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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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 com.oracle.graal.compiler.target.amd64;

import java.util.*;

import com.oracle.graal.api.meta.*;
import com.oracle.graal.compiler.*;
import com.oracle.graal.lir.*;
import com.oracle.graal.lir.amd64.*;
import com.oracle.graal.lir.asm.*;
import com.oracle.max.asm.*;
import com.oracle.max.asm.target.amd64.*;
import com.oracle.max.cri.ci.*;

public class AMD64DeoptimizationStub extends AMD64Code {
    public final Label label = new Label();
    public final LIRDebugInfo info;
    public final CiDeoptAction action;
    public final RiDeoptReason reason;
    public final Object deoptInfo;

    public AMD64DeoptimizationStub(CiDeoptAction action, RiDeoptReason reason, LIRDebugInfo info, Object deoptInfo) {
        this.action = action;
        this.reason = reason;
        this.info = info;
        this.deoptInfo = deoptInfo;
    }

    private static ArrayList<Object> keepAlive = new ArrayList<>();

    @Override
    public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) {
        // TODO (cwimmer): we want to get rid of a generally reserved scratch register.
        CiRegister scratch = tasm.frameMap.registerConfig.getScratchRegister();

        masm.bind(label);
        if (GraalOptions.CreateDeoptInfo && deoptInfo != null) {
            masm.nop();
            keepAlive.add(deoptInfo.toString());
            AMD64Move.move(tasm, masm, scratch.asValue(), RiConstant.forObject(deoptInfo));
            // TODO Make this an explicit calling convention instead of using a scratch register
            AMD64Call.directCall(tasm, masm, CiRuntimeCall.SetDeoptInfo, info);
        }

        masm.movl(scratch, tasm.runtime.encodeDeoptActionAndReason(action, reason));
        // TODO Make this an explicit calling convention instead of using a scratch register
        AMD64Call.directCall(tasm, masm, CiRuntimeCall.Deoptimize, info);
        AMD64Call.shouldNotReachHere(tasm, masm);
    }

    @Override
    public String description() {
        return "deopt stub[reason=" + reason + ", action=" + action + "]";
    }
}