com.oracle.truffle.js.nodes.cast.LongToIntOrDoubleNode Maven / Gradle / Ivy

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/*
 * Copyright (c) 2023, 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
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 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
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package com.oracle.truffle.js.nodes.cast;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateInline;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.profiles.InlinedBranchProfile;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.runtime.JSRuntime;

/**
 * @see JSRuntime#longToIntOrDouble(long)
 */
@GenerateInline
@GenerateUncached
public abstract class LongToIntOrDoubleNode extends JavaScriptBaseNode {

    public abstract Number execute(Node node, long longValue);

    /**
     * To be used with non-negative integers that are known to be in the safe integer range, like
     * those that come from ToIndex or ToLength.
     */
    public final Number fromIndex(Node node, long index) {
        assert JSRuntime.isIntegerIndex(index) : index;
        return execute(node, index);
    }

    @Specialization
    protected static Number toIntOrDouble(Node node, long value,
                    @Cached InlinedBranchProfile toDoubleBranch) {
        if (CompilerDirectives.injectBranchProbability(CompilerDirectives.LIKELY_PROBABILITY, JSRuntime.longIsRepresentableAsInt(value))) {
            return (int) value;
        } else {
            toDoubleBranch.enter(node);
            return (double) value;
        }
    }

    @NeverDefault
    public static LongToIntOrDoubleNode create() {
        return LongToIntOrDoubleNodeGen.create();
    }
}