added files via upload

Tweaks/FLEX/Utility/Runtime/Objc/FLEXObjcInternal.h

@@ -0,0 +1,73 @@
+//
+//  FLEXObjcInternal.h
+//  FLEX
+//
+//  Created by Tanner Bennett on 11/1/18.
+//
+
+#import <Foundation/Foundation.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// The macros below are copied straight from
+// objc-internal.h, objc-private.h, objc-object.h, and objc-config.h with
+// as few modifications as possible. Changes are noted in boxed comments.
+// https://opensource.apple.com/source/objc4/objc4-723/
+// https://opensource.apple.com/source/objc4/objc4-723/runtime/objc-internal.h.auto.html
+// https://opensource.apple.com/source/objc4/objc4-723/runtime/objc-object.h.auto.html
+
+/////////////////////
+// objc-internal.h //
+/////////////////////
+
+#if __LP64__
+#define OBJC_HAVE_TAGGED_POINTERS 1
+#endif
+
+#if OBJC_HAVE_TAGGED_POINTERS
+
+#if TARGET_OS_OSX && __x86_64__
+// 64-bit Mac - tag bit is LSB
+#   define OBJC_MSB_TAGGED_POINTERS 0
+#else
+// Everything else - tag bit is MSB
+#   define OBJC_MSB_TAGGED_POINTERS 1
+#endif
+
+#if OBJC_MSB_TAGGED_POINTERS
+#   define _OBJC_TAG_MASK (1UL<<63)
+#   define _OBJC_TAG_EXT_MASK (0xfUL<<60)
+#else
+#   define _OBJC_TAG_MASK 1UL
+#   define _OBJC_TAG_EXT_MASK 0xfUL
+#endif
+
+#endif // OBJC_HAVE_TAGGED_POINTERS
+
+//////////////////////////////////////
+// originally _objc_isTaggedPointer //
+//////////////////////////////////////
+NS_INLINE BOOL flex_isTaggedPointer(const void *ptr)  {
+    #if OBJC_HAVE_TAGGED_POINTERS
+        return ((uintptr_t)ptr & _OBJC_TAG_MASK) == _OBJC_TAG_MASK;
+    #else
+        return NO;
+    #endif
+}
+
+#define FLEXPointerIsTaggedPointer(obj) flex_isTaggedPointer((__bridge void *)obj)
+
+BOOL FLEXPointerIsReadable(const void * ptr);
+
+/// @brief Assumes memory is valid and readable.
+/// @discussion objc-internal.h, objc-private.h, and objc-config.h
+/// https://blog.timac.org/2016/1124-testing-if-an-arbitrary-pointer-is-a-valid-objective-c-object/
+/// https://llvm.org/svn/llvm-project/lldb/trunk/examples/summaries/cocoa/objc_runtime.py
+/// https://blog.timac.org/2016/1124-testing-if-an-arbitrary-pointer-is-a-valid-objective-c-object/
+BOOL FLEXPointerIsValidObjcObject(const void * ptr);
+
+#ifdef __cplusplus
+}
+#endif