Kapt: support incremental compilation in Gradle (KT-13500)

Kapt will process sources on each step of incremental compilation.
(cherry picked from commit 4cb2127)

plugins/plugins-tests/tests/org/jetbrains/kotlin/annotation/processing/test/processor/AbstractProcessorTest.kt

@@ -21,7 +21,6 @@ import org.jetbrains.kotlin.cli.jvm.compiler.EnvironmentConfigFiles
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
 import org.jetbrains.kotlin.codegen.AbstractBytecodeTextTest
 import org.jetbrains.kotlin.codegen.CodegenTestUtil
-import org.jetbrains.kotlin.java.model.JeName
 import org.jetbrains.kotlin.java.model.elements.JeAnnotationMirror
 import org.jetbrains.kotlin.java.model.elements.JeMethodExecutableElement
 import org.jetbrains.kotlin.java.model.elements.JeTypeElement
@@ -40,13 +39,17 @@ import javax.lang.model.element.*
 
 class AnnotationProcessingExtensionForTests(
         val processors: List<Processor>
-) : AbstractAnnotationProcessingExtension(createTempDir(), createTempDir(), listOf(), true) {
+) : AbstractAnnotationProcessingExtension(createTempDir(), createTempDir(), listOf(), true, createIncrementalDataFile()) {
     override fun loadAnnotationProcessors() = processors
     
     private companion object {
         fun createTempDir(): File = Files.createTempDirectory("ap-test").toFile().apply {
             deleteOnExit()
         }
+        
+        fun createIncrementalDataFile(): File = File.createTempFile("incrementalData", "txt").apply {
+            deleteOnExit()
+        }
     }
 }
 

plugins/plugins-tests/tests/org/jetbrains/kotlin/annotation/processing/test/processor/ProcessorTests.kt

@@ -16,9 +16,11 @@
 
 package org.jetbrains.kotlin.annotation.processing.test.processor
 
+import org.intellij.lang.annotations.Language
 import org.jetbrains.kotlin.java.model.elements.*
 import org.jetbrains.kotlin.java.model.types.JeDeclaredType
 import org.jetbrains.kotlin.java.model.types.JeMethodExecutableTypeMirror
+import org.jetbrains.kotlin.resolve.jvm.extensions.AnalysisCompletedHandlerExtension
 import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstance
 import javax.lang.model.element.AnnotationMirror
 import javax.lang.model.type.DeclaredType
@@ -184,4 +186,18 @@ class ProcessorTests : AbstractProcessorTest() {
         check("g", "<D>(D)void")
         check("g", "(java.lang.String)void", erasure)
     }
+    
+    fun testIncrementalDataSimple() = incrementalDataTest(
+            "IncrementalDataSimple",
+            "i Intf, i Test, i Test2, i Test3, i Test8")
+    
+    private fun incrementalDataTest(fileName: String, @Language("TEXT") expectedText: String) {
+        test(fileName, "Anno", "Anno2", "Anno3") { set, roundEnv, env -> }
+        val ext = AnalysisCompletedHandlerExtension.getInstances(myEnvironment.project)
+                .firstIsInstance<AnnotationProcessingExtensionForTests>()
+        val incrementalDataFile = ext.incrementalDataFile
+        assertNotNull(incrementalDataFile)
+        val text = incrementalDataFile!!.readText().lines().sorted().joinToString(", ")
+        assertEquals(expectedText, text)
+    }
 }