调试工具BTrace

package com.ddc.mem;

public     class CaseObject{
     
       private static int sleepTotalTime=0; 
     
       public boolean execute(int sleepTime) throws Exception{
           System.out.println("sleep: "+sleepTime);
           sleepTotalTime+=sleepTime;
           Thread.sleep(sleepTime);
           if(sleepTime%2==0)
               return true;
           else 
               return false;
       }
     
    }

package com.ddc.mem;

import java.util.Random;

public class CaseObjectMain {

       public static void main(String[] args) throws Exception{
              Random random=new Random();
              CaseObject object=new CaseObject();
              while(true){
                  boolean result=object.execute(random.nextInt(1000));
                 Thread.sleep(1000);
              }
           }
}

/* BTrace Script Template */
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;

@BTrace
public class TracingScript {
    /* put your code here */
/*指明要查看的方法，类*/
  @OnMethod(
     clazz="com.ddc.mem.CaseObject",
     method="execute",
     location=@Location(Kind.RETURN)
  )
/*主要两个参数是对象自己的引用 和 返回值，其它参数都是方法调用时传入的参数*/
   public static void traceExecute(@Self com.ddc.mem.CaseObject object,int sleepTime, @Return boolean result){
      println("调用堆栈！！");
       println(strcat("返回结果是：",str(result)));
      jstack();
      println(strcat("时间是：",str(sleepTime)));
   }

}

#! /bin/sh

#需要设置jdk的路径，因为需要动态编译，所以需要设置这个路径
JAVA_HOME=/usr/lib/jvm/java-6-sun-1.6.0.22
#因为需要动态编译，所以需要设置原类库的classpath，主要是要编译BTRACE文件，它里面肯定有依赖原类
CLASS_PATH=/data/testxiao/
#BTRACE_HOME路径，编译以及运行时都需要BTRACE自己的jar包
BTRACE_HOME=/data/btrace
if [ -z "$BTRACE_HOME" -o ! -d "$BTRACE_HOME" ] ; then
  # resolve links - $0 could be a link to btrace's home
  PRG="$0"
  progname=`basename "$0"`
  BTRACE_HOME=`dirname "$PRG"`/..
  BTRACE_HOME=`cd "$BTRACE_HOME" && pwd`
fi

if [ -f "${BTRACE_HOME}/build/btrace-client.jar" ] ; then
    if [ "${JAVA_HOME}" != "" ]; then
       case "`uname`" in
          Darwin*)
              # In Mac OS X, tools.jar is classes.jar and is kept in a 
              # different location. Check if we can locate classes.jar
              # based on ${JAVA_VERSION}
              TOOLS_JAR="/System/Library/Frameworks/JavaVM.framework/Versions/${JAVA_VERSION}/Classes/classes.jar"

              # if we can't find, try relative path from ${JAVA_HOME}. Usually,
              # /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home
              # is JAVA_HOME. (or whatever version beyond 1.6.0!)
              if [ ! -f ${TOOLS_JAR} ] ; then
                  TOOLS_JAR="${JAVA_HOME}/../Classes/classes.jar" 
              fi

              # If we still can't find, tell the user to set JAVA_VERSION.
              # This way, we can avoid zip file errors from the agent side
              # and "connection refused" message from client.
              if [ ! -f ${TOOLS_JAR} ] ; then
                  echo "Please set JAVA_VERSION to the target java version"
                  exit 1
              fi
          ;;
          *)
              TOOLS_JAR="${JAVA_HOME}/lib/tools.jar"
          ;;
       esac
       ${JAVA_HOME}/bin/java -Dcom.sun.btrace.probeDescPath=. -Dcom.sun.btrace.dumpClasses=false -Dcom.sun.btrace.debug=false -Dcom.sun.btrace.unsafe=false -cp ${BTRACE_HOME}/build/btrace-client.jar:${TOOLS_JAR}:/usr/share/lib/java/dtrace.jar:${CLASS_PATH} com.sun.btrace.client.Main $*
    else
       echo "Please set JAVA_HOME before running this script"
       exit 1
    fi
else
    echo "Please set BTRACE_HOME before running this script"
    exit 1
fi

package com.huawei.main;
import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Main
{
    public static void main(String[] args) throws Exception
    { 
        Main test = new Main();
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        for (int i = 0; i < 10; i++)
        {
            reader.readLine();
            int a = (int) Math.round(Math.random() * 1000);
            int b = (int) Math.round(Math.random() * 1000);
            System.out.println(test.add(a, b));
        }
    }
    public int add(int a, int b)
    {
        return a + b;
    }
}

import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
 
@BTrace
public class TraceScript
{
      @OnMethod(clazz="com.huawei.main.Main", method="add", location=@Location(Kind.RETURN))
      public static void func(int a, int b, @Return int result)
      {
              jstack();
              println(strcat("para A: ", str(a)));
              println(strcat("para B: ", str(b)));
              println(strcat("result: ", str(result)));
      }
}

1. int

1. @OnMethod(clazz="java.util.HashSet", method="/.*/")  
2. public static void allListMethodsEntry(@Self java.util.HashSet set) throws
3. if(identityHashCode(set) ==  hashCode ) {          
4.                      ...  
5.               }  
6. }