#!/usr/bin/perl
# -*- Mode: Perl; tab-width: 4; indent-tabs-mode: nil; -*-
# vim: set ts=4 sw=4 et tw=80:
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is JavaScript Core Tests.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 1997-1999
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Robert Ginda <rginda@netscape.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

# Second cut at runtests.pl script originally by
# Christine Begle (cbegle@netscape.com)
# Branched 11/01/99

use strict;
use Getopt::Mixed "nextOption";
use File::Temp qw/ tempfile tempdir /;
use POSIX qw(sys_wait_h);

my $os_type = &get_os_type;
my $unixish = (($os_type ne "WIN") && ($os_type ne "MAC"));
my $path_sep = ($os_type eq "MAC") ? ":" : "/";
my $win_sep  = ($os_type eq "WIN")? &get_win_sep : "";
my $redirect_command = ($os_type ne "MAC") ? " 2>&1" : "";

# command line option defaults
my $opt_suite_path;
my $opt_trace = 0;
my $opt_classpath = "";
my $opt_rhino_opt = 0;
my $opt_rhino_ms = 0;
my @opt_engine_list;
my $opt_engine_type = "";
my $opt_engine_params = "";
my $opt_user_output_file = 0;
my $opt_output_file = "";
my @opt_test_list_files;
my @opt_neg_list_files;
my $opt_shell_path = "";
my $opt_java_path = "";
my $opt_bug_url = "https://bugzilla.mozilla.org/show_bug.cgi?id=";
my $opt_console_failures = 0;
my $opt_console_failures_line = 0;
my $opt_lxr_url = "http://lxr.mozilla.org/mozilla/source/js/tests/";
my $opt_exit_munge = ($os_type ne "MAC") ? 1 : 0;
my $opt_timeout = 3600;
my $opt_enable_narcissus = 0;
my $opt_narcissus_path = "";
my $opt_no_quit = 0; 

# command line option definition
my $options = "b=s bugurl>b c=s classpath>c e=s engine>e f=s file>f " .
  "h help>h i j=s javapath>j k confail>k K linefail>K l=s list>l " .
  "L=s neglist>L o=s opt>o p=s testpath>p s=s shellpath>s t trace>t " .
  "T=s timeout>T u=s lxrurl>u " .
  "x noexitmunge>x n:s narcissus>n " . 
  "Q noquitinthandler>Q";

if ($os_type eq "MAC") {
    $opt_suite_path = `directory`;
    $opt_suite_path =~ s/[\n\r]//g;
    $opt_suite_path .= ":";
} else {
    $opt_suite_path = "./";
}

&parse_args;

my $user_exit = 0;
my ($engine_command, $html, $failures_reported, $tests_completed,
    $exec_time_string); 
my @failed_tests;
my @test_list = &get_test_list;

if ($#test_list == -1) {
    die ("Nothing to test.\n");
}

if ($unixish && $opt_no_quit == 0) {
    # on unix, ^C pauses the tests, and gives the user a chance to quit but 
    # report on what has been done, to just quit, or to continue (the
    # interrupted test will still be skipped.)
    # windows doesn't handle the int handler they way we want it to,
    # so don't even pretend to let the user continue.
    $SIG{INT} = 'int_handler';
}

my $current_test;
my $current_test_pid;

&main;

#End.

sub main {
    my $start_time;

    while ($opt_engine_type = pop (@opt_engine_list)) {
        dd ("Testing engine '$opt_engine_type'");

        $engine_command = &get_engine_command;
        $html = "";
        @failed_tests = ();
        $failures_reported = 0;
        $tests_completed = 0;
        $start_time = time;


        &execute_tests (@test_list);

        my $exec_time = (time - $start_time);
        my $exec_hours = int($exec_time / 60 / 60);
        $exec_time -= $exec_hours * 60 * 60;
        my $exec_mins = int($exec_time / 60);
        $exec_time -= $exec_mins * 60;
        my $exec_secs = ($exec_time % 60);

        if ($exec_hours > 0) {
            $exec_time_string = "$exec_hours hours, $exec_mins minutes, " .
              "$exec_secs seconds";
        } elsif ($exec_mins > 0) {
            $exec_time_string = "$exec_mins minutes, $exec_secs seconds";
        } else {
            $exec_time_string = "$exec_secs seconds";
        }

        if (!$opt_user_output_file) {
            $opt_output_file = &get_tempfile_name;
        }

        &write_results;

    }
}

sub append_file_to_command {
    my ($command, $file) = @_;

    if ($opt_enable_narcissus == 1) {
        $command .= " -e 'evaluate(\"load(\\\"$file\\\")\")'"
    } else {
        $command .= " -f $file";
    }
}

sub execute_tests {
    my (@test_list) = @_;
    my ($test, $shell_command, $line, @output, $path);
    my ($last_suite, $last_test_dir);

    &status ("Executing " . ($#test_list + 1) . " test(s).");

    foreach $test (@test_list) {
        my ($suite, $test_dir, $test_file) = split($path_sep, $test);
        # *-n.js is a negative test, expect exit code 3 (runtime error)
        my $expected_exit = ($test =~ /\-n\.js$/) ? 3 : 0;
        my ($got_exit, $exit_signal);
        my $failure_lines;
        my $bug_number;
        my $status_lines;

        # Allow the test to declare multiple possible success exit codes.
        # This is useful in situations where the test fails if a 
        # crash occurs but passes if no crash occurs even if an 
        # out of memory error occurs.
        my @expected_exit_list = ($expected_exit);

