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scala.collection.immutable.Vector.scala Maven / Gradle / Ivy
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package collection
package immutable
import scala.annotation.unchecked.uncheckedVariance
import scala.collection.generic._
import scala.collection.mutable.{Builder, ReusableBuilder}
import scala.collection.parallel.immutable.ParVector
/** Companion object to the Vector class
*/
object Vector extends IndexedSeqFactory[Vector] {
def newBuilder[A]: Builder[A, Vector[A]] = new VectorBuilder[A]
implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, Vector[A]] =
ReusableCBF.asInstanceOf[GenericCanBuildFrom[A]]
private[immutable] val NIL = new Vector[Nothing](0, 0, 0)
override def empty[A]: Vector[A] = NIL
// Constants governing concat strategy for performance
private final val Log2ConcatFaster = 5
private final val TinyAppendFaster = 2
private val emptyIterator: VectorIterator[Nothing] = new VectorIterator[Nothing](0, 0)
}
// in principle, most members should be private. however, access privileges must
// be carefully chosen to not prevent method inlining
/** Vector is a general-purpose, immutable data structure. It provides random access and updates
* in effectively constant time, as well as very fast append and prepend. Because vectors strike
* a good balance between fast random selections and fast random functional updates, they are
* currently the default implementation of immutable indexed sequences. It is backed by a little
* endian bit-mapped vector trie with a branching factor of 32. Locality is very good, but not
* contiguous, which is good for very large sequences.
*
* $usesMutableState
*
* @see [[http://docs.scala-lang.org/overviews/collections/concrete-immutable-collection-classes.html#vectors "Scala's Collection Library overview"]]
* section on `Vectors` for more information.
*
* @tparam A the element type
*
* @define Coll `Vector`
* @define coll vector
* @define thatinfo the class of the returned collection. In the standard library configuration,
* `That` is always `Vector[B]` because an implicit of type `CanBuildFrom[Vector, B, That]`
* is defined in object `Vector`.
* @define bfinfo an implicit value of class `CanBuildFrom` which determines the
* result class `That` from the current representation type `Repr`
* and the new element type `B`. This is usually the `canBuildFrom` value
* defined in object `Vector`.
* @define orderDependent
* @define orderDependentFold
* @define mayNotTerminateInf
* @define willNotTerminateInf
*/
@SerialVersionUID(-1334388273712300479L)
final class Vector[+A] private[immutable] (private[collection] val startIndex: Int, private[collection] val endIndex: Int, focus: Int)
extends AbstractSeq[A]
with IndexedSeq[A]
with GenericTraversableTemplate[A, Vector]
with IndexedSeqLike[A, Vector[A]]
with VectorPointer[A @uncheckedVariance]
with Serializable
with CustomParallelizable[A, ParVector[A]]
{ self =>
override def companion: GenericCompanion[Vector] = Vector
private[immutable] var dirty = false
def length = endIndex - startIndex
override def par = new ParVector(this)
override def toVector: Vector[A] = this
override def lengthCompare(len: Int): Int = length - len
private[collection] final def initIterator[B >: A](s: VectorIterator[B]) {
s.initFrom(this)
if (dirty) s.stabilize(focus)
if (s.depth > 1) s.gotoPos(startIndex, startIndex ^ focus)
}
override def iterator: VectorIterator[A] = {
if (length == 0) Vector.emptyIterator
else {
val s = new VectorIterator[A](startIndex, endIndex)
initIterator(s)
s
}
}
override /*SeqLike*/
def reverseIterator: Iterator[A] = new AbstractIterator[A] {
private var i = self.length
def hasNext: Boolean = 0 < i
def next(): A =
if (0 < i) {
i -= 1
self(i)
} else Iterator.empty.next()
}
// Ideally, clients will inline calls to map all the way down, including the iterator/builder methods.
// In principle, escape analysis could even remove the iterator/builder allocations and do it
// with local variables exclusively. But we're not quite there yet ...
