llvm-6502/include/llvm/Support/InstIterator.h
Chris Lattner 2fbfdcffd3 Change references to the Method class to be references to the Function
class.  The Method class is obsolete (renamed) and all references to it
are being converted over to Function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2144 91177308-0d34-0410-b5e6-96231b3b80d8
2002-04-07 20:49:59 +00:00

117 lines
3.6 KiB
C++

//===-- llvm/Support/InstIterator.h - Classes for inst iteration -*- C++ -*--=//
//
// 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_INST_ITERATOR_H
#define LLVM_INST_ITERATOR_H
#include "llvm/BasicBlock.h"
#include "llvm/Function.h"
// This class is 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 {
typedef _BB_t BBty;
typedef _BB_i_t BBIty;
typedef _BI_t BIty;
typedef _II_t IIty;
_BB_t &BBs; // BasicBlocksType
_BB_i_t BB; // BasicBlocksType::iterator
_BI_t BI; // BasicBlock::iterator
public:
typedef std::bidirectional_iterator_tag iterator_category;
typedef IIty value_type;
typedef unsigned difference_type;
typedef BIty pointer;
typedef IIty reference;
template<class M> InstIterator(M &m)
: BBs(m.getBasicBlocks()), BB(BBs.begin()) { // begin ctor
if (BB != BBs.end()) {
BI = (*BB)->begin();
advanceToNextBB();
}
}
template<class M> InstIterator(M &m, bool)
: BBs(m.getBasicBlocks()), BB(BBs.end()) { // end ctor
}
// Accessors to get at the underlying iterators...
inline BBIty &getBasicBlockIterator() { return BB; }
inline BIty &getInstructionIterator() { return BI; }
inline IIty operator*() const { return *BI; }
inline IIty 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();
}
}
};
typedef InstIterator<ValueHolder<BasicBlock, Function, Function>,
Function::iterator, BasicBlock::iterator,
Instruction*> inst_iterator;
typedef InstIterator<const ValueHolder<BasicBlock, Function, Function>,
Function::const_iterator,
BasicBlock::const_iterator,
const Instruction*> 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 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);
}
#endif