Merge pull request #6 from TopchetoEU/TopchetoEU/function-optimizations

Cache function bodies

.github/workflows/tagged-release.yml

@@ -14,6 +14,7 @@ jobs:
       - name: Clone repository
         uses: GuillaumeFalourd/clone-github-repo-action@main
         with:
+          branch: 'master' # fuck this political bullshitshit, took me an hour to fix this
           owner: 'TopchetoEU'
           repository: 'java-jscript'
       - name: "Build"

build.js

@@ -54,7 +54,7 @@ async function compileJava() {
             .replace('${AUTHOR}', conf.author)
         );
         const args = ['--release', '11', ];
-        if (argv[1] === 'debug') args.push('-g');
+        if (argv[2] === 'debug') args.push('-g');
         args.push('-d', 'dst/classes', 'Metadata.java');
     
         for await (const path of find('src', undefined, v => v.endsWith('.java') && !v.endsWith('Metadata.java'))) args.push(path);
@@ -69,7 +69,6 @@ async function compileJava() {
     try {
         try { await fs.rm('dst', { recursive: true }); } catch {}
         await copy('src', 'dst/classes', v => !v.endsWith('.java'));
-        await run('tsc', '-p', 'lib/tsconfig.json', '--outFile', 'dst/classes/me/topchetoeu/jscript/js/core.js'),
         await compileJava();
         await run('jar', '-c', '-f', 'dst/jscript.jar', '-e', 'me.topchetoeu.jscript.Main', '-C', 'dst/classes', '.');
     }

dead-code/debug/DebugServer.java

@@ -1,154 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.io.IOException;
-import java.net.InetSocketAddress;
-import java.net.ServerSocket;
-import java.net.Socket;
-import java.security.MessageDigest;
-import java.util.Base64;
-
-import me.topchetoeu.jscript.engine.Engine;
-import me.topchetoeu.jscript.engine.debug.WebSocketMessage.Type;
-import me.topchetoeu.jscript.engine.debug.handlers.DebuggerHandles;
-import me.topchetoeu.jscript.exceptions.SyntaxException;
-
-public class DebugServer {
-    public static String browserDisplayName = "jscript";
-    public static String targetName = "target";
-
-    public final Engine engine;
-
-    private static void send(Socket socket, String val) throws IOException {
-        Http.writeResponse(socket.getOutputStream(), 200, "OK", "application/json", val.getBytes());
-    }
-
-    // SILENCE JAVA
-    private MessageDigest getDigestInstance() {
-        try {
-            return MessageDigest.getInstance("sha1");
-        }
-        catch (Throwable a) { return null; }
-    }
-
-    private static Thread runAsync(Runnable func, String name) {
-        var res = new Thread(func);
-        res.setName(name);
-        res.start();
-        return res;
-    }
-
-    private void handle(WebSocket ws) throws InterruptedException, IOException {
-        WebSocketMessage raw;
-
-        while ((raw = ws.receive()) != null) {
-            if (raw.type != Type.Text) {
-                ws.send(new V8Error("Expected a text message."));
-                continue;
-            }
-
-            V8Message msg;
-
-            try {
-                msg = new V8Message(raw.textData());
-            }
-            catch (SyntaxException e) {
-                ws.send(new V8Error(e.getMessage()));
-                return;
-            }
-
-            switch (msg.name) {
-                case "Debugger.enable": DebuggerHandles.enable(msg, engine, ws); continue;
-                case "Debugger.disable": DebuggerHandles.disable(msg, engine, ws); continue;
-                case "Debugger.stepInto": DebuggerHandles.stepInto(msg, engine, ws); continue;
-            }
-        }
-    }
-    private void onWsConnect(HttpRequest req, Socket socket) throws IOException {
-        var key = req.headers.get("sec-websocket-key");
-
-        if (key == null) {
-            Http.writeResponse(
-                socket.getOutputStream(), 426, "Upgrade Required", "text/txt",
-                "Expected a WS upgrade".getBytes()
-            );
-            return;
-        }
-
-        var resKey = Base64.getEncoder().encodeToString(getDigestInstance().digest(
-            (key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").getBytes()
-        ));
-
-        Http.writeCode(socket.getOutputStream(), 101, "Switching Protocols");
-        Http.writeHeader(socket.getOutputStream(), "Connection", "Upgrade");
-        Http.writeHeader(socket.getOutputStream(), "Sec-WebSocket-Accept", resKey);
-        Http.writeLastHeader(socket.getOutputStream(), "Upgrade", "WebSocket");
-
-        var ws = new WebSocket(socket);
-
-        runAsync(() -> {
-            try {
-                handle(ws);
-            }
-            catch (InterruptedException e) { return; }
-            catch (IOException e) { e.printStackTrace(); }
-            finally { ws.close(); }
-        }, "Debug Server Message Reader");
-        runAsync(() -> {
-            try {
-                handle(ws);
-            }
-            catch (InterruptedException e) { return; }
-            catch (IOException e) { e.printStackTrace(); }
-            finally { ws.close(); }
-        }, "Debug Server Event Writer");
-    }
-
-    public void open(InetSocketAddress address) throws IOException {
-        ServerSocket server = new ServerSocket();
-        server.bind(address);
-
-        try {
-            while (true) {
-                var socket = server.accept();
-                var req = Http.readRequest(socket.getInputStream());
-
-                switch (req.path) {
-                    case "/json/version":
-                        send(socket, "{\"Browser\":\"" + browserDisplayName + "\",\"Protocol-Version\":\"1.2\"}");
-                        break;
-                    case "/json/list":
-                    case "/json":
-                        var addr = "ws://" + address.getHostString() + ":" + address.getPort() + "/devtools/page/" + targetName;
-                        send(socket, "{\"id\":\"" + browserDisplayName + "\",\"webSocketDebuggerUrl\":\"" + addr + "\"}");
-                        break;
-                    case "/json/new":
-                    case "/json/activate":
-                    case "/json/protocol":
-                    case "/json/close":
-                    case "/devtools/inspector.html":
-                        Http.writeResponse(
-                            socket.getOutputStream(),
-                            501, "Not Implemented", "text/txt",
-                            "This feature isn't (and won't be) implemented.".getBytes()
-                        );
-                        break;
-                    default:
-                        if (req.path.equals("/devtools/page/" + targetName)) onWsConnect(req, socket);
-                        else {
-                            Http.writeResponse(
-                                socket.getOutputStream(),
-                                404, "Not Found", "text/txt",
-                                "Not found :/".getBytes()
-                            );
-                        }
-                        break;
-                }
-            }
-        }
-        finally { server.close(); }
-    }
-
-    public DebugServer(Engine engine) {
-        this.engine = engine;
-    }
-}

dead-code/debug/DebugState.java

@@ -1,52 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.engine.BreakpointData;
-import me.topchetoeu.jscript.engine.DebugCommand;
-import me.topchetoeu.jscript.engine.frame.CodeFrame;
-import me.topchetoeu.jscript.events.Event;
-
-public class DebugState {
-    private boolean paused = false;
-
-    public final HashSet<Location> breakpoints = new HashSet<>();
-    public final List<CodeFrame> frames = new ArrayList<>();
-    public final Map<String, String> sources = new HashMap<>();
-
-    public final Event<BreakpointData> breakpointNotifier = new Event<>();
-    public final Event<DebugCommand> commandNotifier = new Event<>();
-    public final Event<String> sourceAdded = new Event<>();
-
-    public DebugState pushFrame(CodeFrame frame) {
-        frames.add(frame);
-        return this;
-    }
-    public DebugState popFrame() {
-        if (frames.size() > 0) frames.remove(frames.size() - 1);
-        return this;
-    }
-
-    public DebugCommand pause(BreakpointData data) throws InterruptedException {
-        paused = true;
-        breakpointNotifier.next(data);
-        return commandNotifier.toAwaitable().await();
-    }
-    public void resume(DebugCommand command) {
-        paused = false;
-        commandNotifier.next(command);
-    }
-
-    // public void addSource()?
-
-    public boolean paused() { return paused; }
-
-    public boolean isBreakpoint(Location loc) {
-        return breakpoints.contains(loc);
-    }
-}

dead-code/debug/Http.java

@@ -1,65 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.util.HashMap;
-import java.util.IllegalFormatException;
-
-// We dont need no http library
-public class Http {
-    public static void writeCode(OutputStream str, int code, String name) throws IOException {
-        str.write(("HTTP/1.1 " + code + " " + name + "\r\n").getBytes());
-    }
-    public static void writeHeader(OutputStream str, String name, String value) throws IOException {
-        str.write((name + ": " + value + "\r\n").getBytes());
-    }
-    public static void writeLastHeader(OutputStream str, String name, String value) throws IOException {
-        str.write((name + ": " + value + "\r\n").getBytes());
-        writeHeadersEnd(str);
-    }
-    public static void writeHeadersEnd(OutputStream str) throws IOException {
-        str.write("\n".getBytes());
-    }
-
-    public static void writeResponse(OutputStream str, int code, String name, String type, byte[] data) throws IOException {
-        writeCode(str, code, name);
-        writeHeader(str, "Content-Type", type);
-        writeLastHeader(str, "Content-Length", data.length + "");
-        str.write(data);
-        str.close();
-    }
-
-    public static HttpRequest readRequest(InputStream str) throws IOException {
-        var lines = new BufferedReader(new InputStreamReader(str));
-        var line = lines.readLine();
-        var i1 = line.indexOf(" ");
-        var i2 = line.lastIndexOf(" ");
-
-        var method = line.substring(0, i1).trim().toUpperCase();
-        var path = line.substring(i1 + 1, i2).trim();
-        var headers = new HashMap<String, String>();
-
-        while (!(line = lines.readLine()).isEmpty()) {
-            var i = line.indexOf(":");
-            if (i < 0) continue;
-            var name = line.substring(0, i).trim().toLowerCase();
-            var value = line.substring(i + 1).trim();
-
-            if (name.length() == 0) continue;
-            headers.put(name, value);
-        }
-
-        if (headers.containsKey("content-length")) {
-            try {
-                var i = Integer.parseInt(headers.get("content-length"));
-                str.skip(i);
-            }
-            catch (IllegalFormatException e) { /* ¯\_(ツ)_/¯ */ }
-        }
-
-        return new HttpRequest(method, path, headers);
-    }
-}

dead-code/debug/HttpRequest.java

@@ -1,16 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.util.Map;
-
-public class HttpRequest {
-    public final String method;
-    public final String path;
-    public final Map<String, String> headers;
-
-    public HttpRequest(String method, String path, Map<String, String> headers) {
-        this.method = method;
-        this.path = path;
-        this.headers = headers;
-    }
-}
-

dead-code/debug/V8Error.java

@@ -1,19 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import me.topchetoeu.jscript.json.JSON;
-import me.topchetoeu.jscript.json.JSONMap;
-
-public class V8Error {
-    public final String message;
-
-    public V8Error(String message) {
-        this.message = message;
-    }
-
-    @Override
-    public String toString() {
-        return JSON.stringify(new JSONMap().set("error", new JSONMap()
-            .set("message", message)
-        ));
-    }
-}

dead-code/debug/V8Event.java

@@ -1,22 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import me.topchetoeu.jscript.json.JSON;
-import me.topchetoeu.jscript.json.JSONMap;
-
-public class V8Event {
-    public final String name;
-    public final JSONMap params;
-
-    public V8Event(String name, JSONMap params) {
-        this.name = name;
-        this.params = params;
-    }
-
-    @Override
-    public String toString() {
-        return JSON.stringify(new JSONMap()
-            .set("method", name)
-            .set("params", params)
-        );
-    }
-}

dead-code/debug/V8Message.java

@@ -1,50 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.util.Map;
-
-import me.topchetoeu.jscript.json.JSON;
-import me.topchetoeu.jscript.json.JSONElement;
-import me.topchetoeu.jscript.json.JSONMap;
-
-public class V8Message {
-    public final String name;
-    public final int id;
-    public final JSONMap params;
-
-    public V8Message(String name, int id, Map<String, JSONElement> params) {
-        this.name = name;
-        this.params = new JSONMap(params);
-        this.id = id;
-    }
-    public V8Result respond(JSONMap result) {
-        return new V8Result(id, result);
-    }
-    public V8Result respond() {
-        return new V8Result(id, new JSONMap());
-    }
-
-    public V8Message(JSONMap raw) {
-        if (!raw.isNumber("id")) throw new IllegalArgumentException("Expected number property 'id'.");
-        if (!raw.isString("method")) throw new IllegalArgumentException("Expected string property 'method'.");
-
-        this.name = raw.string("method");
-        this.id = (int)raw.number("id");
-        this.params = raw.contains("params") ? raw.map("params") : new JSONMap();
-    }
-    public V8Message(String raw) {
-        this(JSON.parse("json", raw).map());
-    }
-
-    public JSONMap toMap() {
-        var res = new JSONMap();
-        return res;
-    }
-    @Override
-    public String toString() {
-        return JSON.stringify(new JSONMap()
-            .set("method", name)
-            .set("params", params)
-            .set("id", id)
-        );
-    }
-}

dead-code/debug/V8Result.java

@@ -1,22 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import me.topchetoeu.jscript.json.JSON;
-import me.topchetoeu.jscript.json.JSONMap;
-
-public class V8Result {
-    public final int id;
-    public final JSONMap result;
-
-    public V8Result(int id, JSONMap result) {
-        this.id = id;
-        this.result = result;
-    }
-
-    @Override
-    public String toString() {
-        return JSON.stringify(new JSONMap()
-            .set("id", id)
-            .set("result", result)
-        );
-    }
-}

dead-code/debug/WebSocket.java

@@ -1,185 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.net.Socket;
-
-import me.topchetoeu.jscript.engine.debug.WebSocketMessage.Type;
-
-public class WebSocket implements AutoCloseable {
-    public long maxLength = 2000000;
-
-    private Socket socket;
-    private boolean closed = false;
-
-    private OutputStream out() throws IOException {
-        return socket.getOutputStream();
-    }
-    private InputStream in() throws IOException {
-        return socket.getInputStream();
-    }
-
-    private long readLen(int byteLen) throws IOException {
-        long res = 0;
-
-        if (byteLen == 126) {
-            res |= in().read() << 8;
-            res |= in().read();
-            return res;
-        }
-        else if (byteLen == 127) {
-            res |= in().read() << 56;
-            res |= in().read() << 48;
-            res |= in().read() << 40;
-            res |= in().read() << 32;
-            res |= in().read() << 24;
-            res |= in().read() << 16;
-            res |= in().read() << 8;
-            res |= in().read();
-            return res;
-        }
-        else return byteLen;
-    }
-    private byte[] readMask(boolean has) throws IOException {
-        if (has) {
-            return new byte[] {
-                (byte)in().read(),
-                (byte)in().read(),
-                (byte)in().read(),
-                (byte)in().read()
-            };
-        }
-        else return new byte[4];
-    }
-
-    private void writeLength(long len) throws IOException {
-        if (len < 126) {
-            out().write((int)len);
-        }
-        else if (len < 0xFFFF) {
-            out().write(126);
-            out().write((int)(len >> 8) & 0xFF);
-            out().write((int)len & 0xFF);
-        }
-        else {
-            out().write(127);
-            out().write((int)(len >> 56) & 0xFF);
-            out().write((int)(len >> 48) & 0xFF);
-            out().write((int)(len >> 40) & 0xFF);
-            out().write((int)(len >> 32) & 0xFF);
-            out().write((int)(len >> 24) & 0xFF);
-            out().write((int)(len >> 16) & 0xFF);
-            out().write((int)(len >> 8) & 0xFF);
-            out().write((int)len & 0xFF);
-        }
-    }
-    private synchronized void write(int type, byte[] data) throws IOException {
-        out().write(type | 0x80);
-        writeLength(data.length);
-        for (int i = 0; i < data.length; i++) {
-            out().write(data[i]);
-        }
-    }
-
-    public void send(String data) throws IOException {
-        if (closed) throw new IllegalStateException("Object is closed.");
-        write(1, data.getBytes());
-    }
-    public void send(byte[] data) throws IOException {
-        if (closed) throw new IllegalStateException("Object is closed.");
-        write(2, data);
-    }
-    public void send(WebSocketMessage msg) throws IOException {
-        if (msg.type == Type.Binary) send(msg.binaryData());
-        else send(msg.textData());
-    }
-    public void send(Object data) throws IOException {
-        if (closed) throw new IllegalStateException("Object is closed.");
-        write(1, data.toString().getBytes());
-    }
-
-    public void close(String reason) {
-        if (socket != null) {
-            try { write(8, reason.getBytes()); } catch (IOException e) { /* ¯\_(ツ)_/¯ */ }
-            try { socket.close(); } catch (IOException e) { e.printStackTrace(); }
-        }
-
-        socket = null;
-        closed = true;
-    }
-    public void close() {
-        close("");
-    }
-
-    private WebSocketMessage fail(String reason) {
-        System.out.println("WebSocket Error: " + reason);
-        close(reason);
-        return null;
-    }
-
-    private byte[] readData() throws IOException {
-        var maskLen = in().read();
-        var hasMask = (maskLen & 0x80) != 0;
-        var len = (int)readLen(maskLen & 0x7F);
-        var mask = readMask(hasMask);
-
-        if (len > maxLength) fail("WebSocket Error: client exceeded configured max message size");
-        else {
-            var buff = new byte[len];
-
-            if (in().read(buff) < len) fail("WebSocket Error: payload too short");
-            else {
-                for (int i = 0; i < len; i++) {
-                    buff[i] ^= mask[(int)(i % 4)];
-                }
-                return buff;
-            }
-        }
-
-        return null;
-    }
-
-    public WebSocketMessage receive() throws InterruptedException {
-        try {
-            var data = new ByteArrayOutputStream();
-            var type = 0;
-
-            while (socket != null && !closed) {
-                var finId = in().read();
-                var fin = (finId & 0x80) != 0;
-                int id = finId & 0x0F;
-
-                if (id == 0x8) { close(); return null; }
-                if (id >= 0x8) {
-                    if (!fin) return fail("WebSocket Error: client-sent control frame was fragmented");
-                    if (id == 0x9) write(0xA, data.toByteArray());
-                    continue;
-                }
-
-                if (type == 0) type = id;
-                if (type == 0) return fail("WebSocket Error: client used opcode 0x00 for first fragment");
-
-                var buff = readData();
-                if (buff == null) break;
-
-                if (data.size() + buff.length > maxLength) return fail("WebSocket Error: client exceeded configured max message size");
-                data.write(buff);
-
-                if (!fin) continue;
-                var raw = data.toByteArray();
-
-                if (type == 1) return new WebSocketMessage(new String(raw));
-                else return new WebSocketMessage(raw);
-            }
-        }
-        catch (IOException e) { close(); }
-
-        return null;
-    }
-
-    public WebSocket(Socket socket) {
-        this.socket = socket;
-    }
-}

dead-code/debug/WebSocketMessage.java

@@ -1,29 +0,0 @@
-package me.topchetoeu.jscript.engine.debug;
-
-public class WebSocketMessage {
-    public static enum Type {
-        Text,
-        Binary,
-    }
-
-    public final Type type;
-    private final Object data;
-
-    public final String textData() {
-        if (type != Type.Text) throw new IllegalStateException("Message is not text.");
-        return (String)data;
-    }
-    public final byte[] binaryData() {
-        if (type != Type.Binary) throw new IllegalStateException("Message is not binary.");
-        return (byte[])data;
-    }
-
-    public WebSocketMessage(String data) {
-        this.type = Type.Text;
-        this.data = data;
-    }
-    public WebSocketMessage(byte[] data) {
-        this.type = Type.Binary;
-        this.data = data;
-    }
-}

dead-code/debug/handlers/DebuggerHandles.java

@@ -1,29 +0,0 @@
-package me.topchetoeu.jscript.engine.debug.handlers;
-
-import java.io.IOException;
-
-import me.topchetoeu.jscript.engine.DebugCommand;
-import me.topchetoeu.jscript.engine.Engine;
-import me.topchetoeu.jscript.engine.debug.V8Error;
-import me.topchetoeu.jscript.engine.debug.V8Message;
-import me.topchetoeu.jscript.engine.debug.WebSocket;
-import me.topchetoeu.jscript.json.JSONMap;
-
-public class DebuggerHandles {
-    public static void enable(V8Message msg, Engine engine, WebSocket ws) throws IOException {
-        if (engine.debugState == null) ws.send(new V8Error("Debugging is disabled for this engine."));
-        else ws.send(msg.respond(new JSONMap().set("debuggerId", 1)));
-    }
-    public static void disable(V8Message msg, Engine engine, WebSocket ws) throws IOException {
-        if (engine.debugState == null) ws.send(msg.respond());
-        else ws.send(new V8Error("Debugger may not be disabled."));
-    }
-    public static void stepInto(V8Message msg, Engine engine, WebSocket ws) throws IOException {
-        if (engine.debugState == null) ws.send(new V8Error("Debugging is disabled for this engine."));
-        else if (!engine.debugState.paused()) ws.send(new V8Error("Debugger is not paused."));
-        else {
-            engine.debugState.resume(DebugCommand.STEP_INTO);
-            ws.send(msg.respond());
-        }
-    }
-}

dead-code/modules/FileModuleProvider.java

@@ -1,50 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.nio.file.Path;
-
-import me.topchetoeu.jscript.polyfills.PolyfillEngine;
-
-public class FileModuleProvider implements ModuleProvider {
-    public File root;
-    public final boolean allowOutside;
-
-    private boolean checkInside(Path modFile) {
-        return modFile.toAbsolutePath().startsWith(root.toPath().toAbsolutePath());
-    }
-
-    @Override
-    public Module getModule(File cwd, String name) {
-        var realName = getRealName(cwd, name);
-        if (realName == null) return null;
-        var path = Path.of(realName + ".js").normalize();
-
-        try {
-            var res = PolyfillEngine.streamToString(new FileInputStream(path.toFile()));
-            return new Module(realName, path.toString(), res);
-        }
-        catch (IOException e) {
-            return null;
-        }
-    }
-    @Override
-    public String getRealName(File cwd, String name) {
-        var path = Path.of(".", Path.of(cwd.toString(), name).normalize().toString());
-        var fileName = path.getFileName().toString();
-        if (fileName == null) return null;
-        if (!fileName.equals("index") && path.toFile().isDirectory()) return getRealName(cwd, name + "/index");
-        path = Path.of(path.toString() + ".js");
-        if (!allowOutside && !checkInside(path)) return null;
-        if (!path.toFile().isFile() || !path.toFile().canRead()) return null;
-        var res = path.toString().replace('\\', '/');
-        var i = res.lastIndexOf('.');
-        return res.substring(0, i);
-    }
-
-    public FileModuleProvider(File root, boolean allowOutside) {
-        this.root = root.toPath().normalize().toFile();
-        this.allowOutside = allowOutside;
-    }
-}

