/*

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package org.graalvm.compiler.lir.alloc.lsra;

import org.graalvm.compiler.debug.Indent;

import org.graalvm.compiler.lir.gen.LIRGenerationResult;

import org.graalvm.compiler.lir.phases.AllocationPhase.AllocationContext;

import jdk.vm.ci.code.TargetDescription;

public final class LinearScanRegisterAllocationPhase extends LinearScanAllocationPhase {

    private final LinearScan allocator;

    LinearScanRegisterAllocationPhase(LinearScan allocator) {

        this.allocator = allocator;

    }

    @Override

    protected void run(TargetDescription target, LIRGenerationResult result, AllocationContext context) {

        allocator.printIntervals("Before register allocation");

        allocateRegisters();

        allocator.printIntervals("After register allocation");

    }

    @SuppressWarnings("try")

    void allocateRegisters() {

        try (Indent indent = allocator.getDebug().logAndIndent("allocate registers")) {

            Interval precoloredIntervals;

            Interval notPrecoloredIntervals;

            Pair<Interval, Interval> result = allocator.createUnhandledLists(LinearScan.IS_PRECOLORED_INTERVAL, LinearScan.IS_VARIABLE_INTERVAL);

            precoloredIntervals = result.getLeft();

            notPrecoloredIntervals = result.getRight();

            // allocate cpu registers

            LinearScanWalker lsw;

            if (OptimizingLinearScanWalker.Options.LSRAOptimization.getValue(allocator.getOptions())) {

                lsw = new OptimizingLinearScanWalker(allocator, precoloredIntervals, notPrecoloredIntervals);

            } else {

                lsw = new LinearScanWalker(allocator, precoloredIntervals, notPrecoloredIntervals);

            }

            lsw.walk();

            lsw.finishAllocation();

        }

    }

}