llvm-6502/lib/CodeGen/PBQP/GraphBase.h
2010-01-06 08:53:34 +00:00

583 lines
17 KiB
C++

//===-- GraphBase.h - Abstract Base PBQP Graph ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Base class for PBQP Graphs.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_PBQP_GRAPHBASE_H
#define LLVM_CODEGEN_PBQP_GRAPHBASE_H
#include "PBQPMath.h"
#include <list>
#include <vector>
namespace PBQP {
// UGLY, but I'm not sure there's a good way around this: We need to be able to
// look up a Node's "adjacent edge list" structure type before the Node type is
// fully constructed. We can enable this by pushing the choice of data type
// out into this traits class.
template <typename Graph>
class NodeBaseTraits {
public:
typedef std::list<typename Graph::EdgeIterator> AdjEdgeList;
typedef typename AdjEdgeList::iterator AdjEdgeIterator;
typedef typename AdjEdgeList::const_iterator ConstAdjEdgeIterator;
};
/// \brief Base for concrete graph classes. Provides a basic set of graph
/// operations which are useful for PBQP solvers.
template <typename NodeEntry, typename EdgeEntry>
class GraphBase {
private:
typedef GraphBase<NodeEntry, EdgeEntry> ThisGraphT;
typedef std::list<NodeEntry> NodeList;
typedef std::list<EdgeEntry> EdgeList;
NodeList nodeList;
unsigned nodeListSize;
EdgeList edgeList;
unsigned edgeListSize;
GraphBase(const ThisGraphT &other) { abort(); }
void operator=(const ThisGraphT &other) { abort(); }
public:
/// \brief Iterates over the nodes of a graph.
typedef typename NodeList::iterator NodeIterator;
/// \brief Iterates over the nodes of a const graph.
typedef typename NodeList::const_iterator ConstNodeIterator;
/// \brief Iterates over the edges of a graph.
typedef typename EdgeList::iterator EdgeIterator;
/// \brief Iterates over the edges of a const graph.
typedef typename EdgeList::const_iterator ConstEdgeIterator;
/// \brief Iterates over the edges attached to a node.
typedef typename NodeBaseTraits<ThisGraphT>::AdjEdgeIterator
AdjEdgeIterator;
/// \brief Iterates over the edges attached to a node in a const graph.
typedef typename NodeBaseTraits<ThisGraphT>::ConstAdjEdgeIterator
ConstAdjEdgeIterator;
private:
typedef std::vector<NodeIterator> IDToNodeMap;
IDToNodeMap idToNodeMap;
bool nodeIDsValid;
void invalidateNodeIDs() {
if (nodeIDsValid) {
idToNodeMap.clear();
nodeIDsValid = false;
}
}
template <typename ItrT>
bool iteratorInRange(ItrT itr, const ItrT &begin, const ItrT &end) {
for (ItrT t = begin; t != end; ++t) {
if (itr == t)
return true;
}
return false;
}
protected:
GraphBase() : nodeListSize(0), edgeListSize(0), nodeIDsValid(false) {}
NodeEntry& getNodeEntry(const NodeIterator &nodeItr) { return *nodeItr; }
const NodeEntry& getNodeEntry(const ConstNodeIterator &nodeItr) const {
return *nodeItr;
}
EdgeEntry& getEdgeEntry(const EdgeIterator &edgeItr) { return *edgeItr; }
const EdgeEntry& getEdgeEntry(const ConstEdgeIterator &edgeItr) const {
return *edgeItr;
}
NodeIterator addConstructedNode(const NodeEntry &nodeEntry) {
++nodeListSize;
invalidateNodeIDs();
NodeIterator newNodeItr = nodeList.insert(nodeList.end(), nodeEntry);
return newNodeItr;
}
EdgeIterator addConstructedEdge(const EdgeEntry &edgeEntry) {
assert((findEdge(edgeEntry.getNode1Itr(), edgeEntry.getNode2Itr())
== edgeList.end()) && "Attempt to add duplicate edge.");
++edgeListSize;
// Add the edge to the graph.
