Jacoco项目主页：http://www.eclemma.org/jacoco/
本文地址：JacocoAnalyse

Content

• 调用的开源框架
  
  • Ant
  • ASM
• 测试源码对比
  
  • 插入前源码
  • 插入后源码
  • 插入前字节码
  • 插入后字节码
• 两种插桩模式
  
  • 插桩方式
  • Offline
  • On-the-fly
  • 比较
• 关于switch插桩分析
  
  • TableSwitch
  • Lookupswitch
• Report生成
  
  • Task report
  • Element executiondata
  • Element structure
  • Element xml
  • Element check
• 插桩策略
• 源码分析
  
  • 插桩
  • 生成报告
• 参考

调用的开源框架

Ant

开发文档：http://www.jacoco.org/jacoco/trunk/doc/ant.html

ASM

项目主页：http://asm.ow2.org/

ASM分析：ASM Analyse

测试源码对比

插入前源码

public class Hello
{
   
  public Hello()
  {
    int rand = (int)(Math.random() * 100.0D);
    if (rand % 2 == 0)
      System.out.println("Hi,0");
    else {
      System.out.println("Hi,1");
    }
    System.out.println("End");
  }
}

public class HelloTest
{
   
  public static void main(String[] args)
  {
    Hello h = new Hello();
  }
}

插入后源码

public class Hello
{
   
  public Hello()
  {
    arrayOfBoolean[0] = true;
    int rand = (int)(Math.random() * 100.0D);
    if (rand % 2 == 0) { arrayOfBoolean[1] = true;
      System.out.println("Hi,0"); arrayOfBoolean[2] = true;
    } else {
      System.out.println("Hi,1"); arrayOfBoolean[3] = true;
    }
    System.out.println("End");
    arrayOfBoolean[4] = true;
  }
}

public class HelloTest
{
   
  public HelloTest()
  {
    arrayOfBoolean[0] = true;
  }
  public static void main(String[] arg0) {
    boolean[] arrayOfBoolean = $jacocoInit(); Hello h = new Hello();
    arrayOfBoolean[1] = true;
  }
}

插入前字节码

F:\Jacoco\target\classes>javap -c Hello
Compiled from "Hello.java"
public class Hello {
  public Hello();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: invokestatic  #2                  // Method java/lang/Math.random:()D
       7: ldc2_w        #3                  // double 100.0d
      10: dmul
      11: d2i
      12: istore_1
      13: iload_1
      14: iconst_2
      15: irem
      16: ifne          30
      19: getstatic     #5                  // Field java/lang/System.out:Ljava/io/PrintStream;
      22: ldc           #6                  // String Hi,0
      24: invokevirtual #7                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      27: goto          38
      30: getstatic     #5                  // Field java/lang/System.out:Ljava/io/PrintStream;
      33: ldc           #8                  // String Hi,1
      35: invokevirtual #7                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      38: getstatic     #5                  // Field java/lang/System.out:Ljava/io/PrintStream;
      41: ldc           #9                  // String End
      43: invokevirtual #7                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
      46: return
}

插入后字节码

F:\Jacoco\target\classes-instr>javap -c Hello
Compiled from "Hello.java"
public class Hello {
  public Hello();
    Code:
       0: invokestatic  #49                 // Method $jacocoInit:()[Z
       3: astore_1
       4: aload_0
       5: invokespecial #1                  // Method java/lang/Object."<init>":()V
       8: aload_1
       9: iconst_0
      10: iconst_1
      11: bastore
      12: invokestatic  #2                  // Method java/lang/Math.random:()D
      15: ldc2_w        #3                  // double 100.0d
      18: dmul
      19: d2i
      20: istore_2
      21: iload_2
      22: iconst_2
      23: irem
      24: ifne          46
      27: aload_1
      28: iconst_1
      29: iconst_1
      30: bastore
      31: getstatic     #5                  // Field java/lang/System.out:Ljava/io/PrintStream;
      34: ldc           #6                  // String Hi,0
      36: invokevirtual #7