程序包 org.beetl.ow2.asm.util

类 TraceClassVisitor

java.lang.Object
org.beetl.ow2.asm.ClassVisitor
org.beetl.ow2.asm.util.TraceClassVisitor
public final class TraceClassVisitor extends ClassVisitor
A ClassVisitor that prints the classes it visits with a Printer. This class visitor can be used in the middle of a class visitor chain to trace the class that is visited at a given point in this chain. This may be useful for debugging purposes.

The trace printed when visiting the Hello class is the following: 

 // class version 49.0 (49) // access flags 0x21 public class Hello {

 // compiled from: Hello.java

 // access flags 0x1 public <init> ()V ALOAD 0 INVOKESPECIAL
 java/lang/Object <init> ()V RETURN MAXSTACK = 1 MAXLOCALS = 1

 // access flags 0x9 public static main ([Ljava/lang/String;)V GETSTATIC
 java/lang/System out Ljava/io/PrintStream; LDC "hello"
 INVOKEVIRTUAL java/io/PrintStream println (Ljava/lang/String;)V RETURN
 MAXSTACK = 2 MAXLOCALS = 1 }
where Hello is defined by: 

 public class Hello {

     public static void main(String[] args) {
         System.out.println("hello");
     }
 }
作者:
Eric Bruneton, Eugene Kuleshov

  • 字段详细资料

    • p

      public final Printer p
      The object that actually converts visit events into text.

  • 构造器详细资料

    • TraceClassVisitor

      public TraceClassVisitor(PrintWriter pw)
      Constructs a new TraceClassVisitor.
      参数:
      pw - the print writer to be used to print the class.

    • TraceClassVisitor

      public TraceClassVisitor(ClassVisitor cv, PrintWriter pw)
      Constructs a new TraceClassVisitor.
      参数:
      cv - the ClassVisitor to which this visitor delegates calls. May be null.
      pw - the print writer to be used to print the class.

    • TraceClassVisitor

      public TraceClassVisitor(ClassVisitor cv, Printer p, PrintWriter pw)
      Constructs a new TraceClassVisitor.
      参数:
      cv - the ClassVisitor to which this visitor delegates calls. May be null.
      p - the object that actually converts visit events into text.
      pw - the print writer to be used to print the class. May be null if you simply want to use the result via Printer.getText(), instead of printing it.

  • 方法详细资料

    • visit

      public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
      从类复制的说明: ClassVisitor
      Visits the header of the class.
      覆盖:
      visit 在类中 ClassVisitor
      参数:
      version - the class version.
      access - the class's access flags (see Opcodes). This parameter also indicates if the class is deprecated.
      name - the internal className of the class (see getInternalName).
      signature - the signature of this class. May be null if the class is not a generic one, and does not extend or implement generic classes or interfaces.
      superName - the internal of className of the super class (see getInternalName). For interfaces, the super class is Object. May be null, but only for the Object class.
      interfaces - the internal names of the class's interfaces (see getInternalName). May be null.

    • visitSource

      public void visitSource(String file, String debug)
      从类复制的说明: ClassVisitor
      Visits the srccode of the class.
      覆盖:
      visitSource 在类中 ClassVisitor
      参数:
      file - the className of the srccode file from which the class was compiled. May be null.
      debug - additional debug information to compute the correspondance between srccode and compiled elements of the class. May be null.

    • visitOuterClass

      public void visitOuterClass(String owner, String name, String desc)
      从类复制的说明: ClassVisitor
      Visits the enclosing class of the class. This method must be called only if the class has an enclosing class.
      覆盖:
      visitOuterClass 在类中 ClassVisitor
      参数:
      owner - internal className of the enclosing class of the class.
      name - the className of the method that contains the class, or null if the class is not enclosed in a method of its enclosing class.
      desc - the descriptor of the method that contains the class, or null if the class is not enclosed in a method of its enclosing class.

