1 files changed, 82 insertions, 0 deletions
diff --git a/compiler/test/dotty/tools/vulpix/ChildMain.scala b/compiler/test/dotty/tools/vulpix/ChildMain.scala
new file mode 100644
index 000000000..30059a9c5
--- /dev/null
+++ b/compiler/test/dotty/tools/vulpix/ChildMain.scala
@@ -0,0 +1,82 @@
+package dotty.tools.vulpix
+
+import java.io.{
+  File => JFile,
+  InputStream, ObjectInputStream,
+  OutputStream, ObjectOutputStream,
+  ByteArrayOutputStream, PrintStream
+}
+import java.lang.reflect.InvocationTargetException
+
+import dotty.tools.vulpix.Statuses._
+
+object ChildMain {
+  val realStdin = System.in
+  val realStderr = System.err
+  val realStdout = System.out
+
+  private def runMain(dir: JFile): Status = {
+    def renderStackTrace(ex: Throwable): String =
+      ex.getStackTrace
+        .takeWhile(_.getMethodName != "invoke0")
+        .mkString("    ", "\n    ", "")
+
+    def resetOutDescriptors(): Unit = {
+      System.setOut(realStdout)
+      System.setErr(realStderr)
+    }
+
+    import java.net.{ URL, URLClassLoader }
+
+    val printStream = new ByteArrayOutputStream
+
+    try {
+      // Do classloading magic and running here:
+      val ucl = new URLClassLoader(Array(dir.toURI.toURL))
+      val cls = ucl.loadClass("Test")
+      val meth = cls.getMethod("main", classOf[Array[String]])
+
+      try {
+        val ps = new PrintStream(printStream)
+        System.setOut(ps)
+        System.setErr(ps)
+        Console.withOut(printStream) {
+          Console.withErr(printStream) {
+            // invoke main with "jvm" as arg
+            meth.invoke(null, Array("jvm"))
+          }
+        }
+        resetOutDescriptors()
+      } catch {
+        case t: Throwable =>
+          resetOutDescriptors()
+          throw t
+      }
+      new Success(printStream.toString("utf-8"))
+    }
+    catch {
+      case ex: NoSuchMethodException =>
+        val msg = s"test in '$dir' did not contain method: ${ex.getMessage}"
+        new Failure(msg, renderStackTrace(ex.getCause))
+
+      case ex: ClassNotFoundException =>
+        val msg = s"test in '$dir' did not contain class: ${ex.getMessage}"
+        new Failure(msg, renderStackTrace(ex.getCause))
+
+      case ex: InvocationTargetException =>
+        val msg = s"An exception ocurred when running main: ${ex.getCause}"
+        new Failure(msg, renderStackTrace(ex.getCause))
+    }
+  }
+
+  def main(args: Array[String]): Unit = {
+    val stdin = new ObjectInputStream(System.in);
+    val stdout = new ObjectOutputStream(System.out);
+
+    while (true) {
+      val dir = stdin.readObject().asInstanceOf[JFile]
+      stdout.writeObject(runMain(dir))
+      stdout.flush()
+    }
+  }
+}