LV 2.0: drop reporting FIR_COMPILED_CLASS and relevant stuff

#KT-62056 Fixed
Related to KT-59171, KT-61951

compiler/cli/src/org/jetbrains/kotlin/cli/common/fir/FirDiagnosticsCompilerResultsReporter.kt

@@ -29,8 +29,7 @@ object FirDiagnosticsCompilerResultsReporter {
             AnalyzerWithCompilerReport.reportSpecialErrors(
                 diagnosticsCollector.diagnostics.any { it.factory == FirErrors.INCOMPATIBLE_CLASS },
                 diagnosticsCollector.diagnostics.any { it.factory == FirErrors.PRE_RELEASE_CLASS },
-                hasUnstableClasses = false,     // TODO (KT-61598): report FIR_COMPILED_CLASS and IR_WITH_UNSTABLE_ABI_COMPILED_CLASS
-                hasFirUnstableClasses = false,  // TODO (KT-61598): report FIR_COMPILED_CLASS and IR_WITH_UNSTABLE_ABI_COMPILED_CLASS
+                hasUnstableClasses = false,     // TODO (KT-61598): report IR_WITH_UNSTABLE_ABI_COMPILED_CLASS
                 messageCollector,
             )
         }

compiler/cli/src/org/jetbrains/kotlin/cli/common/messages/AnalyzerWithCompilerReport.kt

@@ -185,7 +185,6 @@ class AnalyzerWithCompilerReport(
                     diagnostics.any { it.factory == Errors.INCOMPATIBLE_CLASS },
                     diagnostics.any { it.factory == Errors.PRE_RELEASE_CLASS },
                     diagnostics.any { it.factory == Errors.IR_WITH_UNSTABLE_ABI_COMPILED_CLASS },
-                    diagnostics.any { it.factory == Errors.FIR_COMPILED_CLASS },
                     messageCollector,
                 )
             }
@@ -195,7 +194,6 @@ class AnalyzerWithCompilerReport(
             hasIncompatibleClasses: Boolean,
             hasPrereleaseClasses: Boolean,
             hasUnstableClasses: Boolean,
-            hasFirUnstableClasses: Boolean,
             messageCollector: MessageCollector,
         ) {
             if (hasIncompatibleClasses) {
@@ -222,14 +220,6 @@ class AnalyzerWithCompilerReport(
                             "Remove them from the classpath or use '-Xallow-unstable-dependencies' to suppress errors"
                 )
             }
-
-            if (hasFirUnstableClasses) {
-                messageCollector.report(
-                    ERROR,
-                    "Classes compiled by the new Kotlin compiler frontend were found in dependencies. " +
-                            "Remove them from the classpath or use '-Xallow-unstable-dependencies' to suppress errors"
-                )
-            }
         }
 
         fun reportSyntaxErrors(file: PsiElement, reporter: DiagnosticMessageReporter): SyntaxErrorReport {

compiler/fir/fir2ir/jvm-backend/src/org/jetbrains/kotlin/fir/backend/jvm/FirJvmBackendExtension.kt

@@ -44,7 +44,6 @@ class FirJvmBackendExtension(
     companion object {
         fun generateMetadataExtraFlags(abiStability: JvmAbiStability?): Int =
             JvmAnnotationNames.METADATA_JVM_IR_FLAG or
-                    JvmAnnotationNames.METADATA_FIR_FLAG or
-                    (if (abiStability == JvmAbiStability.STABLE) JvmAnnotationNames.METADATA_JVM_IR_STABLE_ABI_FLAG else 0)
+                    (if (abiStability != JvmAbiStability.UNSTABLE) JvmAnnotationNames.METADATA_JVM_IR_STABLE_ABI_FLAG else 0)
     }
 }

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/deserialization/JvmClassFileBasedSymbolProvider.kt

@@ -136,7 +136,6 @@ class JvmClassFileBasedSymbolProvider(
     private val KotlinJvmBinaryClass.abiStability: DeserializedContainerAbiStability
         get() = when {
             session.languageVersionSettings.getFlag(AnalysisFlags.allowUnstableDependencies) -> DeserializedContainerAbiStability.STABLE
-            classHeader.isUnstableFirBinary -> DeserializedContainerAbiStability.FIR_UNSTABLE
             classHeader.isUnstableJvmIrBinary -> DeserializedContainerAbiStability.IR_UNSTABLE
             else -> DeserializedContainerAbiStability.STABLE
         }

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/MissingDependencyClassChecker.kt

