FIR: introduce element kind for source elements

It is needed for FIR IDE to determine if FIR element was built by PSI
or it is generated one

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -21,10 +21,11 @@ import org.jetbrains.kotlin.fir.references.FirReference
 import org.jetbrains.kotlin.fir.references.builder.*
 import org.jetbrains.kotlin.fir.symbols.CallableId
 import org.jetbrains.kotlin.fir.symbols.impl.*
-import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
+import org.jetbrains.kotlin.fir.types.*
-import org.jetbrains.kotlin.fir.types.builder.buildResolvedTypeRef
+import org.jetbrains.kotlin.fir.types.builder.*
 import org.jetbrains.kotlin.fir.types.impl.ConeClassLikeTypeImpl
 import org.jetbrains.kotlin.fir.types.impl.ConeTypeParameterTypeImpl
+import org.jetbrains.kotlin.fir.types.impl.FirResolvedTypeRefImpl
 import org.jetbrains.kotlin.lexer.KtTokens.CLOSING_QUOTE
 import org.jetbrains.kotlin.lexer.KtTokens.OPEN_QUOTE
 import org.jetbrains.kotlin.name.FqName
@@ -35,7 +36,7 @@ import org.jetbrains.kotlin.util.OperatorNameConventions
 //T can be either PsiElement, or LighterASTNode
 abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Context<T> = Context()) {
 
-    abstract fun T.toFirSourceElement(): FirSourceElement
+    abstract fun T.toFirSourceElement(kind: FirSourceElementKind = FirRealSourceElementKind): FirSourceElement
 
     protected val implicitUnitType = baseSession.builtinTypes.unitType
     protected val implicitAnyType = baseSession.builtinTypes.anyType
@@ -168,7 +169,7 @@ abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Conte
 
