Print stack traces of tests timing out on Windows

tools/testing/dart/test_runner.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 1990 matching lines @@
               if (io.Platform.isLinux) {
                 executable = 'eu-stack';
                 arguments = ['-p ${process.pid}'];
               } else if (io.Platform.isMacOS) {
                 // Try to print stack traces of the timed out process.
                 // `sample` is a sampling profiler but we ask it sample for 1
                 // second with a 4 second delay between samples so that we only
                 // sample the threads once.
                 executable = '/usr/bin/sample';
                 arguments = ['${process.pid}', '1', '4000', '-mayDie'];
+              } else if (io.Platform.isWindows) {
+                executable = "cdb.exe";

[kustermann, 2017/02/02 13:59:23]

How do you ensure the correct version of cdb.exe is used?

We can modify PATH if we know where the two different versions are.

[Florian Schneider, 2017/02/02 18:22:02]

Yes, the correct version has to be in the PATH. I don't want to put any code to
find it here.

+                arguments = ['-p', '${process.pid}', '-c', '!uniqstack;qd'];
               }
 
               if (executable != null) {
                 try {
                   var result = await io.Process.run(executable, arguments);
                   diagnostics.addAll(result.stdout.split('\n'));
                   diagnostics.addAll(result.stderr.split('\n'));
                 } catch (error) {
                   diagnostics.add("Unable to capture stack traces: $error");
                 }
@@ skipping 1320 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }