diff --git a/clang/lib/StaticAnalyzer/GRState.cpp b/clang/lib/StaticAnalyzer/GRState.cpp
new file mode 100644
index 0000000..12c8968
--- /dev/null
+++ b/clang/lib/StaticAnalyzer/GRState.cpp
@@ -0,0 +1,551 @@
+//= GRState.cpp - Path-Sensitive "State" for tracking values -----*- C++ -*--=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements GRState and GRStateManager.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Analysis/CFG.h"
+#include "clang/StaticAnalyzer/PathSensitive/GRStateTrait.h"
+#include "clang/StaticAnalyzer/PathSensitive/GRState.h"
+#include "clang/StaticAnalyzer/PathSensitive/SubEngine.h"
+#include "clang/StaticAnalyzer/PathSensitive/TransferFuncs.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+using namespace ento;
+
+// Give the vtable for ConstraintManager somewhere to live.
+// FIXME: Move this elsewhere.
+ConstraintManager::~ConstraintManager() {}
+
+GRStateManager::~GRStateManager() {
+  for (std::vector<GRState::Printer*>::iterator I=Printers.begin(),
+        E=Printers.end(); I!=E; ++I)
+    delete *I;
+
+  for (GDMContextsTy::iterator I=GDMContexts.begin(), E=GDMContexts.end();
+       I!=E; ++I)
+    I->second.second(I->second.first);
+}
+
+const GRState*
+GRStateManager::RemoveDeadBindings(const GRState* state,
+                                   const StackFrameContext *LCtx,
+                                   SymbolReaper& SymReaper) {
+
+  // This code essentially performs a "mark-and-sweep" of the VariableBindings.
+  // The roots are any Block-level exprs and Decls that our liveness algorithm
+  // tells us are live.  We then see what Decls they may reference, and keep
+  // those around.  This code more than likely can be made faster, and the
+  // frequency of which this method is called should be experimented with
+  // for optimum performance.
+  llvm::SmallVector<const MemRegion*, 10> RegionRoots;
+  GRState NewState = *state;
+
+  NewState.Env = EnvMgr.RemoveDeadBindings(NewState.Env, SymReaper,
+                                           state, RegionRoots);
+
+  // Clean up the store.
+  NewState.St = StoreMgr->RemoveDeadBindings(NewState.St, LCtx, 
+                                             SymReaper, RegionRoots);
+  state = getPersistentState(NewState);
+  return ConstraintMgr->RemoveDeadBindings(state, SymReaper);
+}
+
+const GRState *GRStateManager::MarshalState(const GRState *state,
+                                            const StackFrameContext *InitLoc) {
+  // make up an empty state for now.
+  GRState State(this,
+                EnvMgr.getInitialEnvironment(),
+                StoreMgr->getInitialStore(InitLoc),
+                GDMFactory.getEmptyMap());
+
+  return getPersistentState(State);
+}
+
+const GRState *GRState::bindCompoundLiteral(const CompoundLiteralExpr* CL,
+                                            const LocationContext *LC,
+                                            SVal V) const {
+  Store new_store = 
+    getStateManager().StoreMgr->BindCompoundLiteral(St, CL, LC, V);
+  return makeWithStore(new_store);
+}
+
+const GRState *GRState::bindDecl(const VarRegion* VR, SVal IVal) const {
+  Store new_store = getStateManager().StoreMgr->BindDecl(St, VR, IVal);
+  return makeWithStore(new_store);
+}
+
+const GRState *GRState::bindDeclWithNoInit(const VarRegion* VR) const {
+  Store new_store = getStateManager().StoreMgr->BindDeclWithNoInit(St, VR);
+  return makeWithStore(new_store);
+}
+
+const GRState *GRState::bindLoc(Loc LV, SVal V) const {
+  GRStateManager &Mgr = getStateManager();
+  Store new_store = Mgr.StoreMgr->Bind(St, LV, V);
+  const GRState *new_state = makeWithStore(new_store);
+
+  const MemRegion *MR = LV.getAsRegion();
+  if (MR)
+    return Mgr.getOwningEngine().ProcessRegionChange(new_state, MR);
+
+  return new_state;
+}
+
