K2: introduce OptIn language version checker

#KT-60598 Fixed

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/config/FirOptInLanguageVersionSettingsChecker.kt

@@ -5,9 +5,45 @@
 
 package org.jetbrains.kotlin.fir.analysis.checkers.config
 
+import org.jetbrains.kotlin.config.AnalysisFlags
 import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
+import org.jetbrains.kotlin.fir.declarations.getAnnotationByClassId
+import org.jetbrains.kotlin.fir.resolve.providers.symbolProvider
+import org.jetbrains.kotlin.fir.resolve.transformers.PackageResolutionResult
+import org.jetbrains.kotlin.fir.resolve.transformers.resolveToPackageOrClass
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.resolve.checkers.OptInNames
+import org.jetbrains.kotlin.resolve.deprecation.DeprecationLevelValue
 
 object FirOptInLanguageVersionSettingsChecker : FirLanguageVersionSettingsChecker() {
     override fun check(context: CheckerContext, rawReport: (Boolean, String) -> Unit) {
+        context.languageVersionSettings.getFlag(AnalysisFlags.optIn).forEach { fqNameAsString ->
+            if (fqNameAsString != OptInNames.REQUIRES_OPT_IN_FQ_NAME.asString()) {
+                checkOptInMarkerArgument(context, fqNameAsString, rawReport)
+            }
+        }
     }
-}
+
+    private fun checkOptInMarkerArgument(context: CheckerContext, fqNameAsString: String, rawReport: (Boolean, String) -> Unit) {
+        val packageOrClass = resolveToPackageOrClass(context.session.symbolProvider, FqName(fqNameAsString))
+        val symbol = (packageOrClass as? PackageResolutionResult.PackageOrClass)?.classSymbol
+
+        if (symbol == null) {
+            rawReport(
+                false,
+                "Opt-in requirement marker $fqNameAsString is unresolved. Please make sure it's present in the module dependencies"
+            )
+            return
+        }
+
+        if (symbol.getAnnotationByClassId(OptInNames.REQUIRES_OPT_IN_CLASS_ID, context.session) == null) {
+            rawReport(false, "Class $fqNameAsString is not an opt-in requirement marker")
+            return
+        }
+        val deprecationInfo = symbol.getDeprecation(context.languageVersionSettings.apiVersion)?.all ?: return
+        rawReport(
+            deprecationInfo.deprecationLevel != DeprecationLevelValue.WARNING,
+            "Opt-in requirement marker $fqNameAsString is deprecated" + deprecationInfo.message?.let { ". $it" }.orEmpty()
+        )
+    }
+}

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/collectors/components/LanguageVersionSettingsDiagnosticComponent.kt

@@ -10,7 +10,6 @@ import org.jetbrains.kotlin.diagnostics.impl.BaseDiagnosticsCollector
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.analysis.CheckersComponentInternal
 import org.jetbrains.kotlin.fir.analysis.checkers.LanguageVersionSettingsCheckers
-import org.jetbrains.kotlin.fir.analysis.checkers.config.FirLanguageVersionSettingsChecker
 import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
 import org.jetbrains.kotlin.fir.analysis.checkersComponent
 
@@ -21,13 +20,9 @@ class LanguageVersionSettingsDiagnosticComponent(
     private val checkers: LanguageVersionSettingsCheckers = session.checkersComponent.languageVersionSettingsCheckers,
 ) : AbstractDiagnosticCollectorComponent(session, reporter) {
     override fun checkSettings(data: CheckerContext) {
-        checkers.languageVersionSettingsCheckers.check(data)
-    }
-
-    private fun Collection<FirLanguageVersionSettingsChecker>.check(context: CheckerContext) {
         val rawReport = (reporter as? BaseDiagnosticsCollector)?.rawReport ?: return
-        for (checker in this) {
+        for (checker in checkers.languageVersionSettingsCheckers) {
-            checker.check(context, rawReport)
+            checker.check(data, rawReport)
         }
     }
 }

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirImportResolveTransformer.kt

@@ -13,16 +13,12 @@ import org.jetbrains.kotlin.fir.declarations.FirRegularClass
 import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
 import org.jetbrains.kotlin.fir.declarations.builder.buildErrorImport
 import org.jetbrains.kotlin.fir.declarations.builder.buildResolvedImport
-import org.jetbrains.kotlin.fir.diagnostics.ConeDiagnostic
 import org.jetbrains.kotlin.fir.lookupTracker
 import org.jetbrains.kotlin.fir.resolve.ScopeSession
 import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeImportFromSingleton
-import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeUnresolvedParentInImport
 import org.jetbrains.kotlin.fir.resolve.providers.FirSymbolProvider
 import org.jetbrains.kotlin.fir.resolve.providers.symbolProvider
-import org.jetbrains.kotlin.fir.symbols.impl.FirClassLikeSymbol
 import org.jetbrains.kotlin.fir.withFileAnalysisExceptionWrapping
-import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
 
