danix800 wrote:
This commit surfaces another crash on null stmt inside `CXXDeductionGuideDecl`:
```c
namespace foo {
template <typename, typename> struct is_same;
template <bool, typename _Tp = void> struct enable_if {};
template <bool _Cond, typename _Tp = void>
using enable_if_t = typename enable_if<_Cond, _Tp>::type;
template <typename _Tp, typename _Up>
inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
template <typename _Tp, typename Alloc> struct array {};
template <typename _Tp, typename... _Up>
array(_Tp, _Up...) ->
array<enable_if_t<(is_same_v<_Tp, _Up> && ...)>, _Tp>;
}
```
Will crash when imported:
```
#0 0x00007f15958323ca llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
/home/danis/Sources/llvm-project/llvm/lib/Support/Unix/Signals.inc:567:11
#1 0x00007f159583257b PrintStackTraceSignalHandler(void*)
/home/danis/Sources/llvm-project/llvm/lib/Support/Unix/Signals.inc:641:1
#2 0x00007f1595830bd6 llvm::sys::RunSignalHandlers()
/home/danis/Sources/llvm-project/llvm/lib/Support/Signals.cpp:104:5
#3 0x00007f1595832ca5 SignalHandler(int)
/home/danis/Sources/llvm-project/llvm/lib/Support/Unix/Signals.inc:412:1
#4 0x00007f159525b050 (/lib/x86_64-linux-gnu/libc.so.6+0x3c050)
#5 0x00007f159721022c clang::Stmt::getStmtClass() const
/home/danis/Sources/llvm-project/clang/include/clang/AST/Stmt.h:1178:44
#6 0x00007f1597aab9f1 clang::Stmt::children()
/home/danis/Sources/llvm-project/clang/lib/AST/Stmt.cpp:287:3
#7 0x00007f159734912a clang::Stmt::children() const
/home/danis/Sources/llvm-project/clang/include/clang/AST/Stmt.h:1273:39
#8 0x00007f15973f3d61 clang::Stmt::child_begin() const
/home/danis/Sources/llvm-project/clang/include/clang/AST/Stmt.h:1279:53
#9 0x00007f15973b9746 isAncestorDeclContextOf(clang::DeclContext const*,
clang::Stmt const*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3377:47
#10 0x00007f15973b9c38 (anonymous
namespace)::IsTypeDeclaredInsideVisitor::checkTemplateArgument(clang::TemplateArgument
const&) /home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3507:7
#11 0x00007f15973b93fe (anonymous
namespace)::IsTypeDeclaredInsideVisitor::VisitTemplateSpecializationType(clang::TemplateSpecializationType
const*) /home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3467:11
#12 0x00007f15973b89b9 clang::TypeVisitor<(anonymous
namespace)::IsTypeDeclaredInsideVisitor,
std::optional<bool>>::Visit(clang::Type const*)
/home/danis/Sources/llvm-project/build/tools/clang/include/clang/AST/TypeNodes.inc:71:1
#13 0x00007f1597385113 (anonymous
namespace)::IsTypeDeclaredInsideVisitor::CheckType(clang::QualType)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3426:37
#14 0x00007f15973b9c0e (anonymous
namespace)::IsTypeDeclaredInsideVisitor::checkTemplateArgument(clang::TemplateArgument
const&) /home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3505:7
#15 0x00007f15973b93fe (anonymous
namespace)::IsTypeDeclaredInsideVisitor::VisitTemplateSpecializationType(clang::TemplateSpecializationType
const*) /home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3467:11
#16 0x00007f15973b89b9 clang::TypeVisitor<(anonymous
namespace)::IsTypeDeclaredInsideVisitor,
std::optional<bool>>::Visit(clang::Type const*)
/home/danis/Sources/llvm-project/build/tools/clang/include/clang/AST/TypeNodes.inc:71:1
#17 0x00007f1597385113 (anonymous
namespace)::IsTypeDeclaredInsideVisitor::CheckType(clang::QualType)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3426:37
#18 0x00007f1597384f42
clang::ASTNodeImporter::hasReturnTypeDeclaredInside(clang::FunctionDecl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3556:5
#19 0x00007f1597385d8e
clang::ASTNodeImporter::VisitFunctionDecl(clang::FunctionDecl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3709:9
#20 0x00007f1597387fab
clang::ASTNodeImporter::VisitCXXDeductionGuideDecl(clang::CXXDeductionGuideDecl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:3962:10
#21 0x00007f15973e238e clang::declvisitor::Base<std::add_pointer,
clang::ASTNodeImporter, llvm::Expected<clang::Decl*>>::Visit(clang::Decl*)
/home/danis/Sources/llvm-project/build/tools/clang/include/clang/AST/DeclNodes.inc:437:1
#22 0x00007f15973ad9ed clang::ASTImporter::ImportImpl(clang::Decl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:8828:19
#23 0x00007f1597391055 clang::ASTImporter::Import(clang::Decl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:9219:8
#24 0x00007f15973d30f7 llvm::Error
clang::ASTNodeImporter::importInto<clang::FunctionDecl>(clang::FunctionDecl*&,
clang::FunctionDecl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:193:11
#25 0x00007f159739a2c7
