Clear outputs before compiling with in-process/out-of-process execution mode

Issue #KT-30492 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/ExecutionStrategyIT.kt

@@ -1,5 +1,6 @@
 package org.jetbrains.kotlin.gradle
 
+import org.jetbrains.kotlin.gradle.util.checkedReplace
 import org.jetbrains.kotlin.gradle.util.getFileByName
 import org.jetbrains.kotlin.gradle.util.modify
 import org.junit.Test
@@ -18,9 +19,29 @@ class ExecutionStrategyJsIT : ExecutionStrategyIT() {
     override fun CompiledProject.checkOutput() {
         assertFileExists("web/js/out.js")
     }
+
+    override fun CompiledProject.checkOutputAfterChange() {
+        assertFileExists("web/js/out.js")
+    }
 }
 
-open class ExecutionStrategyIT : BaseGradleIT() {
+class ExecutionStrategyJvmIT : ExecutionStrategyIT() {
+    override fun CompiledProject.checkOutput() {
+        val classesDir = kotlinClassesDir(subproject = "app") + "foo/"
+        assertFileExists("${classesDir}MainKt.class")
+        assertFileExists("${classesDir}A.class")
+        assertFileExists("${classesDir}B.class")
+    }
+
+    override fun CompiledProject.checkOutputAfterChange() {
+        val classesDir = kotlinClassesDir(subproject = "app") + "foo/"
+        assertFileExists("${classesDir}MainKt.class")
+        assertFileExists("${classesDir}A.class")
+        assertNoSuchFile("${classesDir}B.class")
+    }
+}
+
+abstract class ExecutionStrategyIT : BaseGradleIT() {
     @Test
     fun testDaemon() {
         doTestExecutionStrategy("daemon")
@@ -48,14 +69,18 @@ open class ExecutionStrategyIT : BaseGradleIT() {
             assertContains(finishMessage)
             checkOutput()
             assertNoWarnings()
+            assertFileExists(kotlinClassesDir(subproject = "app") + "foo/B.class")
         }
 
-        val fKt = project.projectDir.getFileByName("f.kt")
-        fKt.delete()
+        val classesKt = project.projectDir.getFileByName("classes.kt")
+        classesKt.modify {
+            it.checkedReplace("class B", "//class B")
+        }
         project.build("build", strategyCLIArg) {
-            assertFailed()
+            assertSuccessful()
             assertContains(finishMessage)
-            assert(output.contains("Unresolved reference: f", ignoreCase = true))
+            checkOutputAfterChange()
+            assertNoWarnings()
         }
     }
 
@@ -66,7 +91,6 @@ open class ExecutionStrategyIT : BaseGradleIT() {
         )
     }
 
-    protected open fun CompiledProject.checkOutput() {
-        assertFileExists(kotlinClassesDir(subproject = "app") + "foo/MainKt.class")
-    }
+    protected abstract fun CompiledProject.checkOutput()
+    protected abstract fun CompiledProject.checkOutputAfterChange()
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinBuiltins/app/src/main/kotlin/classes.kt

@@ -0,0 +1,5 @@
+package foo
+
+class A
+
+class B

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinBuiltins/app/src/main/kotlin/f.kt

@@ -1,4 +0,0 @@
-package foo
-
-@Suppress("unused_parameter")
-fun f(fn: (x: Int)->Unit) { }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinBuiltins/app/src/main/kotlin/main.kt

@@ -1,5 +1,5 @@
 package foo
 
 fun main() {
-    f { it * 2 }
+    A()
 }

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

@@ -15,6 +15,7 @@ import org.jetbrains.kotlin.gradle.plugin.internal.state.TaskExecutionResults
 import org.jetbrains.kotlin.gradle.plugin.internal.state.TaskLoggers
 import org.jetbrains.kotlin.gradle.report.BuildReportMode
 import org.jetbrains.kotlin.gradle.report.TaskExecutionResult
+import org.jetbrains.kotlin.gradle.tasks.clearLocalState
 import org.jetbrains.kotlin.gradle.tasks.throwGradleExceptionIfError
 import org.jetbrains.kotlin.gradle.utils.stackTraceAsString
 import org.jetbrains.kotlin.incremental.ChangedFiles
@@ -292,8 +293,10 @@ internal class GradleKotlinCompilerWork @Inject constructor(
         return result
     }
 
-    private fun compileOutOfProcess(): ExitCode =
-        try {
+    private fun compileOutOfProcess(): ExitCode {
+        clearLocalState(outputFiles, log, reason = "out-of-process execution strategy is non-incremental")
+
+        return try {
             runToolInSeparateProcess(compilerArgs, compilerClassName, compilerFullClasspath, log)
         } finally {
             reportExecutionResultIfNeeded {
@@ -303,17 +306,20 @@ internal class GradleKotlinCompilerWork @Inject constructor(
                 )
             }
         }
+    }
 
     private fun compileInProcess(messageCollector: MessageCollector): ExitCode {
+        clearLocalState(outputFiles, log, reason = "in-process execution strategy is non-incremental")
+
         // in-process compiler should always be run in a different thread
         // to avoid leaking thread locals from compiler (see KT-28037)
         val threadPool = Executors.newSingleThreadExecutor()
         val bufferingMessageCollector = GradleBufferingMessageCollector()
-        try {
+        return try {
             val future = threadPool.submit(Callable {
                 compileInProcessImpl(bufferingMessageCollector)
             })
-            return future.get()
+            future.get()
         } finally {
             bufferingMessageCollector.flush(messageCollector)
             threadPool.shutdown()

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

@@ -2,10 +2,12 @@ package org.jetbrains.kotlin.gradle.tasks
 
 import org.gradle.api.GradleException
 import org.jetbrains.kotlin.cli.common.ExitCode
+import org.jetbrains.kotlin.compilerRunner.KotlinLogger
 import org.jetbrains.kotlin.gradle.logging.GradleKotlinLogger
 import org.jetbrains.kotlin.gradle.internal.tasks.TaskWithLocalState
 import org.jetbrains.kotlin.gradle.internal.tasks.allOutputFiles
 import org.jetbrains.kotlin.gradle.logging.kotlinDebug
+import java.io.File
 
 fun throwGradleExceptionIfError(exitCode: ExitCode) {
     when (exitCode) {
@@ -20,13 +22,16 @@ fun throwGradleExceptionIfError(exitCode: ExitCode) {
 
 internal fun TaskWithLocalState.clearLocalState(reason: String? = null) {
     val log = GradleKotlinLogger(logger)
+    clearLocalState(allOutputFiles(), log, reason)
+}
 
+internal fun clearLocalState(outputFiles: Iterable<File>, log: KotlinLogger, reason: String? = null) {
     log.kotlinDebug {
         val suffix = reason?.let { " ($it)" }.orEmpty()
         "Clearing output$suffix:"
     }
 
-    for (file in allOutputFiles()) {
+    for (file in outputFiles) {
         if (!file.exists()) continue
         when {
             file.isDirectory -> {