dead-code/modules/Module.java

@@ -1,57 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-
-import me.topchetoeu.jscript.engine.CallContext;
-import me.topchetoeu.jscript.engine.CallContext.DataKey;
-import me.topchetoeu.jscript.engine.scope.Variable;
-import me.topchetoeu.jscript.engine.values.ObjectValue;
-import me.topchetoeu.jscript.interop.NativeGetter;
-import me.topchetoeu.jscript.interop.NativeSetter;
-
-public class Module {
-    public class ExportsVariable implements Variable {
-        @Override
-        public boolean readonly() { return false; }
-        @Override
-        public Object get(CallContext ctx) { return exports; }
-        @Override
-        public void set(CallContext ctx, Object val) { exports = val; }
-    }
-
-    public static DataKey<Module> KEY = new DataKey<>();
-
-    public final String filename;
-    public final String source;
-    public final String name;
-    private Object exports = new ObjectValue();
-    private boolean executing = false;
-
-    @NativeGetter("name")
-    public String name() { return name; }
-    @NativeGetter("exports")
-    public Object exports() { return exports; }
-    @NativeSetter("exports")
-    public void setExports(Object val) { exports = val; }
-
-    public void execute(CallContext ctx) throws InterruptedException {
-        if (executing) return;
-
-        executing = true;
-        var scope = ctx.engine().global().globalChild();
-        scope.define(null, "module", true, this);
-        scope.define("exports", new ExportsVariable());
-
-        var parent = new File(filename).getParentFile();
-        if (parent == null) parent = new File(".");
-
-        ctx.engine().compile(scope, filename, source).call(ctx.copy().setData(KEY, this), null);
-        executing = false;
-    }
-
-    public Module(String name, String filename, String source) {
-        this.name = name;
-        this.filename = filename;
-        this.source = source;
-    }
-}

dead-code/modules/ModuleManager.java

@@ -1,80 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-
-import me.topchetoeu.jscript.engine.CallContext;
-
-public class ModuleManager {
-    private final List<ModuleProvider> providers = new ArrayList<>();
-    private final HashMap<String, Module> cache = new HashMap<>();
-    public final FileModuleProvider files;
-
-    public void addProvider(ModuleProvider provider) {
-        this.providers.add(provider);
-    }
-
-    public boolean isCached(File cwd, String name) {
-        name = name.replace("\\", "/");
-
-        // Absolute paths are forbidden
-        if (name.startsWith("/")) return false;
-        // Look for files if we have a relative path
-        if (name.startsWith("../") || name.startsWith("./")) {
-            var realName = files.getRealName(cwd, name);
-            if (cache.containsKey(realName)) return true;
-            else return false;
-        }
-
-        for (var provider : providers) {
-            var realName = provider.getRealName(cwd, name);
-            if (realName == null) continue;
-            if (cache.containsKey(realName)) return true;
-        }
-
-        return false;
-    }
-    public Module tryLoad(CallContext ctx, String name) throws InterruptedException {
-        name = name.replace('\\', '/');
-
-        var pcwd = Path.of(".");
-
-        if (ctx.hasData(Module.KEY)) {
-            pcwd = Path.of(((Module)ctx.getData(Module.KEY)).filename).getParent();
-            if (pcwd == null) pcwd = Path.of(".");
-        }
-
-
-        var cwd = pcwd.toFile();
-
-        if (name.startsWith("/")) return null;
-        if (name.startsWith("../") || name.startsWith("./")) {
-            var realName = files.getRealName(cwd, name);
-            if (realName == null) return null;
-            if (cache.containsKey(realName)) return cache.get(realName);
-            var mod = files.getModule(cwd, name);
-            cache.put(mod.name(), mod);
-            mod.execute(ctx);
-            return mod;
-        }
-
-        for (var provider : providers) {
-            var realName = provider.getRealName(cwd, name);
-            if (realName == null) continue;
-            if (cache.containsKey(realName)) return cache.get(realName);
-            var mod = provider.getModule(cwd, name);
-            cache.put(mod.name(), mod);
-            mod.execute(ctx);
-            return mod;
-        }
-
-        return null;
-    }
-
-    public ModuleManager(File root) {
-        files = new FileModuleProvider(root, false);
-    }
-}

dead-code/modules/ModuleProvider.java

@@ -1,9 +0,0 @@
-package me.topchetoeu.jscript.engine.modules;
-
-import java.io.File;
-
-public interface ModuleProvider {
-    Module getModule(File cwd, String name);
-    String getRealName(File cwd, String name);
-    default boolean hasModule(File cwd, String name) { return getRealName(cwd, name) != null; }
-}

lib/core.ts

@@ -1,71 +0,0 @@
-interface Environment {
-    global: typeof globalThis & Record<string, any>;
-    proto(name: string): object;
-    setProto(name: string, val: object): void;
-}
-interface Internals {
-    markSpecial(...funcs: Function[]): void;
-    getEnv(func: Function): Environment | undefined;
-    setEnv<T>(func: T, env: Environment): T;
-    apply(func: Function, thisArg: any, args: any[]): any;
-    delay(timeout: number, callback: Function): () => void;
-    pushMessage(micro: boolean, func: Function, thisArg: any, args: any[]): void;
-
-    strlen(val: string): number;
-    char(val: string): number;
-    stringFromStrings(arr: string[]): string;
-    stringFromChars(arr: number[]): string;
-    symbol(name?: string): symbol;
-    symbolToString(sym: symbol): string;
-
-    isArray(obj: any): boolean;
-    generator(func: (_yield: <T>(val: T) => unknown) => (...args: any[]) => unknown): GeneratorFunction;
-    defineField(obj: object, key: any, val: any, writable: boolean, enumerable: boolean, configurable: boolean): boolean;
-    defineProp(obj: object, key: any, get: Function | undefined, set: Function | undefined, enumerable: boolean, configurable: boolean): boolean;
-    keys(obj: object, onlyString: boolean): any[];
-    ownProp(obj: any, key: string): PropertyDescriptor<any, any>;
-    ownPropKeys(obj: any): any[];
-    lock(obj: object, type: 'ext' | 'seal' | 'freeze'): void;
-    extensible(obj: object): boolean;
-
-    sort(arr: any[], comaprator: (a: any, b: any) => number): void;
-
-    constructor: {
-        log(...args: any[]): void;
-    }
-}
-
-var env: Environment = arguments[0], internals: Internals = arguments[1];
-globalThis.log = internals.constructor.log;
-
-try {
-    run('values/object');
-    run('values/symbol');
-    run('values/function');
-    run('values/errors');
-    run('values/string');
-    run('values/number');
-    run('values/boolean');
-    run('values/array');
-    run('promise');
-    run('map');
-    run('set');
-    run('regex');
-    run('timeout');
-
-    env.global.log = log;
-
-    log('Loaded polyfills!');
-}
-catch (e: any) {
-    let err = 'Uncaught error while loading polyfills: ';
-
-    if (typeof Error !== 'undefined' && e instanceof Error && e.toString !== {}.toString) err += e;
-    else if ('message' in e) {
-        if ('name' in e) err += e.name + ": " + e.message;
-        else err += 'Error: ' + e.message;
-    }
-    else err += e;
-
-    log(e);
-}

lib/map.ts

@@ -1,93 +0,0 @@
-define("map", () => {
-    const syms = { values: internals.symbol('Map.values') } as { readonly values: unique symbol };
-    const Object = env.global.Object;
-
-    class Map<KeyT, ValueT> {
-        [syms.values]: any = {};
-
-        public [env.global.Symbol.iterator](): IterableIterator<[KeyT, ValueT]> {
-            return this.entries();
-        }
-
-        public clear() {
-            this[syms.values] = {};
-        }
-        public delete(key: KeyT) {
-            if ((key as any) in this[syms.values]) {
-                delete this[syms.values];
-                return true;
-            }
-            else return false;
-        }
-
-        public entries(): IterableIterator<[KeyT, ValueT]> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: [ keys[i], this[syms.values][keys[i++]] ] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public keys(): IterableIterator<KeyT> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: keys[i] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public values(): IterableIterator<ValueT> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: this[syms.values][keys[i++]] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-
-        public get(key: KeyT) {
-            return this[syms.values][key];
-        }
-        public set(key: KeyT, val: ValueT) {
-            this[syms.values][key] = val;
-            return this;
-        }
-        public has(key: KeyT) {
-            return (key as any) in this[syms.values][key];
-        }
-
-        public get size() {
-            return internals.ownPropKeys(this[syms.values]).length;
-        }
-
-        public forEach(func: (key: KeyT, val: ValueT, map: Map<KeyT, ValueT>) => void, thisArg?: any) {
-            const keys = internals.ownPropKeys(this[syms.values]);
-
-            for (let i = 0; i < keys.length; i++) {
-                func(keys[i], this[syms.values][keys[i]], this);
-            }
-        }
-
-        public constructor(iterable: Iterable<[KeyT, ValueT]>) {
-            const it = iterable[env.global.Symbol.iterator]();
-
-            for (let el = it.next(); !el.done; el = it.next()) {
-                this[syms.values][el.value[0]] = el.value[1];
-            }
-        }
-    }
-
-    env.global.Map = Map;
-});

lib/modules.ts

@@ -1,13 +0,0 @@
-var { define, run } = (() => {
-    const modules: Record<string, Function> = {};
-
-    function define(name: string, func: Function) {
-        modules[name] = func;
-    }
-    function run(name: string) {
-        if (typeof modules[name] === 'function') return modules[name]();
-        else throw "The module '" + name + "' doesn't exist.";
-    }
-
-    return { define, run };
-})();

lib/promise.ts

@@ -1,203 +0,0 @@
-define("promise", () => {
-    const syms = {
-        callbacks: internals.symbol('Promise.callbacks'),
-        state: internals.symbol('Promise.state'),
-        value: internals.symbol('Promise.value'),
-        handled: internals.symbol('Promise.handled'),
-    } as {
-        readonly callbacks: unique symbol,
-        readonly state: unique symbol,
-        readonly value: unique symbol,
-        readonly handled: unique symbol,
-    }
-
-    type Callback<T> = [ PromiseFulfillFunc<T>, PromiseRejectFunc ];
-    enum State {
-        Pending,
-        Fulfilled,
-        Rejected,
-    }
-
-    function isAwaitable(val: unknown): val is Thenable<any> {
-        return (
-            typeof val === 'object' &&
-            val !== null &&
-            'then' in val &&
-            typeof val.then === 'function'
-        );
-    }
-    function resolve(promise: Promise<any>, v: any, state: State) {
-        if (promise[syms.state] === State.Pending) {
-            if (typeof v === 'object' && v !== null && 'then' in v && typeof v.then === 'function') {
-                v.then(
-                    (res: any) => resolve(promise, res, state),
-                    (res: any) => resolve(promise, res, State.Rejected)
-                );
-                return;
-            }
-            promise[syms.value] = v;
-            promise[syms.state] = state;
-
-            for (let i = 0; i < promise[syms.callbacks]!.length; i++) {
-                promise[syms.handled] = true;
-                promise[syms.callbacks]![i][state - 1](v);
-            }
-
-            promise[syms.callbacks] = undefined;
-
-            internals.pushMessage(true, internals.setEnv(() => {
-                if (!promise[syms.handled] && state === State.Rejected) {
-                    log('Uncaught (in promise) ' + promise[syms.value]);
-                }
-            }, env), undefined, []);
-        }
-    }
-
-    class Promise<T> {
-        public static isAwaitable(val: unknown): val is Thenable<any> {
-            return isAwaitable(val);
-        }
-
-        public static resolve<T>(val: T): Promise<Awaited<T>> {
-            return new Promise(res => res(val as any));
-        }
-        public static reject<T>(val: T): Promise<Awaited<T>> {
-            return new Promise((_, rej) => rej(val as any));
-        }
-
-        public static race<T>(vals: T[]): Promise<Awaited<T>> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.race is not variadic.');
-            return new Promise((res, rej) => {
-                for (let i = 0; i < vals.length; i++) {
-                    const val = vals[i];
-                    if (this.isAwaitable(val)) val.then(res, rej);
-                    else res(val as any);
-                }
-            });
-        }
-        public static any<T>(vals: T[]): Promise<Awaited<T>> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.any is not variadic.');
-            return new Promise((res, rej) => {
-                let n = 0;
-
-                for (let i = 0; i < vals.length; i++) {
-                    const val = vals[i];
-                    if (this.isAwaitable(val)) val.then(res, (err) => {
-                        n++;
-                        if (n === vals.length) throw Error('No promise resolved.');
-                    });
-                    else res(val as any);
-                }
-
-                if (vals.length === 0) throw Error('No promise resolved.');
-            });
-        }
-        public static all(vals: any[]): Promise<any[]> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.all is not variadic.');
-            return new Promise((res, rej) => {
-                const result: any[] = [];
-                let n = 0;
-
-                for (let i = 0; i < vals.length; i++) {
-                    const val = vals[i];
-                    if (this.isAwaitable(val)) val.then(
-                        val => {
-                            n++;
-                            result[i] = val;
-                            if (n === vals.length) res(result);
-                        },
-                        rej
-                    );
-                    else {
-                        n++;
-                        result[i] = val;
-                    }
-                }
-
-                if (vals.length === n) res(result);
-            });
-        }
-        public static allSettled(vals: any[]): Promise<any[]> {
-            if (typeof vals.length !== 'number') throw new TypeError('vals must be an array. Note that Promise.allSettled is not variadic.');
-            return new Promise((res, rej) => {
-                const result: any[] = [];
-                let n = 0;
-
-                for (let i = 0; i < vals.length; i++) {
-                    const value = vals[i];
-                    if (this.isAwaitable(value)) value.then(
-                        value => {
-                            n++;
-                            result[i] = { status: 'fulfilled', value };
-                            if (n === vals.length) res(result);
-                        },
-                        reason => {
-                            n++;
-                            result[i] = { status: 'rejected', reason };
-                            if (n === vals.length) res(result);
-                        },
-                    );
-                    else {
-                        n++;
-                        result[i] = { status: 'fulfilled', value };
-                    }
-                }
-
-                if (vals.length === n) res(result);
-            });
-        }
-
-        [syms.callbacks]?: Callback<T>[] = [];
-        [syms.handled] = false;
-        [syms.state] = State.Pending;
-        [syms.value]?: T | unknown;
-
-        public then(onFulfil?: PromiseFulfillFunc<T>, onReject?: PromiseRejectFunc) {
-            return new Promise((resolve, reject) => {
-                onFulfil ??= v => v;
-                onReject ??= v => v;
-
-                const callback = (func: (val: any) => any) => (v: any) => {
-                    try { resolve(func(v)); }
-                    catch (e) { reject(e); }
-                }
-                switch (this[syms.state]) {
-                    case State.Pending:
-                        this[syms.callbacks]![this[syms.callbacks]!.length] = [callback(onFulfil), callback(onReject)];
-                        break;
-                    case State.Fulfilled:
-                        this[syms.handled] = true;
-                        callback(onFulfil)(this[syms.value]);
-                        break;
-                    case State.Rejected:
-                        this[syms.handled] = true;
-                        callback(onReject)(this[syms.value]);
-                        break;
-                }
-            })
-        }
-        public catch(func: PromiseRejectFunc) {
-            return this.then(undefined, func);
-        }
-        public finally(func: () => void) {
-            return this.then(
-                v => {
-                    func();
-                    return v;
-                },
-                v => {
-                    func();
-                    throw v;
-                }
-            );
-        }
-
-        public constructor(func: PromiseFunc<T>) {
-            internals.pushMessage(true, func, undefined, [
-                ((v) => resolve(this, v, State.Fulfilled)) as PromiseFulfillFunc<T>,
-                ((err) => resolve(this, err, State.Rejected)) as PromiseRejectFunc
-            ]);
-        }
-    }
-    env.global.Promise = Promise as any;
-});

lib/regex.ts

@@ -1,143 +0,0 @@
-define("regex", () => {
-    // var RegExp = env.global.RegExp = env.internals.RegExp;
-
-    // setProps(RegExp.prototype as RegExp, env, {
-    //     [Symbol.typeName]: 'RegExp',
-    
-    //     test(val) {
-    //         return !!this.exec(val);
-    //     },
-    //     toString() {
-    //         return '/' + this.source + '/' + this.flags;
-    //     },
-    
-    //     [Symbol.match](target) {
-    //         if (this.global) {
-    //             const res: string[] = [];
-    //             let val;
-    //             while (val = this.exec(target)) {
-    //                 res.push(val[0]);
-    //             }
-    //             this.lastIndex = 0;
-    //             return res;
-    //         }
-    //         else {
-    //             const res = this.exec(target);
-    //             if (!this.sticky) this.lastIndex = 0;
-    //             return res;
-    //         }
-    //     },
-    //     [Symbol.matchAll](target) {
-    //         let pattern: RegExp | undefined = new this.constructor(this, this.flags + "g") as RegExp;
-    
-    //         return {
-    //             next: (): IteratorResult<RegExpResult, undefined> => {
-    //                 const val = pattern?.exec(target);
-    
-    //                 if (val === null || val === undefined) {
-    //                     pattern = undefined;
-    //                     return { done: true };
-    //                 }
-    //                 else return { value: val };
-    //             },
-    //             [Symbol.iterator]() { return this; }
-    //         }
-    //     },
-    //     [Symbol.split](target, limit, sensible) {
-    //         const pattern = new this.constructor(this, this.flags + "g") as RegExp;
-    //         let match: RegExpResult | null;
-    //         let lastEnd = 0;
-    //         const res: string[] = [];
-    
-    //         while ((match = pattern.exec(target)) !== null) {
-    //             let added: string[] = [];
-    
-    //             if (match.index >= target.length) break;
-    
-    //             if (match[0].length === 0) {
-    //                 added = [ target.substring(lastEnd, pattern.lastIndex), ];
-    //                 if (pattern.lastIndex < target.length) added.push(...match.slice(1));
-    //             }
-    //             else if (match.index - lastEnd > 0) {
-    //                 added = [ target.substring(lastEnd, match.index), ...match.slice(1) ];
-    //             }
-    //             else {
-    //                 for (let i = 1; i < match.length; i++) {
-    //                     res[res.length - match.length + i] = match[i];
-    //                 }
-    //             }
-    
-    //             if (sensible) {
-    //                 if (limit !== undefined && res.length + added.length >= limit) break;
-    //                 else res.push(...added);
-    //             }
-    //             else {
-    //                 for (let i = 0; i < added.length; i++) {
-    //                     if (limit !== undefined && res.length >= limit) return res;
-    //                     else res.push(added[i]);
-    //                 }
-    //             }
-    
-    //             lastEnd = pattern.lastIndex;
-    //         }
-    
-    //         if (lastEnd < target.length) {
-    //             res.push(target.substring(lastEnd));
-    //         }
-    
-    //         return res;
-    //     },
-    //     [Symbol.replace](target, replacement) {
-    //         const pattern = new this.constructor(this, this.flags + "d") as RegExp;
-    //         let match: RegExpResult | null;
-    //         let lastEnd = 0;
-    //         const res: string[] = [];
-    
-    //         // log(pattern.toString());
-    
-    //         while ((match = pattern.exec(target)) !== null) {
-    //             const indices = match.indices![0];
-    //             res.push(target.substring(lastEnd, indices[0]));
-    //             if (replacement instanceof Function) {
-    //                 res.push(replacement(target.substring(indices[0], indices[1]), ...match.slice(1), indices[0], target));
-    //             }
-    //             else {
-    //                 res.push(replacement);
-    //             }
-    //             lastEnd = indices[1];
-    //             if (!pattern.global) break;
-    //         }
-    
-    //         if (lastEnd < target.length) {
-    //             res.push(target.substring(lastEnd));
-    //         }
-    
-    //         return res.join('');
-    //     },
-    //     [Symbol.search](target, reverse, start) {
-    //         const pattern: RegExp | undefined = new this.constructor(this, this.flags + "g") as RegExp;
-    
-            
-    //         if (!reverse) {
-    //             pattern.lastIndex = (start as any) | 0;
-    //             const res = pattern.exec(target);
-    //             if (res) return res.index;
-    //             else return -1;
-    //         }
-    //         else {
-    //             start ??= target.length;
-    //             start |= 0;
-    //             let res: RegExpResult | null = null;
-    
-    //             while (true) {
-    //                 const tmp = pattern.exec(target);
-    //                 if (tmp === null || tmp.index > start) break;
-    //                 res = tmp;
-    //             }
-    
-    //             if (res && res.index <= start) return res.index;
-    //             else return -1;
-    //         }
-    //     },
-    // });
-});

lib/set.ts

@@ -1,81 +0,0 @@
-define("set", () => {
-    const syms = { values: internals.symbol('Map.values') } as { readonly values: unique symbol };
-    const Object = env.global.Object;
-
-    class Set<T> {
-        [syms.values]: any = {};
-
-        public [env.global.Symbol.iterator](): IterableIterator<[T, T]> {
-            return this.entries();
-        }
-
-        public clear() {
-            this[syms.values] = {};
-        }
-        public delete(key: T) {
-            if ((key as any) in this[syms.values]) {
-                delete this[syms.values];
-                return true;
-            }
-            else return false;
-        }
-
-        public entries(): IterableIterator<[T, T]> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: [ keys[i], keys[i] ] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public keys(): IterableIterator<T> {
-            const keys = internals.ownPropKeys(this[syms.values]);
-            let i = 0;
-
-            return {
-                next: () => {
-                    if (i >= keys.length) return { done: true };
-                    else return { done: false, value: keys[i] }
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            }
-        }
-        public values(): IterableIterator<T> {
-            return this.keys();
-        }
-
-        public add(val: T) {
-            this[syms.values][val] = undefined;
-            return this;
-        }
-        public has(key: T) {
-            return (key as any) in this[syms.values][key];
-        }
-
-        public get size() {
-            return internals.ownPropKeys(this[syms.values]).length;
-        }
-
-        public forEach(func: (key: T, val: T, map: Set<T>) => void, thisArg?: any) {
-            const keys = internals.ownPropKeys(this[syms.values]);
-
-            for (let i = 0; i < keys.length; i++) {
-                func(keys[i], this[syms.values][keys[i]], this);
-            }
-        }
-
-        public constructor(iterable: Iterable<T>) {
-            const it = iterable[env.global.Symbol.iterator]();
-
-            for (let el = it.next(); !el.done; el = it.next()) {
-                this[syms.values][el.value] = undefined;
-            }
-        }
-    }
-
-    env.global.Set = Set;
-});

lib/timeout.ts

@@ -1,38 +0,0 @@
-define("timeout", () => {
-    const timeouts: Record<number, () => void> = { };
-    const intervals: Record<number, () => void> = { };
-    let timeoutI = 0, intervalI = 0;
-
-    env.global.setTimeout = (func, delay, ...args) => {
-        if (typeof func !== 'function') throw new TypeError("func must be a function.");
-        delay = (delay ?? 0) - 0;
-        const cancelFunc = internals.delay(delay, () => internals.apply(func, undefined, args));
-        timeouts[++timeoutI] = cancelFunc;
-        return timeoutI;
-    };
-    env.global.setInterval = (func, delay, ...args) => {
-        if (typeof func !== 'function') throw new TypeError("func must be a function.");
-        delay = (delay ?? 0) - 0;
-
-        const i = ++intervalI;
-        intervals[i] = internals.delay(delay, callback);
-
-        return i;
-
-        function callback() {
-            internals.apply(func, undefined, args);
-            intervals[i] = internals.delay(delay!, callback);
-        }
-    };
-    
-    env.global.clearTimeout = (id) => {
-        const func = timeouts[id];
-        if (func) func();
-        timeouts[id] = undefined!;
-    };
-    env.global.clearInterval = (id) => {
-        const func = intervals[id];
-        if (func) func();
-        intervals[id] = undefined!;
-    };
-});