        # user selected [Q]uit from ^C handler.
        if ($user_exit) {
            return;
        }

        $current_test = $test;

        # Append the shell.js files to the shell_command if they're there.
        # (only check for their existance if the suite or test_dir has changed
        # since the last time we looked.)
        if ($last_suite ne $suite || $last_test_dir ne $test_dir) {
            $shell_command = &xp_path($engine_command);

            $path = &xp_path($opt_suite_path . $suite . "/shell.js");
            if (-f $path) {
                $shell_command = &append_file_to_command($shell_command,
                                                         $path);
            }

            $path = &xp_path($opt_suite_path . $suite . "/" .
                             $test_dir . "/shell.js");
            if (-f $path) {
                $shell_command = &append_file_to_command($shell_command,
                                                         $path);
            }

            $last_suite = $suite;
            $last_test_dir = $test_dir;
        }
         
        $path = &xp_path($opt_suite_path . $test);
        my $command = &append_file_to_command($shell_command, $path);
        &dd ("executing: " . $command);

        my $jsout;
        (undef, $jsout) = tempfile();

        #XXX cloned from tinderbox. See sub kill_process
        my $pid = fork; # Fork a child process to run the test
        unless ($pid) {
            open STDOUT, ">$jsout";
            open STDERR, ">&STDOUT";
            select STDOUT; $| = 1; # make STDOUT unbuffered
            select STDERR; $| = 1; # make STDERR unbuffered
            exec $command;
            die "Could not exec $command";
        }

        $current_test_pid = $pid;

        my $timed_out = 0;
        my $dumped_core = 0;
        my $loop_count = 0;
        my $wait_pid = -1;

        eval 
        {
            local $SIG{ALRM} = sub { die "time out" };
            alarm $opt_timeout;
            $wait_pid = waitpid($pid, 0);
            alarm 0;
        };

        if ($@ and $@ =~ /time out/)
        {
            kill_process($pid);
            $timed_out = 1;
        }

        $current_test_pid = undef;

        if ($opt_exit_munge == 1) {
            # signal information in the lower 8 bits, exit code above that
            $got_exit = ($? >> 8);
            $exit_signal = ($? & 255);
        } else {
            # user says not to munge the exit code
            $got_exit = $?;
            $exit_signal = 0;
        }

        open (OUTPUT, "$jsout") or
           die "failed to open temporary file $jsout: $!\n";
        @output = <OUTPUT>;
        close (OUTPUT);
        unlink "$jsout";

        @output = grep (!/js\>/, @output);

        $failure_lines = "";
        $bug_number = "";
        $status_lines = "";

        foreach $line (@output) {

            # watch for testcase to proclaim what exit code it expects to
            # produce (0 by default)
            if ($line =~ /expect(ed)?\s*exit\s*code\s*\:?\s*(\d+)/i) {
                $expected_exit = $2;
                push @expected_exit_list, ($expected_exit);
                &dd ("Test case expects exit code $expected_exit");
            }

            # watch for failures
            if ($line =~ /failed!/i) {
                $failure_lines .= $line;
            }

            # and watch for bugnumbers
            # XXX This only allows 1 bugnumber per testfile, should be
            # XXX modified to allow for multiple.
            if ($line =~ /bugnumber\s*\:?\s*(.*)/i) {
                my $bugline = $1;
                $bugline =~ /(\d+)/;
                $bug_number = $1;
            }

            # and watch for status
            if ($line =~ /status/i) {
                $status_lines .= $line;
            }

        }

        if (!@output) {
            @output = ("Testcase produced no output!");
        }

        if ($timed_out) {
            # test was terminated due to timeout
            &report_failure ($test, "TIMED OUT ($opt_timeout seconds)\n");
        }
        elsif (index(join(',', @expected_exit_list), $got_exit) == -1 || 
               $exit_signal != 0) {
            # full testcase output dumped on mismatched exit codes,
            &report_failure ($test, "Expected exit code " .
                             "$expected_exit, got $got_exit\n" .
                             "Testcase terminated with signal $exit_signal\n" .
                             "Complete testcase output was:\n" .
                             join ("\n",@output), $bug_number);
        } elsif ($failure_lines) {
            # only offending lines if exit codes matched
            &report_failure ($test, "$status_lines\n".
                             "Failure messages were:\n$failure_lines",
                             $bug_number);
        }

        &dd ("exit code $got_exit, exit signal $exit_signal.");

        $tests_completed++;
    }
}

sub write_results {
    my ($list_name, $neglist_name);
    my $completion_date = localtime;
    my $failure_pct = int(($failures_reported / $tests_completed) * 10000) /
      100;
    &dd ("Writing output to $opt_output_file.");

    if ($#opt_test_list_files == -1) {
        $list_name = "All tests";
    } elsif ($#opt_test_list_files < 10) {
        $list_name = join (", ", @opt_test_list_files);
    } else {
        $list_name = "($#opt_test_list_files test files specified)";
    }

    if ($#opt_neg_list_files == -1) {
        $neglist_name = "(none)";
    } elsif ($#opt_test_list_files < 10) {
        $neglist_name = join (", ", @opt_neg_list_files);
    } else {
        $neglist_name = "($#opt_neg_list_files skip files specified)";
    }

    open (OUTPUT, "> $opt_output_file") ||
      die ("Could not create output file $opt_output_file");

