Examples of org.apache.bcel.generic.LocalVariableGen

org.apache.bcel.generic.LocalVariableGen
This class represents a local variable within a method. It contains its scope, name and type. The generated LocalVariable object can be obtained with getLocalVariable which needs the instruction list and the constant pool as parameters. @version $Id: LocalVariableGen.java,v 1.2 2001/12/14 18:32:54 mdahm Exp $ @author M. Dahm @see LocalVariable @see MethodGen

    public void storeObject() {
        if (m_objectType == null) {
            throw new IllegalStateException("Internal error - no object type");
        } else {
            if (m_objectSlot < 0) {
                LocalVariableGen var = createLocal("obj",
                    ClassItem.typeFromName(m_objectType));
                m_objectSlot = var.getIndex();
            } else {
                appendCreateCast(m_objectType);
                appendStoreLocal(m_objectSlot);
            }
        }

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        if (name == null) {
             name = "var" + m_generator.getLocalVariables().length;
        }
        
        // allocation local and store value
        LocalVariableGen var = m_generator.addLocalVariable
            (name, type, getLastInstruction(), null);
        append(InstructionFactory.createStore(type, var.getIndex()));
        
        // save type information for local variable slot
        int slot = var.getIndex();
        while (slot >= m_localTypes.size()) {
            m_localTypes.add(null);
        }
        m_localTypes.set(slot, type.toString());

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     * @param name local variable name
     * @param type variable type
     * @return local variable slot number
     */
    public int addLocal(String name, Type type) {
        LocalVariableGen var = createLocal(name, type);
        return var.getIndex();
    }

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     */
    public int defineSlot(Object obj, Type type) {
        if (m_slotMap == null) {
            m_slotMap = new HashMap();
        }
        LocalVariableGen var = createLocal("var" + m_slotMap.size(), type);
        m_slotMap.put(obj, var);
        return var.getIndex();
    }

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     * none
     */


    public int getSlot(Object obj) {
        if (m_slotMap != null) {
            LocalVariableGen var = (LocalVariableGen)m_slotMap.get(obj);
            if (var != null) {
                return var.getIndex();
            }
        }
        return -1;
    }

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     * @param obj owning object of slot
     */


    public void freeSlot(Object obj) {
        if (m_slotMap != null) {
            LocalVariableGen var = (LocalVariableGen)m_slotMap.get(obj);
            if (var != null) {
                var.setEnd(getLastInstruction());
                m_slotMap.remove(obj);
            }
        }
    }

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      il.append(DUP);
      il.append(DUP);
      il.append(new INVOKESPECIAL(index));
      
      // Store new Handler into a local variable
      final LocalVariableGen handler =
    methodGen.addLocalVariable("rt_to_string_handler", 
             Util.getJCRefType(STRING_VALUE_HANDLER_SIG),
             null, null);
      il.append(new ASTORE(handler.getIndex()));


      // Call the method that implements this result tree
      index = cpg.addMethodref(className, _methodName,
             "("+DOM_INTF_SIG+TRANSLET_OUTPUT_SIG+")V");
      il.append(new INVOKEVIRTUAL(index));
      
      // Restore new handler and call getValue()
      il.append(new ALOAD(handler.getIndex()));
      index = cpg.addMethodref(STRING_VALUE_HANDLER,
             "getValue",
             "()" + STRING_SIG);
      il.append(new INVOKEVIRTUAL(index));
  }

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  if (_methodName == null) {
      il.append(NOP);
  }
  else {
      LocalVariableGen domBuilder, newDom;
      final String className = classGen.getClassName();
      final int current = methodGen.getLocalIndex("current");


      // Push required parameters 
      il.append(classGen.loadTranslet());
      if (classGen.isExternal()) {
    il.append(new CHECKCAST(cpg.addClass(className)));
      }
      il.append(methodGen.loadDOM());


      // Create new instance of DOM class 
      int index = cpg.addMethodref(DOM_IMPL, "<init>", "(I)V");
      il.append(new NEW(cpg.addClass(DOM_IMPL)));
      il.append(DUP);
      il.append(DUP);
      il.append(new PUSH(cpg, RTF_INITIAL_SIZE));
      il.append(new INVOKESPECIAL(index));
      
