[JVM_IR] Support default interface suspend functions.

Do this by reordering the lowerings so that the lowering that
adds continuations happen after default methods have been
eliminated if needed.

Mark more functions as known to be tail-calls: bridges and
delegated members.

Preserve source info and annotations when creating replacement
functions.

compiler/ir/backend.common/src/org/jetbrains/kotlin/ir/builders/declarations/declarationBuilders.kt

@@ -7,10 +7,8 @@ package org.jetbrains.kotlin.ir.builders.declarations
 
 import org.jetbrains.kotlin.backend.common.descriptors.*
 import org.jetbrains.kotlin.backend.common.ir.copyTo
-import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.*
-import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.descriptors.annotations.Annotations
-import org.jetbrains.kotlin.descriptors.Visibilities
-import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.*
 import org.jetbrains.kotlin.ir.symbols.impl.*
@@ -117,6 +115,8 @@ inline fun IrProperty.addSetter(builder: IrFunctionBuilder.() -> Unit = {}): IrS
 fun IrFunctionBuilder.buildFun(originalDescriptor: FunctionDescriptor? = null): IrFunctionImpl {
     val wrappedDescriptor = if (originalDescriptor is DescriptorWithContainerSource)
         WrappedFunctionDescriptorWithContainerSource(originalDescriptor.containerSource)
+    else if (originalDescriptor != null)
+        WrappedSimpleFunctionDescriptor(originalDescriptor)
     else
         WrappedSimpleFunctionDescriptor()
     return IrFunctionImpl(

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmLower.kt

@@ -217,8 +217,6 @@ private val jvmFilePhases =
         returnableBlocksPhase then
         localDeclarationsPhase then
 
-        addContinuationPhase then
-
         jvmOverloadsAnnotationPhase then
         jvmDefaultConstructorPhase then
 
@@ -235,6 +233,8 @@ private val jvmFilePhases =
         interfaceSuperCallsPhase then
         interfaceDefaultCallsPhase then
 
+        addContinuationPhase then
+
         innerClassesPhase then
         innerClassConstructorCallsPhase then
         forLoopsPhase then

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/CoroutineCodegen.kt

@@ -108,8 +108,16 @@ internal fun IrFunction.isInvokeOfSuspendCallableReference(): Boolean = isSuspen
         (parent as? IrClass)?.origin == JvmLoweredDeclarationOrigin.FUNCTION_REFERENCE_IMPL
 
 internal fun IrFunction.isKnownToBeTailCall(): Boolean =
-    origin == IrDeclarationOrigin.FUNCTION_FOR_DEFAULT_PARAMETER || origin == JvmLoweredDeclarationOrigin.SYNTHETIC_ACCESSOR ||
+    when (origin) {
-            isInvokeOfSuspendCallableReference()
+        IrDeclarationOrigin.FUNCTION_FOR_DEFAULT_PARAMETER,
+        JvmLoweredDeclarationOrigin.SYNTHETIC_ACCESSOR,
+        JvmLoweredDeclarationOrigin.DEFAULT_IMPLS_BRIDGE,
+        JvmLoweredDeclarationOrigin.DEFAULT_IMPLS_BRIDGE_TO_SYNTHETIC,
+        IrDeclarationOrigin.BRIDGE,
+        IrDeclarationOrigin.BRIDGE_SPECIAL,
+        IrDeclarationOrigin.DELEGATED_MEMBER -> true
+        else -> isInvokeOfSuspendCallableReference()
+    }
 
 internal fun IrFunction.shouldNotContainSuspendMarkers(context: JvmBackendContext): Boolean =
     isInvokeSuspendOfContinuation(context) || isKnownToBeTailCall()

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/FunctionCodegen.kt

@@ -78,7 +78,8 @@ open class FunctionCodegen(
             val continuationClassBuilder = context.continuationClassBuilders[irClass]
             methodVisitor = when {
                 irFunction.isSuspend &&
-                        // We do not generate continuation and state-machine for synthetic accessors, in a sense, they are tail-call
+                        // We do not generate continuation and state-machine for synthetic accessors, bridges, and delegated members,
+                        // in a sense, they are tail-call
                         !irFunction.isKnownToBeTailCall() &&
                         // TODO: We should generate two versions of inline suspend function: one with state-machine and one without
                         !irFunction.isInline ->

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

@@ -13,6 +13,7 @@ import org.jetbrains.kotlin.backend.common.ir.passTypeArgumentsFrom
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
 import org.jetbrains.kotlin.backend.common.phaser.makeIrFilePhase
 import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
+import org.jetbrains.kotlin.backend.jvm.JvmLoweredDeclarationOrigin
 import org.jetbrains.kotlin.backend.jvm.codegen.isJvmInterface
 import org.jetbrains.kotlin.backend.jvm.ir.hasJvmDefault
 import org.jetbrains.kotlin.descriptors.Modality
@@ -108,7 +109,7 @@ private class InterfaceDelegationLowering(val context: JvmBackendContext) : IrEl
             IrFunctionImpl(
                 UNDEFINED_OFFSET,
                 UNDEFINED_OFFSET,
-                IrDeclarationOrigin.DEFINED,
+                JvmLoweredDeclarationOrigin.DEFAULT_IMPLS_BRIDGE,
                 IrSimpleFunctionSymbolImpl(descriptor),
                 classOverride.name,
                 Visibilities.PUBLIC,

compiler/testData/codegen/box/coroutines/delegatedSuspendMember.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST

compiler/testData/codegen/box/coroutines/inlineClasses/bridgeGenerationCrossinline.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST

compiler/testData/codegen/box/coroutines/inlineClasses/bridgeGenerationNonInline.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST

compiler/testData/codegen/box/coroutines/suspendDefaultImpl.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST

compiler/testData/codegen/box/coroutines/suspendFunctionAsCoroutine/superCallInterface.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST