refactor: remove unused var

Major codebase cleanup

.gitattributes

@@ -0,0 +1 @@
+* -text

.github/workflows/tagged-release.yml

@@ -11,15 +11,22 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'adopt'
+          java-version: '11'
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
       - name: Clone repository
         uses: GuillaumeFalourd/clone-github-repo-action@main
         with:
-          branch: 'master' # fuck this political bullshitshit, took me an hour to fix this
+          branch: 'master'
           owner: 'TopchetoEU'
           repository: 'java-jscript'
-      - name: "Build"
+      - name: Build
         run: |
-          cd java-jscript; node ./build.js release ${{ github.ref }}
+          cd java-jscript; gradle build
 
       - uses: "marvinpinto/action-automatic-releases@latest"
         with:
@@ -27,4 +34,4 @@ jobs:
           prerelease: false
           files: |
             java-jscript/LICENSE
-            java-jscript/dst/*.jar
+            java-jscript/build/libs/*.jar

.gitignore

@@ -1,11 +1,24 @@
-.vscode
+*
-.gradle
+
-.ignore
+!/src
-/out
+!/src/**/*
-/build
+
-/bin
+!/doc
-/dst
+!/doc/**/*
-/*.js
+
-!/build.js
+!/tests
-/dead-code
+!/tests/**/*
-/Metadata.java
+
+!/.github
+!/.github/**/*
+
+!/.gitignore
+!/.gitattributes
+!/LICENSE
+!/README.md
+!/settings.gradle
+!/build.gradle
+!/gradle.properties
+!/gradle
+!/gradle/wrapper
+!/gradle/wrapper/gradle-wrapper.properties

README.md

@@ -2,33 +2,28 @@
 
 **NOTE: This had nothing to do with Microsoft's dialect of EcmaScript**
 
-**WARNING: Currently, this code is mostly undocumented. Proceed with caution and a psychiatrist.**
+**WARNING: Currently, this code is undocumented. Proceed with caution and a psychiatrist.**
 
-JScript is an engine, capable of running EcmaScript 5, written entirely in Java. This engine has been developed with the goal of being easy to integrate with your preexisting codebase, **THE GOAL OF THIS ENGINE IS NOT PERFORMANCE**. My crude experiments show that this engine is 50x-100x slower than V8, which, although bad, is acceptable for most simple scripting purposes.
+JScript is an engine, capable of running EcmaScript 5, written entirely in Java. This engine has been developed with the goal of being easy to integrate with your preexisting codebase, **THE GOAL OF THIS ENGINE IS NOT PERFORMANCE**. My crude experiments show that this engine is 50x-100x slower than V8, which, although bad, is acceptable for most simple scripting purposes. Note that although the codebase has a Main class, this isn't meant to be a standalone program, but instead a library for running JavaScript code.
 
 ## Example
 
-The following will create a REPL using the engine as a backend. Not that this won't properly log errors. I recommend checking out the implementation in `Main.main`:
+The following is going to execute a simple javascript statement:
 
 ```java
-var engine = new PolyfillEngine(new File("."));
+var engine = new Engine();
-var in = new BufferedReader(new InputStreamReader(System.in));
+// Initialize a standard environment, with implementations of most basic standard libraries (Object, Array, Symbol, etc.)
-engine.start();
+var env = Internals.apply(new Environment());
 
-while (true) {
+// Queue code to load internal libraries and start engine
-    try {
+var awaitable = engine.pushMsg(false, env, new Filename("tmp", "eval"), "10 + Math.sqrt(5 / 3)", null);
-        var raw = in.readLine();
+// Run the engine on the same thread, until the event loop runs empty
+engine.run(true);
 
-        var res = engine.pushMsg(false, engine.global(), Map.of(), "<stdio>", raw, null).await();
+// Get our result
-        Values.printValue(engine.context(), res);
+System.out.println(awaitable.await());
-        System.out.println();
-    }
-    catch (EngineException e) {
-        try {
-            System.out.println("Uncaught " + e.toString(engine.context()));
-        }
-        catch (InterruptedException _e) {  return; }
-    }
-    catch (IOException | InterruptedException e) { return; }
-}
 ```
+
+## NOTE:
+
+To setup the typescript bundle in your sources, run `node build.js init-ts`. This will download the latest version of typescript, minify it, and add it to your src folder. If you are going to work with the `node build.js debug|release` command, this is not a necessary step.

build.gradle

@@ -0,0 +1,32 @@
+plugins {
+    id "application"
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+    toolchain.languageVersion = JavaLanguageVersion.of(11)
+    withSourcesJar()
+}
+
+jar {
+    manifest.attributes["Main-class"] = project.main_class
+}
+
+sourceSets {
+    main.java.srcDirs = [ "src/java" ]
+    main.resources.srcDirs = [ "src/assets" ]
+}
+
+processResources {
+    filesMatching "metadata.json", {
+        expand(
+            version: project.project_version,
+            name: project.project_name
+        )
+    }
+}
+
+base.archivesName = project.project_name
+version = project.project_version
+group = project.project_group

build.js

@@ -1,79 +0,0 @@
-const { spawn } = require('child_process');
-const fs = require('fs/promises');
-const pt = require('path');
-const { argv } = require('process');
-
-const conf = {
-    name: "java-jscript",
-    author: "TopchetoEU",
-    javahome: "",
-    version: argv[3]
-};
-
-if (conf.version.startsWith('refs/tags/')) conf.version = conf.version.substring(10);
-if (conf.version.startsWith('v')) conf.version = conf.version.substring(1);
-
-async function* find(src, dst, wildcard) {
-    const stat = await fs.stat(src);
-
-    if (stat.isDirectory()) {
-        for (const el of await fs.readdir(src)) {
-            for await (const res of find(pt.join(src, el), dst ? pt.join(dst, el) : undefined, wildcard)) yield res;
-        }
-    }
-    else if (stat.isFile() && wildcard(src)) yield dst ? { src, dst } : src;
-}
-async function copy(src, dst, wildcard) {
-    const promises = [];
-
-    for await (const el of find(src, dst, wildcard)) {
-        promises.push((async () => {
-            await fs.mkdir(pt.dirname(el.dst), { recursive: true });
-            await fs.copyFile(el.src, el.dst);
-        })());
-    }
-
-    await Promise.all(promises);
-}
-
-function run(cmd, ...args) {
-    return new Promise((res, rej) => {
-        const proc = spawn(cmd, args, { stdio: 'inherit' });
-        proc.once('exit', code => {
-            if (code === 0) res(code);
-            else rej(new Error(`Process ${cmd} exited with code ${code}.`));
-        });
-    })
-}
-
-async function compileJava() {
-    try {
-        await fs.writeFile('Metadata.java', (await fs.readFile('src/me/topchetoeu/jscript/Metadata.java')).toString()
-            .replace('${VERSION}', conf.version)
-            .replace('${NAME}', conf.name)
-            .replace('${AUTHOR}', conf.author)
-        );
-        const args = ['--release', '11', ];
-        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);
-        await run(conf.javahome + 'javac', ...args);
-    }
-    finally {
-        await fs.rm('Metadata.java');
-    }
-}
-
-(async () => {
-    try {
-        try { await fs.rm('dst', { recursive: true }); } catch {}
-        await copy('src', 'dst/classes', v => !v.endsWith('.java'));
-        await compileJava();
-        await run('jar', '-c', '-f', 'dst/jscript.jar', '-e', 'me.topchetoeu.jscript.Main', '-C', 'dst/classes', '.');
-    }
-    catch (e) {
-        if (argv[2] === 'debug') throw e;
-        else console.log(e.toString());
-    }
-})();

gradle.properties

@@ -0,0 +1,4 @@
+project_group = me.topchetoeu
+project_name = jscript
+project_version = 0.8.6-beta
+main_class = me.topchetoeu.jscript.utils.JScriptRepl

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

settings.gradle

@@ -0,0 +1,5 @@
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.7.0'
+}
+
+rootProject.name = properties.project_name

src/assets/debugger/index.html

@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>JScript Debugger</title>
+</head>
+<body>
+    <p>
+        This is the debugger of JScript. It implement the <a href="https://chromedevtools.github.io/devtools-protocol/1-2/">V8 Debugging protocol</a>,
+        so you can use the devtools in chrome. <br>
+        The debugger is still in early development, so please report any issues to
+        <a href="https://github.com/TopchetoEU/java-jscript/issues">the github repo</a>.
+    </p>
+
+    <p>
+        Here are the available entrypoints:
+        <ul>
+            <li><a href="json/version">/json/version</a> - version and other stuff about the JScript engine</li>
+            <li><a href="json/list">/json/list</a> - a list of all entrypoints</li>
+            <li><a href="json/protocol">/json/protocol</a> - documentation of the implemented V8 protocol</li>
+            <li>/(any target) - websocket entrypoints for debugging</li>
+        </ul>
+    </p>
+
+    <p>
+        Running ${NAME} v${VERSION} by ${AUTHOR}
+    </p>
+</body>
+</html>

src/assets/metadata.json

@@ -0,0 +1,5 @@
+{
+    "version": "${version}",
+    "name": "${name}",
+    "author": "TopchetoEU"
+}

src/java/me/topchetoeu/jscript/common/Buffer.java

@@ -0,0 +1,53 @@
+package me.topchetoeu.jscript.common;
+
+public class Buffer {
+    private byte[] data;
+    private int length;
+
+    public void write(int i, byte[] val) {
+        if (i + val.length > data.length) {
+            var newCap = i + val.length + 1;
+            if (newCap < data.length * 2) newCap = data.length * 2;
+
+            var tmp = new byte[newCap];
+            System.arraycopy(this.data, 0, tmp, 0, length);
+            this.data = tmp;
+        }
+
+        System.arraycopy(val, 0, data, i, val.length);
+        if (i + val.length > length) length = i + val.length;
+    }
+    public int read(int i, byte[] buff) {
+        int n = buff.length;
+        if (i + n > length) n = length - i;
+        System.arraycopy(data, i, buff, 0, n);
+        return n;
+    }
+
+    public void append(byte b) {
+        write(length, new byte[] { b });
+    }
+
+    public byte[] data() {
+        var res = new byte[length];
+        System.arraycopy(this.data, 0, res, 0, length);
+        return res;
+    }
+    public int length() {
+        return length;
+    }
+
+    public Buffer(byte[] data) {
+        this.data = new byte[data.length];
+        this.length = data.length;
+        System.arraycopy(data, 0, this.data, 0, data.length);
+    }
+    public Buffer(int capacity) {
+        this.data = new byte[capacity];
+        this.length = 0;
+    }
+    public Buffer() {
+        this.data = new byte[128];
+        this.length = 0;
+    }
+}

src/java/me/topchetoeu/jscript/common/Filename.java

@@ -0,0 +1,57 @@
+package me.topchetoeu.jscript.common;
+
+import java.io.File;
+import java.nio.file.Path;
+
+public class Filename {
+    public final String protocol;
+    public final String path;
+
+    @Override public String toString() {
+        return protocol + "://" + path;
+    }
+    @Override public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + protocol.hashCode();
+        result = prime * result + path.hashCode();
+        return result;
+    }
+    @Override public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null) return false;
+        if (getClass() != obj.getClass()) return false;
+
+        var other = (Filename) obj;
+
+        if (protocol == null) {
+            if (other.protocol != null) return false;
+        }
+        else if (!protocol.equals(other.protocol)) return false;
+
+        if (path == null) {
+            if (other.path != null) return false;
+        }
+        else if (!path.equals(other.path)) return false;
+        return true;
+    }
+
+    public Filename(String protocol, String path) {
+        path = path.trim();
+        protocol = protocol.trim();
+        this.protocol = protocol;
+        this.path = path;
+    }
+
+    public static Filename parse(String val) {
+        var i = val.indexOf("://");
+        if (i >= 0) return new Filename(val.substring(0, i).trim(), val.substring(i + 3).trim());
+        else return new Filename("file", val.trim());
+    }
+    public static Path normalize(String path) {
+        return Path.of(Path.of("/" + path.trim().replace("\\", "/")).normalize().toString().substring(1));
+    }
+    public static Filename fromFile(File file) {
+        return new Filename("file", file.getAbsolutePath());
+    }
+}

src/java/me/topchetoeu/jscript/common/FunctionBody.java

@@ -0,0 +1,14 @@
+package me.topchetoeu.jscript.common;
+
+public class FunctionBody {
+    public final FunctionBody[] children;
+    public final Instruction[] instructions;
+    public final int localsN, argsN;
+
+    public FunctionBody(int localsN, int argsN, Instruction[] instructions, FunctionBody[] children) {
+        this.children = children;
+        this.argsN = argsN;
+        this.localsN = localsN;
+        this.instructions = instructions;
+    }
+}

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

@@ -0,0 +1,369 @@
+package me.topchetoeu.jscript.common;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+
+public class Instruction {
+    public static enum Type {
+        NOP(0),
+        RETURN(1),
+        THROW(2),
+        THROW_SYNTAX(3),
+        DELETE(4),
+        TRY_START(5),
+        TRY_END(6),
+
+        CALL(7),
+        CALL_NEW(8),
+        JMP_IF(9),
+        JMP_IFN(10),
+        JMP(11),
+
+        PUSH_UNDEFINED(12),
+        PUSH_NULL(13),
+        PUSH_BOOL(14),
+        PUSH_NUMBER(15),
+        PUSH_STRING(16),
+
+        LOAD_VAR(17),
+        LOAD_MEMBER(18),
+        LOAD_GLOB(20),
+
+        LOAD_FUNC(21),
+        LOAD_ARR(22),
+        LOAD_OBJ(23),
+        STORE_SELF_FUNC(24),
+        LOAD_REGEX(25),
+
+        DUP(26),
+
+        STORE_VAR(27),
+        STORE_MEMBER(28),
+        DISCARD(29),
+
+        MAKE_VAR(30),
+        DEF_PROP(31),
+        KEYS(32),
+
+        TYPEOF(33),
+        OPERATION(34);
+
+        private static final HashMap<Integer, Type> types = new HashMap<>();
+        public final int numeric;
+
+        static {
+            for (var val : Type.values()) types.put(val.numeric, val);
+        }
+
+        private Type(int numeric) {
+            this.numeric = numeric;
+        }
+
+        public static Type fromNumeric(int i) {
+            return types.get(i);
+        }
+    }
+    public static enum BreakpointType {
+        NONE,
+        STEP_OVER,
+        STEP_IN;
+
+        public boolean shouldStepIn() {
+            return this != NONE;
+        }
+        public boolean shouldStepOver() {
+            return this == STEP_OVER;
+        }
+    }
+
+    public final Type type;
+    public final Object[] params;
+
+    @SuppressWarnings("unchecked")
+    public <T> T get(int i) {
+        if (i >= params.length || i < 0) return null;
+        return (T)params[i];
+    }
+    @SuppressWarnings("unchecked")
+    public <T> T get(int i, T defaultVal) {
+        if (i >= params.length || i < 0) return defaultVal;
+        return (T)params[i];
+    }
+    public boolean match(Object ...args) {
+        if (args.length != params.length) return false;
+        for (int i = 0; i < args.length; i++) {
+            var a = params[i];
+            var b = args[i];
+            if (a == null || b == null) {
+                if (!(a == null && b == null)) return false;
+            }
+            if (!a.equals(b)) return false;
+        }
+        return true;
+    }
+    public boolean is(int i, Object arg) {
+        if (params.length <= i) return false;
+        return params[i].equals(arg);
+    }
+
+    public void write(DataOutputStream writer) throws IOException {
+        var rawType = type.numeric;
+
+        switch (type) {
+            case KEYS:
+            case PUSH_BOOL:
+            case STORE_MEMBER: rawType |= (boolean)get(0) ? 128 : 0; break;
+            case STORE_VAR: rawType |= (boolean)get(1) ? 128 : 0; break;
+            case TYPEOF: rawType |= params.length > 0 ? 128 : 0; break;
+            default:
+        }
+
+        writer.writeByte(rawType);
+
+        switch (type) {
+            case CALL: writer.writeInt(get(0)); break;
+            case CALL_NEW: writer.writeInt(get(0)); break;
+            case DUP: writer.writeInt(get(0)); break;
+            case JMP: writer.writeInt(get(0)); break;
+            case JMP_IF: writer.writeInt(get(0)); break;
+            case JMP_IFN: writer.writeInt(get(0)); break;
+            case LOAD_ARR: writer.writeInt(get(0)); break;
+            case LOAD_FUNC: {
+                writer.writeInt(params.length - 1);
+
+                for (var i = 0; i < params.length; i++) {
+                    writer.writeInt(get(i + 1));
+                }
+
+                writer.writeInt(get(0));
+                break;
+            }
+            case LOAD_REGEX: writer.writeUTF(get(0)); break;
+            case LOAD_VAR: writer.writeInt(get(0)); break;
+            case MAKE_VAR: writer.writeUTF(get(0)); break;
+            case OPERATION: writer.writeByte(((Operation)get(0)).numeric); break;
+            case PUSH_NUMBER: writer.writeDouble(get(0)); break;
+            case PUSH_STRING: writer.writeUTF(get(0)); break;
+            case STORE_SELF_FUNC: writer.writeInt(get(0)); break;
+            case STORE_VAR: writer.writeInt(get(0)); break;
+            case THROW_SYNTAX: writer.writeUTF(get(0));
+            case TRY_START:
+                writer.writeInt(get(0));
+                writer.writeInt(get(1));
+                writer.writeInt(get(2));
+                break;
+            case TYPEOF:
+                if (params.length > 0) writer.writeUTF(get(0));
+                break;
+            default:
+        }
+    }
+
+    private Instruction(Type type, Object ...params) {
+        this.type = type;
+        this.params = params;
+    }
+
+    public static Instruction read(DataInputStream stream) throws IOException {
+        var rawType = stream.readUnsignedByte();
+        var type = Type.fromNumeric(rawType & 127);
+        var flag = (rawType & 128) != 0;
+
+        switch (type) {
+            case CALL: return call(stream.readInt());
+            case CALL_NEW: return callNew(stream.readInt());
+            case DEF_PROP: return defProp();
+            case DELETE: return delete();
+            case DISCARD: return discard();
+            case DUP: return dup(stream.readInt());
+            case JMP: return jmp(stream.readInt());
+            case JMP_IF: return jmpIf(stream.readInt());
+            case JMP_IFN: return jmpIfNot(stream.readInt());
+            case KEYS: return keys(flag);
+            case LOAD_ARR: return loadArr(stream.readInt());
+            case LOAD_FUNC: {
+                var captures = new int[stream.readInt()];
+
+                for (var i = 0; i < captures.length; i++) {
+                    captures[i] = stream.readInt();
+                }
+
+                return loadFunc(stream.readInt(), captures);
+            }
+            case LOAD_GLOB: return loadGlob();
+            case LOAD_MEMBER: return loadMember();
+            case LOAD_OBJ: return loadObj();
+            case LOAD_REGEX: return loadRegex(stream.readUTF(), null);
+            case LOAD_VAR: return loadVar(stream.readInt());
+            case MAKE_VAR: return makeVar(stream.readUTF());
+            case OPERATION: return operation(Operation.fromNumeric(stream.readUnsignedByte()));
+            case PUSH_NULL: return pushNull();
+            case PUSH_UNDEFINED: return pushUndefined();
+            case PUSH_BOOL: return pushValue(flag);
+            case PUSH_NUMBER: return pushValue(stream.readDouble());
+            case PUSH_STRING: return pushValue(stream.readUTF());
+            case RETURN: return ret();
+            case STORE_MEMBER: return storeMember(flag);
+            case STORE_SELF_FUNC: return storeSelfFunc(stream.readInt());
+            case STORE_VAR: return storeVar(stream.readInt(), flag);
+            case THROW: return throwInstr();
+            case THROW_SYNTAX: return throwSyntax(stream.readUTF());
+            case TRY_END: return tryEnd();
+            case TRY_START: return tryStart(stream.readInt(), stream.readInt(), stream.readInt());
+            case TYPEOF: return flag ? typeof(stream.readUTF()) : typeof();
+            case NOP:
+                if (flag) return null;
+                else return nop();
+            default: return null;
+        }
+    }
+
+    public static Instruction tryStart(int catchStart, int finallyStart, int end) {
+        return new Instruction(Type.TRY_START, catchStart, finallyStart, end);
+    }
+    public static Instruction tryEnd() {
+        return new Instruction(Type.TRY_END);
+    }
+    public static Instruction throwInstr() {
+        return new Instruction(Type.THROW);
+    }
+    public static Instruction throwSyntax(SyntaxException err) {
+        return new Instruction(Type.THROW_SYNTAX, err.getMessage());
+    }
+    public static Instruction throwSyntax(String err) {
+        return new Instruction(Type.THROW_SYNTAX, err);
+    }
+    public static Instruction delete() {
+        return new Instruction(Type.DELETE);
+    }
+    public static Instruction ret() {
+        return new Instruction(Type.RETURN);
+    }
+    public static Instruction debug() {
+        return new Instruction(Type.NOP, "debug");
+    }
+
+    public static Instruction nop(Object ...params) {
+        return new Instruction(Type.NOP, params);
+    }
+
+    public static Instruction call(int argn) {
+        return new Instruction(Type.CALL, argn);
+    }
+    public static Instruction callNew(int argn) {
+        return new Instruction(Type.CALL_NEW, argn);
+    }
+    public static Instruction jmp(int offset) {
+        return new Instruction(Type.JMP, offset);
+    }
+    public static Instruction jmpIf(int offset) {
+        return new Instruction(Type.JMP_IF, offset);
+    }
+    public static Instruction jmpIfNot(int offset) {
+        return new Instruction(Type.JMP_IFN, offset);
+    }
+
+    public static Instruction pushUndefined() {
+        return new Instruction(Type.PUSH_UNDEFINED);
+    }
+    public static Instruction pushNull() {
+        return new Instruction(Type.PUSH_NULL);
+    }
+    public static Instruction pushValue(boolean val) {
+        return new Instruction(Type.PUSH_BOOL, val);
+    }
+    public static Instruction pushValue(double val) {
+        return new Instruction(Type.PUSH_NUMBER, val);
+    }
+    public static Instruction pushValue(String val) {
+        return new Instruction(Type.PUSH_STRING, val);
+    }
+
+    public static Instruction makeVar(String name) {
+        return new Instruction(Type.MAKE_VAR, name);
+    }
+    public static Instruction loadVar(Object i) {
+        return new Instruction(Type.LOAD_VAR, i);
+    }
+    public static Instruction loadGlob() {
+        return new Instruction(Type.LOAD_GLOB);
+    }
+    public static Instruction loadMember() {
+        return new Instruction(Type.LOAD_MEMBER);
+    }
+
+    public static Instruction loadRegex(String pattern, String flags) {
+        return new Instruction(Type.LOAD_REGEX, pattern, flags);
+    }
+    public static Instruction loadFunc(int id, int[] captures) {
+        var args = new Object[1 + captures.length];
+        args[0] = id;
+        for (var i = 0; i < captures.length; i++) args[i + 1] = captures[i];
+        return new Instruction(Type.LOAD_FUNC, args);
+    }
+    public static Instruction loadObj() {
+        return new Instruction(Type.LOAD_OBJ);
+    }
+    public static Instruction loadArr(int count) {
+        return new Instruction(Type.LOAD_ARR, count);
+    }
+    public static Instruction dup() {
+        return new Instruction(Type.DUP, 1);
+    }
+    public static Instruction dup(int count) {
+        return new Instruction(Type.DUP, count);
+    }
+
+    public static Instruction storeSelfFunc(int i) {
+        return new Instruction(Type.STORE_SELF_FUNC, i);
+    }
+    public static Instruction storeVar(Object i) {
+        return new Instruction(Type.STORE_VAR, i, false);
+    }
+    public static Instruction storeVar(Object i, boolean keep) {
+        return new Instruction(Type.STORE_VAR, i, keep);
+    }
+    public static Instruction storeMember() {
+        return new Instruction(Type.STORE_MEMBER, false);
+    }
+    public static Instruction storeMember(boolean keep) {
+        return new Instruction(Type.STORE_MEMBER, keep);
+    }
+    public static Instruction discard() {
+        return new Instruction(Type.DISCARD);
+    }
+
+    public static Instruction typeof() {
+        return new Instruction(Type.TYPEOF);
+    }
+    public static Instruction typeof(String varName) {
+        return new Instruction(Type.TYPEOF, varName);
+    }
+
+    public static Instruction keys(boolean forInFormat) {
+        return new Instruction(Type.KEYS, forInFormat);
+    }
+
+    public static Instruction defProp() {
+        return new Instruction(Type.DEF_PROP);
+    }
+
+    public static Instruction operation(Operation op) {
+        return new Instruction(Type.OPERATION, op);
+    }
+
+    @Override
+    public String toString() {
+        var res = type.toString();
+
+        for (int i = 0; i < params.length; i++) {
+            res += " " + params[i];
+        }
+
+        return res;
+    }
+}

