Check safety-related optimization settings for data initialization

mathworks.hism.hisl_0052

Dependencies: Simulink^® Check™

Usage: High-Integrity System Modeling

Guideline: hisl_0052: Configuration Parameters > Optimization > Data initialization

Description

This check verifies that model optimization configuration parameters are set optimally for generating code for a safety-related application. Although highly optimized code is desirable for most real-time systems, some optimizations can have undesirable side effects that impact safety.

Recommended Actions and Results

Review the violations that are flagged by the check and the recommended action for fixing the issue. After applying the changes, save the model and rerun the check analysis.

If you consider the flagged violation to either not be relevant or not feasible for your design, use the Justify button to provide rationale as to why the violation is either not relevant or not feasible for your design.

You can use the Fix button to allow the Model Advisor to fix all flagged violations. For this check, the Model Advisor configures model code generation settings that can impact safety.

Modeling Condition	Recommended Action
The optimization that suppresses the generation of initialization code for root-level inports and outports that are set to zero is selected. For safety-related code, you should explicitly initialize all variables.	If you have an Embedded Coder® license and are using an ERT-based system target file, clear Configuration Parameter Remove root level I/O zero initialization (Embedded Coder) or set the parameter ZeroExternalMemoryAtStartup to on. Alternatively, confirm that your compiler is standards-compliant, as most modern C compilers initialize global data to zero. Or, integrate external, handwritten code that initializes all I/O variables to zero explicitly.
The optimization that suppresses the generation of initialization code for internal work structures, such as block states and block outputs that are set to zero, is selected. For safety-related code, you should explicitly initialize every variable.	If you have an Embedded Coder license and are using an ERT-based system target file, clear Configuration Parameter Remove internal data zero initialization (Embedded Coder) or set the parameter ZeroInternalMemoryAtStartup to on. Alternatively, confirm that your compiler is standards-compliant, as most modern C compilers initialize global data to zero. Or, integrate external, handwritten code that initializes every state variable to zero explicitly.

Subchecks depend on the results of the subchecks noted with D in the results table in the Model Advisor window.

Capabilities and Limitations

• Does not require model compilation

• Does not run on library models

• Does not allow exclusions of blocks or charts

• Does not highlight parameter names in report without Embedded Coder

Version History

Introduced in R2020a