EdgeIterator edgeItr = edgeList.insert(edgeList.end(), edgeEntry);
// Get a reference to the version in the graph.
EdgeEntry &newEdgeEntry = getEdgeEntry(edgeItr);
// Node entries:
NodeEntry &node1Entry = getNodeEntry(newEdgeEntry.getNode1Itr()),
&node2Entry = getNodeEntry(newEdgeEntry.getNode2Itr());
// Sanity check on matrix dimensions.
assert((node1Entry.getCosts().getLength() ==
newEdgeEntry.getCosts().getRows()) &&
(node2Entry.getCosts().getLength() ==
newEdgeEntry.getCosts().getCols()) &&
"Matrix dimensions do not match cost vector dimensions.");
// Create links between nodes and edges.
newEdgeEntry.setNode1ThisEdgeItr(
node1Entry.addAdjEdge(edgeItr));
newEdgeEntry.setNode2ThisEdgeItr(
node2Entry.addAdjEdge(edgeItr));
return edgeItr;
}
public:
/// \brief Returns the number of nodes in this graph.
unsigned getNumNodes() const { return nodeListSize; }
/// \brief Returns the number of edges in this graph.
unsigned getNumEdges() const { return edgeListSize; }
/// \brief Return the cost vector for the given node.
Vector& getNodeCosts(const NodeIterator &nodeItr) {
return getNodeEntry(nodeItr).getCosts();
}
/// \brief Return the cost vector for the give node.
const Vector& getNodeCosts(const ConstNodeIterator &nodeItr) const {
return getNodeEntry(nodeItr).getCosts();
}
/// \brief Return the degree of the given node.
unsigned getNodeDegree(const NodeIterator &nodeItr) const {
return getNodeEntry(nodeItr).getDegree();
}
/// \brief Assigns sequential IDs to the nodes, starting at 0, which
/// remain valid until the next addition or removal of a node.
void assignNodeIDs() {
unsigned curID = 0;
idToNodeMap.resize(getNumNodes());
for (NodeIterator nodeItr = nodesBegin(), nodeEnd = nodesEnd();
nodeItr != nodeEnd; ++nodeItr, ++curID) {
getNodeEntry(nodeItr).setID(curID);
idToNodeMap[curID] = nodeItr;
}
nodeIDsValid = true;
}
/// \brief Assigns sequential IDs to the nodes using the ordering of the
/// given vector.
void assignNodeIDs(const std::vector<NodeIterator> &nodeOrdering) {
assert((getNumNodes() == nodeOrdering.size()) &&
"Wrong number of nodes in node ordering.");
idToNodeMap = nodeOrdering;
for (unsigned nodeID = 0; nodeID < idToNodeMap.size(); ++nodeID) {
getNodeEntry(idToNodeMap[nodeID]).setID(nodeID);
}
nodeIDsValid = true;
}
/// \brief Returns true if valid node IDs are assigned, false otherwise.
bool areNodeIDsValid() const { return nodeIDsValid; }
/// \brief Return the numeric ID of the given node.
///
/// Calls to this method will result in an assertion failure if there have
/// been any node additions or removals since the last call to
/// assignNodeIDs().
unsigned getNodeID(const ConstNodeIterator &nodeItr) const {
assert(nodeIDsValid && "Attempt to retrieve invalid ID.");
return getNodeEntry(nodeItr).getID();
}
/// \brief Returns the iterator associated with the given node ID.
NodeIterator getNodeItr(unsigned nodeID) {
assert(nodeIDsValid && "Attempt to retrieve iterator with invalid ID.");
return idToNodeMap[nodeID];
}
/// \brief Returns the iterator associated with the given node ID.
