#! /usr/bin/env python2
# -*- coding: utf-8 -*-

# Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above
#     copyright notice, this list of conditions and the following
#     disclaimer in the documentation and/or other materials provided
#     with the distribution.
#   * Neither the name of The Linux Foundation nor the names of its
#     contributors may be used to endorse or promote products derived
#     from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Invoke clang, look for static analyzer warnings, and cause a failure
# if there are non-whitelisted warnings.

import errno
import re
import os
import sys
import subprocess

allowed_warnings = set([
    "list.h:80",
 ])

# Capture the name of the object file, if can find it.
ofile = None

warning_re = re.compile(r'''(.*/|)([^/]+\.[a-z]+:\d+):(\d+:)? clang_sa_warning:''')
def interpret_warning(line):
    """Decode the message from clang.  The messages we care about have a filename, and a warning"""
    line = line.rstrip('\n')
    m = warning_re.match(line)
    if m and m.group(2) not in allowed_warnings:
        print "error, forbidden warning:", m.group(2)

        # If there is a warning, remove any object if it exists.
        if ofile:
            try:
                os.remove(ofile)
            except OSError:
                pass
        sys.exit(1)

def run_clang():
    args = sys.argv[1:]
    # Look for -o
    try:
        i = args.index('-o')
        global ofile
        ofile = args[i+1]
    except (ValueError, IndexError):
        pass

    compiler = sys.argv[0]

    try:
        proc = subprocess.Popen(args, stderr=subprocess.PIPE)
        for line in proc.stderr:
            print line,
            interpret_warning(line)

        result = proc.wait()
    except OSError as e:
        result = e.errno
        if result == errno.ENOENT:
            print args[0] + ':',e.strerror
            print 'Is your PATH set correctly?'
        else:
            print ' '.join(args), str(e)

    return result

if __name__ == '__main__':
    status = run_clang()
    sys.exit(status)