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The GraalVM compiler and the Graal-truffle optimizer.
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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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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).
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package jdk.graal.compiler.hotspot.amd64;

import static jdk.vm.ci.code.ValueUtil.asRegister;
import static jdk.graal.compiler.lir.LIRInstruction.OperandFlag.COMPOSITE;
import static jdk.graal.compiler.lir.LIRInstruction.OperandFlag.REG;

import jdk.graal.compiler.asm.Label;
import jdk.graal.compiler.asm.amd64.AMD64MacroAssembler;
import jdk.graal.compiler.core.common.spi.ForeignCallLinkage;
import jdk.graal.compiler.hotspot.GraalHotSpotVMConfig;
import jdk.graal.compiler.lir.LIRInstructionClass;
import jdk.graal.compiler.lir.amd64.AMD64AddressValue;
import jdk.graal.compiler.lir.amd64.AMD64LIRInstruction;
import jdk.graal.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.AllocatableValue;

/**
 * Base class for LIR ops that require a read barrier. This ensures the Def/Alive restrictions for
 * safe register allocation are met by any subclass.
 */
public abstract class AMD64HotSpotZBarrieredOp extends AMD64LIRInstruction {
    public static final LIRInstructionClass TYPE = LIRInstructionClass.create(AMD64HotSpotZBarrieredOp.class);

    @Def({REG}) protected AllocatableValue result;
    @Alive({COMPOSITE}) protected AMD64AddressValue loadAddress;

    protected final GraalHotSpotVMConfig config;
    protected final ForeignCallLinkage callTarget;

    protected AMD64HotSpotZBarrieredOp(LIRInstructionClass type, AllocatableValue result, AMD64AddressValue loadAddress, GraalHotSpotVMConfig config,
                    ForeignCallLinkage callTarget) {
        super(type);
        this.result = result;
        this.loadAddress = loadAddress;
        this.config = config;
        this.callTarget = callTarget;
    }

    /**
     * Emit a barrier testing a specific register.
     */
    protected void emitBarrier(CompilationResultBuilder crb, AMD64MacroAssembler masm, Register register, Label success) {
        AMD64HotSpotZBarrierSetLIRGenerator.emitBarrier(crb, masm, success, register, config, callTarget, loadAddress.toAddress(), this, null);
    }

    /**
     * Emit a barrier testing the {@code result} register.
     */
    protected void emitBarrier(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
        emitBarrier(crb, masm, asRegister(result), null);
    }
}