ConstNodeIterator getNodeItr(unsigned nodeID) const {
assert(nodeIDsValid && "Attempt to retrieve iterator with invalid ID.");
return idToNodeMap[nodeID];
}
/// \brief Removes the given node (and all attached edges) from the graph.
void removeNode(const NodeIterator &nodeItr) {
assert(iteratorInRange(nodeItr, nodeList.begin(), nodeList.end()) &&
"Iterator does not belong to this graph!");
invalidateNodeIDs();
NodeEntry &nodeEntry = getNodeEntry(nodeItr);
// We need to copy this out because it will be destroyed as the edges are
// removed.
typedef std::vector<EdgeIterator> AdjEdgeList;
typedef typename AdjEdgeList::iterator AdjEdgeListItr;
AdjEdgeList adjEdges;
adjEdges.reserve(nodeEntry.getDegree());
std::copy(nodeEntry.adjEdgesBegin(), nodeEntry.adjEdgesEnd(),
std::back_inserter(adjEdges));
// Iterate over the copied out edges and remove them from the graph.
for (AdjEdgeListItr itr = adjEdges.begin(), end = adjEdges.end();
itr != end; ++itr) {
removeEdge(*itr);
}
// Erase the node from the nodelist.
nodeList.erase(nodeItr);
--nodeListSize;
}
NodeIterator nodesBegin() { return nodeList.begin(); }
ConstNodeIterator nodesBegin() const { return nodeList.begin(); }
NodeIterator nodesEnd() { return nodeList.end(); }
ConstNodeIterator nodesEnd() const { return nodeList.end(); }
AdjEdgeIterator adjEdgesBegin(const NodeIterator &nodeItr) {
return getNodeEntry(nodeItr).adjEdgesBegin();
}
ConstAdjEdgeIterator adjEdgesBegin(const ConstNodeIterator &nodeItr) const {
return getNodeEntry(nodeItr).adjEdgesBegin();
}
AdjEdgeIterator adjEdgesEnd(const NodeIterator &nodeItr) {
return getNodeEntry(nodeItr).adjEdgesEnd();
}
ConstAdjEdgeIterator adjEdgesEnd(const ConstNodeIterator &nodeItr) const {
getNodeEntry(nodeItr).adjEdgesEnd();
}
EdgeIterator findEdge(const NodeIterator &node1Itr,
const NodeIterator &node2Itr) {
for (AdjEdgeIterator adjEdgeItr = adjEdgesBegin(node1Itr),
adjEdgeEnd = adjEdgesEnd(node1Itr);
adjEdgeItr != adjEdgeEnd; ++adjEdgeItr) {
if ((getEdgeNode1Itr(*adjEdgeItr) == node2Itr) ||
(getEdgeNode2Itr(*adjEdgeItr) == node2Itr)) {
return *adjEdgeItr;
}
}
return edgeList.end();
}
ConstEdgeIterator findEdge(const ConstNodeIterator &node1Itr,
const ConstNodeIterator &node2Itr) const {
for (ConstAdjEdgeIterator adjEdgeItr = adjEdgesBegin(node1Itr),
adjEdgeEnd = adjEdgesEnd(node1Itr);
adjEdgeItr != adjEdgeEnd; ++adjEdgeItr) {
if ((getEdgeNode1Itr(*adjEdgeItr) == node2Itr) ||
(getEdgeNode2Itr(*adjEdgeItr) == node2Itr)) {
return *adjEdgeItr;
}
}
return edgeList.end();
}
Matrix& getEdgeCosts(const EdgeIterator &edgeItr) {
return getEdgeEntry(edgeItr).getCosts();
}
const Matrix& getEdgeCosts(const ConstEdgeIterator &edgeItr) const {
return getEdgeEntry(edgeItr).getCosts();
}
NodeIterator getEdgeNode1Itr(const EdgeIterator &edgeItr) {
return getEdgeEntry(edgeItr).getNode1Itr();
}
ConstNodeIterator getEdgeNode1Itr(const ConstEdgeIterator &edgeItr) const {
return getEdgeEntry(edgeItr).getNode1Itr();
}
NodeIterator getEdgeNode2Itr(const EdgeIterator &edgeItr) {
return getEdgeEntry(edgeItr).getNode2Itr();
}
ConstNodeIterator getEdgeNode2Itr(const ConstEdgeIterator &edgeItr) const {
return getEdgeEntry(edgeItr).getNode2Itr();
}
NodeIterator getEdgeOtherNode(const EdgeIterator &edgeItr,
const NodeIterator &nodeItr) {
EdgeEntry &edgeEntry = getEdgeEntry(edgeItr);
if (nodeItr == edgeEntry.getNode1Itr()) {
return edgeEntry.getNode2Itr();
}
//else
return edgeEntry.getNode1Itr();
}
ConstNodeIterator getEdgeOtherNode(const ConstEdgeIterator &edgeItr,
const ConstNodeIterator &nodeItr) const {
const EdgeEntry &edgeEntry = getEdgeEntry(edgeItr);
if (nodeItr == edgeEntry.getNode1Itr()) {
return edgeEntry.getNode2Itr();
}
//else
return edgeEntry.getNode1Itr();
}
void removeEdge(const EdgeIterator &edgeItr) {
assert(iteratorInRange(edgeItr, edgeList.begin(), edgeList.end()) &&
"Iterator does not belong to this graph!");
--edgeListSize;
// Get the edge entry.
