文章目录
前言
一、访问和修饰标志
二、类索引
三、父类索引
四、接口计数器
五、接口表
六、字段计数器
七、字段表
前言
上一篇博客 【Java 虚拟机原理】Class 字节码二进制文件分析 二 ( 常量池位置 | 常量池结构 | tag | info[] | 完整分析字节码文件中的常量池二进制数据 ) ;
分析到 Student.class 字节码文件的如下选中部分是常量池数据 ;
本篇博客中 , 继续向后分析 字节码对应数据 ;
分析的原始数据是 【Java 虚拟机原理】Class 字节码二进制文件分析 一 ( 字节码文件附加信息 | 魔数 | 次版本号 | 主版本号 | 常量池个数 ) 二、字节码文件示例 章节中的 Java 源码 , Class 字节码 , 字节码附加信息 ;
public class Student { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
字节码附加信息 :
D:\jvm>javap -v Student.class Classfile /D:/jvm/Student.class Last modified 2021-9-4; size 392 bytes MD5 checksum 8b9bb897bb8cf2a8addf04be5b7b915f Compiled from "Student.java" public class Student minor version: 0 major version: 52 flags: ACC_PUBLIC, ACC_SUPER Constant pool: #1 = Methodref #4.#17 // java/lang/Object."<init>":()V #2 = Fieldref #3.#18 // Student.name:Ljava/lang/String; #3 = Class #19 // Student #4 = Class #20 // java/lang/Object #5 = Utf8 name #6 = Utf8 Ljava/lang/String; #7 = Utf8 <init> #8 = Utf8 ()V #9 = Utf8 Code #10 = Utf8 LineNumberTable #11 = Utf8 getName #12 = Utf8 ()Ljava/lang/String; #13 = Utf8 setName #14 = Utf8 (Ljava/lang/String;)V #15 = Utf8 SourceFile #16 = Utf8 Student.java #17 = NameAndType #7:#8 // "<init>":()V #18 = NameAndType #5:#6 // name:Ljava/lang/String; #19 = Utf8 Student #20 = Utf8 java/lang/Object { public Student(); descriptor: ()V flags: ACC_PUBLIC Code: stack=1, locals=1, args_size=1 0: aload_0 1: invokespecial #1 // Method java/lang/Object."<init>":()V 4: return LineNumberTable: line 1: 0 public java.lang.String getName(); descriptor: ()Ljava/lang/String; flags: ACC_PUBLIC Code: stack=1, locals=1, args_size=1 0: aload_0 1: getfield #2 // Field name:Ljava/lang/String; 4: areturn LineNumberTable: line 5: 0 public void setName(java.lang.String); descriptor: (Ljava/lang/String;)V flags: ACC_PUBLIC Code: stack=2, locals=2, args_size=2 0: aload_0 1: aload_1 2: putfield #2 // Field name:Ljava/lang/String; 5: return LineNumberTable: line 9: 0 line 10: 5 } SourceFile: "Student.java"