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用Java实现JVM第八章《数组和字符串》

本章主要介绍如何实现让虚拟机处理数组和字符串，在虚拟机功能增强后，我们可以执行数组类型计算和输出字符串。本章需要新增实现数组指令；newarray、anewarray、arraylength、aload、astore、multianewarray、ldc，同时需要需要开发字符串池方法等。

数组在Java虚拟机中是给比较特殊的概念，主要有以下原因；

首先，数组类和普通的类是不同的。普通的类从class文件中加载，但是数组类由Java虚拟机在运行时生成。数组的类名是左括号([)+数组元素的类型描述符；数组的类型描述符就是类名本身。例如，int[]的类名是[I，int[][]的类名是[[I，Object[]的类名是[Ljava/lang/Object;，String[][]的类名是[[java/lang/String;，等等。

其次，创建数组的方式和创建普通对象的方式不同。普通对象new指令创建，然后由构造函数初始化。基本类型数组由newarray指令创建；引用类型数组由anewarray指令创建；另外还有一个专门的mulitianewarray指令用于创建多维数组。

最后，很显然，数组和普通对象存在的数据也是不同的。普通对象中存放的是实例变量，通过putfield和getfield指令存取。数组对象中存放的则是数组元素，通过aload和astore系列指令按索引存取。其中可以是a、b、c、d、f、i、l或者s，分别用于存取引用、byte、char、double、float、int、long或者shore类型的数组。另外，还有一个arraylength指令，用于获取数组长度。

环境准备

  1. jdk 1.8.0
  2. IntelliJ IDEA Community Edition 2018.3.1 x64

配置信息

  1. 调试配置
    1. 配置位置：Run/Debug Configurations -> program arguments
    2. 配置内容（执行数组计算）：-Xjre "C:/Program Files/Java/jdk1.8.0_161/jre" E:/itstack/git/istack-demo/itstack-demo-jvm/itstack-demo-jvm-08/target/test-classes/org/itstack/demo/test/BubbleSortTest
    3. 配置内容（字符串的输出）：-Xjre "C:/Program Files/Java/jdk1.8.0_161/jre" E:/itstack/git/istack-demo/itstack-demo-jvm/itstack-demo-jvm-08/target/test-classes/org/itstack/demo/test/HelloWorld -verbose true -args 你好，java版虚拟机v1.0，欢迎你的到来。

