<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ICE produced by invokation of c++2a-style templated lambda"
href="https://bugs.llvm.org/show_bug.cgi?id=43022">43022</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ICE produced by invokation of c++2a-style templated lambda
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++2a
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>l.lehning@web.de
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22384" name="attach_22384" title="Problematic code snippet">attachment 22384</a> <a href="attachment.cgi?id=22384&action=edit" title="Problematic code snippet">[details]</a></span>
Problematic code snippet
I've encountered a segmentation fault in clang trying to implement a compile
time type iteration higher order function using the c++2a lambda extensions to
pass the type and index of the type in the tuple.
The problematic code is attached as a picture for better readability and the
stacktrace is below:
Stack dump:
0. Program arguments:
/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10 -cc1 -triple
x86_64-unknown-linux-gnu -S -disable-free -disable-llvm-verifier
-discard-value-names -main-file-name example.cpp -mrelocation-model static
-mthread-model posix -mframe-pointer=none -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-dwarf-column-info -debug-info-kind=limited -dwarf-version=4
-debugger-tuning=gdb -coverage-notes-file /home/ubuntu/./output.gcno
-resource-dir /opt/compiler-explorer/clang-trunk-20190816/lib/clang/10.0.0
-internal-isystem
/opt/compiler-explorer/clang-trunk-20190816/bin/../include/c++/v1
-internal-isystem /usr/local/include -internal-isystem
/opt/compiler-explorer/clang-trunk-20190816/lib/clang/10.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O3
--std=c++2a -fdeprecated-macro -fdebug-compilation-dir /home/ubuntu
-ferror-limit 19 -fmessage-length 0 -fno-implicit-modules -fobjc-runtime=gcc
-fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics
-vectorize-loops -vectorize-slp -mllvm --x86-asm-syntax=intel -faddrsig -o
./output.s -x c++ <source>
1. <source>:20:6: current parser token ')'
2. <source>:17:20: parsing function body 'main'
3. <source>:17:20: in compound statement ('{}')
4. <source>:8:16: instantiating function definition 'enum_tuple<int, bool,
char, (lambda at <source>:18:33)>'
5. <source>:12:12: instantiating function definition 'enum_tuple((lambda
at <source>:18:33) &&)::(anonymous class)::operator()<0, 1, 2>'
6. <source>:18:33: instantiating class definition ''
#0 0x000056211bd729da llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x28339da)
#1 0x000056211bd70774 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x2831774)
#2 0x000056211bd708b2 SignalHandler(int)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x28318b2)
#3 0x00007faf64b72890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x000056211d974d71
clang::Sema::SubstFunctionDeclType(clang::TypeSourceInfo*,
clang::MultiLevelTemplateArgumentList const&, clang::SourceLocation,
clang::DeclarationName, clang::CXXRecordDecl*, clang::Qualifiers)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4435d71)
#5 0x000056211d984454
clang::TemplateDeclInstantiator::SubstFunctionType(clang::FunctionDecl*,
llvm::SmallVectorImpl<clang::ParmVarDecl*>&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4445454)
#6 0x000056211d9959b7
clang::TemplateDeclInstantiator::VisitCXXMethodDecl(clang::CXXMethodDecl*,
clang::TemplateParameterList*,
llvm::Optional<clang::ASTTemplateArgumentListInfo const*>)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x44569b7)
#7 0x000056211d96dea1 clang::Sema::InstantiateClass(clang::SourceLocation,
clang::CXXRecordDecl*, clang::CXXRecordDecl*,
clang::MultiLevelTemplateArgumentList const&,
clang::TemplateSpecializationKind, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x442eea1)
#8 0x000056211d992592
clang::TemplateDeclInstantiator::VisitCXXRecordDecl(clang::CXXRecordDecl*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4453592)
#9 0x000056211d992b4d clang::Sema::SubstDecl(clang::Decl*,
clang::DeclContext*, clang::MultiLevelTemplateArgumentList const&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4453b4d)
#10 0x000056211d98c62b clang::Sema::FindInstantiatedDecl(clang::SourceLocation,
clang::NamedDecl*, clang::MultiLevelTemplateArgumentList const&, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x444d62b)
#11 0x000056211d9501db (anonymous
namespace)::TemplateInstantiator::TransformDecl(clang::SourceLocation,
clang::Decl*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x44111db)
#12 0x000056211d9710f4 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformUnresolvedMemberExpr(clang::UnresolvedMemberExpr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x44320f4)
#13 0x000056211d95bdcb clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x441cdcb)
#14 0x000056211d961360 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4422360)
#15 0x000056211d95ba5b clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x441ca5b)
#16 0x000056211d9797a2 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCXXNamedCastExpr(clang::CXXNamedCastExpr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x443a7a2)
#17 0x000056211d95bac9 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x441cac9)
#18 0x000056211d960f00 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCXXFoldExpr(clang::CXXFoldExpr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4421f00)
#19 0x000056211d95b980 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x441c980)
#20 0x000056211d97c1b0 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*,
clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::StmtDiscardKind)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x443d1b0)
#21 0x000056211d980ab0 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4441ab0)
#22 0x000056211d9809ba clang::Sema::SubstStmt(clang::Stmt*,
clang::MultiLevelTemplateArgumentList const&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x44419ba)
#23 0x000056211d99508c
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x445608c)
