001/*
002 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.compiler.test;
024
025import org.junit.*;
026
027import com.oracle.graal.api.directives.*;
028import com.oracle.graal.nodes.*;
029import com.oracle.graal.nodes.StructuredGraph.*;
030import com.oracle.graal.nodes.spi.*;
031import com.oracle.graal.phases.common.*;
032import com.oracle.graal.phases.tiers.*;
033
034/**
035 * This test checks the combined action of
036 * {@link com.oracle.graal.phases.common.DominatorConditionalEliminationPhase} and
037 * {@link com.oracle.graal.phases.common.LoweringPhase}. The lowering phase needs to introduce the
038 * null checks at the correct places for the dominator conditional elimination phase to pick them
039 * up.
040 */
041public class ConditionalEliminationTest10 extends ConditionalEliminationTestBase {
042
043    private static class TestClass {
044        int x;
045    }
046
047    @SuppressWarnings("all")
048    public static int testSnippet(int a, TestClass t) {
049        int result = 0;
050        if (a == 0) {
051            GraalDirectives.controlFlowAnchor();
052            result = t.x;
053        }
054        GraalDirectives.controlFlowAnchor();
055        return result + t.x;
056    }
057
058    @Test
059    public void test1() {
060        StructuredGraph graph = parseEager("testSnippet", AllowAssumptions.YES);
061        PhaseContext context = new PhaseContext(getProviders());
062        new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
063        Assert.assertEquals(2, graph.getNodes().filter(GuardNode.class).count());
064        new DominatorConditionalEliminationPhase(true).apply(graph, context);
065        Assert.assertEquals(1, graph.getNodes().filter(GuardNode.class).count());
066    }
067}