[FE 1.0] Implement deprecation PRIVATE_CLASS_MEMBER_FROM_INLINE_WARNING warning

^KT-55179
^KT-56171 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -18069,6 +18069,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                     runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt14887.kt");
                 }
 
+                @Test
+                @TestMetadata("kt55179.kt")
+                public void testKt55179() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt55179.kt");
+                }
+
                 @Test
                 @TestMetadata("localClass.kt")
                 public void testLocalClass() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java

@@ -18075,6 +18075,12 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                     runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt14887.kt");
                 }
 
+                @Test
+                @TestMetadata("kt55179.kt")
+                public void testKt55179() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt55179.kt");
+                }
+
                 @Test
                 @TestMetadata("localClass.kt")
                 public void testLocalClass() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java

@@ -18069,6 +18069,12 @@ public class FirOldFrontendDiagnosticsWithLightTreeTestGenerated extends Abstrac
                     runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt14887.kt");
                 }
 
+                @Test
+                @TestMetadata("kt55179.kt")
+                public void testKt55179() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt55179.kt");
+                }
+
                 @Test
                 @TestMetadata("localClass.kt")
                 public void testLocalClass() throws Exception {

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -1292,6 +1292,8 @@ public interface Errors {
     DiagnosticFactory0<KtElement> DEPRECATED_IMPLICIT_NON_PUBLIC_API_ACCESS = DiagnosticFactory0.create(WARNING, CALL_ELEMENT);
     DiagnosticFactory2<KtElement, DeclarationDescriptor, DeclarationDescriptor> PRIVATE_CLASS_MEMBER_FROM_INLINE =
             DiagnosticFactory2.create(ERROR, CALL_ELEMENT);
+    DiagnosticFactory2<KtElement, DeclarationDescriptor, DeclarationDescriptor> PRIVATE_CLASS_MEMBER_FROM_INLINE_WARNING =
+            DiagnosticFactory2.create(WARNING, CALL_ELEMENT);
     DiagnosticFactory1<KtElement, KtElement> NON_LOCAL_RETURN_NOT_ALLOWED = DiagnosticFactory1.create(ERROR, CALL_ELEMENT);
     DiagnosticFactory1<KtDeclaration, String> NOT_YET_SUPPORTED_IN_INLINE =
             DiagnosticFactory1.create(ERROR, NOT_SUPPORTED_IN_INLINE_MOST_RELEVANT);

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -1121,6 +1121,7 @@ public class DefaultErrorMessages {
         MAP.put(NON_PUBLIC_CALL_FROM_PUBLIC_INLINE, "Public-API inline function cannot access non-public-API ''{0}''", SHORT_NAMES_IN_TYPES, SHORT_NAMES_IN_TYPES);
         MAP.put(DEPRECATED_IMPLICIT_NON_PUBLIC_API_ACCESS, "Deprecated implicit access of non-public-API from public-API inline function");
         MAP.put(PRIVATE_CLASS_MEMBER_FROM_INLINE, "Non-private inline function cannot access members of private classes: ''{0}''", SHORT_NAMES_IN_TYPES, SHORT_NAMES_IN_TYPES);
+        MAP.put(PRIVATE_CLASS_MEMBER_FROM_INLINE_WARNING, "Non-private inline function cannot access members of private classes: ''{0}''. This warning will become an error in 2.0", SHORT_NAMES_IN_TYPES, SHORT_NAMES_IN_TYPES);
         MAP.put(NOT_YET_SUPPORTED_IN_INLINE, "{0} are not yet supported in inline functions", STRING);
         MAP.put(DECLARATION_CANT_BE_INLINED, "'inline' modifier is not allowed on virtual members. Only private or final members can be inlined");
         MAP.put(DECLARATION_CANT_BE_INLINED_WARNING, "'inline' modifier is not allowed on virtual enum members. Only private or final members can be inlined. This warning will become an error in K2");

