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Shaded fat Jar for pkl-config-java, a Java config library based on the Pkl config language.
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 * person obtaining a copy of this software, associated documentation and/or
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 * (a) the Software, and
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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.ByteField;
import org.pkl.thirdparty.truffle.api.dsl.InlineSupport.InlineTarget;
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 certain properties of byte 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 ByteProfileNode extends Node {
 *
 *     abstract byte execute(byte input);
 *
 *     @Specialization
 *     byte doDefault(byte input, @Cached InlinedByteValueProfile profile) {
 *         byte profiledValue = profile.profile(this, input);
 *         // compiler may now see profiledValue as a partial evaluation constant
 *         return profiledValue;
 *     }
 * }
 * 
 *
 * @since 23.0
 */
public final class InlinedByteValueProfile extends AbstractInlinedValueProfile {

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

    private final ByteField cachedValue;

    private InlinedByteValueProfile() {
        super();
        this.cachedValue = null;
    }

    private InlinedByteValueProfile(InlineTarget target) {
        super(target);
        this.cachedValue = target.getPrimitive(1, ByteField.class);
    }

    /** @since 23.0 */
    public byte profile(Node node, byte value) {
        if (this.state != null) {
            int localState = this.state.get(node);
            if (localState != GENERIC) {
                if (localState == SPECIALIZED) {
                    byte v = this.cachedValue.get(node);
                    if (v == value) {
                        return v;
                    }
                }
                CompilerDirectives.transferToInterpreterAndInvalidate();
                if (localState == UNINITIALIZED) {
                    this.state.set(node, SPECIALIZED);
                    this.cachedValue.set(node, value);
                } else {
                    this.state.set(node, GENERIC);
                    this.cachedValue.set(node, (byte) 0);
                }
            }
        }
        return value;
    }

    byte 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(ByteValueProfile.class, isUninitialized(node), isGeneric(node), //
                        String.format("value == (byte)%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 InlinedByteValueProfile inline(
                    @RequiredField(value = StateField.class, bits = REQUIRED_STATE_BITS) //
                    @RequiredField(value = ByteField.class) InlineTarget target) {
        if (Profile.isProfilingEnabled()) {
            return new InlinedByteValueProfile(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 InlinedByteValueProfile getUncached() {
        return DISABLED;
    }

}