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/*
* Copyright (c) 2003-2005 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.
*
* Authors: Steve Reinhardt
* Nathan Binkert
*/
#include <iostream>
#include "cpu/static_inst.hh"
#include "sim/core.hh"
StaticInstPtr StaticInst::nullStaticInstPtr;
// Define the decode cache hash map.
StaticInst::DecodeCache StaticInst::decodeCache;
StaticInst::AddrDecodeCache StaticInst::addrDecodeCache;
StaticInst::cacheElement StaticInst::recentDecodes[2];
using namespace std;
StaticInst::~StaticInst()
{
if (cachedDisassembly)
delete cachedDisassembly;
}
void
StaticInst::dumpDecodeCacheStats()
{
cerr << "Decode hash table stats @ " << curTick << ":" << endl;
cerr << "\tnum entries = " << decodeCache.size() << endl;
cerr << "\tnum buckets = " << decodeCache.bucket_count() << endl;
vector<int> hist(100, 0);
int max_hist = 0;
for (int i = 0; i < decodeCache.bucket_count(); ++i) {
int count = decodeCache.elems_in_bucket(i);
if (count > max_hist)
max_hist = count;
hist[count]++;
}
for (int i = 0; i <= max_hist; ++i) {
cerr << "\tbuckets of size " << i << " = " << hist[i] << endl;
}
}
bool
StaticInst::hasBranchTarget(const TheISA::PCState &pc, ThreadContext *tc,
TheISA::PCState &tgt) const
{
if (isDirectCtrl()) {
tgt = branchTarget(pc);
return true;
}
if (isIndirectCtrl()) {
tgt = branchTarget(tc);
return true;
}
return false;
}
StaticInstPtr
StaticInst::fetchMicroop(MicroPC upc) const
{
panic("StaticInst::fetchMicroop() called on instruction "
"that is not microcoded.");
}
TheISA::PCState
StaticInst::branchTarget(const TheISA::PCState &pc) const
{
panic("StaticInst::branchTarget() called on instruction "
"that is not a PC-relative branch.");
M5_DUMMY_RETURN;
}
TheISA::PCState
StaticInst::branchTarget(ThreadContext *tc) const
{
panic("StaticInst::branchTarget() called on instruction "
"that is not an indirect branch.");
M5_DUMMY_RETURN;
}
const string &
StaticInst::disassemble(Addr pc, const SymbolTable *symtab) const
{
if (!cachedDisassembly)
cachedDisassembly = new string(generateDisassembly(pc, symtab));
return *cachedDisassembly;
}
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