IC Mangling: search parents for method if descriptor is fake override

Otherwise, the compiler generates call using old mangling scheme
because classfile does not contain the method.

compiler/backend/src/org/jetbrains/kotlin/codegen/inlineClassesCodegenUtil.kt

@@ -6,10 +6,7 @@
 package org.jetbrains.kotlin.codegen
 
 import org.jetbrains.kotlin.codegen.state.GenerationState
-import org.jetbrains.kotlin.descriptors.CallableDescriptor
+import org.jetbrains.kotlin.descriptors.*
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.FunctionDescriptor
-import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
 import org.jetbrains.kotlin.descriptors.impl.AnonymousFunctionDescriptor
 import org.jetbrains.kotlin.load.kotlin.JvmPackagePartSource
 import org.jetbrains.kotlin.load.kotlin.VirtualFileFinder
@@ -44,6 +41,10 @@ fun CallableDescriptor.isGenericParameter(): Boolean {
 fun classFileContainsMethod(descriptor: FunctionDescriptor, state: GenerationState, method: Method): Boolean? {
     if (descriptor !is DeserializedSimpleFunctionDescriptor) return null
 
+    if (descriptor.kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE) {
+        return descriptor.overriddenDescriptors.any { classFileContainsMethod(it, state, method) == true }
+    }
+
     val classId: ClassId = when {
         descriptor.containingDeclaration is DeserializedClassDescriptor -> {
             (descriptor.containingDeclaration as DeserializedClassDescriptor).classId ?: return null

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/codegen/FirCompileKotlinAgainstKotlinTestGenerated.java

@@ -153,6 +153,11 @@ public class FirCompileKotlinAgainstKotlinTestGenerated extends AbstractFirCompi
         runTest("compiler/testData/compileKotlinAgainstKotlin/importCompanion.kt");
     }
 
+    @TestMetadata("inlineClassFakeOverrideMangling.kt")
+    public void testInlineClassFakeOverrideMangling() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFakeOverrideMangling.kt");
+    }
+
     @TestMetadata("inlineClassFromBinaryDependencies.kt")
     public void testInlineClassFromBinaryDependencies() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFromBinaryDependencies.kt");

compiler/testData/compileKotlinAgainstKotlin/inlineClassFakeOverrideMangling.kt

@@ -0,0 +1,22 @@
+// !LANGUAGE: +InlineClasses
+
+// FILE: 1.kt
+
+inline class IC(val s: String)
+
+abstract class A {
+    fun foo(s: String) = IC(s)
+}
+
+open class C : A()
+
+class D: C()
+
+// FILE: 2.kt
+
+fun box(): String {
+    var res = C().foo("OK").s
+    if (res != "OK") return "FAIL 1 $res"
+    res = D().foo("OK").s
+    return res
+}

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

@@ -158,6 +158,11 @@ public class CompileKotlinAgainstKotlinTestGenerated extends AbstractCompileKotl
         runTest("compiler/testData/compileKotlinAgainstKotlin/importCompanion.kt");
     }
 
+    @TestMetadata("inlineClassFakeOverrideMangling.kt")
+    public void testInlineClassFakeOverrideMangling() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFakeOverrideMangling.kt");
+    }
+
     @TestMetadata("inlineClassFromBinaryDependencies.kt")
     public void testInlineClassFromBinaryDependencies() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFromBinaryDependencies.kt");

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

@@ -153,6 +153,11 @@ public class IrCompileKotlinAgainstKotlinTestGenerated extends AbstractIrCompile
         runTest("compiler/testData/compileKotlinAgainstKotlin/importCompanion.kt");
     }
 
+    @TestMetadata("inlineClassFakeOverrideMangling.kt")
+    public void testInlineClassFakeOverrideMangling() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFakeOverrideMangling.kt");
+    }
+
     @TestMetadata("inlineClassFromBinaryDependencies.kt")
     public void testInlineClassFromBinaryDependencies() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFromBinaryDependencies.kt");

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

@@ -153,6 +153,11 @@ public class JvmIrAgainstOldBoxTestGenerated extends AbstractJvmIrAgainstOldBoxT
         runTest("compiler/testData/compileKotlinAgainstKotlin/importCompanion.kt");
     }
 
+    @TestMetadata("inlineClassFakeOverrideMangling.kt")
+    public void testInlineClassFakeOverrideMangling() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFakeOverrideMangling.kt");
+    }
+
     @TestMetadata("inlineClassFromBinaryDependencies.kt")
     public void testInlineClassFromBinaryDependencies() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFromBinaryDependencies.kt");

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

@@ -153,6 +153,11 @@ public class JvmOldAgainstIrBoxTestGenerated extends AbstractJvmOldAgainstIrBoxT
         runTest("compiler/testData/compileKotlinAgainstKotlin/importCompanion.kt");
     }
 
+    @TestMetadata("inlineClassFakeOverrideMangling.kt")
+    public void testInlineClassFakeOverrideMangling() throws Exception {
+        runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFakeOverrideMangling.kt");
+    }
+
     @TestMetadata("inlineClassFromBinaryDependencies.kt")
     public void testInlineClassFromBinaryDependencies() throws Exception {
         runTest("compiler/testData/compileKotlinAgainstKotlin/inlineClassFromBinaryDependencies.kt");