mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
4a20c7a0a9
2. Allow SCCIterator to work with inverse graphs. 3. Fix an incorrect comment in GraphTraits.h (the type in the comment was given as GraphType* when it is actually const GraphType &). Patch by Patrick Alexander Simmons. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89091 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
//===-- llvm/ADT/GraphTraits.h - Graph traits template ----------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the little GraphTraits<X> template class that should be
|
|
// specialized by classes that want to be iteratable by generic graph iterators.
|
|
//
|
|
// This file also defines the marker class Inverse that is used to iterate over
|
|
// graphs in a graph defined, inverse ordering...
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_GRAPHTRAITS_H
|
|
#define LLVM_ADT_GRAPHTRAITS_H
|
|
|
|
namespace llvm {
|
|
|
|
// GraphTraits - This class should be specialized by different graph types...
|
|
// which is why the default version is empty.
|
|
//
|
|
template<class GraphType>
|
|
struct GraphTraits {
|
|
// Elements to provide:
|
|
|
|
// typedef NodeType - Type of Node in the graph
|
|
// typedef ChildIteratorType - Type used to iterate over children in graph
|
|
|
|
// static NodeType *getEntryNode(const GraphType &)
|
|
// Return the entry node of the graph
|
|
|
|
// static ChildIteratorType child_begin(NodeType *)
|
|
// static ChildIteratorType child_end (NodeType *)
|
|
// Return iterators that point to the beginning and ending of the child
|
|
// node list for the specified node.
|
|
//
|
|
|
|
|
|
// typedef ...iterator nodes_iterator;
|
|
// static nodes_iterator nodes_begin(GraphType *G)
|
|
// static nodes_iterator nodes_end (GraphType *G)
|
|
//
|
|
// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
|
|
|
|
|
|
// If anyone tries to use this class without having an appropriate
|
|
// specialization, make an error. If you get this error, it's because you
|
|
// need to include the appropriate specialization of GraphTraits<> for your
|
|
// graph, or you need to define it for a new graph type. Either that or
|
|
// your argument to XXX_begin(...) is unknown or needs to have the proper .h
|
|
// file #include'd.
|
|
//
|
|
typedef typename GraphType::UnknownGraphTypeError NodeType;
|
|
};
|
|
|
|
|
|
// Inverse - This class is used as a little marker class to tell the graph
|
|
// iterator to iterate over the graph in a graph defined "Inverse" ordering.
|
|
// Not all graphs define an inverse ordering, and if they do, it depends on
|
|
// the graph exactly what that is. Here's an example of usage with the
|
|
// df_iterator:
|
|
//
|
|
// idf_iterator<Method*> I = idf_begin(M), E = idf_end(M);
|
|
// for (; I != E; ++I) { ... }
|
|
//
|
|
// Which is equivalent to:
|
|
// df_iterator<Inverse<Method*> > I = idf_begin(M), E = idf_end(M);
|
|
// for (; I != E; ++I) { ... }
|
|
//
|
|
template <class GraphType>
|
|
struct Inverse {
|
|
const GraphType &Graph;
|
|
|
|
inline Inverse(const GraphType &G) : Graph(G) {}
|
|
};
|
|
|
|
// Provide a partial specialization of GraphTraits so that the inverse of an
|
|
// inverse falls back to the original graph.
|
|
template<class T>
|
|
struct GraphTraits<Inverse<Inverse<T> > > {
|
|
typedef typename GraphTraits<T>::NodeType NodeType;
|
|
typedef typename GraphTraits<T>::ChildIteratorType ChildIteratorType;
|
|
|
|
static NodeType *getEntryNode(Inverse<Inverse<T> > *G) {
|
|
return GraphTraits<T>::getEntryNode(G->Graph.Graph);
|
|
}
|
|
|
|
static ChildIteratorType child_begin(NodeType* N) {
|
|
return GraphTraits<T>::child_begin(N);
|
|
}
|
|
|
|
static ChildIteratorType child_end(NodeType* N) {
|
|
return GraphTraits<T>::child_end(N);
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|