[llvm-dev] Illegal instruction (core dumped) LLVM 8.0

[Mehdi AMINI via llvm-dev]

On Sun, Aug 25, 2019 at 12:36 PM hameeza ahmed via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello,
> I have implemented a pass to count total number of instructions in LLVM
> 8.0. Its source code is attached here. The pass runs fine with LLVM 4.0.
> But with LLVM 8.0 following error is shown;
>
> $ $LLVMopt_BIN/opt -load $LLVM_SO/LLVMStatic-Info.so -one output-simple.bc
> WARNING: You're attempting to print out a bitcode file.
> This is inadvisable as it may cause display problems. If
> you REALLY want to taste LLVM bitcode first-hand, you
> can force output with the `-f' option.
> %2+_Z5UsageiPPc 5 call:1,getelementptr:1,load:2,ret:1,
> _Z5UsageiPPc 5 5Stack dump:
> 0. Program arguments:opt -load /build/lib/LLVMStatic-Info.so -one
> output-simple.bc
> 1. Running pass 'Function Pass Manager' on module 'output-simple.bc'.
> 2. Running pass 'Numbers of Opcodes inside the program' on function
> '@_Z5UsageiPPc'
>  #0 0x0000000002636939 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
> /llvm-8.0.0.src/lib/Support/Unix/Signals.inc:495:11
>  #1 0x0000000002636ae9 PrintStackTraceSignalHandler(void*)
> /llvm-8.0.0.src/lib/Support/Unix/Signals.inc:559:1
>  #2 0x0000000002634bd6 llvm::sys::RunSignalHandlers()
> /llvm-8.0.0.src/lib/Support/Signals.cpp:68:5
>  #3 0x000000000263718b SignalHandler(int)
> /llvm-8.0.0.src/lib/Support/Unix/Signals.inc:358:1
>  #4 0x00007f9153c4f890 __restore_rt
> (/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
>  #5 0x00007f91524b40fe (anonymous
> namespace)::opcodecount::runOnFunction(llvm::Function&)
> /llvm-8.0.0.src/lib/Transforms/Static-Info/Static-Info.cpp:30:1
>  #6 0x0000000001c64464 llvm::FPPassManager::runOnFunction(llvm::Function&)
> /llvm-8.0.0.src/lib/IR/LegacyPassManager.cpp:1644:23
>  #7 0x0000000001c64845 llvm::FPPassManager::runOnModule(llvm::Module&)
> /llvm-8.0.0.src/lib/IR/LegacyPassManager.cpp:1679:16
>  #8 0x0000000001c6507b (anonymous
> namespace)::MPPassManager::runOnModule(llvm::Module&)
> /llvm-8.0.0.src/lib/IR/LegacyPassManager.cpp:1744:23
>  #9 0x0000000001c64b1b llvm::legacy::PassManagerImpl::run(llvm::Module&)
> /llvm-8.0.0.src/lib/IR/LegacyPassManager.cpp:1857:16
> #10 0x0000000001c65651 llvm::legacy::PassManager::run(llvm::Module&)
> /llvm-8.0.0.src/lib/IR/LegacyPassManager.cpp:1888:3
> #11 0x0000000000b54d93 main /llvm-8.0.0.src/tools/opt/opt.cpp:835:12
> #12 0x00007f91526dbb97 __libc_start_main
> /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
> #13 0x0000000000b0a5fa _start (/build/bin/opt+0xb0a5fa)
> Illegal instruction (core dumped)
>
> what is the reason of this error?
>

Can you try adding a return statement to your run() method? It is returning
a value and it is UB to not do so.

-- 
Mehdi
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20190825/e64cdfa5/attachment.html>