ios64-xcrun openssl build.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4510 ed5197a5-7fde-0310-b194-c3ffbd925b24

deps/openssl/ios/ios64-xcrun/usr/local/include/internal/refcount.h

@@ -0,0 +1,178 @@
+/*
+ * Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+#ifndef OSSL_INTERNAL_REFCOUNT_H
+# define OSSL_INTERNAL_REFCOUNT_H
+# pragma once
+
+# include <openssl/e_os2.h>
+# include <openssl/trace.h>
+
+# if defined(OPENSSL_THREADS) && !defined(OPENSSL_DEV_NO_ATOMICS)
+#  if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L \
+      && !defined(__STDC_NO_ATOMICS__)
+#   include <stdatomic.h>
+#   define HAVE_C11_ATOMICS
+#  endif
+
+#  if defined(HAVE_C11_ATOMICS) && defined(ATOMIC_INT_LOCK_FREE) \
+      && ATOMIC_INT_LOCK_FREE > 0
+
+#   define HAVE_ATOMICS 1
+
+typedef _Atomic int CRYPTO_REF_COUNT;
+
+static inline int CRYPTO_UP_REF(_Atomic int *val, int *ret,
+                                ossl_unused void *lock)
+{
+    *ret = atomic_fetch_add_explicit(val, 1, memory_order_relaxed) + 1;
+    return 1;
+}
+
+/*
+ * Changes to shared structure other than reference counter have to be
+ * serialized. And any kind of serialization implies a release fence. This
+ * means that by the time reference counter is decremented all other
+ * changes are visible on all processors. Hence decrement itself can be
+ * relaxed. In case it hits zero, object will be destructed. Since it's
+ * last use of the object, destructor programmer might reason that access
+ * to mutable members doesn't have to be serialized anymore, which would
+ * otherwise imply an acquire fence. Hence conditional acquire fence...
+ */
+static inline int CRYPTO_DOWN_REF(_Atomic int *val, int *ret,
+                                  ossl_unused void *lock)
+{
+    *ret = atomic_fetch_sub_explicit(val, 1, memory_order_relaxed) - 1;
+    if (*ret == 0)
+        atomic_thread_fence(memory_order_acquire);
+    return 1;
+}
+
+#  elif defined(__GNUC__) && defined(__ATOMIC_RELAXED) && __GCC_ATOMIC_INT_LOCK_FREE > 0
+
+#   define HAVE_ATOMICS 1
+
+typedef int CRYPTO_REF_COUNT;
+
+static __inline__ int CRYPTO_UP_REF(int *val, int *ret, ossl_unused void *lock)
+{
+    *ret = __atomic_fetch_add(val, 1, __ATOMIC_RELAXED) + 1;
+    return 1;
+}
+
+static __inline__ int CRYPTO_DOWN_REF(int *val, int *ret,
+                                      ossl_unused void *lock)
+{
+    *ret = __atomic_fetch_sub(val, 1, __ATOMIC_RELAXED) - 1;
+    if (*ret == 0)
+        __atomic_thread_fence(__ATOMIC_ACQUIRE);
+    return 1;
+}
+#  elif defined(__ICL) && defined(_WIN32)
+#   define HAVE_ATOMICS 1
+typedef volatile int CRYPTO_REF_COUNT;
+
+static __inline int CRYPTO_UP_REF(volatile int *val, int *ret,
+                                  ossl_unused void *lock)
+{
+    *ret = _InterlockedExchangeAdd((void *)val, 1) + 1;
+    return 1;
+}
+
+static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret,
+                                    ossl_unused void *lock)
+{
+    *ret = _InterlockedExchangeAdd((void *)val, -1) - 1;
+    return 1;
+}
+
+#  elif defined(_MSC_VER) && _MSC_VER>=1200
+
+#   define HAVE_ATOMICS 1
+
+typedef volatile int CRYPTO_REF_COUNT;
+
+#   if (defined(_M_ARM) && _M_ARM>=7 && !defined(_WIN32_WCE)) || defined(_M_ARM64)
+#    include <intrin.h>
+#    if defined(_M_ARM64) && !defined(_ARM_BARRIER_ISH)
+#     define _ARM_BARRIER_ISH _ARM64_BARRIER_ISH
+#    endif
+
+static __inline int CRYPTO_UP_REF(volatile int *val, int *ret,
+                                  ossl_unused void *lock)
+{
+    *ret = _InterlockedExchangeAdd_nf(val, 1) + 1;
+    return 1;
+}
+
+static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret,
+                                    ossl_unused void *lock)
+{
+    *ret = _InterlockedExchangeAdd_nf(val, -1) - 1;
+    if (*ret == 0)
+        __dmb(_ARM_BARRIER_ISH);
+    return 1;
+}
+#   else
+#    if !defined(_WIN32_WCE)
+#     pragma intrinsic(_InterlockedExchangeAdd)
+#    else
+#     if _WIN32_WCE >= 0x600
+       extern long __cdecl _InterlockedExchangeAdd(long volatile*, long);
+#     else
+       /* under Windows CE we still have old-style Interlocked* functions */
+       extern long __cdecl InterlockedExchangeAdd(long volatile*, long);
+#      define _InterlockedExchangeAdd InterlockedExchangeAdd
+#     endif
+#    endif
+
+static __inline int CRYPTO_UP_REF(volatile int *val, int *ret,
+                                  ossl_unused void *lock)
+{
+    *ret = _InterlockedExchangeAdd(val, 1) + 1;
+    return 1;
+}
+
+static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret,
+                                    ossl_unused void *lock)
+{
+    *ret = _InterlockedExchangeAdd(val, -1) - 1;
+    return 1;
+}
+#   endif
+
+#  endif
+# endif  /* !OPENSSL_DEV_NO_ATOMICS */
+
+/*
+ * All the refcounting implementations above define HAVE_ATOMICS, so if it's
+ * still undefined here (such as when OPENSSL_DEV_NO_ATOMICS is defined), it
+ * means we need to implement a fallback.  This fallback uses locks.
+ */
+# ifndef HAVE_ATOMICS
+
+typedef int CRYPTO_REF_COUNT;
+
+# define CRYPTO_UP_REF(val, ret, lock) CRYPTO_atomic_add(val, 1, ret, lock)
+# define CRYPTO_DOWN_REF(val, ret, lock) CRYPTO_atomic_add(val, -1, ret, lock)
+
+# endif
+
+# if !defined(NDEBUG) && !defined(OPENSSL_NO_STDIO)
+#  define REF_ASSERT_ISNT(test) \
+    (void)((test) ? (OPENSSL_die("refcount error", __FILE__, __LINE__), 1) : 0)
+# else
+#  define REF_ASSERT_ISNT(i)
+# endif
+
+# define REF_PRINT_EX(text, count, object) \
+    OSSL_TRACE3(REF_COUNT, "%p:%4d:%s\n", (object), (count), (text));
+# define REF_PRINT_COUNT(text, object) \
+    REF_PRINT_EX(text, object->references, (void *)object)
+
+#endif