案例介绍
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、<t>aload、<t>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<t>aload和<t>astore系列指令按索引存取。其中<t>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
2.1、配置位置：Run/Debug Configurations -> program arguments
2.2、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
2.2、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
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); } }
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); } }
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; } }
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; } }
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()); } }
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(); } }
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); } } }
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); } } }
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
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}]