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 *

 * This code is free software; you can redistribute it and/or modify it

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 * 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,

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package org.graalvm.compiler.lir.jtt;

import static org.graalvm.compiler.lir.LIRValueUtil.asJavaConstant;

import static org.graalvm.compiler.lir.LIRValueUtil.isJavaConstant;

import org.junit.Before;

import org.junit.Test;

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

import org.graalvm.compiler.debug.GraalError;

import org.graalvm.compiler.lir.ConstantValue;

import org.graalvm.compiler.lir.VirtualStackSlot;

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

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

import jdk.vm.ci.meta.JavaConstant;

import jdk.vm.ci.meta.JavaKind;

import jdk.vm.ci.meta.PlatformKind;

import jdk.vm.ci.meta.Value;

/**

 * Tests move from a constant to a wider stack slot (e.g. byte constant to integer stack slot).

 */

public class ConstantStackCastTest extends LIRTest {

    private static PlatformKind byteKind;

    private static final LoadConstantStackSpec stackCopyByte = new LoadConstantStackSpec();

    @Before

    public void setup() {

        // Necessary to get the PlatformKind on which we're currently running on

        byteKind = getBackend().getTarget().arch.getPlatformKind(JavaKind.Byte);

        stackCopyByte.dstKind = LIRKind.fromJavaKind(getBackend().getTarget().arch, JavaKind.Int);

        stackCopyByte.srcKind = LIRKind.fromJavaKind(getBackend().getTarget().arch, JavaKind.Byte);

    }

    private static class LoadConstantStackSpec extends LIRTestSpecification {

        LIRKind dstKind;

        LIRKind srcKind;

        @Override

        public void generate(LIRGeneratorTool gen, Value value) {

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

            // create slots

            VirtualStackSlot s1 = frameMapBuilder.allocateSpillSlot(dstKind);

            // move stuff around

            Value srcValue;

            if (isJavaConstant(value)) {

                srcValue = getConstant(srcKind, asJavaConstant(value));

            } else {

                srcValue = value;

            }

            gen.emitMove(s1, srcValue);

            gen.emitBlackhole(s1);

            setResult(gen.emitMove(s1));

        }

        private static ConstantValue getConstant(LIRKind srcKind, JavaConstant c) {

            if (srcKind.getPlatformKind() == byteKind) {

                JavaConstant byteConst = JavaConstant.forByte((byte) c.asInt());

                return new ConstantValue(srcKind, byteConst);

            } else {

                throw GraalError.shouldNotReachHere("Kind not supported: " + srcKind);

            }

        }

    }

    @LIRIntrinsic

    public static byte testCopyByte(@SuppressWarnings("unused") LoadConstantStackSpec spec, byte value) {

        return value;

    }

    public byte testByte(byte value) {

        return testCopyByte(stackCopyByte, value);

    }

    @Test

        runTest("testByte", (byte) 0);

    }

}