1# Copyright 2014 The Chromium Authors. All rights reserved. 2# Use of this source code is governed by a BSD-style license that can be 3# found in the LICENSE file. 4 5"""A wrapper to run yasm. 6 7Its main job is to provide a Python wrapper for GN integration, and to write 8the makefile-style output yasm generates in stdout to a .d file for dependency 9management of .inc files. 10 11Run with: 12 python run_yasm.py <yasm_binary_path> <all other yasm args> 13 14Note that <all other yasm args> must include an explicit output file (-o). This 15script will append a ".d" to this and write the dependencies there. This script 16will add "-M" to cause yasm to write the deps to stdout, so you don't need to 17specify that. 18""" 19 20import argparse 21import sys 22import subprocess 23 24# Extract the output file name from the yasm command line so we can generate a 25# .d file with the same base name. 26parser = argparse.ArgumentParser() 27parser.add_argument("-o", dest="objfile") 28options, _ = parser.parse_known_args() 29 30objfile = options.objfile 31depfile = objfile + '.d' 32 33# Assemble. 34result_code = subprocess.call(sys.argv[1:]) 35if result_code != 0: 36 sys.exit(result_code) 37 38# Now generate the .d file listing the dependencies. The -M option makes yasm 39# write the Makefile-style dependencies to stdout, but it seems that inhibits 40# generating any compiled output so we need to do this in a separate pass. 41# However, outputting deps seems faster than actually assembling, and yasm is 42# so fast anyway this is not a big deal. 43# 44# This guarantees proper dependency management for assembly files. Otherwise, 45# we would have to require people to manually specify the .inc files they 46# depend on in the build file, which will surely be wrong or out-of-date in 47# some cases. 48deps = subprocess.check_output(sys.argv[1:] + ['-M']) 49with open(depfile, "wb") as f: 50 f.write(deps) 51 52