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107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
//===-- llvm/ADT/GraphTraits.h - Graph traits template ----------*- 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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// This file defines the little GraphTraits<X> template class that should be
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// specialized by classes that want to be iteratable by generic graph iterators.
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//
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// This file also defines the marker class Inverse that is used to iterate over
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// graphs in a graph defined, inverse ordering...
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_GRAPHTRAITS_H
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#define LLVM_ADT_GRAPHTRAITS_H
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namespace llvm {
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// GraphTraits - This class should be specialized by different graph types...
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// which is why the default version is empty.
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//
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template<class GraphType>
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struct GraphTraits {
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// Elements to provide:
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// typedef NodeType - Type of Node in the graph
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// typedef ChildIteratorType - Type used to iterate over children in graph
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// static NodeType *getEntryNode(const GraphType &)
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// Return the entry node of the graph
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// static ChildIteratorType child_begin(NodeType *)
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// static ChildIteratorType child_end (NodeType *)
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// Return iterators that point to the beginning and ending of the child
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// node list for the specified node.
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//
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// typedef ...iterator nodes_iterator;
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// static nodes_iterator nodes_begin(GraphType *G)
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// static nodes_iterator nodes_end (GraphType *G)
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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// static unsigned size (GraphType *G)
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// Return total number of nodes in the graph
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//
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// If anyone tries to use this class without having an appropriate
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// specialization, make an error. If you get this error, it's because you
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// need to include the appropriate specialization of GraphTraits<> for your
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// graph, or you need to define it for a new graph type. Either that or
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// your argument to XXX_begin(...) is unknown or needs to have the proper .h
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// file #include'd.
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//
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typedef typename GraphType::UnknownGraphTypeError NodeType;
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};
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// Inverse - This class is used as a little marker class to tell the graph
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// iterator to iterate over the graph in a graph defined "Inverse" ordering.
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// Not all graphs define an inverse ordering, and if they do, it depends on
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// the graph exactly what that is. Here's an example of usage with the
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// df_iterator:
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//
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// idf_iterator<Method*> I = idf_begin(M), E = idf_end(M);
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// for (; I != E; ++I) { ... }
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//
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// Which is equivalent to:
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// df_iterator<Inverse<Method*> > I = idf_begin(M), E = idf_end(M);
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// for (; I != E; ++I) { ... }
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//
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template <class GraphType>
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struct Inverse {
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const GraphType &Graph;
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inline Inverse(const GraphType &G) : Graph(G) {}
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};
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// Provide a partial specialization of GraphTraits so that the inverse of an
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// inverse falls back to the original graph.
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template<class T>
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struct GraphTraits<Inverse<Inverse<T> > > {
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typedef typename GraphTraits<T>::NodeType NodeType;
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typedef typename GraphTraits<T>::ChildIteratorType ChildIteratorType;
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static NodeType *getEntryNode(Inverse<Inverse<T> > *G) {
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return GraphTraits<T>::getEntryNode(G->Graph.Graph);
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}
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static ChildIteratorType child_begin(NodeType* N) {
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return GraphTraits<T>::child_begin(N);
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}
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static ChildIteratorType child_end(NodeType* N) {
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return GraphTraits<T>::child_end(N);
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}
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};
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} // End llvm namespace
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#endif
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