C++ IdentifyingPassPtr类代码示例

/// Add a CodeGen pass at this point in the pipeline after checking for target
/// and command line overrides.
///
/// addPass cannot return a pointer to the pass instance because is internal the
/// PassManager and the instance we create here may already be freed.
AnalysisID TargetPassConfig::addPass(AnalysisID PassID) {
  IdentifyingPassPtr TargetID = getPassSubstitution(PassID);
  IdentifyingPassPtr FinalPtr = overridePass(PassID, TargetID);
  if (!FinalPtr.isValid())
    return nullptr;

  Pass *P;
  if (FinalPtr.isInstance())
    P = FinalPtr.getInstance();
  else {
    P = Pass::createPass(FinalPtr.getID());
    if (!P)
      llvm_unreachable("Pass ID not registered");
  }
  AnalysisID FinalID = P->getPassID();
  addPass(P); // Ends the lifetime of P.

  // Add the passes after the pass P if there is any.
  for (SmallVectorImpl<std::pair<AnalysisID, IdentifyingPassPtr> >::iterator
         I = Impl->InsertedPasses.begin(), E = Impl->InsertedPasses.end();
       I != E; ++I) {
    if ((*I).first == PassID) {
      assert((*I).second.isValid() && "Illegal Pass ID!");
      Pass *NP;
      if ((*I).second.isInstance())
        NP = (*I).second.getInstance();
      else {
        NP = Pass::createPass((*I).second.getID());
        assert(NP && "Pass ID not registered");
      }
      addPass(NP);
    }
  }
  return FinalID;
}

/// Insert InsertedPassID pass after TargetPassID.
void TargetPassConfig::insertPass(AnalysisID TargetPassID,
                                  IdentifyingPassPtr InsertedPassID) {
  assert(((!InsertedPassID.isInstance() &&
           TargetPassID != InsertedPassID.getID()) ||
          (InsertedPassID.isInstance() &&
           TargetPassID != InsertedPassID.getInstance()->getPassID())) &&
         "Insert a pass after itself!");
  std::pair<AnalysisID, IdentifyingPassPtr> P(TargetPassID, InsertedPassID);
  Impl->InsertedPasses.push_back(P);
}

/// Insert InsertedPassID pass after TargetPassID.
void TargetPassConfig::insertPass(AnalysisID TargetPassID,
                                  IdentifyingPassPtr InsertedPassID,
                                  bool VerifyAfter, bool PrintAfter) {
  assert(((!InsertedPassID.isInstance() &&
           TargetPassID != InsertedPassID.getID()) ||
          (InsertedPassID.isInstance() &&
           TargetPassID != InsertedPassID.getInstance()->getPassID())) &&
         "Insert a pass after itself!");
  Impl->InsertedPasses.emplace_back(TargetPassID, InsertedPassID, VerifyAfter,
                                    PrintAfter);
}

/// Add a CodeGen pass at this point in the pipeline after checking for target
/// and command line overrides.
///
/// addPass cannot return a pointer to the pass instance because is internal the
/// PassManager and the instance we create here may already be freed.
AnalysisID TargetPassConfig::addPass(AnalysisID PassID, bool verifyAfter,
                                     bool printAfter) {
  IdentifyingPassPtr TargetID = getPassSubstitution(PassID);
  IdentifyingPassPtr FinalPtr = overridePass(PassID, TargetID);
  if (!FinalPtr.isValid())
    return nullptr;

  Pass *P;
  if (FinalPtr.isInstance())
    P = FinalPtr.getInstance();
  else {
    P = Pass::createPass(FinalPtr.getID());
    if (!P)
      llvm_unreachable("Pass ID not registered");
  }
  AnalysisID FinalID = P->getPassID();
  addPass(P, verifyAfter, printAfter); // Ends the lifetime of P.

  return FinalID;
}

/// Allow Pass selection to be overriden by command line options. This supports
/// flags with ternary conditions. TargetID is passed through by default. The
/// pass is suppressed when the option is false. When the option is true, the
/// StandardID is selected if the target provides no default.
static IdentifyingPassPtr applyOverride(IdentifyingPassPtr TargetID,
                                        cl::boolOrDefault Override,
                                        AnalysisID StandardID) {
  switch (Override) {
  case cl::BOU_UNSET:
    return TargetID;
  case cl::BOU_TRUE:
    if (TargetID.isValid())
      return TargetID;
    if (StandardID == nullptr)
      report_fatal_error("Target cannot enable pass");
    return StandardID;
  case cl::BOU_FALSE:
    return IdentifyingPassPtr();
  }
  llvm_unreachable("Invalid command line option state");
}

bool TargetPassConfig::isPassSubstitutedOrOverridden(AnalysisID ID) const {
  IdentifyingPassPtr TargetID = getPassSubstitution(ID);
  IdentifyingPassPtr FinalPtr = overridePass(ID, TargetID);
  return !FinalPtr.isValid() || FinalPtr.isInstance() ||
      FinalPtr.getID() != ID;
}