C++ IntrinsicInst::getCallingConv方法代码示例

//.........这里部分代码省略.........
    if (!URoR) return CleanupSelectors(CatchAllSels);
  }

  SmallPtrSet<InvokeInst*, 32> URoRInvokes;
  FindAllURoRInvokes(URoRInvokes);

  SmallPtrSet<IntrinsicInst*, 32> SelsToConvert;

  for (SmallPtrSet<IntrinsicInst*, 32>::iterator
         SI = Sels.begin(), SE = Sels.end(); SI != SE; ++SI) {
    const BasicBlock *SelBB = (*SI)->getParent();
    for (SmallPtrSet<InvokeInst*, 32>::iterator
           UI = URoRInvokes.begin(), UE = URoRInvokes.end(); UI != UE; ++UI) {
      const BasicBlock *URoRBB = (*UI)->getParent();
      if (DT->dominates(SelBB, URoRBB)) {
        SelsToConvert.insert(*SI);
        break;
      }
    }
  }

  bool Changed = false;

  if (Sels.size() != SelsToConvert.size()) {
    // If we haven't been able to convert all of the clean-up selectors, then
    // loop through the slow way to see if they still need to be converted.
    if (!ExceptionValueIntrinsic) {
      ExceptionValueIntrinsic =
        Intrinsic::getDeclaration(F->getParent(), Intrinsic::eh_exception);
      if (!ExceptionValueIntrinsic)
        return CleanupSelectors(CatchAllSels);
    }

    for (Value::use_iterator
           I = ExceptionValueIntrinsic->use_begin(),
           E = ExceptionValueIntrinsic->use_end(); I != E; ++I) {
      IntrinsicInst *EHPtr = dyn_cast<IntrinsicInst>(*I);
      if (!EHPtr || EHPtr->getParent()->getParent() != F) continue;

      Changed |= PromoteEHPtrStore(EHPtr);

      bool URoRInvoke = false;
      SmallPtrSet<IntrinsicInst*, 8> SelCalls;
      Changed |= FindSelectorAndURoR(EHPtr, URoRInvoke, SelCalls);

      if (URoRInvoke) {
        // This EH pointer is being used by an invoke of an URoR instruction and
        // an eh.selector intrinsic call. If the eh.selector is a 'clean-up', we
        // need to convert it to a 'catch-all'.
        for (SmallPtrSet<IntrinsicInst*, 8>::iterator
               SI = SelCalls.begin(), SE = SelCalls.end(); SI != SE; ++SI)
          if (!HasCatchAllInSelector(*SI))
              SelsToConvert.insert(*SI);
      }
    }
  }

  if (!SelsToConvert.empty()) {
    // Convert all clean-up eh.selectors, which are associated with "invokes" of
    // URoR calls, into catch-all eh.selectors.
    Changed = true;

    for (SmallPtrSet<IntrinsicInst*, 8>::iterator
           SI = SelsToConvert.begin(), SE = SelsToConvert.end();
         SI != SE; ++SI) {
      IntrinsicInst *II = *SI;

      // Use the exception object pointer and the personality function
      // from the original selector.
      CallSite CS(II);
      IntrinsicInst::op_iterator I = CS.arg_begin();
      IntrinsicInst::op_iterator E = CS.arg_end();
      IntrinsicInst::op_iterator B = prior(E);

      // Exclude last argument if it is an integer.
      if (isa<ConstantInt>(B)) E = B;

      // Add exception object pointer (front).
      // Add personality function (next).
      // Add in any filter IDs (rest).
      SmallVector<Value*, 8> Args(I, E);

      Args.push_back(EHCatchAllValue->getInitializer()); // Catch-all indicator.

      CallInst *NewSelector =
        CallInst::Create(SelectorIntrinsic, Args.begin(), Args.end(),
                         "eh.sel.catch.all", II);

      NewSelector->setTailCall(II->isTailCall());
      NewSelector->setAttributes(II->getAttributes());
      NewSelector->setCallingConv(II->getCallingConv());

      II->replaceAllUsesWith(NewSelector);
      II->eraseFromParent();
    }
  }

  Changed |= CleanupSelectors(CatchAllSels);
  return Changed;
}