[Bug gcov-profile/99443] New: [GCOV] No coverage with "Aborted(core dumped)"

[Bug gcov-profile/99443] New: [GCOV] No coverage with "Aborted(core dumped)"

[njuwy at smail dot nju.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99443

            Bug ID: 99443
           Summary: [GCOV] No coverage with "Aborted(core dumped)"
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: njuwy at smail dot nju.edu.cn
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure -enable-checking=release -enable-languages=c,c++
-disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC) 

$ cat test.c
#include <x86intrin.h>
#include <stdio.h>

extern void abort(void);

#ifdef __x86_64__
#define EFLAGS_TYPE unsigned long long int
#else
#define EFLAGS_TYPE unsigned int
#endif

int main() {
  printf("1\n");
  EFLAGS_TYPE flags = 0xD7; /* 111010111b  */
  __writeeflags(flags);
  flags = __readeflags();
  printf("2\n");
  if ((flags & 0xFF) != 0xD7)
    abort();
  printf("3\n");
#ifdef DEBUG
  printf("PASSED\n");
#endif
}

$ gcc -O0 --coverage test.c;./a.out;gcov test;cat test.c.gcov
1
2
Aborted (core dumped)
test.gcda:cannot open data file, assuming not executed
File 'test.c'
Lines executed:0.00% of 8
Creating 'test.c.gcov'

File '/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/ia32intrin.h'
Lines executed:0.00% of 3
Creating 'ia32intrin.h.gcov'

        -:    0:Source:test.c
        -:    0:Graph:test.gcno
        -:    0:Data:-
        -:    0:Runs:0
        -:    1:#include <x86intrin.h>
        -:    2:#include <stdio.h>
        -:    3:
        -:    4:extern void abort(void);
        -:    5:
        -:    6:#ifdef __x86_64__
        -:    7:#define EFLAGS_TYPE unsigned long long int
        -:    8:#else
        -:    9:#define EFLAGS_TYPE unsigned int
        -:   10:#endif
        -:   11:
    #####:   12:int main() {
    #####:   13:  printf("1\n");
    #####:   14:  EFLAGS_TYPE flags = 0xD7; /* 111010111b  */
        -:   15:  __writeeflags(flags);
    #####:   16:  flags = __readeflags();
    #####:   17:  printf("2\n");
    #####:   18:  if ((flags & 0xFF) != 0xD7)
    #####:   19:    abort();
    #####:   20:  printf("3\n");
        -:   21:#ifdef DEBUG
        -:   22:  printf("PASSED\n");
        -:   23:#endif
        -:   24:}

We can see that line #13,#14 were executed,which means that main function
executed too. However, no coverage generated.

[Bug gcov-profile/99443] [GCOV] No coverage with "Aborted(core dumped)"

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99443

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is expected behavior. Aborting should not dump the coverage file
at all as it should be used for an really bad unexitable situation only.

[Bug gcov-profile/99443] [GCOV] No coverage with "Aborted(core dumped)"

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99443

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This behavior might even be documented but I have not looked yet.

[Bug gcov-profile/99443] [GCOV] No coverage with "Aborted(core dumped)"

[njuwy at smail dot nju.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99443

--- Comment #3 from Yang Wang <njuwy at smail dot nju.edu.cn> ---
(In reply to Andrew Pinski from comment #2)
> This behavior might even be documented but I have not looked yet.

Thanks for your reply! So, this is expected (as well as bug 99442) rather than
a bug?

[Bug gcov-profile/99443] [GCOV] No coverage with "Aborted(core dumped)"

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99443

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
It is not well documented though.
https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gcc/Gcov-and-Optimization.html#Gcov-and-Optimization
Long-running applications can use the __gcov_reset and __gcov_dump facilities
to restrict profile collection to the program region of interest. Calling
__gcov_reset(void) will clear all profile counters to zero, and calling
__gcov_dump(void) will cause the profile information collected at that point to
be dumped to .gcda output files. ** Instrumented applications use a static
destructor with priority 99 to invoke the __gcov_dump function.** Thus
__gcov_dump is executed after all user defined static destructors, as well as
handlers registered with atexit. If an executable loads a dynamic shared object
via dlopen functionality, -Wl,--dynamic-list-data is needed to dump all profile
data.

----- CUT ----

[Bug gcov-profile/99443] [GCOV] No coverage with "Aborted(core dumped)"

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99443

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Invalid then.