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

org.aspectj.apache.bcel.generic.BranchInstruction
Abstract super class for branching instructions like GOTO, IFEQ, etc.. Branch instructions may have a variable length, namely GOTO, JSR, LOOKUPSWITCH and TABLESWITCH. @see InstructionList @version $Id: BranchInstruction.java,v 1.2 2004/11/19 16:45:19 aclement Exp $ @author M. Dahm

        dest = dest.getNext(), src = src.getNext()) {
      Instruction inst = dest.getInstruction();
      
      // retarget branches
      if (inst instanceof BranchInstruction) {
        BranchInstruction branch = (BranchInstruction) inst;
        InstructionHandle oldTarget = branch.getTarget();
        InstructionHandle newTarget =
          (InstructionHandle) srcToDest.get(oldTarget);
        if (newTarget == null) {
          // assert this is a GOTO
          // this was a return instruction we previously replaced
        } else {
          branch.setTarget(newTarget);
          if (branch instanceof Select) {
            Select select = (Select) branch;
            InstructionHandle[] oldTargets = select.getTargets();
            for (int k = oldTargets.length - 1; k >= 0; k--) {
              select.setTarget(

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            InstructionFactory fact = gen.getFactory();


            // getfield
            body.append(InstructionConstants.ALOAD_0);
            body.append(Utility.createGet(fact, munger.getDelegate(weaver.getLazyClassGen().getType())));
            BranchInstruction ifNonNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
            body.append(ifNonNull);
            InstructionHandle ifNonNullElse = body.append(InstructionConstants.ALOAD_0);
            body.append(fact.createNew(munger.getImplClassName()));
            body.append(InstructionConstants.DUP);
            body.append(fact.createInvoke(munger.getImplClassName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
            body.append(Utility.createSet(fact, munger.getDelegate(weaver.getLazyClassGen().getType())));
            ifNonNull.setTarget(ifNonNullElse);
            body.append(InstructionConstants.ALOAD_0);
            body.append(Utility.createGet(fact, munger.getDelegate(weaver.getLazyClassGen().getType())));


            //args
            int pos = 0;

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      // Now we add it to the new instruction list.
            InstructionHandle freshIh;
            if (freshI instanceof BranchInstruction) {
        //If it's a targeting instruction,
          // update the target(s) to point to the new copy instead of the old copy.
              BranchInstruction oldBranch = (BranchInstruction) oldI;
              BranchInstruction freshBranch = (BranchInstruction) freshI;
        InstructionHandle oldTarget = oldBranch.getTarget();
        oldTarget.removeTargeter(oldBranch);
        oldTarget.addTargeter(freshBranch);
        if (freshBranch instanceof Select) {
          Select oldSelect = (Select) oldI;

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            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));
          BranchInstruction bi = 
                InstructionFactory.createBranchInstruction(Constants.IFEQ,ih.getStart());
          handler.append(bi);
          handler.append(exceptionVar.createLoad(fact));
          handler.append(fact.createCheckCast(eiieBcelType));
          handler.append(InstructionConstants.ATHROW);

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        flagAsSynthetic(method, false);
        classGen.addMethodGen(method);


        InstructionList il = method.getBody();
        il.append(Utility.createGet(factory, AjcMemberMaker.perSingletonField(aspectType)));
        BranchInstruction ifNotNull = InstructionFactory.createBranchInstruction(Constants.IFNONNULL, null);
        il.append(ifNotNull);
        il.append(factory.createNew(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName()));
        il.append(InstructionConstants.DUP);
        il.append(new PUSH(classGen.getConstantPoolGen(), aspectType.getName()));
        il.append(Utility.createGet(factory, AjcMemberMaker.initFailureCauseField(aspectType)));
        il.append(factory.createInvoke(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName(), "<init>", Type.VOID, new Type[] { Type.STRING, new ObjectType("java.lang.Throwable") }, Constants.INVOKESPECIAL));
        il.append(InstructionConstants.ATHROW);
        InstructionHandle ifElse = il.append(Utility.createGet(factory, AjcMemberMaker.perSingletonField(aspectType)));
        il.append(InstructionFactory.createReturn(Type.OBJECT));
        ifNotNull.setTarget(ifElse);
    }

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        flagAsSynthetic(method, false);
        classGen.addMethodGen(method);


        InstructionList il = method.getBody();
        il.append(Utility.createGet(factory, AjcMemberMaker.perSingletonField(aspectType)));
        BranchInstruction ifNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
        il.append(ifNull);
        il.append(new PUSH(classGen.getConstantPoolGen(), true));
        il.append(InstructionFactory.createReturn(Type.INT));
        InstructionHandle ifElse = il.append(new PUSH(classGen.getConstantPoolGen(), false));
        il.append(InstructionFactory.createReturn(Type.INT));
        ifNull.setTarget(ifElse);
    }

