zoukankan      html  css  js  c++  java
  • iOS crash分析

    iOS crash分析

    符号化(symbolicate)

    内存地址的解析, 是指从 内存地址符号

    Thread 21 Crashed:
    0   libsystem_kernel.dylib          0x00000001957b3270 0x195798000 + 111216
    1   libsystem_pthread.dylib         0x0000000195851224 0x19584c000 + 21028
    2   libsystem_c.dylib               0x000000019572ab14 0x1956c8000 + 404244
    3   libc++abi.dylib                 0x00000001947fd414 0x1947fc000 + 5140
    4   libc++abi.dylib                 0x000000019481cb88 0x1947fc000 + 134024
    5   libobjc.A.dylib                 0x000000019502c3bc 0x195024000 + 33724
    6   libc++abi.dylib                 0x0000000194819bb0 0x1947fc000 + 121776
    7   libc++abi.dylib                 0x0000000194819474 0x1947fc000 + 119924
    8   libobjc.A.dylib                 0x000000019502c200 0x195024000 + 33280
    9   CoreFoundation                  0x00000001848ce21c 0x1847a8000 + 1204764
    10  TouchPalDialer                  0x000000010052e2c4 0x100028000 + 5268164
    11  TouchPalDialer                  0x000000010052e038 0x100028000 + 5267512
    12  libsystem_platform.dylib        0x0000000195848948 0x195844000 + 18760
    13  TouchPalDialer                  0x00000001009106b4 0x100028000 + 9340596
    14  TouchPalDialer                  0x00000001009106b4 0x100028000 + 9340596
    15  TouchPalDialer                  0x0000000100918024 0x100028000 + 9371684
    16  TouchPalDialer                  0x00000001009cd354 0x100028000 + 10113876
    17  TouchPalDialer                  0x00000001009ce940 0x100028000 + 10119488
    18  TouchPalDialer                  0x0000000100909a08 0x100028000 + 9312776
    19  TouchPalDialer                  0x00000001009cf698 0x100028000 + 10122904
    20  libsystem_pthread.dylib         0x000000019584fe7c 0x19584c000 + 15996
    21  libsystem_pthread.dylib         0x000000019584fdd8 0x19584c000 + 15832
    22  libsystem_pthread.dylib         0x000000019584cfac 0x19584c000 + 4012
    

    这里的内存地址是指程序运行时的内存地址(区别于程序编译之后的内存地址

    符号是指人类可读的代码信息,一般包括文件名、类型、函数名、行数

    比如以下是一行解析后的符号信息:

    1 -[ContactEditNoteView saveNote] (in TouchPalDialer) (ContactEditNoteView.m:98)
    

    收集crash

    crash的源头

    uncaught exception导致程序终止;程序被终止前,exception能被uncaught exception hangler处理。

    iOS Developer Library: Uncaught Exceptions

    If an exception is not caught, it is intercepted by a function called the uncaught exception handler. The uncaught exception handler always causes the program to exit but may perform some task before this happens.

    uncaught exception的来源:

    1. 内核
    2. 其他进程
    3. 本身的进程

    Handling unhandled exceptions and signals

    An unhandled signal can come from three places: the kernel, other processes or the application itself. The two most common signals that cause crashes are:


    EXC_BAD_ACCESS is a Mach exception sent by the kernel to your application when you try to access memory that is not mapped for your application. If not handled at the Mach level, it will be translated into a SIGBUS or SIGSEGV BSD signal.
    SIGABRT is a BSD signal sent by an application to itself when an NSException or obj_exception_throw is not caught.

