test/dotest.py

#!/usr/bin/env python

"""
A simple testing framework for lldb using python's unit testing framework.

Tests for lldb are written as python scripts which take advantage of the script
bridging provided by LLDB.framework to interact with lldb core.

A specific naming pattern is followed by the .py script to be recognized as
a module which implements a test scenario, namely, Test*.py.

To specify the directories where "Test*.py" python test scripts are located,
you need to pass in a list of directory names.  By default, the current
working directory is searched if nothing is specified on the command line.

Type:

./dotest.py -h

for available options.
"""

import os
import platform
import signal
import subprocess
import sys
import textwrap
import time
import unittest2
import progress

if sys.version_info >= (2, 7):
    argparse = __import__('argparse')
else:
    argparse = __import__('argparse_compat')

def is_exe(fpath):
    """Returns true if fpath is an executable."""
    return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

def which(program):
    """Returns the full path to a program; None otherwise."""
    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file
    return None

class _WritelnDecorator(object):
    """Used to decorate file-like objects with a handy 'writeln' method"""
    def __init__(self,stream):
        self.stream = stream

    def __getattr__(self, attr):
        if attr in ('stream', '__getstate__'):
            raise AttributeError(attr)
        return getattr(self.stream,attr)

    def writeln(self, arg=None):
        if arg:
            self.write(arg)
        self.write('\n') # text-mode streams translate to \r\n if needed

#
# Global variables:
#

# Dictionary of categories
# When you define a new category for your testcases, be sure to add it here, or the test suite
# will gladly complain as soon as you try to use it. This allows us to centralize which categories
# exist, and to provide a description for each one
validCategories = {
'dataformatters':'Tests related to the type command and the data formatters subsystem',
'expression':'Tests related to the expression parser',
'objc':'Tests related to the Objective-C programming language support',
'pyapi':'Tests related to the Python API',
'basic_process': 'Basic process execution sniff tests.',
'cmdline' : 'Tests related to the LLDB command-line interface'
}

# The test suite.
suite = unittest2.TestSuite()

# By default, both command line and Python API tests are performed.
# Use @python_api_test decorator, defined in lldbtest.py, to mark a test as
# a Python API test.
dont_do_python_api_test = False

# By default, both command line and Python API tests are performed.
just_do_python_api_test = False

# By default, benchmarks tests are not run.
just_do_benchmarks_test = False

# By default, both dsym and dwarf tests are performed.
# Use @dsym_test or @dwarf_test decorators, defined in lldbtest.py, to mark a test
# as a dsym or dwarf test.  Use '-N dsym' or '-N dwarf' to exclude dsym or dwarf
# tests from running.
dont_do_dsym_test = "linux" in sys.platform or "freebsd" in sys.platform
dont_do_dwarf_test = False

# The blacklist is optional (-b blacklistFile) and allows a central place to skip
# testclass's and/or testclass.testmethod's.
blacklist = None

# The dictionary as a result of sourcing blacklistFile.
blacklistConfig = {}

# The list of categories we said we care about
categoriesList = None
# set to true if we are going to use categories for cherry-picking test cases
useCategories = False
# use this to track per-category failures
failuresPerCategory = {}

# The path to LLDB.framework is optional.
lldbFrameworkPath = None

# The path to lldb is optional
lldbExecutablePath = None

# The config file is optional.
configFile = None

# Test suite repeat count.  Can be overwritten with '-# count'.
count = 1

# The dictionary as a result of sourcing configFile.
config = {}
# The pre_flight and post_flight functions come from reading a config file.
pre_flight = None
post_flight = None

# The 'archs' and 'compilers' can be specified via either command line or configFile,
# with the command line overriding the configFile.  The corresponding options can be
# specified more than once. For example, "-A x86_64 -A i386" => archs=['x86_64', 'i386']
# and "-C gcc -C clang" => compilers=['gcc', 'clang'].
archs = None        # Must be initialized after option parsing
compilers = None    # Must be initialized after option parsing

# The arch might dictate some specific CFLAGS to be passed to the toolchain to build
# the inferior programs.  The global variable cflags_extras provides a hook to do
# just that.
cflags_extras = ''

# Delay startup in order for the debugger to attach.
delay = False

# Dump the Python sys.path variable.  Use '-D' to dump sys.path.
dumpSysPath = False

# Full path of the benchmark executable, as specified by the '-e' option.
bmExecutable = None
# The breakpoint specification of bmExecutable, as specified by the '-x' option.
bmBreakpointSpec = None
# The benchamrk iteration count, as specified by the '-y' option.
bmIterationCount = -1

# By default, don't exclude any directories.  Use '-X' to add one excluded directory.
excluded = set(['.svn', '.git'])

# By default, failfast is False.  Use '-F' to overwrite it.
failfast = False

# The filters (testclass.testmethod) used to admit tests into our test suite.
filters = []

# The runhooks is a list of lldb commands specifically for the debugger.
# Use '-k' to specify a runhook.
runHooks = []

# If '-g' is specified, the filterspec is not exclusive.  If a test module does
# not contain testclass.testmethod which matches the filterspec, the whole test
# module is still admitted into our test suite.  fs4all flag defaults to True.
fs4all = True

# Ignore the build search path relative to this script to locate the lldb.py module.
ignore = False

# By default, we do not skip build and cleanup.  Use '-S' option to override.
skip_build_and_cleanup = False

# By default, we skip long running test case.  Use '-l' option to override.
skip_long_running_test = True

# By default, we print the build dir, lldb version, and svn info.  Use '-n' option to
# turn it off.
noHeaders = False

# Parsable mode silences headers, and any other output this script might generate, and instead
# prints machine-readable output similar to what clang tests produce.
parsable = False

# The regular expression pattern to match against eligible filenames as our test cases.
regexp = None

# By default, tests are executed in place and cleanups are performed afterwards.
# Use '-r dir' option to relocate the tests and their intermediate files to a
# different directory and to forgo any cleanups.  The directory specified must
# not exist yet.
rdir = None

# By default, recorded session info for errored/failed test are dumped into its
# own file under a session directory named after the timestamp of the test suite
# run.  Use '-s session-dir-name' to specify a specific dir name.
sdir_name = None

# Set this flag if there is any session info dumped during the test run.
sdir_has_content = False

# svn_info stores the output from 'svn info lldb.base.dir'.
svn_info = ''

# svn_silent means do not try to obtain svn status
svn_silent = True

# Default verbosity is 0.
verbose = 1

# Set to True only if verbose is 0 and LLDB trace mode is off.
progress_bar = False

# By default, search from the script directory.
testdirs = [ sys.path[0] ]

# Separator string.
separator = '-' * 70

failed = False

def usage(parser):
    parser.print_help()
    if verbose > 0:
        print """
Examples:

This is an example of using the -f option to pinpoint to a specfic test class
and test method to be run:

$ ./dotest.py -f ClassTypesTestCase.test_with_dsym_and_run_command
----------------------------------------------------------------------
Collected 1 test

test_with_dsym_and_run_command (TestClassTypes.ClassTypesTestCase)
Test 'frame variable this' when stopped on a class constructor. ... ok

----------------------------------------------------------------------
Ran 1 test in 1.396s

OK

And this is an example of using the -p option to run a single file (the filename
matches the pattern 'ObjC' and it happens to be 'TestObjCMethods.py'):

$ ./dotest.py -v -p ObjC
----------------------------------------------------------------------
Collected 4 tests

test_break_with_dsym (TestObjCMethods.FoundationTestCase)
Test setting objc breakpoints using '_regexp-break' and 'breakpoint set'. ... ok
test_break_with_dwarf (TestObjCMethods.FoundationTestCase)
Test setting objc breakpoints using '_regexp-break' and 'breakpoint set'. ... ok
test_data_type_and_expr_with_dsym (TestObjCMethods.FoundationTestCase)
Lookup objective-c data types and evaluate expressions. ... ok
test_data_type_and_expr_with_dwarf (TestObjCMethods.FoundationTestCase)
Lookup objective-c data types and evaluate expressions. ... ok

----------------------------------------------------------------------
Ran 4 tests in 16.661s

OK

Running of this script also sets up the LLDB_TEST environment variable so that
individual test cases can locate their supporting files correctly.  The script
tries to set up Python's search paths for modules by looking at the build tree
relative to this script.  See also the '-i' option in the following example.

