/*
 * 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 com.oracle.graal.lir.alloc.lsra;

import com.oracle.graal.api.code.*;
import com.oracle.graal.compiler.common.alloc.*;
import com.oracle.graal.compiler.common.cfg.*;
import com.oracle.graal.lir.gen.*;
import com.oracle.graal.lir.gen.LIRGeneratorTool.SpillMoveFactory;
import com.oracle.graal.lir.ssa.*;
import com.oracle.jvmci.debug.*;
import com.oracle.jvmci.debug.Debug.Scope;

final class SSALinearScan extends LinearScan {

    SSALinearScan(TargetDescription target, LIRGenerationResult res, SpillMoveFactory spillMoveFactory, RegisterAllocationConfig regAllocConfig) {
        super(target, res, spillMoveFactory, regAllocConfig);
    }

    @Override
    protected MoveResolver createMoveResolver() {
        SSAMoveResolver moveResolver = new SSAMoveResolver(this);
        assert moveResolver.checkEmpty();
        return moveResolver;
    }

    @Override
    protected LinearScanLifetimeAnalysisPhase createLifetimeAnalysisPhase() {
        return new SSALinearScanLifetimeAnalysisPhase(this);
    }

    @Override
    protected LinearScanResolveDataFlowPhase createResolveDataFlowPhase() {
        return new SSALinarScanResolveDataFlowPhase(this);
    }

    @Override
    protected LinearScanEliminateSpillMovePhase createSpillMoveEliminationPhase() {
        return new SSALinearScanEliminateSpillMovePhase(this);
    }

    @Override
    protected void beforeSpillMoveElimination() {
        /*
         * PHI Ins are needed for the RegisterVerifier, otherwise PHIs where the Out and In value
         * matches (ie. there is no resolution move) are falsely detected as errors.
         */
        try (Scope s1 = Debug.scope("Remove Phi In")) {
            for (AbstractBlockBase<?> toBlock : sortedBlocks) {
                if (toBlock.getPredecessorCount() > 1) {
                    SSAUtils.removePhiIn(ir, toBlock);
                }
            }
        }
    }

}