    Mac OS X内核架构如下图所示。mach的exception可能会通过BSD被转换成UNIX类似的signal。

     
    Paste_Image.png
     
    Paste_Image.png

    捕获crash

    1. 如果被转成了NSException,可以通过NSSetUncaughtExecptionHandler()捕获;

    2. 如果以unix signal的形式发送给相应的线程,则可以通过C的函数注册对应的信号函数来处理 signal(int sig, sig_t func)

    获取crash的具体信息

    1. [NSException callStackSymbols];

    2. int backtrace(void** array, int size);
      char** backtrace_symbols(void* const* array, int size);

    对比

    捕获crash的入口API获取crash具体信息说明
    NSExecption NSSetUncaughtExecptionHandler() [NSException callStackSymbols]  
    signal signal(int sig, sig_t func) int backtrace(void** array, int size);
    char** backtrace_symbols(void* const* array, int size);
     

    收集crash的步骤

    1. 注册 UncaughtExecptionHandlersignal(int sig, sig_t func)

    2. 通过对应方法获取 函数调用栈的符号: [NSException callStackSymbols] 或者 backtrace_symbols(void* const* array, int size)

    3. 保存成文件,并上传到服务器

    4. 根据调用栈信息和符号表文件(.dSYM文件)进行符号解析。通常使用的命令是:atos。比如 atos -o ./TouchPalDialer.app/TouchPalDialer -arch arm64 -s 0x2760 0x00000001004ed148

    收集到的crash实例

    以下是实际代码中收集的crash信息,来自于文件ios_crash.plist

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
    <dict>
        <key>abstract</key>
        <string>UncaughtSignalException: Signal 10 was raised.</string>
        <key>app_name</key>
        <string>com.cootek.Contacts</string>
        <key>app_version</key>
        <string>5384</string>
        <key>detail</key>
        <string>0   TouchPalDialer                      0x00000001005e533c _ZNSbItSt11char_traitsItESaItEE7reserveEm + 378016 |
    1   TouchPalDialer                      0x00000001005e4fd4 _ZNSbItSt11char_traitsItESaItEE7reserveEm + 377144 |
    2   libsystem_platform.dylib            0x0000000197b4094c _sigtramp + 52 |
    3   TouchPalDialer                      0x0000000100a46624 _ZNSt8_Rb_treeISbItSt11char_traitsItESaItEESt4pairIKS3_St6vectorIiSaIiEEESt10_Select1stIS9_ESt4lessIS3_ESaIS9_EE4findERS5_ + 3160 |
    4   TouchPalDialer                      0x0000000100a46624 _ZNSt8_Rb_treeISbItSt11char_traitsItESaItEESt4pairIKS3_St6vectorIiSaIiEEESt10_Select1stIS9_ESt4lessIS3_ESaIS9_EE4findERS5_ + 3160 |
    5   TouchPalDialer                      0x0000000100a462e4 _ZNSt8_Rb_treeISbItSt11char_traitsItESaItEESt4pairIKS3_St6vectorIiSaIiEEESt10_Select1stIS9_ESt4lessIS3_ESaIS9_EE4findERS5_ + 2328 |
    6   TouchPalDialer                      0x0000000100a4bc20 _ZNSt8_Rb_treeIjSt4pairIKjN7orlando7VipInfoEESt10_Select1stIS4_ESt4lessIjESaIS4_EE4findERS1_ + 632 |
    7   TouchPalDialer                      0x00000001005416c0 _ZNSt6vectorISsSaISsEE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPSsS1_EERKSs + 666676 |
    8   TouchPalDialer                      0x0000000100540914 _ZNSt6vectorISsSaISsEE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPSsS1_EERKSs + 663176 |
    9   libdispatch.dylib                   0x00000001979693ac <redacted> + 24 |
    10  libdispatch.dylib                   0x000000019796936c <redacted> + 16 |
    11  libdispatch.dylib                   0x00000001979734c0 <redacted> + 1216 |
    12  libdispatch.dylib                   0x000000019796c474 <redacted> + 132 |
    13  libdispatch.dylib                   0x0000000197975224 <redacted> + 664 |
    14  libdispatch.dylib                   0x000000019797675c <redacted> + 108 |
    15  libsystem_pthread.dylib             0x0000000197b452e4 _pthread_wqthread + 816 |
    16  libsystem_pthread.dylib             0x0000000197b44fa8 start_wqthread + 4</string>
        <key>device</key>
        <string>iPhone7,1</string>
        <key>manufacturer</key>
        <string>Apple</string>
        <key>os_name</key>
        <string>iOS</string>
        <key>os_version</key>
        <string>iOS 8.1.2</string>
        <key>slide</key>
        <integer>933888</integer>
        <key>timestamp</key>
        <string>1456103577</string>
    </dict>
    </plist>
    
