problem with compiling target with symcc/sym++ compiler

[samstack6]

Hi .
I am trying to compile a target. I compiled and made symcc with LLVM-10 and also made the libcxx of it with symcc .

But I have the following problem when I want to compile a target source code with symcc :

Symbolizing function PredictorSub2_C
Symbolizing function PredictorSub3_C
Symbolizing function PredictorSub4_C
Symbolizing function PredictorSub5_C
Symbolizing function PredictorSub6_C
Symbolizing function PredictorSub7_C
Symbolizing function PredictorSub8_C
Symbolizing function PredictorSub9_C
Symbolizing function PredictorSub10_C
Symbolizing function PredictorSub11_C
Symbolizing function PredictorSub12_C
Symbolizing function PredictorSub13_C
Symbolizing function BitsLog2Floor
Warning: losing track of symbolic expressions at bit-count operation   %8 = call i32 @llvm.ctlz.i32(i32 %7, i1 true)
Symbolizing function GetEntropyUnrefinedHelper
Symbolizing function VP8LSubPixels
  CC       libwebpdsp_la-ssim.lo
Symbolizer module init
Symbolizing function VP8SSIMFromStats
Symbolizing function SSIMCalculation
Symbolizing function VP8SSIMFromStatsClipped
Symbolizing function VP8SSIMDspInit
Symbolizing function VP8SSIMDspInit_body
Symbolizing function SSIMGetClipped_C
Symbolizing function SSIMGet_C
Symbolizing function AccumulateSSE_C
  CC       libwebpdsp_sse2_la-cost_sse2.lo
Symbolizer module init
Symbolizing function VP8EncDspCostInitSSE2
Symbolizing function SetResidualCoeffs_SSE2
clang: /home/usse/symcc/compiler/Symbolizer.cpp:608: void Symbolizer::visitBitCastInst(llvm::BitCastInst&): Assertion `I.getSrcTy()->isPointerTy() && I.getDestTy()->isPointerTy() && "Unhandled non-pointer bit cast"' failed.
Stack dump:
0.      Program arguments: /home/usse/llvm-10/build/bin/clang -Xclang -load -Xclang /home/usse/symcc/build/libSymbolize.so -DHAVE_CONFIG_H -I. -I../../src/webp -I../.. -I../.. -fvisibility=hidden -Wall -Wconstant-conversion -Wdeclaration-after-statement -Wextra -Wfloat-conversion -Wformat -Wformat-nonliteral -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wold-style-definition -Wparentheses-equality -Wshadow -Wshorten-64-to-32 -Wundef -Wunreachable-code-aggressive -Wunreachable-code -Wunused -Wvla -msse2 -DWEBP_MAX_IMAGE_SIZE=838860800 -pthread -MT libwebpdsp_sse2_la-cost_sse2.lo -MD -MP -MF .deps/libwebpdsp_sse2_la-cost_sse2.Tpo -c cost_sse2.c -o libwebpdsp_sse2_la-cost_sse2.o -L/home/usse/symcc/build/SymRuntime-prefix/src/SymRuntime-build -lSymRuntime -Wl,-rpath,/home/usse/symcc/build/SymRuntime-prefix/src/SymRuntime-build -Qunused-arguments 
1.      <eof> parser at end of file
2.      Per-module optimization passes
3.      Running pass 'Function Pass Manager' on module 'cost_sse2.c'.
4.      Running pass 'Symbolization Pass' on function '@SetResidualCoeffs_SSE2'
 #0 0x00007f3eea78d35a llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x70835a)
 #1 0x00007f3eea78af44 llvm::sys::RunSignalHandlers() (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x705f44)
 #2 0x00007f3eea78b1b5 llvm::sys::CleanupOnSignal(unsigned long) (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x7061b5) #3 0x00007f3eea6ac780 CrashRecoverySignalHandler(int) (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x627780)
 #4 0x00007f3ee994a040 (/lib/x86_64-linux-gnu/libc.so.6+0x3f040)
 #5 0x00007f3ee9949fb7 raise /build/glibc-S9d2JN/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #6 0x00007f3ee994b921 abort /build/glibc-S9d2JN/glibc-2.27/stdlib/abort.c:81:0
 #7 0x00007f3ee993b48a __assert_fail_base /build/glibc-S9d2JN/glibc-2.27/assert/assert.c:89:0
 #8 0x00007f3ee993b502 (/lib/x86_64-linux-gnu/libc.so.6+0x30502)
 #9 0x00007f3ee8898889 Symbolizer::visitBitCastInst(llvm::BitCastInst&) (/home/usse/symcc/build/libSymbolize.so+0x57889)
#10 0x00007f3ee88b325f llvm::InstVisitor<Symbolizer, void>::visitBitCast(llvm::BitCastInst&) (/home/usse/symcc/build/libSymbolize.so+0x7225f)
#11 0x00007f3ee88b25d9 llvm::InstVisitor<Symbolizer, void>::visit(llvm::Instruction&) (/home/usse/symcc/build/libSymbolize.so+0x715d9)
#12 0x00007f3ee88b1a49 llvm::InstVisitor<Symbolizer, void>::visit(llvm::Instruction*) (/home/usse/symcc/build/libSymbolize.so+0x70a49)
