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pred_iterator down to a single ivar. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42859 91177308-0d34-0410-b5e6-96231b3b80d8
180 lines
4.7 KiB
C++
180 lines
4.7 KiB
C++
//===-- llvm/Use.h - Definition of the Use class ----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This defines the Use class. The Use class represents the operand of an
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// instruction or some other User instance which refers to a Value. The Use
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// class keeps the "use list" of the referenced value up to date.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_USE_H
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#define LLVM_USE_H
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#include "llvm/Support/Casting.h"
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#include "llvm/ADT/iterator"
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namespace llvm {
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class Value;
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class User;
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//===----------------------------------------------------------------------===//
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// Use Class
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//===----------------------------------------------------------------------===//
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// Use is here to make keeping the "use" list of a Value up-to-date really easy.
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//
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class Use {
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public:
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inline void init(Value *V, User *U);
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Use(Value *V, User *U) { init(V, U); }
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Use(const Use &U) { init(U.Val, U.U); }
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inline ~Use();
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/// Default ctor - This leaves the Use completely unitialized. The only thing
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/// that is valid to do with this use is to call the "init" method.
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inline Use() : Val(0) {}
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operator Value*() const { return Val; }
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Value *get() const { return Val; }
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User *getUser() const { return U; }
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inline void set(Value *Val);
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Value *operator=(Value *RHS) {
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set(RHS);
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return RHS;
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}
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const Use &operator=(const Use &RHS) {
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set(RHS.Val);
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return *this;
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}
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Value *operator->() { return Val; }
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const Value *operator->() const { return Val; }
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Use *getNext() const { return Next; }
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private:
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Use *Next, **Prev;
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Value *Val;
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User *U;
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void addToList(Use **List) {
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Next = *List;
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if (Next) Next->Prev = &Next;
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Prev = List;
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*List = this;
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}
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void removeFromList() {
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*Prev = Next;
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if (Next) Next->Prev = Prev;
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}
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friend class Value;
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};
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// simplify_type - Allow clients to treat uses just like values when using
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// casting operators.
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template<> struct simplify_type<Use> {
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typedef Value* SimpleType;
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static SimpleType getSimplifiedValue(const Use &Val) {
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return static_cast<SimpleType>(Val.get());
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}
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};
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template<> struct simplify_type<const Use> {
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typedef Value* SimpleType;
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static SimpleType getSimplifiedValue(const Use &Val) {
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return static_cast<SimpleType>(Val.get());
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}
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};
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template<typename UserTy> // UserTy == 'User' or 'const User'
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class value_use_iterator : public forward_iterator<UserTy*, ptrdiff_t> {
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typedef forward_iterator<UserTy*, ptrdiff_t> super;
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typedef value_use_iterator<UserTy> _Self;
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Use *U;
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value_use_iterator(Use *u) : U(u) {}
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friend class Value;
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public:
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typedef typename super::reference reference;
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typedef typename super::pointer pointer;
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value_use_iterator(const _Self &I) : U(I.U) {}
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value_use_iterator() {}
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bool operator==(const _Self &x) const {
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return U == x.U;
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}
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bool operator!=(const _Self &x) const {
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return !operator==(x);
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}
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/// atEnd - return true if this iterator is equal to use_end() on the value.
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bool atEnd() const { return U == 0; }
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// Iterator traversal: forward iteration only
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_Self &operator++() { // Preincrement
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assert(U && "Cannot increment end iterator!");
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U = U->getNext();
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return *this;
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}
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_Self operator++(int) { // Postincrement
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_Self tmp = *this; ++*this; return tmp;
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}
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// Retrieve a reference to the current SCC
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UserTy *operator*() const {
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assert(U && "Cannot increment end iterator!");
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return U->getUser();
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}
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UserTy *operator->() const { return operator*(); }
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Use &getUse() const { return *U; }
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/// getOperandNo - Return the operand # of this use in its User. Defined in
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/// User.h
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///
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unsigned getOperandNo() const;
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};
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template<> struct simplify_type<value_use_iterator<User> > {
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typedef User* SimpleType;
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static SimpleType getSimplifiedValue(const value_use_iterator<User> &Val) {
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return *Val;
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}
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};
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template<> struct simplify_type<const value_use_iterator<User> >
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: public simplify_type<value_use_iterator<User> > {};
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template<> struct simplify_type<value_use_iterator<const User> > {
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typedef const User* SimpleType;
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static SimpleType getSimplifiedValue(const
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value_use_iterator<const User> &Val) {
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return *Val;
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}
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};
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template<> struct simplify_type<const value_use_iterator<const User> >
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: public simplify_type<value_use_iterator<const User> > {};
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} // End llvm namespace
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#endif
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