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 * The Universal Permissive License (UPL), Version 1.0
 *
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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
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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.array;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.builtins.JSArrayBufferObject;
import com.oracle.truffle.js.runtime.builtins.JSDataView;
import com.oracle.truffle.js.runtime.builtins.JSDataViewObject;

/**
 * Gets the byteLength of a DataView. Specializes on the type of the underlying ArrayBuffer.
 */
@ImportStatic({JSDataView.class})
public abstract class GetViewByteLengthNode extends JavaScriptBaseNode {

    public abstract int execute(JSDataViewObject typedArrayObj, JSContext context);

    @Specialization(guards = {"!isOutOfBounds(dataView, context)", "!dataView.hasAutoLength()"})
    protected static int doFixedLength(JSDataViewObject dataView, JSContext context) {
        assert !JSDataView.isOutOfBounds(dataView, context);
        return dataView.getLengthFixed();
    }

    @Specialization(guards = {"!isOutOfBounds(dataView, context)", "dataView.hasAutoLength()"})
    protected final int doAutoLength(JSDataViewObject dataView, JSContext context,
                    @Cached ArrayBufferByteLengthNode getByteLengthNode) {
        assert !JSDataView.isOutOfBounds(dataView, context);
        JSArrayBufferObject arrayBuffer = dataView.getArrayBuffer();
        int byteLength = getByteLengthNode.execute(this, arrayBuffer, context);
        int byteOffset = dataView.getOffset();
        return (byteLength - byteOffset);
    }

    @SuppressWarnings("unused")
    @Specialization(guards = {"isOutOfBounds(dataView, context)"})
    protected static int doOutOfBounds(JSDataViewObject dataView, JSContext context) {
        return 0;
    }

    @NeverDefault
    public static GetViewByteLengthNode create() {
        return GetViewByteLengthNodeGen.create();
    }
}