[SR-15762] Segfault on conditional conformance + inlinable + release

[stephencelis]

Previous ID	SR-15762
Radar	None
Original Reporter	@stephencelis
Type	Bug

Attachment: Download

Environment

Swift 5.5

Additional Detail from JIRA

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

md5: 5ff3237eb79b66fd10ee4699e8ebf98f

Issue Description:

Check out the attached reduced project and build the "swift-parsing-benchmark" target for release. It will segfault with the following output:

1. Apple Swift version 5.5.2 (swiftlang-1300.0.47.5 clang-1300.0.29.30)
2.
3. While evaluating request ExecuteSILPipelineRequest(Run pipelines { PrepareOptimizationPasses, EarlyModulePasses, HighLevel,Function+EarlyLoopOpt, HighLevel,Module+StackPromote, Serialize, MidLevel,Function, ClosureSpecialize, LowLevel,Function, LateLoopOpt, SIL Debug Info Generator } on SIL for swift_parsing_benchmark.swift_parsing_benchmark)
4. While running pass #​86 SILFunctionTransform "GenericSpecializer" on SILFunction "@main".
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           0x00000001083f79c4 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x00000001083f6acc llvm::sys::RunSignalHandlers() + 128
2  swift-frontend           0x00000001083f8004 SignalHandler(int) + 292
3  libsystem_platform.dylib 0x00000001945284e4 _sigtramp + 56
4  swift-frontend           0x0000000105190198 swift::GenericSignatureImpl::getConformanceAccessPath(swift::Type, swift::ProtocolDecl*) const + 68
5  swift-frontend           0x0000000105190198 swift::GenericSignatureImpl::getConformanceAccessPath(swift::Type, swift::ProtocolDecl*) const + 68
6  swift-frontend           0x00000001051905c0 swift::GenericSignatureImpl::getConformanceAccessPath(swift::Type, swift::ProtocolDecl*) const + 1132
7  swift-frontend           0x0000000105230eac swift::SubstitutionMap::lookupConformance(swift::CanType, swift::ProtocolDecl*) const + 552
8  swift-frontend           0x0000000105220560 swift::ProtocolConformanceRef::subst(swift::Type, llvm::function_ref<swift::Type (swift::SubstitutableType*)>, llvm::function_ref<swift::ProtocolConformanceRef (swift::CanType, swift::Type, swift::ProtocolDecl*)>, swift::SubstOptions) const + 1088
9  swift-frontend           0x0000000104b3d474 swift::SILCloner<swift::GenericCloner>::getOpConformance(swift::Type, swift::ProtocolConformanceRef) + 248
10 swift-frontend           0x0000000104b3881c swift::SILInstructionVisitor<swift::GenericCloner, void>::visit(swift::SILInstruction*) + 27252
11 swift-frontend           0x0000000104b30c80 swift::GenericCloner::populateCloned() + 1308
12 swift-frontend           0x0000000104b450f8 swift::GenericFuncSpecializer::tryCreateSpecialization(bool) + 748
13 swift-frontend           0x0000000104b470a0 swift::trySpecializeApplyOfGeneric(swift::SILOptFunctionBuilder&, swift::ApplySite, llvm::SmallSetVector<swift::SILInstruction*, 8u>&, llvm::SmallVectorImpl<swift::SILFunction*>&, swift::OptRemark::Emitter&) + 3368
14 swift-frontend           0x0000000104a6c5e0 (anonymous namespace)::GenericSpecializer::run() + 932
15 swift-frontend           0x00000001049dee78 swift::SILPassManager::runFunctionPasses(unsigned int, unsigned int) + 3524
16 swift-frontend           0x00000001049db8cc swift::SILPassManager::executePassPipelinePlan(swift::SILPassPipelinePlan const&) + 164
17 swift-frontend           0x00000001049f2fb4 swift::SimpleRequest<swift::ExecuteSILPipelineRequest, std::__1::tuple<> (swift::SILPipelineExecutionDescriptor), (swift::RequestFlags)1>::evaluateRequest(swift::ExecuteSILPipelineRequest const&, swift::Evaluator&) + 56
18 swift-frontend           0x00000001049e2b00 llvm::Expected<swift::ExecuteSILPipelineRequest::OutputType> swift::Evaluator::getResultUncached<swift::ExecuteSILPipelineRequest>(swift::ExecuteSILPipelineRequest const&) + 476
19 swift-frontend           0x00000001049e49d4 swift::runSILOptimizationPasses(swift::SILModule&) + 352
20 swift-frontend           0x00000001042a7a48 swift::CompilerInstance::performSILProcessing(swift::SILModule*) + 1032
21 swift-frontend           0x0000000104175bb0 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*) + 1036
22 swift-frontend           0x0000000104169790 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 7060
23 swift-frontend           0x00000001040c2df8 main + 932
24 dyld                     0x000000010a68d0f4 start + 520
error: Segmentation fault: 11 (in target 'swift-parsing-benchmark' from project 'swift-parsing')

Removing "@inlinable" from "Optionally.print" fixes things, as does simplifying the project further (removing the "Parser" protocol and just having "Printer").