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The GraalVM compiler and the Graal-truffle optimizer.

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/*
 * Copyright (c) 2020, 2021, 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
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 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 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.nodes.spi;

import jdk.graal.compiler.nodes.StructuredGraph;
import jdk.graal.compiler.nodes.cfg.ControlFlowGraph;
import jdk.graal.compiler.nodes.loop.LoopsData;

/**
 * Provides capabilities for loop detection in a {@linkplain StructuredGraph}.
 */
public interface LoopsDataProvider {

    /**
     * Compute the {@link LoopsData} for this graph. This involves computing the
     * {@link ControlFlowGraph} for the {@link StructuredGraph} which is a costly operation. If a
     * callsites have a valid {@link ControlFlowGraph} in hand they should use
     * {@link #getLoopsData(ControlFlowGraph)}.
     */
    LoopsData getLoopsData(StructuredGraph graph);

    /**
     * @see LoopsDataProvider#getLoopsData(StructuredGraph)
     */
    LoopsData getLoopsData(ControlFlowGraph cfg);
}