https://llvm.org/bugs/show_bug.cgi?id=28636
Bug ID: 28636 Summary: clang crashes on valid code at -O1 and above on x86_64-linux-gnu (in pass 'Combine redundant instructions'): Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed Product: clang Version: trunk Hardware: PC OS: All Status: NEW Severity: normal Priority: P Component: -New Bugs Assignee: unassignedclangb...@nondot.org Reporter: s...@cs.ucdavis.edu CC: llvm-bugs@lists.llvm.org Classification: Unclassified The current clang trunk crashes when compiling the following test case on x86_64-linux-gnu at -O1 and above in both 32-bit and 64-bit modes. This is a regression from 3.8.x. $ clang -v clang version 4.0.0 (trunk 276092) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/clang-trunk/bin Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9 Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3 Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5 Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Candidate multilib: x32;@mx32 Selected multilib: .;@m64 $ $ clang -O0 -c small.c $ clang-3.8 -O1 -c small.c $ $ clang -O1 -c small.c clang-4.0: /tmp/llvm-builder/llvm-source-trunk/include/llvm/Support/Casting.h:223: typename std::enable_if<(! llvm::is_simple_type<Y>::value), typename llvm::cast_retty<X, const Y>::ret_type>::type llvm::cast(const Y&) [with X = llvm::PHINode; Y = llvm::ilist_iterator<llvm::Instruction>; typename std::enable_if<(! llvm::is_simple_type<Y>::value), typename llvm::cast_retty<X, const Y>::ret_type>::type = llvm::PHINode*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed. #0 0x0000000001d8fa95 llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/usr/local/clang-trunk/bin/clang-4.0+0x1d8fa95) #1 0x0000000001d8db4e llvm::sys::RunSignalHandlers() (/usr/local/clang-trunk/bin/clang-4.0+0x1d8db4e) #2 0x0000000001d8dcb0 SignalHandler(int) (/usr/local/clang-trunk/bin/clang-4.0+0x1d8dcb0) #3 0x00007f8a7b833340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340) #4 0x00007f8a7a624cc9 gsignal /build/eglibc-3GlaMS/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0 #5 0x00007f8a7a6280d8 abort /build/eglibc-3GlaMS/eglibc-2.19/stdlib/abort.c:91:0 #6 0x00007f8a7a61db86 __assert_fail_base /build/eglibc-3GlaMS/eglibc-2.19/assert/assert.c:92:0 #7 0x00007f8a7a61dc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32) #8 0x0000000001af68c0 llvm::InstCombiner::visitPHINode(llvm::PHINode&) (/usr/local/clang-trunk/bin/clang-4.0+0x1af68c0) #9 0x0000000001aa36a7 llvm::InstCombiner::run() (/usr/local/clang-trunk/bin/clang-4.0+0x1aa36a7) #10 0x0000000001aa43b0 combineInstructionsOverFunction(llvm::Function&, llvm::InstCombineWorklist&, llvm::AAResults*, llvm::AssumptionCache&, llvm::TargetLibraryInfo&, llvm::DominatorTree&, bool, llvm::LoopInfo*) (/usr/local/clang-trunk/bin/clang-4.0+0x1aa43b0) #11 0x0000000001aa4758 llvm::InstructionCombiningPass::runOnFunction(llvm::Function&) (/usr/local/clang-trunk/bin/clang-4.0+0x1aa4758) #12 0x00000000019e8403 llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/local/clang-trunk/bin/clang-4.0+0x19e8403) #13 0x00000000019e8a0b llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/local/clang-trunk/bin/clang-4.0+0x19e8a0b) #14 0x0000000001efc44a clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >) (/usr/local/clang-trunk/bin/clang-4.0+0x1efc44a) #15 0x000000000252517f clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/usr/local/clang-trunk/bin/clang-4.0+0x252517f) #16 0x000000000289369d clang::ParseAST(clang::Sema&, bool, bool) (/usr/local/clang-trunk/bin/clang-4.0+0x289369d) #17 0x00000000025254fe clang::CodeGenAction::ExecuteAction() (/usr/local/clang-trunk/bin/clang-4.0+0x25254fe) #18 0x00000000022300de clang::FrontendAction::Execute() (/usr/local/clang-trunk/bin/clang-4.0+0x22300de) #19 0x00000000022058d6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/local/clang-trunk/bin/clang-4.0+0x22058d6) #20 0x00000000022be422 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/local/clang-trunk/bin/clang-4.0+0x22be422) #21 0x0000000000b18c38 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/local/clang-trunk/bin/clang-4.0+0xb18c38) #22 0x0000000000ac7637 main (/usr/local/clang-trunk/bin/clang-4.0+0xac7637) #23 0x00007f8a7a60fec5 __libc_start_main /build/eglibc-3GlaMS/eglibc-2.19/csu/libc-start.c:321:0 #24 0x0000000000b14c64 _start (/usr/local/clang-trunk/bin/clang-4.0+0xb14c64) Stack dump: 0. Program arguments: /usr/local/clang-trunk/bin/clang-4.0 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c -mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb -coverage-file /data2/small.c -resource-dir /usr/local/clang-trunk/bin/../lib/clang/4.0.0 -internal-isystem /usr/local/include -internal-isystem /usr/local/clang-trunk/bin/../lib/clang/4.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir /data2 -ferror-limit 19 -fmessage-length 224 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o small.o -x c small.c 1. <eof> parser at end of file 2. Per-module optimization passes 3. Running pass 'Function Pass Manager' on module 'small.c'. 4. Running pass 'Combine redundant instructions' on function '@fn1' clang-4.0: error: unable to execute command: Aborted (core dumped) clang-4.0: error: clang frontend command failed due to signal (use -v to see invocation) clang version 4.0.0 (trunk 276092) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/clang-trunk/bin clang-4.0: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script. clang-4.0: note: diagnostic msg: ******************** PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang-4.0: note: diagnostic msg: /tmp/small-70026e.c clang-4.0: note: diagnostic msg: /tmp/small-70026e.sh clang-4.0: note: diagnostic msg: ******************** $ ----------------------------------------- struct S { int f0; long f1; int f2; }; int a; struct S fn1 () { struct S b = { 0, 0, 0 }; for (; a;) { struct S c; for (; 1;) { a = b.f0; for (; a;) c = b; if (a) { int d; return c; } return c; } } return b; } -- You are receiving this mail because: You are on the CC list for the bug.
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