code: public void setCodeBuffer(CodeBuffer code) {
          mCodeBuffer = code;
          mOldLineNumberTable = mLineNumberTable;
          mOldLocalVariableTable = mLocalVariableTable;
          mOldStackMapTable = mStackMapTable;
          mAttributes.remove(mLineNumberTable);
          mAttributes.remove(mLocalVariableTable);
          mAttributes.remove(mStackMapTable);
          mLineNumberTable = null;
          mLocalVariableTable = null;
          mStackMapTable = null;
      }
docs: As a side effect of calling this method, new line number and local
  variable tables are created.