def apply(index: Int): A = {
val idx = checkRangeConvert(index)
getElem(idx, idx ^ focus)
}
private def checkRangeConvert(index: Int) = {
val idx = index + startIndex
if (index >= 0 && idx < endIndex)
idx
else
throw new IndexOutOfBoundsException(index.toString)
}
// If we have a default builder, there are faster ways to perform some operations
@inline private[this] def isDefaultCBF[A, B, That](bf: CanBuildFrom[Vector[A], B, That]): Boolean =
(bf eq immutable.Vector.ReusableCBF) ||
(bf eq immutable.IndexedSeq.ReusableCBF) || (bf eq collection.IndexedSeq.ReusableCBF) ||
(bf eq immutable.Seq.ReusableCBF) || (bf eq collection.Seq.ReusableCBF)
// SeqLike api
override def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That =
if (isDefaultCBF[A, B, That](bf))
updateAt(index, elem).asInstanceOf[That] // ignore bf--it will just give a Vector, and slowly
else super.updated(index, elem)(bf)
override def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That =
if (isDefaultCBF[A, B, That](bf))
appendFront(elem).asInstanceOf[That] // ignore bf--it will just give a Vector, and slowly
else super.+:(elem)(bf)
override def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Vector[A], B, That]): That =
if (isDefaultCBF(bf))
appendBack(elem).asInstanceOf[That] // ignore bf--it will just give a Vector, and slowly
else super.:+(elem)(bf)
override def take(n: Int): Vector[A] = {
if (n <= 0)
Vector.empty
else if (startIndex < endIndex - n)
dropBack0(startIndex + n)
else
this
}
override def drop(n: Int): Vector[A] = {
if (n <= 0)
this
else if (startIndex < endIndex - n)
dropFront0(startIndex + n)
else
Vector.empty
}
override def takeRight(n: Int): Vector[A] = {
if (n <= 0)
Vector.empty
else if (endIndex - n > startIndex)
dropFront0(endIndex - n)
else
this
}
override def dropRight(n: Int): Vector[A] = {
if (n <= 0)
this
else if (endIndex - n > startIndex)
dropBack0(endIndex - n)
else
Vector.empty
}
override /*IterableLike*/
def head: A = {
if (isEmpty) throw new UnsupportedOperationException("empty.head")
apply(0)
}
override /*TraversableLike*/
def tail: Vector[A] = {
if (isEmpty) throw new UnsupportedOperationException("empty.tail")
drop(1)
}
override /*TraversableLike*/
def last: A = {
if (isEmpty) throw new UnsupportedOperationException("empty.last")
apply(length - 1)
}
override /*TraversableLike*/
def init: Vector[A] = {
if (isEmpty) throw new UnsupportedOperationException("empty.init")
dropRight(1)
}
override /*IterableLike*/
def slice(from: Int, until: Int): Vector[A] =
take(until).drop(from)
override /*IterableLike*/
def splitAt(n: Int): (Vector[A], Vector[A]) = (take(n), drop(n))
// concat (suboptimal but avoids worst performance gotchas)
override def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Vector[A], B, That]): That = {
if (isDefaultCBF(bf)) {
// We are sure we will create a Vector, so let's do it efficiently
import Vector.{Log2ConcatFaster, TinyAppendFaster}
if (that.isEmpty) this.asInstanceOf[That]
else {
val again = if (!that.isTraversableAgain) that.toVector else that.seq
again.size match {
// Often it's better to append small numbers of elements (or prepend if RHS is a vector)
case n if n <= TinyAppendFaster || n < (this.size >>> Log2ConcatFaster) =>
var v: Vector[B] = this
for (x <- again) v = v :+ x
v.asInstanceOf[That]
case n if this.size < (n >>> Log2ConcatFaster) && again.isInstanceOf[Vector[_]] =>
var v = again.asInstanceOf[Vector[B]]
val ri = this.reverseIterator
while (ri.hasNext) v = ri.next +: v
v.asInstanceOf[That]
case _ => super.++(again)
}
}
}
else super.++(that.seq)
}
// semi-private api
private[immutable] def updateAt[B >: A](index: Int, elem: B): Vector[B] = {
val idx = checkRangeConvert(index)
val s = new Vector[B](startIndex, endIndex, idx)
s.initFrom(this)
s.dirty = dirty
s.gotoPosWritable(focus, idx, focus ^ idx) // if dirty commit changes; go to new pos and prepare for writing
s.display0(idx & 31) = elem.asInstanceOf[AnyRef]
s
}
private def gotoPosWritable(oldIndex: Int, newIndex: Int, xor: Int) = if (dirty) {
gotoPosWritable1(oldIndex, newIndex, xor)
} else {
gotoPosWritable0(newIndex, xor)
dirty = true
}
private def gotoFreshPosWritable(oldIndex: Int, newIndex: Int, xor: Int) = if (dirty) {
gotoFreshPosWritable1(oldIndex, newIndex, xor)
} else {
gotoFreshPosWritable0(oldIndex, newIndex, xor)
dirty = true
}
private[immutable] def appendFront[B >: A](value: B): Vector[B] = {
if (endIndex != startIndex) {
val blockIndex = (startIndex - 1) & ~31
val lo = (startIndex - 1) & 31
if (startIndex != blockIndex + 32) {
val s = new Vector(startIndex - 1, endIndex, blockIndex)
s.initFrom(this)
s.dirty = dirty
s.gotoPosWritable(focus, blockIndex, focus ^ blockIndex)
s.display0(lo) = value.asInstanceOf[AnyRef]
s
} else {
val freeSpace = (1 << (5 * depth)) - endIndex // free space at the right given the current tree-structure depth
val shift = freeSpace & ~((1 << (5 * (depth - 1))) - 1) // number of elements by which we'll shift right (only move at top level)
val shiftBlocks = freeSpace >>> (5 * (depth - 1)) // number of top-level blocks
if (shift != 0) {
// case A: we can shift right on the top level
if (depth > 1) {
val newBlockIndex = blockIndex + shift
val newFocus = focus + shift
val s = new Vector(startIndex - 1 + shift, endIndex + shift, newBlockIndex)
s.initFrom(this)
s.dirty = dirty
s.shiftTopLevel(0, shiftBlocks) // shift right by n blocks
s.gotoFreshPosWritable(newFocus, newBlockIndex, newFocus ^ newBlockIndex) // maybe create pos; prepare for writing
s.display0(lo) = value.asInstanceOf[AnyRef]
s
} else {
val newBlockIndex = blockIndex + 32
val newFocus = focus
val s = new Vector(startIndex - 1 + shift, endIndex + shift, newBlockIndex)
s.initFrom(this)
s.dirty = dirty
s.shiftTopLevel(0, shiftBlocks) // shift right by n elements
s.gotoPosWritable(newFocus, newBlockIndex, newFocus ^ newBlockIndex) // prepare for writing
s.display0(shift - 1) = value.asInstanceOf[AnyRef]
s
}
} else if (blockIndex < 0) {
// case B: we need to move the whole structure
val move = (1 << (5 * (depth + 1))) - (1 << (5 * depth))
val newBlockIndex = blockIndex + move
val newFocus = focus + move
val s = new Vector(startIndex - 1 + move, endIndex + move, newBlockIndex)
s.initFrom(this)
s.dirty = dirty
s.gotoFreshPosWritable(newFocus, newBlockIndex, newFocus ^ newBlockIndex) // could optimize: we know it will create a whole branch
s.display0(lo) = value.asInstanceOf[AnyRef]
s
} else {
val newBlockIndex = blockIndex
val newFocus = focus
val s = new Vector(startIndex - 1, endIndex, newBlockIndex)
s.initFrom(this)
s.dirty = dirty
s.gotoFreshPosWritable(newFocus, newBlockIndex, newFocus ^ newBlockIndex)
s.display0(lo) = value.asInstanceOf[AnyRef]
s
}
}
} else {
// empty vector, just insert single element at the back
val elems = new Array[AnyRef](32)
elems(31) = value.asInstanceOf[AnyRef]
val s = new Vector(31, 32, 0)
s.depth = 1
s.display0 = elems
s
}
}
private[immutable] def appendBack[B >: A](value: B): Vector[B] = {
if (endIndex != startIndex) {
val blockIndex = endIndex & ~31
val lo = endIndex & 31
if (endIndex != blockIndex) {
val s = new Vector(startIndex, endIndex + 1, blockIndex)
s.initFrom(this)
s.dirty = dirty
s.gotoPosWritable(focus, blockIndex, focus ^ blockIndex)
s.display0(lo) = value.asInstanceOf[AnyRef]
s
} else {
val shift = startIndex & ~((1 << (5 * (depth - 1))) - 1)
val shiftBlocks = startIndex >>> (5 * (depth - 1))
if (shift != 0) {
if (depth > 1) {
val newBlockIndex = blockIndex - shift
val newFocus = focus - shift
val s = new Vector(startIndex - shift, endIndex + 1 - shift, newBlockIndex)
s.initFrom(this)
s.dirty = dirty
s.shiftTopLevel(shiftBlocks, 0) // shift left by n blocks
s.gotoFreshPosWritable(newFocus, newBlockIndex, newFocus ^ newBlockIndex)
s.display0(lo) = value.asInstanceOf[AnyRef]
s
} else {
val newBlockIndex = blockIndex - 32
val newFocus = focus
val s = new Vector(startIndex - shift, endIndex + 1 - shift, newBlockIndex)
s.initFrom(this)
s.dirty = dirty
s.shiftTopLevel(shiftBlocks, 0) // shift right by n elements
s.gotoPosWritable(newFocus, newBlockIndex, newFocus ^ newBlockIndex)
s.display0(32 - shift) = value.asInstanceOf[AnyRef]
s
}
} else {
val newBlockIndex = blockIndex
val newFocus = focus
