TLM extension

[DS1701]

I read some source code.

class TlmExtension : public tlm_extension<TlmExtension>
{
  ...
};
void setExtension(tlm::tlm_generic_payload &in, tlm::tlm_generic_payload &out)
{
    TlmExtension *input  = (TlmExtension *)0;
    TlmExtension *output = new TlmExtension;
    in.get_extension(input);
    if (input != NULL) {
        output->setNum(input->getNum());
        output->setChannel(input->getChannel());
        out.set_extension(output);
    }
}

 

I think above code is wrong. Because of when exit  setExtension  function. We cant delete object create by new operator (output )

How to resolve this problem?  Thanks.

BR.

 

[Eyck]

Actually this is done in the desrtuctor of the tlm_generic_payload. This part calls for all extensions the free() function. So if out is handled properly destroyed all extensions are destroyed as well. The other option is to call free_all_extensions() explicitly which also calls free() for all extensions as well as for auto extensions (those might be registered when a memory manager for the generic payload is used, usually in AT style modelling using the non-blocking interfaces).

HTH

[DS1701]

Thank @Eyck

As your comment, my understand that

1. It is done in the destructor of the the tlm_generic_payload ( both AT and LT style )

2. The other option is to call free_all_extensions() after transaction completed ( only AT style )

Is it correct? Thanks.

[Eyck]

In principle yes, but I would not call it LT or AT as it depends on hte use of a memory manager which can be used in any case.

Cheers