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 * 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)
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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
 * one is included with the Software each a "Larger Work" to which the Software
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.js.nodes.binary;

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.NodeInfo;
import com.oracle.truffle.api.profiles.BranchProfile;
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 java.util.Set;

@NodeInfo(shortName = "%")
public abstract class JSModuloNode extends JSBinaryNode {

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

    public static JSModuloNode create(JavaScriptNode left, JavaScriptNode right) {
        return JSModuloNodeGen.create(left, right);
    }

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

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

    static boolean isPowOf2(int b) {
        return (b > 0) && (b & (b - 1)) == 0;
    }

    @Specialization(rewriteOn = ArithmeticException.class, guards = "isPowOf2(b)")
    protected int doIntPow2(int a, int b,
                    @Cached("create()") BranchProfile negativeBranch,
                    @Cached("create()") BranchProfile negativeZeroBranch) {
        int mask = b - 1;
        int result;
        if (a < 0) {
            negativeBranch.enter();
            result = -(-a & mask);
            if (result == 0) {
                negativeZeroBranch.enter();
                throw new ArithmeticException();
            }
        } else {
            result = a & mask;
        }
        return result;
    }

    @Specialization(rewriteOn = ArithmeticException.class, guards = "!isPowOf2(b)")
    protected int doInt(int a, int b,
                    @Cached("create()") BranchProfile specialBranch) {
        int result = a % b;
        if (result == 0) {
            specialBranch.enter();
            if (a < 0) {
                throw new ArithmeticException();
            }
        }
        return result;
    }

    @Specialization
    protected double doDouble(double a, double b) {
        return a % b;
    }

    @Specialization(guards = "isBigIntZero(b)")
    protected void doBigIntegerZeroDivision(@SuppressWarnings("unused") BigInt a, @SuppressWarnings("unused") BigInt b) {
        throw Errors.createRangeError("Remainder of zero division");
    }

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

    @Specialization(replaces = {"doInt", "doDouble", "doBigIntegerZeroDivision", "doBigInteger"})
    protected Object doGeneric(Object a, Object b,
                    @Cached("create()") JSModuloNode nestedModuloNode,
                    @Cached("create()") JSToNumericNode toNumeric1Node,
                    @Cached("create()") JSToNumericNode toNumeric2Node,
                    @Cached("create()") BranchProfile mixedNumericTypes) {
        Object operandA = toNumeric1Node.execute(a);
        Object operandB = toNumeric2Node.execute(b);
        ensureBothSameNumericType(operandA, operandB, mixedNumericTypes);
        return nestedModuloNode.execute(operandA, operandB);
    }

    @Override
    public boolean isResultAlwaysOfType(Class<?> clazz) {
        return clazz == Number.class;
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return JSModuloNodeGen.create(cloneUninitialized(getLeft(), materializedTags), cloneUninitialized(getRight(), materializedTags));
    }
}