Debugger stops for an unknown reason (Swift - iOS application)

[wojciech-kulik]

I'm using codelldb to debug iOS applicatons (with the help of my plugin xcodebuild.nvim).

However, in one of my projects, every time I start the app for debugging, it is stopped for some unknown reason and I have to run "continue". The same happens when I try debugging tests. This is what I get:

; Symbol: __cxa_throw, mangled name=__cxa_throw
; Source: unknown
180290AB0: F8 5F BC A9                stp    x24, x23, [sp, #-0x40]!
180290AB4: F6 57 01 A9                stp    x22, x21, [sp, #0x10]
180290AB8: F4 4F 02 A9                stp    x20, x19, [sp, #0x20]
180290ABC: FD 7B 03 A9                stp    x29, x30, [sp, #0x30]
180290AC0: FD C3 00 91                add    x29, sp, #0x30
180290AC4: F3 03 02 AA                mov    x19, x2
180290AC8: F4 03 01 AA                mov    x20, x1
180290ACC: F5 03 00 AA                mov    x21, x0
180290AD0: 1D F5 FF 97                bl     0x18028df44  ; __cxa_get_globals
180290AD4: F6 03 00 AA                mov    x22, x0
180290AD8: 79 F5 FF 97                bl     0x18028e0bc  ; std::get_unexpected()
180290ADC: A0 02 1A F8                stur   x0, [x21, #-0x60]
180290AE0: 95 F5 FF 97                bl     0x18028e134  ; std::get_terminate()
180290AE4: 08 60 85 D2                mov    x8, #0x2b00
180290AE8: 68 65 A8 F2                movk   x8, #0x432b, lsl #16
180290AEC: E8 C8 C9 F2                movk   x8, #0x4e47, lsl #32
180290AF0: 88 69 E8 F2                movk   x8, #0x434c, lsl #48
180290AF4: A8 0E 1E F8                str    x8, [x21, #-0x20]!
180290AF8: B7 82 01 D1                sub    x23, x21, #0x60
180290AFC: A0 82 1C F8                stur   x0, [x21, #-0x38]
180290B00: B4 4E 3B A9                stp    x20, x19, [x21, #-0x50]
180290B04: 28 00 80 52                mov    w8, #0x1
180290B08: A8 82 1A F8                stur   x8, [x21, #-0x58]
180290B0C: C8 0A 40 B9                ldr    w8, [x22, #0x8]
180290B10: 08 05 00 11                add    w8, w8, #0x1
180290B14: C8 0A 00 B9                str    w8, [x22, #0x8]
180290B18: 08 00 00 90                adrp   x8, 0
180290B1C: 08 D1 2C 91                add    x8, x8, #0xb34  ; __cxxabiv1::exception_cleanup_func(_Unwind_Reason_Code, _Unwind_Exception*)
180290B20: A8 06 00 F9                str    x8, [x21, #0x8]
180290B24: E0 03 15 AA                mov    x0, x21
180290B28: 20 04 00 94                bl     0x180291ba8  ; symbol stub for: _Unwind_RaiseException
180290B2C: E0 03 17 AA                mov    x0, x23
180290B30: 09 00 00 94                bl     0x180290b54  ; __cxxabiv1::failed_throw(__cxxabiv1::__cxa_exception*)

I discovered that I can reproduce it every time while running debugger for this test:

final class SampleTest: XCTestCase {
    func testSample() {
        let label = UILabel()
        XCTAssertEqual(1, 1)
    }
}

It looks like the creation of UILabel is causing the problem.

If I run the project in Xcode, the debugger doesn't stop.

Any idea how to diagnose the problem?