Package com.tonic.analysis.instruction

Class DConstInstruction

java.lang.Object

com.tonic.analysis.instruction.Instruction

com.tonic.analysis.instruction.DConstInstruction

public class DConstInstruction
extends Instruction

Represents the JVM DCONST_0 and DCONST_1 instructions.

Constructor Summary

Constructors

Constructor	Description
DConstInstruction(int opcode, int offset, double value)	Constructs a DConstInstruction.

Method Summary

Modifier and Type	Method	Description
void	accept(AbstractBytecodeVisitor visitor)	Accepts a visitor for bytecode analysis.
int	getLocalChange()	Returns the change in local variables caused by this instruction.
int	getStackChange()	Returns the change in stack size caused by this instruction.
double	getValue()	Returns the constant value pushed onto the stack.
String	toString()	Returns a string representation of the instruction.
void	write(DataOutputStream dos)	Writes the DCONST_* opcode to the DataOutputStream.

Methods inherited from class com.tonic.analysis.instruction.Instruction

getLength, getOffset, getOpcode, setOffset

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DConstInstruction

public DConstInstruction(int opcode,
                         int offset,
                         double value)

Constructs a DConstInstruction.

Parameters:

opcode - The opcode of the instruction.

offset - The bytecode offset of the instruction.

value - The double constant value.

Method Detail

accept

public void accept(AbstractBytecodeVisitor visitor)

Description copied from class: Instruction

Accepts a visitor for bytecode analysis.

Specified by:

accept in class Instruction

Parameters:

visitor - The visitor to accept.

write

public void write(DataOutputStream dos)
           throws IOException

Writes the DCONST_* opcode to the DataOutputStream.

Specified by:

write in class Instruction

Parameters:

dos - The DataOutputStream to write to.

Throws:

IOException - If an I/O error occurs.

getStackChange

public int getStackChange()

Returns the change in stack size caused by this instruction.

Specified by:

getStackChange in class Instruction

Returns:

The stack size change (pushes a double, which occupies two stack slots).

getLocalChange

public int getLocalChange()

Returns the change in local variables caused by this instruction.

Specified by:

getLocalChange in class Instruction

Returns:

The local variables size change (none).

getValue

public double getValue()

Returns the constant value pushed onto the stack.

Returns:

The double constant.

toString

public String toString()

Returns a string representation of the instruction.

Overrides:

toString in class Instruction

Returns:

The mnemonic and value of the instruction.