src/java/me/topchetoeu/jscript/common/Location.java

@@ -0,0 +1,101 @@
+package me.topchetoeu.jscript.common;
+
+import java.util.ArrayList;
+
+public class Location implements Comparable<Location> {
+    public static final Location INTERNAL = new Location(-1, -1, new Filename("jscript", "native"));
+    private int line;
+    private int start;
+    private Filename filename;
+
+    public int line() { return line; }
+    public int start() { return start; }
+    public Filename filename() { return filename; }
+
+    @Override
+    public String toString() {
+        var res = new ArrayList<String>();
+
+        if (filename != null) res.add(filename.toString());
+        if (line >= 0) res.add(line + "");
+        if (start >= 0) res.add(start + "");
+
+        return String.join(":", res);
+    }
+
+    public Location add(int n, boolean clone) {
+        if (clone) return new Location(line, start + n, filename);
+        this.start += n;
+        return this;
+    }
+    public Location add(int n) {
+        return add(n, false);
+    }
+    public Location nextLine() {
+        line++;
+        start = 0;
+        return this;
+    }
+    public Location clone() {
+        return new Location(line, start, filename);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + line;
+        result = prime * result + start;
+        result = prime * result + ((filename == null) ? 0 : filename.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null) return false;
+        if (getClass() != obj.getClass()) return false;
+        Location other = (Location) obj;
+        if (line != other.line) return false;
+        if (start != other.start) return false;
+        if (filename == null && other.filename != null) return false;
+        else if (!filename.equals(other.filename)) return false;
+        return true;
+    }
+
+    @Override
+    public int compareTo(Location other) {
+        int a = filename.toString().compareTo(other.filename.toString());
+        int b = Integer.compare(line, other.line);
+        int c = Integer.compare(start, other.start);
+
+        if (a != 0) return a;
+        if (b != 0) return b;
+        return c;
+    }
+
+    public Location(int line, int start, Filename filename) {
+        this.line = line;
+        this.start = start;
+        this.filename = filename;
+    }
+
+    public static Location parse(String raw) {
+        int i0 = -1, i1 = -1;
+        for (var i = raw.length() - 1; i >= 0; i--) {
+            if (raw.charAt(i) == ':') {
+                if (i1 == -1) i1 = i;
+                else if (i0 == -1) {
+                    i0 = i;
+                    break;
+                }
+            }
+        }
+
+        return new Location(
+            Integer.parseInt(raw.substring(i0 + 1, i1)),
+            Integer.parseInt(raw.substring(i1 + 1)),
+            Filename.parse(raw.substring(0, i0))
+        );
+    }
+}

src/java/me/topchetoeu/jscript/common/Metadata.java

@@ -0,0 +1,29 @@
+package me.topchetoeu.jscript.common;
+
+import me.topchetoeu.jscript.common.json.JSON;
+
+public class Metadata {
+    private static final String VERSION;
+    private static final String AUTHOR;
+    private static final String NAME;
+
+    static {
+        var data = JSON.parse(null, Reading.resourceToString("metadata.json")).map();
+        VERSION = data.string("version");
+        AUTHOR = data.string("author");
+        NAME = data.string("name");
+    }
+
+    public static String version() {
+        if (VERSION.equals("$" + "{VERSION}")) return "1337-devel";
+        else return VERSION;
+    }
+    public static String author() {
+        if (AUTHOR.equals("$" + "{AUTHOR}")) return "anonymous";
+        else return AUTHOR;
+    }
+    public static String name() {
+        if (NAME.equals("$" + "{NAME}")) return "some-product";
+        else return NAME;
+    }
+}

src/java/me/topchetoeu/jscript/common/Operation.java

@@ -0,0 +1,54 @@
+package me.topchetoeu.jscript.common;
+
+import java.util.HashMap;
+
+public enum Operation {
+    INSTANCEOF(1, 2),
+    IN(2, 2),
+
+    MULTIPLY(3, 2),
+    DIVIDE(4, 2),
+    MODULO(5, 2),
+    ADD(6, 2),
+    SUBTRACT(7, 2),
+
+    USHIFT_RIGHT(8, 2),
+    SHIFT_RIGHT(9, 2),
+    SHIFT_LEFT(10, 2),
+
+    GREATER(11, 2),
+    LESS(12, 2),
+    GREATER_EQUALS(13, 2),
+    LESS_EQUALS(14, 2),
+    LOOSE_EQUALS(15, 2),
+    LOOSE_NOT_EQUALS(16, 2),
+    EQUALS(17, 2),
+    NOT_EQUALS(18, 2),
+
+    AND(19, 2),
+    OR(20, 2),
+    XOR(21, 2),
+
+    NEG(23, 1),
+    POS(24, 1),
+    NOT(25, 1),
+    INVERSE(26, 1);
+
+    private static final HashMap<Integer, Operation> operations = new HashMap<>();
+
+    static {
+        for (var val : Operation.values()) operations.put(val.numeric, val);
+    }
+
+    public final int numeric;
+    public final int operands;
+
+    private Operation(int numeric, int n) {
+        this.numeric = numeric;
+        this.operands = n;
+    }
+
+    public static Operation fromNumeric(int i) {
+        return operations.get(i);
+    }
+}

src/java/me/topchetoeu/jscript/common/Reading.java

@@ -0,0 +1,28 @@
+package me.topchetoeu.jscript.common;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.UncheckedIOException;
+
+public class Reading {
+    private static final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
+
+    public static synchronized String readline() throws IOException {
+        return reader.readLine();
+    }
+
+    public static String streamToString(InputStream in) {
+        try {
+            return new String(in.readAllBytes());
+        }
+        catch (IOException e) { throw new UncheckedIOException(e); }
+    }
+    public static InputStream resourceToStream(String name) {
+        return Reading.class.getResourceAsStream("/" + name);
+    }
+    public static String resourceToString(String name) {
+        return streamToString(resourceToStream(name));
+    }
+}

src/java/me/topchetoeu/jscript/common/RefTracker.java

@@ -0,0 +1,23 @@
+package me.topchetoeu.jscript.common;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
+
+public class RefTracker {
+    public static void onDestroy(Object obj, Runnable runnable) {
+        var queue = new ReferenceQueue<>();
+        var ref = new WeakReference<>(obj, queue);
+        obj = null;
+
+        var th = new Thread(() -> {
+            try {
+                queue.remove();
+                ref.get();
+                runnable.run();
+            }
+            catch (InterruptedException e) { return; }
+        });
+        th.setDaemon(true);
+        th.start();
+    }
+}

src/java/me/topchetoeu/jscript/common/ResultRunnable.java

@@ -0,0 +1,5 @@
+package me.topchetoeu.jscript.common;
+
+public interface ResultRunnable<T> {
+    T run();
+}

src/java/me/topchetoeu/jscript/common/ScopeRecord.java

@@ -1,8 +1,9 @@
-package me.topchetoeu.jscript.engine.scope;
+package me.topchetoeu.jscript.common;
+
+import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
 
 public interface ScopeRecord {
     public Object getKey(String name);
     public Object define(String name);
-    public ScopeRecord parent();
     public LocalScopeRecord child();
 }

src/java/me/topchetoeu/jscript/common/events/DataNotifier.java

@@ -1,6 +1,6 @@
-package me.topchetoeu.jscript.events;
+package me.topchetoeu.jscript.common.events;
 
-public class DataNotifier<T> implements Awaitable<T> {
+public class DataNotifier<T> {
     private Notifier notifier = new Notifier();
     private boolean isErr;
     private T val;
@@ -11,15 +11,12 @@ public class DataNotifier<T> implements Awaitable<T> {
         isErr = true;
         notifier.next();
     }
-    public void error(Throwable t) {
-        error(new RuntimeException(t));
-    }
     public void next(T val) {
         this.val = val;
         isErr = false;
         notifier.next();
     }
-    public T await() throws InterruptedException {
+    public T await() {
         notifier.await();
 
         try {

src/java/me/topchetoeu/jscript/common/events/Notifier.java

@@ -0,0 +1,19 @@
+package me.topchetoeu.jscript.common.events;
+
+import me.topchetoeu.jscript.core.exceptions.InterruptException;
+
+public class Notifier {
+    private boolean ok = false;
+
+    public synchronized void next() {
+        ok = true;
+        notifyAll();
+    }
+    public synchronized void await() {
+        try {
+            while (!ok) wait();
+            ok = false;
+        }
+        catch (InterruptedException e) { throw new InterruptException(e); }
+    }
+}

src/java/me/topchetoeu/jscript/common/json/JSON.java

@@ -1,29 +1,96 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
+import java.util.HashSet;
 import java.util.List;
 import java.util.stream.Collectors;
 
-import me.topchetoeu.jscript.exceptions.SyntaxException;
+import me.topchetoeu.jscript.common.Filename;
-import me.topchetoeu.jscript.parsing.Operator;
+import me.topchetoeu.jscript.compilation.parsing.Operator;
-import me.topchetoeu.jscript.parsing.ParseRes;
+import me.topchetoeu.jscript.compilation.parsing.ParseRes;
-import me.topchetoeu.jscript.parsing.Parsing;
+import me.topchetoeu.jscript.compilation.parsing.Parsing;
-import me.topchetoeu.jscript.parsing.Token;
+import me.topchetoeu.jscript.compilation.parsing.Token;
+import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.core.exceptions.SyntaxException;
 
 public class JSON {
+    public static Object toJs(JSONElement val) {
+        if (val.isBoolean()) return val.bool();
+        if (val.isString()) return val.string();
+        if (val.isNumber()) return val.number();
+        if (val.isList()) return ArrayValue.of(null, val.list().stream().map(JSON::toJs).collect(Collectors.toList()));
+        if (val.isMap()) {
+            var res = new ObjectValue();
+            for (var el : val.map().entrySet()) {
+                res.defineProperty(null, el.getKey(), toJs(el.getValue()));
+            }
+            return res;
+        }
+        if (val.isNull()) return Values.NULL;
+        return null;
+    }
+    private static JSONElement fromJs(Context ctx, Object val, HashSet<Object> prev) {
+        if (val instanceof Boolean) return JSONElement.bool((boolean)val);
+        if (val instanceof Number) return JSONElement.number(((Number)val).doubleValue());
+        if (val instanceof String) return JSONElement.string((String)val);
+        if (val == Values.NULL) return JSONElement.NULL;
+        if (val instanceof ArrayValue) {
+            if (prev.contains(val)) throw new EngineException("Circular dependency in JSON.");
+            prev.add(val);
+
+            var res = new JSONList();
+
+            for (var el : ((ArrayValue)val).toArray()) {
+                var jsonEl = fromJs(ctx, el, prev);
+                if (jsonEl == null) jsonEl = JSONElement.NULL;
+                res.add(jsonEl);
+            }
+
+            prev.remove(val);
+            return JSONElement.of(res);
+        }
+        if (val instanceof ObjectValue) {
+            if (prev.contains(val)) throw new EngineException("Circular dependency in JSON.");
+            prev.add(val);
+
+            var res = new JSONMap();
+
+            for (var el : Values.getMembers(ctx, val, false, false)) {
+                var jsonEl = fromJs(ctx, Values.getMember(ctx, val, el), prev);
+                if (jsonEl == null) continue;
+                if (el instanceof String || el instanceof Number) res.put(el.toString(), jsonEl);
+            }
+
+            prev.remove(val);
+            return JSONElement.of(res);
+        }
+        if (val == null) return null;
+        return null;
+    }
+    public static JSONElement fromJs(Context ctx, Object val) {
+        return fromJs(ctx, val, new HashSet<>());
+    }
+
     public static ParseRes<String> parseIdentifier(List<Token> tokens, int i) {
         return Parsing.parseIdentifier(tokens, i);
     }
-    public static ParseRes<String> parseString(String filename, List<Token> tokens, int i) {
+    public static ParseRes<String> parseString(Filename filename, List<Token> tokens, int i) {
         var res = Parsing.parseString(filename, tokens, i);
         if (res.isSuccess()) return ParseRes.res((String)res.result.value, res.n);
         else return res.transform();
     }
-    public static ParseRes<Double> parseNumber(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Double> parseNumber(Filename filename, List<Token> tokens, int i) {
+        var minus = Parsing.isOperator(tokens, i, Operator.SUBTRACT);
+        if (minus) i++;
+
         var res = Parsing.parseNumber(filename, tokens, i);
-        if (res.isSuccess()) return ParseRes.res((Double)res.result.value, res.n);
+        if (res.isSuccess()) return ParseRes.res((minus ? -1 : 1) * (Double)res.result.value, res.n + (minus ? 1 : 0));
         else return res.transform();
     }
-    public static ParseRes<Boolean> parseBool(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Boolean> parseBool(Filename filename, List<Token> tokens, int i) {
         var id = parseIdentifier(tokens, i);
 
         if (!id.isSuccess()) return ParseRes.failed();
@@ -32,7 +99,7 @@ public class JSON {
         else return ParseRes.failed();
     }
 
-    public static ParseRes<?> parseValue(String filename, List<Token> tokens, int i) {
+    public static ParseRes<?> parseValue(Filename filename, List<Token> tokens, int i) {
         return ParseRes.any(
             parseString(filename, tokens, i),
             parseNumber(filename, tokens, i),
@@ -42,7 +109,7 @@ public class JSON {
         );
     }
 
-    public static ParseRes<JSONMap> parseMap(String filename, List<Token> tokens, int i) {
+    public static ParseRes<JSONMap> parseMap(Filename filename, List<Token> tokens, int i) {
         int n = 0;
         if (!Parsing.isOperator(tokens, i + n++, Operator.BRACE_OPEN)) return ParseRes.failed();
 
@@ -82,7 +149,7 @@ public class JSON {
 
         return ParseRes.res(values, n);
     }
-    public static ParseRes<JSONList> parseList(String filename, List<Token> tokens, int i) {
+    public static ParseRes<JSONList> parseList(Filename filename, List<Token> tokens, int i) {
         int n = 0;
         if (!Parsing.isOperator(tokens, i + n++, Operator.BRACKET_OPEN)) return ParseRes.failed();
 
@@ -109,7 +176,8 @@ public class JSON {
 
         return ParseRes.res(values, n);
     }
-    public static JSONElement parse(String filename, String raw) {
+    public static JSONElement parse(Filename filename, String raw) {
+        if (filename == null) filename = new Filename("jscript", "json");
         var res = parseValue(filename, Parsing.tokenize(filename, raw), 0);
         if (res.isFailed()) throw new SyntaxException(null, "Invalid JSON given.");
         else if (res.isError()) throw new SyntaxException(null, res.error);
@@ -120,7 +188,28 @@ public class JSON {
         if (el.isNumber()) return Double.toString(el.number());
         if (el.isBoolean()) return el.bool() ? "true" : "false";
         if (el.isNull()) return "null";
-        if (el.isString()) return "\"" + el.string().replace("\\", "\\\\").replace("\"", "\\\"") + "\"";
+        if (el.isString()) {
+            var res = new StringBuilder("\"");
+            var alphabet = "0123456789ABCDEF".toCharArray();
+
+            for (var c : el.string().toCharArray()) {
+                if (c < 32 || c >= 127) {
+                    res
+                        .append("\\u")
+                        .append(alphabet[(c >> 12) & 0xF])
+                        .append(alphabet[(c >> 8) & 0xF])
+                        .append(alphabet[(c >> 4) & 0xF])
+                        .append(alphabet[(c >> 0) & 0xF]);
+                }
+                else if (c == '\\')
+                    res.append("\\\\");
+                else if (c == '"')
+                    res.append("\\\"");
+                else res.append(c);
+            }
+
+            return res.append('"').toString();
+        }
         if (el.isList()) {
             var res = new StringBuilder().append("[");
             for (int i = 0; i < el.list().size(); i++) {

src/java/me/topchetoeu/jscript/common/json/JSONElement.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
 public class JSONElement {
     public static enum Type {
@@ -65,10 +65,22 @@ public class JSONElement {
         return (double)value;
     }
     public boolean bool() {
-        if (!isNumber()) throw new IllegalStateException("Element is not a boolean.");
+        if (!isBoolean()) throw new IllegalStateException("Element is not a boolean.");
         return (boolean)value;
     }
 
+    @Override
+    public String toString() {
+        if (isMap()) return "{...}";
+        if (isList()) return "[...]";
+        if (isString()) return (String)value;
+        if (isString()) return (String)value;
+        if (isNumber()) return (double)value + "";
+        if (isBoolean()) return (boolean)value + "";
+        if (isNull()) return "null";
+        return "";
+    }
+
     private JSONElement(Type type, Object val) {
         this.type = type;
         this.value = val;

src/java/me/topchetoeu/jscript/common/json/JSONList.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -10,6 +10,9 @@ public class JSONList extends ArrayList<JSONElement> {
     public JSONList(JSONElement ...els) {
         super(List.of(els));
     }
+    public JSONList(Collection<JSONElement> els) {
+        super(els);
+    }
 
     public JSONList addNull() { this.add(JSONElement.NULL); return this; }
     public JSONList add(String val) { this.add(JSONElement.of(val)); return this; }
@@ -17,5 +20,7 @@ public class JSONList extends ArrayList<JSONElement> {
     public JSONList add(boolean val) { this.add(JSONElement.of(val)); return this; }
     public JSONList add(Map<String, JSONElement> val) { this.add(JSONElement.of(val)); return this; }
     public JSONList add(Collection<JSONElement> val) { this.add(JSONElement.of(val)); return this; }
+    public JSONList add(JSONMap val) { this.add(JSONElement.of(val)); return this; }
+    public JSONList add(JSONList val) { this.add(JSONElement.of(val)); return this; }
 
 }

src/java/me/topchetoeu/jscript/common/json/JSONMap.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.json;
+package me.topchetoeu.jscript.common.json;
 
 import java.util.Collection;
 import java.util.HashMap;
@@ -51,7 +51,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public JSONMap map(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.map();
     }
     public JSONMap map(String path, JSONMap defaultVal) {
@@ -63,7 +63,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public JSONList list(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.list();
     }
     public JSONList list(String path, JSONList defaultVal) {
@@ -75,7 +75,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public String string(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.string();
     }
     public String string(String path, String defaultVal) {
@@ -87,7 +87,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public double number(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.number();
     }
     public double number(String path, double defaultVal) {
@@ -99,7 +99,7 @@ public class JSONMap implements Map<String, JSONElement> {
 
     public boolean bool(String path) {
         var el = get(path);
-        if (el == null) throw new IllegalStateException(String.format("'%s' doesn't exist.", path));
+        if (el == null) throw new RuntimeException(String.format("'%s' doesn't exist.", path));
         return el.bool();
     }
     public boolean bool(String path, boolean defaultVal) {

src/java/me/topchetoeu/jscript/common/mapping/ConvertType.java

@@ -0,0 +1,8 @@
+package me.topchetoeu.jscript.common.mapping;
+
+public enum ConvertType {
+    Exact,
+    Lower,
+    Upper,
+    Both,
+}

