//=== BasicValueFactory.h - Basic values for Path Sens analysis --*- C++ -*---//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file defines BasicValueFactory, a class that manages the lifetime
//  of APSInt objects and symbolic constraints used by GRExprEngine 
//  and related classes.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_ANALYSIS_BASICVALUEFACTORY_H
#define LLVM_CLANG_ANALYSIS_BASICVALUEFACTORY_H

#include "clang/Analysis/PathSensitive/SymbolManager.h"
#include "clang/AST/ASTContext.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/APSInt.h"

namespace llvm {
  class BumpPtrAllocator;
}

namespace clang {
  
class RVal;
  
class BasicValueFactory {
  typedef llvm::FoldingSet<llvm::FoldingSetNodeWrapper<llvm::APSInt> >
          APSIntSetTy;

  typedef llvm::FoldingSet<SymIntConstraint>
          SymIntCSetTy;
  

  ASTContext& Ctx;
  llvm::BumpPtrAllocator& BPAlloc;

  APSIntSetTy   APSIntSet;
  SymIntCSetTy  SymIntCSet;
  void*         PersistentRVals;
  void*         PersistentRValPairs;

public:
  BasicValueFactory(ASTContext& ctx, llvm::BumpPtrAllocator& Alloc) 
  : Ctx(ctx), BPAlloc(Alloc), PersistentRVals(0), PersistentRValPairs(0) {}

  ~BasicValueFactory();

  ASTContext& getContext() const { return Ctx; }  

  const llvm::APSInt& getValue(const llvm::APSInt& X);
  const llvm::APSInt& getValue(uint64_t X, unsigned BitWidth, bool isUnsigned);
  const llvm::APSInt& getValue(uint64_t X, QualType T);

  inline const llvm::APSInt& getZeroWithPtrWidth() {
    return getValue(0, Ctx.getTypeSize(Ctx.VoidPtrTy), true);
  }

  inline const llvm::APSInt& getTruthValue(bool b) {
    return getValue(b ? 1 : 0, Ctx.getTypeSize(Ctx.IntTy), false);
  }

  const SymIntConstraint& getConstraint(SymbolID sym, BinaryOperator::Opcode Op,
                                        const llvm::APSInt& V);

  const llvm::APSInt* EvaluateAPSInt(BinaryOperator::Opcode Op,
                                     const llvm::APSInt& V1,
                                     const llvm::APSInt& V2);
  
  const std::pair<RVal, uintptr_t>&
  getPersistentRValWithData(const RVal& V, uintptr_t Data);
  
  const std::pair<RVal, RVal>&
  getPersistentRValPair(const RVal& V1, const RVal& V2);  
};

} // end clang namespace

#endif