val s = new Vector(startIndex, endIndex + 1, newBlockIndex)
s.initFrom(this)
s.dirty = dirty
s.gotoFreshPosWritable(newFocus, newBlockIndex, newFocus ^ newBlockIndex)
s.display0(lo) = value.asInstanceOf[AnyRef]
s
}
}
} else {
val elems = new Array[AnyRef](32)
elems(0) = value.asInstanceOf[AnyRef]
val s = new Vector(0, 1, 0)
s.depth = 1
s.display0 = elems
s
}
}
// low-level implementation (needs cleanup, maybe move to util class)
private def shiftTopLevel(oldLeft: Int, newLeft: Int) = (depth - 1) match {
case 0 => display0 = copyRange(display0, oldLeft, newLeft)
case 1 => display1 = copyRange(display1, oldLeft, newLeft)
case 2 => display2 = copyRange(display2, oldLeft, newLeft)
case 3 => display3 = copyRange(display3, oldLeft, newLeft)
case 4 => display4 = copyRange(display4, oldLeft, newLeft)
case 5 => display5 = copyRange(display5, oldLeft, newLeft)
}
private def zeroLeft(array: Array[AnyRef], index: Int): Unit = {
var i = 0
while (i < index) {
array(i) = null
i += 1
}
}
private def zeroRight(array: Array[AnyRef], index: Int): Unit = {
var i = index
while (i < array.length) {
array(i) = null
i += 1
}
}
private def copyLeft(array: Array[AnyRef], right: Int): Array[AnyRef] = {
val copy = new Array[AnyRef](array.length)
java.lang.System.arraycopy(array, 0, copy, 0, right)
copy
}
private def copyRight(array: Array[AnyRef], left: Int): Array[AnyRef] = {
val copy = new Array[AnyRef](array.length)
java.lang.System.arraycopy(array, left, copy, left, copy.length - left)
copy
}
private def preClean(depth: Int) = {
this.depth = depth
(depth - 1) match {
case 0 =>
display1 = null
display2 = null
display3 = null
display4 = null
display5 = null
case 1 =>
display2 = null
display3 = null
display4 = null
display5 = null
case 2 =>
display3 = null
display4 = null
display5 = null
case 3 =>
display4 = null
display5 = null
case 4 =>
display5 = null
case 5 =>
}
}
// requires structure is at index cutIndex and writable at level 0
private def cleanLeftEdge(cutIndex: Int) = {
if (cutIndex < (1 << 5)) {
zeroLeft(display0, cutIndex)
} else if (cutIndex < (1 << 10)) {
zeroLeft(display0, cutIndex & 31)
display1 = copyRight(display1, cutIndex >>> 5)
} else if (cutIndex < (1 << 15)) {
zeroLeft(display0, cutIndex & 31)
display1 = copyRight(display1, (cutIndex >>> 5) & 31)
display2 = copyRight(display2, cutIndex >>> 10)
} else if (cutIndex < (1 << 20)) {
zeroLeft(display0, cutIndex & 31)
display1 = copyRight(display1, (cutIndex >>> 5) & 31)
display2 = copyRight(display2, (cutIndex >>> 10) & 31)
display3 = copyRight(display3, cutIndex >>> 15)
} else if (cutIndex < (1 << 25)) {
zeroLeft(display0, cutIndex & 31)
display1 = copyRight(display1, (cutIndex >>> 5) & 31)
display2 = copyRight(display2, (cutIndex >>> 10) & 31)
display3 = copyRight(display3, (cutIndex >>> 15) & 31)
display4 = copyRight(display4, cutIndex >>> 20)
} else if (cutIndex < (1 << 30)) {
zeroLeft(display0, cutIndex & 31)
display1 = copyRight(display1, (cutIndex >>> 5) & 31)
display2 = copyRight(display2, (cutIndex >>> 10) & 31)
display3 = copyRight(display3, (cutIndex >>> 15) & 31)
display4 = copyRight(display4, (cutIndex >>> 20) & 31)
display5 = copyRight(display5, cutIndex >>> 25)
} else {
throw new IllegalArgumentException()
}
}
// requires structure is writable and at index cutIndex
private def cleanRightEdge(cutIndex: Int) = {
// we're actually sitting one block left if cutIndex lies on a block boundary
// this means that we'll end up erasing the whole block!!
if (cutIndex <= (1 << 5)) {
zeroRight(display0, cutIndex)
} else if (cutIndex <= (1 << 10)) {
zeroRight(display0, ((cutIndex - 1) & 31) + 1)
display1 = copyLeft(display1, cutIndex >>> 5)
} else if (cutIndex <= (1 << 15)) {
zeroRight(display0, ((cutIndex - 1) & 31) + 1)
display1 = copyLeft(display1, (((cutIndex - 1) >>> 5) & 31) + 1)
display2 = copyLeft(display2, cutIndex >>> 10)
} else if (cutIndex <= (1 << 20)) {
zeroRight(display0, ((cutIndex - 1) & 31) + 1)
display1 = copyLeft(display1, (((cutIndex - 1) >>> 5) & 31) + 1)
display2 = copyLeft(display2, (((cutIndex - 1) >>> 10) & 31) + 1)
display3 = copyLeft(display3, cutIndex >>> 15)
} else if (cutIndex <= (1 << 25)) {