+const GRState *GRState::bindDefault(SVal loc, SVal V) const {
+  GRStateManager &Mgr = getStateManager();
+  const MemRegion *R = cast<loc::MemRegionVal>(loc).getRegion();
+  Store new_store = Mgr.StoreMgr->BindDefault(St, R, V);
+  const GRState *new_state = makeWithStore(new_store);
+  return Mgr.getOwningEngine().ProcessRegionChange(new_state, R);
+}
+
+const GRState *GRState::InvalidateRegions(const MemRegion * const *Begin,
+                                          const MemRegion * const *End,
+                                          const Expr *E, unsigned Count,
+                                          StoreManager::InvalidatedSymbols *IS,
+                                          bool invalidateGlobals) const {
+  GRStateManager &Mgr = getStateManager();
+  SubEngine &Eng = Mgr.getOwningEngine();
+
+  if (Eng.WantsRegionChangeUpdate(this)) {
+    StoreManager::InvalidatedRegions Regions;
+
+    Store new_store = Mgr.StoreMgr->InvalidateRegions(St, Begin, End,
+                                                      E, Count, IS,
+                                                      invalidateGlobals,
+                                                      &Regions);
+    const GRState *new_state = makeWithStore(new_store);
+
+    return Eng.ProcessRegionChanges(new_state,
+                                    &Regions.front(),
+                                    &Regions.back()+1);
+  }
+
+  Store new_store = Mgr.StoreMgr->InvalidateRegions(St, Begin, End,
+                                                    E, Count, IS,
+                                                    invalidateGlobals,
+                                                    NULL);
+  return makeWithStore(new_store);
+}
+
+const GRState *GRState::unbindLoc(Loc LV) const {
+  assert(!isa<loc::MemRegionVal>(LV) && "Use InvalidateRegion instead.");
+
+  Store OldStore = getStore();
+  Store NewStore = getStateManager().StoreMgr->Remove(OldStore, LV);
+
+  if (NewStore == OldStore)
+    return this;
+
+  return makeWithStore(NewStore);
+}
+
+const GRState *GRState::EnterStackFrame(const StackFrameContext *frame) const {
+  Store new_store = getStateManager().StoreMgr->EnterStackFrame(this, frame);
+  return makeWithStore(new_store);
+}
+
+SVal GRState::getSValAsScalarOrLoc(const MemRegion *R) const {
+  // We only want to do fetches from regions that we can actually bind
+  // values.  For example, SymbolicRegions of type 'id<...>' cannot
+  // have direct bindings (but their can be bindings on their subregions).
+  if (!R->isBoundable())
+    return UnknownVal();
+
+  if (const TypedRegion *TR = dyn_cast<TypedRegion>(R)) {
+    QualType T = TR->getValueType();
+    if (Loc::IsLocType(T) || T->isIntegerType())
+      return getSVal(R);
+  }
+
+  return UnknownVal();
+}
+
+SVal GRState::getSVal(Loc location, QualType T) const {
+  SVal V = getRawSVal(cast<Loc>(location), T);
+
+  // If 'V' is a symbolic value that is *perfectly* constrained to
+  // be a constant value, use that value instead to lessen the burden
+  // on later analysis stages (so we have less symbolic values to reason
+  // about).
+  if (!T.isNull()) {
+    if (SymbolRef sym = V.getAsSymbol()) {
+      if (const llvm::APSInt *Int = getSymVal(sym)) {
+        // FIXME: Because we don't correctly model (yet) sign-extension
+        // and truncation of symbolic values, we need to convert
+        // the integer value to the correct signedness and bitwidth.
+        //
+        // This shows up in the following:
+        //
+        //   char foo();
+        //   unsigned x = foo();
+        //   if (x == 54)
+        //     ...
+        //
+        //  The symbolic value stored to 'x' is actually the conjured
+        //  symbol for the call to foo(); the type of that symbol is 'char',
+        //  not unsigned.
