com.newrelic.agent.util.asm

Class PatchedClassWriter

java.lang.Object

org.objectweb.asm.ClassVisitor

org.objectweb.asm.ClassWriter

com.newrelic.agent.util.asm.PatchedClassWriter

Direct Known Subclasses:

CustomClassLoaderClassWriter

public class PatchedClassWriter
extends org.objectweb.asm.ClassWriter

The normal ClassWriter uses the context classloader to resolve classes as it tries to compute frames which doesn't work for us because we're usually using alternate classloaders and referencing classes that can't be resolved through normal methods (they may not even be loaded yet). Also, the base ClassWriter has a side effect of causing classes to load which will cause trouble. This writer overrides the methods that try to load classes and uses a ClassResolver to understand the class structure without actually loading any classes.

Field Summary

Fields

Modifier and Type	Field and Description
protected ClassResolver	classResolver

Fields inherited from class org.objectweb.asm.ClassWriter

COMPUTE_FRAMES, COMPUTE_MAXS

Fields inherited from class org.objectweb.asm.ClassVisitor

api, cv

Constructor Summary

Constructors

Constructor and Description
PatchedClassWriter(int flags, java.lang.ClassLoader classLoader)
PatchedClassWriter(int flags, ClassResolver classResolver)

Method Summary

Modifier and Type	Method and Description
protected org.objectweb.asm.ClassReader	getClassReader(java.lang.String type)
protected java.lang.String	getCommonSuperClass(java.lang.String type1, java.lang.String type2)

Methods inherited from class org.objectweb.asm.ClassWriter

getClassLoader, hasFlags, newClass, newConst, newConstantDynamic, newField, newHandle, newHandle, newInvokeDynamic, newMethod, newMethodType, newModule, newNameType, newPackage, newUTF8, setFlags, toByteArray, visit, visitAnnotation, visitAttribute, visitEnd, visitField, visitInnerClass, visitMethod, visitModule, visitNestHost, visitNestMember, visitOuterClass, visitPermittedSubclass, visitRecordComponent, visitSource, visitTypeAnnotation

Methods inherited from class org.objectweb.asm.ClassVisitor

getDelegate

Methods inherited from class java.lang.Object

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

Field Detail

classResolver

protected final ClassResolver classResolver

Constructor Detail

PatchedClassWriter

public PatchedClassWriter(int flags,
                          java.lang.ClassLoader classLoader)

PatchedClassWriter

public PatchedClassWriter(int flags,
                          ClassResolver classResolver)

Method Detail

getCommonSuperClass

protected java.lang.String getCommonSuperClass(java.lang.String type1,
                                               java.lang.String type2)

Overrides:

getCommonSuperClass in class org.objectweb.asm.ClassWriter

getClassReader

protected org.objectweb.asm.ClassReader getClassReader(java.lang.String type)
                                                throws java.io.IOException

Throws:

java.io.IOException