com.oracle.truffle.js.nodes.binary.JSDivideNode Maven / Gradle / Ivy

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 * 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
 * freely licensable by each licensor hereunder covering either (i) the
 * 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
 * either these or other terms.
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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.binary;

import java.util.Set;

import com.oracle.truffle.api.HostCompilerDirectives.InliningCutoff;
import com.oracle.truffle.api.dsl.Bind;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.profiles.InlinedBranchProfile;
import com.oracle.truffle.api.strings.TruffleString;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.cast.JSToNumericNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.Strings;

@NodeInfo(shortName = "/")
public abstract class JSDivideNode extends JSBinaryNode {

    protected JSDivideNode(JavaScriptNode left, JavaScriptNode right) {
        super(left, right);
    }

    public static JSDivideNode create(JavaScriptNode left, JavaScriptNode right) {
        return JSDivideNodeGen.create(left, right);
    }

    public static JSDivideNode create() {
        return create(null, null);
    }

    public abstract Object execute(Object a, Object b);

    // otherwise, explicitly check for cornercase
    protected static boolean isCornercase(int a, int b) {
        return a != 0 && !(b == -1 && a == Integer.MIN_VALUE);
    }

    // when b is positive, the result will fit int (if without remainder)
    @Specialization(rewriteOn = ArithmeticException.class, guards = "b > 0")
    protected int doInt1(int a, int b) {
        if (a % b == 0) {
            return a / b;
        }
        throw new ArithmeticException();
    }

    // otherwise, ensure a > 0 (this also excludes two cornercases):
    // when a == 0, result would be NegativeZero
    // when a == Integer.MIN_VALUE && b == -1, result does not fit into int
    @Specialization(rewriteOn = ArithmeticException.class, guards = "a > 0")
    protected int doInt2(int a, int b) {
        return doInt1(a, b);
    }

    @Specialization(rewriteOn = ArithmeticException.class, guards = "isCornercase(a, b)")
    protected int doInt3(int a, int b) {
        return doInt1(a, b);
    }

    @Specialization(replaces = {"doInt1", "doInt2", "doInt3"})
    protected double doDouble(double a, double b) {
        return a / b;
    }

    @Specialization(guards = "isBigIntZero(b)")
    protected BigInt doBigIntZeroDivision(@SuppressWarnings("unused") BigInt a, @SuppressWarnings("unused") BigInt b) {
        throw Errors.createRangeError("Division by zero");
    }

    @Specialization(guards = "!isBigIntZero(b)")
    protected BigInt doBigInt(BigInt a, BigInt b) {
        return a.divide(b);
    }

    @InliningCutoff
    @Specialization(guards = {"hasOverloadedOperators(a) || hasOverloadedOperators(b)"})
    protected Object doOverloaded(Object a, Object b,
                    @Cached("createNumeric(getOverloadedOperatorName())") JSOverloadedBinaryNode overloadedOperatorNode) {
        return overloadedOperatorNode.execute(a, b);
    }

    protected TruffleString getOverloadedOperatorName() {
        return Strings.SLASH;
    }

    @Specialization(guards = {"!hasOverloadedOperators(a)", "!hasOverloadedOperators(b)"}, replaces = "doDouble")
    protected static Object doGeneric(Object a, Object b,
                    @Bind("this") Node node,
                    @Cached JSDivideNode nestedDivideNode,
                    @Cached JSToNumericNode toNumeric1Node,
                    @Cached JSToNumericNode toNumeric2Node,
                    @Cached InlinedBranchProfile mixedNumericTypes) {
        Object numericA = toNumeric1Node.execute(a);
        Object numericB = toNumeric2Node.execute(b);
        ensureBothSameNumericType(numericA, numericB, node, mixedNumericTypes);
        return nestedDivideNode.execute(numericA, numericB);
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set> materializedTags) {
        return JSDivideNodeGen.create(cloneUninitialized(getLeft(), materializedTags), cloneUninitialized(getRight(), materializedTags));
    }
}