| Issue |
123884
|
| Summary |
[clang] Crash at -O1
|
| Labels |
|
| Assignees |
|
| Reporter |
cardigan1008
|
This code crashes at `-O1`:
```c
int a, b, c;
unsigned char d;
short e;
int f(long g, int h) {
switch (b) {
case 2:
return g;
default:
return *(int *)(h + g * sizeof(int));
}
}
void i(long);
void j() {
e = d >> a;
i(e);
}
void i(long g) { c = f(g + 4, g); }
int main() {}
```
Compiler Explorer: https://godbolt.org/z/6dWc1cPcb
Bisected to https://github.com/llvm/llvm-project/commit/40d952b8748bf5c4a97fc82296e1fc050388472f, which was committed by @fhahn
No crash info.
Backtrace:
```console
0. Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang -gdwarf-4 -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 -O1 -Wall -Wextra <source>
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '<source>'.
4. Running pass 'Live Variable Analysis' on function '@j'
#0 0x0000000003a8ded8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3a8ded8)
#1 0x0000000003a8c024 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3a8c024)
#2 0x00000000039db3a8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000070a531442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000002dff8eb llvm::LiveVariables::HandleVirtRegUse(llvm::Register, llvm::MachineBasicBlock*, llvm::MachineInstr&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x2dff8eb)
#5 0x0000000002e0000c llvm::LiveVariables::runOnInstr(llvm::MachineInstr&, llvm::SmallVectorImpl<llvm::Register>&, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/clang+0x2e0000c)
#6 0x0000000002e00bf4 llvm::LiveVariables::runOnBlock(llvm::MachineBasicBlock*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/clang+0x2e00bf4)
#7 0x0000000002e01b22 llvm::LiveVariables::analyze(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x2e01b22)
#8 0x0000000002e01f6d llvm::LiveVariablesWrapperPass::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x2e01f6d)
#9 0x0000000002e9acd5 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#10 0x00000000033f3f82 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x33f3f82)
#11 0x00000000033f4211 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x33f4211)
#12 0x00000000033f5b79 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x33f5b79)
#13 0x0000000003d30a85 clang::emitBackendOutput(clang::CompilerInstance&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3d30a85)
#14 0x00000000043d90e8 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x43d90e8)
#15 0x000000000630885c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+0x630885c)
#16 0x00000000043d9805 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+0x43d9805)
#17 0x00000000046b3341 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+0x46b3341)
#18 0x0000000004632d6b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x4632d6b)
#19 0x000000000479d933 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+0x479d933)
#20 0x0000000000d10521 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+0xd10521)
#21 0x0000000000d08d1d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#22 0x0000000004425109 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
#23 0x00000000039db7d3 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+0x39db7d3)
#24 0x0000000004425329 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
#25 0x00000000043e942d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+0x43e942d)
#26 0x00000000043ea3c1 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+0x43ea3c1)
#27 0x00000000043f475c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x43f475c)
#28 0x0000000000d0d1b1 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+0xd0d1b1)
#29 0x0000000000bd37f4 main (/opt/compiler-explorer/clang-trunk/bin/clang+0xbd37f4)
#30 0x000070a531429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#31 0x000070a531429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#32 0x0000000000d087b5 _start (/opt/compiler-explorer/clang-trunk/bin/clang+0xd087b5)
```
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