Clang++ 19.1.6 crash #122417
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clang:frontend
Language frontend issues, e.g. anything involving "Sema"
crash
Prefer [crash-on-valid] or [crash-on-invalid]
Comments
EugeneZelenko
added
clang:frontend
|
@llvm/issue-subscribers-clang-frontend Author: Heiko Lewin (hlewin)
I have run into a compiler crash in a project. I do not have much to say as the project is large and I was moving things around quite a bit, so I cannot correlate the crash to something significant.
Sorry for sharing the requested files per link, but I just cannot upload things here - the web form does not seem to accept cpp or sh files. main-906bec.cpp |
shafik
added
the
needs-reduction
|
Reduced: template <int...>
struct int_sequence {};
template <int>
using element_t = int;
template <class>
void parseRequestVariant()
{
[]<int... index>(int_sequence<index...>) -> void {
(
[] {
using T = element_t<index>;
},
...);
}(int_sequence<0>{});
}
int main()
{
parseRequestVariant<void>();
}Crash happens at different locations for Clang 19 and trunk. Clang 19: https://compiler-explorer.com/z/Kvdo955sE Assertion: clang++: /root/llvm-project/clang/lib/Sema/TreeTransform.h:15248:
clang::ExprResult clang::TreeTransform<Derived>::TransformCXXFoldExpr(clang::CXXFoldExpr*) [with Derived = {anonymous}::TemplateInstantiator; clang::ExprResult = clang::ActionResult<clang::Expr*>]:
Assertion `!Unexpanded.empty() && "Pack expansion without parameter packs?"' failed.Stack dump0. Program arguments: /opt/compiler-explorer/clang-assertions-19.1.0/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-14.2.0 -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 <source>
1. <eof> parser at end of file
2. <source>:8:6: instantiating function definition 'parseRequestVariant<void>'
3. <source>:10:3: instantiating function definition 'parseRequestVariant()::(anonymous class)::operator()<0>'
#0 0x0000000003ae9978 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x3ae9978)
#1 0x0000000003ae766c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x3ae766c)
#2 0x0000000003a308f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007274e9242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007274e92969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007274e9242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007274e92287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007274e922871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007274e9239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x000000000716996b clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCXXFoldExpr(clang::CXXFoldExpr*) SemaTemplateInstantiate.cpp:0:0
#10 0x000000000715bace clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#11 0x000000000719a68f clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*, clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#12 0x000000000719ae44 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#13 0x00000000071a64da clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x71a64da)
#14 0x000000000721c318 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x721c318)
#15 0x000000000721a5bf clang::Sema::PerformPendingInstantiations(bool) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x721a5bf)
#16 0x000000000721bd8c clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x721bd8c)
#17 0x000000000721a5bf clang::Sema::PerformPendingInstantiations(bool) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x721a5bf)
#18 0x000000000666152f clang::Sema::ActOnEndOfTranslationUnitFragment(clang::Sema::TUFragmentKind) (.part.0) Sema.cpp:0:0
#19 0x0000000006661d2a clang::Sema::ActOnEndOfTranslationUnit() (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x6661d2a)
#20 0x00000000064d904a clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x64d904a)
#21 0x00000000064cc33a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x64cc33a)
#22 0x00000000043f9448 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x43f9448)
#23 0x0000000004684f59 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x4684f59)
#24 0x0000000004609f8e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x4609f8e)
#25 0x000000000476e2be clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x476e2be)
#26 0x0000000000c82b7f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0xc82b7f)
#27 0x0000000000c7bcda ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#28 0x000000000443cba9 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#29 0x0000000003a30da4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x3a30da4)
#30 0x000000000443d19f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#31 0x0000000004402c05 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x4402c05)
#32 0x000000000440366d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x440366d)
#33 0x000000000440b075 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0x440b075)
#34 0x0000000000c7fe95 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0xc7fe95)
#35 0x0000000000b547a4 main (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0xb547a4)
#36 0x00007274e9229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#37 0x00007274e9229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#38 0x0000000000c7b78e _start (/opt/compiler-explorer/clang-assertions-19.1.0/bin/clang+++0xc7b78e)Clang trunk: https://compiler-explorer.com/z/4o43bnPnh Assertion: clang++: /root/llvm-project/clang/lib/AST/ExprCXX.cpp:1960:
clang::CXXFoldExpr::CXXFoldExpr(clang::QualType, clang::UnresolvedLookupExpr*, clang::SourceLocation, clang::Expr*, clang::BinaryOperatorKind, clang::SourceLocation, clang::Expr*, clang::SourceLocation, std::optional<unsigned int>):