zeroRight(display0, ((cutIndex - 1) & 31) + 1)
display1 = copyLeft(display1, (((cutIndex - 1) >>> 5) & 31) + 1)
display2 = copyLeft(display2, (((cutIndex - 1) >>> 10) & 31) + 1)
display3 = copyLeft(display3, (((cutIndex - 1) >>> 15) & 31) + 1)
display4 = copyLeft(display4, cutIndex >>> 20)
} else if (cutIndex <= (1 << 30)) {
zeroRight(display0, ((cutIndex - 1) & 31) + 1)
display1 = copyLeft(display1, (((cutIndex - 1) >>> 5) & 31) + 1)
display2 = copyLeft(display2, (((cutIndex - 1) >>> 10) & 31) + 1)
display3 = copyLeft(display3, (((cutIndex - 1) >>> 15) & 31) + 1)
display4 = copyLeft(display4, (((cutIndex - 1) >>> 20) & 31) + 1)
display5 = copyLeft(display5, cutIndex >>> 25)
} else {
throw new IllegalArgumentException()
}
}
private def requiredDepth(xor: Int) = {
if (xor < (1 << 5)) 1
else if (xor < (1 << 10)) 2
else if (xor < (1 << 15)) 3
else if (xor < (1 << 20)) 4
else if (xor < (1 << 25)) 5
else if (xor < (1 << 30)) 6
else throw new IllegalArgumentException()
}
private def dropFront0(cutIndex: Int): Vector[A] = {
val blockIndex = cutIndex & ~31
val xor = cutIndex ^ (endIndex - 1)
val d = requiredDepth(xor)
val shift = cutIndex & ~((1 << (5 * d)) - 1)
// need to init with full display iff going to cutIndex requires swapping block at level >= d
val s = new Vector(cutIndex - shift, endIndex - shift, blockIndex - shift)
s.initFrom(this)
s.dirty = dirty
s.gotoPosWritable(focus, blockIndex, focus ^ blockIndex)
s.preClean(d)
s.cleanLeftEdge(cutIndex - shift)
s
}
private def dropBack0(cutIndex: Int): Vector[A] = {
val blockIndex = (cutIndex - 1) & ~31
val xor = startIndex ^ (cutIndex - 1)
val d = requiredDepth(xor)
val shift = startIndex & ~((1 << (5 * d)) - 1)
val s = new Vector(startIndex - shift, cutIndex - shift, blockIndex - shift)
s.initFrom(this)
s.dirty = dirty
s.gotoPosWritable(focus, blockIndex, focus ^ blockIndex)
s.preClean(d)
s.cleanRightEdge(cutIndex - shift)
s
}
}
class VectorIterator[+A](_startIndex: Int, endIndex: Int)
extends AbstractIterator[A]
with Iterator[A]
with VectorPointer[A @uncheckedVariance] {
private var blockIndex: Int = _startIndex & ~31
private var lo: Int = _startIndex & 31
private var endLo = math.min(endIndex - blockIndex, 32)
def hasNext = _hasNext
private var _hasNext = blockIndex + lo < endIndex
def next(): A = {
if (!_hasNext) throw new NoSuchElementException("reached iterator end")
val res = display0(lo).asInstanceOf[A]
lo += 1
if (lo == endLo) {
if (blockIndex + lo < endIndex) {
val newBlockIndex = blockIndex + 32
gotoNextBlockStart(newBlockIndex, blockIndex ^ newBlockIndex)
blockIndex = newBlockIndex
endLo = math.min(endIndex - blockIndex, 32)
lo = 0
} else {
_hasNext = false
}
}
res
}
private[collection] def remainingElementCount: Int = (endIndex - (blockIndex + lo)) max 0
/** Creates a new vector which consists of elements remaining in this iterator.
* Such a vector can then be split into several vectors using methods like `take` and `drop`.
*/
private[collection] def remainingVector: Vector[A] = {
val v = new Vector(blockIndex + lo, endIndex, blockIndex + lo)
v.initFrom(this)
v
}
}
/** A class to build instances of `Vector`. This builder is reusable. */
final class VectorBuilder[A]() extends ReusableBuilder[A, Vector[A]] with VectorPointer[A @uncheckedVariance] {
// possible alternative: start with display0 = null, blockIndex = -32, lo = 32
// to avoid allocating initial array if the result will be empty anyways
display0 = new Array[AnyRef](32)
depth = 1
private var blockIndex = 0
private var lo = 0
def +=(elem: A): this.type = {
if (lo >= display0.length) {
val newBlockIndex = blockIndex + 32
gotoNextBlockStartWritable(newBlockIndex, blockIndex ^ newBlockIndex)
blockIndex = newBlockIndex
lo = 0
}
display0(lo) = elem.asInstanceOf[AnyRef]
lo += 1
this
}
override def ++=(xs: TraversableOnce[A]): this.type = super.++=(xs)
def result: Vector[A] = {
val size = blockIndex + lo
if (size == 0)
return Vector.empty
val s = new Vector[A](0, size, 0) // should focus front or back?
s.initFrom(this)
if (depth > 1) s.gotoPos(0, size - 1) // we're currently focused to size - 1, not size!
