[native] Remove code support for experimental KonanTargets

ZEPHYR was the first and the last experimental KonanTarget.
As ZEPHYR is now entirely removed from the codebase, the respective code
can be dropped

^KT-64517

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/internal/PlatformLibrariesGenerator.kt

@@ -11,7 +11,6 @@ import org.jetbrains.kotlin.compilerRunner.getKonanCacheKind
 import org.jetbrains.kotlin.compilerRunner.konanDataDir
 import org.jetbrains.kotlin.compilerRunner.konanHome
 import org.jetbrains.kotlin.gradle.dsl.NativeCacheKind
-import org.jetbrains.kotlin.gradle.plugin.PropertiesProvider
 import org.jetbrains.kotlin.gradle.targets.native.KonanPropertiesBuildService
 import org.jetbrains.kotlin.gradle.tasks.CacheBuilder
 import org.jetbrains.kotlin.gradle.tasks.addArg
@@ -127,7 +126,7 @@ internal class PlatformLibrariesGenerator(val project: Project, val konanTarget:
     }
 
     fun generatePlatformLibsIfNeeded(): Unit = with(project) {
-        if (!HostManager(distribution).isEnabled(konanTarget)) {
+        if (!HostManager().isEnabled(konanTarget)) {
             // We cannot generate libs on a machine that doesn't support the requested target.
             return
         }
@@ -221,4 +220,4 @@ internal class PlatformLibrariesGenerator(val project: Project, val konanTarget:
     companion object {
         private const val GENERATED_LIBS_PROPERTY_NAME = "org.jetbrains.kotlin.native.platform.libs.info"
     }
-}
+}

native/native.tests/tests/org/jetbrains/kotlin/konan/test/blackbox/support/NativeTestSupport.kt

@@ -177,7 +177,7 @@ internal object NativeTestSupport {
         val nativeHome = getOrCreateTestProcessSettings().get<KotlinNativeHome>()
 
         val distribution = Distribution(nativeHome.dir.path)
-        val hostManager = HostManager(distribution, experimental = false)
+        val hostManager = HostManager()
         val nativeTargets = computeNativeTargets(enforcedProperties, hostManager)
 
         val cacheMode = computeCacheMode(enforcedProperties, distribution, nativeTargets, optimizationMode)

native/native.tests/tests/org/jetbrains/kotlin/konan/test/blackbox/support/settings/SettingsContainers.kt

@@ -71,5 +71,5 @@ internal val Settings.configurables: Configurables
             // Development variant of LLVM is used to have utilities like FileCheck
             propertyOverrides = mapOf("llvmHome.${HostManager.hostName}" to "\$llvm.${HostManager.hostName}.dev")
         )
-        return PlatformManager(distribution, true).platform(get<KotlinNativeTargets>().testTarget).configurables
+        return PlatformManager(distribution).platform(get<KotlinNativeTargets>().testTarget).configurables
     }

native/utils/src/org/jetbrains/kotlin/konan/target/Distribution.kt

@@ -31,9 +31,6 @@ class Distribution private constructor(private val serialized: Serialized) : jav
 
     val konanSubdir = "$konanHome/konan"
     val mainPropertyFileName = "$konanSubdir/konan.properties"
-    val experimentalEnabled by lazy {
-        File("$konanSubdir/experimentalTargetsEnabled").exists
-    }
 
     private fun propertyFilesFromConfigDir(configDir: String, genericName: String): List<File> {
         val directory = File(configDir, "platforms/$genericName")
@@ -65,12 +62,6 @@ class Distribution private constructor(private val serialized: Serialized) : jav
 
         loadPropertiesSafely(File(mainPropertyFileName))
 
-        HostManager.knownTargetTemplates.forEach { targetTemplate ->
-            additionalPropertyFiles(targetTemplate).forEach {
-                loadPropertiesSafely(it)
-            }
-        }
-
         if (onlyDefaultProfiles) {
             result.keepOnlyDefaultProfiles()
         }
@@ -109,11 +100,6 @@ class Distribution private constructor(private val serialized: Serialized) : jav
         .getDependenciesRoot(konanDataDir)
         .absolutePath
 
-    val subTargetProvider = object: SubTargetProvider {
-        override fun availableSubTarget(genericName: String) =
-                additionalPropertyFiles(genericName).map { it.name }
-    }
-
     companion object {
         /**
          * Try to guess compiler version using [konanHome].

native/utils/src/org/jetbrains/kotlin/konan/target/HostManager.kt

@@ -8,23 +8,10 @@ package org.jetbrains.kotlin.konan.target
 import org.jetbrains.kotlin.konan.target.KonanTarget.*
 import java.lang.Exception
 
-// TODO: Consider redesigning experimental targets support (e.g. by getting rid of such separation at all).
-open class HostManager(
-    subTargetProvider: SubTargetProvider = SubTargetProvider.NoSubTargets,
-    private val experimental: Boolean = false
-) {
-
-    constructor(
-        distribution: Distribution,
-        experimental: Boolean = false
-    ) : this(distribution.subTargetProvider, experimental || distribution.experimentalEnabled)
-
+open class HostManager() {
     fun targetManager(userRequest: String? = null): TargetManager = TargetManagerImpl(userRequest, this)
 
