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426 lines
13 KiB
C++
426 lines
13 KiB
C++
//===-------------------- Graph.h - PBQP Graph ------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// PBQP Graph class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_PBQP_GRAPH_H
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#define LLVM_CODEGEN_PBQP_GRAPH_H
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#include "Math.h"
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#include <list>
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#include <vector>
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#include <map>
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namespace PBQP {
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/// PBQP Graph class.
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/// Instances of this class describe PBQP problems.
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class Graph {
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private:
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// ----- TYPEDEFS -----
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class NodeEntry;
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class EdgeEntry;
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typedef std::list<NodeEntry> NodeList;
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typedef std::list<EdgeEntry> EdgeList;
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public:
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typedef NodeList::iterator NodeItr;
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typedef NodeList::const_iterator ConstNodeItr;
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typedef EdgeList::iterator EdgeItr;
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typedef EdgeList::const_iterator ConstEdgeItr;
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private:
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typedef std::list<EdgeItr> AdjEdgeList;
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public:
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typedef AdjEdgeList::iterator AdjEdgeItr;
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private:
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class NodeEntry {
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private:
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Vector costs;
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AdjEdgeList adjEdges;
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unsigned degree;
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void *data;
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public:
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NodeEntry(const Vector &costs) : costs(costs), degree(0) {}
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Vector& getCosts() { return costs; }
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const Vector& getCosts() const { return costs; }
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unsigned getDegree() const { return degree; }
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AdjEdgeItr edgesBegin() { return adjEdges.begin(); }
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AdjEdgeItr edgesEnd() { return adjEdges.end(); }
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AdjEdgeItr addEdge(EdgeItr e) {
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++degree;
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return adjEdges.insert(adjEdges.end(), e);
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}
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void removeEdge(AdjEdgeItr ae) {
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--degree;
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adjEdges.erase(ae);
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}
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void setData(void *data) { this->data = data; }
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void* getData() { return data; }
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};
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class EdgeEntry {
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private:
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NodeItr node1, node2;
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Matrix costs;
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AdjEdgeItr node1AEItr, node2AEItr;
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void *data;
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public:
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EdgeEntry(NodeItr node1, NodeItr node2, const Matrix &costs)
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: node1(node1), node2(node2), costs(costs) {}
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NodeItr getNode1() const { return node1; }
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NodeItr getNode2() const { return node2; }
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Matrix& getCosts() { return costs; }
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const Matrix& getCosts() const { return costs; }
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void setNode1AEItr(AdjEdgeItr ae) { node1AEItr = ae; }
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AdjEdgeItr getNode1AEItr() { return node1AEItr; }
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void setNode2AEItr(AdjEdgeItr ae) { node2AEItr = ae; }
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AdjEdgeItr getNode2AEItr() { return node2AEItr; }
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void setData(void *data) { this->data = data; }
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void *getData() { return data; }
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};
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// ----- MEMBERS -----
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NodeList nodes;
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unsigned numNodes;
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EdgeList edges;
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unsigned numEdges;
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// ----- INTERNAL METHODS -----
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NodeEntry& getNode(NodeItr nItr) { return *nItr; }
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const NodeEntry& getNode(ConstNodeItr nItr) const { return *nItr; }
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EdgeEntry& getEdge(EdgeItr eItr) { return *eItr; }
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const EdgeEntry& getEdge(ConstEdgeItr eItr) const { return *eItr; }
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NodeItr addConstructedNode(const NodeEntry &n) {
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++numNodes;
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return nodes.insert(nodes.end(), n);
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}
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EdgeItr addConstructedEdge(const EdgeEntry &e) {
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assert(findEdge(e.getNode1(), e.getNode2()) == edges.end() &&
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"Attempt to add duplicate edge.");
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++numEdges;
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EdgeItr edgeItr = edges.insert(edges.end(), e);
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EdgeEntry &ne = getEdge(edgeItr);
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NodeEntry &n1 = getNode(ne.getNode1());
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NodeEntry &n2 = getNode(ne.getNode2());
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// Sanity check on matrix dimensions:
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assert((n1.getCosts().getLength() == ne.getCosts().getRows()) &&
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(n2.getCosts().getLength() == ne.getCosts().getCols()) &&
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"Edge cost dimensions do not match node costs dimensions.");
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ne.setNode1AEItr(n1.addEdge(edgeItr));
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ne.setNode2AEItr(n2.addEdge(edgeItr));
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return edgeItr;
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}
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inline void copyFrom(const Graph &other);
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public:
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/// \brief Construct an empty PBQP graph.
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Graph() : numNodes(0), numEdges(0) {}
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/// \brief Copy construct this graph from "other". Note: Does not copy node
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/// and edge data, only graph structure and costs.
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/// @param other Source graph to copy from.
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Graph(const Graph &other) : numNodes(0), numEdges(0) {
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copyFrom(other);
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}
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/// \brief Make this graph a copy of "other". Note: Does not copy node and
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/// edge data, only graph structure and costs.
