//===-- llvm/CodeGen/MachineBasicBlock.h ------------------------*- C++ -*-===//
// 
// Collect the sequence of machine instructions for a basic block.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_MACHINEBASICBLOCK_H
#define LLVM_CODEGEN_MACHINEBASICBLOCK_H

#include <vector>
class BasicBlock;
class MachineInstr;
template <typename T> struct ilist_traits;

class MachineBasicBlock {
  std::vector<MachineInstr*> Insts;
  MachineBasicBlock *Prev, *Next;
  BasicBlock *BB;
public:
  MachineBasicBlock(BasicBlock *bb = 0) : Prev(0), Next(0), BB(bb) {}
  ~MachineBasicBlock() {}
  
  /// getBasicBlock - Return the LLVM basic block that this instance
  /// corresponded to originally.
  ///
  BasicBlock *getBasicBlock() const { return BB; }
  
  typedef std::vector<MachineInstr*>::iterator                iterator;
  typedef std::vector<MachineInstr*>::const_iterator    const_iterator;
  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
  typedef std::reverse_iterator<iterator>             reverse_iterator;

  unsigned size() const { return Insts.size(); }
  bool empty() const { return Insts.empty(); }

  MachineInstr * operator[](unsigned i) const { return Insts[i]; }
  MachineInstr *&operator[](unsigned i)       { return Insts[i]; }

  MachineInstr *front() const { return Insts.front(); }
  MachineInstr *back()  const { return Insts.back(); }

  iterator                begin()       { return Insts.begin();  }
  const_iterator          begin() const { return Insts.begin();  }
  iterator                  end()       { return Insts.end();    }
  const_iterator            end() const { return Insts.end();    }
  reverse_iterator       rbegin()       { return Insts.rbegin(); }
  const_reverse_iterator rbegin() const { return Insts.rbegin(); }
  reverse_iterator       rend  ()       { return Insts.rend();   }
  const_reverse_iterator rend  () const { return Insts.rend();   }

  void push_back(MachineInstr *MI) { Insts.push_back(MI); }
  template<typename IT>
  void insert(iterator I, IT S, IT E) { Insts.insert(I, S, E); }
  iterator insert(iterator I, MachineInstr *M) { return Insts.insert(I, M); }

  // erase - Remove the specified element or range from the instruction list.
  // These functions do not delete any instructions removed.
  //
  iterator erase(iterator I)             { return Insts.erase(I); }
  iterator erase(iterator I, iterator E) { return Insts.erase(I, E); }

  MachineInstr *pop_back() {
    MachineInstr *R = back();
    Insts.pop_back();
    return R;
  }

private:   // Methods used to maintain doubly linked list of blocks...
  friend class ilist_traits<MachineBasicBlock>;

  MachineBasicBlock *getPrev() const { return Prev; }
  MachineBasicBlock *getNext() const { return Next; }
  void setPrev(MachineBasicBlock *P) { Prev = P; }
  void setNext(MachineBasicBlock *N) { Next = N; }
};


#endif