hotspot/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot.aarch64/src/org/graalvm/compiler/hotspot/aarch64/AArch64HotSpotMoveFactory.java

/*
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 * 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.
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package org.graalvm.compiler.hotspot.aarch64;

import static jdk.vm.ci.hotspot.HotSpotCompressedNullConstant.COMPRESSED_NULL;
import static jdk.vm.ci.meta.JavaConstant.INT_0;
import static jdk.vm.ci.meta.JavaConstant.LONG_0;

import org.graalvm.compiler.core.aarch64.AArch64MoveFactory;
import org.graalvm.compiler.lir.LIRInstruction;

import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant;
import jdk.vm.ci.hotspot.HotSpotConstant;
import jdk.vm.ci.hotspot.HotSpotObjectConstant;
import jdk.vm.ci.meta.AllocatableValue;
import jdk.vm.ci.meta.Constant;
import jdk.vm.ci.meta.JavaConstant;

public class AArch64HotSpotMoveFactory extends AArch64MoveFactory {

    @Override
    public boolean canInlineConstant(JavaConstant c) {
        if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) {
            return true;
        } else if (c instanceof HotSpotObjectConstant) {
            return false;
        } else {
            return super.canInlineConstant(c);
        }
    }

    @Override
    public LIRInstruction createLoad(AllocatableValue dst, Constant src) {
        Constant usedSource;
        if (COMPRESSED_NULL.equals(src)) {
            usedSource = INT_0;
        } else if (src instanceof HotSpotObjectConstant && ((HotSpotObjectConstant) src).isNull()) {
            usedSource = LONG_0;
        } else {
            usedSource = src;
        }
        if (usedSource instanceof HotSpotConstant) {
            HotSpotConstant constant = (HotSpotConstant) usedSource;
            if (constant.isCompressed()) {
                return new AArch64HotSpotMove.LoadHotSpotObjectConstantInline(constant, dst);
            } else {
                // XXX Do we need the constant table?
                // return new SPARCHotSpotMove.LoadHotSpotObjectConstantFromTable(constant, dst,
                // constantTableBaseProvider.getConstantTableBase());
                return new AArch64HotSpotMove.LoadHotSpotObjectConstantInline(constant, dst);
            }
        } else {
            return super.createLoad(dst, usedSource);
        }
    }
}