C++ iterator::getName方法代码示例

/// \brief Duplicate non-Phi instructions from the beginning of block up to
/// StopAt instruction into a split block between BB and its predecessor.
BasicBlock *
llvm::DuplicateInstructionsInSplitBetween(BasicBlock *BB, BasicBlock *PredBB,
                                          Instruction *StopAt,
                                          ValueToValueMapTy &ValueMapping) {
  // We are going to have to map operands from the original BB block to the new
  // copy of the block 'NewBB'.  If there are PHI nodes in BB, evaluate them to
  // account for entry from PredBB.
  BasicBlock::iterator BI = BB->begin();
  for (; PHINode *PN = dyn_cast<PHINode>(BI); ++BI)
    ValueMapping[PN] = PN->getIncomingValueForBlock(PredBB);

  BasicBlock *NewBB = SplitEdge(PredBB, BB);
  NewBB->setName(PredBB->getName() + ".split");
  Instruction *NewTerm = NewBB->getTerminator();

  // Clone the non-phi instructions of BB into NewBB, keeping track of the
  // mapping and using it to remap operands in the cloned instructions.
  for (; StopAt != &*BI; ++BI) {
    Instruction *New = BI->clone();
    New->setName(BI->getName());
    New->insertBefore(NewTerm);
    ValueMapping[&*BI] = New;

    // Remap operands to patch up intra-block references.
    for (unsigned i = 0, e = New->getNumOperands(); i != e; ++i)
      if (Instruction *Inst = dyn_cast<Instruction>(New->getOperand(i))) {
        auto I = ValueMapping.find(Inst);
        if (I != ValueMapping.end())
          New->setOperand(i, I->second);
      }
  }

  return NewBB;
}

bool RemoveExtendsPass::runOnFunction(Function& f)
{
  CurrentFile::set(__FILE__);
  bool changed = false ;
  
  //see if there are any ROCCCNames or ROCCCSizes that caused the extend
  for(Function::iterator BB = f.begin(); BB != f.end(); ++BB)
  {
    begin:
    for(BasicBlock::iterator II = BB->begin(); II != BB->end(); ++II)
    {
      if( dynamic_cast<FPExtInst*>(&*II) or
          dynamic_cast<ZExtInst*>(&*II) or 
          dynamic_cast<SExtInst*>(&*II) or
          dynamic_cast<BitCastInst*>(&*II) )
      {
        INTERNAL_MESSAGE("Attempting to remove uses of " << II->getName() << "\n");
        for(Value::use_iterator UI = II->use_begin(); UI != II->use_end(); ++UI)
        {
          dynamic_cast<Instruction*>(*UI)->replaceUsesOfWith(II, II->getOperand(0));
          goto begin;
        }
        if( II->use_begin() == II->use_end() )
        {
          II->eraseFromParent();
          II = BB->begin();
        }
        else
        {
          INTERNAL_ERROR("Extend " << *II << " is still used in " << **II->use_begin() << "!");
          assert(0 and "Extend operation still exists!");
        }
      }
    }
  }

  return changed ;
}

// runOnFunction - Raise a function representation to a higher level.
bool RPR::runOnFunction(Function &F) {
  DEBUG(std::cerr << "\n\n\nStarting to work on Function '" << F.getName()
                  << "'\n");

  // Insert casts for all incoming pointer pointer values that are treated as
  // arrays...
  //
  bool Changed = false, LocalChange;

  // If the StartInst option was specified, then Peephole optimize that
  // instruction first if it occurs in this function.
  //
  if (!StartInst.empty()) {
    for (Function::iterator BB = F.begin(), BBE = F.end(); BB != BBE; ++BB)
      for (BasicBlock::iterator BI = BB->begin(); BI != BB->end(); ++BI)
        if (BI->getName() == StartInst) {
          bool SavedDebug = DebugFlag;  // Save the DEBUG() controlling flag.
          DebugFlag = true;             // Turn on DEBUG's
          Changed |= PeepholeOptimize(BB, BI);
          DebugFlag = SavedDebug;       // Restore DebugFlag to previous state
        }
  }

  do {
    DEBUG(std::cerr << "Looping: \n" << F);

    // Iterate over the function, refining it, until it converges on a stable
    // state
    LocalChange = false;
    while (DoRaisePass(F)) LocalChange = true;
    Changed |= LocalChange;