代码示例

itstack-demo-jvm-08
├── pom.xml
└── src
    └── main
    │    └── java
    │        └── org.itstack.demo.jvm
    │             ├── classfile
    │             │   ├── attributes   {BootstrapMethods/Code/ConstantValue...}
    │             │   ├── constantpool {CONSTANT_TAG_CLASS/CONSTANT_TAG_FIELDREF/CONSTANT_TAG_METHODREF...}
    │             │   ├── ClassFile.java
    │             │   ├── ClassReader.java
    │             │   └── MemberInfo.java   
    │             ├── classpath
    │             │   ├── impl
    │             │   │   ├── CompositeEntry.java
    │             │   │   ├── DirEntry.java 
    │             │   │   ├── WildcardEntry.java 
    │             │   │   └── ZipEntry.java    
    │             │   ├── Classpath.java
    │             │   └── Entry.java   
    │             ├── classpath
    │             │   ├── base
    │             │   │   ├── BytecodeReader.java
    │             │   │   ├── ClassInitLogic.java
    │             │   │   ├── Instruction.java
    │             │   │   ├── InstructionBranch.java
    │             │   │   ├── InstructionIndex8.java
    │             │   │   ├── InstructionIndex16.java
    │             │   │   ├── InstructionNoOperands.java	
    │             │   │   └── MethodInvokeLogic.java
    │             │   ├── comparisons
    │             │   ├── constants
    │             │   ├── control
    │             │   ├── conversions
    │             │   ├── extended
    │             │   ├── loads
    │             │   ├── math
    │             │   ├── references
    │             │   │   ├── ANEW_ARRAY.java
    │             │   │   ├── ARRAY_LENGTH.java
    │             │   │   ├── CHECK_CAST.java
    │             │   │   ├── GET_FIELD.java
    │             │   │   ├── GET_STATIC.java
    │             │   │   ├── INSTANCE_OF.java
    │             │   │   ├── INVOKE_INTERFACE.java
    │             │   │   ├── INVOKE_SPECIAL.java
    │             │   │   ├── INVOKE_STATIC.java
    │             │   │   ├── INVOKE_VIRTUAL.java
    │             │   │   ├── MULTI_ANEW_ARRAY.java
    │             │   │   ├── NEW.java
    │             │   │   ├── NEW_ARRAY.java
    │             │   │   ├── PUT_FIELD.java
    │             │   │   └── PUT_STATIC.java
    │             │   ├── stack
    │             │   ├── store
    │             │   │   └── xastore
    │             │   │       ├── AASTORE.java	
    │             │   │       ├── BASTORE.java	
    │             │   │       ├── CASTORE.java	
    │             │   │       ├── DASTORE.java
    │             │   │       ├── FASTORE.java
    │             │   │       ├── IASTORE.java
    │             │   │       ├── LASTORE.java	
    │             │   │       └── SASTORE.java		
    │             │   └── Factory   
    │             ├── rtda
    │             │   ├── heap
    │             │   │   ├── constantpool
    │             │   │   ├── methodarea
    │             │   │   │   ├── Class.java    
    │             │   │   │   ├── ClassMember.java  
    │             │   │   │   ├── Field.java    
    │             │   │   │   ├── Method.java 
    │             │   │   │   ├── MethodDescriptor.java 
    │             │   │   │   ├── MethodDescriptorParser.java 
    │             │   │   │   ├── MethodLookup.java 	
    │             │   │   │   ├── Object.java   
    │             │   │   │   ├── Slots.java   
    │             │   │   │   └── StringPool.java	
    │             │   │   └── ClassLoader.java  
    │             │   ├── Frame.java
    │             │   ├── JvmStack.java
    │             │   ├── LocalVars.java
    │             │   ├── OperandStack.java
    │             │   ├── Slot.java 
    │             │   └── Thread.java
    │             ├── Cmd.java
    │             ├── Interpret.java    
    │             └── Main.java
    └── test
         └── java
             └── org.itstack.demo.test
			     ├── BubbleSortTest.java
                 └── HelloWorld.java
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代码片段

ANEW_ARRAY.java

package org.itstack.demo.jvm.instructions.references;

import org.itstack.demo.jvm.instructions.base.InstructionIndex16;
import org.itstack.demo.jvm.rtda.Frame;
import org.itstack.demo.jvm.rtda.OperandStack;
import org.itstack.demo.jvm.rtda.heap.constantpool.ClassRef;
import org.itstack.demo.jvm.rtda.heap.constantpool.RunTimeConstantPool;
import org.itstack.demo.jvm.rtda.heap.methodarea.Class;
import org.itstack.demo.jvm.rtda.heap.methodarea.Object;

/**
 * http://www.itstack.org
 * create by fuzhengwei on 2019/4/29
 * create new array of reference
 */
public class ANEW_ARRAY extends InstructionIndex16 {

    @Override
    public void execute(Frame frame) {
        
        RunTimeConstantPool runTimeConstantPool = frame.method().clazz().constantPool();
        ClassRef classRef = (ClassRef) runTimeConstantPool.getConstants(this.idx);
        Class componentClass = classRef.resolvedClass();

        OperandStack stack = frame.operandStack();
        int count = stack.popInt();
        if (count < 0) {
            throw new NegativeArraySizeException();
        }

        Class arrClass = componentClass.arrayClass();
        Object arr = arrClass.newArray(count);
        stack.pushRef(arr);

