xref: /gem5/ext/dsent/model/timing_graph/ElectricalTimingTree.h

/* Copyright (c) 2012 Massachusetts Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#ifndef __DSENT_MODEL_ELECTRICAL_TIMING_TREE_H__
#define __DSENT_MODEL_ELECTRICAL_TIMING_TREE_H__

#include <vector>

#include "util/CommonType.h"
#include "model/timing_graph/ElectricalTimingNode.h"

namespace DSENT
{
    using std::vector;

    class ElectricalDriver;

    class ElectricalTimingTree
    {
        public:
            // The visited number for the next timing run. This needs to be
            // global because several timing trees may be created to evaluate
            // a single timing path, causing problems
            static int msTreeNum;

        public:
            // Construct timing tree that watches over model_
            ElectricalTimingTree(const String& instance_name_, ElectricalModel* model_);
            ~ElectricalTimingTree();

        public:
            // Get tree name
            const String& getInstanceName() const;

            // A wrapper for extractCritPathDelay
            // Update the tree num before do extract critical path delay recursively
            double performCritPathExtract(ElectricalTimingNode* node_);
            // Calculate the delay of the marked critical path from a starting node
            double calculateCritPathDelay(ElectricalTimingNode* node_) const;
            // Calculate the transition at a node
            double calculateNodeTransition(ElectricalTimingNode* node_) const;
            // Returns the optimal node to optimize timing (by sizing up) in the critical
            // path to reduce critical path delay
            ElectricalTimingNode* findNodeForTimingOpt(ElectricalTimingNode* node_) const;
            // Perform incremental timing optimization to guarantee that all timing paths from a
            // starting node meets a required delay
            // Return false if the timing optimization fails to meet the required delay
            bool performTimingOpt(ElectricalTimingNode* node_, double required_delay_);

            // Return the model
            ElectricalModel* getModel();

        private:
            // Disable the use of copy constructor
            ElectricalTimingTree(const ElectricalTimingTree& graph_);

            // Recursively calculate delay from a starting node, finding and marking the
            // critical path along the way and returns the delay of the critical path
            double extractCritPathDelay(ElectricalTimingNode* node_);

        public:
            // Set the sequence number of the timing tree
            static void setTreeNum(int tree_num_);
            static int getTreeNum();

        private:
            // Name of the timing tree
            const String m_instance_name_;
            // A pointer to the model that contains this node
            ElectricalModel* m_model_;

    }; // class ElectricalTimingTree
} // namespace DSENT

#endif // __DSENT_MODEL_ELECTRICAL_TIMING_TREE_H__