Do not generate $$forInline suffix for enclosing method

in OUTERCLASS field.

The inliner generates two versions of suspend functions/lambdas in
inline functions: with state-machine and without. The former is used
to call the function from Java or via reflection and have ordinary
name, while the latter is used by inliner and have $$forInline suffix.
The inliner throws the state-machine version away, duplicates
$$forInline version and then call state-machine generator.

If these suspend functions/lambdas are not going to be inlined,
$$forInline version is not generated. However, all objects, which are
used in these suspend functions/lambdas, have $$forInline version
written to OUTERCLASS field. This leads to errors by proguard.
Since they are used in both state-machine version and for-inline ones,
we can simply remove $$forInline suffix from OUTERCLASS field and this
fixes the issue.

 #KT-31242 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/AnonymousObjectTransformer.kt

@@ -10,7 +10,9 @@ import org.jetbrains.kotlin.codegen.*
 import org.jetbrains.kotlin.codegen.coroutines.DEBUG_METADATA_ANNOTATION_ASM_TYPE
 import org.jetbrains.kotlin.codegen.coroutines.isCapturedSuspendLambda
 import org.jetbrains.kotlin.codegen.coroutines.isCoroutineSuperClass
+import org.jetbrains.kotlin.codegen.coroutines.isResumeImplMethodName
 import org.jetbrains.kotlin.codegen.inline.coroutines.CoroutineTransformer
+import org.jetbrains.kotlin.codegen.inline.coroutines.FOR_INLINE_SUFFIX
 import org.jetbrains.kotlin.codegen.serialization.JvmCodegenStringTable
 import org.jetbrains.kotlin.load.java.JvmAnnotationNames
 import org.jetbrains.kotlin.load.kotlin.FileBasedKotlinClass
@@ -244,7 +246,14 @@ class AnonymousObjectTransformer(
 
     private fun writeOuterInfo(visitor: ClassVisitor) {
         val info = inliningContext.callSiteInfo
-        visitor.visitOuterClass(info.ownerClassName, info.functionName, info.functionDesc)
+        // Since $$forInline functions are not generated if retransformation is the last one (i.e. call site is not inline)
+        // link to the function in OUTERCLASS field becomes invalid. However, since $$forInline function always has no-inline
+        // companion without the suffix, use it.
+        if (info.isSuspend && info.isInlineOrInsideInline) {
+            visitor.visitOuterClass(info.ownerClassName, info.functionName?.removeSuffix(FOR_INLINE_SUFFIX), info.functionDesc)
+        } else {
+            visitor.visitOuterClass(info.ownerClassName, info.functionName, info.functionDesc)
+        }
     }
 
     private fun inlineMethodAndUpdateGlobalResult(
@@ -288,7 +297,8 @@ class AnonymousObjectTransformer(
                 transformationInfo.oldClassName,
                 sourceNode.name,
                 if (isConstructor) transformationInfo.newConstructorDescriptor else sourceNode.desc,
-                inliningContext.callSiteInfo.isInlineOrInsideInline
+                inliningContext.callSiteInfo.isInlineOrInsideInline,
+                isSuspendFunctionOrLambda(sourceNode)
             ), null
         )
 
@@ -298,6 +308,12 @@ class AnonymousObjectTransformer(
         return result
     }
 
+    private fun isSuspendFunctionOrLambda(sourceNode: MethodNode): Boolean =
+        (sourceNode.desc.endsWith(";Lkotlin/coroutines/Continuation;)Ljava/lang/Object;") ||
+                sourceNode.desc.endsWith(";Lkotlin/coroutines/experimental/Continuation;)Ljava/lang/Object;")) &&
+                (CoroutineTransformer.findFakeContinuationConstructorClassName(sourceNode) != null ||
+                        languageVersionSettings.isResumeImplMethodName(sourceNode.name.removeSuffix(FOR_INLINE_SUFFIX)))
+
     private fun generateConstructorAndFields(
         classBuilder: ClassBuilder,
         allCapturedBuilder: ParametersBuilder,

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCallSiteInfo.kt

@@ -1,19 +1,14 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.codegen.inline
 
-class InlineCallSiteInfo(val ownerClassName: String, val functionName: String?, val functionDesc: String?, val isInlineOrInsideInline: Boolean)
+class InlineCallSiteInfo(
+    val ownerClassName: String,
+    val functionName: String?,
+    val functionDesc: String?,
+    val isInlineOrInsideInline: Boolean,
+    val isSuspend: Boolean
+)

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/SourceCompilerForInline.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -122,7 +122,11 @@ class PsiSourceCompilerForInline(private val codegen: ExpressionCodegen, overrid
 
             val signature = codegen.state.typeMapper.mapSignatureSkipGeneric(context.functionDescriptor, context.contextKind)
             return InlineCallSiteInfo(
-                parentCodegen.className, signature.asmMethod.name, signature.asmMethod.descriptor, compilationContextFunctionDescriptor.isInlineOrInsideInline()
+                parentCodegen.className,
+                signature.asmMethod.name,
+                signature.asmMethod.descriptor,
+                compilationContextFunctionDescriptor.isInlineOrInsideInline(),
+                compilationContextFunctionDescriptor.isSuspend
             )
         }
 

