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package com.sun.org.apache.bcel.internal.generic;

import java.io.DataOutputStream;
import java.io.IOException;

GOTO - Branch always (to relative offset, not absolute address)
Version:$Id: GOTO.java 1749603 2016-06-21 20:50:19Z ggregory $
/** * GOTO - Branch always (to relative offset, not absolute address) * * @version $Id: GOTO.java 1749603 2016-06-21 20:50:19Z ggregory $ */
public class GOTO extends GotoInstruction implements VariableLengthInstruction {
Empty constructor needed for the Class.newInstance() statement in Instruction.readInstruction(). Not to be used otherwise.
/** * Empty constructor needed for the Class.newInstance() statement in * Instruction.readInstruction(). Not to be used otherwise. */
GOTO() { } public GOTO(final InstructionHandle target) { super(com.sun.org.apache.bcel.internal.Const.GOTO, target); }
Dump instruction as byte code to stream out.
Params:
  • out – Output stream
/** * Dump instruction as byte code to stream out. * @param out Output stream */
@Override public void dump( final DataOutputStream out ) throws IOException { super.setIndex(getTargetOffset()); final short _opcode = getOpcode(); if (_opcode == com.sun.org.apache.bcel.internal.Const.GOTO) { super.dump(out); } else { // GOTO_W super.setIndex(getTargetOffset()); out.writeByte(_opcode); out.writeInt(super.getIndex()); } }
Called in pass 2 of InstructionList.setPositions() in order to update the branch target, that may shift due to variable length instructions.
Params:
  • offset – additional offset caused by preceding (variable length) instructions
  • max_offset – the maximum offset that may be caused by these instructions
Returns:additional offset caused by possible change of this instruction's length
/** * Called in pass 2 of InstructionList.setPositions() in order to update * the branch target, that may shift due to variable length instructions. * * @param offset additional offset caused by preceding (variable length) instructions * @param max_offset the maximum offset that may be caused by these instructions * @return additional offset caused by possible change of this instruction's length */
@Override protected int updatePosition( final int offset, final int max_offset ) { final int i = getTargetOffset(); // Depending on old position value setPosition(getPosition() + offset); // Position may be shifted by preceding expansions if (Math.abs(i) >= (Short.MAX_VALUE - max_offset)) { // to large for short (estimate) super.setOpcode(com.sun.org.apache.bcel.internal.Const.GOTO_W); final short old_length = (short) super.getLength(); super.setLength(5); return super.getLength() - old_length; } return 0; }
Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
Params:
  • v – Visitor object
/** * Call corresponding visitor method(s). The order is: * Call visitor methods of implemented interfaces first, then * call methods according to the class hierarchy in descending order, * i.e., the most specific visitXXX() call comes last. * * @param v Visitor object */
@Override public void accept( final Visitor v ) { v.visitVariableLengthInstruction(this); v.visitUnconditionalBranch(this); v.visitBranchInstruction(this); v.visitGotoInstruction(this); v.visitGOTO(this); } }