Detect VM crashes and update status file.

dart/frog/frog.py

 #!/usr/bin/env python
 # 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.
 
 """Command line wrapper to run the frog compiler under the Dart VM"""
 
 # TODO(jimhug): This is a temporary hack to enable running on the VM.  We need
 #   the ability to get command-line arguments, to return exit codes, and to
 #   communicate with spawned processes in the VM for this to go away.
@@ skipping 170 matching lines @@
     compiler_cmd.extend(options.vm_flags.split(' '))
   compiler_cmd.append('--new_gen_heap_size=64');
   compiler_cmd.append(join(HOME, 'frogc.dart'))
   compiler_cmd.extend(args)
   exit_code = execute(compiler_cmd)
   if exit_code:
     if options.verbose: print ("cmd exited with status %d" % exit_code)
     if cleanup: shutil.rmtree(workdir)
     if exit_code < 0:
       print("VM exited with signal %d" % (-exit_code))
+      # TODO(ahe): Using 253 to signal a crash to test.dart.
+      return 253
     return exit_code
 
   result = 0
   if not outfile_given:
     if not options.html:
       js_cmd = options.js_cmd
       result = execute(js_cmd.split(' ') + [outfile] + nodeArgs)
     else:
       f = open(outhtml, 'w')
       f.write(HTML)
       f.close()
       result = execute([browser, outhtml])
   else:
     print 'Compilation succeded. Code generated in: %s' % outfile
 
   if cleanup: shutil.rmtree(workdir)
   if result != 0:
     return 1
   return 0
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))