[Oberon] Assumed issue in the Lola-2 compiler

rochus.keller at bluewin.ch rochus.keller at bluewin.ch
Fri Apr 12 23:31:40 CEST 2019

Meawhile I was able to do some cross-validation of my C++ version of the Lola compiler. I originally wanted to compile the Lola compiler on the Oberon System and translate the Lola RISC5 files to Verilog there. Unfortunately I had no luck with the Oberon System Plugin 2.5 release on Windows 10. Eventually I managed to create an executable of the original Lola-2 compiler using https://github.com/vishaps/voc . I'm aware that this is also a transpiler but at least an independent implementation.

Both Lola-2 compilers - the one created with voc and also my C++ version - produce exactly the same output. Here are the links to the generated files:
voc version: https://github.com/rochus-keller/Lolac/tree/master/Examples/RISC5_translated_by_LSC_LSV 
c++ version: https://github.com/rochus-keller/Lolac/tree/master/Examples/RISC5_translated

Both generated file sets show the wrong type "???" in some declarations; see e.g. RISC5Top.v lines 21 to 26. 

I used the source code from https://people.inf.ethz.ch/wirth/Lola/index.html 

It would be a little surprising if I were the first to encounter this problem. That's why I put my question into the round, who has already seen the problem and how to solve it. Does someone have a version of the Lola-2 which generates other output?


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