@@ -59,9 +59,6 @@ object MissingDependencyClassChecker : CallChecker {
             if (source.isPreReleaseInvisible) {
                 return PRE_RELEASE_CLASS.on(reportOn, source.presentableString)
             }
-            if (source.abiStability == DeserializedContainerAbiStability.FIR_UNSTABLE) {
-                return FIR_COMPILED_CLASS.on(reportOn, source.presentableString)
-            }
             if (source.abiStability == DeserializedContainerAbiStability.IR_UNSTABLE) {
                 return IR_WITH_UNSTABLE_ABI_COMPILED_CLASS.on(reportOn, source.presentableString)
             }

compiler/testData/compileKotlinAgainstCustomBinaries/againstFir/output.fir.txt

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

compiler/testData/compileKotlinAgainstCustomBinaries/againstFir/output.txt

@@ -1,8 +1 @@
-error: classes compiled by the new Kotlin compiler frontend were found in dependencies. Remove them from the classpath or use '-Xallow-unstable-dependencies' to suppress errors
-compiler/testData/compileKotlinAgainstCustomBinaries/againstFir/source.kt:4:5: error: class 'lib.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    get { Box("OK").value }
-    ^
-compiler/testData/compileKotlinAgainstCustomBinaries/againstFir/source.kt:4:11: error: class 'lib.Box' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    get { Box("OK").value }
-          ^
-COMPILATION_ERROR
+OK

compiler/testData/compileKotlinAgainstCustomBinaries/againstFirWithUnstableAbi/output.txt

@@ -1,8 +1,8 @@
-error: classes compiled by the new Kotlin compiler frontend were found in dependencies. Remove them from the classpath or use '-Xallow-unstable-dependencies' to suppress errors
-compiler/testData/compileKotlinAgainstCustomBinaries/againstFirWithUnstableAbi/source.kt:4:5: error: class 'lib.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
+error: classes compiled by an unstable version of the Kotlin compiler were found in dependencies. Remove them from the classpath or use '-Xallow-unstable-dependencies' to suppress errors
+compiler/testData/compileKotlinAgainstCustomBinaries/againstFirWithUnstableAbi/source.kt:4:5: error: class 'lib.AKt' is compiled by an unstable version of the Kotlin compiler and cannot be loaded by this compiler
     get { Box("OK").value }
     ^
-compiler/testData/compileKotlinAgainstCustomBinaries/againstFirWithUnstableAbi/source.kt:4:11: error: class 'lib.Box' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
+compiler/testData/compileKotlinAgainstCustomBinaries/againstFirWithUnstableAbi/source.kt:4:11: error: class 'lib.Box' is compiled by an unstable version of the Kotlin compiler and cannot be loaded by this compiler
     get { Box("OK").value }
           ^
 COMPILATION_ERROR

compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/output.fir.txt

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

compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/output.txt

@@ -1,26 +1 @@
-error: classes compiled by the new Kotlin compiler frontend were found in dependencies. Remove them from the classpath or use '-Xallow-unstable-dependencies' to suppress errors
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:6:16: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-fun baz(param: A) {
-               ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:7:23: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val constructor = A()
-                      ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:8:22: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val methodCall = param.hashCode()
-                     ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:9:30: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val supertype = object : A() {}
-                             ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:11:13: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val x = foo()
-            ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:12:13: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val y = bar
-            ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:13:5: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    bar = 239
-    ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck/source.kt:14:12: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val z: TA = ""
-           ^
-COMPILATION_ERROR
+OK

compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/output.fir.txt

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

compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/output.txt

@@ -1,26 +1 @@
-error: classes compiled by the new Kotlin compiler frontend were found in dependencies. Remove them from the classpath or use '-Xallow-unstable-dependencies' to suppress errors
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:6:16: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-fun baz(param: A) {
-               ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:7:23: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val constructor = A()
-                      ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:8:22: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val methodCall = param.hashCode()
-                     ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:9:30: error: class 'a.A' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val supertype = object : A() {}
-                             ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:11:13: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val x = foo()
-            ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:12:13: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val y = bar
-            ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:13:5: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    bar = 239
-    ^
-compiler/testData/compileKotlinAgainstCustomBinaries/releaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck/source.kt:14:12: error: class 'a.AKt' is compiled by the new Kotlin compiler frontend and cannot be loaded by the old compiler
-    val z: TA = ""
-           ^
-COMPILATION_ERROR
+OK

core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/JvmAnnotationNames.java

