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spring-cglib-and-asm.drawio
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<mxCell id="VISHqFL7TcA8I7J5W86J-1" value="<h1 style=""><font style="font-size: 16px;">Spring CgLib + ASM 工作原理</font><font style="font-size: 12px; font-weight: normal;">（spring-core:5.3.27）</font></h1><div><font style="font-size: 12px; font-weight: normal;">Spring 实现 AOP 动态代理没有引入 CgLib 库，而是将 CgLib 库部分源码打包到了 spring-core，由于 CgLib 依赖 ASM，Spring 也将依赖的 ASM 部门源码打包到了 spring-core。</font></div><div><font style="font-size: 12px; font-weight: normal;">由于只是打包了部分代码 org.springframework.asm&nbsp;org.springframework.cglib 下的代码比 ASM Cglib 框架源码要少。</font></div><div>细节太多了，先暂停下，TODO</div><div><b>基础：</b></div><div>1. Java 字节码文件结构</div><p></p>" style="text;html=1;strokeColor=none;fillColor=none;spacing=5;spacingTop=-20;whiteSpace=wrap;overflow=hidden;rounded=0;" parent="1" vertex="1">
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<mxCell id="VISHqFL7TcA8I7J5W86J-3" value="<font color="#007fff" style="">Spring CgLib 借助 GeneratorStrategy<br>#generate()生成代理类的字节码<br>比如：DefaultGeneratorStrategy<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=11;" parent="1" vertex="1">
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<mxCell id="VISHqFL7TcA8I7J5W86J-5" value="<font color="#007fff"><b>// 1&nbsp;</b></font><br style="font-size: 11px;">DebuggingClassWriter cw = this.<b>getClassVisitor</b>();<br><font color="#007fff"><b>// 2</b> 这里 transform() 没有做任何转换参数原样返回，这里 cg 是 Enhancer 实例引用<br style="font-size: 11px;"></font>this.transform(cg).<b>generateClass</b>(cw);<br><font color="#007fff"><b>// 3</b> 以 Byte 数组形式输出 ClassWriter 中字节码</font><br style="font-size: 11px;">return this.transform(cw.<b>toByteArray</b>());" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=11;" parent="1" vertex="1">
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<mxCell id="VISHqFL7TcA8I7J5W86J-12" value="ClassWriter#<b>toByteArray</b>()<br><b><font color="#007fff">还支持输出 .class .asm 文件</font></b>" style="rounded=1;whiteSpace=wrap;html=1;align=center;fontSize=11;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="VISHqFL7TcA8I7J5W86J-17" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>ClassVisitor</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>提供了一组 visit 方法用于构建 Class 字节码</b></font></p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// ASM API 版本，默认 ASM9</font></p><p style="margin: 0px 0px 0px 4px;">protected final int api;<br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 装饰器模式</font></p><p style="margin: 0px 0px 0px 4px;">protected <b>ClassVisitor</b> cv;<br></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">重要方法：</font></p><p style="margin: 0px 0px 0px 4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="VISHqFL7TcA8I7J5W86J-18" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>DebuggingClassWriter</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><b><font color="#007fff">这个是 Spring CgLib 中的类</font></b></p><p style="margin: 0px 0px 0px 4px;"><b><font color="#007fff"><br></font></b></p><p style="margin: 0px 0px 0px 4px;">public static final String DEBUG_LOCATION_PROPERTY = <br>&nbsp; &nbsp; "cglib.debugLocation";</p><p style="margin: 0px 0px 0px 4px;">private static String <b>debugLocation</b> =<br>&nbsp; &nbsp; System.getProperty("<b>cglib.debugLocation</b>");</p><p style="margin: 0px 0px 0px 4px;">private static Constructor traceCtor;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 生成代理类的全限定名</font></p><p style="margin: 0px 0px 0px 4px;">private String <b>className</b>;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 被增强的类的全限定名</font></p><p style="margin: 0px 0px 0px 4px;"></p><p style="margin: 0px 0px 0px 4px;">private String <b>superName</b>;</p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><br style="font-size: 11px;"></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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<mxCell id="VISHqFL7TcA8I7J5W86J-22" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>ClassWriter</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><b><font color="#007fff">对应 Class 字节码结构, Class中各个部分的字节码最终都是要以byte形式写到这个类中</font></b></p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">public static final int COMPUTE_MAXS = 1;<br></p><p style="margin: 0px 0px 0px 4px;">public static final int COMPUTE_FRAMES = 2;<br></p><p style="margin: 0px 0px 0px 4px;">private final int <b>flags</b>;<br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 版本号，低16位是主版本号，高16位是次版本号</font></p><p style="margin: 0px 0px 0px 4px;">private int <b>version</b>;<br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>// 符号表</b></font></p><p style="margin: 0px 0px 0px 4px;">private final SymbolTable <b>symbolTable</b>;<br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// Class 的访问描述符，比如：ACC_PUBLIC</font></p><p style="margin: 0px 0px 0px 4px;">private int <b>accessFlags</b>;<br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// classname 在常量池中的索引</font></p><p style="margin: 0px 0px 0px 4px;">private int <b>thisClass</b>;<br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 父类名在常量池中的索引</font></p><p style="margin: 0px 0px 0px 4px;">private int <b>superClass</b>;</p><p style="margin: 0px 0px 0px 4px;">private int <b>interfaceCount</b>;<br></p><p style="margin: 0px 0px 0px 4px;">private int[] <b>interfaces</b>;<br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 后面的对象，基本都包含 symbolTable, 以及在symbolTable 中的索引</font></p><p style="margin: 0px 0px 0px 4px;">private FieldWriter <b>firstField</b>;<br></p><p style="margin: 0px 0px 0px 4px;">private FieldWriter <b>lastField</b>;</p><p style="margin: 0px 0px 0px 4px;">private MethodWriter <b>firstMethod</b>;</p><p style="margin: 0px 0px 0px 4px;">private MethodWriter <b>lastMethod</b>;</p><p style="margin: 0px 0px 0px 4px;">private int numberOfInnerClasses;</p><p style="margin: 0px 0px 0px 4px;">private ByteVector <b>innerClasses</b>;</p><p style="margin: 0px 0px 0px 4px;">private int enclosingClassIndex;</p><p style="margin: 0px 0px 0px 4px;">private int enclosingMethodIndex;</p><p style="margin: 0px 0px 0px 4px;">private int signatureIndex;</p><p style="margin: 0px 0px 0px 4px;">private int sourceFileIndex;</p><p style="margin: 0px 0px 0px 4px;">private ByteVector debugExtension;</p><p style="margin: 0px 0px 0px 4px;">private AnnotationWriter lastRuntimeVisibleAnnotation;</p><p style="margin: 0px 0px 0px 4px;">private AnnotationWriter lastRuntimeInvisibleAnnotation;</p><p style="margin: 0px 0px 0px 4px;">private AnnotationWriter lastRuntimeVisibleTypeAnnotation;</p><p style="margin: 0px 0px 0px 4px;">private AnnotationWriter lastRuntimeInvisibleTypeAnnotation;</p><p style="margin: 0px 0px 0px 4px;">private ModuleWriter moduleWriter;</p><p style="margin: 0px 0px 0px 4px;">private int nestHostClassIndex;</p><p style="margin: 0px 0px 0px 4px;">private int numberOfNestMemberClasses;</p><p style="margin: 0px 0px 0px 4px;">private ByteVector nestMemberClasses;</p><p style="margin: 0px 0px 0px 4px;">private int numberOfPermittedSubclasses;</p><p style="margin: 0px 0px 0px 4px;">private ByteVector permittedSubclasses;</p><p style="margin: 0px 0px 0px 4px;">private RecordComponentWriter firstRecordComponent;</p><p style="margin: 0px 0px 0px 4px;">private RecordComponentWriter lastRecordComponent;</p><p style="margin: 0px 0px 0px 4px;">private Attribute firstAttribute;</p><p style="margin: 0px 0px 0px 4px;">private int compute;</p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><br style="font-size: 11px;"></p><p style="margin: 0px 0px 0px 4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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Object.class : superclass;</div><div style="font-size: 10px;"><font color="#007fff">&nbsp; &nbsp; // <b>不能增强 final 修饰的类</b></font></div><div style="font-size: 10px;">&nbsp; &nbsp; if (TypeUtils.<b>isFinal</b>(sc.getModifiers()))</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; throw new IllegalArgumentException("Cannot subclass final class " + sc.getName());</div><div style="font-size: 10px;">&nbsp; &nbsp; <font color="#007fff">// <b>获取目标类型所有构造方法，然后过滤出 public protected (protectedOk=true) default (samePackageOk=true) 的构造器</b></font></div><div style="font-size: 10px;">&nbsp; &nbsp; List constructors = new ArrayList(Arrays.asList(sc.getDeclaredConstructors()));</div><div style="font-size: 10px;">&nbsp; &nbsp; filterConstructors(sc, constructors);</div><div style="font-size: 10px;"><br></div><div style="font-size: 10px;">&nbsp; &nbsp; List actualMethods = new ArrayList();</div><div style="font-size: 10px;">&nbsp; &nbsp; List interfaceMethods = new ArrayList();</div><div style="font-size: 10px;">&nbsp; &nbsp; final Set forcePublic = new HashSet();</div><div style="font-size: 10px;"><b><font color="#007fff">&nbsp; &nbsp; //依次并递归从目标类型、目标类型实现的接口类型中提取所有方法（用的getDeclaredMethods()</font><font color="#007fff">）存储到 actualMethods</font></b></div><div style="font-size: 10px;"><b><font color="#007fff">&nbsp; &nbsp; //依次并递归从 interfaces 类型中提取所有方法存储到 interfaceMethods 并添加到 actualMethods, 如果 forcePublic !=null, 为 interfaceMethods 中每个方法类型创建 Method 实例存储到 forcePublic</font></b></div><div style="font-size: 10px;"><b><font color="#007fff">&nbsp; &nbsp; //最后还需要过滤掉 actualMethods 中带有 static 、final 修饰符以及重复的方法类型</font></b></div><div style="font-size: 10px;"><font style="" color="#007fff">&nbsp; &nbsp; //内部代码比较简单不展开了</font></div><div style="font-size: 10px;">&nbsp; &nbsp; <b>getMethods</b>(sc, interfaces, actualMethods, interfaceMethods, forcePublic);</div><div style="font-size: 10px;"><br style="font-size: 10px;"></div><div style="font-size: 10px;"><b><font color="#007fff">&nbsp; &nbsp; // 将 actualMethods 进行转换，转换规则：将 abstract native synchronized 方法标记为非抽象、非本地、非同步方法，然后再标记为 final 方法，最后返回 MethodInfo&nbsp;</font></b></div><div style="font-size: 10px;">&nbsp; &nbsp; List <b>methods</b> = CollectionUtils.transform(actualMethods, new Transformer() { <font color="#007fff">// methods 中存储的是 MethodInfo&nbsp;</font></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; public Object transform(Object value) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Method method = (Method) value;</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int modifiers = <b>Constants.ACC_FINAL</b></div><div style="font-size: 10px;"><b>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | (method.getModifiers()</b></div><div style="font-size: 10px;"><b>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &amp; ~Constants.ACC_ABSTRACT</b></div><div style="font-size: 10px;"><b>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &amp; ~Constants.ACC_NATIVE</b></div><div style="font-size: 10px;"><b>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &amp; ~Constants.ACC_SYNCHRONIZED</b>);</div><div style="font-size: 10px;"><b><font color="#007fff"><span style=""><span style="">&nbsp;&nbsp;&nbsp;&nbsp;</span></span>&nbsp; &nbsp; // 如果有设置 forcePublic 将方法从 protected 重新标记为 public</font><br></b></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (forcePublic.contains(MethodWrapper.create(method))) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; modifiers = (modifiers &amp; ~Constants.ACC_PROTECTED) | Constants.ACC_PUBLIC;</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return ReflectUtils.getMethodInfo(method, modifiers);</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; }</div><div style="font-size: 10px;">&nbsp; &nbsp; });</div><div style="font-size: 10px;"><br style="font-size: 10px;"></div><div style="font-size: 10px;"><font color="#007fff"><b>&nbsp; &nbsp; // 后面开始构造代理类字节码主体</b></font></div><div style="font-size: 10px;">&nbsp; &nbsp; ClassEmitter <b>e</b> = new <b>ClassEmitter</b>(v);</div><div style="font-size: 10px;"><span style="background-color: initial;">&nbsp; &nbsp; if (currentData == null) {</span></div><font color="#007fff"><b>&nbsp; &nbsp; &nbsp; &nbsp; // 1 代理类类型基本信息写入ClassWriter<br></b></font><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; e.<b>begin_class</b>(Constants.V1_8,&nbsp; <font color="#007fff">//主版本号</font></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Constants.ACC_PUBLIC, <font color="#007fff">//类型修饰符，也称Class的访问标记</font></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; getClassName(),</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Type.getType(sc), <font color="#007fff">// 父类类型描述</font></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (useFactory ?</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; TypeUtils.<b>add</b>(TypeUtils.getTypes(interfaces), FACTORY) : <font color="#007fff">//额外添加要实现的接口&nbsp;org.springframework.cglib.proxy.<b>Factory</b></font></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; TypeUtils.<b>getTypes</b>(interfaces)),</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Constants.SOURCE_FILE);<font color="#007fff"> //&nbsp;&lt;generated&gt;</font></div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;">&nbsp; &nbsp; else {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; e.begin_class(Constants.V1_8,</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Constants.ACC_PUBLIC,</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; getClassName(),</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; null,</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new Type[]{FACTORY},</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Constants.SOURCE_FILE);</div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;"><b>&nbsp; &nbsp; <font color="#007fff">// 用于获取 sc 构造方法的方法信息 MethodInfo (包括方法签名、ClassInfo、方法修饰符、返回异常类型)</font></b></div><div style="font-size: 10px;">&nbsp; &nbsp; List <b>constructorInfo</b> = CollectionUtils.transform(constructors, MethodInfoTransformer.getInstance());</div><div style="font-size: 10px;"><font color="#007fff">&nbsp; &nbsp; // 定义 private boolean&nbsp;CGLIB$BOUND;&nbsp; 不过在 class 文件中并不是表示为这样</font></div><div style="font-size: 10px;">&nbsp; &nbsp; e.declare_field(Constants.ACC_PRIVATE, BOUND_FIELD, Type.BOOLEAN_TYPE, null);</div><div style="font-size: 10px;"><font color="#007fff">&nbsp; &nbsp; // 定义 public static Object&nbsp;CGLIB$FACTORY_DATA;</font></div><div style="font-size: 10px;">&nbsp; &nbsp; e.declare_field(Constants.ACC_PUBLIC | Constants.ACC_STATIC, FACTORY_DATA_FIELD, OBJECT_TYPE, null);</div><div style="font-size: 10px;">&nbsp; &nbsp; if (!interceptDuringConstruction) { <font color="#007fff">//是否拦截构造方法？</font></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; e.declare_field(Constants.ACC_PRIVATE, CONSTRUCTED_FIELD, Type.BOOLEAN_TYPE, null);</div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;"><font color="#007fff">&nbsp; &nbsp; // 定义 private final static ThreadLocal&nbsp;CGLIB$THREAD_CALLBACKS</font></div><div style="font-size: 10px;">&nbsp; &nbsp; e.declare_field(Constants.PRIVATE_FINAL_STATIC, THREAD_CALLBACKS_FIELD, THREAD_LOCAL, null);</div><div style="font-size: 10px;"><font color="#007fff">&nbsp; &nbsp; // 定义 <b>private final static&nbsp;Callback[]&nbsp;CGLIB$STATIC_CALLBACKS</b></font></div><div style="font-size: 10px;">&nbsp; &nbsp; e.declare_field(Constants.PRIVATE_FINAL_STATIC, STATIC_CALLBACKS_FIELD, CALLBACK_ARRAY, null);</div><div style="font-size: 10px;">&nbsp; &nbsp; if (serialVersionUID != null) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; e.declare_field(Constants.PRIVATE_FINAL_STATIC, Constants.SUID_FIELD_NAME, Type.LONG_TYPE, serialVersionUID);</div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;">&nbsp; &nbsp;<font color="#007fff"> <b>// 2 为代理方法增强类型（MethodInterceptor Dispatcher）创建字段, 比如</b></font></div><div style="font-size: 10px;"><font color="#007fff">&nbsp; &nbsp; // private</font><font color="#007fff">&nbsp;MethodInterceptor CGLIB#CALLBACK_0</font></div><div style="font-size: 10px;">&nbsp; &nbsp; for (int i = 0; i &lt; callbackTypes.length; i++) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; e.<b>declare_field</b>(Constants.ACC_PRIVATE, getCallbackField(i), <b>callbackTypes</b>[i], null);</div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;"><font color="#007fff">&nbsp; &nbsp; // private static Object&nbsp;CGLIB$CALLBACK_FILTER</font></div><div style="font-size: 10px;">&nbsp; &nbsp; e.declare_field(Constants.ACC_PRIVATE | Constants.ACC_STATIC, CALLBACK_FILTER_FIELD, OBJECT_TYPE, null);</div><div style="font-size: 10px;"><br style="font-size: 10px;"></div><div style="font-size: 10px;">&nbsp; &nbsp; if (currentData == null) {</div><div style="font-size: 10px;"><font color="#007fff"><b><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span>// 3 创建代理方法，遍历所有要创建的方法（结合MethodInfo Method信息）<br></b></font></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; <b>emitMethods</b>(e, methods, actualMethods);</div><div style="font-size: 10px;"><font color="#007fff"><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span>//创建构造方法</font><br></div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; <b>emitConstructors</b>(e, constructorInfo);</div><div style="font-size: 10px;">&nbsp; 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<mxCell id="FzdVbH49xBQuPaiEanxh-3" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>Enhancer</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>可以将 Enhancer 理解为代理类生成配置</b></font></p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private <b>EnhancerFactoryData</b> <b>currentData</b>;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private Object currentKey;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private Class[] interfaces;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>// 用于判断目标方法应该使用哪种方式增强，比如 CglibAopProxy 中提供了7种方式，分别对应一种 callbackType</b></font></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; &nbsp; private static final int <b>AOP_PROXY</b> = 0;&nbsp; // AOP_PROXY 使用 MethodInteceptor<span style=""></span></font></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"><font style="font-size: 10px;" color="#007fff"><span style=""><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp;</span></span>private static final int INVOKE_TARGET = 1;</span></font></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"><font style="font-size: 10px;" color="#007fff"><span style=""><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp;</span></span>private static final int NO_OVERRIDE = 2;</span></font></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"><font style="font-size: 10px;" color="#007fff"><span style=""><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp;</span></span>private static final int DISPATCH_TARGET = 3;</span></font></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"><font style="font-size: 10px;" color="#007fff"><span style=""><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp;</span></span>private static final int DISPATCH_ADVISED = 4;</span></font></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"><font style="font-size: 10px;" color="#007fff"><span style=""><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp;</span></span>private static final int INVOKE_EQUALS = 5;</span></font></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"></p><p style="margin: 0px 0px 0px 4px; font-size: 10px;"><font style="font-size: 10px;" color="#007fff"><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp;</span>private static final int INVOKE_HASHCODE = 6;</span></font></p><p style="margin: 0px 0px 0px 4px;">private CallbackFilter <b>filter</b>;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private Callback[] callbacks;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>// 增强逻辑类型，比如 MethodInterceptor Dispatcher</b></font></p><p style="margin: 0px 0px 0px 4px;">private Type[] <b>callbackTypes</b>;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private boolean validateCallbackTypes;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private boolean classOnly;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 被代理增强的目标类型（比如测试中的 TransferService），此字段为null则以 Object 作为目标类型</font></p><p style="margin: 0px 0px 0px 4px;">private Class <b>superclass</b>;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 参数类型</font></p><p style="margin: 0px 0px 0px 4px;">private Class[] argumentTypes;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 参数列表</font></p><p style="margin: 0px 0px 0px 4px;">private Object[] arguments;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 代理类是否应该实现 Factory 接口，即</font><span style="background-color: initial;"><font color="#007fff">org.springframework.cglib.proxy.<b>Factory</b></font></span></p><p style="margin: 0px 0px 0px 4px;">private boolean <b>useFactory</b> = true;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private Long serialVersionUID;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private boolean interceptDuringConstruction = true;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;"><br></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><br style="font-size: 11px;"></p><p style="margin: 0px 0px 0px 4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-39" value="方法 (Method) 的修饰符 (Modifier)" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-43" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>ClassEmitter</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>Class 发射器</b>，应该是想表达输出Class的意思, <b>其 emit_xxx方法最终是将字节码片段写入到 ClassWriter</b></font></p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//类字节码信息，这个类没有字段只是提供了几个方法</font></p><p style="margin: 0px 0px 0px 4px;">private <b>ClassInfo</b> classInfo;</p><p style="margin: 0px 0px 0px 4px;">private Map fieldInfo;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private static int hookCounter;</p><p style="margin: 0px 0px 0px 4px;">private MethodVisitor rawStaticInit;</p><p style="margin: 0px 0px 0px 4px;">private CodeEmitter staticInit;</p><p style="margin: 0px 0px 0px 4px;">private CodeEmitter staticHook;</p><p style="margin: 0px 0px 0px 4px;">private Signature staticHookSig;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;"><br></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><br style="font-size: 11px;"></p><p style="margin: 0px 0px 0px 4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-50" value="<div><font color="#007fff">// 这里 cv 是 DebuggingClassWriter</font></div><div>this.cv.