/*
 * Copyright (c) 2016, 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.common.spi;

import org.graalvm.compiler.options.OptionValues;

import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.ResolvedJavaField;

/**
 * Implements the logic that decides whether a field read should be constant folded.
 */
public interface ConstantFieldProvider {

    public interface ConstantFieldTool<T> {

        OptionValues getOptions();

        JavaConstant readValue();

        JavaConstant getReceiver();

        T foldConstant(JavaConstant ret);

        T foldStableArray(JavaConstant ret, int stableDimensions, boolean isDefaultStable);
    }

    /**
     * Decide whether a read from the {@code field} should be constant folded. This should return
     * {@link ConstantFieldTool#foldConstant} or {@link ConstantFieldTool#foldStableArray} if the
     * read should be constant folded, or {@code null} otherwise.
     */
    <T> T readConstantField(ResolvedJavaField field, ConstantFieldTool<T> tool);
}
