| Issue |
173361
|
| Summary |
[clang]Clang assertion when generating implicit copy assignment with an ill-formed user-declared `operator=`
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Attacker23
|
The following code has been causing Clang to crash(assertion) since version 11.0.0 and still does in the current trunk (x86‑64).
```cpp
struct A { Err& operator=(const A&); };
struct B { A f; };
void test() { B b1, b2; b1=b2; }
```
Please check: https://godbolt.org/z/4sYdes9Ya
Clang (assertions build) crashes during semantic analysis of copy assignment for a class that contains a member whose class declares an ill-formed copy assignment operator. The compiler emits a diagnostic for the malformed `operator=`, then later aborts while determining/generating the implicit copy assignment for the containing class. This should be handled as a normal error path without an assertion failure.
**Output:**
```
<source>:1:12: error: unknown type name 'Err'
1 | struct A { Err& operator=(const A&); };
| ^
clang++: /root/llvm-project/llvm/tools/clang/include/clang/AST/DeclCXX.h:917: void clang::CXXRecordDecl::setImplicitCopyAssignmentIsDeleted(): Assertion `(data().DefaultedCopyAssignmentIsDeleted || needsOverloadResolutionForCopyAssignment()) && "copy assignment should not be deleted"' failed.
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-assertions-trunk/bin/clang++ -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 <source>
1. <source>:4:30: current parser token ';'
2. <source>:4:13: parsing function body 'test'
3. <source>:4:13: in compound statement ('{}')
#0 0x00000000042eab68 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42eab68)
#1 0x00000000042e7f94 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42e7f94)
#2 0x000000000422cd78 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000075414ec42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000075414ec969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000075414ec42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000075414ec287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000075414ec2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000075414ec39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000006ec830d clang::Sema::DeclareImplicitCopyAssignment(clang::CXXRecordDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ec830d)
#10 0x0000000007102c25 DeclareImplicitMemberFunctionsWithName(clang::Sema&, clang::DeclarationName, clang::SourceLocation, clang::DeclContext const*) SemaLookup.cpp:0:0
#11 0x00000000071202ce LookupDirect(clang::Sema&, clang::LookupResult&, clang::DeclContext const*) SemaLookup.cpp:0:0
#12 0x00000000071205e1 clang::Sema::LookupQualifiedName(clang::LookupResult&, clang::DeclContext*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x71205e1)
#13 0x000000000731d928 clang::Sema::AddMemberOperatorCandidates(clang::OverloadedOperatorKind, clang::SourceLocation, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, clang::OverloadCandidateParamOrder) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x731d928)
#14 0x000000000732fb44 clang::Sema::LookupOverloadedBinOp(clang::OverloadCandidateSet&, clang::OverloadedOperatorKind, clang::UnresolvedSetImpl const&, llvm::ArrayRef<clang::Expr*>, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x732fb44)
#15 0x000000000733a629 clang::Sema::CreateOverloadedBinOp(clang::SourceLocation, clang::BinaryOperatorKind, clang::UnresolvedSetImpl const&, clang::Expr*, clang::Expr*, bool, bool, clang::FunctionDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x733a629)
#16 0x0000000006f3dde2 BuildOverloadedBinOp(clang::Sema&, clang::Scope*, clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*) SemaExpr.cpp:0:0
#17 0x0000000006f94307 clang::Sema::BuildBinOp(clang::Scope*, clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f94307)
#18 0x0000000006f94886 clang::Sema::ActOnBinOp(clang::Scope*, clang::SourceLocation, clang::tok::TokenKind, clang::Expr*, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f94886)
#19 0x0000000006a974d0 clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a974d0)
#20 0x0000000006a9a969 clang::Parser::ParseExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a9a969)
#21 0x0000000006b20299 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b20299)
#22 0x0000000006b17744 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b17744)
#23 0x0000000006b18126 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b18126)
#24 0x0000000006b20a6e clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b20a6e)
#25 0x0000000006b212ba clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b212ba)
#26 0x0000000006a271ab clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a271ab)
#27 0x0000000006a5d66d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a5d66d)
#28 0x0000000006a1a30b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1a30b)
#29 0x0000000006a1aaff clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1aaff)
#30 0x0000000006a2292a clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a2292a)
#31 0x0000000006a238c5 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a238c5)
#32 0x0000000006a0494a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a0494a)
#33 0x0000000004c4b068 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c4b068)
#34 0x0000000004f41965 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f41965)
#35 0x0000000004ec1bfe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ec1bfe)
#36 0x000000000503bced clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x503bced)
#37 0x0000000000de5afc cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde5afc)
#38 0x0000000000ddc54a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#39 0x0000000000ddc6cd int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#40 0x0000000004cbd9b9 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
#41 0x000000000422d214 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x422d214)
#42 0x0000000004cbdfcf 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
#43 0x0000000004c7eab2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c7eab2)
#44 0x0000000004c7fa5e clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c7fa5e)
#45 0x0000000004c86eb5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c86eb5)
#46 0x0000000000de1ef1 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde1ef1)
#47 0x0000000000c8cf44 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc8cf44)
#48 0x000075414ec29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#49 0x000075414ec29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#50 0x0000000000ddbfe5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xddbfe5)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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