llvm-project/clang/test/Sema/builtin-counted-by-ref.c

// RUN: %clang_cc1 -std=c99 -fsyntax-only -verify %s

typedef unsigned long int size_t;

int global_array[42];
int global_int;

struct fam_struct {
  int x;
  char count;
  int array[] __attribute__((counted_by(count)));
};

void g(char *);
void h(char);

void test1(struct fam_struct *ptr, int size, int idx) {
  size_t size_of = sizeof(__builtin_counted_by_ref(ptr->array));    // ok
  int align_of = __alignof(__builtin_counted_by_ref(ptr->array));   // ok
  size_t __ignored_assignment;

  *__builtin_counted_by_ref(ptr->array) = size;                     // ok
  *_Generic(__builtin_counted_by_ref(ptr->array),
           void *: &__ignored_assignment,
           default: __builtin_counted_by_ref(ptr->array)) = 42;     // ok
  h(*__builtin_counted_by_ref(ptr->array));                         // ok
}

void test2(struct fam_struct *ptr, int idx) {
  __builtin_counted_by_ref();                                       // expected-error {{too few arguments to function call, expected 1, have 0}}
  __builtin_counted_by_ref(ptr->array, ptr->x, ptr->count);         // expected-error {{too many arguments to function call, expected 1, have 3}}
}

void test3(struct fam_struct *ptr, int idx) {
  __builtin_counted_by_ref(&ptr->array[0]);                         // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  __builtin_counted_by_ref(&ptr->array[idx]);                       // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  __builtin_counted_by_ref(&ptr->array);                            // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  __builtin_counted_by_ref(ptr->x);                                 // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  __builtin_counted_by_ref(&ptr->x);                                // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  __builtin_counted_by_ref(global_array);                           // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  __builtin_counted_by_ref(global_int);                             // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  __builtin_counted_by_ref(&global_int);                            // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
}

void test4(struct fam_struct *ptr, int idx) {
  __builtin_counted_by_ref(ptr++->array);                           // expected-error {{'__builtin_counted_by_ref' argument cannot have side-effects}}
  __builtin_counted_by_ref(&ptr->array[idx++]);                     // expected-error {{'__builtin_counted_by_ref' argument cannot have side-effects}}
}

void *test5(struct fam_struct *ptr, int size, int idx) {
  char *ref = __builtin_counted_by_ref(ptr->array);                 // expected-error {{value returned by '__builtin_counted_by_ref' cannot be assigned to a variable}}
  char *int_ptr;
  char *p;

  ref = __builtin_counted_by_ref(ptr->array);                       // expected-error {{value returned by '__builtin_counted_by_ref' cannot be assigned to a variable}}
  g(__builtin_counted_by_ref(ptr->array));                          // expected-error {{value returned by '__builtin_counted_by_ref' cannot be passed into a function}}
  g(ref = __builtin_counted_by_ref(ptr->array));                    // expected-error {{value returned by '__builtin_counted_by_ref' cannot be assigned to a variable}}

  if ((ref = __builtin_counted_by_ref(ptr->array)))                 // expected-error {{value returned by '__builtin_counted_by_ref' cannot be assigned to a variable}}
    ;

  for (p = __builtin_counted_by_ref(ptr->array); p && *p; ++p)      // expected-error {{value returned by '__builtin_counted_by_ref' cannot be assigned to a variable}}
    ;

  return __builtin_counted_by_ref(ptr->array);                      // expected-error {{value returned by '__builtin_counted_by_ref' cannot be returned from a function}}
}

void test6(struct fam_struct *ptr, int size, int idx) {
  *(__builtin_counted_by_ref(ptr->array) + 4) = 37;                 // expected-error {{value returned by '__builtin_counted_by_ref' cannot be used in a binary expression}}
  __builtin_counted_by_ref(ptr->array)[3] = 37;                     // expected-error {{value returned by '__builtin_counted_by_ref' cannot be used in an array subscript expression}}
}

struct non_fam_struct {
  char x;
  long *pointer;
  int array[42];
  short count;
};

void *test7(struct non_fam_struct *ptr, int size) {
  *__builtin_counted_by_ref(ptr->array) = size                      // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  *__builtin_counted_by_ref(&ptr->array[0]) = size;                 // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  *__builtin_counted_by_ref(ptr->pointer) = size;                   // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
  *__builtin_counted_by_ref(&ptr->pointer[0]) = size;               // expected-error {{'__builtin_counted_by_ref' argument must reference a flexible array member}}
}

struct char_count {
  char count;
  int array[] __attribute__((counted_by(count)));
} *cp;

struct short_count {
  short count;
  int array[] __attribute__((counted_by(count)));
} *sp;

struct int_count {
  int count;
  int array[] __attribute__((counted_by(count)));
} *ip;

struct unsigned_count {
  unsigned count;
  int array[] __attribute__((counted_by(count)));
} *up;

struct long_count {
  long count;
  int array[] __attribute__((counted_by(count)));
} *lp;

struct unsigned_long_count {
  unsigned long count;
  int array[] __attribute__((counted_by(count)));
} *ulp;

void test8(void) {
  _Static_assert(_Generic(__builtin_counted_by_ref(cp->array), char * : 1, default : 0) == 1, "wrong return type");
  _Static_assert(_Generic(__builtin_counted_by_ref(sp->array), short * : 1, default : 0) == 1, "wrong return type");
  _Static_assert(_Generic(__builtin_counted_by_ref(ip->array), int * : 1, default : 0) == 1, "wrong return type");
  _Static_assert(_Generic(__builtin_counted_by_ref(up->array), unsigned int * : 1, default : 0) == 1, "wrong return type");
  _Static_assert(_Generic(__builtin_counted_by_ref(lp->array), long * : 1, default : 0) == 1, "wrong return type");
  _Static_assert(_Generic(__builtin_counted_by_ref(ulp->array), unsigned long * : 1, default : 0) == 1, "wrong return type");
}