71 changes: 67 additions & 4 deletions clang/test/Sema/atomic-ops.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,10 +2,7 @@

// Basic parsing/Sema tests for __c11_atomic_*

typedef enum memory_order {
memory_order_relaxed, memory_order_consume, memory_order_acquire,
memory_order_release, memory_order_acq_rel, memory_order_seq_cst
} memory_order;
#include <stdatomic.h>

struct S { char c[3]; };

Expand Down Expand Up @@ -40,6 +37,14 @@ _Static_assert(__atomic_is_lock_free(8, 0), "");
_Static_assert(__atomic_is_lock_free(16, 0), ""); // expected-error {{not an integral constant expression}}
_Static_assert(__atomic_is_lock_free(17, 0), ""); // expected-error {{not an integral constant expression}}

_Static_assert(atomic_is_lock_free((atomic_char*)0), "");
_Static_assert(atomic_is_lock_free((atomic_short*)0), "");
_Static_assert(atomic_is_lock_free((atomic_int*)0), "");
_Static_assert(atomic_is_lock_free((atomic_long*)0), "");
// expected-error@+1 {{__int128 is not supported on this target}}
_Static_assert(atomic_is_lock_free((_Atomic(__int128)*)0), ""); // expected-error {{not an integral constant expression}}
_Static_assert(atomic_is_lock_free(0 + (atomic_char*)0), "");

char i8;
short i16;
int i32;
Expand Down Expand Up @@ -171,6 +176,62 @@ void f(_Atomic(int) *i, _Atomic(int*) *p, _Atomic(float) *d,
__c11_atomic_init(&const_atomic, 0); // expected-error {{address argument to atomic operation must be a pointer to non-const _Atomic type ('const _Atomic(int) *' invalid)}}
__c11_atomic_store(&const_atomic, 0, memory_order_release); // expected-error {{address argument to atomic operation must be a pointer to non-const _Atomic type ('const _Atomic(int) *' invalid)}}
__c11_atomic_load(&const_atomic, memory_order_acquire); // expected-error {{address argument to atomic operation must be a pointer to non-const _Atomic type ('const _Atomic(int) *' invalid)}}

// Ensure the <stdatomic.h> macros behave appropriately.
atomic_int n = ATOMIC_VAR_INIT(123);
atomic_init(&n, 456);
atomic_init(&n, (void*)0); // expected-warning {{passing 'void *' to parameter of type 'int'}}

const atomic_wchar_t cawt;
atomic_init(&cawt, L'x'); // expected-error {{non-const}}
atomic_wchar_t awt;
atomic_init(&awt, L'x');

int x = kill_dependency(12);

atomic_thread_fence(); // expected-error {{too few arguments to function call}}
atomic_thread_fence(memory_order_seq_cst);
atomic_signal_fence(memory_order_seq_cst);
void (*pfn)(memory_order) = &atomic_thread_fence;
pfn = &atomic_signal_fence;

int k = atomic_load_explicit(&n, memory_order_relaxed);
atomic_store_explicit(&n, k, memory_order_relaxed);
atomic_store(&n, atomic_load(&n));

k = atomic_exchange(&n, 72);
k = atomic_exchange_explicit(&n, k, memory_order_release);

atomic_compare_exchange_strong(&n, k, k); // expected-warning {{take the address with &}}
atomic_compare_exchange_weak(&n, &k, k);
atomic_compare_exchange_strong_explicit(&n, &k, k, memory_order_seq_cst); // expected-error {{too few arguments}}
atomic_compare_exchange_weak_explicit(&n, &k, k, memory_order_seq_cst, memory_order_acquire);

atomic_fetch_add(&k, n); // expected-error {{must be a pointer to _Atomic}}
k = atomic_fetch_add(&n, k);
k = atomic_fetch_sub(&n, k);
k = atomic_fetch_and(&n, k);
k = atomic_fetch_or(&n, k);
k = atomic_fetch_xor(&n, k);
k = atomic_fetch_add_explicit(&n, k, memory_order_acquire);
k = atomic_fetch_sub_explicit(&n, k, memory_order_release);
k = atomic_fetch_and_explicit(&n, k, memory_order_acq_rel);
k = atomic_fetch_or_explicit(&n, k, memory_order_consume);
k = atomic_fetch_xor_explicit(&n, k, memory_order_relaxed);

// C11 7.17.1/4: atomic_flag is a structure type.
struct atomic_flag must_be_struct = ATOMIC_FLAG_INIT;
// C11 7.17.8/5 implies that it is also a typedef type.
atomic_flag guard = ATOMIC_FLAG_INIT;
_Bool old_val = atomic_flag_test_and_set(&guard);
if (old_val) atomic_flag_clear(&guard);

old_val = (atomic_flag_test_and_set)(&guard);
if (old_val) (atomic_flag_clear)(&guard);

const atomic_flag const_guard;
atomic_flag_test_and_set(&const_guard); // expected-error {{address argument to atomic operation must be a pointer to non-const _Atomic type ('const atomic_bool *' (aka 'const _Atomic(_Bool) *') invalid)}}
atomic_flag_clear(&const_guard); // expected-error {{address argument to atomic operation must be a pointer to non-const _Atomic type ('const atomic_bool *' (aka 'const _Atomic(_Bool) *') invalid)}}
}

_Atomic(int*) PR12527_a;
Expand Down Expand Up @@ -403,3 +464,5 @@ void memory_checks(_Atomic(int) *Ap, int *p, int val) {
(void)__atomic_compare_exchange_n(p, p, val, 0, memory_order_acq_rel, memory_order_relaxed);
(void)__atomic_compare_exchange_n(p, p, val, 0, memory_order_seq_cst, memory_order_relaxed);
}