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src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/extended/MultiGuardNode.java
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rev 56282 : [mq]: graal
@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -30,10 +30,12 @@
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.Node;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.NodeInputList;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.graph.spi.Simplifiable;
import org.graalvm.compiler.graph.spi.SimplifierTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.nodes.ValueNode;
@@ -41,11 +43,11 @@
import org.graalvm.compiler.nodes.spi.LIRLowerable;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
import org.graalvm.compiler.nodes.util.GraphUtil;
@NodeInfo(allowedUsageTypes = Guard, cycles = CYCLES_0, size = SIZE_0)
-public final class MultiGuardNode extends FloatingNode implements GuardingNode, LIRLowerable, Simplifiable, Node.ValueNumberable {
+public final class MultiGuardNode extends FloatingNode implements GuardingNode, LIRLowerable, Simplifiable, Canonicalizable, Node.ValueNumberable {
public static final NodeClass<MultiGuardNode> TYPE = NodeClass.create(MultiGuardNode.class);
@OptionalInput(Guard) NodeInputList<ValueNode> guards;
public MultiGuardNode(ValueNode... guards) {
@@ -56,10 +58,24 @@
@Override
public void generate(NodeLIRBuilderTool generator) {
}
@Override
+ public Node canonical(CanonicalizerTool tool) {
+ // Make sure there are no nulls remaining in the set of guards references.
+ guards.trim();
+ if (guards.size() == 0) {
+ // No guards left => can delete the multi-guard.
+ return null;
+ } else if (guards.size() == 1) {
+ // Only a single guard left => replace multi-guard with that single guard.
+ return guards.get(0);
+ }
+ return this;
+ }
+
+ @Override
public void simplify(SimplifierTool tool) {
if (usages().filter(node -> node instanceof ValueAnchorNode).isNotEmpty()) {
/*
* For ValueAnchorNode usages, we can optimize MultiGuardNodes away if they depend on
* zero or one floating nodes (as opposed to fixed nodes).
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