-    private val zephyrSubtargets = subTargetProvider.availableSubTarget("zephyr").map { ZEPHYR(it) }
-    private val configurableSubtargets = zephyrSubtargets
-
-    val targetValues: List<KonanTarget> by lazy { KonanTarget.predefinedTargets.values + configurableSubtargets }
+    val targetValues: List<KonanTarget> by lazy { KonanTarget.predefinedTargets.values.toList() }
 
     val targets = targetValues.associateBy { it.visibleName }
 
@@ -50,27 +37,21 @@ open class HostManager(
         LINUX_X64,
         LINUX_ARM32_HFP,
         LINUX_ARM64,
-        LINUX_MIPS32,
-        LINUX_MIPSEL32,
-        MINGW_X86,
         MINGW_X64,
         ANDROID_X86,
         ANDROID_X64,
         ANDROID_ARM32,
         ANDROID_ARM64,
-        WASM32
     )
 
     private val appleTargets = setOf(
         MACOS_X64,
         MACOS_ARM64,
-        IOS_ARM32,
         IOS_ARM64,
         IOS_X64,
         IOS_SIMULATOR_ARM64,
         WATCHOS_ARM32,
         WATCHOS_ARM64,
-        WATCHOS_X86,
         WATCHOS_X64,
         WATCHOS_SIMULATOR_ARM64,
         WATCHOS_DEVICE_ARM64,
@@ -79,40 +60,15 @@ open class HostManager(
         TVOS_SIMULATOR_ARM64,
     )
 
-    private val enabledRegularByHost: Map<KonanTarget, Set<KonanTarget>> = mapOf(
+    val enabledByHost: Map<KonanTarget, Set<KonanTarget>> = mapOf(
         LINUX_X64 to commonTargets,
         MINGW_X64 to commonTargets,
         MACOS_X64 to commonTargets + appleTargets,
         MACOS_ARM64 to commonTargets + appleTargets
     )
 
-    private val enabledExperimentalByHost: Map<KonanTarget, Set<KonanTarget>> = mapOf(
-        LINUX_X64 to zephyrSubtargets.toSet(),
-        MACOS_X64 to zephyrSubtargets.toSet(),
-        MINGW_X64 to zephyrSubtargets.toSet(),
-        MACOS_ARM64 to emptySet()
-    )
-
-    val enabledByHost: Map<KonanTarget, Set<KonanTarget>> by lazy {
-        val result = enabledRegularByHost.toMutableMap()
-        if (experimental) {
-            enabledExperimentalByHost.forEach { (k, v) ->
-                result.merge(k, v) { old, new -> old + new }
-            }
-        }
-        result.toMap()
-    }
-
-    private val enabledRegular: List<KonanTarget> by lazy {
-        enabledRegularByHost[host]?.toList() ?: throw TargetSupportException("Unknown host platform: $host")
-    }
-
-    private val enabledExperimental: List<KonanTarget> by lazy {
-        enabledExperimentalByHost[host]?.toList() ?: throw TargetSupportException("Unknown host platform: $host")
-    }
-
     val enabled: List<KonanTarget>
-        get() = if (experimental) enabledRegular + enabledExperimental else enabledRegular
+        get() = enabledByHost[host]?.toList() ?: throw TargetSupportException("Unknown host platform: $host")
 
     fun isEnabled(target: KonanTarget) = enabled.contains(target)
 
@@ -207,8 +163,6 @@ open class HostManager(
         val hostName: String
             get() = host.name
 
-        val knownTargetTemplates = listOf("zephyr")
-
         private val targetAliasResolutions = mapOf(
             "linux" to "linux_x64",
             "macbook" to "macos_x64",

native/utils/src/org/jetbrains/kotlin/konan/target/Platform.kt

@@ -32,10 +32,20 @@ class Platform(val configurables: Configurables) : Configurables by configurable
 }
 
 class PlatformManager private constructor(private val serialized: Serialized) :
-    HostManager(serialized.distribution, serialized.experimental), java.io.Serializable {
+    HostManager(), java.io.Serializable {
 
-    constructor(konanHome: String, experimental: Boolean = false, konanDataDir: String? = null) : this(Distribution(konanHome, konanDataDir = konanDataDir), experimental)
-    constructor(distribution: Distribution, experimental: Boolean = false) : this(Serialized(distribution, experimental))
+    // TODO(KT-66500): remove after the bootstrap
+    @Suppress("UNUSED_PARAMETER")
+    @Deprecated("Kept temporary, should be removed after the bootstrap")
+    constructor(konanHome: String, experimental: Boolean = false, konanDataDir: String? = null) : this(Distribution(konanHome, konanDataDir = konanDataDir))
+
+    // TODO(KT-66500): remove after the bootstrap
+    @Suppress("UNUSED_PARAMETER")
+    @Deprecated("Kept temporary, should be removed after the bootstrap")
+    constructor(distribution: Distribution, experimental: Boolean = false) : this(Serialized(distribution))
+
+    constructor(konanHome: String, konanDataDir: String? = null) : this(Distribution(konanHome, konanDataDir = konanDataDir))
+    constructor(distribution: Distribution) : this(Serialized(distribution))
 
     private val distribution by serialized::distribution
 
@@ -56,9 +66,9 @@ class PlatformManager private constructor(private val serialized: Serialized) :
 
     private data class Serialized(
         val distribution: Distribution,
-        val experimental: Boolean,
     ) : java.io.Serializable {
         companion object {
+            // TODO(discuss on review): bump UID? Do something else? How this Serialized is used?
             private const val serialVersionUID: Long = 0L
         }
 

native/utils/src/org/jetbrains/kotlin/konan/target/SubTargetProvider.kt

@@ -1,14 +0,0 @@
-/*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package org.jetbrains.kotlin.konan.target
-
-interface SubTargetProvider {
-    fun availableSubTarget(genericName: String): List<String>
-
-    object NoSubTargets : SubTargetProvider {
-        override fun availableSubTarget(genericName: String): List<String> = emptyList()
-    }
-}