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/// @param other The graph to copy from.
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/// @return A reference to this graph.
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///
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/// This will clear the current graph, erasing any nodes and edges added,
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/// before copying from other.
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Graph& operator=(const Graph &other) {
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clear();
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copyFrom(other);
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return *this;
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}
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/// \brief Add a node with the given costs.
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/// @param costs Cost vector for the new node.
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/// @return Node iterator for the added node.
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NodeItr addNode(const Vector &costs) {
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return addConstructedNode(NodeEntry(costs));
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}
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/// \brief Add an edge between the given nodes with the given costs.
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/// @param n1Itr First node.
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/// @param n2Itr Second node.
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/// @return Edge iterator for the added edge.
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EdgeItr addEdge(Graph::NodeItr n1Itr, Graph::NodeItr n2Itr,
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const Matrix &costs) {
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assert(getNodeCosts(n1Itr).getLength() == costs.getRows() &&
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getNodeCosts(n2Itr).getLength() == costs.getCols() &&
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"Matrix dimensions mismatch.");
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return addConstructedEdge(EdgeEntry(n1Itr, n2Itr, costs));
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}
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/// \brief Get the number of nodes in the graph.
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/// @return Number of nodes in the graph.
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unsigned getNumNodes() const { return numNodes; }
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/// \brief Get the number of edges in the graph.
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/// @return Number of edges in the graph.
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unsigned getNumEdges() const { return numEdges; }
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/// \brief Get a node's cost vector.
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/// @param nItr Node iterator.
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/// @return Node cost vector.
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Vector& getNodeCosts(NodeItr nItr) { return getNode(nItr).getCosts(); }
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/// \brief Get a node's cost vector (const version).
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/// @param nItr Node iterator.
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/// @return Node cost vector.
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const Vector& getNodeCosts(ConstNodeItr nItr) const {
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return getNode(nItr).getCosts();
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}
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/// \brief Set a node's data pointer.
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/// @param nItr Node iterator.
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/// @param data Pointer to node data.
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///
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/// Typically used by a PBQP solver to attach data to aid in solution.
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void setNodeData(NodeItr nItr, void *data) { getNode(nItr).setData(data); }
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/// \brief Get the node's data pointer.
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/// @param nItr Node iterator.
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/// @return Pointer to node data.
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void* getNodeData(NodeItr nItr) { return getNode(nItr).getData(); }
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/// \brief Get an edge's cost matrix.
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/// @param eItr Edge iterator.
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/// @return Edge cost matrix.
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Matrix& getEdgeCosts(EdgeItr eItr) { return getEdge(eItr).getCosts(); }
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/// \brief Get an edge's cost matrix (const version).
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/// @param eItr Edge iterator.
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/// @return Edge cost matrix.
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const Matrix& getEdgeCosts(ConstEdgeItr eItr) const {
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return getEdge(eItr).getCosts();
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}
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/// \brief Set an edge's data pointer.
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/// @param eItr Edge iterator.
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/// @param data Pointer to edge data.
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///
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/// Typically used by a PBQP solver to attach data to aid in solution.
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void setEdgeData(EdgeItr eItr, void *data) { getEdge(eItr).setData(data); }
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/// \brief Get an edge's data pointer.
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/// @param eItr Edge iterator.
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/// @return Pointer to edge data.
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void* getEdgeData(EdgeItr eItr) { return getEdge(eItr).getData(); }
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/// \brief Get a node's degree.
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/// @param nItr Node iterator.
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/// @return The degree of the node.
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unsigned getNodeDegree(NodeItr nItr) const {
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return getNode(nItr).getDegree();
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}
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/// \brief Begin iterator for node set.
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NodeItr nodesBegin() { return nodes.begin(); }
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/// \brief Begin const iterator for node set.
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ConstNodeItr nodesBegin() const { return nodes.begin(); }
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/// \brief End iterator for node set.
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NodeItr nodesEnd() { return nodes.end(); }
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/// \brief End const iterator for node set.
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ConstNodeItr nodesEnd() const { return nodes.end(); }
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/// \brief Begin iterator for edge set.
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EdgeItr edgesBegin() { return edges.begin(); }
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/// \brief End iterator for edge set.
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EdgeItr edgesEnd() { return edges.end(); }
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/// \brief Get begin iterator for adjacent edge set.
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/// @param nItr Node iterator.
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/// @return Begin iterator for the set of edges connected to the given node.
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AdjEdgeItr adjEdgesBegin(NodeItr nItr) {
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return getNode(nItr).edgesBegin();
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}
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/// \brief Get end iterator for adjacent edge set.
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/// @param nItr Node iterator.
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/// @return End iterator for the set of edges connected to the given node.
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AdjEdgeItr adjEdgesEnd(NodeItr nItr) {
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return getNode(nItr).edgesEnd();
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}
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/// \brief Get the first node connected to this edge.
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/// @param eItr Edge iterator.
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/// @return The first node connected to the given edge.
