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#!/usr/bin/env python
#
# Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS. All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
"""This script is a tool to generate special header files from input
C source files.
It first assembles the input source files to generate intermediate assembly
files (*.s). Then it parses the .s files and finds declarations of variables
whose names start with the string specified as the third argument in the
command-line, translates the variable names and values into constant defines
and writes them into header files.
"""
import os
import re
import subprocess
import sys
from optparse import OptionParser
def main(argv):
parser = OptionParser()
usage = 'Usage: %prog [options] input_filename'
parser.set_usage(usage)
parser.add_option('--compiler', default = 'gcc', help = 'compiler name')
parser.add_option('--options', default = '-S', help = 'compiler options')
parser.add_option('--pattern', default = 'offset_', help = 'A match pattern'
' used for searching the relevant constants.')
parser.add_option('--dir', default = '.', help = 'output directory')
(options, args) = parser.parse_args()
# Generate complete intermediate and header file names.
input_filename = args[0]
output_root = (options.dir + '/' +
os.path.splitext(os.path.basename(input_filename))[0])
interim_filename = output_root + '.s'
out_filename = output_root + '.h'
# Set the shell command with the compiler and options inputs.
compiler_command = (options.compiler + " " + options.options + " " +
input_filename + " -o " + interim_filename)
# Run the shell command and generate the intermediate file.
subprocess.check_call(compiler_command, shell=True)
interim_file = open(interim_filename) # The intermediate file.
out_file = open(out_filename, 'w') # The output header file.
# Generate the output header file.
while True:
line = interim_file.readline()
if not line: break
if line.startswith(options.pattern):
# Find name of the next constant and write to the output file.
const_name = re.sub(r'^_', '', line.split(':')[0])
out_file.write('#define %s ' % const_name)
# Find value of the constant we just found and write to the output file.
line = interim_file.readline()
const_value = filter(str.isdigit, line.split(' ')[0])
if const_value != '':
out_file.write('%s\n' % const_value)
interim_file.close()
out_file.close()
if __name__ == "__main__":
main(sys.argv[1:])
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