Package daikon.chicory

Class ChicoryPremain.ChicoryLoader

Object

ClassLoader

ChicoryLoader

Enclosing class:

ChicoryPremain

public static class ChicoryPremain.ChicoryLoader
extends ClassLoader

Classloader for the BCEL code. Using this classloader guarantees that we get the correct version of BCEL and not a possible incompatible version from elsewhere on the user's classpath. We also load daikon.chicory.Instrument via this (since that class is the user of all of the BCEL classes). All references to BCEL must be within that class (so that all references to BCEL will get resolved by this classloader).

There are several versions of BCEL that have been released:

• the original 5.2 version
• an interim 6.0 version
• the offical 6.0 release version
• the offical 6.1 release version
• the PLSE 6.1 release version (includes LocalVariableGen fix)
• the offical 6.2 release version (includes LocalVariableGen fix)
• the offical 6.3 release version
• the offical 6.3.1 release version
• the offical 6.4.1 release version
• the PLSE 6.4.1.1 release version (includes JDK 11 support)

Note that both Chicory and DynComp use the ChicoryLoader to load BCEL and to verify that the version loaded is acceptable. However, the official 6.1 release version is sufficient for Chicory while DynComp requires the latest PLSE 6.4.1.1 version. Hence, this loader only checks for the official 6.1 release version (or newer). After loading BCEL, DynComp will make an additional check to verify that the 6.4.1.1 version has been loaded.

There are two classes present in 6.1 and subsequent releases that are not in previous versions. Thus, we can identify version 6.1 (and later) of BCEL by the presence of the class: org.apache.bcel.classfile.ConstantModule.class.

Earlier versions of Chicory inspected all version of BCEL found on the path and selected the correct one, if present. We now (9/15/16) simplify this to say the first BCEL found must be the correct one. This allows us to use the normal loader for all of the classes.

Field Summary

Fields

Modifier and Type	Field	Description
static SimpleLog	debug	Log file if verbose is enabled.

Constructor Summary

Constructors

Constructor	Description
ChicoryLoader()	Constructor for special BCEL class loader.

Method Summary

Modifier and Type	Method	Description
protected Class<?>	loadClass(@BinaryName String name, boolean resolve)

Methods inherited from class ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findClass, findLibrary, findLoadedClass, findResource, findResource, findResources, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class Object

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

Field Detail

debug

public static final SimpleLog debug

Log file if verbose is enabled.

Constructor Detail

ChicoryLoader

public ChicoryLoader()
              throws IOException

Constructor for special BCEL class loader.

Throws:

IOException - if unable to load class

Method Detail

loadClass

protected Class<?> loadClass(@BinaryName String name,
                             boolean resolve)
                      throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException