__attribute__ ((attribute-list)) 

format (archetype, string-index, first-to-check)

extern int my_printf (void *my_object, const char *my_format, ...) __attribute__((format(printf, 2, 3)));

FOUNDATION_EXPORT void NSLog(NSString *format, ...) NS_FORMAT_FUNCTION(1,2);
+ (instancetype)stringWithFormat:(NSString *)format, ... NS_FORMAT_FUNCTION(1,2);

__attribute__((constructor))
static void beforeMain(void) {
    NSLog(@"beforeMain");
}

__attribute__((constructor(101))) // 里面的数字越小优先级越高，1 ~ 100 为系统保留

__attribute__((destructor))
static void afterMain(void) {
    NSLog(@"afterMain");
}

// void(^block)(void)的指针是void(^*block)(void)
static void blockCleanUp(__strong void(^*block)(void)) {
    (*block)();
}

#define onExit    __strong void(^block)(void) __attribute__((cleanup(blockCleanUp), unused)) = ^

NSRecursiveLock *aLock = [[NSRecursiveLock alloc] init];
[aLock lock]; onExit { [aLock unlock]; };

lock.lock(); defer { lock.unlock() }

#define BeeHiveDATA(sectname) __attribute((used, section("__DATA,"#sectname" ")))

extern void *
my_memcpy (void *dest, const void *src, size_t len)
  __attribute__((nonnull (1, 2)));

- (int)addNum1:(int *)num1 num2:(int *)num2  __attribute__((nonnull (1,2))){//1,2表示第一个和第二个参数不能为空
    return  *num1 + *num2;
}

- (NSString *)getHost:(NSURL *)url __attribute__((nonnull (1))){//第一个参数不能为空
    return url.host;
}

__attribute__((objc_runtime_name("<#OtherClassName#>")))

 __attribute__((objc_runtime_name("OtherTest")))
 @interface Test : NSObject
 @end
 
 NSLog(@"%@", NSStringFromClass([Test class])); // "OtherTest"

+ (void) __attribute__((noreturn)) networkRequestThreadEntryPoint:(id)__unused object {
    do {
        @autoreleasepool {
            [[NSRunLoop currentRunLoop] run];
        }
    } while (YES);
}

void test(int a) __attribute__((always_inline));

- (BOOL)availiable __attribute__((warn_unused_result))
{
   return 10;
}

- (CGSize)sizeWithFont:(UIFont *)font NS_DEPRECATED_IOS(2_0, 7_0, "Use -sizeWithAttributes:") __TVOS_PROHIBITED;

//来看一下 后边的宏
 #define NS_DEPRECATED_IOS(_iosIntro, _iosDep, ...) CF_DEPRECATED_IOS(_iosIntro, _iosDep, __VA_ARGS__)

define CF_DEPRECATED_IOS(_iosIntro, _iosDep, ...) __attribute__((availability(ios,introduced=_iosIntro,deprecated=_iosDep,message="" __VA_ARGS__)))

//宏展开以后如下
__attribute__((availability(ios,introduced=2_0,deprecated=7_0,message=""__VA_ARGS__)));
//ios即是iOS平台
//introduced 从哪个版本开始使用
//deprecated 从哪个版本开始弃用
//message    警告的消息

//如果经常用,建议定义成类似系统的宏
- (void)oldMethod:(NSString *)string __attribute__((availability(ios,introduced=2_0,deprecated=7_0,message="用 -newMethod: 这个方法替代 "))){
    NSLog(@"我是旧方法,不要调我");
}

- (void)newMethod:(NSString *)string{
    NSLog(@"我是新方法");
}

@available(iOS 6.0, *)
    public var minimumScaleFactor: CGFloat // default is 0.0

//系统的宏,可以直接拿来用
 #define UNAVAILABLE_ATTRIBUTE __attribute__((unavailable))

 #define NS_UNAVAILABLE UNAVAILABLE_ATTRIBUTE

@interface Person : NSObject

@property(nonatomic,copy) NSString *name;

@property(nonatomic,assign) NSUInteger age;

- (instancetype)init NS_UNAVAILABLE;

- (instancetype)initWithName:(NSString *)name age:(NSUInteger)age;

@end

//系统的
 #define NS_AUTOMATED_REFCOUNT_UNAVAILABLE __attribute__((unavailable("not available in automatic reference counting mode")))

__attribute__((overloadable)) void print(NSString *string){
    NSLog(@"%@",string);
}

__attribute__((overloadable)) void print(int num){
    NSLog(@"%d",num);
}

static void __attribute__ ((constructor)) Initer() {
    Class class = NSClassFromString(@"AnnotationDemo.MyInitThingy");
    SEL selector = NSSelectorFromString(@"appWillLaunch:");

