def build(self):
        # This code is only meant to be temporary until the more robust tree
        # building code in bug 780329 lands.
        from mozbuild.compilation.warnings import WarningsCollector
        from mozbuild.compilation.warnings import WarningsDatabase

        warnings_path = self._get_state_filename('warnings.json')
        warnings_database = WarningsDatabase()

        if os.path.exists(warnings_path):
            warnings_database.load_from_file(warnings_path)

        warnings_collector = WarningsCollector(database=warnings_database,
            objdir=self.topobjdir)

        def on_line(line):
            try:
                warning = warnings_collector.process_line(line)
                if warning:
                    self.log(logging.INFO, 'compiler_warning', warning,
                        'Warning: {flag} in {filename}: {message}')
            except:
                # This will get logged in the more robust implementation.
                pass

            self.log(logging.INFO, 'build_output', {'line': line}, '{line}')

        self._run_make(srcdir=True, filename='client.mk', line_handler=on_line,
            log=False, print_directory=False)

        self.log(logging.WARNING, 'warning_summary',
            {'count': len(warnings_collector.database)},
            '{count} compiler warnings present.')

        warnings_database.save_to_file(warnings_path)

    def database(self):
        from mozbuild.compilation.warnings import WarningsDatabase

        path = self.database_path

        database = WarningsDatabase()

        if os.path.exists(path):
            database.load_from_file(path)

        return database

    def test_basic(self):
        db = WarningsDatabase()

        self.assertEqual(len(db), 0)

        for i in range(10):
            db.insert(get_warning(), compute_hash=False)

        self.assertEqual(len(db), 10)

        warnings = list(db)
        self.assertEqual(len(warnings), 10)

    def test_pruning(self):
        """Ensure old warnings are removed from database appropriately."""
        db = WarningsDatabase()

        source_files = []
        for i in range(1, 21):
            temp = NamedTemporaryFile(mode='wt')
            temp.write('x' * (100 * i))
            temp.flush()

            # Keep reference so it doesn't get GC'd and deleted.
            source_files.append(temp)

            w = CompilerWarning()
            w['filename'] = temp.name
            w['line'] = 1
            w['column'] = i * 10
            w['message'] = 'irrelevant'

            db.insert(w)

        self.assertEqual(len(db), 20)

        # If we change a source file, inserting a new warning should nuke the
        # old one.
        source_files[0].write('extra')
        source_files[0].flush()

        w = CompilerWarning()
        w['filename'] = source_files[0].name
        w['line'] = 1
        w['column'] = 50
        w['message'] = 'replaced'

        db.insert(w)

        self.assertEqual(len(db), 20)

        warnings = list(db.warnings_for_file(source_files[0].name))
        self.assertEqual(len(warnings), 1)
        self.assertEqual(warnings[0]['column'], w['column'])

        # If we delete the source file, calling prune should cause the warnings
        # to go away.
        old_filename = source_files[0].name
        del source_files[0]

        self.assertFalse(os.path.exists(old_filename))

        db.prune()
        self.assertEqual(len(db), 19)

    def test_hashing(self):
        """Ensure that hashing files on insert works."""
        db = WarningsDatabase()

        temp = NamedTemporaryFile(mode='wt')
        temp.write('x' * 100)
        temp.flush()

        w = CompilerWarning()
        w['filename'] = temp.name
        w['line'] = 1
        w['column'] = 4
        w['message'] = 'foo bar'

        # Should not throw.
        db.insert(w)

        w['filename'] = 'DOES_NOT_EXIST'

        with self.assertRaises(Exception):
            db.insert(w)

    def build(self, what=None):
        # This code is only meant to be temporary until the more robust tree
        # building code in bug 780329 lands.
        from mozbuild.compilation.warnings import WarningsCollector
        from mozbuild.compilation.warnings import WarningsDatabase

        warnings_path = self._get_state_filename('warnings.json')
        warnings_database = WarningsDatabase()

        if os.path.exists(warnings_path):
            try:
                warnings_database.load_from_file(warnings_path)
            except ValueError:
                os.remove(warnings_path)

        warnings_collector = WarningsCollector(database=warnings_database,
            objdir=self.topobjdir)

        def on_line(line):
            try:
                warning = warnings_collector.process_line(line)
                if warning:
                    self.log(logging.INFO, 'compiler_warning', warning,
                        'Warning: {flag} in {filename}: {message}')
            except:
                # This will get logged in the more robust implementation.
                pass

            self.log(logging.INFO, 'build_output', {'line': line}, '{line}')

        def resolve_target_to_make(target):
            if os.path.isabs(target):
                print('Absolute paths for make targets are not allowed.')
                return (None, None)

            target = target.replace(os.sep, '/')

            abs_target = os.path.join(self.topobjdir, target)