src/java/me/topchetoeu/jscript/common/mapping/FunctionMap.java

@@ -0,0 +1,190 @@
+package me.topchetoeu.jscript.common.mapping;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableSet;
+import java.util.Objects;
+import java.util.TreeMap;
+import java.util.TreeSet;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
+import me.topchetoeu.jscript.utils.mapping.SourceMap;
+
+public class FunctionMap {
+    public static class FunctionMapBuilder {
+        private final TreeMap<Integer, Location> sourceMap = new TreeMap<>();
+        private final HashMap<Location, BreakpointType> breakpoints = new HashMap<>();
+
+        public Location toLocation(int pc) {
+            return sourceMap.headMap(pc, true).firstEntry().getValue();
+        }
+
+        public FunctionMapBuilder setDebug(Location loc, BreakpointType type) {
+            if (loc == null || type == null || type == BreakpointType.NONE) return this;
+            breakpoints.put(loc, type);
+            return this;
+        }
+        public FunctionMapBuilder setLocation(int i, Location loc) {
+            if (loc == null || i < 0) return this;
+            sourceMap.put(i, loc);
+            return this;
+        }
+        public FunctionMapBuilder setLocationAndDebug(int i, Location loc, BreakpointType type) {
+            setDebug(loc, type);
+            setLocation(i, loc);
+            return this;
+        }
+
+        public Location first() {
+            if (sourceMap.size() == 0) return null;
+            return sourceMap.firstEntry().getValue();
+        }
+        public Location last() {
+            if (sourceMap.size() == 0) return null;
+            return sourceMap.lastEntry().getValue();
+        }
+
+        public FunctionMap build(String[] localNames, String[] captureNames) {
+            return new FunctionMap(sourceMap, breakpoints, localNames, captureNames);
+        }
+        public FunctionMap build(LocalScopeRecord scope) {
+            return new FunctionMap(sourceMap, breakpoints, scope.locals(), scope.captures());
+        }
+        public FunctionMap build() {
+            return new FunctionMap(sourceMap, breakpoints, new String[0], new String[0]);
+        }
+
+        private FunctionMapBuilder() { }
+    }
+
+    public static final FunctionMap EMPTY = new FunctionMap();
+
+    private final HashMap<Integer, BreakpointType> bps = new HashMap<>();
+    private final HashMap<Filename, TreeSet<Location>> bpLocs = new HashMap<>();
+
+    private final TreeMap<Integer, Location> pcToLoc = new TreeMap<>();
+
+    public final String[] localNames, captureNames;
+
+    public Location toLocation(int pc, boolean approxiamte) {
+        if (pcToLoc.size() == 0 || pc < 0 || pc > pcToLoc.lastKey()) return null;
+        var res = pcToLoc.get(pc);
+        if (!approxiamte || res != null) return res;
+        var entry = pcToLoc.headMap(pc, true).lastEntry();
+        if (entry == null) return null;
+        else return entry.getValue();
+    }
+    public Location toLocation(int pc) {
+        return toLocation(pc, false);
+    }
+
+    public BreakpointType getBreakpoint(int pc) {
+        return bps.getOrDefault(pc, BreakpointType.NONE);
+    }
+    public Location correctBreakpoint(Location loc) {
+        var set = bpLocs.get(loc.filename());
+        if (set == null) return null;
+        else return set.ceiling(loc);
+    }
+    public List<Location> correctBreakpoint(Pattern filename, int line, int column) {
+        var candidates = new HashMap<Filename, TreeSet<Location>>();
+
+        for (var name : bpLocs.keySet()) {
+            if (filename.matcher(name.toString()).matches()) {
+                candidates.put(name, bpLocs.get(name));
+            }
+        }
+
+        var res = new ArrayList<Location>(candidates.size());
+        for (var candidate : candidates.entrySet()) {
+            res.add(candidate.getValue().ceiling(new Location(line, column, candidate.getKey())));
+        }
+
+        return res;
+    }
+    public List<Location> breakpoints(Location start, Location end) {
+        if (!Objects.equals(start.filename(), end.filename())) return List.of();
+        NavigableSet<Location> set = bpLocs.get(start.filename());
+        if (set == null) return List.of();
+
+        if (start != null) set = set.tailSet(start, true);
+        if (end != null) set = set.headSet(end, true);
+
+        return set.stream().collect(Collectors.toList());
+    }
+
+    public Location start() {
+        if (pcToLoc.size() == 0) return null;
+        return pcToLoc.firstEntry().getValue();
+    }
+    public Location end() {
+        if (pcToLoc.size() == 0) return null;
+        return pcToLoc.lastEntry().getValue();
+    }
+
+    public FunctionMap apply(SourceMap map) {
+        var res = new FunctionMap(Map.of(), Map.of(), localNames, captureNames);
+
+        for (var el : pcToLoc.entrySet()) {
+            res.pcToLoc.put(el.getKey(), map.toCompiled(el.getValue()));
+        }
+
+        res.bps.putAll(bps);
+
+        for (var el : bpLocs.entrySet()) {
+            for (var loc : el.getValue()) {
+                loc = map.toCompiled(loc);
+                if (loc == null) continue;
+
+                if (!res.bpLocs.containsKey(loc.filename())) res.bpLocs.put(loc.filename(), new TreeSet<>());
+                res.bpLocs.get(loc.filename()).add(loc);
+            }
+        }
+
+        return res;
+    }
+
+    public FunctionMap clone() {
+        var res = new FunctionMap(Map.of(), Map.of(), localNames, captureNames);
+        res.pcToLoc.putAll(this.pcToLoc);
+        res.bps.putAll(bps);
+        res.bpLocs.putAll(bpLocs);
+        res.pcToLoc.putAll(pcToLoc);
+        return res;
+    }
+
+    public FunctionMap(Map<Integer, Location> map, Map<Location, BreakpointType> breakpoints, String[] localNames, String[] captureNames) {
+        var locToPc = new HashMap<Location, Integer>();
+
+        for (var el : map.entrySet()) {
+            pcToLoc.put(el.getKey(), el.getValue());
+            locToPc.putIfAbsent(el.getValue(), el.getKey());
+        }
+
+        for (var el : breakpoints.entrySet()) {
+            if (el.getValue() == null || el.getValue() == BreakpointType.NONE) continue;
+            bps.put(locToPc.get(el.getKey()), el.getValue());
+
+            if (!bpLocs.containsKey(el.getKey().filename())) bpLocs.put(el.getKey().filename(), new TreeSet<>());
+            bpLocs.get(el.getKey().filename()).add(el.getKey());
+        }
+
+        this.localNames = localNames;
+        this.captureNames = captureNames;
+    }
+    private FunctionMap() {
+        localNames = new String[0];
+        captureNames = new String[0];
+    }
+
+    public static FunctionMapBuilder builder() {
+        return new FunctionMapBuilder();
+    }
+}

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

@@ -1,10 +1,10 @@
 package me.topchetoeu.jscript.compilation;
 
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Location;
-import me.topchetoeu.jscript.engine.Operation;
+import me.topchetoeu.jscript.common.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/java/me/topchetoeu/jscript/compilation/CompileResult.java

@@ -0,0 +1,78 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.List;
+import java.util.LinkedList;
+import java.util.Vector;
+
+import me.topchetoeu.jscript.common.FunctionBody;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.mapping.FunctionMap;
+import me.topchetoeu.jscript.common.mapping.FunctionMap.FunctionMapBuilder;
+import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
+
+public class CompileResult {
+    public final Vector<Instruction> instructions = new Vector<>();
+    public final List<CompileResult> children = new LinkedList<>();
+    public final FunctionMapBuilder map = FunctionMap.builder();
+    public final LocalScopeRecord scope;
+    public int length = 0;
+
+    public int temp() {
+        instructions.add(null);
+        return instructions.size() - 1;
+    }
+
+    public CompileResult add(Instruction instr) {
+        instructions.add(instr);
+        return this;
+    }
+    public CompileResult set(int i, Instruction instr) {
+        instructions.set(i, instr);
+        return this;
+    }
+    public Instruction get(int i) {
+        return instructions.get(i);
+    }
+    public int size() { return instructions.size(); }
+
+    public void setDebug(Location loc, BreakpointType type) {
+        map.setDebug(loc, type);
+    }
+    public void setLocation(int i, Location loc) {
+        map.setLocation(i, loc);
+    }
+    public void setLocationAndDebug(int i, Location loc, BreakpointType type) {
+        map.setLocationAndDebug(i, loc, type);
+    }
+    public void setDebug(BreakpointType type) {
+        setDebug(map.last(), type);
+    }
+    public void setLocation(Location type) {
+        setLocation(instructions.size() - 1, type);
+    }
+    public void setLocationAndDebug(Location loc, BreakpointType type) {
+        setLocationAndDebug(instructions.size() - 1, loc, type);
+    }
+
+    public CompileResult addChild(CompileResult child) {
+        this.children.add(child);
+        return child;
+    }
+
+    public FunctionMap map() {
+        return map.build(scope);
+    }
+    public FunctionBody body() {
+        var builtChildren = new FunctionBody[children.size()];
+
+        for (var i = 0; i < children.size(); i++) builtChildren[i] = children.get(i).body();
+
+        return new FunctionBody(scope.localsCount(), length, instructions.toArray(Instruction[]::new), builtChildren);
+    }
+
+    public CompileResult(LocalScopeRecord scope) {
+        this.scope = scope;
+    }
+}

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

@@ -0,0 +1,64 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.List;
+import java.util.Vector;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.values.FunctionStatement;
+
+public class CompoundStatement extends Statement {
+    public final Statement[] statements;
+    public final boolean separateFuncs;
+    public Location end;
+
+    @Override public boolean pure() {
+        for (var stm : statements) {
+            if (!stm.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void declare(CompileResult target) {
+        for (var stm : statements) stm.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+        List<Statement> statements = new Vector<Statement>();
+        if (separateFuncs) for (var stm : this.statements) {
+            if (stm instanceof FunctionStatement && ((FunctionStatement)stm).statement) {
+                stm.compile(target, false);
+            }
+            else statements.add(stm);
+        }
+        else statements = List.of(this.statements);
+
+        var polluted = false;
+
+        for (var i = 0; i < statements.size(); i++) {
+            var stm = statements.get(i);
+
+            if (i != statements.size() - 1) stm.compile(target, false, BreakpointType.STEP_OVER);
+            else stm.compile(target, polluted = pollute, BreakpointType.STEP_OVER);
+        }
+
+        if (!polluted && pollute) {
+            target.add(Instruction.pushUndefined());
+        }
+    }
+
+    public CompoundStatement setEnd(Location loc) {
+        this.end = loc;
+        return this;
+    }
+
+    public CompoundStatement(Location loc, boolean separateFuncs, Statement ...statements) {
+        super(loc);
+        this.separateFuncs = separateFuncs;
+        this.statements = statements;
+    }
+}

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

@@ -0,0 +1,27 @@
+package me.topchetoeu.jscript.compilation;
+
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+
+public abstract class Statement {
+    private Location _loc;
+
+    public boolean pure() { return false; }
+    public void declare(CompileResult target) { }
+
+    public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+        int start = target.size();
+        compile(target, pollute);
+        if (target.size() != start) target.setLocationAndDebug(start, loc(), type);
+    }
+    public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, BreakpointType.NONE);
+    }
+
+    public Location loc() { return _loc; }
+    public void setLoc(Location loc) { _loc = loc; }
+
+    protected Statement(Location loc) {
+        this._loc = loc;
+    }
+}

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

@@ -0,0 +1,18 @@
+package me.topchetoeu.jscript.compilation;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+
+public class ThrowSyntaxStatement extends Statement {
+    public final String name;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.throwSyntax(name));
+    }
+
+    public ThrowSyntaxStatement(SyntaxException e) {
+        super(e.loc);
+        this.name = e.msg;
+    }
+}

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

@@ -0,0 +1,52 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.List;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.values.FunctionStatement;
+
+public class VariableDeclareStatement extends Statement {
+    public static class Pair {
+        public final String name;
+        public final Statement value;
+        public final Location location;
+
+        public Pair(String name, Statement value, Location location) {
+            this.name = name;
+            this.value = value;
+            this.location = location;
+        }
+    }
+
+    public final List<Pair> values;
+
+    @Override
+    public void declare(CompileResult target) {
+        for (var key : values) {
+            target.scope.define(key.name);
+        }
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        for (var entry : values) {
+            if (entry.name == null) continue;
+            var key = target.scope.getKey(entry.name);
+
+            if (key instanceof String) target.add(Instruction.makeVar((String)key));
+
+            if (entry.value != null) {
+                FunctionStatement.compileWithName(entry.value, target, true, entry.name, BreakpointType.STEP_OVER);
+                target.add(Instruction.storeVar(key));
+            }
+        }
+
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public VariableDeclareStatement(Location loc, List<Pair> values) {
+        super(loc);
+        this.values = values;
+    }
+}

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

@@ -0,0 +1,21 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class BreakStatement extends Statement {
+    public final String label;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.nop("break", label));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public BreakStatement(Location loc, String label) {
+        super(loc);
+        this.label = label;
+    }
+}

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

@@ -0,0 +1,21 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ContinueStatement extends Statement {
+    public final String label;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.nop(loc(), "cont", label));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public ContinueStatement(Location loc, String label) {
+        super(loc);
+        this.label = label;
+    }
+}

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

@@ -0,0 +1,18 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DebugStatement extends Statement {
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.debug());
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public DebugStatement(Location loc) {
+        super(loc);
+    }
+}

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

@@ -0,0 +1,26 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DeleteStatement extends Statement {
+    public final Statement key;
+    public final Statement value;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        value.compile(target, true);
+        key.compile(target, true);
+
+        target.add(Instruction.delete());
+        if (pollute) target.add(Instruction.pushValue(true));
+    }
+
+    public DeleteStatement(Location loc, Statement key, Statement value) {
+        super(loc);
+        this.key = key;
+        this.value = value;
+    }
+}

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

@@ -0,0 +1,36 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DoWhileStatement extends Statement {
+    public final Statement condition, body;
+    public final String label;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        int start = target.size();
+        body.compile(target, false, BreakpointType.STEP_OVER);
+        int mid = target.size();
+        condition.compile(target, true, BreakpointType.STEP_OVER);
+        int end = target.size();
+
+        WhileStatement.replaceBreaks(target, label, start, mid - 1, mid, end + 1);
+        target.add(Instruction.jmpIf(start - end));
+    }
+
+    public DoWhileStatement(Location loc, String label, Statement condition, Statement body) {
+        super(loc);
+        this.label = label;
+        this.condition = condition;
+        this.body = body;
+    }
+}

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

@@ -0,0 +1,69 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ForInStatement extends Statement {
+    public final String varName;
+    public final boolean isDeclaration;
+    public final Statement varValue, object, body;
+    public final String label;
+    public final Location varLocation;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+        if (isDeclaration) target.scope.define(varName);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var key = target.scope.getKey(varName);
+
+        if (key instanceof String) target.add(Instruction.makeVar((String)key));
+
+        if (varValue != null) {
+            varValue.compile(target, true);
+            target.add(Instruction.storeVar(target.scope.getKey(varName)));
+        }
+
+        object.compile(target, true, BreakpointType.STEP_OVER);
+        target.add(Instruction.keys(true));
+
+        int start = target.size();
+        target.add(Instruction.dup());
+        target.add(Instruction.pushUndefined());
+        target.add(Instruction.operation(Operation.EQUALS));
+        int mid = target.temp();
+
+        target.add(Instruction.pushValue("value")).setLocation(varLocation);
+        target.add(Instruction.loadMember()).setLocation(varLocation);
+        target.add(Instruction.storeVar(key)).setLocationAndDebug(object.loc(), BreakpointType.STEP_OVER);
+
+        body.compile(target, false, BreakpointType.STEP_OVER);
+
+        int end = target.size();
+
+        WhileStatement.replaceBreaks(target, label, mid + 1, end, start, end + 1);
+
+        target.add(Instruction.jmp(start - end));
+        target.add(Instruction.discard());
+        target.set(mid, Instruction.jmpIf(end - mid + 1));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public ForInStatement(Location loc, Location varLocation, String label, boolean isDecl, String varName, Statement varValue, Statement object, Statement body) {
+        super(loc);
+        this.varLocation = varLocation;
+        this.label = label;
+        this.isDeclaration = isDecl;
+        this.varName = varName;
+        this.varValue = varValue;
+        this.object = object;
+        this.body = body;
+    }
+}

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

@@ -0,0 +1,45 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ForStatement extends Statement {
+    public final Statement declaration, assignment, condition, body;
+    public final String label;
+
+    @Override
+    public void declare(CompileResult target) {
+        declaration.declare(target);
+        body.declare(target);
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        declaration.compile(target, false, BreakpointType.STEP_OVER);
+
+        int start = target.size();
+        condition.compile(target, true, BreakpointType.STEP_OVER);
+        int mid = target.temp();
+        body.compile(target, false, BreakpointType.STEP_OVER);
+        int beforeAssign = target.size();
+        assignment.compile(target, false, BreakpointType.STEP_OVER);
+        int end = target.size();
+
+        WhileStatement.replaceBreaks(target, label, mid + 1, end, beforeAssign, end + 1);
+
+        target.add(Instruction.jmp(start - end));
+        target.set(mid, Instruction.jmpIfNot(end - mid + 1));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public ForStatement(Location loc, String label, Statement declaration, Statement condition, Statement assignment, Statement body) {
+        super(loc);
+        this.label = label;
+        this.declaration = declaration;
+        this.condition = condition;
+        this.assignment = assignment;
+        this.body = body;
+    }
+}

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

@@ -0,0 +1,48 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class IfStatement extends Statement {
+    public final Statement condition, body, elseBody;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+        if (elseBody != null) elseBody.declare(target);
+    }
+
+    @Override public void compile(CompileResult target, boolean pollute, BreakpointType breakpoint) {
+        condition.compile(target, true, breakpoint);
+
+        if (elseBody == null) {
+            int i = target.temp();
+            body.compile(target, pollute, breakpoint);
+            int endI = target.size();
+            target.set(i, Instruction.jmpIfNot(endI - i));
+        }
+        else {
+            int start = target.temp();
+            body.compile(target, pollute, breakpoint);
+            int mid = target.temp();
+            elseBody.compile(target, pollute, breakpoint);
+            int end = target.size();
+
+            target.set(start, Instruction.jmpIfNot(mid - start + 1));
+            target.set(mid, Instruction.jmp(end - mid));
+        }
+    }
+    @Override public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, BreakpointType.STEP_IN);
+    }
+
+    public IfStatement(Location loc, Statement condition, Statement body, Statement elseBody) {
+        super(loc);
+        this.condition = condition;
+        this.body = body;
+        this.elseBody = elseBody;
+    }
+}

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

@@ -0,0 +1,22 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ReturnStatement extends Statement {
+    public final Statement value;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (value == null) target.add(Instruction.pushUndefined());
+        else value.compile(target, true);
+        target.add(Instruction.ret()).setLocation(loc());
+    }
+
+    public ReturnStatement(Location loc, Statement value) {
+        super(loc);
+        this.value = value;
+    }
+}

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

@@ -0,0 +1,83 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.Instruction.Type;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class SwitchStatement extends Statement {
+    public static class SwitchCase {
+        public final Statement value;
+        public final int statementI;
+
+        public SwitchCase(Statement value, int statementI) {
+            this.value = value;
+            this.statementI = statementI;
+        }
+    }
+
+    public final Statement value;
+    public final SwitchCase[] cases;
+    public final Statement[] body;
+    public final int defaultI;
+
+    @Override
+    public void declare(CompileResult target) {
+        for (var stm : body) stm.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var caseToStatement = new HashMap<Integer, Integer>();
+        var statementToIndex = new HashMap<Integer, Integer>();
+
+        value.compile(target, true, BreakpointType.STEP_OVER);
+
+        for (var ccase : cases) {
+            target.add(Instruction.dup());
+            ccase.value.compile(target, true);
+            target.add(Instruction.operation(Operation.EQUALS));
+            caseToStatement.put(target.temp(), ccase.statementI);
+        }
+
+        int start = target.temp();
+
+        for (var stm : body) {
+            statementToIndex.put(statementToIndex.size(), target.size());
+            stm.compile(target, false, BreakpointType.STEP_OVER);
+        }
+
+        int end = target.size();
+        target.add(Instruction.discard());
+        if (pollute) target.add(Instruction.pushUndefined());
+
+        if (defaultI < 0 || defaultI >= body.length) target.set(start, Instruction.jmp(end - start));
+        else target.set(start, Instruction.jmp(statementToIndex.get(defaultI) - start));
+
+        for (int i = start; i < end; i++) {
+            var instr = target.get(i);
+            if (instr.type == Type.NOP && instr.is(0, "break") && instr.get(1) == null) {
+                target.set(i, Instruction.jmp(end - i));
+            }
+        }
+        for (var el : caseToStatement.entrySet()) {
+            var i = statementToIndex.get(el.getValue());
+            if (i == null) i = end;
+            target.set(el.getKey(), Instruction.jmpIf(i - el.getKey()));
+        }
+
+    }
+
+    public SwitchStatement(Location loc, Statement value, int defaultI, SwitchCase[] cases, Statement[] body) {
+        super(loc);
+        this.value = value;
+        this.defaultI = defaultI;
+        this.cases = cases;
+        this.body = body;
+    }
+}

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

@@ -0,0 +1,21 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ThrowStatement extends Statement {
+    public final Statement value;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        value.compile(target, true);
+        target.add(Instruction.throwInstr()).setLocation(loc());
+    }
+
+    public ThrowStatement(Location loc, Statement value) {
+        super(loc);
+        this.value = value;
+    }
+}

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

@@ -0,0 +1,58 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class TryStatement extends Statement {
+    public final Statement tryBody;
+    public final Statement catchBody;
+    public final Statement finallyBody;
+    public final String name;
+
+    @Override
+    public void declare(CompileResult target) {
+        tryBody.declare(target);
+        if (catchBody != null) catchBody.declare(target);
+        if (finallyBody != null) finallyBody.declare(target);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute, BreakpointType bpt) {
+        int replace = target.temp();
+
+        int start = replace + 1, catchStart = -1, finallyStart = -1;
+
+        tryBody.compile(target, false);
+        target.add(Instruction.tryEnd());
+
+        if (catchBody != null) {
+            catchStart = target.size() - start;
+            target.scope.define(name, true);
+            catchBody.compile(target, false);
+            target.scope.undefine();
+            target.add(Instruction.tryEnd());
+        }
+
+        if (finallyBody != null) {
+            finallyStart = target.size() - start;
+            finallyBody.compile(target, false);
+            target.add(Instruction.tryEnd());
+        }
+
+        target.set(replace, Instruction.tryStart(catchStart, finallyStart, target.size() - start));
+        target.setLocationAndDebug(replace, loc(), BreakpointType.STEP_OVER);
+
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public TryStatement(Location loc, Statement tryBody, Statement catchBody, Statement finallyBody, String name) {
+        super(loc);
+        this.tryBody = tryBody;
+        this.catchBody = catchBody;
+        this.finallyBody = finallyBody;
+        this.name = name;
+    }
+}

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

@@ -0,0 +1,52 @@
+package me.topchetoeu.jscript.compilation.control;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.Instruction.Type;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class WhileStatement extends Statement {
+    public final Statement condition, body;
+    public final String label;
+
+    @Override
+    public void declare(CompileResult target) {
+        body.declare(target);
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        int start = target.size();
+        condition.compile(target, true);
+        int mid = target.temp();
+        body.compile(target, false, BreakpointType.STEP_OVER);
+
+        int end = target.size();
+
+        replaceBreaks(target, label, mid + 1, end, start, end + 1);
+
+        target.add(Instruction.jmp(start - end));
+        target.set(mid, Instruction.jmpIfNot(end - mid + 1));
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public WhileStatement(Location loc, String label, Statement condition, Statement body) {
+        super(loc);
+        this.label = label;
+        this.condition = condition;
+        this.body = body;
+    }
+
+    public static void replaceBreaks(CompileResult 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))) {
+                target.set(i, Instruction.jmp(continuePoint - i));
+            }
+            if (instr.type == Type.NOP && instr.is(0, "break") && (instr.get(1) == null || instr.is(1, label))) {
+                target.set(i, Instruction.jmp(breakPoint - i));
+            }
+        }
+    }
+}

src/java/me/topchetoeu/jscript/compilation/parsing/Operator.java

@@ -1,9 +1,9 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 import java.util.HashMap;
 import java.util.Map;
 
-import me.topchetoeu.jscript.engine.Operation;
+import me.topchetoeu.jscript.common.Operation;
 
 public enum Operator {
     MULTIPLY("*", Operation.MULTIPLY, 13),
@@ -55,7 +55,7 @@ public enum Operator {
     INCREASE("++"),
     DECREASE("--");
 
-    public final String value;
+    public final String readable;
     public final Operation operation;
     public final int precedence;
     public final boolean reverse;
@@ -63,7 +63,7 @@ public enum Operator {
 
     static {
         for (var el : Operator.values()) {
-            ops.put(el.value, el);
+            ops.put(el.readable, el);
         }
     }
 
@@ -74,38 +74,38 @@ public enum Operator {
     }
 
     private Operator() {
-        this.value = null;
+        this.readable = null;
         this.operation = null;
         this.precedence = -1;
         this.reverse = false;
     }
     private Operator(String value) {
-        this. value = value;
+        this.readable = value;
         this.operation = null;
         this.precedence = -1;
         this.reverse = false;
     }
     private Operator(String value, int precedence) {
-        this. value = value;
+        this.readable = value;
         this.operation = null;
         this.precedence = precedence;
         this.reverse = false;
     }
     private Operator(String value, int precedence, boolean reverse) {
-        this. value = value;
+        this.readable = value;
         this.operation = null;
         this.precedence = precedence;
         this.reverse = reverse;
     }
 
     private Operator(String value, Operation funcName, int precedence) {
-        this. value = value;
+        this.readable = value;
         this.operation = funcName;
         this.precedence = precedence;
         this.reverse = false;
     }
     private Operator(String value, Operation funcName, int precedence, boolean reverse) {
-        this.value = value;
+        this.readable = value;
         this.operation = funcName;
         this.precedence = precedence;
         this.reverse = reverse;

src/java/me/topchetoeu/jscript/compilation/parsing/ParseRes.java

@@ -1,10 +1,10 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 import java.util.List;
 import java.util.Map;
 
