Test of backtrace and dladdr with C++ lambdas

dladdr-lambda-test.mm

// c++ -framework Foundation -std=c++14 -o dladdr-lambda-test dladdr-lambda-test.mm

#import <Foundation/Foundation.h>
#include <cxxabi.h>
#include <dlfcn.h>
#include <execinfo.h>

@interface MyObject : NSObject
@end

@implementation MyObject

+ (void)doStuff
{
    [] {
        void* callstack[128];
        int i, frames = backtrace(callstack, 128);
        for (i = 0; i < frames; ++i) {
            if ((intptr_t)callstack[i] == 1)
                continue;

            const char* mangledName;
            const char* demangledName;
            Dl_info info;
            if (dladdr(callstack[i], &info) && info.dli_sname)
                mangledName = info.dli_sname;
            if (mangledName)
                demangledName = abi::__cxa_demangle(mangledName, nullptr, nullptr, nullptr);
            if (mangledName || demangledName)
                printf("0x%016lx %s + %ld\n", (intptr_t)callstack[i], demangledName ? demangledName : mangledName, (intptr_t)callstack[i] - (intptr_t)info.dli_saddr);
            else
                printf("?\n");
        }
    }();
}

@end

int main(int argc, char** argv)
{
    [MyObject doStuff];
}