+        const llvm::APSInt &NewV = getBasicVals().Convert(T, *Int);
+        
+        if (isa<Loc>(V))
+          return loc::ConcreteInt(NewV);
+        else
+          return nonloc::ConcreteInt(NewV);
+      }
+    }
+  }
+  
+  return V;
+}
+
+const GRState *GRState::BindExpr(const Stmt* S, SVal V, bool Invalidate) const{
+  Environment NewEnv = getStateManager().EnvMgr.bindExpr(Env, S, V,
+                                                         Invalidate);
+  if (NewEnv == Env)
+    return this;
+
+  GRState NewSt = *this;
+  NewSt.Env = NewEnv;
+  return getStateManager().getPersistentState(NewSt);
+}
+
+const GRState *GRState::bindExprAndLocation(const Stmt *S, SVal location,
+                                            SVal V) const {
+  Environment NewEnv =
+    getStateManager().EnvMgr.bindExprAndLocation(Env, S, location, V);
+
+  if (NewEnv == Env)
+    return this;
+  
+  GRState NewSt = *this;
+  NewSt.Env = NewEnv;
+  return getStateManager().getPersistentState(NewSt);
+}
+
+const GRState *GRState::assumeInBound(DefinedOrUnknownSVal Idx,
+                                      DefinedOrUnknownSVal UpperBound,
+                                      bool Assumption) const {
+  if (Idx.isUnknown() || UpperBound.isUnknown())
+    return this;
+
+  // Build an expression for 0 <= Idx < UpperBound.
+  // This is the same as Idx + MIN < UpperBound + MIN, if overflow is allowed.
+  // FIXME: This should probably be part of SValBuilder.
+  GRStateManager &SM = getStateManager();
+  SValBuilder &svalBuilder = SM.getSValBuilder();
+  ASTContext &Ctx = svalBuilder.getContext();
+
+  // Get the offset: the minimum value of the array index type.
+  BasicValueFactory &BVF = svalBuilder.getBasicValueFactory();
+  // FIXME: This should be using ValueManager::ArrayindexTy...somehow.
+  QualType indexTy = Ctx.IntTy;
+  nonloc::ConcreteInt Min(BVF.getMinValue(indexTy));
+
+  // Adjust the index.
+  SVal newIdx = svalBuilder.evalBinOpNN(this, BO_Add,
+                                        cast<NonLoc>(Idx), Min, indexTy);
+  if (newIdx.isUnknownOrUndef())
+    return this;
+
+  // Adjust the upper bound.
+  SVal newBound =
+    svalBuilder.evalBinOpNN(this, BO_Add, cast<NonLoc>(UpperBound),
+                            Min, indexTy);
+
+  if (newBound.isUnknownOrUndef())
+    return this;
+
+  // Build the actual comparison.
+  SVal inBound = svalBuilder.evalBinOpNN(this, BO_LT,
+                                cast<NonLoc>(newIdx), cast<NonLoc>(newBound),
+                                Ctx.IntTy);
+  if (inBound.isUnknownOrUndef())
+    return this;
+
+  // Finally, let the constraint manager take care of it.
+  ConstraintManager &CM = SM.getConstraintManager();
+  return CM.assume(this, cast<DefinedSVal>(inBound), Assumption);
+}
+
+const GRState* GRStateManager::getInitialState(const LocationContext *InitLoc) {
+  GRState State(this,
+                EnvMgr.getInitialEnvironment(),
+                StoreMgr->getInitialStore(InitLoc),
+                GDMFactory.getEmptyMap());
+
+  return getPersistentState(State);
+}
+
+const GRState* GRStateManager::getPersistentState(GRState& State) {
+
+  llvm::FoldingSetNodeID ID;
+  State.Profile(ID);
+  void* InsertPos;
+
+  if (GRState* I = StateSet.FindNodeOrInsertPos(ID, InsertPos))
+    return I;
+
+  GRState* I = (GRState*) Alloc.Allocate<GRState>();
+  new (I) GRState(State);
+  StateSet.InsertNode(I, InsertPos);
+  return I;
+}
+
+const GRState* GRState::makeWithStore(Store store) const {
+  GRState NewSt = *this;
+  NewSt.St = store;
+  return getStateManager().getPersistentState(NewSt);
+}
+
+//===----------------------------------------------------------------------===//
+//  State pretty-printing.
