org.apache.bcel.generic
Interface InstructionConstants

All Known Implementing Classes:

InstructionFactory, PUSH

public interface InstructionConstants

This interface contains shareable instruction objects. In order to save memory you can use some instructions multiply, since they have an immutable state and are directly derived from Instruction. I.e. they have no instance fields that could be changed. Since some of these instructions like ICONST_0 occur very frequently this can save a lot of time and space. This feature is an adaptation of the FlyWeight design pattern, we just use an array instead of a factory. The Instructions can also accessed directly under their names, so it's possible to write il.append(Instruction.ICONST_0);

Version:

$Id: InstructionConstants.java 386056 2006-03-15 11:31:56Z tcurdt $

Nested Class Summary

static class

InstructionConstants.Clinit

Field Summary

static ArrayInstruction	AALOAD
static ArrayInstruction	AASTORE
static Instruction	ACONST_NULL
static LocalVariableInstruction	ALOAD_0
static LocalVariableInstruction	ALOAD_1
static LocalVariableInstruction	ALOAD_2
static ReturnInstruction	ARETURN
static Instruction	ARRAYLENGTH
static LocalVariableInstruction	ASTORE_0
static LocalVariableInstruction	ASTORE_1
static LocalVariableInstruction	ASTORE_2
static Instruction	ATHROW
static ArrayInstruction	BALOAD
static ArrayInstruction	BASTORE
static InstructionConstants.Clinit	bla Interfaces may have no static initializers, so we simulate this with an inner class.
static ArrayInstruction	CALOAD
static ArrayInstruction	CASTORE
static ConversionInstruction	D2F
static ConversionInstruction	D2I
static ConversionInstruction	D2L
static ArithmeticInstruction	DADD
static ArrayInstruction	DALOAD
static ArrayInstruction	DASTORE
static Instruction	DCMPG
static Instruction	DCMPL
static Instruction	DCONST_0
static Instruction	DCONST_1
static ArithmeticInstruction	DDIV
static ArithmeticInstruction	DMUL
static ArithmeticInstruction	DNEG
static ArithmeticInstruction	DREM
static ReturnInstruction	DRETURN
static ArithmeticInstruction	DSUB
static StackInstruction	DUP
static StackInstruction	DUP_X1
static StackInstruction	DUP_X2
static StackInstruction	DUP2
static StackInstruction	DUP2_X1
static StackInstruction	DUP2_X2
static ConversionInstruction	F2D
static ConversionInstruction	F2I
static ConversionInstruction	F2L
static ArithmeticInstruction	FADD
static ArrayInstruction	FALOAD
static ArrayInstruction	FASTORE
static Instruction	FCMPG
static Instruction	FCMPL
static Instruction	FCONST_0
static Instruction	FCONST_1
static Instruction	FCONST_2
static ArithmeticInstruction	FDIV
static ArithmeticInstruction	FMUL
static ArithmeticInstruction	FNEG
static ArithmeticInstruction	FREM
static ReturnInstruction	FRETURN
static ArithmeticInstruction	FSUB
static ConversionInstruction	I2B
static ConversionInstruction	I2C
static ConversionInstruction	I2D
static ConversionInstruction	I2F
static ConversionInstruction	I2L
static ConversionInstruction	I2S
static ArithmeticInstruction	IADD
static ArrayInstruction	IALOAD
static ArithmeticInstruction	IAND
static ArrayInstruction	IASTORE
static Instruction	ICONST_0
static Instruction	ICONST_1
static Instruction	ICONST_2
static Instruction	ICONST_3
static Instruction	ICONST_4
static Instruction	ICONST_5
static Instruction	ICONST_M1
static ArithmeticInstruction	IDIV
static LocalVariableInstruction	ILOAD_0
static LocalVariableInstruction	ILOAD_1
static LocalVariableInstruction	ILOAD_2
static ArithmeticInstruction	IMUL
static ArithmeticInstruction	INEG
static Instruction[]	INSTRUCTIONS Get object via its opcode, for immutable instructions like branch instructions entries are set to null.
static ArithmeticInstruction	IOR
static ArithmeticInstruction	IREM
static ReturnInstruction	IRETURN
static ArithmeticInstruction	ISHL
static ArithmeticInstruction	ISHR
static LocalVariableInstruction	ISTORE_0
static LocalVariableInstruction	ISTORE_1
static LocalVariableInstruction	ISTORE_2
static ArithmeticInstruction	ISUB
static ArithmeticInstruction	IUSHR
static ArithmeticInstruction	IXOR
static ConversionInstruction	L2D
static ConversionInstruction	L2F
static ConversionInstruction	L2I
static ArithmeticInstruction	LADD
static ArrayInstruction	LALOAD
static ArithmeticInstruction	LAND
static ArrayInstruction	LASTORE
static Instruction	LCMP
static Instruction	LCONST_0
static Instruction	LCONST_1
static ArithmeticInstruction	LDIV
static ArithmeticInstruction	LMUL
static ArithmeticInstruction	LNEG
static ArithmeticInstruction	LOR
static ArithmeticInstruction	LREM
static ReturnInstruction	LRETURN
static ArithmeticInstruction	LSHL
static ArithmeticInstruction	LSHR
static ArithmeticInstruction	LSUB
static ArithmeticInstruction	LUSHR
static ArithmeticInstruction	LXOR
static Instruction	MONITORENTER
static Instruction	MONITOREXIT
static Instruction	NOP Predefined instruction objects
static StackInstruction	POP
static StackInstruction	POP2
static ReturnInstruction	RETURN
static ArrayInstruction	SALOAD
static ArrayInstruction	SASTORE
static StackInstruction	SWAP
static LocalVariableInstruction	THIS You can use these constants in multiple places safely, if you can guarantee that you will never alter their internal values, e.g.

