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[SR-11874] Struct with stored var of type () causes compiler crash #54289

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swift-ci opened this issue Nov 29, 2019 · 4 comments
Closed

[SR-11874] Struct with stored var of type () causes compiler crash #54289

swift-ci opened this issue Nov 29, 2019 · 4 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@swift-ci
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Previous ID SR-11874
Radar rdar://problem/57549596
Original Reporter broadway_lamb (JIRA User)
Type Bug
Status Resolved
Resolution Done
Environment

Apple Swift version 5.1.2 (swiftlang-1100.0.278 clang-1100.0.33.9)
Target: x86_64-apple-darwin19.0.0

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: 3638d75ee735abc684ef6333b0f14907

Issue Description:

struct S {
    var wat: ()
}

Attempt to compile this code causes segmentation fault. Replacing var with let OR replacing () with Void OR making the property computed makes the crash go away.

Stack dump:
0.  Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -primary-file /Users/sergej/Developer/CombineExploration/CombineExploration/main.swift /Users/sergej/Developer/CombineExploration/CombineExploration/CustomSubscription.swift /Users/sergej/Developer/CombineExploration/CombineExploration/CustomPublisher.swift -emit-module-path /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/Objects-normal/x86_64/main~partial.swiftmodule -emit-module-doc-path /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/Objects-normal/x86_64/main~partial.swiftdoc -serialize-diagnostics-path /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/Objects-normal/x86_64/main.dia -emit-dependencies-path /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/Objects-normal/x86_64/main.d -emit-reference-dependencies-path /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/Objects-normal/x86_64/main.swiftdeps -target x86_64-apple-macos10.15 -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -I /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Products/Debug -F /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Products/Debug -enable-testing -g -module-cache-path /Users/sergej/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -swift-version 5 -enforce-exclusivity=checked -Onone -D DEBUG -serialize-debugging-options -Xcc -working-directory -Xcc /Users/sergej/Developer/CombineExploration -enable-anonymous-context-mangled-names -Xcc -I/Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/CombineExploration-generated-files.hmap -Xcc -I/Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/CombineExploration-own-target-headers.hmap -Xcc -I/Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/CombineExploration-all-target-headers.hmap -Xcc -iquote -Xcc /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/CombineExploration-project-headers.hmap -Xcc -I/Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Products/Debug/include -Xcc -I/Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/DerivedSources-normal/x86_64 -Xcc -I/Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/DerivedSources/x86_64 -Xcc -I/Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/DerivedSources -Xcc -DDEBUG=1 -module-name CombineExploration -o /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Build/Intermediates.noindex/CombineExploration.build/Debug/CombineExploration.build/Objects-normal/x86_64/main.o -index-store-path /Users/sergej/Library/Developer/Xcode/DerivedData/CombineExploration-demsvwpbjfoenlhjrwnroopqwsel/Index/DataStore -index-system-modules 
1.  While running pass #​0 SILModuleTransform "SerializeSILPass".
2.  While serializing 'wat' (at /Users/sergej/Developer/CombineExploration/CombineExploration/main.swift:25:8)
0  swift                    0x0000000107afda13 PrintStackTraceSignalHandler(void*) + 51
1  swift                    0x0000000107afd1e6 SignalHandler(int) + 358
2  libsystem_platform.dylib 0x00007fff64e6fb1d _sigtramp + 29
3  libsystem_platform.dylib 0x00007fb42071a1a0 _sigtramp + 3146426016
4  swift                    0x0000000104648841 swift::ParamDecl::getDefaultValueStringRepresentation(llvm::SmallVectorImpl<char>&) const + 1201
5  swift                    0x00000001043cf98a swift::serialization::Serializer::writeDecl(swift::Decl const*) + 5946
6  swift                    0x00000001043f542f swift::serialization::Serializer::writeAllDeclsAndTypes() + 62287
7  swift                    0x00000001044023f4 swift::serialization::Serializer::writeAST(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, bool) + 5364
8  swift                    0x000000010440f330 swift::serialization::Serializer::writeToStream(llvm::raw_ostream&, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SILModule const*, swift::SerializationOptions const&) + 6016
9  swift                    0x0000000104410c0b bool llvm::function_ref<bool (llvm::raw_pwrite_stream&)>::callback_fn<swift::serialize(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SerializationOptions const&, swift::SILModule const*)::$_8>(long, llvm::raw_pwrite_stream&) + 139
10 swift                    0x0000000103717729 swift::withOutputFile(swift::DiagnosticEngine&, llvm::StringRef, llvm::function_ref<bool (llvm::raw_pwrite_stream&)>) + 2569
11 swift                    0x0000000104410a67 swift::serialize(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SerializationOptions const&, swift::SILModule const*) + 311
12 swift                    0x00000001037531bb std::__1::__function::__func<performCompileStepsPostSILGen(swift::CompilerInstance&, swift::CompilerInvocation&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> >, bool, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, bool, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*)::$_12, std::__1::allocator<performCompileStepsPostSILGen(swift::CompilerInstance&, swift::CompilerInvocation&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> >, bool, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, bool, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*)::$_12>, void ()>::operator()() + 603
13 swift                    0x0000000103efac61 SerializeSILPass::run() + 49
14 swift                    0x0000000103df1129 swift::SILPassManager::execute() + 7305
15 swift                    0x0000000103a4dc0b swift::CompilerInstance::performSILProcessing(swift::SILModule*, swift::UnifiedStatsReporter*) + 1563
16 swift                    0x0000000103749375 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 33925
17 swift                    0x000000010373d6e4 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 6820
18 swift                    0x00000001036cabe3 main + 1219
19 libdyld.dylib            0x00007fff64c6e2e5 start + 1
20 libdyld.dylib            0x0000000000000049 start + 2604211557
error: Segmentation fault: 11 (in target 'CombineExploration' from project 'CombineExploration')
@beccadax
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beccadax commented Dec 2, 2019

@swift-ci create

@theblixguy
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This doesn’t crash on master

@slavapestov
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I'm adding a regression test.

@theblixguy
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Thanks!

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@slavapestov @beccadax @theblixguy @swift-ci