| Issue |
170243
|
| Summary |
[clang] crash in CodeGen with `-std=c89 -O1`
|
| Labels |
clang:codegen,
crash
|
| Assignees |
|
| Reporter |
k-arrows
|
Reproducer:
https://godbolt.org/z/rYKqbP6fY
```c
void *bar (int);
void *foo (void)
{
char *c = "abc";
for (int a = 1;; a = 0)
{
for (char *s = c; *s; ++s)
{
}
if (!a) break;
}
}
```
Backtrace:
```console
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-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 -x c -std=c89 -O1 <source>
1. <eof> parser at end of file
2. <source>:3:7: LLVM IR generation of declaration 'foo'
3. <source>:3:7: Generating code for declaration 'foo'
#0 0x0000000003cdab88 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3cdab88)
#1 0x0000000003cd855c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3cd855c)
#2 0x0000000003c1e468 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007d7d5fe42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000003525664 llvm::BasicBlock::getContext() const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3525664)
#5 0x000000000361789f llvm::BranchInst::BranchInst(llvm::BasicBlock*, llvm::User::AllocInfo, llvm::InsertPosition) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x361789f)
#6 0x00000000044dc98c clang::CodeGen::CodeGenFunction::PopCleanupBlock(bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x44dc98c)
#7 0x00000000044dcba9 clang::CodeGen::CodeGenFunction::PopCleanupBlocks(clang::CodeGen::EHScopeStack::stable_iterator, std::initializer_list<llvm::Value**>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x44dcba9)
#8 0x00000000041d69c5 clang::CodeGen::CodeGenFunction::FinishFunction(clang::SourceLocation) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x41d69c5)
#9 0x00000000041e80ec clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x41e80ec)
#10 0x0000000004245c5b clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4245c5b)
#11 0x0000000004240f04 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4240f04)
#12 0x0000000004241863 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4241863)
#13 0x000000000424bb2f clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#14 0x000000000459b4e1 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#15 0x00000000045863e9 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45863e9)
#16 0x00000000061c5c34 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x61c5c34)
#17 0x0000000004599785 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4599785)
#18 0x000000000489ae2a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x489ae2a)
#19 0x0000000004819d0b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4819d0b)
#20 0x000000000498f96b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x498f96b)
#21 0x0000000000dcda95 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdcda95)
#22 0x0000000000dc594b ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#23 0x0000000000dc59ed 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
#24 0x0000000004606ab9 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
#25 0x0000000003c1e883 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c1e883)
#26 0x0000000004606cd9 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
#27 0x00000000045c9662 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45c9662)
#28 0x00000000045ca541 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45ca541)
#29 0x00000000045d312c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45d312c)
#30 0x0000000000dca419 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdca419)
#31 0x0000000000c74c74 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc74c74)
#32 0x00007d7d5fe29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#33 0x00007d7d5fe29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#34 0x0000000000dc53e5 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdc53e5)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
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