[K/N] XCTest support: Make compiler produce bundles

XCTest test binary is a bundle plug-in that is similar to a framework.
This is a part of ^KT-58928

Merge-request: KT-MR-10662
Merged-by: Pavel Punegov <Pavel.Punegov@jetbrains.com>

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/CompilerOutput.kt

@@ -25,6 +25,7 @@ val KonanConfig.isFinalBinary: Boolean get() = when (this.produce) {
     CompilerOutputKind.DYNAMIC_CACHE, CompilerOutputKind.STATIC_CACHE,
     CompilerOutputKind.LIBRARY, CompilerOutputKind.BITCODE -> false
     CompilerOutputKind.FRAMEWORK -> !omitFrameworkBinary
+    CompilerOutputKind.TEST_BUNDLE -> true
     else -> error("not supported: ${this.produce}")
 }
 

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Linker.kt

@@ -18,6 +18,7 @@ internal fun determineLinkerOutput(context: PhaseContext): LinkerOutputKind =
                 val staticFramework = context.config.produceStaticFramework
                 if (staticFramework) LinkerOutputKind.STATIC_LIBRARY else LinkerOutputKind.DYNAMIC_LIBRARY
             }
+            CompilerOutputKind.TEST_BUNDLE,
             CompilerOutputKind.DYNAMIC_CACHE,
             CompilerOutputKind.DYNAMIC -> LinkerOutputKind.DYNAMIC_LIBRARY
             CompilerOutputKind.STATIC_CACHE,
@@ -91,31 +92,44 @@ internal class Linker(
         val additionalLinkerArgs: List<String>
         val executable: String
 
-        if (config.produce != CompilerOutputKind.FRAMEWORK) {
-            additionalLinkerArgs = if (target.family.isAppleFamily) {
-                when (config.produce) {
-                    CompilerOutputKind.DYNAMIC_CACHE ->
-                        listOf("-install_name", outputFiles.dynamicCacheInstallName)
-                    else -> listOf("-dead_strip")
+        when (config.produce) {
+            CompilerOutputKind.TEST_BUNDLE -> {
+                val bundleDir = File(outputFile)
+                val name = bundleDir.name.removeSuffix(config.produce.suffix())
+                require(target.family.isAppleFamily)
+                val bundleRelativePath = if (target.family == Family.OSX) "Contents/MacOS/$name" else name
+                additionalLinkerArgs = listOf("-bundle")
+                val bundlePath = bundleDir.child(bundleRelativePath)
+                bundlePath.parentFile.mkdirs()
+                executable = bundlePath.absolutePath
+            }
+            CompilerOutputKind.FRAMEWORK -> {
+                val framework = File(outputFile)
+                val dylibName = framework.name.removeSuffix(".framework")
+                val dylibRelativePath = when (target.family) {
+                    Family.IOS,
+                    Family.TVOS,
+                    Family.WATCHOS -> dylibName
+                    Family.OSX -> "Versions/A/$dylibName"
+                    else -> error(target)
                 }
-            } else {
-                emptyList()
+                additionalLinkerArgs = listOf("-dead_strip", "-install_name", "@rpath/${framework.name}/$dylibRelativePath")
+                val dylibPath = framework.child(dylibRelativePath)
+                dylibPath.parentFile.mkdirs()
+                executable = dylibPath.absolutePath
             }
-            executable = outputFiles.nativeBinaryFile
-        } else {
-            val framework = File(outputFile)
-            val dylibName = framework.name.removeSuffix(".framework")
-            val dylibRelativePath = when (target.family) {
-                Family.IOS,
-                Family.TVOS,
-                Family.WATCHOS -> dylibName
-                Family.OSX -> "Versions/A/$dylibName"
-                else -> error(target)
+            else -> {
+                additionalLinkerArgs = if (target.family.isAppleFamily) {
+                    when (config.produce) {
+                        CompilerOutputKind.DYNAMIC_CACHE ->
+                            listOf("-install_name", outputFiles.dynamicCacheInstallName)
+                        else -> listOf("-dead_strip")
+                    }
+                } else {
+                    emptyList()
+                }
+                executable = outputFiles.nativeBinaryFile
             }
-            additionalLinkerArgs = listOf("-dead_strip", "-install_name", "@rpath/${framework.name}/$dylibRelativePath")
-            val dylibPath = framework.child(dylibRelativePath)
-            dylibPath.parentFile.mkdirs()
-            executable = dylibPath.absolutePath
         }
         File(executable).delete()
 

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/driver/DynamicCompilerDriver.kt

@@ -45,6 +45,7 @@ internal class DynamicCompilerDriver : CompilerDriver() {
                         CompilerOutputKind.DYNAMIC_CACHE -> produceBinary(engine, config, environment)
                         CompilerOutputKind.STATIC_CACHE -> produceBinary(engine, config, environment)
                         CompilerOutputKind.PRELIMINARY_CACHE -> TODO()
+                        CompilerOutputKind.TEST_BUNDLE -> produceBundle(engine, config, environment)
                     }
                 }
             }
@@ -154,6 +155,26 @@ internal class DynamicCompilerDriver : CompilerDriver() {
         }
     }
 
