ExecContext;
+
+template <class T>
+class VPtr
+{
+ public:
+ typedef T Type;
+
+ private:
+ ExecContext *xc;
+ Addr ptr;
+
+ public:
+ ExecContext *GetXC() const { return xc; }
+ Addr GetPointer() const { return ptr; }
+
+ public:
+ explicit VPtr(ExecContext *_xc, Addr p = 0) : xc(_xc), ptr(p) { }
+ template <class U>
+ VPtr(const VPtr<U> &vp) : xc(vp.GetXC()), ptr(vp.GetPointer()) {}
+ ~VPtr() {}
+
+ bool operator!() const
+ {
+ return ptr == 0;
+ }
+
+ VPtr<T> operator+(int offset)
+ {
+ VPtr<T> ptr(*this);
+ ptr += offset;
+
+ return ptr;
+ }
+
+ const VPtr<T> &operator+=(int offset)
+ {
+ ptr += offset;
+ assert((ptr & (AlphaISA::PageBytes - 1)) + sizeof(T)
+ < AlphaISA::PageBytes);
+
+ return *this;
+ }
+
+ const VPtr<T> &operator=(Addr p)
+ {
+ assert((p & (AlphaISA::PageBytes)) + sizeof(T) < AlphaISA::PageBytes);
+ ptr = p;
+
+ return *this;
+ }
+
+ template <class U>
+ const VPtr<T> &operator=(const VPtr<U> &vp)
+ {
+ xc = vp.GetXC();
+ ptr = vp.GetPointer();
+
+ return *this;
+ }
+
+ operator T *()
+ {
+ void *addr = vtomem(xc, ptr, sizeof(T));
+ return (T *)addr;
+ }
+
+ T *operator->()
+ {
+ void *addr = vtomem(xc, ptr, sizeof(T));
+ return (T *)addr;
+ }
+
+ T &operator*()
+ {
+ void *addr = vtomem(xc, ptr, sizeof(T));
+ return *(T *)addr;
+ }
+};
+
+#endif // __ARCH_ALPHA_VPTR_HH__