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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, insertvalue and extractvalue instructions.
//
// It is an enhanced version of llvm::gep_type_iterator which only handles
// getelementptr.
//
//===----------------------------------------------------------------------===//
#ifndef KLEE_GETELEMENTPTRTYPEITERATOR_H
#define KLEE_GETELEMENTPTRTYPEITERATOR_H
#include "klee/Support/CompilerWarning.h"
DISABLE_WARNING_PUSH
DISABLE_WARNING_DEPRECATED_DECLARATIONS
#include "llvm/IR/User.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Constants.h"
DISABLE_WARNING_POP
#include "klee/Config/Version.h"
namespace klee {
template <typename ItTy = llvm::User::const_op_iterator>
class generic_gep_type_iterator {
using iterator_category = std::forward_iterator_tag;
using value_type = llvm::Type *;
using difference_type = ptrdiff_t;
using pointer = void;
using reference = void;
ItTy OpIt;
llvm::Type *CurTy;
generic_gep_type_iterator() {}
llvm::Value *asValue(llvm::Value *V) const { return V; }
llvm::Value *asValue(unsigned U) const {
return llvm::ConstantInt::get(CurTy->getContext(), llvm::APInt(32, U));
}
public:
static generic_gep_type_iterator begin(llvm::Type *Ty, ItTy It) {
generic_gep_type_iterator I;
I.CurTy = Ty;
I.OpIt = It;
return I;
}
static generic_gep_type_iterator end(ItTy It) {
generic_gep_type_iterator I;
I.CurTy = 0;
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);
}
llvm::Type *operator*() const { return CurTy; }
llvm::Type *getIndexedType() const {
#if LLVM_VERSION_CODE >= LLVM_VERSION(11, 0)
return llvm::GetElementPtrInst::getTypeAtIndex(CurTy, getOperand());
#else
llvm::CompositeType *CT = cast<llvm::CompositeType>(CurTy);
return CT->getTypeAtIndex(getOperand());
#endif
}
// This is a non-standard operator->. It allows you to call methods on the
// current type directly.
llvm::Type *operator->() const { return operator*(); }
llvm::Value *getOperand() const { return asValue(*OpIt); }
generic_gep_type_iterator& operator++() { // Preincrement
#if LLVM_VERSION_CODE >= LLVM_VERSION(11, 0)
if (isa<llvm::StructType>(CurTy) || isa<llvm::ArrayType>(CurTy) ||
isa<llvm::VectorType>(CurTy)) {
CurTy = llvm::GetElementPtrInst::getTypeAtIndex(CurTy, getOperand());
#else
if (llvm::CompositeType *CT = dyn_cast<llvm::CompositeType>(CurTy)) {
CurTy = CT->getTypeAtIndex(getOperand());
#endif
} else if (CurTy->isPointerTy()) {
CurTy = CurTy->getPointerElementType();
} else {
CurTy = 0;
}
++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;
typedef generic_gep_type_iterator<llvm::ExtractValueInst::idx_iterator> ev_type_iterator;
typedef generic_gep_type_iterator<llvm::InsertValueInst::idx_iterator> iv_type_iterator;
typedef generic_gep_type_iterator<llvm::SmallVector<unsigned, 4>::const_iterator> vce_type_iterator;
inline gep_type_iterator gep_type_begin(const llvm::User *GEP) {
return gep_type_iterator::begin(GEP->getOperand(0)->getType(),
GEP->op_begin()+1);
}
inline gep_type_iterator gep_type_end(const llvm::User *GEP) {
return gep_type_iterator::end(GEP->op_end());
}
inline gep_type_iterator gep_type_begin(const llvm::User &GEP) {
return gep_type_iterator::begin(GEP.getOperand(0)->getType(),
GEP.op_begin()+1);
}
inline gep_type_iterator gep_type_end(const llvm::User &GEP) {
return gep_type_iterator::end(GEP.op_end());
}
inline ev_type_iterator ev_type_begin(const llvm::ExtractValueInst *EV) {
return ev_type_iterator::begin(EV->getOperand(0)->getType(),
EV->idx_begin());
}
inline ev_type_iterator ev_type_end(const llvm::ExtractValueInst *EV) {
return ev_type_iterator::end(EV->idx_end());
}
inline iv_type_iterator iv_type_begin(const llvm::InsertValueInst *IV) {
return iv_type_iterator::begin(IV->getType(),
IV->idx_begin());
}
inline iv_type_iterator iv_type_end(const llvm::InsertValueInst *IV) {
return iv_type_iterator::end(IV->idx_end());
}
template <typename ItTy>
inline generic_gep_type_iterator<ItTy> gep_type_begin(llvm::Type *Op0, ItTy I,
ItTy E) {
return generic_gep_type_iterator<ItTy>::begin(Op0, I);
}
template <typename ItTy>
inline generic_gep_type_iterator<ItTy> gep_type_end(llvm::Type *Op0, ItTy I,
ItTy E) {
return generic_gep_type_iterator<ItTy>::end(E);
}
} // end namespace klee
#endif /* KLEE_GETELEMENTPTRTYPEITERATOR_H */
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