s
}
def clear(): Unit = {
display5 = null
display4 = null
display3 = null
display2 = null
display1 = null
display0 = new Array[AnyRef](32)
depth = 1
blockIndex = 0
lo = 0
}
}
private[immutable] trait VectorPointer[T] {
private[immutable] var depth: Int = _
private[immutable] var display0: Array[AnyRef] = _
private[immutable] var display1: Array[AnyRef] = _
private[immutable] var display2: Array[AnyRef] = _
private[immutable] var display3: Array[AnyRef] = _
private[immutable] var display4: Array[AnyRef] = _
private[immutable] var display5: Array[AnyRef] = _
// used
private[immutable] final def initFrom[U](that: VectorPointer[U]): Unit = initFrom(that, that.depth)
private[immutable] final def initFrom[U](that: VectorPointer[U], depth: Int) = {
this.depth = depth
(depth - 1) match {
case -1 =>
case 0 =>
display0 = that.display0
case 1 =>
display1 = that.display1
display0 = that.display0
case 2 =>
display2 = that.display2
display1 = that.display1
display0 = that.display0
case 3 =>
display3 = that.display3
display2 = that.display2
display1 = that.display1
display0 = that.display0
case 4 =>
display4 = that.display4
display3 = that.display3
display2 = that.display2
display1 = that.display1
display0 = that.display0
case 5 =>
display5 = that.display5
display4 = that.display4
display3 = that.display3
display2 = that.display2
display1 = that.display1
display0 = that.display0
}
}
// requires structure is at pos oldIndex = xor ^ index
private[immutable] final def getElem(index: Int, xor: Int): T = {
if (xor < (1 << 5)) { // level = 0
(display0
(index & 31).asInstanceOf[T])
} else if (xor < (1 << 10)) { // level = 1
(display1
((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
(index & 31).asInstanceOf[T])
} else if (xor < (1 << 15)) { // level = 2
(display2
((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
(index & 31).asInstanceOf[T])
} else if (xor < (1 << 20)) { // level = 3
(display3
((index >>> 15) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
(index & 31).asInstanceOf[T])
} else if (xor < (1 << 25)) { // level = 4
(display4
((index >>> 20) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 15) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
(index & 31).asInstanceOf[T])
} else if (xor < (1 << 30)) { // level = 5
(display5
((index >>> 25) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 20) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 15) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
(index & 31).asInstanceOf[T])
} else { // level = 6
throw new IllegalArgumentException()
}
}
// go to specific position
// requires structure is at pos oldIndex = xor ^ index,
// ensures structure is at pos index
private[immutable] final def gotoPos(index: Int, xor: Int): Unit = {
if (xor < (1 << 5)) { // level = 0
// we're already at the block start pos
} else if (xor < (1 << 10)) { // level = 1
display0 = display1((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 15)) { // level = 2
display1 = display2((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
display0 = display1((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 20)) { // level = 3
display2 = display3((index >>> 15) & 31).asInstanceOf[Array[AnyRef]]
display1 = display2((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
display0 = display1((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 25)) { // level = 4
display3 = display4((index >>> 20) & 31).asInstanceOf[Array[AnyRef]]
display2 = display3((index >>> 15) & 31).asInstanceOf[Array[AnyRef]]
display1 = display2((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
display0 = display1((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 30)) { // level = 5
display4 = display5((index >>> 25) & 31).asInstanceOf[Array[AnyRef]]
display3 = display4((index >>> 20) & 31).asInstanceOf[Array[AnyRef]]
display2 = display3((index >>> 15) & 31).asInstanceOf[Array[AnyRef]]
display1 = display2((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
display0 = display1((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
} else { // level = 6
throw new IllegalArgumentException()
}
}
// USED BY ITERATOR
// xor: oldIndex ^ index
private[immutable] final def gotoNextBlockStart(index: Int, xor: Int): Unit = { // goto block start pos
if (xor < (1 << 10)) { // level = 1
display0 = display1((index >>> 5) & 31).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 15)) { // level = 2
display1 = display2((index >>> 10) & 31).asInstanceOf[Array[AnyRef]]
display0 = display1(0).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 20)) { // level = 3
display2 = display3((index >>> 15) & 31).asInstanceOf[Array[AnyRef]]
display1 = display2(0).asInstanceOf[Array[AnyRef]]
display0 = display1(0).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 25)) { // level = 4
display3 = display4((index >>> 20) & 31).asInstanceOf[Array[AnyRef]]
display2 = display3(0).asInstanceOf[Array[AnyRef]]
display1 = display2(0).asInstanceOf[Array[AnyRef]]
display0 = display1(0).asInstanceOf[Array[AnyRef]]
} else if (xor < (1 << 30)) { // level = 5
display4 = display5((index >>> 25) & 31).asInstanceOf[Array[AnyRef]]
display3 = display4(0).asInstanceOf[Array[AnyRef]]
