[LLVMdev] NEWBIE: deleting Instructions

[Heiko Sturzrehm]

Hello,

i just tried to write some passes and in one of them i want to delete a call
Instruction.
I can identify the specific Instruction without a problem, but when i put
the delete operation in the code i always get a error message while running
opt. I already tried to rename my pass, but without any change.

Another question i have is: why do i always get the "opt: CommandLine
Error:"  how can i fix it?

Thanks for any help.

Ciao Heiko

Console OUTPUT:
opt -load /home/sturzrehmh/llvm/llvm-1.9/Release/lib/TESTXYZ.so -TESTXYZ <
test.bc > test.bc2
opt: CommandLine Error: Argument 'track-memory' defined more than once!
opt: CommandLine Error: Argument 'info-output-file' defined more than once!
opt: CommandLine Error: Argument 'help' defined more than once!
opt: CommandLine Error: Argument 'help-hidden' defined more than once!
opt: CommandLine Error: Argument 'version' defined more than once!
opt: Pass.cpp:346: void llvm::RegisterPassBase::registerPass(): Assertion
`PassInfoMap->find(PIObj.getTypeInfo()) == PassInfoMap->end() && "Pass
already registered!"' failed.
Aborted

PASS:
virtual bool runOnFunction(Function &F) 
{
  bool change= false;

  Function* func = &F;
		
  for(Function::iterator it = func->begin(), ite = func ->end(); it!=ite ;
++it)
  {
    BasicBlock* blk =it;
    User* u;
    Value* val;
    std::string s1;
				
    for (BasicBlock::iterator i = blk->begin(), e = blk->end(); i != e ;
++i)
    {
      if(i->getOpcode()==33)
      {
        u = i;
        val=u->getOperand(0);
        s1 = val->getName();
        if(s1 == "_Z7startv")
        {
//HERE is the problem							
          blk->getInstList().erase(i);

          change=true;
        }
      }
    }
  }
  return change;
}
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