#13 0x00007f3ee88b09b5 SymbolizePass::runOnFunction(llvm::Function&) (/home/usse/symcc/build/libSymbolize.so+0x6f9b5)
#14 0x00007f3eea89bf6f llvm::FPPassManager::runOnFunction(llvm::Function&) (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x816f6f)
#15 0x00007f3eea89c741 llvm::FPPassManager::runOnModule(llvm::Module&) (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x817741)
#16 0x00007f3eea89cb41 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x817b41)
#17 0x00007f3eee4a7861 (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1450861)
#18 0x00007f3eee4a92db clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, 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> >) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x14522db)
#19 0x00007f3eee775eac clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x171eeac)
#20 0x00007f3eed856039 clang::ParseAST(clang::Sema&, bool, bool) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x7ff039)
#21 0x00007f3eeef5ce09 clang::FrontendAction::Execute() (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1f05e09)
#22 0x00007f3eeef1aaba clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1ec3aba)
#23 0x00007f3eeefe72cb clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1f902cb)
#24 0x0000563bc9bd1cf7 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/usse/llvm-10/build/bin/clang+0x11cf7)
#25 0x0000563bc9bcf5ad ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) (/home/usse/llvm-10/build/bin/clang+0xf5ad)#26 0x00007f3eeec2ae05 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, bool*) const::'lambda'()>(long) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1bd3e05)
#27 0x00007f3eea6ac863 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/usse/llvm-10/build/lib/libLLVM-10.so+0x627863)
#28 0x00007f3eeec2ba70 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, bool*) const (.part.148) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1bd4a70)
#29 0x00007f3eeec04635 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1bad635)
#30 0x00007f3eeec05091 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1bae091)
#31 0x00007f3eeec0f345 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) (/home/usse/llvm-10/build/lib/libclang-cpp.so.10+0x1bb8345)
#32 0x0000563bc9bcd4bc main (/home/usse/llvm-10/build/bin/clang+0xd4bc)
#33 0x00007f3ee992cbf7 __libc_start_main /build/glibc-S9d2JN/glibc-2.27/csu/../csu/libc-start.c:344:0
#34 0x0000563bc9bcf12a _start (/home/usse/llvm-10/build/bin/clang+0xf12a)
clang-10: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 10.0.1 
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/usse/llvm-10/build/bin
clang-10: note: diagnostic msg: PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
clang-10: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-10: note: diagnostic msg: /tmp/cost_sse2-2d8176.c
clang-10: note: diagnostic msg: /tmp/cost_sse2-2d8176.sh
clang-10: note: diagnostic msg: 

********************
Makefile:988: recipe for target 'libwebpdsp_sse2_la-cost_sse2.lo' failed
make[2]: *** [libwebpdsp_sse2_la-cost_sse2.lo] Error 1
make[2]: Leaving directory '/home/usse/libwebp/src/dsp'
Makefile:596: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/usse/libwebp/src'
Makefile:421: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1

Can anyone help? is something here is forgotten ? I even set SYMCC_LIBCXX_PATH to the right place :

export SYMCC_LIBCXX_PATH=~/llvm-10/libcxx_symcc_install/

Thanks!

[samstack6]

Any thoughts on this ?

[sebastianpoeplau]

Seems to be a bitcast instruction in the LLVM bitcode that we're not handling correctly. To debug what's going wrong, you could make SymCC print the bitcode that the verifier chokes on by uncommenting the line here and moving it a few lines up to the lines that print "Symbolizing function"; the code that handles bitcasts (and likely contains the bug) is here.

[aurelf]

Can you provide a minimal test case or do what's requested above?

[aurelf]

@samstack6: please feel free to repoen the bug with the information we asked.