import java.lang.reflect.*;
/** implements Tomita's Graph Structured Stack */
-class GSS {
+public class GSS {
public static int count = 0;
+ public static int shifts = 0;
+ public static int reductions = 0;
public GSS() { }
public int resets = 0;
public int waits = 0;
+ // FIXME: right now, these are the performance bottleneck
HashMapBag<Sequence,Phase.Waiting> waiting = new HashMapBag<Sequence,Phase.Waiting>();
HashMapBag<Integer,Sequence> performed = new HashMapBag<Integer,Sequence>();
HashMapBag<Integer,Sequence> lastperformed = new HashMapBag<Integer,Sequence>();
public Iterator<Phase.Node> iterator() { return hash.iterator(); }
public void invoke(State st, Forest result, Node n) {
+ shifts++;
good |= next.newNode(n, result, st, false);
}
boolean reducing;
private IntPairMap<Phase.Node> hash; /* ALLOC */
- private IntPairMap<Forest> singularReductions; /* ALLOC */
private boolean closed;
private boolean good;
private Phase next = null;
lastperformed.addAll(performed);
performed.clear();
hash = new IntPairMap<Phase.Node>();
- singularReductions = new IntPairMap<Forest>();
reset = false;
good = false;
closed = false;
}
}
}
+
private boolean newNode2(Node p, Node parent, Forest pending, State state, boolean fromEmptyReduction) {
- //if (p.parents().contains(parent)) return true;
- p.merge(parent, pending);
+ if (p.merge(parent, pending)) return true;
p.parents().add(parent, true);
if (p!=parent && !fromEmptyReduction && reducing) p.performReductions(parent);
return true;
}
+
private boolean newNode3(Node parent, Forest pending, State state, boolean fromEmptyReduction) {
do {
if (token != null && state.canShift(token)) break;
// this massively improves GC performance
if (prev!=null && parser.helpgc) {
prev.hash = null;
- prev.singularReductions = null;
}
this.next = next;
closed = true;
final class Node implements Invokable<Position, Node, Node>, IntegerMappable, GraphViz.ToGraphViz {
public FastSet<Node> set = new FastSet<Node>();
- public GraphViz.Node toGraphViz(GraphViz gv) {
- if (gv.hasNode(this)) return gv.createNode(this);
- GraphViz.Node n = gv.createNode(this);
- n.label = ""+state.toStringx();
- n.shape = "rectangle";
- n.fill = "green";
- //GraphViz.Node f = pending().toGraphViz(gv);
- //n.add(f);
- for(Forest result : results()) n.edge(result, "");
- for(Node parent : parents()) n.edge(parent, "");
- ((GraphViz.Group)phase().toGraphViz(gv)).add(n);
- return n;
- }
- public boolean isTransparent() { return false; }
- public boolean isHidden() { return false; }
-
-
- //private Forest.Ref holder = new Forest.Ref();
+
private boolean allqueued = false;
/** what state this node is in */
/** which Phase this Node belongs to (node that Node is also a non-static inner class of Phase) */
public Phase phase() { return Phase.this; }
- //private Forest pending() { return !Phase.this.closed ? holder : holder.resolve(); }
- private HashMap<Node,Forest> resultMap = new HashMap<Node,Forest>();
- public void merge(Node parent, Forest result) {
- //holder.merge(result);
- Forest.Ref f = (Forest.Ref)resultMap.get(parent);
- if (f==null) { f = new Forest.Ref(); resultMap.put(parent, f); }
+
+ private HashSet<Forest.Ref> resultMap = new HashSet<Forest.Ref>();
+ public Iterable<Forest.Ref> results() { return resultMap; }
+ public FastSet<Node> parents() { return set; }
+ public boolean merge(Node parent, Forest result) {
+ // FIXME: inefficient!
