org.apache.drill.exec.compile

Class DrillCheckClassAdapter

java.lang.Object

org.objectweb.asm.ClassVisitor

org.apache.drill.exec.compile.RetargetableClassVisitor

org.apache.drill.exec.compile.DrillCheckClassAdapter

public class DrillCheckClassAdapter
extends RetargetableClassVisitor

There's a bug in ASM's CheckClassAdapter. It chokes on classes that have the access bits for ACC_PROTECTED, ACC_PRIVATE, or ACC_FINAL set; it appears to be assuming that it is only called on top-level classes. However, when we compile classes, nested classes come out as byte arrays that are otherwise indistinguishable from top-level classes', except for the possible appearance of those access bits.

In order to get around this, we use the DrillCheckClassAdapter instead. This strips off the offending bits before passing the class to CheckClassAdapter, and then restores them before passing the class on to whatever delegate the DrillCheckClassAdapter is created with.

Field Summary

Fields inherited from class org.objectweb.asm.ClassVisitor

api, cv

Constructor Summary

Constructors

Modifier	Constructor and Description
	DrillCheckClassAdapter(org.objectweb.asm.ClassVisitor cv) See CheckClassAdapter(ClassVisitor).
	DrillCheckClassAdapter(int api, org.objectweb.asm.ClassVisitor cv) See CheckClassAdapter(ClassVisitor).
protected	DrillCheckClassAdapter(int api, org.objectweb.asm.ClassVisitor cv, boolean checkDataFlow) See CheckClassAdapter(ClassVisitor, boolean).

Method Summary

Modifier and Type	Method and Description
static void	verify(org.objectweb.asm.ClassReader cr, boolean dump, PrintWriter pw) See CheckClassAdapter.verify(ClassReader, boolean, PrintWriter).

Methods inherited from class org.apache.drill.exec.compile.RetargetableClassVisitor

setDelegate

Methods inherited from class org.objectweb.asm.ClassVisitor

visit, visitAnnotation, visitAttribute, visitEnd, visitField, visitInnerClass, visitMethod, visitModule, visitNestHost, visitNestMember, visitOuterClass, visitPermittedSubclass, visitRecordComponent, visitSource, visitTypeAnnotation

Methods inherited from class java.lang.Object

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

Constructor Detail

DrillCheckClassAdapter

public DrillCheckClassAdapter(org.objectweb.asm.ClassVisitor cv)

See CheckClassAdapter(ClassVisitor).

DrillCheckClassAdapter

public DrillCheckClassAdapter(int api,
                              org.objectweb.asm.ClassVisitor cv)

See CheckClassAdapter(ClassVisitor).

Parameters:

api - the api version

DrillCheckClassAdapter

protected DrillCheckClassAdapter(int api,
                                 org.objectweb.asm.ClassVisitor cv,
                                 boolean checkDataFlow)

See CheckClassAdapter(ClassVisitor, boolean).

Parameters:

api - the api version

Method Detail

verify

public static void verify(org.objectweb.asm.ClassReader cr,
                          boolean dump,
                          PrintWriter pw)

See CheckClassAdapter.verify(ClassReader, boolean, PrintWriter).