Generate sum() methods for arrays, iterables and sequences of Byte and Short. These overloads got explicit platformName.

Heuristics to decide when to set platformName.
#KT-3714

libraries/tools/kotlin-stdlib-gen/src/generators/GenerateCollections.kt

@@ -23,16 +23,10 @@ fun generateCollectionsAPI(outDir: File) {
 
     numeric().writeTo(File(outDir, "_Numeric.kt")) {
         val builder = StringBuilder()
-        // TODO: decide if sum for byte and short is needed and how to make it work
-        for (numeric in listOf(PrimitiveType.Int, PrimitiveType.Long, /*Byte, Short, */ PrimitiveType.Double, PrimitiveType.Float)) {
-            build(builder, Iterables, numeric)
-            build(builder, Sequences, numeric)
-        }
+        for (numeric in numericPrimitives)
+            for (family in buildFamilies)
+                build(builder, family, numeric)
 
-        for (numeric in numericPrimitives) {
-            build(builder, ArraysOfObjects, numeric)
-            build(builder, ArraysOfPrimitives, numeric)
-        }
         builder.toString()
     }
 

libraries/tools/kotlin-stdlib-gen/src/generators/GenerateStandardLib.kt

@@ -43,6 +43,7 @@ fun List<GenericFunction>.writeTo(file: File, builder: GenericFunction.() -> Str
     its.use {
         its.append("package kotlin\n\n")
         its.append("$COMMON_AUTOGENERATED_WARNING\n\n")
+        its.append("import kotlin.platform.*\n")
         its.append("import java.util.*\n\n")
         its.append("import java.util.Collections // TODO: it's temporary while we have java.util.Collections in js\n\n")
         for (t in this.sort()) {

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

@@ -6,6 +6,7 @@ import java.util.ArrayList
 import java.util.HashMap
 import java.util.HashSet
 import java.util.StringTokenizer
+import kotlin.properties.Delegates
 
 enum class Family {
     Sequences
@@ -20,6 +21,8 @@ enum class Family {
     ProgressionsOfPrimitives
     Primitives
     Generic
+
+    val isPrimitiveSpecialization: Boolean by Delegates.lazy { this in listOf(ArraysOfPrimitives, RangesOfPrimitives, ProgressionsOfPrimitives, Primitives) }
 }
 
 enum class PrimitiveType(val name: String) {
@@ -169,7 +172,7 @@ class GenericFunction(val signature: String, val keyword: String = "fun") : Comp
     }
 
     fun build(builder: StringBuilder, f: Family) {
-        if (f == ArraysOfPrimitives || f == RangesOfPrimitives || f == ProgressionsOfPrimitives || f == Primitives) {
+        if (f.isPrimitiveSpecialization) {
             for (primitive in buildPrimitives.sortBy { it.name() })
                 build(builder, f, primitive)
         } else {
@@ -308,6 +311,11 @@ class GenericFunction(val signature: String, val keyword: String = "fun") : Comp
             }
         }
 
+        fun getPlatformName(primitive: PrimitiveType): String {
+            val name = signature.substringBefore('(').trim()
+            return "${name}Of${primitive.name}"
+        }
+
         val methodDoc = docs[f] ?: doc
         if (methodDoc != "") {
             builder.append("/**\n")
@@ -324,6 +332,10 @@ class GenericFunction(val signature: String, val keyword: String = "fun") : Comp
             builder.append("deprecated(\"$deprecated\")\n")
         }
 
+        // heuristics to define that platform overloads are likely to clash
+        if (!f.isPrimitiveSpecialization && primitive != null && ((returnType == returnType.renderType() && returnType != "T") || returnType == "SUM"))
+            builder.append("platformName(\"${getPlatformName(primitive!!)}\")\n")
+
         builder.append("public ")
         if (inlineFamilies[f] ?: defaultInline)
             builder.append("inline ")

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

@@ -6,7 +6,8 @@ fun numeric(): List<GenericFunction> {
     val templates = arrayListOf<GenericFunction>()
 
     templates add f("sum()") {
-        doc { "Returns the sum of all elements in the collection" }
+        exclude(Strings)
+        doc { "Returns the sum of all elements in the collection." }
         returns("SUM")
         body {
             """