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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.CompilerAsserts;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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.JSConstantNumericUnitNode;
import com.oracle.truffle.js.nodes.cast.JSToNumericNode;
import com.oracle.truffle.js.runtime.BigInt;

import java.util.Set;

@NodeInfo(shortName = "-")
public abstract class JSSubtractNode extends JSBinaryNode implements Truncatable {

    @CompilationFinal boolean truncate;

    protected JSSubtractNode(boolean truncate, JavaScriptNode left, JavaScriptNode right) {
        super(left, right);
        this.truncate = truncate;
    }

    public static JavaScriptNode create(JavaScriptNode left, JavaScriptNode right, boolean truncate) {
        if (right instanceof JSConstantNumericUnitNode) {
            return JSAddSubNumericUnitNode.create(left, false, truncate);
        }
        return JSSubtractNodeGen.create(truncate, left, right);
    }

    public static JavaScriptNode create(JavaScriptNode left, JavaScriptNode right) {
        return create(left, right, false);
    }

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

    @Specialization(rewriteOn = ArithmeticException.class)
    protected int doInt(int a, int b) {
        if (truncate) {
            return a - b;
        } else {
            return Math.subtractExact(a, b);
        }
    }

    @Specialization(replaces = "doInt")
    protected double doDouble(double a, double b) {
        return a - b;
    }

    @Specialization()
    protected BigInt doBigInt(BigInt a, BigInt b) {
        return a.subtract(b);
    }

    @Specialization(replaces = {"doDouble", "doBigInt"})
    protected Object doGeneric(Object a, Object b,
                    @Cached("create()") JSToNumericNode toNumericA,
                    @Cached("create()") JSToNumericNode toNumericB,
                    @Cached("copyRecursive()") JavaScriptNode subtract,
                    @Cached("create()") BranchProfile mixedNumericTypes) {

        Object castA = toNumericA.execute(a);
        Object castB = toNumericB.execute(b);
        ensureBothSameNumericType(castA, castB, mixedNumericTypes);
        return ((JSSubtractNode) subtract).execute(castA, castB);
    }

    public final JavaScriptNode copyRecursive() {
        return create(null, null, truncate);
    }

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

    @Override
    public void setTruncate() {
        CompilerAsserts.neverPartOfCompilation();
        if (truncate == false) {
            truncate = true;
        }
    }

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