+ for(Forest.Ref f : results()) {
+ if (f.parents.contains(parent) /* UGLY: */ && f.parents.size()==1) {
+ f.merge(result);
+ return true;
+ }
+ }
+ Forest.Ref f = new Forest.Ref();
+ f.parents.add(parent);
f.merge(result);
+ resultMap.add(f);
set.add(parent, true);
+ return false;
}
- //public Iterable<Node> childrenFor(Forest result) { return resultMap.getAll(result); }
- public Iterable<Forest> results() { return resultMap.values(); }
- private Forest pending(Node n) {
- //return !Phase.this.closed ? holder : holder.resolve();
- /*
- for(Forest f : resultMap)
- if (resultMap.contains(f, n))
- return f;
- return null;
- */
- return resultMap.get(n);
- }
- public FastSet<Node> parents() { return set; }
public void performReductions() {
if (allqueued) return;
public void performEmptyReductions() { state.invokeReductions(token, this, null, null); }
public final void invoke(Position r, Node n, Node n2) {
- //if (r.owner().lame) return;
+ reductions++;
if (n==null || n2==null || r.pos==0) {
if (r.pos==0) {
if (n==null) n = this;
}
if (n==null) return;
Forest[] holder = new Forest[r.pos];
- if (r.pos==0) n.finish(r, r.zero(), n.phase(), holder);
- else n.reduce(r, r.pos-1, n.phase(), holder, null, n.pending(n));
+ if (r.pos==0) n.finish(r, r.zero(), n.phase());
+ else n.reduce(r, r.pos-1, n.phase(), null);
} else {
- Forest[] holder = new Forest[r.pos];
if (r.pos<=0) throw new Error("called wrong form of reduce()");
int pos = r.pos-1;
- n.reduce(r, pos, n.phase(), holder, n2, n.pending(n));
+ n.reduce(r, pos, n.phase(), n2);
}
}
- /*
- public void reduce(Position r, int pos, Phase target, Forest[] holder) {
- reduce(r, pos, target, holder, null); }
- public void reduce(Position r, int pos, Phase target, Forest[] holder, Node only) {
- reduce(r, pos, target, holder, only, this.pending());
- }
- */
- public void reduce(Position r, int pos, Phase target, Forest[] holder, Node only, Forest pending) {
+ public void reduce(Position r, int pos, Phase target, Node only) {
+ Forest[] holder = r.holder;
Forest old = holder[pos];
- holder[pos] = pending;
- if (pos==0) {
-
- // FIXME: I'm unsure about this -- basically we want to deal with the case where
- // there are two nodes, each of whose Ref points to the same Forest instance.
- // Some node in the next phase has both of these as parents. This might happen
- // since the same reduction can appear in more than one state.
-
- if (only != null) {
- holder[pos] = pending(only);
- System.arraycopy(holder, 0, r.holder, 0, holder.length);
- for(int i=0; i<r.pos; i++) if (r.holder[i]==null) throw new Error("realbad");
- Forest rex = null;
- if (r.pos==1) rex = singularReductions.get(pending, r);
- if (rex==null) {
- rex = r.rewrite(phase().getLocation());
- if (r.pos==1) singularReductions.put(pending, r, rex);
- }
- only.finish(r, rex, target, holder);
- } else {
- for(Forest result : results()) {
- pending = holder[pos] = result;
- System.arraycopy(holder, 0, r.holder, 0, holder.length);
- for(int i=0; i<r.pos; i++) if (r.holder[i]==null) throw new Error("realbad");
- Forest rex = null;
- if (rex==null && r.pos==1) rex = singularReductions.get(pending, r);
- if (rex==null) {
- rex = r.rewrite(phase().getLocation());
- if (r.pos==1) singularReductions.put(pending, r, rex);
- }
- for(Node child : parents()) {
- if (pending(child)==result)
- child.finish(r, rex, target, holder);
- }
- }
- }
- } else {
- if (only != null) {
- holder[pos] = pending(only);
- only.reduce(r, pos-1, target, holder, null, only.pending(only));
- } else {
- for(Node child : this.parents()) {
- holder[pos] = pending(child);
- child.reduce(r, pos-1, target, holder, null, child.pending(child));
- }
+
+ for(Forest result : results())
+ for(Node child : ((Forest.Ref<?>)result).parents) {
+ if (only != null && child!=only) continue;
+ holder[pos] = result;
+ if (pos==0) child.finish(r, r.rewrite(phase().getLocation()), target);
+ else child.reduce(r, pos-1, target, null);
}
- }
+
holder[pos] = old;
}
- public void finish(Position r, Forest result, Phase<Tok> target, Forest[] holder) {
+ public void finish(Position r, Forest result, Phase<Tok> target) {
Parser.Table<Tok>.State<Tok> state0 = state.gotoSetNonTerminals.get(r.owner());
if (result==null) throw new Error();
if (state0!=null)
}
public int toInt() { return idx; }
private final int idx = node_idx++;
+
+ // GraphViz //////////////////////////////////////////////////////////////////////////////
+
+ public GraphViz.Node toGraphViz(GraphViz gv) {
+ if (gv.hasNode(this)) return gv.createNode(this);
+ GraphViz.Node n = gv.createNode(this);
+ n.label = ""+state.toStringx();
+ n.shape = "rectangle";
+ n.fill = "green";
+ for(Forest result : results()) n.edge(result, "");
+ for(Node parent : parents()) n.edge(parent, "");
+ ((GraphViz.Group)phase().toGraphViz(gv)).add(n);
+ return n;
+ }
+ public boolean isTransparent() { return false; }
+ public boolean isHidden() { return false; }
+
}
private int node_idx = 0;
projects / sbp.git / blobdiff