    • visitAnnotation

      public AnnotationVisitor visitAnnotation(String desc, boolean visible)
      从类复制的说明: ClassVisitor
      Visits an annotation of the class.
      覆盖:
      visitAnnotation 在类中 ClassVisitor
      参数:
      desc - the class descriptor of the annotation class.
      visible - true if the annotation is visible at runtime.
      返回:
      a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

    • visitTypeAnnotation

      public AnnotationVisitor visitTypeAnnotation(int typeRef, TypePath typePath, String desc, boolean visible)
      从类复制的说明: ClassVisitor
      Visits an annotation on a type in the class signature.
      覆盖:
      visitTypeAnnotation 在类中 ClassVisitor
      参数:
      typeRef - a reference to the annotated type. The sort of this type reference must be CLASS_TYPE_PARAMETER, CLASS_TYPE_PARAMETER_BOUND or CLASS_EXTENDS. See TypeReference.
      typePath - the path to the annotated type argument, wildcard bound, array element type, or static inner type within 'typeRef'. May be null if the annotation targets 'typeRef' as a whole.
      desc - the class descriptor of the annotation class.
      visible - true if the annotation is visible at runtime.
      返回:
      a visitor to visit the annotation values, or null if this visitor is not interested in visiting this annotation.

    • visitAttribute

      public void visitAttribute(Attribute attr)
      从类复制的说明: ClassVisitor
      Visits a non standard attribute of the class.
      覆盖:
      visitAttribute 在类中 ClassVisitor
      参数:
      attr - an attribute.

    • visitInnerClass

      public void visitInnerClass(String name, String outerName, String innerName, int access)
      从类复制的说明: ClassVisitor
      Visits information about an inner class. This inner class is not necessarily a member of the class being visited.
      覆盖:
      visitInnerClass 在类中 ClassVisitor
      参数:
      name - the internal className of an inner class (see getInternalName).
      outerName - the internal className of the class to which the inner class belongs (see getInternalName). May be null for not member classes.
      innerName - the (simple) className of the inner class inside its enclosing class. May be null for anonymous inner classes.
      access - the access flags of the inner class as originally declared in the enclosing class.

    • visitField

      public FieldVisitor visitField(int access, String name, String desc, String signature, Object value)
      从类复制的说明: ClassVisitor
      Visits a field of the class.
      覆盖:
      visitField 在类中 ClassVisitor
      参数:
      access - the field's access flags (see Opcodes). This parameter also indicates if the field is synthetic and/or deprecated.
      name - the field's className.
      desc - the field's descriptor (see Type).
      signature - the field's signature. May be null if the field's type does not use generic types.
      value - the field's initial value. This parameter, which may be null if the field does not have an initial value, must be an Integer, a Float, a Long, a Double or a String (for int, float, long or String fields respectively). This parameter is only used for static fields. Its value is ignored for non static fields, which must be initialized through bytecode instructions in constructors or methods.
      返回:
      a visitor to visit field annotations and attributes, or null if this class visitor is not interested in visiting these annotations and attributes.

    • visitMethod

      public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
      从类复制的说明: ClassVisitor
      Visits a method of the class. This method must return a new MethodVisitor instance (or null) each time it is called, i.e., it should not return a previously returned visitor.
      覆盖:
      visitMethod 在类中 ClassVisitor
      参数:
      access - the method's access flags (see Opcodes). This parameter also indicates if the method is synthetic and/or deprecated.
      name - the method's className.
      desc - the method's descriptor (see Type).
      signature - the method's signature. May be null if the method parameters, return type and exceptions do not use generic types.
      exceptions - the internal names of the method's exception classes (see getInternalName). May be null.
      返回:
      an object to visit the byte code of the method, or null if this class visitor is not interested in visiting the code of this method.

    • visitEnd

      public void visitEnd()
      从类复制的说明: ClassVisitor
      Visits the end of the class. This method, which is the last one to be called, is used to inform the visitor that all the fields and methods of the class have been visited.
      覆盖:
      visitEnd 在类中 ClassVisitor