edu.rice.cs.cunit.classFile.code.instructions
Class AInstruction

java.lang.Object
  edu.rice.cs.cunit.classFile.code.instructions.AInstruction

Direct Known Subclasses:

BranchInstruction, GenericInstruction, LookupSwitchInstruction, TableSwitchInstruction, WideBranchInstruction

public abstract class AInstruction
extends java.lang.Object

Abstract Java instruction.

Author:

Mathias Ricken

Constructor Summary

AInstruction()

Method Summary

abstract boolean	equals(java.lang.Object o) Return true of this instruction and the other object are equal.
abstract int[]	getBranchTargets() Return an array of target indices.
abstract byte[]	getBytecode(int pc, LineNumberTable lnt) Get the bytecode for this instruction, padded for the specified program counter value, with branch targets according to the specified line number table
abstract int	getBytecodeLength(int pc) Get the length bytecode for this instruction, padded for the specified program counter value.
static AInstruction	getCorrespondingLoad(AInstruction storeInstruction) Returns a load instruction that corresponds to the given store instruction.
static AInstruction	getCorrespondingStore(AInstruction loadInstruction) Returns a store instruction that corresponds to the given load instruction.
abstract byte	getOpcode() Get the opcode of this instruction.
abstract int	hashCode() Return hash code.
static AInstruction	makeInstruction(byte[] bytecode, int pc, int paddingPC, LineNumberTable lnt) Make an instruction from the bytecode starting at pc, using the specified padding PC and the line number table.
abstract void	setBranchTargets(int[] branchTargets) Set the branch target indices.
java.lang.String	toStringVerbose(ConstantPool cp) Return a verbose string representation.

Methods inherited from class java.lang.Object

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

Constructor Detail

AInstruction

public AInstruction()

Method Detail

getBytecode

public abstract byte[] getBytecode(int pc,
                                   LineNumberTable lnt)

Get the bytecode for this instruction, padded for the specified program counter value, with branch targets according to the specified line number table

Parameters:

pc - PC for padding

lnt - line number table for branches

Returns:

bytecode

getOpcode

public abstract byte getOpcode()

Get the opcode of this instruction.

Returns:

opcode

getBytecodeLength

public abstract int getBytecodeLength(int pc)

Get the length bytecode for this instruction, padded for the specified program counter value.

Parameters:

pc - PC for padding

Returns:

bytecode length

getBranchTargets

public abstract int[] getBranchTargets()

Return an array of target indices.

Returns:

array of target indices.

setBranchTargets

public abstract void setBranchTargets(int[] branchTargets)

Set the branch target indices.

Parameters:

branchTargets - array of target indices

makeInstruction

public static AInstruction makeInstruction(byte[] bytecode,
                                           int pc,
                                           int paddingPC,
                                           LineNumberTable lnt)

Make an instruction from the bytecode starting at pc, using the specified padding PC and the line number table.

Parameters:

bytecode - bytecode

pc - start PC in bytecode

paddingPC - PC used for padding

lnt - line number table for branches

Returns:

instruction

equals

public abstract boolean equals(java.lang.Object o)

Return true of this instruction and the other object are equal.

Overrides:

equals in class java.lang.Object

Parameters:

o - other object

Returns:

true if equal

hashCode

public abstract int hashCode()

Return hash code.

Overrides:

hashCode in class java.lang.Object

Returns:

hash code

toStringVerbose

public java.lang.String toStringVerbose(ConstantPool cp)

Return a verbose string representation.

Parameters:

cp - constant pool

Returns:

verbose string representation

getCorrespondingStore

public static AInstruction getCorrespondingStore(AInstruction loadInstruction)

Returns a store instruction that corresponds to the given load instruction.

Parameters:

loadInstruction - load instruction

Returns:

corresponding store instruction

getCorrespondingLoad

public static AInstruction getCorrespondingLoad(AInstruction storeInstruction)

Returns a load instruction that corresponds to the given store instruction.

Parameters:

storeInstruction - store instruction

Returns:

corresponding load instruction