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Location;
-import me.topchetoeu.jscript.parsing.Parsing.Parser;
+import me.topchetoeu.jscript.compilation.parsing.Parsing.Parser;
 
 public class ParseRes<T> {
     public static enum State {
@@ -69,6 +69,9 @@ public class ParseRes<T> {
 
     @SafeVarargs
     public static <T> ParseRes<? extends T> any(ParseRes<? extends T> ...parsers) {
+        return any(List.of(parsers));
+    }
+    public static <T> ParseRes<? extends T> any(List<ParseRes<? extends T>> parsers) {
         ParseRes<? extends T> best = null;
         ParseRes<? extends T> error = ParseRes.failed();
 

src/java/me/topchetoeu/jscript/compilation/parsing/Parsing.java

@@ -1,44 +1,45 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
 
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
 import me.topchetoeu.jscript.compilation.*;
-import me.topchetoeu.jscript.compilation.Instruction.Type;
 import me.topchetoeu.jscript.compilation.VariableDeclareStatement.Pair;
 import me.topchetoeu.jscript.compilation.control.*;
 import me.topchetoeu.jscript.compilation.control.SwitchStatement.SwitchCase;
+import me.topchetoeu.jscript.compilation.parsing.ParseRes.State;
 import me.topchetoeu.jscript.compilation.values.*;
-import me.topchetoeu.jscript.engine.Environment;
+import me.topchetoeu.jscript.core.scope.LocalScopeRecord;
-import me.topchetoeu.jscript.engine.Operation;
+import me.topchetoeu.jscript.core.exceptions.SyntaxException;
-import me.topchetoeu.jscript.engine.scope.ValueVariable;
-import me.topchetoeu.jscript.engine.values.CodeFunction;
-import me.topchetoeu.jscript.engine.values.Values;
-import me.topchetoeu.jscript.exceptions.SyntaxException;
-import me.topchetoeu.jscript.parsing.ParseRes.State;
 
 // TODO: this has to be rewritten
 public class Parsing {
     public static interface Parser<T> {
-        ParseRes<T> parse(String filename, List<Token> tokens, int i);
+        ParseRes<T> parse(Filename filename, List<Token> tokens, int i);
     }
 
     private static class ObjProp {
-        public final Object name;
+        public final String name;
         public final String access;
         public final FunctionStatement func;
 
-        public ObjProp(Object name, String access, FunctionStatement func) {
+        public ObjProp(String name, String access, FunctionStatement func) {
             this.name = name;
             this.access = access;
             this.func = func;
         }
     }
 
+    public static final HashMap<Long, ArrayList<Instruction>> functions = new HashMap<>();
+
     private static final HashSet<String> reserved = new HashSet<String>();
     static {
         reserved.add("true");
@@ -66,7 +67,7 @@ public class Parsing {
         reserved.add("delete");
         reserved.add("break");
         reserved.add("continue");
-        reserved.add("debug");
+        reserved.add("debugger");
         reserved.add("implements");
         reserved.add("interface");
         reserved.add("package");
@@ -77,8 +78,6 @@ public class Parsing {
         // Although ES5 allow these, we will comply to ES6 here
         reserved.add("const");
         reserved.add("let");
-        reserved.add("async");
-        reserved.add("super");
         // These are allowed too, however our parser considers them keywords
         reserved.add("undefined");
         reserved.add("arguments");
@@ -88,7 +87,6 @@ public class Parsing {
         // We allow yield and await, because they're part of the custom async and generator functions
     }
 
-
     public static boolean isDigit(char c) {
         return c >= '0' && c <= '9';
     }
@@ -119,7 +117,7 @@ public class Parsing {
     private static final int CURR_MULTI_COMMENT = 8;
     private static final int CURR_SINGLE_COMMENT = 9;
 
-    private static void addToken(StringBuilder currToken, int currStage, int line, int lastStart, String filename, List<RawToken> tokens) {
+    private static void addToken(StringBuilder currToken, int currStage, int line, int lastStart, Filename filename, List<RawToken> tokens) {
         var res = currToken.toString();
 
         switch (currStage) {
@@ -140,7 +138,7 @@ public class Parsing {
 
     // This method is so long because we're tokenizing the string using an iterative approach
     // instead of a recursive descent parser. This is mainly done for performance reasons.
-    private static ArrayList<RawToken> splitTokens(String filename, String raw) {
+    private static ArrayList<RawToken> splitTokens(Filename filename, String raw) {
         var tokens = new ArrayList<RawToken>();
         var currToken = new StringBuilder(64);
 
@@ -216,8 +214,10 @@ public class Parsing {
                     currToken.append(c);
                     continue;
                 case CURR_SCIENTIFIC_NOT:
-                    if (c == '-') currStage = CURR_NEG_SCIENTIFIC_NOT;
+                    if (c == '-') {
-                    else if (!isDigit(c)) {
+                        if (currToken.toString().endsWith("e")) currStage = CURR_NEG_SCIENTIFIC_NOT;
+                    }
+                    if (currStage == CURR_SCIENTIFIC_NOT && !isDigit(c)) {
                         i--; start--;
                         break;
                     }
@@ -254,7 +254,7 @@ public class Parsing {
                     }
                     break;
                 case CURR_LITERAL:
-                    if (isAlphanumeric(c) || c == '_') {
+                    if (isAlphanumeric(c) || c == '_' || c == '$') {
                         currToken.append(c);
                         continue;
                     }
@@ -394,13 +394,17 @@ public class Parsing {
         return tokens;
     }
 
-    private static int fromHex(char c) {
+    public static int fromHex(char c) {
         if (c >= 'A' && c <= 'F') return c - 'A' + 10;
         if (c >= 'a' && c <= 'f') return c - 'a' + 10;
         if (c >= '0' && c <= '9') return c - '0';
         return -1;
     }
 
+    private static boolean inBounds(List<Token> tokens, int i) {
+        return i >= 0 && i < tokens.size();
+    }
+
     private static String parseString(Location loc, String literal) {
         var res = new StringBuilder();
 
@@ -565,20 +569,21 @@ public class Parsing {
     }
     private static double parseNumber(Location loc, String value) {
         var res = parseNumber(false, value);
-        if (res == null) throw new SyntaxException(loc, "Invalid number format.");
+        if (res == null)
+            throw new SyntaxException(loc, "Invalid number format.");
         else return res;
     }
 
-    private static List<Token> parseTokens(String filename, Collection<RawToken> tokens) {
+    private static List<Token> parseTokens(Filename filename, Collection<RawToken> tokens) {
         var res = new ArrayList<Token>();
 
         for (var el : tokens) {
             var loc = new Location(el.line, el.start, filename);
             switch (el.type) {
                 case LITERAL: res.add(Token.identifier(el.line, el.start, el.value)); break;
-                case NUMBER: res.add(Token.number(el.line, el.start, parseNumber(loc, el.value))); break;
+                case NUMBER: res.add(Token.number(el.line, el.start, parseNumber(loc, el.value), el.value)); break;
-                case STRING: res.add(Token.string(el.line, el.start, parseString(loc, el.value))); break;
+                case STRING: res.add(Token.string(el.line, el.start, parseString(loc, el.value), el.value)); break;
-                case REGEX: res.add(Token.regex(el.line, el.start, parseRegex(loc, el.value))); break;
+                case REGEX: res.add(Token.regex(el.line, el.start, parseRegex(loc, el.value), el.value)); break;
                 case OPERATOR:
                     Operator op = Operator.parse(el.value);
                     if (op == null) throw new SyntaxException(loc, String.format("Unrecognized operator '%s'.", el.value));
@@ -590,11 +595,11 @@ public class Parsing {
         return res;
     }
 
-    public static List<Token> tokenize(String filename, String raw) {
+    public static List<Token> tokenize(Filename filename, String raw) {
         return parseTokens(filename, splitTokens(filename, raw));
     }
 
-    public static Location getLoc(String filename, List<Token> tokens, int i) {
+    public static Location getLoc(Filename filename, List<Token> tokens, int i) {
         if (tokens.size() == 0 || tokens.size() == 0) return new Location(1, 1, filename);
         if (i >= tokens.size()) i = tokens.size() - 1;
         return new Location(tokens.get(i).line, tokens.get(i).start, filename);
@@ -605,49 +610,41 @@ public class Parsing {
     }
 
     public static ParseRes<String> parseIdentifier(List<Token> tokens, int i) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isIdentifier()) {
                 return ParseRes.res(tokens.get(i).identifier(), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
+        else return ParseRes.failed();
-            return ParseRes.failed();
-        }
     }
     public static ParseRes<Operator> parseOperator(List<Token> tokens, int i) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isOperator()) {
                 return ParseRes.res(tokens.get(i).operator(), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
+        else return ParseRes.failed();
-            return ParseRes.failed();
-        }
     }
 
     public static boolean isIdentifier(List<Token> tokens, int i, String lit) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isIdentifier(lit)) {
                 return true;
             }
             else return false;
         }
-        catch (IndexOutOfBoundsException e) {
+        else return false;
-            return false;
-        }
     }
     public static boolean isOperator(List<Token> tokens, int i, Operator op) {
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isOperator(op)) {
                 return true;
             }
             else return false;
         }
-        catch (IndexOutOfBoundsException e) {
+        else return false;
-            return false;
-        }
     }
     public static boolean isStatementEnd(List<Token> tokens, int i) {
         if (isOperator(tokens, i, Operator.SEMICOLON)) return true;
@@ -660,34 +657,29 @@ public class Parsing {
         return !reserved.contains(name);
     }
 
-    public static ParseRes<ConstantStatement> parseString(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ConstantStatement> parseString(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isString()) {
                 return ParseRes.res(new ConstantStatement(loc, tokens.get(i).string()), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
+        else return ParseRes.failed();
-            return ParseRes.failed();
-        }
     }
-    public static ParseRes<ConstantStatement> parseNumber(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ConstantStatement> parseNumber(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isNumber()) {
                 return ParseRes.res(new ConstantStatement(loc, tokens.get(i).number()), 1);
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
+        else return ParseRes.failed();
-            return ParseRes.failed();
-        }
-
     }
-    public static ParseRes<RegexStatement> parseRegex(String filename, List<Token> tokens, int i) {
+    public static ParseRes<RegexStatement> parseRegex(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
-        try {
+        if (inBounds(tokens, i)) {
             if (tokens.get(i).isRegex()) {
                 var val = tokens.get(i).regex();
                 var index = val.lastIndexOf('/');
@@ -697,12 +689,10 @@ public class Parsing {
             }
             else return ParseRes.failed();
         }
-        catch (IndexOutOfBoundsException e) {
+        return ParseRes.failed();
-            return ParseRes.failed();
-        }
     }
 
-    public static ParseRes<ArrayStatement> parseArray(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ArrayStatement> parseArray(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.BRACKET_OPEN)) return ParseRes.failed();
@@ -741,7 +731,7 @@ public class Parsing {
         return ParseRes.res(new ArrayStatement(loc, values.toArray(Statement[]::new)), n);
     }
 
-    public static ParseRes<List<String>> parseParamList(String filename, List<Token> tokens, int i) {
+    public static ParseRes<List<String>> parseParamList(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -773,17 +763,18 @@ public class Parsing {
         return ParseRes.res(args, n);
     }
 
-    public static ParseRes<? extends Object> parsePropName(String filename, List<Token> tokens, int i) {
+    public static ParseRes<String> parsePropName(Filename filename, List<Token> tokens, int i) {
-        var idRes = parseIdentifier(tokens, i);
+        var loc = getLoc(filename, tokens, i);
-        if (idRes.isSuccess()) return ParseRes.res(idRes.result, 1);
-        var strRes = parseString(null, tokens, i);
-        if (strRes.isSuccess()) return ParseRes.res(strRes.result.value, 1);
-        var numRes = parseNumber(null, tokens, i);
-        if (numRes.isSuccess()) return ParseRes.res(numRes.result.value, 1);
 
-        return ParseRes.failed();
+        if (inBounds(tokens, i)) {
+            var token = tokens.get(i);
+
+            if (token.isNumber() || token.isIdentifier() || token.isString()) return ParseRes.res(token.rawValue, 1);
+            else return ParseRes.error(loc, "Expected identifier, string or number literal.");
+        }
+        else return ParseRes.failed();
     }
-    public static ParseRes<ObjProp> parseObjectProp(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ObjProp> parseObjectProp(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -805,19 +796,21 @@ public class Parsing {
         if (!res.isSuccess()) return ParseRes.error(loc, "Expected a compound statement for property accessor.", res);
         n += res.n;
 
+        var end = getLoc(filename, tokens, i + n - 1);
+
         return ParseRes.res(new ObjProp(
             name, access,
-            new FunctionStatement(loc, access + " " + name.toString(), argsRes.result.toArray(String[]::new), res.result)
+            new FunctionStatement(loc, end, access + " " + name.toString(), argsRes.result.toArray(String[]::new), false, res.result)
         ), n);
     }
-    public static ParseRes<ObjectStatement> parseObject(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ObjectStatement> parseObject(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.BRACE_OPEN)) return ParseRes.failed();
 
-        var values = new LinkedHashMap<Object, Statement>();
+        var values = new LinkedHashMap<String, Statement>();
-        var getters = new LinkedHashMap<Object, FunctionStatement>();
+        var getters = new LinkedHashMap<String, FunctionStatement>();
-        var setters = new LinkedHashMap<Object, FunctionStatement>();
+        var setters = new LinkedHashMap<String, FunctionStatement>();
 
         if (isOperator(tokens, i + n, Operator.BRACE_CLOSE)) {
             n++;
@@ -867,7 +860,7 @@ public class Parsing {
 
         return ParseRes.res(new ObjectStatement(loc, values, getters, setters), n);
     }
-    public static ParseRes<NewStatement> parseNew(String filename, List<Token> tokens, int i) {
+    public static ParseRes<CallStatement> parseNew(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
         if (!isIdentifier(tokens, i + n++, "new")) return ParseRes.failed();
@@ -878,12 +871,12 @@ public class Parsing {
         var callRes = parseCall(filename, tokens, i + n, valRes.result, 0);
         n += callRes.n;
         if (callRes.isError()) return callRes.transform();
-        else if (callRes.isFailed()) return ParseRes.res(new NewStatement(loc, valRes.result), n);
+        else if (callRes.isFailed()) return ParseRes.res(new CallStatement(loc, true, valRes.result), n);
         var call = (CallStatement)callRes.result;
 
-        return ParseRes.res(new NewStatement(loc, call.func, call.args), n);
+        return ParseRes.res(new CallStatement(loc, true, call.func, call.args), n);
     }
-    public static ParseRes<TypeofStatement> parseTypeof(String filename, List<Token> tokens, int i) {
+    public static ParseRes<TypeofStatement> parseTypeof(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
         if (!isIdentifier(tokens, i + n++, "typeof")) return ParseRes.failed();
@@ -894,7 +887,7 @@ public class Parsing {
 
         return ParseRes.res(new TypeofStatement(loc, valRes.result), n);
     }
-    public static ParseRes<VoidStatement> parseVoid(String filename, List<Token> tokens, int i) {
+    public static ParseRes<DiscardStatement> parseVoid(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
         if (!isIdentifier(tokens, i + n++, "void")) return ParseRes.failed();
@@ -903,9 +896,9 @@ public class Parsing {
         if (!valRes.isSuccess()) return ParseRes.error(loc, "Expected a value after 'void' keyword.", valRes);
         n += valRes.n;
 
-        return ParseRes.res(new VoidStatement(loc, valRes.result), n);
+        return ParseRes.res(new DiscardStatement(loc, valRes.result), n);
     }
-    public static ParseRes<? extends Statement> parseDelete(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseDelete(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "delete")) return ParseRes.failed();
@@ -926,7 +919,7 @@ public class Parsing {
         }
     }
 
-    public static ParseRes<FunctionStatement> parseFunction(String filename, List<Token> tokens, int i, boolean statement) {
+    public static ParseRes<FunctionStatement> parseFunction(Filename filename, List<Token> tokens, int i, boolean statement) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -964,12 +957,13 @@ public class Parsing {
 
         var res = parseCompound(filename, tokens, i + n);
         n += res.n;
+        var end = getLoc(filename, tokens, i + n - 1);
 
-        if (res.isSuccess()) return ParseRes.res(new FunctionStatement(loc, name, args.toArray(String[]::new), res.result), n);
+        if (res.isSuccess()) return ParseRes.res(new FunctionStatement(loc, end, name, args.toArray(String[]::new), statement, res.result), n);
         else return ParseRes.error(loc, "Expected a compound statement for function.", res);
     }
 
-    public static ParseRes<OperationStatement> parseUnary(String filename, List<Token> tokens, int i) {
+    public static ParseRes<OperationStatement> parseUnary(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -988,9 +982,9 @@ public class Parsing {
         var res = parseValue(filename, tokens, n + i, 14);
 
         if (res.isSuccess()) return ParseRes.res(new OperationStatement(loc, operation, res.result), n + res.n);
-        else return ParseRes.error(loc, String.format("Expected a value after the unary operator '%s'.", op.value), res);
+        else return ParseRes.error(loc, String.format("Expected a value after the unary operator '%s'.", op.readable), res);
     }
-    public static ParseRes<ChangeStatement> parsePrefixChange(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ChangeStatement> parsePrefixChange(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1007,7 +1001,7 @@ public class Parsing {
         if (!(res.result instanceof AssignableStatement)) return ParseRes.error(loc, "Expected assignable value after prefix operator.");
         return ParseRes.res(new ChangeStatement(loc, (AssignableStatement)res.result, change, false), n + res.n);
     }
-    public static ParseRes<? extends Statement> parseParens(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseParens(Filename filename, List<Token> tokens, int i) {
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.PAREN_OPEN)) return ParseRes.failed();
 
@@ -1019,9 +1013,8 @@ public class Parsing {
 
         return ParseRes.res(res.result, n);
     }
-    @SuppressWarnings("all")
+    public static ParseRes<? extends Statement> parseSimple(Filename filename, List<Token> tokens, int i, boolean statement) {
-    public static ParseRes<? extends Statement> parseSimple(String filename, List<Token> tokens, int i, boolean statement) {
+        var res = new ArrayList<ParseRes<? extends Statement>>();
-        var res = new ArrayList<>();
 
         if (!statement) {
             res.add(parseObject(filename, tokens, i));
@@ -1044,10 +1037,10 @@ public class Parsing {
             parseDelete(filename, tokens, i)
         ));
 
-        return ParseRes.any(res.toArray(ParseRes[]::new));
+        return ParseRes.any(res);
     }
 
-    public static ParseRes<VariableStatement> parseVariable(String filename, List<Token> tokens, int i) {
+    public static ParseRes<VariableStatement> parseVariable(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var literal = parseIdentifier(tokens, i);
 
@@ -1055,7 +1048,6 @@ public class Parsing {
 
         if (!checkVarName(literal.result)) {
             if (literal.result.equals("await")) return ParseRes.error(loc, "'await' expressions are not supported.");
-            if (literal.result.equals("async")) return ParseRes.error(loc, "'async' is not supported.");
             if (literal.result.equals("const")) return ParseRes.error(loc, "'const' declarations are not supported.");
             if (literal.result.equals("let")) return ParseRes.error(loc, "'let' declarations are not supported.");
             return ParseRes.error(loc, String.format("Unexpected identifier '%s'.", literal.result));
@@ -1063,7 +1055,7 @@ public class Parsing {
 
         return ParseRes.res(new VariableStatement(loc, literal.result), 1);
     }
-    public static ParseRes<? extends Statement> parseLiteral(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseLiteral(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         var id = parseIdentifier(tokens, i);
         if (!id.isSuccess()) return id.transform();
@@ -1075,10 +1067,10 @@ public class Parsing {
             return ParseRes.res(new ConstantStatement(loc, false), 1);
         }
         if (id.result.equals("undefined")) {
-            return ParseRes.res(new ConstantStatement(loc, null), 1);
+            return ParseRes.res(ConstantStatement.ofUndefined(loc), 1);
         }
         if (id.result.equals("null")) {
-            return ParseRes.res(new ConstantStatement(loc, Values.NULL), 1);
+            return ParseRes.res(ConstantStatement.ofNull(loc), 1);
         }
         if (id.result.equals("this")) {
             return ParseRes.res(new VariableIndexStatement(loc, 0), 1);
@@ -1091,7 +1083,7 @@ public class Parsing {
         }
         return ParseRes.failed();
     }
-    public static ParseRes<IndexStatement> parseMember(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<IndexStatement> parseMember(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1104,7 +1096,7 @@ public class Parsing {
 
         return ParseRes.res(new IndexStatement(loc, prev, new ConstantStatement(loc, literal.result)), n);
     }
-    public static ParseRes<IndexStatement> parseIndex(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<IndexStatement> parseIndex(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1120,7 +1112,7 @@ public class Parsing {
 
         return ParseRes.res(new IndexStatement(loc, prev, valRes.result), n);
     }
-    public static ParseRes<? extends Statement> parseAssign(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<? extends Statement> parseAssign(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0 ;
 
@@ -1132,10 +1124,12 @@ public class Parsing {
         var op = opRes.result;
         if (!op.isAssign()) return ParseRes.failed();
 
-        if (!(prev instanceof AssignableStatement)) return ParseRes.error(loc, "Invalid expression on left hand side of assign operator.");
+        if (!(prev instanceof AssignableStatement)) {
+            return ParseRes.error(loc, "Invalid expression on left hand side of assign operator.");
+        }
 
         var res = parseValue(filename, tokens, i + n, 2);
-        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected value after assignment operator '%s'.", op.value), res);
+        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected value after assignment operator '%s'.", op.readable), res);
         n += res.n;
 
         Operation operation = null;
@@ -1154,7 +1148,7 @@ public class Parsing {
 
         return ParseRes.res(((AssignableStatement)prev).toAssign(res.result, operation), n);
     }
-    public static ParseRes<CallStatement> parseCall(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<CallStatement> parseCall(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1172,8 +1166,7 @@ public class Parsing {
                 prevArg = true;
             }
             else if (argRes.isError()) return argRes.transform();
-            else if (isOperator(tokens, i + n, Operator.COMMA)) {
+            else if (prevArg && isOperator(tokens, i + n, Operator.COMMA)) {
-                if (!prevArg) args.add(null);
                 prevArg = false;
                 n++;
             }
@@ -1181,12 +1174,12 @@ public class Parsing {
                 n++;
                 break;
             }
-            else return ParseRes.failed();
+            else return ParseRes.error(getLoc(filename, tokens, i + n), prevArg ? "Expected a comma or a closing paren." : "Expected an expression or a closing paren.");
         }
 
-        return ParseRes.res(new CallStatement(loc, prev, args.toArray(Statement[]::new)), n);
+        return ParseRes.res(new CallStatement(loc, false, prev, args.toArray(Statement[]::new)), n);
     }
-    public static ParseRes<ChangeStatement> parsePostfixChange(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<ChangeStatement> parsePostfixChange(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1204,7 +1197,7 @@ public class Parsing {
         if (!(prev instanceof AssignableStatement)) return ParseRes.error(loc, "Expected assignable value before suffix operator.");
         return ParseRes.res(new ChangeStatement(loc, (AssignableStatement)prev, change, true), n);
     }
-    public static ParseRes<OperationStatement> parseInstanceof(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<OperationStatement> parseInstanceof(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1217,7 +1210,7 @@ public class Parsing {
 
         return ParseRes.res(new OperationStatement(loc, Operation.INSTANCEOF, prev, valRes.result), n);
     }
-    public static ParseRes<OperationStatement> parseIn(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<OperationStatement> parseIn(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1230,7 +1223,7 @@ public class Parsing {
 
         return ParseRes.res(new OperationStatement(loc, Operation.IN, prev, valRes.result), n);
     }
-    public static ParseRes<CommaStatement> parseComma(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<CompoundStatement> parseComma(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1241,9 +1234,9 @@ public class Parsing {
         if (!res.isSuccess()) return ParseRes.error(loc, "Expected a value after the comma.", res);
         n += res.n;
 
