test/lit.cfg

# -*- Python -*- vim: set syntax=python tabstop=4 expandtab cc=80:

# Configuration file for the 'lit' test runner.

import errno
import locale
import os
import platform
import re
import shlex
import signal
import subprocess
import sys
import tempfile
import time

import lit.Test
import lit.formats
import lit.util

class LibcxxTestFormat(lit.formats.FileBasedTest):
    """
    Custom test format handler for use with the test format use by libc++.

    Tests fall into two categories:
      FOO.pass.cpp - Executable test which should compile, run, and exit with
                     code 0.
      FOO.fail.cpp - Negative test case which is expected to fail compilation.
    """

    def __init__(self, cxx_under_test, cpp_flags, ld_flags, exec_env):
        self.cxx_under_test = cxx_under_test
        self.cpp_flags = list(cpp_flags)
        self.ld_flags = list(ld_flags)
        self.exec_env = dict(exec_env)

    def execute_command(self, command, in_dir=None):
        kwargs = {
            'stdin' :subprocess.PIPE,
            'stdout':subprocess.PIPE,
            'stderr':subprocess.PIPE,
        }
        if in_dir:
            kwargs['cwd'] = in_dir
        p = subprocess.Popen(command, **kwargs)
        out,err = p.communicate()
        exitCode = p.wait()

        # Detect Ctrl-C in subprocess.
        if exitCode == -signal.SIGINT:
            raise KeyboardInterrupt

        return out, err, exitCode

    def execute(self, test, lit_config):
        while True:
            try:
                return self._execute(test, lit_config)
            except OSError, oe:
                if oe.errno != errno.ETXTBSY:
                    raise
                time.sleep(0.1)

    def _execute(self, test, lit_config):
        # Extract test metadata from the test file.
        requires = []
        unsupported = []
        with open(test.getSourcePath()) as f:
            for ln in f:
                if 'XFAIL:' in ln:
                    items = ln[ln.index('XFAIL:') + 6:].split(',')
                    test.xfails.extend([s.strip() for s in items])
                elif 'REQUIRES:' in ln:
                    items = ln[ln.index('REQUIRES:') + 9:].split(',')
                    requires.extend([s.strip() for s in items])
                elif 'UNSUPPORTED:' in ln:
                    items = ln[ln.index('UNSUPPORTED:') + 12:].split(',')
                    unsupported.extend([s.strip() for s in items])
                elif not ln.strip().startswith("//") and ln.strip():
                    # Stop at the first non-empty line that is not a C++
                    # comment.
                    break

        # Check that we have the required features.
        #
        # FIXME: For now, this is cribbed from lit.TestRunner, to avoid
        # introducing a dependency there. What we more ideally would like to do
        # is lift the "requires" handling to be a core lit framework feature.
        missing_required_features = [f for f in requires
                                     if f not in test.config.available_features]
        if missing_required_features:
            return (lit.Test.UNSUPPORTED,
                    "Test requires the following features: %s" % (
                      ', '.join(missing_required_features),))

        unsupported_features = [f for f in unsupported
                             if f in test.config.available_features]
        if unsupported_features:
            return (lit.Test.UNSUPPORTED,
                    "Test is unsupported with the following features: %s" % (
                       ', '.join(unsupported_features),))

        # Evaluate the test.
        return self._evaluate_test(test, lit_config)

    def _evaluate_test(self, test, lit_config):
        name = test.path_in_suite[-1]
        source_path = test.getSourcePath()
        source_dir = os.path.dirname(source_path)

        # Check what kind of test this is.
        assert name.endswith('.pass.cpp') or name.endswith('.fail.cpp')
        expected_compile_fail = name.endswith('.fail.cpp')

