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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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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.Errors;
import com.oracle.truffle.js.runtime.JSConfig;

import java.util.Set;

@NodeInfo(shortName = "<<")
public abstract class JSLeftShiftNode extends JSBinaryNode {

    protected JSLeftShiftNode(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 JSLeftShiftConstantNode.create(left, right);
        }
        return JSLeftShiftNodeGen.create(left, right);
    }

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

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

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

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

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

    @Specialization
    protected BigInt doBigInt(BigInt a, BigInt b) {
        if (b.compareTo(BigInt.MAX_INT) < 0) {
            if (b.compareTo(BigInt.MIN_INT) > 0) {
                try {
                    return a.shiftLeft(b.intValue());
                } catch (ArithmeticException ae) {
                    throw Errors.createRangeErrorBigIntMaxSizeExceeded();
                }
            } else {
                return a.signum() < 0 ? BigInt.NEGATIVE_ONE : BigInt.ZERO;
            }
        } else {
            throw Errors.createRangeErrorBigIntMaxSizeExceeded();
        }
    }

    @Specialization(replaces = {"doInteger", "doIntegerDouble", "doDouble", "doBigInt"})
    protected Object doGeneric(Object a, Object b,
                    @Cached("create()") JSLeftShiftNode leftShift,
                    @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 leftShift.executeObject(operandA, operandB);
    }

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

    public static JSLeftShiftNode create() {
        return JSLeftShiftNodeGen.create(null, null);
    }

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