 class FirImportResolveProcessor(session: FirSession, scopeSession: ScopeSession) : FirTransformerBasedResolveProcessor(
@@ -100,35 +96,3 @@ open class FirImportResolveTransformer protected constructor(
         }
     }
 }
-
-fun resolveToPackageOrClass(symbolProvider: FirSymbolProvider, fqName: FqName): PackageResolutionResult {
-    var currentPackage = fqName
-
-    val pathSegments = fqName.pathSegments()
-    var prefixSize = pathSegments.size
-    while (!currentPackage.isRoot && prefixSize > 0) {
-        if (symbolProvider.getPackage(currentPackage) != null) {
-            break
-        }
-        currentPackage = currentPackage.parent()
-        prefixSize--
-    }
-
-    if (currentPackage == fqName) return PackageResolutionResult.PackageOrClass(currentPackage, null, null)
-    val relativeClassFqName = FqName.fromSegments((prefixSize until pathSegments.size).map { pathSegments[it].asString() })
-
-    val classId = ClassId(currentPackage, relativeClassFqName, false)
-    val symbol = symbolProvider.getClassLikeSymbolByClassId(classId) ?: return PackageResolutionResult.Error(
-        ConeUnresolvedParentInImport(classId)
-    )
-
-    return PackageResolutionResult.PackageOrClass(currentPackage, relativeClassFqName, symbol)
-}
-
-sealed class PackageResolutionResult {
-    data class PackageOrClass(
-        val packageFqName: FqName, val relativeClassFqName: FqName?, val classSymbol: FirClassLikeSymbol<*>?
-    ) : PackageResolutionResult()
-
-    class Error(val diagnostic: ConeDiagnostic) : PackageResolutionResult()
-}

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/transformers/ImportUtils.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2023 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.fir.resolve.transformers
+
+import org.jetbrains.kotlin.fir.diagnostics.ConeDiagnostic
+import org.jetbrains.kotlin.fir.resolve.diagnostics.ConeUnresolvedParentInImport
+import org.jetbrains.kotlin.fir.resolve.providers.FirSymbolProvider
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassLikeSymbol
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+
+fun resolveToPackageOrClass(symbolProvider: FirSymbolProvider, fqName: FqName): PackageResolutionResult {
+    var currentPackage = fqName
+
+    val pathSegments = fqName.pathSegments()
+    var prefixSize = pathSegments.size
+    while (!currentPackage.isRoot && prefixSize > 0) {
+        if (symbolProvider.getPackage(currentPackage) != null) {
+            break
+        }
+        currentPackage = currentPackage.parent()
+        prefixSize--
+    }
+
+    if (currentPackage == fqName) return PackageResolutionResult.PackageOrClass(currentPackage, null, null)
+    val relativeClassFqName = FqName.fromSegments((prefixSize until pathSegments.size).map { pathSegments[it].asString() })
+
+    val classId = ClassId(currentPackage, relativeClassFqName, false)
+    val symbol = symbolProvider.getClassLikeSymbolByClassId(classId) ?: return PackageResolutionResult.Error(
+        ConeUnresolvedParentInImport(classId)
+    )
+
+    return PackageResolutionResult.PackageOrClass(currentPackage, relativeClassFqName, symbol)
+}
+
+sealed class PackageResolutionResult {
+    data class PackageOrClass(
+        val packageFqName: FqName, val relativeClassFqName: FqName?, val classSymbol: FirClassLikeSymbol<*>?
+    ) : PackageResolutionResult()
+
+    class Error(val diagnostic: ConeDiagnostic) : PackageResolutionResult()
+}

compiler/testData/cli/jvm/experimentalDeprecated.args

@@ -1,6 +1,8 @@
 $TESTDATA_DIR$/experimentalDeprecated.kt
 -d
 $TEMP_DIR$
+-language-version
+2.0
 -opt-in=kotlin.RequiresOptIn
 -opt-in=org.test.Error
 -opt-in=org.test.Hidden

compiler/testData/cli/jvm/experimentalDeprecated.out

@@ -1,3 +1,4 @@
-error: opt-in requirement marker org.test.Error is deprecated. Error
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
-error: opt-in requirement marker org.test.Hidden is deprecated. Hidden
+error: opt-in requirement marker org.test.Error is deprecated
+error: opt-in requirement marker org.test.Hidden is deprecated
 COMPILATION_ERROR

compiler/testData/cli/jvm/experimentalDeprecatedK1.args

@@ -0,0 +1,8 @@
+$TESTDATA_DIR$/experimentalDeprecated.kt
+-d
+$TEMP_DIR$
+-language-version
+1.9
+-opt-in=kotlin.RequiresOptIn
+-opt-in=org.test.Error
+-opt-in=org.test.Hidden