lib/tsconfig.json

@@ -1,34 +0,0 @@
-{
-    "files": [
-        "lib.d.ts",
-        "modules.ts",
-        "utils.ts",
-        "values/object.ts",
-        "values/symbol.ts",
-        "values/function.ts",
-        "values/errors.ts",
-        "values/string.ts",
-        "values/number.ts",
-        "values/boolean.ts",
-        "values/array.ts",
-        "promise.ts",
-        "map.ts",
-        "set.ts",
-        "regex.ts",
-        "timeout.ts",
-        "core.ts"
-    ],
-    "compilerOptions": {
-        "outFile": "../bin/me/topchetoeu/jscript/js/core.js",
-        // "declarationDir": "",
-        // "declarationDir": "bin/me/topchetoeu/jscript/dts",
-        "target": "ES5",
-        "lib": [],
-        "module": "None",
-        "stripInternal": true,
-        "downlevelIteration": true,
-        "esModuleInterop": true,
-        "forceConsistentCasingInFileNames": true,
-        "strict": true,
-    }
-}

lib/utils.ts

@@ -1,38 +0,0 @@
-function setProps<
-    TargetT extends object,
-    DescT extends {
-        [x in Exclude<keyof TargetT, 'constructor'> ]?: TargetT[x] extends ((...args: infer ArgsT) => infer RetT) ?
-            ((this: TargetT, ...args: ArgsT) => RetT) :
-            TargetT[x]
-    }
->(target: TargetT, desc: DescT) {
-    var props = internals.keys(desc, false);
-    for (var i = 0; i < props.length; i++) {
-        var key = props[i];
-        internals.defineField(
-            target, key, (desc as any)[key],
-            true, // writable
-            false, // enumerable
-            true // configurable
-        );
-    }
-}
-function setConstr(target: object, constr: Function) {
-    internals.defineField(
-        target, 'constructor', constr,
-        true, // writable
-        false, // enumerable
-        true // configurable
-    );
-}
-
-function wrapI(max: number, i: number) {
-    i |= 0;
-    if (i < 0) i = max + i;
-    return i;
-}
-function clampI(max: number, i: number) {
-    if (i < 0) i = 0;
-    if (i > max) i = max;
-    return i;
-}

lib/values/array.ts

@@ -1,336 +0,0 @@
-define("values/array", () => {
-    var Array = env.global.Array = function(len?: number) {
-        var res = [];
-
-        if (typeof len === 'number' && arguments.length === 1) {
-            if (len < 0) throw 'Invalid array length.';
-            res.length = len;
-        }
-        else {
-            for (var i = 0; i < arguments.length; i++) {
-                res[i] = arguments[i];
-            }
-        }
-
-        return res;
-    } as ArrayConstructor;
-
-    env.setProto('array', Array.prototype);
-    (Array.prototype as any)[env.global.Symbol.typeName] = "Array";
-    setConstr(Array.prototype, Array);
-
-    setProps(Array.prototype, {
-        [env.global.Symbol.iterator]: function() {
-            return this.values();
-        },
-        [env.global.Symbol.typeName]: "Array",
-
-        values() {
-            var i = 0;
-    
-            return {
-                next: () => {
-                    while (i < this.length) {
-                        if (i++ in this) return { done: false, value: this[i - 1] };
-                    }
-                    return { done: true, value: undefined };
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            };
-        },
-        keys() {
-            var i = 0;
-    
-            return {
-                next: () => {
-                    while (i < this.length) {
-                        if (i++ in this) return { done: false, value: i - 1 };
-                    }
-                    return { done: true, value: undefined };
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            };
-        },
-        entries() {
-            var i = 0;
-    
-            return {
-                next: () => {
-                    while (i < this.length) {
-                        if (i++ in this) return { done: false, value: [i - 1, this[i - 1]] };
-                    }
-                    return { done: true, value: undefined };
-                },
-                [env.global.Symbol.iterator]() { return this; }
-            };
-        },
-        concat() {
-            var res = [] as any[];
-            res.push.apply(res, this);
-
-            for (var i = 0; i < arguments.length; i++) {
-                var arg = arguments[i];
-                if (arg instanceof Array) {
-                    res.push.apply(res, arg);
-                }
-                else {
-                    res.push(arg);
-                }
-            }
-    
-            return res;
-        },
-        every(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument not a function.");
-            func = func.bind(thisArg);
-    
-            for (var i = 0; i < this.length; i++) {
-                if (!func(this[i], i, this)) return false;
-            }
-    
-            return true;
-        },
-        some(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument not a function.");
-            func = func.bind(thisArg);
-    
-            for (var i = 0; i < this.length; i++) {
-                if (func(this[i], i, this)) return true;
-            }
-    
-            return false;
-        },
-        fill(val, start, end) {
-            if (arguments.length < 3) end = this.length;
-            if (arguments.length < 2) start = 0;
-    
-            start = clampI(this.length, wrapI(this.length + 1, start ?? 0));
-            end = clampI(this.length, wrapI(this.length + 1, end ?? this.length));
-    
-            for (; start < end; start++) {
-                this[start] = val;
-            }
-    
-            return this;
-        },
-        filter(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-    
-            var res = [];
-            for (var i = 0; i < this.length; i++) {
-                if (i in this && func.call(thisArg, this[i], i, this)) res.push(this[i]);
-            }
-            return res;
-        },
-        find(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-    
-            for (var i = 0; i < this.length; i++) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return this[i];
-            }
-    
-            return undefined;
-        },
-        findIndex(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-    
-            for (var i = 0; i < this.length; i++) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return i;
-            }
-    
-            return -1;
-        },
-        findLast(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-        
-            for (var i = this.length - 1; i >= 0; i--) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return this[i];
-            }
-        
-            return undefined;
-        },
-        findLastIndex(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-        
-            for (var i = this.length - 1; i >= 0; i--) {
-                if (i in this && func.call(thisArg, this[i], i, this)) return i;
-            }
-        
-            return -1;
-        },
-        flat(depth) {
-            var res = [] as any[];
-            var buff = [];
-            res.push(...this);
-        
-            for (var i = 0; i < (depth ?? 1); i++) {
-                var anyArrays = false;
-                for (var el of res) {
-                    if (el instanceof Array) {
-                        buff.push(...el);
-                        anyArrays = true;
-                    }
-                    else buff.push(el);
-                }
-        
-                res = buff;
-                buff = [];
-                if (!anyArrays) break;
-            }
-        
-            return res;
-        },
-        flatMap(func, th) {
-            return this.map(func, th).flat();
-        },
-        forEach(func, thisArg) {
-            for (var i = 0; i < this.length; i++) {
-                if (i in this) func.call(thisArg, this[i], i, this);
-            }
-        },
-        map(func, thisArg) {
-            if (typeof func !== 'function') throw new TypeError("Given argument is not a function.");
-        
-            var res = [];
-            for (var i = 0; i < this.length; i++) {
-                if (i in this) res[i] = func.call(thisArg, this[i], i, this);
-            }
-            return res;
-        },
-        pop() {
-            if (this.length === 0) return undefined;
-            var val = this[this.length - 1];
-            this.length--;
-            return val;
-        },
-        push() {
-            for (var i = 0; i < arguments.length; i++) {
-                this[this.length] = arguments[i];
-            }
-            return arguments.length;
-        },
-        shift() {
-            if (this.length === 0) return undefined;
-            var res = this[0];
-    
-            for (var i = 0; i < this.length - 1; i++) {
-                this[i] = this[i + 1];
-            }
-    
-            this.length--;
-    
-            return res;
-        },
-        unshift() {
-            for (var i = this.length - 1; i >= 0; i--) {
-                this[i + arguments.length] = this[i];
-            }
-            for (var i = 0; i < arguments.length; i++) {
-                this[i] = arguments[i];
-            }
-    
-            return arguments.length;
-        },
-        slice(start, end) {
-            start = clampI(this.length, wrapI(this.length + 1, start ?? 0));
-            end = clampI(this.length, wrapI(this.length + 1, end ?? this.length));
-    
-            var res: any[] = [];
-            var n = end - start;
-            if (n <= 0) return res;
-        
-            for (var i = 0; i < n; i++) {
-                res[i] = this[start + i];
-            }
-        
-            return res;
-        },
-        toString() {
-            let res = '';
-            for (let i = 0; i < this.length; i++) {
-                if (i > 0) res += ',';
-                if (i in this && this[i] !== undefined && this[i] !== null) res += this[i];
-            }
-        
-            return res;
-        },
-        indexOf(el, start) {
-            start = start! | 0;
-            for (var i = Math.max(0, start); i < this.length; i++) {
-                if (i in this && this[i] == el) return i;
-            }
-        
-            return -1;
-        },
-        lastIndexOf(el, start) {
-            start = start! | 0;
-            for (var i = this.length; i >= start; i--) {
-                if (i in this && this[i] == el) return i;
-            }
-    
-            return -1;
-        },
-        includes(el, start) {
-            return this.indexOf(el, start) >= 0;
-        },
-        join(val = ',') {
-            let res = '', first = true;
-    
-            for (let i = 0; i < this.length; i++) {
-                if (!(i in this)) continue;
-                if (!first) res += val;
-                first = false;
-                res += this[i];
-            }
-            return res;
-        },
-        sort(func) {
-            func ??= (a, b) => {
-                const _a = a + '';
-                const _b = b + '';
-    
-                if (_a > _b) return 1;
-                if (_a < _b) return -1;
-                return 0;
-            };
-    
-            if (typeof func !== 'function') throw new TypeError('Expected func to be undefined or a function.');
-    
-            internals.sort(this, func);
-            return this;
-        },
-        splice(start, deleteCount, ...items) {
-            start = clampI(this.length, wrapI(this.length, start ?? 0));
-            deleteCount = (deleteCount ?? Infinity | 0);
-            if (start + deleteCount >= this.length) deleteCount = this.length - start;
-    
-            const res = this.slice(start, start + deleteCount);
-            const moveN = items.length - deleteCount;
-            const len = this.length;
-    
-            if (moveN < 0) {
-                for (let i = start - moveN; i < len; i++) {
-                    this[i + moveN] = this[i];
-                }
-            }
-            else if (moveN > 0) {
-                for (let i = len - 1; i >= start; i--) {
-                    this[i + moveN] = this[i];
-                }
-            }
-    
-            for (let i = 0; i < items.length; i++) {
-                this[i + start] = items[i];
-            }
-    
-            this.length = len + moveN;
-    
-            return res;
-        }
-    });
-
-    setProps(Array, {
-        isArray(val: any) { return internals.isArray(val); }
-    });
-    internals.markSpecial(Array);
-});

lib/values/boolean.ts

@@ -1,12 +0,0 @@
-define("values/boolean", () => {
-    var Boolean = env.global.Boolean = function (this: Boolean | undefined, arg) {
-        var val;
-        if (arguments.length === 0) val = false;
-        else val = !!arg;
-        if (this === undefined || this === null) return val;
-        else (this as any).value = val;
-    } as BooleanConstructor;
-    
-    env.setProto('bool', Boolean.prototype);
-    setConstr(Boolean.prototype, Boolean);
-});

lib/values/errors.ts

@@ -1,46 +0,0 @@
-define("values/errors", () => {
-    var Error = env.global.Error = function Error(msg: string) {
-        if (msg === undefined) msg = '';
-        else msg += '';
-    
-        return Object.setPrototypeOf({
-            message: msg,
-            stack: [] as string[],
-        }, Error.prototype);
-    } as ErrorConstructor;
-
-    setConstr(Error.prototype, Error);
-    setProps(Error.prototype, {
-        name: 'Error',
-        toString: internals.setEnv(function(this: Error) {
-            if (!(this instanceof Error)) return '';
-        
-            if (this.message === '') return this.name;
-            else return this.name + ': ' + this.message;
-        }, env)
-    });
-    env.setProto('error', Error.prototype);
-    internals.markSpecial(Error);
-
-    function makeError<T1 extends ErrorConstructor>(name: string, proto: string): T1 {
-        function constr (msg: string) {
-            var res = new Error(msg);
-            (res as any).__proto__ = constr.prototype;
-            return res;
-        }
-
-        (constr as any).__proto__ = Error;
-        (constr.prototype as any).__proto__ = env.proto('error');
-        setConstr(constr.prototype, constr as ErrorConstructor);
-        setProps(constr.prototype, { name: name });
-
-        internals.markSpecial(constr);
-        env.setProto(proto, constr.prototype);
-        
-        return constr as T1;
-    }
-    
-    env.global.RangeError = makeError('RangeError', 'rangeErr');
-    env.global.TypeError = makeError('TypeError', 'typeErr');
-    env.global.SyntaxError = makeError('SyntaxError', 'syntaxErr');
-});

lib/values/function.ts

@@ -1,140 +0,0 @@
-define("values/function", () => {
-    var Function = env.global.Function = function() {
-        throw 'Using the constructor Function() is forbidden.';
-    } as unknown as FunctionConstructor;
-
-    env.setProto('function', Function.prototype);
-    setConstr(Function.prototype, Function);
-
-    setProps(Function.prototype, {
-        apply(thisArg, args) {
-            if (typeof args !== 'object') throw 'Expected arguments to be an array-like object.';
-            var len = args.length - 0;
-            let newArgs: any[];
-            if (internals.isArray(args)) newArgs = args;
-            else {
-                newArgs = [];
-
-                while (len >= 0) {
-                    len--;
-                    newArgs[len] = args[len];
-                }
-            }
-
-            return internals.apply(this, thisArg, newArgs);
-        },
-        call(thisArg, ...args) {
-            return this.apply(thisArg, args);
-        },
-        bind(thisArg, ...args) {
-            const func = this;
-            const res = function() {
-                const resArgs = [];
-
-                for (let i = 0; i < args.length; i++) {
-                    resArgs[i] = args[i];
-                }
-                for (let i = 0; i < arguments.length; i++) {
-                    resArgs[i + args.length] = arguments[i];
-                }
-
-                return func.apply(thisArg, resArgs);
-            };
-            res.name = "<bound> " + func.name;
-            return res;
-        },
-        toString() {
-            return 'function (...) { ... }';
-        },
-    });
-    setProps(Function, {
-        async(func) {
-            if (typeof func !== 'function') throw new TypeError('Expected func to be function.');
-
-            return function (this: any) {
-                const args = arguments;
-
-                return new Promise((res, rej) => {
-                    const gen = internals.apply(internals.generator(func as any), this, args as any);
-
-                    (function next(type: 'none' | 'err' | 'ret', val?: any) {
-                        try {
-                            let result;
-
-                            switch (type) {
-                                case 'err': result = gen.throw(val); break;
-                                case 'ret': result = gen.next(val); break;
-                                case 'none': result = gen.next(); break;
-                            }
-                            if (result.done) res(result.value);
-                            else Promise.resolve(result.value).then(
-                                v => next('ret', v),
-                                v => next('err', v)
-                            )
-                        }
-                        catch (e) {
-                            rej(e);
-                        }
-                    })('none');
-                });
-            };
-        },
-        asyncGenerator(func) {
-            if (typeof func !== 'function') throw new TypeError('Expected func to be function.');
-
-            return function(this: any, ...args: any[]) {
-                const gen = internals.apply(internals.generator((_yield) => func(
-                    val => _yield(['await', val]) as any,
-                    val => _yield(['yield', val])
-                )), this, args) as Generator<['await' | 'yield', any]>;
-
-                const next = (resolve: Function, reject: Function, type: 'none' | 'val' | 'ret' | 'err', val?: any) => {
-                    let res;
-
-                    try {
-                        switch (type) {
-                            case 'val': res = gen.next(val); break;
-                            case 'ret': res = gen.return(val); break;
-                            case 'err': res = gen.throw(val); break;
-                            default: res = gen.next(); break;
-                        }
-                    }
-                    catch (e) { return reject(e); }
-
-                    if (res.done) return { done: true, res: <any>res };
-                    else if (res.value[0] === 'await') Promise.resolve(res.value[1]).then(
-                        v => next(resolve, reject, 'val', v),
-                        v => next(resolve, reject, 'err', v),
-                    )
-                    else resolve({ done: false, value: res.value[1] });
-                };
-
-                return {
-                    next() {
-                        const args = arguments;
-                        if (arguments.length === 0) return new Promise((res, rej) => next(res, rej, 'none'));
-                        else return new Promise((res, rej) => next(res, rej, 'val', args[0]));
-                    },
-                    return: (value) => new Promise((res, rej) => next(res, rej, 'ret', value)),
-                    throw: (value) => new Promise((res, rej) => next(res, rej, 'err', value)),
-                    [env.global.Symbol.asyncIterator]() { return this; }
-                }
-            }
-        },
-        generator(func) {
-            if (typeof func !== 'function') throw new TypeError('Expected func to be function.');
-            const gen = internals.generator(func);
-            return function(this: any, ...args: any[]) {
-                const it = internals.apply(gen, this, args);
-
-                return {
-                    next: (...args) => internals.apply(it.next, it, args),
-                    return: (val) => internals.apply(it.next, it, [val]),
-                    throw: (val) => internals.apply(it.next, it, [val]),
-                    [env.global.Symbol.iterator]() { return this; }
-                }
-            }
-        }
-    })
-    internals.markSpecial(Function);
-});

lib/values/number.ts

@@ -1,33 +0,0 @@
-define("values/number", () => {
-    var Number = env.global.Number = function(this: Number | undefined, arg: any) {
-        var val;
-        if (arguments.length === 0) val = 0;
-        else val = arg - 0;
-        if (this === undefined || this === null) return val;
-        else (this as any).value = val;
-    } as NumberConstructor;
-
-    env.setProto('number', Number.prototype);
-    setConstr(Number.prototype, Number);
-
-    setProps(Number.prototype, {
-        valueOf() {
-            if (typeof this === 'number') return this;
-            else return (this as any).value;
-        },
-        toString() {
-            if (typeof this === 'number') return this + '';
-            else return (this as any).value + '';
-        }
-    });
-
-    setProps(Number, {
-        parseInt(val) { return Math.trunc(val as any - 0); },
-        parseFloat(val) { return val as any - 0; },
-    });
-
-    env.global.parseInt = Number.parseInt;
-    env.global.parseFloat = Number.parseFloat;
-    env.global.Object.defineProperty(env.global, 'NaN', { value: 0 / 0, writable: false });
-    env.global.Object.defineProperty(env.global, 'Infinity', { value: 1 / 0, writable: false });
-});

lib/values/object.ts

@@ -1,226 +0,0 @@
-define("values/object", () => {
-    var Object = env.global.Object = function(arg: any) {
-        if (arg === undefined || arg === null) return {};
-        else if (typeof arg === 'boolean') return new Boolean(arg);
-        else if (typeof arg === 'number') return new Number(arg);
-        else if (typeof arg === 'string') return new String(arg);
-        return arg;
-    } as ObjectConstructor;
-
-    env.setProto('object', Object.prototype);
-    (Object.prototype as any).__proto__ = null;
-    setConstr(Object.prototype, Object as any);
-
-    function throwNotObject(obj: any, name: string) {
-        if (obj === null || typeof obj !== 'object' && typeof obj !== 'function') {
-            throw new TypeError(`Object.${name} may only be used for objects.`);
-        }
-    }
-    function check(obj: any) {
-        return typeof obj === 'object' && obj !== null || typeof obj === 'function';
-    }
-
-    setProps(Object, {
-        assign(dst, ...src) {
-            throwNotObject(dst, 'assign');
-            for (let i = 0; i < src.length; i++) {
-                const obj = src[i];
-                throwNotObject(obj, 'assign');
-                for (const key of Object.keys(obj)) {
-                    (dst as any)[key] = (obj as any)[key];
-                }
-            }
-            return dst;
-        },
-        create(obj, props) {
-            props ??= {};
-            return Object.defineProperties({ __proto__: obj }, props as any) as any;
-        },
-
-        defineProperty(obj, key, attrib) {
-            throwNotObject(obj, 'defineProperty');
-            if (typeof attrib !== 'object') throw new TypeError('Expected attributes to be an object.');
-
-            if ('value' in attrib) {
-                if ('get' in attrib || 'set' in attrib) throw new TypeError('Cannot specify a value and accessors for a property.');
-                if (!internals.defineField(
-                    obj, key,
-                    attrib.value,
-                    !!attrib.writable,
-                    !!attrib.enumerable,
-                    !!attrib.configurable
-                )) throw new TypeError('Can\'t define property \'' + key + '\'.');
-            }
-            else {
-                if (typeof attrib.get !== 'function' && attrib.get !== undefined) throw new TypeError('Get accessor must be a function.');
-                if (typeof attrib.set !== 'function' && attrib.set !== undefined) throw new TypeError('Set accessor must be a function.');
-
-                if (!internals.defineProp(
-                    obj, key,
-                    attrib.get,
-                    attrib.set,
-                    !!attrib.enumerable,
-                    !!attrib.configurable
-                )) throw new TypeError('Can\'t define property \'' + key + '\'.');
-            }
-
-            return obj;
-        },
-        defineProperties(obj, attrib) {
-            throwNotObject(obj, 'defineProperties');
-            if (typeof attrib !== 'object' && typeof attrib !== 'function') throw 'Expected second argument to be an object.';
-
-            for (var key in attrib) {
-                Object.defineProperty(obj, key, attrib[key]);
-            }
-
-            return obj;
-        },
-
-        keys(obj, onlyString) {
-            return internals.keys(obj, !!(onlyString ?? true));
-        },
-        entries(obj, onlyString) {
-            const res = [];
-            const keys = internals.keys(obj, !!(onlyString ?? true));
-
-            for (let i = 0; i < keys.length; i++) {
-                res[i] = [ keys[i], (obj as any)[keys[i]] ];
-            }
-
-            return keys;
-        },
-        values(obj, onlyString) {
-            const res = [];
-            const keys = internals.keys(obj, !!(onlyString ?? true));
-
-            for (let i = 0; i < keys.length; i++) {
-                res[i] = (obj as any)[keys[i]];
-            }
-
-            return keys;
-        },
-
-        getOwnPropertyDescriptor(obj, key) {
-            return internals.ownProp(obj, key) as any;
-        },
-        getOwnPropertyDescriptors(obj) {
-            const res = [];
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                res[i] = internals.ownProp(obj, keys[i]);
-            }
-
-            return res;
-        },
-
-        getOwnPropertyNames(obj) {
-            const arr = internals.ownPropKeys(obj);
-            const res = [];
-
-            for (let i = 0; i < arr.length; i++) {
-                if (typeof arr[i] === 'symbol') continue;
-                res[res.length] = arr[i];
-            }
-
-            return res as any;
-        },
-        getOwnPropertySymbols(obj) {
-            const arr = internals.ownPropKeys(obj);
-            const res = [];
-
-            for (let i = 0; i < arr.length; i++) {
-                if (typeof arr[i] !== 'symbol') continue;
-                res[res.length] = arr[i];
-            }
-
-            return res as any;
-        },
-        hasOwn(obj, key) {
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                if (keys[i] === key) return true;
-            }
-
-            return false;
-        },
-
-        getPrototypeOf(obj) {
-            return obj.__proto__;
-        },
-        setPrototypeOf(obj, proto) {
-            (obj as any).__proto__ = proto;
-            return obj;
-        },
-
-        fromEntries(iterable) {
-            const res = {} as any;
-
-            for (const el of iterable) {
-                res[el[0]] = el[1];
-            }
-
-            return res;
-        },
-
-        preventExtensions(obj) {
-            throwNotObject(obj, 'preventExtensions');
-            internals.lock(obj, 'ext');
-            return obj;
-        },
-        seal(obj) {
-            throwNotObject(obj, 'seal');
-            internals.lock(obj, 'seal');
-            return obj;
-        },
-        freeze(obj) {
-            throwNotObject(obj, 'freeze');
-            internals.lock(obj, 'freeze');
-            return obj;
-        },
-
-        isExtensible(obj) {
-            if (!check(obj)) return false;
-            return internals.extensible(obj);
-        },
-        isSealed(obj) {
-            if (!check(obj)) return true;
-            if (internals.extensible(obj)) return false;
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                if (internals.ownProp(obj, keys[i]).configurable) return false;
-            }
-
-            return true;
-        },
-        isFrozen(obj) {
-            if (!check(obj)) return true;
-            if (internals.extensible(obj)) return false;
-            const keys = internals.ownPropKeys(obj);
-
-            for (let i = 0; i < keys.length; i++) {
-                const prop = internals.ownProp(obj, keys[i]);
-                if (prop.configurable) return false;
-                if ('writable' in prop && prop.writable) return false;
-            }
-
-            return true;
-        }
-    });
-
-    setProps(Object.prototype, {
-        valueOf() {
-            return this;
-        },
-        toString() {
-            return '[object ' + (this[env.global.Symbol.typeName] ?? 'Unknown') + ']';
-        },
-        hasOwnProperty(key) {
-            return Object.hasOwn(this, key);
-        },
-    });
-    internals.markSpecial(Object);
-});

