[LLVMdev] Something wrong with my libpthread.so

[Mahadevan R]

Hi,

On Sat, Oct 31, 2009 at 11:42 AM, Nan Zhu <zhunansjtu at gmail.com> wrote:
> Hi,all
>
> I tried to run the generated whole-program bitcode of BIND,but I got some
> information:
>
> 0   lli             0x0000000000feda16
> 1   lli             0x0000000000fed88f
> 2   libpthread.so.0 0x0000003df340eee0
> 3   libc.so.6       0x0000003df28332f5 gsignal + 53
> 4   libc.so.6       0x0000003df2834b20 abort + 384
> 5   libc.so.6       0x0000003df282c2fa __assert_fail + 234
> 6   lli             0x000000000085ece9
> llvm::SmallVectorImpl<llvm::Instruction*>::operator[](unsigned int) + 77
> 7   lli             0x0000000000850ce0
> llvm::BitcodeReader::ParseMetadataAttachment() + 448
> 8   lli             0x0000000000851043

Looks like a bug in the following piece of code, from
BitcodeReader::ParseMetadataAttachment():

  1601	    case bitc::METADATA_ATTACHMENT: {
  1602	      unsigned RecordLength = Record.size();
  1603	      if (Record.empty() || (RecordLength - 1) % 2 == 1)
  1604	        return Error ("Invalid METADATA_ATTACHMENT reader!");
  1605	      Instruction *Inst = InstructionList[Record[0]];
  1606	      for (unsigned i = 1; i != RecordLength; i = i+2) {
  1607	        unsigned Kind = Record[i];
  1608	        Value *Node = MDValueList.getValueFwdRef(Record[i+1]);
  1609	        TheMetadata.addMD(Kind, cast<MDNode>(Node), Inst);
  1610	      }
  1611	      break;
  1612	    }

At line 1606, i never becomes equal to RecordLength.

Regards,
-Mahadevan.