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 * Copyright (c) 2015, 2018, 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 org.graalvm.compiler.core.aarch64;

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

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

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

import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;

import org.graalvm.compiler.core.common.type.DataPointerConstant;

import org.graalvm.compiler.debug.GraalError;

import org.graalvm.compiler.lir.LIRInstruction;

import org.graalvm.compiler.lir.aarch64.AArch64AddressValue;

import org.graalvm.compiler.lir.aarch64.AArch64LIRInstruction;

import org.graalvm.compiler.lir.aarch64.AArch64Move;

import org.graalvm.compiler.lir.aarch64.AArch64Move.LoadAddressOp;

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

import jdk.vm.ci.meta.AllocatableValue;

import jdk.vm.ci.meta.Constant;

import jdk.vm.ci.meta.JavaConstant;

import jdk.vm.ci.meta.Value;

public class AArch64MoveFactory implements MoveFactory {

    @Override

    public LIRInstruction createMove(AllocatableValue dst, Value src) {

        boolean srcIsSlot = isStackSlotValue(src);

        boolean dstIsSlot = isStackSlotValue(dst);

        if (isConstantValue(src)) {

            return createLoad(dst, asConstant(src));

        } else if (src instanceof AArch64AddressValue) {

            return new LoadAddressOp(dst, (AArch64AddressValue) src);

        } else {

            assert src instanceof AllocatableValue;

            if (srcIsSlot && dstIsSlot) {

                throw GraalError.shouldNotReachHere(src.getClass() + " " + dst.getClass());

            } else {

                return new AArch64Move.Move(dst, (AllocatableValue) src);

            }

        }

    }

    @Override

    public LIRInstruction createStackMove(AllocatableValue result, AllocatableValue input) {

        return new AArch64Move.Move(result, input);

    }

    @Override

    public AArch64LIRInstruction createLoad(AllocatableValue dst, Constant src) {

        if (src instanceof JavaConstant) {

            JavaConstant javaConstant = (JavaConstant) src;

            if (canInlineConstant(javaConstant)) {

                return new AArch64Move.LoadInlineConstant(javaConstant, dst);

            } else {

                // return new AArch64Move.LoadConstantFromTable(javaConstant,

                // constantTableBaseProvider.getConstantTableBase(), dst);

                return new AArch64Move.LoadInlineConstant(javaConstant, dst);

            }

        } else if (src instanceof DataPointerConstant) {

            return new AArch64Move.LoadDataOp(dst, (DataPointerConstant) src);

        } else {

            // throw GraalError.shouldNotReachHere(src.getClass().toString());

            throw GraalError.unimplemented();

        }

    }

    @Override

    public LIRInstruction createStackLoad(AllocatableValue result, Constant input) {

        return createLoad(result, input);

    }

    @Override

    public boolean canInlineConstant(Constant con) {

        if (con instanceof JavaConstant) {

            JavaConstant c = (JavaConstant) con;

            switch (c.getJavaKind()) {

                case Boolean:

                case Byte:

                case Char:

                case Short:

                case Int:

                    return AArch64MacroAssembler.isMovableImmediate(c.asInt());

                case Long:

                    return AArch64MacroAssembler.isMovableImmediate(c.asLong());

                case Object:

                    return c.isNull();

                default:

                    return false;

            }

        }

        return false;

    }

    @Override

    public boolean allowConstantToStackMove(Constant value) {

        return false;

    }

}