     private fun T?.toDelegatedSelfType(firClass: FirClassBuilder, symbol: FirClassLikeSymbol<*>): FirResolvedTypeRef {
         return buildResolvedTypeRef {
-            source = this@toDelegatedSelfType?.toFirSourceElement()
+            source = this@toDelegatedSelfType?.toFirSourceElement(FirFakeSourceElementKind.ClassSelfTypeRef)
             type = ConeClassLikeTypeImpl(
                 symbol.toLookupTag(),
                 firClass.typeParameters.map { ConeTypeParameterTypeImpl(it.symbol.toLookupTag(), false) }.toTypedArray(),
@@ -335,7 +336,7 @@ abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Conte
                         SHORT_STRING_TEMPLATE_ENTRY, LONG_STRING_TEMPLATE_ENTRY -> {
                             hasExpressions = true
                             val firExpression = entry.convertTemplateEntry("Incorrect template argument")
-                            val source = firExpression.source
+                            val source = firExpression.source?.withKind(FirFakeSourceElementKind.GeneratedToStringCallOnTemplateEntry)
                             buildFunctionCall {
                                 this.source = source
                                 explicitReceiver = firExpression
@@ -402,22 +403,28 @@ abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Conte
         }
         return buildBlock {
             val baseSource = baseExpression?.toFirSourceElement()
-            source = baseSource
+            val desugaredSource = baseSource?.withKind(FirFakeSourceElementKind.DesugaredIncrementOrDecrement)
+            source = desugaredSource
             val tempName = Name.special("<unary>")
-            val temporaryVariable = generateTemporaryVariable(this@BaseFirBuilder.baseSession, source, tempName, argument.convert())
+            val temporaryVariable = generateTemporaryVariable(
+                this@BaseFirBuilder.baseSession,
+                desugaredSource,
+                tempName,
+                argument.convert()
+            )
             statements += temporaryVariable
             val resultName = Name.special("<unary-result>")
             val resultInitializer = buildFunctionCall {
-                source = baseSource
+                source = desugaredSource
                 calleeReference = buildSimpleNamedReference {
                     source = operationReference?.toFirSourceElement()
                     name = callName
                 }
-                explicitReceiver = generateResolvedAccessExpression(source, temporaryVariable)
+                explicitReceiver = generateResolvedAccessExpression(desugaredSource, temporaryVariable)
             }
-            val resultVar = generateTemporaryVariable(this@BaseFirBuilder.baseSession, source, resultName, resultInitializer)
+            val resultVar = generateTemporaryVariable(this@BaseFirBuilder.baseSession, desugaredSource, resultName, resultInitializer)
             val assignment = argument.generateAssignment(
-                source,
+                desugaredSource,
                 argument,
                 if (prefix && argument.elementType != REFERENCE_EXPRESSION)
                     generateResolvedAccessExpression(source, resultVar)
@@ -438,14 +445,14 @@ abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Conte
                 if (argument.elementType != REFERENCE_EXPRESSION) {
                     statements += resultVar
                     appendAssignment()
-                    statements += generateResolvedAccessExpression(source, resultVar)
+                    statements += generateResolvedAccessExpression(desugaredSource, resultVar)
                 } else {
                     appendAssignment()
-                    statements += generateAccessExpression(source, argument.getReferencedNameAsName())
+                    statements += generateAccessExpression(desugaredSource, argument.getReferencedNameAsName())
                 }
             } else {
                 appendAssignment()
-                statements += generateResolvedAccessExpression(source, temporaryVariable)
+                statements += generateResolvedAccessExpression(desugaredSource, temporaryVariable)
             }
         }
     }
@@ -728,7 +735,7 @@ abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Conte
                 componentIndex++
                 val parameterSource = sourceNode?.toFirSourceElement()
                 val componentFunction = buildSimpleFunction {
-                    source = parameterSource
+                    source = parameterSource?.withKind(FirFakeSourceElementKind.DataClassGeneratedMembers)
                     session = this@DataClassMembersGenerator.session
                     origin = FirDeclarationOrigin.Source
                     returnTypeRef = firProperty.returnTypeRef
@@ -762,7 +769,7 @@ abstract class BaseFirBuilder<T>(val baseSession: FirSession, val context: Conte
                             source = parameterSource
                             session = this@DataClassMembersGenerator.session
                             origin = FirDeclarationOrigin.Source
-                            returnTypeRef = firProperty.returnTypeRef
+                            returnTypeRef = propertyReturnTypeRef
                             name = propertyName
                             symbol = FirVariableSymbol(propertyName)
                             defaultValue = generateComponentAccess(parameterSource, firProperty)

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

@@ -1,11 +1,12 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.builder
 
 import kotlinx.collections.immutable.persistentListOf
+import org.jetbrains.kotlin.fir.FirFakeSourceElementKind
 import org.jetbrains.kotlin.fir.FirFunctionTarget
 import org.jetbrains.kotlin.fir.FirLabel
 import org.jetbrains.kotlin.fir.FirLoopTarget

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -33,10 +33,8 @@ import org.jetbrains.kotlin.fir.symbols.impl.FirDelegateFieldSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirPropertyAccessorSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirVariableSymbol
-import org.jetbrains.kotlin.fir.types.ConeStarProjection
+import org.jetbrains.kotlin.fir.types.*
-import org.jetbrains.kotlin.fir.types.FirTypeRef
+import org.jetbrains.kotlin.fir.types.builder.*
-import org.jetbrains.kotlin.fir.types.builder.buildImplicitTypeRef
-import org.jetbrains.kotlin.fir.types.builder.buildResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.impl.*
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.name.Name
@@ -146,12 +144,13 @@ fun FirExpression.generateNotNullOrOther(
     session: FirSession, other: FirExpression, caseId: String, baseSource: FirSourceElement?,
 ): FirWhenExpression {
     val subjectName = Name.special("<$caseId>")
-    val subjectVariable = generateTemporaryVariable(session, baseSource, subjectName, this)
+    val subjectSource = baseSource?.withKind(FirFakeSourceElementKind.WhenGeneratedSubject)
+    val subjectVariable = generateTemporaryVariable(session, subjectSource, subjectName, this)
 
