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#!/usr/bin/env python

"""
lit - LLVM Integrated Tester.

See lit.pod for more information.
"""

from __future__ import absolute_import
import math, os, platform, random, re, sys, time

import lit.ProgressBar
import lit.LitConfig
import lit.Test
import lit.run
import lit.util
import lit.discovery

class TestingProgressDisplay(object):
    def __init__(self, opts, numTests, progressBar=None):
        self.opts = opts
        self.numTests = numTests
        self.current = None
        self.progressBar = progressBar
        self.completed = 0

    def finish(self):
        if self.progressBar:
            self.progressBar.clear()
        elif self.opts.quiet:
            pass
        elif self.opts.succinct:
            sys.stdout.write('\n')

    def update(self, test):
        self.completed += 1

        if self.opts.incremental:
            update_incremental_cache(test)

        if self.progressBar:
            self.progressBar.update(float(self.completed)/self.numTests,
                                    test.getFullName())

        if not test.result.code.isFailure and \
                (self.opts.quiet or self.opts.succinct):
            return

        if self.progressBar:
            self.progressBar.clear()

        # Show the test result line.
        test_name = test.getFullName()
        print('%s: %s (%d of %d)' % (test.result.code.name, test_name,
                                     self.completed, self.numTests))

        # Show the test failure output, if requested.
        if test.result.code.isFailure and self.opts.showOutput:
            print("%s TEST '%s' FAILED %s" % ('*'*20, test.getFullName(),
                                              '*'*20))
            print(test.result.output)
            print("*" * 20)

        # Report test metrics, if present.
        if test.result.metrics:
            print("%s TEST '%s' RESULTS %s" % ('*'*10, test.getFullName(),
                                               '*'*10))
            items = sorted(test.result.metrics.items())
            for metric_name, value in items:
                print('%s: %s ' % (metric_name, value.format()))
            print("*" * 10)

        # Ensure the output is flushed.
        sys.stdout.flush()

def write_test_results(run, lit_config, testing_time, output_path):
    try:
        import json
    except ImportError:
        lit_config.fatal('test output unsupported with Python 2.5')

    # Construct the data we will write.
    data = {}
    # Encode the current lit version as a schema version.
    data['__version__'] = lit.__versioninfo__
    data['elapsed'] = testing_time
    # FIXME: Record some information on the lit configuration used?
    # FIXME: Record information from the individual test suites?

    # Encode the tests.
    data['tests'] = tests_data = []
    for test in run.tests:
        test_data = {
            'name' : test.getFullName(),
            'code' : test.result.code.name,
            'output' : test.result.output,
            'elapsed' : test.result.elapsed }

        # Add test metrics, if present.
        if test.result.metrics:
            test_data['metrics'] = metrics_data = {}
            for key, value in test.result.metrics.items():
                metrics_data[key] = value.todata()

        tests_data.append(test_data)

    # Write the output.
    f = open(output_path, 'w')
    try:
        json.dump(data, f, indent=2, sort_keys=True)
        f.write('\n')
    finally:
        f.close()

def update_incremental_cache(test):
    if not test.result.code.isFailure:
        return
    fname = test.getFilePath()
    os.utime(fname, None)

def sort_by_incremental_cache(run):
    def sortIndex(test):
        fname = test.getFilePath()
        try:
            return -os.path.getmtime(fname)
        except:
            return 0
    run.tests.sort(key = lambda t: sortIndex(t))

def main(builtinParameters = {}):
    # Use processes by default on Unix platforms.
    isWindows = platform.system() == 'Windows'
    useProcessesIsDefault = not isWindows

    global options
    from optparse import OptionParser, OptionGroup
    parser = OptionParser("usage: %prog [options] {file-or-path}")

    parser.add_option("", "--version", dest="show_version",
                      help="Show version and exit",
                      action="store_true", default=False)
    parser.add_option("-j", "--threads", dest="numThreads", metavar="N",
                      help="Number of testing threads",
                      type=int, action="store", default=None)
    parser.add_option("", "--config-prefix", dest="configPrefix",
                      metavar="NAME", help="Prefix for 'lit' config files",
                      action="store", default=None)
    parser.add_option("", "--param", dest="userParameters",
                      metavar="NAME=VAL",
                      help="Add 'NAME' = 'VAL' to the user defined parameters",
                      type=str, action="append", default=[])

    group = OptionGroup(parser, "Output Format")
    # FIXME: I find these names very confusing, although I like the
    # functionality.
    group.add_option("-q", "--quiet", dest="quiet",
                     help="Suppress no error output",
                     action="store_true", default=False)
    group.add_option("-s", "--succinct", dest="succinct",
                     help="Reduce amount of output",
                     action="store_true", default=False)
    group.add_option("-v", "--verbose", dest="showOutput",
                     help="Show all test output",
                     action="store_true", default=False)
    group.add_option("-o", "--output", dest="output_path",
                     help="Write test results to the provided path",
                     action="store", type=str, metavar="PATH")
    group.add_option("", "--no-progress-bar", dest="useProgressBar",
                     help="Do not use curses based progress bar",
                     action="store_false", default=True)
    parser.add_option_group(group)

