+//===----------------------------------------------------------------------===//
+// LoopPass
+
+Pass *LoopPass::createPrinterPass(raw_ostream &O,
+ const std::string &Banner) const {
+ return new PrintLoopPass(Banner, O);
+}
+
+// Check if this pass is suitable for the current LPPassManager, if
+// available. This pass P is not suitable for a LPPassManager if P
+// is not preserving higher level analysis info used by other
+// LPPassManager passes. In such case, pop LPPassManager from the
+// stack. This will force assignPassManager() to create new
+// LPPassManger as expected.
+void LoopPass::preparePassManager(PMStack &PMS) {
+
+ // Find LPPassManager
+ while (!PMS.empty() &&
+ PMS.top()->getPassManagerType() > PMT_LoopPassManager)
+ PMS.pop();
+
+ // If this pass is destroying high level information that is used
+ // by other passes that are managed by LPM then do not insert
+ // this pass in current LPM. Use new LPPassManager.
+ if (PMS.top()->getPassManagerType() == PMT_LoopPassManager &&
+ !PMS.top()->preserveHigherLevelAnalysis(this))
+ PMS.pop();
+}
+
+/// Assign pass manager to manage this pass.
+void LoopPass::assignPassManager(PMStack &PMS,
+ PassManagerType PreferredType) {
+ // Find LPPassManager
+ while (!PMS.empty() &&
+ PMS.top()->getPassManagerType() > PMT_LoopPassManager)
+ PMS.pop();
+
+ LPPassManager *LPPM;
+ if (PMS.top()->getPassManagerType() == PMT_LoopPassManager)
+ LPPM = (LPPassManager*)PMS.top();
+ else {
+ // Create new Loop Pass Manager if it does not exist.
+ assert (!PMS.empty() && "Unable to create Loop Pass Manager");
+ PMDataManager *PMD = PMS.top();
+
+ // [1] Create new Loop Pass Manager
+ LPPM = new LPPassManager();
+ LPPM->populateInheritedAnalysis(PMS);
+
+ // [2] Set up new manager's top level manager
+ PMTopLevelManager *TPM = PMD->getTopLevelManager();
+ TPM->addIndirectPassManager(LPPM);
+
+ // [3] Assign manager to manage this new manager. This may create
+ // and push new managers into PMS
+ Pass *P = LPPM->getAsPass();
+ TPM->schedulePass(P);
+
+ // [4] Push new manager into PMS
+ PMS.push(LPPM);
+ }
+
+ LPPM->add(this);
+}
+
+// Containing function has Attribute::OptimizeNone and transformation
+// passes should skip it.
+bool LoopPass::skipOptnoneFunction(const Loop *L) const {
+ const Function *F = L->getHeader()->getParent();
+ if (F && F->hasFnAttribute(Attribute::OptimizeNone)) {
+ // FIXME: Report this to dbgs() only once per function.
+ DEBUG(dbgs() << "Skipping pass '" << getPassName()
+ << "' in function " << F->getName() << "\n");
+ // FIXME: Delete loop from pass manager's queue?
+ return true;
+ }
+ return false;
+}