| Issue |
138428
|
| Summary |
[clang] Crash due to lambdas in decltype (?)
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
dankmeme01
|
Managed to reduce the code to the following:
```cpp
template <typename F>
auto test(F&& f) {}
int main() {
auto _x = []() -> decltype(test([] {})) {};
}
```
```
$ clang++ /tmp/test.cpp
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/llvm/bin/clang-19 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/dankpc/programming/geode3/sdk -fcoverage-compilation-dir=/home/dankpc/programming/geode3/sdk -resource-dir /opt/llvm/lib/clang/19 -internal-isystem /usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15 -internal-isystem /usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/x86_64-redhat-linux -internal-isystem /usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/backward -internal-isystem /opt/llvm/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-redhat-linux/15/../../../../x86_64-redhat-linux/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/test-db0ac7.o -x c++ /tmp/test.cpp
1. /tmp/test.cpp:5:42: current parser token ')'
2. /tmp/test.cpp:4:12: parsing function body 'main'
3. /tmp/test.cpp:4:12: in compound statement ('{}')
4. /tmp/test.cpp:5:15: lambda _expression_ parsing
5. /tmp/test.cpp:2:6: instantiating function definition 'test<(lambda at /tmp/test.cpp:5:37)>'
6. /tmp/test.cpp:2:6: LLVM IR generation of declaration 'test'
7. /tmp/test.cpp:2:6: Mangling declaration 'test'
#0 0x000000000322b3b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/llvm/bin/clang-19+0x322b3b8)
#1 0x0000000003228707 SignalHandler(int) Signals.cpp:0:0
#2 0x00007fc6a6d39c30 __restore_rt (/lib64/libc.so.6+0x19c30)
#3 0x0000000006a4ef44 (anonymous namespace)::CXXNameMangler::mangleFunctionEncoding(clang::GlobalDecl) ItaniumMangle.cpp:0:0
#4 0x0000000006a44521 (anonymous namespace)::CXXNameMangler::mangleLocalName(clang::GlobalDecl, llvm::SmallVector<llvm::StringRef, 4u> const*) ItaniumMangle.cpp:0:0
#5 0x0000000006a4751d (anonymous namespace)::CXXNameMangler::mangleType(clang::QualType) ItaniumMangle.cpp:0:0
#6 0x0000000006a56a20 (anonymous namespace)::CXXNameMangler::mangleTemplateArg(clang::TemplateArgument, bool) ItaniumMangle.cpp:0:0
#7 0x0000000006a53e2d (anonymous namespace)::CXXNameMangler::mangleTemplateArgs(clang::TemplateName, clang::TemplateArgumentList const&) ItaniumMangle.cpp:0:0
#8 0x0000000006a4ed17 (anonymous namespace)::CXXNameMangler::mangleFunctionEncoding(clang::GlobalDecl) ItaniumMangle.cpp:0:0
#9 0x0000000006a51442 (anonymous namespace)::ItaniumMangleContextImpl::mangleCXXName(clang::GlobalDecl, llvm::raw_ostream&) ItaniumMangle.cpp:0:0
#10 0x0000000003617c97 getMangledNameImpl(clang::CodeGen::CodeGenModule&, clang::GlobalDecl, clang::NamedDecl const*, bool) CodeGenModule.cpp:0:0
#11 0x000000000361da24 clang::CodeGen::CodeGenModule::getMangledName(clang::GlobalDecl) (/opt/llvm/bin/clang-19+0x361da24)
#12 0x0000000003639472 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/llvm/bin/clang-19+0x3639472)
#13 0x00000000036429bb clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#14 0x0000000003b2ddf0 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#15 0x0000000003b1ef70 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/llvm/bin/clang-19+0x3b1ef70)
#16 0x0000000006276c90 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/llvm/bin/clang-19+0x6276c90)
#17 0x000000000574f032 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/llvm/bin/clang-19+0x574f032)
#18 0x0000000006104227 clang::Sema::DeduceReturnType(clang::FunctionDecl*, clang::SourceLocation, bool) (/opt/llvm/bin/clang-19+0x6104227)
#19 0x0000000005b1332a clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*, llvm::ArrayRef<clang::SourceLocation>, clang::ObjCInterfaceDecl const*, bool, bool, clang::ObjCInterfaceDecl*, bool) (/opt/llvm/bin/clang-19+0x5b1332a)
#20 0x0000000005f91058 FinishOverloadedCallExpr(clang::Sema&, clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, clang::OverloadCandidateSet*, clang::OverloadCandidate**, clang::OverloadingResult, bool) SemaOverload.cpp:0:0
