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 #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