Examples of org.jboss.forge.furnace.proxy.javassist.bytecode.CodeIterator

Package org.jboss.forge.furnace.proxy.javassist.bytecode

Examples of org.jboss.forge.furnace.proxy.javassist.bytecode.CodeIterator

org.jboss.forge.furnace.proxy.javassist.bytecode.CodeIterator
An iterator for editing a code attribute.
To directly read or edit a bytecode sequence, call {@link #byteAt(int)}, {@link #s16bitAt(int)}, {@link #writeByte(int,int)}, {@link #write16bit(int,int)}, and other methods. For example, if method refers to a CtMethod object, the following code substitutes the NOP instruction for the first instruction of the method:
```
 CodeAttribute ca = method.getMethodInfo().getCodeAttribute(); CodeIterator ci = ca.iterator(); ci.writeByte(Opcode.NOP, 0);
```
To visit every instruction, call {@link #next()} on a CodeIterator.It returns the index of the first byte of the next instruction.
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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         * if the attribute values were updated correctly, we would have to
         * detect it, and redo analysis, which is not cheap. Instead, we are
         * better off doing all changes in initialize() before everyone else has
         * a chance to muck things up.
         */
        CodeIterator iterator = minfo.getCodeAttribute().iterator();
        while (iterator.hasNext()) {
            try {
                int pos = iterator.next();
                int c = iterator.byteAt(pos);


                if (c == AALOAD)
                    initFrames(clazz, minfo);


                if (c == AALOAD || c == BALOAD || c == CALOAD || c == DALOAD

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        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();

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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));

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org.jboss.forge.furnace.proxy.javassist.bytecode.analysis.FramePrinter

org.jboss.forge.furnace.proxy.javassist.bytecode.analysis.SubroutineScanner

org.jboss.forge.furnace.proxy.javassist.convert.TransformAccessArrayField

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