        # If this is a compile (failure) test, build it and check for failure.
        if expected_compile_fail:
            cmd = [self.cxx_under_test, '-c',
                   '-o', '/dev/null', source_path] + self.cpp_flags
            out, err, exitCode = self.execute_command(cmd)
            if exitCode == 1:
                return lit.Test.PASS, ""
            else:
                report = """Command: %s\n""" % ' '.join(["'%s'" % a
                                                         for a in cmd])
                report += """Exit Code: %d\n""" % exitCode
                if out:
                    report += """Standard Output:\n--\n%s--""" % out
                if err:
                    report += """Standard Error:\n--\n%s--""" % err
                report += "\n\nExpected compilation to fail!"
                return lit.Test.FAIL, report
        else:
            exec_file = tempfile.NamedTemporaryFile(suffix="exe", delete=False)
            exec_path = exec_file.name
            exec_file.close()

            try:
                compile_cmd = [self.cxx_under_test, '-o', exec_path,
                       source_path] + self.cpp_flags + self.ld_flags
                cmd = compile_cmd
                out, err, exitCode = self.execute_command(cmd)
                if exitCode != 0:
                    report = """Command: %s\n""" % ' '.join(["'%s'" % a
                                                             for a in cmd])
                    report += """Exit Code: %d\n""" % exitCode
                    if out:
                        report += """Standard Output:\n--\n%s--""" % out
                    if err:
                        report += """Standard Error:\n--\n%s--""" % err
                    report += "\n\nCompilation failed unexpectedly!"
                    return lit.Test.FAIL, report

                cmd = []
                if self.exec_env:
                    cmd.append('env')
                    cmd.extend('%s=%s' % (name, value)
                               for name,value in self.exec_env.items())
                cmd.append(exec_path)
                if lit_config.useValgrind:
                    cmd = lit_config.valgrindArgs + cmd
                out, err, exitCode = self.execute_command(cmd, source_dir)
                if exitCode != 0:
                    report = """Compiled With: %s\n""" % \
                        ' '.join(["'%s'" % a for a in compile_cmd])
                    report += """Command: %s\n""" % \
                        ' '.join(["'%s'" % a for a in cmd])
                    report += """Exit Code: %d\n""" % exitCode
                    if out:
                        report += """Standard Output:\n--\n%s--""" % out
                    if err:
                        report += """Standard Error:\n--\n%s--""" % err
                    report += "\n\nCompiled test failed unexpectedly!"
                    return lit.Test.FAIL, report
            finally:
                try:
                    os.remove(exec_path)
                except:
                    pass
        return lit.Test.PASS, ""


class Configuration(object):
    def __init__(self, lit_config, config):
        self.lit_config = lit_config
        self.config = config
        self.cxx = None
        self.src_root = None
        self.obj_root = None
        self.env = {}
        self.compile_flags = []
        self.link_flags = []
        self.use_system_lib = False

        if platform.system() not in ('Darwin', 'FreeBSD', 'Linux'):
            self.lit_config.fatal("unrecognized system")

    def get_lit_conf(self, name, default=None):
        val = self.lit_config.params.get(name, None)
        if val is None:
            val = getattr(self.config, name, None)
            if val is None:
                val = default
        return val

    def configure(self):
        self.configure_cxx()
        self.configure_triple()
        self.configure_src_root()
        self.configure_obj_root()
        self.configure_use_system_lib()
        self.configure_env()
        self.configure_std_flag()
        self.configure_compile_flags()
        self.configure_link_flags()
        self.configure_sanitizer()
        self.configure_features()

    def get_test_format(self):
        return LibcxxTestFormat(
            self.cxx,
            cpp_flags=['-nostdinc++'] + self.compile_flags,
            ld_flags=['-nodefaultlibs'] + self.link_flags,
            exec_env=self.env)

    def configure_cxx(self):
        # Gather various compiler parameters.
        self.cxx = self.get_lit_conf('cxx_under_test')

        # If no specific cxx_under_test was given, attempt to infer it as
        # clang++.
        if self.cxx is None:
            clangxx = lit.util.which('clang++',
                                     self.config.environment['PATH'])
            if clangxx:
                self.cxx = clangxx
                self.lit_config.note(
                    "inferred cxx_under_test as: %r" % self.cxx)
        if not self.cxx:
            self.lit_config.fatal('must specify user parameter cxx_under_test '
                                  '(e.g., --param=cxx_under_test=clang++)')

    def configure_src_root(self):
        self.src_root = self.get_lit_conf(
            'libcxx_src_root', os.path.dirname(self.config.test_source_root))

