#include "Support/iterator"
#include "Support/STLExtras.h"
-class DSNodeIterator : public forward_iterator<DSNode, ptrdiff_t> {
+template<typename NodeTy>
+class DSNodeIterator : public forward_iterator<const DSNode, ptrdiff_t> {
friend class DSNode;
- DSNode * const Node;
- unsigned Link;
+ NodeTy * const Node;
+ unsigned Offset;
- typedef DSNodeIterator _Self;
-
- DSNodeIterator(DSNode *N) : Node(N), Link(0) {} // begin iterator
- DSNodeIterator(DSNode *N, bool) // Create end iterator
- : Node(N), Link(N->getSize()) {
+ typedef DSNodeIterator<NodeTy> _Self;
+
+ DSNodeIterator(NodeTy *N) : Node(N), Offset(0) {} // begin iterator
+ DSNodeIterator(NodeTy *N, bool) : Node(N) { // Create end iterator
+ Offset = N->getNumLinks() << DS::PointerShift;
+ if (Offset == 0 && Node->getForwardNode() &&
+ Node->isDeadNode()) // Model Forward link
+ Offset += DS::PointerSize;
}
public:
+ DSNodeIterator(const DSNodeHandle &NH)
+ : Node(NH.getNode()), Offset(NH.getOffset()) {}
bool operator==(const _Self& x) const {
- return Link == x.Link;
+ return Offset == x.Offset;
}
bool operator!=(const _Self& x) const { return !operator==(x); }
const _Self &operator=(const _Self &I) {
assert(I.Node == Node && "Cannot assign iterators to two different nodes!");
- Link = I.Link;
+ Offset = I.Offset;
return *this;
}
pointer operator*() const {
- DSNodeHandle *NH = Node->getLink(Link);
- return NH ? NH->getNode() : 0;
+ if (Node->isDeadNode())
+ return Node->getForwardNode();
+ else
+ return Node->getLink(Offset).getNode();
}
pointer operator->() const { return operator*(); }
_Self& operator++() { // Preincrement
- ++Link;
+ Offset += (1 << DS::PointerShift);
return *this;
}
_Self operator++(int) { // Postincrement
_Self tmp = *this; ++*this; return tmp;
}
- unsigned getLink() const { return Link; }
- DSNode *getNode() const { return Node; }
+ unsigned getOffset() const { return Offset; }
+ const DSNode *getNode() const { return Node; }
};
// Provide iterators for DSNode...
-inline DSNode::iterator DSNode::begin() { return DSNodeIterator(this); }
-inline DSNode::iterator DSNode::end() { return DSNodeIterator(this, false); }
+inline DSNode::iterator DSNode::begin() {
+ return DSNode::iterator(this);
+}
+inline DSNode::iterator DSNode::end() {
+ return DSNode::iterator(this, false);
+}
+inline DSNode::const_iterator DSNode::begin() const {
+ return DSNode::const_iterator(this);
+}
+inline DSNode::const_iterator DSNode::end() const {
+ return DSNode::const_iterator(this, false);
+}
template <> struct GraphTraits<DSNode*> {
typedef DSNode NodeType;
static ChildIteratorType child_end(NodeType *N) { return N->end(); }
};
-static DSNode &dereference(DSNode *N) { return *N; }
+template <> struct GraphTraits<const DSNode*> {
+ typedef const DSNode NodeType;
+ typedef DSNode::const_iterator ChildIteratorType;
+
+ static NodeType *getEntryNode(NodeType *N) { return N; }
+ static ChildIteratorType child_begin(NodeType *N) { return N->begin(); }
+ static ChildIteratorType child_end(NodeType *N) { return N->end(); }
+};
+
+static DSNode &dereference ( DSNode *N) { return *N; }
+static const DSNode &dereferenceC(const DSNode *N) { return *N; }
template <> struct GraphTraits<DSGraph*> {
typedef DSNode NodeType;
// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
typedef mapped_iterator<std::vector<DSNode*>::iterator,
DerefFun> nodes_iterator;
- static nodes_iterator nodes_begin(DSGraph *G) { return map_iterator(G->getNodes().begin(), DerefFun(dereference));}
- static nodes_iterator nodes_end (DSGraph *G) { return map_iterator(G->getNodes().end(), DerefFun(dereference)); }
+ static nodes_iterator nodes_begin(DSGraph *G) {
+ return map_iterator(G->getNodes().begin(), DerefFun(dereference));
+ }
+ static nodes_iterator nodes_end(DSGraph *G) {
+ return map_iterator(G->getNodes().end(), DerefFun(dereference));
+ }
static ChildIteratorType child_begin(NodeType *N) { return N->begin(); }
static ChildIteratorType child_end(NodeType *N) { return N->end(); }
};
+template <> struct GraphTraits<const DSGraph*> {
+ typedef const DSNode NodeType;
+ typedef DSNode::const_iterator ChildIteratorType;
+
+ typedef std::pointer_to_unary_function<const DSNode *,const DSNode&> DerefFun;
+
+ // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
+ typedef mapped_iterator<std::vector<DSNode*>::const_iterator,
+ DerefFun> nodes_iterator;
+ static nodes_iterator nodes_begin(const DSGraph *G) {
+ return map_iterator(G->getNodes().begin(), DerefFun(dereferenceC));
+ }
+ static nodes_iterator nodes_end(const DSGraph *G) {
+ return map_iterator(G->getNodes().end(), DerefFun(dereferenceC));
+ }
+
+ static ChildIteratorType child_begin(const NodeType *N) { return N->begin(); }
+ static ChildIteratorType child_end(const NodeType *N) { return N->end(); }
+};
+
#endif