Assertion `((LHS && LHS->containsUnexpandedParameterPack()) != (RHS && RHS->containsUnexpandedParameterPack())) && "Exactly one of LHS or RHS should contain an unexpanded pack"' failed.Stack dump0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 <source>
1. <eof> parser at end of file
2. <source>:8:6: instantiating function definition 'parseRequestVariant<void>'
#0 0x0000000003c9d748 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c9d748)
#1 0x0000000003c9b454 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c9b454)
#2 0x0000000003be7fa8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000072c07ae42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000072c07ae969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000072c07ae42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000072c07ae287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000072c07ae2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000072c07ae39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x000000000785fc93 clang::CXXFoldExpr::CXXFoldExpr(clang::QualType, clang::UnresolvedLookupExpr*, clang::SourceLocation, clang::Expr*, clang::BinaryOperatorKind, clang::SourceLocation, clang::Expr*, clang::SourceLocation, std::optional<unsigned int>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x785fc93)
#10 0x000000000722dde7 clang::Sema::BuildCXXFoldExpr(clang::UnresolvedLookupExpr*, clang::SourceLocation, clang::Expr*, clang::BinaryOperatorKind, clang::SourceLocation, clang::Expr*, clang::SourceLocation, std::optional<unsigned int>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x722dde7)
#11 0x000000000717e266 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCXXFoldExpr(clang::CXXFoldExpr*) SemaTemplateInstantiate.cpp:0:0
#12 0x000000000716b729 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#13 0x0000000007199557 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*, clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#14 0x000000000719a13e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#15 0x000000000716aaa6 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformLambdaExpr(clang::LambdaExpr*) SemaTemplateInstantiate.cpp:0:0
#16 0x000000000716bffe clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#17 0x000000000717d236 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#18 0x000000000716b814 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#19 0x0000000007199557 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*, clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#20 0x000000000719a13e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#21 0x00000000071a2f14 clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x71a2f14)
#22 0x000000000721ac07 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x721ac07)
#23 0x0000000007218d5f clang::Sema::PerformPendingInstantiations(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7218d5f)
#24 0x00000000067e814d clang::Sema::ActOnEndOfTranslationUnitFragment(clang::Sema::TUFragmentKind) (.part.0) Sema.cpp:0:0
#25 0x00000000067e8942 clang::Sema::ActOnEndOfTranslationUnit() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e8942)
#26 0x000000000665488b clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x665488b)
#27 0x0000000006646c0a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6646c0a)
#28 0x000000000462c428 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x462c428)
#29 0x00000000048ecd85 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48ecd85)
#30 0x000000000486f42e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x486f42e)
#31 0x00000000049da31e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x49da31e)
#32 0x0000000000cf07ff cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcf07ff)
#33 0x0000000000ce82da ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#34 0x0000000004672039 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#35 0x0000000003be8454 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be8454)
#36 0x000000000467262f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#37 0x000000000463615d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x463615d)
#38 0x00000000046371de clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x46371de)
#39 0x000000000463e945 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x463e945)
#40 0x0000000000ced633 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xced633)
#41 0x0000000000bb8be4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb8be4)
#42 0x000072c07ae29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#43 0x000072c07ae29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#44 0x0000000000ce7d85 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce7d85) |
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Jan 20, 2025
… up to lambda (#122875) We should have been checking desugar() for the type of the right-hand side of a typedef declaration, instead of using getCanonicalType(), which points to the end of the type alias chain. Fixes llvm/llvm-project#122417
EugeneZelenko
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needs-reduction
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I have run into a compiler crash in a project. I do not have much to say as the project is large and I was moving things around quite a bit, so I cannot correlate the crash to something significant.
Sorry for sharing the requested files per link, but I just cannot upload things here - the web form does not seem to accept cpp or sh files.
(Links removed - use reduced form)
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