Move the ConstantInt uniquing table into LLVMContextImpl. This exposed a number of issues in

our current context-passing stuff, which is also fixed here


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76089 91177308-0d34-0410-b5e6-96231b3b80d8

34 files changed, 173 insertions, 91 deletions

diff --git a/examples/BrainF/BrainFDriver.cpp b/examples/BrainF/BrainFDriver.cpp
index 4eaa4940e7..021b9510ce 100644
--- a/examples/BrainF/BrainFDriver.cpp
+++ b/examples/BrainF/BrainFDriver.cpp
@@ -80,13 +80,13 @@ void addMainFunction(Module *mod) {
   }
 
   //ret i32 0
-  ReturnInst::Create(ConstantInt::get(APInt(32, 0)), bb);
+  ReturnInst::Create(getGlobalContext().getConstantInt(APInt(32, 0)), bb);
 }
 
 int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv, " BrainF compiler\n");
 
-  LLVMContext Context;
+  LLVMContext &Context = getGlobalContext();
 
   if (InputFilename == "") {
     std::cerr<<"Error: You must specify the filename of the program to "
diff --git a/include/llvm/Analysis/LoopPass.h b/include/llvm/Analysis/LoopPass.h
index 7659b5bf45..a6a23c6b61 100644
--- a/include/llvm/Analysis/LoopPass.h
+++ b/include/llvm/Analysis/LoopPass.h
@@ -37,6 +37,7 @@ public:
 
   // Initialization and finalization hooks.
   virtual bool doInitialization(Loop *L, LPPassManager &LPM) {
+    Context = L->getHeader()->getContext();
     return false;
   }
 
diff --git a/include/llvm/CallGraphSCCPass.h b/include/llvm/CallGraphSCCPass.h
index d5ff17cf24..8d5d7c3edf 100644
--- a/include/llvm/CallGraphSCCPass.h
+++ b/include/llvm/CallGraphSCCPass.h
@@ -22,6 +22,7 @@
 #define LLVM_CALL_GRAPH_SCC_PASS_H
 
 #include "llvm/Pass.h"
+#include "llvm/Analysis/CallGraph.h"
 
 namespace llvm {
 
@@ -37,6 +38,7 @@ struct CallGraphSCCPass : public Pass {
   /// doInitialization - This method is called before the SCC's of the program
   /// has been processed, allowing the pass to do initialization as necessary.
   virtual bool doInitialization(CallGraph &CG) {
+    Context = &CG.getModule().getContext();
     return false;
   }
 
diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h
index e06ce1f1b9..df086416a8 100644
--- a/include/llvm/Constants.h
+++ b/include/llvm/Constants.h
@@ -50,6 +50,7 @@ class ConstantInt : public Constant {
   ConstantInt(const ConstantInt &);      // DO NOT IMPLEMENT
   ConstantInt(const IntegerType *Ty, const APInt& V);
   APInt Val;
+  friend class LLVMContextImpl;
 protected:
   // allocate space for exactly zero operands
   void *operator new(size_t s) {
@@ -102,10 +103,6 @@ public:
     return CreateTrueFalseVals(false);
   }
 
-  /// Return a ConstantInt with the specified value and an implied Type. The
-  /// type is the integer type that corresponds to the bit width of the value.
-  static ConstantInt *get(const APInt &V);
-
   /// getType - Specialize the getType() method to always return an IntegerType,
   /// which reduces the amount of casting needed in parts of the compiler.
   ///
diff --git a/include/llvm/LLVMContext.h b/include/llvm/LLVMContext.h
index 552e7992c6..4aa2c20ec2 100644
--- a/include/llvm/LLVMContext.h
+++ b/include/llvm/LLVMContext.h
@@ -93,6 +93,8 @@ public:
   ConstantInt* getConstantIntSigned(const IntegerType* Ty, int64_t V);
   Constant *getConstantIntSigned(const Type *Ty, int64_t V);
   
+  /// Return a ConstantInt with the specified value and an implied Type. The
+  /// type is the integer type that corresponds to the bit width of the value.
   ConstantInt* getConstantInt(const APInt& V);
   
   /// If Ty is a vector type, return a Constant with a splat of the given
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 59839e8c8b..c10c6f3f27 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -312,6 +312,8 @@ BasicAliasAnalysis::getModRefInfo(CallSite CS1, CallSite CS2) {
 AliasAnalysis::AliasResult
 BasicAliasAnalysis::alias(const Value *V1, unsigned V1Size,
                           const Value *V2, unsigned V2Size) {
+  Context = &V1->getType()->getContext();
+
   // Strip off any constant expression casts if they exist
   if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V1))
     if (CE->isCast() && isa<PointerType>(CE->getOperand(0)->getType()))
@@ -530,6 +532,8 @@ BasicAliasAnalysis::CheckGEPInstructions(
 
   const PointerType *GEPPointerTy = cast<PointerType>(BasePtr1Ty);
 
+  Context = &GEPPointerTy->getContext();
+
   // Find the (possibly empty) initial sequence of equal values... which are not
   // necessarily constants.
   unsigned NumGEP1Operands = NumGEP1Ops, NumGEP2Operands = NumGEP2Ops;
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index dcd6558d34..1b0b37ba01 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -191,7 +191,7 @@ const SCEV *ScalarEvolution::getConstant(ConstantInt *V) {
 }
 
 const SCEV *ScalarEvolution::getConstant(const APInt& Val) {
-  return getConstant(ConstantInt::get(Val));
+  return getConstant(Context->getConstantInt(Val));
 }
 
 const SCEV *
@@ -1517,7 +1517,7 @@ const SCEV *ScalarEvolution::getMulExpr(SmallVectorImpl<const SCEV *> &Ops) {
     ++Idx;
     while (const SCEVConstant *RHSC = dyn_cast<SCEVConstant>(Ops[Idx])) {
       // We found two constants, fold them together!
-      ConstantInt *Fold = ConstantInt::get(LHSC->getValue()->getValue() *
+      ConstantInt *Fold = Context->getConstantInt(LHSC->getValue()->getValue() *
                                            RHSC->getValue()->getValue());
       Ops[0] = getConstant(Fold);
       Ops.erase(Ops.begin()+1);  // Erase the folded element
@@ -1868,7 +1868,7 @@ ScalarEvolution::getSMaxExpr(SmallVectorImpl<const SCEV *> &Ops) {
     assert(Idx < Ops.size());
     while (const SCEVConstant *RHSC = dyn_cast<SCEVConstant>(Ops[Idx])) {
       // We found two constants, fold them together!
-      ConstantInt *Fold = ConstantInt::get(
+      ConstantInt *Fold = Context->getConstantInt(
                               APIntOps::smax(LHSC->getValue()->getValue(),
                                              RHSC->getValue()->getValue()));
       Ops[0] = getConstant(Fold);
@@ -1965,7 +1965,7 @@ ScalarEvolution::getUMaxExpr(SmallVectorImpl<const SCEV *> &Ops) {
     assert(Idx < Ops.size());
     while (const SCEVConstant *RHSC = dyn_cast<SCEVConstant>(Ops[Idx])) {
       // We found two constants, fold them together!
-      ConstantInt *Fold = ConstantInt::get(
+      ConstantInt *Fold = Context->getConstantInt(
                               APIntOps::umax(LHSC->getValue()->getValue(),
                                              RHSC->getValue()->getValue()));
       Ops[0] = getConstant(Fold);
@@ -2887,7 +2887,7 @@ const SCEV *ScalarEvolution::createSCEV(Value *V) {
     // Turn shift left of a constant amount into a multiply.
     if (ConstantInt *SA = dyn_cast<ConstantInt>(U->getOperand(1))) {
       uint32_t BitWidth = cast<IntegerType>(V->getType())->getBitWidth();
-      Constant *X = ConstantInt::get(
+      Constant *X = Context->getConstantInt(
         APInt(BitWidth, 1).shl(SA->getLimitedValue(BitWidth)));
       return getMulExpr(getSCEV(U->getOperand(0)), getSCEV(X));
     }
@@ -2897,7 +2897,7 @@ const SCEV *ScalarEvolution::createSCEV(Value *V) {
     // Turn logical shift right of a constant into a unsigned divide.
     if (ConstantInt *SA = dyn_cast<ConstantInt>(U->getOperand(1))) {
       uint32_t BitWidth = cast<IntegerType>(V->getType())->getBitWidth();
-      Constant *X = ConstantInt::get(
+      Constant *X = Context->getConstantInt(
         APInt(BitWidth, 1).shl(SA->getLimitedValue(BitWidth)));
       return getUDivExpr(getSCEV(U->getOperand(0)), getSCEV(X));
     }
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index adb4d729e6..d523e7fce3 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -108,7 +108,7 @@ unsigned FastISel::getRegForValue(Value *V) {
       if (isExact) {
         APInt IntVal(IntBitWidth, 2, x);
 
-        unsigned IntegerReg = getRegForValue(ConstantInt::get(IntVal));
+        unsigned IntegerReg = getRegForValue(Context->getConstantInt(IntVal));
         if (IntegerReg != 0)
           Reg = FastEmit_r(IntVT.getSimpleVT(), VT, ISD::SINT_TO_FP, IntegerReg);
       }
diff --git a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
index 600185be97..1412ad9f11 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
@@ -2305,7 +2305,8 @@ SDValue DAGTypeLegalizer::ExpandIntOp_UINT_TO_FP(SDNode *N) {
                                    ISD::SETLT);
 
