[Gradle][MPP] Cache kotlinProjectStructureMetadata for multiplatform projects

GranularMetadataTransformation requires the metadata for dependency
projects, for every given source set multiple times. This lead
to the metadata being built extremely often, causing a significant
bottleneck during import.

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/KotlinMultiplatformPlugin.kt

@@ -126,7 +126,7 @@ class KotlinMultiplatformPlugin : Plugin<Project> {
 
         project.pluginManager.apply(ScriptingGradleSubplugin::class.java)
 
-        exportProjectStructureMetadataForOtherBuilds(project)
+        exportProjectStructureMetadataForOtherBuilds(kotlinMultiplatformExtension)
 
         SingleActionPerBuild.run(project.rootProject, "cleanup-processed-metadata") {
             if (isConfigurationCacheAvailable(project.gradle)) {
@@ -148,10 +148,10 @@ class KotlinMultiplatformPlugin : Plugin<Project> {
     }
 
     private fun exportProjectStructureMetadataForOtherBuilds(
-        project: Project
+        extension: KotlinMultiplatformExtension
     ) {
-        GlobalProjectStructureMetadataStorage.registerProjectStructureMetadata(project) {
+        GlobalProjectStructureMetadataStorage.registerProjectStructureMetadata(extension.project) {
-            checkNotNull(buildKotlinProjectStructureMetadata(project))
+            extension.kotlinProjectStructureMetadata
         }
     }
 

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/KotlinProjectStructureMetadata.kt

@@ -13,7 +13,7 @@ import org.gradle.api.Project
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.Internal
 import org.gradle.api.tasks.Nested
-import org.jetbrains.kotlin.gradle.dsl.multiplatformExtensionOrNull
+import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
 import org.jetbrains.kotlin.gradle.plugin.mpp.pm20.GradleKpmModule
 import org.jetbrains.kotlin.gradle.plugin.mpp.pm20.hasKpmModel
 import org.jetbrains.kotlin.gradle.plugin.sources.KotlinDependencyScope
@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.gradle.targets.metadata.dependsOnClosureWithInterCom
 import org.jetbrains.kotlin.gradle.targets.metadata.getPublishedPlatformCompilations
 import org.jetbrains.kotlin.gradle.targets.metadata.isSharedNativeSourceSet
 import org.jetbrains.kotlin.gradle.targets.native.internal.CInteropCommonizerCompositeMetadataJarBundling.cinteropMetadataDirectoryPath
+import org.jetbrains.kotlin.gradle.utils.getOrPut
 import org.w3c.dom.Document
 import org.w3c.dom.Element
 import org.w3c.dom.Node
@@ -138,13 +139,19 @@ data class KotlinProjectStructureMetadata(
     }
 }
 
-internal fun buildKotlinProjectStructureMetadata(project: Project): KotlinProjectStructureMetadata? {
+internal val KotlinMultiplatformExtension.kotlinProjectStructureMetadata: KotlinProjectStructureMetadata
-    require(!project.hasKpmModel) { "this function only works with the stable plugin" }
+    get() = project.extensions.extraProperties.getOrPut("org.jetbrains.kotlin.gradle.plugin.mpp.kotlinProjectStructureMetadata") {
+        buildKotlinProjectStructureMetadata(this)
+    }
 
-    val sourceSetsWithMetadataCompilations =
+private fun buildKotlinProjectStructureMetadata(extension: KotlinMultiplatformExtension): KotlinProjectStructureMetadata {
-        project.multiplatformExtensionOrNull?.targets?.getByName(KotlinMultiplatformPlugin.METADATA_TARGET_NAME)?.compilations?.associate {
+    val project = extension.project
-            it.defaultSourceSet to it
+    require(!project.hasKpmModel) { "this function only works with the stable plugin" }
-        } ?: return null
+    require(project.state.executed) { "Cannot build 'KotlinProjectStructureMetadata' during project configuration phase" }
+
+    val sourceSetsWithMetadataCompilations = extension.targets
+        .getByName(KotlinMultiplatformPlugin.METADATA_TARGET_NAME)
+        .compilations.associateBy { it.defaultSourceSet }
 
     val publishedVariantsNamesWithCompilation = getPublishedPlatformCompilations(project).mapKeys { it.key.name }
 

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/MppDependencyProjectStructureMetadataExtractor.kt

