mirror of
https://github.com/FranzHaidnor/haidnorJVM.git
synced 2026-03-13 21:43:42 +08:00
715 lines
23 KiB
Markdown
715 lines
23 KiB
Markdown
# haidnorJVM
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使用 Java17 编写的 Java 虚拟机
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## 意义
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1. 纸上得来终觉浅，绝知此事要躬行。只学习 JVM 机制和理论，很多时候任然觉得缺乏那种大彻大悟之感
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2. 使用简单的方式实现 JVM，用于学习理解 JVM 运行原理
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## 主要技术选型
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* [Java 17](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html)
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* [Apache Commons BCEL](https://commons.apache.org/proper/commons-bcel/)
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* [Apache Commons CLI](https://commons.apache.org/proper/commons-cli/)
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# 实现功能
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* 支持基本数据类型数学运算
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* 支持循环、条件结构代码
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* 支持创建对象，访问对象
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* 支持多态
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* 支持反射
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* 支持访问静态方法
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* 支持异常
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# 局限性
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* 不支持多线程
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* 垃圾回收依靠宿主 JVM
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# 快速体验
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## 你需要准备什么
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1. 集成开发环境 (IDE)。你可以选择包括 IntelliJ IDEA、Spring Tools、Visual Studio Code 或 Eclipse 等等
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2. JDK 17。并配置 JAVA_HOME
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3. JDK 8。haidnorJVM 的主要目标是运行 Java8 本版的字节码文件。(但 haidnorJVM 没有强制要求字节码文件是 Java8 版本)
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4. Maven
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## 配置 haidnorJVM
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### 配置日志输出级别
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在 `resources\simplelogger.properties` 文件中修改日志输出级别，一般使用 `debug`、`info`
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* 配置 info 级别将不会看到任何 haidnorJVM 内部运行信息
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* 配置 debug 级别下运行将会非常友好的输出 JVM 正在执行的栈信息 (例如使用 haidnorJVM 运行以下代码)
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```java
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public class Demo5 {
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public static void main(String[] args) {
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String str = method1("hello world");
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method1(str);
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}
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public static String method1(String s) {
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return method2(s);
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}
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public static String method2(String s) {
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return method3(s);
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}
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public static String method3(String s) {
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System.out.println(s);
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return "你好 世界";
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}
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}
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```
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### 配置 rt.jar
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修改 `haidnorJVM.properties` 文件中的内容。配置 rt.jar 的绝对路径，例如`rt.jar=D:/Program Files/Java/jdk1.8.0_361/jre/lib/rt.jar`
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## 运行单元测试用例
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打开 test 目录下的 `haidnor.jvm.test.TestJVM` 类文件。 这是 haidnorJVM 功能的主要测试类。 里面的测试方法可以解析并加载一些class字节码文件。
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```java
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@Test
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public void test() throws Exception {
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runMainClass(HelloWorld.class);
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}
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```
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例如以上代码会加载 HelloWorld.class 类在 target 目录下的字节码文件，然后使用 haidnorJVM 运行其中的 main 函数。你可以使用打断点的方式看到 haidnorJVM 是如何解释运行 Java 字节码的。
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值得注意的是，这种方式编译运行的字节码文件是基于 java17 版本的。
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## 运行 .class 文件
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1. 使用 maven 命令将 haidnorJVM 编译打包，得到 `haidnorJVM-1.0.jar` 文件
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2. 编写一个简单的程序，例如以下代码
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```java
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public class HelloWorld {
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public static void main(String[] args) {
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System.out.println("HelloWorld");
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}
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}
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```
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3. 编译代码，得到 HelloWorld.class 文件。（推荐使用 JDK8 进行编译）
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4. 使用 haidnorJVM 运行程序。执行命令 `java -jar haidnorJVM-1.0-SNAPSHOT.jar -class R:\HelloWorld.class`。注意需要 class 文件的绝对路径
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## 运行 .jar 文件
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1. 使用 maven 命令将 haidnorJVM 编译打包，得到 `haidnorJVM-1.0.jar` 文件
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2. 编写一个 java 项目编译打包成 .jar 文件，例如 demo.jar。要求 .jar 文件中的 META-INF/MANIFEST.MF 文件内有 `Main-Class` 属性 (含有 public static void main(String[] args) 方法的主类信息)
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3. 使用 haidnorJVM 运行程序。执行命令 `java -jar haidnorJVM-1.0-SNAPSHOT.jar -class R:\demo.jar`。注意需要 jar 文件的绝对路径
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# 已实现的 JVM 指令
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```java
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public abstract class InstructionFactory {
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public static Instruction creatInstruction(CodeStream codeStream) {