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NodeItr getEdgeNode1(EdgeItr eItr) {
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return getEdge(eItr).getNode1();
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}
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/// \brief Get the second node connected to this edge.
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/// @param eItr Edge iterator.
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/// @return The second node connected to the given edge.
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NodeItr getEdgeNode2(EdgeItr eItr) {
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return getEdge(eItr).getNode2();
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}
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/// \brief Get the "other" node connected to this edge.
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/// @param eItr Edge iterator.
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/// @param nItr Node iterator for the "given" node.
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/// @return The iterator for the "other" node connected to this edge.
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NodeItr getEdgeOtherNode(EdgeItr eItr, NodeItr nItr) {
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EdgeEntry &e = getEdge(eItr);
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if (e.getNode1() == nItr) {
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return e.getNode2();
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} // else
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return e.getNode1();
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}
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/// \brief Get the edge connecting two nodes.
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/// @param n1Itr First node iterator.
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/// @param n2Itr Second node iterator.
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/// @return An iterator for edge (n1Itr, n2Itr) if such an edge exists,
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/// otherwise returns edgesEnd().
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EdgeItr findEdge(NodeItr n1Itr, NodeItr n2Itr) {
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for (AdjEdgeItr aeItr = adjEdgesBegin(n1Itr), aeEnd = adjEdgesEnd(n1Itr);
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aeItr != aeEnd; ++aeItr) {
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if ((getEdgeNode1(*aeItr) == n2Itr) ||
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(getEdgeNode2(*aeItr) == n2Itr)) {
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return *aeItr;
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}
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}
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return edges.end();
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}
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/// \brief Remove a node from the graph.
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/// @param nItr Node iterator.
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void removeNode(NodeItr nItr) {
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NodeEntry &n = getNode(nItr);
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for (AdjEdgeItr itr = n.edgesBegin(), end = n.edgesEnd(); itr != end;) {
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EdgeItr eItr = *itr;
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++itr;
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removeEdge(eItr);
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}
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nodes.erase(nItr);
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--numNodes;
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}
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/// \brief Remove an edge from the graph.
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/// @param eItr Edge iterator.
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void removeEdge(EdgeItr eItr) {
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EdgeEntry &e = getEdge(eItr);
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NodeEntry &n1 = getNode(e.getNode1());
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NodeEntry &n2 = getNode(e.getNode2());
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n1.removeEdge(e.getNode1AEItr());
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n2.removeEdge(e.getNode2AEItr());
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edges.erase(eItr);
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--numEdges;
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}
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/// \brief Remove all nodes and edges from the graph.
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void clear() {
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nodes.clear();
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edges.clear();
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numNodes = numEdges = 0;
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}
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/// \brief Print a representation of this graph in DOT format.
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/// @param os Output stream to print on.
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template <typename OStream>
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void printDot(OStream &os) {
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os << "graph {\n";
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for (NodeItr nodeItr = nodesBegin(), nodeEnd = nodesEnd();
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nodeItr != nodeEnd; ++nodeItr) {
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os << " node" << nodeItr << " [ label=\""
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<< nodeItr << ": " << getNodeCosts(nodeItr) << "\" ]\n";
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}
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os << " edge [ len=" << getNumNodes() << " ]\n";
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for (EdgeItr edgeItr = edgesBegin(), edgeEnd = edgesEnd();
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edgeItr != edgeEnd; ++edgeItr) {
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os << " node" << getEdgeNode1(edgeItr)
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<< " -- node" << getEdgeNode2(edgeItr)
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<< " [ label=\"";
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const Matrix &edgeCosts = getEdgeCosts(edgeItr);
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for (unsigned i = 0; i < edgeCosts.getRows(); ++i) {
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os << edgeCosts.getRowAsVector(i) << "\\n";
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}
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os << "\" ]\n";
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}
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os << "}\n";
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}
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};
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class NodeItrComparator {
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public:
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bool operator()(Graph::NodeItr n1, Graph::NodeItr n2) const {
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return &*n1 < &*n2;
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}
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bool operator()(Graph::ConstNodeItr n1, Graph::ConstNodeItr n2) const {
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return &*n1 < &*n2;
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}
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};
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class EdgeItrCompartor {
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public:
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bool operator()(Graph::EdgeItr e1, Graph::EdgeItr e2) const {
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return &*e1 < &*e2;
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}
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bool operator()(Graph::ConstEdgeItr e1, Graph::ConstEdgeItr e2) const {
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return &*e1 < &*e2;
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}
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};
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void Graph::copyFrom(const Graph &other) {
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std::map<Graph::ConstNodeItr, Graph::NodeItr,
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NodeItrComparator> nodeMap;
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for (Graph::ConstNodeItr nItr = other.nodesBegin(),
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nEnd = other.nodesEnd();
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nItr != nEnd; ++nItr) {
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nodeMap[nItr] = addNode(other.getNodeCosts(nItr));
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}
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}
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}
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#endif // LLVM_CODEGEN_PBQP_GRAPH_HPP
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