[JS IR] support new Ir2Js in tests and in K2JsTranslator

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -176,6 +176,9 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xir-per-file", description = "Splits generated .js per-file")
     var irPerFile: Boolean by FreezableVar(false)
 
+    @Argument(value = "-Xir-new-ir2js", description = "New fragment-based ir2js")
+    var irNewIr2Js: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xinclude",
         valueDescription = "<path>",

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt

@@ -43,6 +43,7 @@ import org.jetbrains.kotlin.ir.backend.js.ic.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
 import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer
+import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformerTmp
 import org.jetbrains.kotlin.ir.declarations.persistent.PersistentIrFactory
 import org.jetbrains.kotlin.js.analyzer.JsAnalysisResult
 import org.jetbrains.kotlin.js.config.*
@@ -381,16 +382,29 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
                 granularity = granularity
             )
 
-            val transformer = IrModuleToJsTransformer(
-                ir.context,
-                mainCallArguments,
-                fullJs = true,
-                dceJs = arguments.irDce,
-                multiModule = arguments.irPerModule,
-                relativeRequirePath = false,
-                generateGlobalThisPolyfill = configuration.languageVersionSettings.supportsFeature(LanguageFeature.JsAllowInvalidCharsIdentifiersEscaping)
-            )
-            val compiledModule: CompilerResult = transformer.generateModule(ir.allModules)
+            val compiledModule: CompilerResult = if (arguments.irNewIr2Js) {
+                val transformer = IrModuleToJsTransformerTmp(
+                    ir.context,
+                    mainCallArguments,
+                    fullJs = true,
+                    dceJs = arguments.irDce,
+                    multiModule = arguments.irPerModule,
+                    relativeRequirePath = false,
+                )
+
+                transformer.generateModule(ir.allModules)
+            } else {
+                val transformer = IrModuleToJsTransformer(
+                    ir.context,
+                    mainCallArguments,
+                    fullJs = true,
+                    dceJs = arguments.irDce,
+                    multiModule = arguments.irPerModule,
+                    relativeRequirePath = false
+                )
+
+                transformer.generateModule(ir.allModules)
+            }
 
             messageCollector.report(INFO, "Executable production duration: ${System.currentTimeMillis() - start}ms")
 

compiler/testData/cli/js/jsExtraHelp.out

@@ -19,6 +19,7 @@ where advanced options include:
   -Xir-dce-runtime-diagnostic={log|exception}
                              Enable runtime diagnostics when performing DCE instead of removing declarations
   -Xir-module-name=<name>    Specify a compilation module name for IR backend
+  -Xir-new-ir2js             New fragment-based ir2js
   -Xir-only                  Disables pre-IR backend
   -Xir-per-file              Splits generated .js per-file
   -Xir-per-module            Splits generated .js per-module

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/directives/JsEnvironmentConfigurationDirectives.kt

@@ -234,4 +234,9 @@ object JsEnvironmentConfigurationDirectives : SimpleDirectivesContainer() {
         description = "",
         applicability = DirectiveApplicability.Global
     )
+
+    val RUN_NEW_IR_2_JS by directive(
+        description = "",
+        applicability = DirectiveApplicability.Global
+    )
 }