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[SR-2916] Compiler crash when using a lazy var to implement property in @objc protocol #45510

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swift-ci opened this issue Oct 11, 2016 · 2 comments

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@swift-ci
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@swift-ci swift-ci commented Oct 11, 2016

Previous ID SR-2916
Radar rdar://28717361
Original Reporter darrenclark (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Environment

Swift 3 in Xcode 8.0 (8A218a)

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

md5: b364b2f201e84326b8a9667c8ba31cb4

is duplicated by:

relates to:

  • SR-2673 @NSManaged property can't satisfy protocol requirement

Issue Description:

Swift 3 compiler in Xcode 8.0 (8A218a) crashes when using a lazy var to implement a property in an @objc protocol.

A sample project that reproduces the issue is attached, but here's the gist of it:

@objc protocol MyProtocol {
    var myView: UIView? { get }
}

class ViewController: UIViewController, MyProtocol {
    lazy var myView: UIView? = {
        let myView = UIView()
        myView.backgroundColor = .red
        return myView
    }()
}

Stack trace:

0  swift                    0x000000010ec78b6d PrintStackTraceSignalHandler(void*) + 45
1  swift                    0x000000010ec785b6 SignalHandler(int) + 470
2  libsystem_platform.dylib 0x00007fff89c8852a _sigtramp + 26
3  libsystem_platform.dylib 0x00007fc7134ef588 _sigtramp + 2307289208
4  swift                    0x000000010c657233 swift::Lowering::TypeConverter::getFunctionInterfaceTypeWithCaptures(swift::CanTypeWrapper<swift::AnyFunctionType>, swift::AnyFunctionRef) + 67
5  swift                    0x000000010c659298 swift::Lowering::TypeConverter::makeConstantInterfaceType(swift::SILDeclRef) + 872
6  swift                    0x000000010c606715 swift::Lowering::TypeConverter::getConstantInfo(swift::SILDeclRef) + 165
7  swift                    0x000000010c606fd6 swift::Lowering::TypeConverter::getConstantSelfParameter(swift::SILDeclRef) + 38
8  swift                    0x000000010c2b5f9e (anonymous namespace)::AccessorBasedComponent<swift::Lowering::PhysicalPathComponent>::getBaseAccessKind(swift::Lowering::SILGenFunction&, swift::AccessKind) const + 30
9  swift                    0x000000010c2c0d99 drillToLastComponent(swift::Lowering::SILGenFunction&, swift::SILLocation, swift::Lowering::LValue&&, swift::Lowering::ManagedValue&, swift::AccessKind) + 137
10 swift                    0x000000010c2c2be3 swift::Lowering::SILGenFunction::emitLoadOfLValue(swift::SILLocation, swift::Lowering::LValue&&, swift::Lowering::SGFContext, bool) + 227
11 swift                    0x000000010c293d57 swift::ASTVisitor<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::visit(swift::Expr*, swift::Lowering::SGFContext) + 20439
12 swift                    0x000000010c2ef1ab swift::Lowering::SILGenFunction::emitReturnExpr(swift::SILLocation, swift::Expr*) + 491
13 swift                    0x000000010c2eb9e7 swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 183
14 swift                    0x000000010c2ec8e6 swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 4022
15 swift                    0x000000010c2ad2ca swift::Lowering::SILGenFunction::emitFunction(swift::FuncDecl*) + 314
16 swift                    0x000000010c229855 swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*)::$_1::operator()(swift::SILFunction*) const + 1877
17 swift                    0x000000010c228402 swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*) + 626
18 swift                    0x000000010c2f3967 (anonymous namespace)::SILGenType::emitType() + 1271
19 swift                    0x000000010c2f33fe swift::Lowering::SILGenModule::visitNominalTypeDecl(swift::NominalTypeDecl*) + 30
20 swift                    0x000000010c235173 swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) + 1795
21 swift                    0x000000010c236e2d swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*, llvm::Optional<unsigned int>, bool, bool) + 1629
22 swift                    0x000000010c08e16f performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*) + 19503
23 swift                    0x000000010c087265 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 17029
24 swift                    0x000000010c04482d main + 8685
25 libdyld.dylib            0x00007fff870025ad start + 1
Stack dump:
0.  Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c /Users/dclark/Desktop/LazyVarCompilerSegfault/LazyVarCompilerSegfault/MyProtocol.swift -primary-file /Users/dclark/Desktop/LazyVarCompilerSegfault/LazyVarCompilerSegfault/ViewController.swift /Users/dclark/Desktop/LazyVarCompilerSegfault/LazyVarCompilerSegfault/AppDelegate.swift -target x86_64-apple-ios10.0 -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.0.sdk -I /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Products/Debug-iphonesimulator -F /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Products/Debug-iphonesimulator -enable-testing -g -module-cache-path /Users/dclark/Library/Developer/Xcode/DerivedData/ModuleCache -D DEBUG -serialize-debugging-options -Xcc -I/Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/LazyVarCompilerSegfault-generated-files.hmap -Xcc -I/Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/LazyVarCompilerSegfault-own-target-headers.hmap -Xcc -I/Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/LazyVarCompilerSegfault-all-target-headers.hmap -Xcc -iquote -Xcc /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/LazyVarCompilerSegfault-project-headers.hmap -Xcc -I/Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Products/Debug-iphonesimulator/include -Xcc -I/Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/DerivedSources/x86_64 -Xcc -I/Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -working-directory/Users/dclark/Desktop/LazyVarCompilerSegfault -emit-module-doc-path /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/Objects-normal/x86_64/ViewController~partial.swiftdoc -Onone -module-name LazyVarCompilerSegfault -emit-module-path /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/Objects-normal/x86_64/ViewController~partial.swiftmodule -serialize-diagnostics-path /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/Objects-normal/x86_64/ViewController.dia -emit-dependencies-path /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/Objects-normal/x86_64/ViewController.d -emit-reference-dependencies-path /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/Objects-normal/x86_64/ViewController.swiftdeps -o /Users/dclark/Library/Developer/Xcode/DerivedData/LazyVarCompilerSegfault-exrswzjccbqiyfboyfxcmqtrxget/Build/Intermediates/LazyVarCompilerSegfault.build/Debug-iphonesimulator/LazyVarCompilerSegfault.build/Objects-normal/x86_64/ViewController.o 
1.  While emitting SIL for getter for myView at /Users/dclark/Desktop/LazyVarCompilerSegfault/LazyVarCompilerSegfault/ViewController.swift:26:14
@belkadan
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@belkadan belkadan commented Oct 11, 2016

This is likely the same underlying problem as with @NSManaged in SR-2673, but it'll need the more general fix.

@slavapestov
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@slavapestov slavapestov commented Dec 23, 2016

No longer crashes on master.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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