74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
/*
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* Copyright (c) 2004-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "cpu/beta_cpu/ras.hh"
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ReturnAddrStack::ReturnAddrStack(unsigned _numEntries)
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: numEntries(_numEntries), usedEntries(0),
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tos(0)
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{
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addrStack = new Addr[numEntries];
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for (int i = 0; i < numEntries; ++i)
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addrStack[i] = 0;
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}
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void
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ReturnAddrStack::push(const Addr &return_addr)
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{
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incrTos();
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addrStack[tos] = return_addr;
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if (usedEntries != numEntries) {
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++usedEntries;
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}
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}
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void
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ReturnAddrStack::pop()
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{
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// Not sure it's possible to really track usedEntries properly.
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// assert(usedEntries > 0);
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if (usedEntries > 0) {
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--usedEntries;
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}
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decrTos();
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}
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void
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ReturnAddrStack::restore(unsigned top_entry_idx,
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const Addr &restored_target)
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{
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tos = top_entry_idx;
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addrStack[tos] = restored_target;
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}
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