--- /dev/null
+//===-- tsan_ilist.h --------------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer (TSan), a race detector.
+//
+//===----------------------------------------------------------------------===//
+#ifndef TSAN_ILIST_H
+#define TSAN_ILIST_H
+
+#include "sanitizer_common/sanitizer_internal_defs.h"
+
+namespace __tsan {
+
+class INode {
+ public:
+ INode() = default;
+
+ private:
+ INode* next_ = nullptr;
+ INode* prev_ = nullptr;
+
+ template <typename Base, INode Base::*Node, typename Elem>
+ friend class IList;
+ INode(const INode&) = delete;
+ void operator=(const INode&) = delete;
+};
+
+// Intrusive doubly-linked list.
+//
+// The node class (MyNode) needs to include "INode foo" field,
+// then the list can be declared as IList<MyNode, &MyNode::foo>.
+// This design allows to link MyNode into multiple lists using
+// different INode fields.
+// The optional Elem template argument allows to specify node MDT
+// (most derived type) if it's different from MyNode.
+template <typename Base, INode Base::*Node, typename Elem = Base>
+class IList {
+ public:
+ IList();
+
+ void PushFront(Elem* e);
+ void PushBack(Elem* e);
+ void Remove(Elem* e);
+
+ Elem* PopFront();
+ Elem* PopBack();
+ Elem* Front();
+ Elem* Back();
+
+ // Prev links point towards front of the queue.
+ Elem* Prev(Elem* e);
+ // Next links point towards back of the queue.
+ Elem* Next(Elem* e);
+
+ uptr Size() const;
+ bool Empty() const;
+ bool Queued(Elem* e) const;
+
+ private:
+ INode node_;
+ uptr size_ = 0;
+
+ void Push(Elem* e, INode* after);
+ static INode* ToNode(Elem* e);
+ static Elem* ToElem(INode* n);
+
+ IList(const IList&) = delete;
+ void operator=(const IList&) = delete;
+};
+
+template <typename Base, INode Base::*Node, typename Elem>
+IList<Base, Node, Elem>::IList() {
+ node_.next_ = node_.prev_ = &node_;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+void IList<Base, Node, Elem>::PushFront(Elem* e) {
+ Push(e, &node_);
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+void IList<Base, Node, Elem>::PushBack(Elem* e) {
+ Push(e, node_.prev_);
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+void IList<Base, Node, Elem>::Push(Elem* e, INode* after) {
+ INode* n = ToNode(e);
+ DCHECK_EQ(n->next_, nullptr);
+ DCHECK_EQ(n->prev_, nullptr);
+ INode* next = after->next_;
+ n->next_ = next;
+ n->prev_ = after;
+ next->prev_ = n;
+ after->next_ = n;
+ size_++;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+void IList<Base, Node, Elem>::Remove(Elem* e) {
+ INode* n = ToNode(e);
+ INode* next = n->next_;
+ INode* prev = n->prev_;
+ DCHECK(next);
+ DCHECK(prev);
+ DCHECK(size_);
+ next->prev_ = prev;
+ prev->next_ = next;
+ n->prev_ = n->next_ = nullptr;
+ size_--;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+Elem* IList<Base, Node, Elem>::PopFront() {
+ Elem* e = Front();
+ if (e)
+ Remove(e);
+ return e;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+Elem* IList<Base, Node, Elem>::PopBack() {
+ Elem* e = Back();
+ if (e)
+ Remove(e);
+ return e;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+Elem* IList<Base, Node, Elem>::Front() {
+ return size_ ? ToElem(node_.next_) : nullptr;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+Elem* IList<Base, Node, Elem>::Back() {
+ return size_ ? ToElem(node_.prev_) : nullptr;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+Elem* IList<Base, Node, Elem>::Prev(Elem* e) {
+ INode* n = ToNode(e);
+ DCHECK(n->prev_);
+ return n->prev_ != &node_ ? ToElem(n->prev_) : nullptr;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+Elem* IList<Base, Node, Elem>::Next(Elem* e) {
+ INode* n = ToNode(e);
+ DCHECK(n->next_);
+ return n->next_ != &node_ ? ToElem(n->next_) : nullptr;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+uptr IList<Base, Node, Elem>::Size() const {
+ return size_;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+bool IList<Base, Node, Elem>::Empty() const {
+ return size_ == 0;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+bool IList<Base, Node, Elem>::Queued(Elem* e) const {
+ INode* n = ToNode(e);
+ DCHECK_EQ(!n->next_, !n->prev_);
+ return n->next_;
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+INode* IList<Base, Node, Elem>::ToNode(Elem* e) {
+ return &(e->*Node);
+}
+
+template <typename Base, INode Base::*Node, typename Elem>
+Elem* IList<Base, Node, Elem>::ToElem(INode* n) {
+ return static_cast<Elem*>(reinterpret_cast<Base*>(
+ reinterpret_cast<uptr>(n) -
+ reinterpret_cast<uptr>(&(reinterpret_cast<Elem*>(0)->*Node))));
+}
+
+} // namespace __tsan
+
+#endif
--- /dev/null
+//===-- tsan_ilist_test.cpp -----------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer (TSan), a race detector.