      // Store new DOM into a local variable
      newDom = methodGen.addLocalVariable("rt_to_reference_dom", 
            Util.getJCRefType(DOM_INTF_SIG),
            null, null);
      il.append(new CHECKCAST(cpg.addClass(DOM_INTF_SIG)));
      il.append(new ASTORE(newDom.getIndex()));


      // Overwrite old handler with DOM handler
      index = cpg.addMethodref(DOM_IMPL,
             "getOutputDomBuilder", 
             "()" + TRANSLET_OUTPUT_SIG);
      il.append(new INVOKEVIRTUAL(index));
      il.append(DUP);
      il.append(DUP);


      // Store DOM handler in a local in order to call endDocument()
      domBuilder =
    methodGen.addLocalVariable("rt_to_reference_handler", 
             Util.getJCRefType(TRANSLET_OUTPUT_SIG),
             null, null);
      il.append(new ASTORE(domBuilder.getIndex()));


      // Call startDocument on the new handler
      index = cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE, 
                "startDocument", "()V");
      il.append(new INVOKEINTERFACE(index, 1));


      // Call the method that implements this result tree
      index = cpg.addMethodref(className,
             _methodName,
             "("
             + DOM_INTF_SIG
             + TRANSLET_OUTPUT_SIG
             +")V");
      il.append(new INVOKEVIRTUAL(index));


      // Call endDocument on the DOM handler
      il.append(new ALOAD(domBuilder.getIndex()));
      index = cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE, 
                "endDocument", "()V");
      il.append(new INVOKEINTERFACE(index, 1));


      // Push the new DOM on the stack

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  final ConstantPoolGen cpg = classGen.getConstantPool();
  final InstructionList il = methodGen.getInstructionList();


  if (_left != null) {
      if (_left instanceof StepPattern) {
    final LocalVariableGen local = 
        // absolute path pattern temporary
        methodGen.addLocalVariable2("apptmp", 
            Util.getJCRefType(NODE_SIG),
            il.getEnd());
    il.append(DUP);
    il.append(new ISTORE(local.getIndex()));
    _left.translate(classGen, methodGen);
    il.append(methodGen.loadDOM());
    local.setEnd(il.append(new ILOAD(local.getIndex())));
    methodGen.removeLocalVariable(local);
      }
      else {
    _left.translate(classGen, methodGen);
      }

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  /* 
   * The scope of this local var must be the entire method since
   * a another pattern may decide to jump back into the loop
   */
  final LocalVariableGen local =
      methodGen.addLocalVariable2("app", Util.getJCRefType(NODE_SIG),
          il.getEnd());


  final org.apache.bcel.generic.Instruction loadLocal =
      new ILOAD(local.getIndex());
  final org.apache.bcel.generic.Instruction storeLocal =
      new ISTORE(local.getIndex());


  if (_right instanceof StepPattern) {
      il.append(DUP);
      il.append(storeLocal);
      _right.translate(classGen, methodGen);
      il.append(methodGen.loadDOM());
      il.append(loadLocal);
  }
  else {
      _right.translate(classGen, methodGen);


      if (_right instanceof AncestorPattern) {
    il.append(methodGen.loadDOM());
    il.append(SWAP);
      }
  }


  if (_left != null) {
      final int getParent = cpg.addInterfaceMethodref(DOM_INTF,
                  GET_PARENT,
                  GET_PARENT_SIG);
      parent = il.append(new INVOKEINTERFACE(getParent, 2));
      
      il.append(DUP);
      il.append(storeLocal);
      _falseList.add(il.append(new IFEQ(null)));
      il.append(loadLocal);


      _left.translate(classGen, methodGen);


      final SyntaxTreeNode p = getParent();
      if (p == null || p instanceof Instruction ||
    p instanceof TopLevelElement) 
      {
    // do nothing
      }
      else {
    il.append(loadLocal);
      }


      final BranchHandle exit = il.append(new GOTO(null));
      _loop = il.append(methodGen.loadDOM());
      il.append(loadLocal);
      local.setEnd(_loop);
      il.append(new GOTO(parent));
      exit.setTarget(il.append(NOP));
      _left.backPatchFalseList(_loop);


      _trueList.append(_left._trueList);

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