Compiler crash while emitting IR SIL function for Swift Macro

[mgutski]

Description

When building in release configuration, the compiler crashes with segmentation fault (signal 11) while emitting IR SIL function "@$s21ConfidentialKitMacros15ObfuscatedMacroO9expansion2of16providingPeersOf2inSay11SwiftSyntax04DeclM0VGAH09AttributeM0V_xq_tKAH0nM8ProtocolRz0lmC00E16ExpansionContextR_r0_lFZTf4nndd_n" .

The crash happens when compiling the @Obfuscated macro from the _ConfidentialKit library in the swift-confidential package.

The compilation succeeds when building in debug configuration.

Tested with Xcode 16.2 (swiftlang-6.0.3.1.10) and Xcode 16.3 Beta 2 (swiftlang-6.1.0.109.103) on macOS (arm64 and x86_64).

Reproduction

1. Clone the swift-confidential repository.

   git clone https://github.com/securevale/swift-confidential.git && cd swift-confidential

2. Checkout the topic/swift-6-support branch.

   git checkout topic/swift-6-support

3. Build the library target _ConfidentialKit in release configuration.

   swift build --target _ConfidentialKit --configuration release

Stack dump

0  swift-frontend           0x000000010711ee14 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x000000010711cc4c llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x000000010711f450 SignalHandler(int) + 360
3  libsystem_platform.dylib 0x00000001917f2de4 _sigtramp + 56
4  swift-frontend           0x00000001016862d8 swift::irgen::ElementLayout::project(swift::irgen::IRGenFunction&, swift::irgen::Address, std::__1::optional<swift::irgen::NonFixedOffsetsImpl*>, llvm::Twine const&) const + 1236
5  swift-frontend           0x00000001015418a0 swift::irgen::RecordTypeInfo<(anonymous namespace)::LoadableStructTypeInfo, swift::irgen::LoadableTypeInfo, (anonymous namespace)::StructFieldInfo, true, true>::initialize(swift::irgen::IRGenFunction&, swift::irgen::Explosion&, swift::irgen::Address, bool) const + 160
6  swift-frontend           0x00000001015ee07c (anonymous namespace)::IRGenSILFunction::visitSILBasicBlock(swift::SILBasicBlock*) + 75332
7  swift-frontend           0x00000001015da32c (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 15860
8  swift-frontend           0x00000001015d6080 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 2788
9  swift-frontend           0x00000001013fb93c swift::irgen::IRGenerator::emitLazyDefinitions() + 5288
10 swift-frontend           0x000000010158986c swift::performIRGeneration(swift::ModuleDecl*, swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, llvm::GlobalVariable**) + 2736
11 swift-frontend           0x0000000100f75ac4 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>>>) + 216
12 swift-frontend           0x0000000100f71014 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*) + 2108
13 swift-frontend           0x0000000100f706b4 swift::performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 2688
14 swift-frontend           0x0000000100f735ec performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1764
15 swift-frontend           0x0000000100f71f70 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 3716
16 swift-frontend           0x0000000100ef6054 swift::mainEntry(int, char const**) + 5428
17 dyld                     0x000000019143c274 start + 2840

Expected behavior

The compilation succeeds, regardless of the selected build configuration.

Environment

swift-driver version: 1.120.5 Apple Swift version 6.1 (swiftlang-6.1.0.109.103 clang-1700.0.13.2)
Target: arm64-apple-macosx15.0

Additional information

No response