53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
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//===- llvm/ADT/ilist_node_base.h - Intrusive List Node Base -----*- C++ -*-==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_ILIST_NODE_BASE_H
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#define LLVM_ADT_ILIST_NODE_BASE_H
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#include "llvm/ADT/PointerIntPair.h"
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namespace llvm {
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/// Base class for ilist nodes.
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///
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/// Optionally tracks whether this node is the sentinel.
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template <bool EnableSentinelTracking> class ilist_node_base;
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template <> class ilist_node_base<false> {
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ilist_node_base *Prev = nullptr;
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ilist_node_base *Next = nullptr;
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public:
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void setPrev(ilist_node_base *Prev) { this->Prev = Prev; }
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void setNext(ilist_node_base *Next) { this->Next = Next; }
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ilist_node_base *getPrev() const { return Prev; }
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ilist_node_base *getNext() const { return Next; }
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bool isKnownSentinel() const { return false; }
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void initializeSentinel() {}
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};
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template <> class ilist_node_base<true> {
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PointerIntPair<ilist_node_base *, 1> PrevAndSentinel;
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ilist_node_base *Next = nullptr;
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public:
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void setPrev(ilist_node_base *Prev) { PrevAndSentinel.setPointer(Prev); }
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void setNext(ilist_node_base *Next) { this->Next = Next; }
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ilist_node_base *getPrev() const { return PrevAndSentinel.getPointer(); }
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ilist_node_base *getNext() const { return Next; }
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bool isSentinel() const { return PrevAndSentinel.getInt(); }
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bool isKnownSentinel() const { return isSentinel(); }
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void initializeSentinel() { PrevAndSentinel.setInt(true); }
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};
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} // end namespace llvm
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#endif // LLVM_ADT_ILIST_NODE_BASE_H
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