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 * This code is distributed in the hope that it will be useful, but WITHOUT

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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

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 *

 * 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,

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package org.graalvm.compiler.hotspot.lir.test;

import org.junit.Test;

import org.graalvm.compiler.core.common.LIRKind;

import org.graalvm.compiler.hotspot.HotSpotBackend;

import org.graalvm.compiler.lir.framemap.FrameMapBuilder;

import org.graalvm.compiler.lir.gen.LIRGeneratorTool;

import org.graalvm.compiler.lir.jtt.LIRTest;

import org.graalvm.compiler.lir.jtt.LIRTestSpecification;

import org.graalvm.compiler.nodes.SafepointNode;

import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderConfiguration;

import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;

import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin;

import jdk.vm.ci.code.BailoutException;

import jdk.vm.ci.meta.AllocatableValue;

import jdk.vm.ci.meta.JavaConstant;

import jdk.vm.ci.meta.ResolvedJavaMethod;

public class ExceedMaxOopMapStackOffset extends LIRTest {

    /**

     * Allocate lots of stacks slots and initialize them with a constant.

     */

    private static class WriteStackSlotsSpec extends LIRTestSpecification {

        private final JavaConstant constant;

        WriteStackSlotsSpec(JavaConstant constant) {

            this.constant = constant;

        }

        @Override

        public void generate(LIRGeneratorTool gen) {

            FrameMapBuilder frameMapBuilder = gen.getResult().getFrameMapBuilder();

            LIRKind lirKind = LIRKind.reference(gen.target().arch.getPlatformKind(constant.getJavaKind()));

            // create slots

            for (int i = 0; i < slots.length; i++) {

                AllocatableValue src = gen.emitLoadConstant(lirKind, constant);

                slots[i] = frameMapBuilder.allocateSpillSlot(lirKind);

                gen.emitMove(slots[i], src);

            }

        }

    }

    /**

     * Read stacks slots and move their content into a blackhole.

     */

    private static class ReadStackSlotsSpec extends LIRTestSpecification {

        ReadStackSlotsSpec() {

        }

        @Override

        public void generate(LIRGeneratorTool gen) {

            for (int i = 0; i < slots.length; i++) {

                gen.emitBlackhole(gen.emitMove(slots[i]));

            }

        }

    }

    @Override

    protected GraphBuilderConfiguration editGraphBuilderConfiguration(GraphBuilderConfiguration conf) {

        InvocationPlugin safepointPlugin = new InvocationPlugin() {

            @Override

            public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver) {

                b.add(new SafepointNode());

                return true;

            }

        };

        conf.getPlugins().getInvocationPlugins().register(safepointPlugin, getClass(), "safepoint");

        return super.editGraphBuilderConfiguration(conf);

    }

    /*

     * Safepoint Snippet

     */

    private static void safepoint() {

    }

    private static AllocatableValue[] slots;

    private static final LIRTestSpecification readStackObjects = new ReadStackSlotsSpec();

    @SuppressWarnings("unused")

    @LIRIntrinsic

    public static void instrinsic(LIRTestSpecification spec) {

    }

    private static final LIRTestSpecification writeStackObjects = new WriteStackSlotsSpec(JavaConstant.NULL_POINTER);

    public void testStackObjects() {

        instrinsic(writeStackObjects);

        safepoint();

        instrinsic(readStackObjects);

    }

    @Test

        int max = ((HotSpotBackend) getBackend()).getRuntime().getVMConfig().maxOopMapStackOffset;

        if (max == Integer.MAX_VALUE) {

            max = 16 * 1024 - 64;

        }

        try {

            int numSlots = (max / 8) + 1;

            slots = new AllocatableValue[numSlots];

            runTest("testStackObjects");

        } catch (BailoutException e) {

            return;

        }

        fail("Expected exception BailoutException wasn't thrown");

    }

}