clang::ASTNodeImporter::VisitFunctionTemplateDecl(clang::FunctionTemplateDecl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:6502:13
#26 0x00007f15973e217e clang::declvisitor::Base<std::add_pointer,
clang::ASTNodeImporter, llvm::Expected<clang::Decl*>>::Visit(clang::Decl*)
/home/danis/Sources/llvm-project/build/tools/clang/include/clang/AST/DeclNodes.inc:245:1
#27 0x00007f15973ad9ed clang::ASTImporter::ImportImpl(clang::Decl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:8828:19
#28 0x00007f1597391055 clang::ASTImporter::Import(clang::Decl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:9219:8
#29 0x00007f15973bc943 std::conditional<std::is_base_of_v<clang::Type,
clang::Decl>, llvm::Expected<clang::Decl const*>,
llvm::Expected<clang::Decl*>>::type
clang::ASTNodeImporter::import<clang::Decl>(clang::Decl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:205:12
#30 0x00007f159737d384
clang::ASTNodeImporter::ImportDeclContext(clang::DeclContext*, bool)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:2036:10
#31 0x00007f159737f831
clang::ASTNodeImporter::VisitNamespaceDecl(clang::NamespaceDecl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:2559:13
#32 0x00007f15973e2060 clang::declvisitor::Base<std::add_pointer,
clang::ASTNodeImporter, llvm::Expected<clang::Decl*>>::Visit(clang::Decl*)
/home/danis/Sources/llvm-project/build/tools/clang/include/clang/AST/DeclNodes.inc:143:1
#33 0x00007f15973ad9ed clang::ASTImporter::ImportImpl(clang::Decl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:8828:19
#34 0x00007f1597391055 clang::ASTImporter::Import(clang::Decl*)
/home/danis/Sources/llvm-project/clang/lib/AST/ASTImporter.cpp:9219:8
#35 0x000055f6d583892a
clang::ast_matchers::ASTImporterTestBase::TU::import(std::shared_ptr<clang::ASTImporterSharedState>
const&, clang::ASTUnit*, clang::Decl*)
/home/danis/Sources/llvm-project/clang/unittests/AST/ASTImporterFixtures.cpp:83:12
#36 0x000055f6d58391a8
clang::ast_matchers::ASTImporterTestBase::getImportedDecl(llvm::StringRef,
clang::TestLanguage, llvm::StringRef, clang::TestLanguage, llvm::StringRef)
/home/danis/Sources/llvm-project/clang/unittests/AST/ASTImporterFixtures.cpp:166:9
#37 0x000055f6d589cc94
clang::ast_matchers::ASTImporterOptionSpecificTestBase_NoCrashOnCXXDeductionGuideDecl_Test::TestBody()
/home/danis/Sources/llvm-project/clang/unittests/AST/ASTImporterTest.cpp:6378:3
#38 0x00007f1598b80b5b void
testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test,
void>(testing::Test*, void (testing::Test::*)(), char const*)
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:2433:3
#39 0x00007f1598b696e7 void
testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,
void>(testing::Test*, void (testing::Test::*)(), char const*)
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:2488:5
#40 0x00007f1598b52d93 testing::Test::Run()
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:2515:3
#41 0x00007f1598b535ea testing::TestInfo::Run()
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:2687:12
#42 0x00007f1598b53b4b testing::TestSuite::Run()
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:2815:44
#43 0x00007f1598b5c329 testing::internal::UnitTestImpl::RunAllTests()
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:5337:24
#44 0x00007f1598b83c5b bool
testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,
bool>(testing::internal::UnitTestImpl*, bool
(testing::internal::UnitTestImpl::*)(), char const*)
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:2433:3
#45 0x00007f1598b6b6f7 bool
testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,
bool>(testing::internal::UnitTestImpl*, bool
(testing::internal::UnitTestImpl::*)(), char const*)
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:2488:5
#46 0x00007f1598b5bf0f testing::UnitTest::Run()
/home/danis/Sources/llvm-project/third-party/unittest/googletest/src/gtest.cc:4925:10
#47 0x00007f1599631d61 RUN_ALL_TESTS()
/home/danis/Sources/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:2472:3
#48 0x00007f1599631ca4 main
/home/danis/Sources/llvm-project/third-party/unittest/UnitTestMain/TestMain.cpp:55:3
#49 0x00007f159524624a __libc_start_call_main
./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#50 0x00007f1595246305 call_init ./csu/../csu/libc-start.c:128:20
#51 0x00007f1595246305 __libc_start_main ./csu/../csu/libc-start.c:347:5
#52 0x000055f6d57df631 _start
(build/tools/clang/unittests/AST/ASTTests+0x471631)
Segmentation fault
```
Another PR would fix the crash when this one is landed.
https://github.com/llvm/llvm-project/pull/101031
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