    print OUTPUT 
      ("<html><head>\n" .
       "<title>Test results, $opt_engine_type</title>\n" .
       "</head>\n" .
       "<body bgcolor='white'>\n" .
       "<a name='tippy_top'></a>\n" .
       "<h2>Test results, $opt_engine_type</h2><br>\n" .
       "<p class='results_summary'>\n" .
       "Test List: $list_name<br>\n" .
       "Skip List: $neglist_name<br>\n" .
       ($#test_list + 1) . " test(s) selected, $tests_completed test(s) " .
       "completed, $failures_reported failures reported " .
       "($failure_pct% failed)<br>\n" .
       "Engine command line: $engine_command<br>\n" .
       "OS type: $os_type<br>\n");

    if ($opt_engine_type =~ /^rhino/) {
        open (JAVAOUTPUT, $opt_java_path . "java -fullversion " .
              $redirect_command . " |");
        print OUTPUT <JAVAOUTPUT>;
        print OUTPUT "<BR>";
        close (JAVAOUTPUT);
    }

    print OUTPUT 
      ("Testcase execution time: $exec_time_string.<br>\n" .
       "Tests completed on $completion_date.<br><br>\n");

    if ($failures_reported > 0) {
        my $output_file_failures = $opt_output_file;
        $output_file_failures =~ s/(.*)\.html$/$1-failures.txt/;
        open (OUTPUTFAILURES, "> $output_file_failures") ||
            die ("Could not create failure output file $output_file_failures");
        print OUTPUTFAILURES (join ("\n", @failed_tests));
        print OUTPUTFAILURES "\n";
        close OUTPUTFAILURES;

        &status ("Wrote failures to '$output_file_failures'.");

        print OUTPUT
          ("[ <a href='#fail_detail'>Failure Details</a> | " .
           "<a href='#retest_list'>Retest List</a> | " .
           "<a href='$opt_lxr_url" . "menu.html'>Test Selection Page</a> ]<br>\n" .
           "<hr>\n" .
           "<a name='fail_detail'></a>\n" .
           "<h2>Failure Details</h2><br>\n<dl>" .
           $html .
           "</dl>\n[ <a href='#tippy_top'>Top of Page</a> | " .
           "<a href='#fail_detail'>Top of Failures</a> ]<br>\n" .
           "<hr>\n" .
           "<a name='retest_list'></a>\n" .
           "<h2>Retest List</h2><br>\n" .
           "<pre>\n" .
           "# Retest List, $opt_engine_type, " .
           "generated $completion_date.\n" .
           "FAILURE: # Original test base was: $list_name.\n" .
           "FAILURE: # $tests_completed of " . ($#test_list + 1) .
           " test(s) were completed, " .
           "$failures_reported failures reported.\n" .
           "FAILURE: Engine command line: $engine_command<br>\n" .
           join ("\n", map { "FAILURE: $_" } @failed_tests) .
           "\n</pre>\n" .
           "[ <a href='#tippy_top'>Top of Page</a> | " .
           "<a href='#retest_list'>Top of Retest List</a> ]<br>\n");
    } else {
        print OUTPUT 
          ("<h1>Whoop-de-doo, nothing failed!</h1>\n");
    }

    print OUTPUT "</body>";

    close (OUTPUT);

    &status ("Wrote results to '$opt_output_file'.");

    if ($opt_console_failures) {
        &status ("$failures_reported test(s) failed");
    }

}

sub parse_args {
    my ($option, $value, $lastopt);

    &dd ("checking command line options.");

    Getopt::Mixed::init ($options);
    $Getopt::Mixed::order = $Getopt::Mixed::RETURN_IN_ORDER;

    while (($option, $value) = nextOption()) {

        if ($option eq "b") {
            &dd ("opt: setting bugurl to '$value'.");
            $opt_bug_url = $value;

        } elsif ($option eq "c") {
            &dd ("opt: setting classpath to '$value'.");
            $opt_classpath = $value;

        } elsif (($option eq "e") || (($option eq "") && ($lastopt eq "e"))) {
            &dd ("opt: adding engine $value.");
            push (@opt_engine_list, $value);

        } elsif ($option eq "f") {
            if (!$value) {
                die ("Output file cannot be null.\n");
            }
            &dd ("opt: setting output file to '$value'.");
            $opt_user_output_file = 1;
            $opt_output_file = $value;

        } elsif ($option eq "h") {
            &usage;

        } elsif ($option eq "j") {
            if (!($value =~ /[\/\\]$/)) {
                $value .= "/";
            }
            &dd ("opt: setting java path to '$value'.");
            $opt_java_path = $value;

        } elsif ($option eq "k") {
            &dd ("opt: displaying failures on console.");
            $opt_console_failures=1;

        } elsif ($option eq "K") {
            &dd ("opt: displaying failures on console as single line.");
            $opt_console_failures=1;
            $opt_console_failures_line=1;

        } elsif ($option eq "l" || (($option eq "") && ($lastopt eq "l"))) {
            $option = "l";
            &dd ("opt: adding test list '$value'.");
            push (@opt_test_list_files, $value);

        } elsif ($option eq "L" || (($option eq "") && ($lastopt eq "L"))) {
            $option = "L";
            &dd ("opt: adding negative list '$value'.");
            push (@opt_neg_list_files, $value);

        } elsif ($option eq "o") {
            $opt_engine_params = $value;
            &dd ("opt: setting engine params to '$opt_engine_params'.");

        } elsif ($option eq "p") {
            $opt_suite_path = $value;

            if ($os_type eq "MAC") {
                if (!($opt_suite_path =~ /\:$/)) {
                    $opt_suite_path .= ":";
                }
            } else {
                if (!($opt_suite_path =~ /[\/\\]$/)) {
                    $opt_suite_path .= "/";
                }
            }