Finally, this is an example of using the lldb.py module distributed/installed by
Xcode4 to run against the tests under the 'forward' directory, and with the '-w'
option to add some delay between two tests.  It uses ARCH=x86_64 to specify that
as the architecture and CC=clang to specify the compiler used for the test run:

$ PYTHONPATH=/Xcode4/Library/PrivateFrameworks/LLDB.framework/Versions/A/Resources/Python ARCH=x86_64 CC=clang ./dotest.py -v -w -i forward

Session logs for test failures/errors will go into directory '2010-11-11-13_56_16'
----------------------------------------------------------------------
Collected 2 tests

test_with_dsym_and_run_command (TestForwardDeclaration.ForwardDeclarationTestCase)
Display *bar_ptr when stopped on a function with forward declaration of struct bar. ... ok
test_with_dwarf_and_run_command (TestForwardDeclaration.ForwardDeclarationTestCase)
Display *bar_ptr when stopped on a function with forward declaration of struct bar. ... ok

----------------------------------------------------------------------
Ran 2 tests in 5.659s

OK

The 'Session ...' verbiage is recently introduced (see also the '-s' option) to
notify the directory containing the session logs for test failures or errors.
In case there is any test failure/error, a similar message is appended at the
end of the stderr output for your convenience.

Environment variables related to loggings:

o LLDB_LOG: if defined, specifies the log file pathname for the 'lldb' subsystem
  with a default option of 'event process' if LLDB_LOG_OPTION is not defined.

o GDB_REMOTE_LOG: if defined, specifies the log file pathname for the
  'process.gdb-remote' subsystem with a default option of 'packets' if
  GDB_REMOTE_LOG_OPTION is not defined.
"""
    sys.exit(0)


def unique_string_match(yourentry,list):
	candidate = None
	for item in list:
		if item.startswith(yourentry):
			if candidate:
				return None
			candidate = item
	return candidate

class ArgParseNamespace(object):
    pass

def parseOptionsAndInitTestdirs():
    """Initialize the list of directories containing our unittest scripts.

    '-h/--help as the first option prints out usage info and exit the program.
    """

    global dont_do_python_api_test
    global just_do_python_api_test
    global just_do_benchmarks_test
    global dont_do_dsym_test
    global dont_do_dwarf_test
    global blacklist
    global blacklistConfig
    global categoriesList
    global validCategories
    global useCategories
    global lldbFrameworkPath
    global lldbExecutablePath
    global configFile
    global archs
    global compilers
    global count
    global delay
    global dumpSysPath
    global bmExecutable
    global bmBreakpointSpec
    global bmIterationCount
    global failfast
    global filters
    global fs4all
    global ignore
    global progress_bar
    global runHooks
    global skip_build_and_cleanup
    global skip_long_running_test
    global noHeaders
    global parsable
    global regexp
    global rdir
    global sdir_name
    global svn_silent
    global verbose
    global testdirs

    do_help = False

    parser = argparse.ArgumentParser(description='description', prefix_chars='+-', add_help=False)
    group = None

    # Helper function for boolean options (group will point to the current group when executing X)
    X = lambda optstr, helpstr, **kwargs: group.add_argument(optstr, help=helpstr, action='store_true', **kwargs)

    group = parser.add_argument_group('Help')
    group.add_argument('-h', '--help', dest='h', action='store_true', help="Print this help message and exit.  Add '-v' for more detailed help.")

    # C and Python toolchain options
    group = parser.add_argument_group('Toolchain options')
    group.add_argument('-A', '--arch', metavar='arch', action='append', dest='archs', help=textwrap.dedent('''Specify the architecture(s) to test. This option can be specified more than once'''))
    group.add_argument('-C', '--compiler', metavar='compiler', dest='compilers', action='append', help=textwrap.dedent('''Specify the compiler(s) used to build the inferior executables. The compiler path can be an executable basename or a full path to a compiler executable. This option can be specified multiple times.'''))
    # FIXME? This won't work for different extra flags according to each arch.
    group.add_argument('-E', metavar='extra-flags', help=textwrap.dedent('''Specify the extra flags to be passed to the toolchain when building the inferior programs to be debugged
                                                           suggestions: do not lump the "-A arch1 -A arch2" together such that the -E option applies to only one of the architectures'''))
    X('-D', 'Dump the Python sys.path variable')

    # Test filtering options
    group = parser.add_argument_group('Test filtering options')
    group.add_argument('-N', choices=['dwarf', 'dsym'], help="Don't do test cases marked with the @dsym decorator by passing 'dsym' as the option arg, or don't do test cases marked with the @dwarf decorator by passing 'dwarf' as the option arg")
    X('-a', "Don't do lldb Python API tests")
    X('+a', "Just do lldb Python API tests. Do not specify along with '+a'", dest='plus_a')
    X('+b', 'Just do benchmark tests', dest='plus_b')
    group.add_argument('-b', metavar='blacklist', help='Read a blacklist file specified after this option')
    group.add_argument('-f', metavar='filterspec', action='append', help='Specify a filter, which consists of the test class name, a dot, followed by the test method, to only admit such test into the test suite')  # FIXME: Example?
    X('-g', 'If specified, the filterspec by -f is not exclusive, i.e., if a test module does not match the filterspec (testclass.testmethod), the whole module is still admitted to the test suite')
    X('-l', "Don't skip long running tests")
    group.add_argument('-p', metavar='pattern', help='Specify a regexp filename pattern for inclusion in the test suite')
    group.add_argument('-X', metavar='directory', help="Exclude a directory from consideration for test discovery. -X types => if 'types' appear in the pathname components of a potential testfile, it will be ignored")
    group.add_argument('-G', '--category', metavar='category', action='append', dest='categoriesList', help=textwrap.dedent('''Specify categories of test cases of interest. Can be specified more than once.'''))