#21 0x0000000005f92523 clang::Sema::BuildOverloadedCallExpr(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/llvm/bin/clang-19+0x5f92523)
#22 0x0000000005bb6021 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/llvm/bin/clang-19+0x5bb6021)
#23 0x0000000005bb855b clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/llvm/bin/clang-19+0x5bb855b)
#24 0x000000000565785c clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/llvm/bin/clang-19+0x565785c)
#25 0x00000000056502e1 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/llvm/bin/clang-19+0x56502e1)
#26 0x0000000005652b99 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/llvm/bin/clang-19+0x5652b99)
#27 0x0000000005652d5a clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/llvm/bin/clang-19+0x5652d5a)
#28 0x000000000565752e clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/llvm/bin/clang-19+0x565752e)
#29 0x0000000005630c10 clang::Parser::ParseDecltypeSpecifier(clang::DeclSpec&) (/opt/llvm/bin/clang-19+0x5630c10)
#30 0x000000000566dd67 clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&, clang::OpaquePtr<clang::QualType>, bool, bool, bool*, bool, clang::IdentifierInfo const**, bool, bool) (/opt/llvm/bin/clang-19+0x566dd67)
#31 0x00000000055c870c clang::Parser::TryAnnotateCXXScopeToken(bool) (/opt/llvm/bin/clang-19+0x55c870c)
#32 0x000000000561029b clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/llvm/bin/clang-19+0x561029b)
#33 0x00000000056120df clang::Parser::ParseSpecifierQualifierList(clang::DeclSpec&, clang::ImplicitTypenameContext, clang::AccessSpecifier, clang::Parser::DeclSpecContext) (/opt/llvm/bin/clang-19+0x56120df)
#34 0x00000000056125c4 clang::Parser::ParseTypeName(clang::SourceRange*, clang::DeclaratorContext, clang::AccessSpecifier, clang::Decl**, clang::ParsedAttributes*) (/opt/llvm/bin/clang-19+0x56125c4)
#35 0x0000000005673f63 clang::Parser::ParseLambdaExpressionAfterIntroducer(clang::LambdaIntroducer&) (/opt/llvm/bin/clang-19+0x5673f63)
#36 0x0000000005674c0b clang::Parser::ParseLambdaExpression() (/opt/llvm/bin/clang-19+0x5674c0b)
#37 0x000000000565256d clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/llvm/bin/clang-19+0x565256d)
#38 0x0000000005652b99 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/llvm/bin/clang-19+0x5652b99)
#39 0x0000000005652d5a clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/llvm/bin/clang-19+0x5652d5a)
#40 0x000000000560600d clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/llvm/bin/clang-19+0x560600d)
#41 0x000000000561e886 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/llvm/bin/clang-19+0x561e886)
#42 0x00000000056202cf clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/llvm/bin/clang-19+0x56202cf)
#43 0x0000000005620773 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/llvm/bin/clang-19+0x5620773)
#44 0x00000000056d433b clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/llvm/bin/clang-19+0x56d433b)
#45 0x00000000056d4d05 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/llvm/bin/clang-19+0x56d4d05)
#46 0x00000000056d603a clang::Parser::ParseCompoundStatementBody(bool) (/opt/llvm/bin/clang-19+0x56d603a)
#47 0x00000000056d6bf7 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/llvm/bin/clang-19+0x56d6bf7)
#48 0x00000000055cfeb2 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/llvm/bin/clang-19+0x55cfeb2)
#49 0x000000000561ed7f clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/llvm/bin/clang-19+0x561ed7f)
#50 0x00000000055c92b7 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/llvm/bin/clang-19+0x55c92b7)
#51 0x00000000055ca100 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/llvm/bin/clang-19+0x55ca100)
#52 0x00000000055d347d clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/llvm/bin/clang-19+0x55d347d)
#53 0x00000000055d4555 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/llvm/bin/clang-19+0x55d4555)
#54 0x00000000055c328c clang::ParseAST(clang::Sema&, bool, bool) (/opt/llvm/bin/clang-19+0x55c328c)