            &dd ("opt: setting suite path to '$opt_suite_path'.");

        } elsif ($option eq "s") {
            $opt_shell_path = $value;
            &dd ("opt: setting shell path to '$opt_shell_path'.");

        } elsif ($option eq "t") {
            &dd ("opt: tracing output.  (console failures at no extra charge.)");
            $opt_console_failures = 1;
            $opt_trace = 1;

        } elsif ($option eq "u") {
            &dd ("opt: setting lxr url to '$value'.");
            $opt_lxr_url = $value;

        } elsif ($option eq "x") {
            &dd ("opt: turning off exit munging.");
            $opt_exit_munge = 0;

        } elsif ($option eq "T") {
            $opt_timeout = $value;
            &dd ("opt: setting timeout to $opt_timeout.");

        } elsif ($option eq "n") {
            &dd ("opt: enabling narcissus.");
            $opt_enable_narcissus = 1;
            if ($value) {
                $opt_narcissus_path = $value;
            }

        } elsif ($option eq "Q") {
            &dd ("opt: disabling interrupt handler.");
            $opt_no_quit = 1;

        } else {
            &dd ("opt: unknown option $option '$value'.");
            &usage;
        }

        $lastopt = $option;

    }

    Getopt::Mixed::cleanup();

    if ($#opt_engine_list == -1) {
        die "You must select a shell to test in.\n";
    }

}

#
# print the arguments that this script expects
#
sub usage {
    print STDERR 
      ("\nusage: $0 [<options>] \n" .
       "(-b|--bugurl)             Bugzilla URL.\n" .
       "                          (default is $opt_bug_url)\n" .
       "(-c|--classpath)          Classpath (Rhino only.)\n" .
       "(-e|--engine) <type> ...  Specify the type of engine(s) to test.\n" .
       "                          <type> is one or more of\n" .
       "                          (smopt|smdebug|lcopt|lcdebug|xpcshell|" .
       "rhino|rhinoi|rhinoms|rhinomsi|rhino9|rhinoms9).\n" .
       "(-f|--file) <file>        Redirect output to file named <file>.\n" .
       "                          (default is " .
       "results-<engine-type>-<date-stamp>.html)\n" .
       "(-h|--help)               Print this message.\n" .
       "(-j|--javapath)           Location of java executable.\n" .
       "(-k|--confail)            Log failures to console (also.)\n" . 
       "(-K|--linefail)           Log failures to console as single line (also.)\n" . 
       "(-l|--list) <file> ...    List of tests to execute.\n" . 
       "(-L|--neglist) <file> ... List of tests to skip.\n" . 
       "(-o|--opt) <options>      Options to pass to the JavaScript engine.\n" .
       "                          (Make sure to quote them!)\n" .
       "(-p|--testpath) <path>    Root of the test suite. (default is ./)\n" .
       "(-s|--shellpath) <path>   Location of JavaScript shell.\n" .
       "(-t|--trace)              Trace script execution.\n" .
       "(-T|--timeout) <seconds>  Time in seconds before the test is terminated.\n" .
       "                          (default is 3600).\n" .
       "(-u|--lxrurl) <url>       Complete URL to tests subdirectory on lxr.\n" .
       "                          (default is $opt_lxr_url)\n" .
       "(-x|--noexitmunge)        Don't do exit code munging (try this if it\n" .
       "                          seems like your exit codes are turning up\n" .
       "                          as exit signals.)\n" .
       "(-n|--narcissus)[=<path>] Run the test suite through Narcissus, run\n" .
       "                          through the given shell. The optional path\n".
       "                          is the path to Narcissus' js.js file.\n".
       "(-Q|--noquitinthandler)   Do not prompt user to Quit, Report or Continue\n".
       "                          in the event of a user interrupt.\n"
       );
    exit (1);

}

#
# get the shell command used to start the (either) engine
#
sub get_engine_command {

    my $retval;

    if ($opt_engine_type eq "rhino") {
        &dd ("getting rhino engine command.");
        $opt_rhino_opt = 0;
        $opt_rhino_ms = 0;
        $retval = &get_rhino_engine_command;
    } elsif ($opt_engine_type eq "rhinoi") {
        &dd ("getting rhinoi engine command.");
        $opt_rhino_opt = -1;
        $opt_rhino_ms = 0;
        $retval = &get_rhino_engine_command;
    } elsif ($opt_engine_type eq "rhino9") {
        &dd ("getting rhino engine command.");
        $opt_rhino_opt = 9;
        $opt_rhino_ms = 0;
        $retval = &get_rhino_engine_command;
    } elsif ($opt_engine_type eq "rhinoms") {
        &dd ("getting rhinoms engine command.");
        $opt_rhino_opt = 0;
        $opt_rhino_ms = 1;
        $retval = &get_rhino_engine_command;
    } elsif ($opt_engine_type eq "rhinomsi") {
        &dd ("getting rhinomsi engine command.");
        $opt_rhino_opt = -1;
        $opt_rhino_ms = 1;
        $retval = &get_rhino_engine_command;
    } elsif ($opt_engine_type eq "rhinoms9") {
        &dd ("getting rhinomsi engine command.");
        $opt_rhino_opt = 9;
        $opt_rhino_ms = 1;
        $retval = &get_rhino_engine_command;
    } elsif ($opt_engine_type eq "xpcshell") {
        &dd ("getting xpcshell engine command.");
        $retval = &get_xpc_engine_command;
    } elsif ($opt_engine_type =~ /^lc(opt|debug)$/) {
        &dd ("getting liveconnect engine command.");
        $retval = &get_lc_engine_command;   
    } elsif ($opt_engine_type =~ /^sm(opt|debug)$/) {
        &dd ("getting spidermonkey engine command.");
        $retval = &get_sm_engine_command;
    } elsif ($opt_engine_type =~ /^ep(opt|debug)$/) {
        &dd ("getting epimetheus engine command.");
        $retval = &get_ep_engine_command;
    } else {
        die ("Unknown engine type selected, '$opt_engine_type'.\n");
    }

