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