[llvm-bugs] [Bug 43200] New: Assertion failure: Copy constructor should not be deleted

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Sep 2 19:18:46 PDT 2019 

https://bugs.llvm.org/show_bug.cgi?id=43200

            Bug ID: 43200
           Summary: Assertion failure: Copy constructor should not be
                    deleted
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david at doublewise.net
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

The following code causes an assertion failure on clang trunk:


template <bool> struct enable_if {};
template <typename> struct types {};
template <typename LHS, typename RHS>
constexpr bool operator==(types<LHS>, types<RHS>) {
  return true;
}
template <typename T>
constexpr bool is_valid = types<T>{} == types<T &>{};
struct A {
  template <typename T, typename = typename enable_if<is_valid<T>>::type>
  A(T value);
};
struct B {
  A m_max;
};
struct C {
  B m_pp;
};
B &make_b();
bool operator==(C, C) { auto b = make_b(); }







clang-10: /home/david/llvm/clang/include/clang/AST/DeclCXX.h:1020: void
clang::CXXRecordDecl::setImplicitCopyConstructorIsDeleted(): Assertion
`(data().DefaultedCopyConstructorIsDeleted ||
needsOverloadResolutionForCopyConstructor()) && "Copy constructor should not be
deleted"' failed.
Stack dump:
0.      Program arguments: /home/david/llvm/build/bin/clang-10 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
test.cpp -mrelocation-model static -mthread-model posix -mframe-pointer=all
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb
-coverage-notes-file /dev/null.gcno -resource-dir
/home/david/llvm/build/lib/clang/10.0.0 -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9 -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9/x86_64-pc-linux-gnu
-internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9/backward
-internal-isystem /usr/local/include -internal-isystem
/home/david/llvm/build/lib/clang/10.0.0/include -internal-externc-isystem
/include -internal-externc-isystem /usr/include -Wfatal-errors -w -std=c++17
-fdeprecated-macro -fdebug-compilation-dir /home/david/tm5/reduce -ferror-limit
19 -fmessage-length 0 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o /dev/null -x c++ test.cpp 
1.      test.cpp:20:42: current parser token ';'
2.      test.cpp:20:23: parsing function body 'operator=='
3.      test.cpp:20:23: in compound statement ('{}')
4.      test.cpp:8:16: instantiating variable definition 'is_valid<A>'
 #0 0x000000000313ee4d PrintStackTraceSignalHandler(void*)
(.llvm.14200593635904155002) (/home/david/llvm/build/bin/clang-10+0x313ee4d)
 #1 0x000000000313c630 llvm::sys::RunSignalHandlers()
(/home/david/llvm/build/bin/clang-10+0x313c630)
 #2 0x000000000313f2e8 SignalHandler(int)
(/home/david/llvm/build/bin/clang-10+0x313f2e8)
 #3 0x00007f8f7f671660 __restore_rt (/lib64/libpthread.so.0+0x14660)
 #4 0x00007f8f7f082d21 raise (/lib64/libc.so.6+0x38d21)
 #5 0x00007f8f7f06c535 abort (/lib64/libc.so.6+0x22535)
 #6 0x00007f8f7f06c40f _nl_load_domain.cold (/lib64/libc.so.6+0x2240f)
 #7 0x00007f8f7f07a712 (/lib64/libc.so.6+0x30712)
 #8 0x0000000004ccbf4f (/home/david/llvm/build/bin/clang-10+0x4ccbf4f)
 #9 0x0000000004f15fc2 void llvm::function_ref<void
()>::callback_fn<clang::Sema::LookupConstructors(clang::CXXRecordDecl*)::$_13>(long)
(/home/david/llvm/build/bin/clang-10+0x4f15fc2)
#10 0x0000000004efbf95 clang::Sema::LookupConstructors(clang::CXXRecordDecl*)
(/home/david/llvm/build/bin/clang-10+0x4efbf95)
#11 0x0000000004fcd257 IsUserDefinedConversion(clang::Sema&, clang::Expr*,
clang::QualType, clang::UserDefinedConversionSequence&,