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int opcode = codeStream.readJavaVmOpcode();
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switch (opcode) {
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case Const.NOP -> {
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return new NOP(codeStream);
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}
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case Const.ACONST_NULL -> {
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return new ACONST_NULL(codeStream);
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}
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case Const.ICONST_M1 -> {
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return new ICONST_M1(codeStream);
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}
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case Const.ICONST_0 -> {
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return new ICONST_0(codeStream);
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}
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case Const.ICONST_1 -> {
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return new ICONST_1(codeStream);
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}
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case Const.ICONST_2 -> {
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return new ICONST_2(codeStream);
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}
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case Const.ICONST_3 -> {
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return new ICONST_3(codeStream);
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}
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case Const.ICONST_4 -> {
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return new ICONST_4(codeStream);
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}
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case Const.ICONST_5 -> {
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return new ICONST_5(codeStream);
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}
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case Const.LCONST_0 -> {
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return new LCONST_0(codeStream);
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}
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case Const.LCONST_1 -> {
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return new LCONST_1(codeStream);
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}
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case Const.FCONST_1 -> {
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return new FCONST_1(codeStream);
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}
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case Const.FCONST_2 -> {
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return new FCONST_2(codeStream);
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}
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case Const.DCONST_0 -> {
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return new DCONST_0(codeStream);
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}
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case Const.DCONST_1 -> {
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return new DCONST_1(codeStream);
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}
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case Const.BIPUSH -> {
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return new BIPUSH(codeStream);
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}
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case Const.SIPUSH -> {
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return new SIPUSH(codeStream);
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}
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case Const.LDC -> {
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return new LDC(codeStream);
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}
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case Const.LDC_W -> {
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return new LDC_W(codeStream);
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}
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case Const.LDC2_W -> {
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return new LDC2W(codeStream);
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}
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case Const.ILOAD -> {
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return new ILOAD(codeStream);
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}
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case Const.LLOAD -> {
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return new LLOAD(codeStream);
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}
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case Const.FLOAD -> {
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return new FLOAD(codeStream);
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}
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case Const.DLOAD -> {
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return new DLOAD(codeStream);
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}
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case Const.ALOAD -> {
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return new ALOAD(codeStream);
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}
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case Const.ILOAD_0 -> {
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return new ILOAD_0(codeStream);
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}
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case Const.ILOAD_1 -> {
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return new ILOAD_1(codeStream);
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}
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case Const.ILOAD_2 -> {
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return new ILOAD_2(codeStream);
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}
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case Const.ILOAD_3 -> {
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return new ILOAD_3(codeStream);
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}
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case Const.LLOAD_0 -> {
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return new LLOAD_0(codeStream);
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}
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case Const.LLOAD_1 -> {
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return new LLOAD_1(codeStream);
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}
