edu.rice.cs.cunit.classFile.code
Class Opcode

java.lang.Object
  edu.rice.cs.cunit.classFile.code.Opcode

public abstract class Opcode
extends java.lang.Object

Java opcode class.

Author:

Mathias Ricken

Field Summary

static byte	AALOAD
static byte	AASTORE
static byte	ACONST_NULL
static byte	ALOAD
static byte	ALOAD_0
static byte	ALOAD_1
static byte	ALOAD_2
static byte	ALOAD_3
static byte	ANEWARRAY
static byte	ANEWARRAY_QUICK
static byte	ARETURN
static byte	ARRAYLENGTH
static byte	ASTORE
static byte	ASTORE_0
static byte	ASTORE_1
static byte	ASTORE_2
static byte	ASTORE_3
static byte	ATHROW
static byte	BALOAD
static byte	BASTORE
static byte	BIPUSH
static byte	BREAKPOINT
static byte	CALOAD
static byte	CASTORE
static byte	CHECKCAST
static byte	CHECKCAST_QUICK
static byte	D2F
static byte	D2I
static byte	D2L
static byte	DADD
static byte	DALOAD
static byte	DASTORE
static byte	DCMPG
static byte	DCMPL
static byte	DCONST_0
static byte	DCONST_1
static byte	DDIV
static byte	DLOAD
static byte	DLOAD_0
static byte	DLOAD_1
static byte	DLOAD_2
static byte	DLOAD_3
static byte	DMUL
static byte	DNEG
static byte	DREM
static byte	DRETURN
static byte	DSTORE
static byte	DSTORE_0
static byte	DSTORE_1
static byte	DSTORE_2
static byte	DSTORE_3
static byte	DSUB
static byte	DUP
static byte	DUP_X1
static byte	DUP_X2
static byte	DUP2
static byte	DUP2_X1
static byte	DUP2_X2
static byte	F2D
static byte	F2I
static byte	F2L
static byte	FADD
static byte	FALOAD
static byte	FASTORE
static byte	FCMPG
static byte	FCMPL
static byte	FCONST_0
static byte	FCONST_1
static byte	FCONST_2
static byte	FDIV
static byte	FLOAD
static byte	FLOAD_0
static byte	FLOAD_1
static byte	FLOAD_2
static byte	FLOAD_3
static byte	FMUL
static byte	FNEG
static byte	FREM
static byte	FRETURN
static byte	FSTORE
static byte	FSTORE_0
static byte	FSTORE_1
static byte	FSTORE_2
static byte	FSTORE_3
static byte	FSUB
static byte	GETFIELD
static byte	GETFIELD_QUICK
static byte	GETFIELD_QUICK_W
static byte	GETFIELD2_QUICK
static byte	GETSTATIC
static byte	GETSTATIC_QUICK
static byte	GETSTATIC2_QUICK
static byte	GOTO
static byte	GOTO_W
static byte	I2B
static byte	I2C
static byte	I2D
static byte	I2F
static byte	I2L
static byte	I2S
static byte	IADD
static byte	IALOAD
static byte	IAND
static byte	IASTORE
static byte	ICONST_0
static byte	ICONST_1
static byte	ICONST_2
static byte	ICONST_3
static byte	ICONST_4
static byte	ICONST_5
static byte	ICONST_M1
static byte	IDIV
static byte	IF_ACMPEQ
static byte	IF_ACMPNE
static byte	IF_ICMPEQ
static byte	IF_ICMPGE
static byte	IF_ICMPGT
static byte	IF_ICMPLE
static byte	IF_ICMPLT
static byte	IF_ICMPNE
static byte	IFEQ
static byte	IFGE
static byte	IFGT
static byte	IFLE
static byte	IFLT
static byte	IFNE
static byte	IFNONNULL
static byte	IFNULL
static byte	IINC
static byte	ILOAD
static byte	ILOAD_0
static byte	ILOAD_1
static byte	ILOAD_2
static byte	ILOAD_3
static byte	IMPDEP1
static byte	IMPDEP2
static byte	IMUL
static byte	INEG
static byte	INSTANCEOF
static byte	INSTANCEOF_QUICK
static byte	INVOKEINTERFACE
static byte	INVOKEINTERFACE_QUICK
static byte	INVOKENONVIRTUAL_QUICK
static byte	INVOKESPECIAL
static byte	INVOKESTATIC
static byte	INVOKESTATIC_QUICK
static byte	INVOKESUPER_QUICK
static byte	INVOKEVIRTUAL
static byte	INVOKEVIRTUAL_QUICK
static byte	INVOKEVIRTUAL_QUICK_W
static byte	INVOKEVIRTUALOBJECT_QUICK
static byte	IOR
static byte	IREM
static byte	IRETURN
private static boolean[]	isBranch Table determining if an code is a branch instruction.
static byte	ISHL
static byte	ISHR
static byte	ISTORE
static byte	ISTORE_0
static byte	ISTORE_1
static byte	ISTORE_2
static byte	ISTORE_3
static byte	ISUB
static byte	IUSHR
static byte	IXOR
static byte	JSR
static byte	JSR_W
static byte	L2D
static byte	L2F
static byte	L2I
static byte	LADD
static byte	LALOAD
static byte	LAND
static byte	LASTORE
static byte	LCMP
static byte	LCONST_0
static byte	LCONST_1
static byte	LDC
static byte	LDC_QUICK
static byte	LDC_W
static byte	LDC_W_QUICK
static byte	LDC2_W
static byte	LDC2_W_QUICK
static byte	LDIV
static byte	LLOAD
static byte	LLOAD_0
static byte	LLOAD_1
static byte	LLOAD_2
static byte	LLOAD_3
static byte	LMUL
static byte	LNEG
static byte	LOOKUPSWITCH
static byte	LOR
static byte	LREM
static byte	LRETURN
static byte	LSHL
static byte	LSHR
static byte	LSTORE
static byte	LSTORE_0
static byte	LSTORE_1
static byte	LSTORE_2
static byte	LSTORE_3
static byte	LSUB
static byte	LUSHR
static byte	LXOR
static byte	MONITORENTER
static byte	MONITOREXIT
static byte	MULTIANEWARRAY
static byte	MULTIANEWARRAY_QUICK
private static java.lang.String[]	NAMES Table of mnemonics.
static byte	NEW
static byte	NEW_QUICK
static byte	NEWARRAY
static byte	NOP
private static byte[]	OFFSET Table with code offsets.
static byte	POP
static byte	POP2
static byte	PUTFIELD
static byte	PUTFIELD_QUICK
static byte	PUTFIELD_QUICK_W
static byte	PUTFIELD2_QUICK
static byte	PUTSTATIC
static byte	PUTSTATIC_QUICK
static byte	PUTSTATIC2_QUICK
static byte	RET
static byte	RETURN
static byte	SALOAD
static byte	SASTORE
static byte	SIPUSH
static byte	SWAP
static byte	TABLESWITCH
static byte	UNKNOWN_DC
static byte	UNKNOWN_E5
static byte	UNKNOWN_E6
static byte	UNKNOWN_E7
static byte	UNKNOWN_E8
static byte	UNKNOWN_E9
static byte	UNKNOWN_EA
static byte	UNKNOWN_EB
static byte	UNKNOWN_EC
static byte	UNKNOWN_ED
static byte	UNKNOWN_EE
static byte	UNKNOWN_EF
static byte	UNKNOWN_F0
static byte	UNKNOWN_F1
static byte	UNKNOWN_F2
static byte	UNKNOWN_F3
static byte	UNKNOWN_F4
static byte	UNKNOWN_F5
static byte	UNKNOWN_F6
static byte	UNKNOWN_F7
static byte	UNKNOWN_F8
static byte	UNKNOWN_F9
static byte	UNKNOWN_FA
static byte	UNKNOWN_FB
static byte	UNKNOWN_FC
static byte	UNKNOWN_FD
static byte	WIDE
static byte	XXXUNUSEDXXX

