[FIR] Introduce different synthetic origins for FIR declarations

This is needed to be able to precisely distinguish different synthetic
  declarations (like fields for delegates and functions for data classes)
  in fir2ir

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/symbols/KtFirSymbol.kt

@@ -64,10 +64,10 @@ internal tailrec fun FirDeclaration.ktSymbolOrigin(): KtSymbolOrigin = when (ori
     FirDeclarationOrigin.Enhancement -> KtSymbolOrigin.JAVA
     FirDeclarationOrigin.IntersectionOverride -> KtSymbolOrigin.INTERSECTION_OVERRIDE
     FirDeclarationOrigin.Delegated -> KtSymbolOrigin.DELEGATED
-    FirDeclarationOrigin.Synthetic -> {
+    is FirDeclarationOrigin.Synthetic -> {
         when {
             source?.kind == KtFakeSourceElementKind.DataClassGeneratedMembers -> KtSymbolOrigin.SOURCE_MEMBER_GENERATED
-            this is FirValueParameter && this.containingFunctionSymbol.origin == FirDeclarationOrigin.Synthetic -> KtSymbolOrigin.SOURCE_MEMBER_GENERATED
+            this is FirValueParameter && this.containingFunctionSymbol.origin is FirDeclarationOrigin.Synthetic -> KtSymbolOrigin.SOURCE_MEMBER_GENERATED
             this is FirSyntheticProperty || this is FirSyntheticPropertyAccessor -> KtSymbolOrigin.JAVA_SYNTHETIC_PROPERTY
 
             else -> errorWithAttachment("Invalid FirDeclarationOrigin ${origin::class.simpleName}") {

compiler/fir/analysis-tests/testData/resolve/scopes/explicitOverrideOfTwoMembers_java.overrides.txt

@@ -8,7 +8,7 @@ D:
     [Source]: public abstract val x: R|kotlin/Int| from Use site scope of /A [id: 1]
     [Source]: public abstract val x: R|kotlin/String| from Use site scope of /B [id: 2]
   [Java(Source)]: private open field y: R|kotlin/Int| from Java enhancement scope for /D [id: 0]
-  [Synthetic]: public abstract val y: R|kotlin/Int| from Java enhancement scope for /D [id: 0]
+  [JavaProperty]: public abstract val y: R|kotlin/Int| from Java enhancement scope for /D [id: 0]
     [Source]: public abstract val y: R|kotlin/Int| from Use site scope of /A [id: 1]
     [Source]: public abstract val y: R|kotlin/Int| from Use site scope of /B [id: 2]
   [Enhancement]: public abstract fun getX(): R|kotlin/Any!| from Java enhancement scope for /D [id: 0]

compiler/fir/analysis-tests/testData/resolve/scopes/javaFunctionAndKotlinPropertyFromDifferentSupertypes.overrides.txt

@@ -1,4 +1,4 @@
 C:
-  [Synthetic]: public open val foo: R|kotlin/Int| from Java enhancement scope for /C [id: 0]
+  [JavaProperty]: public open val foo: R|kotlin/Int| from Java enhancement scope for /C [id: 0]
     [Source]: public abstract val foo: R|kotlin/Int| from Use site scope of /B [id: 1]
 

compiler/fir/analysis-tests/testData/resolve/scopes/specialFunctionInJava_3.overrides.txt

@@ -1,8 +1,8 @@
 D:
-  [Synthetic]: public open val x: R|kotlin/Int| from Java enhancement scope for /D [id: 0]
+  [JavaProperty]: public open val x: R|kotlin/Int| from Java enhancement scope for /D [id: 0]
-    [Synthetic]: public open val x: R|kotlin/Int| from Java enhancement scope for /B [id: 1]
+    [JavaProperty]: public open val x: R|kotlin/Int| from Java enhancement scope for /B [id: 1]
       [Source]: public open val x: R|kotlin/Int| from Use site scope of /A [id: 2]
-  [Synthetic]: public open val y: R|kotlin/Int| from Java enhancement scope for /D [id: 0]
+  [JavaProperty]: public open val y: R|kotlin/Int| from Java enhancement scope for /D [id: 0]
     [Source]: public open val y: R|kotlin/Int| from Java enhancement scope for /B [id: 1]
       [Source]: public open val y: R|kotlin/Int| from Use site scope of /A [id: 1]
 

compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/session/NativeForwardDeclarationsSymbolProvider.kt

