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[SR-12607] 5.2 Crasher #55051

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dduan opened this issue Apr 16, 2020 · 0 comments
Closed

[SR-12607] 5.2 Crasher #55051

dduan opened this issue Apr 16, 2020 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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@dduan
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dduan commented Apr 16, 2020

Previous ID SR-12607
Radar None
Original Reporter @dduan
Type Bug
Status Resolved
Resolution Duplicate
Environment

Version 11.3.1 (11C505)

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

md5: 0255a283fd5bd5170bf9318bd7492636

duplicates:

  • SR-8814 GenericSignatureBuilder should re-introduce conformance requirements when adding a superclass requirement

Issue Description:

Compiling the following code leads to compiler crash:

protocol P {
    associatedtype B: Equatable
    func f()
}
extension P {
    func f() {}
}
class C<B>: P where B: Equatable {}

The backtrace from Swift 5.2

Stack dump:
0.  Program arguments: /Applications/Xcode_11.4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret /tmp/test.swift -enable-objc-interop -stack-check -sdk /Applications/Xcode_11.4.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -module-name test -- -o /tmp/a 
1.  Apple Swift version 5.2 (swiftlang-1103.0.32.1 clang-1103.0.32.29)
2.  While generating SIL witness table protocol conformance to 'P' (at /tmp/test.swift:1:1) for type 'C<B>' (declared at [/tmp/test.swift:8:1 - line:8:35] RangeText="class C<B>: P where B: Equatable {")
3.  While generating protocol witness thunk SIL function "@$s4test1CCyqd__GAA1PA2aEP1fyyFTW".
 for 'f()' (at /tmp/test.swift:6:5)
0  swift                    0x0000000104c014ea PrintStackTraceSignalHandler(void*) + 42
1  swift                    0x0000000104c00cc0 SignalHandler(int) + 352
2  libsystem_platform.dylib 0x00007fff711585fd _sigtramp + 29
3  libsystem_platform.dylib 0x00007ffeef34fc20 _sigtramp + 2115991104
4  swift                    0x0000000100e078ad swift::Lowering::SILGenModule::useConformance(swift::ProtocolConformanceRef) + 173
5  swift                    0x0000000100e0958d swift::Lowering::SILGenModule::emitLazyConformancesForFunction(swift::SILFunction*) + 1277
6  swift                    0x0000000100e5df2e swift::Lowering::SILGenModule::emitProtocolWitness(swift::ProtocolConformanceRef, swift::SILLinkage, swift::IsSerialized_t, swift::SILDeclRef, swift::SILDeclRef, swift::Lowering::IsFreeFunctionWitness_t, swift::Witness) + 2702
7  swift                    0x0000000100e5d426 (anonymous namespace)::SILGenWitnessTable<(anonymous namespace)::SILGenConformance>::addMethod(swift::SILDeclRef) + 902
8  swift                    0x0000000100e5c9dd swift::SILWitnessVisitor<(anonymous namespace)::SILGenConformance>::visitProtocolDecl(swift::ProtocolDecl*) + 1805
9  swift                    0x0000000100e5bf86 swift::Lowering::SILGenModule::getWitnessTable(swift::NormalProtocolConformance*) + 550
10 swift                    0x0000000100e61b68 (anonymous namespace)::SILGenType::emitType() + 6840
11 swift                    0x0000000100d725e2 swift::ASTVisitor<swift::Lowering::SILGenModule, void, void, void, void, void, void>::visit(swift::Decl*) + 82
12 swift                    0x0000000100d717ac swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*) + 1356
13 swift                    0x0000000100d7388a swift::SILModule::constructSIL(swift::ModuleDecl*, swift::Lowering::TypeConverter&, swift::SILOptions&, swift::FileUnit*) + 1530
14 swift                    0x00000001009553cb swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 55595
15 swift                    0x00000001008cb4d3 main + 1283
16 libdyld.dylib            0x00007fff70f5fcc9 start + 1
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.
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@dduan