#24 0x000056211d91d959 clang::Sema::DeduceReturnType(clang::FunctionDecl*,
clang::SourceLocation, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x43de959)
#25 0x000056211d650b1a clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*,
llvm::ArrayRef<clang::SourceLocation>, clang::ObjCInterfaceDecl const*, bool,
bool, clang::ObjCInterfaceDecl*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4111b1a)
#26 0x000056211d81166f CreateFunctionRefExpr(clang::Sema&,
clang::FunctionDecl*, clang::NamedDecl*, clang::Expr const*, bool,
clang::SourceLocation, clang::DeclarationNameLoc const&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x42d266f)
#27 0x000056211d8437e7 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*,
clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x43047e7)
#28 0x000056211d67c5bb clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x413d5bb)
#29 0x000056211d961434 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4422434)
#30 0x000056211d95ba5b clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x441ca5b)
#31 0x000056211d95c82b clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformInitializer(clang::Expr*, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x441d82b)
#32 0x000056211d95d8f7 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformReturnStmt(clang::ReturnStmt*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x441e8f7)
#33 0x000056211d980ab0 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4441ab0)
#34 0x000056211d9809ba clang::Sema::SubstStmt(clang::Stmt*,
clang::MultiLevelTemplateArgumentList const&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x44419ba)
#35 0x000056211d99508c
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x445608c)
#36 0x000056211d67368c
clang::Sema::MarkFunctionReferenced(clang::SourceLocation,
clang::FunctionDecl*, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x413468c)
#37 0x000056211d674080 clang::Sema::MarkDeclRefReferenced(clang::DeclRefExpr*,
clang::Expr const*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4135080)
#38 0x000056211d67428d clang::Sema::BuildDeclRefExpr(clang::ValueDecl*,
clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&,
clang::NestedNameSpecifierLoc, clang::NamedDecl*, clang::SourceLocation,
clang::TemplateArgumentListInfo const*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x413528d)
#39 0x000056211d81dede
clang::Sema::FixOverloadedFunctionReference(clang::Expr*,
clang::DeclAccessPair, clang::FunctionDecl*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x42deede)
#40 0x000056211d840229 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)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x4301229)
#41 0x000056211d84061f clang::Sema::BuildOverloadedCallExpr(clang::Scope*,
clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation,
llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool,
bool) (/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x430161f)
#42 0x000056211d67c1b8 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x413d1b8)
#43 0x000056211d67d112 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x413e112)
#44 0x000056211d34c93f
clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*,
true>) (/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e0d93f)
#45 0x000056211d34760f clang::Parser::ParseCastExpression(bool, bool, bool&,
clang::Parser::TypeCastState, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e0860f)
#46 0x000056211d349b04 clang::Parser::ParseCastExpression(bool, bool,
clang::Parser::TypeCastState, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e0ab04)
#47 0x000056211d34acb1
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e0bcb1)
#48 0x000056211d34b929
clang::Parser::ParseExpression(clang::Parser::TypeCastState)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e0c929)
#49 0x000056211d39675d
clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e5775d)
#50 0x000056211d3940d2
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e550d2)
#51 0x000056211d395939
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e56939)
#52 0x000056211d390901 clang::Parser::ParseCompoundStatementBody(bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e51901)
#53 0x000056211d39b913 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3e5c913)
#54 0x000056211d306dd8
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3dc7dd8)
#55 0x000056211d3295d0 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3dea5d0)
#56 0x000056211d3021f9
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3dc31f9)
#57 0x000056211d302ed1
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.206)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3dc3ed1)
#58 0x000056211d309c16
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3dcac16)
#59 0x000056211d30a679
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3dcb679)
#60 0x000056211d2fe339 clang::ParseAST(clang::Sema&, bool, bool)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x3dbf339)
#61 0x000056211cae9322 clang::CodeGenAction::ExecuteAction()
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x35aa322)
#62 0x000056211c451439 clang::FrontendAction::Execute()
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x2f12439)
#63 0x000056211c4148d5
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x2ed58d5)
#64 0x000056211c516ae3
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0x2fd7ae3)
#65 0x000056211a26ff80 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0xd30f80)
#66 0x000056211a1cc2ba main
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0xc8d2ba)
#67 0x00007faf63a30b97 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21b97)
#68 0x000056211a26d61a _start
(/opt/compiler-explorer/clang-trunk-20190816/bin/clang-10+0xd2e61a)
clang-10: error: unable to execute command: Segmentation fault (core dumped)
clang-10: error: clang frontend command failed due to signal (use -v to see
invocation)
The compiler returned with status code 254.</pre>
</div>
</p>
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