    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

    [center addObserver:class
               selector:selector
                   name:UIApplicationDidFinishLaunchingNotification
                 object:nil];
}

class MyInitThingy: NSObject {
    @objc static func appWillLaunch(_: Notification) {
        print("App Will Launch")
    }
}

// 通过BeeHiveMod宏进行Annotation标记

#ifndef BeehiveModSectName

#define BeehiveModSectName "BeehiveMods"

#endif

#ifndef BeehiveServiceSectName

#define BeehiveServiceSectName "BeehiveServices"

#endif


#define BeeHiveDATA(sectname) __attribute((used, section("__DATA,"#sectname" ")))


// 这里我们就把数据存在data数据段里面的"BeehiveMods"段中
#define BeeHiveMod(name) class BeeHive; char * k##name##_mod BeeHiveDATA(BeehiveMods) = ""#name"";


#define BeeHiveService(servicename,impl) class BeeHive; char * k##servicename##_service BeeHiveDATA(BeehiveServices) = "{ \""#servicename"\" : \""#impl"\"}";

@interface BHAnnotation : NSObject

@end

SArray<NSString *>* BHReadConfiguration(char *sectionName,const struct mach_header *mhp);
static void dyld_callback(const struct mach_header *mhp, intptr_t vmaddr_slide)
{
    NSArray *mods = BHReadConfiguration(BeehiveModSectName, mhp);
    for (NSString *modName in mods) {
        Class cls;
        if (modName) {
            cls = NSClassFromString(modName);
            
            if (cls) {
                [[BHModuleManager sharedManager] registerDynamicModule:cls];
            }
        }
    }
    
    //register services
    NSArray<NSString *> *services = BHReadConfiguration(BeehiveServiceSectName,mhp);
    for (NSString *map in services) {
        NSData *jsonData =  [map dataUsingEncoding:NSUTF8StringEncoding];
        NSError *error = nil;
        id json = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
        if (!error) {
            if ([json isKindOfClass:[NSDictionary class]] && [json allKeys].count) {
                
                NSString *protocol = [json allKeys][0];
                NSString *clsName  = [json allValues][0];
                
                if (protocol && clsName) {
                    [[BHServiceManager sharedManager] registerService:NSProtocolFromString(protocol) implClass:NSClassFromString(clsName)];
                }
                
            }
        }
    }
    
}
__attribute__((constructor))
void initProphet() {
    _dyld_register_func_for_add_image(dyld_callback);
}

NSArray<NSString *>* BHReadConfiguration(char *sectionName,const struct mach_header *mhp)
{
    NSMutableArray *configs = [NSMutableArray array];
    unsigned long size = 0;
#ifndef __LP64__
    uintptr_t *memory = (uintptr_t*)getsectiondata(mhp, SEG_DATA, sectionName, &size);
#else
    const struct mach_header_64 *mhp64 = (const struct mach_header_64 *)mhp;
    uintptr_t *memory = (uintptr_t*)getsectiondata(mhp64, SEG_DATA, sectionName, &size);
#endif
    
    unsigned long counter = size/sizeof(void*);
    for(int idx = 0; idx < counter; ++idx){
        char *string = (char*)memory[idx];
        NSString *str = [NSString stringWithUTF8String:string];
        if(!str)continue;
        
        BHLog(@"config = %@", str);
        if(str) [configs addObject:str];
    }
    
    return configs;

    
}

@implementation BHAnnotation

@end

@BeeHiveMod(ShopModule)
@interface ShopModule() <BHModuleProtocol>

@end
@implementation ShopModule

#define save() __asm volatile (     "stp x8, x9, [sp, #-16]!\n"     "stp x6, x7, [sp, #-16]!\n"     "stp x4, x5, [sp, #-16]!\n"     "stp x2, x3, [sp, #-16]!\n"     "stp x0, x1, [sp, #-16]!\n");

#define resume() __asm volatile (     "ldp x0, x1, [sp], #16\n"     "ldp x2, x3, [sp], #16\n"     "ldp x4, x5, [sp], #16\n"     "ldp x6, x7, [sp], #16\n"     "ldp x8, x9, [sp], #16\n" );
    
#define call(b, value)     __asm volatile ("stp x8, x9, [sp, #-16]!\n");     __asm volatile ("mov x12, %0\n" :: "r"(value));     __asm volatile ("ldp x8, x9, [sp], #16\n");     __asm volatile (#b " x12\n");


__attribute__((__naked__)) static void hook_Objc_msgSend() {

    save()
    __asm volatile ("mov x2, lr\n");
    __asm volatile ("mov x3, x4\n");
    
    call(blr, &push_msgSend)
    resume()
    call(blr, orig_objc_msgSend)
    
    save()
    call(blr, &pop_msgSend)
    
    __asm volatile ("mov lr, x0\n");
    resume()
    __asm volatile ("ret\n");
}