edu.arizona.cs.mbel.instructions
Class LDARG

java.lang.Object
  edu.arizona.cs.mbel.instructions.Instruction
      edu.arizona.cs.mbel.instructions.LDARG

All Implemented Interfaces:

ShortFormInstruction

public class LDARG

extends Instruction

implements ShortFormInstruction

Load argument.
Stack transition:
... --> ..., value

Field Summary

static int	LDARG
static int	LDARG_0
static int	LDARG_1
static int	LDARG_2
static int	LDARG_3
static int	LDARG_S
protected static int[]	OPCODE_LIST

Constructor Summary

LDARG(boolean shortF, int num)
Makes a LDARG object with the given argument number, possibly in short form (only for ldarg and ldarg.s)

LDARG(int op)
Makes a LDARG object corresponding to the given opcode (only to be used for ldarg.0 -- ldarg.3)

LDARG(int opcode, ClassParser parse)

Method Summary

protected void	emit(ByteBuffer buffer, ClassEmitter emitter) Writes the instruction to the given buffer in raw byte form
boolean	equals(java.lang.Object o)
int	getArgumentNumber()
int	getLength() Returns the length in bytes of this instruction, as would be found on disk.
java.lang.String	getName() Returns the string representation of this instruction (may vary instance-to-instance)
boolean	hasArgument() Returns true iff this ldarg instruction is one of the types that has an explicit argument (i.e. ldarg or ldarg.s)
boolean	isShort()

Methods inherited from class edu.arizona.cs.mbel.instructions.Instruction

getOpcode, readInstruction, toString

Methods inherited from class java.lang.Object

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

Field Detail

LDARG

public static final int LDARG

See Also:

Constant Field Values

LDARG_S

public static final int LDARG_S

See Also:

Constant Field Values

LDARG_0

public static final int LDARG_0

See Also:

Constant Field Values

LDARG_1

public static final int LDARG_1

See Also:

Constant Field Values

LDARG_2

public static final int LDARG_2

See Also:

Constant Field Values

LDARG_3

public static final int LDARG_3

See Also:

Constant Field Values

OPCODE_LIST

protected static final int[] OPCODE_LIST

Constructor Detail

LDARG

public LDARG(int op)
      throws InstructionInitException

Makes a LDARG object corresponding to the given opcode (only to be used for ldarg.0 -- ldarg.3)

Parameters:

op - the opcode

LDARG

public LDARG(boolean shortF,
             int num)
      throws InstructionInitException

Makes a LDARG object with the given argument number, possibly in short form (only for ldarg and ldarg.s)

Parameters:

shortF - true iff this is a short form instruction (i.e. 0<=num<256)

num - the argument number

LDARG

public LDARG(int opcode,
             ClassParser parse)
      throws java.io.IOException,
             InstructionInitException

Method Detail

hasArgument

public boolean hasArgument()

Returns true iff this ldarg instruction is one of the types that has an explicit argument (i.e. ldarg or ldarg.s)

isShort

public boolean isShort()

Specified by:

isShort in interface ShortFormInstruction

getArgumentNumber

public int getArgumentNumber()

getName

public java.lang.String getName()

Description copied from class: Instruction

Returns the string representation of this instruction (may vary instance-to-instance)

Specified by:

getName in class Instruction

Returns:

a string representing this instruction (i.e. "cpblk")

getLength

public int getLength()

Description copied from class: Instruction

Returns the length in bytes of this instruction, as would be found on disk. This value includes any prefixes prepended to this instruction.

Overrides:

getLength in class Instruction

emit

protected void emit(ByteBuffer buffer,
                    ClassEmitter emitter)

Description copied from class: Instruction

Writes the instruction to the given buffer in raw byte form

Overrides:

emit in class Instruction

Parameters:

buffer - the buffer to write to

emitter - a ClassEmitter for reconciling references to tokens

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class Instruction