5A59 / Zvm
Licence: apache-2.0
A lightweight jvm written by python
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Zvm
简介
一款 python 实现的 "超轻量级" jvm 的实现 (其实就是只实现了主要功能)
"完美"运行各种姿势的 HelloWorld
如何使用
方法一:
- 在 test 目录下新建 .java 文件,可参考 Main.java (因为重写了一些 jdk,所以需要在这个目录下编译,为什么重写 jdk,因为 jdk 中很多 native 方法,这次又没有实现 native 方法,so sad)
- javac 编译
- 在 Zvm 目录下运行 python3 Zvm.py test/Main
方法二:
直接工程导入 pycharm 运行 test.py 吧
主要实现部分
class 文件解析
类加载
运行时数据区
指令解释器
基本指令集 (总共 205 条,实现了估计 190 多条吧)
简易 gc
简易线程
简易 jdk 库
可用功能
基本运算 (加减乘除与或位移...)
输出
多线程运算 (但是没有加同步)
类加载,继承,多态
数组操作 (只支持一维数组)
gc (模拟 gc)
异常处理
TODO
代码整理
方法分派采用 vtable
interface
多维数组
native 方法
方法,变量验证
class_loader 读取 jar zip 文件
参考资料
<java 虚拟机规范>
<揭秘 java 虚拟机>
<HotSpot 实战>
<自己动手写 java 虚拟机>
...
运行展示
LAST
enjoy it
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