#!/usr/bin/env python

# ===--- Benchmark_DTrace.in ---------------------------------------------===//
#
#  This source file is part of the Swift.org open source project
#
#  Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
#  Licensed under Apache License v2.0 with Runtime Library Exception
#
#  See https://swift.org/LICENSE.txt for license information
#  See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
#
# ===---------------------------------------------------------------------===//

import argparse
import os
import subprocess
import sys

DRIVER_LIBRARY_PATH = "@PATH_TO_DRIVER_LIBRARY@"
sys.path.append(DRIVER_LIBRARY_PATH)
DTRACE_PATH = os.path.join(DRIVER_LIBRARY_PATH, 'swift_stats.d')

import perf_test_driver  # noqa (E402 module level import not at top of file)

# Regexes for the XFAIL_LIST. Matches against '([Onone|O|Ounchecked],TestName)'
XFAIL_LIST = [
]


class DTraceResult(perf_test_driver.Result):

    def __init__(self, name, status, output, csv_output):
        perf_test_driver.Result.__init__(
            self, name, status, output, XFAIL_LIST)
        self.csv_output = csv_output

    @classmethod
    def data_headers(cls):
        return [
            'Name', 'Result', 'strong_retain', 'strong_retain/iter',
            'strong_release', 'strong_release/iter']

    @classmethod
    def data_format(cls, max_test_len):
        non_name_headers = DTraceResult.data_headers()[1:]
        fmt = ('{:<%d}' % (max_test_len + 5)) + \
            ''.join(['{:<%d}' % (len(h) + 2) for h in non_name_headers])
        return fmt

    @classmethod
    def print_data_header(cls, max_test_len, csv_output):
        headers = cls.data_headers()
        if csv_output:
            print(','.join(headers))
            return
        print(cls.data_format(max_test_len).format(*headers))

    def print_data(self, max_test_len):
        result = [self.get_name(), self.get_result()] + map(str, self.output)
        if self.csv_output:
            print(','.join(result))
            return

        print(DTraceResult.data_format(max_test_len).format(*result))


class DTraceBenchmarkDriver(perf_test_driver.BenchmarkDriver):

    def __init__(self, binary, xfail_list, csv_output):
        perf_test_driver.BenchmarkDriver.__init__(
            self, binary, xfail_list,
            enable_parallel=False,
            opt_levels=['O'])
        self.csv_output = csv_output

    def print_data_header(self, max_test_len):
        DTraceResult.print_data_header(max_test_len, self.csv_output)

    def prepare_input(self, name):
        return {}

    def process_input(self, data):
        test_name = '({}_{})'.format(data['opt'], data['test_name'])
        print("Running {}...".format(test_name))
        sys.stdout.flush()

        def get_results_with_iters(iters):
            p = subprocess.Popen([
                'sudo', 'dtrace', '-s', DTRACE_PATH,
                '-c', '%s %s %s' % (data['path'], data['test_name'],
                                    '--num-iters=%d' % iters)
            ], stdout=subprocess.PIPE, stderr=open('/dev/null', 'w'))
            results = [x for x in p.communicate()[0].split("\n") if len(x) > 0]
            return [
                x.split(',')[1] for x in
                results[results.index('DTRACE RESULTS') + 1:]]
        iter_2_results = get_results_with_iters(2)
        iter_3_results = get_results_with_iters(3)

        results = []
        for x in zip(iter_2_results, iter_3_results):
            results.append(x[1])
            results.append(int(x[1]) - int(x[0]))

        return DTraceResult(test_name, 0, results, self.csv_output)

SWIFT_BIN_DIR = os.path.dirname(os.path.abspath(__file__))


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        '-filter',
        type=str,
        default=None,
        help='Filter out any test that does not match the given regex')
    parser.add_argument(
        '-csv',
        default=False,
        action='store_true',
        help="Emit csv output",
        dest='csv_output')
    return parser.parse_args()

if __name__ == "__main__":
    args = parse_args()
    g = DTraceBenchmarkDriver(SWIFT_BIN_DIR, XFAIL_LIST, args.csv_output)
    if g.run(args.filter):
        sys.exit(0)
    else:
        sys.exit(-1)