preprocess.py - mozsearch

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# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-

# vim: set filetype=python:

# This Source Code Form is subject to the terms of the Mozilla Public

# License, v. 2.0. If a copy of the MPL was not distributed with this

# file, You can obtain one at http://mozilla.org/MPL/2.0/.

import errno

import os

import shlex

import subprocess

import sys

import tempfile

import buildconfig

from mozfile import which

def preprocess(out, asm_file):

    cxx = shlex.split(buildconfig.substs["CXX"])

    if not os.path.exists(cxx[0]):

        tool = cxx[0]

        cxx[0] = which(tool)

        if not cxx[0]:

            raise OSError(errno.ENOENT, "Could not find {} on PATH.".format(tool))

    cppflags = buildconfig.substs["OS_CPPFLAGS"]

    # subprocess.Popen(stdout=) only accepts actual file objects, which `out`,

    # above, is not.  So fake a temporary file to write to.

    (outhandle, tmpout) = tempfile.mkstemp(suffix=".cpp")

    # #line directives will confuse armasm64, and /EP is the only way to

    # preprocess without emitting #line directives.

    command = cxx + ["/EP"] + cppflags + ["/TP", asm_file]

    with open(tmpout, "wb") as t:

        result = subprocess.Popen(command, stdout=t).wait()

        if result != 0:

            sys.exit(result)

    with open(tmpout, "rb") as t:

        out.write(t.read())

    os.close(outhandle)

    os.remove(tmpout)