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        // patch <clinit> to delegate to ajc$postClinit at the end
        LazyMethodGen clinit = classGen.getStaticInitializer();
        il = new InstructionList();
        InstructionHandle tryStart = il.append(factory.createInvoke(aspectType.getName(), NameMangler.AJC_POST_CLINIT_NAME, Type.VOID, Type.NO_ARGS, Constants.INVOKESTATIC));
        BranchInstruction tryEnd = InstructionFactory.createBranchInstruction(Constants.GOTO, null);
        il.append(tryEnd);
        InstructionHandle handler = il.append(InstructionConstants.ASTORE_0);
        il.append(InstructionConstants.ALOAD_0);
        il.append(Utility.createSet(factory, AjcMemberMaker.initFailureCauseField(aspectType)));
        il.append(InstructionFactory.createReturn(Type.VOID));
        tryEnd.setTarget(il.getEnd());


        // replace the original "return" with a "nop"
        //TODO AV - a bit odd, looks like Bcel alters bytecode and has a IMPDEP1 in its representation
        if (clinit.getBody().getEnd().getInstruction().getOpcode() == Constants.IMPDEP1) {
            clinit.getBody().getEnd().getPrev().setInstruction(new NOP());

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        classGen.addMethodGen(method);


        InstructionList il = method.getBody();
        il.append(InstructionConstants.ALOAD_0);
        il.append(factory.createInstanceOf(interfaceType));
        BranchInstruction ifEq = InstructionFactory.createBranchInstruction(Constants.IFEQ, null);
        il.append(ifEq);
        il.append(InstructionConstants.ALOAD_0);
        il.append(factory.createCheckCast(interfaceType));
        il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceGet(aspectType)));
        il.append(InstructionConstants.DUP);
        BranchInstruction ifNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
        il.append(ifNull);
        il.append(InstructionFactory.createReturn(BcelWorld.makeBcelType(aspectType)));
        InstructionHandle ifNullElse = il.append(new POP());
        ifNull.setTarget(ifNullElse);
        InstructionHandle ifEqElse = il.append(factory.createNew(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName()));
        ifEq.setTarget(ifEqElse);
        il.append(InstructionConstants.DUP);
        il.append(factory.createInvoke(AjcMemberMaker.NO_ASPECT_BOUND_EXCEPTION.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
        il.append(new ATHROW());

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        classGen.addMethodGen(method);


        InstructionList il = method.getBody();
        il.append(InstructionConstants.ALOAD_0);
        il.append(factory.createInstanceOf(interfaceType));
        BranchInstruction ifEq = InstructionFactory.createBranchInstruction(Constants.IFEQ, null);
        il.append(ifEq);
        il.append(InstructionConstants.ALOAD_0);
        il.append(factory.createCheckCast(interfaceType));
        il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceGet(aspectType)));
        BranchInstruction ifNull = InstructionFactory.createBranchInstruction(Constants.IFNULL, null);
        il.append(ifNull);
        il.append(InstructionConstants.ICONST_1);
        il.append(InstructionFactory.createReturn(Type.INT));
        InstructionHandle ifEqElse = il.append(InstructionConstants.ICONST_0);
        ifEq.setTarget(ifEqElse);
        ifNull.setTarget(ifEqElse);
        il.append(InstructionFactory.createReturn(Type.INT));
    }

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        classGen.addMethodGen(method);


        InstructionList il = method.getBody();
        il.append(InstructionConstants.ALOAD_0);
        il.append(factory.createInstanceOf(interfaceType));
        BranchInstruction ifEq = InstructionFactory.createBranchInstruction(Constants.IFEQ, null);
        il.append(ifEq);
        il.append(InstructionConstants.ALOAD_0);
        il.append(factory.createCheckCast(interfaceType));
        il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceGet(aspectType)));
        BranchInstruction ifNonNull = InstructionFactory.createBranchInstruction(Constants.IFNONNULL, null);
        il.append(ifNonNull);
        il.append(InstructionConstants.ALOAD_0);
        il.append(factory.createCheckCast(interfaceType));
        il.append(factory.createNew(aspectType.getName()));
        il.append(InstructionConstants.DUP);
        il.append(factory.createInvoke(aspectType.getName(), "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
        il.append(Utility.createInvoke(factory, Constants.INVOKEINTERFACE, AjcMemberMaker.perObjectInterfaceSet(aspectType)));
        InstructionHandle end = il.append(InstructionFactory.createReturn(Type.VOID));
        ifEq.setTarget(end);
        ifNonNull.setTarget(end);
    }

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