1 //===- llvm/Support/InstIterator.h - Classes for inst iteration -*- 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 // 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_SUPPORT_INSTITERATOR_H
20 #define LLVM_SUPPORT_INSTITERATOR_H
22 #include "llvm/BasicBlock.h"
23 #include "llvm/Function.h"
25 // This class implements inst_begin() & inst_end() for
26 // inst_iterator and const_inst_iterator's.
28 template <class _BB_t, class _BB_i_t, class _BI_t, class _II_t>
31 typedef _BB_i_t BBIty;
34 _BB_t &BBs; // BasicBlocksType
35 _BB_i_t BB; // BasicBlocksType::iterator
36 _BI_t BI; // BasicBlock::iterator
38 typedef std::bidirectional_iterator_tag iterator_category;
39 typedef IIty value_type;
40 typedef unsigned difference_type;
42 typedef IIty reference;
44 // Copy constructor...
45 template<typename A, typename B, typename C, typename D>
46 InstIterator(const InstIterator<A,B,C,D> &II)
47 : BBs(II.BBs), BB(II.BB), BI(II.BI) {}
49 template<typename A, typename B, typename C, typename D>
50 InstIterator(InstIterator<A,B,C,D> &II)
51 : BBs(II.BBs), BB(II.BB), BI(II.BI) {}
53 template<class M> InstIterator(M &m)
54 : BBs(m.getBasicBlockList()), BB(BBs.begin()) { // begin ctor
55 if (BB != BBs.end()) {
61 template<class M> InstIterator(M &m, bool)
62 : BBs(m.getBasicBlockList()), BB(BBs.end()) { // end ctor
65 // Accessors to get at the underlying iterators...
66 inline BBIty &getBasicBlockIterator() { return BB; }
67 inline BIty &getInstructionIterator() { return BI; }
69 inline IIty operator*() const { return BI; }
70 inline IIty operator->() const { return operator*(); }
72 inline bool operator==(const InstIterator &y) const {
73 return BB == y.BB && (BB == BBs.end() || BI == y.BI);
75 inline bool operator!=(const InstIterator& y) const {
76 return !operator==(y);
79 InstIterator& operator++() {
84 inline InstIterator operator++(int) {
85 InstIterator tmp = *this; ++*this; return tmp;
88 InstIterator& operator--() {
89 while (BB == BBs.end() || BI == BB->begin()) {
96 inline InstIterator operator--(int) {
97 InstIterator tmp = *this; --*this; return tmp;
100 inline bool atEnd() const { return BB == BBs.end(); }
103 inline void advanceToNextBB() {
104 // The only way that the II could be broken is if it is now pointing to
105 // the end() of the current BasicBlock and there are successor BBs.
106 while (BI == BB->end()) {
108 if (BB == BBs.end()) break;
115 typedef InstIterator<iplist<BasicBlock>,
116 Function::iterator, BasicBlock::iterator,
117 Instruction*> inst_iterator;
118 typedef InstIterator<const iplist<BasicBlock>,
119 Function::const_iterator,
120 BasicBlock::const_iterator,
121 const Instruction*> const_inst_iterator;
123 inline inst_iterator inst_begin(Function *F) { return inst_iterator(*F); }
124 inline inst_iterator inst_end(Function *F) { return inst_iterator(*F, true); }
125 inline const_inst_iterator inst_begin(const Function *F) {
126 return const_inst_iterator(*F);
128 inline const_inst_iterator inst_end(const Function *F) {
129 return const_inst_iterator(*F, true);
131 inline inst_iterator inst_begin(Function &F) { return inst_iterator(F); }
132 inline inst_iterator inst_end(Function &F) { return inst_iterator(F, true); }
133 inline const_inst_iterator inst_begin(const Function &F) {
134 return const_inst_iterator(F);
136 inline const_inst_iterator inst_end(const Function &F) {
137 return const_inst_iterator(F, true);