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/*
* Copyright (c) 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.
*/
#include "cpu/profile.hh"
#include <string>
#include "base/callback.hh"
#include "base/loader/symtab.hh"
#include "base/statistics.hh"
#include "base/trace.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
namespace gem5
{
void
BaseStackTrace::dump()
{
StringWrap name(tc->getCpuPtr()->name());
auto *symtab = &tc->getSystemPtr()->workload->symtab(tc);
DPRINTFN("------ Stack ------\n");
std::string symbol;
for (int i = 0, size = stack.size(); i < size; ++i) {
Addr addr = stack[size - i - 1];
getSymbol(symbol, addr, symtab);
DPRINTFN("%#x: %s\n", addr, symbol);
}
}
bool
BaseStackTrace::tryGetSymbol(std::string &symbol, Addr addr,
const loader::SymbolTable *symtab)
{
const auto it = symtab->find(addr);
if (it == symtab->end())
return false;
symbol = it->name;
return true;
}
void
ProfileNode::dump(const std::string &symbol, uint64_t id,
const FunctionProfile &prof, std::ostream &os) const
{
ccprintf(os, "%#x %s %d ", id, symbol, count);
for (const auto &p: children)
ccprintf(os, "%#x ", (intptr_t)(p.second));
ccprintf(os, "\n");
for (const auto &p: children) {
Addr addr = p.first;
std::string symbol;
prof.trace->getSymbol(symbol, addr, &prof.symtab);
const auto *node = p.second;
node->dump(symbol, (intptr_t)node, prof, os);
}
}
void
ProfileNode::clear()
{
count = 0;
for (const auto &p: children)
p.second->clear();
}
FunctionProfile::FunctionProfile(std::unique_ptr<BaseStackTrace> _trace,
const loader::SymbolTable &_symtab) :
symtab(_symtab), trace(std::move(_trace))
{
statistics::registerResetCallback([this]() { clear(); });
}
ProfileNode *
FunctionProfile::consume(const std::vector<Addr> &stack)
{
ProfileNode *current = &top;
for (int i = 0, size = stack.size(); i < size; ++i) {
ProfileNode *&ptr = current->children[stack[size - i - 1]];
if (!ptr)
ptr = new ProfileNode;
current = ptr;
}
return current;
}
void
FunctionProfile::clear()
{
top.clear();
pc_count.clear();
}
void
FunctionProfile::dump(std::ostream &os) const
{
ccprintf(os, ">>>PC data\n");
for (const auto &p: pc_count) {
Addr pc = p.first;
Counter count = p.second;
std::string symbol;
if (trace->tryGetSymbol(symbol, pc, &symtab))
ccprintf(os, "%s %d\n", symbol, count);
else
ccprintf(os, "%#x %d\n", pc, count);
}
ccprintf(os, ">>>function data\n");
top.dump("top", 0, *this, os);
}
void
FunctionProfile::sample(ProfileNode *node, Addr pc)
{
node->count++;
auto it = symtab.findNearest(pc);
if (it != symtab.end()) {
pc_count[it->address]++;
} else {
// record PC even if we don't have a symbol to avoid
// silently biasing the histogram
pc_count[pc]++;
}
}
} // namespace gem5