enable MAP_JIT only if mojave or later
diff --git a/xbyak/xbyak.h b/xbyak/xbyak.h
index a534334..b34df20 100644
--- a/xbyak/xbyak.h
+++ b/xbyak/xbyak.h
@@ -83,6 +83,10 @@
#include <sys/mman.h>
#include <stdlib.h>
#endif
+#if defined(__APPLE__) && defined(MAP_JIT)
+ #define XBYAK_USE_MAP_JIT
+ #include <sys/sysctl.h>
+#endif
#if !defined(_MSC_VER) || (_MSC_VER >= 1600)
#include <stdint.h>
#endif
@@ -328,6 +332,29 @@
};
#ifdef XBYAK_USE_MMAP_ALLOCATOR
+#ifdef XBYAK_USE_MAP_JIT
+namespace util {
+
+inline int getMacOsVersionPure()
+{
+ char buf[64];
+ size_t size = sizeof(buf);
+ int err = sysctlbyname("kern.osrelease", buf, &size, NULL, 0);
+ if (err != 0) return 0;
+ char *endp;
+ int major = strtol(buf, &endp, 10);
+ if (*endp != '.') return 0;
+ return major;
+}
+
+inline int getMacOsVersion()
+{
+ static const int version = getMacOsVersionPure();
+ return version;
+}
+
+} // util
+#endif
class MmapAllocator : Allocator {
typedef XBYAK_STD_UNORDERED_MAP<uintptr_t, size_t> SizeList;
SizeList sizeList_;
@@ -336,8 +363,10 @@
{
const size_t alignedSizeM1 = inner::ALIGN_PAGE_SIZE - 1;
size = (size + alignedSizeM1) & ~alignedSizeM1;
-#if defined(__APPLE__) && defined(MAP_JIT)
- const int mode = MAP_PRIVATE | MAP_ANONYMOUS | MAP_JIT;
+#if defined(XBYAK_USE_MAP_JIT)
+ int mode = MAP_PRIVATE | MAP_ANONYMOUS;
+ const int mojaveVersion = 18;
+ if (util::getMacOsVersion() >= mojaveVersion) mode |= MAP_JIT;
#elif defined(MAP_ANONYMOUS)
const int mode = MAP_PRIVATE | MAP_ANONYMOUS;
#elif defined(MAP_ANON)
