一步一步来实现简单安卓性能监控之ANT打包方式

ProcessBuilder的改写逻辑

 private static ClassAdapter createProcessBuilderClassAdapter(final ClassVisitor cw, final Log log) {
 return new ClassAdapter(cw) {
 @Override
 public MethodVisitor visitMethod(final int access, final String name, final String desc, final String signature, final String[] exceptions) {
 MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
 if (START_METHOD_NAME.equals(name)) {
 mv = new SkipInstrumentedMethodsMethodVisitor(new BaseMethodVisitor(mv, access, name, desc) {
 @Override
 protected void onMethodEnter() {
 this.builder.loadInvocationDispatcher().loadInvocationDispatcherKey(getProxyInvocationKey(PROCESS_BUILDER_CLASS_NAME, this.methodName)).loadArray(new Runnable() {
 @Override
 public void run() {
 loadThis();
 invokeVirtual(Type.getObjectType(PROCESS_BUILDER_CLASS_NAME), new Method("command", "()Ljava/util/List;"));
 }
 }).invokeDispatcher();
 }
 });
 }
 return mv;
 }
 };
 }
 

ProcessBuilder的start方法，被改成了如下（我格式化了）

ProcessBuilder.png

ProcessBuilder的start方法都被谁调用了？

也就是，调用processBuilder的start每次进程开启都做了啥

 691599399962749==>Bootstrapping agent args:logfile=workspace\aaa.txt;tttt=true
 691600686737811==>Execute: [sdk\build-tools\25.0.1\aapt.exe, package, -f, -m, -0, apk, -M, workspace\bin\AndroidManifest.xml, -S, workspace\bin\res, -S, workspace\res, -I, sdk\platforms\android-19\android.jar, -J, workspace\gen, --generate-dependencies, -G, workspace\bin\proguard.txt]
 
 
691602027570542==>Execute: [sdk\build-tools\25.0.1\dx.bat, "-Jjavaagent:test-project\target\test-agentr=logfile=workspace\aaa.txt;tttt=true", --dex, --output, workspace\bin\dexedLibs\my-android-agent-efcafcfe1a4983df70fb48bca863819c.jar, workspace\libs\my-android-agent.jar]
 
 
691602351193570==>Bootstrapping agent args:logfile=workspace\aaa.txt;tttt=true
 691604575500820==>Execute: [sdk\build-tools\25.0.1\dx.bat, "-Jjavaagent:test-project\target\test-agentr=logfile=workspace\aaa.txt;tttt=true", --dex, --output, workspace\bin\dexedLibs\fastjson-1.1.26-android-efaf839430a0a7a8394d7d55b0c392d1.jar, workspace\libs\fastjson-1.1.26-android.jar]
 
 
691604872029960==>Bootstrapping agent args:logfile=workspace\aaa.txt;tttt=true
 691606526309021==>Execute: [sdk\build-tools\25.0.1\dx.bat, "-Jjavaagent:test-project\target\test-agentr=logfile=workspace\aaa.txt;tttt=true", --dex, --output, workspace\bin\dexedLibs\crittercism_v4_5_4_sdkonly-7db8d0f7a9e72de80599a5cf97e7d1fd.jar, workspace\libs\crittercism_v4_5_4_sdkonly.jar]
 
 
691606827791573==>Bootstrapping agent args:logfile=workspace\aaa.txt;tttt=true
 691608129313368==>Execute: [sdk\build-tools\25.0.1\dx.bat, "-Jjavaagent:test-project\target\test-agentr=logfile=workspace\aaa.txt;tttt=true", --dex, --output, workspace\bin\dexedLibs\locSDK_3.3-4a69856b79665c8024bbe9255dc0a123.jar, workspace\libs\locSDK_3.3.jar]
 
 
691608414309803==>Bootstrapping agent args:logfile=workspace\aaa.txt;tttt=true
 691609530548205==>Execute: [sdk\build-tools\25.0.1\dx.bat, "-Jjavaagent:test-project\target\test-agentr=logfile=workspace\aaa.txt;tttt=true", --dex, --output, workspace\bin\classes.dex, workspace\bin\classes, workspace\bin\dexedLibs\my-android-agent-efcafcfe1a4983df70fb48bca863819c.jar, workspace\bin\dexedLibs\fastjson-1.1.26-android-efaf839430a0a7a8394d7d55b0c392d1.jar, workspace\bin\dexedLibs\crittercism_v4_5_4_sdkonly-7db8d0f7a9e72de80599a5cf97e7d1fd.jar, workspace\bin\dexedLibs\locSDK_3.3-4a69856b79665c8024bbe9255dc0a123.jar]
 
 
691609830571207==>Bootstrapping agent args:logfile=workspace\aaa.txt;tttt=true
 691611183745961==>Execute: [sdk\build-tools\25.0.1\aapt.exe, crunch, -v, -S, workspace\res, -C, workspace\bin\res]
 
 
691611841932449==>Execute: [sdk\build-tools\25.0.1\aapt.exe, package, --no-crunch, -f, --debug-mode, -0, apk, -M, workspace\bin\AndroidManifest.xml, -S, workspace\bin\res, -S, workspace\res, -I, sdk\platforms\android-19\android.jar, -F, workspace\bin\SplashActivity.ap_, --generate-dependencies]
 
 
691612245238729==>Execute: [sdk\build-tools\25.0.1\zipalign.exe, -f, 4, workspace\bin\SplashActivity-debug-unaligned.apk, workspace\bin\SplashActivity-debug.apk]
 

分析

类似这个格式：691599399962749==>Bootstrapping agent args:logfile=workspace\aaa.txt;tttt=true ，打印的时候是一个Key-Value结构前面使用的是system.nanoTime，后面是运行参数。

