ios - EXC_BAD_ACCESS 自动处理

Question

我正在尝试为 iOS 构建自己的信号和未捕获异常处理程序。为此，我使用了这两个函数:

NSSetUncaughtExceptionHandler(/*handler*/); 

和

signal(/*signal const*/, /*signal handler*/);

我的问题是我无法让它与 EXC_BAD_ACCESS 信号一起工作。是否有一些信号常量(如 SIGABRT、SIGBUS)来捕获 EXC_BAD_ACCESS？如果没有，我该如何处理？一些崩溃分析工具(例如 PLCrashReporter、Crashlytics 等)可以跟踪它...

Answer 1

EXC_BAD_ACCESS 不会生成异常，因此您的第一个函数不适用于这种情况。它生成信号 SIGSEGV 或 SIGBUS。

请引用Handling unhandled exceptions and signals作者 Cocoa with Love。

更新

刚刚查看了LLDB的源码。它可能是 TARGET_EXC_BAD_ACCESS = 0x91。

在 RNBRemote.h 中:

/* We translate the /usr/include/mach/exception_types.h exception types
   (e.g. EXC_BAD_ACCESS) to the fake BSD signal numbers that gdb uses
   in include/gdb/signals.h (e.g. TARGET_EXC_BAD_ACCESS).  These hard
   coded values for TARGET_EXC_BAD_ACCESS et al must match the gdb
   values in its include/gdb/signals.h.  */

#define TARGET_EXC_BAD_ACCESS      0x91
#define TARGET_EXC_BAD_INSTRUCTION 0x92
#define TARGET_EXC_ARITHMETIC      0x93
#define TARGET_EXC_EMULATION       0x94
#define TARGET_EXC_SOFTWARE        0x95
#define TARGET_EXC_BREAKPOINT      0x96

在 RNBRemote.cpp 中:

// Translate any mach exceptions to gdb versions, unless they are
// common exceptions like a breakpoint or a soft signal.
switch (tid_stop_info.details.exception.type)
{
    default:                    signum = 0; break;
    case EXC_BREAKPOINT:        signum = SIGTRAP; break;
    case EXC_BAD_ACCESS:        signum = TARGET_EXC_BAD_ACCESS; break;
    case EXC_BAD_INSTRUCTION:   signum = TARGET_EXC_BAD_INSTRUCTION; break;
    case EXC_ARITHMETIC:        signum = TARGET_EXC_ARITHMETIC; break;
    case EXC_EMULATION:         signum = TARGET_EXC_EMULATION; break;
    case EXC_SOFTWARE:
        if (tid_stop_info.details.exception.data_count == 2 &&
            tid_stop_info.details.exception.data[0] == EXC_SOFT_SIGNAL)
            signum = tid_stop_info.details.exception.data[1];
        else
            signum = TARGET_EXC_SOFTWARE;
        break;
}