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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
 * 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
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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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 * 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.Truncatable;
import com.oracle.truffle.js.nodes.access.JSConstantNode.JSConstantIntegerNode;
import com.oracle.truffle.js.nodes.cast.JSToInt32Node;
import com.oracle.truffle.js.nodes.cast.JSToNumericNode;
import com.oracle.truffle.js.nodes.cast.JSToUInt32Node;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.JSConfig;

import java.util.Set;

11.7.2 The Signed Right Shift Operator ( >> ).
/**
 * 11.7.2 The Signed Right Shift Operator ( >> ).
 */
@NodeInfo(shortName = ">>")
public abstract class JSRightShiftNode extends JSBinaryNode {

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

    public static JavaScriptNode create(JavaScriptNode left, JavaScriptNode right) {
        Truncatable.truncate(left);
        Truncatable.truncate(right);
        if (JSConfig.UseSuperOperations && (right instanceof JSConstantIntegerNode)) {
            return JSRightShiftConstantNode.create(left, right);
        }
        return JSRightShiftNodeGen.create(left, right);
    }

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

    @Specialization
    protected int doInteger(int a, int b) {
        return a >> b;
    }

    @Specialization
    protected BigInt doBigInt(BigInt a, BigInt b,
                    @Cached("create()") JSLeftShiftNode leftShift) {
        return leftShift.doBigInt(a, b.negate());
    }

    @Specialization(guards = "!largerThan2e32(b)")
    protected int doIntDouble(int a, double b) {
        return a >> (int) ((long) b);
    }

    @Specialization
    protected Object doDouble(double a, double b,
                    @Cached("create()") JSRightShiftNode rightShift,
                    @Cached("create()") JSToInt32Node leftInt32,
                    @Cached("create()") JSToUInt32Node rightUInt32) {

        return rightShift.execute(leftInt32.executeInt(a), rightUInt32.execute(b));
    }

    @Specialization(replaces = {"doInteger", "doIntDouble", "doDouble", "doBigInt"})
    protected Object doGeneric(Object a, Object b,
                    @Cached("create()") JSRightShiftNode rightShift,
                    @Cached("create()") JSToNumericNode leftToNumeric,
                    @Cached("create()") JSToNumericNode rightToNumeric,
                    @Cached("create()") BranchProfile mixedNumericTypes) {
        Object operandA = leftToNumeric.execute(a);
        Object operandB = rightToNumeric.execute(b);
        ensureBothSameNumericType(operandA, operandB, mixedNumericTypes);
        return rightShift.execute(operandA, operandB);
    }

    public static JSRightShiftNode create() {
        return JSRightShiftNodeGen.create(null, null);
    }

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

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