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+//===- llvm/Use.h - Definition of the Use class -----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// This defines the Use class. The Use class represents the operand of an
+/// instruction or some other User instance which refers to a Value. The Use
+/// class keeps the "use list" of the referenced value up to date.
+///
+/// Pointer tagging is used to efficiently find the User corresponding to a Use
+/// without having to store a User pointer in every Use. A User is preceded in
+/// memory by all the Uses corresponding to its operands, and the low bits of
+/// one of the fields (Prev) of the Use class are used to encode offsets to be
+/// able to find that User given a pointer to any Use. For details, see:
+///
+/// http://www.llvm.org/docs/ProgrammersManual.html#UserLayout
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_USE_H
+#define LLVM_IR_USE_H
+
+#include "llvm-c/Types.h"
+#include "llvm/ADT/PointerIntPair.h"
+#include "llvm/Support/CBindingWrapping.h"
+#include "llvm/Support/Compiler.h"
+
+namespace llvm {
+
+template <typename> struct simplify_type;
+class User;
+class Value;
+
+/// \brief A Use represents the edge between a Value definition and its users.
+///
+/// This is notionally a two-dimensional linked list. It supports traversing
+/// all of the uses for a particular value definition. It also supports jumping
+/// directly to the used value when we arrive from the User's operands, and
+/// jumping directly to the User when we arrive from the Value's uses.
+///
+/// The pointer to the used Value is explicit, and the pointer to the User is
+/// implicit. The implicit pointer is found via a waymarking algorithm
+/// described in the programmer's manual:
+///
+/// http://www.llvm.org/docs/ProgrammersManual.html#the-waymarking-algorithm
+///
+/// This is essentially the single most memory intensive object in LLVM because
+/// of the number of uses in the system. At the same time, the constant time
+/// operations it allows are essential to many optimizations having reasonable
+/// time complexity.
+class Use {
+public:
+ Use(const Use &U) = delete;
+
+ /// \brief Provide a fast substitute to std::swap<Use>
+ /// that also works with less standard-compliant compilers
+ void swap(Use &RHS);
+
+ /// Pointer traits for the UserRef PointerIntPair. This ensures we always
+ /// use the LSB regardless of pointer alignment on different targets.
+ struct UserRefPointerTraits {
+ static inline void *getAsVoidPointer(User *P) { return P; }
+
+ static inline User *getFromVoidPointer(void *P) {
+ return (User *)P;
+ }
+
+ enum { NumLowBitsAvailable = 1 };
+ };
+
+ // A type for the word following an array of hung-off Uses in memory, which is
+ // a pointer back to their User with the bottom bit set.
+ using UserRef = PointerIntPair<User *, 1, unsigned, UserRefPointerTraits>;
+
+ /// Pointer traits for the Prev PointerIntPair. This ensures we always use
+ /// the two LSBs regardless of pointer alignment on different targets.
+ struct PrevPointerTraits {
+ static inline void *getAsVoidPointer(Use **P) { return P; }
+
+ static inline Use **getFromVoidPointer(void *P) {
+ return (Use **)P;
+ }
+
+ enum { NumLowBitsAvailable = 2 };
+ };
+
+private:
+ /// Destructor - Only for zap()
+ ~Use() {
+ if (Val)
+ removeFromList();
+ }
+
+ enum PrevPtrTag { zeroDigitTag, oneDigitTag, stopTag, fullStopTag };
+
+ /// Constructor
+ Use(PrevPtrTag tag) { Prev.setInt(tag); }
+
+public:
+ friend class Value;
+
+ operator Value *() const { return Val; }
+ Value *get() const { return Val; }
+
+ /// \brief Returns the User that contains this Use.
+ ///
+ /// For an instruction operand, for example, this will return the
+ /// instruction.
+ User *getUser() const LLVM_READONLY;
+
+ inline void set(Value *Val);
+
+ inline Value *operator=(Value *RHS);
+ inline const Use &operator=(const Use &RHS);
+
+ Value *operator->() { return Val; }
+ const Value *operator->() const { return Val; }
+
+ Use *getNext() const { return Next; }
+
+ /// \brief Return the operand # of this use in its User.
+ unsigned getOperandNo() const;
+
+ /// \brief Initializes the waymarking tags on an array of Uses.
+ ///
+ /// This sets up the array of Uses such that getUser() can find the User from
+ /// any of those Uses.
+ static Use *initTags(Use *Start, Use *Stop);
+
+ /// \brief Destroys Use operands when the number of operands of
+ /// a User changes.
+ static void zap(Use *Start, const Use *Stop, bool del = false);
+
+private:
+ const Use *getImpliedUser() const LLVM_READONLY;
+
+ Value *Val = nullptr;
+ Use *Next;
+ PointerIntPair<Use **, 2, PrevPtrTag, PrevPointerTraits> Prev;
+
+ void setPrev(Use **NewPrev) { Prev.setPointer(NewPrev); }
+
+ void addToList(Use **List) {
+ Next = *List;
+ if (Next)
+ Next->setPrev(&Next);
+ setPrev(List);
+ *List = this;
+ }
+
+ void removeFromList() {
+ Use **StrippedPrev = Prev.getPointer();
+ *StrippedPrev = Next;
+ if (Next)
+ Next->setPrev(StrippedPrev);
+ }
+};
+
+/// \brief Allow clients to treat uses just like values when using
+/// casting operators.
+template <> struct simplify_type<Use> {
+ using SimpleType = Value *;
+
+ static SimpleType getSimplifiedValue(Use &Val) { return Val.get(); }
+};
+template <> struct simplify_type<const Use> {
+ using SimpleType = /*const*/ Value *;
+
+ static SimpleType getSimplifiedValue(const Use &Val) { return Val.get(); }
+};
+
+// Create wrappers for C Binding types (see CBindingWrapping.h).
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(Use, LLVMUseRef)
+
+} // end namespace llvm
+
+#endif // LLVM_IR_USE_H