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//==- Serialize.h - Generic Object Serialization to Bitcode -------*- 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 the interface for generic object serialization to
// LLVM bitcode.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_BITCODE_SERIALIZE_OUTPUT
#define LLVM_BITCODE_SERIALIZE_OUTPUT

#include "llvm/Bitcode/Serialization.h"
#include "llvm/Bitcode/BitstreamWriter.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/DenseMap.h"

namespace llvm {

class Serializer {
  BitstreamWriter& Stream;
  SmallVector<uint64_t,10> Record;
  unsigned BlockLevel;
  
  typedef DenseMap<const void*,unsigned> MapTy;
  MapTy PtrMap;
  
public:
  explicit Serializer(BitstreamWriter& stream);
  ~Serializer();

  //==------------------------------------------------==//
  // Template-based dispatch to emit arbitrary types.
  //==------------------------------------------------==//
  
  template <typename T> 
  inline void Emit(const T& X) { SerializeTrait<T>::Emit(*this,X); }
  
  //==------------------------------------------------==//
  // Methods to emit primitive types.
  //==------------------------------------------------==//  
  
  void EmitInt(uint64_t X);
  void EmitSInt(int64_t X);
  
  inline void EmitBool(bool X) { EmitInt(X); }
  void EmitCStr(const char* beg, const char* end);
  void EmitCStr(const char* cstr);
  
  void EmitPtr(const void* ptr) { EmitInt(getPtrId(ptr)); }
  
  template <typename T>
  inline void EmitRef(const T& ref) { EmitPtr(&ref); }
  
  // Emit a pointer and the object pointed to.  (This has no relation to the
  // OwningPtr<> class.)
  template <typename T>
  inline void EmitOwnedPtr(T* ptr) {
    EmitPtr(ptr);
    if (ptr) SerializeTrait<T>::Emit(*this,*ptr);
  }
  
  
  //==------------------------------------------------==//
  // Batch emission of pointers.
  //==------------------------------------------------==//
    
  template <typename T1, typename T2>
  void BatchEmitOwnedPtrs(T1* p1, T2* p2) {
    EmitPtr(p1);
    EmitPtr(p2);
    if (p1) SerializeTrait<T1>::Emit(*this,*p1);
    if (p2) SerializeTrait<T2>::Emit(*this,*p2);    
  }

  template <typename T1, typename T2, typename T3>
  void BatchEmitOwnedPtrs(T1* p1, T2* p2, T3* p3) {
    EmitPtr(p1);
    EmitPtr(p2);
    EmitPtr(p3);
    if (p1) SerializeTrait<T1>::Emit(*this,*p1);
    if (p2) SerializeTrait<T2>::Emit(*this,*p2);
    if (p3) SerializeTrait<T3>::Emit(*this,*p3);
  }
  
  template <typename T1, typename T2, typename T3, typename T4>
  void BatchEmitOwnedPtrs(T1* p1, T2* p2, T3* p3, T4& p4) {
    EmitPtr(p1);
    EmitPtr(p2);
    EmitPtr(p3);
    EmitPtr(p4);
    if (p1) SerializeTrait<T1>::Emit(*this,*p1);
    if (p2) SerializeTrait<T2>::Emit(*this,*p2);
    if (p3) SerializeTrait<T3>::Emit(*this,*p3);
    if (p4) SerializeTrait<T4>::Emit(*this,*p4);
  }

  template <typename T>
  void BatchEmitOwnedPtrs(unsigned NumPtrs, T* const * Ptrs) {
    for (unsigned i = 0; i < NumPtrs; ++i)
      EmitPtr(Ptrs[i]);

    for (unsigned i = 0; i < NumPtrs; ++i)
      if (Ptrs[i]) SerializeTrait<T>::Emit(*this,*Ptrs[i]);
  }
  
  template <typename T1, typename T2>
  void BatchEmitOwnedPtrs(unsigned NumT1Ptrs, T1* const * Ptrs, T2* p2) {
    
    for (unsigned i = 0; i < NumT1Ptrs; ++i)
      EmitPtr(Ptrs[i]);
    
    EmitPtr(p2);
    
    for (unsigned i = 0; i < NumT1Ptrs; ++i)
      if (Ptrs[i]) SerializeTrait<T1>::Emit(*this,*Ptrs[i]);
    
    if (p2) SerializeTrait<T2>::Emit(*this,*p2);
  }
  
  template <typename T1, typename T2, typename T3>
  void BatchEmitOwnedPtrs(unsigned NumT1Ptrs, T1* const * Ptrs,
                          T2* p2, T3* p3) {
    
    for (unsigned i = 0; i < NumT1Ptrs; ++i)
      EmitPtr(Ptrs[i]);
    
    EmitPtr(p2);
    EmitPtr(p3);
    
    for (unsigned i = 0; i < NumT1Ptrs; ++i)
      if (Ptrs[i]) SerializeTrait<T1>::Emit(*this,*Ptrs[i]);
    
    if (p2) SerializeTrait<T2>::Emit(*this,*p2);
    if (p3) SerializeTrait<T3>::Emit(*this,*p3);
  }
  
  //==------------------------------------------------==//
  // Emitter Functors
  //==------------------------------------------------==//
  
  template <typename T>
  struct Emitter0 {
    Serializer& S;    
    Emitter0(Serializer& s) : S(s) {}
    void operator()(const T& x) const {
      SerializeTrait<T>::Emit(S,x);
    }
  };
  
  template <typename T, typename Arg1>
  struct Emitter1 {
    Serializer& S;
    Arg1 A1;
    
    Emitter1(Serializer& s, Arg1 a1) : S(s), A1(a1) {}
    void operator()(const T& x) const {
      SerializeTrait<T>::Emit(S,x,A1);
    }
  };
  
  template <typename T, typename Arg1, typename Arg2>
  struct Emitter2 {
    Serializer& S;
    Arg1 A1;
    Arg2 A2;
    
    Emitter2(Serializer& s, Arg1 a1, Arg2 a2) : S(s), A1(a1), A2(a2) {}
    void operator()(const T& x) const {
      SerializeTrait<T>::Emit(S,x,A1,A2);
    }
  };
  
  template <typename T>
  Emitter0<T> MakeEmitter() {
    return Emitter0<T>(*this);
  }
  
  template <typename T, typename Arg1>
  Emitter1<T,Arg1> MakeEmitter(Arg1 a1) {
    return Emitter1<T,Arg1>(*this,a1);
  }
  
  template <typename T, typename Arg1, typename Arg2>
  Emitter2<T,Arg1,Arg2> MakeEmitter(Arg1 a1, Arg2 a2) {
    return Emitter2<T,Arg1,Arg2>(*this,a1,a2);
  }
  
  //==------------------------------------------------==//
  // Misc. query and block/record manipulation methods.
  //==------------------------------------------------==//  
    
  bool isRegistered(const void* p) const;
  
  void FlushRecord() { if (inRecord()) EmitRecord(); }  
  void EnterBlock(unsigned BlockID = 8, unsigned CodeLen = 3);
  void ExitBlock();    
  
private:
  void EmitRecord();
  inline bool inRecord() { return Record.size() > 0; }
  SerializedPtrID getPtrId(const void* ptr);
};

} // end namespace llvm
#endif