iOS性能优化之启动优化

Total pre-main time: 1.8 seconds (100.0%) 
    dylib loading time: 526.41 milliseconds (28.1%) 
    rebase/binding time: 165.85 milliseconds (8.8%)
    ObjC setup time: 324.80 milliseconds (17.3%)
    initializer time: 853.94 milliseconds (45.6%) 
    slowest intializers : 
    libSystem.B.dylib : 10.44 milliseconds (0.5%) 
    libMainThreadChecker.dylib : 58.23 milliseconds (3.1%) 
    libglInterpose.dylib : 318.94 milliseconds (17.0%) 
    AFNetworking : 39.55 milliseconds (2.1%)
    NELivePlayerFramework : 62.94 milliseconds (3.3%) 
    XXXXX : 369.68 milliseconds (19.7%)
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# Symbols: 
# Address Size File Name 
0x100005F80 0x0000002C [ 1] +[ViewController load] 
0x100005FAC 0x00000048 [ 1] -[ViewController viewDidLoad] 
0x100005FF4 0x0000007C [ 2] -[AppDelegate application:didFinishLaunchingWithOptions:] 
0x100006070 0x00000100 [ 2] -[AppDelegate application:configurationForConnectingSceneSession:options:] 
0x100006170 0x00000074 [ 2] -[AppDelegate application:didDiscardSceneSessions:] 
0x1000061E4 0x0000009C [ 3] _main 
0x100006280 0x0000009C [ 4] -[SceneDelegate scene:willConnectToSession:options:] 
0x10000631C 0x0000004C [ 4] -[SceneDelegate sceneDidDisconnect:] 
0x100006368 0x0000004C [ 4] -[SceneDelegate sceneDidBecomeActive:] 
0x1000063B4 0x0000004C [ 4] -[SceneDelegate sceneWillResignActive:]
0x100006400 0x0000004C [ 4] -[SceneDelegate sceneWillEnterForeground:] 
0x10000644C 0x0000004C [ 4] -[SceneDelegate sceneDidEnterBackground:] 
0x100006498 0x00000024 [ 4] -[SceneDelegate window] 
0x1000064BC 0x0000003C [ 4] -[SceneDelegate setWindow:] 
0x1000064F8 0x0000003C [ 4] -[SceneDelegate .cxx_destruct] 
0x100006534 0x0000000C [ 5] _NSLog ...
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+[ViewController load] 
+[AppDelegate load] 
_main
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# Symbols: 
# Address Size     File Name 
0x100005F54 0x0000002C [ 1] +[ViewController load] 
0x100005F80 0x0000002C [ 2] +[AppDelegate load] 
0x100005FAC 0x0000009C [ 3] _main 
0x100006048 0x00000048 [ 1] -[ViewController viewDidLoad] 
0x100006090 0x0000007C [ 2] -[AppDelegate application:didFinishLaunchingWithOptions:] 
...
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#import "ViewController.h"
#include <stdint.h> 
#include <stdio.h> 
#include <sanitizer/coverage_interface.h> 

@implementation ViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
} 

void __sanitizer_cov_trace_pc_guard_init(uint32_t *start, uint32_t *stop) {
    static uint64_t N; 
    if (start == stop || *start) return; 
    printf("INIT: %p %p\n", start, stop); 
    for (uint32_t *x = start; x < stop; x++)
        *x = ++N; 
} 
void __sanitizer_cov_trace_pc_guard(uint32_t *guard) { 
    if (!*guard) return; 
    
    void *PC = __builtin_return_address(0); 
    char PcDescr[1024]; 
    
    // printf("guard: %p %x PC %s\n", guard, *guard, PcDescr); 
} 

@end
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INIT: 0x100bbd4c0 0x100bbd4f8
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//读取start 
(lldb) x 0x100bbd4c0 
0x100bbd4c0: 01 00 00 00 02 00 00 00 03 00 00 00 04 00 00 00 ................ 
0x100bbd4d0: 05 00 00 00 06 00 00 00 07 00 00 00 08 00 00 00 ................ 

