Examples of javassist.bytecode.CodeIterator

javassist.bytecode.CodeIterator
An iterator for editing a code attribute.
If there are multiple CodeIterators referring to the same Code_attribute, then inserting a gap by one CodeIterator will break the other CodeIterator.
This iterator does not provide remove(). If a piece of code in a Code_attribute is unnecessary, it should be overwritten with NOP. @see CodeAttribute#iterator()

            CodeAttribute codeAttr = m.getCodeAttribute();
            if (codeAttr == null)
                throw new CannotCompileException("empty <clinit>");


            try {
                CodeIterator it = codeAttr.iterator();
                int pos = it.insertEx(code.get());
                it.insert(code.getExceptionTable(), pos);
                int maxstack = codeAttr.getMaxStack();
                if (maxstack < stacksize)
                    codeAttr.setMaxStack(stacksize);


                int maxlocals = codeAttr.getMaxLocals();

View Full Code Here

    private static void insertAuxInitializer(CodeAttribute codeAttr,
                                             Bytecode initializer,
                                             int stacksize)
        throws BadBytecode
    {
        CodeIterator it = codeAttr.iterator();
        int index = it.skipSuperConstructor();
        if (index < 0) {
            index = it.skipThisConstructor();
            if (index >= 0)
                return;         // this() is called.


            // Neither this() or super() is called.
        }


        int pos = it.insertEx(initializer.get());
        it.insert(initializer.getExceptionTable(), pos);
        int maxstack = codeAttr.getMaxStack();
        if (maxstack < stacksize)
            codeAttr.setMaxStack(stacksize);
    }

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            throw new RuntimeException(e);
        }


        int spacing = String.valueOf(code.getCodeLength()).length();


        CodeIterator iterator = code.iterator();
        while (iterator.hasNext()) {
            int pos;
            try {
                pos = iterator.next();
            } catch (BadBytecode e) {
                throw new RuntimeException(e);
            }


            stream.println(pos + ": " + InstructionPrinter.instructionString(iterator, pos, pool));

View Full Code Here


        int maxLocals = codeAttribute.getMaxLocals();
        int maxStack = codeAttribute.getMaxStack();
        int codeLength = codeAttribute.getCodeLength();


        CodeIterator iter = codeAttribute.iterator();
        IntQueue queue = new IntQueue();


        exceptions = buildExceptionInfo(method);
        subroutines = scanner.scan(method);


        Executor executor = new Executor(clazz.getClassPool(), method.getConstPool());
        frames = new Frame[codeLength];
        frames[iter.lookAhead()] = firstFrame(method, maxLocals, maxStack);
        queue.add(iter.next());
        while (!queue.isEmpty()) {
            analyzeNextEntry(method, iter, queue, executor);
        }


        return frames;

View Full Code Here

    Set done = new HashSet();




    public Subroutine[] scan(MethodInfo method) throws BadBytecode {
        CodeAttribute code = method.getCodeAttribute();
        CodeIterator iter = code.iterator();


        subroutines = new Subroutine[code.getCodeLength()];
        subTable.clear();
        done.clear();

View Full Code Here

      }
      CodeAttribute codeAttr = minfo.getCodeAttribute();
      if (codeAttr == null) {
        continue;
      }
      CodeIterator iter = codeAttr.iterator();
      while (iter.hasNext()) {
        try {
          int pos = iter.next();
          pos = transformInvokevirtualsIntoGetfields(classfile, iter, pos);
          pos = transformInvokevirtualsIntoPutfields(classfile, iter, pos);


        } catch (BadBytecode e) {
          throw new CannotCompileException(e);

View Full Code Here

                        System.out.println("calleeMethod = " + calleeMethod.getName());
                        System.out.println("calleeClassName = " + calleeClassName);
                        System.out.println("methodCall = " + methodCall.indexOfBytecode());
                        methodCall.replace("{java.lang.System.out.println($args[0]); $_=null;}");
                        try {
                            CodeIterator it = where.getMethodInfo().getCodeAttribute().iterator();
                            it.move(methodCall.indexOfBytecode() - 5);
                            System.out.println("it.get() = " + it.get());
                            it.next();
                            System.out.println("it.get() = " + it.get());
                            it.next();
                            System.out.println("it.get() = " + it.get());
                            it.next();
                            System.out.println("it.get() = " + it.get());
                            it.next();
                        } catch (Throwable t) {
                            t.printStackTrace();
                        }
                        return;

View Full Code Here

            CodeAttribute codeAttr = m.getCodeAttribute();
            if (codeAttr == null)
                throw new CannotCompileException("empty <clinit>");


            try {
                CodeIterator it = codeAttr.iterator();
                int pos = it.insertEx(code.get());
                it.insert(code.getExceptionTable(), pos);
                int maxstack = codeAttr.getMaxStack();
                if (maxstack < stacksize)
                    codeAttr.setMaxStack(stacksize);


                int maxlocals = codeAttr.getMaxLocals();

View Full Code Here

    private static void insertAuxInitializer(CodeAttribute codeAttr,
                                             Bytecode initializer,
                                             int stacksize)
        throws BadBytecode
    {
        CodeIterator it = codeAttr.iterator();
        int index = it.skipSuperConstructor();
        if (index < 0) {
            index = it.skipThisConstructor();
            if (index >= 0)
                return;         // this() is called.


            // Neither this() or super() is called.
        }


        int pos = it.insertEx(initializer.get());
        it.insert(initializer.getExceptionTable(), pos);
        int maxstack = codeAttr.getMaxStack();
        if (maxstack < stacksize)
            codeAttr.setMaxStack(stacksize);
    }

View Full Code Here

            CodeAttribute codeAttr = m.getCodeAttribute();
            if (codeAttr == null)
                throw new CannotCompileException("empty <clinit>");


            try {
                CodeIterator it = codeAttr.iterator();
                int pos = it.insertEx(code.get());
                it.insert(code.getExceptionTable(), pos);
                int maxstack = codeAttr.getMaxStack();
                if (maxstack < stacksize)
                    codeAttr.setMaxStack(stacksize);


                int maxlocals = codeAttr.getMaxLocals();

View Full Code Here

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