code coverage on the command line

testprof.m

#import <stdio.h>

// xcrun clang -g -Wall -Werror -fprofile-instr-generate -fcoverage-mapping -o testprof testprof.m
// ./testprof
// xcrun llvm-profdata merge -o testprof.profdata default.profraw
// xcrun llvm-cov show ./testprof -instr-profile=testprof.profdata testprof.m


static int DoSomething (int value) {
    if (value == 55) {
        printf ("got 55\n");
    } else {
        printf ("got something else\n");
    }

    return 23;

} // DoSomething


static void DoSomethingElse (int value) {
    int blah = DoSomething(value);

    if (blah == 23) {
        printf ("yay 23\n");
    } else {
        printf ("bummer\n");
    }

} // DoSomethingElse


int main (int argc, char *argv[]) {
    
    if (argc != 1) {
        printf ("bad usage\n");
        return -1;
    }

    DoSomethingElse (55);

    return 0;

} // main


#if 0


% ./testprof
got 55
yay 23
% xcrun llvm-profdata merge -o testprof.profdata default.profraw
% xcrun llvm-cov show ./testprof -instr-profile=testprof.profdata testprof.m
       |    1|#import <stdio.h>
       |    2|
       |    3|// clang -g -Wall -Werror -o testprof testprof.m
       |    4|// clang -g -Wall -Werror -fprofile-instr-generate -fcoverage-mapping -o testprof testprof.m
       |    5|
       |    6|
      1|    7|static int DoSomething (int value) {
      1|    8|    if (value == 55) {
      1|    9|        printf ("got 55\n");
      0|   10|    } else {
      0|   11|        printf ("got something else\n");
      0|   12|    }
      1|   13|
      1|   14|    return 23;
      1|   15|
      1|   16|} // DoSomething
       |   17|
       |   18|
      1|   19|static void DoSomethingElse (int value) {
      1|   20|    int blah = DoSomething(value);
      1|   21|
      1|   22|    if (blah == 23) {
      1|   23|        printf ("yay 23\n");
      0|   24|    } else {
      0|   25|        printf ("bummer\n");
      0|   26|    }
      1|   27|
      1|   28|} // DoSomethingElse
       |   29|
       |   30|
      1|   31|int main (int argc, char *argv[]) {
      1|   32|    
      0|   33|    if (argc != 1) {
      0|   34|        printf ("bad usage\n");
      0|   35|        return -1;
      0|   36|    }
      1|   37|
      1|   38|    DoSomethingElse (55);
      1|   39|
      1|   40|    return 0;
      1|   41|
      1|   42|} // main
#endif

testprof.swift

// xcrun swiftc -profile-generate -profile-coverage-mapping testprof.swift
// ./testprof
// xcrun llvm-profdata merge -o testprof.profdata default.profraw
// xcrun llvm-cov show ./testprof -instr-profile=testprof.profdata testprof.swift

func DoSomething (value: Int) -> Int {
    if value == 55 {
        print ("got 55\n")
    } else {
        print ("got something else\n")
    }

    return 23;
}

func DoSomethingElse (value: Int) -> Void {
     let blah = DoSomething (value)
     
     if blah == 23 {
          print ("yay 23")
     } else {
       	  print ("bummer")
     }     
}

DoSomethingElse(55)

/*
       |    1|// xcrun swiftc -profile-generate -profile-coverage-mapping testprof.swift
       |    2|// testprof
       |    3|// xcrun llvm-profdata merge -o testprof.profdata default.profraw
       |    4|// xcrun llvm-cov show ./testprof -instr-profile=testprof.profdata testprof.swift
       |    5|
      1|    6|func DoSomething (value: Int) -> Int {
      1|    7|    if value == 55 {
      1|    8|        print ("got 55\n")
      0|    9|    } else {
      0|   10|        print ("got something else\n")
      0|   11|    }
      1|   12|
      1|   13|    return 23;
      1|   14|}
       |   15|
      1|   16|func DoSomethingElse (value: Int) -> Void {
      1|   17|     let blah = DoSomething (value)
      1|   18|
      1|   19|     if blah == 23 {
      1|   20|          print ("yay 23")
      0|   21|     } else {
      0|   22|            print ("bummer")
      0|   23|     }
      1|   24|}
       |   25|
       |   26|DoSomethingElse(55)

*/

Any ideas on how I would be able to run this on an entire Xcode project?

the same question

$ xcrun swiftc -profile-generate -profile-coverage-mapping testprof.swift
$ xcrun llvm-profdata merge -o testprof.profdata default.profraw
$ xcrun llvm-cov show ./testprof -instr-profile=testprof.profdata testprof.m

Got it with a iOS framework project (named CodeCoverage):

xcodebuild test -scheme CodeCoeverage-destination name="iPhone SE" -destination-timeout 60 -derivedDataPath ./DerivedData
xcrun llvm-cov show DerivedData/Build/Intermediates/CodeCoverage/Products/Debug-iphonesimulator/CodeCoverage.framework/CodeCoverage -instr-profile=DerivedData/Build/Intermediates/CodeCoverage/Coverage.profdata