[LLVMdev] Segmentation Fault(Modifying BasicBlockPlacement.cpp)

[Chris Lattner]

On Mon, 7 Feb 2005, Tanu Sharma wrote:

> I have been trying to randomize blocks in a program and modified 
> "BasicBlockPlacement.cpp" for the purpose but getting segmentation 
> fault.I am not able to determine the problem.Can anyone please decrypt 
> these error messages or suggest what might be the possible cause of 
> failure?

I'd be happy to fix this, but I need a proper testcase and instructions to 
reproduce it.  Can you please send me the bytecode file and commands you 
are using to do this?

Also, have you tried out bugpoint?  Please give it a try first, as it will 
probably shrink the testcase down to something small.  You should be 
able to run it like:

bugpoint -block-placement -other-options-you-need test.bc

... and it should hopefully give you a smaller .bc file.  Regardless, if 
you send me the testcase, I'll fix the bug.

Thanks!

-Chris

> -----------------------------------------------------------------------------------------------------
>
> opt((anonymous namespace)::PrintStackTrace()+0x18)[0x8691968]
> opt((anonymous namespace)::SignalHandler(int)+0xd8)[0x8691bc8]
> /lib/tls/libc.so.6[0x688a48]
> opt(llvm::BasicBlock::getNext()+0x6)[0x83d36d0]
> opt(llvm::SymbolTableListTraits<llvm::BasicBlock, llvm::Function, llvm::Function, llvm::ilist_traits<llvm::BasicBlock> >::getNext(llvm::BasicBlock*)+0x11)[0x83d36c5]
> opt(llvm::ilist_iterator<llvm::BasicBlock>::operator++()+0x17)[0x83d011d]
> opt(llvm::ilist_iterator<llvm::BasicBlock>::operator++(int)+0x1c)[0x849c64e]
> /home/tsharma/ankur/llvm/Debug/lib/LLVMHello.so((anonymous namespace)::Hello::PlaceBlocks(llvm::BasicBlock*)+0x196)[0x115616]
> /home/tsharma/ankur/llvm/Debug/lib/LLVMHello.so((anonymous namespace)::Hello::runOnFunction(llvm::Function&)+0x68)[0x115450]
> opt(llvm::PassManagerTraits<llvm::Function>::runPass(llvm::FunctionPass*, llvm::Function*)+0x1b)[0x8645e0b]
> opt(llvm::PassManagerT<llvm::Function>::runOnUnit(llvm::Function*)+0x5c5)[0x8645739]
> opt(llvm::PassManagerTraits<llvm::Function>::runOnFunction(llvm::Function&)+0x1b)[0x86463af]
> opt(llvm::FunctionPass::runOnModule(llvm::Module&)+0xa4)[0x85ef606]
> opt(llvm::PassManagerTraits<llvm::Module>::runPass(llvm::ModulePass*, llvm::Module*)+0x1b)[0x8640f7b]
> opt(llvm::PassManagerT<llvm::Module>::runOnUnit(llvm::Module*)+0x5c5)[0x863ff8b]
> opt(llvm::PassManagerTraits<llvm::Module>::runOnModule(llvm::Module&)+0x1b)[0x8642f0d]
> opt(llvm::PassManager::run(llvm::Module&)+0x1f)[0x85ee965]
> opt(main+0x988)[0x83b225c]
> /lib/tls/libc.so.6(__libc_start_main+0xe3)[0x675e33]
> opt(__gxx_personality_v0+0x111)[0x83b1751]
> Segmentation fault
> ------------------------------------------------------------------------------------------------------
>
> Thanks
>
> Tanu
>
>
>
>
> ---------------------------------
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-Chris

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