    def configure_obj_root(self):
        self.obj_root = self.get_lit_conf('libcxx_obj_root', self.src_root)

    def configure_use_system_lib(self):
        # This test suite supports testing against either the system library or
        # the locally built one; the former mode is useful for testing ABI
        # compatibility between the current headers and a shipping dynamic
        # library.
        use_system_lib_str = self.get_lit_conf('use_system_lib')
        if use_system_lib_str:
            if use_system_lib_str.lower() in ('1', 'true'):
                self.use_system_lib = True
            elif use_system_lib_str.lower() in ('', '0', 'false'):
                self.use_system_lib = False
            else:
                self.lit_config.fatal(
                    'user parameter use_system_lib should be 0 or 1')
        else:
            # Default to testing against the locally built libc++ library.
            self.use_system_lib = False
            self.lit_config.note(
                "inferred use_system_lib as: %r" % self.use_system_lib)

    def configure_features(self):
        # Figure out which of the required locales we support
        locales = {
            'Darwin': {
                'en_US.UTF-8': 'en_US.UTF-8',
                'cs_CZ.ISO8859-2': 'cs_CZ.ISO8859-2',
                'fr_FR.UTF-8': 'fr_FR.UTF-8',
                'fr_CA.ISO8859-1': 'cs_CZ.ISO8859-1',
                'ru_RU.UTF-8': 'ru_RU.UTF-8',
                'zh_CN.UTF-8': 'zh_CN.UTF-8',
            },
            'FreeBSD': {
                'en_US.UTF-8': 'en_US.UTF-8',
                'cs_CZ.ISO8859-2': 'cs_CZ.ISO8859-2',
                'fr_FR.UTF-8': 'fr_FR.UTF-8',
                'fr_CA.ISO8859-1': 'fr_CA.ISO8859-1',
                'ru_RU.UTF-8': 'ru_RU.UTF-8',
                'zh_CN.UTF-8': 'zh_CN.UTF-8',
            },
            'Linux': {
                'en_US.UTF-8': 'en_US.UTF-8',
                'cs_CZ.ISO8859-2': 'cs_CZ.ISO-8859-2',
                'fr_FR.UTF-8': 'fr_FR.UTF-8',
                'fr_CA.ISO8859-1': 'fr_CA.ISO-8859-1',
                'ru_RU.UTF-8': 'ru_RU.UTF-8',
                'zh_CN.UTF-8': 'zh_CN.UTF-8',
            },
            'Windows': {
                'en_US.UTF-8': 'English_United States.1252',
                'cs_CZ.ISO8859-2': 'Czech_Czech Republic.1250',
                'fr_FR.UTF-8': 'French_France.1252',
                'fr_CA.ISO8859-1': 'French_Canada.1252',
                'ru_RU.UTF-8': 'Russian_Russia.1251',
                'zh_CN.UTF-8': 'Chinese_China.936',
            },
        }

        default_locale = locale.setlocale(locale.LC_ALL)
        for feature, loc in locales[platform.system()].items():
            try:
                locale.setlocale(locale.LC_ALL, loc)
                self.config.available_features.add('locale.{}'.format(feature))
            except:
                self.lit_config.warning('The locale {} is not supported by '
                                        'your platform. Some tests will be '
                                        'unsupported.'.format(loc))
        locale.setlocale(locale.LC_ALL, default_locale)

        # Write an "available feature" that combines the triple when
        # use_system_lib is enabled. This is so that we can easily write XFAIL
        # markers for tests that are known to fail with versions of libc++ as
        # were shipped with a particular triple.
        if self.use_system_lib:
            # Drop sub-major version components from the triple, because the
            # current XFAIL handling expects exact matches for feature checks.
            sanitized_triple = re.sub(
                r"([^-]+)-([^-]+)-([^-.]+).*", r"\1-\2-\3",
                self.config.target_triple)
            self.config.available_features.add(
                'with_system_lib=%s' % sanitized_triple)

    def configure_compile_flags(self):
        # Configure extra compiler flags.
        self.compile_flags += ['-I' + self.src_root + '/include',
                               '-I' + self.src_root + '/test/support']

