[JS IR BE] Support @JsName in bridges

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/DeclarationOrigins.kt

@@ -14,4 +14,5 @@ object JsLoweredDeclarationOrigin : IrDeclarationOrigin {
     object JS_INTRINSICS_STUB : IrDeclarationOriginImpl("JS_INTRINSICS_STUB")
     object JS_CLOSURE_BOX_CLASS : IrStatementOriginImpl("JS_CLOSURE_BOX_CLASS")
     object JS_CLOSURE_BOX_CLASS_DECLARATION : IrDeclarationOriginImpl("JS_CLOSURE_BOX_CLASS_DECLARATION")
+    object BRIDGE_TO_EXTERNAL_FUNCTION : IrDeclarationOriginImpl("BRIDGE_TO_EXTERNAL_FUNCTION")
 }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/BridgesConstruction.kt

@@ -15,10 +15,11 @@ import org.jetbrains.kotlin.backend.common.ir.isSuspend
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.common.lower.irBlockBody
 import org.jetbrains.kotlin.descriptors.Modality
-import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
+import org.jetbrains.kotlin.ir.backend.js.JsLoweredDeclarationOrigin
 import org.jetbrains.kotlin.ir.backend.js.ir.JsIrBuilder
 import org.jetbrains.kotlin.ir.backend.js.utils.asString
+import org.jetbrains.kotlin.ir.backend.js.utils.getJsName
 import org.jetbrains.kotlin.ir.builders.*
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrValueParameterImpl
@@ -26,11 +27,7 @@ import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.classifierOrNull
 import org.jetbrains.kotlin.ir.types.isUnit
-import org.jetbrains.kotlin.ir.util.isInlined
-import org.jetbrains.kotlin.ir.util.isInterface
-import org.jetbrains.kotlin.ir.util.isReal
-import org.jetbrains.kotlin.ir.util.parentAsClass
-import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 
 // Constructs bridges for inherited generic functions
@@ -82,6 +79,11 @@ class BridgesConstruction(val context: JsIrBackendContext) : ClassLoweringPass {
                 continue
             }
 
+            if (from.function.correspondingProperty != null && from.function.isEffectivelyExternal()) {
+                // TODO: Revisit bridges from external properties
+                continue
+            }
+
             irClass.declarations.add(createBridge(function, from.function, to.function))
         }
     }
@@ -95,6 +97,12 @@ class BridgesConstruction(val context: JsIrBackendContext) : ClassLoweringPass {
         delegateTo: IrSimpleFunction
     ): IrFunction {
 
+        val origin =
+            if (bridge.isEffectivelyExternal())
+                JsLoweredDeclarationOrigin.BRIDGE_TO_EXTERNAL_FUNCTION
+            else
+                IrDeclarationOrigin.BRIDGE
+
         // TODO: Support offsets for debug info
         val irFunction = JsIrBuilder.buildFunction(
             bridge.name,
@@ -106,7 +114,7 @@ class BridgesConstruction(val context: JsIrBackendContext) : ClassLoweringPass {
             bridge.isExternal,
             bridge.isTailrec,
             bridge.isSuspend,
-            IrDeclarationOrigin.BRIDGE
+            origin
         ).apply {
 
             // TODO: should dispatch receiver be copied?
@@ -180,20 +188,25 @@ class FunctionAndSignature(val function: IrSimpleFunction) {
     // Currently strings are used for compatibility with a hack-based name generator
 
     private data class Signature(
-        val name: Name,
-        val extensionReceiverType: String?,
-        val valueParameters: List<String?>,
-        val returnType: String?
+        val name: String,
+        val extensionReceiverType: String? = null,
+        val valueParameters: List<String?> = emptyList(),
+        val returnType: String? = null
     )
 
-    private val signature = Signature(
-        function.name,
-        function.extensionReceiverParameter?.type?.asString(),
-        function.valueParameters.map { it.type.asString() },
-        // Return type used in signature for inline classes only because
-        // they are binary incompatible with supertypes and require bridges.
-        function.returnType.run { if (isInlined()) asString() else null }
-    )
+    private val jsName = function.getJsName()
+    private val signature = when {
+        jsName != null -> Signature(jsName)
+        function.isEffectivelyExternal() -> Signature(function.name.asString())
+        else -> Signature(
+            function.name.asString(),
+            function.extensionReceiverParameter?.type?.asString(),
+            function.valueParameters.map { it.type.asString() },
+            // Return type used in signature for inline classes only because
+            // they are binary incompatible with supertypes and require bridges.
+            function.returnType.run { if (isInlined()) asString() else null }
+        )
+    }
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/SimpleNameGenerator.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.ir.backend.js.utils
 
 import org.jetbrains.kotlin.backend.common.ir.isTopLevel
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.ir.backend.js.JsLoweredDeclarationOrigin
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.IrLoop
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
@@ -106,6 +107,10 @@ class SimpleNameGenerator : NameGenerator {
                 return@getOrPut context.currentScope.declareName(jsName)
             }
 
+            if (declaration is IrSimpleFunction && declaration.origin == JsLoweredDeclarationOrigin.BRIDGE_TO_EXTERNAL_FUNCTION) {
+                return@getOrPut context.staticContext.rootScope.declareName(declaration.name.identifier)
+            }
+
             if (declaration.isEffectivelyExternal()) {
                 // TODO: descriptors are still used here due to the corresponding declaration doesn't have enough information yet
                 val descriptorName = when (descriptor) {

compiler/testData/codegen/box/bridges/jsName.kt

@@ -54,7 +54,9 @@ fun box(): String {
     val dd: dynamic = E()
     assertEquals("D.foo(42)", dd.foo(42))
     assertEquals("D.foo(99)", dd.bar(99))
-    assertEquals("D.foo(88)", dd.`foo_za3lpa$`(88))
+    if (testUtils.isLegacyBackend()) {
+        assertEquals("D.foo(88)", dd.`foo_za3lpa$`(88))
+    }
 
     return "OK"
 }

compiler/testData/codegen/box/bridges/jsNative.kt

@@ -29,7 +29,9 @@ fun box(): String {
 
     val d: dynamic = C()
     assertEquals("C.foo(42)", d.foo(42))
-    assertEquals("C.foo(99)", d.`foo_za3lpa$`(99))
+    if (testUtils.isLegacyBackend()) {
+        assertEquals("C.foo(99)", d.`foo_za3lpa$`(99))
+    }
 
     val da: A = E()
     assertEquals("D.foo(55)", da.foo(55))
@@ -39,7 +41,10 @@ fun box(): String {
 
     val dd: dynamic = E()
     assertEquals("D.foo(42)", dd.foo(42))
-    assertEquals("D.foo(99)", dd.`foo_za3lpa$`(99))
+
+    if (testUtils.isLegacyBackend()) {
+        assertEquals("D.foo(99)", dd.`foo_za3lpa$`(99))
+    }
 
     return "OK"
 }

js/js.translator/testData/box/propertyAccess/subclassAccessorsWithJsNameInSuper.kt

@@ -1,6 +1,5 @@
 // IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1303
-package foo
 
 open class A {
     open val x: Int
@@ -30,7 +29,7 @@ class B : A(), C {
     override val z = 55
 }
 
-fun getPackage() = js("return JS_TESTS.foo")
+fun getPackage() = js("JS_TESTS")
 
 fun box(): String {
     val a = B()