45 lines · cpp
1//===-- Use.cpp - Implement the Use class ---------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "llvm/IR/Use.h"10#include "llvm/IR/User.h"11 12using namespace llvm;13 14void Use::swap(Use &RHS) {15 if (Val == RHS.Val)16 return;17 18 std::swap(Val, RHS.Val);19 std::swap(Next, RHS.Next);20 std::swap(Prev, RHS.Prev);21 22 if (Prev)23 *Prev = this;24 25 if (Next)26 Next->Prev = &Next;27 28 if (RHS.Prev)29 *RHS.Prev = &RHS;30 31 if (RHS.Next)32 RHS.Next->Prev = &RHS.Next;33}34 35unsigned Use::getOperandNo() const {36 return this - getUser()->op_begin();37}38 39void Use::zap(Use *Start, const Use *Stop, bool del) {40 while (Start != Stop)41 (--Stop)->~Use();42 if (del)43 ::operator delete(Start);44}45