# HG changeset patch
# User Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
# Date 1366994417 -7200
# Node ID 199c77760850d08d90d1f2891d2ca0b649060439
# Parent  e162d9e32830d5f05f3fc79f76f86cc75d3e7df9
Rename InputChangedListener => NodeChangedListener. Add event for usage count of a node dropping to 0.

diff -r e162d9e32830 -r 199c77760850 graal/com.oracle.graal.graph/src/com/oracle/graal/graph/Graph.java
--- a/graal/com.oracle.graal.graph/src/com/oracle/graal/graph/Graph.java	Fri Apr 26 17:15:10 2013 +0200
+++ b/graal/com.oracle.graal.graph/src/com/oracle/graal/graph/Graph.java	Fri Apr 26 18:40:17 2013 +0200
@@ -47,7 +47,8 @@
     private int deletedNodeCount;
     private GraphEventLog eventLog;
 
-    InputChangedListener inputChanged;
+    NodeChangedListener inputChanged;
+    NodeChangedListener usagesDroppedZero;
     private final HashMap<CacheEntry, Node> cachedNodes = new HashMap<>();
 
     private static final class CacheEntry {
@@ -152,12 +153,12 @@
         return node;
     }
 
-    public interface InputChangedListener {
+    public interface NodeChangedListener {
 
-        void inputChanged(Node node);
+        void nodeChanged(Node node);
     }
 
-    public void trackInputChange(InputChangedListener inputChangedListener) {
+    public void trackInputChange(NodeChangedListener inputChangedListener) {
         this.inputChanged = inputChangedListener;
     }
 
@@ -165,6 +166,14 @@
         inputChanged = null;
     }
 
+    public void trackUsagesDroppedZero(NodeChangedListener usagesDroppedZeroListener) {
+        this.usagesDroppedZero = usagesDroppedZeroListener;
+    }
+
+    public void stopTrackingUsagesDroppedZero() {
+        usagesDroppedZero = null;
+    }
+
     /**
      * Adds a new node to the graph, if a <i>similar</i> node already exists in the graph, the
      * provided node will not be added to the graph but the <i>similar</i> node will be returned
diff -r e162d9e32830 -r 199c77760850 graal/com.oracle.graal.graph/src/com/oracle/graal/graph/Node.java
--- a/graal/com.oracle.graal.graph/src/com/oracle/graal/graph/Node.java	Fri Apr 26 17:15:10 2013 +0200
+++ b/graal/com.oracle.graal.graph/src/com/oracle/graal/graph/Node.java	Fri Apr 26 18:40:17 2013 +0200
@@ -22,10 +22,11 @@
  */
 package com.oracle.graal.graph;
 
+import java.io.*;
 import java.lang.annotation.*;
 import java.util.*;
 
-import com.oracle.graal.graph.Graph.InputChangedListener;
+import com.oracle.graal.graph.Graph.NodeChangedListener;
 import com.oracle.graal.graph.NodeClass.*;
 import com.oracle.graal.graph.iterators.*;
 
@@ -193,12 +194,17 @@
                 assert assertTrue(result, "not found in usages, old input: %s", oldInput);
             }
             if (newInput != null) {
-                InputChangedListener inputChanged = graph.inputChanged;
+                NodeChangedListener inputChanged = graph.inputChanged;
                 if (inputChanged != null) {
-                    inputChanged.inputChanged(this);
+                    inputChanged.nodeChanged(this);
                 }
                 assert newInput.usages != null : "not yet added? " + newInput;
                 newInput.usages.add(this);
+            } else if (oldInput != null && oldInput.usages().isEmpty()) {
+                NodeChangedListener nodeChangedListener = graph.usagesDroppedZero;
+                if (nodeChangedListener != null) {
+                    nodeChangedListener.nodeChanged(oldInput);
+                }
             }
         }
     }
@@ -253,9 +259,9 @@
             boolean result = usage.getNodeClass().replaceFirstInput(usage, this, other);
             assert assertTrue(result, "not found in inputs, usage: %s", usage);
             if (other != null) {
-                InputChangedListener inputChanged = graph.inputChanged;
+                NodeChangedListener inputChanged = graph.inputChanged;
                 if (inputChanged != null) {
-                    inputChanged.inputChanged(usage);
+                    inputChanged.nodeChanged(usage);
                 }
                 other.usages.add(usage);
             }
@@ -299,6 +305,12 @@
 
         for (Node input : inputs()) {
             removeThisFromUsages(input);
+            if (input.usages().isEmpty()) {
+                NodeChangedListener nodeChangedListener = graph.usagesDroppedZero;
+                if (nodeChangedListener != null) {
+                    nodeChangedListener.nodeChanged(input);
+                }
+            }
         }
         getNodeClass().clearInputs(this);
     }
diff -r e162d9e32830 -r 199c77760850 graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/CanonicalizerPhase.java
--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/CanonicalizerPhase.java	Fri Apr 26 17:15:10 2013 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/CanonicalizerPhase.java	Fri Apr 26 18:40:17 2013 +0200
@@ -28,7 +28,7 @@
 import com.oracle.graal.api.meta.*;
 import com.oracle.graal.debug.*;
 import com.oracle.graal.graph.*;
-import com.oracle.graal.graph.Graph.InputChangedListener;
+import com.oracle.graal.graph.Graph.NodeChangedListener;
 import com.oracle.graal.nodes.*;
 import com.oracle.graal.nodes.calc.*;
 import com.oracle.graal.nodes.spi.*;
@@ -132,19 +132,22 @@
         }
 
         private void processWorkSet(StructuredGraph graph) {
-            graph.trackInputChange(new InputChangedListener() {
+            NodeChangedListener nodeChangedListener = new NodeChangedListener() {
 
                 @Override
-                public void inputChanged(Node node) {
+                public void nodeChanged(Node node) {
                     workList.addAgain(node);
                 }
-            });
+            };
+            graph.trackInputChange(nodeChangedListener);
+            graph.trackUsagesDroppedZero(nodeChangedListener);
 
             for (Node n : workList) {
                 processNode(n, graph);
             }
 
             graph.stopTrackingInputChange();
+            graph.stopTrackingUsagesDroppedZero();
         }
 
         private void processNode(Node node, StructuredGraph graph) {
diff -r e162d9e32830 -r 199c77760850 graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/IterativeConditionalEliminationPhase.java
--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/IterativeConditionalEliminationPhase.java	Fri Apr 26 17:15:10 2013 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/IterativeConditionalEliminationPhase.java	Fri Apr 26 18:40:17 2013 +0200
@@ -24,7 +24,7 @@
 
 import java.util.*;
 
-import com.oracle.graal.graph.Graph.InputChangedListener;
+import com.oracle.graal.graph.Graph.NodeChangedListener;
 import com.oracle.graal.graph.*;
 import com.oracle.graal.nodes.*;
 import com.oracle.graal.phases.*;
@@ -49,7 +49,7 @@
         }
     }
 
-    private static class Listener implements InputChangedListener {
+    private static class Listener implements NodeChangedListener {
 
         private final Set<Node> canonicalizationRoots;
 
@@ -58,7 +58,7 @@
         }
 
         @Override
-        public void inputChanged(Node node) {
+        public void nodeChanged(Node node) {
             canonicalizationRoots.add(node);
         }
     }