display2 = display3(0).asInstanceOf[Array[AnyRef]]
display1 = display2(0).asInstanceOf[Array[AnyRef]]
display0 = display1(0).asInstanceOf[Array[AnyRef]]
} else { // level = 6
throw new IllegalArgumentException()
}
}
// USED BY BUILDER
// xor: oldIndex ^ index
private[immutable] final def gotoNextBlockStartWritable(index: Int, xor: Int): Unit = { // goto block start pos
if (xor < (1 << 10)) { // level = 1
if (depth == 1) { display1 = new Array(32); display1(0) = display0; depth += 1 }
display0 = new Array(32)
display1((index >>> 5) & 31) = display0
} else if (xor < (1 << 15)) { // level = 2
if (depth == 2) { display2 = new Array(32); display2(0) = display1; depth += 1 }
display0 = new Array(32)
display1 = new Array(32)
display1((index >>> 5) & 31) = display0
display2((index >>> 10) & 31) = display1
} else if (xor < (1 << 20)) { // level = 3
if (depth == 3) { display3 = new Array(32); display3(0) = display2; depth += 1 }
display0 = new Array(32)
display1 = new Array(32)
display2 = new Array(32)
display1((index >>> 5) & 31) = display0
display2((index >>> 10) & 31) = display1
display3((index >>> 15) & 31) = display2
} else if (xor < (1 << 25)) { // level = 4
if (depth == 4) { display4 = new Array(32); display4(0) = display3; depth += 1 }
display0 = new Array(32)
display1 = new Array(32)
display2 = new Array(32)
display3 = new Array(32)
display1((index >>> 5) & 31) = display0
display2((index >>> 10) & 31) = display1
display3((index >>> 15) & 31) = display2
display4((index >>> 20) & 31) = display3
} else if (xor < (1 << 30)) { // level = 5
if (depth == 5) { display5 = new Array(32); display5(0) = display4; depth += 1 }
display0 = new Array(32)
display1 = new Array(32)
display2 = new Array(32)
display3 = new Array(32)
display4 = new Array(32)
display1((index >>> 5) & 31) = display0
display2((index >>> 10) & 31) = display1
display3((index >>> 15) & 31) = display2
display4((index >>> 20) & 31) = display3
display5((index >>> 25) & 31) = display4
} else { // level = 6
throw new IllegalArgumentException()
}
}
// STUFF BELOW USED BY APPEND / UPDATE
private[immutable] final def copyOf(a: Array[AnyRef]): Array[AnyRef] = {
val copy = new Array[AnyRef](a.length)
java.lang.System.arraycopy(a, 0, copy, 0, a.length)
copy
}
private[immutable] final def nullSlotAndCopy(array: Array[AnyRef], index: Int): Array[AnyRef] = {
val x = array(index)
array(index) = null
copyOf(x.asInstanceOf[Array[AnyRef]])
}
// make sure there is no aliasing
// requires structure is at pos index
// ensures structure is clean and at pos index and writable at all levels except 0
private[immutable] final def stabilize(index: Int) = (depth - 1) match {
case 5 =>
display5 = copyOf(display5)
display4 = copyOf(display4)
display3 = copyOf(display3)
display2 = copyOf(display2)
display1 = copyOf(display1)
display5((index >>> 25) & 31) = display4
display4((index >>> 20) & 31) = display3
display3((index >>> 15) & 31) = display2
display2((index >>> 10) & 31) = display1
display1((index >>> 5) & 31) = display0
case 4 =>
display4 = copyOf(display4)
display3 = copyOf(display3)
display2 = copyOf(display2)
display1 = copyOf(display1)
display4((index >>> 20) & 31) = display3
display3((index >>> 15) & 31) = display2
display2((index >>> 10) & 31) = display1
display1((index >>> 5) & 31) = display0
case 3 =>
display3 = copyOf(display3)
display2 = copyOf(display2)
display1 = copyOf(display1)
display3((index >>> 15) & 31) = display2
display2((index >>> 10) & 31) = display1
display1((index >>> 5) & 31) = display0
case 2 =>
display2 = copyOf(display2)
display1 = copyOf(display1)
display2((index >>> 10) & 31) = display1
display1((index >>> 5) & 31) = display0
case 1 =>
display1 = copyOf(display1)
display1((index >>> 5) & 31) = display0
case 0 =>
}
/// USED IN UPDATE AND APPEND BACK
// prepare for writing at an existing position
// requires structure is clean and at pos oldIndex = xor ^ newIndex,
// ensures structure is dirty and at pos newIndex and writable at level 0
private[immutable] final def gotoPosWritable0(newIndex: Int, xor: Int): Unit = (depth - 1) match {
case 5 =>
display5 = copyOf(display5)
display4 = nullSlotAndCopy(display5, (newIndex >>> 25) & 31)
display3 = nullSlotAndCopy(display4, (newIndex >>> 20) & 31)
display2 = nullSlotAndCopy(display3, (newIndex >>> 15) & 31)
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
case 4 =>
display4 = copyOf(display4)
display3 = nullSlotAndCopy(display4, (newIndex >>> 20) & 31)
display2 = nullSlotAndCopy(display3, (newIndex >>> 15) & 31)
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
case 3 =>
display3 = copyOf(display3)
display2 = nullSlotAndCopy(display3, (newIndex >>> 15) & 31)
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
case 2 =>
display2 = copyOf(display2)
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
case 1 =>
display1 = copyOf(display1)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
case 0 =>
display0 = copyOf(display0)
}
// requires structure is dirty and at pos oldIndex,
// ensures structure is dirty and at pos newIndex and writable at level 0
private[immutable] final def gotoPosWritable1(oldIndex: Int, newIndex: Int, xor: Int): Unit = {
if (xor < (1 << 5)) { // level = 0
