<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/129998>129998</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
[ICE-on-valid] CTAD through alias template causes crash in `TemplateArgument::getNonTypeTemplateArgumentType`
</td>
</tr>
<tr>
<th>Labels</th>
<td>
new issue
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
ericniebler
</td>
</tr>
</table>
<pre>
The following code, compiled with `-std=c++23` with the latest compiler from trunk, causes clang to ICE. I believe the code is conforming, and gcc trunk accepts it.
```c++
#include <concepts>
#include <cstdint>
#include <limits>
#include <span>
#include <type_traits>
#include <utility>
template <auto Nullopt>
struct inline_optional;
namespace detail
{
template <auto Type>
concept _integral_wrapper = std::integral<decltype(Type)>;
template <class... Ts>
consteval auto _dynamic_extent_of_helper(Ts...) noexcept
{
using integral_t = std::common_type_t<Ts...>;
if constexpr (std::unsigned_integral<integral_t>)
{
return std::numeric_limits<integral_t>::max();
}
else
{
return std::numeric_limits<integral_t>::min();
}
}
template <class... Ts>
constexpr auto _dynamic_extent_of = detail::_dynamic_extent_of_helper(+Ts{}...);
template <class Type, class... Ts>
constexpr auto _tparam_for = (std::integral<Type> ? inline_optional<_dynamic_extent_of<Ts...>>{} : +Type{});
} // namespace detail
template <auto Value>
using constant = std::integral_constant<decltype(Value), Value>;
template <class Type>
concept integral_wrapper = detail::_integral_wrapper<Type::value> && requires {
{ auto(Type::value) } -> std::same_as<typename Type::value_type>;
};
template <class Type>
concept integral_like = std::integral<Type> || integral_wrapper<Type>;
template <auto Nullopt>
struct inline_optional
{
using value_type = decltype(Nullopt);
inline_optional() = default;
constexpr inline_optional(value_type v) noexcept
: value_(v)
{}
template <auto OtherNullopt>
constexpr inline_optional(inline_optional<OtherNullopt> other) noexcept
: value_(other.has_value() ? static_cast<value_type>(other.value()) : Nullopt)
{
}
constexpr auto operator*() const noexcept -> value_type
{
return value_;
}
constexpr auto value() const noexcept -> value_type
{
return value_;
}
constexpr auto has_value() const noexcept -> bool
{
return value_ != Nullopt;
}
auto operator==(inline_optional const& other) const noexcept -> bool = default;
value_type value_{Nullopt};
static constexpr value_type nullopt = Nullopt;
};
struct empty
{
empty() = default;
constexpr empty(integral_wrapper auto) noexcept {}
};
template <auto V>
using _typeof = decltype(auto(V));
template <class IndexType, IndexType Dyn>
struct _extents
{
using index_type = IndexType;
template <index_type... Extents>
struct type;
template <index_type A, index_type B>
struct type<A, B>
{
static constexpr auto i = A.value();
static constexpr auto j = B.value();
empty _i, _j;
};
template <index_type A>
struct type<A, Dyn>
{
static constexpr int i = A.value();
empty _i;
int j;
};
template <class... Extents>
type(Extents...) -> type<(std::integral<Extents> ? Dyn : +Extents{})...>;
};
using extent64_t = inline_optional<detail::_dynamic_extent_of<std::uint64_t>>;
template <extent64_t... Extents>
using extents = _extents<extent64_t, {}>::type<Extents...>;
[[deprecated]] void print(auto) {}
int main()
{
extents<0, {}> e{{}, 42};
_extents<extent64_t, {}>::type t{constant<1>{},2};
extents t2{constant<1>{},2};
}
```
The stack trace:
```
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/compiler-explorer/clang-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++23 <source>
1. <source>:134:30: current parser token ';'
2. <source>:131:1: parsing function body 'main'
3. <source>:131:1: in compound statement ('{}')
#0 0x0000000003b4d588 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3b4d588)
#1 0x0000000003b4b6cc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3b4b6cc)
#2 0x0000000003a9aa78 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007e0449442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000000000759c68f clang::TemplateArgument::getNonTypeTemplateArgumentType() const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x759c68f)
#5 0x0000000006b04c68 checkDeducedTemplateArguments(clang::ASTContext&, clang::DeducedTemplateArgument const&, clang::DeducedTemplateArgument const&, bool) (.part.0) SemaTemplateDeduction.cpp:0:0
#6 0x0000000006b0e8a4 (anonymous namespace)::PackDeductionScope::finish() (.part.0) SemaTemplateDeduction.cpp:0:0
