Current pass manager, not the parent pass manager, assumes the role of

last user when one of the managed pass uses info provided by parent pass
manager.

This was exposed by LPPassManager work.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34936 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 22 deletions

diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index aebff50be7..23a26130fc 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -158,7 +158,6 @@ public:
       recordAvailableAnalysis(IP);
     } else {
       P->assignPassManager(activeStack);
-      activeStack.handleLastUserOverflow();
     }
 
   }
@@ -259,7 +258,6 @@ public:
       recordAvailableAnalysis(IP);
     } else {
       P->assignPassManager(activeStack);
-      activeStack.handleLastUserOverflow();
     }
 
   }
@@ -587,6 +585,10 @@ void PMDataManager::add(Pass *P,
   AnalysisResolver *AR = new AnalysisResolver(*this);
   P->setResolver(AR);
 
+  // If a FunctionPass F is the last user of ModulePass info M
+  // then the F's manager, not F, records itself as a last user of M.
+  std::vector<Pass *> TransferLastUses;
+
   if (ProcessAnalysis) {
 
     // At the moment, this pass is the last user of all required passes.
@@ -622,6 +624,12 @@ void PMDataManager::add(Pass *P,
       LastUses.push_back(P);
     TPM->setLastUser(LastUses, P);
 
+    if (!TransferLastUses.empty()) {
+      Pass *My_PM = dynamic_cast<Pass *>(this);
+      TPM->setLastUser(TransferLastUses, My_PM);
+      TransferLastUses.clear();
+    }
+
     // Take a note of analysis required and made available by this pass.
     // Remove the analysis not preserved by this pass
     removeNotPreservedAnalysis(P);
@@ -1231,26 +1239,6 @@ void PMStack::dump() {
     printf ("\n");
 }
 
-// Walk Pass Manager stack and set LastUse markers if any
-// manager is transfering this priviledge to its parent manager
-void PMStack::handleLastUserOverflow() {
-
-  for(PMStack::iterator I = this->begin(), E = this->end(); I != E;) {
-
-    PMDataManager *Child = *I++;
-    if (I != E) {
-      PMDataManager *Parent = *I++;
-      PMTopLevelManager *TPM = Parent->getTopLevelManager();
-      std::vector<Pass *> &TLU = Child->getTransferredLastUses();
-      if (!TLU.empty()) {
-        Pass *P = dynamic_cast<Pass *>(Parent);
-        TPM->setLastUser(TLU, P);
-        TLU.clear();
-      }
-    }
-  }
-}
-
 /// Find appropriate Module Pass Manager in the PM Stack and
 /// add self into that manager. 
 void ModulePass::assignPassManager(PMStack &PMS,