lib/values/string.ts

@@ -1,267 +0,0 @@
-define("values/string", () => {
-    var String = env.global.String = function(this: String | undefined, arg: any) {
-        var val;
-        if (arguments.length === 0) val = '';
-        else val = arg + '';
-        if (this === undefined || this === null) return val;
-        else (this as any).value = val;
-    } as StringConstructor;
-
-    env.setProto('string', String.prototype);
-    setConstr(String.prototype, String);
-
-    setProps(String.prototype, {
-        toString() {
-            if (typeof this === 'string') return this;
-            else return (this as any).value;
-        },
-        valueOf() {
-            if (typeof this === 'string') return this;
-            else return (this as any).value;
-        },
-
-        substring(start, end) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.substring(start, end);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-            start = start ?? 0 | 0;
-            end = (end ?? this.length) | 0;
-
-            const res = [];
-
-            for (let i = start; i < end; i++) {
-                if (i >= 0 && i < this.length) res[res.length] = this[i];
-            }
-
-            return internals.stringFromStrings(res);
-        },
-        substr(start, length) {
-            start = start ?? 0 | 0;
-
-            if (start >= this.length) start = this.length - 1;
-            if (start < 0) start = 0;
-
-            length = (length ?? this.length - start) | 0;
-            const end = length + start;
-            const res = [];
-
-            for (let i = start; i < end; i++) {
-                if (i >= 0 && i < this.length) res[res.length] = this[i];
-            }
-
-            return internals.stringFromStrings(res);
-        },
-
-        toLowerCase() {
-            // TODO: Implement localization
-            const res = [];
-
-            for (let i = 0; i < this.length; i++) {
-                const c = internals.char(this[i]);
-
-                if (c >= 65 && c <= 90) res[i] = c - 65 + 97;
-                else res[i] = c;
-            }
-
-            return internals.stringFromChars(res);
-        },
-        toUpperCase() {
-            // TODO: Implement localization
-            const res = [];
-
-            for (let i = 0; i < this.length; i++) {
-                const c = internals.char(this[i]);
-
-                if (c >= 97 && c <= 122) res[i] = c - 97 + 65;
-                else res[i] = c;
-            }
-
-            return internals.stringFromChars(res);
-        },
-
-        charAt(pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.charAt(pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            pos = pos | 0;
-            if (pos < 0 || pos >= this.length) return '';
-            return this[pos];
-        },
-        charCodeAt(pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.charAt(pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            pos = pos | 0;
-            if (pos < 0 || pos >= this.length) return 0 / 0;
-            return internals.char(this[pos]);
-        },
-
-        startsWith(term, pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.startsWith(term, pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-            pos = pos! | 0;
-            term = term + "";
-
-            if (pos < 0 || this.length < term.length + pos) return false;
-
-            for (let i = 0; i < term.length; i++) {
-                if (this[i + pos] !== term[i]) return false;
-            }
-
-            return true;
-        },
-        endsWith(term, pos) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.endsWith(term, pos);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-            pos = (pos ?? this.length) | 0;
-            term = term + "";
-
-            const start = pos - term.length;
-
-            if (start < 0 || this.length < term.length + start) return false;
-
-            for (let i = 0; i < term.length; i++) {
-                if (this[i + start] !== term[i]) return false;
-            }
-
-            return true;
-        },
-
-        indexOf(term: any, start) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.indexOf(term, start);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof term[env.global.Symbol.search] !== 'function') term = RegExp.escape(term);
-
-            return term[env.global.Symbol.search](this, false, start);
-        },
-        lastIndexOf(term: any, start) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.indexOf(term, start);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof term[env.global.Symbol.search] !== 'function') term = RegExp.escape(term);
-
-            return term[env.global.Symbol.search](this, true, start);
-        },
-        includes(term, start) {
-            return this.indexOf(term, start) >= 0;
-        },
-
-        replace(pattern: any, val) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.replace(pattern, val);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.replace] !== 'function') pattern = RegExp.escape(pattern);
-
-            return pattern[env.global.Symbol.replace](this, val);
-        },
-        replaceAll(pattern: any, val) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.replace(pattern, val);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.replace] !== 'function') pattern = RegExp.escape(pattern, "g");
-            if (pattern instanceof RegExp && !pattern.global) pattern = new pattern.constructor(pattern.source, pattern.flags + "g");
-
-            return pattern[env.global.Symbol.replace](this, val);
-        },
-
-        match(pattern: any) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.match(pattern);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.match] !== 'function') pattern = RegExp.escape(pattern);
-
-            return pattern[env.global.Symbol.match](this);
-        },
-        matchAll(pattern: any) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.matchAll(pattern);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.match] !== 'function') pattern = RegExp.escape(pattern, "g");
-            if (pattern instanceof RegExp && !pattern.global) pattern = new pattern.constructor(pattern.source, pattern.flags + "g");
-
-            return pattern[env.global.Symbol.match](this);
-        },
-
-        split(pattern: any, lim, sensible) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.split(pattern, lim, sensible);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            if (typeof pattern[env.global.Symbol.split] !== 'function') pattern = RegExp.escape(pattern, "g");
-
-            return pattern[env.global.Symbol.split](this, lim, sensible);
-        },
-        slice(start, end) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.slice(start, end);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            start = wrapI(this.length, start ?? 0 | 0);
-            end = wrapI(this.length, end ?? this.length | 0);
-
-            if (start > end) return '';
-
-            return this.substring(start, end);
-        },
-
-        concat(...args) {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.concat(...args);
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            var res = this;
-            for (var arg of args) res += arg;
-            return res;
-        },
-
-        trim() {
-            return this
-                .replace(/^\s+/g, '')
-                .replace(/\s+$/g, '');
-        }
-    });
-
-    setProps(String, {
-        fromCharCode(val) {
-            return internals.stringFromChars([val | 0]);
-        },
-    })
-
-    env.global.Object.defineProperty(String.prototype, 'length', {
-        get() {
-            if (typeof this !== 'string') {
-                if (this instanceof String) return (this as any).value.length;
-                else throw new Error('This function may be used only with primitive or object strings.');
-            }
-
-            return internals.strlen(this);
-        },
-        configurable: true,
-        enumerable: false,
-    });
-});

lib/values/symbol.ts

@@ -1,36 +0,0 @@
-define("values/symbol", () => {
-    const symbols: Record<string, symbol> = { };
-
-    var Symbol = env.global.Symbol = function(this: any, val?: string) {
-        if (this !== undefined && this !== null) throw new TypeError("Symbol may not be called with 'new'.");
-        if (typeof val !== 'string' && val !== undefined) throw new TypeError('val must be a string or undefined.');
-        return internals.symbol(val);
-    } as SymbolConstructor;
-
-    env.setProto('symbol', Symbol.prototype);
-    setConstr(Symbol.prototype, Symbol);
-
-    setProps(Symbol, {
-        for(key) {
-            if (typeof key !== 'string' && key !== undefined) throw new TypeError('key must be a string or undefined.');
-            if (key in symbols) return symbols[key];
-            else return symbols[key] = internals.symbol(key);
-        },
-        keyFor(sym) {
-            if (typeof sym !== 'symbol') throw new TypeError('sym must be a symbol.');
-            return internals.symbolToString(sym);
-        },
-
-        typeName: Symbol("Symbol.name") as any,
-        replace: Symbol('Symbol.replace') as any,
-        match: Symbol('Symbol.match') as any,
-        matchAll: Symbol('Symbol.matchAll') as any,
-        split: Symbol('Symbol.split') as any,
-        search: Symbol('Symbol.search') as any,
-        iterator: Symbol('Symbol.iterator') as any,
-        asyncIterator: Symbol('Symbol.asyncIterator') as any,
-    });
-
-    internals.defineField(env.global.Object.prototype, Symbol.typeName, 'Object', false, false, false);
-    internals.defineField(env.global, Symbol.typeName, 'Window', false, false, false);
-});

package-lock.json

@@ -1,6 +0,0 @@
-{
-  "name": "java-jscript",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {}
-}

package.json

@@ -1 +0,0 @@
-{}

src/me/topchetoeu/jscript/Main.java

@@ -7,21 +7,20 @@ import java.io.InputStreamReader;
 import java.nio.file.Files;
 import java.nio.file.Path;
 
-import me.topchetoeu.jscript.engine.MessageContext;
-import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.engine.Message;
 import me.topchetoeu.jscript.engine.Engine;
-import me.topchetoeu.jscript.engine.FunctionContext;
+import me.topchetoeu.jscript.engine.Environment;
+import me.topchetoeu.jscript.engine.values.NativeFunction;
 import me.topchetoeu.jscript.engine.values.Values;
 import me.topchetoeu.jscript.events.Observer;
 import me.topchetoeu.jscript.exceptions.EngineException;
 import me.topchetoeu.jscript.exceptions.SyntaxException;
-import me.topchetoeu.jscript.interop.NativeTypeRegister;
 import me.topchetoeu.jscript.polyfills.Internals;
 
 public class Main {
     static Thread task;
     static Engine engine;
-    static FunctionContext env;
+    static Environment env;
 
     public static String streamToString(InputStream in) {
         try {
@@ -47,37 +46,14 @@ public class Main {
 
     private static Observer<Object> valuePrinter = new Observer<Object>() {
         public void next(Object data) {
-            try {
-                Values.printValue(null, data);
-            }
+            try { Values.printValue(null, data); }
             catch (InterruptedException e) { }
             System.out.println();
         }
 
         public void error(RuntimeException err) {
-            try {
-                try {
-                    if (err instanceof EngineException) {
-                        System.out.println("Uncaught " + ((EngineException)err).toString(new Context(null, new MessageContext(engine))));
-                    }
-                    else if (err instanceof SyntaxException) {
-                        System.out.println("Syntax error:" + ((SyntaxException)err).msg);
-                    }
-                    else if (err.getCause() instanceof InterruptedException) return;
-                    else {
-                        System.out.println("Internal error ocurred:");
-                        err.printStackTrace();
-                    }
-                }
-                catch (EngineException ex) {
-                    System.out.println("Uncaught ");
-                    Values.printValue(null, ((EngineException)err).value);
-                    System.out.println();
-                }
-            }
-            catch (InterruptedException ex) {
-                return;
-            }
+            try { Values.printError(err, null); }
+            catch (InterruptedException ex) { return; }
         }
     };
 
@@ -85,26 +61,30 @@ public class Main {
         System.out.println(String.format("Running %s v%s by %s", Metadata.NAME, Metadata.VERSION, Metadata.AUTHOR));
         var in = new BufferedReader(new InputStreamReader(System.in));
         engine = new Engine();
-        env = new FunctionContext(null, null, null);
-        var builderEnv = new FunctionContext(null, new NativeTypeRegister(), null);
+
+        env = new Environment(null, null, null);
         var exited = new boolean[1];
 
-        env.global.define("exit", ctx -> {
-            exited[0] = true;
-            task.interrupt();
-            throw new InterruptedException();
-        });
-        env.global.define("go", ctx -> {
-            try {
-                var func = ctx.compile("do.js", new String(Files.readAllBytes(Path.of("do.js"))));
-                return func.call(ctx);
-            }
-            catch (IOException e) {
-                throw new EngineException("Couldn't open do.js");
-            }
-        });
+        engine.pushMsg(false, new Message(engine), new NativeFunction((ctx, thisArg, _a) -> {
+            new Internals().apply(env);
 
-        engine.pushMsg(false, new Context(builderEnv, new MessageContext(engine)), "core.js", resourceToString("js/core.js"), null, env, new Internals()).toObservable().on(valuePrinter);
+            env.global.define("exit", _ctx -> {
+                exited[0] = true;
+                task.interrupt();
+                throw new InterruptedException();
+            });
+            env.global.define("go", _ctx -> {
+                try {
+                    var func = _ctx.compile("do.js", new String(Files.readAllBytes(Path.of("do.js"))));
+                    return func.call(_ctx);
+                }
+                catch (IOException e) {
+                    throw new EngineException("Couldn't open do.js");
+                }
+            });
+
+            return null;
+        }), null);
 
         task = engine.start();
         var reader = new Thread(() -> {
@@ -114,7 +94,7 @@ public class Main {
                         var raw = in.readLine();
 
                         if (raw == null) break;
-                        engine.pushMsg(false, new Context(env, new MessageContext(engine)), "<stdio>", raw, null).toObservable().once(valuePrinter);
+                        engine.pushMsg(false, env.context(new Message(engine)), "<stdio>", raw, null).toObservable().once(valuePrinter);
                     }
                     catch (EngineException e) {
                         try {

src/me/topchetoeu/jscript/compilation/AssignStatement.java

@@ -1,19 +0,0 @@
-package me.topchetoeu.jscript.compilation;
-
-import java.util.List;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
-
-public abstract class AssignStatement extends Statement {
-    public abstract void compile(List<Instruction> target, ScopeRecord scope, boolean retPrevValue);
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        compile(target, scope, false);
-    }
-
-    protected AssignStatement(Location loc) {
-        super(loc);
-    }
-}

src/me/topchetoeu/jscript/compilation/AssignableStatement.java

@@ -4,7 +4,7 @@ import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.engine.Operation;
 
 public abstract class AssignableStatement extends Statement {
-    public abstract AssignStatement toAssign(Statement val, Operation operation);
+    public abstract Statement toAssign(Statement val, Operation operation);
 
     protected AssignableStatement(Location loc) {
         super(loc);

src/me/topchetoeu/jscript/compilation/CompileOptions.java

@@ -1,11 +0,0 @@
-package me.topchetoeu.jscript.compilation;
-
-public class CompileOptions {
-    public final boolean emitBpMap;
-    public final boolean emitVarNames;
-
-    public CompileOptions(boolean emitBpMap, boolean emitVarNames) {
-        this.emitBpMap = emitBpMap;
-        this.emitVarNames = emitVarNames;
-    }
-}

src/me/topchetoeu/jscript/compilation/CompileTarget.java

@@ -0,0 +1,27 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.Map;
+import java.util.Vector;
+
+public class CompileTarget {
+    public final Vector<Instruction> target = new Vector<>();
+    public final Map<Long, Instruction[]> functions;
+
+    public Instruction add(Instruction instr) {
+        target.add(instr);
+        return instr;
+    }
+    public Instruction set(int i, Instruction instr) {
+        return target.set(i, instr);
+    }
+    public Instruction get(int i) {
+        return target.get(i);
+    }
+    public int size() { return target.size(); }
+
+    public Instruction[] array() { return target.toArray(Instruction[]::new); }
+
+    public CompileTarget(Map<Long, Instruction[]> functions) {
+        this.functions = functions;
+    }
+}

src/me/topchetoeu/jscript/compilation/CompoundStatement.java

@@ -1,7 +1,6 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Vector;
 
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.control.ContinueStatement;
@@ -13,16 +12,6 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class CompoundStatement extends Statement {
     public final Statement[] statements;
 
-    @Override
-    public boolean pollutesStack() {
-        for (var stm : statements) {
-            if (stm instanceof FunctionStatement) continue;
-            return true;
-        }
-
-        return false;
-    }
-
     @Override
     public void declare(ScopeRecord varsScope) {
         for (var stm : statements) {
@@ -31,7 +20,7 @@ public class CompoundStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var stm : statements) {
             if (stm instanceof FunctionStatement) {
                 int start = target.size();
@@ -45,14 +34,14 @@ public class CompoundStatement extends Statement {
             var stm = statements[i];
             
             if (stm instanceof FunctionStatement) continue;
-            if (i != statements.length - 1) stm.compileNoPollution(target, scope, true);
-            else stm.compileWithPollution(target, scope);
+            if (i != statements.length - 1) stm.compileWithDebug(target, scope, false);
+            else stm.compileWithDebug(target, scope, pollute);
         }
     }
 
     @Override
     public Statement optimize() {
-        var res = new ArrayList<Statement>();
+        var res = new Vector<Statement>(statements.length);
 
         for (var i = 0; i < statements.length; i++) {
             var stm = statements[i].optimize();

src/me/topchetoeu/jscript/compilation/DiscardStatement.java

@@ -1,7 +1,5 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.values.ConstantStatement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,13 +8,9 @@ public class DiscardStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        if (value == null) return;
-        value.compile(target, scope);
-        if (value.pollutesStack()) target.add(Instruction.discard());
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        value.compile(target, scope, false);
+        
     }
     @Override
     public Statement optimize() {

src/me/topchetoeu/jscript/compilation/Instruction.java

@@ -7,7 +7,6 @@ import me.topchetoeu.jscript.exceptions.SyntaxException;
 public class Instruction {
     public static enum Type {
         RETURN,
-        SIGNAL,
         THROW,
         THROW_SYNTAX,
         DELETE,
@@ -162,12 +161,6 @@ public class Instruction {
         return new Instruction(null, Type.NOP, args);
     }
 
-    /**
-     * ATTENTION: Usage outside of try/catch is broken af
-     */
-    public static Instruction signal(String name) {
-        return new Instruction(null, Type.SIGNAL, name);
-    }
     public static Instruction nop(Object ...params) {
         for (var param : params) {
             if (param instanceof String) continue;
@@ -221,9 +214,9 @@ public class Instruction {
     public static Instruction loadRegex(String pattern, String flags) {
         return new Instruction(null, Type.LOAD_REGEX, pattern, flags);
     }
-    public static Instruction loadFunc(int instrN, int varN, int len, int[] captures) {
+    public static Instruction loadFunc(long id, int varN, int len, int[] captures) {
         var args = new Object[3 + captures.length];
-        args[0] = instrN;
+        args[0] = id;
         args[1] = varN;
         args[2] = len;
         for (var i = 0; i < captures.length; i++) args[i + 3] = captures[i];

src/me/topchetoeu/jscript/compilation/Statement.java

@@ -1,36 +1,20 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public abstract class Statement {
     private Location _loc;
 
-    public abstract boolean pollutesStack();
     public boolean pure() { return false; }
-    public abstract void compile(List<Instruction> target, ScopeRecord scope);
+    public abstract void compile(CompileTarget target, ScopeRecord scope, boolean pollute);
     public void declare(ScopeRecord varsScope) { }
     public Statement optimize() { return this; }
 
-    public void compileNoPollution(List<Instruction> target, ScopeRecord scope, boolean debug) {
+    public void compileWithDebug(CompileTarget target, ScopeRecord scope, boolean pollute) {
         int start = target.size();
-        compile(target, scope);
-        if (debug && target.size() != start) target.get(start).setDebug(true);
-        if (pollutesStack()) target.add(Instruction.discard().locate(loc()));
-    }
-    public void compileWithPollution(List<Instruction> target, ScopeRecord scope, boolean debug) {
-        int start = target.size();
-        compile(target, scope);
-        if (debug && target.size() != start) target.get(start).setDebug(true);
-        if (!pollutesStack()) target.add(Instruction.loadValue(null).locate(loc()));
-    }
-    public void compileNoPollution(List<Instruction> target, ScopeRecord scope) {
-        compileNoPollution(target, scope, false);
-    }
-    public void compileWithPollution(List<Instruction> target, ScopeRecord scope) {
-        compileWithPollution(target, scope, false);
+        compile(target, scope, pollute);
+        if (target.size() != start) target.get(start).setDebug(true);
     }
 
     public Location loc() { return _loc; }

src/me/topchetoeu/jscript/compilation/VariableDeclareStatement.java

@@ -19,8 +19,6 @@ public class VariableDeclareStatement extends Statement {
 
     public final List<Pair> values;
 
-    @Override
-    public boolean pollutesStack() { return false; }
     @Override
     public void declare(ScopeRecord varsScope) {
         for (var key : values) {
@@ -28,7 +26,7 @@ public class VariableDeclareStatement extends Statement {
         }
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var entry : values) {
             if (entry.name == null) continue;
             var key = scope.getKey(entry.name);
@@ -39,10 +37,12 @@ public class VariableDeclareStatement extends Statement {
                 target.add(Instruction.storeVar(key).locate(loc()));
             }
             else if (entry.value != null) {
-                entry.value.compileWithPollution(target, scope);
+                entry.value.compile(target, scope, true);
                 target.add(Instruction.storeVar(key).locate(loc()));
             }
         }
+
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public VariableDeclareStatement(Location loc, List<Pair> values) {

src/me/topchetoeu/jscript/compilation/control/ArrayStatement.java

@@ -1,37 +1,35 @@
-package me.topchetoeu.jscript.compilation.values;
-
-import java.util.List;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.Instruction;
-import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
-
-public class ArrayStatement extends Statement {
-    public final Statement[] statements;
-
-    @Override
-    public boolean pollutesStack() { return true; }
-    @Override
-    public boolean pure() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        target.add(Instruction.loadArr(statements.length).locate(loc()));
-        var i = 0;
-        for (var el : statements) {
-            if (el != null) {
-                target.add(Instruction.dup().locate(loc()));
-                target.add(Instruction.loadValue(i).locate(loc()));
-                el.compileWithPollution(target, scope);
-                target.add(Instruction.storeMember().locate(loc()));
-            }
-            i++;
-        }
-    }
-
-    public ArrayStatement(Location loc, Statement[] statements) {
-        super(loc);
-        this.statements = statements;
-    }
-}
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
+import me.topchetoeu.jscript.compilation.Instruction;
+import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.engine.scope.ScopeRecord;
+
+public class ArrayStatement extends Statement {
+    public final Statement[] statements;
+
+    @Override
+    public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        target.add(Instruction.loadArr(statements.length).locate(loc()));
+        var i = 0;
+        for (var el : statements) {
+            if (el != null) {
+                target.add(Instruction.dup().locate(loc()));
+                target.add(Instruction.loadValue(i).locate(loc()));
+                el.compile(target, scope, true);
+                target.add(Instruction.storeMember().locate(loc()));
+            }
+            i++;
+        }
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
+    }
+
+    public ArrayStatement(Location loc, Statement[] statements) {
+        super(loc);
+        this.statements = statements;
+    }
+}

src/me/topchetoeu/jscript/compilation/control/BreakStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,11 +10,9 @@ public class BreakStatement extends Statement {
     public final String label;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop("break", label).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public BreakStatement(Location loc, String label) {

src/me/topchetoeu/jscript/compilation/control/ContinueStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,11 +10,9 @@ public class ContinueStatement extends Statement {
     public final String label;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop("cont", label).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public ContinueStatement(Location loc, String label) {

src/me/topchetoeu/jscript/compilation/control/DebugStatement.java

@@ -1,19 +1,16 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class DebugStatement extends Statement {
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.debug().locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public DebugStatement(Location loc) {

src/me/topchetoeu/jscript/compilation/control/DeleteStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,13 +11,12 @@ public class DeleteStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return true; }
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        value.compile(target, scope, true);
+        key.compile(target, scope, true);
 