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case Const.LLOAD_2 -> {
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return new LLOAD_2(codeStream);
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}
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case Const.LLOAD_3 -> {
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return new LLOAD_3(codeStream);
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}
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case Const.FLOAD_0 -> {
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return new FLOAD_0(codeStream);
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}
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case Const.FLOAD_1 -> {
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return new FLOAD_1(codeStream);
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}
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case Const.FLOAD_2 -> {
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return new FLOAD_2(codeStream);
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}
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case Const.FLOAD_3 -> {
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return new FLOAD_3(codeStream);
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}
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case Const.DLOAD_0 -> {
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return new DLOAD_0(codeStream);
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}
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case Const.DLOAD_1 -> {
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return new DLOAD_1(codeStream);
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}
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case Const.DLOAD_2 -> {
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return new DLOAD_2(codeStream);
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}
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case Const.DLOAD_3 -> {
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return new DLOAD_3(codeStream);
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}
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case Const.ALOAD_0 -> {
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return new ALOAD_0(codeStream);
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}
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case Const.ALOAD_1 -> {
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return new ALOAD_1(codeStream);
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}
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case Const.ALOAD_2 -> {
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return new ALOAD_2(codeStream);
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}
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case Const.ALOAD_3 -> {
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return new ALOAD_3(codeStream);
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}
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case Const.IALOAD -> {
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return new IALOAD(codeStream);
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}
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case Const.LALOAD -> {
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return new LALOAD(codeStream);
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}
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case Const.FALOAD -> {
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return new FALOAD(codeStream);
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}
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case Const.DALOAD -> {
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return new DALOAD(codeStream);
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}
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case Const.AALOAD -> {
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return new AALOAD(codeStream);
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}
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case Const.BALOAD -> {
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return new BALOAD(codeStream);
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}
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case Const.CALOAD -> {
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return new CALOAD(codeStream);
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}
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case Const.SALOAD -> {
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return new SALOAD(codeStream);
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}
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case Const.ISTORE -> {
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return new ISTORE(codeStream);
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}
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case Const.LSTORE -> {
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return new LSTORE(codeStream);
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}
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case Const.FSTORE -> {
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return new FSTORE(codeStream);
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}
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case Const.DSTORE -> {
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return new DSTORE(codeStream);
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}
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case Const.ASTORE -> {
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return new ASTORE(codeStream);
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}
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case Const.ISTORE_0 -> {
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return new ISTORE_0(codeStream);
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}
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case Const.ISTORE_1 -> {
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return new ISTORE_1(codeStream);
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}
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case Const.ISTORE_2 -> {
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return new ISTORE_2(codeStream);
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}
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case Const.ISTORE_3 -> {
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return new ISTORE_3(codeStream);
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}
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case Const.LSTORE_0 -> {
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return new LSTORE_0(codeStream);
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}
