[llvm-dev] setDataLayout segfault

[Mehdi Amini via llvm-dev]

> On Sep 14, 2016, at 7:59 AM, Frank Winter via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> I get a segfault with this code when setting the data layout:
> 
> 
> 
> int main(int argc, char** argv)
> {
>  llvm::InitializeNativeTarget();
> 
>  llvm::LLVMContext TheContext;
>  unique_ptr<Module> Mod(new Module("A",TheContext));
> 
>  llvm::EngineBuilder engineBuilder(std::move(Mod));
>  std::string mcjit_error;
> 
>  engineBuilder.setMCPU(llvm::sys::getHostCPUName());
> 
>  engineBuilder.setEngineKind(llvm::EngineKind::JIT);
>  engineBuilder.setOptLevel(llvm::CodeGenOpt::Aggressive);
>  engineBuilder.setErrorStr(&mcjit_error);
> 
>  llvm::TargetOptions targetOptions;
>  targetOptions.AllowFPOpFusion = llvm::FPOpFusion::Fast;
>  engineBuilder.setTargetOptions( targetOptions );
> 
>  TargetMachine *targetMachine = engineBuilder.selectTarget();
> 
>  assert(targetMachine && "failed to create target machine");
> 
>  std::cout << targetMachine->createDataLayout().getStringRepresentation() << "\n";
> 
>  Mod.get()->setDataLayout( targetMachine->createDataLayout().getStringRepresentation() ); // this segfaults
>  Mod.get()->setDataLayout( targetMachine->createDataLayout()  ); // as well as this
> }
> 
> 
> Backtrace:
> 
> 
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> e-m:e-i64:64-f80:128-n8:16:32:64-S128
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff5f65832 in llvm::SmallVectorTemplateCommon<unsigned char, void>::end (this=0x148) at /home/fwinter/svn/llvm-3.9/include/llvm/ADT/SmallVector.h:117
> 117      iterator end() { return (iterator)this->EndX; }
> (gdb) bt
> #0  0x00007ffff5f65832 in llvm::SmallVectorTemplateCommon<unsigned char, void>::end (this=0x148) at /home/fwinter/svn/llvm-3.9/include/llvm/ADT/SmallVector.h:117
> #1  llvm::SmallVectorImpl<unsigned char>::clear (this=0x148) at /home/fwinter/svn/llvm-3.9/include/llvm/ADT/SmallVector.h:345
> #2  0x00007ffff5fa13b5 in llvm::DataLayout::clear (this=0x138) at /home/fwinter/svn/llvm-3.9/lib/IR/DataLayout.cpp:545
> #3  0x00007ffff5f9f561 in llvm::DataLayout::reset (this=0x138, Desc=...) at /home/fwinter/svn/llvm-3.9/lib/IR/DataLayout.cpp:179
> #4  0x00007ffff60b25ca in llvm::Module::setDataLayout (this=0x0,

The Module is a null pointer here.

— 
Mehdi


> #5  0x0000000000406c46 in main (argc=1, argv=0x7fffffffde68) at main.cc:95
> 
> 
> Any idea?
> 
> Frank
> 
> 
> 
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