[llvm-dev] Running a dynamic shared library codeGen pass from clang

Thu Jan 14 14:21:54 PST 2021

You might want to use some ways to symbolize the stack trace. The most straight forward way might just be building clang and your Pass with debug info (e.g. -DCMAKE_BUILD_TYPE=Debug when invoking the cmake for building LLVM).

After that you can figure out the problem by either looking at the stack trace or using debuggers like gdb.

-Min

> On Jan 14, 2021, at 1:03 PM, Omar Ahmed via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi,
> 
> I was trying to run a custom pass built as a shared library codeGen pass but it keeps giving me this error msg:
> 
> ```
> fatal error: error in backend: Trying to construct TargetPassConfig without a target machine. Scheduling a CodeGen pass without a target triple set?
> PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
> Stack dump:
> 0.    Program arguments: clang-12 -target x86_64-unknown-linux-gnu -mcpu=x86_64 -O2 -fstack-protector-all -Xclang -load -Xclang ./libShadowStack.so -S test.c
> 1.    <eof> parser at end of file
> Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamEi+0x23)[0x7fd8a6747303]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm3sys17RunSignalHandlersEv+0x50)[0x7fd8a6745640]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm3sys15CleanupOnSignalEm+0xdd)[0x7fd8a6746a5d]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(+0xa4b72a)[0x7fd8a669972a]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(+0xa4b6cb)[0x7fd8a66996cb]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm3sys7Process4ExitEib+0x27)[0x7fd8a67424d7]
> clang-12[0x412bc0]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm18report_fatal_errorERKNS_5TwineEb+0x122)[0x7fd8a66a5102]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(+0xa56fd6)[0x7fd8a66a4fd6]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(+0xfbdd6e)[0x7fd8a6c0bd6e]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(+0xfc0bd3)[0x7fd8a6c0ebd3]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm17PMTopLevelManager12schedulePassEPNS_4PassE+0x17b)[0x7fd8a686ebdb]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm17PMTopLevelManager12schedulePassEPNS_4PassE+0x13d)[0x7fd8a686eb9d]
> ./libShadowStack.so(+0x11268)[0x7fd8a3ecf268]
> ./libShadowStack.so(_ZNSt17_Function_handlerIFvRKN4llvm18PassManagerBuilderERNS0_6legacy15PassManagerBaseEEPS7_E9_M_invokeERKSt9_Any_dataS3_S6_+0x49)[0x7fd8a3ed2b0e]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZNK4llvm18PassManagerBuilder17addExtensionsToPMENS0_16ExtensionPointTyERNS_6legacy15PassManagerBaseE+0xdf)[0x7fd8a758225f]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm18PassManagerBuilder25populateModulePassManagerERNS_6legacy15PassManagerBaseE+0xa71)[0x7fd8a7583991]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZN5clang17EmitBackendOutputERNS_17DiagnosticsEngineERKNS_19HeaderSearchOptionsERKNS_14CodeGenOptionsERKNS_13TargetOptionsERKNS_11LangOptionsERKN4llvm10DataLayoutEPNSE_6ModuleENS_13BackendActionESt10unique_ptrINSE_17raw_pwrite_streamESt14default_deleteISM_EE+0x260c)[0x7fd8ac54cc5c]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(+0x180b42f)[0x7fd8ac80e42f]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZN5clang8ParseASTERNS_4SemaEbb+0x244)[0x7fd8ab931f14]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZN5clang14FrontendAction7ExecuteEv+0x48)[0x7fd8acec88c8]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZN5clang16CompilerInstance13ExecuteActionERNS_14FrontendActionE+0x841)[0x7fd8ace7bbc1]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZN5clang25ExecuteCompilerInvocationEPNS_16CompilerInstanceE+0x582)[0x7fd8acf2c012]
> clang-12(_Z8cc1_mainN4llvm8ArrayRefIPKcEES2_Pv+0x5fb)[0x41258b]
> clang-12[0x410d3e]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(+0x1b96662)[0x7fd8acb99662]
> /usr/lib/x86_64-linux-gnu/libLLVM-12.so.1(_ZN4llvm20CrashRecoveryContext9RunSafelyENS_12function_refIFvvEEE+0xdd)[0x7fd8a66996ad]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZNK5clang6driver10CC1Command7ExecuteEN4llvm8ArrayRefINS2_8OptionalINS2_9StringRefEEEEEPNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPb+0x139)[0x7fd8acb98e49]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZNK5clang6driver11Compilation14ExecuteCommandERKNS0_7CommandERPS3_+0x17f)[0x7fd8acb6edff]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZNK5clang6driver11Compilation11ExecuteJobsERKNS0_7JobListERN4llvm15SmallVectorImplISt4pairIiPKNS0_7CommandEEEE+0x77)[0x7fd8acb6f1b7]
> /usr/lib/x86_64-linux-gnu/libclang-cpp.so.12(_ZN5clang6driver6Driver18ExecuteCompilationERNS0_11CompilationERN4llvm15SmallVectorImplISt4pairIiPKNS0_7CommandEEEE+0xdc)[0x7fd8acb83bec]
> clang-12(main+0x24cd)[0x4105fd]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fd8a4fa0840]
> clang-12(_start+0x29)[0x40de49]
> clang: error: clang frontend command failed with exit code 70 (use -v to see invocation)
> Ubuntu clang version 12.0.0-++20201209080817+199ec40e7bc-1~exp1~20201209191501.3386
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /usr/bin
> clang: note: diagnostic msg: 
> ********************
> ```
> 
> I register my pass with this code:
> 
> ```
> static void registerMyPass(const PassManagerBuilder &Builder, PassManagerBase &PM) {
>     PM.add(new ShadowStack());
> }
> static RegisterStandardPasses RegisterMyPass(PassManagerBuilder::EP_OptimizerLast, registerMyPass);
> ```
> 
> and I run my pass with this command line:
> 
> clang-12 -target x86_64-unknown-linux-gnu -mcpu=x86_64 -O2 -fstack-protector-all -Xclang -load -Xclang ./libShadowStack.so -S test.c
> 
> 
> I can't understand what is the problem here, So any help would be appreciated.
> 
> Thanks in advance
> Omar Ahmed
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

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