    }

}
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ARRAY_LENGTH.java

package org.itstack.demo.jvm.instructions.references;

import org.itstack.demo.jvm.instructions.base.InstructionNoOperands;
import org.itstack.demo.jvm.rtda.Frame;
import org.itstack.demo.jvm.rtda.OperandStack;
import org.itstack.demo.jvm.rtda.heap.methodarea.Object;

/**
 * http://www.itstack.org
 * create by fuzhengwei on 2019/4/29
 * get length of array
 */
public class ARRAY_LENGTH extends InstructionNoOperands {

    @Override
    public void execute(Frame frame) {

        OperandStack stack = frame.operandStack();
        Object arrRef = stack.popRef();
        if (null == arrRef){
            throw new NullPointerException();
        }

        int arrLen = arrRef.arrayLength();
        stack.pushInt(arrLen);
    }

}
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NEW_ARRAY.java

package org.itstack.demo.jvm.instructions.references;

import org.itstack.demo.jvm.instructions.base.BytecodeReader;
import org.itstack.demo.jvm.instructions.base.Instruction;
import org.itstack.demo.jvm.rtda.Frame;
import org.itstack.demo.jvm.rtda.OperandStack;
import org.itstack.demo.jvm.rtda.heap.ClassLoader;
import org.itstack.demo.jvm.rtda.heap.methodarea.Class;
import org.itstack.demo.jvm.rtda.heap.methodarea.Object;

/**
 * http://www.itstack.org
 * create by fuzhengwei on 2019/4/29
 */
public class NEW_ARRAY implements Instruction {

    private byte atype;

    @Override
    public void fetchOperands(BytecodeReader reader) {
        this.atype = reader.readByte();
    }

    @Override
    public void execute(Frame frame) {
        OperandStack stack = frame.operandStack();
        int count = stack.popInt();
        if (count < 0) {
            throw new NegativeArraySizeException();
        }

        ClassLoader classLoader = frame.method().clazz().loader();
        Class arrClass = getPrimitiveArrayClass(classLoader, this.atype);
        Object arr = arrClass.newArray(count);
        stack.pushRef(arr);

    }

    private Class getPrimitiveArrayClass(ClassLoader loader, byte atype){
        switch (atype) {
            case ArrayType.AT_BOOLEAN:
                return loader.loadClass("[Z");
            case ArrayType.AT_BYTE:
                return loader.loadClass("[B");
            case ArrayType.AT_CHAR:
                return loader.loadClass("[C");
            case ArrayType.AT_SHORT:
                return loader.loadClass("[S");
            case ArrayType.AT_INT:
                return loader.loadClass("[I");
            case ArrayType.AT_LONG:
                return loader.loadClass("[J");
            case ArrayType.AT_FLOAT:
                return loader.loadClass("[F");
            case ArrayType.AT_DOUBLE:
                return loader.loadClass("[D");
            default:
                throw new RuntimeException("Invalid atype!");
        }
    }

    static class ArrayType {
        static final byte AT_BOOLEAN = 4;
        static final byte AT_CHAR = 5;
        static final byte AT_FLOAT = 6;
        static final byte AT_DOUBLE = 7;
        static final byte AT_BYTE = 8;
        static final byte AT_SHORT = 9;
        static final byte AT_INT = 10;
        static final byte AT_LONG = 11;
    }

}
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IASTORE.java

package org.itstack.demo.jvm.instructions.stores.xastore;

import org.itstack.demo.jvm.instructions.base.InstructionNoOperands;
import org.itstack.demo.jvm.rtda.Frame;
import org.itstack.demo.jvm.rtda.OperandStack;
import org.itstack.demo.jvm.rtda.heap.methodarea.Object;

/**
 * http://www.itstack.org
 * create by fuzhengwei on 2019/4/29
 */
public class IASTORE extends InstructionNoOperands {

    @Override
    public void execute(Frame frame) {
        OperandStack stack = frame.operandStack();
        int val = stack.popInt();
        int idx = stack.popInt();
        Object arrRef = stack.popRef();

        checkNotNull(arrRef);
        int[] ints = arrRef.ints();
        checkIndex(ints.length, idx);
        ints[idx] = val;

