在“NotFound”消息中使用 lldb 和 cppvsdbg 进行 VSCode Rust 调试

【问题标题】：VSCode Rust debugging with lldb and cppvsdbg panics at "NotFound" message在“NotFound”消息中使用 lldb 和 cppvsdbg 进行 VSCode Rust 调试
【发布时间】：2021-06-24 12:50:49
【问题描述】：

尝试使用 lldb 和 cppvsdbg 调试我用 rust 编写的程序，并在执行一个函数后，该函数应该返回 Result(Protocol, Value) 或 Box 会引发这种恐慌：

线程 'main' 在 Err 上的 Result::unwrap() 上出现恐慌值：Os { 代码：3，种类：NotFound，消息：“系统找不到指定的路径。” }', replay_parser\src\lib.rs:167:55

即它找不到某些文件。

不确定它指的是什么文件，但这里有一个完整的回溯：

来自 lldb：

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 3, kind: NotFound, message: "The system cannot find the path specified." }', replay_parser\src\lib.rs:167:55
stack backtrace:
   0:     0x7ff78321d28e - std::backtrace_rs::backtrace::dbghelp::trace
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\..\..\backtrace\src\backtrace\dbghelp.rs:98
   1:     0x7ff78321d28e - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66    
   2:     0x7ff78321d28e - std::sys_common::backtrace::_print_fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:67
   3:     0x7ff78321d28e - std::sys_common::backtrace::_print::{{impl}}::fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:46
   4:     0x7ff78323422b - core::fmt::write
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\fmt\mod.rs:1078
   5:     0x7ff783218ab8 - std::io::Write::write_fmt<std::sys::windows::stdio::Stderr>
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\io\mod.rs:1517
   6:     0x7ff78321ffcd - std::sys_common::backtrace::_print
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:49
   7:     0x7ff78321ffcd - std::sys_common::backtrace::print
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:36
   8:     0x7ff78321ffcd - std::panicking::default_hook::{{closure}}
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:208
   9:     0x7ff78321fa34 - std::panicking::default_hook
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:225
  10:     0x7ff7832208de - std::panicking::rust_panic_with_hook
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:591
  11:     0x7ff783220401 - std::panicking::begin_panic_handler::{{closure}}
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:497
  12:     0x7ff78321dbef - std::sys_common::backtrace::__rust_end_short_backtrace<closure-0,!>
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:141
  13:     0x7ff783220359 - std::panicking::begin_panic_handler
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:493
  14:     0x7ff783233550 - core::panicking::panic_fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\panicking.rs:92
  15:     0x7ff783233373 - core::option::expect_none_failed
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\option.rs:1268
  16:     0x7ff782fd55e2 - core::result::Result<mpq::archive::Archive, std::io::error::Error>::unwrap<mpq::archive::Archive,std::io::error::Error>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\result.rs:973
  17:     0x7ff782fd4600 - replay_parser::parse_replay
                               at D:\Projects\SC2Emul\SC2Emulator\replay_parser\src\lib.rs:167
  18:     0x7ff782fd14d8 - sc2_emulator::main
                               at D:\Projects\SC2Emul\SC2Emulator\sc2emul\src\main.rs:31
  19:     0x7ff782fd174b - core::ops::function::FnOnce::call_once<fn() -> core::result::Result<tuple<>, log::SetLoggerError>,tuple<>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:227
  20:     0x7ff782fd154b - std::sys_common::backtrace::__rust_begin_short_backtrace<fn() -> core::result::Result<tuple<>, log::SetLoggerError>,core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\sys_common\backtrace.rs:125
  21:     0x7ff782fd17f1 - std::rt::lang_start::{{closure}}<core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\rt.rs:66
  22:     0x7ff783220a94 - core::ops::function::impls::{{impl}}::call_once
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\library\core\src\ops\function.rs:280
  23:     0x7ff783220a94 - std::panicking::try::do_call
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:379
  24:     0x7ff783220a94 - std::panicking::try
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:343
  25:     0x7ff783220a94 - std::panic::catch_unwind
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panic.rs:396
  26:     0x7ff783220a94 - std::rt::lang_start_internal
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\rt.rs:51
  27:     0x7ff782fd17c3 - std::rt::lang_start<core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\rt.rs:65
  28:     0x7ff782fd1510 - main
  29:     0x7ff78325abbc - invoke_main
                               at d:\A01\_work\12\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  30:     0x7ff78325abbc - __scrt_common_main_seh
                               at d:\A01\_work\12\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
  31:     0x7ffed1de7034 - BaseThreadInitThunk
  32:     0x7ffed1f82651 - RtlUserThreadStart

来自 cppvsdbg：

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 3, kind: NotFound, message: "The system cannot find the path specified." }', replay_parser\src\lib.rs:167:55
stack backtrace:
   0:     0x7ff78321d28e - std::backtrace_rs::backtrace::dbghelp::trace
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\..\..\backtrace\src\backtrace\dbghelp.rs:98
   1:     0x7ff78321d28e - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66    
   2:     0x7ff78321d28e - std::sys_common::backtrace::_print_fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:67
   3:     0x7ff78321d28e - std::sys_common::backtrace::_print::{{impl}}::fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:46
   4:     0x7ff78323422b - core::fmt::write
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\fmt\mod.rs:1078
   5:     0x7ff783218ab8 - std::io::Write::write_fmt<std::sys::windows::stdio::Stderr>
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\io\mod.rs:1517
   6:     0x7ff78321ffcd - std::sys_common::backtrace::_print
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:49
   7:     0x7ff78321ffcd - std::sys_common::backtrace::print
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:36
   8:     0x7ff78321ffcd - std::panicking::default_hook::{{closure}}
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:208
   9:     0x7ff78321fa34 - std::panicking::default_hook
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:225
  10:     0x7ff7832208de - std::panicking::rust_panic_with_hook
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:591
  11:     0x7ff783220401 - std::panicking::begin_panic_handler::{{closure}}
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:497
  12:     0x7ff78321dbef - std::sys_common::backtrace::__rust_end_short_backtrace<closure-0,!>
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:141
  13:     0x7ff783220359 - std::panicking::begin_panic_handler
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:493
  14:     0x7ff783233550 - core::panicking::panic_fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\panicking.rs:92
  15:     0x7ff783233373 - core::option::expect_none_failed
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\option.rs:1268
  16:     0x7ff782fd55e2 - core::result::Result<mpq::archive::Archive, std::io::error::Error>::unwrap<mpq::archive::Archive,std::io::error::Error>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\result.rs:973
  17:     0x7ff782fd4600 - replay_parser::parse_replay
                               at D:\Projects\SC2Emul\SC2Emulator\replay_parser\src\lib.rs:167
  18:     0x7ff782fd14d8 - sc2_emulator::main
                               at D:\Projects\SC2Emul\SC2Emulator\sc2emul\src\main.rs:31
  19:     0x7ff782fd174b - core::ops::function::FnOnce::call_once<fn() -> core::result::Result<tuple<>, log::SetLoggerError>,tuple<>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:227
  20:     0x7ff782fd154b - std::sys_common::backtrace::__rust_begin_short_backtrace<fn() -> core::result::Result<tuple<>, log::SetLoggerError>,core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\sys_common\backtrace.rs:125
  21:     0x7ff782fd17f1 - std::rt::lang_start::{{closure}}<core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\rt.rs:66
  22:     0x7ff783220a94 - core::ops::function::impls::{{impl}}::call_once
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\library\core\src\ops\function.rs:280
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 3, kind: NotFound, message: "The system cannot find the path specified." }', replay_parser\src\lib.rs:167:55
stack backtrace:
   0:     0x7ff78321d28e - std::backtrace_rs::backtrace::dbghelp::trace
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\..\..\backtrace\src\backtrace\dbghelp.rs:98
   1:     0x7ff78321d28e - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66    
   2:     0x7ff78321d28e - std::sys_common::backtrace::_print_fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:67
   3:     0x7ff78321d28e - std::sys_common::backtrace::_print::{{impl}}::fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:46
   4:     0x7ff78323422b - core::fmt::write
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\fmt\mod.rs:1078