     // Build a 64 bit pair (0, FF) in the constant pool, with FF in the lo bits.
-    SDValue FudgePtr = DAG.getConstantPool(ConstantInt::get(FF.zext(64)),
+    SDValue FudgePtr = DAG.getConstantPool(
+                                  DAG.getContext()->getConstantInt(FF.zext(64)),
                                            TLI.getPointerTy());
 
     // Get a pointer to FF if the sign bit was set, or to 0 otherwise.
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index caa3ce1857..4491eb262b 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -874,7 +874,7 @@ SDValue SelectionDAG::getConstant(uint64_t Val, MVT VT, bool isT) {
 }
 
 SDValue SelectionDAG::getConstant(const APInt &Val, MVT VT, bool isT) {
-  return getConstant(*ConstantInt::get(Val), VT, isT);
+  return getConstant(*Context->getConstantInt(Val), VT, isT);
 }
 
 SDValue SelectionDAG::getConstant(const ConstantInt &Val, MVT VT, bool isT) {
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index b1589d4c09..4f90bb31fc 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -2406,7 +2406,8 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
   // Convert the ConstantVector mask operand into an array of ints, with -1
   // representing undef values.
   SmallVector<Constant*, 8> MaskElts;
-  cast<Constant>(I.getOperand(2))->getVectorElements(*Context, MaskElts);
+  cast<Constant>(I.getOperand(2))->getVectorElements(*DAG.getContext(), 
+                                                     MaskElts);
   unsigned MaskNumElts = MaskElts.size();
   for (unsigned i = 0; i != MaskNumElts; ++i) {
     if (isa<UndefValue>(MaskElts[i]))
diff --git a/lib/Transforms/IPO/DeadArgumentElimination.cpp b/lib/Transforms/IPO/DeadArgumentElimination.cpp
index 2e913914d6..e86f619dcb 100644
--- a/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -908,6 +908,7 @@ bool DAE::RemoveDeadStuffFromFunction(Function *F) {
 
 bool DAE::runOnModule(Module &M) {
   bool Changed = false;
+  Context = &M.getContext();
 
   // First pass: Do a simple check to see if any functions can have their "..."
   // removed.  We can do this if they never call va_start.  This loop cannot be
diff --git a/lib/Transforms/IPO/DeadTypeElimination.cpp b/lib/Transforms/IPO/DeadTypeElimination.cpp
index 85aed2b791..f202403d80 100644
--- a/lib/Transforms/IPO/DeadTypeElimination.cpp
+++ b/lib/Transforms/IPO/DeadTypeElimination.cpp
@@ -77,6 +77,7 @@ static inline bool ShouldNukeSymtabEntry(const Type *Ty){
 //
 bool DTE::runOnModule(Module &M) {
   bool Changed = false;
+  Context = &M.getContext();
 
   TypeSymbolTable &ST = M.getTypeSymbolTable();
   std::set<const Type *> UsedTypes = getAnalysis<FindUsedTypes>().getTypes();
diff --git a/lib/Transforms/IPO/ExtractGV.cpp b/lib/Transforms/IPO/ExtractGV.cpp
index b7c5ca3e6e..fa3a055b20 100644
--- a/lib/Transforms/IPO/ExtractGV.cpp
+++ b/lib/Transforms/IPO/ExtractGV.cpp
@@ -44,6 +44,8 @@ namespace {
         return false;  // Nothing to extract
       }
       
+      Context = &M.getContext();
+      
       if (deleteStuff)
         return deleteGV();
       M.setModuleInlineAsm("");
diff --git a/lib/Transforms/IPO/GlobalDCE.cpp b/lib/Transforms/IPO/GlobalDCE.cpp
index 9c652b996a..9ecc494d9b 100644
--- a/lib/Transforms/IPO/GlobalDCE.cpp
+++ b/lib/Transforms/IPO/GlobalDCE.cpp
@@ -58,6 +58,8 @@ ModulePass *llvm::createGlobalDCEPass() { return new GlobalDCE(); }
 
 bool GlobalDCE::runOnModule(Module &M) {
   bool Changed = false;
+  Context = &M.getContext();
+  
   // Loop over the module, adding globals which are obviously necessary.
   for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
     Changed |= RemoveUnusedGlobalValue(*I);
diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index 398f78a098..8b3cf48cee 100644
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -2476,6 +2476,7 @@ bool GlobalOpt::OptimizeGlobalAliases(Module &M) {
 
 bool GlobalOpt::runOnModule(Module &M) {
   bool Changed = false;
+  Context = &M.getContext();
   
