llvmbot
commented
11 months ago @llvm/issue-subscribers-clang-codegen
LLVM 17 compiler crashes with this reduced piece of code from ACE SuperTest. I also tried with older versions and it looks like it always was an issue.
Compiler should generate an error, but LLVM just crashes.
Reduced testcase:
```
template <typename> struct foo { enum color : int; };
template <typename T> enum foo<T>::color : T { green };
void fn1() { green; }
```
Error:
```
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: /install/CentOS73/llvm-17/bin/clang-17 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name x_0001.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/work/testcase_SuperTest_Cxx11_14_5_1_4__x_0001 -resource-dir /install/CentOS73/llvm-17/lib/clang/17 -c-isystem /usr/include/x86_64-linux-gnu -cxx-isystem /usr/include/x86_64-linux-gnu -internal-isystem /install/CentOS73/llvm-17/bin/../include/x86_64-unknown-linux-gnu/c++/v1 -internal-isystem /install/CentOS73/llvm-17/bin/../include/c++/v1 -internal-isystem /install/CentOS73/llvm-17/lib/clang/17/include -internal-isystem /usr/local/include -internal-isystem /u/mwdtauto1/mwdtinfra/install/CentOS73/llvm-17/bin/../lib/gcc/x86_64-redhat-linux/9.2.0/../../../../x86_64-redhat-linux/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -fdebug-compilation-dir=/work/testcase_SuperTest_Cxx11_14_5_1_4__x_0001 -ferror-limit 19 -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/x_0001-fca7a3.o -x c++ x_0001.cpp
1. <eof> parser at end of file
2. x_0001.cpp:3:6: LLVM IR generation of declaration 'fn1'
3. x_0001.cpp:3:6: Generating code for declaration 'fn1'
#0 0x000055555963ff08 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/install/CentOS73/llvm-17/bin/clang-17+0x40ebf08)
#1 0x000055555963d74e llvm::sys::RunSignalHandlers() (/install/CentOS73/llvm-17/bin/clang-17+0x40e974e)
#2 0x0000555559640acd SignalHandler(int) Signals.cpp:0:0
#3 0x00007ffff7bce630 __restore_rt sigaction.c:0:0
#4 0x00005555598ca017 clang::CodeGen::CodeGenTypes::ConvertType(clang::QualType) (/install/CentOS73/llvm-17/bin/clang-17+0x4376017)
#5 0x00005555599b6883 clang::CodeGen::CodeGenFunction::EmitLoadOfBitfieldLValue(clang::CodeGen::LValue, clang::SourceLocation) (/install/CentOS73/llvm-17/bin/clang-17+0x4462883)
#6 0x00005555599b3732 clang::CodeGen::CodeGenFunction::EmitLoadOfLValue(clang::CodeGen::LValue, clang::SourceLocation) (/install/CentOS73/llvm-17/bin/clang-17+0x445f732)
#7 0x00005555599d5c23 (anonymous namespace)::ScalarExprEmitter::VisitDeclRefExpr(clang::DeclRefExpr*) CGExprScalar.cpp:0:0
#8 0x00005555599996a5 clang::CodeGen::CodeGenFunction::EmitIgnoredExpr(clang::Expr const*) (/install/CentOS73/llvm-17/bin/clang-17+0x44456a5)
#9 0x00005555599faa6d clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/install/CentOS73/llvm-17/bin/clang-17+0x44a6a6d)
#10 0x0000555559989ef1 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/install/CentOS73/llvm-17/bin/clang-17+0x4435ef1)
#11 0x000055555987788f clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/install/CentOS73/llvm-17/bin/clang-17+0x432388f)
#12 0x000055555986c802 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/install/CentOS73/llvm-17/bin/clang-17+0x4318802)
#13 0x000055555987392a clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/install/CentOS73/llvm-17/bin/clang-17+0x431f92a)
#14 0x000055555986b431 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (/install/CentOS73/llvm-17/bin/clang-17+0x4317431)
#15 0x000055555a42a34c (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) (.llvm.6140880867044269546) ModuleBuilder.cpp:0:0
#16 0x000055555a427d0d clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) CodeGenAction.cpp:0:0
#17 0x000055555be3d97a clang::ParseAST(clang::Sema&, bool, bool) (/install/CentOS73/llvm-17/bin/clang-17+0x68e997a)
#18 0x000055555a320e37 clang::FrontendAction::Execute() (/install/CentOS73/llvm-17/bin/clang-17+0x4dcce37)
#19 0x000055555a2704a4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/install/CentOS73/llvm-17/bin/clang-17+0x4d1c4a4)
#20 0x000055555a421542 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/install/CentOS73/llvm-17/bin/clang-17+0x4ecd542)
#21 0x0000555557e79587 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/install/CentOS73/llvm-17/bin/clang-17+0x2925587)
#22 0x0000555557e76f9e ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#23 0x0000555557e7565c clang_main(int, char**, llvm::ToolContext const&) (/install/CentOS73/llvm-17/bin/clang-17+0x292165c)
#24 0x0000555557e87541 main (/install/CentOS73/llvm-17/bin/clang-17+0x2933541)
#25 0x00007ffff66ce555 __libc_start_main (/lib64/libc.so.6+0x22555)
#26 0x0000555557e67169 _start (/install/CentOS73/llvm-17/bin/clang-17+0x2913169)
clang++: error: unable to execute command: Segmentation fault
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /install/CentOS73/llvm-17/bin
clang++: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/x_0001-78b096.cpp
clang++: note: diagnostic msg: /tmp/x_0001-78b096.sh
clang++: note: diagnostic msg:
********************
```
GCC produces an error, but does not crash:
```
x_0001.cpp:2:44: error: different underlying type in enum ‘enum foo< <template-parameter-1-1> >::color’
2 | template <typename T> enum foo<T>::color : T { green };
| ^
x_0001.cpp:1:47: note: previous definition here
1 | template <typename> struct foo { enum color : int; };
| ^~~
x_0001.cpp: In function ‘void fn1()’:
x_0001.cpp:3:14: error: ‘green’ was not declared in this scope
3 | void fn1() { green; }
| ^~~~~
```
tbaederr
LLVM 17 compiler crashes with this reduced piece of code from ACE SuperTest. I also tried with older versions and it looks like it always was an issue. Compiler should generate an error, but LLVM just crashes.
Reduced testcase:
Error:
GCC produces an error, but does not crash: