Actual source code: ex2.c

  1: static char help[] = "Tests checking pointers.\n\n";

  3: #include <petscsys.h>
  4: #include <petsc/private/petscimpl.h>

  6: int main(int argc, char *args[])
  7: {
  8:   PetscInt *ptr;

 10:   PetscFunctionBeginUser;
 11:   PetscCall(PetscInitialize(&argc, &args, NULL, help));
 12:   if (!PETSC_RUNNING_ON_VALGRIND) {                /* PetscCheckPointer always returns TRUE when running on Valgrind */
 13:     PetscCall(PetscMalloc(1024 * 1024 * 8, &ptr)); /* Almost certainly larger than MMAP_THRESHOLD (128 KiB by default) */
 14:     if (!PetscCheckPointer(ptr, PETSC_INT)) PetscCall(PetscPrintf(PETSC_COMM_SELF, "Mistook valid pointer %p for invalid pointer\n", (void *)ptr));
 15:     PetscCall(PetscFree(ptr));
 16:     if (PetscCheckPointer(ptr, PETSC_INT)) PetscCall(PetscPrintf(PETSC_COMM_SELF, "Mistook NULL pointer for valid pointer\n"));
 17:     ptr = (PetscInt *)~(PETSC_UINTPTR_T)0xf; /* Pointer will almost certainly be invalid */
 18:     if (PetscCheckPointer(ptr, PETSC_INT)) PetscCall(PetscPrintf(PETSC_COMM_SELF, "Mistook invalid pointer %p for valid\n", (void *)ptr));
 19:   }
 20:   PetscCall(PetscFinalize());
 21:   return 0;
 22: }

 24: /*TEST

 26:    test:
 27:      args: -check_pointer_intensity 1
 28:      TODO: reports Mistook invalid pointer 0xfffffffffffffff0 for valid or Free'd pointer is still accessible

 30: TEST*/