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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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package jdk.graal.compiler.lir.alloc.lsra.ssa;

import jdk.graal.compiler.core.common.alloc.RegisterAllocationConfig;
import jdk.graal.compiler.core.common.cfg.BasicBlock;
import jdk.graal.compiler.debug.DebugContext;
import jdk.graal.compiler.lir.alloc.lsra.LinearScan;
import jdk.graal.compiler.lir.alloc.lsra.LinearScanEliminateSpillMovePhase;
import jdk.graal.compiler.lir.alloc.lsra.LinearScanLifetimeAnalysisPhase;
import jdk.graal.compiler.lir.alloc.lsra.LinearScanResolveDataFlowPhase;
import jdk.graal.compiler.lir.alloc.lsra.MoveResolver;
import jdk.graal.compiler.lir.gen.LIRGenerationResult;
import jdk.graal.compiler.lir.gen.MoveFactory;
import jdk.graal.compiler.lir.ssa.SSAUtil;

import jdk.vm.ci.code.TargetDescription;

public final class SSALinearScan extends LinearScan {

    public SSALinearScan(TargetDescription target, LIRGenerationResult res, MoveFactory spillMoveFactory, RegisterAllocationConfig regAllocConfig, int[] sortedBlocks,
                    boolean neverSpillConstants) {
        super(target, res, spillMoveFactory, regAllocConfig, sortedBlocks, neverSpillConstants);
    }

    @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 SSALinearScanResolveDataFlowPhase(this);
    }

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

    @Override
    @SuppressWarnings("try")
    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 (DebugContext.Scope s1 = debug.scope("Remove Phi In")) {
            for (int blockId : sortedBlocks()) {
                BasicBlock toBlock = getLIR().getBlockById(blockId);
                if (toBlock.getPredecessorCount() > 1) {
                    SSAUtil.removePhiIn(getLIR(), toBlock);
                }
            }
        }
    }

}