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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6842 91177308-0d34-0410-b5e6-96231b3b80d8
143 lines
4.7 KiB
C++
143 lines
4.7 KiB
C++
//===- DSGraphTraits.h - Provide generic graph interface --------*- C++ -*-===//
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//
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// This file provides GraphTraits specializations for the DataStructure graph
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// nodes, allowing datastructure graphs to be processed by generic graph
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// algorithms.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_DSGRAPHTRAITS_H
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#define LLVM_ANALYSIS_DSGRAPHTRAITS_H
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#include "llvm/Analysis/DSGraph.h"
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#include "Support/GraphTraits.h"
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#include "Support/iterator"
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#include "Support/STLExtras.h"
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template<typename NodeTy>
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class DSNodeIterator : public forward_iterator<const DSNode, ptrdiff_t> {
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friend class DSNode;
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NodeTy * const Node;
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unsigned Offset;
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typedef DSNodeIterator<NodeTy> _Self;
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DSNodeIterator(NodeTy *N) : Node(N), Offset(0) {} // begin iterator
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DSNodeIterator(NodeTy *N, bool) : Node(N) { // Create end iterator
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Offset = N->getNumLinks() << DS::PointerShift;
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if (Offset == 0 && Node->getForwardNode() &&
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Node->isDeadNode()) // Model Forward link
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Offset += DS::PointerSize;
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}
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public:
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DSNodeIterator(const DSNodeHandle &NH)
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: Node(NH.getNode()), Offset(NH.getOffset()) {}
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bool operator==(const _Self& x) const {
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return Offset == x.Offset;
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}
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bool operator!=(const _Self& x) const { return !operator==(x); }
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const _Self &operator=(const _Self &I) {
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assert(I.Node == Node && "Cannot assign iterators to two different nodes!");
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Offset = I.Offset;
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return *this;
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}
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pointer operator*() const {
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if (Node->isDeadNode())
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return Node->getForwardNode();
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else
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return Node->getLink(Offset).getNode();
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}
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pointer operator->() const { return operator*(); }
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_Self& operator++() { // Preincrement
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Offset += (1 << DS::PointerShift);
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return *this;
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}
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_Self operator++(int) { // Postincrement
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_Self tmp = *this; ++*this; return tmp;
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}
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unsigned getOffset() const { return Offset; }
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const DSNode *getNode() const { return Node; }
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};
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// Provide iterators for DSNode...
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inline DSNode::iterator DSNode::begin() {
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return DSNode::iterator(this);
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}
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inline DSNode::iterator DSNode::end() {
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return DSNode::iterator(this, false);
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}
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inline DSNode::const_iterator DSNode::begin() const {
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return DSNode::const_iterator(this);
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}
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inline DSNode::const_iterator DSNode::end() const {
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return DSNode::const_iterator(this, false);
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}
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template <> struct GraphTraits<DSNode*> {
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typedef DSNode NodeType;
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typedef DSNode::iterator ChildIteratorType;
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static NodeType *getEntryNode(NodeType *N) { return N; }
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static ChildIteratorType child_begin(NodeType *N) { return N->begin(); }
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static ChildIteratorType child_end(NodeType *N) { return N->end(); }
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};
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template <> struct GraphTraits<const DSNode*> {
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typedef const DSNode NodeType;
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typedef DSNode::const_iterator ChildIteratorType;
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static NodeType *getEntryNode(NodeType *N) { return N; }
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static ChildIteratorType child_begin(NodeType *N) { return N->begin(); }
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static ChildIteratorType child_end(NodeType *N) { return N->end(); }
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};
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static DSNode &dereference ( DSNode *N) { return *N; }
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static const DSNode &dereferenceC(const DSNode *N) { return *N; }
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template <> struct GraphTraits<DSGraph*> {
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typedef DSNode NodeType;
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typedef DSNode::iterator ChildIteratorType;
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typedef std::pointer_to_unary_function<DSNode *, DSNode&> DerefFun;
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef mapped_iterator<std::vector<DSNode*>::iterator,
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DerefFun> nodes_iterator;
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static nodes_iterator nodes_begin(DSGraph *G) {
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return map_iterator(G->getNodes().begin(), DerefFun(dereference));
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}
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static nodes_iterator nodes_end(DSGraph *G) {
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return map_iterator(G->getNodes().end(), DerefFun(dereference));
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}
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static ChildIteratorType child_begin(NodeType *N) { return N->begin(); }
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static ChildIteratorType child_end(NodeType *N) { return N->end(); }
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};
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template <> struct GraphTraits<const DSGraph*> {
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typedef const DSNode NodeType;
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typedef DSNode::const_iterator ChildIteratorType;
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typedef std::pointer_to_unary_function<const DSNode *,const DSNode&> DerefFun;
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef mapped_iterator<std::vector<DSNode*>::const_iterator,
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DerefFun> nodes_iterator;
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static nodes_iterator nodes_begin(const DSGraph *G) {
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return map_iterator(G->getNodes().begin(), DerefFun(dereferenceC));
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}
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static nodes_iterator nodes_end(const DSGraph *G) {
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return map_iterator(G->getNodes().end(), DerefFun(dereferenceC));
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}
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static ChildIteratorType child_begin(const NodeType *N) { return N->begin(); }
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static ChildIteratorType child_end(const NodeType *N) { return N->end(); }
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};
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#endif
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