Field Detail

NOP

static final Instruction NOP

Predefined instruction objects

ACONST_NULL

static final Instruction ACONST_NULL

ICONST_M1

static final Instruction ICONST_M1

ICONST_0

static final Instruction ICONST_0

ICONST_1

static final Instruction ICONST_1

ICONST_2

static final Instruction ICONST_2

ICONST_3

static final Instruction ICONST_3

ICONST_4

static final Instruction ICONST_4

ICONST_5

static final Instruction ICONST_5

LCONST_0

static final Instruction LCONST_0

LCONST_1

static final Instruction LCONST_1

FCONST_0

static final Instruction FCONST_0

FCONST_1

static final Instruction FCONST_1

FCONST_2

static final Instruction FCONST_2

DCONST_0

static final Instruction DCONST_0

DCONST_1

static final Instruction DCONST_1

IALOAD

static final ArrayInstruction IALOAD

LALOAD

static final ArrayInstruction LALOAD

FALOAD

static final ArrayInstruction FALOAD

DALOAD

static final ArrayInstruction DALOAD

AALOAD

static final ArrayInstruction AALOAD

BALOAD

static final ArrayInstruction BALOAD

CALOAD

static final ArrayInstruction CALOAD

SALOAD

static final ArrayInstruction SALOAD

IASTORE

static final ArrayInstruction IASTORE

LASTORE

static final ArrayInstruction LASTORE

FASTORE

static final ArrayInstruction FASTORE

DASTORE

static final ArrayInstruction DASTORE

AASTORE

static final ArrayInstruction AASTORE

BASTORE

static final ArrayInstruction BASTORE

CASTORE

static final ArrayInstruction CASTORE

SASTORE

static final ArrayInstruction SASTORE

POP

static final StackInstruction POP

POP2

static final StackInstruction POP2

DUP

static final StackInstruction DUP

DUP_X1

static final StackInstruction DUP_X1

DUP_X2

static final StackInstruction DUP_X2

DUP2

static final StackInstruction DUP2

DUP2_X1

static final StackInstruction DUP2_X1

DUP2_X2

static final StackInstruction DUP2_X2

SWAP

static final StackInstruction SWAP

IADD

static final ArithmeticInstruction IADD

LADD

static final ArithmeticInstruction LADD

FADD

static final ArithmeticInstruction FADD

DADD

static final ArithmeticInstruction DADD

ISUB

static final ArithmeticInstruction ISUB

LSUB

static final ArithmeticInstruction LSUB

FSUB

static final ArithmeticInstruction FSUB

DSUB

static final ArithmeticInstruction DSUB

IMUL

static final ArithmeticInstruction IMUL

LMUL

static final ArithmeticInstruction LMUL

FMUL

static final ArithmeticInstruction FMUL

DMUL

static final ArithmeticInstruction DMUL

IDIV

static final ArithmeticInstruction IDIV

LDIV

static final ArithmeticInstruction LDIV

FDIV

static final ArithmeticInstruction FDIV

DDIV

static final ArithmeticInstruction DDIV

IREM

static final ArithmeticInstruction IREM

LREM

static final ArithmeticInstruction LREM

FREM

static final ArithmeticInstruction FREM

DREM

static final ArithmeticInstruction DREM

INEG

static final ArithmeticInstruction INEG

LNEG

static final ArithmeticInstruction LNEG

FNEG

static final ArithmeticInstruction FNEG

DNEG

static final ArithmeticInstruction DNEG

ISHL

static final ArithmeticInstruction ISHL

