2f9bd247ad
Bugs=none Test=trybots, and offline file bit-exact tests. Review URL: https://webrtc-codereview.appspot.com/1066009 git-svn-id: http://webrtc.googlecode.com/svn/trunk@3563 4adac7df-926f-26a2-2b94-8c16560cd09d
75 lines
2.8 KiB
Python
75 lines
2.8 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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#
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# Use of this source code is governed by a BSD-style license
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# that can be found in the LICENSE file in the root of the source
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# tree. An additional intellectual property rights grant can be found
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# in the file PATENTS. All contributing project authors may
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# be found in the AUTHORS file in the root of the source tree.
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"""This script is a tool to generate special header files from input
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C source files.
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It first assembles the input source files to generate intermediate assembly
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files (*.s). Then it parses the .s files and finds declarations of variables
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whose names start with the string specified as the third argument in the
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command-line, translates the variable names and values into constant defines
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and writes them into header files.
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"""
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import os
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import re
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import subprocess
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import sys
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from optparse import OptionParser
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def main(argv):
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parser = OptionParser()
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usage = 'Usage: %prog [options] input_filename'
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parser.set_usage(usage)
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parser.add_option('--compiler', default = 'gcc', help = 'compiler name')
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parser.add_option('--options', default = '-S', help = 'compiler options')
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parser.add_option('--pattern', default = 'offset_', help = 'A match pattern'
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' used for searching the relevant constants.')
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parser.add_option('--dir', default = '.', help = 'output directory')
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(options, args) = parser.parse_args()
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# Generate complete intermediate and header file names.
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input_filename = args[0]
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output_root = (options.dir + '/' +
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os.path.splitext(os.path.basename(input_filename))[0])
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interim_filename = output_root + '.s'
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out_filename = output_root + '.h'
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# Set the shell command with the compiler and options inputs.
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compiler_command = (options.compiler + " " + options.options + " " +
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input_filename + " -o " + interim_filename)
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# Run the shell command and generate the intermediate file.
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subprocess.check_call(compiler_command, shell=True)
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interim_file = open(interim_filename) # The intermediate file.
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out_file = open(out_filename, 'w') # The output header file.
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# Generate the output header file.
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while True:
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line = interim_file.readline()
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if not line: break
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if line.startswith(options.pattern):
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# Find name of the next constant and write to the output file.
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const_name = re.sub(r'^_', '', line.split(':')[0])
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out_file.write('#define %s ' % const_name)
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# Find value of the constant we just found and write to the output file.
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line = interim_file.readline()
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const_value = filter(str.isdigit, line.split(' ')[0])
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if const_value != '':
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out_file.write('%s\n' % const_value)
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interim_file.close()
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out_file.close()
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if __name__ == "__main__":
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main(sys.argv[1:])
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