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//===- GetElementPtrTypeIterator.h ------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements an iterator for walking through the types indexed by
// getelementptr instructions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_GETELEMENTPTRTYPEITERATOR_H
#define LLVM_IR_GETELEMENTPTRTYPEITERATOR_H
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/User.h"
#include "llvm/ADT/PointerIntPair.h"
namespace llvm {
template<typename ItTy = User::const_op_iterator>
class generic_gep_type_iterator
: public std::iterator<std::forward_iterator_tag, Type *, ptrdiff_t> {
typedef std::iterator<std::forward_iterator_tag,
Type *, ptrdiff_t> super;
ItTy OpIt;
PointerIntPair<Type *, 1> CurTy;
unsigned AddrSpace;
generic_gep_type_iterator() {}
public:
static generic_gep_type_iterator begin(Type *Ty, ItTy It) {
generic_gep_type_iterator I;
I.CurTy.setPointer(Ty);
I.OpIt = It;
return I;
}
static generic_gep_type_iterator begin(Type *Ty, unsigned AddrSpace,
ItTy It) {
generic_gep_type_iterator I;
I.CurTy.setPointer(Ty);
I.CurTy.setInt(true);
I.AddrSpace = AddrSpace;
I.OpIt = It;
return I;
}
static generic_gep_type_iterator end(ItTy It) {
generic_gep_type_iterator I;
I.OpIt = It;
return I;
}
bool operator==(const generic_gep_type_iterator& x) const {
return OpIt == x.OpIt;
}
bool operator!=(const generic_gep_type_iterator& x) const {
return !operator==(x);
}
Type *operator*() const {
if (CurTy.getInt())
return CurTy.getPointer()->getPointerTo(AddrSpace);
return CurTy.getPointer();
}
Type *getIndexedType() const {
if (CurTy.getInt())
return CurTy.getPointer();
CompositeType *CT = cast<CompositeType>(CurTy.getPointer());
return CT->getTypeAtIndex(getOperand());
}
// This is a non-standard operator->. It allows you to call methods on the
// current type directly.
Type *operator->() const { return operator*(); }
Value *getOperand() const { return const_cast<Value *>(&**OpIt); }
generic_gep_type_iterator& operator++() { // Preincrement
if (CurTy.getInt()) {
CurTy.setInt(false);
} else if (CompositeType *CT =
dyn_cast<CompositeType>(CurTy.getPointer())) {
CurTy.setPointer(CT->getTypeAtIndex(getOperand()));
} else {
CurTy.setPointer(nullptr);
}
++OpIt;
return *this;
}
generic_gep_type_iterator operator++(int) { // Postincrement
generic_gep_type_iterator tmp = *this; ++*this; return tmp;
}
};
typedef generic_gep_type_iterator<> gep_type_iterator;
inline gep_type_iterator gep_type_begin(const User *GEP) {
auto *GEPOp = cast<GEPOperator>(GEP);
return gep_type_iterator::begin(
GEPOp->getSourceElementType(),
cast<PointerType>(GEPOp->getPointerOperandType()->getScalarType())
->getAddressSpace(),
GEP->op_begin() + 1);
}
inline gep_type_iterator gep_type_end(const User *GEP) {
return gep_type_iterator::end(GEP->op_end());
}
inline gep_type_iterator gep_type_begin(const User &GEP) {
auto &GEPOp = cast<GEPOperator>(GEP);
return gep_type_iterator::begin(
GEPOp.getSourceElementType(),
cast<PointerType>(GEPOp.getPointerOperandType()->getScalarType())
->getAddressSpace(),
GEP.op_begin() + 1);
}
inline gep_type_iterator gep_type_end(const User &GEP) {
return gep_type_iterator::end(GEP.op_end());
}
template<typename T>
inline generic_gep_type_iterator<const T *>
gep_type_begin(Type *Op0, ArrayRef<T> A) {
return generic_gep_type_iterator<const T *>::begin(Op0, A.begin());
}
template<typename T>
inline generic_gep_type_iterator<const T *>
gep_type_end(Type * /*Op0*/, ArrayRef<T> A) {
return generic_gep_type_iterator<const T *>::end(A.end());
}
} // end namespace llvm
#endif
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