    $retval .= " $opt_engine_params";

    if ($opt_enable_narcissus == 1) {
        my $narcissus_path = &get_narcissus_path;
        $retval .= " -f $narcissus_path";
    }

    &dd ("got '$retval'");

    return $retval;
}

#
# get the path to the Narcissus js.js file.
#
sub get_narcissus_path {
    my $retval;

    if ($opt_narcissus_path) {
        $retval = $opt_narcissus_path;
    } else {
        # For now, just assume that we're in js/tests.
        $retval = "../narcissus/js.js";
    }

    if (!-e $retval) {
        # XXX if it didn't exist, try something more fancy?
        die "Unable to find Narcissus' js.js at $retval";
    }

    return $retval;
}

#
# get the shell command used to run rhino
#
sub get_rhino_engine_command {
    my $retval = $opt_java_path . ($opt_rhino_ms ? "jview " : "java ");

    if ($opt_shell_path) {
        $opt_classpath = ($opt_classpath) ?
          $opt_classpath . ":" . $opt_shell_path :
            $opt_shell_path;
    }

    if ($opt_classpath) {
        $retval .= ($opt_rhino_ms ? "/cp:p" : "-classpath") . " $opt_classpath ";
    }

    $retval .= "org.mozilla.javascript.tools.shell.Main";

    if ($opt_rhino_opt) {
        $retval .= " -opt $opt_rhino_opt";
    }

    return $retval;

}

#
# get the shell command used to run xpcshell
#
sub get_xpc_engine_command {
    my $retval;
    my $m5_home = @ENV{"MOZILLA_FIVE_HOME"} ||
      die ("You must set MOZILLA_FIVE_HOME to use the xpcshell" ,
           (!$unixish) ? "." : ", also " .
           "setting LD_LIBRARY_PATH to the same directory may get rid of " .
           "any 'library not found' errors.\n");

    if (($unixish) && (!@ENV{"LD_LIBRARY_PATH"})) {
        print STDERR "-#- WARNING: LD_LIBRARY_PATH is not set, xpcshell may " .
          "not be able to find the required components.\n";
    }

    if (!($m5_home =~ /[\/\\]$/)) {
        $m5_home .= "/";
    }

    $retval = $m5_home . "xpcshell";

    if ($os_type eq "WIN") {
        $retval .= ".exe";
    }

    $retval = &xp_path($retval);

    if (($os_type ne "MAC") && !(-x $retval)) {
        # mac doesn't seem to deal with -x correctly
        die ($retval . " is not a valid executable on this system.\n");
    }

    return $retval;

}

#
# get the shell command used to run spidermonkey
#
sub get_sm_engine_command {
    my $retval;

    # Look for Makefile.ref style make first.
    # (On Windows, spidermonkey can be made by two makefiles, each putting the
    # executable in a diferent directory, under a different name.)

    if ($opt_shell_path) {
        # if the user provided a path to the shell, return that.
        $retval = $opt_shell_path;

    } else {

        if ($os_type eq "MAC") {
            $retval = $opt_suite_path . ":src:macbuild:JS";
        } else {
            $retval = $opt_suite_path . "../src/";
            opendir (SRC_DIR_FILES, $retval);
            my @src_dir_files = readdir(SRC_DIR_FILES);
            closedir (SRC_DIR_FILES);

            my ($dir, $object_dir);
            my $pattern = ($opt_engine_type eq "smdebug") ?
              'DBG.OBJ' : 'OPT.OBJ';

            # scan for the first directory matching
            # the pattern expected to hold this type (debug or opt) of engine
            foreach $dir (@src_dir_files) {
                if ($dir =~ $pattern) {
                    $object_dir = $dir;
                    last;
                }
            }

            if (!$object_dir && $os_type ne "WIN") {
                die ("Could not locate an object directory in $retval " .
                     "matching the pattern *$pattern.  Have you built the " .
                     "engine?\n");
            }

            if (!(-x $retval . $object_dir . "/js.exe") && ($os_type eq "WIN")) {
                # On windows, you can build with js.mak as well as Makefile.ref
                # (Can you say WTF boys and girls?  I knew you could.)
                # So, if the exe the would have been built by Makefile.ref isn't 
                # here, check for the js.mak version before dying.
                if ($opt_shell_path) {
                    $retval = $opt_shell_path;
                    if (!($retval =~ /[\/\\]$/)) {
                        $retval .= "/";
                    }
                } else {
                    if ($opt_engine_type eq "smopt") {
                        $retval = "../src/Release/";
                    } else {
                        $retval = "../src/Debug/";
                    }
                }

                $retval .= "jsshell.exe";

            } else {
                $retval .= $object_dir . "/js";
                if ($os_type eq "WIN") {
                    $retval .= ".exe";
                }
            }
        } # mac/ not mac

        $retval = &xp_path($retval);