display0 = copyOf(display0)
} else if (xor < (1 << 10)) { // level = 1
display1 = copyOf(display1)
display1((oldIndex >>> 5) & 31) = display0
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
} else if (xor < (1 << 15)) { // level = 2
display1 = copyOf(display1)
display2 = copyOf(display2)
display1((oldIndex >>> 5) & 31) = display0
display2((oldIndex >>> 10) & 31) = display1
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
} else if (xor < (1 << 20)) { // level = 3
display1 = copyOf(display1)
display2 = copyOf(display2)
display3 = copyOf(display3)
display1((oldIndex >>> 5) & 31) = display0
display2((oldIndex >>> 10) & 31) = display1
display3((oldIndex >>> 15) & 31) = display2
display2 = nullSlotAndCopy(display3, (newIndex >>> 15) & 31)
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
} else if (xor < (1 << 25)) { // level = 4
display1 = copyOf(display1)
display2 = copyOf(display2)
display3 = copyOf(display3)
display4 = copyOf(display4)
display1((oldIndex >>> 5) & 31) = display0
display2((oldIndex >>> 10) & 31) = display1
display3((oldIndex >>> 15) & 31) = display2
display4((oldIndex >>> 20) & 31) = display3
display3 = nullSlotAndCopy(display4, (newIndex >>> 20) & 31)
display2 = nullSlotAndCopy(display3, (newIndex >>> 15) & 31)
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
} else if (xor < (1 << 30)) { // level = 5
display1 = copyOf(display1)
display2 = copyOf(display2)
display3 = copyOf(display3)
display4 = copyOf(display4)
display5 = copyOf(display5)
display1((oldIndex >>> 5) & 31) = display0
display2((oldIndex >>> 10) & 31) = display1
display3((oldIndex >>> 15) & 31) = display2
display4((oldIndex >>> 20) & 31) = display3
display5((oldIndex >>> 25) & 31) = display4
display4 = nullSlotAndCopy(display5, (newIndex >>> 25) & 31)
display3 = nullSlotAndCopy(display4, (newIndex >>> 20) & 31)
display2 = nullSlotAndCopy(display3, (newIndex >>> 15) & 31)
display1 = nullSlotAndCopy(display2, (newIndex >>> 10) & 31)
display0 = nullSlotAndCopy(display1, (newIndex >>> 5) & 31)
} else { // level = 6
throw new IllegalArgumentException()
}
}
// USED IN DROP
private[immutable] final def copyRange(array: Array[AnyRef], oldLeft: Int, newLeft: Int) = {
val elems = new Array[AnyRef](32)
java.lang.System.arraycopy(array, oldLeft, elems, newLeft, 32 - math.max(newLeft, oldLeft))
elems
}
// USED IN APPEND
// create a new block at the bottom level (and possibly nodes on its path) and prepares for writing
// requires structure is clean and at pos oldIndex,
// ensures structure is dirty and at pos newIndex and writable at level 0
private[immutable] final def gotoFreshPosWritable0(oldIndex: Int, newIndex: Int, xor: Int): Unit = { // goto block start pos
if (xor < (1 << 5)) { // level = 0
// we're already at the block start
} else if (xor < (1 << 10)) { // level = 1
if (depth == 1) {
display1 = new Array(32)
display1((oldIndex >>> 5) & 31) = display0
depth += 1
}
display0 = new Array(32)
} else if (xor < (1 << 15)) { // level = 2
if (depth == 2) {
display2 = new Array(32)
display2((oldIndex >>> 10) & 31) = display1
depth += 1
}
display1 = display2((newIndex >>> 10) & 31).asInstanceOf[Array[AnyRef]]
if (display1 == null) display1 = new Array(32)
display0 = new Array(32)
} else if (xor < (1 << 20)) { // level = 3
if (depth == 3) {
display3 = new Array(32)
display3((oldIndex >>> 15) & 31) = display2
depth += 1
}
display2 = display3((newIndex >>> 15) & 31).asInstanceOf[Array[AnyRef]]
if (display2 == null) display2 = new Array(32)
display1 = display2((newIndex >>> 10) & 31).asInstanceOf[Array[AnyRef]]
if (display1 == null) display1 = new Array(32)
display0 = new Array(32)
} else if (xor < (1 << 25)) { // level = 4
if (depth == 4) {
display4 = new Array(32)
display4((oldIndex >>> 20) & 31) = display3
depth += 1
}
display3 = display4((newIndex >>> 20) & 31).asInstanceOf[Array[AnyRef]]
if (display3 == null) display3 = new Array(32)
display2 = display3((newIndex >>> 15) & 31).asInstanceOf[Array[AnyRef]]
if (display2 == null) display2 = new Array(32)
display1 = display2((newIndex >>> 10) & 31).asInstanceOf[Array[AnyRef]]
if (display1 == null) display1 = new Array(32)
display0 = new Array(32)
} else if (xor < (1 << 30)) { // level = 5
if (depth == 5) {
display5 = new Array(32)
display5((oldIndex >>> 25) & 31) = display4
depth += 1
}
display4 = display5((newIndex >>> 25) & 31).asInstanceOf[Array[AnyRef]]
if (display4 == null) display4 = new Array(32)
display3 = display4((newIndex >>> 20) & 31).asInstanceOf[Array[AnyRef]]
if (display3 == null) display3 = new Array(32)
display2 = display3((newIndex >>> 15) & 31).asInstanceOf[Array[AnyRef]]
if (display2 == null) display2 = new Array(32)
display1 = display2((newIndex >>> 10) & 31).asInstanceOf[Array[AnyRef]]
if (display1 == null) display1 = new Array(32)
display0 = new Array(32)
} else { // level = 6
throw new IllegalArgumentException()
}
}
// requires structure is dirty and at pos oldIndex,
// ensures structure is dirty and at pos newIndex and writable at level 0
private[immutable] final def gotoFreshPosWritable1(oldIndex: Int, newIndex: Int, xor: Int): Unit = {
stabilize(oldIndex)
gotoFreshPosWritable0(oldIndex, newIndex, xor)
}
}
