/*
 * Copyright (c) 2015, 2015, 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.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package com.oracle.graal.compiler.test;

import org.junit.*;

import com.oracle.graal.nodes.*;
import com.oracle.graal.nodes.StructuredGraph.AllowAssumptions;
import com.oracle.graal.nodes.spi.*;
import com.oracle.graal.phases.common.*;
import com.oracle.graal.phases.schedule.*;
import com.oracle.graal.phases.tiers.*;
import com.oracle.jvmci.debug.*;

/**
 * Collection of tests for
 * {@link com.oracle.graal.phases.common.DominatorConditionalEliminationPhase} including those that
 * triggered bugs in this phase.
 */
public class ConditionalEliminationTestBase extends GraalCompilerTest {

    protected void testConditionalElimination(String snippet, String referenceSnippet) {
        testConditionalElimination(snippet, referenceSnippet, false);
    }

    protected void testConditionalElimination(String snippet, String referenceSnippet, boolean applyConditionalEliminationOnReference) {
        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
        Debug.dump(graph, "Graph");
        PhaseContext context = new PhaseContext(getProviders());
        CanonicalizerPhase canonicalizer1 = new CanonicalizerPhase();
        canonicalizer1.disableSimplification();
        canonicalizer1.apply(graph, context);
        new ConvertDeoptimizeToGuardPhase().apply(graph, context);
        CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
        new DominatorConditionalEliminationPhase(true).apply(graph, context);
        canonicalizer.apply(graph, context);
        canonicalizer.apply(graph, context);
        StructuredGraph referenceGraph = parseEager(referenceSnippet, AllowAssumptions.YES);
        if (applyConditionalEliminationOnReference) {
            new DominatorConditionalEliminationPhase(true).apply(referenceGraph, context);
            canonicalizer.apply(referenceGraph, context);
            canonicalizer.apply(referenceGraph, context);
        } else {
            canonicalizer.apply(referenceGraph, context);
        }
        assertEquals(referenceGraph, graph);
    }

    public void testProxies(String snippet, int expectedProxiesCreated) {
        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
        PhaseContext context = new PhaseContext(getProviders());
        CanonicalizerPhase canonicalizer1 = new CanonicalizerPhase();
        canonicalizer1.disableSimplification();
        canonicalizer1.apply(graph, context);
        CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
        new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
        canonicalizer.apply(graph, context);

        int baseProxyCount = graph.getNodes().filter(ProxyNode.class).count();
        new DominatorConditionalEliminationPhase(true).apply(graph, context);
        canonicalizer.apply(graph, context);
        new SchedulePhase().apply(graph, context);
        int actualProxiesCreated = graph.getNodes().filter(ProxyNode.class).count() - baseProxyCount;
        Assert.assertEquals(expectedProxiesCreated, actualProxiesCreated);
    }
}