    } # (user provided a path)


    if (($os_type ne "MAC") && !(-x $retval)) {
        # mac doesn't seem to deal with -x correctly
        die ($retval . " is not a valid executable on this system.\n");
    }

    return $retval;

}

#
# get the shell command used to run epimetheus
#
sub get_ep_engine_command {
    my $retval;

    if ($opt_shell_path) {
        # if the user provided a path to the shell, return that -
        $retval = $opt_shell_path;

    } else {
        my $dir;
        my $os;
        my $debug;
        my $opt;
        my $exe;

        $dir = $opt_suite_path . "../../js2/src/";

        if ($os_type eq "MAC") {
            #
            # On the Mac, the debug and opt builds lie in the same directory -
            #
            $os = "macbuild:";
            $debug = "";
            $opt = "";
            $exe = "JS2";
        } elsif ($os_type eq "WIN") {
            $os = "winbuild/Epimetheus/";
            $debug = "Debug/";
            $opt = "Release/";
            $exe = "Epimetheus.exe";
        } else {
            $os = "";
            $debug = "";
            $opt = "";    # <<<----- XXX THIS IS NOT RIGHT! CHANGE IT!
            $exe = "epimetheus";
        }


        if ($opt_engine_type eq "epdebug") {
            $retval = $dir . $os . $debug . $exe;
        } else {
            $retval = $dir . $os . $opt . $exe;
        }

        $retval = &xp_path($retval);

    }# (user provided a path)


    if (($os_type ne "MAC") && !(-x $retval)) {
        # mac doesn't seem to deal with -x correctly
        die ($retval . " is not a valid executable on this system.\n");
    }

    return $retval;
}

#
# get the shell command used to run the liveconnect shell
#
sub get_lc_engine_command {
    my $retval;

    if ($opt_shell_path) {
        $retval = $opt_shell_path;
    } else {
        if ($os_type eq "MAC") {
            die "Don't know how to run the lc shell on the mac yet.\n";
        } else {
            $retval = $opt_suite_path . "../src/liveconnect/";
            opendir (SRC_DIR_FILES, $retval);
            my @src_dir_files = readdir(SRC_DIR_FILES);
            closedir (SRC_DIR_FILES);

            my ($dir, $object_dir);
            my $pattern = ($opt_engine_type eq "lcdebug") ?
              'DBG.OBJ' : 'OPT.OBJ';

            foreach $dir (@src_dir_files) {
                if ($dir =~ $pattern) {
                    $object_dir = $dir;
                    last;
                }
            }

            if (!$object_dir) {
                die ("Could not locate an object directory in $retval " .
                     "matching the pattern *$pattern.  Have you built the " .
                     "engine?\n");
            }

            $retval .= $object_dir . "/";

            if ($os_type eq "WIN") {
                $retval .= "lcshell.exe";
            } else {
                $retval .= "lcshell";
            }
        } # mac/ not mac

        $retval = &xp_path($retval);

    } # (user provided a path)


    if (($os_type ne "MAC") && !(-x $retval)) {
        # mac doesn't seem to deal with -x correctly
        die ("$retval is not a valid executable on this system.\n");
    }

    return $retval;

}

sub get_os_type {

    if ("\n" eq "\015") {
        return "MAC";
    }

    my $uname = `uname -a`;

    if ($uname =~ /WIN/) {
        $uname = "WIN";
    } else {
        chop $uname;
    }

    &dd ("get_os_type returning '$uname'.");
    return $uname;

}

sub get_test_list {
    my @test_list;
    my @neg_list;

    if ($#opt_test_list_files > -1) {
        my $list_file;

        &dd ("getting test list from user specified source.");

        foreach $list_file (@opt_test_list_files) {
            push (@test_list, &expand_user_test_list($list_file));
        }
    } else {
        &dd ("no list file, groveling in '$opt_suite_path'.");

        @test_list = &get_default_test_list($opt_suite_path);
    }

    if ($#opt_neg_list_files > -1) {
        my $list_file;
        my $orig_size = $#test_list + 1;
        my $actually_skipped;

        &dd ("getting negative list from user specified source.");

        foreach $list_file (@opt_neg_list_files) {
            push (@neg_list, &expand_user_test_list($list_file));
        }

        @test_list = &subtract_arrays (\@test_list, \@neg_list);

        $actually_skipped = $orig_size - ($#test_list + 1);

        &dd ($actually_skipped . " of " . $orig_size .
             " tests will be skipped.");
        &dd ((($#neg_list + 1) - $actually_skipped) . " skip tests were " .
             "not actually part of the test list.");

    }


    # Don't run any shell.js files as tests; they are only utility files
    @test_list = grep (!/shell\.js$/, @test_list);

    # Don't run any browser.js files as tests; they are only utility files
    @test_list = grep (!/browser\.js$/, @test_list);

    # Don't run any jsref.js files as tests; they are only utility files
    @test_list = grep (!/jsref\.js$/, @test_list);

    return @test_list;

}

#
# reads $list_file, storing non-comment lines into an array.
# lines in the form suite_dir/[*] or suite_dir/test_dir/[*] are expanded
# to include all test files under the specified directory
#
sub expand_user_test_list {
    my ($list_file) = @_;
    my @retval = ();

    #
    # Trim off the leading path separator that begins relative paths on the Mac.
    # Each path will get concatenated with $opt_suite_path, which ends in one.
    #
    # Also note:
    #
    # We will call expand_test_list_entry(), which does pattern-matching on $list_file.
    # This will make the pattern-matching the same as it would be on Linux/Windows -
    #
    if ($os_type eq "MAC") {
        $list_file =~ s/^$path_sep//;
    }

    if ($list_file =~ /\.js$/ || -d $opt_suite_path . $list_file) {

        push (@retval, &expand_test_list_entry($list_file));

