JPS: provide SourcesPreprocessor extension point

jps-plugin/src/org/jetbrains/kotlin/jps/targets/KotlinJvmModuleBuildTarget.kt

@@ -17,6 +17,7 @@ import org.jetbrains.jps.builders.storage.BuildDataPaths
 import org.jetbrains.jps.incremental.*
 import org.jetbrains.jps.model.java.JpsJavaExtensionService
 import org.jetbrains.jps.model.module.JpsSdkDependency
+import org.jetbrains.jps.service.JpsServiceManager
 import org.jetbrains.kotlin.build.GeneratedFile
 import org.jetbrains.kotlin.build.GeneratedJvmClass
 import org.jetbrains.kotlin.build.JvmBuildMetaInfo
@@ -186,13 +187,16 @@ class KotlinJvmModuleBuildTarget(kotlinContext: KotlinCompileContext, jpsModuleB
             }
 
             val kotlinModuleId = target.targetId
+            val allFiles = sources.allFiles
+            val commonSourceFiles = sources.crossCompiledFiles
+
             builder.addModule(
                 kotlinModuleId.name,
                 outputDir.absolutePath,
-                sources.allFiles,
+                preprocessSources(allFiles),
                 target.findSourceRoots(dirtyFilesHolder.context),
                 target.findClassPathRoots(),
-                sources.crossCompiledFiles,
+                preprocessSources(commonSourceFiles),
                 target.findModularJdkRoot(),
                 kotlinModuleId.type,
                 isTests,
@@ -209,6 +213,28 @@ class KotlinJvmModuleBuildTarget(kotlinContext: KotlinCompileContext, jpsModuleB
         return scriptFile
     }
 
+    /**
+     * Internal API for source level code preprocessors.
+     *
+     * Currently used in https://plugins.jetbrains.com/plugin/13355-spot-profiler-for-java
+     */
+    interface SourcesPreprocessor {
+        /**
+         * Preprocess some sources and return path to the resulting file.
+         * This function should be pure and should return the same output for given input
+         * (required for incremental compilation).
+         */
+        fun preprocessSources(srcFiles: List<File>): List<File>
+    }
+
+    fun preprocessSources(srcFiles: List<File>): List<File> {
+        var result = srcFiles
+        JpsServiceManager.getInstance().getExtensions(SourcesPreprocessor::class.java).forEach {
+            result = it.preprocessSources(result)
+        }
+        return result
+    }
+
     private fun createTempFileForChunkModuleDesc(): File {
         val readableSuffix = buildString {
             append(StringUtil.sanitizeJavaIdentifier(chunk.representativeTarget.module.name))