| //===-- Use.cpp - Implement the Use class ---------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/IR/Use.h" |
| #include "llvm/IR/User.h" |
| #include "llvm/IR/Value.h" |
| #include <new> |
| |
| namespace llvm { |
| |
| void Use::swap(Use &RHS) { |
| if (Val == RHS.Val) |
| return; |
| |
| if (Val) |
| removeFromList(); |
| |
| Value *OldVal = Val; |
| if (RHS.Val) { |
| RHS.removeFromList(); |
| Val = RHS.Val; |
| Val->addUse(*this); |
| } else { |
| Val = nullptr; |
| } |
| |
| if (OldVal) { |
| RHS.Val = OldVal; |
| RHS.Val->addUse(RHS); |
| } else { |
| RHS.Val = nullptr; |
| } |
| } |
| |
| unsigned Use::getOperandNo() const { |
| return this - getUser()->op_begin(); |
| } |
| |
| void Use::zap(Use *Start, const Use *Stop, bool del) { |
| while (Start != Stop) |
| (--Stop)->~Use(); |
| if (del) |
| ::operator delete(Start); |
| } |
| |
| } // namespace llvm |