在Swift 3中，如果想打印线程的调用栈，可以简单的使用Thread.callStackSymbols，如下代码所示：

for symbol in Thread.callStackSymbols {
    print(symbol)
}

// 0   ???                                 0x00000001198270a1 0x0 + 4722946209
// 1   MyPlayground                        0x0000000106051730 main + 0
// 2   CoreFoundation                      0x000000010989620c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
// 3   CoreFoundation                      0x000000010987aa3b __CFRunLoopDoBlocks + 203
// 4   CoreFoundation                      0x000000010987a214 __CFRunLoopRun + 1300
// 5   CoreFoundation                      0x0000000109879a89 CFRunLoopRunSpecific + 409
// 6   GraphicsServices                    0x000000010d5e79c6 GSEventRunModal + 62
// 7   UIKit                               0x0000000106af5d30 UIApplicationMain + 159
// 8   MyPlayground                        0x00000001060517f9 main + 201
// 9   libdyld.dylib                       0x00000001062e5d81 start + 1
// 10  ???                                 0x0000000000000001 0x0 + 1

如果想使用C函数backtrace，需要在bridging header file中导入execinfo.h头文件，然后如理代码所示，记得最后需要用free释放symbols。

var callstack = [UnsafeMutableRawPointer?](repeating: nil, count: 128)
let frames = backtrace(&callstack, Int32(callstack.count))
if let symbols = backtrace_symbols(&callstack, frames) {
    for frame in 0..<Int(frames) where symbols[frame] != nil {
        let symbol = String(cString: symbols[frame]!)
        print(symbol)
    }
    free(symbols)
}

参考

  1. how to call backtrace_symbols() in swift