tools,test: show signal code when test crashes

On every platform but `Windows`. Also, print the crash information when
using the tap reporter.

PR-URL: #7859
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

tools/test.py

@@ -196,7 +196,7 @@ def Done(self):
         print failed.output.stdout.strip()
       print "Command: %s" % EscapeCommand(failed.command)
       if failed.HasCrashed():
-        print "--- CRASHED ---"
+        print "--- %s ---" % PrintCrashed(failed.output.exit_code)
       if failed.HasTimedOut():
         print "--- TIMEOUT ---"
     if len(self.failed) == 0:
@@ -285,6 +285,9 @@ def HasRun(self, output):
       logger.info(status_line)
       self._printDiagnostic("\n".join(output.diagnostic))
 
+      if output.HasCrashed():
+        self._printDiagnostic(PrintCrashed(output.output.exit_code))
+
       if output.HasTimedOut():
         self._printDiagnostic('TIMEOUT')
 
@@ -347,7 +350,7 @@ def HasRun(self, output):
         print self.templates['stderr'] % stderr
       print "Command: %s" % EscapeCommand(output.command)
       if output.HasCrashed():
-        print "--- CRASHED ---"
+        print "--- %s ---" % PrintCrashed(output.output.exit_code)
       if output.HasTimedOut():
         print "--- TIMEOUT ---"
 
@@ -1476,6 +1479,13 @@ def FormatTime(d):
   return time.strftime("%M:%S.", time.gmtime(d)) + ("%03i" % millis)
 
 
+def PrintCrashed(code):
+  if utils.IsWindows():
+    return "CRASHED"
+  else:
+    return "CRASHED (Signal: %d)" % -code
+
+
 def Main():
   parser = BuildOptions()
   (options, args) = parser.parse_args()