   // Try to find the llvm.globalctors list.
   GlobalVariable *GlobalCtors = FindGlobalCtors(M);
diff --git a/lib/Transforms/IPO/IPConstantPropagation.cpp b/lib/Transforms/IPO/IPConstantPropagation.cpp
index e27792a098..30834e2d67 100644
--- a/lib/Transforms/IPO/IPConstantPropagation.cpp
+++ b/lib/Transforms/IPO/IPConstantPropagation.cpp
@@ -56,6 +56,8 @@ bool IPCP::runOnModule(Module &M) {
   bool Changed = false;
   bool LocalChange = true;
 
+  Context = &M.getContext();
+
   // FIXME: instead of using smart algorithms, we just iterate until we stop
   // making changes.
   while (LocalChange) {
diff --git a/lib/Transforms/IPO/IndMemRemoval.cpp b/lib/Transforms/IPO/IndMemRemoval.cpp
index 2086a16683..7b9b0ccb8b 100644
--- a/lib/Transforms/IPO/IndMemRemoval.cpp
+++ b/lib/Transforms/IPO/IndMemRemoval.cpp
@@ -44,6 +44,8 @@ static RegisterPass<IndMemRemPass>
 X("indmemrem","Indirect Malloc and Free Removal");
 
 bool IndMemRemPass::runOnModule(Module &M) {
+  Context = &M.getContext();
+  
   // In theory, all direct calls of malloc and free should be promoted
   // to intrinsics.  Therefore, this goes through and finds where the
   // address of free or malloc are taken and replaces those with bounce
diff --git a/lib/Transforms/IPO/Internalize.cpp b/lib/Transforms/IPO/Internalize.cpp
index 5093ae90b5..9bc9172517 100644
--- a/lib/Transforms/IPO/Internalize.cpp
+++ b/lib/Transforms/IPO/Internalize.cpp
@@ -101,6 +101,8 @@ void InternalizePass::LoadFile(const char *Filename) {
 bool InternalizePass::runOnModule(Module &M) {
   CallGraph *CG = getAnalysisIfAvailable<CallGraph>();
   CallGraphNode *ExternalNode = CG ? CG->getExternalCallingNode() : 0;
+  
+  Context = &M.getContext();
 
   if (ExternalNames.empty()) {
     // Return if we're not in 'all but main' mode and have no external api
diff --git a/lib/Transforms/IPO/LowerSetJmp.cpp b/lib/Transforms/IPO/LowerSetJmp.cpp
index dfdf5b6f2d..bfa2bd9bc2 100644
--- a/lib/Transforms/IPO/LowerSetJmp.cpp
+++ b/lib/Transforms/IPO/LowerSetJmp.cpp
@@ -134,6 +134,8 @@ static RegisterPass<LowerSetJmp> X("lowersetjmp", "Lower Set Jump");
 bool LowerSetJmp::runOnModule(Module& M) {
   bool Changed = false;
 
+  Context = &M.getContext();
+
   // These are what the functions are called.
   Function* SetJmp = M.getFunction("llvm.setjmp");
   Function* LongJmp = M.getFunction("llvm.longjmp");
diff --git a/lib/Transforms/IPO/MergeFunctions.cpp b/lib/Transforms/IPO/MergeFunctions.cpp
index 9cc4daa9d2..e93a08784f 100644
--- a/lib/Transforms/IPO/MergeFunctions.cpp
+++ b/lib/Transforms/IPO/MergeFunctions.cpp
@@ -615,6 +615,8 @@ static bool fold(std::vector<Function *> &FnVec, unsigned i, unsigned j) {
 bool MergeFunctions::runOnModule(Module &M) {
   bool Changed = false;
 
+  Context = &M.getContext();
+
   std::map<unsigned long, std::vector<Function *> > FnMap;
 
   for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
diff --git a/lib/Transforms/IPO/PartialInlining.cpp b/lib/Transforms/IPO/PartialInlining.cpp
index 73ec9c1076..a6e090b317 100644
--- a/lib/Transforms/IPO/PartialInlining.cpp
+++ b/lib/Transforms/IPO/PartialInlining.cpp
@@ -141,6 +141,8 @@ Function* PartialInliner::unswitchFunction(Function* F) {
 }
 
