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/GraphTraits.h"
19 #include "Support/ilist"
23 class MachineFunction;
27 class ilist_traits<MachineInstr> {
28 // this is only set by the MachineBasicBlock owning the ilist
29 friend class MachineBasicBlock;
30 MachineBasicBlock* parent;
33 ilist_traits<MachineInstr>() : parent(0) { }
35 static MachineInstr* getPrev(MachineInstr* N) { return N->prev; }
36 static MachineInstr* getNext(MachineInstr* N) { return N->next; }
38 static const MachineInstr*
39 getPrev(const MachineInstr* N) { return N->prev; }
41 static const MachineInstr*
42 getNext(const MachineInstr* N) { return N->next; }
44 static void setPrev(MachineInstr* N, MachineInstr* prev) { N->prev = prev; }
45 static void setNext(MachineInstr* N, MachineInstr* next) { N->next = next; }
47 static MachineInstr* createNode();
48 void addNodeToList(MachineInstr* N);
49 void removeNodeFromList(MachineInstr* N);
50 void transferNodesFromList(
51 iplist<MachineInstr, ilist_traits<MachineInstr> >& toList,
52 ilist_iterator<MachineInstr> first,
53 ilist_iterator<MachineInstr> last);
58 class MachineBasicBlock {
60 typedef ilist<MachineInstr> Instructions;
62 MachineBasicBlock *Prev, *Next;
64 std::vector<MachineBasicBlock *> Predecessors;
65 std::vector<MachineBasicBlock *> Successors;
67 MachineFunction *Parent;
70 MachineBasicBlock(const BasicBlock *bb = 0) : Prev(0), Next(0), BB(bb),
71 Number(-1), Parent(0) {
77 /// getBasicBlock - Return the LLVM basic block that this instance
78 /// corresponded to originally.
80 const BasicBlock *getBasicBlock() const { return BB; }
82 /// getParent - Return the MachineFunction containing this basic block.
84 const MachineFunction *getParent() const { return Parent; }
85 MachineFunction *getParent() { return Parent; }
87 typedef ilist<MachineInstr>::iterator iterator;
88 typedef ilist<MachineInstr>::const_iterator const_iterator;
89 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
90 typedef std::reverse_iterator<iterator> reverse_iterator;
92 unsigned size() const { return Insts.size(); }
93 bool empty() const { return Insts.empty(); }
95 MachineInstr& front() { return Insts.front(); }
96 MachineInstr& back() { return Insts.back(); }
98 iterator begin() { return Insts.begin(); }
99 const_iterator begin() const { return Insts.begin(); }
100 iterator end() { return Insts.end(); }
101 const_iterator end() const { return Insts.end(); }
102 reverse_iterator rbegin() { return Insts.rbegin(); }
103 const_reverse_iterator rbegin() const { return Insts.rbegin(); }
104 reverse_iterator rend () { return Insts.rend(); }
105 const_reverse_iterator rend () const { return Insts.rend(); }
107 // Machine-CFG iterators
108 typedef std::vector<MachineBasicBlock *>::iterator pred_iterator;
109 typedef std::vector<MachineBasicBlock *>::const_iterator const_pred_iterator;
110 typedef std::vector<MachineBasicBlock *>::iterator succ_iterator;
111 typedef std::vector<MachineBasicBlock *>::const_iterator const_succ_iterator;
113 pred_iterator pred_begin() { return Predecessors.begin (); }
114 const_pred_iterator pred_begin() const { return Predecessors.begin (); }
115 pred_iterator pred_end() { return Predecessors.end (); }
116 const_pred_iterator pred_end() const { return Predecessors.end (); }
117 unsigned pred_size() const { return Predecessors.size (); }
118 succ_iterator succ_begin() { return Successors.begin (); }
119 const_succ_iterator succ_begin() const { return Successors.begin (); }
120 succ_iterator succ_end() { return Successors.end (); }
121 const_succ_iterator succ_end() const { return Successors.end (); }
122 unsigned succ_size() const { return Successors.size (); }
124 // Machine-CFG mutators
126 /// addSuccessor - Add succ as a successor of this MachineBasicBlock.
127 /// The Predecessors list of succ is automatically updated.
129 void addSuccessor (MachineBasicBlock *succ) {
130 Successors.push_back (succ);
131 succ->addPredecessor (this);
134 /// removeSuccessor - Remove succ from the successors list of this
135 /// MachineBasicBlock. The Predecessors list of succ is automatically updated.