-        return ParseRes.res(new CommaStatement(loc, prev, res.result), n);
+        return ParseRes.res(new CompoundStatement(loc, false, prev, res.result), n);
     }
-    public static ParseRes<TernaryStatement> parseTernary(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<IfStatement> parseTernary(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1260,9 +1253,9 @@ public class Parsing {
         if (!b.isSuccess()) return ParseRes.error(loc, "Expected a second value after the ternary operator.", b);
         n += b.n;
 
-        return ParseRes.res(new TernaryStatement(loc, prev, a.result, b.result), n);
+        return ParseRes.res(new IfStatement(loc, prev, a.result, b.result), n);
     }
-    public static ParseRes<? extends Statement> parseOperator(String filename, List<Token> tokens, int i, Statement prev, int precedence) {
+    public static ParseRes<? extends Statement> parseOperator(Filename filename, List<Token> tokens, int i, Statement prev, int precedence) {
         var loc = getLoc(filename, tokens, i);
         var n = 0;
 
@@ -1274,7 +1267,7 @@ public class Parsing {
         if (op.isAssign()) return parseAssign(filename, tokens, i + n - 1, prev, precedence);
 
         var res = parseValue(filename, tokens, i + n, op.precedence + (op.reverse ? 0 : 1));
-        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected a value after the '%s' operator.", op.value), res);
+        if (!res.isSuccess()) return ParseRes.error(loc, String.format("Expected a value after the '%s' operator.", op.readable), res);
         n += res.n;
 
         if (op == Operator.LAZY_AND) {
@@ -1287,7 +1280,7 @@ public class Parsing {
         return ParseRes.res(new OperationStatement(loc, op.operation, prev, res.result), n);
     }
 
-    public static ParseRes<? extends Statement> parseValue(String filename, List<Token> tokens, int i, int precedence, boolean statement) {
+    public static ParseRes<? extends Statement> parseValue(Filename filename, List<Token> tokens, int i, int precedence, boolean statement) {
         Statement prev = null;
         int n = 0;
 
@@ -1328,16 +1321,15 @@ public class Parsing {
         if (prev == null) return ParseRes.failed();
         else return ParseRes.res(prev, n);
     }
-    public static ParseRes<? extends Statement> parseValue(String filename, List<Token> tokens, int i, int precedence) {
+    public static ParseRes<? extends Statement> parseValue(Filename filename, List<Token> tokens, int i, int precedence) {
         return parseValue(filename, tokens, i, precedence, false);
     }
 
-    public static ParseRes<? extends Statement> parseValueStatement(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseValueStatement(Filename filename, List<Token> tokens, int i) {
-        var loc = getLoc(filename, tokens, i);
         var valRes = parseValue(filename, tokens, i, 0, true);
         if (!valRes.isSuccess()) return valRes.transform();
 
-        valRes.result.setLoc(loc);
+        // valRes.result.setLoc(loc);
         var res = ParseRes.res(valRes.result, valRes.n);
 
         if (isStatementEnd(tokens, i + res.n)) {
@@ -1349,7 +1341,7 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.", res);
     }
-    public static ParseRes<VariableDeclareStatement> parseVariableDeclare(String filename, List<Token> tokens, int i) {
+    public static ParseRes<VariableDeclareStatement> parseVariableDeclare(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "var")) return ParseRes.failed();
@@ -1362,6 +1354,7 @@ public class Parsing {
         }
 
         while (true) {
+            var nameLoc = getLoc(filename, tokens, i + n);
             var nameRes = parseIdentifier(tokens, i + n++);
             if (!nameRes.isSuccess()) return ParseRes.error(loc, "Expected a variable name.");
 
@@ -1379,7 +1372,7 @@ public class Parsing {
                 val = valRes.result;
             }
 
-            res.add(new Pair(nameRes.result, val));
+            res.add(new Pair(nameRes.result, val, nameLoc));
             
             if (isOperator(tokens, i + n, Operator.COMMA)) {
                 n++;
@@ -1393,7 +1386,7 @@ public class Parsing {
         }
     }
 
-    public static ParseRes<ReturnStatement> parseReturn(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ReturnStatement> parseReturn(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "return")) return ParseRes.failed();
@@ -1405,8 +1398,7 @@ public class Parsing {
 
         var valRes = parseValue(filename, tokens, i + n, 0);
         n += valRes.n;
-        if (valRes.isError())
+        if (valRes.isError()) return ParseRes.error(loc, "Expected a return value.", valRes);
-            return ParseRes.error(loc, "Expected a return value.", valRes);
 
         var res = ParseRes.res(new ReturnStatement(loc, valRes.result), n);
 
@@ -1417,7 +1409,7 @@ public class Parsing {
         else
             return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.", valRes);
     }
-    public static ParseRes<ThrowStatement> parseThrow(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ThrowStatement> parseThrow(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isIdentifier(tokens, i + n++, "throw")) return ParseRes.failed();
@@ -1435,7 +1427,7 @@ public class Parsing {
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.", valRes);
     }
 
-    public static ParseRes<BreakStatement> parseBreak(String filename, List<Token> tokens, int i) {
+    public static ParseRes<BreakStatement> parseBreak(Filename filename, List<Token> tokens, int i) {
         if (!isIdentifier(tokens, i, "break")) return ParseRes.failed();
 
         if (isStatementEnd(tokens, i + 1)) {
@@ -1453,7 +1445,7 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.");
     }
-    public static ParseRes<ContinueStatement> parseContinue(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ContinueStatement> parseContinue(Filename filename, List<Token> tokens, int i) {
         if (!isIdentifier(tokens, i, "continue")) return ParseRes.failed();
 
         if (isStatementEnd(tokens, i + 1)) {
@@ -1471,8 +1463,8 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.");
     }
-    public static ParseRes<DebugStatement> parseDebug(String filename, List<Token> tokens, int i) {
+    public static ParseRes<DebugStatement> parseDebug(Filename filename, List<Token> tokens, int i) {
-        if (!isIdentifier(tokens, i, "debug")) return ParseRes.failed();
+        if (!isIdentifier(tokens, i, "debugger")) return ParseRes.failed();
 
         if (isStatementEnd(tokens, i + 1)) {
             if (isOperator(tokens, i + 1, Operator.SEMICOLON)) return ParseRes.res(new DebugStatement(getLoc(filename, tokens, i)), 2);
@@ -1481,7 +1473,7 @@ public class Parsing {
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected an end of statement.");
     }
 
-    public static ParseRes<CompoundStatement> parseCompound(String filename, List<Token> tokens, int i) {
+    public static ParseRes<CompoundStatement> parseCompound(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
         if (!isOperator(tokens, i + n++, Operator.BRACE_OPEN)) return ParseRes.failed();
@@ -1507,7 +1499,7 @@ public class Parsing {
             statements.add(res.result);
         }
 
-        return ParseRes.res(new CompoundStatement(loc, statements.toArray(Statement[]::new)), n);
+        return ParseRes.res(new CompoundStatement(loc, true, statements.toArray(Statement[]::new)).setEnd(getLoc(filename, tokens, i + n - 1)), n);
     }
     public static ParseRes<String> parseLabel(List<Token> tokens, int i) {
         int n = 0;
@@ -1517,7 +1509,7 @@ public class Parsing {
 
         return ParseRes.res(nameRes.result, n);
     }
-    public static ParseRes<IfStatement> parseIf(String filename, List<Token> tokens, int i) {
+    public static ParseRes<IfStatement> parseIf(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1528,8 +1520,7 @@ public class Parsing {
         if (!condRes.isSuccess()) return ParseRes.error(loc, "Expected an if condition.", condRes);
         n += condRes.n;
 
-        if (!isOperator(tokens, i + n++, Operator.PAREN_CLOSE))
+        if (!isOperator(tokens, i + n++, Operator.PAREN_CLOSE)) return ParseRes.error(loc, "Expected a closing paren after if condition.");
-            return ParseRes.error(loc, "Expected a closing paren after if condition.");
 
         var res = parseStatement(filename, tokens, i + n);
         if (!res.isSuccess()) return ParseRes.error(loc, "Expected an if body.", res);
@@ -1544,7 +1535,7 @@ public class Parsing {
     
         return ParseRes.res(new IfStatement(loc, condRes.result, res.result, elseRes.result), n);
     }
-    public static ParseRes<WhileStatement> parseWhile(String filename, List<Token> tokens, int i) {
+    public static ParseRes<WhileStatement> parseWhile(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1566,7 +1557,7 @@ public class Parsing {
 
         return ParseRes.res(new WhileStatement(loc, labelRes.result, condRes.result, res.result), n);
     }
-    public static ParseRes<Statement> parseSwitchCase(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Statement> parseSwitchCase(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1586,7 +1577,7 @@ public class Parsing {
 
         return ParseRes.res(null, 2);
     }
-    public static ParseRes<SwitchStatement> parseSwitch(String filename, List<Token> tokens, int i) {
+    public static ParseRes<SwitchStatement> parseSwitch(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1646,7 +1637,7 @@ public class Parsing {
             statements.toArray(Statement[]::new)
         ), n);
     }
-    public static ParseRes<DoWhileStatement> parseDoWhile(String filename, List<Token> tokens, int i) {
+    public static ParseRes<DoWhileStatement> parseDoWhile(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1675,7 +1666,7 @@ public class Parsing {
         }
         else return ParseRes.error(getLoc(filename, tokens, i), "Expected a semicolon.");
     }
-    public static ParseRes<Statement> parseFor(String filename, List<Token> tokens, int i) {
+    public static ParseRes<Statement> parseFor(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1689,15 +1680,14 @@ public class Parsing {
 
         if (isOperator(tokens, i + n, Operator.SEMICOLON)) {
             n++;
-            decl = new CompoundStatement(loc);
+            decl = new CompoundStatement(loc, false);
         }
         else {
             var declRes = ParseRes.any(
                 parseVariableDeclare(filename, tokens, i + n),
                 parseValueStatement(filename, tokens, i + n)
             );
-            if (!declRes.isSuccess())
+            if (!declRes.isSuccess()) return ParseRes.error(loc, "Expected a declaration or an expression.", declRes);
-                return ParseRes.error(loc, "Expected a declaration or an expression.", declRes);
             n += declRes.n;
             decl = declRes.result;
         }
@@ -1716,7 +1706,7 @@ public class Parsing {
 
         if (isOperator(tokens, i + n, Operator.PAREN_CLOSE)) {
             n++;
-            inc = new CompoundStatement(loc);
+            inc = new CompoundStatement(loc, false);
         }
         else {
             var incRes = parseValue(filename, tokens, i + n, 0);
@@ -1733,7 +1723,7 @@ public class Parsing {
 
         return ParseRes.res(new ForStatement(loc, labelRes.result, decl, cond, inc, res.result), n);
     }
-    public static ParseRes<ForInStatement> parseForIn(String filename, List<Token> tokens, int i) {
+    public static ParseRes<ForInStatement> parseForIn(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1751,6 +1741,7 @@ public class Parsing {
 
         var nameRes = parseIdentifier(tokens, i + n);
         if (!nameRes.isSuccess()) return ParseRes.error(loc, "Expected a variable name for 'for' loop.");
+        var nameLoc = getLoc(filename, tokens, i + n);
         n += nameRes.n;
 
         Statement varVal = null;
@@ -1784,9 +1775,9 @@ public class Parsing {
         if (!bodyRes.isSuccess()) return ParseRes.error(loc, "Expected a for body.", bodyRes);
         n += bodyRes.n;
 
-        return ParseRes.res(new ForInStatement(loc, labelRes.result, isDecl, nameRes.result, varVal, objRes.result, bodyRes.result), n);
+        return ParseRes.res(new ForInStatement(loc, nameLoc, labelRes.result, isDecl, nameRes.result, varVal, objRes.result, bodyRes.result), n);
     }
-    public static ParseRes<TryStatement> parseCatch(String filename, List<Token> tokens, int i) {
+    public static ParseRes<TryStatement> parseCatch(Filename filename, List<Token> tokens, int i) {
         var loc = getLoc(filename, tokens, i);
         int n = 0;
 
@@ -1827,8 +1818,8 @@ public class Parsing {
         return ParseRes.res(new TryStatement(loc, res.result, catchBody, finallyBody, name), n);
     }
 
-    public static ParseRes<? extends Statement> parseStatement(String filename, List<Token> tokens, int i) {
+    public static ParseRes<? extends Statement> parseStatement(Filename filename, List<Token> tokens, int i) {
-        if (isOperator(tokens, i, Operator.SEMICOLON)) return ParseRes.res(new CompoundStatement(getLoc(filename, tokens, i)), 1);
+        if (isOperator(tokens, i, Operator.SEMICOLON)) return ParseRes.res(new CompoundStatement(getLoc(filename, tokens, i), false), 1);
         if (isIdentifier(tokens, i, "with")) return ParseRes.error(getLoc(filename, tokens, i), "'with' statements are not allowed.");
         return ParseRes.any(
             parseVariableDeclare(filename, tokens, i),
@@ -1850,7 +1841,7 @@ public class Parsing {
         );
     }
 
-    public static Statement[] parse(String filename, String raw) {
+    public static Statement[] parse(Filename filename, String raw) {
         var tokens = tokenize(filename, raw);
         var list = new ArrayList<Statement>();
         int i = 0;
@@ -1871,42 +1862,31 @@ public class Parsing {
         return list.toArray(Statement[]::new);
     }
 
-    public static CodeFunction compile(Environment environment, Statement ...statements) {
+    public static CompileResult compile(Statement ...statements) {
-        var target = environment.global.globalChild();
+        var target = new CompileResult(new LocalScopeRecord());
-        var subscope = target.child();
+        var stm = new CompoundStatement(null, true, statements);
-        var res = new ArrayList<Instruction>();
-        var body = new CompoundStatement(null, statements);
-        // var optimized = body.optimize();
-        if (body instanceof CompoundStatement) body = (CompoundStatement)body;
-        else body = new CompoundStatement(null, new Statement[] { body });
 
-        subscope.define("this");
+        target.scope.define("this");
-        subscope.define("arguments");
+        target.scope.define("arguments");
-
-        body.declare(target);
 
         try {
-            body.compile(res, subscope);
+            stm.compile(target, true);
-            FunctionStatement.checkBreakAndCont(res, 0);
+            FunctionStatement.checkBreakAndCont(target, 0);
         }
         catch (SyntaxException e) {
-            res.clear();
+            target = new CompileResult(new LocalScopeRecord());
-            res.add(Instruction.throwSyntax(e));
+
+            target.scope.define("this");
+            target.scope.define("arguments");
+
+            target.add(Instruction.throwSyntax(e)).setLocation(stm.loc());
         }
 
-        if (res.size() != 0 && res.get(res.size() - 1).type == Type.DISCARD) {
+        target.add(Instruction.ret()).setLocation(stm.loc());
-            res.set(res.size() - 1, Instruction.ret());
-        }
-        else res.add(Instruction.ret());
 
-        return new CodeFunction(environment, "", subscope.localsCount(), 0, new ValueVariable[0], res.toArray(Instruction[]::new));
+        return target;
     }
-    public static CodeFunction compile(Environment environment, String filename, String raw) {
+    public static CompileResult compile(Filename filename, String raw) {
-        try {
+        return compile(parse(filename, raw));
-            return compile(environment, parse(filename, raw));
-        }
-        catch (SyntaxException e) {
-            return new CodeFunction(environment, null, 2, 0, new ValueVariable[0], new Instruction[] { Instruction.throwSyntax(e) });
-        }
     }
 }

src/java/me/topchetoeu/jscript/compilation/parsing/RawToken.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 public class RawToken {
     public final String value;

src/java/me/topchetoeu/jscript/compilation/parsing/TestRes.java

@@ -1,7 +1,7 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Location;
-import me.topchetoeu.jscript.parsing.ParseRes.State;
+import me.topchetoeu.jscript.compilation.parsing.ParseRes.State;
 
 public class TestRes {
     public final State state;

src/java/me/topchetoeu/jscript/compilation/parsing/Token.java

@@ -1,21 +1,24 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 public class Token {
     public final Object value;
+    public final String rawValue;
     public final boolean isString;
     public final boolean isRegex;
     public final int line;
     public final int start;
 
-    private Token(int line, int start, Object value, boolean isString, boolean isRegex) {
+    private Token(int line, int start, Object value, String rawValue, boolean isString, boolean isRegex) {
         this.value = value;
+        this.rawValue = rawValue;
         this.line = line;
         this.start = start;
         this.isString = isString;
         this.isRegex = isRegex;
     }
-    private Token(int line, int start, Object value) {
+    private Token(int line, int start, Object value, String rawValue) {
         this.value = value;
+        this.rawValue = rawValue;
         this.line = line;
         this.start = start;
         this.isString = false;
@@ -37,19 +40,19 @@ public class Token {
     public String identifier() { return (String)value; }
     public Operator operator() { return (Operator)value; }
 
-    public static Token regex(int line, int start, String val) {
+    public static Token regex(int line, int start, String val, String rawValue) {
-        return new Token(line, start, val, false, true);
+        return new Token(line, start, val, rawValue, false, true);
     }
-    public static Token string(int line, int start, String val) {
+    public static Token string(int line, int start, String val, String rawValue) {
-        return new Token(line, start, val, true, false);
+        return new Token(line, start, val, rawValue, true, false);
     }
-    public static Token number(int line, int start, double val) {
+    public static Token number(int line, int start, double val, String rawValue) {
-        return new Token(line, start, val);
+        return new Token(line, start, val, rawValue);
     }
     public static Token identifier(int line, int start, String val) {
-        return new Token(line, start, val);
+        return new Token(line, start, val, val);
     }
     public static Token operator(int line, int start, Operator val) {
-        return new Token(line, start, val);
+        return new Token(line, start, val, val.readable);
     }
 }

src/java/me/topchetoeu/jscript/compilation/parsing/TokenType.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.parsing;
+package me.topchetoeu.jscript.compilation.parsing;
 
 enum TokenType {
     REGEX,

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

@@ -0,0 +1,40 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ArrayStatement extends Statement {
+    public final Statement[] statements;
+
+    @Override public boolean pure() {
+        for (var stm : statements) {
+            if (!stm.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.loadArr(statements.length));
+
+        for (var i = 0; i < statements.length; i++) {
+            var el = statements[i];
+            if (el != null) {
+                target.add(Instruction.dup());
+                target.add(Instruction.pushValue(i));
+                el.compile(target, true);
+                target.add(Instruction.storeMember());
+            }
+        }
+
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public ArrayStatement(Location loc, Statement[] statements) {
+        super(loc);
+        this.statements = statements;
+    }
+}

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

@@ -0,0 +1,43 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class CallStatement extends Statement {
+    public final Statement func;
+    public final Statement[] args;
+    public final boolean isNew;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute, BreakpointType type) {
+        if (isNew) func.compile(target, true);
+        else if (func instanceof IndexStatement) {
+            ((IndexStatement)func).compile(target, true, true);
+        }
+        else {
+            target.add(Instruction.pushUndefined());
+            func.compile(target, true);
+        }
+
+        for (var arg : args) arg.compile(target, true);
+
+        if (isNew) target.add(Instruction.callNew(args.length)).setLocationAndDebug(loc(), type);
+        else target.add(Instruction.call(args.length)).setLocationAndDebug(loc(), type);
+
+        if (!pollute) target.add(Instruction.discard());
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, BreakpointType.STEP_IN);
+    }
+
+    public CallStatement(Location loc, boolean isNew, Statement func, Statement ...args) {
+        super(loc);
+        this.isNew = isNew;
+        this.func = func;
+        this.args = args;
+    }
+}

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

@@ -1,13 +1,11 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
+import me.topchetoeu.jscript.common.Instruction;
-
+import me.topchetoeu.jscript.common.Location;
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Operation;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
-import me.topchetoeu.jscript.compilation.Instruction;
+import me.topchetoeu.jscript.compilation.CompileResult;
 import me.topchetoeu.jscript.compilation.Statement;
-import me.topchetoeu.jscript.engine.Operation;
-import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class ChangeStatement extends Statement {
     public final AssignableStatement value;
@@ -15,11 +13,13 @@ public class ChangeStatement extends Statement {
     public final boolean postfix;
 
     @Override
-    public boolean pollutesStack() { return true; }
+    public void compile(CompileResult target, boolean pollute) {
-
+        value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, true);
-    @Override
+        if (!pollute) target.add(Instruction.discard());
-    public void compile(List<Instruction> target, ScopeRecord scope) {
+        else if (postfix) {
-        value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, scope, postfix);
+            target.add(Instruction.pushValue(addAmount));
+            target.add(Instruction.operation(Operation.SUBTRACT));
+        }
     }
 
     public ChangeStatement(Location loc, AssignableStatement value, double addAmount, boolean postfix) {

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

@@ -0,0 +1,47 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ConstantStatement extends Statement {
+    public final Object value;
+    public final boolean isNull;
+
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (pollute) {
+            if (isNull) target.add(Instruction.pushNull());
+            else if (value instanceof Double) target.add(Instruction.pushValue((Double)value));
+            else if (value instanceof String) target.add(Instruction.pushValue((String)value));
+            else if (value instanceof Boolean) target.add(Instruction.pushValue((Boolean)value));
+            else target.add(Instruction.pushUndefined());
+        }
+    }
+
+    private ConstantStatement(Location loc, Object val, boolean isNull) {
+        super(loc);
+        this.value = val;
+        this.isNull = isNull;
+    }
+
+    public ConstantStatement(Location loc, boolean val) {
+        this(loc, val, false);
+    }
+    public ConstantStatement(Location loc, String val) {
+        this(loc, val, false);
+    }
+    public ConstantStatement(Location loc, double val) {
+        this(loc, val, false);
+    }
+
+    public static ConstantStatement ofUndefined(Location loc) {
+        return new ConstantStatement(loc, null, false);
+    }
+    public static ConstantStatement ofNull(Location loc) {
+        return new ConstantStatement(loc, null, true);
+    }
+}

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

@@ -0,0 +1,23 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class DiscardStatement extends Statement {
+    public final Statement value;
+
+    @Override public boolean pure() { return value.pure(); }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        value.compile(target, false);
+        if (pollute) target.add(Instruction.pushUndefined());
+    }
+
+    public DiscardStatement(Location loc, Statement val) {
+        super(loc);
+        this.value = val;
+    }
+}