            # For directories, run |make -C dir|. If the directory does not
            # contain a Makefile, check parents until we find one. At worst,
            # this will terminate at the root.
            if os.path.isdir(abs_target):
                current = abs_target

                while True:
                    make_path = os.path.join(current, 'Makefile')
                    if os.path.exists(make_path):
                        return (current[len(self.topobjdir) + 1:], None)

                    current = os.path.dirname(current)

            # If it's not in a directory, this is probably a top-level make
            # target. Treat it as such.
            if '/' not in target:
                return (None, target)

            # We have a relative path within the tree. We look for a Makefile
            # as far into the path as possible. Then, we compute the make
            # target as relative to that directory.
            reldir = os.path.dirname(target)
            target = os.path.basename(target)

            while True:
                make_path = os.path.join(self.topobjdir, reldir, 'Makefile')

                if os.path.exists(make_path):
                    return (reldir, target)

                target = os.path.join(os.path.basename(reldir), target)
                reldir = os.path.dirname(reldir)

        # End of resolve_target_to_make.

        if what:
            top_make = os.path.join(self.topobjdir, 'Makefile')
            if not os.path.exists(top_make):
                print('Your tree has not been configured yet. Please run '
                    '|mach build| with no arguments.')
                return 1

            for target in what:
                make_dir, make_target = resolve_target_to_make(target)

                if make_dir is None and make_target is None:
                    return 1

                status = self._run_make(directory=make_dir, target=make_target,
                    line_handler=on_line, log=False, print_directory=False,
                    ensure_exit_code=False)

                if status != 0:
                    break
        else:
            status = self._run_make(srcdir=True, filename='client.mk',
                line_handler=on_line, log=False, print_directory=False,
                allow_parallel=False, ensure_exit_code=False)

            self.log(logging.WARNING, 'warning_summary',
                {'count': len(warnings_collector.database)},
#.........这里部分代码省略.........

    def build(self, what=None):
        # This code is only meant to be temporary until the more robust tree
        # building code in bug 780329 lands.
        from mozbuild.compilation.warnings import WarningsCollector
        from mozbuild.compilation.warnings import WarningsDatabase
        from mozbuild.util import resolve_target_to_make

        warnings_path = self._get_state_filename('warnings.json')
        warnings_database = WarningsDatabase()

        if os.path.exists(warnings_path):
            try:
                warnings_database.load_from_file(warnings_path)
            except ValueError:
                os.remove(warnings_path)

        warnings_collector = WarningsCollector(database=warnings_database,
            objdir=self.topobjdir)

        def on_line(line):
            try:
                warning = warnings_collector.process_line(line)
                if warning:
                    self.log(logging.INFO, 'compiler_warning', warning,
                        'Warning: {flag} in {filename}: {message}')
            except:
                # This will get logged in the more robust implementation.
                pass

            self.log(logging.INFO, 'build_output', {'line': line}, '{line}')

        finder_start_cpu = self._get_finder_cpu_usage()
        time_start = time.time()

        if what:
            top_make = os.path.join(self.topobjdir, 'Makefile')
            if not os.path.exists(top_make):
                print('Your tree has not been configured yet. Please run '
                    '|mach build| with no arguments.')
                return 1

            for target in what:
                path_arg = self._wrap_path_argument(target)

                make_dir, make_target = resolve_target_to_make(self.topobjdir,
                    path_arg.relpath())

                if make_dir is None and make_target is None:
                    return 1

                status = self._run_make(directory=make_dir, target=make_target,
                    line_handler=on_line, log=False, print_directory=False,
                    ensure_exit_code=False)

                if status != 0:
                    break
        else:
            status = self._run_make(srcdir=True, filename='client.mk',
                line_handler=on_line, log=False, print_directory=False,
                allow_parallel=False, ensure_exit_code=False)

            self.log(logging.WARNING, 'warning_summary',
                {'count': len(warnings_collector.database)},
                '{count} compiler warnings present.')

        warnings_database.prune()
        warnings_database.save_to_file(warnings_path)

        time_end = time.time()
        self._handle_finder_cpu_usage(time_end - time_start, finder_start_cpu)

        print('Finished building. Built files are in %s' % self.topobjdir)

        return status