  } while (LocalChange);

  return Changed;
}

/// eliminateUnconditionalBranch - Clone the instructions from the destination
/// block into the source block, eliminating the specified unconditional branch.
/// If the destination block defines values used by successors of the dest
/// block, we may need to insert PHI nodes.
///
void TailDup::eliminateUnconditionalBranch(BranchInst *Branch) {
  BasicBlock *SourceBlock = Branch->getParent();
  BasicBlock *DestBlock = Branch->getSuccessor(0);
  assert(SourceBlock != DestBlock && "Our predicate is broken!");

  DEBUG(errs() << "TailDuplication[" << SourceBlock->getParent()->getName()
        << "]: Eliminating branch: " << *Branch);

  // See if we can avoid duplicating code by moving it up to a dominator of both
  // blocks.
  if (BasicBlock *DomBlock = FindObviousSharedDomOf(SourceBlock, DestBlock)) {
    DEBUG(errs() << "Found shared dominator: " << DomBlock->getName() << "\n");

    // If there are non-phi instructions in DestBlock that have no operands
    // defined in DestBlock, and if the instruction has no side effects, we can
    // move the instruction to DomBlock instead of duplicating it.
    BasicBlock::iterator BBI = DestBlock->getFirstNonPHI();
    while (!isa<TerminatorInst>(BBI)) {
      Instruction *I = BBI++;

      bool CanHoist = I->isSafeToSpeculativelyExecute() &&
                      !I->mayReadFromMemory();
      if (CanHoist) {
        for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op)
          if (Instruction *OpI = dyn_cast<Instruction>(I->getOperand(op)))
            if (OpI->getParent() == DestBlock ||
                (isa<InvokeInst>(OpI) && OpI->getParent() == DomBlock)) {
              CanHoist = false;
              break;
            }
        if (CanHoist) {
          // Remove from DestBlock, move right before the term in DomBlock.
          DestBlock->getInstList().remove(I);
          DomBlock->getInstList().insert(DomBlock->getTerminator(), I);
          DEBUG(errs() << "Hoisted: " << *I);
        }
      }
    }
  }

  // Tail duplication can not update SSA properties correctly if the values
  // defined in the duplicated tail are used outside of the tail itself.  For
  // this reason, we spill all values that are used outside of the tail to the
  // stack.
  for (BasicBlock::iterator I = DestBlock->begin(); I != DestBlock->end(); ++I)
    if (I->isUsedOutsideOfBlock(DestBlock)) {
      // We found a use outside of the tail.  Create a new stack slot to
      // break this inter-block usage pattern.
      DemoteRegToStack(*I);
    }

  // We are going to have to map operands from the original block B to the new
  // copy of the block B'.  If there are PHI nodes in the DestBlock, these PHI
  // nodes also define part of this mapping.  Loop over these PHI nodes, adding
  // them to our mapping.
  //
  std::map<Value*, Value*> ValueMapping;

  BasicBlock::iterator BI = DestBlock->begin();
  bool HadPHINodes = isa<PHINode>(BI);
  for (; PHINode *PN = dyn_cast<PHINode>(BI); ++BI)
    ValueMapping[PN] = PN->getIncomingValueForBlock(SourceBlock);

  // Clone the non-phi instructions of the dest block into the source block,
  // keeping track of the mapping...
  //
  for (; BI != DestBlock->end(); ++BI) {
    Instruction *New = BI->clone();
    New->setName(BI->getName());
    SourceBlock->getInstList().push_back(New);
    ValueMapping[BI] = New;
  }

  // Now that we have built the mapping information and cloned all of the
  // instructions (giving us a new terminator, among other things), walk the new
  // instructions, rewriting references of old instructions to use new
  // instructions.
  //
  BI = Branch; ++BI;  // Get an iterator to the first new instruction
  for (; BI != SourceBlock->end(); ++BI)
    for (unsigned i = 0, e = BI->getNumOperands(); i != e; ++i) {
      std::map<Value*, Value*>::const_iterator I =
        ValueMapping.find(BI->getOperand(i));
      if (I != ValueMapping.end())
        BI->setOperand(i, I->second);
    }