    } else {

        open (TESTLIST, $list_file) ||
          die("Error opening test list file '$list_file': $!\n");

        while (<TESTLIST>) {
            s/\r*\n*$//;
            if (!(/\s*\#/)) {
                # It's not a comment, so process it
                push (@retval, &expand_test_list_entry($_));
            }
        }

        close (TESTLIST);

    }

    return @retval;

}


#
# Currently expect all paths to be RELATIVE to the top-level tests directory.
# One day, this should be improved to allow absolute paths as well -
#
sub expand_test_list_entry {
    my ($entry) = @_;
    my @retval;

    if ($entry =~ /\.js$/) {
        # it's a regular entry, add it to the list
        if (-f $opt_suite_path . $entry) {
            push (@retval, $entry);
        } else {
            status ("testcase '$entry' not found.");
        }
    } elsif ($entry =~ /(.*$path_sep[^\*][^$path_sep]*)$path_sep?\*?$/) {
        # Entry is in the form suite_dir/test_dir[/*]
        # so iterate all tests under it
        my $suite_and_test_dir = $1;
        my @test_files = &get_js_files ($opt_suite_path . 
                                        $suite_and_test_dir);
        my $i;

        foreach $i (0 .. $#test_files) {
            $test_files[$i] = $suite_and_test_dir . $path_sep .
              $test_files[$i];
        }

        splice (@retval, $#retval + 1, 0, @test_files);

    } elsif ($entry =~ /([^\*][^$path_sep]*)$path_sep?\*?$/) {
        # Entry is in the form suite_dir[/*]
        # so iterate all test dirs and tests under it
        my $suite = $1;
        my @test_dirs = &get_subdirs ($opt_suite_path . $suite);
        my $test_dir;

        foreach $test_dir (@test_dirs) {
            my @test_files = &get_js_files ($opt_suite_path . $suite .
                                            $path_sep . $test_dir);
            my $i;

            foreach $i (0 .. $#test_files) {
                $test_files[$i] = $suite . $path_sep . $test_dir . $path_sep .
                  $test_files[$i];
            }

            splice (@retval, $#retval + 1, 0, @test_files);
        }

    } else {
        die ("Don't know what to do with list entry '$entry'.\n");
    }

    return @retval;

}

#
# Grovels through $suite_path, searching for *all* test files.  Used when the
# user doesn't supply a test list.
#
sub get_default_test_list {
    my ($suite_path) = @_;
    my @suite_list = &get_subdirs($suite_path);
    my $suite;
    my @retval;

    foreach $suite (@suite_list) {
        my @test_dir_list = get_subdirs ($suite_path . $suite);
        my $test_dir;

        foreach $test_dir (@test_dir_list) {
            my @test_list = get_js_files ($suite_path . $suite . $path_sep .
                                          $test_dir);
            my $test;

            foreach $test (@test_list) {
                $retval[$#retval + 1] = $suite . $path_sep . $test_dir .
                  $path_sep . $test;
            }
        }
    }

    return @retval;

}

#
# generate an output file name based on the date
#
sub get_tempfile_name {
    my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) =
      &get_padded_time (localtime);
    my $rv;

    if ($os_type ne "MAC") {
        $rv = "results-" . $year . "-" . $mon . "-" . $mday . "-" . $hour .
          $min . $sec . "-" . $opt_engine_type;
    } else {
        $rv = "res-" . $year . $mon . $mday . $hour . $min . $sec . "-" .
          $opt_engine_type
    }

    return $rv . ".html";
}

sub get_padded_time {
    my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = @_;

    $mon++;
    $mon = &zero_pad($mon);
    $year += 1900;
    $mday= &zero_pad($mday);
    $sec = &zero_pad($sec);
    $min = &zero_pad($min);
    $hour = &zero_pad($hour);

    return ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst);

}

sub zero_pad {
    my ($string) = @_;

    $string = ($string < 10) ? "0" . $string : $string;
    return $string;
}

sub subtract_arrays {
    my ($whole_ref, $part_ref) = @_;
    my @whole = @$whole_ref;
    my @part = @$part_ref;
    my $line;

    foreach $line (@part) {
        @whole = grep (!/$line/, @whole);
    }

    return @whole;

}

#
# Convert unix path to mac style.
#
sub unix_to_mac {
    my ($path) = @_;
    my @path_elements = split ("/", $path);
    my $rv = "";
    my $i;

    foreach $i (0 .. $#path_elements) {
        if ($path_elements[$i] eq ".") {
            if (!($rv =~ /\:$/)) {
                $rv .= ":";
            }
        } elsif ($path_elements[$i] eq "..") {
            if (!($rv =~ /\:$/)) {
                $rv .= "::";
            } else {
                $rv .= ":";
            }
        } elsif ($path_elements[$i] ne "") {
            $rv .= $path_elements[$i] . ":";
        }

    }

    $rv =~ s/\:$//;

    return $rv;
}

#
# Convert unix path to win style.
#
sub unix_to_win {
  my ($path) = @_;

  if ($path_sep ne $win_sep) {
      $path =~ s/$path_sep/$win_sep/g;
  }

  return $path;
}

#
# Windows shells require "/" or "\" as path separator.
# Find out the one used in the current Windows shell.
#
sub get_win_sep {
  my $path = $ENV{"PATH"} || $ENV{"Path"} || $ENV{"path"};
  $path =~ /\\|\//;
  return $&;
}

