<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/59447>59447</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
Clang crashes with consteval in front-end
</td>
</tr>
<tr>
<th>Labels</th>
<td>
new issue
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
magiruuvelvet
</td>
</tr>
</table>
<pre>
```
# clang -v
clang version 15.0.6
Target: x86_64-pc-linux
Thread model: posix
InstalledDir: /usr/lib/llvm/current/bin
Configuration file: /etc/clang/clang.cfg
System configuration file directory: /etc/clang
```
Note: I self-hosted my LLVM version compiled with itself. The first stage was built using LLVM 11.0.1, which was my previous installed version.
```
# readelf --string-dump=.comment (which clang)
File: /usr/lib/llvm/current/bin/clang
Format: elf64-x86-64
Arch: x86_64
AddressSize: 64bit
LoadName: <Not found>
String dump of section '.comment':
[ 1] Linker: LLD 15.0.6
[ 14] clang version 15.0.6
```
I followed the instructions at https://llvm.org/docs/HowToSubmitABug.html
1. normal compiler invocation crashes
2. adding `-emit-llvm -Xclang -disable-llvm-passes` to the compiler arguments still crashed
3. just `-emit-llvm` didn't crash
4. `opt -O3 foo.bc -disable-output` didn't crash either
5. compiling the produced source file using the run script file still crashes (from step 1)
Stack trace with `-march=native` (Intel Haswell) and `-O3`:
<details>
```
1. <eof> parser at end of file
#0 0x00007fdf10358a33 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1e38a33)
#1 0x00007fdf10356bd0 llvm::sys::RunSignalHandlers() (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1e36bd0)
#2 0x00007fdf10358eda SignalHandler(int) Signals.cpp:0:0
#3 0x00007fdf0e0e28f0 __restore_rt sigaction.c:0:0
#4 0x00007fdf122a6dd2 llvm::X86TTIImpl::areInlineCompatible(llvm::Function const*, llvm::Function const*) const X86TargetTransformInfo.cpp:0:0
#5 0x00007fdf116621e5 llvm::getAttributeBasedInliningDecision(llvm::CallBase&, llvm::Function*, llvm::TargetTransformInfo&, llvm::function_ref<llvm::TargetLibraryInfo const& (llvm::Function&)>) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x31421e5)
#6 0x00007fdf1167121a llvm::InlineAdvisor::getAdvice(llvm::CallBase&, bool) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x315121a)
#7 0x00007fdf1137e725 llvm::InlinerPass::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x2e5e725)
#8 0x00007fdf113833dd llvm::detail::PassModel<llvm::LazyCallGraph::SCC, llvm::InlinerPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) Inliner.cpp:0:0
#9 0x00007fdf115d7d14 llvm::PassManager<llvm::LazyCallGraph::SCC, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x30b7d14)
#10 0x00007fdf113837dd llvm::detail::PassModel<llvm::LazyCallGraph::SCC, llvm::PassManager<llvm::LazyCallGraph::SCC, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) Inliner.cpp:0:0
#11 0x00007fdf115d9d94 llvm::DevirtSCCRepeatedPass::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x30b9d94)
#12 0x00007fdf11383e3d llvm::detail::PassModel<llvm::LazyCallGraph::SCC, llvm::DevirtSCCRepeatedPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) Inliner.cpp:0:0
#13 0x00007fdf115d92f5 llvm::ModuleToPostOrderCGSCCPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x30b92f5)
#14 0x00007fdf11383c5d llvm::detail::PassModel<llvm::Module, llvm::ModuleToPostOrderCGSCCPassAdaptor, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) Inliner.cpp:0:0
#15 0x00007fdf104d2c4a llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1fb2c4a)
#16 0x00007fdf1138044c llvm::ModuleInlinerWrapperPass::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x2e6044c)
#17 0x00007fdf125df74d llvm::detail::PassModel<llvm::Module, llvm::ModuleInlinerWrapperPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) PassBuilder.cpp:0:0
#18 0x00007fdf104d2c4a llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1fb2c4a)
#19 0x00007fdf14e159f0 (anonymous namespace)::EmitAssemblyHelper::RunOptimizationPipeline(clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream>>&, std::__1::unique_ptr<llvm::ToolOutputFile, std::__1::default_delete<llvm::ToolOutputFile>>&) BackendUtil.cpp:0:0
#20 0x00007fdf14e0e7a4 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream>>) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x23ff7a4)
#21 0x00007fdf15131300 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) CodeGenAction.cpp:0:0
#22 0x00007fdf13fdc424 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x15cd424)
#23 0x00007fdf15a0579f clang::FrontendAction::Execute() (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2ff679f)
#24 0x00007fdf15989fb6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2f7afb6)
#25 0x00007fdf15a78692 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x3069692)
#26 0x000055ec8c7d567b cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm/15/bin/clang-15+0x1567b)
#27 0x000055ec8c7d3401 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#28 0x000055ec8c7d2ef6 clang_main(int, char**) (/usr/lib/llvm/15/bin/clang-15+0x12ef6)
#29 0x00007fdf0e0cd7ed __libc_start_main (/lib64/libc.so.6+0x2017ed)
#30 0x000055ec8c7d001a _start (/usr/lib/llvm/15/bin/clang-15+0x1001a)
```
</details>
Stack trace without `-march` flag and `-O0`:
<details>
```
1. <eof> parser at end of file
2. Per-file LLVM IR generation