clang::OverloadCandidateSet&, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x4fcd257)
#12 0x0000000004ffffc0 TryUserDefinedConversion(clang::Sema&, clang::Expr*,
clang::QualType, bool, bool, bool, bool, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x4ffffc0)
#13 0x0000000004fc6aff TryImplicitConversion(clang::Sema&, clang::Expr*,
clang::QualType, bool, bool, bool, bool, bool, bool)
(.llvm.5478737526472470733) (/home/david/llvm/build/bin/clang-10+0x4fc6aff)
#14 0x0000000004fd794d TryCopyInitialization(clang::Sema&, clang::Expr*,
clang::QualType, bool, bool, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x4fd794d)
#15 0x0000000004fd6572 clang::Sema::AddOverloadCandidate(clang::FunctionDecl*,
clang::DeclAccessPair, llvm::ArrayRef<clang::Expr*>,
clang::OverloadCandidateSet&, bool, bool, bool, bool,
clang::CallExpr::ADLCallKind,
llvm::MutableArrayRef<clang::ImplicitConversionSequence>)
(/home/david/llvm/build/bin/clang-10+0x4fd6572)
#16 0x0000000004fe3723
clang::Sema::AddArgumentDependentLookupCandidates(clang::DeclarationName,
clang::SourceLocation, llvm::ArrayRef<clang::Expr*>,
clang::TemplateArgumentListInfo*, clang::OverloadCandidateSet&, bool)
(/home/david/llvm/build/bin/clang-10+0x4fe3723)
#17 0x0000000004ff343f
clang::Sema::CreateOverloadedBinOp(clang::SourceLocation,
clang::BinaryOperatorKind, clang::UnresolvedSetImpl const&, clang::Expr*,
clang::Expr*, bool) (/home/david/llvm/build/bin/clang-10+0x4ff343f)
#18 0x000000000516e0c0 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCXXOperatorCallExpr(clang::CXXOperatorCallExpr*)
(/home/david/llvm/build/bin/clang-10+0x516e0c0)
#19 0x00000000051ad93c
clang::Sema::InstantiateVariableInitializer(clang::VarDecl*, clang::VarDecl*,
clang::MultiLevelTemplateArgumentList const&)
(/home/david/llvm/build/bin/clang-10+0x51ad93c)
#20 0x00000000051ad6ee
clang::Sema::CompleteVarTemplateSpecializationDecl(clang::VarTemplateSpecializationDecl*,
clang::VarDecl*, clang::MultiLevelTemplateArgumentList const&)
(/home/david/llvm/build/bin/clang-10+0x51ad6ee)
#21 0x00000000051aee0d
clang::Sema::InstantiateVariableDefinition(clang::SourceLocation,
clang::VarDecl*, bool, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x51aee0d)
#22 0x0000000004dc0f3c DoMarkVarDeclReferenced(clang::Sema&,
clang::SourceLocation, clang::VarDecl*, clang::Expr*)
(.llvm.6274768002712316616) (/home/david/llvm/build/bin/clang-10+0x4dc0f3c)
#23 0x0000000004d6cb3d clang::Sema::BuildDeclRefExpr(clang::ValueDecl*,
clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&,
clang::NestedNameSpecifierLoc, clang::NamedDecl*, clang::SourceLocation,
clang::TemplateArgumentListInfo const*)
(/home/david/llvm/build/bin/clang-10+0x4d6cb3d)
#24 0x0000000004d72761
clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&,
clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::NamedDecl*,
clang::TemplateArgumentListInfo const*, bool)
(/home/david/llvm/build/bin/clang-10+0x4d72761)
#25 0x000000000507ab55 clang::Sema::CheckVarTemplateId(clang::CXXScopeSpec
const&, clang::DeclarationNameInfo const&, clang::VarTemplateDecl*,
clang::SourceLocation, clang::TemplateArgumentListInfo const*)
(/home/david/llvm/build/bin/clang-10+0x507ab55)
#26 0x000000000517324c clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformUnresolvedLookupExpr(clang::UnresolvedLookupExpr*)
(/home/david/llvm/build/bin/clang-10+0x517324c)
#27 0x00000000051786ec clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformTemplateArgument(clang::TemplateArgumentLoc
const&, clang::TemplateArgumentLoc&, bool)
(/home/david/llvm/build/bin/clang-10+0x51786ec)
