[LLVMdev] cs326 mp help

[kiyancla at uiuc.edu]

Hi,

First, please send any replies to me separately, as I am not
on the list.

I'm trying to run a very simple LLVM pass as a start on a
class project.  It compiles fine, but I get a runtime
assertion when running the pass.  I'll paste the error and cpp
file below, but basically I'm being told that I haven't
specified a required pass.  However, I've looked at some
example files, and i _think_ I'm doing stuff right.  Do I have
to run the getAnalysisUsage function manually (I'm subclassing
FunctionPass), or can I trust it's called before runOnFunction
if I implement it?

Any help is greatly appreciated,

Nadir Kiyanclar
kiyancla at uiuc.edu

The command I use (licm is the pass I'm writing)
=========================
opt -load ../../../lib/Debug/liblicm.so -licm < loop1.bc >
loop1.aftermypass.bc

The assertion:
======================================
opt:
/usr/dcs/csil-linux/projects/cs326/kiyancla/llvm/include/llvm/Pass.h:182:
AnalysisType& llvm::Pass::getAnalysisID(const llvm::PassInfo*)
const [with AnalysisType = llvm::LoopInfo]: Assertion `i !=
AnalysisImpls.size() && "getAnalysis*() called on an analysis
that we not " "'required' by pass!"' failed.
Aborted (core dumped)


finally, the cpp file: (sorry about the extraneous includes)
==================================
#include "llvm/Transforms/Scalar.h"
#include "llvm/Function.h"
#include "llvm/Pass.h"
#include "llvm/PassAnalysisSupport.h"
#include "llvm/Function.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Support/CFG.h"
#include "llvm/Module.h"
#include "llvm/Instruction.h"
#include "Support/PostOrderIterator.h"

#include <iostream>

using namespace llvm;

namespace {
  class  LICM : public FunctionPass
  {
  public:
        void getAnalysisUsage(AnalysisUsage &AU){
                AU.setPreservesCFG();
                AU.addRequiredID(LoopSimplifyID);
                AU.addRequired<DominatorTree>();
                AU.addRequired<LoopInfo>();
        }

        bool runOnFunction(Function &F);
  };

  RegisterOpt<LICM> Z("licm","Nadir Kiyanclar's code motion
pass for cs326, MP3");



  bool LICM::runOnFunction(Function &F){
        LoopInfo &LI = getAnalysis<LoopInfo>();
        return false;

  }
}