compiler/testData/cli/jvm/experimentalDeprecatedK1.out

@@ -0,0 +1,3 @@
+error: opt-in requirement marker org.test.Error is deprecated. Error
+error: opt-in requirement marker org.test.Hidden is deprecated. Hidden
+COMPILATION_ERROR

compiler/testData/cli/jvm/experimentalDeprecatedWarning.args

@@ -1,7 +1,8 @@
 $TESTDATA_DIR$/experimentalDeprecatedWarning.kt
 -d
 $TEMP_DIR$
+-language-version
+2.0
 -Xopt-in=kotlin.RequiresOptIn
 -opt-in=kotlin.RequiresOptIn
 -opt-in=org.test.Warning
-

compiler/testData/cli/jvm/experimentalDeprecatedWarning.out

@@ -1,3 +1,4 @@
 warning: argument -Xopt-in is deprecated. Please use -opt-in instead
-warning: opt-in requirement marker org.test.Warning is deprecated. Warning
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
+warning: opt-in requirement marker org.test.Warning is deprecated
 OK

compiler/testData/cli/jvm/experimentalDeprecatedWarningK1.args

@@ -0,0 +1,8 @@
+$TESTDATA_DIR$/experimentalDeprecatedWarning.kt
+-d
+$TEMP_DIR$
+-language-version
+1.9
+-Xopt-in=kotlin.RequiresOptIn
+-opt-in=kotlin.RequiresOptIn
+-opt-in=org.test.Warning

compiler/testData/cli/jvm/experimentalDeprecatedWarningK1.out

@@ -0,0 +1,3 @@
+warning: argument -Xopt-in is deprecated. Please use -opt-in instead
+warning: opt-in requirement marker org.test.Warning is deprecated. Warning
+OK

compiler/testData/cli/jvm/experimentalIsNotAnnotation.args

@@ -1,6 +1,8 @@
 $TESTDATA_DIR$/experimentalIsNotAnnotation.kt
 -d
 $TEMP_DIR$
+-language-version
+2.0
 -opt-in
 org.test.NotAnAnnotation1
 -opt-in=org.test.NotAnAnnotation2

compiler/testData/cli/jvm/experimentalIsNotAnnotation.out

@@ -1,3 +1,4 @@
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
 warning: class org.test.NotAnAnnotation1 is not an opt-in requirement marker
 warning: class org.test.NotAnAnnotation2 is not an opt-in requirement marker
 OK

compiler/testData/cli/jvm/experimentalIsNotAnnotationK1.args

@@ -0,0 +1,8 @@
+$TESTDATA_DIR$/experimentalIsNotAnnotation.kt
+-d
+$TEMP_DIR$
+-language-version
+1.9
+-opt-in
+org.test.NotAnAnnotation1
+-opt-in=org.test.NotAnAnnotation2

compiler/testData/cli/jvm/experimentalIsNotAnnotationK1.out

@@ -0,0 +1,3 @@
+warning: class org.test.NotAnAnnotation1 is not an opt-in requirement marker
+warning: class org.test.NotAnAnnotation2 is not an opt-in requirement marker
+OK

compiler/testData/cli/jvm/experimentalIsNotMarker.args

@@ -1,4 +1,6 @@
 $TESTDATA_DIR$/experimentalIsNotMarker.kt
 -d
 $TEMP_DIR$
+-language-version
+2.0
 -opt-in=org.test.NotAMarker

compiler/testData/cli/jvm/experimentalIsNotMarker.out

@@ -1,2 +1,3 @@
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
 warning: class org.test.NotAMarker is not an opt-in requirement marker
 OK

compiler/testData/cli/jvm/experimentalIsNotMarkerK1.args

@@ -0,0 +1,6 @@
+$TESTDATA_DIR$/experimentalIsNotMarker.kt
+-d
+$TEMP_DIR$
+-language-version
+1.9
+-opt-in=org.test.NotAMarker

compiler/testData/cli/jvm/experimentalIsNotMarkerK1.out

@@ -0,0 +1,2 @@
+warning: class org.test.NotAMarker is not an opt-in requirement marker
+OK

compiler/testData/cli/jvm/experimentalNested.args

@@ -1,5 +1,7 @@
 $TESTDATA_DIR$/experimentalNested.kt
 -d
 $TEMP_DIR$
+-language-version
+2.0
 -opt-in=kotlin.RequiresOptIn
 -opt-in=org.test.Outer.Nested

compiler/testData/cli/jvm/experimentalNested.out

@@ -1 +1,2 @@
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
 OK

compiler/testData/cli/jvm/experimentalNestedK1.args

@@ -0,0 +1,7 @@
+$TESTDATA_DIR$/experimentalNested.kt
+-d
+$TEMP_DIR$
+-language-version
+1.9
+-opt-in=kotlin.RequiresOptIn
+-opt-in=org.test.Outer.Nested

