中文

Plugin ASM

PASM 是一个轻量级、Mixin 风格的字节码注入框架，专为 Paper / Folia 服务端设计。它允许你通过简单的注解，在运行时修改任意类的字节码——无需反射，无需继承，无性能损耗。

🎯 目标：让 Bukkit/Paper 插件开发者能像写普通 Java 一样实现热修补、API 增强、事件拦截等操作，而不触碰复杂的 ASM 细节。

✨ 核心特性

特性	说明
🚀 Mixin 式注入	@Pasm + @Inject 定义目标类与方法，框架自动合并字节码
🩸全注入类型	BEFORE / AFTER / REPLACE / HEAD / TAIL（AROUND 降级为 REPLACE）
🏗️ 构造函数注入	支持，自动插入 super() 之后
🔥异常处理兼容	try-catch-finally 完整复制，标签映射正确
📏宽类型自动偏移	long / double 参数自动处理双槽位，无需手动计算 this 偏移
⚔️ REPLACE 独占	同一方法若存在 REPLACE，自动忽略其他注入（符合 Mixin 规范）
🧩 ASM 处理器钩子	在 pasm.json 中声明 asms 数组，实现 PasmAsmProcessor 接口，可在 premain 前后执行自定义字节码操作
📦插件式扫描	将 pasm.json 放入插件 Jar 根目录，PASM 自动扫描所有注入点

📋 环境要求

Java 8 - 21
Minecraft 1.0+
Maven 或 Gradle（仅编译插件时需要）

📥 使用方法

去Github或Modrinth下载最新的Plugin ASM
添加到服务器根目录，添加后，结构应该如下：

server
| -> paper-1.xx.x-xx.jar
| -> pasm-x.x.x.jar
| -> plugins
    | -> 一些插件.jar

修改你的启动命令，修改后，应该如下：

java -javaagent:pasm-x.x.x.jar -jar paper-1.xx.x-xx.jar

使用Plugin ASM来字节码注入

参考Wiki

🧪 测试与兼容性

PASM 已在以下场景通过完整测试：

✅ BEFORE、AFTER、REPLACE、HEAD、TAIL全类型覆盖
✅ 构造函数 <init> 注入
✅ 包含 try-catch-finally 的复杂方法
✅ 参数含 long / double 的宽类型方法（静态→非静态、静态→静态）
✅ 同一方法的多个 REPLACE 冲突检测（仅执行优先级最高者）
✅ 无 pasms 仅有 asms 的配置
✅ Paper 1.21.11 / Java 21

已知限制（将在后续版本改进）：

AROUND 注入暂未实现，使用时会降级为 REPLACE 并输出警告。
热加载功能尚不稳定，不建议生产环境使用。
不支持修改 native 方法或抽象方法。

📦 如何构建 PASM 本体（仅框架维护者）

git clone https://github.com/laolizhennui/Plugin-ASM.git
cd Plugin-ASM
mvn clean package

生成产物：target/pasm-x.x.x.jar（这就是 Java Agent）

🤝 参与贡献

PASM 还是一个年轻的项目，欢迎任何形式的贡献！你可以：

提交 Issue：报告 Bug 或提议新功能
Pull Request：修复代码、完善文档
分享你的使用案例

期待你的 Star ⭐ 和 Fork 🍴！

📄 许可证

LGPL License

最后——PASM 并不是要取代 Mixin，而是为 Paper 开发者提供一个更简单、更符合直觉的字节码注入选择。如果你喜欢它，请告诉你的朋友；如果你遇到问题，请告诉我们。 Happy Coding! 🎮🔧

English

Plugin ASM

PASM is a lightweight, Mixin‑style bytecode injection framework designed specifically for Paper / Folia server environments. It allows you to modify the bytecode of arbitrary classes at runtime using simple annotations—no reflection, no inheritance, zero performance penalty.

🎯 Goal: Let Bukkit/Paper plugin developers implement hot‑patches, API enhancements, event interceptors, and more—* just by writing plain Java, without touching complex ASM internals*.

✨ Core Features

Feature	Description
🚀 Mixin‑style injection	@Pasm + @Inject define target class & method; the framework merges bytecode automatically.
🩸 Full injection types	BEFORE / AFTER / REPLACE / HEAD / TAIL (AROUND falls back to REPLACE with a warning).
🏗️ Constructor injection	Supports ; automatically inserted after super() call.
🔥 Exception‑handler compatibility	Full replication of try‑catch‑finally blocks; correct label mapping.
📏 Automatic wide‑type offset	long / double parameters are handled as double‑slots; no manual calculation of this offset.
⚔️ Exclusive REPLACE	If a method has multiple REPLACE injections, only the one with highest priority is applied.
🧩 ASM processor hooks	Declare asms array in pasm.json; implement PasmAsmProcessor interface to run custom bytecode operations before/after premain.
📦 Plugin‑style scanning	Place pasm.json in your plugin JAR root; PASM automatically discovers all injection points.

📋 Environment Requirements

Java 8–21
Minecraft 1.0+
Maven or Gradle(only needed when compiling your plugin)

📥 Installation & Setup

Download the latest Plugin ASM from GitHub or Modrinth
Place it in your server root directory. The structure should look like this:

server
| -> paper-1.xx.x-xx.jar
| -> pasm-x.x.x.jar
| -> plugins
    | -> some-plugin.jar

Modify your startup command accordingly:

java -javaagent:pasm-x.x.x.jar -jar paper-1.xx.x-xx.jar

🛠️ Using Plugin ASM for Bytecode Injection

Refer to the Wiki for detailed usage and examples.

🧪 Testing & Compatibility

PASM has been fully tested in the following scenarios:

✅ BEFORE, AFTER, REPLACE, HEAD, TAIL–all types covered
✅ Constructor(<init>) injection
✅ Methods containing try‑catch‑finally blocks
✅ Methods with long / double parameters(static → non‑static, static → static)
✅ Conflict detection for multiple REPLACE injectors on the same method(only the highest priority runs)
✅ Configuration with asms only(no pasms)
✅ Paper 1.21.11 / Java 21

Known limitations(to be improved in future versions):

AROUND injection is not yet implemented; using it will fall back to REPLACE and emit a warning.
Hot‑reload is experimental and not recommended for production.
Native methods and abstract methods cannot be modified.

📦 How to Build PASM Itself(Framework Maintainers Only)

git clone https://github.com/laolizhennui/Plugin-ASM.git
cd Plugin-ASM
mvn clean package

Output artifact: target/pasm-x.x.x.jar–this is the Java Agent.

🤝 Contributing

PASM is still a young project, and contributions of any form are welcome! You can:

Submit an issue: report bugs or suggest new features
Pull Request: fix code, improve documentation
Share your use cases

We look forward to your Star ⭐ and Fork 🍴!

📄 License

LGPL License

Finally–PASM is not meant to replace Mixin, but to offer Paper developers a simpler, more intuitive choice for bytecode injection. If you like it, tell your friends; if you encounter problems, tell us. Happy Coding! 🎮🔧