added files via upload

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

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+//
+//  FLEXRuntimeSafety.h
+//  FLEX
+//
+//  Created by Tanner on 3/25/17.
+//
+
+#import <Foundation/Foundation.h>
+#import <objc/runtime.h>
+
+#pragma mark - Classes
+
+extern NSUInteger const kFLEXKnownUnsafeClassCount;
+extern const Class * FLEXKnownUnsafeClassList(void);
+extern NSSet * FLEXKnownUnsafeClassNames(void);
+extern CFSetRef FLEXKnownUnsafeClasses;
+
+static Class cNSObject = nil, cNSProxy = nil;
+
+__attribute__((constructor))
+static void FLEXInitKnownRootClasses(void) {
+    cNSObject = [NSObject class];
+    cNSProxy = [NSProxy class];
+}
+
+static inline BOOL FLEXClassIsSafe(Class cls) {
+    // Is it nil or known to be unsafe?
+    if (!cls || CFSetContainsValue(FLEXKnownUnsafeClasses, (__bridge void *)cls)) {
+        return NO;
+    }
+    
+    // Is it a known root class?
+    if (!class_getSuperclass(cls)) {
+        return cls == cNSObject || cls == cNSProxy;
+    }
+    
+    // Probably safe
+    return YES;
+}
+
+static inline BOOL FLEXClassNameIsSafe(NSString *cls) {
+    if (!cls) return NO;
+    
+    NSSet *ignored = FLEXKnownUnsafeClassNames();
+    return ![ignored containsObject:cls];
+}
+
+#pragma mark - Ivars
+
+extern CFSetRef FLEXKnownUnsafeIvars;
+
+static inline BOOL FLEXIvarIsSafe(Ivar ivar) {
+    if (!ivar) return NO;
+
+    return !CFSetContainsValue(FLEXKnownUnsafeIvars, ivar);
+}