org.zmpp.vm
Class LongInstruction

java.lang.Object
  org.zmpp.vm.AbstractInstruction
      org.zmpp.vm.LongInstruction

All Implemented Interfaces:

Instruction

public class LongInstruction
extends AbstractInstruction

This class represents instructions of type LONG, 2OP.

Version:

1.0

Author:

Wei-ju Wu

Nested Class Summary

Nested classes/interfaces inherited from class org.zmpp.vm.AbstractInstruction

AbstractInstruction.InstructionForm, AbstractInstruction.OperandCount

Field Summary

static int	OP_ADD
static int	OP_AND
static int	OP_CLEAR_ATTR
static int	OP_DEC_CHK
static int	OP_DIV
static int	OP_GET_NEXT_PROP
static int	OP_GET_PROP
static int	OP_GET_PROP_ADDR
static int	OP_INC_CHK
static int	OP_INSERT_OBJ
static int	OP_JE List of opcodes.
static int	OP_JG
static int	OP_JIN
static int	OP_JL
static int	OP_LOADB
static int	OP_LOADW
static int	OP_MOD
static int	OP_MUL
static int	OP_OR
static int	OP_SET_ATTR
static int	OP_STORE
static int	OP_SUB
static int	OP_TEST
static int	OP_TEST_ATTR

Fields inherited from class org.zmpp.vm.AbstractInstruction

FALSE, TRUE

Constructor Summary

LongInstruction(Machine machineState, AbstractInstruction.OperandCount operandCount, int opcode)
Constructor.

LongInstruction(Machine machineState, int opcode)
Constructor.

Method Summary

void	execute() Execute the instruction.
AbstractInstruction.InstructionForm	getInstructionForm() Returns the instruction's form.
AbstractInstruction.OperandCount	getOperandCount() Returns the instruction's operand count type.
boolean	isBranch() Returns true, if this instruction is a branch, false, otherwise.
boolean	storesResult() Returns true, if this instruction stores a result, false, otherwise.

Methods inherited from class org.zmpp.vm.AbstractInstruction

addOperand, branchIfTrue, branchOnTest, getBranchOffset, getLength, getMachine, getNumOperands, getOpcode, getOperand, getStoreVariable, getUnsignedValue, getValue, nextInstruction, returnFromRoutine, setBranchIfTrue, setBranchOffset, setLength, setOpcode, setStoreVariable, storeResult, throwInvalidOpcode

Methods inherited from class java.lang.Object

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

Field Detail

OP_JE

public static final int OP_JE

List of opcodes. See Z-Machine Standards document 1.0 for explanations.

See Also:

Constant Field Values

OP_JL

public static final int OP_JL

See Also:

Constant Field Values

OP_JG

public static final int OP_JG

See Also:

Constant Field Values

OP_DEC_CHK

public static final int OP_DEC_CHK

See Also:

Constant Field Values

OP_INC_CHK

public static final int OP_INC_CHK

See Also:

Constant Field Values

OP_JIN

public static final int OP_JIN

See Also:

Constant Field Values

OP_TEST

public static final int OP_TEST

See Also:

Constant Field Values

OP_OR

public static final int OP_OR

See Also:

Constant Field Values

OP_AND

public static final int OP_AND

See Also:

Constant Field Values

OP_TEST_ATTR

public static final int OP_TEST_ATTR

See Also:

Constant Field Values

OP_SET_ATTR

public static final int OP_SET_ATTR

See Also:

Constant Field Values

OP_CLEAR_ATTR

public static final int OP_CLEAR_ATTR

See Also:

Constant Field Values

OP_STORE

public static final int OP_STORE

See Also:

Constant Field Values

OP_INSERT_OBJ

public static final int OP_INSERT_OBJ

See Also:

Constant Field Values

OP_LOADW

public static final int OP_LOADW

See Also:

Constant Field Values

OP_LOADB

public static final int OP_LOADB

See Also:

Constant Field Values

OP_GET_PROP

public static final int OP_GET_PROP

See Also:

Constant Field Values

OP_GET_PROP_ADDR

public static final int OP_GET_PROP_ADDR

See Also:

Constant Field Values

OP_GET_NEXT_PROP

public static final int OP_GET_NEXT_PROP

See Also:

Constant Field Values

OP_ADD

public static final int OP_ADD

See Also:

Constant Field Values

OP_SUB

public static final int OP_SUB

See Also:

Constant Field Values

OP_MUL

public static final int OP_MUL

See Also:

Constant Field Values

OP_DIV

public static final int OP_DIV

See Also:

Constant Field Values

OP_MOD

public static final int OP_MOD

See Also:

Constant Field Values

Constructor Detail

LongInstruction

public LongInstruction(Machine machineState,
                       int opcode)

Constructor.

Parameters:

machineState - a reference to a MachineState object

opcode - the instruction's opcode

LongInstruction

public LongInstruction(Machine machineState,
                       AbstractInstruction.OperandCount operandCount,
                       int opcode)

Constructor.

Parameters:

machineState - the machine state

operandCount - the operand count

opcode - the opcode

Method Detail

execute

public void execute()

Execute the instruction.

getInstructionForm

public AbstractInstruction.InstructionForm getInstructionForm()

Returns the instruction's form.

Specified by:

getInstructionForm in class AbstractInstruction

Returns:

the instruction form

getOperandCount

public AbstractInstruction.OperandCount getOperandCount()

Returns the instruction's operand count type.

Specified by:

getOperandCount in class AbstractInstruction

Returns:

the operand count type

storesResult

public boolean storesResult()

Returns true, if this instruction stores a result, false, otherwise.

Overrides:

storesResult in class AbstractInstruction

Returns:

true if a result is stored, false otherwise

isBranch

public boolean isBranch()

Returns true, if this instruction is a branch, false, otherwise.

Overrides:

isBranch in class AbstractInstruction

Returns:

true if branch, false otherwise