    # Configuration options
    group = parser.add_argument_group('Configuration options')
    group.add_argument('-c', metavar='config-file', help='Read a config file specified after this option')  # FIXME: additional doc.
    group.add_argument('--framework', metavar='framework-path', help='The path to LLDB.framework')
    group.add_argument('--executable', metavar='executable-path', help='The path to the lldb executable')
    group.add_argument('-e', metavar='benchmark-exe', help='Specify the full path of an executable used for benchmark purposes (see also: -x)')
    group.add_argument('-k', metavar='command', action='append', help="Specify a runhook, which is an lldb command to be executed by the debugger; The option can occur multiple times. The commands are executed one after the other to bring the debugger to a desired state, so that, for example, further benchmarking can be done")
    group.add_argument('-R', metavar='dir', help='Specify a directory to relocate the tests and their intermediate files to. BE WARNED THAT the directory, if exists, will be deleted before running this test driver. No cleanup of intermediate test files is performed in this case')
    group.add_argument('-r', metavar='dir', help="Similar to '-R', except that the directory must not exist before running this test driver")
    group.add_argument('-s', metavar='name', help='Specify the name of the dir created to store the session files of tests with errored or failed status. If not specified, the test driver uses the timestamp as the session dir name')
    group.add_argument('-x', metavar='breakpoint-spec', help='Specify the breakpoint specification for the benchmark executable')
    group.add_argument('-y', type=int, metavar='count', help="Specify the iteration count used to collect our benchmarks. An example is the number of times to do 'thread step-over' to measure stepping speed.")
    group.add_argument('-#', type=int, metavar='sharp', dest='sharp', help='Repeat the test suite for a specified number of times')

    # Test-suite behaviour
    group = parser.add_argument_group('Runtime behaviour options')
    X('-d', 'Delay startup for 10 seconds (in order for the debugger to attach)')
    X('-F', 'Fail fast. Stop the test suite on the first error/failure')
    X('-i', "Ignore (don't bailout) if 'lldb.py' module cannot be located in the build tree relative to this script; use PYTHONPATH to locate the module")
    X('-n', "Don't print the headers like build dir, lldb version, and svn info at all")
    X('-P', "Use the graphic progress bar.")
    X('-q', "Don't print extra output from this script.")
    X('-S', "Skip the build and cleanup while running the test. Use this option with care as you would need to build the inferior(s) by hand and build the executable(s) with the correct name(s). This can be used with '-# n' to stress test certain test cases for n number of times")
    X('-t', 'Turn on tracing of lldb command and other detailed test executions')
    group.add_argument('-u', dest='unset_env_varnames', metavar='variable', action='append', help='Specify an environment variable to unset before running the test cases. e.g., -u DYLD_INSERT_LIBRARIES -u MallocScribble')
    X('-v', 'Do verbose mode of unittest framework (print out each test case invocation)')
    X('-w', 'Insert some wait time (currently 0.5 sec) between consecutive test cases')
    X('-T', 'Obtain and dump svn information for this checkout of LLDB (off by default)')

    # Remove the reference to our helper function
    del X

    group = parser.add_argument_group('Test directories')
    group.add_argument('args', metavar='test-dir', nargs='*', help='Specify a list of directory names to search for test modules named after Test*.py (test discovery). If empty, search from the current working directory instead.')

    args = ArgParseNamespace()

    if ('LLDB_TEST_ARGUMENTS' in os.environ):
        print "Arguments passed through environment: '%s'" % os.environ['LLDB_TEST_ARGUMENTS']
        args = parser.parse_args([sys.argv[0]].__add__(os.environ['LLDB_TEST_ARGUMENTS'].split()),namespace=args)

    args = parser.parse_args(namespace=args)

    platform_system = platform.system()
    platform_machine = platform.machine()
    
    if args.unset_env_varnames:
        for env_var in args.unset_env_varnames:
            if env_var in os.environ:
                # From Python Doc: When unsetenv() is supported, deletion of items in os.environ
                # is automatically translated into a corresponding call to unsetenv().
                del os.environ[env_var]
                #os.unsetenv(env_var)
    
    # only print the args if being verbose (and parsable is off)
    if args.v and not args.q:
        print args

    if args.h:
        do_help = True

    if args.archs:
        archs = args.archs
    else:
        if platform_system == 'Darwin' and platform_machine == 'x86_64':
            archs = ['x86_64', 'i386']
        else:
            archs = [platform_machine]

    if args.categoriesList:
        finalCategoriesList = []
        for category in args.categoriesList:
            origCategory = category
            if not(category in validCategories):
                category = unique_string_match(category,validCategories)
            if not(category in validCategories) or category == None:
                print "fatal error: category '" + origCategory + "' is not a valid category"
                print "if you have added a new category, please edit dotest.py, adding your new category to validCategories"
                print "else, please specify one or more of the following: " + str(validCategories.keys())
                sys.exit(1)
            finalCategoriesList.append(category)
        categoriesList = set(finalCategoriesList)
        useCategories = True
    else:
        categoriesList = []

    if args.compilers:
        compilers = args.compilers
    else:
        compilers = ['clang']

    if args.D:
        dumpSysPath = True

    if args.E:
        cflags_extras = args.E
        os.environ['CFLAGS_EXTRAS'] = cflags_extras

    # argparse makes sure we have correct options
    if args.N == 'dwarf':
        dont_do_dwarf_test = True
    elif args.N == 'dsym':
        dont_do_dsym_test = True

    if args.a:
        dont_do_python_api_test = True

    if args.plus_a:
        if dont_do_python_api_test:
            print "Warning: -a and +a can't both be specified! Using only -a"
        else:
            just_do_python_api_test = True

    if args.plus_b:
        just_do_benchmarks_test = True

    if args.b:
        if args.b.startswith('-'):
            usage(parser)
        blacklistFile = args.b
        if not os.path.isfile(blacklistFile):
            print 'Blacklist file:', blacklistFile, 'does not exist!'
            usage(parser)
        # Now read the blacklist contents and assign it to blacklist.
        execfile(blacklistFile, globals(), blacklistConfig)
        blacklist = blacklistConfig.get('blacklist')

    if args.c:
        if args.c.startswith('-'):
            usage(parser)
        configFile = args.c
        if not os.path.isfile(configFile):
            print 'Config file:', configFile, 'does not exist!'
            usage(parser)

    if args.d:
        delay = True

    if args.e:
        if args.e.startswith('-'):
            usage(parser)
        bmExecutable = args.e
        if not is_exe(bmExecutable):
            usage(parser)

    if args.F:
        failfast = True

    if args.f:
        if any([x.startswith('-') for x in args.f]):
            usage(parser)
        filters.extend(args.f)

    if args.g:
        fs4all = False

    if args.i:
        ignore = True

    if args.k:
        runHooks.extend(args.k)

    if args.l:
        skip_long_running_test = False

    if args.framework:
        lldbFrameworkPath = args.framework

    if args.executable:
        lldbExecutablePath = args.executable

    if args.n:
        noHeaders = True

    if args.p:
        if args.p.startswith('-'):
            usage(parser)
        regexp = args.p

    if args.q:
        noHeaders = True
        parsable = True

    if args.P:
        progress_bar = True
        verbose = 0

    if args.R:
        if args.R.startswith('-'):
            usage(parser)
        rdir = os.path.abspath(args.R)
        if os.path.exists(rdir):
            import shutil
            print 'Removing tree:', rdir
            shutil.rmtree(rdir)

    if args.r:
        if args.r.startswith('-'):
            usage(parser)
        rdir = os.path.abspath(args.r)
        if os.path.exists(rdir):
            print 'Relocated directory:', rdir, 'must not exist!'
            usage(parser)

    if args.S:
        skip_build_and_cleanup = True

    if args.s:
        if args.s.startswith('-'):
            usage(parser)
        sdir_name = args.s

    if args.t:
        os.environ['LLDB_COMMAND_TRACE'] = 'YES'

    if args.T:
        svn_silent = False

    if args.v:
        verbose = 2

    if args.w:
        os.environ['LLDB_WAIT_BETWEEN_TEST_CASES'] = 'YES'

    if args.X:
        if args.X.startswith('-'):
            usage(parser)
        excluded.add(args.X)

    if args.x:
        if args.x.startswith('-'):
            usage(parser)
        bmBreakpointSpec = args.x

