createFMIModelStructure fails for a simple model with function

[Rüdiger Franke]

Consider the following model:

model SortTest
  input Real[3] u;
  output Real[:] y = Modelica.Math.Vectors.sort(u);
end SortTest;

Attempting to translate to FMU 2.0 gives the error:

[7] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/Util/Graph.mo: 990:5-990:101]: Internal error Graph.addForbiddenColors failed.

[8] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/Util/Graph.mo: 971:5-971:107]: Internal error Graph.partialDistance2colorInt failed.

[9] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/BackEnd/SymbolicJacobian.mo: 1553:5-1553:75]: Internal error function mapIndexColors failed

[10] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/BackEnd/SymbolicJacobian.mo: 1296:5-1296:75]: Internal error function createColoring failed

[11] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/BackEnd/SymbolicJacobian.mo: 1234:9-1234:86]: Internal error function generateSparsePattern failed

[12] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/BackEnd/SymbolicJacobian.mo: 1651:3-1651:84]: Internal error function createFMIModelDerivatives failed

[13] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/SimCode/SimCodeUtil.mo: 12761:3-12761:85]: Internal error SimCodeUtil.createFMIModelStructure failed

[14] 21:58:56 Translation Error
[/home/rfranke/OpenModelica/OMCompiler/Compiler/SimCode/SimCodeUtil.mo: 625:5-625:146]: Internal error function createSimCode failed [Transformation from optimised DAE to simulation code structure failed]

[15] 21:58:56 Translation Error
Internal error SimCode: The model SortTest could not be translated to FMU

[Willi Braun]

It's fixed by ​PR2206.

[Rüdiger Franke]

Generation of ModelStructure works now. FMI Jacobian code still fails though.

The fix challenges code generation by making use of a previously unused feature: assignment of arrays to Jacobian variables, see ​PR2230

There is a remaining issue: the backend introduces the variable uSeedFMIDER that is unknown during code generation. This seems to be related to u being input. FMI export with -disableDirectionalDerivatives works with an intermediate variable:

model SortTest
  input Real[3] u;
  Real x = 2*u;
  output Real[:] y = Modelica.Math.Vectors.sort(x);
end SortTest;

[Willi Braun]

Fixed in ​PR2236.