MachineBasicBlock.h revision 3153b35a520f40954c2bded460e0b055f15727b9 
1//===-- llvm/CodeGen/MachineBasicBlock.h ------------------------*- C++ -*-===//
2//
3// Collect the sequence of machine instructions for a basic block.
4//
5//===----------------------------------------------------------------------===//
6
7#ifndef LLVM_CODEGEN_MACHINEBASICBLOCK_H
8#define LLVM_CODEGEN_MACHINEBASICBLOCK_H
9
10#include <vector>
11class BasicBlock;
12class MachineInstr;
13template <typename T> struct ilist_traits;
14
15class MachineBasicBlock {
16  std::vector<MachineInstr*> Insts;
17  MachineBasicBlock *Prev, *Next;
18  BasicBlock *BB;
19public:
20  MachineBasicBlock(BasicBlock *bb = 0) : Prev(0), Next(0), BB(bb) {}
21  ~MachineBasicBlock() {}
22
23  /// getBasicBlock - Return the LLVM basic block that this instance
24  /// corresponded to originally.
25  ///
26  BasicBlock *getBasicBlock() const { return BB; }
27
28  typedef std::vector<MachineInstr*>::iterator                iterator;
29  typedef std::vector<MachineInstr*>::const_iterator    const_iterator;
30  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
31  typedef std::reverse_iterator<iterator>             reverse_iterator;
32
33  unsigned size() const { return Insts.size(); }
34  bool empty() const { return Insts.empty(); }
35
36  MachineInstr * operator[](unsigned i) const { return Insts[i]; }
37  MachineInstr *&operator[](unsigned i)       { return Insts[i]; }
38
39  MachineInstr *front() const { return Insts.front(); }
40  MachineInstr *back()  const { return Insts.back(); }
41
42  iterator                begin()       { return Insts.begin();  }
43  const_iterator          begin() const { return Insts.begin();  }
44  iterator                  end()       { return Insts.end();    }
45  const_iterator            end() const { return Insts.end();    }
46  reverse_iterator       rbegin()       { return Insts.rbegin(); }
47  const_reverse_iterator rbegin() const { return Insts.rbegin(); }
48  reverse_iterator       rend  ()       { return Insts.rend();   }
49  const_reverse_iterator rend  () const { return Insts.rend();   }
50
51  void push_back(MachineInstr *MI) { Insts.push_back(MI); }
52  template<typename IT>
53  void insert(iterator I, IT S, IT E) { Insts.insert(I, S, E); }
54  iterator insert(iterator I, MachineInstr *M) { return Insts.insert(I, M); }
55
56  // erase - Remove the specified element or range from the instruction list.
57  // These functions do not delete any instructions removed.
58  //
59  iterator erase(iterator I)             { return Insts.erase(I); }
60  iterator erase(iterator I, iterator E) { return Insts.erase(I, E); }
61
62  MachineInstr *pop_back() {
63    MachineInstr *R = back();
64    Insts.pop_back();
65    return R;
66  }
67
68private:   // Methods used to maintain doubly linked list of blocks...
69  friend class ilist_traits<MachineBasicBlock>;
70
71  MachineBasicBlock *getPrev() const { return Prev; }
72  MachineBasicBlock *getNext() const { return Next; }
73  void setPrev(MachineBasicBlock *P) { Prev = P; }
74  void setNext(MachineBasicBlock *N) { Next = N; }
75};
76
77
78#endif
79