JDK14/Java14源码在线阅读

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 * Copyright (c) 2013, 2019, 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.core.phases;

import static org.graalvm.compiler.core.common.GraalOptions.LateMembars;
import static org.graalvm.compiler.phases.common.DeadCodeEliminationPhase.Optionality.Required;

import org.graalvm.compiler.core.common.GraalOptions;
import org.graalvm.compiler.nodes.spi.LoweringTool;
import org.graalvm.compiler.options.Option;
import org.graalvm.compiler.options.OptionKey;
import org.graalvm.compiler.options.OptionType;
import org.graalvm.compiler.options.OptionValues;
import org.graalvm.compiler.phases.common.CanonicalizerPhase;
import org.graalvm.compiler.phases.common.DeadCodeEliminationPhase;
import org.graalvm.compiler.phases.common.ExpandLogicPhase;
import org.graalvm.compiler.phases.common.FixReadsPhase;
import org.graalvm.compiler.phases.common.InsertMembarsPhase;
import org.graalvm.compiler.phases.common.LoweringPhase;
import org.graalvm.compiler.phases.common.ProfileCompiledMethodsPhase;
import org.graalvm.compiler.phases.common.PropagateDeoptimizeProbabilityPhase;
import org.graalvm.compiler.phases.common.UseTrappingNullChecksPhase;
import org.graalvm.compiler.phases.schedule.SchedulePhase;
import org.graalvm.compiler.phases.schedule.SchedulePhase.SchedulingStrategy;
import org.graalvm.compiler.phases.tiers.LowTierContext;

public class LowTier extends BaseTier<LowTierContext> {

    static class Options {

        // @formatter:off
        @Option(help = "", type = OptionType.Debug)
        public static final OptionKey<Boolean> ProfileCompiledMethods = new OptionKey<>(false);
        // @formatter:on

    }

    public LowTier(OptionValues options) {
        CanonicalizerPhase canonicalizer = createCanonicalizerPhase(options);
        CanonicalizerPhase canonicalizerWithoutGVN = canonicalizer.copyWithoutGVN();

        if (Options.ProfileCompiledMethods.getValue(options)) {
            appendPhase(new ProfileCompiledMethodsPhase());
        }

        appendPhase(new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.LOW_TIER));

        appendPhase(new ExpandLogicPhase());

        appendPhase(new FixReadsPhase(true,
                        new SchedulePhase(GraalOptions.StressTestEarlyReads.getValue(options) ? SchedulingStrategy.EARLIEST : SchedulingStrategy.LATEST_OUT_OF_LOOPS_IMPLICIT_NULL_CHECKS)));

        appendPhase(canonicalizerWithoutGVN);


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