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10728 :: FMU - C interop

• mantielero (orginal) [2023-12-03T18:03:04+01:00] view original

  I am working on a project where I try to export FMU (which it is a format used for simulations).

  I have a couple of working examples where I manage to export a FMU, but they show an error when I pass a fmuchecker on them.

  The failure that I get from fmuchecker is:

  
  [ERROR][FMUCHK] FMU logger callback does not propagate component environment to the application
  Run

  (this check takes place here)

  The logger callback signature is defined here in my code (which is based on this type definition).

  Any clue about why I might be getting this failure?

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• Araq (orginal) [2023-12-03T22:17:59+01:00] view original

  a6: varargs[fmi2String] is wrong, instead you should use the .varargs pragma.

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• mantielero (orginal) [2023-12-03T22:53:16+01:00] view original

  Thanks @Araq. When I try that, the generated C code looks good:

  typedef N_CDECL_PTR(void, tyProc__cHW7sT4DDkMwCdiO69bkpDw) (void* c_p0, NCSTRING instanceName_p1, tyEnum_fmi2Status__tRvUjl2s9cdFxDxRk7K39cSA status_p2, NCSTRING category_p3, NCSTRING message_p4, ...);
  Run

  but I continue having the same error. I don't know why.

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• mantielero (orginal) [2023-12-07T10:51:48+01:00] view original

  The issue is that, for some reason, componentEnvironment`within `functions parameter (it is an argument of fmi2Instantiate) is nil.

  The procedure fmi2Instantiate is receiving functions: fmi2CallbackFunctions as a parameter where:

  type
    fmi2CallbackFunctions* = ref object
      logger*: fmi2CallbackLogger
      allocateMemory*: fmi2CallbackAllocateMemory
      freeMemory*: fmi2CallbackFreeMemory
      stepFinished*: fmi2StepFinished
      componentEnvironment*: fmi2ComponentEnvironment
  Run

  defined here.

  And those types are:

  fmi2CallbackLogger*  = proc( c: fmi2ComponentEnvironment,
                                 instanceName: fmi2String,
                                 status: fmi2Status,
                                 category: fmi2String,
                                 message: fmi2String) {.varargs.}
    fmi2CallbackAllocateMemory* = proc(a1: cuint, a2: cuint)
    fmi2CallbackFreeMemory*  = proc(a1: pointer)
    fmi2StepFinished*  = proc(a1: fmi2ComponentEnvironment, a2: fmi2Status)
  Run

  defined just above.

  And fmi2ComponentEnvironment:

  # typedef void*           fmi2ComponentEnvironment;
  type
      fmi2ComponentEnvironment* = pointer #  Pointer to FMU environment
  Run

  I wonder if the issue might be on how the types above are defined. Can you spot something wrong? In particular, I wonder if I am using exportc where I should.

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• mantielero (orginal) [2023-12-08T11:40:13+01:00] view original

  For the record, the issue was fixed by adding cdecl in the following types.

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