    # argparse makes sure we have a number
    if args.y:
        bmIterationCount = args.y

    # argparse makes sure we have a number
    if args.sharp:
        count = args.sharp

    if do_help == True:
        usage(parser)

    # Do not specify both '-a' and '+a' at the same time.
    if dont_do_python_api_test and just_do_python_api_test:
        usage(parser)

    # Gather all the dirs passed on the command line.
    if len(args.args) > 0:
        testdirs = map(os.path.abspath, args.args)

    # If '-r dir' is specified, the tests should be run under the relocated
    # directory.  Let's copy the testdirs over.
    if rdir:
        from shutil import copytree, ignore_patterns

        tmpdirs = []
        orig_testdirs = testdirs[:]
        for srcdir in testdirs:
            # For example, /Volumes/data/lldb/svn/ToT/test/functionalities/watchpoint/hello_watchpoint
            # shall be split into ['/Volumes/data/lldb/svn/ToT/', 'functionalities/watchpoint/hello_watchpoint'].
            # Utilize the relative path to the 'test' directory to make our destination dir path.
            if ("test" + os.sep) in srcdir:
                to_split_on = "test" + os.sep
            else:
                to_split_on = "test"
            dstdir = os.path.join(rdir, srcdir.split(to_split_on)[1])
            dstdir = dstdir.rstrip(os.sep)
            # Don't copy the *.pyc and .svn stuffs.
            copytree(srcdir, dstdir, ignore=ignore_patterns('*.pyc', '.svn'))
            tmpdirs.append(dstdir)

        # This will be our modified testdirs.
        testdirs = tmpdirs

        # With '-r dir' specified, there's no cleanup of intermediate test files.
        os.environ["LLDB_DO_CLEANUP"] = 'NO'

        # If the original testdirs is ['test'], the make directory has already been copied
        # recursively and is contained within the rdir/test dir.  For anything
        # else, we would need to copy over the make directory and its contents,
        # so that, os.listdir(rdir) looks like, for example:
        #
        #     array_types conditional_break make
        #
        # where the make directory contains the Makefile.rules file.
        if len(testdirs) != 1 or os.path.basename(orig_testdirs[0]) != 'test':
            scriptdir = os.path.dirname(__file__)
            # Don't copy the .svn stuffs.
            copytree(os.path.join(scriptdir, 'make'), os.path.join(rdir, 'make'),
                     ignore=ignore_patterns('.svn'))

    #print "testdirs:", testdirs

    # Source the configFile if specified.
    # The side effect, if any, will be felt from this point on.  An example
    # config file may be these simple two lines:
    #
    # sys.stderr = open("/tmp/lldbtest-stderr", "w")
    # sys.stdout = open("/tmp/lldbtest-stdout", "w")
    #
    # which will reassign the two file objects to sys.stderr and sys.stdout,
    # respectively.
    #
    # See also lldb-trunk/examples/test/usage-config.
    global config, pre_flight, post_flight
    if configFile:
        # Pass config (a dictionary) as the locals namespace for side-effect.
        execfile(configFile, globals(), config)
        print "config:", config
        if "pre_flight" in config:
            pre_flight = config["pre_flight"]
            if not callable(pre_flight):
                print "fatal error: pre_flight is not callable, exiting."
                sys.exit(1)
        if "post_flight" in config:
            post_flight = config["post_flight"]
            if not callable(post_flight):
                print "fatal error: post_flight is not callable, exiting."
                sys.exit(1)
        #print "sys.stderr:", sys.stderr
        #print "sys.stdout:", sys.stdout


def setupSysPath():
    """
    Add LLDB.framework/Resources/Python to the search paths for modules.
    As a side effect, we also discover the 'lldb' executable and export it here.
    """

    global rdir
    global testdirs
    global dumpSysPath
    global noHeaders
    global svn_info
    global svn_silent
    global lldbFrameworkPath
    global lldbExecutablePath

    # Get the directory containing the current script.
    if ("DOTEST_PROFILE" in os.environ or "DOTEST_PDB" in os.environ) and "DOTEST_SCRIPT_DIR" in os.environ:
        scriptPath = os.environ["DOTEST_SCRIPT_DIR"]
    else:
        scriptPath = sys.path[0]
    if not scriptPath.endswith('test'):
        print "This script expects to reside in lldb's test directory."
        sys.exit(-1)

    if rdir:
        # Set up the LLDB_TEST environment variable appropriately, so that the
        # individual tests can be located relatively.
        #
        # See also lldbtest.TestBase.setUpClass(cls).
        if len(testdirs) == 1 and os.path.basename(testdirs[0]) == 'test':
            os.environ["LLDB_TEST"] = os.path.join(rdir, 'test')
        else:
            os.environ["LLDB_TEST"] = rdir
    else:
        os.environ["LLDB_TEST"] = scriptPath

    # Set up the LLDB_SRC environment variable, so that the tests can locate
    # the LLDB source code.
    os.environ["LLDB_SRC"] = os.path.join(sys.path[0], os.pardir)

    pluginPath = os.path.join(scriptPath, 'plugins')
    pexpectPath = os.path.join(scriptPath, 'pexpect-2.4')

    # Append script dir, plugin dir, and pexpect dir to the sys.path.
    sys.path.append(scriptPath)
    sys.path.append(pluginPath)
    sys.path.append(pexpectPath)

    # This is our base name component.
    base = os.path.abspath(os.path.join(scriptPath, os.pardir))

    # These are for xcode build directories.
    xcode3_build_dir = ['build']
    xcode4_build_dir = ['build', 'lldb', 'Build', 'Products']
    dbg = ['Debug']
    dbc = ['DebugClang']
    rel = ['Release']
    bai = ['BuildAndIntegration']
    python_resource_dir = ['LLDB.framework', 'Resources', 'Python']

    # Some of the tests can invoke the 'lldb' command directly.
    # We'll try to locate the appropriate executable right here.

    lldbExec = None
    if lldbExecutablePath:
        if is_exe(lldbExecutablePath):
            lldbExec = lldbExecutablePath
            lldbHere = lldbExec
        else:
            print lldbExecutablePath + " is not an executable"
            sys.exit(-1)
    else:
        # First, you can define an environment variable LLDB_EXEC specifying the
        # full pathname of the lldb executable.
        if "LLDB_EXEC" in os.environ and is_exe(os.environ["LLDB_EXEC"]):
            lldbExec = os.environ["LLDB_EXEC"]
        else:
            lldbExec = None
    
        executable = ['lldb']
        dbgExec  = os.path.join(base, *(xcode3_build_dir + dbg + executable))
        dbgExec2 = os.path.join(base, *(xcode4_build_dir + dbg + executable))
        dbcExec  = os.path.join(base, *(xcode3_build_dir + dbc + executable))
        dbcExec2 = os.path.join(base, *(xcode4_build_dir + dbc + executable))
        relExec  = os.path.join(base, *(xcode3_build_dir + rel + executable))
        relExec2 = os.path.join(base, *(xcode4_build_dir + rel + executable))
        baiExec  = os.path.join(base, *(xcode3_build_dir + bai + executable))
        baiExec2 = os.path.join(base, *(xcode4_build_dir + bai + executable))
    