#7 0x0000000006b5763f clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool, bool, bool, clang::QualType, clang::Expr::Classification, llvm::function_ref<bool (llvm::ArrayRef<clang::QualType>)>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6b5763f)
#8 0x000000000695cdc0 clang::Sema::AddTemplateOverloadCandidate(clang::FunctionTemplateDecl*, clang::DeclAccessPair, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool, bool, clang::CallExpr::ADLCallKind, clang::OverloadCandidateParamOrder, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x695cdc0)
#9 0x000000000674533a clang::Sema::DeduceTemplateSpecializationFromInitializer(clang::TypeSourceInfo*, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>)::'lambda0'(bool)::operator()(bool) const SemaInit.cpp:0:0
#10 0x0000000006745cb2 clang::Sema::DeduceTemplateSpecializationFromInitializer(clang::TypeSourceInfo*, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6745cb2)
#11 0x00000000063bba08 clang::Sema::deduceVarTypeFromInitializer(clang::VarDecl*, clang::DeclarationName, clang::QualType, clang::TypeSourceInfo*, clang::SourceRange, bool, clang::Expr*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63bba08)
#12 0x00000000063d84bb clang::Sema::DeduceVariableDeclarationType(clang::VarDecl*, bool, clang::Expr*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63d84bb)
#13 0x0000000006400a8c clang::Sema::AddInitializerToDecl(clang::Decl*, clang::Expr*, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6400a8c)
#14 0x0000000006079fee clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6079fee)
#15 0x000000000608f76c clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x608f76c)
#16 0x000000000609228a clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x609228a)
#17 0x000000000609278f clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x609278f)
#18 0x0000000006147ea4 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6147ea4)
#19 0x00000000061487fd clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x61487fd)
#20 0x0000000006149b14 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6149b14)
#21 0x000000000614acca clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x614acca)
#22 0x0000000006045bf6 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6045bf6)
#23 0x000000000608fbcf clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x608fbcf)
#24 0x000000000603e1b7 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x603e1b7)
#25 0x000000000603efce clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x603efce)
#26 0x00000000060488d2 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x60488d2)
#27 0x000000000604a168 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x604a168)
#28 0x000000000603880a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x603880a)
#29 0x00000000044c8ff5 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x44c8ff5)
#30 0x00000000047a3241 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x47a3241)
#31 0x0000000004723e7b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4723e7b)
#32 0x0000000004890233 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4890233)
#33 0x0000000000d63321 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xd63321)
#34 0x0000000000d5bb2d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#35 0x0000000004515569 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
#36 0x0000000003a9aea3 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3a9aea3)
#37 0x0000000004515789 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
#38 0x00000000044d95ad clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x44d95ad)
#39 0x00000000044da541 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x44da541)
#40 0x00000000044e497c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x44e497c)
#41 0x0000000000d5ffe1 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xd5ffe1)
#42 0x0000000000c21914 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc21914)
#43 0x00007e0449429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x00007e0449429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x0000000000d5b5c5 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xd5b5c5)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
Demo:
https://godbolt.org/z/9WsPov173
</pre>
<img width="1" height="1" alt="" 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b6snzU74UV-SYQUvRhJZKl_m8LT-mHG6OwNliT3Fhuwfl1tgNxz1uz2AJYEiv6bL-3vPtBX-5WrLf2fume79G8aXt79_LcNrPpvd8H_BQAA__8TsV0j">