@@ -31,6 +31,7 @@ public final class JvmAnnotationNames {
     public static final int METADATA_STRICT_VERSION_SEMANTICS_FLAG = 1 << 3;
     public static final int METADATA_JVM_IR_FLAG = 1 << 4;
     public static final int METADATA_JVM_IR_STABLE_ABI_FLAG = 1 << 5;
+    @SuppressWarnings("unused")
     public static final int METADATA_FIR_FLAG = 1 << 6;
     public static final int METADATA_PUBLIC_ABI_FLAG = 1 << 7;
 

core/compiler.common/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedContainerSource.kt

@@ -27,12 +27,10 @@ enum class DeserializedContainerAbiStability {
     // Either the container is stable, or this compiler is configured to ignore ABI stability of dependencies.
     STABLE,
 
-    // The container is unstable because it is compiled with FIR, and this compiler is _not_ configured to ignore that.
-    FIR_UNSTABLE,
-
     // The container is unstable because either:
     // 1) it is compiled with JVM IR prior to 1.4.30, or
     // 2) it is compiled with JVM IR >= 1.4.30 with the `-Xabi-stability=unstable` compiler option,
+    // 3) it is compiled with FIR prior to 2.0.0,
     // and this compiler is _not_ configured to ignore that.
     IR_UNSTABLE,
 }

core/descriptors.jvm/src/org/jetbrains/kotlin/load/kotlin/DeserializedDescriptorResolver.kt

@@ -112,7 +112,6 @@ class DeserializedDescriptorResolver {
     private val KotlinJvmBinaryClass.abiStability: DeserializedContainerAbiStability
         get() = when {
             components.configuration.allowUnstableDependencies -> DeserializedContainerAbiStability.STABLE
-            classHeader.isUnstableFirBinary -> DeserializedContainerAbiStability.FIR_UNSTABLE
             classHeader.isUnstableJvmIrBinary -> DeserializedContainerAbiStability.IR_UNSTABLE
             else -> DeserializedContainerAbiStability.STABLE
         }

core/deserialization.common.jvm/src/org/jetbrains/kotlin/load/kotlin/header/KotlinClassHeader.kt

@@ -62,9 +62,6 @@ class KotlinClassHeader(
     val isUnstableJvmIrBinary: Boolean
         get() = extraInt.has(METADATA_JVM_IR_FLAG) && !extraInt.has(METADATA_JVM_IR_STABLE_ABI_FLAG)
 
-    val isUnstableFirBinary: Boolean
-        get() = extraInt.has(METADATA_FIR_FLAG) && !extraInt.has(METADATA_JVM_IR_STABLE_ABI_FLAG)
-
     val isPreRelease: Boolean
         get() = extraInt.has(METADATA_PRE_RELEASE_FLAG)
 

libraries/stdlib/jvm/runtime/kotlin/Metadata.kt

@@ -75,7 +75,8 @@ public annotation class Metadata(
      * * 4 - this class file is compiled with the new Kotlin compiler backend (JVM IR) introduced in Kotlin 1.4.
      * * 5 - this class file has stable metadata and ABI. This is used only for class files compiled with JVM IR (see flag #4) or FIR (#6),
      *   and prevents metadata incompatibility diagnostics from being reported where the class is used.
-     * * 6 - this class file is compiled with the new Kotlin compiler frontend (FIR).
+     * * 6 - this class file is compiled with the K2 compiler frontend (FIR). Only valid before metadata version 2.0.0.
+     *   Starting from metadata version 2.0.0, this flag is not set anymore, even though FIR is always used.
      * * 7 - this class is used in the scope of an inline function and implicitly part of the public ABI. Only valid from
      *   metadata version 1.6.0.
      */

plugins/kapt4/src/org/jetbrains/kotlin/kapt4/Kapt4StubGenerator.kt

@@ -965,7 +965,7 @@ internal class Kapt4StubGenerator {
             data1 = lightClass.files.map {
                 JvmFileClassUtil.manglePartName(qualifiedName.replace('.', '/'), it.name)
             }.toTypedArray(),
-            extraInt = METADATA_JVM_IR_FLAG or METADATA_FIR_FLAG or METADATA_JVM_IR_STABLE_ABI_FLAG
+            extraInt = METADATA_JVM_IR_FLAG or METADATA_JVM_IR_STABLE_ABI_FLAG
         )
 
     private fun elementMapping(lightClass: PsiClass): Multimap<KtElement, PsiElement> =