        # The 'lldb' executable built here in the source tree.
        lldbHere = None
        if is_exe(dbgExec):
            lldbHere = dbgExec
        elif is_exe(dbgExec2):
            lldbHere = dbgExec2
        elif is_exe(dbcExec):
            lldbHere = dbcExec
        elif is_exe(dbcExec2):
            lldbHere = dbcExec2
        elif is_exe(relExec):
            lldbHere = relExec
        elif is_exe(relExec2):
            lldbHere = relExec2
        elif is_exe(baiExec):
            lldbHere = baiExec
        elif is_exe(baiExec2):
            lldbHere = baiExec2
        elif lldbExec:
            lldbHere = lldbExec

        # One last chance to locate the 'lldb' executable.
        if not lldbExec:
            lldbExec = which('lldb')
            if lldbHere and not lldbExec:
                lldbExec = lldbHere
            if lldbExec and not lldbHere:
                lldbHere = lldbExec
    
    if lldbHere:
        os.environ["LLDB_HERE"] = lldbHere
        os.environ["LLDB_LIB_DIR"] = os.path.split(lldbHere)[0]
        if not noHeaders:
            print "LLDB library dir:", os.environ["LLDB_LIB_DIR"]
            os.system('%s -v' % lldbHere)

    if not lldbExec:
        print "The 'lldb' executable cannot be located.  Some of the tests may not be run as a result."
    else:
        os.environ["LLDB_EXEC"] = lldbExec
        #print "The 'lldb' from PATH env variable", lldbExec

    # Skip printing svn/git information when running in parsable (lit-test compatibility) mode
    if not svn_silent and not parsable:
        if os.path.isdir(os.path.join(base, '.svn')) and which("svn") is not None:
            pipe = subprocess.Popen([which("svn"), "info", base], stdout = subprocess.PIPE)
            svn_info = pipe.stdout.read()
        elif os.path.isdir(os.path.join(base, '.git')) and which("git") is not None:
            pipe = subprocess.Popen([which("git"), "svn", "info", base], stdout = subprocess.PIPE)
            svn_info = pipe.stdout.read()
        if not noHeaders:
            print svn_info

    global ignore

    lldbPath = None
    if lldbFrameworkPath:
        candidatePath = os.path.join(lldbFrameworkPath, 'Resources', 'Python')
        if os.path.isfile(os.path.join(candidatePath, 'lldb/__init__.py')):
            lldbPath = candidatePath
        if not lldbPath:
            print 'Resources/Python/lldb/__init__.py was not found in ' + lldbFrameworkPath
            sys.exit(-1)
    else:
        # The '-i' option is used to skip looking for lldb.py in the build tree.
        if ignore:
            return
        
        # If our lldb supports the -P option, use it to find the python path:
        init_in_python_dir = 'lldb/__init__.py'
        import pexpect
        lldb_dash_p_result = None

        if lldbHere:
            lldb_dash_p_result = pexpect.run("%s -P"%(lldbHere))
        elif lldbExec:
            lldb_dash_p_result = pexpect.run("%s -P"%(lldbExec))

        if lldb_dash_p_result and not lldb_dash_p_result.startswith(("<", "lldb: invalid option:")):
            lines = lldb_dash_p_result.splitlines()
            if len(lines) == 1 and os.path.isfile(os.path.join(lines[0], init_in_python_dir)):
                lldbPath = lines[0]
                if "linux" in sys.platform:
                    os.environ['LLDB_LIB_DIR'] = os.path.join(lldbPath, '..', '..')
        
        if not lldbPath: 
            dbgPath  = os.path.join(base, *(xcode3_build_dir + dbg + python_resource_dir))
            dbgPath2 = os.path.join(base, *(xcode4_build_dir + dbg + python_resource_dir))
            dbcPath  = os.path.join(base, *(xcode3_build_dir + dbc + python_resource_dir))
            dbcPath2 = os.path.join(base, *(xcode4_build_dir + dbc + python_resource_dir))
            relPath  = os.path.join(base, *(xcode3_build_dir + rel + python_resource_dir))
            relPath2 = os.path.join(base, *(xcode4_build_dir + rel + python_resource_dir))
            baiPath  = os.path.join(base, *(xcode3_build_dir + bai + python_resource_dir))
            baiPath2 = os.path.join(base, *(xcode4_build_dir + bai + python_resource_dir))
    
            if os.path.isfile(os.path.join(dbgPath, init_in_python_dir)):
                lldbPath = dbgPath
            elif os.path.isfile(os.path.join(dbgPath2, init_in_python_dir)):
                lldbPath = dbgPath2
            elif os.path.isfile(os.path.join(dbcPath, init_in_python_dir)):
                lldbPath = dbcPath
            elif os.path.isfile(os.path.join(dbcPath2, init_in_python_dir)):
                lldbPath = dbcPath2
            elif os.path.isfile(os.path.join(relPath, init_in_python_dir)):
                lldbPath = relPath
            elif os.path.isfile(os.path.join(relPath2, init_in_python_dir)):
                lldbPath = relPath2
            elif os.path.isfile(os.path.join(baiPath, init_in_python_dir)):
                lldbPath = baiPath
            elif os.path.isfile(os.path.join(baiPath2, init_in_python_dir)):
                lldbPath = baiPath2

        if not lldbPath:
            print 'This script requires lldb.py to be in either ' + dbgPath + ',',
            print relPath + ', or ' + baiPath
            sys.exit(-1)

    # Some of the code that uses this path assumes it hasn't resolved the Versions... link.  
    # If the path we've constructed looks like that, then we'll strip out the Versions/A part.
    (before, frameWithVersion, after) = lldbPath.rpartition("LLDB.framework/Versions/A")
    if frameWithVersion != "" :
        lldbPath = before + "LLDB.framework" + after

    lldbPath = os.path.abspath(lldbPath)

    # If tests need to find LLDB_FRAMEWORK, now they can do it
    os.environ["LLDB_FRAMEWORK"] = os.path.dirname(os.path.dirname(lldbPath))

    # This is to locate the lldb.py module.  Insert it right after sys.path[0].
    sys.path[1:1] = [lldbPath]
    if dumpSysPath:
        print "sys.path:", sys.path


def doDelay(delta):
    """Delaying startup for delta-seconds to facilitate debugger attachment."""
    def alarm_handler(*args):
        raise Exception("timeout")

    signal.signal(signal.SIGALRM, alarm_handler)
    signal.alarm(delta)
    sys.stdout.write("pid=%d\n" % os.getpid())
    sys.stdout.write("Enter RET to proceed (or timeout after %d seconds):" %
                     delta)
    sys.stdout.flush()
    try:
        text = sys.stdin.readline()
    except:
        text = ""
    signal.alarm(0)
    sys.stdout.write("proceeding...\n")
    pass


def visit(prefix, dir, names):
    """Visitor function for os.path.walk(path, visit, arg)."""