EdgeEntry &edgeEntry = getEdgeEntry(edgeItr);
// Get the nodes entry.
NodeEntry &node1Entry(getNodeEntry(edgeEntry.getNode1Itr())),
&node2Entry(getNodeEntry(edgeEntry.getNode2Itr()));
// Disconnect the edge from the nodes.
node1Entry.removeAdjEdge(edgeEntry.getNode1ThisEdgeItr());
node2Entry.removeAdjEdge(edgeEntry.getNode2ThisEdgeItr());
// Remove the edge from the graph.
edgeList.erase(edgeItr);
}
EdgeIterator edgesBegin() { return edgeList.begin(); }
ConstEdgeIterator edgesBegin() const { return edgeList.begin(); }
EdgeIterator edgesEnd() { return edgeList.end(); }
ConstEdgeIterator edgesEnd() const { return edgeList.end(); }
void clear() {
nodeList.clear();
nodeListSize = 0;
edgeList.clear();
edgeListSize = 0;
idToNodeMap.clear();
}
template <typename OStream>
void printDot(OStream &os) const {
assert(areNodeIDsValid() &&
"Cannot print a .dot of a graph unless IDs have been assigned.");
os << "graph {\n";
for (ConstNodeIterator nodeItr = nodesBegin(), nodeEnd = nodesEnd();
nodeItr != nodeEnd; ++nodeItr) {
os << " node" << getNodeID(nodeItr) << " [ label=\""
<< getNodeID(nodeItr) << ": " << getNodeCosts(nodeItr) << "\" ]\n";
}
os << " edge [ len=" << getNumNodes() << " ]\n";
for (ConstEdgeIterator edgeItr = edgesBegin(), edgeEnd = edgesEnd();
edgeItr != edgeEnd; ++edgeItr) {
os << " node" << getNodeID(getEdgeNode1Itr(edgeItr))
<< " -- node" << getNodeID(getEdgeNode2Itr(edgeItr))
<< " [ label=\"";
const Matrix &edgeCosts = getEdgeCosts(edgeItr);
for (unsigned i = 0; i < edgeCosts.getRows(); ++i) {
os << edgeCosts.getRowAsVector(i) << "\\n";
}
os << "\" ]\n";
}
os << "}\n";
}
template <typename OStream>
void printDot(OStream &os) {
if (!areNodeIDsValid()) {
assignNodeIDs();
}
const_cast<const ThisGraphT*>(this)->printDot(os);
}
template <typename OStream>
void dumpTo(OStream &os) const {
typedef ConstNodeIterator ConstNodeID;
assert(areNodeIDsValid() &&
"Cannot dump a graph unless IDs have been assigned.");
for (ConstNodeIterator nItr = nodesBegin(), nEnd = nodesEnd();
nItr != nEnd; ++nItr) {
os << getNodeID(nItr) << "\n";
}
unsigned edgeNumber = 1;
for (ConstEdgeIterator eItr = edgesBegin(), eEnd = edgesEnd();
eItr != eEnd; ++eItr) {
os << edgeNumber++ << ": { "
<< getNodeID(getEdgeNode1Itr(eItr)) << ", "
<< getNodeID(getEdgeNode2Itr(eItr)) << " }\n";
}
}
template <typename OStream>
void dumpTo(OStream &os) {
if (!areNodeIDsValid()) {
assignNodeIDs();
}
const_cast<const ThisGraphT*>(this)->dumpTo(os);
}
};
/// \brief Provides a base from which to derive nodes for GraphBase.
