线上的CrashLog利用UserTrack的搜集的话一般都无法识别,比如

3   XXX                          0x00126adf XXX + 1006303
4   XXX                          0x0005ff49 XXX + 192329
5   Foundation                          0x33a864a1 <redacted> + 460
6   CoreFoundation                      0x331438f7 <redacted> + 14
7   CoreFoundation                      0x331431f3 <redacted> + 362

那么怎么去识别这种CrashLog呢?

Mac提供了一个dwarfdump的小工具来解析这种CrashLog,需要dSYM的配合

利用dwarfdump --lookup=ADDRESS DSYMFILE 的方式查找crash出错的地址在DSYM文件中的代码段

我这里提供一个Python的小工具,直接输入address offset(就是上面的堆栈里+号后面的那个数字),生成一个可读的堆栈

#!/usr/bin/python
# wentong@taobao.com
# 13-5-3
#
import optparse
import os

DSYM = ""

def map_hex(x):
    return """dwarfdump --lookup=%s %s|grep -E "start_addr:|Line table file:";echo -------------------; """ % (
        hex(0x00001000 + int(x)), DSYM)

def add(x, y):
    return x + y

if __name__ == '__main__':
    parser = optparse.OptionParser()
    parser.add_option("-l", "--list", dest="list",
                      help="addresses of the backtrace")

    parser.add_option("-d", "--dsym", dest="dsym",
                      help="the file of dSYM")

    (options, args) = parser.parse_args()
    if options.list is not None and options.dsym is not None:
        DSYM = options.dsym
        alist = map(map_hex, options.list.split(','))
        command = reduce(add, alist)
        # print command
        os.system(command)
        pass
    else:
        parser.print_help()

使用方法就是

iOSCrashAnalyza.py -l1067213,1006303,192329,11307 -d/Users/zephyrleaves/crash/XXX.app.dSYM

其中l后面就是跟 3 XXX 0x00126adf XXX + 1006303 这行中的1006303 这个数字

直接输出

Line table file: 'XXXX.m' line 74, column 56 with start address 0x00000000001058bc
    start_addr: 0x0010581c YYYY
-------------------
Line table file: 'AAAA.m' line 182, column 5 with start address 0x00000000000f6aae
    start_addr: 0x000f659c -[AAAA BBBB:]
-------------------
Line table file: 'CCCC.m' line 2028, column 2 with start address 0x000000000002ff48
    start_addr: 0x0002fef8 -[CCCC DDDD]
-------------------
Line table file: 'main.m' line 16, column 51 with start address 0x0000000000003bf6
    start_addr: 0x00003be4 main
-------------------

这样的可读的堆栈了