fix: debugger concurrency issues

src/main/java/me/topchetoeu/jscript/repl/debug/DebugServer.java

@@ -159,8 +159,10 @@ public class DebugServer {
 	}
 
 	public void awaitConnection() throws InterruptedException {
+		synchronized (connNotifier) {
 			connNotifier.wait();
 		}
+	}
 
 	public void run(InetSocketAddress address) {
 		try {

src/main/java/me/topchetoeu/jscript/repl/debug/SimpleDebugger.java

@@ -1032,15 +1032,20 @@ public class SimpleDebugger implements Debugger {
 		}
 		mappings.put(body, map);
 	}
+	
+	private boolean instructionLock;
+	
 	@Override public boolean onInstruction(Environment env, Frame cf, Instruction instruction, Value returnVal, EngineException error, boolean caught) {
 		if (!enabled) return false;
+		if (instructionLock) return false;
+		instructionLock = true;
 
+		try {
 			boolean isBreakpointable;
 			Location loc;
 			DebugFrame frame;
 			BreakpointType bptType;
 	
-		synchronized (this) {
 			frame = getFrame(cf);
 	
 			var map = DebugContext.get(env).getMap(frame.frame.function);
@@ -1077,6 +1082,8 @@ public class SimpleDebugger implements Debugger {
 				instruction.params.length == 1 &&
 				instruction.get(0).equals("debug")
 			) pauseDebug(env, null);
+	
+			synchronized (this) {
 			}
 	
 			while (enabled) {
@@ -1121,6 +1128,10 @@ public class SimpleDebugger implements Debugger {
 
 			return false;
 		}
+		finally {
+			instructionLock = false;
+		}
+	}
 	@Override public synchronized void onFramePush(Environment env, Frame frame) {
 		var prevFrame = currFrame;
 		updateFrames(env, 0);