     @OptIn(FirContractViolation::class)
     val ref = FirExpressionRef<FirWhenExpression>()
     val subjectExpression = buildWhenSubjectExpression {
-        source = baseSource
+        source = subjectSource
         whenRef = ref
     }
 
@@ -160,22 +159,24 @@ fun FirExpression.generateNotNullOrOther(
         this.subject = this@generateNotNullOrOther
         this.subjectVariable = subjectVariable
         branches += buildWhenBranch {
-            source = baseSource
+            val branchSource = baseSource?.withKind(FirFakeSourceElementKind.WhenCondition)
+            source = branchSource
             condition = buildOperatorCall {
-                source = baseSource
+                source = branchSource
                 operation = FirOperation.EQ
                 argumentList = buildBinaryArgumentList(
-                    subjectExpression, buildConstExpression(baseSource, FirConstKind.Null, null)
+                    subjectExpression, buildConstExpression(branchSource, FirConstKind.Null, null)
                 )
             }
             result = buildSingleExpressionBlock(other)
         }
         branches += buildWhenBranch {
-            source = other.source
+            val otherSource = other.source?.withKind(FirFakeSourceElementKind.WhenCondition)
+            source = otherSource
             condition = buildElseIfTrueCondition {
-                source = baseSource
+                source = otherSource
             }
-            result = buildSingleExpressionBlock(generateResolvedAccessExpression(baseSource, subjectVariable))
+            result = buildSingleExpressionBlock(generateResolvedAccessExpression(otherSource, subjectVariable))
         }
     }.also {
         ref.bind(it)
@@ -203,9 +204,9 @@ fun FirExpression.generateContainsOperation(
     if (!inverted) return containsCall
 
     return buildFunctionCall {
-        source = baseSource
+        source = baseSource?.withKind(FirFakeSourceElementKind.DesugaredInvertedContains)
         calleeReference = buildSimpleNamedReference {
-            source = operationReferenceSource
+            source = operationReferenceSource?.withKind(FirFakeSourceElementKind.DesugaredInvertedContains)
             name = OperatorNameConventions.NOT
         }
         explicitReceiver = containsCall
@@ -222,7 +223,12 @@ fun FirExpression.generateComparisonExpression(
         "$operatorToken is not in ${OperatorConventions.COMPARISON_OPERATIONS}"
     }
 
-    val compareToCall = createConventionCall(operationReferenceSource, baseSource, argument, OperatorNameConventions.COMPARE_TO)
+    val compareToCall = createConventionCall(
+        operationReferenceSource,
+        baseSource?.withKind(FirFakeSourceElementKind.GeneratedCompararisonExpression),
+        argument,
+        OperatorNameConventions.COMPARE_TO
+    )
 
     val firOperation = when (operatorToken) {
         KtTokens.LT -> FirOperation.LT
@@ -511,6 +517,6 @@ fun FirModifiableQualifiedAccess.wrapWithSafeCall(receiver: FirExpression): FirS
             bind(checkedSafeCallSubject)
         }
         this.regularQualifiedAccess = this@wrapWithSafeCall
-        this.source = this@wrapWithSafeCall.source
+        this.source = this@wrapWithSafeCall.source?.withKind(FirFakeSourceElementKind.DesugaredSafeCallExpression)
     }
-}
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -12,6 +12,7 @@ import com.intellij.util.diff.FlyweightCapableTreeStructure
 import org.jetbrains.kotlin.KtNodeTypes
 import org.jetbrains.kotlin.fir.FirLightSourceElement
 import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.FirSourceElementKind
 import org.jetbrains.kotlin.fir.builder.BaseFirBuilder
 import org.jetbrains.kotlin.fir.builder.Context
 import org.jetbrains.kotlin.fir.builder.escapedStringToCharacter
@@ -30,7 +31,7 @@ open class BaseConverter(
 ) : BaseFirBuilder<LighterASTNode>(baseSession, context) {
     protected val implicitType = buildImplicitTypeRef()
 