+    /**
+     * Produce a bundle that is a directory with code and resources.
+     * It consists of
+     * - Info.plist
+     * - Binary without an entry point.
+     *
+     * See https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFBundles/AboutBundles/AboutBundles.html
+     */
+    private fun produceBundle(engine: PhaseEngine<PhaseContext>, config: KonanConfig, environment: KotlinCoreEnvironment) {
+        require(config.target.family.isAppleFamily)
+        require(config.produce == CompilerOutputKind.TEST_BUNDLE)
+
+        val frontendOutput = engine.runFrontend(config, environment) ?: return
+        engine.runPhase(CreateTestBundlePhase, frontendOutput)
+        val psiToIrOutput = engine.runPsiToIr(frontendOutput, isProducingLibrary = false)
+        require(psiToIrOutput is PsiToIrOutput.ForBackend)
+        val backendContext = createBackendContext(config, frontendOutput, psiToIrOutput)
+        engine.runBackend(backendContext, psiToIrOutput.irModule)
+    }
+
     private fun createBackendContext(
             config: KonanConfig,
             frontendOutput: FrontendPhaseOutput.Full,

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/driver/phases/BackendPhases.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.backend.konan.driver.phases
 
 import org.jetbrains.kotlin.backend.common.lower
 import org.jetbrains.kotlin.backend.konan.NativeGenerationState
+import org.jetbrains.kotlin.backend.konan.OutputFiles
 import org.jetbrains.kotlin.backend.konan.driver.PhaseContext
 import org.jetbrains.kotlin.backend.konan.driver.PhaseEngine
 import org.jetbrains.kotlin.backend.konan.driver.utilities.KotlinBackendIrHolder
@@ -17,6 +18,7 @@ import org.jetbrains.kotlin.backend.konan.lower.SpecialBackendChecksTraversal
 import org.jetbrains.kotlin.backend.konan.makeEntryPoint
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrFile
+import org.jetbrains.kotlin.backend.konan.objcexport.createTestBundle
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.util.NaiveSourceBasedFileEntryImpl
 import org.jetbrains.kotlin.ir.util.addChild
@@ -87,4 +89,13 @@ internal val EntryPointPhase = createSimpleNamedCompilerPhase<NativeGenerationSt
     }
 
     file.addChild(makeEntryPoint(context))
+}
+
+internal val CreateTestBundlePhase = createSimpleNamedCompilerPhase<PhaseContext, FrontendPhaseOutput.Full>(
+        "CreateTestBundlePhase",
+        "Create XCTest bundle"
+) { context, input ->
+    val config = context.config
+    val output = OutputFiles(config.outputPath, config.target, config.produce).mainFile
+    createTestBundle(config, input.moduleDescriptor, output)
 }

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/BundleBuilder.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2023 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.backend.konan.objcexport
+
+import org.jetbrains.kotlin.backend.konan.KonanConfig
+import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.konan.file.File
+import org.jetbrains.kotlin.konan.target.Family
+
+/**
+ * Builds Apple bundle directory.
+ */
+internal class BundleBuilder(
+        private val config: KonanConfig,
+        private val infoPListBuilder: InfoPListBuilder,
+        private val mainPackageGuesser: MainPackageGuesser,
+) {
+    fun build(
+            moduleDescriptor: ModuleDescriptor,
+            bundleDirectory: File,
+            name: String,
+    ) {
+        val target = config.target
+        val bundleContents = when (target.family) {
+            Family.IOS,
+            Family.WATCHOS,
+            Family.TVOS -> bundleDirectory
+            Family.OSX -> bundleDirectory.child("Contents")
+            else -> error(target)
+        }.apply { mkdirs() }
+
+        bundleContents.child("Info.plist").run {
+            val infoPlistContents = infoPListBuilder.build(name, mainPackageGuesser, moduleDescriptor)
+            writeBytes(infoPlistContents.toByteArray())
+        }
+    }
+}

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExport.kt

@@ -74,7 +74,7 @@ internal fun createObjCFramework(
         exportedInterface: ObjCExportedInterface,
         frameworkDirectory: File
 ) {
-    val frameworkName = frameworkDirectory.name.removeSuffix(".framework")
+    val frameworkName = frameworkDirectory.name.removeSuffix(CompilerOutputKind.FRAMEWORK.suffix())
     val frameworkBuilder = FrameworkBuilder(
             config,
             infoPListBuilder = InfoPListBuilder(config),
@@ -91,6 +91,16 @@ internal fun createObjCFramework(
     )
 }
 
+internal fun createTestBundle(
+        config: KonanConfig,
+        moduleDescriptor: ModuleDescriptor,
+        bundleDirectory: File
+) {
+    val name = bundleDirectory.name.removeSuffix(CompilerOutputKind.TEST_BUNDLE.suffix())
+    BundleBuilder(config, infoPListBuilder = InfoPListBuilder(config), mainPackageGuesser = MainPackageGuesser())
+            .build(moduleDescriptor, bundleDirectory, name)
+}
+
 // TODO: No need for such class in dynamic driver.
 internal class ObjCExport(
         private val generationState: NativeGenerationState,

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

@@ -26,6 +26,9 @@ enum class CompilerOutputKind {
     BITCODE {
         override fun suffix(target: KonanTarget?) = ".bc"
     },
+    TEST_BUNDLE {
+        override fun suffix(target: KonanTarget?): String = ".xctest"
+    },
 
     DYNAMIC_CACHE {
         override fun suffix(target: KonanTarget?) = ".${target!!.family.dynamicSuffix}"