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

Nested Classes

Modifier and Type	Class and Description
static class	VerifyingClassAdapter.State An enum which indicates whether the class in question is verified.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
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

equals, 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.