    group = OptionGroup(parser, "Test Execution")
    group.add_option("", "--path", dest="path",
                     help="Additional paths to add to testing environment",
                     action="append", type=str, default=[])
    group.add_option("", "--vg", dest="useValgrind",
                     help="Run tests under valgrind",
                     action="store_true", default=False)
    group.add_option("", "--vg-leak", dest="valgrindLeakCheck",
                     help="Check for memory leaks under valgrind",
                     action="store_true", default=False)
    group.add_option("", "--vg-arg", dest="valgrindArgs", metavar="ARG",
                     help="Specify an extra argument for valgrind",
                     type=str, action="append", default=[])
    group.add_option("", "--time-tests", dest="timeTests",
                     help="Track elapsed wall time for each test",
                     action="store_true", default=False)
    group.add_option("", "--no-execute", dest="noExecute",
                     help="Don't execute any tests (assume PASS)",
                     action="store_true", default=False)
    parser.add_option_group(group)

    group = OptionGroup(parser, "Test Selection")
    group.add_option("", "--max-tests", dest="maxTests", metavar="N",
                     help="Maximum number of tests to run",
                     action="store", type=int, default=None)
    group.add_option("", "--max-time", dest="maxTime", metavar="N",
                     help="Maximum time to spend testing (in seconds)",
                     action="store", type=float, default=None)
    group.add_option("", "--shuffle", dest="shuffle",
                     help="Run tests in random order",
                     action="store_true", default=False)
    group.add_option("-i", "--incremental", dest="incremental",
                     help="Run modified and failing tests first (updates "
                     "mtimes)",
                     action="store_true", default=False)
    group.add_option("", "--filter", dest="filter", metavar="REGEX",
                     help=("Only run tests with paths matching the given "
                           "regular expression"),
                     action="store", default=None)
    parser.add_option_group(group)

    group = OptionGroup(parser, "Debug and Experimental Options")
    group.add_option("", "--debug", dest="debug",
                      help="Enable debugging (for 'lit' development)",
                      action="store_true", default=False)
    group.add_option("", "--show-suites", dest="showSuites",
                      help="Show discovered test suites",
                      action="store_true", default=False)
    group.add_option("", "--show-tests", dest="showTests",
                      help="Show all discovered tests",
                      action="store_true", default=False)
    group.add_option("", "--use-processes", dest="useProcesses",
                      help="Run tests in parallel with processes (not threads)",
                      action="store_true", default=useProcessesIsDefault)
    group.add_option("", "--use-threads", dest="useProcesses",
                      help="Run tests in parallel with threads (not processes)",
                      action="store_false", default=useProcessesIsDefault)
    parser.add_option_group(group)

    (opts, args) = parser.parse_args()

    if opts.show_version:
        print("lit %s" % (lit.__version__,))
        return

    if not args:
        parser.error('No inputs specified')

    if opts.numThreads is None:
# Python <2.5 has a race condition causing lit to always fail with numThreads>1
# http://bugs.python.org/issue1731717
# I haven't seen this bug occur with 2.5.2 and later, so only enable multiple
# threads by default there.
       if sys.hexversion >= 0x2050200:
               opts.numThreads = lit.util.detectCPUs()
       else:
               opts.numThreads = 1

    inputs = args

    # Create the user defined parameters.
    userParams = dict(builtinParameters)
    for entry in opts.userParameters:
        if '=' not in entry:
            name,val = entry,''
        else:
            name,val = entry.split('=', 1)
        userParams[name] = val

    # Create the global config object.
    litConfig = lit.LitConfig.LitConfig(
        progname = os.path.basename(sys.argv[0]),
        path = opts.path,
        quiet = opts.quiet,
        useValgrind = opts.useValgrind,
        valgrindLeakCheck = opts.valgrindLeakCheck,
        valgrindArgs = opts.valgrindArgs,
        noExecute = opts.noExecute,
        debug = opts.debug,
        isWindows = isWindows,
        params = userParams,
        config_prefix = opts.configPrefix)

    # Perform test discovery.
    run = lit.run.Run(litConfig,
                      lit.discovery.find_tests_for_inputs(litConfig, inputs))

    if opts.showSuites or opts.showTests:
        # Aggregate the tests by suite.
        suitesAndTests = {}
        for t in run.tests:
            if t.suite not in suitesAndTests:
                suitesAndTests[t.suite] = []
            suitesAndTests[t.suite].append(t)
        suitesAndTests = list(suitesAndTests.items())
        suitesAndTests.sort(key = lambda item: item[0].name)