-    override fun LighterASTNode.toFirSourceElement(): FirLightSourceElement {
+    override fun LighterASTNode.toFirSourceElement(kind: FirSourceElementKind): FirLightSourceElement {
         val startOffset = offset + tree.getStartOffset(this)
         val endOffset = offset + tree.getEndOffset(this)
         return toFirLightSourceElement(startOffset, endOffset, tree)

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

@@ -7,9 +7,7 @@ package org.jetbrains.kotlin.fir.builder
 
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibilities
-import org.jetbrains.kotlin.fir.FirExpressionRef
+import org.jetbrains.kotlin.fir.*
-import org.jetbrains.kotlin.fir.FirSession
-import org.jetbrains.kotlin.fir.FirSourceElement
 import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.declarations.FirVariable
 import org.jetbrains.kotlin.fir.declarations.builder.buildProperty
@@ -19,7 +17,6 @@ import org.jetbrains.kotlin.fir.diagnostics.DiagnosticKind
 import org.jetbrains.kotlin.fir.expressions.*
 import org.jetbrains.kotlin.fir.expressions.builder.*
 import org.jetbrains.kotlin.fir.symbols.impl.FirPropertySymbol
-import org.jetbrains.kotlin.fir.toFirPsiSourceElement
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.psi.*
 
@@ -28,15 +25,15 @@ internal fun KtWhenCondition.toFirWhenCondition(
     convert: KtExpression?.(String) -> FirExpression,
     toFirOrErrorTypeRef: KtTypeReference?.() -> FirTypeRef,
 ): FirExpression {
-    val baseSource = this.toFirPsiSourceElement()
+    val firSubjectSource = this.toFirPsiSourceElement(FirFakeSourceElementKind.WhenGeneratedSubject)
     val firSubjectExpression = buildWhenSubjectExpression {
-        source = baseSource
+        source = firSubjectSource
         whenRef = whenRefWithSibject
     }
     return when (this) {
         is KtWhenConditionWithExpression -> {
             buildOperatorCall {
-                source = expression?.toFirPsiSourceElement()
+                source = expression?.toFirPsiSourceElement(FirFakeSourceElementKind.WhenCondition)
                 operation = FirOperation.EQ
                 argumentList = buildBinaryArgumentList(
                     firSubjectExpression, expression.convert("No expression in condition with expression")
@@ -48,26 +45,25 @@ internal fun KtWhenCondition.toFirWhenCondition(
             firRange.generateContainsOperation(
                 firSubjectExpression,
                 isNegated,
-                rangeExpression?.toFirPsiSourceElement(),
+                rangeExpression?.toFirPsiSourceElement(FirFakeSourceElementKind.WhenCondition),
                 operationReference.toFirPsiSourceElement()
             )
         }
         is KtWhenConditionIsPattern -> {
             buildTypeOperatorCall {
-                source = typeReference?.toFirPsiSourceElement()
+                source = this@toFirWhenCondition.toFirPsiSourceElement()
                 operation = if (isNegated) FirOperation.NOT_IS else FirOperation.IS
                 conversionTypeRef = typeReference.toFirOrErrorTypeRef()
                 argumentList = buildUnaryArgumentList(firSubjectExpression)
             }
         }
         else -> {
-            buildErrorExpression(baseSource, ConeSimpleDiagnostic("Unsupported when condition: ${this.javaClass}", DiagnosticKind.Syntax))
+            buildErrorExpression(firSubjectSource, ConeSimpleDiagnostic("Unsupported when condition: ${this.javaClass}", DiagnosticKind.Syntax))
         }
     }
 }
 