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case Const.LSTORE_1 -> {
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return new LSTORE_1(codeStream);
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}
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case Const.LSTORE_2 -> {
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return new LSTORE_2(codeStream);
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}
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case Const.LSTORE_3 -> {
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return new LSTORE_3(codeStream);
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}
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case Const.FSTORE_0 -> {
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return new FSTORE_0(codeStream);
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}
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case Const.FSTORE_1 -> {
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return new FSTORE_1(codeStream);
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}
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case Const.FSTORE_2 -> {
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return new FSTORE_2(codeStream);
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}
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case Const.FSTORE_3 -> {
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return new FSTORE_3(codeStream);
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}
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case Const.DSTORE_0 -> {
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return new DSTORE_0(codeStream);
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}
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case Const.DSTORE_1 -> {
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return new DSTORE_1(codeStream);
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}
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case Const.DSTORE_2 -> {
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return new DSTORE_2(codeStream);
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}
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case Const.DSTORE_3 -> {
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return new DSTORE_3(codeStream);
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}
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case Const.ASTORE_0 -> {
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return new ASTORE_0(codeStream);
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}
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case Const.ASTORE_1 -> {
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return new ASTORE_1(codeStream);
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}
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case Const.ASTORE_2 -> {
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return new ASTORE_2(codeStream);
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}
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case Const.ASTORE_3 -> {
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return new ASTORE_3(codeStream);
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}
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case Const.IASTORE -> {
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return new IASTORE(codeStream);
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}
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case Const.LASTORE -> {
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return new LASTORE(codeStream);
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}
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case Const.FASTORE -> {
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return new FASTORE(codeStream);
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}
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case Const.DASTORE -> {
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return new DASTORE(codeStream);
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}
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case Const.AASTORE -> {
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return new AASTORE(codeStream);
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}
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case Const.BASTORE -> {
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return new BASTORE(codeStream);
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}
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case Const.CASTORE -> {
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return new CASTORE(codeStream);
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}
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case Const.SASTORE -> {
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return new SASTORE(codeStream);
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}
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case Const.POP -> {
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return new POP(codeStream);
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}
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case Const.POP2 -> {
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return new POP2(codeStream);
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}
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case Const.DUP -> {
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return new DUP(codeStream);
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}
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case Const.DUP_X1 -> {
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return new DUP_X1(codeStream);
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}
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case Const.DUP_X2 -> {
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return new DUP_X2(codeStream);
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}
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case Const.DUP2 -> {
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return new DUP2(codeStream);
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}
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case Const.DUP2_X1 -> {
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return new DUP2_X1(codeStream);
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}
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case Const.DUP2_X2 -> {
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return new DUP2_X2(codeStream);
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}
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case Const.SWAP -> {
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return new SWAP(codeStream);
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}
