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Reland "Implement C++11-style GCC builtin atomic ops"

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Fixed the crasher in it.
This commit is contained in:
Behdad Esfahbod 2018-07-17 10:57:01 +02:00
parent 019d18e9ae
commit 04b7b81bcb
2 changed files with 20 additions and 4 deletions
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22
src/hb-atomic-private.hh
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@ -46,21 +46,37 @@
/* Defined externally, i.e. in config.h; must have typedef'ed hb_atomic_int_impl_t as well. */
#elif !defined(HB_NO_MT) && defined(__ATOMIC_ACQUIRE)
/* C++11-style GCC primitives. */
typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) __atomic_fetch_add (&(AI), (V), __ATOMIC_ACQ_REL)
#define hb_atomic_ptr_impl_get(P) __atomic_load_n ((P), __ATOMIC_ACQUIRE)
static inline bool
_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
{
const void *O = O_; // Need lvalue
return __atomic_compare_exchange_n ((void **) P, (void **) &O, (void *) N, true, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED);
}
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (_hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N)))
#elif !defined(HB_NO_MT) && __cplusplus >= 201103L
/* Prefer C++11 atomics. */
/* C++11 atomics. */
#include <atomic>
typedef int hb_atomic_int_impl_t;
#define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (&AI)->fetch_add (V, std::memory_order_acq_rel))
#define hb_atomic_int_impl_add(AI, V) (reinterpret_cast<std::atomic<int> *> (&AI)->fetch_add ((V), std::memory_order_acq_rel))
#define hb_atomic_ptr_impl_get(P) (reinterpret_cast<std::atomic<void*> *> (P)->load (std::memory_order_acquire))
static inline bool
_hb_atomic_ptr_impl_cmplexch (const void **P, const void *O_, const void *N)
{
const void *O = O_; // Need lvalue
return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak ((O), (N), std::memory_order_acq_rel);
return reinterpret_cast<std::atomic<const void*> *> (P)->compare_exchange_weak (O, N, std::memory_order_acq_rel, std::memory_order_relaxed);
}
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (_hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N)))

2
src/hb-object-private.hh
View File

@ -94,7 +94,7 @@ struct hb_user_data_array_t
struct hb_object_header_t
{
hb_reference_count_t ref_count;
hb_user_data_array_t *user_data;
mutable hb_user_data_array_t *user_data;
#define HB_OBJECT_HEADER_STATIC {HB_REFERENCE_COUNT_INIT, nullptr}