2 files changed, 19 insertions, 1 deletions
diff --git a/src/main/scala/Chisel/testers/BasicTester.scala b/src/main/scala/Chisel/testers/BasicTester.scala
index 6807a30e..d3e9e7c8 100644
--- a/src/main/scala/Chisel/testers/BasicTester.scala
+++ b/src/main/scala/Chisel/testers/BasicTester.scala
@@ -24,4 +24,11 @@ class BasicTester extends Module {
       pushCommand(Stop(Node(clock), 0))
     }
   }
+
+  /** The finish method provides a hook that subclasses of BasicTester can use to
+    * alter a circuit after their constructor has been called.
+    * For example, a specialized tester subclassing BasicTester could override finish in order to
+    * add flow control logic for a decoupled io port of a device under test
+    */
+  def finish(): Unit = {}
 }
diff --git a/src/main/scala/Chisel/testers/TesterDriver.scala b/src/main/scala/Chisel/testers/TesterDriver.scala
index b25b160b..4547f48f 100644
--- a/src/main/scala/Chisel/testers/TesterDriver.scala
+++ b/src/main/scala/Chisel/testers/TesterDriver.scala
@@ -23,7 +23,7 @@ object TesterDriver extends BackendCompilationUtilities {
     * frontend, and which can be turned into executables with assertions. */
   def execute(t: () => BasicTester, additionalVResources: Seq[String] = Seq()): Boolean = {
     // Invoke the chisel compiler to get the circuit's IR
-    val circuit = Driver.elaborate(t)
+    val circuit = Driver.elaborate(finishWrapper(t))
 
     // Set up a bunch of file handlers based on a random temp filename,
     // plus the quirks of Verilator's naming conventions
@@ -55,4 +55,15 @@ object TesterDriver extends BackendCompilationUtilities {
       false
     }
   }
+  /**
+    * Calls the finish method of an BasicTester or a class that extends it.
+    * The finish method is a hook for code that augments the circuit built in the constructor.
+    */
+  def finishWrapper(test: () => BasicTester): () => BasicTester = {
+    () => {
+      val tester = test()
+      tester.finish()
+      tester
+    }
+  }
 }