@@ -87,7 +87,7 @@ class NativeForwardDeclarationsSymbolProvider(
 
         buildRegularClass {
             moduleData = forwardDeclarationsModuleData
-            origin = FirDeclarationOrigin.Synthetic
+            origin = FirDeclarationOrigin.Synthetic.ForwardDeclaration
             check(!classId.isNestedClass) { "Expected top-level class when building forward declaration, got $classId" }
             name = classId.shortClassName
             status = FirResolvedDeclarationStatusImpl(

compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt

@@ -598,7 +598,7 @@ class FirElementSerializer private constructor(
     private fun FirFunction.memberKind(): MemberKind {
         return when (origin) {
             FirDeclarationOrigin.Delegated -> MemberKind.DELEGATION
-            FirDeclarationOrigin.Synthetic -> MemberKind.SYNTHESIZED
+            is FirDeclarationOrigin.Synthetic -> MemberKind.SYNTHESIZED
             else -> MemberKind.DECLARATION
         }
     }

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt

@@ -699,7 +699,7 @@ fun FirSession.createFilesWithGeneratedDeclarations(): List<FirFile> {
                     moduleData = this@createFilesWithGeneratedDeclarations.moduleData
                     containingFileSymbol = this@buildFile.symbol
                 }
-                origin = FirDeclarationOrigin.Synthetic
+                origin = FirDeclarationOrigin.Synthetic.PluginFile
                 moduleData = this@createFilesWithGeneratedDeclarations.moduleData
                 packageDirective = buildPackageDirective {
                     this.packageFqName = packageFqName

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrConverter.kt

@@ -137,7 +137,7 @@ class Fir2IrConverter(
                         else ->
                             NaiveSourceBasedFileEntryImpl(file.sourceFile?.path ?: file.sourceFile?.name ?: file.name)
                     }
-            FirDeclarationOrigin.Synthetic -> NaiveSourceBasedFileEntryImpl(file.name)
+            is FirDeclarationOrigin.Synthetic -> NaiveSourceBasedFileEntryImpl(file.name)
             else -> error("Unsupported file origin: ${file.origin}")
         }
         val irFile = IrFileImpl(

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/DataClassMembersGenerator.kt

@@ -160,7 +160,7 @@ class DataClassMembersGenerator(val components: Fir2IrComponents) : Fir2IrCompon
                     for (name in listOf(EQUALS, HASHCODE_NAME, TO_STRING)) {
                         scope.processFunctionsByName(name) {
                             // We won't synthesize a function if there is a user-contributed (non-synthetic) one.
-                            if (it.origin != FirDeclarationOrigin.Synthetic) return@processFunctionsByName
+                            if (it.origin !is FirDeclarationOrigin.Synthetic) return@processFunctionsByName
                             if (it.containingClassLookupTag() != klass.symbol.toLookupTag()) return@processFunctionsByName
                             require(!contains(name)) {
                                 "Two synthetic functions $name were found in data/value class ${klass.name}:\n" +

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassAnySynthesizedMemberScope.kt

@@ -25,6 +25,9 @@ import org.jetbrains.kotlin.fir.declarations.builder.buildSimpleFunction
 import org.jetbrains.kotlin.fir.declarations.builder.buildValueParameter
 import org.jetbrains.kotlin.fir.declarations.impl.FirResolvedDeclarationStatusImpl
 import org.jetbrains.kotlin.fir.declarations.isEquals
+import org.jetbrains.kotlin.fir.declarations.utils.isData
+import org.jetbrains.kotlin.fir.declarations.utils.isInline
+import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.fir.resolve.ScopeSession
 import org.jetbrains.kotlin.fir.resolve.defaultType
 import org.jetbrains.kotlin.fir.resolve.lookupSuperTypes
@@ -52,6 +55,11 @@ class FirClassAnySynthesizedMemberScope(
     klass: FirRegularClass,
     scopeSession: ScopeSession,
 ) : FirContainingNamesAwareScope() {
+    private val originForFunctions = when {
+        klass.isData -> FirDeclarationOrigin.Synthetic.DataClassMember
+        klass.isInline -> FirDeclarationOrigin.Synthetic.ValueClassMember
+        else -> error("This scope should not be created for non-data and non-value class. ${klass.render()}")
+    }
     private val lookupTag = klass.symbol.toLookupTag()
 
     private val baseModuleData = klass.moduleData
@@ -139,7 +147,7 @@ class FirClassAnySynthesizedMemberScope(
             this.valueParameters.add(
                 buildValueParameter {
                     this.name = Name.identifier("other")
-                    origin = FirDeclarationOrigin.Synthetic
+                    origin = originForFunctions
                     moduleData = baseModuleData
                     this.returnTypeRef = FirImplicitNullableAnyTypeRef(null)
                     this.symbol = FirValueParameterSymbol(this.name)
@@ -169,7 +177,7 @@ class FirClassAnySynthesizedMemberScope(
     ) {
         this.source = synthesizedSource
         moduleData = baseModuleData
-        origin = FirDeclarationOrigin.Synthetic
+        origin = originForFunctions
         this.name = name
         status = FirResolvedDeclarationStatusImpl(Visibilities.Public, Modality.OPEN, EffectiveVisibility.Public).apply {
             this.isOperator = isOperator

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/converter/LightTreeRawFirDeclarationBuilder.kt

@@ -1915,7 +1915,7 @@ class LightTreeRawFirDeclarationBuilder(
             buildField {
                 source = explicitDelegation.toFirSourceElement().fakeElement(KtFakeSourceElementKind.ClassDelegationField)
                 moduleData = baseModuleData
-                origin = FirDeclarationOrigin.Synthetic
+                origin = FirDeclarationOrigin.Synthetic.DelegateField
                 name = NameUtils.delegateFieldName(delegateFieldsMap.size)
                 returnTypeRef = firTypeRef
                 symbol = FirFieldSymbol(CallableId(context.currentClassId, name))

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/PsiRawFirBuilder.kt

@@ -880,7 +880,7 @@ open class PsiRawFirBuilder(
             return buildField {
                 source = delegateSource
                 moduleData = baseModuleData
-                origin = FirDeclarationOrigin.Synthetic
+                origin = FirDeclarationOrigin.Synthetic.DelegateField
                 name = NameUtils.delegateFieldName(fieldOrd)
                 returnTypeRef = type
                 symbol = FirFieldSymbol(CallableId(this@PsiRawFirBuilder.context.currentClassId, name))

compiler/fir/raw-fir/raw-fir.common/src/org/jetbrains/kotlin/fir/builder/AbstractRawFirBuilder.kt

@@ -907,7 +907,7 @@ abstract class AbstractRawFirBuilder<T>(val baseSession: FirSession, val context
                 val componentFunction = buildSimpleFunction {
                     source = sourceNode?.toFirSourceElement(KtFakeSourceElementKind.DataClassGeneratedMembers)
                     moduleData = baseModuleData
-                    origin = FirDeclarationOrigin.Synthetic
+                    origin = FirDeclarationOrigin.Synthetic.DataClassMember
                     returnTypeRef = firProperty.returnTypeRef.copyWithNewSourceKind(KtFakeSourceElementKind.DataClassGeneratedMembers)
                     this.name = name
                     status = FirDeclarationStatusImpl(firProperty.visibility, Modality.FINAL).apply {
@@ -1100,7 +1100,7 @@ fun <TBase, TSource : TBase, TParameter : TBase> FirRegularClassBuilder.createDa
         val classTypeRef = createClassTypeRefWithSourceKind(KtFakeSourceElementKind.DataClassGeneratedMembers)
         this.source = toFirSource(sourceElement, KtFakeSourceElementKind.DataClassGeneratedMembers)
         moduleData = this@createDataClassCopyFunction.moduleData
-        origin = FirDeclarationOrigin.Synthetic
+        origin = FirDeclarationOrigin.Synthetic.DataClassMember
         returnTypeRef = classTypeRef
         name = StandardNames.DATA_CLASS_COPY
         status = FirDeclarationStatusImpl(Visibilities.Public, Modality.FINAL)
@@ -1116,7 +1116,7 @@ fun <TBase, TSource : TBase, TParameter : TBase> FirRegularClassBuilder.createDa
                 source = parameterSource
                 containingFunctionSymbol = this@buildSimpleFunction.symbol
                 moduleData = this@createDataClassCopyFunction.moduleData
-                origin = FirDeclarationOrigin.Synthetic
+                origin = FirDeclarationOrigin.Synthetic.DataClassMember
                 returnTypeRef = propertyReturnTypeRef
                 name = propertyName
                 symbol = FirValueParameterSymbol(propertyName)