#
# Convert unix path to correct style based on platform.
#
sub xp_path {
    my ($path) = @_;

    if ($os_type eq "MAC") {
        return &unix_to_mac($path);
    } elsif($os_type eq "WIN") {
        return &unix_to_win($path);
    } else {
        return $path;
    }
}

#
# given a directory, return an array of all subdirectories
#
sub get_subdirs {
    my ($dir)  = @_;
    my @subdirs;

    if ($os_type ne "MAC") {
        if (!($dir =~ /\/$/)) {
            $dir = $dir . "/";
        }
    } else {
        if (!($dir =~ /\:$/)) {
            $dir = $dir . ":";
        }
    }
    opendir (DIR, $dir) || die ("couldn't open directory $dir: $!");
    my @testdir_contents = readdir(DIR);
    closedir(DIR);

    foreach (@testdir_contents) {
        if ((-d ($dir . $_)) && ($_ ne 'CVS') && ($_ ne '.') && ($_ ne '..')) {
            @subdirs[$#subdirs + 1] = $_;
        }
    }

    return @subdirs;
}

#
# given a directory, return an array of all the js files that are in it.
#
sub get_js_files {
    my ($test_subdir) = @_;
    my (@js_file_array, @subdir_files);

    opendir (TEST_SUBDIR, $test_subdir) || die ("couldn't open directory " .
                                                "$test_subdir: $!");
    @subdir_files = readdir(TEST_SUBDIR);
    closedir( TEST_SUBDIR );

    foreach (@subdir_files) {
        if ($_ =~ /\.js$/) {
            $js_file_array[$#js_file_array+1] = $_;
        }
    }

    return @js_file_array;
}

sub report_failure {
    my ($test, $message, $bug_number) = @_;
    my $bug_line = "";

    $failures_reported++;

    $message =~ s/\n+/\n/g;
    $test =~ s/\:/\//g;

    if ($opt_console_failures) {
        if ($opt_console_failures_line) {
            my $linemessage = $message;
            $linemessage =~ s/[\n\r]+/ /mg;
            $bug_number = "none" unless $bug_number;
            print STDERR ("test: $test bug: $bug_number result: FAILED " .
                          "type: shell " .
                          " description: $linemessage\n");
        } elsif($bug_number) {
            print STDERR ("*-* Testcase $test failed:\nBug Number $bug_number".
                          "\n$message\n");
        } else {
            print STDERR ("*-* Testcase $test failed:\n$message\n");
        }
    }

    $message =~ s/&/&amp;/g;
    $message =~ s/</&lt;/g;
    $message =~ s/>/&gt;/g;
    $message =~ s/\n/<br>\n/g;

    if ($bug_number) {
        my $bug_url = ($bug_number =~ /^\d+$/) ? "$opt_bug_url$bug_number" : $bug_number;
        $bug_line = "<a href='$bug_url' target='other_window'>".
                    "Bug Number $bug_number</a>";
    }

    if ($opt_lxr_url) {
        $test =~ /\/?([^\/]+\/[^\/]+\/[^\/]+)$/;
        $test = $1;
        $html .= "<dd><b>".
          "Testcase <a target='other_window' href='$opt_lxr_url$test'>$1</a> " .
            "failed</b> $bug_line<br>\n";
    } else {
        $html .= "<dd><b>".
          "Testcase $test failed</b> $bug_line<br>\n";
    }

    $html .= " [ ";

    $html .= "<a href='#tippy_top'>Top of Page</a> ]<br>\n" .
          "<tt>$message</tt><br>\n";

    @failed_tests[$#failed_tests + 1] = $test;

}

sub dd {

    if ($opt_trace) {
        print ("-*- ", @_ , "\n");
    }

}

sub status {

    print ("-#- ", @_ , "\n");

}

sub int_handler {
    my $resp;

    if ($current_test_pid)
    {
        print "User Interrupt: killing process $current_test_pid\n";
        kill_process($current_test_pid);
    }

    do {
        print STDERR ("\n*** User Break: Just [Q]uit, Quit and [R]eport, [C]ontinue ?");
        $resp = <STDIN>;
    } until ($resp =~ /[QqRrCc]/);

    if ($resp =~ /[Qq]/) {
        print ("User Exit.  No results were generated.\n");
        exit;
    } elsif ($resp =~ /[Rr]/) {
        $user_exit = 1;
    }

}

# XXX: These functions were pulled from 
# lxr.mozilla.org/mozilla/source/tools/tinderbox/build-seamonkey-util.pl
# need a general reusable library of routines for use in all test programs.

sub kill_process {
    my ($target_pid) = @_;
    my $start_time = time;

    # Try to kill and wait 10 seconds, then try a kill -9
    my $sig;
    for $sig ('TERM', 'KILL') {
        print "kill $sig $target_pid\n";
        kill $sig => $target_pid;
        my $interval_start = time;
        while (time - $interval_start < 10) {
            # the following will work with 'cygwin' perl on win32, but not 
            # with 'MSWin32' (ActiveState) perl
            my $pid = waitpid($target_pid, POSIX::WNOHANG());
            if (($pid == $target_pid and POSIX::WIFEXITED($?)) or $pid == -1) {
                my $secs = time - $start_time;
                $secs = $secs == 1 ? '1 second' : "$secs seconds";
                return;
            }
            sleep 1;
        }
    }
    die "Unable to kill process: $target_pid";
}