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()

    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

        // 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;
          }


          int constIndex = itr.u16bitAt( index+1 );


          final String fieldName = constPool.getFieldrefName( constIndex );
          final PersistentAttributeDescriptor attributeDescriptor = attributeDescriptorMap.get( fieldName );


          if ( attributeDescriptor == null ) {
            // its not a field we have enhanced for interception, so skip it
            continue;
          }


          log.tracef(
              "Transforming access to field [%s] from method [%s]",
              fieldName,
              methodName
          );


          if ( op == Opcode.GETFIELD ) {
            int read_method_index = constPool.addMethodrefInfo(
                constPool.getThisClassInfo(),
                attributeDescriptor.getReader().getName(),
                attributeDescriptor.getReader().getSignature()
            );
            itr.writeByte( Opcode.INVOKESPECIAL, index );
            itr.write16bit( read_method_index, index+1 );
          }
          else {
            int write_method_index = constPool.addMethodrefInfo(
                constPool.getThisClassInfo(),
                attributeDescriptor.getWriter().getName(),
                attributeDescriptor.getWriter().getSignature()
            );
            itr.writeByte( Opcode.INVOKESPECIAL, index );
            itr.write16bit( write_method_index, index+1 );
          }
        }


        StackMapTable smt = MapMaker.make( classPool, methodInfo );
        methodInfo.getCodeAttribute().setAttribute(smt);

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 = 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

            return false;
        }
    }


    private void insertBeforeReturn(final MethodInfo method, final Bytecode s, final Bytecode b) throws BadBytecode {
        final CodeIterator itr = method.getCodeAttribute().iterator();
        itr.insert(s.get());
        while (itr.hasNext()) {
            final int pos = itr.next();
            int opcode = itr.byteAt(pos);
            if (opcode == Opcode.ARETURN) {
                itr.insert(pos, b.get());
            }
        }
        method.getCodeAttribute().computeMaxStack();
    }

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                                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 = 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

            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

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