//读取stop 
(lldb) x 0x100bbd4f8-4 
0x100bbd4f4: 0e 00 00 00 c0 d2 e0 00 01 00 00 00 00 00 00 00 ................ 
0x100bbd504: 00 00 00 00 66 73 bb 00 01 00 00 00 00 00 00 00 ....fs..........
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void __sanitizer_cov_trace_pc_guard(uint32_t *guard) { 
    NSLog(@"__sanitizer_cov_trace_pc_guard"); 
} 

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ 
    NSLog(@"touchesBegan方法执行"); 
    test(); 
} 

void(^block)(void) = ^(void){ 
    NSLog(@"Block执行"); 
}; 

void test(){ 
    NSLog(@"test函数执行"); 
    block(); 
} 

------------------------- 
//输出以下内容：
__sanitizer_cov_trace_pc_guard 
touchesBegan方法执行 
__sanitizer_cov_trace_pc_guard 
test函数执行 
__sanitizer_cov_trace_pc_guard 
Block执行
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#include <dlfcn.h> 

void __sanitizer_cov_trace_pc_guard(uint32_t *guard) { 
    NSLog(@"__sanitizer_cov_trace_pc_guard"); 
    
    if (!*guard) return; 
    
    void *PC = __builtin_return_address(0);
    
    Dl_info info; 
    dladdr(PC, &info);
    
    NSLog(@"%s", info.dli_fname);
    NSLog(@"%p", info.dli_fbase); 
    NSLog(@"%s", info.dli_sname); 
    NSLog(@"%p", info.dli_saddr); 
}
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typedef struct dl_info { 
    const char *dli_fname; /* Pathname of shared object */
    void *dli_fbase; /* Base address of shared object */ 
    const char *dli_sname; /* Name of nearest symbol */ 
    void *dli_saddr; /* Address of nearest symbol */ 
} Dl_info;
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__sanitizer_cov_trace_pc_guard 
dli_fname：/private/var/containers/Bundle/Application/E4DBCC4F-B132-4462-A148-03B398B476F5/SanitizerCoverage.app/SanitizerCoverage 
dli_fbase：0x104cb0000 
dli_sname：-[ViewController touchesBegan:withEvent:] 
dli_saddr：0x104cb5a64
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#import "ViewController.h" 
#include <stdint.h> 
#include <stdio.h> 
#include <sanitizer/coverage_interface.h> 
#include <dlfcn.h> 

@interface ViewController () 

@end 

@implementation ViewController 

+ (void)load { 
    // NSLog(@"load函数");
} 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    test(); 
} 

void(^block)(void) = ^(void){ 
    // NSLog(@"Block执行"); 
}; 

void test(){ 
    // NSLog(@"test函数执行"); 
    block(); 
} 

void __sanitizer_cov_trace_pc_guard_init(uint32_t *start, uint32_t *stop) {
    static uint64_t N; 
    if (start == stop || *start) return; 
    for (uint32_t *x = start; x < stop; x++) 
    *x = ++N; 
} 

void __sanitizer_cov_trace_pc_guard(uint32_t *guard) { 
    void *PC = __builtin_return_address(0); 
    Dl_info info; dladdr(PC, &info); 
    NSLog(@"%s", info.dli_sname); 
} 

@end 

------------------------- 
//输出以下内容： 
+[ViewController load] 
main 
-[AppDelegate application:didFinishLaunchingWithOptions:] 
-[SceneDelegate window] 
-[SceneDelegate setWindow:] 
-[SceneDelegate window] 
-[SceneDelegate window] 
-[SceneDelegate scene:willConnectToSession:options:] 
-[SceneDelegate window] 
-[SceneDelegate window] 
-[SceneDelegate window] 
-[ViewController viewDidLoad] 
test 
block_block_invoke 
-[SceneDelegate sceneWillEnterForeground:] 
-[SceneDelegate sceneDidBecomeActive:]
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//定义原子队列 
static OSQueueHead symbolList = OS_ATOMIC_QUEUE_INIT; 

//定义结构体 
typedef struct { 
    void *pc; 
    void *next;
} SYNode; 

void __sanitizer_cov_trace_pc_guard(uint32_t *guard) { 
    void *PC = __builtin_return_address(0); 
    
    //创建结构体 
    SYNode *node = malloc(sizeof(SYNode));
    *node = (SYNode){PC, NULL};
    
    //结构体入栈 
    //offsetof：参数1传入类型，将下一个节点的地址返回给参数2 
    OSAtomicEnqueue(&symbolList, node, offsetof(SYNode, next));
} 

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    while (YES) { 
        SYNode *node = OSAtomicDequeue(&symbolList, offsetof(SYNode, next));
        
        //取空则停止循环 
        if(node == NULL){ 
            break; 
        } 
        Dl_info info; 
        dladdr(node->pc, &info); 
        NSLog(@"%s", info.dli_sname); 
    } 
}
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-[ViewController touchesBegan:withEvent:] 
-[SceneDelegate sceneDidBecomeActive:] 
-[SceneDelegate sceneWillEnterForeground:] 
block_block_invoke 
test 
-[ViewController viewDidLoad] 
-[SceneDelegate window] 
-[SceneDelegate window] 
-[SceneDelegate window] 
-[SceneDelegate scene:willConnectToSession:options:] 
-[SceneDelegate window] 
-[SceneDelegate window] 
-[SceneDelegate setWindow:] 
-[SceneDelegate window] 
-[AppDelegate application:didFinishLaunchingWithOptions:] 
main 
+[ViewController load]
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- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ 

    NSMutableArray<NSString *> *symbolNames = [NSMutableArray array];
    
    while (YES) { 
    
        SYNode *node = OSAtomicDequeue(&symbolList, offsetof(SYNode, next)); 
        
        if(node == NULL){ 
            break; 
        } 
        
        Dl_info info; 
        dladdr(node->pc, &info);
        
        NSString *name = @(info.dli_sname);
        
        if([name isEqualToString:@(__func__)]){
            continue; 
        } 
        
        if(![name hasPrefix:@"+["] && ![name hasPrefix:@"-["]){ 
            name = [@"_" stringByAppendingString:name]; 
        } 
        
        if([symbolNames containsObject:name]){ 
            continue; 
        } 
        
        [symbolNames addObject:name]; 
    } 
    
    symbolNames = (NSMutableArray<NSString *> *)[[symbolNames reverseObjectEnumerator] allObjects]; 
    
    for (NSString *symbol in symbolNames) {
        NSLog(@"%@", symbol); 
    } 
} 

------------------------- 
//输出以下内容： 
+[ViewController load] 
_main 
-[AppDelegate application:didFinishLaunchingWithOptions:] 
-[SceneDelegate setWindow:] 
-[SceneDelegate scene:willConnectToSession:options:] 
-[SceneDelegate window] 
-[ViewController viewDidLoad] 
_test 
_block_block_invoke 
-[SceneDelegate sceneWillEnterForeground:] 
-[SceneDelegate sceneDidBecomeActive:]
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- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ 

    NSMutableArray<NSString *> *symbolNames = [NSMutableArray array];
    
    while (YES) {
    
        SYNode *node = OSAtomicDequeue(&symbolList, offsetof(SYNode, next)); 
        
        if(node == NULL){ 
            break; 
        } 
        Dl_info info; 
        dladdr(node->pc, &info); 
        
        NSString *name = @(info.dli_sname); 
        
        if([name isEqualToString:@(__func__)]){ 
            continue; 
        } 
        
        if(![name hasPrefix:@"+["] && ![name hasPrefix:@"-["]){ 
            name = [@"_" stringByAppendingString:name]; 
        } 
        
        if([symbolNames containsObject:name]){ 
            continue; 
        } 
        
        [symbolNames addObject:name]; 
    } 
    symbolNames = (NSMutableArray<NSString *> *)[[symbolNames reverseObjectEnumerator] allObjects];
    
    NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"hk.order"];
    NSString *symbolStr = [symbolNames componentsJoinedByString:@"\n"]; 
    NSData *symbolData = [symbolStr dataUsingEncoding:kCFStringEncodingUTF8];
    [[NSFileManager defaultManager] createFileAtPath:filePath contents:symbolData attributes:nil];
    NSLog(@"%@", symbolStr);
}
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import Foundation 

class SwiftTest: NSObject { 

    @objc class func swiftTest1(){ 
    
    } 
    
    @objc class func swiftTest2(){ 
    
    } 
}
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+ (void)load { 
    [SwiftTest swiftTest1];
}

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    
    test(); 
} 

void(^block)(void) = ^(void){ 
    [SwiftTest swiftTest2]; 
}; 

void test(){ 
    block();
}
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+[ViewController load] 
_$s17SanitizerCoverage9SwiftTestC10swiftTest1yyFZTo 
_$s17SanitizerCoverage9SwiftTestC10swiftTest1yyFZ 
_main 
-[AppDelegate application:didFinishLaunchingWithOptions:] 
-[SceneDelegate setWindow:] 
-[SceneDelegate scene:willConnectToSession:options:]
-[SceneDelegate window] 
-[ViewController viewDidLoad]
_test 
_block_block_invoke 
_$s17SanitizerCoverage9SwiftTestC10swiftTest2yyFZTo
_$s17SanitizerCoverage9SwiftTestC10swiftTest2yyFZ
-[SceneDelegate sceneWillEnterForeground:] 
-[SceneDelegate sceneDidBecomeActive:]
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