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/checkers/InlineChecker.kt

@@ -34,6 +34,7 @@ import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
 import org.jetbrains.kotlin.resolve.calls.model.VariableAsFunctionResolvedCall
 import org.jetbrains.kotlin.resolve.descriptorUtil.isEffectivelyPrivateApi
 import org.jetbrains.kotlin.resolve.descriptorUtil.isInsidePrivateClass
+import org.jetbrains.kotlin.resolve.descriptorUtil.isMemberOfCompanionOfPrivateClass
 import org.jetbrains.kotlin.resolve.inline.InlineUtil
 import org.jetbrains.kotlin.resolve.inline.InlineUtil.allowsNonLocalReturns
 import org.jetbrains.kotlin.resolve.inline.InlineUtil.checkNonLocalReturnUsage
@@ -314,6 +315,9 @@ internal class InlineChecker(private val descriptor: FunctionDescriptor) : CallC
             if (declarationDescriptor.isInsidePrivateClass) {
                 context.trace.report(PRIVATE_CLASS_MEMBER_FROM_INLINE.on(expression, declarationDescriptor, descriptor))
                 context.reportDeprecationOnReplacement(expression, replacementForReport)
+            } else if (declarationDescriptor.isMemberOfCompanionOfPrivateClass) {
+                context.trace.report(PRIVATE_CLASS_MEMBER_FROM_INLINE_WARNING.on(expression, declarationDescriptor, descriptor))
+                context.reportDeprecationOnReplacement(expression, replacementForReport)
             }
         }
     }

compiler/testData/diagnostics/tests/inline/nonPublicMember/kt55179.fir.kt

@@ -0,0 +1,15 @@
+// ISSUE: KT-55179
+// SKIP_TXT
+
+private class Foo {
+    companion object {
+        fun buildFoo() = Foo()
+    }
+}
+
+internal <!NOTHING_TO_INLINE!>inline<!> fun foo() {
+    <!PRIVATE_CLASS_MEMBER_FROM_INLINE!>Foo<!>()
+    Foo.Companion
+    Foo.buildFoo()
+}
+

compiler/testData/diagnostics/tests/inline/nonPublicMember/kt55179.kt

@@ -0,0 +1,15 @@
+// ISSUE: KT-55179
+// SKIP_TXT
+
+private class Foo {
+    companion object {
+        fun buildFoo() = Foo()
+    }
+}
+
+internal <!NOTHING_TO_INLINE!>inline<!> fun foo() {
+    <!PRIVATE_CLASS_MEMBER_FROM_INLINE!>Foo<!>()
+    Foo.<!PRIVATE_CLASS_MEMBER_FROM_INLINE!>Companion<!>
+    Foo.<!PRIVATE_CLASS_MEMBER_FROM_INLINE_WARNING!>buildFoo<!>()
+}
+

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java

@@ -18075,6 +18075,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                     runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt14887.kt");
                 }
 
+                @Test
+                @TestMetadata("kt55179.kt")
+                public void testKt55179() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/inline/nonPublicMember/kt55179.kt");
+                }
+
                 @Test
                 @TestMetadata("localClass.kt")
                 public void testLocalClass() throws Exception {

core/descriptors/src/org/jetbrains/kotlin/resolve/DescriptorUtils.kt

@@ -135,6 +135,13 @@ val DeclarationDescriptor.isInsidePrivateClass: Boolean
         return parent != null && DescriptorVisibilities.isPrivate(parent.visibility)
     }
 
+val DeclarationDescriptor.isMemberOfCompanionOfPrivateClass: Boolean
+    get() {
+        val parent = containingDeclaration as? ClassDescriptor ?: return false
+        if (!parent.isCompanionObject) return false
+        return parent.isInsidePrivateClass
+    }
+
 val DeclarationDescriptor.isInsideInterface: Boolean
     get() {
         val parent = containingDeclaration as? ClassDescriptor