    

    工具: atos

    关键:load address, slide

    atos -- convert numeric addresses to symbols of binary images or processes
    
    atos [-o <binary-image-file>] [-p <pid> | <partial-executable-name>] [-arch architecture]
              [-l <load-address>] [-s <slide>] [-printHeader] [-f <address-input-file>]
              [<address> ...]
            
    

    使用atos使用举例:

    atos -o ./TouchPalDialer.app/TouchPalDialer -arch arm64 -s 0x2760 0x00000001004ed148
    

    注意:

    命令atos中输入的解析地址要求是构建的内存地址(built address)(因为这个地址是要对应于dSYM文件的,而dSYM文件是在构建产生的),而获取并上传的函数调用栈的地址是程序在运行时的内存地址,称之为实际加载地址

     
    Paste_Image.png

    苹果开发者文档(Technical Note TN2123)指出,需要区分两个加载地址(load address):实际加载地址 期望加载地址

    1. 实际加载地址 (actual load address)
      是指程序运行时的地址。每次程序装载(load)都可能不同。

    2. 期望加载地址 (intented load address)
      是指编译之后指定的加载地址。

    偏移量 = 实际加载地址 - 期望加载地址

    slide = acutal load address - intended load addrss

    获取load address,slide

    • 加载地址(load address)
      如果能够获取有系统的CrashReporter产生的完成的崩溃日志文件(.crash文件),则从其中的Binary Images部分获取当前程序的**实际加载地址(acutal load address)**

    举例如下:

    Binary Images:
    0x100028000 - 0x100c53fff TouchPalDialer arm64  <a197140a05563a0c983ef71bb8a83e1b> /var/mobile/Containers/Bundle/Application/C5B024A9-A8CC-4F1D-8613-99376B830C3E/TouchPalDialer.app/TouchPalDialer
    0x1200c0000 - 0x1200e7fff dyld arm64  <36eff49275c23d2d815e48af33eea471> /usr/lib/dyld
    0x182e60000 - 0x182e7dfff libJapaneseConverter.dylib arm64  <39642fdaade73029adb01e10922d2ba3> /System/Library/CoreServices/Encodings/libJapaneseConverter.dylib
    
    • 偏移量(slide)
      调用底层C的API获取,_dyld_get_image_vmaddr_slide(uint32_t image_index)

    举例如下:

    + (long) getImageSlide {
        long slide = -1;
        for (uint32_t i = 0; i < _dyld_image_count(); i++) {
            if (_dyld_get_image_header(i)->filetype == MH_EXECUTE) {
                slide = _dyld_get_image_vmaddr_slide(i);
                break;
            }
        }
        return slide;
    }
    

    参考资料



    作者:game3108
    链接:http://www.jianshu.com/p/830576bde445
    來源:简书
    著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处。
  • 相关阅读:
    [小技巧]虚拟机服务管理小程序
    JNI学习
    Java读取Properties文件的七种方法
    UFLDL教程练习(exercise)答案(1)
    win7让库显示“我的电脑”
    关于asp.net中绑定的模版列CheckBox无法触发OnCheckedChanged事件的问题
    使用OLEDB读取不同版本Excel数据的连接字符串设置
    身为程序员,电脑的时间格式是不能随意设置的
    实现sqlserver数据根据不同时间周期分组
    常用Web Service汇总(天气预报、时刻表等)【转】
  • 原文地址:https://www.cnblogs.com/feng9exe/p/7978201.html
Copyright © 2011-2022 走看看