[llvm-bugs] [Bug 49388] New: Crash with template lambda and std::index_sequence

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Mon Mar 1 19:02:51 PST 2021 

https://bugs.llvm.org/show_bug.cgi?id=49388

            Bug ID: 49388
           Summary: Crash with template lambda and std::index_sequence
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: vittorio.romeo at outlook.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Closely related to #49387. The following code:

#include <utility>

struct S 
{
    template <int> using N = int;
    static constexpr int size = 5;
};

template <typename>
static void f()
{
    const auto l = [&]<typename>() {};

    [&]<std::size_t... Is>(std::index_sequence<Is...>)
    {
        ((l
                 .template operator()<typename S::template N<Is>>()),
            ...);
    }
    (std::make_index_sequence<S::size> {});
}

int main()
{
    f<int>();
}

Results in a compiler crash:

PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang++ -g -o
./output.s -mllvm --x86-asm-syntax=intel -S
--gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics
-fno-crash-diagnostics -isystem/opt/compiler-explorer/libs/boost_1_64_0
-std=c++2a -stdlib=libc++ -Wall -Wextra -Wpedantic <source>
1.      <eof> parser at end of file
2.      <source>:10:13: instantiating function definition 'f<int>'
3.      <source>:14:5: instantiating function definition 'f()::(anonymous
class)::operator()<0, 1, 2, 3, 4>'
 #0 0x0000559a3b737bbc llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3056bbc)
 #1 0x0000559a3b735964 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3054964)
 #2 0x0000559a3b735be5 llvm::sys::CleanupOnSignal(unsigned long)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3054be5)
 #3 0x0000559a3b69c408 CrashRecoverySignalHandler(int)
CrashRecoveryContext.cpp:0:0
 #4 0x00007fcff457c3c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
 #5 0x0000559a3e078ca4 clang::TemplateArgument::isPackExpansion() const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x5997ca4)
 #6 0x0000559a3db62c0d
clang::Sema::collectUnexpandedParameterPacks(clang::TemplateArgument,
llvm::SmallVectorImpl<std::pair<llvm::PointerUnion<clang::TemplateTypeParmType
const*, clang::NamedDecl*>, clang::SourceLocation> >&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x5481c0d)
 #7 0x0000559a3db06d30 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCXXFoldExpr(clang::CXXFoldExpr*)
SemaTemplateInstantiate.cpp:0:0
 #8 0x0000559a3db009d8 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
SemaTemplateInstantiate.cpp:0:0
 #9 0x0000559a3db27320 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*,
clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::StmtDiscardKind)
SemaTemplateInstantiate.cpp:0:0
#10 0x0000559a3db2c24d clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*)
SemaTemplateInstantiate.cpp:0:0
#11 0x0000559a3db2c14a clang::Sema::SubstStmt(clang::Stmt*,
clang::MultiLevelTemplateArgumentList const&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x544b14a)
#12 0x0000559a3db3f1d4
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x545e1d4)
#13 0x0000559a3d486d4f
clang::Sema::runWithSufficientStackSpace(clang::SourceLocation,
llvm::function_ref<void ()>)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x4da5d4f)
#14 0x0000559a3da9ffcd clang::Sema::DeduceReturnType(clang::FunctionDecl*,
clang::SourceLocation, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x53befcd)
#15 0x0000559a3d71c3ef clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*,
llvm::ArrayRef<clang::SourceLocation>, clang::ObjCInterfaceDecl const*, bool,
bool, clang::ObjCInterfaceDecl*)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x503b3ef)
#16 0x0000559a3d97bc8f CreateFunctionRefExpr(clang::Sema&,
clang::FunctionDecl*, clang::NamedDecl*, clang::Expr const*, bool,
clang::SourceLocation, clang::DeclarationNameLoc const&) SemaOverload.cpp:0:0
#17 0x0000559a3d9b37bf clang::Sema::BuildCallToObjectOfClassType(clang::Scope*,
clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x52d27bf)
#18 0x0000559a3d7527a2 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*, bool, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x50717a2)
#19 0x0000559a3d753374 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x5072374)
#20 0x0000559a3db07b5d clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*)
SemaTemplateInstantiate.cpp:0:0
#21 0x0000559a3db00abd clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*)
SemaTemplateInstantiate.cpp:0:0
#22 0x0000559a3db27320 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*,
clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::StmtDiscardKind)
SemaTemplateInstantiate.cpp:0:0
#23 0x0000559a3db2c24d clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*)
SemaTemplateInstantiate.cpp:0:0
#24 0x0000559a3db2c14a clang::Sema::SubstStmt(clang::Stmt*,
clang::MultiLevelTemplateArgumentList const&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x544b14a)
#25 0x0000559a3db3f1d4
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x545e1d4)
#26 0x0000559a3db3e342 clang::Sema::PerformPendingInstantiations(bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x545d342)
#27 0x0000559a3d49e8d9
clang::Sema::ActOnEndOfTranslationUnitFragment(clang::Sema::TUFragmentKind)
(.part.1373) Sema.cpp:0:0
#28 0x0000559a3d49efe5 clang::Sema::ActOnEndOfTranslationUnit()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x4dbdfe5)
#29 0x0000559a3d38e80a
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x4cad80a)
#30 0x0000559a3d3817f9 clang::ParseAST(clang::Sema&, bool, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x4ca07f9)
#31 0x0000559a3c5b0792 clang::CodeGenAction::ExecuteAction()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ecf792)
#32 0x0000559a3bfabe81 clang::FrontendAction::Execute()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x38cae81)
#33 0x0000559a3bf4b9a3
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x386a9a3)
#34 0x0000559a3c072ec3
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3991ec3)
#35 0x0000559a396b60ec cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xfd50ec)
#36 0x0000559a396b226d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
driver.cpp:0:0
#37 0x0000559a3be06645 void llvm::function_ref<void
()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
>, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#38 0x0000559a3b69c4e3
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x2fbb4e3)
#39 0x0000559a3be06f78
clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
>, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) const (.part.166) Job.cpp:0:0
#40 0x0000559a3bddf34a
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x36fe34a)
#41 0x0000559a3bddfe9f
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x36fee9f)
#42 0x0000559a3bde8da5
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3707da5)
#43 0x0000559a395cfd5e main
(/opt/compiler-explorer/clang-trunk/bin/clang+++0xeeed5e)
#44 0x00007fcff402d0b3 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b3)
#45 0x0000559a396b1dea _start
(/opt/compiler-explorer/clang-trunk/bin/clang+++0xfd0dea)
clang-13: error: clang frontend command failed with exit code 139 (use -v to
see invocation)
Compiler returned: 139

Live on Compiler Explorer: https://gcc.godbolt.org/z/bWWe9d

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