+//===----------------------------------------------------------------------===//
+
+static bool IsEnvLoc(const Stmt *S) {
+  // FIXME: This is a layering violation.  Should be in environment.
+  return (bool) (((uintptr_t) S) & 0x1);
+}
+
+void GRState::print(llvm::raw_ostream& Out, CFG &C, const char* nl,
+                    const char* sep) const {
+  // Print the store.
+  GRStateManager &Mgr = getStateManager();
+  Mgr.getStoreManager().print(getStore(), Out, nl, sep);
+
+  // Print Subexpression bindings.
+  bool isFirst = true;
+
+  // FIXME: All environment printing should be moved inside Environment.
+  for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
+    if (C.isBlkExpr(I.getKey()) || IsEnvLoc(I.getKey()))
+      continue;
+
+    if (isFirst) {
+      Out << nl << nl << "Sub-Expressions:" << nl;
+      isFirst = false;
+    }
+    else { Out << nl; }
+
+    Out << " (" << (void*) I.getKey() << ") ";
+    LangOptions LO; // FIXME.
+    I.getKey()->printPretty(Out, 0, PrintingPolicy(LO));
+    Out << " : " << I.getData();
+  }
+
+  // Print block-expression bindings.
+  isFirst = true;
+
+  for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
+    if (!C.isBlkExpr(I.getKey()))
+      continue;
+
+    if (isFirst) {
+      Out << nl << nl << "Block-level Expressions:" << nl;
+      isFirst = false;
+    }
+    else { Out << nl; }
+
+    Out << " (" << (void*) I.getKey() << ") ";
+    LangOptions LO; // FIXME.
+    I.getKey()->printPretty(Out, 0, PrintingPolicy(LO));
+    Out << " : " << I.getData();
+  }
+  
+  // Print locations.
+  isFirst = true;
+  
+  for (Environment::iterator I = Env.begin(), E = Env.end(); I != E; ++I) {
+    if (!IsEnvLoc(I.getKey()))
+      continue;
+    
+    if (isFirst) {
+      Out << nl << nl << "Load/store locations:" << nl;
+      isFirst = false;
+    }
+    else { Out << nl; }
+
+    const Stmt *S = (Stmt*) (((uintptr_t) I.getKey()) & ((uintptr_t) ~0x1));
+    
+    Out << " (" << (void*) S << ") ";
+    LangOptions LO; // FIXME.
+    S->printPretty(Out, 0, PrintingPolicy(LO));
+    Out << " : " << I.getData();
+  }
+
+  Mgr.getConstraintManager().print(this, Out, nl, sep);
+
+  // Print checker-specific data.
+  for (std::vector<Printer*>::iterator I = Mgr.Printers.begin(),
+                                       E = Mgr.Printers.end(); I != E; ++I) {
+    (*I)->Print(Out, this, nl, sep);
+  }
+}
+
+void GRState::printDOT(llvm::raw_ostream& Out, CFG &C) const {
+  print(Out, C, "\\l", "\\|");
+}
+
+void GRState::printStdErr(CFG &C) const {
+  print(llvm::errs(), C);
+}
+
+//===----------------------------------------------------------------------===//
+// Generic Data Map.
+//===----------------------------------------------------------------------===//
+
+void* const* GRState::FindGDM(void* K) const {
+  return GDM.lookup(K);
+}
+
+void*
+GRStateManager::FindGDMContext(void* K,
+                               void* (*CreateContext)(llvm::BumpPtrAllocator&),
+                               void (*DeleteContext)(void*)) {
+
+  std::pair<void*, void (*)(void*)>& p = GDMContexts[K];
+  if (!p.first) {
+    p.first = CreateContext(Alloc);
+    p.second = DeleteContext;
+  }
+
+  return p.first;
+}
+
+const GRState* GRStateManager::addGDM(const GRState* St, void* Key, void* Data){
+  GRState::GenericDataMap M1 = St->getGDM();
+  GRState::GenericDataMap M2 = GDMFactory.add(M1, Key, Data);
+
+  if (M1 == M2)
+    return St;
+
+  GRState NewSt = *St;
+  NewSt.GDM = M2;
+  return getPersistentState(NewSt);
+}
+
+const GRState *GRStateManager::removeGDM(const GRState *state, void *Key) {
+  GRState::GenericDataMap OldM = state->getGDM();
+  GRState::GenericDataMap NewM = GDMFactory.remove(OldM, Key);
+
+  if (NewM == OldM)
+    return state;
+
+  GRState NewState = *state;
+  NewState.GDM = NewM;
+  return getPersistentState(NewState);
+}
+
+//===----------------------------------------------------------------------===//
+// Utility.