Constructor Summary

Opcode()

Method Summary

static int[]	getBranchTargets(byte[] code, int pc, int paddingPC) Returns an array of branch targets for the instruction.
static int	getInstrSize(byte[] code, int pc) Return the length of the instruction at the specified offset in the bytecode array.
static int	getInstrSize(byte[] code, int pc, int paddingPC) Return the length of the instruction at the specified offset in the bytecode array.
static java.lang.String	getOpcodeName(byte opcode) Return a human-readable version of the code.
static AInstruction	getShortestLoadStoreInstruction(byte baseOpcode, short index) Return the shortest instruction possible that loads/stores local variable index onto the stack.
static boolean	isBranch(byte opcode) Return true if the specified code is a branch instruction.
static boolean	isJSR(byte opcode) Return true if the specified code is a subroutine call.
static boolean	isReturn(byte opcode) Return true if the specified code is a return instruction.
static boolean	isUnconditionalBranch(byte opcode) Return true if the specified code is an unconditional branch instruction.
static byte[]	repadInstr(byte[] code, int pc, int paddingPC, int newPC) Change the padding on the inside of the instruction found at pc, so that it is padded for a PC=newPC, not for a PC=paddingPC.
static void	setBranchTargets(byte[] code, int pc, int[] branchTargets) Sets the branch targets for an instruction.

