[SR-12456] Swift 5.2 - Segmentation Fault of didSet
override of a computed class property
#54895
Labels
bug
A deviation from expected or documented behavior. Also: expected but undesirable behavior.
compiler
The Swift compiler in itself
crash
Bug: A crash, i.e., an abnormal termination of software
type checker
Area → compiler: Semantic analysis
Environment
macOS 10.15.3 | Xcode 11.4 | Swift 5.2
Additional Detail from JIRA
md5: 2cfb06cf828fdae23571c9a9f46e4e65
Issue Description:
Hi,
Thanks for considering this bug.
Please let me know in case I can help you with further information. This is the minimal working example I came up with to run into the issue.
Minimal Working Example
The following piece of code is causing a segmentation fault (11) since Swift 5.2
Output
// Stack dump:Stack dump:0. Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret foo2.swift -enable-objc-interop -stack-check -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -color-diagnostics -module-name foo21. Apple Swift version 5.2 (swiftlang-1103.0.32.1 clang-1103.0.32.29)2. While evaluating request TypeCheckSourceFileRequest(source_file "foo2.swift", 0)3. While evaluating request TypeCheckFunctionBodyUntilRequest(foo2.(file).Narf._@foo2.swift:16:24, )4. While type-checking getter for instance (at foo2.swift:16:24)5. While evaluating request ParseAbstractFunctionBodyRequest(foo2.(file).Narf._@foo2.swift:16:24)0 swift 0x000000010aeb44ea PrintStackTraceSignalHandler(void*) + 421 swift 0x000000010aeb3cc0 SignalHandler(int) + 3522 libsystem_platform.dylib 0x00007fff7303342d _sigtramp + 293 libsystem_platform.dylib 0x00007fb114861158 _sigtramp + 27097081044 swift 0x00000001078bc2a6 synthesizeAccessorBody(swift::AbstractFunctionDecl*, void*) + 17025 swift 0x0000000107aef4a8 swift::SimpleRequest<swift::ParseAbstractFunctionBodyRequest, swift::BraceStmt* (swift::AbstractFunctionDecl*), (swift::CacheKind)2>::evaluateRequest(swift::ParseAbstractFunctionBodyRequest const&, swift::Evaluator&) + 1686 swift 0x0000000107c0713b swift::ParseAbstractFunctionBodyRequest::OutputType swift::evaluateOrDefault<swift::ParseAbstractFunctionBodyRequest>(swift::Evaluator&, swift::ParseAbstractFunctionBodyRequest, swift::ParseAbstractFunctionBodyRequest::OutputType) + 12117 swift 0x00000001078a9ab4 swift::SimpleRequest<swift::TypeCheckFunctionBodyUntilRequest, bool (swift::AbstractFunctionDecl*, swift::SourceLoc), (swift::CacheKind)1>::evaluateRequest(swift::TypeCheckFunctionBodyUntilRequest const&, swift::Evaluator&) + 7568 swift 0x00000001078b0b6e swift::TypeCheckFunctionBodyUntilRequest::OutputType swift::evaluateOrDefault<swift::TypeCheckFunctionBodyUntilRequest>(swift::Evaluator&, swift::TypeCheckFunctionBodyUntilRequest, swift::TypeCheckFunctionBodyUntilRequest::OutputType) + 7189 swift 0x00000001078df6ce swift::TypeCheckSourceFileRequest::evaluate(swift::Evaluator&, swift::SourceFile*, unsigned int) const + 627010 swift 0x00000001078aeb47 swift::SimpleRequest<swift::TypeCheckSourceFileRequest, bool (swift::SourceFile*, unsigned int), (swift::CacheKind)2>::evaluateRequest(swift::TypeCheckSourceFileRequest const&, swift::Evaluator&) + 2311 swift 0x00000001078dcfce swift::performTypeChecking(swift::SourceFile&, unsigned int) + 100612 swift 0x0000000106f1105b swift::CompilerInstance::performSemaUpTo(swift::SourceFile::ASTStage_t) + 591513 swift 0x0000000106bfd2c9 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 1028114 swift 0x0000000106b7e4d3 main + 128315 libdyld.dylib 0x00007fff72e3a7fd start + 116 libdyld.dylib 0x000000000000000b start + 2367445007[1] 67342 segmentation fault swift foo2.swift
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