Ilya Gorbunov
67 lines
1.9 KiB
Kotlin
67 lines
1.9 KiB
Kotlin
/*
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* Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package kotlin.js
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internal typealias BitMask = IntArray
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private fun bitMaskWith(activeBit: Int): BitMask {
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val numberIndex = activeBit shr 5
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val intArray = IntArray(numberIndex + 1)
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val positionInNumber = activeBit and 31
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val numberWithSettledBit = 1 shl positionInNumber
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intArray[numberIndex] = intArray[numberIndex] or numberWithSettledBit
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return intArray
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}
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internal fun BitMask.isBitSet(possibleActiveBit: Int): Boolean {
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val numberIndex = possibleActiveBit shr 5
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if (numberIndex > size) return false
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val positionInNumber = possibleActiveBit and 31
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val numberWithSettledBit = 1 shl positionInNumber
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return get(numberIndex) and numberWithSettledBit != 0
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}
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private fun compositeBitMask(capacity: Int, masks: Array<BitMask>): BitMask {
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return IntArray(capacity) { i ->
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var result = 0
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for (mask in masks) {
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if (i < mask.size) {
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result = result or mask[i]
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}
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}
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result
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}
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}
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internal fun implement(interfaces: Array<dynamic>): BitMask {
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var maxSize = 1
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val masks = js("[]")
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for (i in interfaces) {
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var currentSize = maxSize
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val imask: BitMask? = i.prototype.`$imask$` ?: i.`$imask$`
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if (imask != null) {
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masks.push(imask)
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currentSize = imask.size
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}
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val iid: Int? = i.`$metadata$`.iid
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val iidImask: BitMask? = iid?.let { bitMaskWith(it) }
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if (iidImask != null) {
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masks.push(iidImask)
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currentSize = JsMath.max(currentSize, iidImask.size)
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}
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if (currentSize > maxSize) {
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maxSize = currentSize
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}
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}
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return compositeBitMask(maxSize, masks)
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}
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