8000 Why does the branch coverage of all files show as 0% when using llvm-cov to analyze Swift files? · Issue #81730 · swiftlang/swift · GitHub
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Why does the branch coverage of all files show as 0% when using llvm-cov to analyze Swift files? #81730

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ZhengXiuQun opened this issue May 23, 2025 · 3 comments
Open

Why does the branch coverage of all files show as 0% when using llvm-cov to analyze Swift files? #81730

ZhengXiuQun opened this issue May 23, 2025 · 3 comments
Labels
code coverage Area → source tooling: code coverage compiler The Swift compiler itself feature A feature request or implementation IRGen LLVM IR generation swift 6.2 unexpected behavior Bug: Unexpected behavior or incorrect output

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@ZhengXiuQun
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Description

Why does the branch coverage of all files show as 0% when using llvm-cov to analyze Swift files? The llvm developer replied that it is because Swift does not support generating branch coverage. Is that true?

Reproduction



Expected behavior


Why does the branch coverage of all files show as 0% when using llvm-cov to analyze Swift files?


Environment


Latest


Additional information


Why does the branch coverage of all files show as 0% when using llvm-cov to analyze Swift files?

      		
    

      
  





        



            
            

              
            

        

      


      
    








      

    



      

  
            

    

      
    

    


      

          @ZhengXiuQun
ZhengXiuQun




            added
      

  bug

  A deviation from expected or documented behavior. Also: expected but undesirable behavior.

      

  triage needed

  This issue needs more specific labels

  labels


      May 23, 2025

    

  








      

  
      



  

  @hamishknight





  


    

      

  

    

        
    
    

  


      
          
  
      
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The llvm developer replied that it is because Swift does not support generating branch coverage. Is that true?




This is correct, Swift only currently supports emitting code regions and skipped regions

      		
    

  





        


            

            
            

              
            

        

      


      

            
  
  

    
  
    
    

  

  

  


    












      

  
      



  

  @ZhengXiuQun





  


    

      

  

    

        
    
    

  


      
          
  
      
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Is there a plan to support branch coverage?

      		
    

  





        


            

            
            

              
            

        

      


      

            
  
  

    
  
    
    

  

  

  


    












      

  
            

    

      
    

    


      

          @AnthonyLatsis
AnthonyLatsis




            added
      

  compiler

  The Swift comp
8E81
iler itself

      

  IRGen

  LLVM IR generation

      

  code coverage

  Area → source tooling: code coverage

      

  unexpected behavior

  Bug: Unexpected behavior or incorrect output

      

  swift 6.2


    and removed
      

  triage needed

  This issue needs more specific labels

  labels


      May 26, 2025

    

  








      

  
      



  

  @hamishknight





  


    

      

  

    

        
    
    

  


      
          
  
      
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It's something I'd like to do, but it's not on the immediate roadmap

      		
    

  





        


            

            
            

              
            

        

      


      

            
  
  

    
  
    
    

  

  

  


    












      

  
            

    

      
    

    


      

          @hamishknight
hamishknight




            added
      

  feature

  A feature request or implementation

    and removed
      

  bug

  A deviation from expected or documented behavior. Also: expected but undesirable behavior.

  labels


      May 27, 2025

    

  












  
  

    

      

  





  




  
  

              

  
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    code coverage

  Area → source tooling: code coverage
  

    compiler

  The Swift compiler itself
  

    feature

  A feature request or implementation
  

    IRGen

  LLVM IR generation
  

    swift 6.2

  

    unexpected behavior

  Bug: Unexpected behavior or incorrect output








      

  

    

        

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      3 participants
    

    

        
          @ZhengXiuQun 
        
          @hamishknight 
        
          @AnthonyLatsis 
    

  






    

    




    






  

          

        



    



  





    

  


  


          



    



  

    

    

    





    


    

    

  



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