 internal fun Array<KtWhenCondition>.toFirWhenCondition(
-    baseSource: FirSourceElement?,
     subject: FirExpressionRef<FirWhenExpression>,
     convert: KtExpression?.(String) -> FirExpression,
     toFirOrErrorTypeRef: KtTypeReference?.() -> FirTypeRef,
@@ -78,7 +74,7 @@ internal fun Array<KtWhenCondition>.toFirWhenCondition(
         firCondition = when (firCondition) {
             null -> firConditionElement
             else -> firCondition.generateLazyLogicalOperation(
-                firConditionElement, false, baseSource,
+                firConditionElement, false, condition.toFirPsiSourceElement(FirFakeSourceElementKind.WhenCondition),
             )
         }
     }
@@ -109,8 +105,9 @@ internal fun generateDestructuringBlock(
                 returnTypeRef = entry.typeReference.toFirOrImplicitTypeRef()
                 this.name = name
                 initializer = buildComponentCall {
-                    source = entrySource
+                    val componentCallSource = entrySource.withKind(FirFakeSourceElementKind.DesugaredComponentFunctionCall)
-                    explicitReceiver = generateResolvedAccessExpression(entrySource, container)
+                    source = componentCallSource
+                    explicitReceiver = generateResolvedAccessExpression(componentCallSource, container)
                     componentIndex = index + 1
                 }
                 this.isVar = isVar

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

@@ -46,6 +46,7 @@ import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.types.expressions.OperatorConventions
 import org.jetbrains.kotlin.util.OperatorNameConventions
 import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
+import java.util.*
 import org.jetbrains.kotlin.utils.addToStdlib.runIf
 import kotlin.collections.contains
 
@@ -61,8 +62,8 @@ class RawFirBuilder(
         return reference.accept(Visitor(), Unit) as FirTypeRef
     }
 
-    override fun PsiElement.toFirSourceElement(): FirPsiSourceElement<*> {
+    override fun PsiElement.toFirSourceElement(kind: FirSourceElementKind): FirPsiSourceElement<*> {
-        return this.toFirPsiSourceElement()
+        return this.toFirPsiSourceElement(kind)
     }
 
     override val PsiElement.elementType: IElementType
@@ -128,7 +129,7 @@ class RawFirBuilder(
 
         private fun KtTypeReference?.toFirOrImplicitType(): FirTypeRef =
             convertSafe() ?: buildImplicitTypeRef {
-                source = this@toFirOrImplicitType?.toFirSourceElement()
+                source = this@toFirOrImplicitType?.toFirSourceElement(FirFakeSourceElementKind.ImplicitTypeRef)
             }
 