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

@@ -0,0 +1,127 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.common.Instruction.Type;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.CompoundStatement;
+import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.core.exceptions.SyntaxException;
+
+public class FunctionStatement extends Statement {
+    public final CompoundStatement body;
+    public final String varName;
+    public final String[] args;
+    public final boolean statement;
+    public final Location end;
+
+    @Override public boolean pure() { return varName == null && statement; }
+
+    @Override
+    public void declare(CompileResult target) {
+        if (varName != null && statement) target.scope.define(varName);
+    }
+
+    public static void checkBreakAndCont(CompileResult 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") ) {
+                    throw new SyntaxException(target.map.toLocation(i), "Break was placed outside a loop.");
+                }
+                if (target.get(i).is(0, "cont")) {
+                    throw new SyntaxException(target.map.toLocation(i), "Continue was placed outside a loop.");
+                }
+            }
+        }
+    }
+
+    private CompileResult compileBody(CompileResult target, boolean pollute, BreakpointType bp) {
+        for (var i = 0; i < args.length; i++) {
+            for (var j = 0; j < i; j++) {
+                if (args[i].equals(args[j])) {
+                    throw new SyntaxException(loc(), "Duplicate parameter '" + args[i] + "'.");
+                }
+            }
+        }
+
+        var subtarget = new CompileResult(target.scope.child());
+
+        subtarget.scope.define("this");
+        var argsVar = subtarget.scope.define("arguments");
+
+        if (args.length > 0) {
+            for (var i = 0; i < args.length; i++) {
+                subtarget.add(Instruction.loadVar(argsVar));
+                subtarget.add(Instruction.pushValue(i));
+                subtarget.add(Instruction.loadMember());
+                subtarget.add(Instruction.storeVar(subtarget.scope.define(args[i])));
+            }
+        }
+
+        if (!statement && this.varName != null) {
+            subtarget.add(Instruction.storeSelfFunc((int)subtarget.scope.define(this.varName))).setLocationAndDebug(loc(), bp);
+        }
+
+        body.declare(subtarget);
+        body.compile(subtarget, false);
+        subtarget.length = args.length;
+        subtarget.add(Instruction.ret()).setLocation(end);
+        checkBreakAndCont(subtarget, 0);
+
+        if (pollute) target.add(Instruction.loadFunc(target.children.size(), subtarget.scope.getCaptures()));
+        return target.addChild(subtarget);
+    }
+
+    public void compile(CompileResult target, boolean pollute, String name, BreakpointType bp) {
+        if (this.varName != null) name = this.varName;
+
+        var hasVar = this.varName != null && statement;
+        var hasName = name != null;
+
+        compileBody(target, pollute || hasVar || hasName, bp);
+
+        if (hasName) {
+            if (pollute || hasVar) target.add(Instruction.dup());
+            target.add(Instruction.pushValue("name"));
+            target.add(Instruction.pushValue(name));
+            target.add(Instruction.storeMember());
+        }
+
+        if (hasVar) {
+            var key = target.scope.getKey(this.varName);
+
+            if (key instanceof String) target.add(Instruction.makeVar((String)key));
+            target.add(Instruction.storeVar(target.scope.getKey(this.varName), false));
+        }
+    }
+    public void compile(CompileResult target, boolean pollute, String name) {
+        compile(target, pollute, name, BreakpointType.NONE);
+    }
+    @Override public void compile(CompileResult target, boolean pollute, BreakpointType bp) {
+        compile(target, pollute, (String)null, bp);
+    }
+    @Override public void compile(CompileResult target, boolean pollute) {
+        compile(target, pollute, (String)null, BreakpointType.NONE);
+    }
+
+    public FunctionStatement(Location loc, Location end, String varName, String[] args, boolean statement, CompoundStatement body) {
+        super(loc);
+
+        this.end = end;
+        this.varName = varName;
+        this.statement = statement;
+
+        this.args = args;
+        this.body = body;
+    }
+
+    public static void compileWithName(Statement stm, CompileResult target, boolean pollute, String name) {
+        if (stm instanceof FunctionStatement) ((FunctionStatement)stm).compile(target, pollute, name);
+        else stm.compile(target, pollute);
+    }
+    public static void compileWithName(Statement stm, CompileResult target, boolean pollute, String name, BreakpointType bp) {
+        if (stm instanceof FunctionStatement) ((FunctionStatement)stm).compile(target, pollute, name, bp);
+        else stm.compile(target, pollute, bp);
+    }
+}

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

@@ -0,0 +1,19 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class GlobalThisStatement extends Statement {
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (pollute) target.add(Instruction.loadGlob());
+    }
+
+    public GlobalThisStatement(Location loc) {
+        super(loc);
+    }
+}

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

@@ -0,0 +1,45 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class IndexAssignStatement extends Statement {
+    public final Statement object;
+    public final Statement index;
+    public final Statement value;
+    public final Operation operation;
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (operation != null) {
+            object.compile(target, true);
+            index.compile(target, true);
+            target.add(Instruction.dup(2));
+
+            target.add(Instruction.loadMember());
+            value.compile(target, true);
+            target.add(Instruction.operation(operation));
+
+            target.add(Instruction.storeMember(pollute)).setLocationAndDebug(loc(), BreakpointType.STEP_IN);
+        }
+        else {
+            object.compile(target, true);
+            index.compile(target, true);
+            value.compile(target, true);
+
+            target.add(Instruction.storeMember(pollute)).setLocationAndDebug(loc(), BreakpointType.STEP_IN);;
+        }
+    }
+
+    public IndexAssignStatement(Location loc, Statement object, Statement index, Statement value, Operation operation) {
+        super(loc);
+        this.object = object;
+        this.index = index;
+        this.value = value;
+        this.operation = operation;
+    }
+}

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

@@ -0,0 +1,37 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.common.Instruction.BreakpointType;
+import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class IndexStatement extends AssignableStatement {
+    public final Statement object;
+    public final Statement index;
+
+    @Override
+    public Statement toAssign(Statement val, Operation operation) {
+        return new IndexAssignStatement(loc(), object, index, val, operation);
+    }
+    public void compile(CompileResult target, boolean dupObj, boolean pollute) {
+        object.compile(target, true);
+        if (dupObj) target.add(Instruction.dup());
+
+        index.compile(target, true);
+        target.add(Instruction.loadMember()).setLocationAndDebug(loc(), BreakpointType.STEP_IN);
+        if (!pollute) target.add(Instruction.discard());
+    }
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        compile(target, false, pollute);
+    }
+
+    public IndexStatement(Location loc, Statement object, Statement index) {
+        super(loc);
+        this.object = object;
+        this.index = index;
+    }
+}

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

@@ -0,0 +1,28 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class LazyAndStatement extends Statement {
+    public final Statement first, second;
+
+    @Override public boolean pure() { return first.pure() && second.pure(); }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        first.compile(target, true);
+        if (pollute) target.add(Instruction.dup());
+        int start = target.temp();
+        if (pollute) target.add(Instruction.discard());
+        second.compile(target, pollute);
+        target.set(start, Instruction.jmpIfNot(target.size() - start));
+    }
+
+    public LazyAndStatement(Location loc, Statement first, Statement second) {
+        super(loc);
+        this.first = first;
+        this.second = second;
+    }
+}

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

@@ -0,0 +1,28 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class LazyOrStatement extends Statement {
+    public final Statement first, second;
+
+    @Override public boolean pure() { return first.pure() && second.pure(); }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        first.compile(target, true);
+        if (pollute) target.add(Instruction.dup());
+        int start = target.temp();
+        if (pollute) target.add(Instruction.discard());
+        second.compile(target, pollute);
+        target.set(start, Instruction.jmpIf(target.size() - start));
+    }
+
+    public LazyOrStatement(Location loc, Statement first, Statement second) {
+        super(loc);
+        this.first = first;
+        this.second = second;
+    }
+}

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

@@ -0,0 +1,61 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import java.util.ArrayList;
+import java.util.Map;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class ObjectStatement extends Statement {
+    public final Map<String, Statement> map;
+    public final Map<String, FunctionStatement> getters;
+    public final Map<String, FunctionStatement> setters;
+
+    @Override public boolean pure() {
+        for (var el : map.values()) {
+            if (!el.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.loadObj());
+
+        for (var el : map.entrySet()) {
+            target.add(Instruction.dup());
+            target.add(Instruction.pushValue(el.getKey()));
+            var val = el.getValue();
+            FunctionStatement.compileWithName(val, target, true, el.getKey().toString());
+            target.add(Instruction.storeMember());
+        }
+
+        var keys = new ArrayList<Object>();
+        keys.addAll(getters.keySet());
+        keys.addAll(setters.keySet());
+
+        for (var key : keys) {
+            target.add(Instruction.pushValue((String)key));
+
+            if (getters.containsKey(key)) getters.get(key).compile(target, true);
+            else target.add(Instruction.pushUndefined());
+
+            if (setters.containsKey(key)) setters.get(key).compile(target, true);
+            else target.add(Instruction.pushUndefined());
+
+            target.add(Instruction.defProp());
+        }
+
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public ObjectStatement(Location loc, Map<String, Statement> map, Map<String, FunctionStatement> getters, Map<String, FunctionStatement> setters) {
+        super(loc);
+        this.map = map;
+        this.getters = getters;
+        this.setters = setters;
+    }
+}

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

@@ -0,0 +1,36 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class OperationStatement extends Statement {
+    public final Statement[] args;
+    public final Operation operation;
+
+    @Override public boolean pure() {
+        for (var el : args) {
+            if (!el.pure()) return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        for (var arg : args) {
+            arg.compile(target, true);
+        }
+
+        if (pollute) target.add(Instruction.operation(operation));
+        else target.add(Instruction.discard());
+    }
+
+    public OperationStatement(Location loc, Operation operation, Statement ...args) {
+        super(loc);
+        this.operation = operation;
+        this.args = args;
+    }
+}

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

@@ -0,0 +1,25 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class RegexStatement extends Statement {
+    public final String pattern, flags;
+
+    // Not really pure, since a function is called, but can be ignored.
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        target.add(Instruction.loadRegex(pattern, flags));
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public RegexStatement(Location loc, String pattern, String flags) {
+        super(loc);
+        this.pattern = pattern;
+        this.flags = flags;
+    }
+}

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

@@ -0,0 +1,32 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class TypeofStatement extends Statement {
+    public final Statement value;
+
+    // Not really pure, since a variable from the global scope could be accessed,
+    // which could lead to code execution, that would get omitted
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (value instanceof VariableStatement) {
+            var i = target.scope.getKey(((VariableStatement)value).name);
+            if (i instanceof String) {
+                target.add(Instruction.typeof((String)i));
+                return;
+            }
+        }
+        value.compile(target, pollute);
+        target.add(Instruction.typeof());
+    }
+
+    public TypeofStatement(Location loc, Statement value) {
+        super(loc);
+        this.value = value;
+    }
+}

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

@@ -0,0 +1,37 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class VariableAssignStatement extends Statement {
+    public final String name;
+    public final Statement value;
+    public final Operation operation;
+
+    @Override public boolean pure() { return false; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var i = target.scope.getKey(name);
+        if (operation != null) {
+            target.add(Instruction.loadVar(i));
+            FunctionStatement.compileWithName(value, target, true, name);
+            target.add(Instruction.operation(operation));
+            target.add(Instruction.storeVar(i, pollute));
+        }
+        else {
+            FunctionStatement.compileWithName(value, target, true, name);
+            target.add(Instruction.storeVar(i, pollute));
+        }
+    }
+
+    public VariableAssignStatement(Location loc, String name, Statement val, Operation operation) {
+        super(loc);
+        this.name = name;
+        this.value = val;
+        this.operation = operation;
+    }
+}

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

@@ -0,0 +1,22 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class VariableIndexStatement extends Statement {
+    public final int index;
+
+    @Override public boolean pure() { return true; }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        if (pollute) target.add(Instruction.loadVar(index));
+    }
+
+    public VariableIndexStatement(Location loc, int i) {
+        super(loc);
+        this.index = i;
+    }
+}

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

@@ -0,0 +1,31 @@
+package me.topchetoeu.jscript.compilation.values;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileResult;
+import me.topchetoeu.jscript.compilation.Statement;
+
+public class VariableStatement extends AssignableStatement {
+    public final String name;
+
+    @Override public boolean pure() { return false; }
+
+    @Override
+    public Statement toAssign(Statement val, Operation operation) {
+        return new VariableAssignStatement(loc(), name, val, operation);
+    }
+
+    @Override
+    public void compile(CompileResult target, boolean pollute) {
+        var i = target.scope.getKey(name);
+        target.add(Instruction.loadVar(i));
+        if (!pollute) target.add(Instruction.discard());
+    }
+
+    public VariableStatement(Location loc, String name) {
+        super(loc);
+        this.name = name;
+    }
+}

src/java/me/topchetoeu/jscript/core/Compiler.java

@@ -0,0 +1,23 @@
+package me.topchetoeu.jscript.core;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.FunctionBody;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.core.scope.ValueVariable;
+import me.topchetoeu.jscript.core.values.CodeFunction;
+
+public interface Compiler {
+    public Key<Compiler> KEY = new Key<>();
+
+    public FunctionBody compile(Filename filename, String source);
+
+    public static Compiler get(Extensions ext) {
+        return ext.get(KEY, (filename, src) -> {
+            throw EngineException.ofError("No compiler attached to engine.");
+        });
+    }
+
+    public static CodeFunction compile(Environment env, Filename filename, String raw) {
+        return new CodeFunction(env, filename.toString(), Compiler.get(env).compile(filename, raw), new ValueVariable[0]);
+    }
+}

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

@@ -0,0 +1,109 @@
+package me.topchetoeu.jscript.core;
+
+import java.util.Iterator;
+import java.util.List;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.core.debug.DebugContext;
+import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.core.scope.ValueVariable;
+
+public class Context implements Extensions {
+    public static final Context NULL = new Context();
+
+    public final Context parent;
+    public final Environment environment;
+    public final Frame frame;
+    // public final Engine engine;
+    public final int stackSize;
+
+    @Override public <T> void add(Key<T> key, T obj) {
+        if (environment != null) environment.add(key, obj);
+        // else if (engine != null) engine.add(key, obj);
+    }
+    @Override public <T> T get(Key<T> key) {
+        if (environment != null && environment.has(key)) return environment.get(key);
+        // else if (engine != null && engine.has(key)) return engine.get(key);
+        return null;
+    }
+    @Override public boolean has(Key<?> key) {
+        return
+            environment != null && environment.has(key);
+            // engine != null && engine.has(key);
+    }
+    @Override public boolean remove(Key<?> key) {
+        var res = false;
+
+        if (environment != null) res |= environment.remove(key);
+        // else if (engine != null) res |= engine.remove(key);
+
+        return res;
+    }
+    @Override public Iterable<Key<?>> keys() {
+        if (environment == null) return List.of();
+        else return environment.keys();
+
+        // if (engine == null && environment == null) return List.of();
+        // if (engine == null) return environment.keys();
+        // if (environment == null) return engine.keys();
+
+        // return () -> Stream.concat(
+        //     StreamSupport.stream(engine.keys().spliterator(), false),
+        //     StreamSupport.stream(environment.keys().spliterator(), false)
+        // ).distinct().iterator();
+    }
+
+    public FunctionValue compile(Filename filename, String raw) {
+        DebugContext.get(this).onSource(filename, raw);
+        var result = new CodeFunction(environment, filename.toString(), Compiler.get(this).compile(filename, raw), new ValueVariable[0]);
+        return result;
+    }
+
+    public Context pushFrame(Frame frame) {
+        var res = new Context(this, frame.function.environment, frame, stackSize + 1);
+        return res;
+    }
+
+    public Iterable<Frame> frames() {
+        var self = this;
+        return () -> new Iterator<Frame>() {
+            private Context curr = self;
+
+            private void update() {
+                while (curr != null && curr.frame == null) curr = curr.parent;
+            }
+
+            @Override public boolean hasNext() {
+                update();
+                return curr != null;
+            }
+            @Override public Frame next() {
+                update();
+                var res = curr.frame;
+                curr = curr.parent;
+                return res;
+            }
+        };
+    }
+
+
+    private Context(Context parent, Environment environment, Frame frame, int stackSize) {
+        this.parent = parent;
+        this.environment = environment;
+        this.frame = frame;
+        this.stackSize = stackSize;
+
+        if (hasNotNull(Environment.MAX_STACK_COUNT) && stackSize > (int)get(Environment.MAX_STACK_COUNT)) {
+            throw EngineException.ofRange("Stack overflow!");
+        }
+    }
+
+    public Context() {
+        this(null, null, null, 0);
+    }
+    public Context(Environment env) {
+        this(null, env, null, 0);
+    }
+}

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

@@ -0,0 +1,95 @@
+package me.topchetoeu.jscript.core;
+
+import java.util.concurrent.PriorityBlockingQueue;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.ResultRunnable;
+import me.topchetoeu.jscript.common.events.DataNotifier;
+import me.topchetoeu.jscript.core.exceptions.InterruptException;
+import me.topchetoeu.jscript.core.values.FunctionValue;
+
+public class Engine implements EventLoop {
+    private static class Task<T> implements Comparable<Task<?>> {
+        public final ResultRunnable<?> runnable;
+        public final DataNotifier<T> notifier = new DataNotifier<>();
+        public final boolean micro;
+
+        public Task(ResultRunnable<T> runnable, boolean micro) {
+            this.runnable = runnable;
+            this.micro = micro;
+        }
+
+        @Override
+        public int compareTo(Task<?> other) {
+            return Integer.compare(this.micro ? 0 : 1, other.micro ? 0 : 1);
+        }
+    }
+
+    private PriorityBlockingQueue<Task<?>> tasks = new PriorityBlockingQueue<>();
+    private Thread thread;
+
+    @Override
+    public <T> DataNotifier<T> pushMsg(ResultRunnable<T> runnable, boolean micro) {
+        var msg = new Task<T>(runnable, micro);
+        tasks.add(msg);
+        return msg.notifier;
+    }
+
+    @SuppressWarnings("unchecked")
+    public void run(boolean untilEmpty) {
+        while (!untilEmpty || !tasks.isEmpty()) {
+            try {
+                var task = tasks.take();
+
+                try {
+                    ((Task<Object>)task).notifier.next(task.runnable.run());
+                }
+                catch (RuntimeException e) {
+                    if (e instanceof InterruptException) throw e;
+                    task.notifier.error(e);
+                }
+            }
+            catch (InterruptedException | InterruptException e) {
+                for (var msg : tasks) msg.notifier.error(new InterruptException(e));
+                break;
+            }
+        }
+    }
+
+    public Thread thread() {
+        return thread;
+    }
+    public Thread start() {
+        if (thread == null) {
+            thread = new Thread(() -> run(false), "Event loop #" + hashCode());
+            thread.start();
+        }
+        return thread;
+    }
+    public void stop() {
+        if (thread != null) thread.interrupt();
+        thread = null;
+    }
+
+    public boolean inLoopThread() {
+        return Thread.currentThread() == thread;
+    }
+    public boolean isRunning() {
+        return this.thread != null;
+    }
+
+    public DataNotifier<Object> pushMsg(boolean micro, Environment env, FunctionValue func, Object thisArg, Object ...args) {
+        return pushMsg(() -> {
+            return func.call(new Context(env), thisArg, args);
+        }, micro);
+    }
+    public DataNotifier<Object> pushMsg(boolean micro, Environment env, Filename filename, String raw, Object thisArg, Object ...args) {
+        return pushMsg(() -> {
+            var ctx = new Context(env);
+            return ctx.compile(filename, raw).call(new Context(env), thisArg, args);
+        }, micro);
+    }
+
+    public Engine() {
+    }
+}

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

@@ -0,0 +1,92 @@
+package me.topchetoeu.jscript.core;
+
+import java.util.HashMap;
+
+import me.topchetoeu.jscript.core.scope.GlobalScope;
+import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.utils.interop.NativeWrapperProvider;
+
+@SuppressWarnings("unchecked")
+public class Environment implements Extensions {
+    public static final Key<Compiler> COMPILE_FUNC = new Key<>();
+
+    public static final Key<FunctionValue> REGEX_CONSTR = new Key<>();
+    public static final Key<Integer> MAX_STACK_COUNT = new Key<>();
+    public static final Key<Boolean> HIDE_STACK = new Key<>();
+
+    public static final Key<ObjectValue> OBJECT_PROTO = new Key<>();
+    public static final Key<ObjectValue> FUNCTION_PROTO = new Key<>();
+    public static final Key<ObjectValue> ARRAY_PROTO = new Key<>();
+    public static final Key<ObjectValue> BOOL_PROTO = new Key<>();
+    public static final Key<ObjectValue> NUMBER_PROTO = new Key<>();
+    public static final Key<ObjectValue> STRING_PROTO = new Key<>();
+    public static final Key<ObjectValue> SYMBOL_PROTO = new Key<>();
+    public static final Key<ObjectValue> ERROR_PROTO = new Key<>();
+    public static final Key<ObjectValue> SYNTAX_ERR_PROTO = new Key<>();
+    public static final Key<ObjectValue> TYPE_ERR_PROTO = new Key<>();
+    public static final Key<ObjectValue> RANGE_ERR_PROTO = new Key<>();
+
+    private HashMap<Key<?>, Object> data = new HashMap<>();
+
+    public GlobalScope global;
+    public WrapperProvider wrappers;
+
+    @Override public <T> void add(Key<T> key, T obj) {
+        data.put(key, obj);
+    }
+    @Override public <T> T get(Key<T> key) {
+        return (T)data.get(key);
+    }
+    @Override public boolean remove(Key<?> key) {
+        if (data.containsKey(key)) {
+            data.remove(key);
+            return true;
+        }
+        return false;
+    }
+    @Override public boolean has(Key<?> key) {
+        return data.containsKey(key);
+    }
+    @Override public Iterable<Key<?>> keys() {
+        return data.keySet();
+    }
+
+    public static FunctionValue regexConstructor(Extensions ext) {
+        return ext.init(REGEX_CONSTR, new NativeFunction("RegExp", args -> {
+            throw EngineException.ofError("Regular expressions not supported.").setCtx(args.ctx);
+        }));
+    }
+
+    public Environment copy() {
+        var res = new Environment(null, global);
+
+        res.wrappers = wrappers.fork(res);
+        res.global = global;
+        res.data.putAll(data);
+
+        return res;
+    }
+    public Environment child() {
+        var res = copy();
+        res.global = res.global.globalChild();
+        return res;
+    }
+
+    public Context context() {
+        return new Context(this);
+    }
+
+    public Environment(WrapperProvider nativeConverter, GlobalScope global) {
+        if (nativeConverter == null) nativeConverter = new NativeWrapperProvider(this);
+        if (global == null) global = new GlobalScope();
+
+        this.wrappers = nativeConverter;
+        this.global = global;
+    }
+    public Environment() {
+        this(null, null);
+    }
+}

src/java/me/topchetoeu/jscript/core/EventLoop.java

@@ -0,0 +1,23 @@
+package me.topchetoeu.jscript.core;
+
+import me.topchetoeu.jscript.common.ResultRunnable;
+import me.topchetoeu.jscript.common.events.DataNotifier;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+
+public interface EventLoop {
+    public static final Key<EventLoop> KEY = new Key<>();
+
+    public static EventLoop get(Extensions ext) {
+        if (ext.hasNotNull(KEY)) return ext.get(KEY);
+        else return new EventLoop() {
+            @Override public <T> DataNotifier<T> pushMsg(ResultRunnable<T> runnable, boolean micro) {
+                throw EngineException.ofError("No event loop attached to environment.");
+            }
+        };
+    }
+
+    public <T> DataNotifier<T> pushMsg(ResultRunnable<T> runnable, boolean micro);
+    public default DataNotifier<Void> pushMsg(Runnable runnable, boolean micro) {
+        return pushMsg(() -> { runnable.run(); return null; }, micro);
+    }
+}