    global suite
    global regexp
    global filters
    global fs4all
    global excluded

    if set(dir.split(os.sep)).intersection(excluded):
        #print "Detected an excluded dir component: %s" % dir
        return

    for name in names:
        if os.path.isdir(os.path.join(dir, name)):
            continue

        if '.py' == os.path.splitext(name)[1] and name.startswith(prefix):
            # Try to match the regexp pattern, if specified.
            if regexp:
                import re
                if re.search(regexp, name):
                    #print "Filename: '%s' matches pattern: '%s'" % (name, regexp)
                    pass
                else:
                    #print "Filename: '%s' does not match pattern: '%s'" % (name, regexp)
                    continue

            # We found a match for our test.  Add it to the suite.

            # Update the sys.path first.
            if not sys.path.count(dir):
                sys.path.insert(0, dir)
            base = os.path.splitext(name)[0]

            # Thoroughly check the filterspec against the base module and admit
            # the (base, filterspec) combination only when it makes sense.
            filterspec = None
            for filterspec in filters:
                # Optimistically set the flag to True.
                filtered = True
                module = __import__(base)
                parts = filterspec.split('.')
                obj = module
                for part in parts:
                    try:
                        parent, obj = obj, getattr(obj, part)
                    except AttributeError:
                        # The filterspec has failed.
                        filtered = False
                        break

                # If filtered, we have a good filterspec.  Add it.
                if filtered:
                    #print "adding filter spec %s to module %s" % (filterspec, module)
                    suite.addTests(
                        unittest2.defaultTestLoader.loadTestsFromName(filterspec, module))
                    continue

            # Forgo this module if the (base, filterspec) combo is invalid
            # and no '-g' option is specified
            if filters and fs4all and not filtered:
                continue

            # Add either the filtered test case(s) (which is done before) or the entire test class.
            if not filterspec or not filtered:
                # A simple case of just the module name.  Also the failover case
                # from the filterspec branch when the (base, filterspec) combo
                # doesn't make sense.
                suite.addTests(unittest2.defaultTestLoader.loadTestsFromName(base))


def lldbLoggings():
    """Check and do lldb loggings if necessary."""

    # Turn on logging for debugging purposes if ${LLDB_LOG} environment variable is
    # defined.  Use ${LLDB_LOG} to specify the log file.
    ci = lldb.DBG.GetCommandInterpreter()
    res = lldb.SBCommandReturnObject()
    if ("LLDB_LOG" in os.environ):
        if ("LLDB_LOG_OPTION" in os.environ):
            lldb_log_option = os.environ["LLDB_LOG_OPTION"]
        else:
            lldb_log_option = "event process expr state api"
        ci.HandleCommand(
            "log enable -n -f " + os.environ["LLDB_LOG"] + " lldb " + lldb_log_option,
            res)
        if not res.Succeeded():
            raise Exception('log enable failed (check LLDB_LOG env variable.')
    # Ditto for gdb-remote logging if ${GDB_REMOTE_LOG} environment variable is defined.
    # Use ${GDB_REMOTE_LOG} to specify the log file.
    if ("GDB_REMOTE_LOG" in os.environ):
        if ("GDB_REMOTE_LOG_OPTION" in os.environ):
            gdb_remote_log_option = os.environ["GDB_REMOTE_LOG_OPTION"]
        else:
            gdb_remote_log_option = "packets process"
        ci.HandleCommand(
            "log enable -n -f " + os.environ["GDB_REMOTE_LOG"] + " gdb-remote "
            + gdb_remote_log_option,
            res)
        if not res.Succeeded():
            raise Exception('log enable failed (check GDB_REMOTE_LOG env variable.')

def getMyCommandLine():
    ps = subprocess.Popen([which('ps'), '-o', "command=CMD", str(os.getpid())], stdout=subprocess.PIPE).communicate()[0]
    lines = ps.split('\n')
    cmd_line = lines[1]
    return cmd_line

# ======================================== #
#                                          #
# Execution of the test driver starts here #
#                                          #
# ======================================== #

def checkDsymForUUIDIsNotOn():
    cmd = ["defaults", "read", "com.apple.DebugSymbols"]
    pipe = subprocess.Popen(cmd, stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
    cmd_output = pipe.stdout.read()
    if cmd_output and "DBGFileMappedPaths = " in cmd_output:
        print "%s =>" % ' '.join(cmd)
        print cmd_output
        print "Disable automatic lookup and caching of dSYMs before running the test suite!"
        print "Exiting..."
        sys.exit(0)

# On MacOS X, check to make sure that domain for com.apple.DebugSymbols defaults
# does not exist before proceeding to running the test suite.
if sys.platform.startswith("darwin"):
    checkDsymForUUIDIsNotOn()

#
# Start the actions by first parsing the options while setting up the test
# directories, followed by setting up the search paths for lldb utilities;
# then, we walk the directory trees and collect the tests into our test suite.
#
parseOptionsAndInitTestdirs()
setupSysPath()

#
# If '-d' is specified, do a delay of 10 seconds for the debugger to attach.
#
if delay:
    doDelay(10)

#
# If '-l' is specified, do not skip the long running tests.
if not skip_long_running_test:
    os.environ["LLDB_SKIP_LONG_RUNNING_TEST"] = "NO"

#
# Walk through the testdirs while collecting tests.
#
for testdir in testdirs:
    os.path.walk(testdir, visit, 'Test')

#
# Now that we have loaded all the test cases, run the whole test suite.
#

# For the time being, let's bracket the test runner within the
# lldb.SBDebugger.Initialize()/Terminate() pair.
import lldb, atexit
# Update: the act of importing lldb now executes lldb.SBDebugger.Initialize(),
# there's no need to call it a second time.
#lldb.SBDebugger.Initialize()
atexit.register(lambda: lldb.SBDebugger.Terminate())

# Create a singleton SBDebugger in the lldb namespace.
lldb.DBG = lldb.SBDebugger.Create()

# Put the blacklist in the lldb namespace, to be used by lldb.TestBase.
lldb.blacklist = blacklist

# The pre_flight and post_flight come from reading a config file.
lldb.pre_flight = pre_flight
lldb.post_flight = post_flight
def getsource_if_available(obj):
    """
    Return the text of the source code for an object if available.  Otherwise,
    a print representation is returned.
    """
    import inspect
    try:
        return inspect.getsource(obj)
    except:
        return repr(obj)

if not noHeaders:
    print "lldb.pre_flight:", getsource_if_available(lldb.pre_flight)
    print "lldb.post_flight:", getsource_if_available(lldb.post_flight)

# Put all these test decorators in the lldb namespace.
lldb.dont_do_python_api_test = dont_do_python_api_test
lldb.just_do_python_api_test = just_do_python_api_test
lldb.just_do_benchmarks_test = just_do_benchmarks_test
lldb.dont_do_dsym_test = dont_do_dsym_test
lldb.dont_do_dwarf_test = dont_do_dwarf_test

# Do we need to skip build and cleanup?
lldb.skip_build_and_cleanup = skip_build_and_cleanup

# Put bmExecutable, bmBreakpointSpec, and bmIterationCount into the lldb namespace, too.
lldb.bmExecutable = bmExecutable
lldb.bmBreakpointSpec = bmBreakpointSpec
lldb.bmIterationCount = bmIterationCount