 bool PartialInliner::runOnModule(Module& M) {
+  Context = &M.getContext();
+  
   std::vector<Function*> worklist;
   worklist.reserve(M.size());
   for (Module::iterator FI = M.begin(), FE = M.end(); FI != FE; ++FI)
diff --git a/lib/Transforms/IPO/PartialSpecialization.cpp b/lib/Transforms/IPO/PartialSpecialization.cpp
index 0e1fdb9915..3b2ce14860 100644
--- a/lib/Transforms/IPO/PartialSpecialization.cpp
+++ b/lib/Transforms/IPO/PartialSpecialization.cpp
@@ -108,6 +108,8 @@ SpecializeFunction(Function* F,
 
 
 bool PartSpec::runOnModule(Module &M) {
+  Context = &M.getContext();
+  
   bool Changed = false;
   for (Module::iterator I = M.begin(); I != M.end(); ++I) {
     Function &F = *I;
diff --git a/lib/Transforms/IPO/RaiseAllocations.cpp b/lib/Transforms/IPO/RaiseAllocations.cpp
index 6c32050909..8d2a9cbdd5 100644
--- a/lib/Transforms/IPO/RaiseAllocations.cpp
+++ b/lib/Transforms/IPO/RaiseAllocations.cpp
@@ -70,6 +70,7 @@ ModulePass *llvm::createRaiseAllocationsPass() {
 // function into the appropriate instruction.
 //
 void RaiseAllocations::doInitialization(Module &M) {
+  Context = &M.getContext();
 
   // Get Malloc and free prototypes if they exist!
   MallocFunc = M.getFunction("malloc");
diff --git a/lib/Transforms/IPO/StripDeadPrototypes.cpp b/lib/Transforms/IPO/StripDeadPrototypes.cpp
index a94d78e276..2a1779107a 100644
--- a/lib/Transforms/IPO/StripDeadPrototypes.cpp
+++ b/lib/Transforms/IPO/StripDeadPrototypes.cpp
@@ -42,6 +42,7 @@ X("strip-dead-prototypes", "Strip Unused Function Prototypes");
 
 bool StripDeadPrototypesPass::runOnModule(Module &M) {
   bool MadeChange = false;
+  Context = &M.getContext();
   
   // Erase dead function prototypes.
   for (Module::iterator I = M.begin(), E = M.end(); I != E; ) {
diff --git a/lib/Transforms/IPO/StripSymbols.cpp b/lib/Transforms/IPO/StripSymbols.cpp
index 323d1800a9..82a0952aa2 100644
--- a/lib/Transforms/IPO/StripSymbols.cpp
+++ b/lib/Transforms/IPO/StripSymbols.cpp
@@ -374,6 +374,7 @@ bool StripDebugInfo(Module &M) {
 }
 
 bool StripSymbols::runOnModule(Module &M) {
+  Context = &M.getContext();
   bool Changed = false;
   Changed |= StripDebugInfo(M);
   if (!OnlyDebugInfo)
diff --git a/lib/Transforms/Scalar/PredicateSimplifier.cpp b/lib/Transforms/Scalar/PredicateSimplifier.cpp
index 50d606311a..51de4f7c05 100644
--- a/lib/Transforms/Scalar/PredicateSimplifier.cpp
+++ b/lib/Transforms/Scalar/PredicateSimplifier.cpp
@@ -905,6 +905,7 @@ namespace {
   class VISIBILITY_HIDDEN ValueRanges {
     ValueNumbering &VN;
     TargetData *TD;
+    LLVMContext *Context;
 
     class VISIBILITY_HIDDEN ScopedRange {
       typedef std::vector<std::pair<DomTreeDFS::Node *, ConstantRange> >
@@ -1025,7 +1026,8 @@ namespace {
 
   public:
 
-    ValueRanges(ValueNumbering &VN, TargetData *TD) : VN(VN), TD(TD) {}
+    ValueRanges(ValueNumbering &VN, TargetData *TD, LLVMContext *C) :
+      VN(VN), TD(TD), Context(C) {}
 
 #ifndef NDEBUG
     virtual ~ValueRanges() {}
@@ -1167,7 +1169,7 @@ namespace {
         Value *V = VN.value(n); // XXX: redesign worklist.
         const Type *Ty = V->getType();
         if (Ty->isInteger()) {
-          addToWorklist(V, ConstantInt::get(*I), ICmpInst::ICMP_EQ, VRP);
+          addToWorklist(V, Context->getConstantInt(*I), ICmpInst::ICMP_EQ, VRP);
           return;
         } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) {
           assert(*I == 0 && "Pointer is null but not zero?");
@@ -1678,7 +1680,8 @@ namespace {
         Top(DTDFS->getNodeForBlock(TopInst->getParent())),
         TopBB(TopInst->getParent()),
         TopInst(TopInst),
-        modified(modified)
+        modified(modified),
+        Context(TopInst->getParent()->getContext())
     {
       assert(Top && "VRPSolver created for unreachable basic block.");
       assert(Top->getBlock() == TopInst->getParent() && "Context mismatch.");
@@ -1779,7 +1782,8 @@ namespace {
 
