Implement conversion from typed array and collection to UArrays

libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt

@@ -2327,6 +2327,10 @@ public final class kotlin/collections/UArraysKt {
 	public static final fun toTypedArray-GBYM_sE ([B)[Lkotlin/UByte;
 	public static final fun toTypedArray-QwZRm1k ([J)[Lkotlin/ULong;
 	public static final fun toTypedArray-rL5Bavg ([S)[Lkotlin/UShort;
+	public static final fun toUByteArray ([Lkotlin/UByte;)[B
+	public static final fun toUIntArray ([Lkotlin/UInt;)[I
+	public static final fun toULongArray ([Lkotlin/ULong;)[J
+	public static final fun toUShortArray ([Lkotlin/UShort;)[S
 }
 
 public abstract class kotlin/collections/UByteIterator : java/util/Iterator, kotlin/jvm/internal/markers/KMappedMarker {
@@ -2337,6 +2341,13 @@ public abstract class kotlin/collections/UByteIterator : java/util/Iterator, kot
 	public fun remove ()V
 }
 
+public final class kotlin/collections/UCollectionsKt {
+	public static final fun toUByteArray (Ljava/util/Collection;)[B
+	public static final fun toUIntArray (Ljava/util/Collection;)[I
+	public static final fun toULongArray (Ljava/util/Collection;)[J
+	public static final fun toUShortArray (Ljava/util/Collection;)[S
+}
+
 public abstract class kotlin/collections/UIntIterator : java/util/Iterator, kotlin/jvm/internal/markers/KMappedMarker {
 	public fun <init> ()V
 	public synthetic fun next ()Ljava/lang/Object;

libraries/tools/kotlin-stdlib-gen/src/templates/Arrays.kt

@@ -322,26 +322,35 @@ object ArrayOps : TemplateGroupBase() {
     }
 
     val f_toPrimitiveArray = fn("toPrimitiveArray()") {
-        include(ArraysOfObjects, PrimitiveType.defaultPrimitives)
-        include(Collections, PrimitiveType.defaultPrimitives)
+        include(ArraysOfObjects, PrimitiveType.values().toSet())
+        include(Collections, PrimitiveType.values().toSet())
     } builder {
         val primitive = checkNotNull(primitive)
         val arrayType = primitive.name + "Array"
         signature("to$arrayType()")
         returns(arrayType)
+
+        if (primitive in PrimitiveType.unsignedPrimitives) {
+            since("1.3")
+            annotation("@ExperimentalUnsignedTypes")
+        }
+
         // TODO: Use different implementations for JS
         specialFor(ArraysOfObjects) {
+            if (primitive in PrimitiveType.unsignedPrimitives) {
+                sourceFile(SourceFile.UArrays)
+            }
             doc { "Returns an array of ${primitive.name} containing all of the elements of this generic array." }
             body {
                 """
-                val result = $arrayType(size)
-                for (index in indices)
-                    result[index] = this[index]
-                return result
+                return $arrayType(size) { index -> this[index] }
                 """
             }
         }
         specialFor(Collections) {
+            if (primitive in PrimitiveType.unsignedPrimitives) {
+                sourceFile(SourceFile.UCollections)
+            }
             doc { "Returns an array of ${primitive.name} containing all of the elements of this collection." }
             body {
                 """

libraries/tools/kotlin-stdlib-gen/src/templates/dsl/SourceFile.kt

@@ -10,6 +10,7 @@ enum class SourceFile(jvmClassName: String? = null, val multifile: Boolean = tru
     Arrays(packageName = "kotlin.collections"),
     UArrays(packageName = "kotlin.collections"),
     Collections(packageName = "kotlin.collections"),
+    UCollections(packageName = "kotlin.collections"),
     Sets(packageName = "kotlin.collections"),
     Maps(packageName = "kotlin.collections"),
     Sequences(packageName = "kotlin.sequences"),