#55 0x0000000003e009c9 clang::FrontendAction::Execute() (/opt/llvm/bin/clang-19+0x3e009c9)
#56 0x0000000003d7fb32 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/llvm/bin/clang-19+0x3d7fb32)
#57 0x0000000003ed1401 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/llvm/bin/clang-19+0x3ed1401)
#58 0x000000000058e0ad cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/llvm/bin/clang-19+0x58e0ad)
#59 0x0000000000587004 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#60 0x00000000005899cb clang_main(int, char**, llvm::ToolContext const&) (/opt/llvm/bin/clang-19+0x5899cb)
#61 0x000000000044b45f main (/opt/llvm/bin/clang-19+0x44b45f)
#62 0x00007fc6a6d235f5 __libc_start_call_main (/lib64/libc.so.6+0x35f5)
#63 0x00007fc6a6d236a8 __libc_start_main@GLIBC_2.2.5 (/lib64/libc.so.6+0x36a8)
#64 0x0000000000586a45 _start (/opt/llvm/bin/clang-19+0x586a45)
clang++: error: unable to execute command: Segmentation fault (core dumped)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 19.1.7 (https://github.com/llvm/llvm-project.git cd708029e0b2869e80abe31ddb175f7c35361f90)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/llvm/bin
clang++: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/test-43376c.cpp
clang++: note: diagnostic msg: /tmp/test-43376c.sh
clang++: note: diagnostic msg:
********************
```
Compile script:
```
# Crash reproducer for clang version 19.1.7 (https://github.com/llvm/llvm-project.git cd708029e0b2869e80abe31ddb175f7c35361f90)
# Driver args: "--driver-mode=g++" "/tmp/test.cpp"
# Original command: "/opt/llvm/bin/clang-19" "-cc1" "-triple" "x86_64-unknown-linux-gnu" "-emit-obj" "-dumpdir" "a-" "-disable-free" "-clear-ast-before-backend" "-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "test.cpp" "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie" "-mframe-pointer=all" "-fmath-errno" "-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases" "-funwind-tables=2" "-target-cpu" "x86-64" "-tune-cpu" "generic" "-debugger-tuning=gdb" "-fdebug-compilation-dir=/home/dankpc/programming/geode3/sdk" "-fcoverage-compilation-dir=/home/dankpc/programming/geode3/sdk" "-resource-dir" "/opt/llvm/lib/clang/19" "-internal-isystem" "/usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15" "-internal-isystem" "/usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/x86_64-redhat-linux" "-internal-isystem" "/usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/backward" "-internal-isystem" "/opt/llvm/lib/clang/19/include" "-internal-isystem" "/usr/local/include" "-internal-isystem" "/usr/lib/gcc/x86_64-redhat-linux/15/../../../../x86_64-redhat-linux/include" "-internal-externc-isystem" "/include" "-internal-externc-isystem" "/usr/include" "-fdeprecated-macro" "-ferror-limit" "19" "-fgnuc-version=4.2.1" "-fskip-odr-check-in-gmf" "-fcxx-exceptions" "-fexceptions" "-fcolor-diagnostics" "-faddrsig" "-D__GCC_HAVE_DWARF2_CFI_ASM=1" "-o" "/tmp/test-db0ac7.o" "-x" "c++" "/tmp/test.cpp"
"/opt/llvm/bin/clang-19" "-cc1" "-triple" "x86_64-unknown-linux-gnu" "-emit-obj" "-dumpdir" "a-" "-disable-free" "-clear-ast-before-backend" "-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "test.cpp" "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie" "-mframe-pointer=all" "-fmath-errno" "-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases" "-funwind-tables=2" "-target-cpu" "x86-64" "-tune-cpu" "generic" "-debugger-tuning=gdb" "-fdebug-compilation-dir=/home/dankpc/programming/geode3/sdk" "-fcoverage-compilation-dir=/home/dankpc/programming/geode3/sdk" "-fdeprecated-macro" "-ferror-limit" "19" "-fgnuc-version=4.2.1" "-fskip-odr-check-in-gmf" "-fcxx-exceptions" "-fexceptions" "-fcolor-diagnostics" "-faddrsig" "-D__GCC_HAVE_DWARF2_CFI_ASM=1" "-x" "c++" "test-43376c.cpp"
```
Preprocessed source:
```
# 1 "<built-in>"
# 1 "/tmp/test.cpp"
template <typename F>
auto test(F&& f) {}
int main() {
auto _x = []() -> decltype(test([] {})) {};
}
```
Tested this with the latest Clang on godbolt.org (20.1.0) and the crash persists in that version too: https://godbolt.org/z/v7v1oPdxT
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