mem_trace.cc

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/*
 * Copyright (c) 2015 ARM Limited
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 *
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
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#include "mem/probes/mem_trace.hh"
 
#include "base/callback.hh"
#include "base/output.hh"
#include "params/MemTraceProbe.hh"
#include "proto/packet.pb.h"
#include "sim/core.hh"
#include "sim/cur_tick.hh"
#include "sim/system.hh"
 
namespace gem5
{
 
MemTraceProbe::MemTraceProbe(const MemTraceProbeParams &p)
    : BaseMemProbe(p),
      traceStream(nullptr),
      system(p.system),
      withPC(p.with_pc)
{
    std::string filename;
    if (p.trace_file != "") {
        // If the trace file is not specified as an absolute path,
        // append the current simulation output directory
        filename = simout.resolve(p.trace_file);
 
        const std::string suffix = ".gz";
        // If trace_compress has been set, check the suffix. Append
        // accordingly.
        if (p.trace_compress &&
            filename.compare(filename.size() - suffix.size(), suffix.size(),
                             suffix) != 0)
            filename = filename + suffix;
    } else {
        // Generate a filename from the name of the SimObject. Append .trc
        // and .gz if we want compression enabled.
        filename = simout.resolve(name() + ".trc" +
                                  (p.trace_compress ? ".gz" : ""));
    }
 
    traceStream = new ProtoOutputStream(filename);
 
    // Register a callback to compensate for the destructor not
    // being called. The callback forces the stream to flush and
    // closes the output file.
    registerExitCallback([this]() { closeStreams(); });
}
 
void
MemTraceProbe::startup()
{
    // Create a protobuf message for the header and write it to
    // the stream
    ProtoMessage::PacketHeader header_msg;
    header_msg.set_obj_id(name());
    header_msg.set_tick_freq(sim_clock::Frequency);
 
    for (int i = 0; i < system->maxRequestors(); i++) {
        auto id_string = header_msg.add_id_strings();
        id_string->set_key(i);
        id_string->set_value(system->getRequestorName(i));
    }
 
    traceStream->write(header_msg);
}
 
void
MemTraceProbe::closeStreams()
{
    if (traceStream != NULL)
        delete traceStream;
}
 
void
MemTraceProbe::handleRequest(const probing::PacketInfo &pkt_info)
{
    ProtoMessage::Packet pkt_msg;
 
    pkt_msg.set_tick(curTick());
    pkt_msg.set_cmd(pkt_info.cmd.toInt());
    pkt_msg.set_flags(pkt_info.flags);
    pkt_msg.set_addr(pkt_info.addr);
    pkt_msg.set_size(pkt_info.size);
    if (withPC && pkt_info.pc != 0)
        pkt_msg.set_pc(pkt_info.pc);
    pkt_msg.set_pkt_id(pkt_info.id);
 
    traceStream->write(pkt_msg);
}
 
} // namespace gem5