         private fun KtTypeReference?.toFirOrUnitType(): FirTypeRef =
@@ -272,7 +273,9 @@ class RawFirBuilder(
                             this@toFirPropertyAccessor?.hasModifier(EXTERNAL_KEYWORD) == true
                 }
             if (this == null || !hasBody()) {
-                val propertySource = property.toFirSourceElement()
+                val propertySource =
+                    if (this != null && hasBody()) property.toFirSourceElement()
+                    else property.toFirPsiSourceElement(FirFakeSourceElementKind.DefaultAccessor)
                 return FirDefaultPropertyAccessor
                     .createGetterOrSetter(
                         propertySource,
@@ -307,7 +310,7 @@ class RawFirBuilder(
                 extractValueParametersTo(this, propertyTypeRef)
                 if (!isGetter && valueParameters.isEmpty()) {
                     valueParameters += buildDefaultSetterValueParameter {
-                        this.source = source
+                        this.source = source.withKind(FirFakeSourceElementKind.DefaultAccessor)
                         session = baseSession
                         origin = FirDeclarationOrigin.Source
                         returnTypeRef = propertyTypeRef
@@ -359,18 +362,17 @@ class RawFirBuilder(
                 isConst = false
                 isLateInit = false
             }
-            val parameterSource = this.toFirSourceElement()
+            val propertySource = toFirSourceElement(FirFakeSourceElementKind.PropertyFromParameter)
-            val propertySource = this@toFirProperty.toFirSourceElement()
             val propertyName = nameAsSafeName
             return buildProperty {
-                source = parameterSource
+                source = propertySource
                 session = baseSession
                 origin = FirDeclarationOrigin.Source
                 returnTypeRef = type
                 receiverTypeRef = null
                 name = propertyName
                 initializer = buildQualifiedAccessExpression {
-                    source = parameterSource
+                    source = propertySource
                     calleeReference = buildPropertyFromParameterResolvedNamedReference {
                         source = propertySource
                         name = propertyName
@@ -381,9 +383,10 @@ class RawFirBuilder(
                 symbol = FirPropertySymbol(callableIdForName(propertyName))
                 isLocal = false
                 this.status = status
-                getter = FirDefaultPropertyGetter(propertySource, baseSession, FirDeclarationOrigin.Source, type, visibility)
+                val defaultAccessorSource = propertySource.withKind(FirFakeSourceElementKind.DefaultAccessor)
+                getter = FirDefaultPropertyGetter(defaultAccessorSource, baseSession, FirDeclarationOrigin.Source, type, visibility)
                 setter = if (isMutable) FirDefaultPropertySetter(
-                    propertySource,
+                    defaultAccessorSource,
                     baseSession,
                     FirDeclarationOrigin.Source,
                     type,
@@ -536,9 +539,10 @@ class RawFirBuilder(
             ownerTypeParameters: List<FirTypeParameterRef>
         ): FirConstructor {
             val constructorCallee = superTypeCallEntry?.calleeExpression?.toFirSourceElement()
-            val constructorSource = (this ?: owner).toFirSourceElement()
+            val constructorSource = this?.toFirSourceElement()
+                ?: owner.toFirPsiSourceElement(FirFakeSourceElementKind.ImplicitConstructor)
             val firDelegatedCall = buildDelegatedConstructorCall {
-                source = constructorCallee ?: constructorSource
+                source = constructorCallee ?: constructorSource.withKind(FirFakeSourceElementKind.DelegatingConstructorCall)
                 constructedTypeRef = delegatedSuperTypeRef
                 isThis = false
                 if (!stubMode) {
@@ -624,7 +628,7 @@ class RawFirBuilder(
                 }
                 initializer = withChildClassName(nameAsSafeName) {
                     buildAnonymousObject {
-                        source = toFirSourceElement()
+                        source = toFirSourceElement(FirFakeSourceElementKind.EnumInitializer)
                         session = baseSession
                         origin = FirDeclarationOrigin.Source
                         classKind = ClassKind.ENUM_ENTRY
@@ -897,11 +901,12 @@ class RawFirBuilder(
         override fun visitLambdaExpression(expression: KtLambdaExpression, data: Unit): FirElement {
             val literal = expression.functionLiteral
             val literalSource = literal.toFirSourceElement()
+            val implicitTypeRefSource = literal.toFirSourceElement(FirFakeSourceElementKind.ImplicitTypeRef)
             val returnType = buildImplicitTypeRef {
-                source = literalSource
+                source = implicitTypeRefSource
             }
             val receiverType = buildImplicitTypeRef {
-                source = literalSource
+                source = implicitTypeRefSource
             }
 
