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Extract coverage data for generated C/C++ code and custom C/C++ code (MATLAB code generation)

Since R2023a



    coverageObject = getCodeCoverageData(myMEXFunction) generates C/C++ code coverage object by using data created by latest execution of myMEXFunction in software-in-the-loop (SIL) or processor-in-the-loop (PIL) simulation. Running this function also opens the C/C++ code coverage HTML report.


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    This example shows how to use the instrumentCode function to add instrumentation for C/C++ coverage analysis to code that you already generated by using the codegen command. To perform coverage analysis, you need a MATLAB® Test™ license.

    Define Entry-Point Function and Generate Code

    Define a MATLAB entry-point function coverageAnalysisExample that performs a binary operation on its first two inputs. The binary operation depends on whether the third input is positive, negative, or zero.

    type coverageAnalysisExample
    function out = coverageAnalysisExample(A,B,flag) %#codegen
    if flag > 0
        out = A + B;
    elseif flag < 0
        out = A - B;
        out = A * B;

    Generate static library code for software-in-the-loop (SIL) execution. Specify all inputs to be of scalar double type. Specify the name of the code generation folder to be my_codegen_folder.

    cfg = coder.config('lib');
    cfg.VerificationMode = 'SIL';
    codegen -config cfg coverageAnalysisExample -args {0,0,0} -d my_codegen_folder
    Code generation successful.

    Add Instrumentation to Generated Code

    Add C/C++ code coverage instumentation to the generated code and produce an instrumented MEX.

    instrumentCode('my_codegen_folder', 'CodeCoverage', true)
    Completed instrumentation of generated code.

    Execute the MEX and View Coverage Data

    Execute coverageAnalysisExample_sil with two sets of sample inputs. Make sure the third input is positive for one set and negative for the other.

    ### Starting SIL execution for 'coverageAnalysisExample'
        To terminate execution: clear coverageAnalysisExample_sil
    ans = 14
    ans = 6

    Terminate SIL execution and view the code coverage report.

    clear coverageAnalysisExample_sil
    ### Application stopped
    ### Stopping SIL execution for 'coverageAnalysisExample'
        Code coverage report: getCodeCoverageData('coverageAnalysisExample_sil')


    Because neither of your test runs had the third input argument equal to zero, the last branch of the if-else block was never executed in the generated C entry-point file coverageAnalysisExample.c. This caused the coverageAnalysisExample.c file to have less than 100% statement coverage.

    Input Arguments

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    Name of the software-in-the-loop (SIL) or processor-in-the-loop (PIL) MEX function for which you intend to generate C/C++ code coverage report.

    Data Types: char | string

    Version History

    Introduced in R2023a