//===-- llvm/Use.h - Definition of the Use class ----------------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This defines the Use class. The Use class represents the operand of an
#ifndef LLVM_USE_H
#define LLVM_USE_H
-#include "llvm/ADT/ilist"
+#include "llvm/Support/Casting.h"
+#include "llvm/ADT/iterator"
namespace llvm {
-template<typename NodeTy> struct ilist_traits;
class Value;
class User;
Value *operator->() { return Val; }
const Value *operator->() const { return Val; }
+ Use *getNext() const { return Next; }
private:
- // NOTE!! The Next/Prev fields MUST stay at the start of this structure. The
- // end-token for the ilist is allocated as JUST the next/prev pair to reduce
- // memory usage instead of allocating an entire Use.
- struct NextPrevPtrs {
- Use *Next, *Prev;
- } UseLinks;
-
+ Use *Next, **Prev;
Value *Val;
User *U;
- friend struct ilist_traits<Use>;
-};
-template<>
-struct ilist_traits<Use> {
- static Use *getPrev(Use *N) { return N->UseLinks.Prev; }
- static Use *getNext(Use *N) { return N->UseLinks.Next; }
- static const Use *getPrev(const Use *N) { return N->UseLinks.Prev; }
- static const Use *getNext(const Use *N) { return N->UseLinks.Next; }
- static void setPrev(Use *N, Use *Prev) { N->UseLinks.Prev = Prev; }
- static void setNext(Use *N, Use *Next) { N->UseLinks.Next = Next; }
-
- /// createSentinal - this is used to create the end marker for the use list.
- /// Note that we only allocate a UseLinks structure, which is just enough to
- /// hold the next/prev pointers. This saves us 8 bytes of memory for every
- /// Value allocated.
- static Use *createSentinal() { return (Use*)new Use::NextPrevPtrs(); }
- static void destroySentinal(Use *S) { delete (Use::NextPrevPtrs*)S; }
-
- void addNodeToList(Use *NTy) {}
- void removeNodeFromList(Use *NTy) {}
- void transferNodesFromList(iplist<Use, ilist_traits> &L2,
- ilist_iterator<Use> first,
- ilist_iterator<Use> last) {}
-};
+ void addToList(Use **List) {
+ Next = *List;
+ if (Next) Next->Prev = &Next;
+ Prev = List;
+ *List = this;
+ }
+ void removeFromList() {
+ *Prev = Next;
+ if (Next) Next->Prev = Prev;
+ }
+ friend class Value;
+};
+// simplify_type - Allow clients to treat uses just like values when using
+// casting operators.
template<> struct simplify_type<Use> {
typedef Value* SimpleType;
static SimpleType getSimplifiedValue(const Use &Val) {
}
};
-struct UseListIteratorWrapper : public iplist<Use>::iterator {
- typedef iplist<Use>::iterator Super;
- UseListIteratorWrapper() {}
- UseListIteratorWrapper(const Super &RHS) : Super(RHS) {}
- UseListIteratorWrapper &operator=(const Super &RHS) {
- Super::operator=(RHS);
- return *this;
- }
- inline User *operator*() const;
- User *operator->() const { return operator*(); }
+template<typename UserTy> // UserTy == 'User' or 'const User'
+class value_use_iterator : public forward_iterator<UserTy*, ptrdiff_t> {
+ typedef forward_iterator<UserTy*, ptrdiff_t> super;
+ typedef value_use_iterator<UserTy> _Self;
+
+ Use *U;
+ value_use_iterator(Use *u) : U(u) {}
+ friend class Value;
+public:
+ typedef typename super::reference reference;
+ typedef typename super::pointer pointer;
- UseListIteratorWrapper operator--() { return Super::operator--(); }
- UseListIteratorWrapper operator++() { return Super::operator++(); }
+ value_use_iterator(const _Self &I) : U(I.U) {}
+ value_use_iterator() {}
- UseListIteratorWrapper operator--(int) { // postdecrement operators...
- UseListIteratorWrapper tmp = *this;
- --*this;
- return tmp;
+ bool operator==(const _Self &x) const {
+ return U == x.U;
}
- UseListIteratorWrapper operator++(int) { // postincrement operators...
- UseListIteratorWrapper tmp = *this;
- ++*this;
- return tmp;
+ bool operator!=(const _Self &x) const {
+ return !operator==(x);
}
-};
-
-struct UseListConstIteratorWrapper : public iplist<Use>::const_iterator {
- typedef iplist<Use>::const_iterator Super;
- UseListConstIteratorWrapper() {}
- UseListConstIteratorWrapper(const Super &RHS) : Super(RHS) {}
-
- // Allow conversion from non-const to const iterators
- UseListConstIteratorWrapper(const UseListIteratorWrapper &RHS) : Super(RHS) {}
- UseListConstIteratorWrapper(const iplist<Use>::iterator &RHS) : Super(RHS) {}
- UseListConstIteratorWrapper &operator=(const Super &RHS) {
- Super::operator=(RHS);
+ // Iterator traversal: forward iteration only
+ _Self &operator++() { // Preincrement
+ assert(U && "Cannot increment end iterator!");
+ U = U->getNext();
return *this;
}
+ _Self operator++(int) { // Postincrement
+ _Self tmp = *this; ++*this; return tmp;
+ }
+
+ // Retrieve a reference to the current SCC
+ UserTy *operator*() const {
+ assert(U && "Cannot increment end iterator!");
+ return U->getUser();
+ }
- inline const User *operator*() const;
- const User *operator->() const { return operator*(); }
+ UserTy *operator->() const { return operator*(); }
+
+ Use &getUse() const { return *U; }
+
+ /// getOperandNo - Return the operand # of this use in its User. Defined in
+ /// User.h
+ ///
+ unsigned getOperandNo() const;
+};
- UseListConstIteratorWrapper operator--() { return Super::operator--(); }
- UseListConstIteratorWrapper operator++() { return Super::operator++(); }
- UseListConstIteratorWrapper operator--(int) { // postdecrement operators...
- UseListConstIteratorWrapper tmp = *this;
- --*this;
- return tmp;
+template<> struct simplify_type<value_use_iterator<User> > {
+ typedef User* SimpleType;
+
+ static SimpleType getSimplifiedValue(const value_use_iterator<User> &Val) {
+ return *Val;
}
- UseListConstIteratorWrapper operator++(int) { // postincrement operators...
- UseListConstIteratorWrapper tmp = *this;
- ++*this;
- return tmp;
+};
+
+template<> struct simplify_type<const value_use_iterator<User> >
+ : public simplify_type<value_use_iterator<User> > {};
+
+template<> struct simplify_type<value_use_iterator<const User> > {
+ typedef const User* SimpleType;
+
+ static SimpleType getSimplifiedValue(const
+ value_use_iterator<const User> &Val) {
+ return *Val;
}
};
+template<> struct simplify_type<const value_use_iterator<const User> >
+ : public simplify_type<value_use_iterator<const User> > {};
+
} // End llvm namespace
#endif
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