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[SR-9305] reproducible crash when I add a type constraint to generic class #51776

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swift-ci opened this issue Nov 20, 2018 · 1 comment
Closed

[SR-9305] reproducible crash when I add a type constraint to generic class #51776

swift-ci opened this issue Nov 20, 2018 · 1 comment
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@aschwaighofer
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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

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@swift-ci
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Previous ID SR-9305
Radar rdar://46173958
Original Reporter justin.garcia (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Xcode 10.0 on macOS 10.14.1

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, CompilerCrash
Assignee @aschwaighofer
Priority Medium

md5: 3b26e3f6b69fd1ce6c6fd4b2981b9952

Issue Description:

I have this class:

class PickerSectionProvider<T>: PickerItemProvider {
    func item(at index: Int) -> T? {
        return nil
    }
}

This compiles fine. But when I add a type constraint to T (Syncable), Xcode crashes. The crash is reproducible. Sorry I couldn’t get the crashtrace to paste here without losing line breaks. Here is the very top of the crashtrace (the full crash log is attached):

0   swift                         0x000000010c2344b6 swift::irgen::CallEmission::emitCallSite() + 102
1   swift                         0x000000010c23701c swift::irgen::CallEmission::emitToExplosion(swift::irgen::Explosion&, bool) + 940
2   swift                         0x000000010c3c15cc (anonymous namespace)::IRGenSILFunction::visitFullApplySite(swift::FullApplySite) + 2940
3   swift                         0x000000010c39fdd1 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 9825
4   swift                         0x000000010c282c90 swift::irgen::IRGenerator::emitLazyDefinitions() + 1472
5   swift                         0x000000010c3804ca performIRGeneration(swift::IRGenOptions&, swift::ModuleDecl*, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> >, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::LLVMContext&, swift::SourceFile*, llvm::GlobalVariable**, unsigned int) + 1562
6   swift                         0x000000010c1c0a10 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 46928

A reduction (an Xcode project) that demonstrates the issue is attached.
@slavapestov
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Looks like Arnold already merged a fix: #20865

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
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@aschwaighofer aschwaighofer

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
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@slavapestov @swift-ci @AnthonyLatsis