Is code coverage for a model equal to code coverage of generated code?

Asked by Carl-Jakob Ulmer on 16 Sep 2015

Latest activity Commented on by Sebastian Castro on 18 Sep 2015

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Hi,

I use Simulink Verification and Validation toolbox to measure the code coverage while simulating the model with an automated test execution. In coverage settings I checked "Decision" and "Condition" and get in the coverage report a C1 and D1 result.

My question is how this results correlate with the code coverage of the generated code? Is it same? E.g. C1 and D1 is 100%, do I automatically have 100% for the generated code?

Thanks

Simulink version: R2014a

2 Comments

Carl-Jakob Ulmer on 18 Sep 2015

And what about testing a Stateflow Model only? Is there also a deviation between model and code coverage possible?

Sebastian Castro on 18 Sep 2015

Yes, the same principles hold for Stateflow... so you should really test code coverage as well if you can!

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Answer by Sebastian Castro on 16 Sep 2015

Edited by Sebastian Castro on 16 Sep 2015

Accepted Answer

Not necessarily... Although having 100% model coverage makes it much more likely to have 100% code coverage.

There are some factors that may cause a disparity between model and code coverage, such as optimizations in the generated code, unsupported blocks in Simulink V&V that generate more logical expressions/if-else statements in the code, legacy hand-code that may be in your model (and not analyzed by Simulink V&V), and so on.

On that note, starting with either R2015a, you can collect coverage from external C hand-code that may be in your model in the form of S-Functions.

We usually recommend using a code coverage tool to complement model coverage. Embedded Coder lets you interface with a few third-party tools so you can do this in Software-in-the-loop (SIL) or Processor-in-the-loop (PIL) modes directly from Simulink.

http://www.mathworks.com/help/ecoder/ug/code-coverage-in-sil-and-pil-simulations.html

- Sebastian

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Answer by Jeevan Thomas on 17 Sep 2015

Coverage of a model doesn't necessarily reflect coverage of generated code.

In the generated code, there will be utility functions/routines generated as part of block settings (for ex: rounding, saturate on integer overflow, div-by-zero etc) which will not be covered using Simulink V&V.

Also optimization settings plays a part too.

For code coverage, you could try tools such as BTC EmbeddedTester (works better with TargetLink as code generator), ReactisForC, BullEyeCoverage etc.

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Is code coverage for a model equal to code coverage of generated code?

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