    def configure_link_flags(self):
        self.link_flags += ['-L' + self.obj_root + '/lib', '-lc++']
        link_flags_str = self.get_lit_conf('link_flags')
        if link_flags_str is None:
            cxx_abi = self.get_lit_conf('cxx_abi', 'libcxxabi')
            if cxx_abi == 'libstdc++':
                self.link_flags += ['-lstdc++']
            elif cxx_abi == 'libsupc++':
                self.link_flags += ['-lsupc++']
            elif cxx_abi == 'libcxxabi':
                self.link_flags += ['-lc++abi']
            elif cxx_abi == 'libcxxrt':
                self.link_flags += ['-lcxxrt']
            elif cxx_abi == 'none':
                pass
            else:
                self.lit_config.fatal(
                    'C++ ABI setting %s unsupported for tests' % cxx_abi)

            if sys.platform == 'darwin':
                self.link_flags += ['-lSystem']
            elif sys.platform == 'linux2':
                self.link_flags += ['-lgcc_eh', '-lc', '-lm', '-lpthread',
                                    '-lrt', '-lgcc_s']
            elif sys.platform.startswith('freebsd'):
                self.link_flags += ['-lc', '-lm', '-pthread', '-lgcc_s']
            else:
                self.lit_config.fatal("unrecognized system")

            self.lit_config.note(
                "inferred link_flags as: %r" % self.link_flags)
        if link_flags_str:
            self.link_flags += shlex.split(link_flags_str)

        if sys.platform == 'linux2':
            if not self.use_system_lib:
                self.link_flags += ['-Wl,-R', self.obj_root + '/lib']
            self.compile_flags += ['-D__STDC_FORMAT_MACROS',
                                   '-D__STDC_LIMIT_MACROS',
                                   '-D__STDC_CONSTANT_MACROS']
        elif sys.platform.startswith('freebsd'):
            if not self.use_system_lib:
                self.link_flags += ['-Wl,-R', self.obj_root + '/lib']

    def configure_std_flag(self):
        # Try and get the std version from the command line. Fall back to
        # default given in lit.site.cfg is not present. If default is not
        # present then force c++11.
        std = self.get_lit_conf('std')
        if std is None:
            std = 'c++11'
            self.lit_config.note('using default std: \'-std=c++11\'')
        self.compile_flags += ['-std={}'.format(std)]
        self.config.available_features.add(std)

    def configure_sanitizer(self):
        san = self.get_lit_conf('llvm_use_sanitizer', '').strip()
        if san:
            self.compile_flags += ['-fno-omit-frame-pointer']
            if san == 'Address':
                self.compile_flags += ['-fsanitize=address']
                self.config.available_features.add('asan')
            elif san == 'Memory' or san == 'MemoryWithOrigins':
                self.compile_flags += ['-fsanitize=memory']
                if san == 'MemoryWithOrigins':
                    self.compile_flags += ['-fsanitize-memory-track-origins']
                self.config.available_features.add('msan')
            else:
                self.lit_config.fatal('unsupported value for '
                                      'libcxx_use_san: {}'.format(san))

    def configure_triple(self):
        # Get or infer the target triple.
        self.config.target_triple = self.get_lit_conf('target_triple')
        # If no target triple was given, try to infer it from the compiler
        # under test.
        if not self.config.target_triple:
            self.config.target_triple = lit.util.capture(
                [self.cxx, '-dumpmachine']).strip()
            self.lit_config.note(
                "inferred target_triple as: %r" % self.config.target_triple)

    def configure_env(self):
        # Configure extra linker parameters.
        if sys.platform == 'darwin':
            if not self.use_system_lib:
                self.env['DYLD_LIBRARY_PATH'] = os.path.join(self.obj_root,
                                                             'lib')


# name: The name of this test suite.
config.name = 'libc++'

# suffixes: A list of file extensions to treat as test files.
config.suffixes = ['.cpp']

# test_source_root: The root path where tests are located.
config.test_source_root = os.path.dirname(__file__)

configuration = Configuration(lit_config, config)
configuration.configure()
config.test_format = configuration.get_test_format()