[SR-15813] Can't demangle: $s6CursesAAC0A5ErrorO7failure33_61E0A6C766720A31D17A693014794242LLXeF8functionL_SSvp

[swift-ci]

Previous ID	SR-15813
Radar	None
Original Reporter	solomonu (JIRA User)
Type	Bug

Attachment: Download

Environment

Running on replit.com. I have attached a dump of the project, including source code and configuration files. You should also be able to reproduce this at https://replit.com/@solly_ucko/Swift-NCurses-copy-for-Swift-demangler-bug-report.

> swift --version
Swift version 5.4.2 (swift-5.4.2-RELEASE)
Target: x86_64-unknown-linux-gnu
> uname -a
Linux 3e5f939fdf4c 5.11.0-1029-gcp #33~20.04.3-Ubuntu SMP Tue Jan 18 12:03:29 UTC 2022 x86_64 GNU/Linux

I am new to Swift, but I have experience with languages such as Python, Rust, C, and C++, and with concepts such as linking and name mangling and demangling.

Additional Detail from JIRA

Votes	0
Component/s	Compiler, swift
Labels	Bug, CompilerCrash, Linux
Assignee	None
Priority	Medium

md5: d83118b99e4e2766330a9ce4ce109155

Issue Description:

> swift run
/home/runner/Swift-NCurses: warning: /nix/store/v8imx1nvyz0hgvx9cbcmh6gp4ngw3ffj-binutils-2.35.1/bin/ld.gold: warning: /nix/store/9bh3986bpragfjmr32gay8p95k91q4gy-glibc-2.33-47/lib/../lib64/Scrt1.o: unknown program property type 0xc0008002 in .note.gnu.property section
/home/runner/Swift-NCurses/Sources/Curses/Curses.swift:21:30: error: expected type
public enum CursesError: {
^
/home/runner/Swift-NCurses/Sources/Curses/Curses.swift:3:8: error: no such module 'OrderedCollections'
import OrderedCollections
^
Can't demangle: $s6CursesAAC0A5ErrorO7failure33_61E0A6C766720A31D17A693014794242LLXeF8functionL_SSvp
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace.
Stack dump:
0. Program arguments: /nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend -frontend -c -primary-file /home/runner/Swift-NCurses/Sources/Curses/Curses.swift /home/runner/Swift-NCurses/Sources/Curses/Window.swift /home/runner/Swift-NCurses/Sources/Curses/WindowOwned.swift -emit-module-path /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/Curses.build/Curses~partial.swiftmodule -emit-module-doc-path /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/Curses.build/Curses~partial.swiftdoc -emit-module-source-info-path /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/Curses.build/Curses~partial.swiftsourceinfo -emit-dependencies-path /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/Curses.build/Curses.d -emit-reference-dependencies-path /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/Curses.build/Curses.swiftdeps -target x86_64-unknown-linux-gnu -disable-objc-interop -I /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug -color-diagnostics -enable-testing -g -module-cache-path /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/ModuleCache -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -enable-anonymous-context-mangled-names -Xcc -fmodule-map-file=/home/runner/Swift-NCurses/Sources/ncurses/module.modulemap -parse-as-library -module-name Curses -o /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/Curses.build/Curses.swift.o -index-store-path /home/runner/Swift-NCurses/.build/x86_64-unknown-linux-gnu/debug/index/store -index-system-modules
1. Swift version 5.4.2 (swift-5.4.2-RELEASE)
2. While walking into decl 'Curses' (at /home/runner/Swift-NCurses/Sources/Curses/Curses.swift:5:8)
3. While evaluating request USRGenerationRequest(Curses.(file).Curses.CursesError.failure(function:returnValue:arguments:).function@/home/runner/Swift-NCurses/Sources/Curses/Curses.swift:24:22)
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x55ece04]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x55eab8e]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x55ecfe0]
/nix/store/9bh3986bpragfjmr32gay8p95k91q4gy-glibc-2.33-47/lib/libpthread.so.0(+0x12ef0)[0x7f506bbfbef0]
/nix/store/9bh3986bpragfjmr32gay8p95k91q4gy-glibc-2.33-47/lib/libc.so.6(gsignal+0xca)[0x7f506b85abaa]
/nix/store/9bh3986bpragfjmr32gay8p95k91q4gy-glibc-2.33-47/lib/libc.so.6(abort+0xff)[0x7f506b845523]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1b8f322]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x18fc19d]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1b7bcea]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x14e9b6c]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1b7d834]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1b7d371]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1b7c5fc]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1b7c577]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6e84a3]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6e7ae8]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6e5aae]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6cdc12]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x192c396]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1930787]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x192c3c4]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1931496]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x192c3c4]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1931496]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x192c3c4]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x192c2e3]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x1adae29]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6cb9ff]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6e5250]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6e50f4]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6dd18b]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x6dcc43]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x4ccdb9]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x4c4c2c]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x4c099b]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x44a3c6]
/nix/store/9bh3986bpragfjmr32gay8p95k91q4gy-glibc-2.33-47/lib/libc.so.6(__libc_start_main+0xd0)[0x7f506b846780]
/nix/store/ffiri8mgh23717kddj8lap2jz7d2n2qy-swift-5.4.2/bin/swift-frontend[0x449eca]
error: fatalError
exit status 1

[swift-ci]

Comment by Solomon Ucko (JIRA)

Based on https://github.com/apple/swift/blob/7123d2614b5f222d03b3762cb110d27a9dd98e24/docs/ABI/Mangling.rst, here is my guess for the mangled name is supposed to be parsed:

• $s: prefix

• 6Curses: Curses

• AA: substitution 0, AKA Curses

• C: class

• 0: "identifier with word substitutions"

• A: "last word substitution in identifier" 0

• 5Error: Error

• O: enum

• 7failure: failure

• 33_: index 32?

• 61E0A6C766720A31D17A693014794242: 32 bytes encoded as hex?

• LL: "file-discriminated declaration"

• Xe: "error or unresolved type"

• F: function

• 8function: function

• L_SSvp: not sure, too many possibilities depending on context

Based on the output, it seems like the original name is Curses.CursesError.failure(function:returnValue:arguments🙂, which matches with the identifiers in the mangled name.