+//===----------------------------------------------------------------------===//
+
+namespace {
+class ScanReachableSymbols : public SubRegionMap::Visitor  {
+  typedef llvm::DenseSet<const MemRegion*> VisitedRegionsTy;
+
+  VisitedRegionsTy visited;
+  const GRState *state;
+  SymbolVisitor &visitor;
+  llvm::OwningPtr<SubRegionMap> SRM;
+public:
+
+  ScanReachableSymbols(const GRState *st, SymbolVisitor& v)
+    : state(st), visitor(v) {}
+
+  bool scan(nonloc::CompoundVal val);
+  bool scan(SVal val);
+  bool scan(const MemRegion *R);
+
+  // From SubRegionMap::Visitor.
+  bool Visit(const MemRegion* Parent, const MemRegion* SubRegion) {
+    return scan(SubRegion);
+  }
+};
+}
+
+bool ScanReachableSymbols::scan(nonloc::CompoundVal val) {
+  for (nonloc::CompoundVal::iterator I=val.begin(), E=val.end(); I!=E; ++I)
+    if (!scan(*I))
+      return false;
+
+  return true;
+}
+
+bool ScanReachableSymbols::scan(SVal val) {
+  if (loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(&val))
+    return scan(X->getRegion());
+
+  if (nonloc::LocAsInteger *X = dyn_cast<nonloc::LocAsInteger>(&val))
+    return scan(X->getLoc());
+
+  if (SymbolRef Sym = val.getAsSymbol())
+    return visitor.VisitSymbol(Sym);
+
+  if (nonloc::CompoundVal *X = dyn_cast<nonloc::CompoundVal>(&val))
+    return scan(*X);
+
+  return true;
+}
+
+bool ScanReachableSymbols::scan(const MemRegion *R) {
+  if (isa<MemSpaceRegion>(R) || visited.count(R))
+    return true;
+
+  visited.insert(R);
+
+  // If this is a symbolic region, visit the symbol for the region.
+  if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(R))
+    if (!visitor.VisitSymbol(SR->getSymbol()))
+      return false;
+
+  // If this is a subregion, also visit the parent regions.
+  if (const SubRegion *SR = dyn_cast<SubRegion>(R))
+    if (!scan(SR->getSuperRegion()))
+      return false;
+
+  // Now look at the binding to this region (if any).
+  if (!scan(state->getSValAsScalarOrLoc(R)))
+    return false;
+
+  // Now look at the subregions.
+  if (!SRM.get())
+    SRM.reset(state->getStateManager().getStoreManager().
+                                           getSubRegionMap(state->getStore()));
+
+  return SRM->iterSubRegions(R, *this);
+}
+
+bool GRState::scanReachableSymbols(SVal val, SymbolVisitor& visitor) const {
+  ScanReachableSymbols S(this, visitor);
+  return S.scan(val);
+}
+
+bool GRState::scanReachableSymbols(const SVal *I, const SVal *E,
+                                   SymbolVisitor &visitor) const {
+  ScanReachableSymbols S(this, visitor);
+  for ( ; I != E; ++I) {
+    if (!S.scan(*I))
+      return false;
+  }
+  return true;
+}
+
+bool GRState::scanReachableSymbols(const MemRegion * const *I,
+                                   const MemRegion * const *E,
+                                   SymbolVisitor &visitor) const {
+  ScanReachableSymbols S(this, visitor);
+  for ( ; I != E; ++I) {
+    if (!S.scan(*I))
+      return false;
+  }
+  return true;
+}