Remove unused methods from Gradle plugin

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/kapt/KaptWithKotlincTask.kt

@@ -81,9 +81,4 @@ open class KaptWithKotlincTask : KaptTask(), CompilerArgumentAwareWithInput<K2JV
 
     private val isAtLeastJava9: Boolean
         get() = SystemInfo.isJavaVersionAtLeast(9, 0, 0)
-
-    private fun getJavaRuntimeVersion(): String {
-        val rtVersion = System.getProperty("java.runtime.version")
-        return if (Character.isDigit(rtVersion[0])) rtVersion else System.getProperty("java.version")
-    }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/gradleUtils.kt

@@ -41,12 +41,6 @@ internal fun AbstractCompile.appendClasspathDynamically(file: File) {
     }
 }
 
-// Extends finalizedBy clause so that finalizing task does not run if finalized task failed
-internal fun Task.finalizedByIfNotFailed(finalizer: Task) {
-    finalizer.onlyIf { this@finalizedByIfNotFailed.state.failure == null }
-    this.finalizedBy(finalizer)
-}
-
 fun AbstractCompile.mapClasspath(fn: () -> FileCollection) {
     conventionMapping.map("classpath", fn)
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/jarSearchingUtil.kt

@@ -96,12 +96,6 @@ internal fun findKotlinStdlibClasspath(project: Project): List<File> =
 internal fun findKotlinScriptRuntimeClasspath(project: Project): List<File> =
     findKotlinModuleJar(project, KOTLIN_SCRIPT_RUNTIME_EXPECTED_CLASS, KOTLIN_SCRIPT_RUNTIME)
 
-internal fun findKotlinScriptCommonClasspath(project: Project): List<File> =
-    findKotlinModuleJar(project, KOTLIN_SCRIPT_ANNOTATION_EXPECTED_CLASS, KOTLIN_SCRIPT_COMMON)
-
-internal fun findKotlinScriptJvmClasspath(project: Project): List<File> =
-    findKotlinModuleJar(project, KOTLIN_JVM_SCRIPT_COMPILER_EXPECTED_CLASS, KOTLIN_SCRIPT_JVM)
-
 internal fun findKotlinReflectClasspath(project: Project): List<File> =
     findKotlinModuleJar(project, KOTLIN_REFLECT_EXPECTED_CLASS, KOTLIN_REFLECT)
 
@@ -120,18 +114,6 @@ internal fun findToolsJar(): File? {
     return javacUtilContextClass?.let(::findJarByClass)
 }
 
-internal fun findCoroutinesClasspath(): List<File> {
-    val classLoader = Thread.currentThread().contextClassLoader
-    val prefix = "kotlinx." // because shadow plugin rewrites strings too, so the fqn should be constructed on runtime
-    val clazz = try {
-        classLoader.loadClass(prefix + "coroutines.experimental.BuildersKt")
-    } catch (e: ClassNotFoundException) {
-        null
-    } ?: return emptyList()
-
-    return (findJarByClass(clazz))?.let { listOf(it) } ?: emptyList()
-}
-
 private fun findJarByClass(klass: Class<*>): File? {
     val classFileName = klass.name.substringAfterLast(".") + ".class"
     val resource = klass.getResource(classFileName) ?: return null

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/utils/compatibiltiy.kt

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.gradle.utils
 
 import org.gradle.api.GradleException
 import org.gradle.api.Task
-import org.gradle.api.tasks.SourceSetOutput
 import org.gradle.api.tasks.TaskInputs
 import org.gradle.api.tasks.TaskOutputs
 import org.gradle.util.GradleVersion
@@ -27,16 +26,6 @@ internal val Task.inputsCompatible: TaskInputs get() = inputs
 
 internal val Task.outputsCompatible: TaskOutputs get() = outputs
 
-private val filesMethod by lazy {
-    TaskInputs::class.java.methods.first {
-        it.name == "files" && it.parameterTypes.contentEquals(arrayOf(Array<Any>::class.java))
-    }
-}
-
-internal fun TaskInputs.filesCompatible(vararg files: Any) {
-    filesMethod(this, files)
-}
-
 private val propertyMethod by lazy {
     TaskInputs::class.java.methods.first {
         it.name == "property" && it.parameterTypes.contentEquals(arrayOf(String::class.java, Any::class.java))
@@ -47,36 +36,6 @@ internal fun TaskInputs.propertyCompatible(name: String, value: Any) {
     propertyMethod(this, name, value)
 }
 
-private val outputsDirMethod by lazy {
-    TaskOutputs::class.java.methods.first {
-        it.name == "dir" && it.parameterTypes.contentEquals(arrayOf(Any::class.java))
-    }
-}
-
-internal fun TaskOutputs.dirCompatible(value: Any) {
-    outputsDirMethod(this, value)
-}
-
-private val outputsFilesMethod by lazy {
-    TaskOutputs::class.java.methods.first {
-        it.name == "files" && it.parameterTypes.contentEquals(arrayOf(Array<Any>::class.java))
-    }
-}
-
-internal fun TaskOutputs.filesCompatible(vararg value: Any) {
-    outputsFilesMethod(this, value)
-}
-
-private val fileMethod by lazy {
-    TaskInputs::class.java.methods.first {
-        it.name == "file" && it.parameterTypes.contentEquals(arrayOf(Any::class.java))
-    }
-}
-
-internal fun TaskInputs.fileCompatible(filePath: Any) {
-    fileMethod(this, filePath)
-}
-
 private val inputsDirMethod by lazy {
     TaskInputs::class.java.methods.first {
         it.name == "dir" && it.parameterTypes.contentEquals(arrayOf(Any::class.java))
@@ -87,16 +46,6 @@ internal fun TaskInputs.dirCompatible(dirPath: Any) {
     inputsDirMethod(this, dirPath)
 }
 
-private val setClassesDirMethod by lazy {
-    SourceSetOutput::class.java.methods.first {
-        it.name == "setClassesDir" && it.parameterTypes.contentEquals(arrayOf(Any::class.java))
-    }
-}
-
-internal fun SourceSetOutput.setClassesDirCompatible(dirPath: Any) {
-    setClassesDirMethod(this, dirPath)
-}
-
 internal fun checkGradleCompatibility(minSupportedVersion: GradleVersion = GradleVersion.version("4.0")) {
     val currentVersion = GradleVersion.current()
     if (currentVersion < minSupportedVersion) {

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/utils/fileUtils.kt

@@ -16,9 +16,6 @@ internal fun File.isJavaFile() =
 internal fun File.isKotlinFile(sourceFilesExtensions: List<String>): Boolean =
     !isJavaFile() && sourceFilesExtensions.any { it.equals(extension, ignoreCase = true) }
 
-internal fun File.isClassFile(): Boolean =
-    extension.equals("class", ignoreCase = true)
-
 internal fun File.relativeOrCanonical(base: File): String =
     relativeToOrNull(base)?.path ?: canonicalPath
 

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/utils/reflectionUtils.kt

@@ -16,20 +16,8 @@
 
 package org.jetbrains.kotlin.gradle.utils
 
-import java.lang.reflect.Field
 import java.lang.reflect.InvocationTargetException
 
-internal fun Class<*>.getDeclaredFieldInHierarchy(name: String): Field? {
-    val inheritanceChain = generateSequence(this) { it.superclass }
-    return inheritanceChain.map {
-        try {
-            it.getDeclaredField(name)
-        } catch (_: NoSuchFieldException) {
-            null
-        }
-    }.filterNotNull().first()
-}
-
 internal inline fun <T> checkedReflection(block: () -> T, onReflectionException: (Exception) -> T): T {
     return try {
         block()