LLVM segmentation fault with opt command

Question

when i am trying to run the very simple (Hello world) pass given in llvm (my file is pass Hello.cpp) on a file XX.c (X64 OS) the opt command

opt -load ../../../Release+Asserts/lib/Hello.so -hello vv.bc > vv.txt

gives this error

0  libLLVM-3.2svn.so 0x00007f314b0f1e52
1  libLLVM-3.2svn.so 0x00007f314b0f22b3

2  libpthread.so.0   0x00007f314a0c7340

3  libstdc++.so.6    0x00007f31499645cb std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&) + 11

4  libLLVM-3.2svn.so 0x00007f314aadef1d llvm::createPrintFunctionPass(std::string const&, llvm::raw_ostream*, bool) + 77

5  libLLVM-3.2svn.so 0x00007f314aad1585 llvm::PMTopLevelManager::schedulePass(llvm::Pass*) + 37

6  opt               0x0000000000413e4f main + 4767

7  libc.so.6         0x00007f31492eeec5 __libc_start_main + 245

8 opt 0x000000000040dfcaStack dump:

0.  Program arguments: opt -load ../../../Release+Asserts/lib/Hello.so -hello vv.bc

Segmentation fault (core dumped)

any suggestion would be appreciable. I am new to both Linux and llvm

Oak · Accepted Answer · 2014-08-10 17:58:57Z

1

Something I found extremely useful is to use the verifier pass.

So first, make sure basic opt flow works as intended, and that the input file is legal:

opt -verify vv.bc -o out.bc

Then make sure your pass results in a legal module:

opt -load ../../../Release+Asserts/lib/Hello.so -hello -verify vv.bc -o out.bc

If that still won't help, I'd fire up the debugger.

answered Aug 10, 2014 at 17:58

Oak

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2 Comments

techcomp Over a year ago

opt -verify vv.bc -o out.bc worked fine but opt -load ../../../Release+Asserts/lib/Hello.so -hello -verify vv.bc -o out.bc is giving the same error

Oak Over a year ago

@techcomp bummer. I'd open a debugger and try to locate the issue.

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