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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/IR/Use.h" 10 #include "llvm/IR/User.h" 11 #include "llvm/IR/Value.h" 12 #include <new> 13 14 namespace llvm { 15 16 void Use::swap(Use &RHS) { 17 if (Val == RHS.Val) 18 return; 19 20 std::swap(Val, RHS.Val); 21 std::swap(Next, RHS.Next); 22 std::swap(Prev, RHS.Prev); 23 24 *Prev = this; 25 if (Next) 26 Next->Prev = &Next; 27 28 *RHS.Prev = &RHS; 29 if (RHS.Next) 30 RHS.Next->Prev = &RHS.Next; 31 } 32 33 unsigned Use::getOperandNo() const { 34 return this - getUser()->op_begin(); 35 } 36 37 void Use::zap(Use *Start, const Use *Stop, bool del) { 38 while (Start != Stop) 39 (--Stop)->~Use(); 40 if (del) 41 ::operator delete(Start); 42 } 43 44 } // namespace llvm 45