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//===- InstIterator.h - Classes for inst iteration --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains definitions of two iterators for iterating over the
// instructions in a function. This is effectively a wrapper around a two level
// iterator that can probably be genericized later.
//
// Note that this iterator gets invalidated any time that basic blocks or
// instructions are moved around.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_INSTITERATOR_H
#define LLVM_IR_INSTITERATOR_H
#include "llvm/ADT/iterator_range.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/SymbolTableListTraits.h"
#include <iterator>
namespace llvm {
// This class implements inst_begin() & inst_end() for
// inst_iterator and const_inst_iterator's.
//
template <class BB_t, class BB_i_t, class BI_t, class II_t> class InstIterator {
using BBty = BB_t;
using BBIty = BB_i_t;
using BIty = BI_t;
using IIty = II_t;
BB_t *BBs; // BasicBlocksType
BB_i_t BB; // BasicBlocksType::iterator
BI_t BI; // BasicBlock::iterator
public:
using iterator_category = std::bidirectional_iterator_tag;
using value_type = IIty;
using difference_type = signed;
using pointer = IIty *;
using reference = IIty &;
// Default constructor
InstIterator() = default;
// Copy constructor...
template<typename A, typename B, typename C, typename D>
InstIterator(const InstIterator<A,B,C,D> &II)
: BBs(II.BBs), BB(II.BB), BI(II.BI) {}
template<typename A, typename B, typename C, typename D>
InstIterator(InstIterator<A,B,C,D> &II)
: BBs(II.BBs), BB(II.BB), BI(II.BI) {}
template<class M> InstIterator(M &m)
: BBs(&m.getBasicBlockList()), BB(BBs->begin()) { // begin ctor
if (BB != BBs->end()) {
BI = BB->begin();
advanceToNextBB();
}
}
template<class M> InstIterator(M &m, bool)
: BBs(&m.getBasicBlockList()), BB(BBs->end()) { // end ctor
}
// Accessors to get at the underlying iterators...
inline BBIty &getBasicBlockIterator() { return BB; }
inline BIty &getInstructionIterator() { return BI; }
inline reference operator*() const { return *BI; }
inline pointer operator->() const { return &operator*(); }
inline bool operator==(const InstIterator &y) const {
return BB == y.BB && (BB == BBs->end() || BI == y.BI);
}
inline bool operator!=(const InstIterator& y) const {
return !operator==(y);
}
InstIterator& operator++() {
++BI;
advanceToNextBB();
return *this;
}
inline InstIterator operator++(int) {
InstIterator tmp = *this; ++*this; return tmp;
}
InstIterator& operator--() {
while (BB == BBs->end() || BI == BB->begin()) {
--BB;
BI = BB->end();
}
--BI;
return *this;
}
inline InstIterator operator--(int) {
InstIterator tmp = *this; --*this; return tmp;
}
inline bool atEnd() const { return BB == BBs->end(); }
private:
inline void advanceToNextBB() {
// The only way that the II could be broken is if it is now pointing to
// the end() of the current BasicBlock and there are successor BBs.
while (BI == BB->end()) {
++BB;
if (BB == BBs->end()) break;
BI = BB->begin();
}
}
};
using inst_iterator =
InstIterator<SymbolTableList<BasicBlock>, Function::iterator,
BasicBlock::iterator, Instruction>;
using const_inst_iterator =
InstIterator<const SymbolTableList<BasicBlock>,
Function::const_iterator, BasicBlock::const_iterator,
const Instruction>;
using inst_range = iterator_range<inst_iterator>;
using const_inst_range = iterator_range<const_inst_iterator>;
inline inst_iterator inst_begin(Function *F) { return inst_iterator(*F); }
inline inst_iterator inst_end(Function *F) { return inst_iterator(*F, true); }
inline inst_range instructions(Function *F) {
return inst_range(inst_begin(F), inst_end(F));
}
inline const_inst_iterator inst_begin(const Function *F) {
return const_inst_iterator(*F);
}
inline const_inst_iterator inst_end(const Function *F) {
return const_inst_iterator(*F, true);
}
inline const_inst_range instructions(const Function *F) {
return const_inst_range(inst_begin(F), inst_end(F));
}
inline inst_iterator inst_begin(Function &F) { return inst_iterator(F); }
inline inst_iterator inst_end(Function &F) { return inst_iterator(F, true); }
inline inst_range instructions(Function &F) {
return inst_range(inst_begin(F), inst_end(F));
}
inline const_inst_iterator inst_begin(const Function &F) {
return const_inst_iterator(F);
}
inline const_inst_iterator inst_end(const Function &F) {
return const_inst_iterator(F, true);
}
inline const_inst_range instructions(const Function &F) {
return const_inst_range(inst_begin(F), inst_end(F));
}
} // end namespace llvm
#endif // LLVM_IR_INSTITERATOR_H
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