   5:     0x7ff783218ab8 - std::io::Write::write_fmt<std::sys::windows::stdio::Stderr>
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\io\mod.rs:1517
   6:     0x7ff78321ffcd - std::sys_common::backtrace::_print
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:49
   7:     0x7ff78321ffcd - std::sys_common::backtrace::print
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:36
   8:     0x7ff78321ffcd - std::panicking::default_hook::{{closure}}
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:208
   9:     0x7ff78321fa34 - std::panicking::default_hook
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:225
  10:     0x7ff7832208de - std::panicking::rust_panic_with_hook
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:591
  11:     0x7ff783220401 - std::panicking::begin_panic_handler::{{closure}}
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:497
  12:     0x7ff78321dbef - std::sys_common::backtrace::__rust_end_short_backtrace<closure-0,!>
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\sys_common\backtrace.rs:141
  13:     0x7ff783220359 - std::panicking::begin_panic_handler
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:493
  14:     0x7ff783233550 - core::panicking::panic_fmt
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\panicking.rs:92
  15:     0x7ff783233373 - core::option::expect_none_failed
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\core\src\option.rs:1268
  16:     0x7ff782fd55e2 - core::result::Result<mpq::archive::Archive, std::io::error::Error>::unwrap<mpq::archive::Archive,std::io::error::Error>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\result.rs:973
  17:     0x7ff782fd4600 - replay_parser::parse_replay
                               at D:\Projects\SC2Emul\SC2Emulator\replay_parser\src\lib.rs:167
  18:     0x7ff782fd14d8 - sc2_emulator::main
                               at D:\Projects\SC2Emul\SC2Emulator\sc2emul\src\main.rs:31
  19:     0x7ff782fd174b - core::ops::function::FnOnce::call_once<fn() -> core::result::Result<tuple<>, log::SetLoggerError>,tuple<>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:227
  20:     0x7ff782fd154b - std::sys_common::backtrace::__rust_begin_short_backtrace<fn() -> core::result::Result<tuple<>, log::SetLoggerError>,core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\sys_common\backtrace.rs:125
  21:     0x7ff782fd17f1 - std::rt::lang_start::{{closure}}<core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\rt.rs:66
  22:     0x7ff783220a94 - core::ops::function::impls::{{impl}}::call_once
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\library\core\src\ops\function.rs:280
  23:     0x7ff783220a94 - std::panicking::try::do_call
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:379
  24:     0x7ff783220a94 - std::panicking::try
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panicking.rs:343
  25:     0x7ff783220a94 - std::panic::catch_unwind
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\panic.rs:396
  26:     0x7ff783220a94 - std::rt::lang_start_internal
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b\/library\std\src\rt.rs:51
  27:     0x7ff782fd17c3 - std::rt::lang_start<core::result::Result<tuple<>, log::SetLoggerError>>
                               at C:\Users\Xeizzeth\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\rt.rs:65
  28:     0x7ff782fd1510 - main
  29:     0x7ff78325abbc - invoke_main
                               at d:\A01\_work\12\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  30:     0x7ff78325abbc - __scrt_common_main_seh
                               at d:\A01\_work\12\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
  31:     0x7ffed1de7034 - BaseThreadInitThunk
  32:     0x7ffed1f82651 - RtlUserThreadStart

感谢任何帮助。

【问题讨论】：

  • 只有在调试过程中才会出现这种情况吗？在任何情况下，您的代码中都会产生恐慌： 17: replay_parser::parse_replay at D:\Projects\SC2Emul\SC2Emulator\replay_parser\src\lib.rs:167
  • 是的，它只发生在调试期间。程序本身编译运行良好。
  • 好吧，我会看到那一行。我记得它对 .unwrap() 大喊大叫，确实在那条线上有一个 unwrap。
  • 如果没有minimal reproducible example，很难说出了什么问题。
  • 我让它工作了。它无法通过相对路径找到重播存档，所以我必须提供绝对路径。谢谢你的帮助@HHK 很有帮助。

标签： debugging rust lldb vscode-debugger codelldb


【解决方案1】：

问题是它找不到指定的重播存档。我给它提供了相对路径，在调试过程中它无法通过相对路径找到它，所以我必须提供绝对路径。

【讨论】：

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