[LegacyPassManager] Simplify FunctionPass::assignPassManager

And make it clear the parameter PreferredType is unused for FunctionPass.

diff --git a/llvm/lib/IR/LegacyPassManager.cpp b/llvm/lib/IR/LegacyPassManager.cpp
index f3c1372..90239bb 100644 (file)
--- a/llvm/lib/IR/LegacyPassManager.cpp
+++ b/llvm/lib/IR/LegacyPassManager.cpp
@@ -1786,36 +1786,32 @@ void ModulePass::assignPassManager(PMStack &PMS,
 /// Find appropriate Function Pass Manager or Call Graph Pass Manager
 /// in the PM Stack and add self into that manager.
 void FunctionPass::assignPassManager(PMStack &PMS,
-                                     PassManagerType PreferredType) {
+                                     PassManagerType /*PreferredType*/) {
   // Find Function Pass Manager
-  while (PMS.top()->getPassManagerType() > PMT_FunctionPassManager)
+  PMDataManager *PM;
+  while (PM = PMS.top(), PM->getPassManagerType() > PMT_FunctionPassManager)
     PMS.pop();
 
   // Create new Function Pass Manager if needed.
-  FPPassManager *FPP;
-  if (PMS.top()->getPassManagerType() == PMT_FunctionPassManager) {
-    FPP = (FPPassManager *)PMS.top();
-  } else {
-    PMDataManager *PMD = PMS.top();
-
+  if (PM->getPassManagerType() != PMT_FunctionPassManager) {
     // [1] Create new Function Pass Manager
-    FPP = new FPPassManager();
+    auto *FPP = new FPPassManager;
     FPP->populateInheritedAnalysis(PMS);
 
     // [2] Set up new manager's top level manager
-    PMTopLevelManager *TPM = PMD->getTopLevelManager();
-    TPM->addIndirectPassManager(FPP);
+    PM->getTopLevelManager()->addIndirectPassManager(FPP);
 
     // [3] Assign manager to manage this new manager. This may create
     // and push new managers into PMS
-    FPP->assignPassManager(PMS, PMD->getPassManagerType());
+    FPP->assignPassManager(PMS, PM->getPassManagerType());
 
     // [4] Push new manager into PMS
     PMS.push(FPP);
+    PM = FPP;
   }
 
   // Assign FPP as the manager of this pass.
-  FPP->add(this);
+  PM->add(this);
 }
 
 PassManagerBase::~PassManagerBase() {}