一、首先获取 重排后方法执行顺序
.h 文件

import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface SymbolTools : NSObject
///写入启动完成时 调用的符号表

• (void)writeSymobol;

@end

NS_ASSUME_NONNULL_END
.m 文件

import "SymbolTools.h"

include <stdint.h>

include <stdio.h>

include <sanitizer/coverage_interface.h>

import <dlfcn.h>

import <libkern/OSAtomicQueue.h>

@implementation SymbolTools
//原子队列
static OSQueueHead symbolist = OS_ATOMIC_QUEUE_INIT;
//存放符号表的结构体
typedef struct {
void *pc; //当前函数栈信息
void *next; //下个函数栈信息
}SYNode;
//根据stop 地址偏移可以算出调用函数个数 ---暂时用不到,但是必须实现该函数,因为clang 会调用
void __sanitizer_cov_trace_pc_guard_init(uint32_t *start,
uint32_t *stop) {
if (start == stop || *start) return; // Initialize only once.
printf("INIT: %p %p\n", start, stop);

}
//返回函数调用地址 ->寄存器即将调用的下个函数地址
void __sanitizer_cov_trace_pc_guard(uint32_t *guard) {
void *PC = __builtin_return_address(0);
SYNode *node = malloc(sizeof(SYNode));
*node = (SYNode){PC,NULL};
//进入
OSAtomicEnqueue(&symbolist, node, offsetof(SYNode,next));

}

pragma 文件写入

• (void)writeSymobol{
  NSMutableArray <NSString *> *symbolAry = [NSMutableArray array];
  while (YES) {
  SYNode *node = OSAtomicDequeue(&symbolist, offsetof(SYNode, next));
  if (node == NULL) {
  break;
  }
  //存放函数信息的结构体
  Dl_info info;
  dladdr(node->pc,&info);
  NSString *name = @(info.dli_sname);
  BOOL isObjc = [name hasPrefix:@"-["] || [name hasPrefix:@"+["];
  NSString *symbolName = isObjc?name:[@"" stringByAppendingString:name]; //非oc符号 缺少''
  [symbolAry addObject:symbolName];
  }
  //字符串颠倒顺序,因为结构体加入的时候 类似栈的形式先进后出
  NSArray *resultAry = [[symbolAry reverseObjectEnumerator] allObjects];
  //由于方法会被多次调用,需要去重
  [symbolAry removeAllObjects];
  for (NSString *symbolName in resultAry) {
  if (![symbolAry containsObject:symbolName]) {
  [symbolAry addObject:symbolName];
  }
  }
  [symbolAry removeObject:[NSString stringWithFormat:@"%s",FUNCTION]]; //移除本方法
  //写入文件
  NSString *symbols = [symbolAry componentsJoinedByString:@"\n"];
  NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"pdmi.order"];
  NSData *fileConten = [symbols dataUsingEncoding:NSUTF8StringEncoding];
  [[NSFileManager defaultManager] createFileAtPath:filePath contents:fileConten attributes:nil];
  NSLog(@"filePath == %@",filePath);
  }
  @end

二、配置顺序方法执行条件 -fsanitize-coverage=func,trace-pc-guard

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三、按路径取到文件 放到工程目录中 然后配置参数

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