[JS IR] Generate main method call only for main module

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrModuleToJsTransformer.kt

@@ -96,7 +96,8 @@ class IrModuleToJsTransformer(
                 others,
                 exportedModule,
                 namer,
-                refInfo
+                refInfo,
+                generateMainCall = true
             )
 
             val dependencies = others.mapIndexed { index, module ->
@@ -109,7 +110,8 @@ class IrModuleToJsTransformer(
                     others.drop(index + 1),
                     ExportedModule(moduleName, exportedModule.moduleKind, exportedDeclarations),
                     namer,
-                    refInfo
+                    refInfo,
+                    generateMainCall = false
                 )
             }.reversed()
 
@@ -130,7 +132,8 @@ class IrModuleToJsTransformer(
         dependencies: Iterable<IrModuleFragment>,
         exportedModule: ExportedModule,
         namer: NameTables,
-        refInfo: CrossModuleReferenceInfo
+        refInfo: CrossModuleReferenceInfo,
+        generateMainCall: Boolean = true
     ): CompilationOutputs {
 
         val nameGenerator = refInfo.withReferenceTracking(
@@ -161,8 +164,6 @@ class IrModuleToJsTransformer(
         val globalNames = NameTable<String>(namer.globalNames)
         val exportStatements = ExportModelToJsStatements(internalModuleName, nameGenerator, { globalNames.declareFreshName(it, it)}).generateModuleExport(exportedModule)
 
-        val callToMain = generateCallToMain(modules, rootContext)
-
         val (crossModuleImports, importedKotlinModules) = generateCrossModuleImports(nameGenerator, modules, dependencies, { JsName(sanitizeName(it)) })
         val crossModuleExports = generateCrossModuleExports(modules, refInfo, internalModuleName)
 
@@ -181,7 +182,9 @@ class IrModuleToJsTransformer(
                     statements.addWithComment("block: imports", importStatements + crossModuleImports)
                     statements += moduleBody
                     statements.addWithComment("block: exports", exportStatements + crossModuleExports)
-                    statements += callToMain
+                    if (generateMainCall) {
+                        statements += generateCallToMain(modules, rootContext)
+                    }
                     statements += JsReturn(internalModuleName.makeRef())
                 }
             }

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java

@@ -880,6 +880,11 @@ public class IrBoxJsES6TestGenerated extends AbstractIrBoxJsES6Test {
             runTest("js/js.translator/testData/box/crossModuleRefIR/objectIsObject.kt");
         }
 
+        @TestMetadata("onlyMainModuleCall.kt")
+        public void testOnlyMainModuleCall() throws Exception {
+            runTest("js/js.translator/testData/box/crossModuleRefIR/onlyMainModuleCall.kt");
+        }
+
         @TestMetadata("topLevelExtension.kt")
         public void testTopLevelExtension() throws Exception {
             runTest("js/js.translator/testData/box/crossModuleRefIR/topLevelExtension.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java

@@ -880,6 +880,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
             runTest("js/js.translator/testData/box/crossModuleRefIR/objectIsObject.kt");
         }
 
+        @TestMetadata("onlyMainModuleCall.kt")
+        public void testOnlyMainModuleCall() throws Exception {
+            runTest("js/js.translator/testData/box/crossModuleRefIR/onlyMainModuleCall.kt");
+        }
+
         @TestMetadata("topLevelExtension.kt")
         public void testTopLevelExtension() throws Exception {
             runTest("js/js.translator/testData/box/crossModuleRefIR/topLevelExtension.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -880,6 +880,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             runTest("js/js.translator/testData/box/crossModuleRefIR/objectIsObject.kt");
         }
 
+        @TestMetadata("onlyMainModuleCall.kt")
+        public void testOnlyMainModuleCall() throws Exception {
+            runTest("js/js.translator/testData/box/crossModuleRefIR/onlyMainModuleCall.kt");
+        }
+
         @TestMetadata("topLevelExtension.kt")
         public void testTopLevelExtension() throws Exception {
             runTest("js/js.translator/testData/box/crossModuleRefIR/topLevelExtension.kt");

js/js.translator/testData/box/crossModuleRefIR/onlyMainModuleCall.kt

@@ -0,0 +1,30 @@
+// IGNORE_BACKEND: JS
+// SPLIT_PER_MODULE
+// CALL_MAIN
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+var log: String = ""
+
+val hack = ::main
+
+fun main() {
+    log += "fail"
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+import lib.*
+
+fun main() {
+    log += "OK"
+}
+
+fun box(): String {
+    return log
+}