#28 0x0000000005176e14 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformTemplateSpecializationType(clang::TypeLocBuilder&,
clang::TemplateSpecializationTypeLoc, clang::TemplateName)
(/home/david/llvm/build/bin/clang-10+0x5176e14)
#29 0x000000000517656c clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformTSIInObjectScope(clang::TypeLoc,
clang::QualType, clang::NamedDecl*, clang::CXXScopeSpec&)
(/home/david/llvm/build/bin/clang-10+0x517656c)
#30 0x0000000005165278 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformNestedNameSpecifierLoc(clang::NestedNameSpecifierLoc,
clang::QualType, clang::NamedDecl*) (.llvm.209458239465659423)
(/home/david/llvm/build/bin/clang-10+0x5165278)
#31 0x000000000517d8af clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformDependentNameType(clang::TypeLocBuilder&,
clang::DependentNameTypeLoc, bool)
(/home/david/llvm/build/bin/clang-10+0x517d8af)
#32 0x000000000514ff48 clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformType(clang::TypeSourceInfo*)
(.llvm.209458239465659423) (/home/david/llvm/build/bin/clang-10+0x514ff48)
#33 0x000000000507d989 SubstDefaultTemplateArgument(clang::Sema&,
clang::TemplateDecl*, clang::SourceLocation, clang::SourceLocation,
clang::TemplateTypeParmDecl*, llvm::SmallVectorImpl<clang::TemplateArgument>&)
(/home/david/llvm/build/bin/clang-10+0x507d989)
#34 0x000000000507d446
clang::Sema::SubstDefaultTemplateArgumentIfAvailable(clang::TemplateDecl*,
clang::SourceLocation, clang::SourceLocation, clang::Decl*,
llvm::SmallVectorImpl<clang::TemplateArgument>&, bool&)
(/home/david/llvm/build/bin/clang-10+0x507d446)
#35 0x000000000510b957
clang::Sema::FinishTemplateArgumentDeduction(clang::FunctionTemplateDecl*,
llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&, unsigned int,
clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&,
llvm::SmallVectorImpl<clang::Sema::OriginalCallArg> const*, bool,
llvm::function_ref<bool ()>) (/home/david/llvm/build/bin/clang-10+0x510b957)
#36 0x000000000510dcc1
clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*,
clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>,
clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool,
llvm::function_ref<bool (llvm::ArrayRef<clang::QualType>)>)
(/home/david/llvm/build/bin/clang-10+0x510dcc1)
#37 0x0000000004fdaff7
clang::Sema::AddTemplateOverloadCandidate(clang::FunctionTemplateDecl*,
clang::DeclAccessPair, clang::TemplateArgumentListInfo*,
llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool, bool,
clang::CallExpr::ADLCallKind) (/home/david/llvm/build/bin/clang-10+0x4fdaff7)
#38 0x0000000004efb845 clang::Sema::LookupSpecialMember(clang::CXXRecordDecl*,
clang::Sema::CXXSpecialMember, bool, bool, bool, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x4efb845)
#39 0x0000000004cc5944 defaultedSpecialMemberIsConstexpr(clang::Sema&,
clang::CXXRecordDecl*, clang::Sema::CXXSpecialMember, bool,
clang::CXXConstructorDecl*, clang::Sema::InheritedConstructorInfo*)
(/home/david/llvm/build/bin/clang-10+0x4cc5944)
#40 0x0000000004ccb81b
clang::Sema::DeclareImplicitCopyConstructor(clang::CXXRecordDecl*)
(/home/david/llvm/build/bin/clang-10+0x4ccb81b)
#41 0x0000000004f15fc2 void llvm::function_ref<void
()>::callback_fn<clang::Sema::LookupConstructors(clang::CXXRecordDecl*)::$_13>(long)
(/home/david/llvm/build/bin/clang-10+0x4f15fc2)
#42 0x0000000004efbf95 clang::Sema::LookupConstructors(clang::CXXRecordDecl*)
(/home/david/llvm/build/bin/clang-10+0x4efbf95)
#43 0x0000000004eb4656 TryConstructorInitialization(clang::Sema&,
clang::InitializedEntity const&, clang::InitializationKind const&,
