[PATCH] D18787: [Coverage] Prevent false instantiations detection in case of macro expansions.

[Igor Kudrin via llvm-commits]

ikudrin added a comment.

Use the following commands to reproduce the issue:

  $ cat > sample.cpp << EOF
  #include "sample.h"
  
  void func1() {
    DO_SOMETHING();
  }
  
  void func2() {
    DO_SOMETHING();
  }
  
  int main() {
    for (int I = 0; I < 10; ++I)
      if (I < 7)
        func1();
      else
        func2();
    return 0;
  }
  EOF
  $ cat > sample.h << EOF
  #define DO_SOMETHING() \
    do { \
    } while(0)
  
  /*
   * We need some lines here to show the issue.
   *
   *
   *
   */
  EOF
  $ clang++ -fprofile-instr-generate -fcoverage-mapping sample.cpp 
  $ ./a.out
  $ llvm-profdata merge -o default.profdata default.profraw
  $ llvm-cov show a.out -instr-profile default.profdata -filename-equivalence sample.h 
         |    1|#define DO_SOMETHING() \
       10|    2|  do { \
       10|    3|  } while(0)
         |    4|
         |    5|/*
    ------------------
    | _Z5func1v:
    |      7|    3|  } while(0)
    |      7|    4|
    |      7|    5|/*
    ------------------
         |    6| * We need some lines here to show the issue.
         |    7| *
         |    8| *
         |    9| *
    ------------------
    | _Z5func2v:
    |      3|    7| *
    |      3|    8| *
    |      3|    9| *
    ------------------
         |   10| */


http://reviews.llvm.org/D18787