Symbolication: Beyond the basics

1:11 - MagicNumbers

func selectMagicNumber(choices: [Int]) -> Int {
    return choices[MAGIC_CHOICE]
}

func randomValue() -> Int {
    return Int.random(in: 1...100)
}

func numberChoices() -> [Int] {
    var choices = [Int]()
    for _ in 1...10 {
        choices.append(randomValue())
    }
    return choices
}

func generateMagicNumber() -> Int {
    let numbers = numberChoices()
    let magic = selectMagicNumber(choices: numbers)
    return magic
}

print("The magic number is: \(generateMagicNumber())")

2:51 - atos symbolication

atos -o MagicNumbers.dSYM/Contents/Resources/DWARF/MagicNumbers -arch arm64 -l 0x10045c000 -i 0x10045fb70

7:34 - Load commands

otool -l MagicNumbers | grep LC_SEGMENT -A8

10:31 - Disassembly

otool -tV MagicNumbers -arch arm64

11:32 - vmmap

vmmap MagicNumbers | grep __TEXT

15:09 - Function starts

symbols -onlyFuncStartsData -arch arm64 MagicNumbers

17:06 - nlist_64

struct nlist_64 {
    union {
        uint32_t  n_strx;
    } n_un;
    uint8_t n_type;
    uint8_t n_sect;
    uint16_t n_desc;
    uint64_t n_value; 
};

17:59 - Direct symbols with nm

nm -arch arm64 —defined-only --numeric-sort MagicNumbers

18:30 - Demangled direct symbols with nm

nm -arch arm64 —defined-only --numeric-sort MagicNumbers | xcrun swift-demangle

18:43 - Demangled direct symbols with the symbols tool

symbols -arch arm64 -onlyNListData MagicNumbers

23:06 - Indirect symbols with nm

nm -m —arch arm64 --undefined-only --numeric-sort MagicNumbers

27:16 - Examining dSYMs with dwarfdump

dwarfdump -v -debug-info -arch arm64 MagicNumbers.dSYM

29:25 - atos symbolication without inlined functions

atos -o MagicNumbers.dSYM/Contents/Resources/DWARF/MagicNumbers -arch arm64 —l 0x10045c000 0x10045fb70

32:29 - Examining debugging symbols

dsymutil --dump-debug-map -arch arm64 MagicNumbers

33:59 - Examining dSYM UUIDs

symbols -uuid MagicNumbers.dSYM

34:03 - Verifying DWARF

dwarfdump —verify MagicNumbers.dSYM

35:09 - Verifying entitlements and codesigning

codesign --display -v  --entitlements :- MagicApp.app