    }

}
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StringPool.java

package org.itstack.demo.jvm.rtda.heap.methodarea;

import org.itstack.demo.jvm.rtda.heap.ClassLoader;

import java.util.HashMap;
import java.util.Map;

/**
 * http://www.itstack.org
 * create by fuzhengwei on 2019/4/29
 */
public class StringPool {

    private static Map<String, Object> internedStrs = new HashMap<>();

    public static Object jString(ClassLoader loader, String goStr) {
        Object internedStr = internedStrs.get(goStr);
        if (null != internedStr) return internedStr;

        char[] chars = goStr.toCharArray();
        Object jChars = new Object(loader.loadClass("[C"), chars);
        
        Object jStr = loader.loadClass("java/lang/String").newObject();
        jStr.setRefVal("value", "[C", jChars);

        internedStrs.put(goStr, jStr);
        return jStr;
    }

    public static String goString(Object jStr) {
        Object charArr = jStr.getRefVar("value", "[C");
        return new String(charArr.chars());
    }

}
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Interpret.java

package org.itstack.demo.jvm;

import com.alibaba.fastjson.JSON;
import org.itstack.demo.jvm.instructions.Factory;
import org.itstack.demo.jvm.instructions.base.BytecodeReader;
import org.itstack.demo.jvm.instructions.base.Instruction;
import org.itstack.demo.jvm.rtda.Frame;
import org.itstack.demo.jvm.rtda.Thread;
import org.itstack.demo.jvm.rtda.heap.ClassLoader;
import org.itstack.demo.jvm.rtda.heap.methodarea.*;
import org.itstack.demo.jvm.rtda.heap.methodarea.Class;
import org.itstack.demo.jvm.rtda.heap.methodarea.Object;


//指令集解释器
class Interpret {

    Interpret(Method method, boolean logInst, String args) {
        Thread thread = new Thread();
        Frame frame = thread.newFrame(method);
        thread.pushFrame(frame);

        if (null != args){
            Object jArgs = createArgsArray(method.clazz().loader(), args.split(" "));
            frame.localVars().setRef(0, jArgs);
        }

        loop(thread, logInst);
    }

    private Object createArgsArray(ClassLoader loader, String[] args) {
        Class stringClass = loader.loadClass("java/lang/String");
        Object argsArr = stringClass.arrayClass().newArray(args.length);
        Object[] jArgs = argsArr.refs();
        for (int i = 0; i < jArgs.length; i++) {
            jArgs[i] = StringPool.jString(loader, args[i]);
        }
        return argsArr;
    }

    private void loop(Thread thread, boolean logInst) {
        BytecodeReader reader = new BytecodeReader();
        while (true) {
            Frame frame = thread.currentFrame();
            int pc = frame.nextPC();
            thread.setPC(pc);

            reader.reset(frame.method().code, pc);
            byte opcode = reader.readByte();
            Instruction inst = Factory.newInstruction(opcode);
            if (null == inst) {
                System.out.println("Unsupported opcode " + byteToHexString(new byte[]{opcode}));
                break;
            }
            inst.fetchOperands(reader);
            frame.setNextPC(reader.pc());

            if (logInst) {
                logInstruction(frame, inst, opcode);
            }

            //exec
            inst.execute(frame);

            if (thread.isStackEmpty()) {
                break;
            }
        }
    }

    private static void logInstruction(Frame frame, Instruction inst, byte opcode) {
        Method method = frame.method();
        String className = method.clazz().name();
        String methodName = method.name();
        String outStr = (className + "." + methodName + "() /t") +
                "寄存器(指令)：" + byteToHexString(new byte[]{opcode}) + " -> " + inst.getClass().getSimpleName() + " => 局部变量表：" + JSON.toJSONString(frame.operandStack().getSlots()) + " 操作数栈：" + JSON.toJSONString(frame.operandStack().getSlots());
        System.out.println(outStr);
    }

    private static String byteToHexString(byte[] codes) {
        StringBuilder sb = new StringBuilder();
        sb.append("0x");
        for (byte b : codes) {
            int value = b & 0xFF;
            String strHex = Integer.toHexString(value);
            if (strHex.length() < 2) {
                strHex = "0" + strHex;
            }
            sb.append(strHex);
        }
        return sb.toString();
    }

