W9 JavaScript Engine

A High-Performance, Spec-Compliant JavaScript Execution Engine Architected in Modern C++23.

Overview

W9 is an independent, production-grade JavaScript runtime and execution environment engineered from the ground up to power custom, next-generation browser engines. Developed as a core ecosystem product by Khwarzma, W9 focuses on low-latency execution, predictable memory management, and modern ECMAScript standard compliance, while maintaining a decoupled, modular pipeline.

Note

W9 is strictly an independent script execution engine. It intentionally isolates itself from HTML/CSS parsing, layout generation, and graphics rendering, providing clean host-binding APIs for external browser shells.

The goal of W9 is to provide a complete JavaScript runtime capable of executing modern ECMAScript applications while maintaining a clean, modular, and extensible architecture.

W9 is designed as an independent engine.

It does not implement:

• HTML parsing
• CSS parsing
• Layout
• Rendering

Instead, W9 provides the JavaScript execution environment that can be integrated with an external browser engine.

---

Vision

The long-term vision of W9 is to create a production-grade JavaScript engine capable of running modern web applications with high performance and strong compatibility.

W9 separates responsibilities:

Browser Engine

Responsible for:

• HTML
• CSS
• DOM
• CSSOM
• Layout
• Painting
• Rendering
• User Interface

W9 Engine

Responsible for:

• JavaScript execution
• ECMAScript runtime
• Memory management
• Compilation pipeline
• Virtual Machine
• JIT compilation
• Browser API bindings

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Goals

Performance First

W9 focuses on:

• Fast execution
• Efficient memory usage
• Optimized runtime
• Native machine code generation

Cross Platform

Target platforms:

• Windows
• Linux
• macOS

Target architectures:

• x64
• ARM64

Modern JavaScript Support

Planned support:

• ES6+
• Classes
• Modules
• Promises
• Async/Await
• Modern language features

---

Features

Current

• C++23 foundation
• Modular architecture
• Build system
• Engine documentation
• Extensible design

Planned

Compiler

• Lexer
• Parser
• AST
• Intermediate Representation
• Bytecode generation

Runtime

• JavaScript values
• Objects
• Functions
• Scope system
• Built-in objects

Execution

• Bytecode Virtual Machine
• Execution stack
• Call frames
• Error handling

Optimization

• JIT compiler
• LLVM backend
• Native machine code generation
• Runtime optimization

Memory

• Heap management
• Garbage collector
• Memory optimization

Browser Integration

Binding support:

• window
• document
• navigator
• location
• fetch
• timers
• storage

---

Architecture

High level pipeline:

JavaScript Source Code

|

v

Lexer

|

v

Parser

|

v

Abstract Syntax Tree (AST)

|

v

Intermediate Representation (IR)

|

v

Bytecode

|

v

Virtual Machine

|

v

JIT Compiler

|

v

Native Machine Code

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Project Structure

W9/

├── engine/

│ ├── lexer/

│ ├── parser/

│ ├── ast/

│ ├── runtime/

│ ├── vm/

│ ├── jit/

│ ├── gc/

│ └── bindings/

├── docs/

├── tests/

├── examples/

├── include/

├── src/

├── CMakeLists.txt

├── Makefile

└── README.md

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Production-Grade Testing & Verification

W9 maintains architectural integrity through a strict core verification suite. Every subsystem—from semantic analysis to native code emission—is covered by localized simulation fixtures.

Core Test Suite Layout

Our verification pipeline guarantees engine stability across the following layers:

• Lexical Analysis: Validation of lookaheads, tokenization boundaries, and standard keyword/literal identification (LET, CONST, expressions).
• AST Precedence: Verification of operator precedence trees (e.g., ensuring 5 + 10 * 2 correctly evaluates AST node weight as 5 + (10 * 2)).
• Virtual Machine (VM): Bytecode compilation tracking, chunk optimization, and operational code stack execution (e.g., OP_CONSTANT).
• Memory Management: Heap allocation tracing and deterministic Garbage Collection (GC) sweep routines via live object marking.
• JIT Compilation Pipeline: Hot code block threshold detection and structured native machine code generation ready for LLVM backend emission.
• Host Bridge Injection: Rigorous testing of the internal environment registry to safely expose host-defined browser APIs (window, document, alert) straight into the JS runtime environment.

To compile and execute the test pipeline, run:

# Target the core test suite execution
g++ -std=c++23 tests/main_test.cpp src/lexer.cpp src/parser.cpp src/vm.cpp src/gc.cpp src/jit.cpp src/bindings.cpp -o w9_test_suite
./w9_test_suite


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# Build Requirements


Requirements:


- C++23 compiler
- CMake 3.20+
- Make


Recommended:


- GCC 13+
- Clang 16+
- MSVC latest



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# Building


Clone:


```bash
git clone https://github.com/khwarzma/W9.git

cd W9

Build:

make

or:

mkdir build

cd build

cmake ..

make
Running

After building:

make run

The engine should start successfully.

Example future usage:

console.log("Hello from W9");
Development Roadmap
Phase 0

Project foundation

Repository setup
Documentation
Build system
Phase 1

JavaScript Lexer

Tokens
Keywords
Literals
Phase 2

Parser and AST

Expressions
Statements
Functions
Phase 3

Runtime System

Objects
Values
Functions
Phase 4

Bytecode Virtual Machine

Instructions
Execution
Stack management
Phase 5

JavaScript Compatibility

ES6+
Promises
Async/Await
Modules
Phase 6

Garbage Collector

Heap
Allocation
Collection
Phase 7

JIT Compiler

LLVM integration
Native code generation
Phase 8

Browser Bindings

DOM bindings
Browser APIs
Phase 9

Compatibility Testing

ECMAScript tests
Web compatibility
Development Principles

W9 follows:

Clean architecture
Modular components
Stable interfaces
Performance oriented design
Long-term maintainability
Contributing

Contributions are welcome.

Before adding features:

Review architecture documents
Keep modules independent
Add tests
Maintain code quality
Documentation

Detailed design documents:

docs/

├── ARCHITECTURE.md

├── ENGINE_DESIGN.md

├── API_DESIGN.md

└── ROADMAP.md