list.hh

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 * Copyright 2018 Google, Inc.
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#ifndef __SYSTEMC_CORE_LIST_HH__
#define __SYSTEMC_CORE_LIST_HH__
 
#include <functional>
 
#include "base/fiber.hh"
#include "systemc/core/object.hh"
#include "systemc/ext/core/sc_event.hh"
#include "systemc/ext/core/sc_module.hh"
#include "systemc/ext/core/sc_process_handle.hh"
 
namespace sc_gem5
{
 
struct ListNode
{
    ListNode() : nextListNode(nullptr), prevListNode(nullptr) {}
    virtual ~ListNode() {}
 
    ListNode *nextListNode;
    ListNode *prevListNode;
 
    void
    popListNode()
    {
        if (nextListNode)
            nextListNode->prevListNode = prevListNode;
        if (prevListNode)
            prevListNode->nextListNode = nextListNode;
        nextListNode = nullptr;
        prevListNode = nullptr;
    }
};
 
template <typename T>
struct NodeList : public ListNode
{
    NodeList()
    {
        nextListNode = this;
        prevListNode = this;
    }
 
    void
    pushFirst(T *t)
    {
        // Make sure this node isn't currently in a different list.
        t->popListNode();
 
        // The node behind t is whoever used to be first.
        t->nextListNode = nextListNode;
        // The node that used to be first is behind t.
        nextListNode->prevListNode = t;
 
        // Nobody is in front of t.
        t->prevListNode = this;
        // The first node is t.
        nextListNode = t;
    }
 
    void
    pushLast(T *t)
    {
        // Make sure this node isn't currently in a different list.
        t->popListNode();
 
        // The node in front of t is whoever used to be last.
        t->prevListNode = prevListNode;
        // The node that used to be last is in front of t.
        prevListNode->nextListNode = t;
 
        // Nobody is behind t.
        t->nextListNode = this;
        // The last node is t.
        prevListNode = t;
    }
 
    T *
    getNext()
    {
        return empty() ? nullptr : static_cast<T *>(nextListNode);
    }
 
    bool empty() { return nextListNode == this; }
};
 
} // namespace sc_gem5
 
#endif  //__SYSTEMC_CORE_LIST_HH__