}
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BubbleSortTest.java

package org.itstack.demo.test;

/**
 * -Xjre "C:/Program Files/Java/jdk1.8.0_161/jre" E:/itstack/git/istack-demo/itstack-demo-jvm/itstack-demo-jvm-08/target/test-classes/org/itstack/demo/test/BubbleSortTest -verbose true
 */
public class BubbleSortTest {
    
    public static void main(String[] args) {
        int[] arr = {
            22, 84, 77, 11, 95,  9, 78, 56, 
            36, 97, 65, 36, 10, 24 ,92, 48
        };

        //printArray(arr);
        bubbleSort(arr);
        //System.out.println(123456789);
        printArray(arr);
    }
    
    private static void bubbleSort(int[] arr) {
        boolean swapped = true;
        int j = 0;
        int tmp;
        while (swapped) {
            swapped = false;
            j++;
            for (int i = 0; i < arr.length - j; i++) {
                if (arr[i] > arr[i + 1]) {
                    tmp = arr[i];
                    arr[i] = arr[i + 1];
                    arr[i + 1] = tmp;
                    swapped = true;
                }
            }
        }
    }
    
    private static void printArray(int[] arr) {
        for (int i : arr) {
            System.out.println(i);
        }
    }
    
}
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HelloWorld.java

package org.itstack.demo.test;

/**
 * -Xjre "C:/Program Files/Java/jdk1.8.0_161/jre" E:/itstack/git/istack-demo/itstack-demo-jvm/itstack-demo-jvm-08/target/test-classes/org/itstack/demo/test/HelloWorld -verbose true -args 你好，java版虚拟机v1.0，欢迎你的到来。
 */
public class HelloWorld {

    public static void main(String[] args) {
        for (String str : args) {
            System.out.println(str);
        }
    }

