X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FGSS.java;h=6db929bb8893f33fde1ff7f70c87b18665b729b4;hp=26b64486bf81c7ee4e323ad600851ac65146cbe0;hb=f169adc2b98fc4034d67bab4dd2938fb2f15e5c4;hpb=ea98ead8a9a46a7314da6faac96a31bfecd7002b
diff --git a/src/edu/berkeley/sbp/GSS.java b/src/edu/berkeley/sbp/GSS.java
index 26b6448..6db929b 100644
--- a/src/edu/berkeley/sbp/GSS.java
+++ b/src/edu/berkeley/sbp/GSS.java
@@ -21,16 +21,14 @@ import java.lang.reflect.*;
// class is meant to remain simple and easy to understand;
// optimizations which obscure that do not belong here (they
// should go into the compiled version instead)
-//
-// - most of our time is now spent creating and storing Reduct instances
-// - we should be able to perform Reduct's immediately after creating them...
-//
/** implements Tomita's Graph Structured Stack */
class GSS {
public GSS() { }
+ private Phase.Node[] reducing_list = null;
+
/** corresponds to a positions between tokens the input stream; same as Tomita's U_i's */
public class Phase {
@@ -43,18 +41,9 @@ class GSS {
/** FIXME */
public Forest.Ref finalResult = null;
- /** all reductions (pending and completed) */
- private HashSet reductions = new HashSet(); /* ALLOC */
-
/** all nodes, keyed by the value returned by code() */
private HashMap hash = new HashMap(); /* ALLOC */
- /** the number of pending reductions */
- private int pendingReductions = 0;
- private int totalReductions = 0;
- //private HashSet pendingReduct = new HashSet();
- private LinkedList pendingReduct = new LinkedList();
-
/** the number of nodes in this phase */
private int numNodes = 0;
@@ -91,8 +80,8 @@ class GSS {
}
private void newNode2(Node p, Node parent, Forest pending, Parser.Table.State state, boolean fromEmptyReduction, Phase start) {
p.holder.merge(pending);
- if (p.parents.contains(parent)) return;
- p.parents.add(parent, true);
+ if (p.parents().contains(parent)) return;
+ p.parents().add(parent, true);
if (p!=parent && !fromEmptyReduction) p.queueReductions(parent);
}
private void newNode3(Node parent, Forest pending, Parser.Table.State state, boolean fromEmptyReduction, Phase start) {
@@ -103,7 +92,7 @@ class GSS {
int count = 0;
Parser.Table.Reduction r = null;
for(Parser.Table.Reduction red : token==null ? state.getEofReductions() : state.getReductions(token)) { r = red; count++; }
- //if (count==0) return; // BEWARE! this optimization is suspected to cause really nasty heisenbugs
+ if (count==0) return; // BEWARE! this optimization is suspected to cause really nasty heisenbugs
//if (count > 1) break;
//if (r.numPop == 0) break;
//r.reduce(pending, parent, null, Phase.this, null);
@@ -112,7 +101,7 @@ class GSS {
Node n = new Node(parent, pending, state, start); // ALLOC
n.queueEmptyReductions();
- if (!fromEmptyReduction) n.queueReductions();
+ if (!fromEmptyReduction) n.queueReductions(parent);
}
@@ -120,13 +109,17 @@ class GSS {
/** perform all reduction operations */
public void reduce() {
reducing = true;
- HashSet s = new HashSet();
- s.addAll(hash.values());
- for(Phase.Node n : s) n.queueEmptyReductions();
- for(Phase.Node n : s) n.queueReductions();
- while(pendingReduct.size()>0)
- //pendingReduct.iterator().next().go();
- pendingReduct.removeFirst().go();
+ if (reducing_list==null || reducing_list.length < hash.size())
+ reducing_list = new Phase.Node[hash.size() * 4];
+ Collection hv = hash.values();
+ hv.toArray(reducing_list);
+ int num = hv.size();
+ for(int i=0; inext */
@@ -154,13 +147,13 @@ class GSS {
if (!ok && token != null) {
StringBuffer error = new StringBuffer();
error.append("error: unable to shift token \"" + token + "\"\n");
- error.append(" before: " +pendingReductions+ "\n");
- error.append(" before: " +totalReductions+ "\n");
+ //error.append(" before: " +pendingReductions+ "\n");
+ //error.append(" before: " +totalReductions+ "\n");
