Crash while compiling simple program

[migueldeicaza]

Description

The following simple program crashes the Swift compiler:

class Demo {
    var output: TextOutputStream
    init (o: TextOutputStream) {
        self.output = o
    }

    func x () {
        print ("a", to: &output)
    }
}

Steps to reproduce

Put the above text snippet into a file, and then invoke the compiler like this:

swiftc -c demo.swift

Expected behavior

It should compile without a crash, instead you get:

1.	Apple Swift version 5.9.2 (swiftlang-5.9.2.2.51 clang-1500.1.0.2.2)
2.	Compiling with the current language version
3.	While evaluating request IRGenRequest(IR Generation for file "/tmp/a.swift")
4.	While emitting IR SIL function "@$s1a4DemoV1xyyF".
 for 'x()' (at /tmp/a.swift:7:14)
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x00000001083a4c40 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x00000001083a39dc llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x00000001040ee668 SignalHandler(int) + 352
3  libsystem_platform.dylib 0x00000001829e1a24 _sigtramp + 56
4  swift-frontend           0x0000000106b20f10 swift::irgen::emitArchetypeTypeMetadataRef(swift::irgen::IRGenFunction&, swift::CanTypeWrapper<swift::ArchetypeType>, swift::irgen::DynamicMetadataRequest) + 288
5  swift-frontend           0x00000001056280c0 emitDirectTypeMetadataRef(swift::irgen::IRGenFunction&, swift::CanType, swift::irgen::DynamicMetadataRequest) + 252
6  swift-frontend           0x000000010407a160 swift::irgen::IRGenFunction::emitTypeMetadataRef(swift::CanType, swift::irgen::DynamicMetadataRequest) + 292
7  swift-frontend           0x0000000104aad940 swift::irgen::emitGenericRequirementFromSubstitutions(swift::irgen::IRGenFunction&, swift::GenericRequirement, swift::MetadataState, swift::SubstitutionMap, bool) + 264
8  swift-frontend           0x0000000103b4304c void llvm::function_ref<void (swift::GenericRequirement)>::callback_fn<(anonymous namespace)::EmitPolymorphicArguments::emit(swift::SubstitutionMap, swift::irgen::WitnessMetadata*, swift::irgen::Explosion&)::$_17>(long, swift::GenericRequirement) + 64
9  swift-frontend           0x0000000103b44464 void llvm::function_ref<void (swift::GenericRequirement)>::callback_fn<(anonymous namespace)::PolymorphicConvention::enumerateUnfulfilledRequirements(llvm::function_ref<void (swift::GenericRequirement)> const&)::$_8>(long, swift::GenericRequirement) + 212
10 swift-frontend           0x0000000104adc4e0 void llvm::function_ref<void (swift::GenericTypeParamType*, bool)>::callback_fn<swift::irgen::enumerateGenericSignatureRequirements(swift::CanGenericSignature, llvm::function_ref<void (swift::GenericRequirement)> const&)::$_0>(long, swift::GenericTypeParamType*, bool) (.llvm.13441421060209707708) + 76
11 swift-frontend           0x0000000105fb51c4 swift::GenericSignatureImpl::forEachParam(llvm::function_ref<void (swift::GenericTypeParamType*, bool)>) const + 752
12 swift-frontend           0x00000001069e1d38 swift::irgen::enumerateGenericSignatureRequirements(swift::CanGenericSignature, llvm::function_ref<void (swift::GenericRequirement)> const&) + 148
13 swift-frontend           0x0000000106a22cfc swift::irgen::emitPolymorphicArguments(swift::irgen::IRGenFunction&, swift::CanTypeWrapper<swift::SILFunctionType>, swift::SubstitutionMap, swift::irgen::WitnessMetadata*, swift::irgen::Explosion&) + 344
14 swift-frontend           0x0000000107c26a50 (anonymous namespace)::IRGenSILFunction::visitFullApplySite(swift::FullApplySite) + 3784
15 swift-frontend           0x0000000107a38898 (anonymous namespace)::IRGenSILFunction::visitSILBasicBlock(swift::SILBasicBlock*) + 2788
16 swift-frontend           0x000000010313a580 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 11680
17 swift-frontend           0x0000000105639244 swift::irgen::IRGenerator::emitGlobalTopLevel(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>> const&) + 2516
18 swift-frontend           0x0000000103ceea98 swift::IRGenRequest::evaluate(swift::Evaluator&, swift::IRGenDescriptor) const + 6532
19 swift-frontend           0x0000000107a13698 swift::SimpleRequest<swift::IRGenRequest, swift::GeneratedModule (swift::IRGenDescriptor), (swift::RequestFlags)9>::evaluateRequest(swift::IRGenRequest const&, swift::Evaluator&) + 176
20 swift-frontend           0x00000001074ab80c llvm::Expected<swift::IRGenRequest::OutputType> swift::Evaluator::getResultUncached<swift::IRGenRequest>(swift::IRGenRequest const&) + 1480
21 swift-frontend           0x0000000107210b4c swift::performIRGeneration(swift::FileUnit*, swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::GlobalVariable**) + 264
22 swift-frontend           0x0000000107c4b024 generateIR(swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, llvm::GlobalVariable*&, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>) + 156
23 swift-frontend           0x0000000107c53df0 performCompileStepsPostSILGen(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 1596
24 swift-frontend           0x0000000107c4dc30 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1748
25 swift-frontend           0x0000000107c51e6c swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 4568
26 swift-frontend           0x0000000107cb0864 swift::mainEntry(int, char const**) + 4408
27 dyld                     0x0000000182639058 start + 2224
Segmentation fault: 11

Environment

Happens with both Xcode 15.0, and the 15.1 beta, the version for the beta:

• Swift compiler version info swift-driver version: 1.87.3 Apple Swift version 5.9.2 (swiftlang-5.9.2.2.51 clang-1500.1.0.2.2)

• Xcode version info 15.0 15A240d (but also happens with the beta)

• Deployment target: MacOS, or iOS.