137 void removeSuccessor (MachineBasicBlock *succ) {
138 succ->removePredecessor (this);
139 std::vector<MachineBasicBlock *>::iterator goner =
140 std::find (Successors.begin(), Successors.end (), succ);
141 Successors.erase (goner);
144 /// getFirstTerminator - returns an iterator to the first terminator
145 /// instruction of this basic block. If a terminator does not exist,
147 iterator getFirstTerminator();
149 void push_back(MachineInstr *MI) { Insts.push_back(MI); }
150 template<typename IT>
151 void insert(iterator I, IT S, IT E) { Insts.insert(I, S, E); }
152 iterator insert(iterator I, MachineInstr *M) { return Insts.insert(I, M); }
154 // erase - Remove the specified element or range from the instruction list.
155 // These functions delete any instructions removed.
157 iterator erase(iterator I) { return Insts.erase(I); }
158 iterator erase(iterator I, iterator E) { return Insts.erase(I, E); }
159 MachineInstr *remove(MachineInstr *I) { return Insts.remove(I); }
160 void clear() { Insts.clear(); }
162 // Debugging methods.
164 void print(std::ostream &OS) const;
166 /// getNumber - MachineBasicBlocks are uniquely numbered at the function
167 /// level, unless they're not in a MachineFunction yet, in which case this
170 int getNumber() const { return Number; }
172 private: // Methods used to maintain doubly linked list of blocks...
173 friend class ilist_traits<MachineBasicBlock>;
175 MachineBasicBlock *getPrev() const { return Prev; }
176 MachineBasicBlock *getNext() const { return Next; }
177 void setPrev(MachineBasicBlock *P) { Prev = P; }
178 void setNext(MachineBasicBlock *N) { Next = N; }
180 // Machine-CFG mutators
182 /// addPredecessor - Remove pred as a predecessor of this MachineBasicBlock.
183 /// Don't do this unless you know what you're doing, because it doesn't
184 /// update pred's successors list. Use pred->addSuccessor instead.
186 void addPredecessor (MachineBasicBlock *pred) {
187 Predecessors.push_back (pred);
190 /// removePredecessor - Remove pred as a predecessor of this
191 /// MachineBasicBlock. Don't do this unless you know what you're
192 /// doing, because it doesn't update pred's successors list. Use
193 /// pred->removeSuccessor instead.
195 void removePredecessor (MachineBasicBlock *pred) {
196 std::vector<MachineBasicBlock *>::iterator goner =
197 std::find (Predecessors.begin(), Predecessors.end (), pred);
198 Predecessors.erase (goner);
203 //===--------------------------------------------------------------------===//
204 // GraphTraits specializations for machine basic block graphs (machine-CFGs)
205 //===--------------------------------------------------------------------===//
207 // Provide specializations of GraphTraits to be able to treat a
208 // MachineFunction as a graph of MachineBasicBlocks...
211 template <> struct GraphTraits<MachineBasicBlock *> {
212 typedef MachineBasicBlock NodeType;
213 typedef MachineBasicBlock::succ_iterator ChildIteratorType;
215 static NodeType *getEntryNode(MachineBasicBlock *BB) { return BB; }
216 static inline ChildIteratorType child_begin(NodeType *N) {
217 return N->succ_begin();
219 static inline ChildIteratorType child_end(NodeType *N) {
220 return N->succ_end();
224 template <> struct GraphTraits<const MachineBasicBlock *> {
225 typedef const MachineBasicBlock NodeType;
226 typedef MachineBasicBlock::const_succ_iterator ChildIteratorType;
228 static NodeType *getEntryNode(const MachineBasicBlock *BB) { return BB; }
229 static inline ChildIteratorType child_begin(NodeType *N) {
230 return N->succ_begin();
232 static inline ChildIteratorType child_end(NodeType *N) {
233 return N->succ_end();
237 // Provide specializations of GraphTraits to be able to treat a
238 // MachineFunction as a graph of MachineBasicBlocks... and to walk it
239 // in inverse order. Inverse order for a function is considered
240 // to be when traversing the predecessor edges of a MBB
241 // instead of the successor edges.
243 template <> struct GraphTraits<Inverse<MachineBasicBlock*> > {
244 typedef MachineBasicBlock NodeType;
245 typedef MachineBasicBlock::pred_iterator ChildIteratorType;
246 static NodeType *getEntryNode(Inverse<MachineBasicBlock *> G) {
249 static inline ChildIteratorType child_begin(NodeType *N) {
250 return N->pred_begin();
252 static inline ChildIteratorType child_end(NodeType *N) {
253 return N->pred_end();
257 template <> struct GraphTraits<Inverse<const MachineBasicBlock*> > {
258 typedef const MachineBasicBlock NodeType;
259 typedef MachineBasicBlock::const_pred_iterator ChildIteratorType;
260 static NodeType *getEntryNode(Inverse<const MachineBasicBlock*> G) {
263 static inline ChildIteratorType child_begin(NodeType *N) {
264 return N->pred_begin();
266 static inline ChildIteratorType child_end(NodeType *N) {
267 return N->pred_end();
271 } // End llvm namespace