com.googlecode.aviator.asm.util

类 ASMifierClassVisitor

java.lang.Object

com.googlecode.aviator.asm.util.AbstractVisitor

com.googlecode.aviator.asm.util.ASMifierAbstractVisitor

com.googlecode.aviator.asm.util.ASMifierClassVisitor

所有已实现的接口:

ClassVisitor

public class ASMifierClassVisitor
extends ASMifierAbstractVisitor
implements ClassVisitor

A ClassVisitor that prints the ASM code that generates the classes it visits. This class visitor can be used to quickly write ASM code to generate some given bytecode:

• write the Java source code equivalent to the bytecode you want to generate;
• compile it with javac;
• make a ASMifierClassVisitor visit this compiled class (see the main method);
• edit the generated source code, if necessary.

The source code printed when visiting the Hello class is the following:

 import org.objectweb.asm.*;

 public class HelloDump implements Opcodes {

     public static byte[] dump() throws Exception {

         ClassWriter cw = new ClassWriter(0);
         FieldVisitor fv;
         MethodVisitor mv;
         AnnotationVisitor av0;

         cw.visit(49,
                 ACC_PUBLIC + ACC_SUPER,
                 "Hello",
                 null,
                 "java/lang/Object",
                 null);

         cw.visitSource("Hello.java", null);

         {
             mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
             mv.visitVarInsn(ALOAD, 0);
             mv.visitMethodInsn(INVOKESPECIAL,
                     "java/lang/Object",
                     "<init>",
                     "()V");
             mv.visitInsn(RETURN);
             mv.visitMaxs(1, 1);
             mv.visitEnd();
         }
         {
             mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC,
                     "main",
                     "([Ljava/lang/String;)V",
                     null,
                     null);
             mv.visitFieldInsn(GETSTATIC,
                     "java/lang/System",
                     "out",
                     "Ljava/io/PrintStream;");
             mv.visitLdcInsn("hello");
             mv.visitMethodInsn(INVOKEVIRTUAL,
                     "java/io/PrintStream",
                     "println",
                     "(Ljava/lang/String;)V");
             mv.visitInsn(RETURN);
             mv.visitMaxs(2, 1);
             mv.visitEnd();
         }
         cw.visitEnd();

         return cw.toByteArray();
     }
 }

 

where Hello is defined by:

 public class Hello {

     public static void main(String[] args) {
         System.out.println("hello");
     }
 }
 

作者:

Eric Bruneton, Eugene Kuleshov

字段概要

字段

限定符和类型	字段和说明
protected PrintWriter	pw The print writer to be used to print the class.

从类继承的字段 com.googlecode.aviator.asm.util.ASMifierAbstractVisitor

name

从类继承的字段 com.googlecode.aviator.asm.util.AbstractVisitor

buf, OPCODES, text, TYPES

构造器概要

构造器

构造器和说明
ASMifierClassVisitor(PrintWriter pw) Constructs a new ASMifierClassVisitor object.

方法概要

方法

限定符和类型	方法和说明
protected ASMifierMethodVisitor	createASMifierMethodVisitor()
static void	main(String[] args) Prints the ASM source code to generate the given class to the standard output.
void	visit(int version, int access, String name, String signature, String superName, String[] interfaces) Visits the header of the class.
AnnotationVisitor	visitAnnotation(String desc, boolean visible) Prints the ASM code that generates the given annotation.
void	visitEnd() Prints the ASM code to end the visit.
FieldVisitor	visitField(int access, String name, String desc, String signature, Object value) Visits a field of the class.
void	visitInnerClass(String name, String outerName, String innerName, int access) Visits information about an inner class.
MethodVisitor	visitMethod(int access, String name, String desc, String signature, String[] exceptions) Visits a method of the class.
void	visitOuterClass(String owner, String name, String desc) Visits the enclosing class of the class.
void	visitSource(String file, String debug) Visits the source of the class.

从类继承的方法 com.googlecode.aviator.asm.util.ASMifierAbstractVisitor

visitAttribute

从类继承的方法 com.googlecode.aviator.asm.util.AbstractVisitor

appendString, getDefaultAttributes, getText, print

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 com.googlecode.aviator.asm.ClassVisitor

visitAttribute

字段详细资料

pw

protected final PrintWriter pw

The print writer to be used to print the class.

构造器详细资料

ASMifierClassVisitor

public ASMifierClassVisitor(PrintWriter pw)

Constructs a new ASMifierClassVisitor object.

参数:

pw - the print writer to be used to print the class.

方法详细资料

main

public static void main(String[] args)
                 throws Exception

Prints the ASM source code to generate the given class to the standard output.

Usage: ASMifierClassVisitor [-debug] <fully qualified class name or class file name>

参数:

args - the command line arguments.

抛出:

Exception - if the class cannot be found, or if an IO exception occurs.

visit

public void visit(int version,
         int access,
         String name,
         String signature,
         String superName,
         String[] interfaces)

从接口复制的说明: ClassVisitor

Visits the header of the class.

指定者:

visit 在接口中 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 name 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 name 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)

从接口复制的说明: ClassVisitor

Visits the source of the class.

指定者:

visitSource 在接口中 ClassVisitor

参数:

file - the name of the source file from which the class was compiled. May be null.

debug - additional debug information to compute the correspondance between source and compiled elements of the class. May be null.

visitOuterClass

public void visitOuterClass(String owner,
                   String name,
                   String desc)

从接口复制的说明: ClassVisitor

Visits the enclosing class of the class. This method must be called only if the class has an enclosing class.

指定者:

visitOuterClass 在接口中 ClassVisitor

参数:

owner - internal name of the enclosing class of the class.

name - the name 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.

visitInnerClass

public void visitInnerClass(String name,
                   String outerName,
                   String innerName,
                   int access)

从接口复制的说明: ClassVisitor

Visits information about an inner class. This inner class is not necessarily a member of the class being visited.

指定者:

visitInnerClass 在接口中 ClassVisitor

参数:

name - the internal name of an inner class (see getInternalName).

outerName - the internal name of the class to which the inner class belongs (see getInternalName). May be null for not member classes.

innerName - the (simple) name 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)

从接口复制的说明: ClassVisitor

Visits a field of the class.

指定者:

visitField 在接口中 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 name.

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)

从接口复制的说明: 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.

指定者:

visitMethod 在接口中 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 name.

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.

createASMifierMethodVisitor

protected ASMifierMethodVisitor createASMifierMethodVisitor()

visitAnnotation

public AnnotationVisitor visitAnnotation(String desc,
                                boolean visible)

从类复制的说明: ASMifierAbstractVisitor

Prints the ASM code that generates the given annotation.

指定者:

visitAnnotation 在接口中 ClassVisitor

覆盖:

visitAnnotation 在类中 ASMifierAbstractVisitor

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.

visitEnd

public void visitEnd()

从类复制的说明: ASMifierAbstractVisitor

Prints the ASM code to end the visit.

指定者:

visitEnd 在接口中 ClassVisitor

覆盖:

visitEnd 在类中 ASMifierAbstractVisitor