Revert r149311 which failed to compile.

Original log:

Convert ProgramStateRef to a smart pointer for managing the reference counts of ProgramStates.  This leads to a slight memory
improvement, and a simplification of the logic for managing ProgramState objects.

llvm-svn: 149336

1 files changed, 16 insertions, 22 deletions

diff --git a/clang/lib/StaticAnalyzer/Core/ProgramState.cpp b/clang/lib/StaticAnalyzer/Core/ProgramState.cpp
index 459bf83ce5e..b8b9ad94df3 100644
--- a/clang/lib/StaticAnalyzer/Core/ProgramState.cpp
+++ b/clang/lib/StaticAnalyzer/Core/ProgramState.cpp
@@ -25,26 +25,6 @@ using namespace ento;
 // FIXME: Move this elsewhere.
 ConstraintManager::~ConstraintManager() {}
 
-namespace clang { namespace  ento {
-/// Increments the number of times this state is referenced.
-
-void ProgramStateRetain(const ProgramState *state) {
-  ++const_cast<ProgramState*>(state)->refCount;
-}
-
-/// Decrement the number of times this state is referenced.
-void ProgramStateRelease(const ProgramState *state) {
-  assert(state->refCount > 0);
-  ProgramState *s = const_cast<ProgramState*>(state);
-  if (--s->refCount == 0) {
-    ProgramStateManager &Mgr = s->getStateManager();
-    Mgr.StateSet.RemoveNode(s);
-    s->~ProgramState();    
-    Mgr.freeStates.push_back(s);
-  }
-}
-}}
-
 ProgramState::ProgramState(ProgramStateManager *mgr, const Environment& env,
                  StoreRef st, GenericDataMap gdm)
   : stateMgr(mgr),
@@ -348,10 +328,23 @@ ProgramStateRef ProgramStateManager::getInitialState(const LocationContext *Init
   return getPersistentState(State);
 }
 
+void ProgramStateManager::recycleUnusedStates() {
+  for (std::vector<ProgramState*>::iterator i = recentlyAllocatedStates.begin(),
+       e = recentlyAllocatedStates.end(); i != e; ++i) {
+    ProgramState *state = *i;
+    if (state->referencedByExplodedNode())
+      continue;
+    StateSet.RemoveNode(state);
+    freeStates.push_back(state);
+    state->~ProgramState();
+  }
+  recentlyAllocatedStates.clear();
+}
+
 ProgramStateRef ProgramStateManager::getPersistentStateWithGDM(
                                                      ProgramStateRef FromState,
                                                      ProgramStateRef GDMState) {
-  ProgramState NewState(*FromState);
+  ProgramState NewState = *FromState;
   NewState.GDM = GDMState->GDM;
   return getPersistentState(NewState);
 }
@@ -375,11 +368,12 @@ ProgramStateRef ProgramStateManager::getPersistentState(ProgramState &State) {
   }
   new (newState) ProgramState(State);
   StateSet.InsertNode(newState, InsertPos);
+  recentlyAllocatedStates.push_back(newState);
   return newState;
 }
 
 ProgramStateRef ProgramState::makeWithStore(const StoreRef &store) const {
-  ProgramState NewSt(*this);
+  ProgramState NewSt = *this;
   NewSt.setStore(store);
   return getStateManager().getPersistentState(NewSt);
 }