src/java/me/topchetoeu/jscript/core/Extensions.java

@@ -0,0 +1,38 @@
+package me.topchetoeu.jscript.core;
+
+public interface Extensions {
+    <T> T get(Key<T> key);
+    <T> void add(Key<T> key, T obj);
+    Iterable<Key<?>> keys();
+
+    boolean has(Key<?> key);
+    boolean remove(Key<?> key);
+
+    default void add(Key<Void> key) {
+        add(key, null);
+    }
+
+    default boolean hasNotNull(Key<?> key) {
+        return has(key) && get(key) != null;
+    }
+
+    default <T> T get(Key<T> key, T defaultVal) {
+        if (has(key)) return get(key);
+        else return defaultVal;
+    }
+
+    default <T> T init(Key<T> key, T val) {
+        if (has(key)) return get(key);
+        else {
+            add(key, val);
+            return val;
+        }
+    }
+    @SuppressWarnings("unchecked")
+    default void addAll(Extensions source) {
+        if (source == null) return;
+        for (var key : source.keys()) {
+            add((Key<Object>)key, (Object)source.get(key));
+        }
+    }
+}

src/java/me/topchetoeu/jscript/core/Frame.java

@@ -0,0 +1,329 @@
+package me.topchetoeu.jscript.core;
+
+import java.util.List;
+import java.util.Stack;
+
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.core.debug.DebugContext;
+import me.topchetoeu.jscript.core.scope.LocalScope;
+import me.topchetoeu.jscript.core.scope.ValueVariable;
+import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.core.values.ScopeValue;
+import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+import me.topchetoeu.jscript.core.exceptions.InterruptException;
+
+public class Frame {
+    public static enum TryState {
+        TRY,
+        CATCH,
+        FINALLY,
+    }
+
+    public static class TryCtx {
+        public final int start, end, catchStart, finallyStart;
+        public final int restoreStackPtr;
+        public final TryState state;
+        public final EngineException error;
+        public final PendingResult result;
+
+        public boolean hasCatch() { return catchStart >= 0; }
+        public boolean hasFinally() { return finallyStart >= 0; }
+
+        public boolean inBounds(int ptr) {
+            return ptr >= start && ptr < end;
+        }
+
+        public void setCause(EngineException target) {
+            if (error != null) target.setCause(error);
+        }
+        public TryCtx _catch(EngineException e) {
+            return new TryCtx(TryState.CATCH, e, result, restoreStackPtr, start, end, -1, finallyStart);
+        }
+        public TryCtx _finally(PendingResult res) {
+            return new TryCtx(TryState.FINALLY, error, res, restoreStackPtr, start, end, -1, -1);
+        }
+
+        public TryCtx(TryState state, EngineException err, PendingResult res, int stackPtr, int start, int end, int catchStart, int finallyStart) {
+            this.catchStart = catchStart;
+            this.finallyStart = finallyStart;
+            this.restoreStackPtr = stackPtr;
+            this.result = res == null ? PendingResult.ofNone() : res;
+            this.state = state;
+            this.start = start;
+            this.end = end;
+            this.error = err;
+        }
+    }
+
+    private static class PendingResult {
+        public final boolean isReturn, isJump, isThrow;
+        public final Object value;
+        public final EngineException error;
+        public final int ptr;
+        public final Instruction instruction;
+
+        private PendingResult(Instruction instr, boolean isReturn, boolean isJump, boolean isThrow, Object value, EngineException error, int ptr) {
+            this.instruction = instr;
+            this.isReturn = isReturn;
+            this.isJump = isJump;
+            this.isThrow = isThrow;
+            this.value = value;
+            this.error = error;
+            this.ptr = ptr;
+        }
+
+        public static PendingResult ofNone() {
+            return new PendingResult(null, false, false, false, null, null, 0);
+        }
+        public static PendingResult ofReturn(Object value, Instruction instr) {
+            return new PendingResult(instr, true, false, false, value, null, 0);
+        }
+        public static PendingResult ofThrow(EngineException error, Instruction instr) {
+            return new PendingResult(instr, false, false, true, null, error, 0);
+        }
+        public static PendingResult ofJump(int codePtr, Instruction instr) {
+            return new PendingResult(instr, false, true, false, null, null, codePtr);
+        }
+    }
+
+    public final LocalScope scope;
+    public final Object thisArg;
+    public final Object[] args;
+    public final Stack<TryCtx> tryStack = new Stack<>();
+    public final CodeFunction function;
+    public final Context ctx;
+    public Object[] stack = new Object[32];
+    public int stackPtr = 0;
+    public int codePtr = 0;
+    public boolean jumpFlag = false, popTryFlag = false;
+
+    public void addTry(int start, int end, int catchStart, int finallyStart) {
+        var err = tryStack.empty() ? null : tryStack.peek().error;
+        var res = new TryCtx(TryState.TRY, err, null, stackPtr, start, end, catchStart, finallyStart);
+
+        tryStack.add(res);
+    }
+
+    public Object peek() {
+        return peek(0);
+    }
+    public Object peek(int offset) {
+        if (stackPtr <= offset) return null;
+        else return stack[stackPtr - 1 - offset];
+    }
+    public Object pop() {
+        if (stackPtr == 0) return null;
+        return stack[--stackPtr];
+    }
+    public Object[] take(int n) {
+        int srcI = stackPtr - n;
+        if (srcI < 0) srcI = 0;
+
+        int dstI = n + srcI - stackPtr;
+        int copyN = stackPtr - srcI;
+
+        Object[] res = new Object[n];
+        System.arraycopy(stack, srcI, res, dstI, copyN);
+        stackPtr -= copyN;
+
+        return res;
+    }
+    public void push(Object val) {
+        if (stack.length <= stackPtr) {
+            var newStack = new Object[stack.length * 2];
+            System.arraycopy(stack, 0, newStack, 0, stack.length);
+            stack = newStack;
+        }
+        stack[stackPtr++] = Values.normalize(ctx, val);
+    }
+
+    public Object next(Object value, Object returnValue, EngineException error) {
+        if (value != Values.NO_RETURN) push(value);
+
+        Instruction instr = null;
+        if (codePtr >= 0 && codePtr < function.body.instructions.length) instr = function.body.instructions[codePtr];
+
+        if (returnValue == Values.NO_RETURN && error == null) {
+            try {
+                if (Thread.currentThread().isInterrupted()) throw new InterruptException();
+
+                if (instr == null) returnValue = null;
+                else {
+                    DebugContext.get(ctx).onInstruction(ctx, this, instr, Values.NO_RETURN, null, false);
+
+                    try {
+                        this.jumpFlag = this.popTryFlag = false;
+                        returnValue = InstructionRunner.exec(ctx, instr, this);
+                    }
+                    catch (EngineException e) {
+                        error = e.add(ctx, function.name, DebugContext.get(ctx).getMapOrEmpty(function).toLocation(codePtr, true));
+                    }
+                }
+            }
+            catch (EngineException e) { error = e; }
+        }
+
+        while (!tryStack.empty()) {
+            var tryCtx = tryStack.peek();
+            TryCtx newCtx = null;
+
+            if (error != null) {
+                tryCtx.setCause(error);
+                if (tryCtx.hasCatch()) newCtx = tryCtx._catch(error);
+                else if (tryCtx.hasFinally()) newCtx = tryCtx._finally(PendingResult.ofThrow(error, instr));
+            }
+            else if (returnValue != Values.NO_RETURN) {
+                if (tryCtx.hasFinally()) newCtx = tryCtx._finally(PendingResult.ofReturn(returnValue, instr));
+            }
+            else if (jumpFlag && !tryCtx.inBounds(codePtr)) {
+                if (tryCtx.hasFinally()) newCtx = tryCtx._finally(PendingResult.ofJump(codePtr, instr));
+            }
+            else if (!this.popTryFlag) newCtx = tryCtx;
+
+            if (newCtx != null) {
+                if (newCtx != tryCtx) {
+                    switch (newCtx.state) {
+                        case CATCH:
+                            if (tryCtx.state != TryState.CATCH) scope.catchVars.add(new ValueVariable(false, error.value));
+                            codePtr = tryCtx.catchStart;
+                            stackPtr = tryCtx.restoreStackPtr;
+                            break;
+                        case FINALLY:
+                            if (tryCtx.state == TryState.CATCH) scope.catchVars.remove(scope.catchVars.size() - 1);
+                            codePtr = tryCtx.finallyStart;
+                            stackPtr = tryCtx.restoreStackPtr;
+                        default:
+                    }
+
+                    tryStack.pop();
+                    tryStack.push(newCtx);
+                }
+                error = null;
+                returnValue = Values.NO_RETURN;
+                break;
+            }
+            else {
+                popTryFlag = false;
+                if (tryCtx.state == TryState.CATCH) scope.catchVars.remove(scope.catchVars.size() - 1);
+
+                if (tryCtx.state != TryState.FINALLY && tryCtx.hasFinally()) {
+                    codePtr = tryCtx.finallyStart;
+                    stackPtr = tryCtx.restoreStackPtr;
+                    tryStack.pop();
+                    tryStack.push(tryCtx._finally(null));
+                    break;
+                }
+                else {
+                    tryStack.pop();
+                    codePtr = tryCtx.end;
+                    if (tryCtx.result.instruction != null) instr = tryCtx.result.instruction;
+                    if (!jumpFlag && returnValue == Values.NO_RETURN && error == null) {
+                        if (tryCtx.result.isJump) {
+                            codePtr = tryCtx.result.ptr;
+                            jumpFlag = true;
+                        }
+                        if (tryCtx.result.isReturn) returnValue = tryCtx.result.value;
+                        if (error == null && tryCtx.result.isThrow) {
+                            error = tryCtx.result.error;
+                        }
+                    }
+                    if (error != null) tryCtx.setCause(error);
+                    continue;
+                }
+            }
+        }
+
+        if (error != null) {
+            var caught = false;
+
+            for (var frame : ctx.frames()) {
+                for (var tryCtx : frame.tryStack) {
+                    if (tryCtx.state == TryState.TRY) caught = true;
+                }
+            }
+
+            DebugContext.get(ctx).onInstruction(ctx, this, instr, null, error, caught);
+            throw error;
+        }
+        if (returnValue != Values.NO_RETURN) {
+            DebugContext.get(ctx).onInstruction(ctx, this, instr, returnValue, null, false);
+            return returnValue;
+        }
+
+        return Values.NO_RETURN;
+    }
+
+    public void onPush() {
+        DebugContext.get(ctx).onFramePush(ctx, this);
+    }
+    public void onPop() {
+        DebugContext.get(ctx.parent).onFramePop(ctx.parent, this);
+    }
+
+    public ObjectValue getLocalScope() {
+        var names = new String[scope.locals.length];
+        var map = DebugContext.get(ctx).getMapOrEmpty(function);
+
+        for (int i = 0; i < scope.locals.length; i++) {
+            var name = "local_" + (i - 2);
+
+            if (i == 0) name = "this";
+            else if (i == 1) name = "arguments";
+            else if (i < map.localNames.length) name = map.localNames[i];
+
+            names[i] = name;
+        }
+
+        return new ScopeValue(scope.locals, names);
+    }
+    public ObjectValue getCaptureScope() {
+        var names = new String[scope.captures.length];
+        var map = DebugContext.get(ctx).getMapOrEmpty(function);
+
+        for (int i = 0; i < scope.captures.length; i++) {
+            var name = "capture_" + (i - 2);
+            if (i < map.captureNames.length) name = map.captureNames[i];
+            names[i] = name;
+        }
+
+        return new ScopeValue(scope.captures, names);
+    }
+    public ObjectValue getValStackScope() {
+        return new ObjectValue() {
+            @Override
+            protected Object getField(Context ctx, Object key) {
+                var i = (int)Values.toNumber(ctx, key);
+                if (i < 0 || i >= stackPtr) return null;
+                else return stack[i];
+            }
+            @Override
+            protected boolean hasField(Context ctx, Object key) {
+                return true;
+            }
+            @Override
+            public List<Object> keys(boolean includeNonEnumerable) {
+                var res = super.keys(includeNonEnumerable);
+                for (var i = 0; i < stackPtr; i++) res.add(i);
+                return res;
+            }
+        };
+    }
+
+    public Frame(Context ctx, Object thisArg, Object[] args, CodeFunction func) {
+        this.args = args.clone();
+        this.scope = new LocalScope(func.body.localsN, func.captures);
+        this.scope.get(0).set(null, thisArg);
+        var argsObj = new ArrayValue();
+        for (var i = 0; i < args.length; i++) {
+            argsObj.set(ctx, i, args[i]);
+        }
+        this.scope.get(1).value = argsObj;
+
+        this.thisArg = thisArg;
+        this.function = func;
+        this.ctx = ctx.pushFrame(this);
+    }
+}

src/java/me/topchetoeu/jscript/core/InstructionRunner.java

@@ -0,0 +1,329 @@
+package me.topchetoeu.jscript.core;
+
+import java.util.Collections;
+
+import me.topchetoeu.jscript.core.scope.ValueVariable;
+import me.topchetoeu.jscript.core.values.ArrayValue;
+import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.core.values.Symbol;
+import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Operation;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+
+public class InstructionRunner {
+    private static Object execReturn(Context ctx, Instruction instr, Frame frame) {
+        return frame.pop();
+    }
+    private static Object execThrow(Context ctx, Instruction instr, Frame frame) {
+        throw new EngineException(frame.pop());
+    }
+    private static Object execThrowSyntax(Context ctx, Instruction instr, Frame frame) {
+        throw EngineException.ofSyntax((String)instr.get(0));
+    }
+
+    private static Object execCall(Context ctx, Instruction instr, Frame frame) {
+        var callArgs = frame.take(instr.get(0));
+        var func = frame.pop();
+        var thisArg = frame.pop();
+
+        frame.push(Values.call(ctx, func, thisArg, callArgs));
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execCallNew(Context ctx, Instruction instr, Frame frame) {
+        var callArgs = frame.take(instr.get(0));
+        var funcObj = frame.pop();
+
+        frame.push(Values.callNew(ctx, funcObj, callArgs));
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+
+    private static Object execMakeVar(Context ctx, Instruction instr, Frame frame) {
+        var name = (String)instr.get(0);
+        ctx.environment.global.define(name);
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execDefProp(Context ctx, Instruction instr, Frame frame) {
+        var setter = frame.pop();
+        var getter = frame.pop();
+        var name = frame.pop();
+        var obj = frame.pop();
+
+        if (getter != null && !(getter instanceof FunctionValue)) throw EngineException.ofType("Getter must be a function or undefined.");
+        if (setter != null && !(setter instanceof FunctionValue)) throw EngineException.ofType("Setter must be a function or undefined.");
+        if (!(obj instanceof ObjectValue)) throw EngineException.ofType("Property apply target must be an object.");
+        ((ObjectValue)obj).defineProperty(ctx, name, (FunctionValue)getter, (FunctionValue)setter, false, false);
+
+        frame.push(obj);
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execKeys(Context ctx, Instruction instr, Frame frame) {
+        var val = frame.pop();
+
+        var members = Values.getMembers(ctx, val, false, false);
+        Collections.reverse(members);
+
+        frame.push(null);
+
+        for (var el : members) {
+            if (el instanceof Symbol) continue;
+            var obj = new ObjectValue();
+            obj.defineProperty(ctx, "value", el);
+            frame.push(obj);
+        }
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+
+    private static Object execTryStart(Context ctx, Instruction instr, Frame frame) {
+        int start = frame.codePtr + 1;
+        int catchStart = (int)instr.get(0);
+        int finallyStart = (int)instr.get(1);
+        if (finallyStart >= 0) finallyStart += start;
+        if (catchStart >= 0) catchStart += start;
+        int end = (int)instr.get(2) + start;
+        frame.addTry(start, end, catchStart, finallyStart);
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execTryEnd(Context ctx, Instruction instr, Frame frame) {
+        frame.popTryFlag = true;
+        return Values.NO_RETURN;
+    }
+
+    private static Object execDup(Context ctx, Instruction instr, Frame frame) {
+        int count = instr.get(0);
+
+        for (var i = 0; i < count; i++) {
+            frame.push(frame.peek(count - 1));
+        }
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadValue(Context ctx, Instruction instr, Frame frame) {
+        switch (instr.type) {
+            case PUSH_UNDEFINED: frame.push(null); break;
+            case PUSH_NULL: frame.push(Values.NULL); break;
+            default: frame.push(instr.get(0)); break;
+        }
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadVar(Context ctx, Instruction instr, Frame frame) {
+        var i = instr.get(0);
+
+        if (i instanceof String) frame.push(ctx.environment.global.get(ctx, (String)i));
+        else frame.push(frame.scope.get((int)i).get(ctx));
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadObj(Context ctx, Instruction instr, Frame frame) {
+        frame.push(new ObjectValue());
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadGlob(Context ctx, Instruction instr, Frame frame) {
+        frame.push(ctx.environment.global.obj);
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadArr(Context ctx, Instruction instr, Frame frame) {
+        var res = new ArrayValue();
+        res.setSize(instr.get(0));
+        frame.push(res);
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadFunc(Context ctx, Instruction instr, Frame frame) {
+        int id = instr.get(0);
+        var captures = new ValueVariable[instr.params.length - 1];
+
+        for (var i = 1; i < instr.params.length; i++) {
+            captures[i - 1] = frame.scope.get(instr.get(i));
+        }
+
+        var func = new CodeFunction(ctx.environment, "", frame.function.body.children[id], captures);
+
+        frame.push(func);
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadMember(Context ctx, Instruction instr, Frame frame) {
+        var key = frame.pop();
+        var obj = frame.pop();
+
+        try {
+            frame.push(Values.getMember(ctx, obj, key));
+        }
+        catch (IllegalArgumentException e) {
+            throw EngineException.ofType(e.getMessage());
+        }
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execLoadRegEx(Context ctx, Instruction instr, Frame frame) {
+        if (ctx.hasNotNull(Environment.REGEX_CONSTR)) {
+            frame.push(Values.callNew(ctx, ctx.get(Environment.REGEX_CONSTR), instr.get(0), instr.get(1)));
+        }
+        else {
+            throw EngineException.ofSyntax("Regex is not supported.");
+        }
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+
+    private static Object execDiscard(Context ctx, Instruction instr, Frame frame) {
+        frame.pop();
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execStoreMember(Context ctx, Instruction instr, Frame frame) {
+        var val = frame.pop();
+        var key = frame.pop();
+        var obj = frame.pop();
+
+        if (!Values.setMember(ctx, obj, key, val)) throw EngineException.ofSyntax("Can't set member '" + key + "'.");
+        if ((boolean)instr.get(0)) frame.push(val);
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execStoreVar(Context ctx, Instruction instr, Frame frame) {
+        var val = (boolean)instr.get(1) ? frame.peek() : frame.pop();
+        var i = instr.get(0);
+
+        if (i instanceof String) ctx.environment.global.set(ctx, (String)i, val);
+        else frame.scope.get((int)i).set(ctx, val);
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execStoreSelfFunc(Context ctx, Instruction instr, Frame frame) {
+        frame.scope.locals[(int)instr.get(0)].set(ctx, frame.function);
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    
+    private static Object execJmp(Context ctx, Instruction instr, Frame frame) {
+        frame.codePtr += (int)instr.get(0);
+        frame.jumpFlag = true;
+        return Values.NO_RETURN;
+    }
+    private static Object execJmpIf(Context ctx, Instruction instr, Frame frame) {
+        if (Values.toBoolean(frame.pop())) {
+            frame.codePtr += (int)instr.get(0);
+            frame.jumpFlag = true;
+        }
+        else frame.codePtr ++;
+        return Values.NO_RETURN;
+    }
+    private static Object execJmpIfNot(Context ctx, Instruction instr, Frame frame) {
+        if (Values.not(frame.pop())) {
+            frame.codePtr += (int)instr.get(0);
+            frame.jumpFlag = true;
+        }
+        else frame.codePtr ++;
+        return Values.NO_RETURN;
+    }
+
+    private static Object execTypeof(Context ctx, Instruction instr, Frame frame) {
+        String name = instr.get(0);
+        Object obj;
+
+        if (name != null) {
+            if (ctx.environment.global.has(ctx, name)) {
+                obj = ctx.environment.global.get(ctx, name);
+            }
+            else obj = null;
+        }
+        else obj = frame.pop();
+
+        frame.push(Values.type(obj));
+
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+    private static Object execNop(Context ctx, Instruction instr, Frame frame) {
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+
+    private static Object execDelete(Context ctx, Instruction instr, Frame frame) {
+        var key = frame.pop();
+        var val = frame.pop();
+
+        if (!Values.deleteMember(ctx, val, key)) throw EngineException.ofSyntax("Can't delete member '" + key + "'.");
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+
+    private static Object execOperation(Context ctx, Instruction instr, Frame frame) {
+        Operation op = instr.get(0);
+        var args = new Object[op.operands];
+
+        for (var i = op.operands - 1; i >= 0; i--) args[i] = frame.pop();
+
+        frame.push(Values.operation(ctx, op, args));
+        frame.codePtr++;
+        return Values.NO_RETURN;
+    }
+
+    public static Object exec(Context ctx, Instruction instr, Frame frame) {
+        switch (instr.type) {
+            case NOP: return execNop(ctx, instr, frame);
+            case RETURN: return execReturn(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);
+            case CALL_NEW: return execCallNew(ctx, instr, frame);
+            case TRY_START: return execTryStart(ctx, instr, frame);
+            case TRY_END: return execTryEnd(ctx, instr, frame);
+
+            case DUP: return execDup(ctx, instr, frame);
+            case PUSH_UNDEFINED:
+            case PUSH_NULL:
+            case PUSH_STRING:
+            case PUSH_NUMBER:
+            case PUSH_BOOL:
+                return execLoadValue(ctx, instr, frame);
+            case LOAD_VAR: return execLoadVar(ctx, instr, frame);
+            case LOAD_OBJ: return execLoadObj(ctx, instr, frame);
+            case LOAD_ARR: return execLoadArr(ctx, instr, frame);
+            case LOAD_FUNC: return execLoadFunc(ctx, instr, frame);
+            case LOAD_MEMBER: return execLoadMember(ctx, instr, frame);
+            case LOAD_REGEX: return execLoadRegEx(ctx, instr, frame);
+            case LOAD_GLOB: return execLoadGlob(ctx, instr, frame);
+
+            case DISCARD: return execDiscard(ctx, instr, frame);
+            case STORE_MEMBER: return execStoreMember(ctx, instr, frame);
+            case STORE_VAR: return execStoreVar(ctx, instr, frame);
+            case STORE_SELF_FUNC: return execStoreSelfFunc(ctx, instr, frame);
+            case MAKE_VAR: return execMakeVar(ctx, instr, frame);
+
+            case KEYS: return execKeys(ctx, instr, frame);
+            case DEF_PROP: return execDefProp(ctx, instr, frame);
+            case TYPEOF: return execTypeof(ctx, instr, frame);
+            case DELETE: return execDelete(ctx, instr, frame);
+
+            case JMP: return execJmp(ctx, instr, frame);
+            case JMP_IF: return execJmpIf(ctx, instr, frame);
+            case JMP_IFN: return execJmpIfNot(ctx, instr, frame);
+
+            case OPERATION: return execOperation(ctx, instr, frame);
+
+            default: throw EngineException.ofSyntax("Invalid instruction " + instr.type.name() + ".");
+        }
+    }
+}

src/java/me/topchetoeu/jscript/core/Key.java

@@ -0,0 +1,5 @@
+package me.topchetoeu.jscript.core;
+
+public class Key<T> {
+    
+}

