jmplib.agent.impl

Class ExternalFieldAccessTransformer

java.lang.Object

jmplib.agent.AbstractTransformer

jmplib.agent.impl.ExternalFieldAccessTransformer

All Implemented Interfaces:

java.lang.instrument.ClassFileTransformer, org.objectweb.asm.Opcodes

public class ExternalFieldAccessTransformer
extends AbstractTransformer
implements org.objectweb.asm.Opcodes

This transformer changes the external field access inside the original access with method calls to its invoker methods.

Author:

Ignacio Lagartos

Field Summary

Fields inherited from interface org.objectweb.asm.Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM4, ASM5, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8

Constructor Summary

Constructors

Constructor and Description
ExternalFieldAccessTransformer()

Method Summary

Modifier and Type	Method and Description
protected boolean	instrumentableClass(java.lang.String className, java.lang.Class<?> classBeingRedefined) It is aplicable when it is not the first load of the class, the class is inside the instrumentables collection inside the UpdaterAgent class, the class is not a version class and the class does not have a new version.
byte[]	transform(java.lang.String className, java.lang.Class<?> classBeingRedefined, byte[] classfileBuffer) Replaces the external access with auxiliar method calls.

Methods inherited from class jmplib.agent.AbstractTransformer

transform

Methods inherited from class java.lang.Object

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

Constructor Detail

ExternalFieldAccessTransformer

public ExternalFieldAccessTransformer()

Method Detail

instrumentableClass

protected boolean instrumentableClass(java.lang.String className,
                                      java.lang.Class<?> classBeingRedefined)

It is aplicable when it is not the first load of the class, the class is inside the instrumentables collection inside the UpdaterAgent class, the class is not a version class and the class does not have a new version.

Specified by:

instrumentableClass in class AbstractTransformer

Parameters:

className - The internal class name

classBeingRedefined - The Class object

Returns:

transform

public byte[] transform(java.lang.String className,
                        java.lang.Class<?> classBeingRedefined,
                        byte[] classfileBuffer)

Replaces the external access with auxiliar method calls.

Specified by:

transform in class AbstractTransformer

Parameters:

className - The internal class name

classBeingRedefined - The Class object or nullF

classfileBuffer - The bytes of the class

Returns: