获取启动到首页用到的方法符号
1.生成orderfile
各个target的other c flag （包括pod进来的）添加
-fsanitize-coverage=func,trace-pc-guard
另外对于swift项目或组件：
搜索 Other Swift Flags , 添加如下配置 :
-sanitize-coverage=func
-sanitize=undefined
然后，在需要输出orderfile的地方添加，项目中选择在首页的viewDidAppear添加
KMeetingGetOrderFileTool *tool = [[KMeetingGetOrderFileTool alloc] init];
[tool doTrigger];
KMeetingGetOrderFileTool.h文件：
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface KMeetingGetOrderFileTool : NSObject
- (instancetype)init;
-(void)doTrigger;
@end
KMeetingGetOrderFileTool.m文件：
NS_ASSUME_NONNULL_END
KMeetingGetOrderFileTool.m文件
#import "KMeetingGetOrderFileTool.h"
#import "dlfcn.h"
#import <libkern/OSAtomic.h>
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.
}
//原子队列
static OSQueueHead symboList = OS_ATOMIC_QUEUE_INIT;
static BOOL isEnd = NO;
//定义符号结构体
typedef struct{
void * pc;
void * next;
}SymbolNode;
void __sanitizer_cov_trace_pc_guard(uint32_t *guard) {
//if (!*guard) return; // Duplicate the guard check.
if (isEnd) {
return;
}
void *PC = __builtin_return_address(0);
SymbolNode * node = malloc(sizeof(SymbolNode));
*node = (SymbolNode){PC,NULL};
//入队
// offsetof 用在这里是为了入队添加下一个节点找到 前一个节点next指针的位置
OSAtomicEnqueue(&symboList, node, offsetof(SymbolNode, next));
}
@implementation KMeetingGetOrderFileTool
- (instancetype)init
{
self = [super init];
if (self) {
}
return self;
}
- (void)doTrigger {
isEnd = YES;
NSMutableArray<NSString *> * symbolNames = [NSMutableArray array];
while (true) {
//offsetof 就是针对某个结构体找到某个属性相对这个结构体的偏移量
SymbolNode * node = OSAtomicDequeue(&symboList, offsetof(SymbolNode, next));
if (node == NULL) break;
Dl_info info;
dladdr(node->pc, &info);
NSString * name = @(info.dli_sname);
// 添加 _
BOOL isObjc = [name hasPrefix:@"+["] || [name hasPrefix:@"-["];
NSString * symbolName = isObjc ? name : [@"_" stringByAppendingString:name];
//去重
if (![symbolNames containsObject:symbolName]) {
[symbolNames addObject:symbolName];
}
}
//取反
NSArray * symbolAry = [[symbolNames reverseObjectEnumerator] allObjects];
NSLog(@"%@",symbolAry);
//将结果写入到文件
NSString * funcString = [symbolAry componentsJoinedByString:@"\n"];
NSString * filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"fast.order"];
NSData * fileContents = [funcString dataUsingEncoding:NSUTF8StringEncoding];
BOOL result = [[NSFileManager defaultManager] createFileAtPath:filePath contents:fileContents attributes:nil];
if (result) {
NSLog(@"linkSymbol result %@",filePath);
}else{
NSLog(@"linkSymbol result文件写入出错");
}
}
@end
2.配置orderfile
将符号文件fast.order拷贝到项目跟目录，然后在build setting中的Order File设置${SRCROOT}/fast.order