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/CandidateFactory.kt

@@ -166,7 +166,7 @@ class CandidateFactory private constructor(
             buildErrorFunction {
                 moduleData = context.session.moduleData
                 resolvePhase = FirResolvePhase.BODY_RESOLVE
-                origin = FirDeclarationOrigin.Synthetic
+                origin = FirDeclarationOrigin.Synthetic.Error
                 this.diagnostic = diagnostic
                 symbol = it
             }
@@ -178,7 +178,7 @@ class CandidateFactory private constructor(
             buildErrorProperty {
                 moduleData = context.session.moduleData
                 resolvePhase = FirResolvePhase.BODY_RESOLVE
-                origin = FirDeclarationOrigin.Synthetic
+                origin = FirDeclarationOrigin.Synthetic.Error
                 name = FirErrorPropertySymbol.NAME
                 this.diagnostic = diagnostic
                 symbol = it

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/ConstructorProcessing.kt

@@ -229,7 +229,7 @@ private class TypeAliasConstructorsSubstitutingScope(
             processor(
                 buildConstructorCopy(originalConstructorSymbol.fir) {
                     symbol = FirConstructorSymbol(originalConstructorSymbol.callableId)
-                    origin = FirDeclarationOrigin.Synthetic
+                    origin = FirDeclarationOrigin.Synthetic.TypeAliasConstructor
 
                     this.typeParameters.clear()
                     this.typeParameters += typeParameters.map { buildConstructedClassTypeParameterRef { symbol = it.symbol } }

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

@@ -436,7 +436,7 @@ class FirSyntheticCallGenerator(
     ): FirSimpleFunctionBuilder {
         return FirSimpleFunctionBuilder().apply {
             moduleData = session.moduleData
-            origin = FirDeclarationOrigin.Synthetic
+            origin = FirDeclarationOrigin.Synthetic.FakeFunction
             this.symbol = symbol
             this.name = name
             status = FirDeclarationStatusImpl(Visibilities.Public, Modality.FINAL)

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirDeclarationOrigin.kt

@@ -23,7 +23,17 @@ sealed class FirDeclarationOrigin(
         object Library : Java("Java(Library)")
     }
 
-    object Synthetic : FirDeclarationOrigin()
+    sealed class Synthetic : FirDeclarationOrigin() {
+        object DataClassMember : Synthetic()
+        object ValueClassMember : Synthetic()
+        object JavaProperty : Synthetic()
+        object DelegateField : Synthetic()
+        object PluginFile : Synthetic()
+        object Error : Synthetic()
+        object TypeAliasConstructor : Synthetic()
+        object FakeFunction : Synthetic()
+        object ForwardDeclaration : Synthetic()
+    }
     object DynamicScope : FirDeclarationOrigin()
     object SamConstructor : FirDeclarationOrigin()
     object Enhancement : FirDeclarationOrigin()

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/synthetic/FirSyntheticProperty.kt

@@ -51,7 +51,7 @@ class FirSyntheticProperty(
         get() = null
 
     override val origin: FirDeclarationOrigin
-        get() = FirDeclarationOrigin.Synthetic
+        get() = FirDeclarationOrigin.Synthetic.JavaProperty
 
     override val initializer: FirExpression?
         get() = null

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/synthetic/FirSyntheticPropertyAccessor.kt

@@ -34,7 +34,7 @@ class FirSyntheticPropertyAccessor(
         get() = delegate.moduleData
 
     override val origin: FirDeclarationOrigin
-        get() = FirDeclarationOrigin.Synthetic
+        get() = FirDeclarationOrigin.Synthetic.JavaProperty
 
     override val returnTypeRef: FirTypeRef
         get() = delegate.returnTypeRef

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/utils/FirDeclarationUtil.kt

@@ -34,7 +34,7 @@ inline val FirDeclaration.isFromLibrary: Boolean
 inline val FirDeclaration.isPrecompiled: Boolean
     get() = origin == FirDeclarationOrigin.Precompiled
 inline val FirDeclaration.isSynthetic: Boolean
-    get() = origin == FirDeclarationOrigin.Synthetic
+    get() = origin is FirDeclarationOrigin.Synthetic
 
 // NB: This function checks transitive localness. That is,
 // if a declaration `isNonLocal`, then its parent also `isNonLocal`.