Package javassist.bytecode

Examples of javassist.bytecode.CodeAttribute

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        List list = cf.getMethods();
        int n = list.size();
        for (int i = 0; i < n; ++i) {
            MethodInfo minfo = (MethodInfo)list.get(i);
            if (minfo.isConstructor()) {
                CodeAttribute codeAttr = minfo.getCodeAttribute();
                if (codeAttr != null)
                    try {
                        Bytecode init = new Bytecode(cp, 0,
                                                codeAttr.getMaxLocals());
                        CtClass[] params
                            = Descriptor.getParameterTypes(
                                                minfo.getDescriptor(),
                                                classPool);
                        int stacksize = makeFieldInitializer(init, params);
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    public void print(CtMethod method) {
        stream.println("\n" + getMethodString(method));
        MethodInfo info = method.getMethodInfo2();
        ConstPool pool = info.getConstPool();
        CodeAttribute code = info.getCodeAttribute();
        if (code == null)
            return;

        Frame[] frames;
        try {
            frames = (new Analyzer()).analyze(method.getDeclaringClass(), info);
        } catch (BadBytecode e) {
            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) {
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     *         or null if this method doesn't have code
     * @throws BadBytecode if the bytecode does not comply with the JVM specification
     */
    public Frame[] analyze(CtClass clazz, MethodInfo method) throws BadBytecode {
        this.clazz = clazz;
        CodeAttribute codeAttribute = method.getCodeAttribute();
        // Native or Abstract
        if (codeAttribute == null)
            return null;

        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);

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    Map subTable = new HashMap();
    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();

        scan(0, iter, null);

        ExceptionTable exceptions = code.getExceptionTable();
        for (int i = 0; i < exceptions.size(); i++) {
            int handler = exceptions.handlerPc(i);
            // If an exception is thrown in subroutine, the handler
            // is part of the same subroutine.
            scan(handler, iter, subroutines[exceptions.startPc(i)]);
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          || methodName.equals( NEXT_GETTER_NAME )
          || methodName.equals( NEXT_SETTER_NAME ) ) {
        continue;
      }

      final CodeAttribute codeAttr = methodInfo.getCodeAttribute();
      if ( codeAttr == null ) {
        // would indicate an abstract method, continue to next method
        continue;
      }

      try {
        CodeIterator itr = codeAttr.iterator();
        while ( itr.hasNext() ) {
          int index = itr.next();
          int op = itr.byteAt( index );
          if ( op != Opcode.PUTFIELD && op != Opcode.GETFIELD ) {
            continue;
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                }

                @Override
                public byte[] generateMethod() {
                    getDescriptor();
                    CodeAttribute ca = constructor.getCodeAttribute();
                    getMethodInfo().setDescriptor(constructor.getDescriptor().replace("Z)", ")"));
                    maxStackSize = ca.getMaxStack();
                    numLocals = ca.getMaxLocals();
                    exceptionTable = ca.getExceptionTable();
                    byte[] code = ca.getCode().clone();
                    if (haveUnicode) {  // remove java.lang.Object<init> call
                        code[0] = ICONST_0;
                        code[1] = ISTORE;
                        code[2] = 4;
                    } else {
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            CtMember.Cache cache = hasMemberCache();
            if (cache != null)
                cache.addConstructor(new CtConstructor(m, this));
        }
        else {
            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();
                if (maxlocals < localsize)
                    codeAttr.setMaxLocals(localsize);
            }
            catch (BadBytecode e) {
                throw new CannotCompileException(e);
            }
        }
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        List list = cf.getMethods();
        int n = list.size();
        for (int i = 0; i < n; ++i) {
            MethodInfo minfo = (MethodInfo)list.get(i);
            if (minfo.isConstructor()) {
                CodeAttribute codeAttr = minfo.getCodeAttribute();
                if (codeAttr != null)
                    try {
                        Bytecode init = new Bytecode(cp, 0,
                                                codeAttr.getMaxLocals());
                        CtClass[] params
                            = Descriptor.getParameterTypes(
                                                minfo.getDescriptor(),
                                                classPool);
                        int stacksize = makeFieldInitializer(init, params);
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          || methodName.startsWith(EACH_WRITE_METHOD_PREFIX)
          || methodName.equals(GETFIELDHANDLER_METHOD_NAME)
          || methodName.equals(SETFIELDHANDLER_METHOD_NAME)) {
        continue;
      }
      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);
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                CtMethod.ConstParameter.string(constructor.getSignature()),
                ctClass
        );
        newConstructor.setBody(constructor, null);
        newConstructor.setModifiers(accessFlags);
        CodeAttribute codeAttribute = newConstructor.getMethodInfo().getCodeAttribute();
        codeAttribute.setMaxLocals(codeAttribute.getMaxLocals() + 1);

        ctClass.addConstructor(newConstructor);
    }
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