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        value.compile(target, scope);
-        key.compile(target, scope);
         target.add(Instruction.delete().locate(loc()));
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public DeleteStatement(Location loc, Statement key, Statement value) {

src/me/topchetoeu/jscript/compilation/control/DoWhileStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
@@ -14,19 +13,16 @@ public class DoWhileStatement extends Statement {
     public final Statement condition, body;
     public final String label;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         body.declare(globScope);
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             int start = target.size();
-            body.compileNoPollution(target, scope);
+            body.compile(target, scope, false);
             int end = target.size();
             if (Values.toBoolean(((ConstantStatement)condition).value)) {
                 WhileStatement.replaceBreaks(target, label, start, end, end + 1, end + 1);
@@ -35,13 +31,14 @@ public class DoWhileStatement extends Statement {
                 target.add(Instruction.jmp(start - end).locate(loc()));
                 WhileStatement.replaceBreaks(target, label, start, end, start, end + 1);
             }
+            if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
             return;
         }
 
         int start = target.size();
-        body.compileNoPollution(target, scope, true);
+        body.compileWithDebug(target, scope, false);
         int mid = target.size();
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
         int end = target.size();
 
         WhileStatement.replaceBreaks(target, label, start, mid - 1, mid, end + 1);

src/me/topchetoeu/jscript/compilation/control/ForInStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -14,9 +13,6 @@ public class ForInStatement extends Statement {
     public final Statement varValue, object, body;
     public final String label;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         body.declare(globScope);
@@ -24,16 +20,16 @@ public class ForInStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var key = scope.getKey(varName);
         if (key instanceof String) target.add(Instruction.makeVar((String)key));
 
         if (varValue != null) {
-            varValue.compileWithPollution(target, scope);
+            varValue.compile(target, scope, true);
             target.add(Instruction.storeVar(scope.getKey(varName)));
         }
 
-        object.compileWithPollution(target, scope);
+        object.compile(target, scope, true);
         target.add(Instruction.keys());
         
         int start = target.size();
@@ -58,8 +54,7 @@ public class ForInStatement extends Statement {
 
         for (var i = start; i < target.size(); i++) target.get(i).locate(loc());
 
-        body.compileNoPollution(target, scope, true);
-
+        body.compileWithDebug(target, scope, false);
 
         int end = target.size();
 
@@ -68,6 +63,7 @@ public class ForInStatement extends Statement {
         target.add(Instruction.jmp(start - end).locate(loc()));
         target.add(Instruction.discard().locate(loc()));
         target.set(mid, Instruction.jmpIf(end - mid + 1).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public ForInStatement(Location loc, String label, boolean isDecl, String varName, Statement varValue, Statement object, Statement body) {

src/me/topchetoeu/jscript/compilation/control/ForStatement.java

@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.values.ConstantStatement;
@@ -14,44 +13,43 @@ public class ForStatement extends Statement {
     public final Statement declaration, assignment, condition, body;
     public final String label;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         declaration.declare(globScope);
         body.declare(globScope);
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        declaration.compile(target, scope);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        declaration.compile(target, scope, false);
 
         if (condition instanceof ConstantStatement) {
             if (Values.toBoolean(((ConstantStatement)condition).value)) {
                 int start = target.size();
-                body.compileNoPollution(target, scope);
+                body.compile(target, scope, false);
                 int mid = target.size();
-                assignment.compileNoPollution(target, scope, true);
+                assignment.compileWithDebug(target, scope, false);
                 int end = target.size();
                 WhileStatement.replaceBreaks(target, label, start, mid, mid, end + 1);
                 target.add(Instruction.jmp(start - target.size()).locate(loc()));
-                return;
+                if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
             }
+            return;
         }
 
         int start = target.size();
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
         int mid = target.size();
         target.add(Instruction.nop());
-        body.compileNoPollution(target, scope);
+        body.compile(target, scope, false);
         int beforeAssign = target.size();
-        assignment.compile(target, scope);
+        assignment.compileWithDebug(target, scope, false);
         int end = target.size();
 
         WhileStatement.replaceBreaks(target, label, mid + 1, end, beforeAssign, end + 1);
 
         target.add(Instruction.jmp(start - end).locate(loc()));
         target.set(mid, Instruction.jmpIfNot(end - mid + 1).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
     @Override
     public Statement optimize() {

src/me/topchetoeu/jscript/compilation/control/IfStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.DiscardStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
@@ -14,9 +13,6 @@ import me.topchetoeu.jscript.engine.values.Values;
 public class IfStatement extends Statement {
     public final Statement condition, body, elseBody;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         body.declare(globScope);
@@ -24,33 +20,34 @@ public class IfStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)condition).value)) {
-                if (elseBody != null) elseBody.compileNoPollution(target, scope, true);
+                if (elseBody != null) elseBody.compileWithDebug(target, scope, pollute);
             }
             else {
-                body.compileNoPollution(target, scope, true);
+                body.compileWithDebug(target, scope, pollute);
             }
 
             return;
         }
 
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
+
         if (elseBody == null) {
             int i = target.size();
             target.add(Instruction.nop());
-            body.compileNoPollution(target, scope, true);
+            body.compileWithDebug(target, scope, pollute);
             int endI = target.size();
             target.set(i, Instruction.jmpIfNot(endI - i).locate(loc()));
         }
         else {
             int start = target.size();
             target.add(Instruction.nop());
-            body.compileNoPollution(target, scope, true);
+            body.compileWithDebug(target, scope, pollute);
             target.add(Instruction.nop());
             int mid = target.size();
-            elseBody.compileNoPollution(target, scope, true);
+            elseBody.compileWithDebug(target, scope, pollute);
             int end = target.size();
 
             target.set(start, Instruction.jmpIfNot(mid - start).locate(loc()));

src/me/topchetoeu/jscript/compilation/control/ReturnStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,12 +10,9 @@ public class ReturnStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (value == null) target.add(Instruction.loadValue(null).locate(loc()));
-        else value.compileWithPollution(target, scope);
+        else value.compile(target, scope, true);
         target.add(Instruction.ret().locate(loc()));
     }
 

src/me/topchetoeu/jscript/compilation/control/SwitchStatement.java

@@ -1,9 +1,9 @@
 package me.topchetoeu.jscript.compilation.control;
 
 import java.util.HashMap;
-import java.util.List;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.Instruction.Type;
@@ -21,9 +21,6 @@ public class SwitchStatement extends Statement {
         }
     }
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     public final Statement value;
     public final SwitchCase[] cases;
     public final Statement[] body;
@@ -35,15 +32,15 @@ public class SwitchStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var caseMap = new HashMap<Integer, Integer>();
         var stmIndexMap = new HashMap<Integer, Integer>();
 
-        value.compile(target, scope);
+        value.compile(target, scope, true);
 
         for (var ccase : cases) {
             target.add(Instruction.dup().locate(loc()));
-            ccase.value.compileWithPollution(target, scope);
+            ccase.value.compile(target, scope, true);
             target.add(Instruction.operation(Operation.EQUALS).locate(loc()));
             caseMap.put(target.size(), ccase.statementI);
             target.add(Instruction.nop());
@@ -55,7 +52,7 @@ public class SwitchStatement extends Statement {
 
         for (var stm : body) {
             stmIndexMap.put(stmIndexMap.size(), target.size());
-            stm.compileNoPollution(target, scope, true);
+            stm.compileWithDebug(target, scope, false);
         }
 
         if (defaultI < 0 || defaultI >= body.length) target.set(start, Instruction.jmp(target.size() - start).locate(loc()));

src/me/topchetoeu/jscript/compilation/control/ThrowStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,11 +10,8 @@ public class ThrowStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return false; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        value.compileWithPollution(target, scope);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        value.compile(target, scope, true);
         target.add(Instruction.throwInstr().locate(loc()));
     }
 

src/me/topchetoeu/jscript/compilation/control/TryStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.GlobalScope;
@@ -15,9 +14,6 @@ public class TryStatement extends Statement {
     public final Statement finallyBody;
     public final String name;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         tryBody.declare(globScope);
@@ -26,30 +22,31 @@ public class TryStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop());
 
         int start = target.size(), tryN, catchN = -1, finN = -1;
 
-        tryBody.compileNoPollution(target, scope);
+        tryBody.compile(target, scope, false);
         tryN = target.size() - start;
 
         if (catchBody != null) {
             int tmp = target.size();
             var local = scope instanceof GlobalScope ? scope.child() : (LocalScopeRecord)scope;
             local.define(name, true);
-            catchBody.compileNoPollution(target, scope);
+            catchBody.compile(target, scope, false);
             local.undefine();
             catchN = target.size() - tmp;
         }
 
         if (finallyBody != null) {
             int tmp = target.size();
-            finallyBody.compileNoPollution(target, scope);
+            finallyBody.compile(target, scope, false);
             finN = target.size() - tmp;
         }
 
         target.set(start - 1, Instruction.tryInstr(tryN, catchN, finN).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public TryStatement(Location loc, Statement tryBody, Statement catchBody, Statement finallyBody, String name) {

src/me/topchetoeu/jscript/compilation/control/WhileStatement.java

@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.DiscardStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
@@ -16,19 +15,16 @@ public class WhileStatement extends Statement {
     public final Statement condition, body;
     public final String label;
 
-    @Override
-    public boolean pollutesStack() { return false; }
-
     @Override
     public void declare(ScopeRecord globScope) {
         body.declare(globScope);
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             if (Values.toBoolean(((ConstantStatement)condition).value)) {
                 int start = target.size();
-                body.compileNoPollution(target, scope);
+                body.compile(target, scope, false);
                 int end = target.size();
                 replaceBreaks(target, label, start, end, start, end + 1);
                 target.add(Instruction.jmp(start - target.size()).locate(loc()));
@@ -37,10 +33,10 @@ public class WhileStatement extends Statement {
         }
 
         int start = target.size();
-        condition.compileWithPollution(target, scope);
+        condition.compile(target, scope, true);
         int mid = target.size();
         target.add(Instruction.nop());
-        body.compileNoPollution(target, scope);
+        body.compile(target, scope, false);
 
         int end = target.size();
 
@@ -48,6 +44,7 @@ public class WhileStatement extends Statement {
 
         target.add(Instruction.jmp(start - end).locate(loc()));
         target.set(mid, Instruction.jmpIfNot(end - mid + 1).locate(loc()));
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
     @Override
     public Statement optimize() {
@@ -70,7 +67,7 @@ public class WhileStatement extends Statement {
         this.body = body;
     }
 
-    public static void replaceBreaks(List<Instruction> target, String label, int start, int end, int continuePoint, int breakPoint) {
+    public static void replaceBreaks(CompileTarget target, String label, int start, int end, int continuePoint, int breakPoint) {
         for (int i = start; i < end; i++) {
             var instr = target.get(i);
             if (instr.type == Type.NOP && instr.is(0, "cont") && (instr.get(1) == null || instr.is(1, label))) {

src/me/topchetoeu/jscript/compilation/values/CallStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,23 +11,19 @@ public class CallStatement extends Statement {
     public final Statement[] args;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (func instanceof IndexStatement) {
-            ((IndexStatement)func).compile(target, scope, true);
+            ((IndexStatement)func).compile(target, scope, true, true);
         }
         else {
-            target.add(Instruction.loadValue(null).locate(loc()));
-            func.compileWithPollution(target, scope);
+               target.add(Instruction.loadValue(null).locate(loc()));
+            func.compile(target, scope, true);
         }
 
-        for (var arg : args) {
-            arg.compileWithPollution(target, scope);
-        }
+        for (var arg : args) arg.compile(target, scope, true);
 
         target.add(Instruction.call(args.length).locate(loc()).setDebug(true));
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public CallStatement(Location loc, Statement func, Statement ...args) {

src/me/topchetoeu/jscript/compilation/values/ChangeStatement.java

@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -15,11 +14,9 @@ public class ChangeStatement extends Statement {
     public final boolean postfix;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, scope, postfix);
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public ChangeStatement(Location loc, AssignableStatement value, double addAmount, boolean postfix) {

src/me/topchetoeu/jscript/compilation/values/CommaStatement.java

@@ -1,38 +0,0 @@
-package me.topchetoeu.jscript.compilation.values;
-
-import java.util.List;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.Instruction;
-import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
-
-public class CommaStatement extends Statement {
-    public final Statement first;
-    public final Statement second;
-
-    @Override
-    public boolean pollutesStack() { return true; }
-    @Override
-    public boolean pure() { return first.pure() && second.pure(); }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        first.compileNoPollution(target, scope);
-        second.compileWithPollution(target, scope);
-    }
-
-    @Override
-    public Statement optimize() {
-        var f = first.optimize();
-        var s = second.optimize();
-        if (f.pure()) return s;
-        else return new CommaStatement(loc(), f, s);
-    }
-
-    public CommaStatement(Location loc, Statement first, Statement second) {
-        super(loc);
-        this.first = first;
-        this.second = second;
-    }
-}

src/me/topchetoeu/jscript/compilation/values/ConstantStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,14 +9,12 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class ConstantStatement extends Statement {
     public final Object value;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        target.add(Instruction.loadValue(value).locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (pollute) target.add(Instruction.loadValue(value).locate(loc()));
     }
 
     public ConstantStatement(Location loc, Object val) {

src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java

@@ -1,8 +1,9 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
+import java.util.Random;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
@@ -15,17 +16,17 @@ public class FunctionStatement extends Statement {
     public final String name;
     public final String[] args;
 
+    private static Random rand = new Random();
+
     @Override
     public boolean pure() { return name == null; }
-    @Override
-    public boolean pollutesStack() { return true; }
 
     @Override
     public void declare(ScopeRecord scope) {
         if (name != null) scope.define(name);
     }
 
-    public static void checkBreakAndCont(List<Instruction> target, int start) {
+    public static void checkBreakAndCont(CompileTarget target, int start) {
         for (int i = start; i < target.size(); i++) {
             if (target.get(i).type == Type.NOP) {
                 if (target.get(i).is(0, "break") ) {
@@ -38,7 +39,7 @@ public class FunctionStatement extends Statement {
         }
     }
 
-    public void compile(List<Instruction> target, ScopeRecord scope, String name, boolean isStatement) {
+    public void compile(CompileTarget target, ScopeRecord scope, String name, boolean isStatement) {
         for (var i = 0; i < args.length; i++) {
             for (var j = 0; j < i; j++) {
                 if (args[i].equals(args[j])){
@@ -50,32 +51,33 @@ public class FunctionStatement extends Statement {
         var subscope = scope.child();
 
         int start = target.size();
+        var funcTarget = new CompileTarget(target.functions);
 
-        target.add(Instruction.nop());
         subscope.define("this");
         var argsVar = subscope.define("arguments");
 
         if (args.length > 0) {
             for (var i = 0; i < args.length; i++) {
-                target.add(Instruction.loadVar(argsVar).locate(loc()));
-                target.add(Instruction.loadMember(i).locate(loc()));
-                target.add(Instruction.storeVar(subscope.define(args[i])).locate(loc()));
+                funcTarget.add(Instruction.loadVar(argsVar).locate(loc()));
+                funcTarget.add(Instruction.loadMember(i).locate(loc()));
+                funcTarget.add(Instruction.storeVar(subscope.define(args[i])).locate(loc()));
             }
         }
 
         if (!isStatement && this.name != null) {
-            target.add(Instruction.storeSelfFunc((int)subscope.define(this.name)));
+            funcTarget.add(Instruction.storeSelfFunc((int)subscope.define(this.name)));
         }
 
         body.declare(subscope);
-        target.add(Instruction.debugVarNames(subscope.locals()));
-        body.compile(target, subscope);
+        funcTarget.add(Instruction.debugVarNames(subscope.locals()));
+        body.compile(funcTarget, subscope, false);
+        funcTarget.add(Instruction.ret().locate(loc()));
+        checkBreakAndCont(funcTarget, start);
 
-        checkBreakAndCont(target, start);
+        var id = rand.nextLong();
 
-        if (!(body instanceof CompoundStatement)) target.add(Instruction.ret().locate(loc()));
-
-        target.set(start, Instruction.loadFunc(target.size() - start, subscope.localsCount(), args.length, subscope.getCaptures()).locate(loc()));
+        target.add(Instruction.loadFunc(id, subscope.localsCount(), args.length, subscope.getCaptures()).locate(loc()));
+        target.functions.put(id, funcTarget.array());
 
         if (name == null) name = this.name;
 
@@ -90,12 +92,14 @@ public class FunctionStatement extends Statement {
             var key = scope.getKey(this.name);
 
             if (key instanceof String) target.add(Instruction.makeVar((String)key).locate(loc()));
-            target.add(Instruction.storeVar(scope.getKey(this.name), true).locate(loc()));
+            target.add(Instruction.storeVar(scope.getKey(this.name), false).locate(loc()));
         }
+
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         compile(target, scope, null, false);
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public FunctionStatement(Location loc, String name, String[] args, CompoundStatement body) {

src/me/topchetoeu/jscript/compilation/values/GlobalThisStatement.java

@@ -1,21 +1,18 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class GlobalThisStatement extends Statement {
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        target.add(Instruction.loadGlob().locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (pollute) target.add(Instruction.loadGlob().locate(loc()));
     }
 
     public GlobalThisStatement(Location loc) {

src/me/topchetoeu/jscript/compilation/values/IndexAssignStatement.java

@@ -1,51 +1,38 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.AssignStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
-public class IndexAssignStatement extends AssignStatement {
+public class IndexAssignStatement extends Statement {
     public final Statement object;
     public final Statement index;
     public final Statement value;
     public final Operation operation;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean retPrevValue) {
-        int start = 0;
-
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (operation != null) {
-            object.compileWithPollution(target, scope);
-            index.compileWithPollution(target, scope);
+            object.compile(target, scope, true);
+            index.compile(target, scope, true);
             target.add(Instruction.dup(2, 0).locate(loc()));
 
             target.add(Instruction.loadMember().locate(loc()));
-            if (retPrevValue) {
-                target.add(Instruction.dup().locate(loc()));
-                target.add(Instruction.move(3, 1).locate(loc()));
-            }
-            value.compileWithPollution(target, scope);
+            value.compile(target, scope, true);
             target.add(Instruction.operation(operation).locate(loc()));
 
-            target.add(Instruction.storeMember(!retPrevValue).locate(loc()).setDebug(true));
+            target.add(Instruction.storeMember(pollute).locate(loc()).setDebug(true));
         }
         else {
-            object.compileWithPollution(target, scope);
-            if (retPrevValue) target.add(Instruction.dup().locate(loc()));
-            index.compileWithPollution(target, scope);
-            value.compileWithPollution(target, scope);
+            object.compile(target, scope, true);
+            index.compile(target, scope, true);
+            value.compile(target, scope, true);
 
-            target.add(Instruction.storeMember(!retPrevValue).locate(loc()).setDebug(true));
+            target.add(Instruction.storeMember(pollute).locate(loc()).setDebug(true));
         }
-        target.get(start);
     }
 
     public IndexAssignStatement(Location loc, Statement object, Statement index, Statement value, Operation operation) {

src/me/topchetoeu/jscript/compilation/values/IndexStatement.java

@@ -1,10 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.AssignStatement;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -14,31 +12,30 @@ public class IndexStatement extends AssignableStatement {
     public final Statement object;
     public final Statement index;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public AssignStatement toAssign(Statement val, Operation operation) {
+    public Statement toAssign(Statement val, Operation operation) {
         return new IndexAssignStatement(loc(), object, index, val, operation);
     }
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean dupObj) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean dupObj, boolean pollute) {
         int start = 0;
-        object.compileWithPollution(target, scope);
+        object.compile(target, scope, true);
         if (dupObj) target.add(Instruction.dup().locate(loc()));
         if (index instanceof ConstantStatement) {
             target.add(Instruction.loadMember(((ConstantStatement)index).value).locate(loc()));
             return;
         }
 
-        index.compileWithPollution(target, scope);
+        index.compile(target, scope, true);
         target.add(Instruction.loadMember().locate(loc()));
         target.get(start).setDebug(true);
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        compile(target, scope, false);
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        compile(target, scope, false, pollute);
     }
 
     public IndexStatement(Location loc, Statement object, Statement index) {

src/me/topchetoeu/jscript/compilation/values/LazyAndStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,29 +10,27 @@ import me.topchetoeu.jscript.engine.values.Values;
 public class LazyAndStatement extends Statement {
     public final Statement first, second;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() {
         return first.pure() && second.pure();
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (first instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)first).value)) {
-                first.compileWithPollution(target, scope);
+                first.compile(target, scope, pollute);
             }
-            else second.compileWithPollution(target, scope);
+            else second.compile(target, scope, pollute);
             return;
         }
 
-        first.compileWithPollution(target, scope);
-        target.add(Instruction.dup().locate(loc()));
+        first.compile(target, scope, true);
+        if (pollute) target.add(Instruction.dup().locate(loc()));
         int start = target.size();
         target.add(Instruction.nop());
         target.add(Instruction.discard().locate(loc()));
-        second.compileWithPollution(target, scope);
+        second.compile(target, scope, pollute);
         target.set(start, Instruction.jmpIfNot(target.size() - start).locate(loc()));
     }
 

src/me/topchetoeu/jscript/compilation/values/LazyOrStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,29 +10,27 @@ import me.topchetoeu.jscript.engine.values.Values;
 public class LazyOrStatement extends Statement {
     public final Statement first, second;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() {
         return first.pure() && second.pure();
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (first instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)first).value)) {
-                second.compileWithPollution(target, scope);
+                second.compile(target, scope, pollute);
             }
-            else first.compileWithPollution(target, scope);
+            else first.compile(target, scope, pollute);
             return;
         }
 
-        first.compileWithPollution(target, scope);
-        target.add(Instruction.dup().locate(loc()));
+        first.compile(target, scope, true);
+        if (pollute) target.add(Instruction.dup().locate(loc()));
         int start = target.size();
         target.add(Instruction.nop());
         target.add(Instruction.discard().locate(loc()));
-        second.compileWithPollution(target, scope);
+        second.compile(target, scope, pollute);
         target.set(start, Instruction.jmpIf(target.size() - start).locate(loc()));
     }
 

src/me/topchetoeu/jscript/compilation/values/NewStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,14 +11,10 @@ public class NewStatement extends Statement {
     public final Statement[] args;
 
     @Override
-    public boolean pollutesStack() { return true; }
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        func.compile(target, scope, true);
 
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        func.compileWithPollution(target, scope);
-        for (var arg : args) {
-            arg.compileWithPollution(target, scope);
-        }
+        for (var arg : args) arg.compile(target, scope, true);
 
         target.add(Instruction.callNew(args.length).locate(loc()).setDebug(true));
     }

src/me/topchetoeu/jscript/compilation/values/ObjectStatement.java

@@ -1,10 +1,10 @@
 package me.topchetoeu.jscript.compilation.values;
 
 import java.util.ArrayList;
-import java.util.List;
 import java.util.Map;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -15,10 +15,7 @@ public class ObjectStatement extends Statement {
     public final Map<Object, FunctionStatement> setters;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadObj().locate(loc()));
 
         for (var el : map.entrySet()) {
@@ -26,7 +23,7 @@ public class ObjectStatement extends Statement {
             target.add(Instruction.loadValue(el.getKey()).locate(loc()));
             var val = el.getValue();
             if (val instanceof FunctionStatement) ((FunctionStatement)val).compile(target, scope, el.getKey().toString(), false);
-            else val.compileWithPollution(target, scope);
+            else val.compile(target, scope, true);
             target.add(Instruction.storeMember().locate(loc()));
         }
 
