最近気付いたんですが、self の再宣言で LLDB 壊れますね

class Example { func ok() { let f = { [weak self] in guard let strongSelf = self else { return } // Set a breakpoint at here print(strongSelf) } f() } func error() { let f = { [weak self] in guard let `self` = self else { return } // Set a breakpoint at here print(self) } f() } } Example().ok() Example().error()

6:16 AM

(lldb) br set --file example.swift --line 7 Breakpoint 1: where = example`closure #1 () -> () in example.Example.ok() -> () + 111 at example.swift:7, address = 0x00000001000017df (lldb) br set --file example.swift --line 18 Breakpoint 2: where = example`closure #1 () -> () in example.Example.error() -> () + 111 at example.swift:18, address = 0x00000001000019cf (lldb) r Process 6298 launched: '/Users/yuki.kokubun/Development/self-self-lldb/example' (x86_64) Process 6298 stopped * thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1 frame #0: 0x00000001000017df example`closure #1 in Example.ok(self=0x0000000100802b30) at example.swift:7 4 guard let strongSelf = self else { return } 5 6 // Set a breakpoint at here -> 7 print(strongSelf) 8 } 9 10 f() Target 0: (example) stopped. (lldb) po self ▿ Optional<Example> - some : <Example: 0x100802b30> (lldb) c Process 6298 resuming example.Example Process 6298 stopped * thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1 frame #0: 0x00000001000019cf example`closure #1 in Example.error(self=0x0000000100a01030) at example.swift:18 15 guard let `self` = self else { return } 16 17 // Set a breakpoint at here -> 18 print(self) 19 } 20 21 f() Target 0: (example) stopped. (lldb) po self error: warning: <EXPR>:12:9: warning: initialization of variable '$__lldb_error_result' was never used; consider replacing with assignment to '_' or removing it var $__lldb_error_result = __lldb_tmp_error ~~~~^~~~~~~~~~~~~~~~~~~~ _ error: <EXPR>:18:5: error: value of type 'Example' has no member '$__lldb_wrapped_expr_2' $__lldb_injected_self.$__lldb_wrapped_expr_2( ^~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~

6:17 AM

この場合、fr var は下のようになるので単純な名前ベースでの解決をしようとすると死ぬのが原因…？ (lldb) fr var (@lvalue example.Example?) self = 0x0000000100a01030 (example.Example) self = 0x0000000100a01030 {}