}
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测试结果一；执行数组

-Xjre "C:/Program Files/Java/jdk1.8.0_161/jre" E:/itstack/git/istack-demo/itstack-demo-jvm/itstack-demo-jvm-08/target/test-classes/org/itstack/demo/test/BubbleSortTest -verbose true
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":0},{"num":0},{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0},{"num":0},{"num":0}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0xbc -> NEW_ARRAY => 局部变量表：[{"num":16},{"num":0},{"num":0},{"num":0}] 操作数栈：[{"num":16},{"num":0},{"num":0},{"num":0}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":0},{"num":0},{"num":0}] 操作数栈：[{"num":16,"ref":{}},{"num":0},{"num":0},{"num":0}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x03 -> ICONST_0 => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":0},{"num":22}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":0},{"num":22}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x04 -> ICONST_1 => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":22}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":22}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":1},{"num":84}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":1},{"num":84}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x05 -> ICONST_2 => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":84}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":84}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":2},{"num":77}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":2},{"num":77}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x06 -> ICONST_3 => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":77}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":77}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":3},{"num":11}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":3},{"num":11}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x07 -> ICONST_4 => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":11}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":11}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":4},{"num":95}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":4},{"num":95}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x08 -> ICONST_5 => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":95}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":95}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":5},{"num":9}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":5},{"num":9}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":9}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":9}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":6},{"num":78}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":6},{"num":78}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":78}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":78}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":7},{"num":56}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":7},{"num":56}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":56}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":56}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":8},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":8},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":9},{"num":97}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":9},{"num":97}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":97}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":97}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":10},{"num":65}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":10},{"num":65}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":65}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":65}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":11},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":11},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":36}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":36}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":12},{"num":10}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":12},{"num":10}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":10}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":10}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":13},{"num":24}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":13},{"num":24}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":24}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":24}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x59 -> DUP => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":14},{"num":92}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":14},{"num":92}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x10 -> BIPUSH => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":92}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":92}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4f -> IASTORE => 局部变量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":48}] 操作数栈：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":48}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x4c -> ASTORE_1 => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0x2b -> ALOAD_1 => 局部变量表：[{"num":16},{"num":16},{"num":15},{"num":48}] 操作数栈：[{"num":16},{"num":16},{"num":15},{"num":48}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0xb8 -> INVOKE_STATIC => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}]
java/lang/Object.<clinit>() 	寄存器(指令)：0xb8 -> INVOKE_STATIC => 局部变量表：null 操作数栈：null
java/lang/Object.<clinit>() 	寄存器(指令)：0xb1 -> RETURN => 局部变量表：null 操作数栈：null
... ...
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xb2 -> GET_STATIC => 局部变量表：[{"num":9},{"num":0}] 操作数栈：[{"num":9},{"num":0}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x15 -> ILOAD => 局部变量表：[{"num":9},{"num":0}] 操作数栈：[{"num":9},{"num":0}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xb6 -> INVOKE_VIRTUAL => 局部变量表：[{"num":9},{"num":9}] 操作数栈：[{"num":9},{"num":9}]
9
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x84 -> IINC => 局部变量表：[{"num":9},{"num":9}] 操作数栈：[{"num":9},{"num":9}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xa7 -> GOTO => 局部变量表：[{"num":9},{"num":9}] 操作数栈：[{"num":9},{"num":9}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x1d -> ILOAD_3 => 局部变量表：[{"num":9},{"num":9}] 操作数栈：[{"num":9},{"num":9}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x1c -> ILOAD_2 => 局部变量表：[{"num":1},{"num":9}] 操作数栈：[{"num":1},{"num":9}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xa2 -> IF_ICMPGE => 局部变量表：[{"num":1},{"num":16}] 操作数栈：[{"num":1},{"num":16}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x2b -> ALOAD_1 => 局部变量表：[{"num":1},{"num":16}] 操作数栈：[{"num":1},{"num":16}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x1d -> ILOAD_3 => 局部变量表：[{"num":1,"ref":{}},{"num":16}] 操作数栈：[{"num":1,"ref":{}},{"num":16}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x2e -> IALOAD => 局部变量表：[{"num":1,"ref":{}},{"num":1}] 操作数栈：[{"num":1,"ref":{}},{"num":1}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x36 -> ISTORE => 局部变量表：[{"num":10},{"num":1}] 操作数栈：[{"num":10},{"num":1}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xb2 -> GET_STATIC => 局部变量表：[{"num":10},{"num":1}] 操作数栈：[{"num":10},{"num":1}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x15 -> ILOAD => 局部变量表：[{"num":10},{"num":1}] 操作数栈：[{"num":10},{"num":1}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xb6 -> INVOKE_VIRTUAL => 局部变量表：[{"num":10},{"num":10}] 操作数栈：[{"num":10},{"num":10}]
10
11
22
24
36
36
48
56
65
77
78
84
92
95
97
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x84 -> IINC => 局部变量表：[{"num":97},{"num":97}] 操作数栈：[{"num":97},{"num":97}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xa7 -> GOTO => 局部变量表：[{"num":97},{"num":97}] 操作数栈：[{"num":97},{"num":97}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x1d -> ILOAD_3 => 局部变量表：[{"num":97},{"num":97}] 操作数栈：[{"num":97},{"num":97}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0x1c -> ILOAD_2 => 局部变量表：[{"num":16},{"num":97}] 操作数栈：[{"num":16},{"num":97}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xa2 -> IF_ICMPGE => 局部变量表：[{"num":16},{"num":16}] 操作数栈：[{"num":16},{"num":16}]
org/itstack/demo/test/BubbleSortTest.printArray() 	寄存器(指令)：0xb1 -> RETURN => 局部变量表：[{"num":16},{"num":16}] 操作数栈：[{"num":16},{"num":16}]
org/itstack/demo/test/BubbleSortTest.main() 	寄存器(指令)：0xb1 -> RETURN => 局部变量表：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] 操作数栈：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}]

