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/*
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.core.test;
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import org.graalvm.compiler.graph.iterators.NodeIterable;
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import org.graalvm.compiler.nodes.ConstantNode;
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import org.graalvm.compiler.nodes.FixedGuardNode;
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import org.graalvm.compiler.nodes.GuardNode;
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import org.graalvm.compiler.nodes.LogicNode;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
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import org.graalvm.compiler.nodes.calc.IntegerBelowNode;
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import org.graalvm.compiler.nodes.java.LoadIndexedNode;
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import org.graalvm.compiler.nodes.memory.FloatingReadNode;
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import org.graalvm.compiler.nodes.memory.ReadNode;
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import org.graalvm.compiler.nodes.spi.CoreProviders;
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import org.graalvm.compiler.nodes.spi.LoweringTool;
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import org.graalvm.compiler.phases.common.CanonicalizerPhase;
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import org.graalvm.compiler.phases.common.FloatingReadPhase;
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import org.graalvm.compiler.phases.common.IterativeConditionalEliminationPhase;
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import org.graalvm.compiler.phases.common.LoweringPhase;
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import org.junit.Assert;
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import org.junit.Test;
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import jdk.vm.ci.meta.DeoptimizationReason;
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/**
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* Check that multiple bounds checks are correctly grouped together.
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*/
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public class ConditionalEliminationTest14 extends ConditionalEliminationTestBase {
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public static void test1Snippet(Object[] args) {
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Object a5 = args[5];
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Object a7 = args[7];
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Object a6 = args[6];
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/*
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* The order of the conditions matters: The scheduler processes the floating reads for the
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* array loads in the order of the conditions here, and we want the index 7 access to be
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* processed before the index 6 access.
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*/
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if (a5 != null && a7 != null && a6 != null) {
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sink1 = 1;
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}
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sink0 = 0;
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}
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@Test
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public void test1() {
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StructuredGraph graph = parseEager("test1Snippet", AllowAssumptions.YES);
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CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
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CoreProviders context = getProviders();
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/* Convert the LoadIndexNode to ReadNode with floating guards. */
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new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
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/* Convert the ReadNode to FloatingReadNode. */
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new FloatingReadPhase().apply(graph);
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/* Apply the phase that we want to test. */
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new IterativeConditionalEliminationPhase(canonicalizer, true).apply(graph, context);
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Assert.assertEquals("All guards must be floating", 0, graph.getNodes(FixedGuardNode.TYPE).count());
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Assert.assertEquals("All array accesses must have been lowered", 0, graph.getNodes().filter(LoadIndexedNode.class).count());
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Assert.assertEquals("All reads must be floating", 0, graph.getNodes().filter(ReadNode.class).count());
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Assert.assertEquals("Must have floating reads (3 array accesses, 1 array length)", 4, graph.getNodes().filter(FloatingReadNode.class).count());
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NodeIterable<GuardNode> boundsChecks = graph.getNodes(GuardNode.TYPE).filter(n -> ((GuardNode) n).getReason() == DeoptimizationReason.BoundsCheckException);
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Assert.assertEquals("Must have only 1 bounds check remaining", 1, boundsChecks.count());
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LogicNode condition = boundsChecks.first().getCondition();
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Assert.assertTrue("Bounds check must check for array length 8", condition instanceof IntegerBelowNode && ((IntegerBelowNode) condition).getY().valueEquals(ConstantNode.forInt(8)));
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}
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}
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