这一行的意思是：javaagent的启动参数是 logfile=workspace\aaa.txt;tttt=true ，这个是外界给javaagent传递给javaagent的参数。
需要启动javaagent的时候这样 -javaagent:/path/to/javaagent/agent.jar=logfile=workspace\aaa.txt;tttt=true

• 下一行
  

  
   691600686737811==>Execute: [sdk\build-tools\25.0.1\aapt.exe, package, -f, -m, -0, apk, -M, workspace\bin\AndroidManifest.xml, -S, workspace\bin\res, -S, workspace\res, -I, sdk\platforms\android-19\android.jar, -J, workspace\gen, --generate-dependencies, -G, workspace\bin\proguard.txt]
   

  
  意思是，开启一个进程执行的命令参数是Execute后面的，也就是调用aapt命令处理资源

• 往下
  

  
   691602027570542==>Execute: [sdk\build-tools\25.0.1\dx.bat, "-Jjavaagent:test-project\target\test-agentr=logfile=workspace\aaa.txt;tttt=true", --dex, --output, workspace\bin\dexedLibs\my-android-agent-efcafcfe1a4983df70fb48bca863819c.jar, workspace\libs\my-android-agent.jar]
   

  
  意思是，执行dx命令来处理 my-android-agent.jar 文件，这里要注意，这里添加了一个javaagent参数哦！！！这个javaagent参数正式我们第一次启动javaagent的时候传递进来的。这里又被传到了子进程里面了。

再接着的几个都是调用dx命令处理jar文件为dalvik 能识别的格式！
最后调用aapt处理png的图片压缩，调用zipalign处理apk文件的对齐等!

就不写了，注意，这里的每一个命令都是在单独的进程执行的！

DexExecTask改写逻辑

 private static ClassAdapter createAntTaskClassAdapter(final ClassVisitor cw, final Log log) {
 final Map methodVisitors = new HashMap() {
 {
 
 
            put(new Method(PRE_DEX_LIBRARIES_METHOD_NAME, "(Ljava/util/List;)V"), new MethodVisitorFactory() {
                @Override
                public MethodVisitor create(final MethodVisitor mv, final int access, final String name, final String desc) {
                    return new BaseMethodVisitor(mv, access, name, desc) {
                        @Override
                        protected void onMethodEnter() {
                            this.builder.loadInvocationDispatcher().loadInvocationDispatcherKey(getProxyInvocationKey(ANT_DEX_EXEC_TASK, this.methodName))
                                    .loadArray(new Runnable() {
                                        @Override
                                        public void run() {
                                            loadArg(0);
                                        }
                                    }).invokeDispatcher(false);
                            this.loadThis();
                            this.swap();
                            this.putField(Type.getObjectType(ANT_DEX_EXEC_TASK), "BlueWareAgentFile", Type.getType(Object.class));
                        }
                    };
                }
            });
            put(new Method("runDx", "(Ljava/util/Collection;Ljava/lang/String;Z)V"), new MethodVisitorFactory() {
                @Override
                public MethodVisitor create(final MethodVisitor mv, final int access, final String name, final String desc) {
                    return new SafeInstrumentationMethodVisitor(mv, access, name, desc) {
                        @Override
                        protected void onMethodEnter() {
                            this.builder.loadInvocationDispatcher().loadInvocationDispatcherKey(SET_INSTRUMENTATION_DISABLED_FLAG).loadArray(new Runnable() {
                                @Override
                                public void run() {
                                    loadThis();
                                    getField(Type.getObjectType(ANT_DEX_EXEC_TASK), "BlueWareAgentFile", Type.getType(Object.class));
                                }
                            }).invokeDispatcher();
                        }
                    };
                }
            });
        }
    };
    return new ClassAdapterBase(log, cw, methodVisitors) {
        @Override
        public void visitEnd() {
            super.visitEnd();
            this.visitField(2, "BlueWareAgentFile", Type.getType(Object.class).getDescriptor(), null, null);
        }
    };
}
 
 

DexExecTask的preDexLibraries被改成了如下

插码preDexLibraries

DexExecTask的Rundx被改成了如下

rundx插码.png

com/android/dx/command/dexer/Main的processClass的改写逻辑

 private static ClassAdapter createDexerMainClassAdapter(final ClassVisitor cw, final Log log) {
 return new ClassAdapterBase(log, cw, new HashMap() {
 {
 put(new Method(PROCESS_CLASS_METHOD_NAME, "(Ljava/lang/String;[B)Z"), new MethodVisitorFactory() {
 @Override
 public MethodVisitor create(final MethodVisitor mv, final int access, final String name, final String desc) {
 return new BaseMethodVisitor(mv, access, name, desc) {
 @Override
 protected void onMethodEnter() {
 log.debug("Found onMethodEnter in processClass");
 final String proxyInvocationKey = getProxyInvocationKey(DEXER_MAIN_CLASS_NAME, this.methodName);
 this.builder.loadInvocationDispatcher().loadInvocationDispatcherKey(proxyInvocationKey).
 loadArgumentsArray(this.methodDesc).invokeDispatcher(false);
 this.checkCast(Type.getType(byte[].class));
 this.storeArg(1);
 }
 };
 }
 });
 
 
        }
    });
}
 
 

com/android/dx/command/dexer/Main的processClass被改成了

Paste_Image.png

结论

ANT_DEX_EXEC_TASK 这个任务，就没做什么核心的事情，它做的主要的事情是，

• 检测依赖的jar包是否有我们指定的jar包的名字
• 在rundex的时候，设置instrumentation是否可用

另外取消所有有关ANT_DEX_EXEC_TASK的任务，对打包以及插码没有任何影响