gem5/util/encode_inst_dep_trace.py

#!/usr/bin/env python

# Copyright (c) 2015 ARM Limited
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# Copyright 2008 Google Inc.  All rights reserved.
# http://code.google.com/p/protobuf/
#
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# 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 Google Inc. 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: Radhika Jagtap
#

# This script is used to dump ASCII traces of the instruction dependency
# graph to protobuf format.
#
# The ASCII trace format uses one line per instruction with the format
# instruction sequence number, (optional) pc, (optional) weight, load, store,
# (optional) flags, (optional) addr, (optional) size, comp delay,
# (repeated) order dependencies comma-separated, and (repeated) register
# dependencies comma-separated.
#
# examples:
# seq_num,[pc],[weight,]load,store,[address,size,flags,]comp_delay:[rob_dep]:
# [reg_dep]
# 1,1,False,False,8500::
# 2,1,False,False,1000:,1:
# 3,1,True,False,831248,4,74,500:,2:
# 4,1,False,False,0:,2:
# 5,1,False,False,500::,4
# 6,1,False,True,831248,4,74,1000:,3:,4,5

import protolib
import sys

# Import the packet proto definitions. If they are not found, attempt
# to generate them automatically. This assumes that the script is
# executed from the gem5 root.
try:
    import inst_dep_record_pb2
except:
    print "Did not find proto definition, attempting to generate"
    from subprocess import call
    error = call(['protoc', '--python_out=util', '--proto_path=src/proto',
                  'src/proto/inst_dep_record.proto'])
    if not error:
        import inst_dep_record_pb2
        print "Generated proto definitions for instruction dependency record"
    else:
        print "Failed to import proto definitions"
        exit(-1)

def main():
    if len(sys.argv) != 3:
        print "Usage: ", sys.argv[0], " <ASCII input> <protobuf output>"
        exit(-1)

    # Open the file in write mode
    proto_out = open(sys.argv[2], 'wb')

    # Open the file in read mode
    try:
        ascii_in = open(sys.argv[1], 'r')
    except IOError:
        print "Failed to open ", sys.argv[1], " for reading"
        exit(-1)

    # Write the magic number in 4-byte Little Endian, similar to what
    # is done in src/proto/protoio.cc
    proto_out.write("gem5")

    # Add the packet header
    header = inst_dep_record_pb2.InstDepRecordHeader()
    header.obj_id = "Converted ASCII trace " + sys.argv[1]
    # Assume the default tick rate
    header.tick_freq = 1000000000
    header.window_size = 120
    protolib.encodeMessage(proto_out, header)

    num_records = 0
    # For each line in the ASCII trace, create a packet message and
    # write it to the encoded output
    for line in ascii_in:
        inst_info_str, rob_dep_str, reg_dep_str = (line.strip()).split(':')
        inst_info_list = inst_info_str.split(',')
        dep_record = inst_dep_record_pb2.InstDepRecord()

        dep_record.seq_num = long(inst_info_list[0])
        dep_record.pc = long(inst_info_list[1])
        dep_record.weight = long(inst_info_list[2])
        dep_record.load = True if inst_info_list[3] == 'True' else  False
        dep_record.store = True if inst_info_list[4] == 'True' else  False

        # If the instruction is a load or store record the addr, size flags
        # in addition to recording the computation delay
        if dep_record.load or dep_record.store:
            addr, size, flags, comp_delay = inst_info_list[5:9]
            dep_record.addr = long(addr)
            dep_record.size = int(size)
            dep_record.flags = int(flags)
            dep_record.comp_delay = long(comp_delay)
        elif not dep_record.load and not dep_record.store:
            comp_delay = inst_info_list[4]
            dep_record.comp_delay = long(comp_delay)
        else:
            print "Fatal:", seq_num, "is both load and store"
            exit(1)

        # Parse the register and order dependencies both of which are
        # repeated fields. An empty list is valid.
        rob_deps = rob_dep_str.strip().split(',')
        for a_dep in rob_deps:
            # if the string is empty, split(',') returns 1 item: ''
            # if the string is ",4", split(',') returns 2 items: '', '4'
            # long('') gives error, so check if the item is non-empty
            if a_dep:
                dep_record.rob_dep.append(long(a_dep))

        reg_deps = reg_dep_str.split(',')
        for a_dep in reg_deps:
            if a_dep:
                dep_record.reg_dep.append(long(a_dep))

        protolib.encodeMessage(proto_out, dep_record)
        num_records += 1

    print "Converted", num_records, "records."
    # We're done
    ascii_in.close()
    proto_out.close()

if __name__ == "__main__":
    main()