com.google.monitoring.runtime.instrumentation
Class VerifyingClassAdapter

java.lang.Object
  org.objectweb.asm.ClassVisitor
      com.google.monitoring.runtime.instrumentation.VerifyingClassAdapter

public class VerifyingClassAdapter
extends org.objectweb.asm.ClassVisitor

This is a class writer that gets used in place of the existing ClassWriter, and verifies properties of the class getting written. Currently, it only checks to see if the methods are of the correct length for Java methods (<64K).

Author:

jeremymanson@google.com (Jeremy Manson)

Nested Class Summary

static class

VerifyingClassAdapter.State An enum which indicates whether the class in question is verified.

Field Summary

Fields inherited from class org.objectweb.asm.ClassVisitor

api, cv

Constructor Summary

VerifyingClassAdapter(org.objectweb.asm.ClassWriter cw, byte[] original, String className)

Method Summary

boolean	isVerified() Gets the verification state of this class.
byte[]	toByteArray() Returns the byte array that contains the byte code for this class.
void	visitEnd()
org.objectweb.asm.MethodVisitor	visitMethod(int access, String name, String desc, String signature, String[] exceptions) In addition, the returned MethodVisitor will throw an exception if the method is greater than 64K in length.

Methods inherited from class org.objectweb.asm.ClassVisitor

visit, visitAnnotation, visitAttribute, visitField, visitInnerClass, visitOuterClass, visitSource, visitTypeAnnotation

Methods inherited from class java.lang.Object

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

Constructor Detail

VerifyingClassAdapter

public VerifyingClassAdapter(org.objectweb.asm.ClassWriter cw,
                             byte[] original,
                             String className)

Parameters:

cw - A class writer that is wrapped by this class adapter

original - the original bytecode

className - the name of the class being examined.

Method Detail

visitMethod

public org.objectweb.asm.MethodVisitor visitMethod(int access,
                                                   String name,
                                                   String desc,
                                                   String signature,
                                                   String[] exceptions)

In addition, the returned MethodVisitor will throw an exception if the method is greater than 64K in length.

Overrides:

visitMethod in class org.objectweb.asm.ClassVisitor

visitEnd

public void visitEnd()

Overrides:

visitEnd in class org.objectweb.asm.ClassVisitor

isVerified

public boolean isVerified()

Gets the verification state of this class.

Returns:

true iff the class passed inspection.

toByteArray

public byte[] toByteArray()

Returns the byte array that contains the byte code for this class.

Returns:

a byte array.