3. /usr/include/c++/v1/__memory/allocate_at_least.h:53:65: Generating code for declaration 'std::__allocate_at_least'
#0 0x00007f3938410a33 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1e38a33)
#1 0x00007f393840ebd0 llvm::sys::RunSignalHandlers() (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1e36bd0)
#2 0x00007f3938335066 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f393619a8f0 __restore_rt sigaction.c:0:0
#4 0x00007f39361e66a9 _int_malloc malloc.c:0:0
#5 0x00007f39361e7aa2 _int_realloc malloc.c:0:0
#6 0x00007f39361e8d32 __libc_realloc (/lib64/libc.so.6+0x264d32)
#7 0x00007f39383a0420 llvm::SmallVectorBase<unsigned int>::grow_pod(void*, unsigned long, unsigned long) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1dc8420)
#8 0x00007f393834c8b2 llvm::BumpPtrAllocatorImpl<llvm::MallocAllocator, 4096ul, 4096ul, 128ul>::Allocate(unsigned long, llvm::Align) FoldingSet.cpp:0:0
#9 0x00007f3938439b7a llvm::AttributeList::getImpl(llvm::LLVMContext&, llvm::ArrayRef<llvm::AttributeSet>) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1e61b7a)
#10 0x00007f393843ab68 llvm::AttributeList::setAttributesAtIndex(llvm::LLVMContext&, unsigned int, llvm::AttributeSet) const (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1e62b68)
#11 0x00007f393843ad59 llvm::AttributeList::addAttributesAtIndex(llvm::LLVMContext&, unsigned int, llvm::AttrBuilder const&) const (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1e62d59)
#12 0x00007f3938519a1b llvm::Function::addFnAttrs(llvm::AttrBuilder const&) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1f41a1b)
#13 0x00007f393d2071dc clang::CodeGen::CodeGenModule::SetLLVMFunctionAttributesForDefinition(clang::Decl const*, llvm::Function*) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x27401dc)
#14 0x00007f393d211876 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x274a876)
#15 0x00007f393d20b29d clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x274429d)
#16 0x00007f393d1fff0b clang::CodeGen::CodeGenModule::EmitDeferred() (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2738f0b)
#17 0x00007f393d1ffe68 clang::CodeGen::CodeGenModule::EmitDeferred() (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2738e68)
#18 0x00007f393d1ffe68 clang::CodeGen::CodeGenModule::EmitDeferred() (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2738e68)
#19 0x00007f393d1ffe68 clang::CodeGen::CodeGenModule::EmitDeferred() (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2738e68)
#20 0x00007f393d1fe10e clang::CodeGen::CodeGenModule::Release() (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x273710e)
#21 0x00007f393d299994 (anonymous namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&) ModuleBuilder.cpp:0:0
#22 0x00007f393d1e8c39 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) CodeGenAction.cpp:0:0
#23 0x00007f393c094424 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x15cd424)
#24 0x00007f393dabd79f clang::FrontendAction::Execute() (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2ff679f)
#25 0x00007f393da41fb6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2f7afb6)
#26 0x00007f393db30692 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x3069692)
#27 0x0000564439ec567b cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm/current/bin/clang+++0x1567b)
#28 0x0000564439ec3401 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#29 0x00007f393d71a962 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>*, bool*) const::$_1>(long) Job.cpp:0:0
#30 0x00007f3938334daf llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib/llvm/15/bin/../lib64/libLLVM-15libcxx.so+0x1d5cdaf)
#31 0x00007f393d71a433 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>*, bool*) const (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2c53433)
#32 0x00007f393d6e45d7 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2c1d5d7)
#33 0x00007f393d6e48de clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*>>&, bool) const (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2c1d8de)
#34 0x00007f393d6fd55c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*>>&) (/usr/lib/llvm/15/bin/../lib64/libclang-cpp.so.15libcxx+0x2c3655c)
#35 0x0000564439ec2b60 clang_main(int, char**) (/usr/lib/llvm/current/bin/clang+++0x12b60)
#36 0x00007f39361857ed __libc_start_main (/lib64/libc.so.6+0x2017ed)
#37 0x0000564439ec001a _start (/usr/lib/llvm/current/bin/clang+++0x1001a)
```
</details>
My only guess is `consteval`. Replacing all instances with `constexpr` makes the crash go away.
I found the crash attempting to compile this project: https://github.com/RPCS3/rpcs3.git `0d929a210f33ea8fe18dcc3aa5291a9544b29cfc`
The file https://github.com/RPCS3/rpcs3/blob/0d929a210f33ea8fe18dcc3aa5291a9544b29cfc/rpcs3/Loader/TRP.cpp is reliable to reproduce the crash on my system.
The included header file with the possible crashing `consteval` -> https://github.com/RPCS3/rpcs3/blob/0d929a210f33ea8fe18dcc3aa5291a9544b29cfc/rpcs3/util/types.hpp#L118 \(search for `__INTELLISENSE__`, about line 118\). Enabling `#define consteval constexpr` makes the crash go away. I couldn't test yet if the application still works as intended with this change.
cpp and script files: [crash.zip](https://github.com/llvm/llvm-project/files/10203057/crash.zip)
</pre>
<img width="1px" height="1px" alt="" 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