[llvm-bugs] [Bug 51032] New: C++20 lambdas in unevaluated context: crash on valid code
via llvm-bugs
llvm-bugs at lists.llvm.org
Thu Jul 8 14:23:57 PDT 2021
https://bugs.llvm.org/show_bug.cgi?id=51032
Bug ID: 51032
Summary: C++20 lambdas in unevaluated context: crash on valid
code
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++2a
Assignee: unassignedclangbugs at nondot.org
Reporter: janpmoeller at gmx.de
CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk
clang (trunk) crashes on the following valid c++20 program:
///////////////////////////////////////////////////////////////////////////////
template <typename T, typename Fn>
struct foo_t {
foo_t(T ptr) {}
};
template <typename T>
using alias = foo_t<T, decltype([](int) { return 0; })>;
template <typename T>
auto fun(T const& t) -> alias<T> {
return alias<T>{t};
}
int main() {
int i;
auto const error = fun(i);
}
///////////////////////////////////////////////////////////////////////////////
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
/app/output.s -mllvm --x86-asm-syntax=intel -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>:14:5: LLVM IR generation of declaration 'main'
3. <source>:14:5: Generating code for declaration 'main'
#0 0x000055bedd4185cf PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#1 0x000055bedd4164c0 llvm::sys::CleanupOnSignal(unsigned long)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x33664c0)
#2 0x000055bedd36abe8 CrashRecoverySignalHandler(int)
CrashRecoveryContext.cpp:0:0
#3 0x00007fb1c17453c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
#4 0x000055bedfc0547c clang::ASTContext::getTypeInfoImpl(clang::Type const*)
const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5b5547c)
#5 0x000055bedfbf886d clang::ASTContext::getTypeInfo(clang::Type const*) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x5b4886d)
#6 0x000055bedfc0426b clang::ASTContext::getPreferredTypeAlign(clang::Type
const*) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5b5426b)
#7 0x000055bedfc066bb clang::ASTContext::getDeclAlign(clang::Decl const*,
bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5b566bb)
#8 0x000055bedd9c6505
clang::CodeGen::CodeGenFunction::EmitAutoVarAlloca(clang::VarDecl const&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3916505)
#9 0x000055bedd9c727a
clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x391727a)
#10 0x000055bedd9c757d clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl
const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x391757d)
#11 0x000055bedd73f327
clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x368f327)
#12 0x000055bedd74eaf5
clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*,
llvm::ArrayRef<clang::Attr const*>)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x369eaf5)
#13 0x000055bedd7493e2 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt
const*, llvm::ArrayRef<clang::Attr const*>)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x36993e2)
#14 0x000055bedd74e60c
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x369e60c)
#15 0x000055bedd79b101
clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x36eb101)
#16 0x000055bedd7a3a17
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x36f3a17)
#17 0x000055bedd7e8ffe
clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3738ffe)
#18 0x000055bedd7e5e25
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3735e25)
#19 0x000055bedd7e652b
clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x373652b)
#20 0x000055bedd7ec101
clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.5273)
CodeGenModule.cpp:0:0
#21 0x000055bede34be51 (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef)
ModuleBuilder.cpp:0:0
#22 0x000055bede33fc42
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x428fc42)
#23 0x000055bedf19f1c4 clang::ParseAST(clang::Sema&, bool, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x50ef1c4)
#24 0x000055bede349d62 clang::CodeGenAction::ExecuteAction()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x4299d62)
#25 0x000055beddcfbe61 clang::FrontendAction::Execute()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c4be61)
#26 0x000055beddc99bc2
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3be9bc2)
#27 0x000055bedddc8343
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d18343)
#28 0x000055bedb21f00c cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x116f00c)
#29 0x000055bedb21b19d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
driver.cpp:0:0
#30 0x000055beddb486c5 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
#31 0x000055bedd36b1d3
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x32bb1d3)
#32 0x000055beddb4a59e
clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
>, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3a9a59e)
#33 0x000055beddb2075a
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3a7075a)
#34 0x000055beddb212af
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+++0x3a712af)
#35 0x000055beddb2a255
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3a7a255)
#36 0x000055bedb133993 main
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x1083993)
#37 0x00007fb1c11f50b3 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b3)
#38 0x000055bedb21ad1a _start
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x116ad1a)
clang-13: error: clang frontend command failed with exit code 139 (use -v to
see invocation)
Compiler returned: 139
This was found while reporting a gcc bug (101315) and comparing gcc's output to
clang's. See this link on godbolt: https://godbolt.org/z/5fcK1az5M
--
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20210708/b01a660f/attachment.html>
More information about the llvm-bugs
mailing list