edu.wisc.cs.java
Class Branch

java.lang.Object
  |
  +--edu.wisc.cs.java.Bytecode
        |
        +--edu.wisc.cs.java.Branch

public class Branch

extends Bytecode

Represents a conditional or unconditional branch instruction.

Field Summary

protected CodeLabel

target The symbolic label corresponding to the target of this branch.

Fields inherited from class edu.wisc.cs.java.Bytecode

opcode, params, wide

Constructor Summary

Branch(int opcode, CodeLabel lbl)
Creates a new branch instruction with the specified label as the target.

Branch(int op, java.io.DataInputStream in, int pc)
Constructs a new Branch object from information presumably read from a class file.

Method Summary

int	getParamBytes() Returns the number of bytes this instruction uses for parameters.
CodeLabel	getTarget() Returns the symbolic label corresponding to the target of this branch.
java.lang.String	toString() Returns a string representation of this branch instruction.
void	writeTo(java.io.DataOutputStream out, java.util.HashMap labels, int pc) Writes a branch instruction to a stream in the specified format.

Methods inherited from class edu.wisc.cs.java.Bytecode

getConstantIndex, getNBytes, getOpcode, isWide, writeTo

Methods inherited from class java.lang.Object

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

Field Detail

target

protected CodeLabel target

The symbolic label corresponding to the target of this branch.

Constructor Detail

Branch

public Branch(int op,
              java.io.DataInputStream in,
              int pc)
       throws java.io.IOException

Constructs a new Branch object from information presumably read from a class file.

Parameters:

w - true if this is to be a wide instruction, false otherwise.

op - the opcode for the new instruction.

p - an array of parameter bytes.

Branch

public Branch(int opcode,
              CodeLabel lbl)

Creates a new branch instruction with the specified label as the target.

Parameters:

opcode - the opcode for this instruction.

lbl - the target label.

Method Detail

writeTo

public void writeTo(java.io.DataOutputStream out,
                    java.util.HashMap labels,
                    int pc)
             throws java.io.IOException

Writes a branch instruction to a stream in the specified format. The pad is already expected to have been adjusted to the proper value given the pc.

Parameters:

out - a stream to which to write the data for this instruction.

labels - a map comtaining the labels in the method and their pc's.

pc - the program counter for this instruction.

Throws:

java.io.IOException - if there is a problem writing to the stream.

toString

public java.lang.String toString()

Returns a string representation of this branch instruction.

Overrides:

toString in class Bytecode

Returns:

a string representation of this branch instruction.

getTarget

public CodeLabel getTarget()

Returns the symbolic label corresponding to the target of this branch.

Returns:

the symbolic label corresponding to the target of this branch.

getParamBytes

public int getParamBytes()

Returns the number of bytes this instruction uses for parameters.

Overrides:

getParamBytes in class Bytecode

Returns:

the number of bytes this instruction uses for parameters.