| Issue |
184003
|
| Summary |
[DebugInfo] Segfault in `DwarfCompileUnit` with empty struct types
|
| Labels |
debuginfo,
crash-on-valid
|
| Assignees |
|
| Reporter |
MacDue
|
```llvm
define void @test_empty_struct_debug() !dbg !4 {
entry:
%tmp = alloca { { i1, {} }, ptr, { { {} }, { {} } }, i64 }, align 8
#dbg_value({ { {} }, { {} } } zeroinitializer, !5, !DIExpression(), !6)
#dbg_value(i64 2, !7, !DIExpression(), !6)
%0 = insertvalue { { i1, {} }, ptr, { { {} }, { {} } }, i64 } { { i1, {} } zeroinitializer, ptr null, { { {} }, { {} } } zeroinitializer, i64 2 }, ptr null, 1, !dbg !6
%1 = insertvalue { { i1, {} }, ptr, { { {} }, { {} } }, i64 } %0, { i1, {} } zeroinitializer, 0, !dbg !8
store { { i1, {} }, ptr, { { {} }, { {} } }, i64 } %1, ptr %tmp, align 8
ret void
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3}
!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly)
!1 = !DIFile(filename: "test_selectiondag.cpp", directory: "/home/AnonTokyo/documents/llvm-project/temp")
!2 = !{i32 2, !"Debug Info Version", i32 3}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = distinct !DISubprogram(name: "test_empty_struct_debug", scope: !1, file: !1, line: 1, scopeLine: 1, spFlags: DISPFlagDefinition, unit: !0)
!5 = !DILocalVariable(name: "v1", scope: !4, file: !1, line: 2)
!6 = !DILocation(line: 2, column: 1, scope: !4)
!7 = !DILocalVariable(name: "v2", scope: !4, file: !1, line: 3)
!8 = !DILocation(line: 3, column: 1, scope: !4)
```
<details>
<summary>Stack trace</summary>
<pre>
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel -mtriple=x86_64-apple-darwin <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'X86 Assembly Printer' on function '@test_empty_struct_debug'
#0 0x0000000003e262e8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3e262e8)
#1 0x0000000003e23424 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x0000726367642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x0000000002b03fb5 llvm::DwarfCompileUnit::constructSubprogramScopeDIE(llvm::DISubprogram const*, llvm::Function const&, llvm::LexicalScope*, llvm::MCSymbol*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x2b03fb5)
#4 0x0000000002b2ef4a llvm::DwarfDebug::endFunctionImpl(llvm::MachineFunction const*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x2b2ef4a)
#5 0x0000000002aebd6b llvm::DebugHandlerBase::endFunction(llvm::MachineFunction const*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x2aebd6b)
#6 0x0000000002ae49a2 llvm::AsmPrinter::emitFunctionBody() (/opt/compiler-explorer/clang-trunk/bin/llc+0x2ae49a2)
#7 0x0000000001ff4263 llvm::X86AsmPrinter::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x1ff4263)
#8 0x0000000002d883dd llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x2d883dd)
#9 0x00000000032e9672 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x32e9672)
#10 0x00000000032e9901 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x32e9901)
#11 0x00000000032eb177 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x32eb177)
#12 0x00000000008fd75f compileModule(char**, llvm::SmallVectorImpl<llvm::PassPlugin>&, llvm::LLVMContext&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&) llc.cpp:0:0
#13 0x00000000007cc14c main (/opt/compiler-explorer/clang-trunk/bin/llc+0x7cc14c)
#14 0x0000726367629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#15 0x0000726367629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#16 0x00000000008f3cc5 _start (/opt/compiler-explorer/clang-trunk/bin/llc+0x8f3cc5)
Program terminated with signal: SIGSEGV
Compiler returned: 139
</pre>
</details>
Compiler Explorer: https://godbolt.org/z/T1aqGhW44
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