org.zmpp.vm
Class Short0Instruction

java.lang.Object
  org.zmpp.vm.AbstractInstruction
      org.zmpp.vm.Short0Instruction

All Implemented Interfaces:

Instruction

public class Short0Instruction
extends AbstractInstruction

This class represents instructions of type SHORT, 0OP.

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_NEW_LINE
static int	OP_NOP
static int	OP_POP
static int	OP_QUIT
static int	OP_RESTART
static int	OP_RESTORE
static int	OP_RET_POPPED
static int	OP_RFALSE
static int	OP_RTRUE
static int	OP_SAVE
static int	OP_SHOW_STATUS
static int	OP_VERIFY

Fields inherited from class org.zmpp.vm.AbstractInstruction

FALSE, TRUE

Constructor Summary

Short0Instruction(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.

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, storesResult, throwInvalidOpcode

Methods inherited from class java.lang.Object

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

Field Detail

OP_RTRUE

public static final int OP_RTRUE

See Also:

Constant Field Values

OP_RFALSE

public static final int OP_RFALSE

See Also:

Constant Field Values

OP_NOP

public static final int OP_NOP

See Also:

Constant Field Values

OP_SAVE

public static final int OP_SAVE

See Also:

Constant Field Values

OP_RESTORE

public static final int OP_RESTORE

See Also:

Constant Field Values

OP_RESTART

public static final int OP_RESTART

See Also:

Constant Field Values

OP_RET_POPPED

public static final int OP_RET_POPPED

See Also:

Constant Field Values

OP_POP

public static final int OP_POP

See Also:

Constant Field Values

OP_QUIT

public static final int OP_QUIT

See Also:

Constant Field Values

OP_NEW_LINE

public static final int OP_NEW_LINE

See Also:

Constant Field Values

OP_SHOW_STATUS

public static final int OP_SHOW_STATUS

See Also:

Constant Field Values

OP_VERIFY

public static final int OP_VERIFY

See Also:

Constant Field Values

Constructor Detail

Short0Instruction

public Short0Instruction(Machine machineState,
                         int opcode)

Constructor.

Parameters:

machineState - a reference to the MachineState object

opcode - the instruction's 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

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