@@ -38,14 +35,16 @@ public class ObjectStatement extends Statement {
             if (key instanceof String) target.add(Instruction.loadValue((String)key).locate(loc()));
             else target.add(Instruction.loadValue((Double)key).locate(loc()));
 
-            if (getters.containsKey(key)) getters.get(key).compileWithPollution(target, scope);
+            if (getters.containsKey(key)) getters.get(key).compile(target, scope, true);
             else target.add(Instruction.loadValue(null).locate(loc()));
 
-            if (setters.containsKey(key)) setters.get(key).compileWithPollution(target, scope);
+            if (setters.containsKey(key)) setters.get(key).compile(target, scope, true);
             else target.add(Instruction.loadValue(null).locate(loc()));
 
             target.add(Instruction.defProp().locate(loc()));
         }
+
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public ObjectStatement(Location loc, Map<Object, Statement> map, Map<Object, FunctionStatement> getters, Map<Object, FunctionStatement> setters) {

src/me/topchetoeu/jscript/compilation/values/OperationStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.control.ThrowStatement;
@@ -16,15 +15,15 @@ public class OperationStatement extends Statement {
     public final Operation operation;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var arg : args) {
-            arg.compileWithPollution(target, scope);
+            arg.compile(target, scope, true);
         }
-        target.add(Instruction.operation(operation).locate(loc()));
+
+        if (pollute) target.add(Instruction.operation(operation).locate(loc()));
+        else target.add(Instruction.discard().locate(loc()));
     }
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() {
         for (var arg : args) {

src/me/topchetoeu/jscript/compilation/values/RegexStatement.java

@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,14 +9,13 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class RegexStatement extends Statement {
     public final String pattern, flags;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadRegex(pattern, flags).locate(loc()));
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public RegexStatement(Location loc, String pattern, String flags) {

src/me/topchetoeu/jscript/compilation/values/TernaryStatement.java

@@ -1,58 +0,0 @@
-package me.topchetoeu.jscript.compilation.values;
-
-import java.util.List;
-
-import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.Instruction;
-import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
-import me.topchetoeu.jscript.engine.values.Values;
-
-public class TernaryStatement extends Statement {
-    public final Statement condition;
-    public final Statement first;
-    public final Statement second;
-
-    @Override
-    public boolean pollutesStack() { return true; }
-    @Override
-    public boolean pure() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        if (condition instanceof ConstantStatement) {
-            if (!Values.toBoolean(((ConstantStatement)condition).value)) {
-                second.compileWithPollution(target, scope);
-            }
-            else first.compileWithPollution(target, scope);
-            return;
-        }
-
-        condition.compileWithPollution(target, scope);
-        int start = target.size();
-        target.add(Instruction.nop());
-        first.compileWithPollution(target, scope);
-        int mid = target.size();
-        target.add(Instruction.nop());
-        second.compileWithPollution(target, scope);
-        int end = target.size();
-
-        target.set(start, Instruction.jmpIfNot(mid - start + 1).locate(loc()));
-        target.set(mid, Instruction.jmp(end - mid).locate(loc()));
-    }
-
-    @Override
-    public Statement optimize() {
-        var cond = condition.optimize();
-        var f = first.optimize();
-        var s = second.optimize();
-        return new TernaryStatement(loc(), cond, f, s);
-    }
-
-    public TernaryStatement(Location loc, Statement condition, Statement first, Statement second) {
-        super(loc);
-        this.condition = condition;
-        this.first = first;
-        this.second = second;
-    }
-}

src/me/topchetoeu/jscript/compilation/values/TypeofStatement.java

@@ -1,23 +1,21 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.control.ArrayStatement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 import me.topchetoeu.jscript.engine.values.Values;
 
 public class TypeofStatement extends Statement {
     public final Statement value;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (value instanceof VariableStatement) {
             var i = scope.getKey(((VariableStatement)value).name);
             if (i instanceof String) {
@@ -25,7 +23,7 @@ public class TypeofStatement extends Statement {
                 return;
             }
         }
-        value.compileWithPollution(target, scope);
+        value.compile(target, scope, pollute);
         target.add(Instruction.typeof().locate(loc()));
     }
 

src/me/topchetoeu/jscript/compilation/values/VariableAssignStatement.java

@@ -1,39 +1,34 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.compilation.AssignStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.Operation;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
-public class VariableAssignStatement extends AssignStatement {
+public class VariableAssignStatement extends Statement {
     public final String name;
     public final Statement value;
     public final Operation operation;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean retPrevValue) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var i = scope.getKey(name);
         if (operation != null) {
             target.add(Instruction.loadVar(i).locate(loc()));
-            if (retPrevValue) target.add(Instruction.dup().locate(loc()));
             if (value instanceof FunctionStatement) ((FunctionStatement)value).compile(target, scope, name, false);
-            else value.compileWithPollution(target, scope);
+            else value.compile(target, scope, true);
             target.add(Instruction.operation(operation).locate(loc()));
-            target.add(Instruction.storeVar(i, !retPrevValue).locate(loc()));
+            target.add(Instruction.storeVar(i, false).locate(loc()));
         }
         else {
-            if (retPrevValue) target.add(Instruction.loadVar(i).locate(loc()));
             if (value instanceof FunctionStatement) ((FunctionStatement)value).compile(target, scope, name, false);
-            else value.compileWithPollution(target, scope);
-            target.add(Instruction.storeVar(i, !retPrevValue).locate(loc()));
+            else value.compile(target, scope, true);
+            target.add(Instruction.storeVar(i, false).locate(loc()));
         }
+
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     public VariableAssignStatement(Location loc, String name, Statement val, Operation operation) {

src/me/topchetoeu/jscript/compilation/values/VariableIndexStatement.java

@@ -1,23 +1,20 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class VariableIndexStatement extends Statement {
     public final int index;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        target.add(Instruction.loadVar(index).locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (pollute) target.add(Instruction.loadVar(index).locate(loc()));
     }
 
     public VariableIndexStatement(Location loc, int i) {

src/me/topchetoeu/jscript/compilation/values/VariableStatement.java

@@ -1,10 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
-import me.topchetoeu.jscript.compilation.AssignStatement;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -13,20 +11,19 @@ import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 public class VariableStatement extends AssignableStatement {
     public final String name;
 
-    @Override
-    public boolean pollutesStack() { return true; }
     @Override
     public boolean pure() { return true; }
 
     @Override
-    public AssignStatement toAssign(Statement val, Operation operation) {
+    public Statement toAssign(Statement val, Operation operation) {
         return new VariableAssignStatement(loc(), name, val, operation);
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var i = scope.getKey(name);
         target.add(Instruction.loadVar(i).locate(loc()));
+        if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
 
     public VariableStatement(Location loc, String name) {

src/me/topchetoeu/jscript/compilation/values/VoidStatement.java

@@ -1,22 +1,18 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 
 public class VoidStatement extends Statement {
     public final Statement value;
 
     @Override
-    public boolean pollutesStack() { return true; }
-
-    @Override
-    public void compile(List<Instruction> target, ScopeRecord scope) {
-        if (value != null) value.compileNoPollution(target, scope);
-        target.add(Instruction.loadValue(null).locate(loc()));
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
+        if (value != null) value.compile(target, scope, false);
+        if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
 
     @Override

src/me/topchetoeu/jscript/engine/Context.java

@@ -5,16 +5,23 @@ import me.topchetoeu.jscript.engine.values.Values;
 import me.topchetoeu.jscript.parsing.Parsing;
 
 public class Context {
-    public final FunctionContext function;
-    public final MessageContext message;
+    public final Environment env;
+    public final Message message;
 
     public FunctionValue compile(String filename, String raw) throws InterruptedException {
-        var res = Values.toString(this, function.compile.call(this, null, raw, filename));
-        return Parsing.compile(function, filename, res);
+        var res = Values.toString(this, env.compile.call(this, null, raw, filename));
+        return Parsing.compile(message.engine.functions, env, filename, res);
     }
 
-    public Context(FunctionContext funcCtx, MessageContext msgCtx) {
-        this.function = funcCtx;
-        this.message = msgCtx;
+    public Context setEnv(Environment env) {
+        return new Context(env, message);
+    }
+    public Context setMsg(Message msg) {
+        return new Context(env, msg);
+    }
+
+    public Context(Environment env, Message msg) {
+        this.env = env;
+        this.message = msg;
     }
 }

src/me/topchetoeu/jscript/engine/Data.java

@@ -0,0 +1,60 @@
+package me.topchetoeu.jscript.engine;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map.Entry;
+
+@SuppressWarnings("unchecked")
+public class Data implements Iterable<Entry<DataKey<?>, ?>> {
+    private HashMap<DataKey<Object>, Object> data = new HashMap<>();
+
+    public Data copy() {
+        return new Data().addAll(this);
+    }
+
+    public Data addAll(Iterable<Entry<DataKey<?>, ?>> data) {
+        for (var el : data) {
+            add((DataKey<Object>)el.getKey(), (Object)el.getValue());
+        }
+        return this;
+    }
+
+    public <T> Data set(DataKey<T> key, T val) {
+        if (val == null) data.remove(key);
+        else data.put((DataKey<Object>)key, (Object)val);
+        return this;
+    }
+    public <T> T add(DataKey<T> key, T val) {
+        if (data.containsKey(key)) return (T)data.get(key);
+        else {
+            if (val == null) data.remove(key);
+            else data.put((DataKey<Object>)key, (Object)val);
+            return val;
+        }
+    }
+    public <T> T get(DataKey<T> key) {
+        return get(key, null);
+    }
+    public <T> T get(DataKey<T> key, T defaultVal) {
+        if (!has(key)) return defaultVal;
+        else return (T)data.get(key);
+    }
+    public boolean has(DataKey<?> key) { return data.containsKey(key); }
+
+    public int increase(DataKey<Integer> key, int n, int start) {
+        int res;
+        set(key, res = get(key, start) + n);
+        return res;
+    }
+    public int increase(DataKey<Integer> key, int n) {
+        return increase(key, n, 0);
+    }
+    public int increase(DataKey<Integer> key) {
+        return increase(key, 1, 0);
+    }
+
+    @Override
+    public Iterator<Entry<DataKey<?>, ?>> iterator() {
+        return (Iterator<Entry<DataKey<?>, ?>>)data.entrySet();
+    }
+}

src/me/topchetoeu/jscript/engine/DataKey.java

@@ -0,0 +1,3 @@
+package me.topchetoeu.jscript.engine;
+
+public class DataKey<T> { }

src/me/topchetoeu/jscript/engine/Engine.java

@@ -1,7 +1,9 @@
 package me.topchetoeu.jscript.engine;
 
+import java.util.HashMap;
 import java.util.concurrent.LinkedBlockingDeque;
 
+import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.events.Awaitable;
 import me.topchetoeu.jscript.events.DataNotifier;
@@ -11,19 +13,19 @@ public class Engine {
     private class UncompiledFunction extends FunctionValue {
         public final String filename;
         public final String raw;
-        public final FunctionContext ctx;
+        public final Environment env;
 
         @Override
         public Object call(Context ctx, Object thisArg, Object ...args) throws InterruptedException {
-            ctx = new Context(this.ctx, ctx.message);
+            ctx = ctx.setEnv(env);
             return ctx.compile(filename, raw).call(ctx, thisArg, args);
         }
 
-        public UncompiledFunction(FunctionContext ctx, String filename, String raw) {
+        public UncompiledFunction(Environment env, String filename, String raw) {
             super(filename, 0);
             this.filename = filename;
             this.raw = raw;
-            this.ctx = ctx; 
+            this.env = env; 
         }
     }
 
@@ -32,10 +34,10 @@ public class Engine {
         public final Object thisArg;
         public final Object[] args;
         public final DataNotifier<Object> notifier = new DataNotifier<>();
-        public final MessageContext ctx;
+        public final Message msg;
 
-        public Task(MessageContext ctx, FunctionValue func, Object thisArg, Object[] args) {
-            this.ctx = ctx;
+        public Task(Message ctx, FunctionValue func, Object thisArg, Object[] args) {
+            this.msg = ctx;
             this.func = func;
             this.thisArg = thisArg;
             this.args = args;
@@ -49,10 +51,11 @@ public class Engine {
     private LinkedBlockingDeque<Task> microTasks = new LinkedBlockingDeque<>();
 
     public final int id = ++nextId;
+    public final HashMap<Long, Instruction[]> functions = new HashMap<>();
 
     private void runTask(Task task) throws InterruptedException {
         try {
-            task.notifier.next(task.func.call(new Context(null, task.ctx), task.thisArg, task.args));
+            task.notifier.next(task.func.call(task.msg.context(null), task.thisArg, task.args));
         }
         catch (InterruptedException e) {
             task.notifier.error(new RuntimeException(e));
@@ -102,14 +105,14 @@ public class Engine {
         return this.thread != null;
     }
 
-    public Awaitable<Object> pushMsg(boolean micro, MessageContext ctx, FunctionValue func, Object thisArg, Object ...args) {
+    public Awaitable<Object> pushMsg(boolean micro, Message ctx, FunctionValue func, Object thisArg, Object ...args) {
         var msg = new Task(ctx, func, thisArg, args);
         if (micro) microTasks.addLast(msg);
         else macroTasks.addLast(msg);
         return msg.notifier;
     }
     public Awaitable<Object> pushMsg(boolean micro, Context ctx, String filename, String raw, Object thisArg, Object ...args) {
-        return pushMsg(micro, ctx.message, new UncompiledFunction(ctx.function, filename, raw), thisArg, args);
+        return pushMsg(micro, ctx.message, new UncompiledFunction(ctx.env, filename, raw), thisArg, args);
     }
 
     // public Engine() {

src/me/topchetoeu/jscript/engine/Environment.java

@@ -0,0 +1,84 @@
+package me.topchetoeu.jscript.engine;
+
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.engine.scope.GlobalScope;
+import me.topchetoeu.jscript.engine.values.FunctionValue;
+import me.topchetoeu.jscript.engine.values.NativeFunction;
+import me.topchetoeu.jscript.engine.values.ObjectValue;
+import me.topchetoeu.jscript.engine.values.Symbol;
+import me.topchetoeu.jscript.exceptions.EngineException;
+import me.topchetoeu.jscript.interop.Native;
+import me.topchetoeu.jscript.interop.NativeGetter;
+import me.topchetoeu.jscript.interop.NativeSetter;
+import me.topchetoeu.jscript.interop.NativeWrapperProvider;
+
+public class Environment {
+    private HashMap<String, ObjectValue> prototypes = new HashMap<>();
+
+    public final Data data = new Data();
+    public final HashMap<String, Symbol> symbols = new HashMap<>();
+
+    public GlobalScope global;
+    public WrappersProvider wrappersProvider;
+
+    @Native public FunctionValue compile;
+    @Native public FunctionValue regexConstructor = new NativeFunction("RegExp", (ctx, thisArg, args) -> {
+        throw EngineException.ofError("Regular expressions not supported.").setContext(ctx);
+    });
+
+    public Environment addData(Data data) {
+        this.data.addAll(data);
+        return this;
+    }
+
+    @Native public ObjectValue proto(String name) {
+        return prototypes.get(name);
+    }
+    @Native public void setProto(String name, ObjectValue val) {
+        prototypes.put(name, val);
+    }
+
+    @Native public Symbol symbol(String name) {
+        if (symbols.containsKey(name))
+            return symbols.get(name);
+        else {
+            var res = new Symbol(name);
+            symbols.put(name, res);
+            return res;
+        }
+    }
+
+    @NativeGetter("global") public ObjectValue getGlobal() {
+        return global.obj;
+    }
+    @NativeSetter("global") public void setGlobal(ObjectValue val) {
+        global = new GlobalScope(val);
+    }
+
+    @Native public Environment fork() {
+        var res = new Environment(compile, wrappersProvider, global);
+        res.regexConstructor = regexConstructor;
+        res.prototypes = new HashMap<>(prototypes);
+        return res;
+    }
+    @Native public Environment child() {
+        var res = fork();
+        res.global = res.global.globalChild();
+        return res;
+    }
+
+    public Context context(Message msg) {
+        return new Context(this, msg);
+    }
+
+    public Environment(FunctionValue compile, WrappersProvider nativeConverter, GlobalScope global) {
+        if (compile == null) compile = new NativeFunction("compile", (ctx, thisArg, args) -> args.length == 0 ? "" : args[0]);
+        if (nativeConverter == null) nativeConverter = new NativeWrapperProvider(this);
+        if (global == null) global = new GlobalScope();
+
+        this.wrappersProvider = nativeConverter;
+        this.compile = compile;
+        this.global = global;
+    }
+}

src/me/topchetoeu/jscript/engine/FunctionContext.java

@@ -1,81 +0,0 @@
-package me.topchetoeu.jscript.engine;
-
-import java.util.HashMap;
-
-import me.topchetoeu.jscript.engine.scope.GlobalScope;
-import me.topchetoeu.jscript.engine.values.FunctionValue;
-import me.topchetoeu.jscript.engine.values.NativeFunction;
-import me.topchetoeu.jscript.engine.values.ObjectValue;
-import me.topchetoeu.jscript.exceptions.EngineException;
-import me.topchetoeu.jscript.interop.Native;
-import me.topchetoeu.jscript.interop.NativeGetter;
-import me.topchetoeu.jscript.interop.NativeSetter;
-
-public class FunctionContext {
-    private HashMap<String, ObjectValue> prototypes = new HashMap<>();
-    public GlobalScope global;
-    public WrappersProvider wrappersProvider;
-
-    @Native public FunctionValue compile;
-    @Native public FunctionValue regexConstructor = new NativeFunction("RegExp", (ctx, thisArg, args) -> {
-        throw EngineException.ofError("Regular expressions not supported.");
-    });
-    @Native public ObjectValue proto(String name) {
-        return prototypes.get(name);
-    }
-    @Native public void setProto(String name, ObjectValue val) {
-        prototypes.put(name, val);
-    }
-    // @Native public ObjectValue arrayPrototype = new ObjectValue();
-    // @Native public ObjectValue boolPrototype = new ObjectValue();
-    // @Native public ObjectValue functionPrototype = new ObjectValue();
-    // @Native public ObjectValue numberPrototype = new ObjectValue();
-    // @Native public ObjectValue objectPrototype = new ObjectValue(PlaceholderProto.NONE);
-    // @Native public ObjectValue stringPrototype = new ObjectValue();
-    // @Native public ObjectValue symbolPrototype = new ObjectValue();
-    // @Native public ObjectValue errorPrototype = new ObjectValue();
-    // @Native public ObjectValue syntaxErrPrototype = new ObjectValue(PlaceholderProto.ERROR);
-    // @Native public ObjectValue typeErrPrototype = new ObjectValue(PlaceholderProto.ERROR);
-    // @Native public ObjectValue rangeErrPrototype = new ObjectValue(PlaceholderProto.ERROR);
-
-    @NativeGetter("global")
-    public ObjectValue getGlobal() {
-        return global.obj;
-    }
-    @NativeSetter("global")
-    public void setGlobal(ObjectValue val) {
-        global = new GlobalScope(val);
-    }
-
-    @Native
-    public FunctionContext fork() {
-        var res = new FunctionContext(compile, wrappersProvider, global);
-        res.regexConstructor = regexConstructor;
-        res.prototypes = new HashMap<>(prototypes);
-        return res;
-    }
-
-    @Native
-    public FunctionContext child() {
-        var res = fork();
-        res.global = res.global.globalChild();
-        return res;
-    }
-
-    public FunctionContext(FunctionValue compile, WrappersProvider nativeConverter, GlobalScope global) {
-        if (compile == null) compile = new NativeFunction("compile", (ctx, thisArg, args) -> args.length == 0 ? "" : args[0]);
-        if (nativeConverter == null) nativeConverter = new WrappersProvider() {
-            public ObjectValue getConstr(Class<?> obj) {
-                throw EngineException.ofType("Java objects not passable to Javascript.");
-            }
-            public ObjectValue getProto(Class<?> obj) {
-                throw EngineException.ofType("Java objects not passable to Javascript.");
-            }
-        };
-        if (global == null) global = new GlobalScope();
-
-        this.wrappersProvider = nativeConverter;
-        this.compile = compile;
-        this.global = global;
-    }
-}

src/me/topchetoeu/jscript/engine/Message.java

@@ -7,15 +7,22 @@ import java.util.List;
 import me.topchetoeu.jscript.engine.frame.CodeFrame;
 import me.topchetoeu.jscript.exceptions.EngineException;
 
-public class MessageContext {
+public class Message {
     public final Engine engine;
 
     private final ArrayList<CodeFrame> frames = new ArrayList<>();
     public int maxStackFrames = 1000;
 
+    public final Data data = new Data();
+
     public List<CodeFrame> frames() { return Collections.unmodifiableList(frames); }
 
-    public MessageContext pushFrame(CodeFrame frame) {
+    public Message addData(Data data) {
+        this.data.addAll(data);
+        return this;
+    }
+
+    public Message pushFrame(Context ctx, CodeFrame frame) throws InterruptedException {
         this.frames.add(frame);
         if (this.frames.size() > maxStackFrames) throw EngineException.ofRange("Stack overflow!");
         return this;
@@ -27,7 +34,30 @@ public class MessageContext {
         return true;
     }
 
-    public MessageContext(Engine engine) {
+    public List<String> stackTrace() {
+        var res = new ArrayList<String>();
+
+        for (var el : frames) {
+            var name = el.function.name;
+            var loc = el.function.loc();
+            var trace = "";
+
+            if (loc != null) trace += "at " + loc.toString() + " ";
+            if (name != null && !name.equals("")) trace += "in " + name + " ";
+
+            trace = trace.trim();
+
+            if (!res.equals("")) res.add(trace);
+        }
+
+        return res;
+    }
+
+    public Context context(Environment env) {
+        return new Context(env, this);
+    }
+
+    public Message(Engine engine) {
         this.engine = engine;
     }
 }

src/me/topchetoeu/jscript/engine/WrappersProvider.java

@@ -1,8 +1,9 @@
 package me.topchetoeu.jscript.engine;
 
+import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.engine.values.ObjectValue;
 
 public interface WrappersProvider {
     public ObjectValue getProto(Class<?> obj);
-    public ObjectValue getConstr(Class<?> obj);
+    public FunctionValue getConstr(Class<?> obj);
 }

src/me/topchetoeu/jscript/engine/frame/CodeFrame.java

@@ -1,7 +1,6 @@
 package me.topchetoeu.jscript.engine.frame;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Stack;
 
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.engine.Context;
@@ -9,6 +8,7 @@ import me.topchetoeu.jscript.engine.scope.LocalScope;
 import me.topchetoeu.jscript.engine.scope.ValueVariable;
 import me.topchetoeu.jscript.engine.values.ArrayValue;
 import me.topchetoeu.jscript.engine.values.CodeFunction;
+import me.topchetoeu.jscript.engine.values.ObjectValue;
 import me.topchetoeu.jscript.engine.values.Values;
 import me.topchetoeu.jscript.exceptions.EngineException;
 
