[18 regression] PHINode should have one entry for each predecessor of its parent basic block! #85552
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The issue appears to still exist on trunk. |
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At a glance, the IR that codegen produces for |
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This is a clang codegen bug. |
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@llvm/issue-subscribers-clang-codegen Author: Bernhard Rosenkraenzer (berolinux)
```
$ clang++ -o test.o -c test.cc -O1
PHINode should have one entry for each predecessor of its parent basic block!
%2 = phi ptr [ poison, <null operand!> ], [ null, %dynamic_cast.null ]
fatal error: error in backend: Broken module found, compilation aborted!
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: clang++ -Wno-unused-value -o test.o -c test.cc -O1
1. <eof> parser at end of file
2. Optimizer
#0 0x00007f390239a576 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib64/libLLVM.so.18.1+0x459a576)
#1 0x00007f39023991ea llvm::sys::RunSignalHandlers() (/usr/lib64/libLLVM.so.18.1+0x45991ea)
#2 0x00007f39022b119d (/usr/lib64/libLLVM.so.18.1+0x44b119d)
#3 0x00007f39022b10ad llvm::CrashRecoveryContext::HandleExit(int) (/usr/lib64/libLLVM.so.18.1+0x44b10ad)
#4 0x00007f39023928bb (/usr/lib64/libLLVM.so.18.1+0x45928bb)
#5 0x0000556cde35771a (/usr/bin/clang-18+0x1771a)
#6 0x00007f39022c7747 llvm::report_fatal_error(llvm::Twine const&, bool) (/usr/lib64/libLLVM.so.18.1+0x44c7747)
#7 0x00007f39022c7606 (/usr/lib64/libLLVM.so.18.1+0x44c7606)
#8 0x00007f39026f6c17 (/usr/lib64/libLLVM.so.18.1+0x48f6c17)
#9 0x00007f390a7a0c8f (/usr/lib64/libclang-cpp.so.18.1+0x2da0c8f)
#10 0x00007f3902685407 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib64/libLLVM.so.18.1+0x4885407)
#11 0x00007f390a79345a (/usr/lib64/libclang-cpp.so.18.1+0x2d9345a)
#12 0x00007f390a78bd7b clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, 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*) (/usr/lib64/libclang-cpp.so.18.1+0x2d8bd7b)
#13 0x00007f390ac1a68f clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/usr/lib64/libclang-cpp.so.18.1+0x321a68f)
#14 0x00007f3909245246 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib64/libclang-cpp.so.18.1+0x1845246)
#15 0x00007f390b78285b clang::FrontendAction::Execute() (/usr/lib64/libclang-cpp.so.18.1+0x3d8285b)
#16 0x00007f390b6e6b09 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib64/libclang-cpp.so.18.1+0x3ce6b09)
#17 0x00007f390b801daa clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib64/libclang-cpp.so.18.1+0x3e01daa)
#18 0x0000556cde357036 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/bin/clang-18+0x17036)
#19 0x0000556cde352cef (/usr/bin/clang-18+0x12cef)
#20 0x00007f390b2c236b (/usr/lib64/libclang-cpp.so.18.1+0x38c236b)
#21 0x00007f39022b1033 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib64/libLLVM.so.18.1+0x44b1033)
#22 0x00007f390b2c2253 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (/usr/lib64/libclang-cpp.so.18.1+0x38c2253)
#23 0x00007f390b27aec7 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/usr/lib64/libclang-cpp.so.18.1+0x387aec7)
#24 0x00007f390b27b3de clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/usr/lib64/libclang-cpp.so.18.1+0x387b3de)
#25 0x00007f390b2bd91f clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/usr/lib64/libclang-cpp.so.18.1+0x38bd91f)
#26 0x0000556cde352265 clang_main(int, char**, llvm::ToolContext const&) (/usr/bin/clang-18+0x12265)
#27 0x0000556cde361f36 main (/usr/bin/clang-18+0x21f36)
#28 0x00007f38fd83dc0a (/usr/lib64/libc.so.6+0x29c0a)
#29 0x00007f38fd83dcc5 __libc_start_main (/usr/lib64/libc.so.6+0x29cc5)
#30 0x0000556cde34ee71 _start (/usr/bin/clang-18+0xee71)
clang++: error: clang frontend command failed with exit code 70 (use -v to see invocation)
```
Reduced test case: struct a {
virtual void b();
};
struct c {
a *operator*();
bool operator!=(c);
void operator++();
c begin();
c end();
} d;
template <typename e> void g() {
for (a *f : d)
dynamic_cast<e *>(f);
}
struct h final : protected a {};
void i() { g<h>; } |
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Reduced test case:
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