  // Next we check to see if any of the successors of DestBlock had PHI nodes.
  // If so, we need to add entries to the PHI nodes for SourceBlock now.
  for (succ_iterator SI = succ_begin(DestBlock), SE = succ_end(DestBlock);
       SI != SE; ++SI) {
    BasicBlock *Succ = *SI;
    for (BasicBlock::iterator PNI = Succ->begin(); isa<PHINode>(PNI); ++PNI) {
      PHINode *PN = cast<PHINode>(PNI);
      // Ok, we have a PHI node.  Figure out what the incoming value was for the
//.........这里部分代码省略.........

void HeterotbbTransform::edit_template_function (Module &M,Function* F,Function* new_join,GlobalVariable *old_gb,Value *gb) {

    SmallVector<Value*, 16> Args; // Argument lists to the new call
    vector<Instruction *> toDelete;
    //	old_gb->dump();
    //	gb->dump();
    Constant *Ids[2];

    for (Function::iterator BI=F->begin(),BE = F->end(); BI != BE; ++BI) {
        for (BasicBlock::iterator II = BI->begin(), IE = BI->end(); II != IE; ++II) {
            GetElementPtrInst *GEP;
            GlobalVariable *op;
            if (isa<CallInst>(II) || isa<InvokeInst>(II)) {
                CallSite CI(cast<Instruction>(II));
                //replace dummy reduce with new reduce
                if(CI.getCalledFunction()->getName().equals("__join_reduce_hetero")) {
                    Args.clear();
                    CastInst *newarg1 = CastInst::Create(Instruction::BitCast, CI.getArgument(0), new_join->arg_begin()->getType(), "arg1",CI.getInstruction());
                    Args.push_back(newarg1);
                    CastInst *newarg2 = CastInst::Create(Instruction::BitCast, CI.getArgument(1), new_join->arg_begin()->getType(), "arg2", CI.getInstruction());
                    Args.push_back(newarg2);

                    //no need to set attributes
                    Instruction *NewCall = CallInst::Create(new_join, Args, "", CI.getInstruction());
                    cast<CallInst>(NewCall)->setCallingConv(CI.getCallingConv());
                    toDelete.push_back(CI.getInstruction());
                    DEBUG(dbgs()<<"Joins Replaced\n");
                }
            }

            /*
            %arrayidx18 = getelementptr inbounds i32 addrspace(3)* getelementptr
            inbounds ([192 x i32] addrspace(3)* @opencl_kernel_join_name_local_arr, i32 0, i32 0),
            i64 %idxprom1
            */
            if((GEP = dyn_cast<GetElementPtrInst>(II)) /*&&
													   (op = dyn_cast<GlobalVariable>(GEP->getOperand(0)))*/ /*&&
													   (op->getName().equals("opencl_kernel_join_name_local_arr"))*/) {
                //II->dump();
                Value *val= II->getOperand(0);
                if(Constant *op=dyn_cast<ConstantExpr>(val)) {
                    //II->dump();
                    //II->getOperand(1)->dump();

                    /*Ids[0]=cast<Constant>(op->getOperand(1));
                    Ids[1]=cast<Constant>(op->getOperand(1));
                    Constant *new_op = ConstantExpr::getInBoundsGetElementPtr(cast<Constant>(gb),Ids,2);
                    new_op->dump();
                    Instruction *inst = GetElementPtrInst::CreateInBounds(new_op, II->getOperand(1), II->getName()+"_temp",II);
                    Value *Elts[] = {MDString::get(M.getContext(), "local_access")};
                    MDNode *Node = MDNode::get(M.getContext(), Elts);
                    inst->setMetadata("local_access",Node);
                    inst->dump();
                    II->replaceAllUsesWith(inst);
                    toDelete.push_back(II);
                    */

                    Value *Idxs[2] = {ConstantInt::get(Type::getInt32Ty(M.getContext()), 0),
                                      ConstantInt::get(Type::getInt32Ty(M.getContext()), 0)
                                     };
                    //gb->getType()->dump();
                    //gb->dump();
                    Instruction *inst_= GetElementPtrInst::CreateInBounds(gb, Idxs, /*Idxs+2,*/ II->getName()+"_temp_",II);
                    //inst_->dump();
                    Instruction *inst= GetElementPtrInst::CreateInBounds(inst_, II->getOperand(1), II->getName()+"_temp",II);
                    Value *Elts[] = {MDString::get(M.getContext(), inst->getName())};
                    MDNode *Node = MDNode::get(M.getContext(), Elts);
                    inst->setMetadata("local_access",Node);