Methods inherited from class java.lang.Object

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

Field Detail

NOP

public static final byte NOP

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ACONST_NULL

public static final byte ACONST_NULL

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ICONST_M1

public static final byte ICONST_M1

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ICONST_0

public static final byte ICONST_0

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ICONST_1

public static final byte ICONST_1

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ICONST_2

public static final byte ICONST_2

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ICONST_3

public static final byte ICONST_3

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ICONST_4

public static final byte ICONST_4

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ICONST_5

public static final byte ICONST_5

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LCONST_0

public static final byte LCONST_0

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LCONST_1

public static final byte LCONST_1

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FCONST_0

public static final byte FCONST_0

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FCONST_1

public static final byte FCONST_1

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FCONST_2

public static final byte FCONST_2

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DCONST_0

public static final byte DCONST_0

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DCONST_1

public static final byte DCONST_1

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BIPUSH

public static final byte BIPUSH

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SIPUSH

public static final byte SIPUSH

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LDC

public static final byte LDC

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LDC_W

public static final byte LDC_W

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LDC2_W

public static final byte LDC2_W

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ILOAD

public static final byte ILOAD

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LLOAD

public static final byte LLOAD

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FLOAD

public static final byte FLOAD

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DLOAD

public static final byte DLOAD

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ALOAD

public static final byte ALOAD

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ILOAD_0

public static final byte ILOAD_0

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ILOAD_1

public static final byte ILOAD_1

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ILOAD_2

public static final byte ILOAD_2

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ILOAD_3

public static final byte ILOAD_3

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LLOAD_0

public static final byte LLOAD_0

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LLOAD_1

public static final byte LLOAD_1

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LLOAD_2

public static final byte LLOAD_2

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LLOAD_3

public static final byte LLOAD_3

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FLOAD_0

public static final byte FLOAD_0

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FLOAD_1

public static final byte FLOAD_1

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FLOAD_2

public static final byte FLOAD_2

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FLOAD_3

public static final byte FLOAD_3

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DLOAD_0

public static final byte DLOAD_0

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DLOAD_1

public static final byte DLOAD_1

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DLOAD_2

public static final byte DLOAD_2

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DLOAD_3

public static final byte DLOAD_3

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ALOAD_0

public static final byte ALOAD_0

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ALOAD_1

public static final byte ALOAD_1

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ALOAD_2

public static final byte ALOAD_2

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ALOAD_3

public static final byte ALOAD_3

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IALOAD

public static final byte IALOAD

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LALOAD

public static final byte LALOAD

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FALOAD

public static final byte FALOAD

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DALOAD

public static final byte DALOAD

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AALOAD

public static final byte AALOAD

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BALOAD

public static final byte BALOAD

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CALOAD

public static final byte CALOAD

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SALOAD

public static final byte SALOAD

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ISTORE

public static final byte ISTORE

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LSTORE

public static final byte LSTORE

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FSTORE

public static final byte FSTORE

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DSTORE

public static final byte DSTORE

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ASTORE

public static final byte ASTORE

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ISTORE_0

public static final byte ISTORE_0

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ISTORE_1

public static final byte ISTORE_1

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ISTORE_2

public static final byte ISTORE_2

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ISTORE_3

public static final byte ISTORE_3

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LSTORE_0

public static final byte LSTORE_0

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LSTORE_1

public static final byte LSTORE_1

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LSTORE_2

public static final byte LSTORE_2

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LSTORE_3

public static final byte LSTORE_3

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FSTORE_0

public static final byte FSTORE_0

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FSTORE_1

public static final byte FSTORE_1

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FSTORE_2

public static final byte FSTORE_2

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FSTORE_3

public static final byte FSTORE_3

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DSTORE_0

public static final byte DSTORE_0

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DSTORE_1

public static final byte DSTORE_1

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DSTORE_2

public static final byte DSTORE_2

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DSTORE_3

public static final byte DSTORE_3

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ASTORE_0

public static final byte ASTORE_0

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ASTORE_1

public static final byte ASTORE_1

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ASTORE_2

public static final byte ASTORE_2

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ASTORE_3

public static final byte ASTORE_3

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IASTORE

public static final byte IASTORE

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LASTORE

public static final byte LASTORE

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FASTORE

public static final byte FASTORE

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DASTORE

public static final byte DASTORE

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AASTORE

public static final byte AASTORE

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BASTORE

public static final byte BASTORE

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CASTORE

public static final byte CASTORE

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SASTORE

public static final byte SASTORE

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POP

public static final byte POP

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POP2

public static final byte POP2

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DUP

public static final byte DUP

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DUP_X1

public static final byte DUP_X1

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DUP_X2

public static final byte DUP_X2

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DUP2

public static final byte DUP2

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DUP2_X1

public static final byte DUP2_X1

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DUP2_X2

public static final byte DUP2_X2

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SWAP

public static final byte SWAP

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IADD

public static final byte IADD

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LADD

public static final byte LADD

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FADD

public static final byte FADD

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DADD

public static final byte DADD

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ISUB

public static final byte ISUB

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LSUB

public static final byte LSUB

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FSUB

public static final byte FSUB

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DSUB

public static final byte DSUB

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IMUL

public static final byte IMUL

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LMUL

public static final byte LMUL

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FMUL

public static final byte FMUL

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DMUL

public static final byte DMUL

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IDIV

public static final byte IDIV

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LDIV

public static final byte LDIV

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FDIV

public static final byte FDIV

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DDIV

public static final byte DDIV

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IREM

public static final byte IREM

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LREM

public static final byte LREM

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FREM

public static final byte FREM

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DREM

public static final byte DREM

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INEG

public static final byte INEG

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LNEG

public static final byte LNEG

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FNEG

public static final byte FNEG

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DNEG

public static final byte DNEG

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ISHL

public static final byte ISHL

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LSHL

public static final byte LSHL

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ISHR

public static final byte ISHR

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LSHR

public static final byte LSHR

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IUSHR

public static final byte IUSHR

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LUSHR

public static final byte LUSHR

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IAND

public static final byte IAND

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LAND

public static final byte LAND

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IOR

public static final byte IOR

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LOR

public static final byte LOR

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IXOR

public static final byte IXOR

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LXOR

public static final byte LXOR

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IINC

public static final byte IINC

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I2L

public static final byte I2L

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I2F

public static final byte I2F

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I2D

public static final byte I2D

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L2I

public static final byte L2I

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L2F

public static final byte L2F

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L2D

public static final byte L2D

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F2I

public static final byte F2I

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F2L

public static final byte F2L

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F2D

public static final byte F2D

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D2I

public static final byte D2I

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D2L

public static final byte D2L

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D2F

public static final byte D2F

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I2B

public static final byte I2B

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I2C

public static final byte I2C

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I2S

public static final byte I2S

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LCMP

public static final byte LCMP

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FCMPL

public static final byte FCMPL

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FCMPG

public static final byte FCMPG

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DCMPL

public static final byte DCMPL

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DCMPG

public static final byte DCMPG

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IFEQ

public static final byte IFEQ

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IFNE