<b>visit</b>(version, access, this.classInfo.getType().getInternalName(), (String)null, this.classInfo.getSuperType().getInternalName(), TypeUtils.toInternalNames(interfaces));</div><div>if (source != null) { <font color="#007fff">// 这个测试中是代理类，source 值是 “&lt;generated&gt;”</font></div><div>&nbsp; &nbsp; this.cv.<b>visitSource</b>(source, (String)null);</div><div>}</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=11;arcSize=8;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-52" value="<div>this.className = name.replace('/', '.');</div><div>this.superName = superName.replace('/', '.');</div><div><font color="#007fff"><b>// 调用父类(ClassVisitor)的visit方法, 内部调用ClassWriter将这些数据最终写到 ClassWriter</b></font></div><div>super.visit(version, access, name, signature, superName, interfaces);</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=11;arcSize=8;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-54" value="<div style="font-size: 10px;"><font color="#007fff"><b>// 写class头部信息</b></font></div><div style="font-size: 10px;">public final void <b>visit</b>(</div><div style="font-size: 10px;">&nbsp; &nbsp; final int version,</div><div style="font-size: 10px;">&nbsp; &nbsp; final int access,</div><div style="font-size: 10px;">&nbsp; &nbsp; final String name,</div><div style="font-size: 10px;">&nbsp; &nbsp; final String signature,</div><div style="font-size: 10px;">&nbsp; &nbsp; final String superName,</div><div style="font-size: 10px;">&nbsp; &nbsp; final String[] interfaces) {</div><div style="font-size: 10px;"><br style="font-size: 10px;"></div><div style="font-size: 10px;">&nbsp; &nbsp; this.<b>version</b> = version;</div><div style="font-size: 10px;">&nbsp; &nbsp; this.<b>accessFlags</b> = access;</div><div style="font-size: 10px;">&nbsp; &nbsp; this.thisClass = <b>symbolTable</b>.<b>setMajorVersionAndClassName</b>(version &amp; 0xFFFF, name);</div><div style="font-size: 10px;">&nbsp; &nbsp; if (signature != null) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; this.signatureIndex = <b>symbolTable</b>.addConstantUtf8(signature);</div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;">&nbsp; &nbsp; this.superClass = superName == null ? 0 : <b>symbolTable</b>.addConstantClass(superName).index;</div><div style="font-size: 10px;">&nbsp; &nbsp; if (interfaces != null &amp;&amp; interfaces.length &gt; 0) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; interfaceCount = interfaces.length;</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; this.interfaces = new int[interfaceCount];</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i &lt; interfaceCount; ++i) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; this.interfaces[i] = <b>symbolTable</b>.addConstantClass(interfaces[i]).index;</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; }</div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;">&nbsp; &nbsp; if (compute == MethodWriter.COMPUTE_MAX_STACK_AND_LOCAL <br>&nbsp; &nbsp; &nbsp; &nbsp; &amp;&amp; (version &amp; 0xFFFF) &gt;= Opcodes.V1_7) {</div><div style="font-size: 10px;">&nbsp; &nbsp; &nbsp; &nbsp; compute = MethodWriter.COMPUTE_MAX_STACK_AND_LOCAL_FROM_FRAMES;</div><div style="font-size: 10px;">&nbsp; &nbsp; }</div><div style="font-size: 10px;">}</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=10;arcSize=1;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-56" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>SymbolTable</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">符号表，The constant pool entries, the BootstrapMethods attribute entries and the (ASM specific) type table entries of a class.</font></p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">final ClassWriter classWriter;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private final ClassReader sourceClassReader;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 主版本号</font></p><p style="margin: 0px 0px 0px 4px;">private int majorVersion;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 类名</font></p><p style="margin: 0px 0px 0px 4px;">private String className;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private int entryCount;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private Entry[] entries;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">// 常量池中元素数量</font></p><p style="margin: 0px 0px 0px 4px;">private int constantPoolCount;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>// 常量池，ByteVector 就是 byte数组</b></font></p><p style="margin: 0px 0px 0px 4px;">private ByteVector <b>constantPool</b>;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private int bootstrapMethodCount;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private ByteVector <b>bootstrapMethods</b>;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private int typeCount;</p><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">private Entry[] <b>typeTable</b>;</p><div><br></div><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">重要方法：</font></p><p style="margin: 0px 0px 0px 4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-60" value="<div>this.fieldInfo.put(name, info);</div><div>this.cv.<b>visitField</b>(access, name, type.getDescriptor(), (String)null, value);</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=11;arcSize=8;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-62" value="<div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">callbackTypes = {Type[7]@6791}&nbsp;</font></div><div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">&nbsp;0 = {Type@7266} "Lorg/springframework/cglib/proxy/<b>MethodInterceptor</b>;"</font></div><div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">&nbsp;1 = {Type@7266} "Lorg/springframework/cglib/proxy/MethodInterceptor;"</font></div><div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">&nbsp;2 = {Type@7267} "Lorg/springframework/cglib/proxy/NoOp;"</font></div><div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">&nbsp;3 = {Type@7268} "Lorg/springframework/cglib/proxy/Dispatcher;"</font></div><div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">&nbsp;4 = {Type@7268} "Lorg/springframework/cglib/proxy/Dispatcher;"</font></div><div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">&nbsp;5 = {Type@7266} "Lorg/springframework/cglib/proxy/MethodInterceptor;"</font></div><div style="font-size: 11px;"><font color="#007fff" style="font-size: 11px;">&nbsp;6 = {Type@7266} "Lorg/springframework/cglib/proxy/MethodInterceptor;"</font></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=11;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-64" value="CallbackGenerator[] generators = CallbackInfo.getGenerators(callbackTypes);<br><font color="#007fff">// CallbackGenerator -&gt; List&lt;MethodInfo&gt;</font><br>Map groups = new HashMap();<br>...<br><div>Iterator it1 = methods.iterator();</div><div>Iterator it2 = (actualMethods != null) ? actualMethods.iterator() : null;</div><div><font color="#007fff"><b>// 先判断每个方法适合使用哪种 callbackType 增强，进行分组存储到 groups</b></font></div><div><b>while</b> (it1.hasNext()) {<br></div><div></div>&nbsp; &nbsp; MethodInfo method = (MethodInfo) it1.next();<br>&nbsp; &nbsp; Method actualMethod = (it2 != null) ? (Method) it2.next() : null;<br>&nbsp; &nbsp; <font color="#007fff">// 根据 CallbackFilter 判断 actualMethod 应该使用哪种 callbackType 增强</font><br>&nbsp; &nbsp; int index = filter.<b>accept</b>(actualMethod);<br>&nbsp; &nbsp;&nbsp;originalModifiers.put(method, (actualMethod != null ? actualMethod.getModifiers() : method.getModifiers()));<div>&nbsp; &nbsp; indexes.put(method, index);</div><div>&nbsp; &nbsp; List group = (List) groups.get(generators[index]);</div><div>&nbsp; &nbsp; if (group == null) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; groups.put(generators[index], group = new ArrayList(methods.size()));</div><div>&nbsp; &nbsp; }</div><div>&nbsp; &nbsp; <b>group.add(method);</b></div><div>&nbsp; &nbsp; ...</div><div>}</div><div><br></div><div><font color="#007fff"><b>// CodeEmitter 用于将方法的字节码片段输出到 ClassWriter</b></font></div><div>CodeEmitter se = ce.getStaticHook();<br></div><div>CallbackGenerator.Context context = new CallbackGenerator.Context() {...}<br></div><div><br></div><div><b><font color="#007fff">// 执行每一组方法的代理增强重写</font></b></div><div><div>for (int i = 0; i &lt; callbackTypes.length; i++) {</div><div>&nbsp; &nbsp; CallbackGenerator gen = generators[i];</div><div>&nbsp; &nbsp; if (!seenGen.contains(gen)) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; seenGen.add(gen);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; final List <b>fmethods</b> = (List) groups.get(gen);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; if (fmethods != null) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; try {</div><div><font color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 1&nbsp;</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; gen.<b>generate</b>(ce, context, fmethods);</div><div><font color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 2</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; gen.<b>generateStatic</b>(se, context, fmethods);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp;<span style="background-color: initial;">catch (RuntimeException x) {</span></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; throw x;</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp;<span style="background-color: initial;">catch (Exception x) {</span></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; throw new CodeGenerationException(x);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; }</div><div>}</div><div>se.return_value();</div><div>se.end_method();</div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=11;arcSize=2;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-68" value="<div>Map <b>sigMap</b> = new HashMap();</div><div>Iterator it = methods.iterator();</div><div>while(it.hasNext()) {</div><div>&nbsp; &nbsp; MethodInfo method = (MethodInfo)it.next();</div><div>&nbsp; &nbsp; Signature sig = method.getSignature();</div><div>&nbsp; &nbsp; Signature impl = context.getImplSignature(method);</div><div>&nbsp; &nbsp; String methodField = this.getMethodField(impl);</div><div>&nbsp; &nbsp; String methodProxyField = this.getMethodProxyField(impl);</div><div>&nbsp; &nbsp; sigMap.put(sig.toString(), methodProxyField);</div><div>&nbsp; &nbsp; ce.declare_field(26, methodField, METHOD, (Object)null);</div><div>&nbsp; &nbsp; ce.declare_field(26, methodProxyField, METHOD_PROXY, (Object)null);</div><div>&nbsp; &nbsp; ce.declare_field(26, "CGLIB$emptyArgs", Constants.TYPE_OBJECT_ARRAY, (Object)null);</div><div>&nbsp; &nbsp; <b>CodeEmitter</b> <b>e</b> = ce.begin_method(16, impl, method.getExceptionTypes());</div><div>&nbsp; &nbsp; superHelper(e, method, context);</div><div>&nbsp; &nbsp; e.return_value();</div><div>&nbsp; &nbsp; e.end_method();</div><div>&nbsp; &nbsp; e = context.<b>beginMethod</b>(ce, method);</div><div>&nbsp; &nbsp; Label nullInterceptor = e.make_label();</div><div>&nbsp; &nbsp; context.emitCallback(e, context.getIndex(method));</div><div>&nbsp; &nbsp; e.dup();</div><div>&nbsp; &nbsp; e.ifnull(nullInterceptor);</div><div>&nbsp; &nbsp; e.load_this();</div><div>&nbsp; &nbsp; e.getfield(methodField);</div><div>&nbsp; &nbsp; if (sig.getArgumentTypes().length == 0) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; e.getfield("CGLIB$emptyArgs");</div><div>&nbsp; &nbsp; } else {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; e.create_arg_array();</div><div>&nbsp; &nbsp; }</div><div><br></div><div>&nbsp; &nbsp; e.getfield(methodProxyField);</div><div>&nbsp; &nbsp; e.<b>invoke_interface</b>(METHOD_INTERCEPTOR, INTERCEPT);</div><div>&nbsp; &nbsp; e.unbox_or_zero(sig.getReturnType());</div><div>&nbsp; &nbsp; e.return_value();</div><div>&nbsp; &nbsp; e.mark(nullInterceptor);</div><div>&nbsp; &nbsp; superHelper(e, method, context);</div><div>&nbsp; &nbsp; e.return_value();</div><div>&nbsp; &nbsp; e.end_method();</div><div>}</div><div><br></div><div>this.<b>generateFindProxy</b>(ce, sigMap);</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=11;arcSize=2;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-70" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>CodeEmitter</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><font color="#007fff"><b>Code 发射器，其 emit_xxx 方法用于将方法的字节码片段最终输出到 ClassWriter</b></font></p><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;"><br></span></p><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;">private ClassEmitter ce;</span><br></p><p style="margin: 0px 0px 0px 4px;">private State state;</p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><br style="font-size: 11px;"></p><p style="margin: 0px 0px 0px 4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="FzdVbH49xBQuPaiEanxh-72" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>LocalVariablesSorter&nbsp;</b><span style="background-color: initial;">extends MethodVisitor</span></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><br></p><p style="margin: 0px 0px 0px 4px;">protected final int firstLocal;</p><p style="margin: 0px 0px 0px 4px;">private final State state;</p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><br style="font-size: 11px;"></p><p style="margin: 0px 0px 0px 4px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;" parent="1" vertex="1">
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<mxCell id="10TpCgqnUDmNamHutM36-1" value="<div><b>代理类生成后，ClassWriter 内部数据结构：</b></div><div><font color="#007fff"><br></font></div><div><font color="#007fff">cw = {<b>DebuggingClassWriter</b>@7008}&nbsp;</font></div><div><font color="#007fff">&nbsp;className = "top.kwseeker.labs.spring.transaction.service.TransferService$$EnhancerBySpringCGLIB$$d125a991"</font></div><div><font color="#007fff">&nbsp;superName = "top.kwseeker.labs.spring.transaction.service.TransferService"</font></div><div><font color="#007fff">&nbsp;api = 589824</font></div><div><font color="#007fff">&nbsp;cv = {<b>ClassWriter</b>@7027}&nbsp;</font></div><div><font color="#007fff">&nbsp; flags = 2</font></div><div><font color="#007fff">&nbsp; version = 52</font></div><div><font color="#007fff">&nbsp; <b>symbolTable</b> = {SymbolTable@7031}&nbsp;</font></div><div><font color="#007fff">&nbsp; accessFlags = 1</font></div><div><font color="#007fff">&nbsp; thisClass = 2</font></div><div><font color="#007fff">&nbsp; superClass = 4</font></div><div><font color="#007fff">&nbsp; interfaceCount = 3</font></div><div><font color="#007fff">&nbsp; <b>interfaces</b> = {int[3]@7087} [6, 8, 10]</font></div><div><font color="#007fff">&nbsp; <b>firstField</b> = {FieldWriter@7088}&nbsp;</font></div><div><font color="#007fff">&nbsp; <b>lastField</b> = {FieldWriter@7089}&nbsp;</font></div><div><font color="#007fff">&nbsp; <b>firstMethod</b> = {MethodWriter@7090}&nbsp;</font></div><div><font color="#007fff">&nbsp; <b>lastMethod</b> = {MethodWriter@7091}&nbsp;</font></div><div><font color="#007fff">&nbsp; numberOfInnerClasses = 0</font></div><div><font color="#007fff">&nbsp; <b>innerClasses</b> = null</font></div><div><font color="#007fff">&nbsp; enclosingClassIndex = 0</font></div><div><font color="#007fff">&nbsp; enclosingMethodIndex = 0</font></div><div><font color="#007fff">&nbsp; signatureIndex = 0</font></div><div><font color="#007fff">&nbsp; sourceFileIndex = 11</font></div><div><font color="#007fff">&nbsp; debugExtension = null</font></div><div><font color="#007fff">&nbsp; <b>lastRuntimeVisibleAnnotation</b> = null</font></div><div><font color="#007fff">&nbsp; <b>lastRuntimeInvisibleAnnotation</b> = null</font></div><div><font color="#007fff">&nbsp; lastRuntimeVisibleTypeAnnotation = null</font></div><div><font color="#007fff">&nbsp; lastRuntimeInvisibleTypeAnnotation = null</font></div><div><font color="#007fff">&nbsp; moduleWriter = null</font></div><div><font color="#007fff">&nbsp; nestHostClassIndex = 0</font></div><div><font color="#007fff">&nbsp; numberOfNestMemberClasses = 0</font></div><div><font color="#007fff">&nbsp; <b>nestMemberClasses</b> = null</font></div><div><font color="#007fff">&nbsp; numberOfPermittedSubclasses = 0</font></div><div><font color="#007fff">&nbsp; permittedSubclasses = null</font></div><div><font color="#007fff">&nbsp; firstRecordComponent = null</font></div><div><font color="#007fff">&nbsp; lastRecordComponent = null</font></div><div><font color="#007fff">&nbsp; firstAttribute = null</font></div><div><font color="#007fff">&nbsp; compute = 4</font></div><div><font color="#007fff">&nbsp; api = 589824</font></div><div><font color="#007fff">&nbsp; cv = null</font></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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<mxCell id="10TpCgqnUDmNamHutM36-2" value="<div>return (byte[])((byte[])AccessController.doPrivileged(new PrivilegedAction() {</div><div>&nbsp; &nbsp; public Object run() {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; byte[] b = ((ClassWriter)DebuggingClassWriter.access$001(DebuggingClassWriter.this)).toByteArray();</div><div><font color="#007fff"><b>&nbsp; &nbsp; &nbsp; &nbsp; // debugLocation 不为 null 就在 debugLocation 指定的路径下打印 .class 文件</b></font></div><div><b>&nbsp; &nbsp; &nbsp; &nbsp; if (DebuggingClassWriter.debugLocation != null) {</b></div><div><b><font color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 类的全限定名路径</font></b></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; String dirs = DebuggingClassWriter.this.className.replace('.', File.separatorChar);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; try {</div><div><b><font color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 文件路径： debugLocaltion + 全限定名路径 + .class</font></b></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (new File(DebuggingClassWriter.debugLocation + File.separatorChar + dirs)).getParentFile().mkdirs();</div><div><b>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; File file = new File(new File(DebuggingClassWriter.debugLocation), dirs + ".class");</b></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; OutputStream out = new BufferedOutputStream(new FileOutputStream(file));</div><div><br></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; try {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.write(b);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } finally {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.close();</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</div><div><font color="#007fff"><b><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp;&nbsp;</span></span><span style=""><span style="white-space: pre;">&nbsp;&nbsp;&nbsp; &nbsp;</span></span>// 还支持打印 .asm</b></font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (<b>DebuggingClassWriter.traceCtor </b>!= null) {</div><div>&nbsp; &nbsp;&nbsp;<b style="background-color: initial; border-color: var(--border-color);"><font style="border-color: var(--border-color);" color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 文件路径： debugLocaltion + 全限定名路径 + .asm</font></b></div><div><b>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; file = new File(new File(DebuggingClassWriter.debugLocation), dirs + ".asm");</b></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out = new BufferedOutputStream(new FileOutputStream(file));</div><div><br></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; try {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ClassReader cr = new ClassReader(b);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PrintWriter pw = new PrintWriter(new OutputStreamWriter(out));</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ClassVisitor tcv = (ClassVisitor)DebuggingClassWriter.traceCtor.newInstance(null, pw);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cr.accept(tcv, 0);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pw.flush();</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } finally {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.close();</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } catch (Exception var17) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; throw new CodeGenerationException(var17);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; &nbsp; &nbsp; }</div><div><br></div><div>&nbsp; &nbsp; &nbsp; &nbsp; return b;</div><div>&nbsp; &nbsp; }</div><div>}));</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;fontSize=11;fillColor=#dae8fc;strokeColor=#6c8ebf;arcSize=1;" vertex="1" parent="1">
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<mxCell id="10TpCgqnUDmNamHutM36-4" value="<b>注意</b>：<br>1 Spring 官方已经支持<b>查看生成的动态代理 .class 文件</b>，只需要设置系统属性 "<b>cglib.debugLocation</b>"<br><font color="#007fff">&nbsp; &nbsp;比如： "-Dcglib.debugLocation=/tmp/spring-cglib"</font>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=top;whiteSpace=wrap;rounded=0;" vertex="1" parent="1">
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<mxCell id="10TpCgqnUDmNamHutM36-6" value="<font color="#007fff">对 Class 内部还包括一些 FieldVisitor MethodVisitor 等，<br>分别用于构建字段、方法的字节码<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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<mxCell id="10TpCgqnUDmNamHutM36-7" value="<div>/tmp/spring-cglib</div><div>└── top</div><div>&nbsp; &nbsp; └── kwseeker</div><div>&nbsp; &nbsp; &nbsp; &nbsp; └── labs</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; └── spring</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; └── transaction</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ├── service</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ├── TransferService$$EnhancerBySpringCGLIB$$bc002a25$$FastClassBySpringCGLIB$$344f828.class</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ├── <b>TransferService$$EnhancerBySpringCGLIB$$bc002a25.class</b></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; └── TransferService$$FastClassBySpringCGLIB$$1b385304.class</div><div><font color="#007fff">上面两个 <b>Fast</b> 代理类是经过 CgLib 优化的代理类，使用索引而不是反射来调用方法提升性能。</font></div><div><font color="#007fff">但是调试可以发现默认基本还是使用的非 Fast 代理类。TODO why?</font></div><div><br></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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