Process finished with exit code 0

复制代码

测试结果二；输出字符

org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x2a -> ALOAD_0 => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x4c -> ASTORE_1 => 局部变量表：[{"num":0,"ref":{}},{"num":0}] 操作数栈：[{"num":0,"ref":{}},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x2b -> ALOAD_1 => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xbe -> ARRAY_LENGTH => 局部变量表：[{"num":0,"ref":{}},{"num":0}] 操作数栈：[{"num":0,"ref":{}},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x3d -> ISTORE_2 => 局部变量表：[{"num":1},{"num":0}] 操作数栈：[{"num":1},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x03 -> ICONST_0 => 局部变量表：[{"num":1},{"num":0}] 操作数栈：[{"num":1},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x3e -> ISTORE_3 => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x1d -> ILOAD_3 => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x1c -> ILOAD_2 => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xa2 -> IF_ICMPGE => 局部变量表：[{"num":0},{"num":1}] 操作数栈：[{"num":0},{"num":1}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x2b -> ALOAD_1 => 局部变量表：[{"num":0},{"num":1}] 操作数栈：[{"num":0},{"num":1}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x1d -> ILOAD_3 => 局部变量表：[{"num":0,"ref":{}},{"num":1}] 操作数栈：[{"num":0,"ref":{}},{"num":1}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x32 -> AALOAD => 局部变量表：[{"num":0,"ref":{}},{"num":0}] 操作数栈：[{"num":0,"ref":{}},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x3a -> ASTORE => 局部变量表：[{"num":0,"ref":{}},{"num":0}] 操作数栈：[{"num":0,"ref":{}},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xb2 -> GET_STATIC => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
java/lang/Object.<clinit>() 	寄存器(指令)：0xb8 -> INVOKE_STATIC => 局部变量表：null 操作数栈：null
java/lang/Object.<clinit>() 	寄存器(指令)：0xb1 -> RETURN => 局部变量表：null 操作数栈：null
java/lang/System.<clinit>() 	寄存器(指令)：0xb8 -> INVOKE_STATIC => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0x01 -> ACONST_NULL => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0xb3 -> PUT_STATIC => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0x01 -> ACONST_NULL => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0xb3 -> PUT_STATIC => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0x01 -> ACONST_NULL => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0xb3 -> PUT_STATIC => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0x01 -> ACONST_NULL => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0xb3 -> PUT_STATIC => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0x01 -> ACONST_NULL => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0xb3 -> PUT_STATIC => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
java/lang/System.<clinit>() 	寄存器(指令)：0xb1 -> RETURN => 局部变量表：[{"num":0}] 操作数栈：[{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xb2 -> GET_STATIC => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x19 -> ALOAD => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xb6 -> INVOKE_VIRTUAL => 局部变量表：[{"num":0},{"num":0,"ref":{}}] 操作数栈：[{"num":0},{"num":0,"ref":{}}]

你好，java版虚拟机v1.0，欢迎你的到来。

org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x84 -> IINC => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xa7 -> GOTO => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x1d -> ILOAD_3 => 局部变量表：[{"num":0},{"num":0}] 操作数栈：[{"num":0},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0x1c -> ILOAD_2 => 局部变量表：[{"num":1},{"num":0}] 操作数栈：[{"num":1},{"num":0}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xa2 -> IF_ICMPGE => 局部变量表：[{"num":1},{"num":1}] 操作数栈：[{"num":1},{"num":1}]
org/itstack/demo/test/HelloWorld.main() 	寄存器(指令)：0xb1 -> RETURN => 局部变量表：[{"num":1},{"num":1}] 操作数栈：[{"num":1},{"num":1}]
复制代码

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用Java实现JVM第八章《数组和字符串》
原文  https://juejin.im/post/5dedbeefe51d45580d4a9e78
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