Package org.objectweb.asm.tree

Examples of org.objectweb.asm.tree.AbstractInsnNode

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    Analyzer a = new Analyzer(new IsNullInterpreter());
    a.analyze(owner, mn);
    Frame[] frames = a.getFrames();
    AbstractInsnNode[] insns = mn.instructions.toArray();
    for (int i = 0; i < insns.length; ++i) {
      AbstractInsnNode insn = insns[i];
      if (frames[i] != null) {
        Value v = getTarget(insn, frames[i]);
        if (v == IsNullInterpreter.NULL
            || v == IsNullInterpreter.MAYBENULL) {
          result.add(insn);
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    try {
      a.analyze(owner, mn);
      Frame[] frames = a.getFrames();
      AbstractInsnNode[] insns = mn.instructions.toArray();
      for (int i = 0; i < insns.length; ++i) {
        AbstractInsnNode insn = insns[i];
        if (insn.getOpcode() == CHECKCAST) {
          Frame f = frames[i];
          if (f != null && f.getStackSize() > 0) {
            Object operand = f.getStack(f.getStackSize() - 1);
            Class to, from;
            try {
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  public void transform(MethodNode mn) {
    InsnList insns = mn.instructions;
    Iterator i = insns.iterator();
    while (i.hasNext()) {
      AbstractInsnNode i1 = (AbstractInsnNode) i.next();
      if (i1.getOpcode() == ICONST_0) {
        AbstractInsnNode i2 = getNext(i);
        if (i2 != null && i2.getOpcode() == IADD) {
          insns.remove(i1);
          insns.remove(i2);
        }
      }
    }
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    super.transform(mn);
  }

  private static AbstractInsnNode getNext(Iterator i) {
    while (i.hasNext()) {
      AbstractInsnNode in = (AbstractInsnNode) i.next();
      if (!(in instanceof LineNumberNode)) {
        return in;
      }
    }
    return null;
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  public void transform(MethodNode mn) {
    InsnList insns = mn.instructions;
    Iterator i = insns.iterator();
    while (i.hasNext()) {
      AbstractInsnNode i1 = (AbstractInsnNode) i.next();
      if (isALOAD0(i1)) {
        AbstractInsnNode i2 = getNext(i);
        if (i2 != null && isALOAD0(i2)) {
          AbstractInsnNode i3 = getNext(i);
          while (i3 != null && isALOAD0(i3)) {
            i1 = i2;
            i2 = i3;
            i3 = getNext(i);
          }
          if (i3 != null && i3.getOpcode() == GETFIELD) {
            AbstractInsnNode i4 = getNext(i);
            if (i4 != null && i4.getOpcode() == PUTFIELD) {
              if (sameField(i3, i4)) {
                insns.remove(i1);
                insns.remove(i2);
                insns.remove(i3);
                insns.remove(i4);
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    super.transform(mn);
  }

  private static AbstractInsnNode getNext(Iterator i) {
    while (i.hasNext()) {
      AbstractInsnNode in = (AbstractInsnNode) i.next();
      if (!(in instanceof LineNumberNode)) {
        return in;
      }
    }
    return null;
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        if (insns.size() == 0) {
          continue;
        }
        Iterator j = insns.iterator();
        while (j.hasNext()) {
          AbstractInsnNode in = (AbstractInsnNode) j.next();
          int op = in.getOpcode();
          if ((op >= IRETURN && op <= RETURN) || op == ATHROW) {
            InsnList il = new InsnList();
            il.add(new FieldInsnNode(GETSTATIC, cn.name, "timer", "J"));
            il.add(new MethodInsnNode(INVOKESTATIC, "java/lang/System",
                "currentTimeMillis", "()J"));
            il.add(new InsnNode(LADD));
            il.add(new FieldInsnNode(PUTSTATIC, cn.name, "timer", "J"));
            if (in.getPrevious() == null) {
              continue;
            }
            insns.insert(in.getPrevious(), il);
          }
        }
        InsnList il = new InsnList();
        il.add(new FieldInsnNode(GETSTATIC, cn.name, "timer", "J"));
        il.add(new MethodInsnNode(INVOKESTATIC, "java/lang/System",
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  public void transform(MethodNode mn) {
    InsnList insns = mn.instructions;
    Iterator i = insns.iterator();
    while (i.hasNext()) {
      AbstractInsnNode in = (AbstractInsnNode) i.next();
      if (in instanceof JumpInsnNode) {
        LabelNode label = ((JumpInsnNode) in).label;
        AbstractInsnNode target;
        // while target == goto l, replace label with l
        while (true) {
          target = label;
          while (target != null && target.getOpcode() < 0) {
            target = target.getNext();
          }
          if (target != null && target.getOpcode() == GOTO) {
            label = ((JumpInsnNode) target).label;
          } else {
            break;
          }
        }
        // update target
        ((JumpInsnNode) in).label = label;
        // if possible, replace jump with target instruction
        if (in.getOpcode() == GOTO && target != null) {
          int op = target.getOpcode();
          if ((op >= IRETURN && op <= RETURN) || op == ATHROW) {
            // replace 'in' with clone of 'target'
            insns.set(in, target.clone(null));
          }
        }
      }
    }
    super.transform(mn);
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  public void transform(MethodNode mn) {
    InsnList insns = mn.instructions;
    Iterator i = insns.iterator();
    while (i.hasNext()) {
      AbstractInsnNode i1 = (AbstractInsnNode) i.next();
      if (i1 instanceof VarInsnNode) {
        VarInsnNode v1 = (VarInsnNode) i1;
        int op1 = v1.getOpcode();
        if (op1 >= ILOAD && op1 <= ALOAD) {
          AbstractInsnNode i2 = getNext(i);
          if (i2 instanceof VarInsnNode) {
            VarInsnNode v2 = (VarInsnNode) i2;
            int op2 = v2.getOpcode();
            if (op2 - ISTORE == op1 - ILOAD && v2.var == v1.var) {
              insns.remove(i1);
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    super.transform(mn);
  }

  private static AbstractInsnNode getNext(Iterator i) {
    while (i.hasNext()) {
      AbstractInsnNode in = (AbstractInsnNode) i.next();
      if (!(in instanceof LineNumberNode)) {
        return in;
      }
    }
    return null;
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  • ch6.sec1.RemoveGetFieldPutFieldTransformer
  • ch6.sec1.RemoveGetFieldPutFieldTransformer2
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