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[SR-7591] Compiler segfault 11: Cyclic declaration with a guard statement #50133

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swift-ci opened this issue May 3, 2018 · 3 comments
Closed

[SR-7591] Compiler segfault 11: Cyclic declaration with a guard statement #50133

swift-ci opened this issue May 3, 2018 · 3 comments
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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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swift-ci commented May 3, 2018

Previous ID SR-7591
Radar rdar://problem/39978219
Original Reporter tdimeco (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate

Attachment: Download

Environment

Apple Swift version 4.1 (swiftlang-902.0.48 clang-902.0.37.1)

Xcode 9.3 (9E145)

macOS 10.13.4 (17E202)

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

md5: 8fcced680f2c7d9d52f448773a617e4b

duplicates:

  • SR-7567 Crash lowering ill-scoped use of variable

relates to:

  • SR-7567 Crash lowering ill-scoped use of variable

Issue Description:

Hello,

There is Segmentation fault: 11 compiler crash while emitting SIL for a function containing a cyclic declaration between a guard statement and un let, for instance:

func foo() {
    guard let a = b else { return }
    let b = a
}

Here is the complete stack trace of the swift foo.swift command:

Thomas:~$ swift foo.swift 
0  swift                    0x000000010ad2affa PrintStackTraceSignalHandler(void*) + 42
1  swift                    0x000000010ad2a3b6 SignalHandler(int) + 966
2  libsystem_platform.dylib 0x00007fff77a1df5a _sigtramp + 26
3  libsystem_platform.dylib 0x000000000a12a81e _sigtramp + 2456864990
4  swift                    0x0000000108701aaf swift::NominalTypeDecl::hasFixedLayout(swift::ModuleDecl*, swift::ResilienceExpansion) const + 31
5  swift                    0x000000010822b3e1 (anonymous namespace)::LowerType::visitAnyStructType(swift::CanType, swift::StructDecl*) + 49
6  swift                    0x0000000108229c2f swift::Lowering::TypeConverter::getTypeLowering(swift::Lowering::AbstractionPattern, swift::Type) + 3743
7  swift                    0x0000000107c9510d swift::Lowering::SILGenFunction::emitInitializationForVarDecl(swift::VarDecl*, bool) + 1773
8  swift                    0x0000000107c97768 swift::ASTVisitor<(anonymous namespace)::InitializationForPattern, void, void, void, std::__1::unique_ptr<swift::Lowering::Initialization, std::__1::default_delete<swift::Lowering::Initialization> >, void, void>::visit(swift::Pattern*) + 360
9  swift                    0x0000000107c99a8d swift::Lowering::SILGenFunction::emitStmtCondition(llvm::MutableArrayRef<swift::StmtConditionElement>, swift::Lowering::JumpDest, swift::SILLocation, swift::ProfileCounter, swift::ProfileCounter) + 845
10 swift                    0x0000000107d17634 swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 15732
11 swift                    0x0000000107d15218 swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 6488
12 swift                    0x0000000107cd16cb swift::Lowering::SILGenFunction::emitFunction(swift::FuncDecl*) + 379
13 swift                    0x0000000107c398c5 swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*)::$_1::operator()(swift::SILFunction*) const + 565
14 swift                    0x0000000107c38cb5 swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*) + 741
15 swift                    0x0000000107c41cdb swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) + 1371
16 swift                    0x0000000107c43b32 swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*, llvm::Optional<unsigned int>, bool) + 1490
17 swift                    0x000000010738845c performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 27500
18 swift                    0x000000010737fe64 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 7908
19 swift                    0x00000001073348b5 main + 18917
20 libdyld.dylib            0x00007fff7770f015 start + 1
21 libdyld.dylib            0x000000000000000a start + 2291077110
Stack dump:
0.  Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret foo.swift -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -color-diagnostics -module-name foo 
1.  While emitting SIL for 'foo()' at foo.swift:1:1
2.  While silgen emitFunction SIL function "@_T03fooAAyyF".
 for 'foo()' at foo.swift:1:1
Segmentation fault: 11

Feel free to ask if you need more details.

Have a good day!

Thomas
@belkadan
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belkadan commented May 4, 2018

Likely the same root cause as SR-7567, but maybe not.

@belkadan
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belkadan commented May 4, 2018

@swift-ci create

@eeckstein
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Already fixed on master.

@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
This issue was closed.
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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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