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case Const.IADD -> {
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return new IADD(codeStream);
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}
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case Const.LADD -> {
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return new LADD(codeStream);
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}
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case Const.FADD -> {
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return new FADD(codeStream);
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}
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case Const.DADD -> {
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return new DADD(codeStream);
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}
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case Const.ISUB -> {
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return new ISUB(codeStream);
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}
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case Const.LSUB -> {
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return new LSUB(codeStream);
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}
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case Const.FSUB -> {
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return new FSUB(codeStream);
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}
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case Const.DSUB -> {
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return new DSUB(codeStream);
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}
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case Const.IMUL -> {
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return new IMUL(codeStream);
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}
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case Const.LMUL -> {
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return new LMUL(codeStream);
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}
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case Const.FMUL -> {
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return new FMUL(codeStream);
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}
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case Const.DMUL -> {
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return new DMUL(codeStream);
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}
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case Const.IDIV -> {
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return new IDIV(codeStream);
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}
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case Const.LDIV -> {
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return new LDIV(codeStream);
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}
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case Const.FDIV -> {
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return new FDIV(codeStream);
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}
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case Const.DDIV -> {
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return new DDIV(codeStream);
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}
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case Const.IREM -> {
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return new IREM(codeStream);
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}
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case Const.LREM -> {
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return new LREM(codeStream);
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}
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case Const.FREM -> {
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return new FREM(codeStream);
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}
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case Const.DREM -> {
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return new DREM(codeStream);
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}
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case Const.INEG -> {
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return new INEG(codeStream);
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}
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case Const.LNEG -> {
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return new LNEG(codeStream);
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}
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case Const.FNEG -> {
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return new FNEG(codeStream);
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}
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case Const.DNEG -> {
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return new DNEG(codeStream);
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}
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case Const.ISHL -> {
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return new ISHL(codeStream);
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}
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case Const.LSHL -> {
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return new LSHL(codeStream);
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}
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case Const.ISHR -> {
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return new ISHR(codeStream);
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}
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case Const.LSHR -> {
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return new LSHR(codeStream);
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}
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case Const.IUSHR -> {
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return new IUSHR(codeStream);
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}
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case Const.LUSHR -> {
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return new LUSHR(codeStream);
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}
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case Const.IAND -> {
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return new IAND(codeStream);
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}
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case Const.LAND -> {
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return new LAND(codeStream);
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}
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case Const.IOR -> {
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return new IOR(codeStream);
