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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

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 * 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

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package org.graalvm.compiler.core.test;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.debug.DebugDumpScope;

import org.graalvm.compiler.nodes.ParameterNode;

import org.graalvm.compiler.nodes.PiNode;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;

import org.graalvm.compiler.nodes.calc.IsNullNode;

import org.graalvm.compiler.nodes.memory.ReadNode;

import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode;

import org.graalvm.compiler.nodes.spi.CoreProviders;

import org.graalvm.compiler.nodes.spi.LoweringTool;

import org.graalvm.compiler.nodes.type.StampTool;

import org.graalvm.compiler.phases.common.CanonicalizerPhase;

import org.graalvm.compiler.phases.common.LoweringPhase;

import org.junit.Assert;

import org.junit.Ignore;

import org.junit.Test;

import jdk.vm.ci.meta.ResolvedJavaField;

import jdk.vm.ci.meta.ResolvedJavaType;

public class PushNodesThroughPiTest extends GraalCompilerTest {

    public static class A {

        public long x = 20;

    }

    public static class B extends A {

        public long y = 10;

    }

    public static class C extends B {

        public long z = 5;

    }

    public static long test1Snippet(A a) {

        C c = (C) a;

        long ret = c.x; // this can be pushed before the checkcast

        ret += c.y; // not allowed to push

        ret += c.z; // not allowed to push

        // the null-check should be canonicalized with the null-check of the checkcast

        ret += c != null ? 100 : 200;

        return ret;

    }

    @Ignore

    @Test

    @SuppressWarnings("try")

    public void test1() {

        final String snippet = "test1Snippet";

        DebugContext debug = getDebugContext();

        try (DebugContext.Scope s = debug.scope("PushThroughPi", new DebugDumpScope(snippet))) {

            StructuredGraph graph = compileTestSnippet(snippet);

            for (ReadNode rn : graph.getNodes().filter(ReadNode.class)) {

                OffsetAddressNode address = (OffsetAddressNode) rn.getAddress();

                long disp = address.getOffset().asJavaConstant().asLong();

                ResolvedJavaType receiverType = StampTool.typeOrNull(address.getBase());

                ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(disp, rn.getStackKind());

                assert field != null : "Node " + rn + " tries to access a field which doesn't exists for this type";

                if (field.getName().equals("x")) {

                    Assert.assertTrue(address.getBase() instanceof ParameterNode);

                } else {

                    Assert.assertTrue(address.getBase().toString(), address.getBase() instanceof PiNode);

                }

            }

            Assert.assertTrue(graph.getNodes().filter(IsNullNode.class).count() == 1);

        } catch (Throwable e) {

            throw debug.handle(e);

        }

    }

    private StructuredGraph compileTestSnippet(final String snippet) {

        StructuredGraph graph = parseEager(snippet, AllowAssumptions.NO);

        CoreProviders context = getProviders();

        CanonicalizerPhase canonicalizer = new CanonicalizerPhase();

        new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);

        canonicalizer.apply(graph, context);

        canonicalizer.apply(graph, context);

        return graph;

    }

}