| Issue |
173904
|
| Summary |
clang trunk: assertion "Can only have wide bit-fields in C++!" in ItaniumRecordLayoutBuilder when laying out bit-field with attribute((mode(QI))) and width exceeding type size in C mode
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Theaamadu
|
## Compiler Explorer: https://godbolt.org/z/Wz47dPP61
- clang start crashing on `Trunk`
- generated by fuzzer
## Console
```console
clang: /root/llvm-project/llvm/tools/clang/lib/AST/RecordLayoutBuilder.cpp:1462: void {anonymous}::ItaniumRecordLayoutBuilder::LayoutWideBitField(uint64_t, uint64_t, bool, const clang::FieldDecl*): Assertion `Context.getLangOpts().CPlusPlus && "Can only have wide bit-fields in C++!"' 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>:15:3: current parser token 'read_st'
2. <source>:7:9: parsing struct/union body 'union (unnamed at <source>:7:9)'
#0 0x0000000004301458 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4301458)
#1 0x00000000042fe884 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42fe884)
#2 0x0000000004243628 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f1170242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007f11702969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007f1170242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007f11702287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007f117022871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007f1170239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x00000000080bfed7 (anonymous namespace)::ItaniumRecordLayoutBuilder::LayoutField(clang::FieldDecl const*, bool) RecordLayoutBuilder.cpp:0:0
#10 0x00000000080bff92 (anonymous namespace)::ItaniumRecordLayoutBuilder::LayoutFields(clang::RecordDecl const*) RecordLayoutBuilder.cpp:0:0
#11 0x00000000080ba13d clang::ASTContext::getASTRecordLayout(clang::RecordDecl const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x80ba13d)
#12 0x0000000007996f27 clang::ASTContext::getTypeInfoImpl(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7996f27)
#13 0x0000000007993fd7 clang::ASTContext::getTypeInfo(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7993fd7)
#14 0x00000000079970ed clang::ASTContext::getTypeInfoImpl(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x79970ed)
#15 0x0000000007993fd7 clang::ASTContext::getTypeInfo(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7993fd7)
#16 0x0000000007997e4b clang::ASTContext::getTypeInfoInChars(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7997e4b)
#17 0x0000000007998b6b clang::ASTContext::getTypeSizeInChars(clang::QualType) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7998b6b)
#18 0x0000000006de95a7 clang::Sema::ActOnFields(clang::Scope*, clang::SourceLocation, clang::Decl*, llvm::ArrayRef<clang::Decl*>, clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributesView const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6de95a7)
#19 0x0000000006a88e48 clang::Parser::ParseStructUnionBody(clang::SourceLocation, clang::TypeSpecifierType, clang::RecordDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a88e48)
#20 0x0000000006aa4d84 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6aa4d84)
#21 0x0000000006a78cce clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a78cce)
#22 0x0000000006a7f337 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a7f337)
#23 0x0000000006a7f87c clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a7f87c)
#24 0x0000000006a3c41c clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a3c41c)
#25 0x0000000006a3d305 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a3d305)
#26 0x0000000006a1e38a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a1e38a)
#27 0x0000000004c62788 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c62788)
#28 0x0000000004f58e05 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f58e05)
#29 0x0000000004ed909e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ed909e)
#30 0x000000000505318d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x505318d)
#31 0x0000000000de63ec cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xde63ec)
#32 0x0000000000ddce3a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#33 0x0000000000ddcfbd 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
#34 0x0000000004cd4e59 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
#35 0x0000000004243ac4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4243ac4)
#36 0x0000000004cd546f 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
#37 0x0000000004c95f52 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c95f52)
#38 0x0000000004c96efe 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+0x4c96efe)
#39 0x0000000004c9e355 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c9e355)
#40 0x0000000000de27e1 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xde27e1)
#41 0x0000000000c8d114 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc8d114)
#42 0x00007f1170229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#43 0x00007f1170229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#44 0x0000000000ddc8d5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xddc8d5)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
## Code
```c
typedef struct {
unsigned char a;
unsigned short b : 5;
unsigned char c;
int __attribute__((mode(QI))) : 11;
} test_st;
typedef union {
test_st st;
struct {
unsigned int v1;
unsigned int v2;
unsigned int v3;
unsigned int v4;
} values;
} read_st;
typedef void __attribute__((cmse_nonsecure_call)) (*foo_ns)(test_st);
int main(void) {
read_st r;
foo_ns f;
f = (foo_ns)0x200000;
r.values.v1 = 0xFFFFFFFF;
r.values.v2 = 0xFFFFFFFF;
f(r.st);
return 0;
}
```
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