[gem5-users] Re: Problem with SimObject

[Artyom Liu via gem5-users]

Hi Jason,

Thanks for the response. I'll check it out and see what I can do. :D

--
Artyom
artyom...@hust.edu.cn

On 3/28/22 23:04, Jason Lowe-Power via gem5-users wrote:

Hi Artyom,

You're absolutely right that the tutorial needs to be updated! The website is also open source and managed via a git repo: https://gem5.googlesource.com/public/gem5-website/ <https://gem5.googlesource.com/public/gem5-website/>. Updating this would be a good way to get started contributing to gem5 :).

By the way, for the namespace, you can also wrap the file in the following so you don't have to explicitly use namespaces everywhere:

```
namespace gem5
{
<your code>
}
```

Cheers,
Jason

On Sat, Mar 26, 2022 at 10:57 PM Artyom Liu via gem5-users <gem5-users@gem5.org <mailto:gem5-users@gem5.org>> wrote:

    Hi,

    The problem is solved by literally adding a new parameter `sim_objects`.

      > SimObject("HelloObject.py", sim_objects = ["HelloObject"])

    But I find yet another problem with the tutorial: the code that use
    classes from gem5 is missing namespace declaration. For example, the
    class `SimObject` is under namespace `gem5`, but the tutorial is using
    it directly. It makes the compiler unable to find the class.

    ```
    #ifndef __LEARNING_GEM5_HELLO_OBJECT_HH__
    #define __LEARNING_GEM5_HELLO_OBJECT_HH__

    #include "params/HelloObject.hh"
    #include "sim/sim_object.hh"

    class HelloObject : public SimObject
    {
        public:
          HelloObject(const HelloObjectParams &p);
    };

    #endif // __LEARNING_GEM5_HELLO_OBJECT_HH__
    ```

    For the compiler to work, we should use `gem5::SimObject` instead. And
    `gem5::HelloObjectParams` for the same reason.

    None of the problems are mentioned in the tutorial. I wonder if it is
    necessary to *update* the tutorial?

    Artyom
    artyom...@hust.edu.cn <mailto:artyom...@hust.edu.cn>

    On 3/27/22 10:05, Artyom Liu wrote:
     > Hi,
     >
     > I'm new to gem5 and just start learning by following the tutorial on
     > gem5.org <http://gem5.org>. However, there's a problem when I try
    to create my custom
     > object[1].
     >
     > [1]:
    https://www.gem5.org/documentation/learning_gem5/part2/helloobject/
    <https://www.gem5.org/documentation/learning_gem5/part2/helloobject/>
     >
     > I follow exactly the guide, but I fail to re-compile with scons. The
     > error message as below.
     >
     >  > Error: SimObject(HelloObject.py...) must list c++ sim_objects or
     > enums > (set either to [] if there are none).
     >
     > My gem5 version is Version 21.2.1.0, and I noticed that there's
    an *API
     > change* about SimObject declaration in Version 21.2.0.0,
    requiring that
     > sim_object parameter of SimObject declaration "should list all
    SimObject
     > classes which have a type attribute defined".
     >
     > It matches the error message. So I wonder how could I change my
     > SConscript to fit this change? My current SConscript is from the
    tutorial.
     >
     > ```
     > Import("*")
     >
     > SimObject("HelloObject.py")
     > Source("hello_object.py")
     > ```
     >
     > Artyom
     > artyom...@hust.edu.cn <mailto:artyom...@hust.edu.cn>
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