             val target: FirFunctionTarget
@@ -924,7 +929,7 @@ class RawFirBuilder(
                             session = baseSession
                             origin = FirDeclarationOrigin.Source
                             returnTypeRef = buildImplicitTypeRef {
-                                source = multiDeclaration.toFirSourceElement()
+                                source = multiDeclaration.toFirSourceElement(FirFakeSourceElementKind.ImplicitTypeRef)
                             }
                             this.name = name
                             symbol = FirVariableSymbol(name)
@@ -942,7 +947,7 @@ class RawFirBuilder(
                         multiParameter
                     } else {
                         val typeRef = buildImplicitTypeRef {
-                            source = this@buildAnonymousFunction.source
+                            source = implicitTypeRefSource
                         }
                         valueParameter.toFirValueParameter(typeRef)
                     }
@@ -950,7 +955,7 @@ class RawFirBuilder(
                 val expressionSource = expression.toFirSourceElement()
                 label = context.firLabels.pop() ?: context.calleeNamesForLambda.lastOrNull()?.let {
                     buildLabel {
-                        source = expressionSource
+                        source = expressionSource.withKind(FirFakeSourceElementKind.GeneratedLambdaLabel)
                         name = it.asString()
                     }
                 }
@@ -966,9 +971,11 @@ class RawFirBuilder(
                         if (statements.isEmpty()) {
                             statements.add(
                                 buildReturnExpression {
-                                    source = expressionSource
+                                    source = expressionSource.withKind(FirFakeSourceElementKind.ImplicitReturn)
                                     this.target = target
-                                    result = buildUnitExpression { source = expressionSource }
+                                    result = buildUnitExpression {
+                                        source = expressionSource.withKind(FirFakeSourceElementKind.ImplicitUnit)
+                                    }
                                 }
                             )
                         }
@@ -1070,7 +1077,7 @@ class RawFirBuilder(
                     symbol = FirPropertySymbol(propertyName)
                     val delegateBuilder = delegateExpression?.let {
                         FirWrappedDelegateExpressionBuilder().apply {
-                            source = it.toFirSourceElement()
+                            source = it.toFirSourceElement(FirFakeSourceElementKind.WrappedDelegate)
                             expression = it.toFirExpression("Incorrect delegate expression")
                         }
                     }
@@ -1090,7 +1097,8 @@ class RawFirBuilder(
                         addCapturedTypeParameters(this.typeParameters)
                         val delegateBuilder = if (hasDelegate()) {
                             FirWrappedDelegateExpressionBuilder().apply {
-                                source = if (stubMode) null else delegateExpression?.toFirSourceElement()
+                                source =
+                                    if (stubMode) null else delegateExpression?.toFirSourceElement(FirFakeSourceElementKind.WrappedDelegate)
                                 expression = { delegateExpression }.toFirExpression("Should have delegate")
                             }
                         } else null
@@ -1305,7 +1313,7 @@ class RawFirBuilder(
         }
 
