1 //===-- llvm/CodeGen/MachineBasicBlock.h ------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Collect the sequence of machine instructions for a basic block.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CODEGEN_MACHINEBASICBLOCK_H
15 #define LLVM_CODEGEN_MACHINEBASICBLOCK_H
17 #include "llvm/CodeGen/MachineInstr.h"
18 #include "Support/ilist"
25 class ilist_traits<MachineInstr>
27 typedef ilist_traits<MachineInstr> self;
29 // this is only set by the MachineBasicBlock owning the ilist
30 friend class MachineBasicBlock;
31 MachineBasicBlock* parent;
34 ilist_traits<MachineInstr>() : parent(0) { }
36 static MachineInstr* getPrev(MachineInstr* N) { return N->prev; }
37 static MachineInstr* getNext(MachineInstr* N) { return N->next; }
39 static const MachineInstr*
40 getPrev(const MachineInstr* N) { return N->prev; }
42 static const MachineInstr*
43 getNext(const MachineInstr* N) { return N->next; }
45 static void setPrev(MachineInstr* N, MachineInstr* prev) { N->prev = prev; }
46 static void setNext(MachineInstr* N, MachineInstr* next) { N->next = next; }
48 static MachineInstr* createNode() { return new MachineInstr(0, 0); }
50 void addNodeToList(MachineInstr* N) {
51 assert(N->parent == 0 && "machine instruction already in a basic block");
55 void removeNodeFromList(MachineInstr* N) {
56 assert(N->parent != 0 && "machine instruction not in a basic block");
60 void transferNodesFromList(iplist<MachineInstr, self>& toList,
61 ilist_iterator<MachineInstr> first,
62 ilist_iterator<MachineInstr> last) {
63 if (parent != toList.parent)
64 for (; first != last; ++first)
65 first->parent = toList.parent;
71 class MachineBasicBlock {
73 typedef ilist<MachineInstr> Instructions;
75 MachineBasicBlock *Prev, *Next;
78 MachineBasicBlock(const BasicBlock *bb = 0) : Prev(0), Next(0), BB(bb) {
81 ~MachineBasicBlock() {}
83 /// getBasicBlock - Return the LLVM basic block that this instance
84 /// corresponded to originally.
86 const BasicBlock *getBasicBlock() const { return BB; }
88 typedef ilist<MachineInstr>::iterator iterator;
89 typedef ilist<MachineInstr>::const_iterator const_iterator;
90 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
91 typedef std::reverse_iterator<iterator> reverse_iterator;
93 unsigned size() const { return Insts.size(); }
94 bool empty() const { return Insts.empty(); }
96 const MachineInstr& operator[](unsigned i) const {
97 const_iterator it = Insts.begin();
101 MachineInstr& operator[](unsigned i) {
102 iterator it = Insts.begin();
107 MachineInstr& front() { return Insts.front(); }
108 MachineInstr& back() { return Insts.back(); }
110 iterator begin() { return Insts.begin(); }
111 const_iterator begin() const { return Insts.begin(); }
112 iterator end() { return Insts.end(); }
113 const_iterator end() const { return Insts.end(); }
114 reverse_iterator rbegin() { return Insts.rbegin(); }
115 const_reverse_iterator rbegin() const { return Insts.rbegin(); }
116 reverse_iterator rend () { return Insts.rend(); }
117 const_reverse_iterator rend () const { return Insts.rend(); }
119 void push_back(MachineInstr *MI) { Insts.push_back(MI); }
120 template<typename IT>
121 void insert(iterator I, IT S, IT E) { Insts.insert(I, S, E); }
122 iterator insert(iterator I, MachineInstr *M) { return Insts.insert(I, M); }
124 // erase - Remove the specified element or range from the instruction list.
125 // These functions delete any instructions removed.
127 iterator erase(iterator I) { return Insts.erase(I); }
128 iterator erase(iterator I, iterator E) { return Insts.erase(I, E); }
129 MachineInstr* remove(iterator &I) { return Insts.remove(I); }
131 // Debugging methods.
133 void print(std::ostream &OS) const;
135 private: // Methods used to maintain doubly linked list of blocks...
136 friend class ilist_traits<MachineBasicBlock>;
138 MachineBasicBlock *getPrev() const { return Prev; }
139 MachineBasicBlock *getNext() const { return Next; }
140 void setPrev(MachineBasicBlock *P) { Prev = P; }
141 void setNext(MachineBasicBlock *N) { Next = N; }
144 } // End llvm namespace