+//
+//===----------------------------------------------------------------------===//
+#include "tsan_ilist.h"
+
+#include "gtest/gtest.h"
+
+namespace __tsan {
+
+struct Node {
+ INode node1;
+ INode node2;
+};
+
+struct Parent : Node {};
+
+TEST(IList, Empty) {
+ IList<Node, &Node::node1> list;
+ Node node;
+
+ EXPECT_TRUE(list.Empty());
+ EXPECT_EQ(list.Size(), 0);
+ EXPECT_EQ(list.Back(), nullptr);
+ EXPECT_EQ(list.Front(), nullptr);
+ EXPECT_EQ(list.PopBack(), nullptr);
+ EXPECT_EQ(list.PopFront(), nullptr);
+ EXPECT_FALSE(list.Queued(&node));
+}
+
+TEST(IList, OneNode) {
+ IList<Node, &Node::node1> list;
+ Node node;
+
+ list.PushBack(&node);
+ EXPECT_FALSE(list.Empty());
+ EXPECT_EQ(list.Size(), 1);
+ EXPECT_EQ(list.Back(), &node);
+ EXPECT_EQ(list.Front(), &node);
+ EXPECT_TRUE(list.Queued(&node));
+ EXPECT_EQ(list.Prev(&node), nullptr);
+ EXPECT_EQ(list.Next(&node), nullptr);
+
+ EXPECT_EQ(list.PopFront(), &node);
+ EXPECT_TRUE(list.Empty());
+ EXPECT_EQ(list.Size(), 0);
+ EXPECT_FALSE(list.Queued(&node));
+}
+
+TEST(IList, MultipleNodes) {
+ IList<Node, &Node::node1> list;
+ Node nodes[3];
+
+ list.PushBack(&nodes[1]);
+ list.PushBack(&nodes[0]);
+ list.PushFront(&nodes[2]);
+
+ EXPECT_EQ(list.Size(), 3);
+ EXPECT_EQ(list.Back(), &nodes[0]);
+ EXPECT_EQ(list.Front(), &nodes[2]);
+
+ EXPECT_EQ(list.Next(&nodes[0]), nullptr);
+ EXPECT_EQ(list.Prev(&nodes[0]), &nodes[1]);
+
+ EXPECT_EQ(list.Next(&nodes[1]), &nodes[0]);
+ EXPECT_EQ(list.Prev(&nodes[1]), &nodes[2]);
+
+ EXPECT_EQ(list.Next(&nodes[2]), &nodes[1]);
+ EXPECT_EQ(list.Prev(&nodes[2]), nullptr);
+
+ EXPECT_EQ(list.PopBack(), &nodes[0]);
+ EXPECT_EQ(list.PopFront(), &nodes[2]);
+ EXPECT_EQ(list.PopFront(), &nodes[1]);
+ EXPECT_TRUE(list.Empty());
+}
+
+TEST(IList, TwoLists) {
+ IList<Node, &Node::node1> list1;
+ IList<Node, &Node::node2, Parent> list2;
+ Parent nodes[3];
+
+ list1.PushBack(&nodes[2]);
+ list1.PushBack(&nodes[1]);
+ list1.PushBack(&nodes[0]);
+
+ list2.PushFront(&nodes[1]);
+
+ EXPECT_EQ(list1.Size(), 3);
+ EXPECT_TRUE(list1.Queued(&nodes[0]));
+ EXPECT_TRUE(list1.Queued(&nodes[1]));
+ EXPECT_TRUE(list1.Queued(&nodes[2]));
+
+ EXPECT_EQ(list2.Size(), 1);
+ EXPECT_FALSE(list2.Queued(&nodes[0]));
+ EXPECT_TRUE(list2.Queued(&nodes[1]));
+ EXPECT_FALSE(list2.Queued(&nodes[2]));
+
+ EXPECT_EQ(list1.Next(&nodes[1]), &nodes[0]);
+ EXPECT_EQ(list1.Prev(&nodes[1]), &nodes[2]);
+
+ EXPECT_EQ(list2.Next(&nodes[1]), nullptr);
+ EXPECT_EQ(list2.Prev(&nodes[1]), nullptr);
+
+ list1.Remove(&nodes[1]);
+ EXPECT_EQ(list1.Size(), 2);
+ EXPECT_FALSE(list1.Queued(&nodes[1]));
+ EXPECT_EQ(list2.Size(), 1);
+ EXPECT_TRUE(list2.Queued(&nodes[1]));
+
+ EXPECT_EQ(list1.PopBack(), &nodes[0]);
+ EXPECT_EQ(list1.PopBack(), &nodes[2]);
+ EXPECT_EQ(list1.Size(), 0);
+
+ EXPECT_EQ(list2.PopBack(), &nodes[1]);
+ EXPECT_EQ(list2.Size(), 0);
+}
+
+} // namespace __tsan