Add DebugStackState to be used as a debugging VM in and IDE.

src/test/java/lua/debug/DebugStackStateTest.java

@@ -0,0 +1,51 @@
+package lua.debug;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import junit.framework.TestCase;
+import lua.io.Closure;
+import lua.io.LoadState;
+import lua.io.Proto;
+import lua.value.LValue;
+
+public class DebugStackStateTest extends TestCase {
+
+	public void testDebugStackState() throws InterruptedException, IOException {
+		String script = "/test6.luac";
+		
+		// set up the vm
+		final DebugStackState state = new DebugStackState();
+		InputStream is = getClass().getResourceAsStream( script );
+		Proto p = LoadState.undump(state, is, script);
+		
+		// create closure and execute
+		final Closure c = new Closure( state, p );
+
+		// suspend the vm right away
+		state.suspend();
+		
+		// start the call processing in its own thread
+		new Thread() {
+			public void run() {
+				try {
+					state.doCall( c, new LValue[0] );
+				} catch ( Exception e ) {
+					e.printStackTrace();
+				}
+			}
+		}.start();
+		
+		// step for 25 steps
+		for ( int i=0; i<10; i++ ) {
+			state.step();
+			Thread.sleep(1000);
+			System.out.println("--- callgraph="+state.callgraph() );
+			System.out.println("--- stack="+state.stack() );
+			System.out.println("--- variable(1,0)="+state.variable(1,0) );
+		}
+
+		// resume the vm
+		state.resume();		
+	}
+}