Examples of org.aspectj.apache.bcel.generic.InstructionFactory

org.aspectj.apache.bcel.generic.InstructionFactory
Instances of this class may be used, e.g., to generate typed versions of instructions. Its main purpose is to be used as the byte code generating backend of a compiler. You can subclass it to add your own create methods. @version $Id: InstructionFactory.java,v 1.7 2010/08/23 20:44:10 aclement Exp $ @author M. Dahm @see Constants


    // If we are nonExpressionKind, we don't expect arguments on the stack
    // so this is moot. If our argVars happen to be null, then we know that
    // no ShadowMunger has squirrelled away our arguments, so they're still
    // on the stack.
    InstructionFactory fact = getFactory();
    if (getKind().argsOnStack() && argVars != null) {


      // Special case first (pr46298). If we are an exception handler and the instruction
      // just after the shadow is a POP then we should remove the pop. The code
      // above which generated the store instruction has already cleared the stack.
      // We also don't generate any code for the arguments in this case as it would be
      // an incorrect aload.
      if (getKind() == ExceptionHandler && range.getEnd().getNext().getInstruction().equals(InstructionConstants.POP)) {
        // easier than deleting it ...
        range.getEnd().getNext().setInstruction(InstructionConstants.NOP);
      } else {
        range.insert(BcelRenderer.renderExprs(fact, world, argVars), Range.InsideBefore);
        if (targetVar != null) {
          range.insert(BcelRenderer.renderExpr(fact, world, targetVar), Range.InsideBefore);
        }
        if (getKind() == ConstructorCall) {
          if (!world.isJoinpointArrayConstructionEnabled() || !this.getSignature().getDeclaringType().isArray()) {
            range.insert(InstructionFactory.createDup(1), Range.InsideBefore);
            range.insert(fact.createNew((ObjectType) BcelWorld.makeBcelType(getSignature().getDeclaringType())),
                Range.InsideBefore);
          }
        }
      }
    }

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      if (lazyTjpConsumers == 1) {
        return; // special case only one lazyTjpUser
      }


      InstructionFactory fact = getFactory();
      InstructionList il = new InstructionList();
      il.append(InstructionConstants.ACONST_NULL);
      il.append(thisJoinPointVar.createStore(fact));
      range.insert(il, Range.OutsideBefore);
    } else {
      appliedLazyTjpOptimization = false;
      InstructionFactory fact = getFactory();
      InstructionList il = createThisJoinPoint();
      il.append(thisJoinPointVar.createStore(fact));
      range.insert(il, Range.OutsideBefore);
    }
  }

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    return true;
  }


  InstructionList loadThisJoinPoint() {
    InstructionFactory fact = getFactory();
    InstructionList il = new InstructionList();


    if (isThisJoinPointLazy) {
      // If we're lazy, build the join point right here.
      il.append(createThisJoinPoint());

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    return il;
  }


  InstructionList createThisJoinPoint() {
    InstructionFactory fact = getFactory();
    InstructionList il = new InstructionList();


    BcelVar staticPart = getThisJoinPointStaticPartBcelVar();
    staticPart.appendLoad(il, fact);
    if (hasThis()) {
      ((BcelVar) getThisVar()).appendLoad(il, fact);
    } else {
      il.append(InstructionConstants.ACONST_NULL);
    }
    if (hasTarget()) {
      ((BcelVar) getTargetVar()).appendLoad(il, fact);
    } else {
      il.append(InstructionConstants.ACONST_NULL);
    }


    switch (getArgCount()) {
    case 0:
      il.append(fact.createInvoke("org.aspectj.runtime.reflect.Factory", "makeJP", LazyClassGen.tjpType, new Type[] {
          LazyClassGen.staticTjpType, Type.OBJECT, Type.OBJECT }, Constants.INVOKESTATIC));
      break;
    case 1:
      ((BcelVar) getArgVar(0)).appendLoadAndConvert(il, fact, world.getCoreType(ResolvedType.OBJECT));
      il.append(fact.createInvoke("org.aspectj.runtime.reflect.Factory", "makeJP", LazyClassGen.tjpType, new Type[] {
          LazyClassGen.staticTjpType, Type.OBJECT, Type.OBJECT, Type.OBJECT }, Constants.INVOKESTATIC));
      break;
    case 2:
      ((BcelVar) getArgVar(0)).appendLoadAndConvert(il, fact, world.getCoreType(ResolvedType.OBJECT));
      ((BcelVar) getArgVar(1)).appendLoadAndConvert(il, fact, world.getCoreType(ResolvedType.OBJECT));
      il.append(fact.createInvoke("org.aspectj.runtime.reflect.Factory", "makeJP", LazyClassGen.tjpType, new Type[] {
          LazyClassGen.staticTjpType, Type.OBJECT, Type.OBJECT, Type.OBJECT, Type.OBJECT }, Constants.INVOKESTATIC));
      break;
    default:
      il.append(makeArgsObjectArray());
      il.append(fact.createInvoke("org.aspectj.runtime.reflect.Factory", "makeJP", LazyClassGen.tjpType, new Type[] {
          LazyClassGen.staticTjpType, Type.OBJECT, Type.OBJECT, new ArrayType(Type.OBJECT, 1) }, Constants.INVOKESTATIC));
      break;
    }


    return il;

