Extension points for serialization plugin in JS translator:

* Plugins for JS CLI compiler now can be loaded via -XPlugin option
* New extension point in project
* JS translator modified to accept synthetic declarations and call
 extension.
* Some functions made public to create a small API

compiler/cli/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java

@@ -43,6 +43,7 @@ import org.jetbrains.kotlin.cli.common.messages.MessageUtil;
 import org.jetbrains.kotlin.cli.common.output.outputUtils.OutputUtilsKt;
 import org.jetbrains.kotlin.cli.jvm.compiler.EnvironmentConfigFiles;
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment;
+import org.jetbrains.kotlin.cli.jvm.plugins.PluginCliParser;
 import org.jetbrains.kotlin.config.*;
 import org.jetbrains.kotlin.incremental.components.LookupTracker;
 import org.jetbrains.kotlin.incremental.js.TranslationResultValue;
@@ -167,6 +168,9 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments> {
             return COMPILATION_ERROR;
         }
 
+        ExitCode plugLoadResult = PluginCliParser.loadPluginsSafe(arguments, configuration);
+        if (plugLoadResult != ExitCode.OK) return plugLoadResult;
+
         configuration.put(JSConfigurationKeys.LIBRARIES, configureLibraries(arguments, paths, messageCollector));
 
         ContentRootsKt.addKotlinSourceRoots(configuration, arguments.getFreeArgs());

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/K2JVMCompiler.kt

@@ -69,22 +69,8 @@ class K2JVMCompiler : CLICompiler<K2JVMCompilerArguments>() {
             if (it != OK) return it
         }
 
-        try {
-            PluginCliParser.loadPlugins(arguments, configuration)
-        }
-        catch (e: PluginCliOptionProcessingException) {
-            val message = e.message + "\n\n" + cliPluginUsageString(e.pluginId, e.options)
-            messageCollector.report(ERROR, message)
-            return INTERNAL_ERROR
-        }
-        catch (e: CliOptionProcessingException) {
-            messageCollector.report(ERROR, e.message!!)
-            return INTERNAL_ERROR
-        }
-        catch (t: Throwable) {
-            MessageCollectorUtil.reportException(messageCollector, t)
-            return INTERNAL_ERROR
-        }
+        val plugLoadResult = PluginCliParser.loadPluginsSafe(arguments, configuration)
+        if (plugLoadResult != ExitCode.OK) return plugLoadResult
 
         if (!arguments.script && arguments.buildFile == null) {
             for (arg in arguments.freeArgs) {

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/KotlinCoreEnvironment.kt

@@ -89,6 +89,7 @@ import org.jetbrains.kotlin.extensions.DeclarationAttributeAltererExtension
 import org.jetbrains.kotlin.extensions.PreprocessedVirtualFileFactoryExtension
 import org.jetbrains.kotlin.extensions.StorageComponentContainerContributor
 import org.jetbrains.kotlin.idea.KotlinFileType
+import org.jetbrains.kotlin.js.translate.extensions.JsSyntheticTranslateExtension
 import org.jetbrains.kotlin.load.kotlin.KotlinBinaryClassCache
 import org.jetbrains.kotlin.load.kotlin.MetadataFinderFactory
 import org.jetbrains.kotlin.load.kotlin.ModuleVisibilityManager
@@ -165,6 +166,7 @@ class KotlinCoreEnvironment private constructor(
         StorageComponentContainerContributor.registerExtensionPoint(project)
         DeclarationAttributeAltererExtension.registerExtensionPoint(project)
         PreprocessedVirtualFileFactoryExtension.registerExtensionPoint(project)
+        JsSyntheticTranslateExtension.registerExtensionPoint(project)
 
         for (registrar in configuration.getList(ComponentRegistrar.PLUGIN_COMPONENT_REGISTRARS)) {
             registrar.registerProjectComponents(project, configuration)

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/plugins/PluginCliParser.kt

@@ -17,7 +17,11 @@
 package org.jetbrains.kotlin.cli.jvm.plugins
 
 import com.intellij.util.containers.MultiMap
+import org.jetbrains.kotlin.cli.common.CLIConfigurationKeys
+import org.jetbrains.kotlin.cli.common.ExitCode
 import org.jetbrains.kotlin.cli.common.arguments.CommonCompilerArguments
+import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity
+import org.jetbrains.kotlin.cli.common.messages.MessageCollectorUtil
 import org.jetbrains.kotlin.cli.jvm.BundledCompilerPlugins
 import org.jetbrains.kotlin.compiler.plugin.*
 import org.jetbrains.kotlin.config.CompilerConfiguration
@@ -26,6 +30,30 @@ import java.net.URL
 import java.util.*
 
 object PluginCliParser {
+
+    @JvmStatic
+    fun loadPluginsSafe(arguments: CommonCompilerArguments, configuration: CompilerConfiguration): ExitCode {
+        val messageCollector = configuration.getNotNull(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY)
+
+        try {
+            PluginCliParser.loadPlugins(arguments, configuration)
+        }
+        catch (e: PluginCliOptionProcessingException) {
+            val message = e.message + "\n\n" + cliPluginUsageString(e.pluginId, e.options)
+            messageCollector.report(CompilerMessageSeverity.ERROR, message)
+            return ExitCode.INTERNAL_ERROR
+        }
+        catch (e: CliOptionProcessingException) {
+            messageCollector.report(CompilerMessageSeverity.ERROR, e.message!!)
+            return ExitCode.INTERNAL_ERROR
+        }
+        catch (t: Throwable) {
+            MessageCollectorUtil.reportException(messageCollector, t)
+            return ExitCode.INTERNAL_ERROR
+        }
+        return ExitCode.OK
+    }
+
     @JvmStatic
     fun loadPlugins(arguments: CommonCompilerArguments, configuration: CompilerConfiguration) {
         val classLoader = PluginURLClassLoader(