[SR-5825] Compiler crash when using default associatedtype on class

[hartbit]

Previous ID	SR-5825
Radar	rdar://problem/34259885
Original Reporter	@hartbit
Type	Bug
Status	Resolved
Resolution	Done

Environment

Xcode 9.0 beta 6 (9M214v)

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, CompilerCrash
Assignee	None
Priority	Medium

md5: 5575df59a1e4bd399a6d13105c90ba54

Issue Description:

The following piece of code crashes the compiler in Xcode 9 beta 6:

struct DefaultAssociatedType {
}

protocol Protocol {
    associatedtype AssociatedType = DefaultAssociatedType
    init(object: AssociatedType)
}

final class Conformance: Protocol {
    private let object: AssociatedType
    init(object: AssociatedType) {
        self.object = object
    }
}

Here's the stack trace:

0  swift                    0x000000010d9ae42a PrintStackTraceSignalHandler(void*) + 42
1  swift                    0x000000010d9ad866 SignalHandler(int) + 662
2  libsystem_platform.dylib 0x00007fffceaa9b3a _sigtramp + 26
3  swift                    0x000000010df4075f (anonymous namespace)::OldDemangler::demangleIdentifier(llvm::Optional<swift::Demangle::Node::Kind>)::op_char_table + 1055
4  swift                    0x000000010b0a71b6 swift::Lowering::TypeConverter::getFunctionInterfaceTypeWithCaptures(swift::CanTypeWrapper<swift::AnyFunctionType>, swift::AnyFunctionRef) + 406
5  swift                    0x000000010b029e9c swift::Lowering::TypeConverter::getConstantInfo(swift::SILDeclRef) + 492
6  swift                    0x000000010b04a36f swift::SILModule::getOrCreateFunction(swift::SILLocation, swift::SILDeclRef, swift::ForDefinition_t) + 95
7  swift                    0x000000010ab8099d swift::Lowering::SILGenModule::getFunction(swift::SILDeclRef, swift::ForDefinition_t) + 333
8  swift                    0x000000010ab83a15 swift::Lowering::SILGenModule::emitConstructor(swift::ConstructorDecl*) + 1765
9  swift                    0x000000010ac63980 (anonymous namespace)::SILGenType::emitType() + 896
10 swift                    0x000000010ab892ba swift::ASTVisitor<swift::Lowering::SILGenModule, void, void, void, void, void, void>::visit(swift::Decl*) + 74
11 swift                    0x000000010ab8857b swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) + 1115
12 swift                    0x000000010ab89f09 swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*, llvm::Optional<unsigned int>, bool) + 841
13 swift                    0x000000010a3227d6 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 13014
14 swift                    0x000000010a31dc94 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 7716
15 swift                    0x000000010a2d2bb8 main + 12248
16 libdyld.dylib            0x00007fffce89a235 start + 1
17 libdyld.dylib            0x0000000000000044 start + 829840912
Stack dump:
0.  Program arguments: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c /Users/david/Desktop/CompilerCrash/CompilerCrash/ViewController.swift -primary-file /Users/david/Desktop/CompilerCrash/CompilerCrash/Protocol.swift /Users/david/Desktop/CompilerCrash/CompilerCrash/AppDelegate.swift -target x86_64-apple-ios11.0 -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator11.0.sdk -I /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Products/Debug-iphonesimulator -F /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Products/Debug-iphonesimulator -enable-testing -g -module-cache-path /Users/david/Library/Developer/Xcode/DerivedData/ModuleCache -swift-version 4 -enforce-exclusivity=checked -D DEBUG -serialize-debugging-options -Xcc -I/Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/CompilerCrash-generated-files.hmap -Xcc -I/Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/CompilerCrash-own-target-headers.hmap -Xcc -I/Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/CompilerCrash-all-target-headers.hmap -Xcc -iquote -Xcc /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/CompilerCrash-project-headers.hmap -Xcc -I/Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Products/Debug-iphonesimulator/include -Xcc -I/Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/DerivedSources/x86_64 -Xcc -I/Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -working-directory/Users/david/Desktop/CompilerCrash -emit-module-doc-path /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/Objects-normal/x86_64/Protocol~partial.swiftdoc -serialize-diagnostics-path /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/Objects-normal/x86_64/Protocol.dia -Onone -module-name CompilerCrash -emit-module-path /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/Objects-normal/x86_64/Protocol~partial.swiftmodule -emit-dependencies-path /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/Objects-normal/x86_64/Protocol.d -emit-reference-dependencies-path /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/Objects-normal/x86_64/Protocol.swiftdeps -o /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Build/Intermediates.noindex/CompilerCrash.build/Debug-iphonesimulator/CompilerCrash.build/Objects-normal/x86_64/Protocol.o -index-store-path /Users/david/Library/Developer/Xcode/DerivedData/CompilerCrash-gipsoiznlwkwdkahfsjuhyrdddib/Index/DataStore -index-system-modules 

[belkadan]

An asserts-enabled build shows the good old

Assertion failed: ((HadError || !M.is<SourceFile*>() || M.get<SourceFile*>()->ASTStage < SourceFile::TypeChecked) && "UnresolvedDot" "in wrong phase"), function walkToExprPre, file /Volumes/Data/swift-public/swift/include/swift/AST/ExprNodes.def, line 87.

2. While walking into body of 'init(object:)' at <stdin>:11:5

@swift-ci create

[DougGregor]

419b6f0