How do I make a code generator that converts IEC 61131 structured text to C+

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I am interested in making a compiler for IEC 61131 Structured Text to target an ARM processor. I want the code generator output to be in C++. Then I plan on using GCC C++ to ARM. I already have C++ code for ARM to act as a runtime.

The PC program tool of choice is C# and I was looking at Antlr or Coco/R to convert Structured Text to C++. After reviewing Antlr I was confused on how it could generate C++. And if I understand Coco/R correctly, the code generation is part of the .atg file in the Production area.

I am new to parser concepts. So any advice would be appreciated.

What I have tried:

I have been looking at example projects and grammar files for Antlr and COCO/R. I have also tried installing and running Antlr works 1 and 2. But both Antlr editors don't function for various reasons.
I also noticed IEC 61131 Structured Text is very similar to Pascal and thought I could use Pascal grammar files as a starting point.

Posted 1-Jun-16 14:08pm

Member 8816170

Updated 3-Feb-22 1:48am

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George Jonsson 1-Jun-16 22:14pm

ANTLR4 could be a good choice, it as free without any licensing as far as I know.
However, in order to get the most out of it I recommend you to buy the book. In the book you have lots examples including how to write a simple language parser.

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Garth J Lancaster · Answer 1 · 2016-06-01T15:10:00

I'm not sure what (particularly the 2nd sentence) in

Quote:
Then I plan on using GCC C++ to ARM. I already have C++ code for ARM to act as a runtime.

means - can you elaborate ?

Certainly I see no real issue using Antlr or COCO/R or ? to take IEC 61131 Structured Text, and build a 'parse tree', and then take that parse tree and produce [something] - had you not have indicated that you want to run on an ARM processor, I was originally thinking of

IEC 61131 ST --parse--> 'P-Code' ---//---> Destination machine with 'P-Code' interpreter

where 'P-Code' was a machine dependant dare I say byte-code representation. Your version 'looks like'

IEC 61131 ST --parse--> c++ source --compile for ARM using GCC--> ARM MCU binary

If I interpret what you're saying correctly.

I'd say stick with Antlr or such, get the tools to work, build a grammar, possibly starting as you say with a Pascal type grammar, then walk the Parse/AST tree and produce your c++ file

integragreg · Answer 2 · 2016-10-26T10:59:00

Solution 2

Have a look at the Eclipse Xtext project. Once you have your grammar defined, you can write a generator pretty easily that will generate the C++ code based on your AST.

Posted 26-Oct-16 10:59am

integragreg

carl1248 · Answer 3 · 2020-04-11T05:17:00

I see this is an old post but I thought I would put my ten pence in,,,
Get the statement list into post-fix notation. You can then walk through the notation performing actions on the and/or logic. Once you get it into that format you will hopefully see the solution.
If you opt for the full compiler thing and you have no idea about compilers.....well good luck with that ... that is a big job.
But I don't think that's what you want, you want to bolt the code onto some other compiler and let that do the work....if so I suggest my ten pence solution..
Not sure what PLC you are making reference too. You mention the standard but there are different flavours/interpretations of the standard. If this is a start from scratch PLC then forget about the references to the 5 languages of the standard and just deal with a boolean expression e.g. ((a&b)|c);...the 5 languages will naturally fall out from the expression.

How do I make a code generator that converts IEC 61131 structured text to C+

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