template <typename NodeImpl, typename EdgeImpl>
class NodeBase {
private:
typedef GraphBase<NodeImpl, EdgeImpl> GraphBaseT;
typedef NodeBaseTraits<GraphBaseT> ThisNodeBaseTraits;
public:
typedef typename GraphBaseT::EdgeIterator EdgeIterator;
private:
typedef typename ThisNodeBaseTraits::AdjEdgeList AdjEdgeList;
unsigned degree, id;
Vector costs;
AdjEdgeList adjEdges;
void operator=(const NodeBase& other) {
assert(false && "Can't assign NodeEntrys.");
}
public:
typedef typename ThisNodeBaseTraits::AdjEdgeIterator AdjEdgeIterator;
typedef typename ThisNodeBaseTraits::ConstAdjEdgeIterator
ConstAdjEdgeIterator;
NodeBase(const Vector &costs) : degree(0), costs(costs) {
assert((costs.getLength() > 0) && "Can't have zero-length cost vector.");
}
Vector& getCosts() { return costs; }
const Vector& getCosts() const { return costs; }
unsigned getDegree() const { return degree; }
void setID(unsigned id) { this->id = id; }
unsigned getID() const { return id; }
AdjEdgeIterator addAdjEdge(const EdgeIterator &edgeItr) {
++degree;
return adjEdges.insert(adjEdges.end(), edgeItr);
}
void removeAdjEdge(const AdjEdgeIterator &adjEdgeItr) {
--degree;
adjEdges.erase(adjEdgeItr);
}
AdjEdgeIterator adjEdgesBegin() { return adjEdges.begin(); }
ConstAdjEdgeIterator adjEdgesBegin() const { return adjEdges.begin(); }
AdjEdgeIterator adjEdgesEnd() { return adjEdges.end(); }
ConstAdjEdgeIterator adjEdgesEnd() const { return adjEdges.end(); }
};
template <typename NodeImpl, typename EdgeImpl>
class EdgeBase {
public:
typedef typename GraphBase<NodeImpl, EdgeImpl>::NodeIterator NodeIterator;
typedef typename GraphBase<NodeImpl, EdgeImpl>::EdgeIterator EdgeIterator;
typedef typename NodeImpl::AdjEdgeIterator NodeAdjEdgeIterator;
private:
NodeIterator node1Itr, node2Itr;
NodeAdjEdgeIterator node1ThisEdgeItr, node2ThisEdgeItr;
Matrix costs;
void operator=(const EdgeBase &other) {
assert(false && "Can't assign EdgeEntrys.");
}
public:
EdgeBase(const NodeIterator &node1Itr, const NodeIterator &node2Itr,
const Matrix &costs) :
node1Itr(node1Itr), node2Itr(node2Itr), costs(costs) {
assert((costs.getRows() > 0) && (costs.getCols() > 0) &&
"Can't have zero-dimensioned cost matrices");
}
Matrix& getCosts() { return costs; }
const Matrix& getCosts() const { return costs; }
const NodeIterator& getNode1Itr() const { return node1Itr; }
const NodeIterator& getNode2Itr() const { return node2Itr; }
void setNode1ThisEdgeItr(const NodeAdjEdgeIterator &node1ThisEdgeItr) {
this->node1ThisEdgeItr = node1ThisEdgeItr;
}
const NodeAdjEdgeIterator& getNode1ThisEdgeItr() const {
return node1ThisEdgeItr;
}
void setNode2ThisEdgeItr(const NodeAdjEdgeIterator &node2ThisEdgeItr) {
this->node2ThisEdgeItr = node2ThisEdgeItr;
}
const NodeAdjEdgeIterator& getNode2ThisEdgeItr() const {
return node2ThisEdgeItr;
}
};
}
#endif // LLVM_CODEGEN_PBQP_GRAPHBASE_HPP