checkpoint harmony

[sbp.git] / src / edu / berkeley / sbp / GSS.java

diff --git a/src/edu/berkeley/sbp/GSS.java b/src/edu/berkeley/sbp/GSS.java
index 6316aad..1432402 100644 (file)
--- a/src/edu/berkeley/sbp/GSS.java
+++ b/src/edu/berkeley/sbp/GSS.java
@@ -285,12 +285,46 @@ class GSS {
                     }
                     if (n==null) return;
                     Forest[] holder = new Forest[r.position.pos];
-                    if (r.position.pos==0) r.finish(n, r.zero(), n.phase(), holder);
-                    else                   r.reduce(n, r.position.pos-1, n.phase(), holder);
+                    if (r.position.pos==0) n.finish(r, r.zero(), n.phase(), holder);
+                    else                   n.reduce(r, r.position.pos-1, n.phase(), holder);
                 } else {
-                    r.reduce(n, n2);
+                    Forest[] holder = new Forest[r.position.pos];
+                    if (r.position.pos<=0) throw new Error("called wrong form of reduce()");
+                    int pos = r.position.pos-1;
+                    Forest old = holder[pos];
+                    holder[pos] = n.pending();
+                    if (pos==0) {
+                        System.arraycopy(holder, 0, r.position.holder, 0, holder.length);
+                        Forest rex = r.position.rewrite(n.phase().getLocation());
+                        n2.finish(r, rex, n.phase(), holder);
+                    } else {
+                        n2.reduce(r, pos-1, n.phase(), holder);
+                    }
+                    holder[pos] = old;
                 }
             }
+
+            public void reduce(Reduction r, int pos, GSS.Phase target, Forest[] holder) {
+                Forest old = holder[pos];
+                holder[pos] = this.pending();
+                if (pos==0) {
+                    System.arraycopy(holder, 0, r.position.holder, 0, holder.length);
+                    for(int i=0; i<r.position.pos; i++) if (r.position.holder[i]==null) throw new Error("realbad");
+                    Forest rex = r.position.rewrite(target.getLocation());
+                    for(GSS.Phase.Node child : this.parents()) child.finish(r, rex, target, holder);
+                } else {
+                    for(GSS.Phase.Node child : this.parents()) child.reduce(r, pos-1, target, holder);
+                }
+                holder[pos] = old;
+            }
+
+            public void finish(Reduction r, Forest result, GSS.Phase target, Forest[] holder) {
+                State state0 = state.gotoSetNonTerminals.get(r.position.owner());
+                if (result==null) throw new Error();
+                if (state0!=null)
+                    target.newNode(this, result, state0, r.position.pos<=0, r);
+            }
+
             public void performEmptyReductions() { state.invokeReductions(token, this, null, null); }
 
             private Node(Node parent, Forest pending, State state) {