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134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
//===- llvm/Support/InstIterator.h - Classes for inst iteration -*- C++ -*-===//
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//
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// This file contains definitions of two iterators for iterating over the
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// instructions in a function. This is effectively a wrapper around a two level
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// iterator that can probably be genericized later.
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//
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// Note that this iterator gets invalidated any time that basic blocks or
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// instructions are moved around.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_INSTITERATOR_H
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#define LLVM_SUPPORT_INSTITERATOR_H
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#include "llvm/BasicBlock.h"
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#include "llvm/Function.h"
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// This class implements inst_begin() & inst_end() for
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// inst_iterator and const_inst_iterator's.
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//
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template <class _BB_t, class _BB_i_t, class _BI_t, class _II_t>
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class InstIterator {
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typedef _BB_t BBty;
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typedef _BB_i_t BBIty;
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typedef _BI_t BIty;
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typedef _II_t IIty;
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_BB_t &BBs; // BasicBlocksType
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_BB_i_t BB; // BasicBlocksType::iterator
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_BI_t BI; // BasicBlock::iterator
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public:
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typedef std::bidirectional_iterator_tag iterator_category;
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typedef IIty value_type;
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typedef unsigned difference_type;
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typedef BIty pointer;
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typedef IIty reference;
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// Copy constructor...
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template<typename A, typename B, typename C, typename D>
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InstIterator(const InstIterator<A,B,C,D> &II)
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: BBs(II.BBs), BB(II.BB), BI(II.BI) {}
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template<typename A, typename B, typename C, typename D>
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InstIterator(InstIterator<A,B,C,D> &II)
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: BBs(II.BBs), BB(II.BB), BI(II.BI) {}
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template<class M> InstIterator(M &m)
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: BBs(m.getBasicBlockList()), BB(BBs.begin()) { // begin ctor
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if (BB != BBs.end()) {
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BI = BB->begin();
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advanceToNextBB();
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}
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}
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template<class M> InstIterator(M &m, bool)
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: BBs(m.getBasicBlockList()), BB(BBs.end()) { // end ctor
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}
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// Accessors to get at the underlying iterators...
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inline BBIty &getBasicBlockIterator() { return BB; }
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inline BIty &getInstructionIterator() { return BI; }
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inline IIty operator*() const { return BI; }
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inline IIty operator->() const { return operator*(); }
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inline bool operator==(const InstIterator &y) const {
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return BB == y.BB && (BB == BBs.end() || BI == y.BI);
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}
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inline bool operator!=(const InstIterator& y) const {
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return !operator==(y);
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}
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InstIterator& operator++() {
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++BI;
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advanceToNextBB();
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return *this;
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}
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inline InstIterator operator++(int) {
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InstIterator tmp = *this; ++*this; return tmp;
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}
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InstIterator& operator--() {
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while (BB == BBs.end() || BI == BB->begin()) {
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--BB;
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BI = BB->end();
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}
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--BI;
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return *this;
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}
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inline InstIterator operator--(int) {
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InstIterator tmp = *this; --*this; return tmp;
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}
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inline bool atEnd() const { return BB == BBs.end(); }
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private:
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inline void advanceToNextBB() {
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// The only way that the II could be broken is if it is now pointing to
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// the end() of the current BasicBlock and there are successor BBs.
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while (BI == BB->end()) {
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++BB;
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if (BB == BBs.end()) break;
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BI = BB->begin();
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}
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}
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};
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typedef InstIterator<iplist<BasicBlock>,
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Function::iterator, BasicBlock::iterator,
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Instruction*> inst_iterator;
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typedef InstIterator<const iplist<BasicBlock>,
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Function::const_iterator,
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BasicBlock::const_iterator,
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const Instruction*> const_inst_iterator;
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inline inst_iterator inst_begin(Function *F) { return inst_iterator(*F); }
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inline inst_iterator inst_end(Function *F) { return inst_iterator(*F, true); }
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inline const_inst_iterator inst_begin(const Function *F) {
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return const_inst_iterator(*F);
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}
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inline const_inst_iterator inst_end(const Function *F) {
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return const_inst_iterator(*F, true);
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}
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inline inst_iterator inst_begin(Function &F) { return inst_iterator(F); }
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inline inst_iterator inst_end(Function &F) { return inst_iterator(F, true); }
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inline const_inst_iterator inst_begin(const Function &F) {
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return const_inst_iterator(F);
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}
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inline const_inst_iterator inst_end(const Function &F) {
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return const_inst_iterator(F, true);
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}
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#endif
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