             if (ConstantInt *CI = dyn_cast<ConstantInt>(Canonical)) {
               if (ConstantInt *Arg = dyn_cast<ConstantInt>(LHS)) {
-                add(RHS, ConstantInt::get(CI->getValue() ^ Arg->getValue()),
+                add(RHS,
+                    Context->getConstantInt(CI->getValue() ^ Arg->getValue()),
                     ICmpInst::ICMP_EQ, NewContext);
               }
             }
@@ -2404,7 +2408,7 @@ namespace {
     DomTreeDFS::Node *Root = DTDFS->getRootNode();
     VN = new ValueNumbering(DTDFS);
     IG = new InequalityGraph(*VN, Root);
-    VR = new ValueRanges(*VN, TD);
+    VR = new ValueRanges(*VN, TD, Context);
     WorkList.push_back(Root);
 
     do {
@@ -2526,21 +2530,23 @@ namespace {
 
   void PredicateSimplifier::Forwards::visitSExtInst(SExtInst &SI) {
     VRPSolver VRP(VN, IG, UB, VR, PS->DTDFS, PS->modified, &SI);
+    LLVMContext *Context = SI.getParent()->getContext();
     uint32_t SrcBitWidth = cast<IntegerType>(SI.getSrcTy())->getBitWidth();
     uint32_t DstBitWidth = cast<IntegerType>(SI.getDestTy())->getBitWidth();
     APInt Min(APInt::getHighBitsSet(DstBitWidth, DstBitWidth-SrcBitWidth+1));
     APInt Max(APInt::getLowBitsSet(DstBitWidth, SrcBitWidth-1));
-    VRP.add(ConstantInt::get(Min), &SI, ICmpInst::ICMP_SLE);
-    VRP.add(ConstantInt::get(Max), &SI, ICmpInst::ICMP_SGE);
+    VRP.add(Context->getConstantInt(Min), &SI, ICmpInst::ICMP_SLE);
+    VRP.add(Context->getConstantInt(Max), &SI, ICmpInst::ICMP_SGE);
     VRP.solve();
   }
 
   void PredicateSimplifier::Forwards::visitZExtInst(ZExtInst &ZI) {
     VRPSolver VRP(VN, IG, UB, VR, PS->DTDFS, PS->modified, &ZI);
+    LLVMContext *Context = ZI.getParent()->getContext();
     uint32_t SrcBitWidth = cast<IntegerType>(ZI.getSrcTy())->getBitWidth();
     uint32_t DstBitWidth = cast<IntegerType>(ZI.getDestTy())->getBitWidth();
     APInt Max(APInt::getLowBitsSet(DstBitWidth, SrcBitWidth));
-    VRP.add(ConstantInt::get(Max), &ZI, ICmpInst::ICMP_UGE);
+    VRP.add(Context->getConstantInt(Max), &ZI, ICmpInst::ICMP_UGE);
     VRP.solve();
   }
 
@@ -2629,6 +2635,8 @@ namespace {
 
     Pred = IC.getPredicate();
 
+    LLVMContext *Context = IC.getParent()->getContext();
+
     if (ConstantInt *Op1 = dyn_cast<ConstantInt>(IC.getOperand(1))) {
       ConstantInt *NextVal = 0;
       switch (Pred) {
@@ -2636,12 +2644,12 @@ namespace {
         case ICmpInst::ICMP_SLT:
         case ICmpInst::ICMP_ULT:
           if (Op1->getValue() != 0)
-            NextVal = ConstantInt::get(Op1->getValue()-1);
+            NextVal = Context->getConstantInt(Op1->getValue()-1);
          break;
         case ICmpInst::ICMP_SGT:
         case ICmpInst::ICMP_UGT:
           if (!Op1->getValue().isAllOnesValue())
-            NextVal = ConstantInt::get(Op1->getValue()+1);
+            NextVal = Context->getConstantInt(Op1->getValue()+1);
          break;
       }
 
diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp
index 6ada2882e3..7fa1a08f8a 100644
--- a/lib/Transforms/Scalar/SCCP.cpp
+++ b/lib/Transforms/Scalar/SCCP.cpp
@@ -1662,7 +1662,10 @@ static bool AddressIsTaken(GlobalValue *GV) {
 }
 
 bool IPSCCP::runOnModule(Module &M) {
+  Context = &M.getContext();
+  
   SCCPSolver Solver;
+  Solver.setContext(Context);
 
   // Loop over all functions, marking arguments to those with their addresses
   // taken or that are external as overdefined.
diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index 8a28ca23b1..f285406b19 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -1730,6 +1730,8 @@ void SimplifyLibCalls::setDoesNotAlias(Function &F, unsigned n) {
 /// doInitialization - Add attributes to well-known functions.
 ///
 bool SimplifyLibCalls::doInitialization(Module &M) {
+  Context = &M.getContext();
+  
   Modified = false;
   for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
     Function &F = *I;
diff --git a/lib/Transforms/Utils/LowerInvoke.cpp b/lib/Transforms/Utils/LowerInvoke.cpp
index fae3edf0ad..1417f10e64 100644
--- a/lib/Transforms/Utils/LowerInvoke.cpp
+++ b/lib/Transforms/Utils/LowerInvoke.cpp
@@ -115,6 +115,8 @@ FunctionPass *llvm::createLowerInvokePass(const TargetLowering *TLI) {
 // doInitialization - Make sure that there is a prototype for abort in the
 // current module.
 bool LowerInvoke::doInitialization(Module &M) {
+  Context = &M.getContext();
+  
   const Type *VoidPtrTy = Context->getPointerTypeUnqual(Type::Int8Ty);
   AbortMessage = 0;
   if (ExpensiveEHSupport) {
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index 49dd6a06d8..680aed5902 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -190,67 +190,6 @@ ConstantInt *ConstantInt::CreateTrueFalseVals(bool WhichOne) {
   return WhichOne ? TheTrueVal : TheFalseVal;
 }
 
-
-namespace {
-  struct DenseMapAPIntKeyInfo {
-    struct KeyTy {
-      APInt val;
-      const Type* type;
-      KeyTy(const APInt& V, const Type* Ty) : val(V), type(Ty) {}
-      KeyTy(const KeyTy& that) : val(that.val), type(that.type) {}
-      bool operator==(const KeyTy& that) const {
-        return type == that.type && this->val == that.val;
-      }
-      bool operator!=(const KeyTy& that) const {
-        return !this->operator==(that);
-      }
-    };
-    static inline KeyTy getEmptyKey() { return KeyTy(APInt(1,0), 0); }
-    static inline KeyTy getTombstoneKey() { return KeyTy(APInt(1,1), 0); }
-    static unsigned getHashValue(const KeyTy &Key) {
-      return DenseMapInfo<void*>::getHashValue(Key.type) ^ 
-        Key.val.getHashValue();
-    }
-    static bool isEqual(const KeyTy &LHS, const KeyTy &RHS) {
-      return LHS == RHS;
-    }
-    static bool isPod() { return false; }
-  };
-}
-
-
-typedef DenseMap<DenseMapAPIntKeyInfo::KeyTy, ConstantInt*, 
-                 DenseMapAPIntKeyInfo> IntMapTy;
-static ManagedStatic<IntMapTy> IntConstants;
-
-// Get a ConstantInt from an APInt. Note that the value stored in the DenseMap 
-// as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
-// operator== and operator!= to ensure that the DenseMap doesn't attempt to
-// compare APInt's of different widths, which would violate an APInt class
-// invariant which generates an assertion.
-ConstantInt *ConstantInt::get(const APInt& V) {
-  // Get the corresponding integer type for the bit width of the value.
-  const IntegerType *ITy = IntegerType::get(V.getBitWidth());
-  // get an existing value or the insertion position
-  DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
-  
-  ConstantsLock->reader_acquire();
-  ConstantInt *&Slot = (*IntConstants)[Key]; 
-  ConstantsLock->reader_release();
-    
-  if (!Slot) {
-    sys::SmartScopedWriter<true> Writer(*ConstantsLock);
-    ConstantInt *&NewSlot = (*IntConstants)[Key]; 
-    if (!Slot) {
-      NewSlot = new ConstantInt(ITy, V);
-    }
-    
-    return NewSlot;
-  } else {
-    return Slot;
-  }
-}
-
 //===----------------------------------------------------------------------===//
 //                                ConstantFP
 //===----------------------------------------------------------------------===//
diff --git a/lib/VMCore/LLVMContext.cpp b/lib/VMCore/LLVMContext.cpp
index 73c93a2d6e..0372f31e67 100644
--- a/lib/VMCore/LLVMContext.cpp
+++ b/lib/VMCore/LLVMContext.cpp
@@ -29,7 +29,7 @@ LLVMContext& llvm::getGlobalContext() {
   return *GlobalContext;
 }
 
-LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl()) { }
+LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) { }
 LLVMContext::~LLVMContext() { delete pImpl; }
 
 // Constant accessors
@@ -117,7 +117,7 @@ Constant *LLVMContext::getConstantIntSigned(const Type *Ty, int64_t V) {
 }
 
 ConstantInt* LLVMContext::getConstantInt(const APInt& V) {
-  return ConstantInt::get(V);
+  return pImpl->getConstantInt(V);
 }
 
 Constant* LLVMContext::getConstantInt(const Type* Ty, const APInt& V) {
diff --git a/lib/VMCore/LLVMContextImpl.cpp b/lib/VMCore/LLVMContextImpl.cpp
new file mode 100644
index 0000000000..a92c19fe04
--- /dev/null
+++ b/lib/VMCore/LLVMContextImpl.cpp
@@ -0,0 +1,48 @@
+//===--------------- LLVMContextImpl.cpp - Implementation ------*- 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 LLVMContextImpl, the opaque implementation 
+//  of LLVMContext.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LLVMContextImpl.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/LLVMContext.h"
+using namespace llvm;
+
+// Get a ConstantInt from an APInt. Note that the value stored in the DenseMap 
+// as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
+// operator== and operator!= to ensure that the DenseMap doesn't attempt to
+// compare APInt's of different widths, which would violate an APInt class
+// invariant which generates an assertion.
+ConstantInt *LLVMContextImpl::getConstantInt(const APInt& V) {
+  // Get the corresponding integer type for the bit width of the value.
+  const IntegerType *ITy = Context.getIntegerType(V.getBitWidth());
+  // get an existing value or the insertion position
+  DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
+  
+  ConstantsLock.reader_acquire();
+  ConstantInt *&Slot = IntConstants[Key]; 
+  ConstantsLock.reader_release();
+    
+  if (!Slot) {
+    sys::SmartScopedWriter<true> Writer(ConstantsLock);
+    ConstantInt *&NewSlot = IntConstants[Key]; 
+    if (!Slot) {
+      NewSlot = new ConstantInt(ITy, V);
+    }
+    
+    return NewSlot;
+  } else {
+    return Slot;
+  }
+}
+
diff --git a/lib/VMCore/LLVMContextImpl.h b/lib/VMCore/LLVMContextImpl.h
index 4e089fb661..fbf29fdfc4 100644
--- a/lib/VMCore/LLVMContextImpl.h
+++ b/lib/VMCore/LLVMContextImpl.h
@@ -1,4 +1,4 @@
-//===-- llvm/SymbolTableListTraitsImpl.h - Implementation ------*- C++ -*--===//
+//===----------------- LLVMContextImpl.h - Implementation ------*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -15,9 +15,57 @@
 #ifndef LLVM_LLVMCONTEXT_IMPL_H
 #define LLVM_LLVMCONTEXT_IMPL_H
 
+#include "llvm/System/RWMutex.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/DenseMap.h"
+
 namespace llvm {
-class LLVMContextImpl {
 
+class ConstantInt;
+class LLVMContext;
+class Type;
+
+struct DenseMapAPIntKeyInfo {
+  struct KeyTy {
+    APInt val;
+    const Type* type;
+    KeyTy(const APInt& V, const Type* Ty) : val(V), type(Ty) {}
+    KeyTy(const KeyTy& that) : val(that.val), type(that.type) {}
+    bool operator==(const KeyTy& that) const {
+      return type == that.type && this->val == that.val;
+    }
+    bool operator!=(const KeyTy& that) const {
+      return !this->operator==(that);
+    }
+  };
+  static inline KeyTy getEmptyKey() { return KeyTy(APInt(1,0), 0); }
+  static inline KeyTy getTombstoneKey() { return KeyTy(APInt(1,1), 0); }
+  static unsigned getHashValue(const KeyTy &Key) {
+    return DenseMapInfo<void*>::getHashValue(Key.type) ^ 
+      Key.val.getHashValue();
+  }
+  static bool isEqual(const KeyTy &LHS, const KeyTy &RHS) {
+    return LHS == RHS;
+  }
+  static bool isPod() { return false; }
+};
+
+class LLVMContextImpl {
+  sys::SmartRWMutex<true> ConstantsLock;
+  
+  typedef DenseMap<DenseMapAPIntKeyInfo::KeyTy, ConstantInt*, 
+                   DenseMapAPIntKeyInfo> IntMapTy;
+  IntMapTy IntConstants;
+  
+  LLVMContext &Context;
+  LLVMContextImpl();
+  LLVMContextImpl(const LLVMContextImpl&);
+public:
+  LLVMContextImpl(LLVMContext &C) : Context(C) { }
+  
+  /// Return a ConstantInt with the specified value and an implied Type. The
+  /// type is the integer type that corresponds to the bit width of the value.
+  ConstantInt* getConstantInt(const APInt &V);
 };
 
 }