@@ -8,8 +8,8 @@ package org.jetbrains.kotlin.gradle.plugin.mpp
 import org.gradle.api.Project
 import org.gradle.api.artifacts.component.ProjectComponentIdentifier
 import org.gradle.api.artifacts.result.ResolvedComponentResult
+import org.jetbrains.kotlin.gradle.dsl.multiplatformExtensionOrNull
 import org.jetbrains.kotlin.gradle.dsl.topLevelExtensionOrNull
-import org.jetbrains.kotlin.gradle.plugin.mpp.pm20.KotlinPm20ProjectExtension
 import org.jetbrains.kotlin.gradle.plugin.mpp.pm20.hasKpmModel
 import org.jetbrains.kotlin.gradle.plugin.mpp.pm20.kpmModules
 import org.jetbrains.kotlin.project.model.KpmModuleIdentifier
@@ -35,7 +35,8 @@ internal class ProjectMppDependencyProjectStructureMetadataExtractor(
             dependencyProject.hasKpmModel -> buildProjectStructureMetadata(
                 dependencyProject.kpmModules.single { it.moduleIdentifier == moduleIdentifier }
             )
-            else -> buildKotlinProjectStructureMetadata(dependencyProject)
+
+            else -> dependencyProject.multiplatformExtensionOrNull?.kotlinProjectStructureMetadata
         }
     }
 }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/metadata/KotlinMetadataTargetConfigurator.kt

@@ -496,7 +496,7 @@ internal fun Project.createGenerateProjectStructureMetadataTask(module: GradleKp
 
 internal fun Project.createGenerateProjectStructureMetadataTask(): TaskProvider<GenerateProjectStructureMetadata> =
     project.registerTask(lowerCamelCaseName("generateProjectStructureMetadata")) { task ->
-        task.lazyKotlinProjectStructureMetadata = lazy { checkNotNull(buildKotlinProjectStructureMetadata(project)) }
+        task.lazyKotlinProjectStructureMetadata = lazy { project.multiplatformExtension.kotlinProjectStructureMetadata }
     }
 
 internal interface ResolvedMetadataFilesProvider {

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/JvmAndAndroidIntermediateSourceSetTest.kt

@@ -3,8 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-/* Associate compilations are not yet supported by the IDE. KT-34102 */
+@file:Suppress("FunctionName")
-@file:Suppress("invisible_reference", "invisible_member", "FunctionName", "DuplicatedCode")
 
 package org.jetbrains.kotlin.gradle
 
@@ -17,7 +16,7 @@ import org.jetbrains.kotlin.gradle.dsl.multiplatformExtension
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinAndroidTarget
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMetadataCompilation
-import org.jetbrains.kotlin.gradle.plugin.mpp.buildKotlinProjectStructureMetadata
+import org.jetbrains.kotlin.gradle.plugin.mpp.kotlinProjectStructureMetadata
 import kotlin.test.*
 
 class JvmAndAndroidIntermediateSourceSetTest {
@@ -81,7 +80,7 @@ class JvmAndAndroidIntermediateSourceSetTest {
     @Test
     fun `KotlinProjectStructureMetadata jvmAndAndroidMain exists in jvm variants`() {
         project.evaluate()
-        val metadata = assertNotNull(buildKotlinProjectStructureMetadata(project))
+        val metadata = kotlin.kotlinProjectStructureMetadata
         assertTrue("jvmAndAndroidMain" in metadata.sourceSetNamesByVariantName["jvmApiElements"].orEmpty())
         assertTrue("jvmAndAndroidMain" in metadata.sourceSetNamesByVariantName["jvmRuntimeElements"].orEmpty())
     }
@@ -89,7 +88,7 @@ class JvmAndAndroidIntermediateSourceSetTest {
     @Test
     fun `KotlinProjectStructureMetadata jvmAndAndroidMain exists in android variants`() {
         project.evaluate()
-        val metadata = assertNotNull(buildKotlinProjectStructureMetadata(project))
+        val metadata = kotlin.kotlinProjectStructureMetadata
         assertTrue("jvmAndAndroidMain" in metadata.sourceSetNamesByVariantName["debugApiElements"].orEmpty())
         assertTrue("jvmAndAndroidMain" in metadata.sourceSetNamesByVariantName["debugRuntimeElements"].orEmpty())
         assertTrue("jvmAndAndroidMain" in metadata.sourceSetNamesByVariantName["releaseApiElements"].orEmpty())

libraries/tools/kotlin-tooling-metadata/src/main/kotlin/org/jetbrains/kotlin/tooling/KotlinToolingMetadata.kt

@@ -72,5 +72,3 @@ data class KotlinToolingMetadata(
         const val currentSchemaVersion: String = "1.1.0"
     }
 }
-
-