JVM IR: fix visibility/modality of $suspendImpl methods

#KT-43614 Fixed

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/AddContinuationLowering.kt

@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.backend.jvm.localDeclarationsPhase
 import org.jetbrains.kotlin.codegen.coroutines.*
 import org.jetbrains.kotlin.codegen.inline.coroutines.FOR_INLINE_SUFFIX
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.*
@@ -208,10 +209,8 @@ private class AddContinuationLowering(context: JvmBackendContext) : SuspendLower
         }
     }
 
-    private fun Name.toSuspendImplementationName() = when {
-        isSpecial -> Name.special(asString() + SUSPEND_IMPL_NAME_SUFFIX)
-        else -> Name.identifier(asString() + SUSPEND_IMPL_NAME_SUFFIX)
-    }
+    private fun Name.toSuspendImplementationName(): Name =
+        Name.guessByFirstCharacter(asString() + SUSPEND_IMPL_NAME_SUFFIX)
 
     private fun createStaticSuspendImpl(irFunction: IrSimpleFunction): IrSimpleFunction {
         // Create static suspend impl method.
@@ -220,6 +219,8 @@ private class AddContinuationLowering(context: JvmBackendContext) : SuspendLower
             irFunction.name.toSuspendImplementationName(),
             irFunction,
             origin = JvmLoweredDeclarationOrigin.SUSPEND_IMPL_STATIC_FUNCTION,
+            modality = Modality.OPEN,
+            visibility = JavaDescriptorVisibilities.PACKAGE_VISIBILITY,
             isFakeOverride = false,
             copyMetadata = false
         )

compiler/testData/codegen/bytecodeListing/coroutines/suspendImpl.kt

@@ -0,0 +1,5 @@
+abstract class A {
+    public open suspend fun public() {}
+    protected open suspend fun protected() {}
+    internal open suspend fun internal() {}
+}

compiler/testData/codegen/bytecodeListing/coroutines/suspendImpl.txt

@@ -0,0 +1,11 @@
+@kotlin.Metadata
+public abstract class A {
+    // source: 'suspendImpl.kt'
+    public method <init>(): void
+    synthetic static method internal$test_module$suspendImpl(p0: A, p1: java.lang.Object): java.lang.Object
+    public @org.jetbrains.annotations.Nullable method internal$test_module(@org.jetbrains.annotations.Nullable p0: java.lang.Object): java.lang.Object
+    synthetic static method protected$suspendImpl(p0: A, p1: java.lang.Object): java.lang.Object
+    protected @org.jetbrains.annotations.Nullable method protected(@org.jetbrains.annotations.Nullable p0: java.lang.Object): java.lang.Object
+    synthetic static method public$suspendImpl(p0: A, p1: java.lang.Object): java.lang.Object
+    public @org.jetbrains.annotations.Nullable method public(@org.jetbrains.annotations.Nullable p0: java.lang.Object): java.lang.Object
+}

compiler/testData/codegen/bytecodeListing/coroutines/suspendImpl_ir.txt

@@ -0,0 +1,11 @@
+@kotlin.Metadata
+public abstract class A {
+    // source: 'suspendImpl.kt'
+    public method <init>(): void
+    synthetic static method internal$suspendImpl(p0: A, p1: kotlin.coroutines.Continuation): java.lang.Object
+    public @org.jetbrains.annotations.Nullable method internal$test_module(@org.jetbrains.annotations.NotNull p0: kotlin.coroutines.Continuation): java.lang.Object
+    synthetic static method protected$suspendImpl(p0: A, p1: kotlin.coroutines.Continuation): java.lang.Object
+    protected @org.jetbrains.annotations.Nullable method protected(@org.jetbrains.annotations.NotNull p0: kotlin.coroutines.Continuation): java.lang.Object
+    synthetic static method public$suspendImpl(p0: A, p1: kotlin.coroutines.Continuation): java.lang.Object
+    public @org.jetbrains.annotations.Nullable method public(@org.jetbrains.annotations.NotNull p0: kotlin.coroutines.Continuation): java.lang.Object
+}

compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java

@@ -697,6 +697,11 @@ public class BytecodeListingTestGenerated extends AbstractBytecodeListingTest {
             runTest("compiler/testData/codegen/bytecodeListing/coroutines/privateSuspendFun.kt");
         }
 
+        @TestMetadata("suspendImpl.kt")
+        public void testSuspendImpl() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeListing/coroutines/suspendImpl.kt");
+        }
+
         @TestMetadata("suspendReifiedFun.kt")
         public void testSuspendReifiedFun_1_2() throws Exception {
             runTestWithPackageReplacement("compiler/testData/codegen/bytecodeListing/coroutines/suspendReifiedFun.kt", "kotlin.coroutines.experimental");

compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java

@@ -677,6 +677,11 @@ public class IrBytecodeListingTestGenerated extends AbstractIrBytecodeListingTes
             runTest("compiler/testData/codegen/bytecodeListing/coroutines/privateSuspendFun.kt");
         }
 
+        @TestMetadata("suspendImpl.kt")
+        public void testSuspendImpl() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeListing/coroutines/suspendImpl.kt");
+        }
+
         @TestMetadata("suspendReifiedFun.kt")
         public void testSuspendReifiedFun_1_3() throws Exception {
             runTestWithPackageReplacement("compiler/testData/codegen/bytecodeListing/coroutines/suspendReifiedFun.kt", "kotlin.coroutines");