public static final byte IFNE

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IFLT

public static final byte IFLT

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IFGE

public static final byte IFGE

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IFGT

public static final byte IFGT

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IFLE

public static final byte IFLE

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IF_ICMPEQ

public static final byte IF_ICMPEQ

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IF_ICMPNE

public static final byte IF_ICMPNE

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IF_ICMPLT

public static final byte IF_ICMPLT

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IF_ICMPGE

public static final byte IF_ICMPGE

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IF_ICMPGT

public static final byte IF_ICMPGT

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IF_ICMPLE

public static final byte IF_ICMPLE

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IF_ACMPEQ

public static final byte IF_ACMPEQ

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IF_ACMPNE

public static final byte IF_ACMPNE

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GOTO

public static final byte GOTO

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JSR

public static final byte JSR

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RET

public static final byte RET

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TABLESWITCH

public static final byte TABLESWITCH

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LOOKUPSWITCH

public static final byte LOOKUPSWITCH

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IRETURN

public static final byte IRETURN

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LRETURN

public static final byte LRETURN

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FRETURN

public static final byte FRETURN

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DRETURN

public static final byte DRETURN

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ARETURN

public static final byte ARETURN

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RETURN

public static final byte RETURN

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GETSTATIC

public static final byte GETSTATIC

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PUTSTATIC

public static final byte PUTSTATIC

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GETFIELD

public static final byte GETFIELD

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PUTFIELD

public static final byte PUTFIELD

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INVOKEVIRTUAL

public static final byte INVOKEVIRTUAL

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INVOKESPECIAL

public static final byte INVOKESPECIAL

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INVOKESTATIC

public static final byte INVOKESTATIC

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INVOKEINTERFACE

public static final byte INVOKEINTERFACE

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XXXUNUSEDXXX

public static final byte XXXUNUSEDXXX

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NEW

public static final byte NEW

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NEWARRAY

public static final byte NEWARRAY

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ANEWARRAY

public static final byte ANEWARRAY

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ARRAYLENGTH

public static final byte ARRAYLENGTH

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ATHROW

public static final byte ATHROW

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CHECKCAST

public static final byte CHECKCAST

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INSTANCEOF

public static final byte INSTANCEOF

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MONITORENTER

public static final byte MONITORENTER

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MONITOREXIT

public static final byte MONITOREXIT

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WIDE

public static final byte WIDE

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MULTIANEWARRAY

public static final byte MULTIANEWARRAY

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IFNULL

public static final byte IFNULL

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IFNONNULL

public static final byte IFNONNULL

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GOTO_W

public static final byte GOTO_W

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JSR_W

public static final byte JSR_W

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BREAKPOINT

public static final byte BREAKPOINT

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LDC_QUICK

public static final byte LDC_QUICK

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LDC_W_QUICK

public static final byte LDC_W_QUICK

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LDC2_W_QUICK

public static final byte LDC2_W_QUICK

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GETFIELD_QUICK

public static final byte GETFIELD_QUICK

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PUTFIELD_QUICK

public static final byte PUTFIELD_QUICK

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GETFIELD2_QUICK

public static final byte GETFIELD2_QUICK

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PUTFIELD2_QUICK

public static final byte PUTFIELD2_QUICK

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GETSTATIC_QUICK

public static final byte GETSTATIC_QUICK

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PUTSTATIC_QUICK

public static final byte PUTSTATIC_QUICK

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GETSTATIC2_QUICK

public static final byte GETSTATIC2_QUICK

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PUTSTATIC2_QUICK

public static final byte PUTSTATIC2_QUICK

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Constant Field Values

INVOKEVIRTUAL_QUICK

public static final byte INVOKEVIRTUAL_QUICK

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INVOKENONVIRTUAL_QUICK

public static final byte INVOKENONVIRTUAL_QUICK

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INVOKESUPER_QUICK

public static final byte INVOKESUPER_QUICK

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INVOKESTATIC_QUICK

public static final byte INVOKESTATIC_QUICK

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INVOKEINTERFACE_QUICK

public static final byte INVOKEINTERFACE_QUICK

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INVOKEVIRTUALOBJECT_QUICK

public static final byte INVOKEVIRTUALOBJECT_QUICK

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UNKNOWN_DC

public static final byte UNKNOWN_DC

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NEW_QUICK

public static final byte NEW_QUICK

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ANEWARRAY_QUICK

public static final byte ANEWARRAY_QUICK

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MULTIANEWARRAY_QUICK

public static final byte MULTIANEWARRAY_QUICK

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CHECKCAST_QUICK