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

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.backend.jvm.codegen
@@ -65,7 +54,7 @@ class IrSourceCompilerForInline(
         get() = OwnerKind.getMemberOwnerKind(callElement.descriptor.containingDeclaration)
 
     override val inlineCallSiteInfo: InlineCallSiteInfo
-        get() = InlineCallSiteInfo("TODO", null, null, false)
+        get() = InlineCallSiteInfo("TODO", null, null, false, false)
 
     override val lazySourceMapper: DefaultSourceMapper
         get() = codegen.classCodegen.getOrCreateSourceMapper()

compiler/testData/codegen/boxInline/suspend/enclodingMethod.kt

@@ -0,0 +1,60 @@
+// IGNORE_BACKEND: JVM_IR
+// TARGET_BACKEND: JVM
+// FILE: flow.kt
+// COMMON_COROUTINES_TEST
+// FULL_JDK
+// WITH_RUNTIME
+// WITH_COROUTINES
+
+package flow
+
+interface FlowCollector<T> {
+    suspend fun emit(value: T)
+}
+
+interface Flow<T> {
+    suspend fun collect(collector: FlowCollector<T>)
+}
+
+public inline fun <T> flow(crossinline block: suspend FlowCollector<T>.() -> Unit) = object : Flow<T> {
+    override suspend fun collect(collector: FlowCollector<T>) = collector.block()
+}
+
+suspend inline fun <T> Flow<T>.collect(crossinline action: suspend (T) -> Unit): Unit =
+    collect(object : FlowCollector<T> {
+        override suspend fun emit(value: T) = action(value)
+    })
+
+public inline fun <T, R> Flow<T>.transform(crossinline transformer: suspend FlowCollector<R>.(value: T) -> Unit): Flow<R> {
+    return flow {
+        collect { value ->
+            transformer(value)
+        }
+    }
+}
+
+public inline fun <T, R> Flow<T>.map(crossinline transformer: suspend (value: T) -> R): Flow<R> = transform { value -> emit(transformer(value)) }
+
+inline fun decorate() = suspend {
+    flow<Int> {
+        emit(1)
+    }.map { it + 1 }
+        .collect {
+        }
+}
+
+// FILE: box.kt
+// COMMON_COROUTINES_TEST
+
+import flow.*
+
+fun box() : String {
+    decorate()
+    val enclosingMethod = try {
+        Class.forName("flow.FlowKt\$decorate\$1\$invokeSuspend\$\$inlined\$map\$1\$1").enclosingMethod
+    } catch (ignore: ClassNotFoundException) {
+        Class.forName("flow.FlowKt\$decorate\$1\$doResume\$\$inlined\$map\$1\$1").enclosingMethod
+    }
+    if ("$enclosingMethod".contains("\$\$forInline")) return "$enclosingMethod"
+    return "OK"
+}

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxInlineCodegenTestGenerated.java

@@ -3430,6 +3430,16 @@ public class BlackBoxInlineCodegenTestGenerated extends AbstractBlackBoxInlineCo
             runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/crossinlineSuspendLambdaInsideCrossinlineSuspendLambda.kt", "kotlin.coroutines");
         }
 
+        @TestMetadata("enclodingMethod.kt")
+        public void testEnclodingMethod_1_2() throws Exception {
+            runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/enclodingMethod.kt", "kotlin.coroutines.experimental");
+        }
+
+        @TestMetadata("enclodingMethod.kt")
+        public void testEnclodingMethod_1_3() throws Exception {
+            runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/enclodingMethod.kt", "kotlin.coroutines");
+        }
+
         @TestMetadata("fileNameInMetadata.kt")
         public void testFileNameInMetadata() throws Exception {
             runTest("compiler/testData/codegen/boxInline/suspend/fileNameInMetadata.kt");

compiler/tests/org/jetbrains/kotlin/codegen/CompileKotlinAgainstInlineKotlinTestGenerated.java

@@ -3430,6 +3430,16 @@ public class CompileKotlinAgainstInlineKotlinTestGenerated extends AbstractCompi
             runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/crossinlineSuspendLambdaInsideCrossinlineSuspendLambda.kt", "kotlin.coroutines");
         }
 
+        @TestMetadata("enclodingMethod.kt")
+        public void testEnclodingMethod_1_2() throws Exception {
+            runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/enclodingMethod.kt", "kotlin.coroutines.experimental");
+        }
+
+        @TestMetadata("enclodingMethod.kt")
+        public void testEnclodingMethod_1_3() throws Exception {
+            runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/enclodingMethod.kt", "kotlin.coroutines");
+        }
+
         @TestMetadata("fileNameInMetadata.kt")
         public void testFileNameInMetadata() throws Exception {
             runTest("compiler/testData/codegen/boxInline/suspend/fileNameInMetadata.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxInlineCodegenTestGenerated.java

@@ -3430,6 +3430,16 @@ public class IrBlackBoxInlineCodegenTestGenerated extends AbstractIrBlackBoxInli
             runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/crossinlineSuspendLambdaInsideCrossinlineSuspendLambda.kt", "kotlin.coroutines");
         }
 
+        @TestMetadata("enclodingMethod.kt")
+        public void testEnclodingMethod_1_2() throws Exception {
+            runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/enclodingMethod.kt", "kotlin.coroutines.experimental");
+        }
+
+        @TestMetadata("enclodingMethod.kt")
+        public void testEnclodingMethod_1_3() throws Exception {
+            runTestWithPackageReplacement("compiler/testData/codegen/boxInline/suspend/enclodingMethod.kt", "kotlin.coroutines");
+        }
+
         @TestMetadata("fileNameInMetadata.kt")
         public void testFileNameInMetadata() throws Exception {
             runTest("compiler/testData/codegen/boxInline/suspend/fileNameInMetadata.kt");