                    //inst->dump();
                    II->replaceAllUsesWith(inst);
                    toDelete.push_back(II);

                }
            }
        }
    }
    while(!toDelete.empty()) {
        Instruction *g = toDelete.back();
        toDelete.pop_back();

        g->eraseFromParent();
    }

}

/// MoveExceptionValueCalls - Ensure that eh.exception is only ever called from
/// landing pads by replacing calls outside of landing pads with direct use of
/// a register holding the appropriate value; this requires adding calls inside
/// all landing pads to initialize the register.  Also, move eh.exception calls
/// inside landing pads to the start of the landing pad (optional, but may make
/// things simpler for later passes).
bool DwarfEHPrepare::MoveExceptionValueCalls() {
  // If the eh.exception intrinsic is not declared in the module then there is
  // nothing to do.  Speed up compilation by checking for this common case.
  if (!ExceptionValueIntrinsic &&
      !F->getParent()->getFunction(Intrinsic::getName(Intrinsic::eh_exception)))
    return false;

  bool Changed = false;

  // Move calls to eh.exception that are inside a landing pad to the start of
  // the landing pad.
  for (BBSet::const_iterator LI = LandingPads.begin(), LE = LandingPads.end();
       LI != LE; ++LI) {
    BasicBlock *LP = *LI;
    for (BasicBlock::iterator II = LP->getFirstNonPHIOrDbg(), IE = LP->end();
         II != IE;)
      if (EHExceptionInst *EI = dyn_cast<EHExceptionInst>(II++)) {
        // Found a call to eh.exception.
        if (!EI->use_empty()) {
          // If there is already a call to eh.exception at the start of the
          // landing pad, then get hold of it; otherwise create such a call.
          Value *CallAtStart = CreateExceptionValueCall(LP);

          // If the call was at the start of a landing pad then leave it alone.
          if (EI == CallAtStart)
            continue;
          EI->replaceAllUsesWith(CallAtStart);
        }
        EI->eraseFromParent();
        ++NumExceptionValuesMoved;
        Changed = true;
      }
  }

  // Look for calls to eh.exception that are not in a landing pad.  If one is
  // found, then a register that holds the exception value will be created in
  // each landing pad, and the SSAUpdater will be used to compute the values
  // returned by eh.exception calls outside of landing pads.
  SSAUpdater SSA;

  // Remember where we found the eh.exception call, to avoid rescanning earlier
  // basic blocks which we already know contain no eh.exception calls.
  bool FoundCallOutsideLandingPad = false;
  Function::iterator BB = F->begin();
  for (Function::iterator BE = F->end(); BB != BE; ++BB) {
    // Skip over landing pads.
    if (LandingPads.count(BB))
      continue;

    for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(), IE = BB->end();
         II != IE; ++II)
      if (isa<EHExceptionInst>(II)) {
        SSA.Initialize(II->getType(), II->getName());
        FoundCallOutsideLandingPad = true;
        break;
      }

    if (FoundCallOutsideLandingPad)
      break;
  }

  // If all calls to eh.exception are in landing pads then we are done.
  if (!FoundCallOutsideLandingPad)
    return Changed;

  // Add a call to eh.exception at the start of each landing pad, and tell the
  // SSAUpdater that this is the value produced by the landing pad.
  for (BBSet::iterator LI = LandingPads.begin(), LE = LandingPads.end();
       LI != LE; ++LI)
    SSA.AddAvailableValue(*LI, CreateExceptionValueCall(*LI));

  // Now turn all calls to eh.exception that are not in a landing pad into a use
  // of the appropriate register.
  for (Function::iterator BE = F->end(); BB != BE; ++BB) {
    // Skip over landing pads.
    if (LandingPads.count(BB))
      continue;

    for (BasicBlock::iterator II = BB->getFirstNonPHIOrDbg(), IE = BB->end();
         II != IE;)
      if (EHExceptionInst *EI = dyn_cast<EHExceptionInst>(II++)) {
        // Found a call to eh.exception, replace it with the value from any
        // upstream landing pad(s).
        EI->replaceAllUsesWith(SSA.GetValueAtEndOfBlock(BB));
        EI->eraseFromParent();
        ++NumExceptionValuesMoved;
      }
  }

  return true;
}