[Swarming] Isolate deopt fuzzer.

tools/run-deopt-fuzzer.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 import time
 
 from testrunner.local import execution
 from testrunner.local import progress
 from testrunner.local import testsuite
 from testrunner.local import utils
 from testrunner.local import verbose
 from testrunner.objects import context
 
 
+# Base dir of the v8 checkout to be used as cwd.
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
 ARCH_GUESS = utils.DefaultArch()
 DEFAULT_TESTS = ["mjsunit", "webkit"]
 TIMEOUT_DEFAULT = 60
 TIMEOUT_SCALEFACTOR = {"debug"   : 4,
                        "release" : 1 }
 
 MODE_FLAGS = {
     "debug"   : ["--nohard-abort", "--nodead-code-elimination",
                  "--nofold-constants", "--enable-slow-asserts",
                  "--debug-code", "--verify-heap",
@@ skipping 222 matching lines @@
   count = 0
   shard = []
   for test in tests:
     if count % shard_count == shard_run - 1:
       shard.append(test)
     count += 1
   return shard
 
 
 def Main():
+  # Use the v8 root as cwd as some test cases use "load" with relative paths.
+  os.chdir(BASE_DIR)
+
   parser = BuildOptions()
   (options, args) = parser.parse_args()
   if not ProcessOptions(options):
     parser.print_help()
     return 1
 
   exit_code = 0
-  workspace = os.path.abspath(join(os.path.dirname(sys.argv[0]), ".."))
 
-  suite_paths = utils.GetSuitePaths(join(workspace, "test"))
+  suite_paths = utils.GetSuitePaths(join(BASE_DIR, "test"))
 
   if len(args) == 0:
     suite_paths = [ s for s in suite_paths if s in DEFAULT_TESTS ]
   else:
     args_suites = set()
     for arg in args:
       suite = arg.split(os.path.sep)[0]
       if not suite in args_suites:
         args_suites.add(suite)
     suite_paths = [ s for s in suite_paths if s in args_suites ]
 
   suites = []
   for root in suite_paths:
     suite = testsuite.TestSuite.LoadTestSuite(
-        os.path.join(workspace, "test", root))
+        os.path.join(BASE_DIR, "test", root))
     if suite:
       suite.SetupWorkingDirectory()
       suites.append(suite)
 
   if options.download_data:
     for s in suites:
       s.DownloadData()
 
   for mode in options.mode:
     for arch in options.arch:
       try:
-        code = Execute(arch, mode, args, options, suites, workspace)
+        code = Execute(arch, mode, args, options, suites, BASE_DIR)
         exit_code = exit_code or code
       except KeyboardInterrupt:
         return 2
   return exit_code
 
 
 def CalculateNTests(m, options):
   """Calculates the number of tests from m deopt points with exponential
   coverage.
   The coverage is expected to be between 0.0 and 1.0.
@@ skipping 142 matching lines @@
   print(">>> Deopt fuzzing phase (%d test cases)" % num_tests)
   progress_indicator = progress.PROGRESS_INDICATORS[options.progress]()
   runner = execution.Runner(suites, progress_indicator, ctx)
 
   code = runner.Run(options.j)
   return exit_code or code
 
 
 if __name__ == "__main__":
   sys.exit(Main())