src/java/me/topchetoeu/jscript/core/WrapperProvider.java

@@ -0,0 +1,12 @@
+package me.topchetoeu.jscript.core;
+
+import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.core.values.ObjectValue;
+
+public interface WrapperProvider {
+    public ObjectValue getProto(Class<?> obj);
+    public ObjectValue getNamespace(Class<?> obj);
+    public FunctionValue getConstr(Class<?> obj);
+
+    public WrapperProvider fork(Environment env);
+}

src/java/me/topchetoeu/jscript/core/debug/DebugContext.java

@@ -0,0 +1,133 @@
+package me.topchetoeu.jscript.core.debug;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.WeakHashMap;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.FunctionBody;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.common.mapping.FunctionMap;
+import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.core.Extensions;
+import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.core.Key;
+import me.topchetoeu.jscript.core.values.CodeFunction;
+import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+
+public class DebugContext {
+    public static final Key<DebugContext> KEY = new Key<>();
+    public static final Key<Void> IGNORE = new Key<>();
+
+    private HashMap<Filename, String> sources;
+    private WeakHashMap<FunctionBody, FunctionMap> maps;
+    private DebugHandler debugger;
+
+    public boolean attachDebugger(DebugHandler debugger) {
+        if (this.debugger != null) return false;
+
+        if (sources != null) {
+            for (var source : sources.entrySet()) debugger.onSourceLoad(source.getKey(), source.getValue());
+        }
+
+        this.debugger = debugger;
+        return true;
+    }
+    public boolean detachDebugger() {
+        this.debugger = null;
+        return true;
+    }
+
+    public DebugHandler debugger() {
+        if (debugger == null) return DebugHandler.empty();
+        else return debugger;
+    }
+
+    public FunctionMap getMap(FunctionBody func) {
+        if (maps == null) return null;
+        return maps.get(func);
+    }
+    public FunctionMap getMap(FunctionValue func) {
+        if (maps == null || !(func instanceof CodeFunction)) return null;
+        return getMap(((CodeFunction)func).body);
+    }
+    public FunctionMap getMapOrEmpty(FunctionBody func) {
+        if (maps == null) return FunctionMap.EMPTY;
+        var res = maps.get(func);
+        if (res == null) return FunctionMap.EMPTY;
+        else return res;
+    }
+    public FunctionMap getMapOrEmpty(FunctionValue func) {
+        if (maps == null || !(func instanceof CodeFunction)) return FunctionMap.EMPTY;
+        return getMapOrEmpty(((CodeFunction)func).body);
+    }
+
+    public void onFramePop(Context ctx, Frame frame) {
+        if (debugger != null) debugger.onFramePop(ctx, frame);
+    }
+    public void onFramePush(Context ctx, Frame frame) {
+        if (debugger != null) debugger.onFramePush(ctx, frame);
+    }
+    public boolean onInstruction(Context ctx, Frame frame, Instruction instruction, Object returnVal, EngineException error, boolean caught) {
+        if (debugger != null) return debugger.onInstruction(ctx, frame, instruction, returnVal, error, caught);
+        else return false;
+    }
+    public void onSource(Filename filename, String source) {
+        if (debugger != null) debugger.onSourceLoad(filename, source);
+        if (sources != null) sources.put(filename, source);
+    }
+    public void onFunctionLoad(FunctionBody func, FunctionMap map) {
+        if (maps != null) maps.put(func, map);
+        if (debugger != null) debugger.onFunctionLoad(func, map);
+    }
+
+    private DebugContext(boolean enabled) {
+        if (enabled) {
+            sources = new HashMap<>();
+            maps = new WeakHashMap<>();
+        }
+    }
+
+    public DebugContext() {
+        this(true);
+    }
+
+    public static boolean enabled(Extensions exts) {
+        return exts != null && exts.hasNotNull(KEY) && !exts.has(IGNORE);
+    }
+    public static DebugContext get(Extensions exts) {
+        if (enabled(exts)) return exts.get(KEY);
+        else return new DebugContext(false);
+    }
+
+    public static List<String> stackTrace(Context ctx) {
+        var res = new ArrayList<String>();
+        var dbgCtx = get(ctx);
+
+        for (var el : ctx.frames()) {
+            var name = el.function.name;
+
+            var map = dbgCtx.getMapOrEmpty(el.function);
+            Location loc = null;
+
+            if (map != null) {
+                loc = map.toLocation(el.codePtr, true);
+                if (loc == null) loc = map.start();
+            }
+
+            var trace = "";
+
+            if (loc != null) trace += "at " + loc.toString() + " ";
+            if (name != null && !name.equals("")) trace += "in " + name + " ";
+
+            trace = trace.trim();
+
+            if (!trace.equals("")) res.add(trace);
+        }
+
+        return res;
+    }
+}

src/java/me/topchetoeu/jscript/core/debug/DebugHandler.java

@@ -0,0 +1,74 @@
+package me.topchetoeu.jscript.core.debug;
+
+import me.topchetoeu.jscript.common.Filename;
+import me.topchetoeu.jscript.common.FunctionBody;
+import me.topchetoeu.jscript.common.Instruction;
+import me.topchetoeu.jscript.common.mapping.FunctionMap;
+import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+
+public interface DebugHandler {
+    /**
+     * Called when a script has been loaded
+     * @param filename The name of the source
+     * @param source The name of the source
+     * @param breakpoints A set of all the breakpointable locations in this source
+     * @param map The source map associated with this file. null if this source map isn't mapped
+     */
+    void onSourceLoad(Filename filename, String source);
+
+    /**
+     * Called when a function body has been loaded
+     * @param body The body loaded
+     * @param map The map of the function
+     */
+    void onFunctionLoad(FunctionBody body, FunctionMap map);
+
+    // /**
+    //  * Called when a function body has been loaded
+    //  * @param body The body loaded
+    //  * @param map The map of the function
+    //  */
+    // void onFunctionUnload(FunctionBody body, FunctionMap map);
+
+    /**
+     * Called immediatly before an instruction is executed, as well as after an instruction, if it has threw or returned.
+     * This function might pause in order to await debugging commands.
+     * @param ctx The context of execution
+     * @param frame The frame in which execution is occuring
+     * @param instruction The instruction which was or will be executed
+     * @param returnVal The return value of the instruction, Values.NO_RETURN if none
+     * @param error The error that the instruction threw, null if none
+     * @param caught Whether or not the error has been caught
+     * @return Whether or not the frame should restart (currently does nothing)
+     */
+    boolean onInstruction(Context ctx, Frame frame, Instruction instruction, Object returnVal, EngineException error, boolean caught);
+
+    /**
+     * Called immediatly before a frame has been pushed on the frame stack.
+     * This function might pause in order to await debugging commands.
+     * @param ctx The context of execution
+     * @param frame The code frame which was pushed
+     */
+    void onFramePush(Context ctx, Frame frame);
+    /**
+     * Called immediatly after a frame has been popped out of the frame stack.
+     * This function might pause in order to await debugging commands.
+     * @param ctx The context of execution
+     * @param frame The code frame which was popped out
+     */
+    void onFramePop(Context ctx, Frame frame);
+
+    public static DebugHandler empty() {
+        return new DebugHandler () {
+            @Override public void onFramePop(Context ctx, Frame frame) { }
+            @Override public void onFramePush(Context ctx, Frame frame) { }
+            @Override public boolean onInstruction(Context ctx, Frame frame, Instruction instruction, Object returnVal, EngineException error, boolean caught) {
+                return false;
+            }
+            @Override public void onSourceLoad(Filename filename, String source) { }
+            @Override public void onFunctionLoad(FunctionBody body, FunctionMap map) { }
+        };
+    }
+}

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

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.exceptions;
+package me.topchetoeu.jscript.core.exceptions;
 
 public class ConvertException extends RuntimeException {
     public final String source, target;

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

@@ -0,0 +1,109 @@
+package me.topchetoeu.jscript.core.exceptions;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import me.topchetoeu.jscript.common.Location;
+import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.core.values.ObjectValue.PlaceholderProto;
+
+public class EngineException extends RuntimeException {
+    public static class StackElement {
+        public final Location location;
+        public final String name;
+        public final Context ctx;
+
+        public boolean visible() {
+            return ctx == null || !ctx.get(Environment.HIDE_STACK, false);
+        }
+        public String toString() {
+            var res = "";
+            var loc = location;
+
+            if (loc != null) res += "at " + loc.toString() + " ";
+            if (name != null && !name.equals("")) res += "in " + name + " ";
+
+            return res.trim();
+        }
+
+        public StackElement(Context ctx, Location location, String name) {
+            if (name != null) name = name.trim();
+            if (name.equals("")) name = null;
+
+            if (ctx == null) this.ctx = null;
+            else this.ctx = new Context(ctx.environment);
+            this.location = location;
+            this.name = name;
+        }
+    }
+
+    public final Object value;
+    public EngineException cause;
+    public Environment env = null;
+    public final List<StackElement> stackTrace = new ArrayList<>();
+
+    public EngineException add(Context ctx, String name, Location location) {
+        var el = new StackElement(ctx, location, name);
+        if (el.name == null && el.location == null) return this;
+        setCtx(ctx);
+        stackTrace.add(el);
+        return this;
+    }
+    public EngineException setCause(EngineException cause) {
+        this.cause = cause;
+        return this;
+    }
+    public EngineException setCtx(Context ctx) {
+        if (this.env == null) this.env = ctx.environment;
+        return this;
+    }
+
+    public String toString(Context ctx) {
+        var ss = new StringBuilder();
+        try {
+            ss.append(Values.toString(ctx, value)).append('\n');
+        }
+        catch (EngineException e) {
+            ss.append("[Error while stringifying]\n");
+        }
+        for (var line : stackTrace) {
+            if (line.visible()) ss.append("    ").append(line.toString()).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 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;
+    }
+
+    public EngineException(Object error) {
+        super(error == null ? "null" : error.toString());
+
+        this.value = error;
+        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(null, msg, PlaceholderProto.ERROR));
+    }
+    public static EngineException ofSyntax(String msg) {
+        return new EngineException(err(null, msg, PlaceholderProto.SYNTAX_ERROR));
+    }
+    public static EngineException ofType(String msg) {
+        return new EngineException(err(null, msg, PlaceholderProto.TYPE_ERROR));
+    }
+    public static EngineException ofRange(String msg) {
+        return new EngineException(err(null, msg, PlaceholderProto.RANGE_ERROR));
+    }
+}

src/java/me/topchetoeu/jscript/core/exceptions/InterruptException.java

@@ -0,0 +1,8 @@
+package me.topchetoeu.jscript.core.exceptions;
+
+public class InterruptException extends RuntimeException {
+    public InterruptException() { }
+    public InterruptException(Throwable e) {
+        super(e);
+    }
+}

src/java/me/topchetoeu/jscript/core/exceptions/SyntaxException.java

@@ -1,6 +1,6 @@
-package me.topchetoeu.jscript.exceptions;
+package me.topchetoeu.jscript.core.exceptions;
 
-import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.common.Location;
 
 public class SyntaxException extends RuntimeException {
     public final Location loc;

src/java/me/topchetoeu/jscript/core/scope/GlobalScope.java

@@ -0,0 +1,80 @@
+package me.topchetoeu.jscript.core.scope;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import me.topchetoeu.jscript.common.ScopeRecord;
+import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.core.values.FunctionValue;
+import me.topchetoeu.jscript.core.values.NativeFunction;
+import me.topchetoeu.jscript.core.values.ObjectValue;
+import me.topchetoeu.jscript.core.values.Values;
+import me.topchetoeu.jscript.core.exceptions.EngineException;
+
+public class GlobalScope implements ScopeRecord {
+    public final ObjectValue obj;
+
+    public boolean has(Context ctx, String name) {
+        return Values.hasMember(null, obj, name, false);
+    }
+    public Object getKey(String name) {
+        return name;
+    }
+
+    public GlobalScope globalChild() {
+        var obj = new ObjectValue();
+        Values.setPrototype(null, obj, this.obj);
+        return new GlobalScope(obj);
+    }
+    public LocalScopeRecord child() {
+        return new LocalScopeRecord();
+    }
+
+    public Object define(String name) {
+        if (Values.hasMember(Context.NULL, obj, name, false)) return name;
+        obj.defineProperty(Context.NULL, name, null);
+        return name;
+    }
+    public void define(String name, Variable val) {
+        obj.defineProperty(Context.NULL, name,
+            new NativeFunction("get " + name, args -> val.get(args.ctx)),
+            new NativeFunction("set " + name, args -> { val.set(args.ctx, args.get(0)); return null; }),
+            true, true
+        );
+    }
+    public void define(Context ctx, String name, boolean readonly, Object val) {
+        obj.defineProperty(ctx, name, val, readonly, true, true);
+    }
+    public void define(String ...names) {
+        for (var n : names) define(n);
+    }
+    public void define(boolean readonly, FunctionValue val) {
+        define(null, val.name, readonly, val);
+    }
+
+    public Object get(Context ctx, String name) {
+        if (!Values.hasMember(ctx, obj, name, false)) throw EngineException.ofSyntax("The variable '" + name + "' doesn't exist.");
+        else return Values.getMember(ctx, obj, name);
+    }
+    public void set(Context ctx, String name, Object val) {
+        if (!Values.hasMember(ctx, obj, name, false)) throw EngineException.ofSyntax("The variable '" + name + "' doesn't exist.");
+        if (!Values.setMember(ctx, obj, name, val)) throw EngineException.ofSyntax("The global '" + name + "' is readonly.");
+    }
+
+    public Set<String> keys() {
+        var res = new HashSet<String>();
+
+        for (var key : keys()) {
+            if (key instanceof String) res.add((String)key);
+        }
+
+        return res;
+    }
+
+    public GlobalScope() {
+        this.obj = new ObjectValue();
+    }
+    public GlobalScope(ObjectValue val) {
+        this.obj = val;
+    }
+}

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

@@ -0,0 +1,29 @@
+package me.topchetoeu.jscript.core.scope;
+
+import java.util.ArrayList;
+
+public class LocalScope {
+    public final ValueVariable[] captures;
+    public final ValueVariable[] locals;
+    public final ArrayList<ValueVariable> catchVars = new ArrayList<>();
+
+    public ValueVariable get(int i) {
+        if (i >= locals.length) return catchVars.get(i - locals.length);
+        if (i >= 0) return locals[i];
+        else return captures[~i];
+    }
+
+
+    public int size() {
+        return captures.length + locals.length;
+    }
+
+    public LocalScope(int n, ValueVariable[] captures) {
+        locals = new ValueVariable[n];
+        this.captures = captures;
+
+        for (int i = 0; i < n; i++) {
+            locals[i] = new ValueVariable(false, null);
+        }
+    }
+}

src/java/me/topchetoeu/jscript/core/scope/LocalScopeRecord.java

@@ -1,25 +1,24 @@
-package me.topchetoeu.jscript.engine.scope;
+package me.topchetoeu.jscript.core.scope;
 
 import java.util.ArrayList;
 
-import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.common.ScopeRecord;
 
 public class LocalScopeRecord implements ScopeRecord {
     public final LocalScopeRecord parent;
-    public final GlobalScope global;
 
     private final ArrayList<String> captures = new ArrayList<>();
     private final ArrayList<String> locals = new ArrayList<>();
 
+    public String[] captures() {
+        return captures.toArray(String[]::new);
+    }
     public String[] locals() {
         return locals.toArray(String[]::new);
     }
 
-    @Override
-    public LocalScopeRecord parent() { return parent; }
-
     public LocalScopeRecord child() {
-        return new LocalScopeRecord(this, global);
+        return new LocalScopeRecord(this);
     }
 
     public int localsCount() {
@@ -59,12 +58,6 @@ public class LocalScopeRecord implements ScopeRecord {
 
         return name;
     }
-    public boolean has(Context ctx, String name) throws InterruptedException {
-        return
-            global.has(ctx, name) ||
-            locals.contains(name) ||
-            parent != null && parent.has(ctx, name);
-    }
     public Object define(String name, boolean force) {
         if (!force && locals.contains(name)) return locals.indexOf(name);
         locals.add(name);
@@ -77,12 +70,10 @@ public class LocalScopeRecord implements ScopeRecord {
         locals.remove(locals.size() - 1);
     }
 
-    public LocalScopeRecord(GlobalScope global) {
+    public LocalScopeRecord() {
         this.parent = null;
-        this.global = global;
     }
-    public LocalScopeRecord(LocalScopeRecord parent, GlobalScope global) {
+    public LocalScopeRecord(LocalScopeRecord parent) {
         this.parent = parent;
-        this.global = global;
     }
 }

src/java/me/topchetoeu/jscript/core/scope/ValueVariable.java

@@ -1,7 +1,7 @@
-package me.topchetoeu.jscript.engine.scope;
+package me.topchetoeu.jscript.core.scope;
 
-import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.core.Context;
-import me.topchetoeu.jscript.engine.values.Values;
+import me.topchetoeu.jscript.core.values.Values;
 
 public class ValueVariable implements Variable {
     public boolean readonly;

src/java/me/topchetoeu/jscript/core/scope/Variable.java

@@ -0,0 +1,9 @@
+package me.topchetoeu.jscript.core.scope;
+
+import me.topchetoeu.jscript.core.Context;
+
+public interface Variable {
+    Object get(Context ctx);
+    default boolean readonly() { return true; }
+    default void set(Context ctx, Object val) { }
+}

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

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.engine.values;
+package me.topchetoeu.jscript.core.values;
 
 import java.util.Arrays;
 import java.util.Collection;
@@ -6,7 +6,7 @@ import java.util.Comparator;
 import java.util.Iterator;
 import java.util.List;
 
-import me.topchetoeu.jscript.engine.Context;
+import me.topchetoeu.jscript.core.Context;
 
 // TODO: Make methods generic
 public class ArrayValue extends ObjectValue implements Iterable<Object> {
@@ -14,13 +14,14 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
     private Object[] values;
     private int size;
 
-    private void alloc(int index) {
+    private Object[] alloc(int index) {
-        if (index < values.length) return;
+        index++;
+        if (index < values.length) return values;
         if (index < values.length * 2) index = values.length * 2;
 
         var arr = new Object[index];
         System.arraycopy(values, 0, arr, 0, values.length);
-        values = arr;
+        return arr;
     }
 
     public int size() { return size; }
@@ -28,7 +29,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         if (val < 0) return false;
         if (size > val) shrink(size - val);
         else {
-            alloc(val);
+            values = alloc(val);
             size = val;
         }
         return true;
@@ -43,7 +44,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
     public void set(Context ctx, int i, Object val) {
         if (i < 0) return;
 
-        alloc(i);
+        values = alloc(i);
 
         val = Values.normalize(ctx, val);
         if (val == null) val = UNDEFINED;
@@ -51,7 +52,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         if (i >= size) size = i + 1;
     }
     public boolean has(int i) {
-        return i >= 0 && i < values.length && values[i] != null;
+        return i >= 0 && i < size && values[i] != null;
     }
     public void remove(int i) {
         if (i < 0 || i >= values.length) return;
@@ -81,12 +82,20 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
             else arr[i + sourceStart] = values[i + destStart];
         }
     }
-    public void copyTo(Context ctx, ArrayValue arr, int sourceStart, int destStart, int count) {
+    public void copyTo(ArrayValue arr, int sourceStart, int destStart, int count) {
+        if (arr == this) {
+            move(sourceStart, destStart, count);
+            return;
+        }
+
         // Iterate in reverse to reallocate at most once
+        if (destStart + count > arr.size) arr.size = destStart + count;
+
         for (var i = count - 1; i >= 0; i--) {
-            if (i + sourceStart < 0 || i + sourceStart >= size) arr.set(ctx, i + destStart, null);
+            if (i + sourceStart < 0 || i + sourceStart >= size) arr.remove(i + destStart);
-            if (values[i + sourceStart] == UNDEFINED) arr.set(ctx, i + destStart, null);
+            if (values[i + sourceStart] == UNDEFINED) arr.set(null, i + destStart, null);
-            else arr.set(ctx, i + destStart, values[i + sourceStart]);
+            else if (values[i + sourceStart] == null) arr.remove(i + destStart);
+            else arr.set(null, i + destStart, values[i + sourceStart]);
         }
     }
 
@@ -97,7 +106,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
     }
 
     public void move(int srcI, int dstI, int n) {
-        alloc(dstI + n);
+        values = alloc(dstI + n);
 
         System.arraycopy(values, srcI, values, dstI, n);
 
@@ -122,7 +131,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
     }
 
     @Override
-    protected Object getField(Context ctx, Object key) throws InterruptedException {
+    protected Object getField(Context ctx, Object key) {
         if (key instanceof Number) {
             var i = ((Number)key).doubleValue();
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -133,7 +142,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         return super.getField(ctx, key);
     }
     @Override
-    protected boolean setField(Context ctx, Object key, Object val) throws InterruptedException {
+    protected boolean setField(Context ctx, Object key, Object val) {
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -145,7 +154,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         return super.setField(ctx, key, val);
     }
     @Override
-    protected boolean hasField(Context ctx, Object key) throws InterruptedException {
+    protected boolean hasField(Context ctx, Object key) {
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -156,7 +165,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         return super.hasField(ctx, key);
     }
     @Override
-    protected void deleteField(Context ctx, Object key) throws InterruptedException {
+    protected void deleteField(Context ctx, Object key) {
         if (key instanceof Number) {
             var i = Values.number(key);
             if (i >= 0 && i - Math.floor(i) == 0) {
@@ -212,7 +221,7 @@ public class ArrayValue extends ObjectValue implements Iterable<Object> {
         for (var i = 0; i < size; i++) this.values[i] = Values.normalize(ctx, values[i]);
     }
 
-    public static ArrayValue of(Context ctx, Collection<Object> values) {
+    public static ArrayValue of(Context ctx, Collection<?> values) {
         return new ArrayValue(ctx, values.toArray(Object[]::new));
     }
 }

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

@@ -0,0 +1,50 @@
+package me.topchetoeu.jscript.core.values;
+
+import me.topchetoeu.jscript.common.FunctionBody;
+import me.topchetoeu.jscript.core.Context;
+import me.topchetoeu.jscript.core.Environment;
+import me.topchetoeu.jscript.core.Frame;
+import me.topchetoeu.jscript.core.scope.ValueVariable;
+
+public class CodeFunction extends FunctionValue {
+    public final FunctionBody body;
+    public final ValueVariable[] captures;
+    public Environment environment;
+
+    // public Location loc() {
+    //     for (var instr : body.instructions) {
+    //         if (instr.location != null) return instr.location;
+    //     }
+    //     return null;
+    // }
+    // public String readable() {
+    //     var loc = loc();
+    //     if (loc == null) return name;
+    //     else if (name.equals("")) return loc.toString();
+    //     else return name + "@" + loc;
+    // }
+
+    @Override
+    public Object call(Context ctx, Object thisArg, Object ...args) {
+        var frame = new Frame(ctx, thisArg, args, this);
+
+        frame.onPush();
+
+        try {
+            while (true) {
+                var res = frame.next(Values.NO_RETURN, Values.NO_RETURN, null);
+                if (res != Values.NO_RETURN) return res;
+            }
+        }
+        finally {
+            frame.onPop();
+        }
+    }
+
+    public CodeFunction(Environment environment, String name, FunctionBody body, ValueVariable[] captures) {
+        super(name, body.argsN);
+        this.captures = captures;
+        this.environment = environment;
+        this.body = body;
+    }
+}

src/java/me/topchetoeu/jscript/core/values/ConvertHint.java

@@ -1,4 +1,4 @@
-package me.topchetoeu.jscript.engine.frame;
+package me.topchetoeu.jscript.core.values;
 
 public enum ConvertHint {
     TOSTRING,