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Check usage of unary minus operations in Stateflow charts

Check ID: mathworks.maab.jc_0451

Guideline: jc_0451: Use of unary minus on unsigned integers

Description

Identify unary minus operations applied to unsigned integers in Stateflow® objects.

Do not perform unary minus operations on unsigned integers in Stateflow objects.

This check requires a Simulink® Check™ and Stateflow license.

Check Parameterization

This check does not include sub-checks because the MAB modeling guideline provides only one sub ID.

For reference, the MAB guideline sub ID(s) that are recommended for use by the NA-MAAB and JMAAB modeling standards organizations are:

  • NA-MAAB — a

  • JMAAB — a

Results and Recommended Actions

ConditionRecommended Action
Unary minus operations are applied to unsigned integers in Stateflow objects.Modify the specified objects to remove dependency on unary minus operations.
The Model Advisor could not determine the data types in expressions with unary minus operations.Typecast the specified expressions explicitly to allow Model Advisor to determine the data types.

Capabilities and Limitations

  • Does not run on library models.

  • Does not analyze content of library linked blocks.

  • Analyzes content in all masked subsystems.

  • Allows exclusions of blocks and charts.