compiler/testData/cli/jvm/experimentalNestedK1.out

@@ -0,0 +1 @@
+OK

compiler/testData/cli/jvm/experimentalUnresolved.args

@@ -1,8 +1,9 @@
 $TESTDATA_DIR$/experimentalUnresolved.kt
 -d
 $TEMP_DIR$
+-language-version
+2.0
 -opt-in
 org.test.Unresolved1
 -opt-in
 org.test.Unresolved2
-

compiler/testData/cli/jvm/experimentalUnresolved.out

@@ -1,3 +1,4 @@
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
 warning: opt-in requirement marker org.test.Unresolved1 is unresolved. Please make sure it's present in the module dependencies
 warning: opt-in requirement marker org.test.Unresolved2 is unresolved. Please make sure it's present in the module dependencies
 OK

compiler/testData/cli/jvm/experimentalUnresolvedK1.args

@@ -0,0 +1,9 @@
+$TESTDATA_DIR$/experimentalUnresolved.kt
+-d
+$TEMP_DIR$
+-language-version
+1.9
+-opt-in
+org.test.Unresolved1
+-opt-in
+org.test.Unresolved2

compiler/testData/cli/jvm/experimentalUnresolvedK1.out

@@ -0,0 +1,3 @@
+warning: opt-in requirement marker org.test.Unresolved1 is unresolved. Please make sure it's present in the module dependencies
+warning: opt-in requirement marker org.test.Unresolved2 is unresolved. Please make sure it's present in the module dependencies
+OK

compiler/tests-gen/org/jetbrains/kotlin/cli/CliTestGenerated.java

@@ -410,31 +410,61 @@ public class CliTestGenerated extends AbstractCliTest {
             runTest("compiler/testData/cli/jvm/experimentalDeprecated.args");
         }
 
+        @TestMetadata("experimentalDeprecatedK1.args")
+        public void testExperimentalDeprecatedK1() throws Exception {
+            runTest("compiler/testData/cli/jvm/experimentalDeprecatedK1.args");
+        }
+
         @TestMetadata("experimentalDeprecatedWarning.args")
         public void testExperimentalDeprecatedWarning() throws Exception {
             runTest("compiler/testData/cli/jvm/experimentalDeprecatedWarning.args");
         }
 
+        @TestMetadata("experimentalDeprecatedWarningK1.args")
+        public void testExperimentalDeprecatedWarningK1() throws Exception {
+            runTest("compiler/testData/cli/jvm/experimentalDeprecatedWarningK1.args");
+        }
+
         @TestMetadata("experimentalIsNotAnnotation.args")
         public void testExperimentalIsNotAnnotation() throws Exception {
             runTest("compiler/testData/cli/jvm/experimentalIsNotAnnotation.args");
         }
 
+        @TestMetadata("experimentalIsNotAnnotationK1.args")
+        public void testExperimentalIsNotAnnotationK1() throws Exception {
+            runTest("compiler/testData/cli/jvm/experimentalIsNotAnnotationK1.args");
+        }
+
         @TestMetadata("experimentalIsNotMarker.args")
         public void testExperimentalIsNotMarker() throws Exception {
             runTest("compiler/testData/cli/jvm/experimentalIsNotMarker.args");
         }
 
+        @TestMetadata("experimentalIsNotMarkerK1.args")
+        public void testExperimentalIsNotMarkerK1() throws Exception {
+            runTest("compiler/testData/cli/jvm/experimentalIsNotMarkerK1.args");
+        }
+
         @TestMetadata("experimentalNested.args")
         public void testExperimentalNested() throws Exception {
             runTest("compiler/testData/cli/jvm/experimentalNested.args");
         }
 
+        @TestMetadata("experimentalNestedK1.args")
+        public void testExperimentalNestedK1() throws Exception {
+            runTest("compiler/testData/cli/jvm/experimentalNestedK1.args");
+        }
+
         @TestMetadata("experimentalUnresolved.args")
         public void testExperimentalUnresolved() throws Exception {
             runTest("compiler/testData/cli/jvm/experimentalUnresolved.args");
         }
 
+        @TestMetadata("experimentalUnresolvedK1.args")
+        public void testExperimentalUnresolvedK1() throws Exception {
+            runTest("compiler/testData/cli/jvm/experimentalUnresolvedK1.args");
+        }
+
         @TestMetadata("explicitlyDisableSamConversionsWithOldFlag.args")
         public void testExplicitlyDisableSamConversionsWithOldFlag() throws Exception {
             runTest("compiler/testData/cli/jvm/explicitlyDisableSamConversionsWithOldFlag.args");