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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package org.pkl.thirdparty.truffle.api.profiles;

import org.pkl.thirdparty.truffle.api.CompilerDirectives;
import org.pkl.thirdparty.truffle.api.dsl.InlineSupport.InlineTarget;
import org.pkl.thirdparty.truffle.api.dsl.InlineSupport.ReferenceField;
import org.pkl.thirdparty.truffle.api.dsl.InlineSupport.RequiredField;
import org.pkl.thirdparty.truffle.api.dsl.InlineSupport.StateField;
import org.pkl.thirdparty.truffle.api.nodes.Node;

/**
 * Specialized value profile to capture the exact class of reference runtime values.
 * Value profiles require a runtime check in their initialized state to verify their profiled
 * assumption. Value profiles are limited to capture monomorphic profiles only. This means that if
 * two or more values are profiled within a single profile then the profile has no effect. If the
 * value assumption is invalidated in compiled code then it is invalidated.
 *
 * 
 *  Usage example: 
 *
 * 
 * abstract class ReferenceProfileNode extends Node {
 *
 *     abstract Object execute(Object input);
 *
 *     @Specialization
 *     Object doDefault(Object input, @Cached InlinedExactClassProfile profile) {
 *         Object profiledValue = profile.profile(this, input);
 *         // compiler may now see the exact class as a partial evaluation constant
 *         return profiledValue;
 *     }
 * }
 * 
 *
 * @since 23.0
 */
public final class InlinedExactClassProfile extends AbstractInlinedValueProfile {

    private static final InlinedExactClassProfile DISABLED;
    static {
        InlinedExactClassProfile profile = new InlinedExactClassProfile();
        DISABLED = profile;
    }

    private final ReferenceField> cachedValue;

    private InlinedExactClassProfile() {
        this.cachedValue = null;
    }

    private InlinedExactClassProfile(InlineTarget target) {
        super(target);
        this.cachedValue = target.getReference(1, Class.class);
    }

    /** @since 23.0 */
    @SuppressWarnings("unchecked")
    public  T profile(Node node, T value) {
        if (state != null) {
            int localState = this.state.get(node);
            if (localState != GENERIC) {
                if (localState == SPECIALIZED && value != null) {
                    Class c = cachedValue.get(node);
                    if (c != null) {
                        if (CompilerDirectives.inCompiledCode()) {
                            if (CompilerDirectives.isExact(value, c)) {
                                return (T) CompilerDirectives.castExact(value, c);
                            }
                        } else {
                            if (value.getClass() == c) {
                                return value;
                            }
                        }
                    }
                }
                CompilerDirectives.transferToInterpreterAndInvalidate();
                if (localState == UNINITIALIZED && value != null) {
                    this.cachedValue.set(node, value.getClass());
                    this.state.set(node, SPECIALIZED);
                } else {
                    this.cachedValue.set(node, Object.class);
                    this.state.set(node, GENERIC);
                }
            }
        }
        return value;
    }

    Class getCachedValue(Node node) {
        return this.cachedValue.get(node);
    }

    /**
     * {@inheritDoc}
     *
     * @since 23.0
     */
    @Override
    public String toString(Node node) {
        if (state == null) {
            return toStringDisabled();
        }
        return toString(InlinedExactClassProfile.class, isUninitialized(node), isGeneric(node), //
                        String.format("value == %s", getCachedValue(node)));
    }

    /**
     * Returns an inlined version of the profile. This version is automatically used by Truffle DSL
     * node inlining.
     *
     * @since 23.0
     */
    public static InlinedExactClassProfile inline(
                    @RequiredField(value = StateField.class, bits = REQUIRED_STATE_BITS) //
                    @RequiredField(value = ReferenceField.class, type = Class.class) InlineTarget target) {
        if (Profile.isProfilingEnabled()) {
            return new InlinedExactClassProfile(target);
        } else {
            return getUncached();
        }
    }

    /**
     * Returns the uncached version of the profile. The uncached version of a profile does not
     * perform any profiling.
     *
     * @since 23.0
     */
    public static InlinedExactClassProfile getUncached() {
        return DISABLED;
    }

}