@@ -24,8 +24,8 @@ public class CodeFrame {
         public final int tryStart, catchStart, finallyStart, end;
         public int state;
         public Object retVal;
-        public int jumpPtr;
         public EngineException err;
+        public int jumpPtr;
 
         public TryCtx(int tryStart, int tryN, int catchN, int finallyN) {
             hasCatch = catchN >= 0;
@@ -45,7 +45,7 @@ public class CodeFrame {
     public final LocalScope scope;
     public final Object thisArg;
     public final Object[] args;
-    public final List<TryCtx> tryStack = new ArrayList<>();
+    public final Stack<TryCtx> tryStack = new Stack<>();
     public final CodeFunction function;
 
     public Object[] stack = new Object[32];
@@ -93,6 +93,12 @@ public class CodeFrame {
         stack[stackPtr++] = Values.normalize(ctx, val);
     }
 
+    private void setCause(Context ctx, EngineException err, EngineException cause) throws InterruptedException {
+        if (err.value instanceof ObjectValue) {
+            Values.setMember(ctx, err, ctx.env.symbol("Symbol.cause"), cause);
+        }
+        err.cause = cause;
+    }
     private Object nextNoTry(Context ctx) throws InterruptedException {
         if (Thread.currentThread().isInterrupted()) throw new InterruptedException();
         if (codePtr < 0 || codePtr >= function.body.length) return null;
@@ -107,163 +113,125 @@ public class CodeFrame {
             return Runners.exec(ctx, instr, this);
         }
         catch (EngineException e) {
-            throw e.add(function.name, prevLoc);
+            throw e.add(function.name, prevLoc).setContext(ctx);
         }
     }
 
-    public Object next(Context ctx, Object prevReturn, Object prevError) throws InterruptedException {
-        TryCtx tryCtx = null;
-        if (prevError != Runners.NO_RETURN) prevReturn = Runners.NO_RETURN;
+    public Object next(Context ctx, Object value, Object returnValue, EngineException error) throws InterruptedException {
+        if (value != Runners.NO_RETURN) push(ctx, value);
 
-        while (!tryStack.isEmpty()) {
-            var tmp = tryStack.get(tryStack.size() - 1);
-            var remove = false;
-
-            if (prevError != Runners.NO_RETURN) {
-                remove = true;
-                if (tmp.state == TryCtx.STATE_TRY) {
-                    tmp.jumpPtr = tmp.end;
-
-                    if (tmp.hasCatch) {
-                        tmp.state = TryCtx.STATE_CATCH;
-                        scope.catchVars.add(new ValueVariable(false, prevError));
-                        prevError = Runners.NO_RETURN;
-                        codePtr = tmp.catchStart;
-                        remove = false;
-                    }
-                    else if (tmp.hasFinally) {
-                        tmp.state = TryCtx.STATE_FINALLY_THREW;
-                        tmp.err = new EngineException(prevError);
-                        prevError = Runners.NO_RETURN;
-                        codePtr = tmp.finallyStart;
-                        remove = false;
-                    }
-                }
-            }
-            else if (prevReturn != Runners.NO_RETURN) {
-                remove = true;
-                if (tmp.hasFinally && tmp.state <= TryCtx.STATE_CATCH) {
-                    tmp.state = TryCtx.STATE_FINALLY_RETURNED;
-                    tmp.retVal = prevReturn;
-                    prevReturn = Runners.NO_RETURN;
-                    codePtr = tmp.finallyStart;
-                    remove = false;
-                }
-            }
-            else if (tmp.state == TryCtx.STATE_TRY) {
-                if (codePtr < tmp.tryStart || codePtr >= tmp.catchStart) {
-                    if (jumpFlag) tmp.jumpPtr = codePtr;
-                    else tmp.jumpPtr = tmp.end;
-
-                    if (tmp.hasFinally) {
-                        tmp.state = TryCtx.STATE_FINALLY_JUMPED;
-                        codePtr = tmp.finallyStart;
-                    }
-                    else codePtr = tmp.jumpPtr;
-                    remove = !tmp.hasFinally;
-                }
-            }
-            else if (tmp.state == TryCtx.STATE_CATCH) {
-                if (codePtr < tmp.catchStart || codePtr >= tmp.finallyStart) {
-                    if (jumpFlag) tmp.jumpPtr = codePtr;
-                    else tmp.jumpPtr = tmp.end;
-                    scope.catchVars.remove(scope.catchVars.size() - 1);
-
-                    if (tmp.hasFinally) {
-                        tmp.state = TryCtx.STATE_FINALLY_JUMPED;
-                        codePtr = tmp.finallyStart;
-                    }
-                    else codePtr = tmp.jumpPtr;
-                    remove = !tmp.hasFinally;
-                }
-            }
-            else if (codePtr < tmp.finallyStart || codePtr >= tmp.end) {
-                if (!jumpFlag) {
-                    if (tmp.state == TryCtx.STATE_FINALLY_THREW) throw tmp.err;
-                    else if (tmp.state == TryCtx.STATE_FINALLY_RETURNED) return tmp.retVal;
-                    else if (tmp.state == TryCtx.STATE_FINALLY_JUMPED) codePtr = tmp.jumpPtr;
-                }
-                else codePtr = tmp.jumpPtr;
-                remove = true;
-            }
-
-            if (remove) tryStack.remove(tryStack.size() - 1);
-            else {
-                tryCtx = tmp;
-                break;
-            }
+        if (returnValue == Runners.NO_RETURN && error == null) {
+            try { returnValue = nextNoTry(ctx); }
+            catch (EngineException e) { error = e; }
         }
 
-        if (prevError != Runners.NO_RETURN) throw new EngineException(prevError);
-        if (prevReturn != Runners.NO_RETURN) return prevReturn;
+        while (!tryStack.empty()) {
+            var tryCtx = tryStack.peek();
+            var newState = -1;
 
-        if (tryCtx == null) return nextNoTry(ctx);
-        else if (tryCtx.state == TryCtx.STATE_TRY) {
-            try {
-                var res = nextNoTry(ctx);
-                if (res != Runners.NO_RETURN && tryCtx.hasFinally) {
-                    tryCtx.retVal = res;
-                    tryCtx.state = TryCtx.STATE_FINALLY_RETURNED;
-                }
+            switch (tryCtx.state) {
+                case TryCtx.STATE_TRY:
+                    if (error != null) {
+                        if (tryCtx.hasCatch) {
+                            tryCtx.err = error;
+                            newState = TryCtx.STATE_CATCH;
+                        }
+                        else if (tryCtx.hasFinally) {
+                            tryCtx.err = error;
+                            newState = TryCtx.STATE_FINALLY_THREW;
+                        }
+                        break;
+                    }
+                    else if (returnValue != Runners.NO_RETURN) {
+                        if (tryCtx.hasFinally) {
+                            tryCtx.retVal = error;
+                            newState = TryCtx.STATE_FINALLY_RETURNED;
+                        }
+                        break;
+                    }
+                    else if (codePtr >= tryCtx.tryStart && codePtr < tryCtx.catchStart) return Runners.NO_RETURN;
 
-                else return res;
+                    if (tryCtx.hasFinally) {
+                        if (jumpFlag) tryCtx.jumpPtr = codePtr;
+                        else tryCtx.jumpPtr = tryCtx.end;
+                        newState = TryCtx.STATE_FINALLY_JUMPED;
+                    }
+                    else codePtr = tryCtx.end;
+                    break;
+                case TryCtx.STATE_CATCH:
+                    if (error != null) {
+                        if (tryCtx.hasFinally) {
+                            tryCtx.err = error;
+                            newState = TryCtx.STATE_FINALLY_THREW;
+                        }
+                        break;
+                    }
+                    else if (returnValue != Runners.NO_RETURN) {
+                        if (tryCtx.hasFinally) {
+                            tryCtx.retVal = returnValue;
+                            newState = TryCtx.STATE_FINALLY_RETURNED;
+                        }
+                        break;
+                    }
+                    else if (codePtr >= tryCtx.catchStart && codePtr < tryCtx.finallyStart) return Runners.NO_RETURN;
+
+                    if (tryCtx.hasFinally) {
+                        if (jumpFlag) tryCtx.jumpPtr = codePtr;
+                        else tryCtx.jumpPtr = tryCtx.end;
+                        newState = TryCtx.STATE_FINALLY_JUMPED;
+                    }
+                    else codePtr = tryCtx.end;
+                    break;
+                case TryCtx.STATE_FINALLY_THREW:
+                    if (error != null) setCause(ctx, error, tryCtx.err);
+                    else if (codePtr < tryCtx.finallyStart || codePtr >= tryCtx.end) error = tryCtx.err;
+                    else return Runners.NO_RETURN;
+                    break;
+                case TryCtx.STATE_FINALLY_RETURNED:
+                    if (returnValue == Runners.NO_RETURN) {
+                        if (codePtr < tryCtx.finallyStart || codePtr >= tryCtx.end) returnValue = tryCtx.retVal;
+                        else return Runners.NO_RETURN;
+                    }
+                    break;
+                case TryCtx.STATE_FINALLY_JUMPED:
+                    if (codePtr < tryCtx.finallyStart || codePtr >= tryCtx.end) {
+                        if (!jumpFlag) codePtr = tryCtx.jumpPtr;
+                        else codePtr = tryCtx.end;
+                    }
+                    else return Runners.NO_RETURN;
+                    break;
             }
-            catch (EngineException e) {
-                if (tryCtx.hasCatch) {
-                    tryCtx.state = TryCtx.STATE_CATCH;
-                    tryCtx.err = e;
+
+            if (tryCtx.state == TryCtx.STATE_CATCH) scope.catchVars.remove(scope.catchVars.size() - 1);
+
+            if (newState == -1) {
+                tryStack.pop();
+                continue;
+            }
+
+            tryCtx.state = newState;
+            switch (newState) {
+                case TryCtx.STATE_CATCH:
+                    scope.catchVars.add(new ValueVariable(false, tryCtx.err.value));
                     codePtr = tryCtx.catchStart;
-                    scope.catchVars.add(new ValueVariable(false, e.value));
-                    return Runners.NO_RETURN;
-                }
-                else if (tryCtx.hasFinally) {
-                    tryCtx.err = e;
-                    tryCtx.state = TryCtx.STATE_FINALLY_THREW;
-                }
-                else throw e;
+                    break;
+                default:
+                    codePtr = tryCtx.finallyStart;
             }
 
-            codePtr = tryCtx.finallyStart;
             return Runners.NO_RETURN;
         }
-        else if (tryCtx.state == TryCtx.STATE_CATCH) {
-            try {
-                var res = nextNoTry(ctx);
-                if (res != Runners.NO_RETURN && tryCtx.hasFinally) {
-                    tryCtx.retVal = res;
-                    tryCtx.state = TryCtx.STATE_FINALLY_RETURNED;
-                }
-                else return res;
-            }
-            catch (EngineException e) {
-                e.cause = tryCtx.err;
-                if (tryCtx.hasFinally) {
-                    tryCtx.err = e;
-                    tryCtx.state = TryCtx.STATE_FINALLY_THREW;
-                }
-                else throw e;
-            }
-
-            codePtr = tryCtx.finallyStart;
-            return Runners.NO_RETURN;
-        }
-        else if (tryCtx.state == TryCtx.STATE_FINALLY_THREW) {
-            try {
-                return nextNoTry(ctx);
-            }
-            catch (EngineException e) {
-                e.cause = tryCtx.err;
-                throw e;
-            }
-        }
-        else return nextNoTry(ctx);
+    
+        if (error != null) throw error.setContext(ctx);
+        if (returnValue != Runners.NO_RETURN) return returnValue;
+        return Runners.NO_RETURN;
     }
 
     public Object run(Context ctx) throws InterruptedException {
         try {
-            ctx.message.pushFrame(this);
+            ctx.message.pushFrame(ctx, this);
             while (true) {
-                var res = next(ctx, Runners.NO_RETURN, Runners.NO_RETURN);
+                var res = next(ctx, Runners.NO_RETURN, Runners.NO_RETURN, null);
                 if (res != Runners.NO_RETURN) return res;
             }
         }

src/me/topchetoeu/jscript/engine/frame/Runners.java

@@ -9,7 +9,6 @@ import me.topchetoeu.jscript.engine.scope.ValueVariable;
 import me.topchetoeu.jscript.engine.values.ArrayValue;
 import me.topchetoeu.jscript.engine.values.CodeFunction;
 import me.topchetoeu.jscript.engine.values.ObjectValue;
-import me.topchetoeu.jscript.engine.values.SignalValue;
 import me.topchetoeu.jscript.engine.values.Symbol;
 import me.topchetoeu.jscript.engine.values.Values;
 import me.topchetoeu.jscript.exceptions.EngineException;
@@ -20,13 +19,10 @@ public class Runners {
     public static Object execReturn(Context ctx, Instruction instr, CodeFrame frame) {
         return frame.pop();
     }
-    public static Object execSignal(Context ctx, Instruction instr, CodeFrame frame) {
-        return new SignalValue(instr.get(0));
-    }
     public static Object execThrow(Context ctx, Instruction instr, CodeFrame frame) {
         throw new EngineException(frame.pop());
     }
-    public static Object execThrowSyntax(Context ctx, Instruction instr, CodeFrame frame) {
+    public static Object execThrowSyntax(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
         throw EngineException.ofSyntax((String)instr.get(0));
     }
 
@@ -48,16 +44,18 @@ public class Runners {
         var callArgs = frame.take(instr.get(0));
         var funcObj = frame.pop();
 
-        if (Values.isFunction(funcObj) && Values.function(funcObj).special) {
-            frame.push(ctx, call(ctx, funcObj, null, callArgs));
-        }
-        else {
-            var proto = Values.getMember(ctx, funcObj, "prototype");
-            var obj = new ObjectValue();
-            obj.setPrototype(ctx, proto);
-            call(ctx, funcObj, obj, callArgs);
-            frame.push(ctx, obj);
-        }
+        frame.push(ctx, Values.callNew(ctx, funcObj, callArgs));
+
+        // if (Values.isFunction(funcObj) && Values.function(funcObj).special) {
+        //     frame.push(ctx, call(ctx, funcObj, null, callArgs));
+        // }
+        // else {
+        //     var proto = Values.getMember(ctx, funcObj, "prototype");
+        //     var obj = new ObjectValue();
+        //     obj.setPrototype(ctx, proto);
+        //     call(ctx, funcObj, obj, callArgs);
+        //     frame.push(ctx, obj);
+        // }
 
         frame.codePtr++;
         return NO_RETURN;
@@ -65,7 +63,7 @@ public class Runners {
 
     public static Object execMakeVar(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
         var name = (String)instr.get(0);
-        ctx.function.global.define(name);
+        ctx.env.global.define(name);
         frame.codePtr++;
         return NO_RETURN;
     }
@@ -160,7 +158,7 @@ public class Runners {
     public static Object execLoadVar(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
         var i = instr.get(0);
 
-        if (i instanceof String) frame.push(ctx, ctx.function.global.get(ctx, (String)i));
+        if (i instanceof String) frame.push(ctx, ctx.env.global.get(ctx, (String)i));
         else frame.push(ctx, frame.scope.get((int)i).get(ctx));
 
         frame.codePtr++;
@@ -172,7 +170,7 @@ public class Runners {
         return NO_RETURN;
     }
     public static Object execLoadGlob(Context ctx, Instruction instr, CodeFrame frame) {
-        frame.push(ctx, ctx.function.global.obj);
+        frame.push(ctx, ctx.env.global.obj);
         frame.codePtr++;
         return NO_RETURN;
     }
@@ -184,7 +182,7 @@ public class Runners {
         return NO_RETURN;
     }
     public static Object execLoadFunc(Context ctx, Instruction instr, CodeFrame frame) {
-        int n = (Integer)instr.get(0);
+        long id = (Long)instr.get(0);
         int localsN = (Integer)instr.get(1);
         int len = (Integer)instr.get(2);
         var captures = new ValueVariable[instr.params.length - 3];
@@ -193,15 +191,12 @@ public class Runners {
             captures[i - 3] = frame.scope.get(instr.get(i));
         }
 
-        var start = frame.codePtr + 1;
-        var end = start + n - 1;
-        var body = new Instruction[end - start];
-        System.arraycopy(frame.function.body, start, body, 0, end - start);
+        var body = ctx.message.engine.functions.get(id);
+        var func = new CodeFunction(ctx.env, "", localsN, len, captures, body);
 
-        var func = new CodeFunction(ctx.function, "", localsN, len, captures, body);
         frame.push(ctx, func);
 
-        frame.codePtr += n;
+        frame.codePtr++;
         return NO_RETURN;
     }
     public static Object execLoadMember(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
@@ -222,7 +217,7 @@ public class Runners {
         return execLoadMember(ctx, instr, frame);
     }
     public static Object execLoadRegEx(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
-        frame.push(ctx, ctx.function.regexConstructor.call(ctx, null, instr.get(0), instr.get(1)));
+        frame.push(ctx, ctx.env.regexConstructor.call(ctx, null, instr.get(0), instr.get(1)));
         frame.codePtr++;
         return NO_RETURN;
     }
@@ -246,7 +241,7 @@ public class Runners {
         var val = (boolean)instr.get(1) ? frame.peek() : frame.pop();
         var i = instr.get(0);
 
-        if (i instanceof String) ctx.function.global.set(ctx, (String)i, val);
+        if (i instanceof String) ctx.env.global.set(ctx, (String)i, val);
         else frame.scope.get((int)i).set(ctx, val);
 
         frame.codePtr++;
@@ -293,8 +288,8 @@ public class Runners {
         Object obj;
 
         if (name != null) {
-            if (ctx.function.global.has(ctx, name)) {
-                obj = ctx.function.global.get(ctx, name);
+            if (ctx.env.global.has(ctx, name)) {
+                obj = ctx.env.global.get(ctx, name);
             }
             else obj = null;
         }
@@ -305,7 +300,7 @@ public class Runners {
         frame.codePtr++;
         return NO_RETURN;
     }
-    public static Object execNop(Context ctx, Instruction instr, CodeFrame frame) {
+    public static Object execNop(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
         if (instr.is(0, "dbg_names")) {
             var names = new String[instr.params.length - 1];
             for (var i = 0; i < instr.params.length - 1; i++) {
@@ -341,11 +336,9 @@ public class Runners {
     }
 
     public static Object exec(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
-        // System.out.println(instr + "@" + instr.location);
         switch (instr.type) {
             case NOP: return execNop(ctx, instr, frame);
             case RETURN: return execReturn(ctx, instr, frame);
-            case SIGNAL: return execSignal(ctx, instr, frame);
             case THROW: return execThrow(ctx, instr, frame);
             case THROW_SYNTAX: return execThrowSyntax(ctx, instr, frame);
             case CALL: return execCall(ctx, instr, frame);

src/me/topchetoeu/jscript/engine/scope/LocalScope.java

@@ -9,7 +9,8 @@ public class LocalScope {
     public final ArrayList<ValueVariable> catchVars = new ArrayList<>();
 
     public ValueVariable get(int i) {
-        if (i >= locals.length) return catchVars.get(i - locals.length);
+        if (i >= locals.length)
+            return catchVars.get(i - locals.length);
         if (i >= 0) return locals[i];
         else return captures[~i];
     }

src/me/topchetoeu/jscript/engine/values/ArrayValue.java

@@ -1,90 +1,128 @@
 package me.topchetoeu.jscript.engine.values;
 
-import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Comparator;
+import java.util.Iterator;
 import java.util.List;
 
 import me.topchetoeu.jscript.engine.Context;
 
-public class ArrayValue extends ObjectValue {
-    private static final Object EMPTY = new Object();
-    private final ArrayList<Object> values = new ArrayList<>();
+// TODO: Make methods generic
+public class ArrayValue extends ObjectValue implements Iterable<Object> {
+    private static final Object UNDEFINED = new Object();
+    private Object[] values;
+    private int size;
 
-    public int size() { return values.size(); }
+    private void alloc(int index) {
+        if (index < values.length) return;
+        if (index < values.length * 2) index = values.length * 2;
+
+        var arr = new Object[index];
+        System.arraycopy(values, 0, arr, 0, values.length);
+        values = arr;
+    }
+
+    public int size() { return size; }
     public boolean setSize(int val) {
         if (val < 0) return false;
-        while (size() > val) {
-            values.remove(values.size() - 1);
-        }
-        while (size() < val) {
-            values.add(EMPTY);
+        if (size > val) shrink(size - val);
+        else {
+            alloc(val);
+            size = val;
         }
         return true;
     }
 
     public Object get(int i) {
-        if (i < 0 || i >= values.size()) return null;
-        var res = values.get(i);
-        if (res == EMPTY) return null;
+        if (i < 0 || i >= size) return null;
+        var res = values[i];
+        if (res == UNDEFINED) return null;
         else return res;
     }
     public void set(Context ctx, int i, Object val) {
         if (i < 0) return;
 
-        while (values.size() <= i) {
-            values.add(EMPTY);
-        }
+        alloc(i);
 
-        values.set(i, Values.normalize(ctx, val));
+        val = Values.normalize(ctx, val);
+        if (val == null) val = UNDEFINED;
+        values[i] = val;
+        if (i >= size) size = i + 1;
     }
     public boolean has(int i) {
-        return i >= 0 && i < values.size() && values.get(i) != EMPTY;
+        return i >= 0 && i < values.length && values[i] != null;
     }
     public void remove(int i) {
-        if (i < 0 || i >= values.size()) return;
-        values.set(i, EMPTY);
+        if (i < 0 || i >= values.length) return;
+        values[i] = null;
     }
     public void shrink(int n) {
-        if (n > values.size()) values.clear();
+        if (n >= values.length) {
+            values = new Object[16];
+            size = 0;
+        }
         else {
-            for (int i = 0; i < n && values.size() > 0; i++) {
-                values.remove(values.size() - 1);
+            for (int i = 0; i < n; i++) {
+                values[--size] = null;
             }
         }
     }
 
+    public Object[] toArray() {
+        Object[] res = new Object[size];
+        copyTo(res, 0, 0, size);
+        return res;
+    }
+    public void copyTo(Object[] arr, int sourceStart, int destStart, int count) {
+        for (var i = 0; i < count; i++) {
+            if (i + sourceStart < 0 || i + sourceStart >= size) arr[i + destStart] = null;
+            if (values[i + sourceStart] == UNDEFINED) arr[i + destStart] = null;
+            else arr[i + sourceStart] = values[i + destStart];
+        }
+    }
+    public void copyTo(Context ctx, ArrayValue arr, int sourceStart, int destStart, int count) {
+        // Iterate in reverse to reallocate at most once
+        for (var i = count - 1; i >= 0; i--) {
+            if (i + sourceStart < 0 || i + sourceStart >= size) arr.set(ctx, i + destStart, null);
+            if (values[i + sourceStart] == UNDEFINED) arr.set(ctx, i + destStart, null);
+            else arr.set(ctx, i + destStart, values[i + sourceStart]);
+        }
+    }
+
+    public void copyFrom(Context ctx, Object[] arr, int sourceStart, int destStart, int count) {
+        for (var i = 0; i < count; i++) {
+            set(ctx, i + destStart, arr[i + sourceStart]);
+        }
+    }
+
+    public void move(int srcI, int dstI, int n) {
+        alloc(dstI + n);
+
+        System.arraycopy(values, srcI, values, dstI, n);
+
+        if (dstI + n >= size) size = dstI + n;
+    }
+
     public void sort(Comparator<Object> comparator) {
-        values.sort((a, b) -> {
+        Arrays.sort(values, 0, size, (a, b) -> {
             var _a = 0;
             var _b = 0;
 
-            if (a == null) _a = 1;
-            if (a == EMPTY) _a = 2;
+            if (a == UNDEFINED) _a = 1;
+            if (a == null) _a = 2;
 
