Examples of org.apache.bcel.generic.BranchHandle

org.apache.bcel.generic.BranchHandle
BranchHandle is returned by specialized InstructionList.append() whenever a BranchInstruction is appended. This is useful when the target of this instruction is not known at time of creation and must be set later via setTarget(). @see InstructionHandle @see Instruction @see InstructionList @version $Id: BranchHandle.java,v 1.1.1.1 2001/10/29 20:00:06 jvanzyl Exp $ @author M. Dahm

     *
     * @param src object responsible for generating branch
     * @return wrapper for appended unconditional branch
     */
    public BranchWrapper appendUnconditionalBranch(Object src) {
        BranchHandle hand = m_instructionList.append(new GOTO(null));
        setTarget(hand);
        BranchWrapper wrapper =
            new BranchWrapper(hand, m_stackState.toArray(), src);
        m_stackState = null;
        return wrapper;

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     * @param src object responsible for generating branch
     * @return wrapper for appended conditional branch
     */
    public BranchWrapper appendIFEQ(Object src) {
        verifyStack("int");
        BranchHandle hand = m_instructionList.append(new IFEQ(null));
        setTarget(hand);
        m_stackState.pop();
        return new BranchWrapper(hand, m_stackState.toArray(), src);
    }

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     * @param src object responsible for generating branch
     * @return wrapper for appended conditional branch
     */
    public BranchWrapper appendIFGE(Object src) {
        verifyStack("int");
        BranchHandle hand = m_instructionList.append(new IFGE(null));
        setTarget(hand);
        m_stackState.pop();
        return new BranchWrapper(hand, m_stackState.toArray(), src);
    }

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     * @param src object responsible for generating branch
     * @return wrapper for appended conditional branch
     */
    public BranchWrapper appendIFLT(Object src) {
        verifyStack("int");
        BranchHandle hand = m_instructionList.append(new IFLT(null));
        setTarget(hand);
        m_stackState.pop();
        return new BranchWrapper(hand, m_stackState.toArray(), src);
    }

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     * @param src object responsible for generating branch
     * @return wrapper for appended conditional branch
     */
    public BranchWrapper appendIFNE(Object src) {
        verifyStack("int");
        BranchHandle hand = m_instructionList.append(new IFNE(null));
        setTarget(hand);
        m_stackState.pop();
        return new BranchWrapper(hand, m_stackState.toArray(), src);
    }

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     * @param src object responsible for generating branch
     * @return wrapper for appended conditional branch
     */
    public BranchWrapper appendIFNONNULL(Object src) {
        verifyStackObject();
        BranchHandle hand = m_instructionList.append(new IFNONNULL(null));
        setTarget(hand);
        m_stackState.pop();
        return new BranchWrapper(hand, m_stackState.toArray(), src);
    }

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     * @param src object responsible for generating branch
     * @return wrapper for appended conditional branch
     */
    public BranchWrapper appendIFNULL(Object src) {
        verifyStackObject();
        BranchHandle hand = m_instructionList.append(new IFNULL(null));
        setTarget(hand);
        m_stackState.pop();
        return new BranchWrapper(hand, m_stackState.toArray(), src);
    }

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     * @param src object responsible for generating branch
     * @return wrapper for appended conditional branch
     */
    public BranchWrapper appendIF_ICMPNE(Object src) {
        verifyStack("int", "int");
        BranchHandle hand = m_instructionList.append(new IF_ICMPNE(null));
        setTarget(hand);
        m_stackState.pop(2);
        return new BranchWrapper(hand, m_stackState.toArray(), src);
    }

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    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, 
          BooleanType type) {
  final InstructionList il = methodGen.getInstructionList();
  FlowList falsel = translateToDesynthesized(classGen, methodGen, type);
  il.append(ICONST_1);
  final BranchHandle truec = il.append(new GOTO(null));
  falsel.backPatch(il.append(ICONST_0));
  truec.setTarget(il.append(NOP));
    }

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    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, 
          StringType type) {
  final InstructionList il = methodGen.getInstructionList();
  getFirstNode(classGen, methodGen);
  il.append(DUP);
  final BranchHandle falsec = il.append(new IFEQ(null));
  Type.Node.translateTo(classGen, methodGen, type);
  final BranchHandle truec = il.append(new GOTO(null));
  falsec.setTarget(il.append(POP));
  il.append(new PUSH(classGen.getConstantPool(), ""));
  truec.setTarget(il.append(NOP));
    }

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