llvm::MutableArrayRef<clang::Expr*>, clang::QualType, clang::QualType,
clang::InitializationSequence&, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x4eb4656)
#44 0x0000000004eb0c3c
clang::InitializationSequence::InitializeFrom(clang::Sema&,
clang::InitializedEntity const&, clang::InitializationKind const&,
llvm::MutableArrayRef<clang::Expr*>, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x4eb0c3c)
#45 0x0000000004bd3924 clang::Sema::AddInitializerToDecl(clang::Decl*,
clang::Expr*, bool) (/home/david/llvm/build/bin/clang-10+0x4bd3924)
#46 0x00000000049b5d75
clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*)
(/home/david/llvm/build/bin/clang-10+0x49b5d75)
#47 0x00000000049b3b93 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/home/david/llvm/build/bin/clang-10+0x49b3b93)
#48 0x00000000049add95
clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, bool,
clang::Parser::ForRangeInit*, clang::SourceLocation*)
(/home/david/llvm/build/bin/clang-10+0x49add95)
#49 0x00000000049ad414
clang::Parser::ParseDeclaration(clang::DeclaratorContext,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&,
clang::SourceLocation*) (/home/david/llvm/build/bin/clang-10+0x49ad414)
#50 0x00000000049831d1
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/home/david/llvm/build/bin/clang-10+0x49831d1)
#51 0x0000000004982abb
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*)
(/home/david/llvm/build/bin/clang-10+0x4982abb)
#52 0x000000000498c84e clang::Parser::ParseCompoundStatementBody(bool)
(/home/david/llvm/build/bin/clang-10+0x498c84e)
#53 0x000000000498d8a2 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) (/home/david/llvm/build/bin/clang-10+0x498d8a2)
#54 0x000000000496a8cb
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(/home/david/llvm/build/bin/clang-10+0x496a8cb)
#55 0x00000000049b3a06 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/home/david/llvm/build/bin/clang-10+0x49b3a06)
#56 0x000000000496965c
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/home/david/llvm/build/bin/clang-10+0x496965c)
#57 0x0000000004968f4f
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier)
(/home/david/llvm/build/bin/clang-10+0x4968f4f)
#58 0x0000000004967d79
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) (/home/david/llvm/build/bin/clang-10+0x4967d79)
#59 0x0000000004965a7d
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool)
(/home/david/llvm/build/bin/clang-10+0x4965a7d)
#60 0x0000000004960fb4 clang::ParseAST(clang::Sema&, bool, bool)
(/home/david/llvm/build/bin/clang-10+0x4960fb4)
#61 0x0000000003ab7c1f clang::FrontendAction::Execute()
(/home/david/llvm/build/bin/clang-10+0x3ab7c1f)
#62 0x0000000003a154d8
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/david/llvm/build/bin/clang-10+0x3a154d8)
#63 0x0000000003b64067
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/david/llvm/build/bin/clang-10+0x3b64067)
#64 0x000000000201134f cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/home/david/llvm/build/bin/clang-10+0x201134f)
#65 0x000000000200f048 main (/home/david/llvm/build/bin/clang-10+0x200f048)
#66 0x00007f8f7f06df1b __libc_start_main (/lib64/libc.so.6+0x23f1b)
#67 0x000000000200c02a _start (/home/david/llvm/build/bin/clang-10+0x200c02a)
clang-10: fatal error: unable to execute command: Aborted (core dumped)
clang version 10.0.0 (https://github.com/llvm-project/llvm-project-20170507/
ca2448658e135c6576df4eead8b997ebede4f0fa)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/david/llvm/build/bin

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