LSHL

static final ArithmeticInstruction LSHL

ISHR

static final ArithmeticInstruction ISHR

LSHR

static final ArithmeticInstruction LSHR

IUSHR

static final ArithmeticInstruction IUSHR

LUSHR

static final ArithmeticInstruction LUSHR

IAND

static final ArithmeticInstruction IAND

LAND

static final ArithmeticInstruction LAND

IOR

static final ArithmeticInstruction IOR

LOR

static final ArithmeticInstruction LOR

IXOR

static final ArithmeticInstruction IXOR

LXOR

static final ArithmeticInstruction LXOR

I2L

static final ConversionInstruction I2L

I2F

static final ConversionInstruction I2F

I2D

static final ConversionInstruction I2D

L2I

static final ConversionInstruction L2I

L2F

static final ConversionInstruction L2F

L2D

static final ConversionInstruction L2D

F2I

static final ConversionInstruction F2I

F2L

static final ConversionInstruction F2L

F2D

static final ConversionInstruction F2D

D2I

static final ConversionInstruction D2I

D2L

static final ConversionInstruction D2L

D2F

static final ConversionInstruction D2F

I2B

static final ConversionInstruction I2B

I2C

static final ConversionInstruction I2C

I2S

static final ConversionInstruction I2S

LCMP

static final Instruction LCMP

FCMPL

static final Instruction FCMPL

FCMPG

static final Instruction FCMPG

DCMPL

static final Instruction DCMPL

DCMPG

static final Instruction DCMPG

IRETURN

static final ReturnInstruction IRETURN

LRETURN

static final ReturnInstruction LRETURN

FRETURN

static final ReturnInstruction FRETURN

DRETURN

static final ReturnInstruction DRETURN

ARETURN

static final ReturnInstruction ARETURN

RETURN

static final ReturnInstruction RETURN

ARRAYLENGTH

static final Instruction ARRAYLENGTH

ATHROW

static final Instruction ATHROW

MONITORENTER

static final Instruction MONITORENTER

MONITOREXIT

static final Instruction MONITOREXIT

THIS

static final LocalVariableInstruction THIS

You can use these constants in multiple places safely, if you can guarantee that you will never alter their internal values, e.g. call setIndex().

ALOAD_0

static final LocalVariableInstruction ALOAD_0

ALOAD_1

static final LocalVariableInstruction ALOAD_1

ALOAD_2

static final LocalVariableInstruction ALOAD_2

ILOAD_0

static final LocalVariableInstruction ILOAD_0

ILOAD_1

static final LocalVariableInstruction ILOAD_1

ILOAD_2

static final LocalVariableInstruction ILOAD_2

ASTORE_0

static final LocalVariableInstruction ASTORE_0

ASTORE_1

static final LocalVariableInstruction ASTORE_1

ASTORE_2

static final LocalVariableInstruction ASTORE_2

ISTORE_0

static final LocalVariableInstruction ISTORE_0

ISTORE_1

static final LocalVariableInstruction ISTORE_1

ISTORE_2

static final LocalVariableInstruction ISTORE_2

INSTRUCTIONS

static final Instruction[] INSTRUCTIONS

Get object via its opcode, for immutable instructions like branch instructions entries are set to null.

bla

static final InstructionConstants.Clinit bla

Interfaces may have no static initializers, so we simulate this with an inner class.