//for(Phase.Node n : hash.values()) {
//n.queueReductions();
//n.queueEmptyReductions();
//}
- error.append(" after: " +pendingReductions+ "\n");
+ //error.append(" after: " +pendingReductions+ "\n");
error.append(" candidate states:\n");
for(Phase.Node n : hash.values()) {
//for(Sequence.Position p : n.state) error.append(" " + p + "\n");
@@ -172,26 +165,26 @@ class GSS {
}
// this massively improves GC performance
- reductions = null;
hash = null;
}
// GSS Nodes //////////////////////////////////////////////////////////////////////////////
- //private HashMap pcache = new HashMap();
/** a node in the GSS */
- public final class Node {
+ public final class Node extends FastSet {
private Forest.Ref holder = null;
+ private boolean allqueued = false;
private HashMap cache = null;
/** the set of nodes to which there is an edge starting at this node */
- public final FastSet parents = new FastSet(); /* ALLOC */
+ //public final FastSet parents = new FastSet(); /* ALLOC */
/** what state this node is in */
public final Parser.Table.State state;
+
/** which Phase this Node belongs to (node that Node is also a non-static inner class of Phase) */
public final Phase phase = Phase.this;
@@ -199,17 +192,48 @@ class GSS {
return cache==null ? (cache = new HashMap()) : cache; }
public Forest.Ref holder() { return holder==null ? (holder = new Forest.Ref()) : holder; }
public Forest pending() { return Phase.this.closed ? holder().resolve() : holder; }
- public FastSet parents() { return parents; }
+ public FastSet parents() { return this; }
/** FIXME */
public void queueReductions() {
- for(Node n2 : parents)
- queueReductions(n2);
+ if (allqueued) return;
+ allqueued = true;
+ int where = parents().size();
+ for(int i=0; i result = null;
-
- public Reduct(Node n, Node n2, Parser.Table.Reduction r) {
- this.n = n;
- this.n2 = n2;
- this.r = r;
- if (reductions.contains(this)) { done = true; return; }
- reductions.add(this);
- pendingReduct.addFirst(this);
- pendingReductions++;
- //if (reducing) go();
- }
-
- /** perform the reduction */
- public void go() {
- if (done) return;
- done = true;
- pendingReduct.remove(this);
- pendingReductions--;
-
- if (r==null) {
- for(Parser.Table.Reduction r : token==null ? n.state.getEofReductions() : n.state.getReductions(token)) {
-
- // UGLY HACK
- // The problem here is that a "reduction of length 1"
- // performed twice with different values of n2 needs
- // to only create a *single* new result, but must add
- // multiple parents to the node holding that result.
- // The current reducer doesn't differentiate between
- // the next node of an n-pop reduction and the
- // ultimate parent of the last pop, so we need to
- // cache instances here as a way of avoiding
- // recreating them.
-
- // currently we have this weird problem where we
- // have to do an individual reduct for each child
- // when the reduction length is one (ie the
- // children wind up being children of the newly
- // created node rather than part of the popped
- // sequence
-
- if (r.numPop == 1) {
- Forest ret = n.cache().get(r);
- if (ret != null) r.reduce(n, n2, n.phase, ret);
- else n.cache().put(r, r.reduce(n, n2, n.phase, null));
- }
- }
- for(Parser.Table.Reduction r : token==null ? n.state.getEofReductions() : n.state.getReductions(token)) {
- if (r.numPop <= 1) continue;
- r.reduce(n, n2, Phase.this, null);
- }
- } else if (r.numPop != 1) {
- r.reduce(n, n2, Phase.this, null);
- }
- }
-
- // FIXME: this is a PITA
- public int hashCode() { return n.hashCode() ^ (r==null ? 0 : r.hashCode()) ^ (n2==null ? 0 : n2.hashCode()); }
- public boolean equals(Object o) {
- if (o==null) return false;
- if (o==this) return true;
- if (!(o instanceof Reduct)) return false;
- Reduct other = (Reduct)o;
- return equal(r, other.r) && equal(n, other.n) && equal(n2, other.n2);
- }
- }
-
}
/** helper method */