# And don't forget the runHooks!
lldb.runHooks = runHooks

# Turn on lldb loggings if necessary.
lldbLoggings()

# Install the control-c handler.
unittest2.signals.installHandler()

# If sdir_name is not specified through the '-s sdir_name' option, get a
# timestamp string and export it as LLDB_SESSION_DIR environment var.  This will
# be used when/if we want to dump the session info of individual test cases
# later on.
#
# See also TestBase.dumpSessionInfo() in lldbtest.py.
import datetime
# The windows platforms don't like ':' in the pathname.
timestamp_started = datetime.datetime.now().strftime("%Y-%m-%d-%H_%M_%S")
if not sdir_name:
    sdir_name = timestamp_started
os.environ["LLDB_SESSION_DIRNAME"] = os.path.join(os.getcwd(), sdir_name)

if not noHeaders:
    sys.stderr.write("\nSession logs for test failures/errors/unexpected successes"
                     " will go into directory '%s'\n" % sdir_name)
    sys.stderr.write("Command invoked: %s\n" % getMyCommandLine())

if not os.path.isdir(sdir_name):
    os.mkdir(sdir_name)
where_to_save_session = os.getcwd()
fname = os.path.join(sdir_name, "TestStarted")
with open(fname, "w") as f:
    print >> f, "Test started at: %s\n" % timestamp_started
    print >> f, svn_info
    print >> f, "Command invoked: %s\n" % getMyCommandLine()

#
# Invoke the default TextTestRunner to run the test suite, possibly iterating
# over different configurations.
#

iterArchs = False
iterCompilers = False

if not archs and "archs" in config:
    archs = config["archs"]

if isinstance(archs, list) and len(archs) >= 1:
    iterArchs = True

if not compilers and "compilers" in config:
    compilers = config["compilers"]

#
# Add some intervention here to sanity check that the compilers requested are sane.
# If found not to be an executable program, the invalid one is dropped from the list.
for i in range(len(compilers)):
    c = compilers[i]
    if which(c):
        continue
    else:
        if sys.platform.startswith("darwin"):
            pipe = subprocess.Popen(['xcrun', '-find', c], stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
            cmd_output = pipe.stdout.read()
            if cmd_output:
                if "not found" in cmd_output:
                    print "dropping %s from the compilers used" % c
                    compilers.remove(i)
                else:
                    compilers[i] = cmd_output.split('\n')[0]
                    print "'xcrun -find %s' returning %s" % (c, compilers[i])

if not parsable:
    print "compilers=%s" % str(compilers)

if not compilers or len(compilers) == 0:
    print "No eligible compiler found, exiting."
    sys.exit(1)

if isinstance(compilers, list) and len(compilers) >= 1:
    iterCompilers = True

# Make a shallow copy of sys.path, we need to manipulate the search paths later.
# This is only necessary if we are relocated and with different configurations.
if rdir:
    old_sys_path = sys.path[:]
# If we iterate on archs or compilers, there is a chance we want to split stderr/stdout.
if iterArchs or iterCompilers:
    old_stderr = sys.stderr
    old_stdout = sys.stdout
    new_stderr = None
    new_stdout = None

# Iterating over all possible architecture and compiler combinations.
for ia in range(len(archs) if iterArchs else 1):
    archConfig = ""
    if iterArchs:
        os.environ["ARCH"] = archs[ia]
        archConfig = "arch=%s" % archs[ia]
    for ic in range(len(compilers) if iterCompilers else 1):
        if iterCompilers:
            os.environ["CC"] = compilers[ic]
            configString = "%s compiler=%s" % (archConfig, compilers[ic])
        else:
            configString = archConfig

        if iterArchs or iterCompilers:
            # Translate ' ' to '-' for pathname component.
            from string import maketrans
            tbl = maketrans(' ', '-')
            configPostfix = configString.translate(tbl)

            # Check whether we need to split stderr/stdout into configuration
            # specific files.
            if old_stderr.name != '<stderr>' and config.get('split_stderr'):
                if new_stderr:
                    new_stderr.close()
                new_stderr = open("%s.%s" % (old_stderr.name, configPostfix), "w")
                sys.stderr = new_stderr
            if old_stdout.name != '<stdout>' and config.get('split_stdout'):
                if new_stdout:
                    new_stdout.close()
                new_stdout = open("%s.%s" % (old_stdout.name, configPostfix), "w")
                sys.stdout = new_stdout

            # If we specified a relocated directory to run the test suite, do
            # the extra housekeeping to copy the testdirs to a configStringified
            # directory and to update sys.path before invoking the test runner.
            # The purpose is to separate the configuration-specific directories
            # from each other.
            if rdir:
                from shutil import copytree, rmtree, ignore_patterns

                newrdir = "%s.%s" % (rdir, configPostfix)

                # Copy the tree to a new directory with postfix name configPostfix.
                if os.path.exists(newrdir):
                    rmtree(newrdir)
                copytree(rdir, newrdir, ignore=ignore_patterns('*.pyc', '*.o', '*.d'))

                # Update the LLDB_TEST environment variable to reflect new top
                # level test directory.
                #
                # See also lldbtest.TestBase.setUpClass(cls).
                if len(testdirs) == 1 and os.path.basename(testdirs[0]) == 'test':
                    os.environ["LLDB_TEST"] = os.path.join(newrdir, 'test')
                else:
                    os.environ["LLDB_TEST"] = newrdir

                # And update the Python search paths for modules.
                sys.path = [x.replace(rdir, newrdir, 1) for x in old_sys_path]

            # Output the configuration.
            if not parsable:
                sys.stderr.write("\nConfiguration: " + configString + "\n")

        #print "sys.stderr name is", sys.stderr.name
        #print "sys.stdout name is", sys.stdout.name

        # First, write out the number of collected test cases.
        if not parsable:
            sys.stderr.write(separator + "\n")
            sys.stderr.write("Collected %d test%s\n\n"
                             % (suite.countTestCases(),
                                suite.countTestCases() != 1 and "s" or ""))

        class LLDBTestResult(unittest2.TextTestResult):
            """
            Enforce a singleton pattern to allow introspection of test progress.

            Overwrite addError(), addFailure(), and addExpectedFailure() methods
            to enable each test instance to track its failure/error status.  It
            is used in the LLDB test framework to emit detailed trace messages
            to a log file for easier human inspection of test failres/errors.
            """
            __singleton__ = None
            __ignore_singleton__ = False

            @staticmethod
            def getTerminalSize():
                import os
                env = os.environ
                def ioctl_GWINSZ(fd):
                    try:
                        import fcntl, termios, struct, os
                        cr = struct.unpack('hh', fcntl.ioctl(fd, termios.TIOCGWINSZ,
                    '1234'))
                    except:
                        return
                    return cr
                cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)
                if not cr:
                    try:
                        fd = os.open(os.ctermid(), os.O_RDONLY)
                        cr = ioctl_GWINSZ(fd)
                        os.close(fd)
                    except:
                        pass
                if not cr:
                    cr = (env.get('LINES', 25), env.get('COLUMNS', 80))
                return int(cr[1]), int(cr[0])

