encode_packet_trace.py revision 9706:fbb19814adbc 
1#!/usr/bin/env python
2
3# Copyright (c) 2013 ARM Limited
4# All rights reserved
5#
6# The license below extends only to copyright in the software and shall
7# not be construed as granting a license to any other intellectual
8# property including but not limited to intellectual property relating
9# to a hardware implementation of the functionality of the software
10# licensed hereunder.  You may use the software subject to the license
11# terms below provided that you ensure that this notice is replicated
12# unmodified and in its entirety in all distributions of the software,
13# modified or unmodified, in source code or in binary form.
14#
15# Redistribution and use in source and binary forms, with or without
16# modification, are permitted provided that the following conditions are
17# met: redistributions of source code must retain the above copyright
18# notice, this list of conditions and the following disclaimer;
19# redistributions in binary form must reproduce the above copyright
20# notice, this list of conditions and the following disclaimer in the
21# documentation and/or other materials provided with the distribution;
22# neither the name of the copyright holders nor the names of its
23# contributors may be used to endorse or promote products derived from
24# this software without specific prior written permission.
25#
26# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
27# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
29# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
30# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37#
38# Copyright 2008 Google Inc.  All rights reserved.
39# http://code.google.com/p/protobuf/
40#
41# Redistribution and use in source and binary forms, with or without
42# modification, are permitted provided that the following conditions are
43# met:
44#
45#     * Redistributions of source code must retain the above copyright
46# notice, this list of conditions and the following disclaimer.
47#     * Redistributions in binary form must reproduce the above
48# copyright notice, this list of conditions and the following disclaimer
49# in the documentation and/or other materials provided with the
50# distribution.
51#     * Neither the name of Google Inc. nor the names of its
52# contributors may be used to endorse or promote products derived from
53# this software without specific prior written permission.
54#
55# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
56# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
57# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
58# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
59# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
60# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
61# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
62# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
63# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
64# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
65# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
66#
67# Authors: Andreas Hansson
68#
69
70# This script is used to migrate ASCII packet traces to the protobuf
71# format currently used in gem5. It assumes that protoc has been
72# executed and already generated the Python package for the packet
73# messages. This can be done manually using:
74# protoc --python_out=. --proto_path=src/proto src/proto/packet.proto
75#
76# The ASCII trace format uses one line per request on the format cmd,
77# addr, size, tick. For example:
78# r,128,64,4000
79# w,232123,64,500000
80# This trace reads 64 bytes from decimal address 128 at tick 4000,
81# then writes 64 bytes to address 232123 at tick 500000.
82#
83# This script can of course also be used as a template to convert
84# other trace formats into the gem5 protobuf format
85
86import struct
87import sys
88
89# Import the packet proto definitions. If they are not found, attempt
90# to generate them automatically. This assumes that the script is
91# executed from the gem5 root.
92try:
93    import packet_pb2
94except:
95    print "Did not find packet proto definitions, attempting to generate"
96    from subprocess import call
97    error = call(['protoc', '--python_out=util', '--proto_path=src/proto',
98                  'src/proto/packet.proto'])
99    if not error:
100        import packet_pb2
101        print "Generated packet proto definitions"
102    else:
103        print "Failed to import packet proto definitions"
104        exit(-1)
105
106def EncodeVarint(out_file, value):
107  """
108  The encoding of the Varint32 is copied from
109  google.protobuf.internal.encoder and is only repeated here to
110  avoid depending on the internal functions in the library.
111  """
112  bits = value & 0x7f
113  value >>= 7
114  while value:
115    out_file.write(struct.pack('<B', 0x80|bits))
116    bits = value & 0x7f
117    value >>= 7
118  out_file.write(struct.pack('<B', bits))
119
120def encodeMessage(out_file, message):
121    """
122    Encoded a message with the length prepended as a 32-bit varint.
123    """
124    out = message.SerializeToString()
125    EncodeVarint(out_file, len(out))
126    out_file.write(out)
127
128def main():
129    if len(sys.argv) != 3:
130        print "Usage: ", sys.argv[0], " <ASCII input> <protobuf output>"
131        exit(-1)
132
133    try:
134        ascii_in = open(sys.argv[1], 'r')
135    except IOError:
136        print "Failed to open ", sys.argv[1], " for reading"
137        exit(-1)
138
139    try:
140        proto_out = open(sys.argv[2], 'wb')
141    except IOError:
142        print "Failed to open ", sys.argv[2], " for writing"
143        exit(-1)
144
145    # Write the magic number in 4-byte Little Endian, similar to what
146    # is done in src/proto/protoio.cc
147    proto_out.write("gem5")
148
149    # Add the packet header
150    header = packet_pb2.PacketHeader()
151    header.obj_id = "Converted ASCII trace " + sys.argv[1]
152    # Assume the default tick rate
153    header.tick_freq = 1000000000
154    encodeMessage(proto_out, header)
155
156    # For each line in the ASCII trace, create a packet message and
157    # write it to the encoded output
158    for line in ascii_in:
159        cmd, addr, size, tick = line.split(',')
160        packet = packet_pb2.Packet()
161        packet.tick = long(tick)
162        # ReadReq is 1 and WriteReq is 4 in src/mem/packet.hh Command enum
163        packet.cmd = 1 if cmd == 'r' else 4
164        packet.addr = long(addr)
165        packet.size = int(size)
166        encodeMessage(proto_out, packet)
167
168    # We're done
169    ascii_in.close()
170    proto_out.close()
171
172if __name__ == "__main__":
173    main()
174