/*

 * 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.

 *

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package org.graalvm.compiler.hotspot.amd64;

import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC;

import static jdk.vm.ci.code.ValueUtil.asRegister;

import jdk.vm.ci.amd64.AMD64Kind;

import jdk.vm.ci.code.Register;

import jdk.vm.ci.meta.AllocatableValue;

import org.graalvm.compiler.asm.amd64.AMD64Address;

import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;

import org.graalvm.compiler.debug.GraalError;

import org.graalvm.compiler.lir.LIRInstructionClass;

import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;

import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

public final class AMD64HotSpotLoadConfigValueOp extends AMD64LIRInstruction {

    public static final LIRInstructionClass<AMD64HotSpotLoadConfigValueOp> TYPE = LIRInstructionClass.create(AMD64HotSpotLoadConfigValueOp.class);

    @Def({OperandFlag.REG}) protected AllocatableValue result;

    private final int markId;

    public AMD64HotSpotLoadConfigValueOp(int markId, AllocatableValue result) {

        super(TYPE);

        this.result = result;

        this.markId = markId;

    }

    @Override

    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

        if (GeneratePIC.getValue(crb.getOptions())) {

            AMD64Kind kind = (AMD64Kind) result.getPlatformKind();

            Register reg = asRegister(result);

            AMD64Address placeholder = masm.getPlaceholder(-1);

            switch (kind) {

                case BYTE:

                    masm.movsbl(reg, placeholder);

                    break;

                case WORD:

                    masm.movswl(reg, placeholder);

                    break;

                case DWORD:

                    masm.movl(reg, placeholder);

                    break;

                case QWORD:

                    masm.movq(reg, placeholder);

                    break;

                default:

                    throw GraalError.unimplemented();

            }

        } else {

            throw GraalError.unimplemented();

        }

        crb.recordMark(markId);

    }

}