| Issue |
120084
|
| Summary |
clang crash on x86_64-linux-gnu: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
bi6c
|
Compiler Explorer: https://godbolt.org/z/4Prz7vEfW
```console
<source>:3:2: error: expected ';' after union
3 | } long double __mutated_field__;
| ^
| ;
<source>:1:1: warning: declaration does not declare anything [-Wmissing-declarations]
1 | union {
| ^
<source>:4:2: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
4 | a[] = { u"ff", [0].s[0] = u'x', [1] = u"\u1234\u4567", [1].s[0] = u'\u89ab' };
| ^
| int
<source>:4:10: error: incompatible pointer to integer conversion initializing 'int' with an _expression_ of type 'unsigned short[3]' [-Wint-conversion]
4 | a[] = { u"ff", [0].s[0] = u'x', [1] = u"\u1234\u4567", [1].s[0] = u'\u89ab' };
| ^~~~~
clang: /root/llvm-project/llvm/include/llvm/Support/Casting.h:578: decltype(auto) llvm::cast(From*) [with To = clang::ConstantArrayType; From = const clang::ArrayType]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' 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 -gdwarf-4 -g -o /app/output.s -fno-verbose-asm -c --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1. <source>:4:79: current parser token ';'
#0 0x0000000003c56df8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c56df8)
#1 0x0000000003c54b04 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c54b04)
#2 0x0000000003ba2068 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007489e0642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007489e06969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007489e0642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007489e06287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007489e062871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007489e0639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000006c8182f decltype(auto) llvm::cast<clang::ConstantArrayType, clang::ArrayType const>(clang::ArrayType const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6c8182f)
#10 0x0000000006ca858e (anonymous namespace)::InitListChecker::CheckDesignatedInitializer(clang::InitializedEntity const&, clang::InitListExpr*, clang::DesignatedInitExpr*, unsigned int, clang::QualType&, clang::DeclContext::specific_decl_iterator<clang::FieldDecl>*, llvm::APSInt*, unsigned int&, clang::InitListExpr*, unsigned int&, bool, bool) SemaInit.cpp:0:0
#11 0x0000000006cab020 (anonymous namespace)::InitListChecker::CheckArrayType(clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, llvm::APSInt, bool, unsigned int&, clang::InitListExpr*, unsigned int&) SemaInit.cpp:0:0
#12 0x0000000006ca4b59 (anonymous namespace)::InitListChecker::CheckListElementTypes(clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, bool, unsigned int&, clang::InitListExpr*, unsigned int&, bool) (.constprop.0) SemaInit.cpp:0:0
#13 0x0000000006c9327a (anonymous namespace)::InitListChecker::CheckExplicitInitList(clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, clang::InitListExpr*, bool) (.constprop.0) SemaInit.cpp:0:0
#14 0x0000000006c93c7e (anonymous namespace)::InitListChecker::InitListChecker(clang::Sema&, clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, bool, bool, bool, llvm::SmallVectorImpl<clang::QualType>*) SemaInit.cpp:0:0
#15 0x0000000006c94005 diagnoseListInit(clang::Sema&, clang::InitializedEntity const&, clang::InitListExpr*) SemaInit.cpp:0:0
#16 0x0000000006c9eeb4 clang::InitializationSequence::Diagnose(clang::Sema&, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::ArrayRef<clang::Expr*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6c9eeb4)
#17 0x0000000006c945b5 clang::InitializationSequence::Perform(clang::Sema&, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>, clang::QualType*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6c945b5)
#18 0x00000000069675d9 clang::Sema::AddInitializerToDecl(clang::Decl*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x69675d9)
#19 0x000000000660005a clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x660005a)
#20 0x000000000660f0f9 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+0x660f0f9)
#21 0x00000000065ceece clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65ceece)
#22 0x00000000065cf689 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65cf689)
#23 0x00000000065d6e03 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65d6e03)
#24 0x00000000065d7ccd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65d7ccd)
#25 0x00000000065ca20a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65ca20a)
#26 0x00000000045e0668 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45e0668)
#27 0x0000000004899a89 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4899a89)
#28 0x000000000481c48e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x481c48e)
#29 0x00000000049862ce clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49862ce)
#30 0x0000000000ce1c7f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce1c7f)
#31 0x0000000000cd971a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#32 0x0000000004624ad9 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
#33 0x0000000003ba2514 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3ba2514)
#34 0x00000000046250cf 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
#35 0x00000000045ea3dd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45ea3dd)
#36 0x00000000045eb4cd 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+0x45eb4cd)
#37 0x00000000045f2a45 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x45f2a45)
#38 0x0000000000cdeac3 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcdeac3)
#39 0x0000000000bac364 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbac364)
#40 0x00007489e0629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#41 0x00007489e0629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#42 0x0000000000cd91c5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcd91c5)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
Code:
```c
union {
__CHAR16_TYPE__ s[2];
} long double __mutated_field__;
a[] = { u"ff", [0].s[0] = u'x', [1] = u"\u1234\u4567", [1].s[0] = u'\u89ab' };
```
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