            def __init__(self, *args):
                if not LLDBTestResult.__ignore_singleton__ and LLDBTestResult.__singleton__:
                    raise Exception("LLDBTestResult instantiated more than once")
                super(LLDBTestResult, self).__init__(*args)
                LLDBTestResult.__singleton__ = self
                # Now put this singleton into the lldb module namespace.
                lldb.test_result = self
                # Computes the format string for displaying the counter.
                global suite
                counterWidth = len(str(suite.countTestCases()))
                self.fmt = "%" + str(counterWidth) + "d: "
                self.indentation = ' ' * (counterWidth + 2)
                # This counts from 1 .. suite.countTestCases().
                self.counter = 0
                (width, height) = LLDBTestResult.getTerminalSize()
                self.progressbar = None
                global progress_bar
                if width > 10 and not parsable and progress_bar:
                    try:
                        self.progressbar = progress.ProgressWithEvents(stdout=self.stream,start=0,end=suite.countTestCases(),width=width-10)
                    except:
                        self.progressbar = None

            def _config_string(self, test):
              compiler = getattr(test, "getCompiler", None)
              arch = getattr(test, "getArchitecture", None)
              return "%s-%s" % (compiler() if compiler else "", arch() if arch else "")

            def _exc_info_to_string(self, err, test):
                """Overrides superclass TestResult's method in order to append
                our test config info string to the exception info string."""
                modified_exc_string = '%sConfig=%s-%s' % (super(LLDBTestResult, self)._exc_info_to_string(err, test),
                                                          test.getArchitecture(),
                                                          test.getCompiler())
                return modified_exc_string

            def getDescription(self, test):
                doc_first_line = test.shortDescription()
                if self.descriptions and doc_first_line:
                    return '\n'.join((str(test), self.indentation + doc_first_line))
                else:
                    return str(test)

            def getCategoriesForTest(self,test):
                if hasattr(test,"_testMethodName"):
                    test_method = getattr(test,"_testMethodName")
                    test_method = getattr(test,test_method)
                else:
                    test_method = None
                if test_method != None and hasattr(test_method,"getCategories"):
                    test_categories = test_method.getCategories(test)
                elif hasattr(test,"getCategories"):
                    test_categories = test.getCategories()
                elif inspect.ismethod(test) and test.__self__ != None and hasattr(test.__self__,"getCategories"):
                    test_categories = test.__self__.getCategories()
                else:
                    test_categories = []
                if test_categories == None:
                    test_categories = []
                return test_categories

            def shouldSkipBecauseOfCategories(self,test):
                global useCategories
                import inspect
                if useCategories:
                    global categoriesList
                    test_categories = self.getCategoriesForTest(test)
                    if len(test_categories) == 0 or len(categoriesList & set(test_categories)) == 0:
                        return True
                return False

            def hardMarkAsSkipped(self,test):
                getattr(test, test._testMethodName).__func__.__unittest_skip__ = True
                getattr(test, test._testMethodName).__func__.__unittest_skip_why__ = "test case does not fall in any category of interest for this run"
                test.__class__.__unittest_skip__ = True
                test.__class__.__unittest_skip_why__ = "test case does not fall in any category of interest for this run"

            def startTest(self, test):
                if self.shouldSkipBecauseOfCategories(test):
                    self.hardMarkAsSkipped(test)
                self.counter += 1
                if self.showAll:
                    self.stream.write(self.fmt % self.counter)
                super(LLDBTestResult, self).startTest(test)

            def addSuccess(self, test):
                global parsable
                super(LLDBTestResult, self).addSuccess(test)
                if parsable:
                    self.stream.write("PASS: LLDB (%s) :: %s\n" % (self._config_string(test), str(test)))

            def addError(self, test, err):
                global sdir_has_content
                global parsable
                sdir_has_content = True
                super(LLDBTestResult, self).addError(test, err)
                method = getattr(test, "markError", None)
                if method:
                    method()
                if parsable:
                    self.stream.write("FAIL: LLDB (%s) :: %s\n" % (self._config_string(test), str(test)))

            def addFailure(self, test, err):
                global sdir_has_content
                global failuresPerCategory
                global parsable
                sdir_has_content = True
                super(LLDBTestResult, self).addFailure(test, err)
                method = getattr(test, "markFailure", None)
                if method:
                    method()
                if parsable:
                    self.stream.write("FAIL: LLDB (%s) :: %s\n" % (self._config_string(test), str(test)))
                if useCategories:
                    test_categories = self.getCategoriesForTest(test)
                    for category in test_categories:
                        if category in failuresPerCategory:
                            failuresPerCategory[category] = failuresPerCategory[category] + 1
                        else:
                            failuresPerCategory[category] = 1

            def addExpectedFailure(self, test, err, bugnumber):
                global sdir_has_content
                global parsable
                sdir_has_content = True
                super(LLDBTestResult, self).addExpectedFailure(test, err, bugnumber)
                method = getattr(test, "markExpectedFailure", None)
                if method:
                    method(err, bugnumber)
                if parsable:
                    self.stream.write("XFAIL: LLDB (%s) :: %s\n" % (self._config_string(test), str(test)))

            def addSkip(self, test, reason):
                global sdir_has_content
                global parsable
                sdir_has_content = True
                super(LLDBTestResult, self).addSkip(test, reason)
                method = getattr(test, "markSkippedTest", None)
                if method:
                    method()
                if parsable:
                    self.stream.write("UNSUPPORTED: LLDB (%s) :: %s (%s) \n" % (self._config_string(test), str(test), reason))

            def addUnexpectedSuccess(self, test, bugnumber):
                global sdir_has_content
                global parsable
                sdir_has_content = True
                super(LLDBTestResult, self).addUnexpectedSuccess(test, bugnumber)
                method = getattr(test, "markUnexpectedSuccess", None)
                if method:
                    method(bugnumber)
                if parsable:
                    self.stream.write("XPASS: LLDB (%s) :: %s\n" % (self._config_string(test), str(test)))

        if parsable:
            v = 0
        elif progress_bar:
            v = 1
        else:
            v = verbose

        # Invoke the test runner.
        if count == 1:
            result = unittest2.TextTestRunner(stream=sys.stderr,
                                              verbosity=v,
                                              failfast=failfast,
                                              resultclass=LLDBTestResult).run(suite)
        else:
            # We are invoking the same test suite more than once.  In this case,
            # mark __ignore_singleton__ flag as True so the signleton pattern is
            # not enforced.
            LLDBTestResult.__ignore_singleton__ = True
            for i in range(count):
               
                result = unittest2.TextTestRunner(stream=sys.stderr,
                                                  verbosity=v,
                                                  failfast=failfast,
                                                  resultclass=LLDBTestResult).run(suite)

        failed = failed or not result.wasSuccessful()

if sdir_has_content and not parsable:
    sys.stderr.write("Session logs for test failures/errors/unexpected successes"
                     " can be found in directory '%s'\n" % sdir_name)

if useCategories and len(failuresPerCategory) > 0:
    sys.stderr.write("Failures per category:\n")
    for category in failuresPerCategory:
        sys.stderr.write("%s - %d\n" % (category,failuresPerCategory[category]))

os.chdir(where_to_save_session)
fname = os.path.join(sdir_name, "TestFinished")
with open(fname, "w") as f:
    print >> f, "Test finished at: %s\n" % datetime.datetime.now().strftime("%Y-%m-%d-%H_%M_%S")

# Terminate the test suite if ${LLDB_TESTSUITE_FORCE_FINISH} is defined.
# This should not be necessary now.
if ("LLDB_TESTSUITE_FORCE_FINISH" in os.environ):
    print "Terminating Test suite..."
    subprocess.Popen(["/bin/sh", "-c", "kill %s; exit 0" % (os.getpid())])

# Exiting.
sys.exit(failed)