Make a VM crash more obvious.

dart/tools/utils.py

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import os
 import platform
@@ skipping 246 matching lines @@
 class ToolError(Exception):
   """Deprecated exception, use Error instead."""
 
   def __init__(self, value):
     self.value = value
 
   def __str__(self):
     return repr(self.value)
 
 
+def IsCrashExitCode(exit_code):
+  if IsWindows():
+    return 0x80000000 & exit_code

[Emily Fortuna, 2012/03/22 20:40:48]

where's the x8000000 coming from?

[ahe, 2012/03/22 20:46:32]

I don't know. All I know is that this is in test.py that is running on all the
V8 build bots and it seems to work. See
http://code.google.com/p/v8/source/browse/branches/bleeding_edge/tools/test.p...

[Emily Fortuna, 2012/03/22 20:47:45]

Curious. Sgtm...

+  else:
+    return exit_code < 0
+
+
+def DiagnoseExitCode(exit_code, command):
+  if IsCrashExitCode(exit_code):
+    sys.stderr.write('Command: %s\nCRASHED with exit code %d (0x%x)\n' % (
+        ' '.join(command), exit_code, exit_code & 0xffffffff))
+
+
 if __name__ == "__main__":
   import sys
   Main(sys.argv)