iOS启动优化

#import <libkern/OSAtomic.h>
#include <sanitizer/coverage_interface.h>
#include <dlfcn.h>

// 定义原子队列
static OSQueueHead sybmolList = OS_ATOMIC_QUEUE_INIT;
// 定义符号结构体
typedef struct {
    void *pc;
    void *next;
} SYNNode;
- (void)testSleep{
void __sanitizer_cov_trace_pc_guard_init(uint32_t *start,
                                                    uint32_t *stop) {
  static uint64_t N;  // Counter for the guards.
  if (start == stop || *start) return;  // Initialize only once.
  printf("INIT: %p %p\n", start, stop);
  for (uint32_t *x = start; x < stop; x++)
    *x = ++N;  // Guards should start from 1.
}

// 可以拦截一切的方法调用
void __sanitizer_cov_trace_pc_guard(uint32_t *guard) {
  if (!*guard) return;  // Duplicate the guard check.
  void *PC = __builtin_return_address(0);
    // 多线程访问数据的方法 线程安全
    // 创建结构体
    SYNNode * node = malloc(sizeof(SYNNode));
    *node = (SYNNode){PC,NULL};
    
    // 结构体入栈
    OSAtomicEnqueue(&sybmolList, node, offsetof(SYNNode, next));
}



- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    
    NSMutableArray<NSString *> *symbolNames = [NSMutableArray new];
    while(YES){
        SYNNode *node = OSAtomicDequeue(&sybmolList,  offsetof(SYNNode, next));
        if (node == NULL) {
            break;
        }
        Dl_info info;
        dladdr(node->pc, &info);
        NSString *name = @(info.dli_sname);
        
        // 给函数名称添加_
        BOOL isObjc = [name hasPrefix:@"+["] || [name hasPrefix:@"-["];
        NSString *symbolName = isObjc ? name :[@"_" stringByAppendingString:name];
        [symbolNames addObject:symbolName];
    }
    NSEnumerator *em = [symbolNames reverseObjectEnumerator];
    NSMutableArray *funcs = [NSMutableArray arrayWithCapacity:symbolNames.count];
    
    NSString *name;
    // 有序去重
    while (name = [em nextObject]) {
        if(![funcs containsObject:name]) {
            [funcs addObject:name];
        }
    }
    
    //去掉自己
    [funcs removeObject:[NSString stringWithFormat:@"%s",__func__]];
    
    // 写入文件
    // 转成字符串
    NSString * funcStr = [funcs componentsJoinedByString:@"\n"];
    NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"caoliang.order"];
    
    // 转成二进制
    NSData *file = [funcStr dataUsingEncoding:NSUTF8StringEncoding];
    [[NSFileManager defaultManager] createFileAtPath:filePath contents:file attributes:nil];
    
    NSLog(@"%@",funcStr);
}
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