-            if (b == null) _b = 1;
-            if (b == EMPTY) _b = 2;
+            if (b == UNDEFINED) _b = 1;
+            if (b == null) _b = 2;
 
-            if (Integer.compare(_a, _b) != 0) return Integer.compare(_a, _b);
+            if (_a != 0 || _b != 0) return Integer.compare(_a, _b);
 
             return comparator.compare(a, b);
         });
     }
 
-    public Object[] toArray() {
-        Object[] res = new Object[values.size()];
-
-        for (var i = 0; i < values.size(); i++) {
-            if (values.get(i) == EMPTY) res[i] = null;
-            else res[i] = values.get(i);
-        }
-
-        return res;
-    }
-
     @Override
     protected Object getField(Context ctx, Object key) throws InterruptedException {
-        if (key.equals("length")) return values.size();
         if (key instanceof Number) {
             var i = ((Number)key).doubleValue();
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -96,9 +134,6 @@ public class ArrayValue extends ObjectValue {
     }
     @Override
     protected boolean setField(Context ctx, Object key, Object val) throws InterruptedException {
-        if (key.equals("length")) {
-            return setSize((int)Values.toNumber(ctx, val));
-        }
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -111,7 +146,6 @@ public class ArrayValue extends ObjectValue {
     }
     @Override
     protected boolean hasField(Context ctx, Object key) throws InterruptedException {
-        if (key.equals("length")) return true;
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -140,18 +174,42 @@ public class ArrayValue extends ObjectValue {
         for (var i = 0; i < size(); i++) {
             if (has(i)) res.add(i);
         }
-        if (includeNonEnumerable) res.add("length");
         return res;
     }
 
+    @Override
+    public Iterator<Object> iterator() {
+        return new Iterator<Object>() {
+            private int i = 0;
+
+            @Override
+            public boolean hasNext() {
+                return i < size();
+            }
+            @Override
+            public Object next() {
+                if (!hasNext()) return null;
+                return get(i++);
+            }
+        };
+    }
+
     public ArrayValue() {
         super(PlaceholderProto.ARRAY);
-        nonEnumerableSet.add("length");
-        nonConfigurableSet.add("length");
+        values = new Object[16];
+        size = 0;
+    }
+    public ArrayValue(int cap) {
+        super(PlaceholderProto.ARRAY);
+        values = new Object[cap];
+        size = 0;
     }
     public ArrayValue(Context ctx, Object ...values) {
         this();
-        for (var i = 0; i < values.length; i++) this.values.add(Values.normalize(ctx, values[i]));
+        this.values = new Object[values.length];
+        size = values.length;
+
+        for (var i = 0; i < size; i++) this.values[i] = Values.normalize(ctx, values[i]);
     }
 
     public static ArrayValue of(Context ctx, Collection<Object> values) {

src/me/topchetoeu/jscript/engine/values/CodeFunction.java

@@ -3,7 +3,7 @@ package me.topchetoeu.jscript.engine.values;
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.Context;
-import me.topchetoeu.jscript.engine.FunctionContext;
+import me.topchetoeu.jscript.engine.Environment;
 import me.topchetoeu.jscript.engine.frame.CodeFrame;
 import me.topchetoeu.jscript.engine.scope.ValueVariable;
 
@@ -12,7 +12,7 @@ public class CodeFunction extends FunctionValue {
     public final int length;
     public final Instruction[] body;
     public final ValueVariable[] captures;
-    public FunctionContext environment;
+    public Environment environment;
 
     public Location loc() {
         for (var instr : body) {
@@ -29,10 +29,10 @@ public class CodeFunction extends FunctionValue {
 
     @Override
     public Object call(Context ctx, Object thisArg, Object ...args) throws InterruptedException {
-        return new CodeFrame(ctx, thisArg, args, this).run(new Context(environment, ctx.message));
+        return new CodeFrame(ctx, thisArg, args, this).run(ctx.setEnv(environment));
     }
 
-    public CodeFunction(FunctionContext environment, String name, int localsN, int length, ValueVariable[] captures, Instruction[] body) {
+    public CodeFunction(Environment environment, String name, int localsN, int length, ValueVariable[] captures, Instruction[] body) {
         super(name, length);
         this.captures = captures;
         this.environment = environment;

src/me/topchetoeu/jscript/engine/values/NativeWrapper.java

@@ -8,7 +8,8 @@ public class NativeWrapper extends ObjectValue {
 
     @Override
     public ObjectValue getPrototype(Context ctx) throws InterruptedException {
-        if (prototype == NATIVE_PROTO) return ctx.function.wrappersProvider.getProto(wrapped.getClass());
+        if (prototype == NATIVE_PROTO)
+            return ctx.env.wrappersProvider.getProto(wrapped.getClass());
         else return super.getPrototype(ctx);
     }
 

src/me/topchetoeu/jscript/engine/values/ObjectValue.java

@@ -55,7 +55,7 @@ public class ObjectValue {
 
     public final boolean memberWritable(Object key) {
         if (state == State.FROZEN) return false;
-        return !nonWritableSet.contains(key);
+        return !values.containsKey(key) || !nonWritableSet.contains(key);
     }
     public final boolean memberConfigurable(Object key) {
         if (state == State.SEALED || state == State.FROZEN) return false;
@@ -147,13 +147,13 @@ public class ObjectValue {
 
     public ObjectValue getPrototype(Context ctx) throws InterruptedException {
         try {
-            if (prototype == OBJ_PROTO) return ctx.function.proto("object");
-            if (prototype == ARR_PROTO) return ctx.function.proto("array");
-            if (prototype == FUNC_PROTO) return ctx.function.proto("function");
-            if (prototype == ERR_PROTO) return ctx.function.proto("error");
-            if (prototype == RANGE_ERR_PROTO) return ctx.function.proto("rangeErr");
-            if (prototype == SYNTAX_ERR_PROTO) return ctx.function.proto("syntaxErr");
-            if (prototype == TYPE_ERR_PROTO) return ctx.function.proto("typeErr");
+            if (prototype == OBJ_PROTO) return ctx.env.proto("object");
+            if (prototype == ARR_PROTO) return ctx.env.proto("array");
+            if (prototype == FUNC_PROTO) return ctx.env.proto("function");
+            if (prototype == ERR_PROTO) return ctx.env.proto("error");
+            if (prototype == RANGE_ERR_PROTO) return ctx.env.proto("rangeErr");
+            if (prototype == SYNTAX_ERR_PROTO) return ctx.env.proto("syntaxErr");
+            if (prototype == TYPE_ERR_PROTO) return ctx.env.proto("typeErr");
         }
         catch (NullPointerException e) {
             return null;
@@ -172,14 +172,14 @@ public class ObjectValue {
         else if (Values.isObject(val)) {
             var obj = Values.object(val);
 
-            if (ctx != null && ctx.function != null) {
-                if (obj == ctx.function.proto("object")) prototype = OBJ_PROTO;
-                else if (obj == ctx.function.proto("array")) prototype = ARR_PROTO;
-                else if (obj == ctx.function.proto("function")) prototype = FUNC_PROTO;
-                else if (obj == ctx.function.proto("error")) prototype = ERR_PROTO;
-                else if (obj == ctx.function.proto("syntaxErr")) prototype = SYNTAX_ERR_PROTO;
-                else if (obj == ctx.function.proto("typeErr")) prototype = TYPE_ERR_PROTO;
-                else if (obj == ctx.function.proto("rangeErr")) prototype = RANGE_ERR_PROTO;
+            if (ctx != null && ctx.env != null) {
+                if (obj == ctx.env.proto("object")) prototype = OBJ_PROTO;
+                else if (obj == ctx.env.proto("array")) prototype = ARR_PROTO;
+                else if (obj == ctx.env.proto("function")) prototype = FUNC_PROTO;
+                else if (obj == ctx.env.proto("error")) prototype = ERR_PROTO;
+                else if (obj == ctx.env.proto("syntaxErr")) prototype = SYNTAX_ERR_PROTO;
+                else if (obj == ctx.env.proto("typeErr")) prototype = TYPE_ERR_PROTO;
+                else if (obj == ctx.env.proto("rangeErr")) prototype = RANGE_ERR_PROTO;
                 else prototype = obj;
             }
             else prototype = obj;
@@ -233,7 +233,7 @@ public class ObjectValue {
     public final Object getMember(Context ctx, Object key, Object thisArg) throws InterruptedException {
         key = Values.normalize(ctx, key);
 
-        if (key.equals("__proto__")) {
+        if ("__proto__".equals(key)) {
             var res = getPrototype(ctx);
             return res == null ? Values.NULL : res;
         }

src/me/topchetoeu/jscript/engine/values/SignalValue.java

@@ -1,17 +0,0 @@
-package me.topchetoeu.jscript.engine.values;
-
-public final class SignalValue {
-    public final String data;
-
-    public SignalValue(String data) {
-        this.data = data;
-    }
-
-    public static boolean isSignal(Object signal, String value) {
-        if (!(signal instanceof SignalValue)) return false;
-        var val = ((SignalValue)signal).data;
-
-        if (value.endsWith("*")) return val.startsWith(value.substring(0, value.length() - 1));
-        else return val.equals(value);
-    }
-}

src/me/topchetoeu/jscript/engine/values/Symbol.java

@@ -10,6 +10,6 @@ public final class Symbol {
     @Override
     public String toString() {
         if (value == null) return "Symbol";
-        else return "Symbol(" + value + ")";
+        else return "@@" + value;
     }
 }

src/me/topchetoeu/jscript/engine/values/Values.java

@@ -13,7 +13,9 @@ import java.util.Map;
 import me.topchetoeu.jscript.engine.Context;
 import me.topchetoeu.jscript.engine.Operation;
 import me.topchetoeu.jscript.engine.frame.ConvertHint;
+import me.topchetoeu.jscript.exceptions.ConvertException;
 import me.topchetoeu.jscript.exceptions.EngineException;
+import me.topchetoeu.jscript.exceptions.SyntaxException;
 
 public class Values {
     public static final Object NULL = new Object();
@@ -82,7 +84,6 @@ public class Values {
             obj instanceof String ||
             obj instanceof Boolean ||
             obj instanceof Symbol ||
-            obj instanceof SignalValue ||
             obj == null ||
             obj == NULL;
     }
@@ -115,8 +116,8 @@ public class Values {
     public static double toNumber(Context ctx, Object obj) throws InterruptedException {
         var val = toPrimitive(ctx, obj, ConvertHint.VALUEOF);
 
-        if (val instanceof Number) return number(obj);
-        if (val instanceof Boolean) return ((Boolean)obj) ? 1 : 0;
+        if (val instanceof Number) return number(val);
+        if (val instanceof Boolean) return ((Boolean)val) ? 1 : 0;
         if (val instanceof String) {
             try {
                 return Double.parseDouble((String)val);
@@ -132,7 +133,7 @@ public class Values {
         if (val == NULL) return "null";
 
         if (val instanceof Number) {
-            var d = number(obj);
+            var d = number(val);
             if (d == Double.NEGATIVE_INFINITY) return "-Infinity";
             if (d == Double.POSITIVE_INFINITY) return "Infinity";
             if (Double.isNaN(d)) return "NaN";
@@ -141,7 +142,6 @@ public class Values {
         if (val instanceof Boolean) return (Boolean)val ? "true" : "false";
         if (val instanceof String) return (String)val;
         if (val instanceof Symbol) return ((Symbol)val).toString();
-        if (val instanceof SignalValue) return "[signal '" + ((SignalValue)val).data + "']";
 
         return "Unknown value";
     }
@@ -321,10 +321,10 @@ public class Values {
         if (isObject(obj)) return object(obj).getPrototype(ctx);
         if (ctx == null) return null;
 
-        if (obj instanceof String) return ctx.function.proto("string");
-        else if (obj instanceof Number) return ctx.function.proto("number");
-        else if (obj instanceof Boolean) return ctx.function.proto("bool");
-        else if (obj instanceof Symbol) return ctx.function.proto("symbol");
+        if (obj instanceof String) return ctx.env.proto("string");
+        else if (obj instanceof Number) return ctx.env.proto("number");
+        else if (obj instanceof Boolean) return ctx.env.proto("bool");
+        else if (obj instanceof Symbol) return ctx.env.proto("symbol");
 
         return null;
     }
@@ -352,12 +352,38 @@ public class Values {
 
         return res;
     }
+    public static ObjectValue getMemberDescriptor(Context ctx, Object obj, Object key) throws InterruptedException {
+        if (obj instanceof ObjectValue) return ((ObjectValue)obj).getMemberDescriptor(ctx, key);
+        else if (obj instanceof String && key instanceof Number) {
+            var i = ((Number)key).intValue();
+            var _i = ((Number)key).doubleValue();
+            if (i - _i != 0) return null;
+            if (i < 0 || i >= ((String)obj).length()) return null;
+
+            return new ObjectValue(ctx, Map.of(
+                "value", ((String)obj).charAt(i) + "",
+                "writable", false,
+                "enumerable", true,
+                "configurable", false
+            ));
+        }
+        else return null;
+    }
 
     public static Object call(Context ctx, Object func, Object thisArg, Object ...args) throws InterruptedException {
-        if (!isFunction(func))
-            throw EngineException.ofType("Tried to call a non-function value.");
+        if (!isFunction(func)) throw EngineException.ofType("Tried to call a non-function value.");
         return function(func).call(ctx, thisArg, args);
     }
+    public static Object callNew(Context ctx, Object func, Object ...args) throws InterruptedException {
+        var res = new ObjectValue();
+        var proto = Values.getMember(ctx, func, "prototype");
+        res.setPrototype(ctx, proto);
+
+        var ret = call(ctx, func, res, args);
+
+        if (ret != null && func instanceof FunctionValue && ((FunctionValue)func).special) return ret;
+        return res;
+    }
 
     public static boolean strictEquals(Context ctx, Object a, Object b) {
         a = normalize(ctx, a); b = normalize(ctx, b);
@@ -420,7 +446,7 @@ public class Values {
 
         if (val instanceof Class) {
             if (ctx == null) return null;
-            else return ctx.function.wrappersProvider.getConstr((Class<?>)val);
+            else return ctx.env.wrappersProvider.getConstr((Class<?>)val);
         }
 
         return new NativeWrapper(val);
@@ -429,17 +455,15 @@ public class Values {
     @SuppressWarnings("unchecked")
     public static <T> T convert(Context ctx, Object obj, Class<T> clazz) throws InterruptedException {
         if (clazz == Void.class) return null;
-        if (clazz == null || clazz == Object.class) return (T)obj;
-
-        var err = new IllegalArgumentException(String.format("Cannot convert '%s' to '%s'.", type(obj), clazz.getName()));
 
         if (obj instanceof NativeWrapper) {
             var res = ((NativeWrapper)obj).wrapped;
             if (clazz.isInstance(res)) return (T)res;
         }
 
+        if (clazz == null || clazz == Object.class) return (T)obj;
+
         if (obj instanceof ArrayValue) {
-            
             if (clazz.isAssignableFrom(ArrayList.class)) {
                 var raw = array(obj).toArray();
                 var res = new ArrayList<>();
@@ -480,11 +504,9 @@ public class Values {
 
         if (clazz == Character.class || clazz == char.class) {
             if (obj instanceof Number) return (T)(Character)(char)number(obj);
-            else if (obj == NULL) throw new IllegalArgumentException("Cannot convert null to character.");
-            else if (obj == null) throw new IllegalArgumentException("Cannot convert undefined to character.");
             else {
                 var res = toString(ctx, obj);
-                if (res.length() == 0) throw new IllegalArgumentException("Cannot convert empty string to character.");
+                if (res.length() == 0) throw new ConvertException("\"\"", "Character");
                 else return (T)(Character)res.charAt(0);
             }
         }
@@ -492,30 +514,32 @@ public class Values {
         if (obj == null) return null;
         if (clazz.isInstance(obj)) return (T)obj;
 
-        throw err;
+        throw new ConvertException(type(obj), clazz.getSimpleName());
     }
 
-    public static Iterable<Object> toJavaIterable(Context ctx, Object obj) throws InterruptedException {
+    public static Iterable<Object> toJavaIterable(Context ctx, Object obj) {
         return () -> {
             try {
-                var constr = getMember(ctx, ctx.function.proto("symbol"), "constructor");
-                var symbol = getMember(ctx, constr, "iterator");
+                var symbol = ctx.env.symbol("Symbol.iterator");
 
                 var iteratorFunc = getMember(ctx, obj, symbol);
                 if (!isFunction(iteratorFunc)) return Collections.emptyIterator();
-                var iterator = getMember(ctx, call(ctx, iteratorFunc, obj), "next");
-                if (!isFunction(iterator)) return Collections.emptyIterator();
-                var iterable = obj;
+                var iterator = iteratorFunc instanceof FunctionValue ?
+                    ((FunctionValue)iteratorFunc).call(ctx, obj, obj) :
+                    iteratorFunc;
+                var nextFunc = getMember(ctx, call(ctx, iteratorFunc, obj), "next");
+
+                if (!isFunction(nextFunc)) return Collections.emptyIterator();
 
                 return new Iterator<Object>() {
                     private Object value = null;
                     public boolean consumed = true;
-                    private FunctionValue next = function(iterator);
+                    private FunctionValue next = (FunctionValue)nextFunc;
 
                     private void loadNext() throws InterruptedException {
                         if (next == null) value = null;
                         else if (consumed) {
-                            var curr = object(next.call(ctx, iterable));
+                            var curr = object(next.call(ctx, iterator));
                             if (curr == null) { next = null; value = null; }
                             if (toBoolean(curr.getMember(ctx, "done"))) { next = null; value = null; }
                             else {
@@ -562,12 +586,11 @@ public class Values {
         };
     }
 
-    public static ObjectValue fromJavaIterable(Context ctx, Iterable<?> iterable) throws InterruptedException {
+    public static ObjectValue fromJavaIterator(Context ctx, Iterator<?> it) throws InterruptedException {
         var res = new ObjectValue();
-        var it = iterable.iterator();
 
         try {
-            var key = getMember(ctx, getMember(ctx, ctx.function.proto("symbol"), "constructor"), "iterator");
+            var key = getMember(ctx, getMember(ctx, ctx.env.proto("symbol"), "constructor"), "iterator");
             res.defineProperty(ctx, key, new NativeFunction("", (_ctx, thisArg, args) -> thisArg));
         }
         catch (IllegalArgumentException | NullPointerException e) { }
@@ -580,6 +603,10 @@ public class Values {
         return res;
     }
 
+    public static ObjectValue fromJavaIterable(Context ctx, Iterable<?> it) throws InterruptedException {
+        return fromJavaIterator(ctx, it.iterator());
+    }
+
     private static void printValue(Context ctx, Object val, HashSet<Object> passed, int tab) throws InterruptedException {
         if (passed.contains(val)) {
             System.out.print("[circular]");
@@ -604,7 +631,7 @@ public class Values {
                 if (i != 0) System.out.print(", ");
                 else System.out.print(" ");
                 if (obj.has(i)) printValue(ctx, obj.get(i), passed, tab);
-                else System.out.print(", ");
+                else System.out.print("<empty>");
             }
             System.out.print(" ] ");
         }
@@ -655,4 +682,25 @@ public class Values {
     public static void printValue(Context ctx, Object val) throws InterruptedException {
         printValue(ctx, val, new HashSet<>(), 0);
     }
+    public static void printError(RuntimeException err, String prefix) throws InterruptedException {
+        prefix = prefix == null ? "Uncaught" : "Uncaught " + prefix;
+        try {
+            if (err instanceof EngineException) {
+                System.out.println(prefix + " " + ((EngineException)err).toString(((EngineException)err).ctx));
+            }
+            else if (err instanceof SyntaxException) {
+                System.out.println("Syntax error:" + ((SyntaxException)err).msg);
+            }
+            else if (err.getCause() instanceof InterruptedException) return;
+            else {
+                System.out.println("Internal error ocurred:");
+                err.printStackTrace();
+            }
+        }
+        catch (EngineException ex) {
+            System.out.println("Uncaught ");
+            Values.printValue(null, ((EngineException)err).value);
+            System.out.println();
+        }
+    }
 }

src/me/topchetoeu/jscript/exceptions/ConvertException.java

@@ -0,0 +1,11 @@
+package me.topchetoeu.jscript.exceptions;
+
+public class ConvertException extends RuntimeException {
+    public final String source, target;
+
+    public ConvertException(String source, String target) {
+        super(String.format("Cannot convert '%s' to '%s'.", source, target));
+        this.source = source;
+        this.target = target;
+    }
+}

src/me/topchetoeu/jscript/exceptions/EngineException.java

@@ -12,6 +12,7 @@ import me.topchetoeu.jscript.engine.values.ObjectValue.PlaceholderProto;
 public class EngineException extends RuntimeException {
     public final Object value;
     public EngineException cause;
+    public Context ctx = null;
     public final List<String> stackTrace = new ArrayList<>();
 
     public EngineException add(String name, Location location) {
@@ -27,6 +28,10 @@ public class EngineException extends RuntimeException {
         this.cause = cause;
         return this;
     }
+    public EngineException setContext(Context ctx) {
+        this.ctx = ctx;
+        return this;
+    }
 
     public String toString(Context ctx) throws InterruptedException {
         var ss = new StringBuilder();
@@ -36,16 +41,17 @@ public class EngineException extends RuntimeException {
         catch (EngineException e) {
             ss.append("[Error while stringifying]\n");
         }
-        for (var line : stackTrace) {
-            ss.append("    ").append(line).append('\n');
-        }
-        if (cause != null) ss.append("Caused by ").append(cause.toString(ctx)).append('\n');
+        // for (var line : stackTrace) {
+        //     ss.append("    ").append(line).append('\n');
+        // }
+        // if (cause != null) ss.append("Caused by ").append(cause.toString(ctx)).append('\n');
         ss.deleteCharAt(ss.length() - 1);
         return ss.toString();
     }
 
-    private static Object err(String msg, PlaceholderProto proto) {
+    private static Object err(String name, String msg, PlaceholderProto proto) {
         var res = new ObjectValue(proto);
+        if (name != null) res.defineProperty(null, "name", name);
         res.defineProperty(null, "message", msg);
         return res;
     }
@@ -57,19 +63,22 @@ public class EngineException extends RuntimeException {
         this.cause = null;
     }
 
+    public static EngineException ofError(String name, String msg) {
+        return new EngineException(err(name, msg, PlaceholderProto.ERROR));
+    }
     public static EngineException ofError(String msg) {
-        return new EngineException(err(msg, PlaceholderProto.ERROR));
+        return new EngineException(err(null, msg, PlaceholderProto.ERROR));
     }
     public static EngineException ofSyntax(SyntaxException e) {
-        return new EngineException(err(e.msg, PlaceholderProto.SYNTAX_ERROR)).add(null, e.loc);
+        return new EngineException(err(null, e.msg, PlaceholderProto.SYNTAX_ERROR)).add(null, e.loc);
     }
     public static EngineException ofSyntax(String msg) {
-        return new EngineException(err(msg, PlaceholderProto.SYNTAX_ERROR));
+        return new EngineException(err(null, msg, PlaceholderProto.SYNTAX_ERROR));
     }
     public static EngineException ofType(String msg) {
-        return new EngineException(err(msg, PlaceholderProto.TYPE_ERROR));
+        return new EngineException(err(null, msg, PlaceholderProto.TYPE_ERROR));
     }
     public static EngineException ofRange(String msg) {
-        return new EngineException(err(msg, PlaceholderProto.RANGE_ERROR));
+        return new EngineException(err(null, msg, PlaceholderProto.RANGE_ERROR));
     }
 }