public static final byte CHECKCAST_QUICK

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INSTANCEOF_QUICK

public static final byte INSTANCEOF_QUICK

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INVOKEVIRTUAL_QUICK_W

public static final byte INVOKEVIRTUAL_QUICK_W

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GETFIELD_QUICK_W

public static final byte GETFIELD_QUICK_W

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PUTFIELD_QUICK_W

public static final byte PUTFIELD_QUICK_W

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UNKNOWN_E5

public static final byte UNKNOWN_E5

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UNKNOWN_E6

public static final byte UNKNOWN_E6

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UNKNOWN_E7

public static final byte UNKNOWN_E7

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UNKNOWN_E8

public static final byte UNKNOWN_E8

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UNKNOWN_E9

public static final byte UNKNOWN_E9

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UNKNOWN_EA

public static final byte UNKNOWN_EA

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UNKNOWN_EB

public static final byte UNKNOWN_EB

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UNKNOWN_EC

public static final byte UNKNOWN_EC

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UNKNOWN_ED

public static final byte UNKNOWN_ED

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UNKNOWN_EE

public static final byte UNKNOWN_EE

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UNKNOWN_EF

public static final byte UNKNOWN_EF

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UNKNOWN_F0

public static final byte UNKNOWN_F0

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UNKNOWN_F1

public static final byte UNKNOWN_F1

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UNKNOWN_F2

public static final byte UNKNOWN_F2

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UNKNOWN_F3

public static final byte UNKNOWN_F3

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UNKNOWN_F4

public static final byte UNKNOWN_F4

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UNKNOWN_F5

public static final byte UNKNOWN_F5

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UNKNOWN_F6

public static final byte UNKNOWN_F6

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UNKNOWN_F7

public static final byte UNKNOWN_F7

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UNKNOWN_F8

public static final byte UNKNOWN_F8

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UNKNOWN_F9

public static final byte UNKNOWN_F9

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UNKNOWN_FA

public static final byte UNKNOWN_FA

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UNKNOWN_FB

public static final byte UNKNOWN_FB

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UNKNOWN_FC

public static final byte UNKNOWN_FC

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UNKNOWN_FD

public static final byte UNKNOWN_FD

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IMPDEP1

public static final byte IMPDEP1

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IMPDEP2

public static final byte IMPDEP2

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NAMES

private static final java.lang.String[] NAMES

Table of mnemonics.

OFFSET

private static final byte[] OFFSET

Table with code offsets.

isBranch

private static final boolean[] isBranch

Table determining if an code is a branch instruction.

Constructor Detail

Opcode

public Opcode()

Method Detail

getOpcodeName

public static final java.lang.String getOpcodeName(byte opcode)

Return a human-readable version of the code.

Parameters:

opcode - code

Returns:

mnemonic

getInstrSize

public static final int getInstrSize(byte[] code,
                                     int pc)

Return the length of the instruction at the specified offset in the bytecode array. This includes the code itself and its operands.

Parameters:

code - the bytecode array.

pc - offset

Returns:

the length of the code and operands

getInstrSize

public static final int getInstrSize(byte[] code,
                                     int pc,
                                     int paddingPC)

Return the length of the instruction at the specified offset in the bytecode array. This includes the code itself and its operands.

Parameters:

code - the bytecode array.

pc - offset

paddingPC - offset for calculating padding

Returns:

the length of the code and operands

repadInstr

public static final byte[] repadInstr(byte[] code,
                                      int pc,
                                      int paddingPC,
                                      int newPC)

Change the padding on the inside of the instruction found at pc, so that it is padded for a PC=newPC, not for a PC=paddingPC.

Parameters:

code - bytecode

pc - start of instruction in bytecode array

paddingPC - old PC used for padding

newPC - new PC used for padding

Returns:

repadded bytecode array

isReturn

public static final boolean isReturn(byte opcode)

Return true if the specified code is a return instruction. NOTE: ATHROW is not a return instruction. It does not leave immediately if there are matching exception handlers.

Parameters:

opcode - code to check

Returns:

true if the code is a return instruction

isBranch

public static final boolean isBranch(byte opcode)

Return true if the specified code is a branch instruction.

Parameters:

opcode - code to check

Returns:

true if the code is a branch instruction

isUnconditionalBranch

public static final boolean isUnconditionalBranch(byte opcode)

Return true if the specified code is an unconditional branch instruction.

Parameters:

opcode - code to check

Returns:

true if the code is an unconditional branch instruction

isJSR

public static final boolean isJSR(byte opcode)

Return true if the specified code is a subroutine call.

Parameters:

opcode - code to check

Returns:

true if the code is a JSR or JSR_W instruction

getBranchTargets

public static final int[] getBranchTargets(byte[] code,
                                           int pc,
                                           int paddingPC)

Returns an array of branch targets for the instruction.

Parameters:

code - byte code

pc - program counter

paddingPC -

Returns:

array of branch targets

setBranchTargets

public static final void setBranchTargets(byte[] code,
                                          int pc,
                                          int[] branchTargets)

Sets the branch targets for an instruction. NOTE: The number of branch targets has to remain unchanged.

Parameters:

code - byte code

pc - program counter

branchTargets - array of branch targets

getShortestLoadStoreInstruction

public static AInstruction getShortestLoadStoreInstruction(byte baseOpcode,
                                                           short index)

Return the shortest instruction possible that loads/stores local variable index onto the stack.

Parameters:

baseOpcode - the kind of load/store (ALOAD, ILOAD, ...)

index - local variable index

Returns:

shortest instruction to load/store