1 //===- InstIterator.h - Classes for inst iteration --------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains definitions of two iterators for iterating over the
11 // instructions in a function. This is effectively a wrapper around a two level
12 // iterator that can probably be genericized later.
14 // Note that this iterator gets invalidated any time that basic blocks or
15 // instructions are moved around.
17 //===----------------------------------------------------------------------===//
19 #ifndef LLVM_IR_INSTITERATOR_H
20 #define LLVM_IR_INSTITERATOR_H
22 #include "llvm/ADT/iterator_range.h"
23 #include "llvm/IR/BasicBlock.h"
24 #include "llvm/IR/Function.h"
25 #include "llvm/IR/SymbolTableListTraits.h"
30 // This class implements inst_begin() & inst_end() for
31 // inst_iterator and const_inst_iterator's.
33 template <class BB_t, class BB_i_t, class BI_t, class II_t> class InstIterator {
38 BB_t *BBs; // BasicBlocksType
39 BB_i_t BB; // BasicBlocksType::iterator
40 BI_t BI; // BasicBlock::iterator
43 using iterator_category = std::bidirectional_iterator_tag;
44 using value_type = IIty;
45 using difference_type = signed;
46 using pointer = IIty *;
47 using reference = IIty &;
49 // Default constructor
50 InstIterator() = default;
52 // Copy constructor...
53 template<typename A, typename B, typename C, typename D>
54 InstIterator(const InstIterator<A,B,C,D> &II)
55 : BBs(II.BBs), BB(II.BB), BI(II.BI) {}
57 template<typename A, typename B, typename C, typename D>
58 InstIterator(InstIterator<A,B,C,D> &II)
59 : BBs(II.BBs), BB(II.BB), BI(II.BI) {}
61 template<class M> InstIterator(M &m)
62 : BBs(&m.getBasicBlockList()), BB(BBs->begin()) { // begin ctor
63 if (BB != BBs->end()) {
69 template<class M> InstIterator(M &m, bool)
70 : BBs(&m.getBasicBlockList()), BB(BBs->end()) { // end ctor
73 // Accessors to get at the underlying iterators...
74 inline BBIty &getBasicBlockIterator() { return BB; }
75 inline BIty &getInstructionIterator() { return BI; }
77 inline reference operator*() const { return *BI; }
78 inline pointer operator->() const { return &operator*(); }
80 inline bool operator==(const InstIterator &y) const {
81 return BB == y.BB && (BB == BBs->end() || BI == y.BI);
83 inline bool operator!=(const InstIterator& y) const {
84 return !operator==(y);
87 InstIterator& operator++() {
92 inline InstIterator operator++(int) {
93 InstIterator tmp = *this; ++*this; return tmp;
96 InstIterator& operator--() {
97 while (BB == BBs->end() || BI == BB->begin()) {
104 inline InstIterator operator--(int) {
105 InstIterator tmp = *this; --*this; return tmp;
108 inline bool atEnd() const { return BB == BBs->end(); }
111 inline void advanceToNextBB() {
112 // The only way that the II could be broken is if it is now pointing to
113 // the end() of the current BasicBlock and there are successor BBs.
114 while (BI == BB->end()) {
116 if (BB == BBs->end()) break;
122 using inst_iterator =
123 InstIterator<SymbolTableList<BasicBlock>, Function::iterator,
124 BasicBlock::iterator, Instruction>;
125 using const_inst_iterator =
126 InstIterator<const SymbolTableList<BasicBlock>,
127 Function::const_iterator, BasicBlock::const_iterator,
129 using inst_range = iterator_range<inst_iterator>;
130 using const_inst_range = iterator_range<const_inst_iterator>;
132 inline inst_iterator inst_begin(Function *F) { return inst_iterator(*F); }
133 inline inst_iterator inst_end(Function *F) { return inst_iterator(*F, true); }
134 inline inst_range instructions(Function *F) {
135 return inst_range(inst_begin(F), inst_end(F));
137 inline const_inst_iterator inst_begin(const Function *F) {
138 return const_inst_iterator(*F);
140 inline const_inst_iterator inst_end(const Function *F) {
141 return const_inst_iterator(*F, true);
143 inline const_inst_range instructions(const Function *F) {
144 return const_inst_range(inst_begin(F), inst_end(F));
146 inline inst_iterator inst_begin(Function &F) { return inst_iterator(F); }
147 inline inst_iterator inst_end(Function &F) { return inst_iterator(F, true); }
148 inline inst_range instructions(Function &F) {
149 return inst_range(inst_begin(F), inst_end(F));
151 inline const_inst_iterator inst_begin(const Function &F) {
152 return const_inst_iterator(F);
154 inline const_inst_iterator inst_end(const Function &F) {
155 return const_inst_iterator(F, true);
157 inline const_inst_range instructions(const Function &F) {
158 return const_inst_range(inst_begin(F), inst_end(F));
161 } // end namespace llvm
163 #endif // LLVM_IR_INSTITERATOR_H