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  // }
  // }
  // }


  private InstructionList makeArgsObjectArray() {
    InstructionFactory fact = getFactory();
    BcelVar arrayVar = genTempVar(UnresolvedType.OBJECTARRAY);
    final InstructionList il = new InstructionList();
    int alen = getArgCount();
    il.append(Utility.createConstant(fact, alen));
    il.append(fact.createNewArray(Type.OBJECT, (short) 1));
    arrayVar.appendStore(il, fact);


    int stateIndex = 0;
    for (int i = 0, len = getArgCount(); i < len; i++) {
      arrayVar.appendConvertableArrayStore(il, fact, stateIndex, (BcelVar) getArgVar(i));

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    thisVar = new BcelVar(getThisType().resolve(world), 0);
    thisVar.setPositionInAroundState(0);
  }


  public void initializeTargetVar() {
    InstructionFactory fact = getFactory();
    if (targetVar != null) {
      return;
    }
    if (getKind().isTargetSameAsThis()) {
      if (hasThis()) {

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  public void ensureInitializedArgVar(int argNumber) {
    if (allArgVarsInitialized || (argVars != null && argVars[argNumber] != null)) {
      return;
    }
    InstructionFactory fact = getFactory();
    int len = getArgCount();
    if (argVars == null) {
      argVars = new BcelVar[len];
    }

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   */
  public void initializeArgVars() {
    if (allArgVarsInitialized) {
      return;
    }
    InstructionFactory fact = getFactory();
    int len = getArgCount();
    if (argVars == null) {
      argVars = new BcelVar[len];
    }
    int positionOffset = (hasTarget() ? 1 : 0) + ((hasThis() && !getKind().isTargetSameAsThis()) ? 1 : 0);

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    // if the shadow is GUARANTEED empty (i.e., there's NOTHING, not even
    // a shadow, inside me).
    if (getRange().getStart().getNext() == getRange().getEnd()) {
      return;
    }
    InstructionFactory fact = getFactory();
    InstructionList handler = new InstructionList();
    BcelVar exceptionVar = genTempVar(catchType);
    exceptionVar.appendStore(handler, fact);


    // pr62642
    // I will now jump through some firey BCEL hoops to generate a trivial bit of code:
    // if (exc instanceof ExceptionInInitializerError)
    // throw (ExceptionInInitializerError)exc;
    if (this.getEnclosingMethod().getName().equals("<clinit>")) {
      ResolvedType eiieType = world.resolve("java.lang.ExceptionInInitializerError");
      ObjectType eiieBcelType = (ObjectType) BcelWorld.makeBcelType(eiieType);
      InstructionList ih = new InstructionList(InstructionConstants.NOP);
      handler.append(exceptionVar.createLoad(fact));
      handler.append(fact.createInstanceOf(eiieBcelType));
      InstructionBranch bi = InstructionFactory.createBranchInstruction(Constants.IFEQ, ih.getStart());
      handler.append(bi);
      handler.append(exceptionVar.createLoad(fact));
      handler.append(fact.createCheckCast(eiieBcelType));
      handler.append(InstructionConstants.ATHROW);
      handler.append(ih);
    }


    InstructionList endHandler = new InstructionList(exceptionVar.createLoad(fact));

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    // a shadow, inside me).
    if (getRange().getStart().getNext() == getRange().getEnd()) {
      return;
    }


    InstructionFactory fact = getFactory();
    InstructionList handler = new InstructionList();
    InstructionList rtExHandler = new InstructionList();
    BcelVar exceptionVar = genTempVar(catchType);


    handler.append(fact.createNew(NameMangler.SOFT_EXCEPTION_TYPE));
    handler.append(InstructionFactory.createDup(1));
    handler.append(exceptionVar.createLoad(fact));
    handler.append(fact.createInvoke(NameMangler.SOFT_EXCEPTION_TYPE, "<init>", Type.VOID, new Type[] { Type.THROWABLE },
        Constants.INVOKESPECIAL)); // ??? special
    handler.append(InstructionConstants.ATHROW);


    // ENH 42737
    exceptionVar.appendStore(rtExHandler, fact);
    // aload_1
    rtExHandler.append(exceptionVar.createLoad(fact));
    // instanceof class java/lang/RuntimeException
    rtExHandler.append(fact.createInstanceOf(new ObjectType("java.lang.RuntimeException")));
    // ifeq go to new SOFT_EXCEPTION_TYPE instruction
    rtExHandler.append(InstructionFactory.createBranchInstruction(Constants.IFEQ, handler.getStart()));
    // aload_1
    rtExHandler.append(exceptionVar.createLoad(fact));
    // athrow

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