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<h1>OxideJS：面向 AI Agent 的轻量级 JavaScript 执行引擎</h1>
<p>
<img alt="Rust" src="https://img.shields.io/badge/Rust-1.80%2B-orange?style=for-the-badge&logo=rust" />
<img alt="Platform" src="https://img.shields.io/badge/Platform-Linux%20%7C%20macOS%20%7C%20Windows-blue?style=for-the-badge" />
<img alt="Engine" src="https://img.shields.io/badge/JS%20Engine-Non--Wrapper-success?style=for-the-badge" />
<img alt="test262" src="https://img.shields.io/badge/test262-Integrated-purple?style=for-the-badge" />
</p>
</center>
## 1. 项目简介
OxideJS 是一个使用 Rust 编写的轻量级 JavaScript 执行引擎，面向短时、高频、即时执行的脚本运行场景，例如 Agent 工具调用、脚本沙箱、数据转换流水线和嵌入式运行时。
OxideJS 不是 V8、QuickJS、JavaScriptCore 或其他现有引擎的封装。项目实现了自己的编译流水线、字节码格式、虚拟机、值表示、对象模型和运行时核心。
当前项目聚焦于实用 ECMAScript 子集，并通过 [test262](https://github.com/tc39/test262) 持续验证兼容性。长期目标是提供一个小型、可检查、跨平台、启动成本可预测、benchmark 可复现的 JavaScript runtime。
## 2. 特性概览
- **Rust 实现**：使用 Cargo workspace 组织 parser、compiler、VM、runtime、CLI 和 test runner。
- **自研引擎**：自研字节码、寄存器式虚拟机、对象模型和运行时状态管理。
- **寄存器式 VM**：使用固定寄存器文件执行字节码，减少栈式 VM 中频繁 push/pop 的开销。
- **NaN-boxing 值表示**：用 64-bit 值统一表示 number、boolean、object、string、null 和 undefined。
- **Shape 对象布局**：使用隐藏类思想描述对象属性布局，便于缓存属性偏移。
- **Inline Cache 方向**：围绕 shape/offset 缓存设计属性访问路径。
- **共享运行时 Kernel**：统一管理字符串驻留、Shape、编译缓存、属性模板和内置对象。
- **test262 runner**：内置兼容性测试运行器，输出 pass / fail / skip 统计。
## 3. 架构
OxideJS 采用经典的 parse -> compile -> execute 流水线，同时使用 **单 Kernel、多 VM** 的运行时结构：一个 `OxideKernel` 保存可共享的字符串、Shape、编译缓存、属性模板和内置对象；多个 `oxide_vm` 实例面向不同执行请求独立运行，并共同引用同一个 Kernel。
```text
+----------------------+
| oxide_kernel |
|----------------------|
| StringForge |
| ShapeForge |
| CodeForge |
| PropForge |
| BuiltinWorld |
+----------+-----------+
|
shared Arc<OxideKernel> | shared Arc<OxideKernel>
+-----------------+-----------------+
| | |
v v v
+----------------+ +----------------+ +----------------+
| oxide_vm | | oxide_vm | | oxide_vm |
|----------------| |----------------| |----------------|
| registers | | registers | | registers |
| call frames | | call frames | | call frames |
| local epoch | | local epoch | | local epoch |
+-------+--------+ +-------+--------+ +-------+--------+
| | |
v v v
JsValue Result JsValue Result JsValue Result
Per request pipeline:
JavaScript Source
|
v
+------------------+
| oxide_parser | 解析源码，生成 AST
+------------------+
|
v
+------------------+
| oxide_compiler | AST 编译为寄存器式字节码；可命中 Kernel.CodeForge
+------------------+
|
v
+------------------+
| oxide_vm | 从 VM Pool 获取实例并执行字节码
+------------------+
```
核心组件：
1. **Parser 前端**：通过 `oxide_parser` 将源码解析为 AST。
2. **字节码编译器**：将 AST 降低为 OxideJS 字节码、常量池和寄存器布局。
3. **寄存器式 VM**：`oxide_vm` 读取字节码并使用固定寄存器文件执行；每个 VM 保持自己的寄存器、调用栈和本地 epoch。
4. **值系统**：`JsValue` 负责紧凑表示 JavaScript 运行时值。
5. **对象模型**：对象通过 Shape ID 描述属性布局。
6. **运行时 Kernel**：`OxideKernel` 保存可跨 VM 复用的共享状态；多个 VM 通过 `Arc<OxideKernel>` 引用同一个 Kernel，避免重复初始化字符串池、Shape 表、内置对象和编译缓存。
7. **内置对象层**：常用内置对象和方法由 Rust 原生实现。
8. **兼容性测试层**：`oxide_test262` 运行 test262 用例并输出统计结果。
## 4. 仓库结构
```text
project-root/
├── Cargo.toml
├── README.md
├── crates/
│ ├── oxide_parser/ # JavaScript parser 接入层
│ ├── oxide_compiler/ # AST -> bytecode 编译器
│ ├── oxide_types/ # JsValue、JsObject、Shape、内存基础类型
│ ├── oxide_kernel/ # 共享运行时状态和内置对象注册
│ ├── oxide_vm/ # 字节码 VM 和运行时执行逻辑
│ ├── oxide_api/ # 嵌入式 API 预留层
│ ├── oxide_cli/ # 命令行工具
│ └── oxide_test262/ # test262 兼容性测试运行器
└── tests/
└── test262/ # 本地 test262 测试套件
```
## 5. 构建
### 构建全部 crate
```bash
cargo build --release
```
### 运行单元测试
```bash
cargo test
```
## 6. CLI 使用
### 执行源码片段
```bash
cargo run --release -p oxide_cli -- eval "1 + 2"
```
### 执行文件
```bash
cargo run --release -p oxide_cli -- run examples/demo.js
```
### 打印编译后的字节码
```bash
cargo run --release -p oxide_cli -- compile -e "1 + 2"
```
### 启动 REPL
```bash
cargo run --release -p oxide_cli
```
## 7. test262 兼容性测试
OxideJS 包含独立的 test262 runner：
```bash
cargo run --release -p oxide_test262
```
运行指定子目录：
```bash
cargo run --release -p oxide_test262 -- tests/test262/test language/expressions
```
runner 会输出：
- 发现的测试文件总数；
- pass / fail / skip 数量；
- 全量通过率；
- 实际执行样本通过率；
- 失败类别统计；
- 按目录拆分的结果（取决于 runner 版本）。
兼容性数字属于开发过程指标。发布正式 benchmark 或兼容性结论前，应基于当前 checkout 的 test262 版本重新生成结果。
## 8. Benchmark
Benchmark 工作围绕可复现脚本和可比较 baseline 展开。
计划中的 benchmark 分组：
| 分组 | 目的 | 状态 |
|------|------|------|
| 表达式 microbenchmark | 算术、比较、逻辑操作 | planned |
| 对象 / 属性访问 benchmark | 对象创建和属性访问路径 | planned |
| Array / String benchmark | 常用内置对象操作 | planned |
| 函数调用 benchmark | 字节码 call/return 与 native call 开销 | planned |
| Agent 风格 workload | 短时、重复结构脚本和数据转换 | planned |
| JetStream 2.0 子集 | 依赖兼容性的 JS benchmark 覆盖 | planned |
当前研究用 baseline：
- QuickJS
- Boa
- JerryScript
[TODO] 完工时放与其他 baseline 的对比表格
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