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}
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case Const.LOR -> {
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return new LOR(codeStream);
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}
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case Const.IXOR -> {
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return new IXOR(codeStream);
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}
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case Const.LXOR -> {
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return new LXOR(codeStream);
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}
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case Const.IINC -> {
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return new IINC(codeStream);
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}
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case Const.I2L -> {
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return new I2L(codeStream);
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}
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case Const.I2F -> {
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return new I2F(codeStream);
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}
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case Const.I2D -> {
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return new I2D(codeStream);
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}
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case Const.L2I -> {
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return new L2I(codeStream);
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}
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case Const.L2F -> {
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||
return new L2F(codeStream);
|
||
}
|
||
case Const.L2D -> {
|
||
return new L2D(codeStream);
|
||
}
|
||
case Const.F2I -> {
|
||
return new F2I(codeStream);
|
||
}
|
||
case Const.F2L -> {
|
||
return new F2L(codeStream);
|
||
}
|
||
case Const.F2D -> {
|
||
return new F2D(codeStream);
|
||
}
|
||
case Const.D2I -> {
|
||
return new D2I(codeStream);
|
||
}
|
||
case Const.D2L -> {
|
||
return new D2L(codeStream);
|
||
}
|
||
case Const.D2F -> {
|
||
return new D2F(codeStream);
|
||
}
|
||
case Const.I2B -> {
|
||
return new I2B(codeStream);
|
||
}
|
||
case Const.I2C -> {
|
||
return new I2C(codeStream);
|
||
}
|
||
case Const.I2S -> {
|
||
return new I2S(codeStream);
|
||
}
|
||
case Const.LCMP -> {
|
||
return new LCMP(codeStream);
|
||
}
|
||
case Const.FCMPL -> {
|
||
return new FCMPL(codeStream);
|
||
}
|
||
case Const.FCMPG -> {
|
||
return new FCMPG(codeStream);
|
||
}
|
||
case Const.DCMPL -> {
|
||
return new DCMPL(codeStream);
|
||
}
|
||
case Const.DCMPG -> {
|
||
return new DCMPG(codeStream);
|
||
}
|
||
case Const.IFEQ -> {
|
||
return new IFEQ(codeStream);
|
||
}
|
||
case Const.IFNE -> {
|
||
return new IFNE(codeStream);
|
||
}
|
||
case Const.IFLT -> {
|
||
return new IFLT(codeStream);
|
||
}
|
||
case Const.IFGE -> {
|
||
return new IFGE(codeStream);
|
||
}
|
||
case Const.IFGT -> {
|
||
return new IFGT(codeStream);
|
||
}
|
||
case Const.IFLE -> {
|
||
return new IFLE(codeStream);
|
||
}
|
||
case Const.IF_ICMPEQ -> {
|
||
return new IF_ICMPEQ(codeStream);
|
||
}
|
||
case Const.IF_ICMPNE -> {
|
||
return new IF_ICMPNE(codeStream);
|
||
}
|
||
case Const.IF_ICMPLT -> {
|
||
return new IF_ICMPLT(codeStream);
|
||
}
|
||
case Const.IF_ICMPGE -> {
|
||
return new IF_ICMPGE(codeStream);
|
||
}
|
||
case Const.IF_ICMPGT -> {
|
||
return new IF_ICMPGT(codeStream);
|
||
}
|
||
case Const.IF_ICMPLE -> {
|
||
return new IF_ICMPLE(codeStream);
|
||
}
|
||
case Const.IF_ACMPEQ -> {
|
||
return new IF_ACMPEQ(codeStream);
|
||
}
|
||
case Const.IF_ACMPNE -> {
|
||
return new IF_ACMPNE(codeStream);
|
||
}
|
||
case Const.GOTO -> {
|
||
return new GOTO(codeStream);
|
||
}
|
||
case Const.JSR -> {
|
||
return new JSR(codeStream);
|
||
}
|
||
case Const.RET -> {
|
||
return new RET(codeStream);
|
||
}
|
||
case Const.TABLESWITCH -> {
|
||
throw new Error("Not support JavaVM opcode TABLESWITCH");
|
||
}
|
||
case Const.LOOKUPSWITCH -> {
|
||
throw new Error("Not support JavaVM opcode LOOKUPSWITCH");
|
||
}
|
||
case Const.IRETURN -> {
|
||
return new IRETURN(codeStream);
|
||
}
|
||
case Const.LRETURN -> {
|
||
return new LRETURN(codeStream);
|
||
}
|
||
case Const.FRETURN -> {
|
||
return new FRETURN(codeStream);
|
||
}
|
||
case Const.DRETURN -> {
|
||
return new DRETURN(codeStream);
|
||
}
|
||
case Const.ARETURN -> {
|
||
return new ARETURN(codeStream);
|
||
}
|
||
case Const.RETURN -> {
|
||
return new RETURN(codeStream);
|
||
}
|
||
case Const.GETSTATIC -> {
|
||
return new GETSTATIC(codeStream);
|
||
}
|
||
case Const.PUTSTATIC -> {
|
||
return new PUTSTATIC(codeStream);
|
||
}
|
||
case Const.GETFIELD -> {
|
||
return new GETFIELD(codeStream);
|
||
}
|
||
case Const.PUTFIELD -> {
|
||
return new PUTFIELD(codeStream);
|
||
}
|
||
case Const.INVOKEVIRTUAL -> {
|
||
return new INVOKEVIRTUAL(codeStream);
|
||
}
|
||
case Const.INVOKESPECIAL -> {
|
||
return new INVOKESPECIAL(codeStream);
|
||
}
|
||
case Const.INVOKESTATIC -> {
|
||
return new INVOKESTATIC(codeStream);
|
||
}
|
||
case Const.INVOKEINTERFACE -> {
|
||
throw new Error("Not support JavaVM opcode INVOKEINTERFACE");
|
||
}
|
||
case Const.INVOKEDYNAMIC -> {
|
||
throw new Error("Not support JavaVM opcode INVOKEDYNAMIC");
|
||
}
|
||
case Const.NEW -> {
|
||
return new NEW(codeStream);
|
||
}
|
||
case Const.NEWARRAY -> {
|
||
return new NEWARRAY(codeStream);
|
||
}
|
||
case Const.ANEWARRAY -> {
|
||
return new ANEWARRAY(codeStream);
|
||
}
|
||
case Const.ARRAYLENGTH -> {
|
||
return new ARRAYLENGTH(codeStream);
|
||
}
|
||
case Const.ATHROW -> {
|
||
throw new Error("Not support JavaVM opcode ATHROW");
|
||
}
|
||
case Const.CHECKCAST -> {
|
||
return new CHECKCAST(codeStream);
|
||
}
|
||
case Const.INSTANCEOF -> {
|
||
return new INSTANCEOF(codeStream);
|
||
}
|
||
case Const.MONITORENTER -> {
|
||
throw new Error("Not support JavaVM opcode MONITORENTER");
|
||
}
|
||
case Const.MONITOREXIT -> {
|
||
throw new Error("Not support JavaVM opcode MONITOREXIT");
|
||
}
|
||
case Const.WIDE -> {
|
||
throw new Error("Not support JavaVM opcode WIDE");
|
||
}
|
||
case Const.MULTIANEWARRAY -> {
|
||
throw new Error("Not support JavaVM opcode MULTIANEWARRAY");
|
||
}
|
||
case Const.IFNULL -> {
|
||
return new IFNULL(codeStream);
|
||
}
|
||
case Const.IFNONNULL -> {
|
||
return new IFNONNULL(codeStream);
|
||
}
|
||
case Const.GOTO_W -> {
|
||
return new GOTO_W(codeStream);
|
||
}
|
||
case Const.JSR_W -> {
|
||
return new JSR_W(codeStream);
|
||
}
|
||
default -> throw new Error("Unknown JavaVM opcode " + opcode);
|
||
}
|
||
}
|
||
|
||
}
|
||
```
|
||
|
||
# 联系作者
|
||
微信账号: haidnor (请备注 "JVM")
|
||
 |