        # Show the suites, if requested.
        if opts.showSuites:
            print('-- Test Suites --')
            for ts,ts_tests in suitesAndTests:
                print('  %s - %d tests' %(ts.name, len(ts_tests)))
                print('    Source Root: %s' % ts.source_root)
                print('    Exec Root  : %s' % ts.exec_root)

        # Show the tests, if requested.
        if opts.showTests:
            print('-- Available Tests --')
            for ts,ts_tests in suitesAndTests:
                ts_tests.sort(key = lambda test: test.path_in_suite)
                for test in ts_tests:
                    print('  %s' % (test.getFullName(),))

        # Exit.
        sys.exit(0)

    # Select and order the tests.
    numTotalTests = len(run.tests)

    # First, select based on the filter expression if given.
    if opts.filter:
        try:
            rex = re.compile(opts.filter)
        except:
            parser.error("invalid regular expression for --filter: %r" % (
                    opts.filter))
        run.tests = [t for t in run.tests
                     if rex.search(t.getFullName())]

    # Then select the order.
    if opts.shuffle:
        random.shuffle(run.tests)
    elif opts.incremental:
        sort_by_incremental_cache(run)
    else:
        run.tests.sort(key = lambda t: t.getFullName())

    # Finally limit the number of tests, if desired.
    if opts.maxTests is not None:
        run.tests = run.tests[:opts.maxTests]

    # Don't create more threads than tests.
    opts.numThreads = min(len(run.tests), opts.numThreads)

    extra = ''
    if len(run.tests) != numTotalTests:
        extra = ' of %d' % numTotalTests
    header = '-- Testing: %d%s tests, %d threads --'%(len(run.tests), extra,
                                                      opts.numThreads)

    progressBar = None
    if not opts.quiet:
        if opts.succinct and opts.useProgressBar:
            try:
                tc = lit.ProgressBar.TerminalController()
                progressBar = lit.ProgressBar.ProgressBar(tc, header)
            except ValueError:
                print(header)
                progressBar = lit.ProgressBar.SimpleProgressBar('Testing: ')
        else:
            print(header)

    startTime = time.time()
    display = TestingProgressDisplay(opts, len(run.tests), progressBar)
    try:
        run.execute_tests(display, opts.numThreads, opts.maxTime,
                          opts.useProcesses)
    except KeyboardInterrupt:
        sys.exit(2)
    display.finish()

    testing_time = time.time() - startTime
    if not opts.quiet:
        print('Testing Time: %.2fs' % (testing_time,))

    # Write out the test data, if requested.
    if opts.output_path is not None:
        write_test_results(run, litConfig, testing_time, opts.output_path)

    # List test results organized by kind.
    hasFailures = False
    byCode = {}
    for test in run.tests:
        if test.result.code not in byCode:
            byCode[test.result.code] = []
        byCode[test.result.code].append(test)
        if test.result.code.isFailure:
            hasFailures = True

    # Print each test in any of the failing groups.
    for title,code in (('Unexpected Passing Tests', lit.Test.XPASS),
                       ('Failing Tests', lit.Test.FAIL),
                       ('Unresolved Tests', lit.Test.UNRESOLVED)):
        elts = byCode.get(code)
        if not elts:
            continue
        print('*'*20)
        print('%s (%d):' % (title, len(elts)))
        for test in elts:
            print('    %s' % test.getFullName())
        sys.stdout.write('\n')

    if opts.timeTests and run.tests:
        # Order by time.
        test_times = [(test.getFullName(), test.result.elapsed)
                      for test in run.tests]
        lit.util.printHistogram(test_times, title='Tests')

    for name,code in (('Expected Passes    ', lit.Test.PASS),
                      ('Expected Failures  ', lit.Test.XFAIL),
                      ('Unsupported Tests  ', lit.Test.UNSUPPORTED),
                      ('Unresolved Tests   ', lit.Test.UNRESOLVED),
                      ('Unexpected Passes  ', lit.Test.XPASS),
                      ('Unexpected Failures', lit.Test.FAIL),):
        if opts.quiet and not code.isFailure:
            continue
        N = len(byCode.get(code,[]))
        if N:
            print('  %s: %d' % (name,N))

    # If we encountered any additional errors, exit abnormally.
    if litConfig.numErrors:
        sys.stderr.write('\n%d error(s), exiting.\n' % litConfig.numErrors)
        sys.exit(2)

    # Warn about warnings.
    if litConfig.numWarnings:
        sys.stderr.write('\n%d warning(s) in tests.\n' % litConfig.numWarnings)

    if hasFailures:
        sys.exit(1)
    sys.exit(0)

if __name__=='__main__':
    main()