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update README.md

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wangxiang
2023-07-30 13:05:09 +08:00
parent 2cc7e44fc2
commit a9e557831e
2 changed files with 63 additions and 6 deletions
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README.md
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@@ -54,6 +54,10 @@
```java
public class Demo5 {
static {
System.out.println("Demo5 类被加载了");
}
public static void main(String[] args) {
String str = method1("hello world");
method1(str);
@@ -71,11 +75,65 @@ public class Demo5 {
System.out.println(s);
return "你好 世界";
}
}
```
每一个 `匚` 结构图形，都表示一个 JVM 线程栈中的栈帧
![](/readme/20230721204333.png)
使用 haidnorJVM 运行以上程序将会在控制台输出以下内容。每一个 `匚` 结构图形，都表示一个 JVM 线程栈中的栈帧
```cmd
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - ┌──────────────────[1] haidnor.jvm.test.demo.Demo5 | static void <clinit>()
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 0 GETSTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 3 LDC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 5 INVOKEVIRTUAL
Demo5 类被加载了
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 8 RETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - └──────────────────[1] haidnor.jvm.test.demo.Demo5 | static void <clinit>()
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - ┌──────────────────[1] haidnor.jvm.test.demo.Demo5 | public static void main(String[] args)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 0 LDC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 2 INVOKESTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ ┌──────────────────[2] haidnor.jvm.test.demo.Demo5 | public static String method1(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ 0 ALOAD_0
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ 1 INVOKESTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ ┌──────────────────[3] haidnor.jvm.test.demo.Demo5 | public static String method2(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ 0 ALOAD_0
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ 1 INVOKESTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ ┌──────────────────[4] haidnor.jvm.test.demo.Demo5 | public static String method3(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 0 GETSTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 3 ALOAD_0
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 4 INVOKEVIRTUAL
hello world
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 7 LDC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 9 ARETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ └──────────────────[4] haidnor.jvm.test.demo.Demo5 | public static String method3(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ 4 ARETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ └──────────────────[3] haidnor.jvm.test.demo.Demo5 | public static String method2(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ 4 ARETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ └──────────────────[2] haidnor.jvm.test.demo.Demo5 | public static String method1(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 5 ASTORE_1
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 6 ALOAD_1
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 7 INVOKESTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ ┌──────────────────[2] haidnor.jvm.test.demo.Demo5 | public static String method1(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ 0 ALOAD_0
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ 1 INVOKESTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ ┌──────────────────[3] haidnor.jvm.test.demo.Demo5 | public static String method2(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ 0 ALOAD_0
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ 1 INVOKESTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ ┌──────────────────[4] haidnor.jvm.test.demo.Demo5 | public static String method3(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 0 GETSTATIC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 3 ALOAD_0
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 4 INVOKEVIRTUAL
你好 世界
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 7 LDC
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ │ 9 ARETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ └──────────────────[4] haidnor.jvm.test.demo.Demo5 | public static String method3(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ │ 4 ARETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ └──────────────────[3] haidnor.jvm.test.demo.Demo5 | public static String method2(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ │ 4 ARETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ └──────────────────[2] haidnor.jvm.test.demo.Demo5 | public static String method1(String s)
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 10 POP
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - │ 11 RETURN
[main] DEBUG haidnor.jvm.core.JavaExecutionEngine - └──────────────────[1] haidnor.jvm.test.demo.Demo5 | public static void main(String[] args)
```
### 配置 rt.jar 路径
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`

5
src/main/java/haidnor/jvm/core/JavaExecutionEngine.java
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@@ -90,10 +90,9 @@ public class JavaExecutionEngine {
while (codeStream.available() > 0) {
Instruction instruction = InstructionFactory.creatInstruction(codeStream);
instructionMap.put(instruction.index(), instruction);
log.debug("{}│> {}", blank, instruction);
// log.debug("{}│> {}", blank, instruction); // debug 输出解析字节码指令的内容
}
log.debug("{}├ - - - - - - - - -", blank);
// log.debug("{}├ - - - - - - - - -", blank);
// 执行方法中的字节码指令
// 提示: 变量 pc 相当于程序计数器, 记录当前执行到的字节码指令的"行号"