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 * Copyright (c) 2015, 2015, 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 org.graalvm.compiler.asm.amd64.AMD64Address;

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

import org.graalvm.compiler.lir.LIRInstructionClass;

import org.graalvm.compiler.lir.LabelRef;

import org.graalvm.compiler.lir.SwitchStrategy;

import org.graalvm.compiler.lir.amd64.AMD64ControlFlow;

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

import jdk.vm.ci.code.Register;

import jdk.vm.ci.code.ValueUtil;

import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;

import jdk.vm.ci.meta.Constant;

import jdk.vm.ci.meta.Value;

final class AMD64HotSpotStrategySwitchOp extends AMD64ControlFlow.StrategySwitchOp {

    public static final LIRInstructionClass<AMD64HotSpotStrategySwitchOp> TYPE = LIRInstructionClass.create(AMD64HotSpotStrategySwitchOp.class);

    AMD64HotSpotStrategySwitchOp(SwitchStrategy strategy, LabelRef[] keyTargets, LabelRef defaultTarget, Value key, Value scratch) {

        super(TYPE, strategy, keyTargets, defaultTarget, key, scratch);

    }

    @Override

    public void emitCode(final CompilationResultBuilder crb, final AMD64MacroAssembler masm) {

        strategy.run(new HotSpotSwitchClosure(ValueUtil.asRegister(key), crb, masm));

    }

    public class HotSpotSwitchClosure extends SwitchClosure {

        protected HotSpotSwitchClosure(Register keyRegister, CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            super(keyRegister, crb, masm);

        }

        @Override

        protected void emitComparison(Constant c) {

            if (c instanceof HotSpotMetaspaceConstant) {

                HotSpotMetaspaceConstant meta = (HotSpotMetaspaceConstant) c;

                if (meta.isCompressed()) {

                    crb.recordInlineDataInCode(meta);

                    masm.cmpl(keyRegister, 0xDEADDEAD);

                } else {

                    AMD64Address addr = (AMD64Address) crb.recordDataReferenceInCode(meta, 8);

                    masm.cmpq(keyRegister, addr);

                }

            } else {

                super.emitComparison(c);

            }

        }

    }

}