         override fun visitReturnExpression(expression: KtReturnExpression, data: Unit): FirElement {
-            val source = expression.toFirSourceElement()
+            val source = expression.toFirSourceElement(FirFakeSourceElementKind.ImplicitUnit)
             val result = expression.returnedExpression?.toFirExpression("Incorrect return expression")
                 ?: buildUnitExpression { this.source = source }
             return result.toReturn(source, expression.getTargetLabel()?.getReferencedName())
@@ -1332,7 +1340,7 @@ class RawFirBuilder(
                 source = expression.toFirSourceElement()
                 val ktCondition = expression.condition
                 branches += buildWhenBranch {
-                    source = ktCondition?.toFirSourceElement()
+                    source = ktCondition?.toFirSourceElement(FirFakeSourceElementKind.WhenCondition)
                     condition = ktCondition.toFirExpression("If statement should have condition")
                     result = expression.then.toFirBlock()
                 }
@@ -1388,7 +1396,6 @@ class RawFirBuilder(
                             buildWhenBranch {
                                 source = entrySource
                                 condition = entry.conditions.toFirWhenCondition(
-                                    entrySource,
                                     ref,
                                     { toFirExpression(it) },
                                     { toFirOrErrorType() },
@@ -1435,16 +1442,16 @@ class RawFirBuilder(
         override fun visitForExpression(expression: KtForExpression, data: Unit?): FirElement {
             val rangeExpression = expression.loopRange.toFirExpression("No range in for loop")
             val ktParameter = expression.loopParameter
-            val loopSource = expression.toFirSourceElement()
+            val fakeSource = expression.toFirPsiSourceElement(FirFakeSourceElementKind.DesugaredForLoop)
             return buildBlock {
-                source = loopSource
+                source = fakeSource
-                val rangeSource = expression.loopRange?.toFirSourceElement()
+                val rangeSource = expression.loopRange?.toFirSourceElement(FirFakeSourceElementKind.DesugaredForLoop)
                 val iteratorVal = generateTemporaryVariable(
                     baseSession, rangeSource, Name.special("<iterator>"),
                     buildFunctionCall {
-                        source = loopSource
+                        source = fakeSource
                         calleeReference = buildSimpleNamedReference {
-                            source = loopSource
+                            source = fakeSource
                             name = Name.identifier("iterator")
                         }
                         explicitReceiver = rangeExpression
@@ -1452,14 +1459,14 @@ class RawFirBuilder(
                 )
                 statements += iteratorVal
                 statements += FirWhileLoopBuilder().apply {
-                    source = loopSource
+                    source = expression.toFirSourceElement()
                     condition = buildFunctionCall {
-                        source = loopSource
+                        source = fakeSource
                         calleeReference = buildSimpleNamedReference {
-                            source = loopSource
+                            source = fakeSource
                             name = Name.identifier("hasNext")
                         }
-                        explicitReceiver = generateResolvedAccessExpression(loopSource, iteratorVal)
+                        explicitReceiver = generateResolvedAccessExpression(fakeSource, iteratorVal)
                     }
                 }.configure {
                     // NB: just body.toFirBlock() isn't acceptable here because we need to add some statements
@@ -1467,7 +1474,7 @@ class RawFirBuilder(
                         is KtBlockExpression -> configureBlockWithoutBuilding(body)
                         null -> FirBlockBuilder()
                         else -> FirBlockBuilder().apply {
-                            source = body.toFirSourceElement()
+                            source = body.toFirSourceElement(FirFakeSourceElementKind.DesugaredForLoop)
                             statements += body.toFirStatement()
                         }
                     }
@@ -1477,12 +1484,12 @@ class RawFirBuilder(
                             session = baseSession, source = expression.loopParameter?.toFirSourceElement(),
                             name = if (multiDeclaration != null) Name.special("<destruct>") else ktParameter.nameAsSafeName,
                             initializer = buildFunctionCall {
-                                source = loopSource
+                                source = fakeSource
                                 calleeReference = buildSimpleNamedReference {
-                                    source = loopSource
+                                    source = fakeSource
                                     name = Name.identifier("next")
                                 }
-                                explicitReceiver = generateResolvedAccessExpression(loopSource, iteratorVal)
+                                explicitReceiver = generateResolvedAccessExpression(fakeSource, iteratorVal)
                             },
                             typeRef = ktParameter.typeReference.toFirOrImplicitType(),
                         )
@@ -1659,7 +1666,7 @@ class RawFirBuilder(
 
                 else -> {
                     buildSimpleNamedReference {
-                        source = defaultSource
+                        source = defaultSource.withKind(FirFakeSourceElementKind.ImplicitInvokeCall)
                         name = OperatorNameConventions.INVOKE
                     } to calleeExpression.toFirExpression("Incorrect invoke receiver")
                 }
@@ -1746,7 +1753,7 @@ class RawFirBuilder(
                 val sourceElement = expression.toFirSourceElement()
                 source = sourceElement
                 calleeReference = buildExplicitThisReference {
-                    source = sourceElement
+                    source = sourceElement.withKind(FirFakeSourceElementKind.ExplicitThisOrSuperReference)
                     labelName = expression.getLabelName()
                 }
             }
@@ -1758,7 +1765,7 @@ class RawFirBuilder(
             return buildQualifiedAccessExpression {
                 this.source = source
                 calleeReference = buildExplicitSuperReference {
-                    this.source
+                    source.withKind(FirFakeSourceElementKind.ExplicitThisOrSuperReference)
                     labelName = expression.getLabelName()
                     superTypeRef = superType.toFirOrImplicitType()
                 }
@@ -1772,12 +1779,12 @@ class RawFirBuilder(
 
         override fun visitLabeledExpression(expression: KtLabeledExpression, data: Unit): FirElement {
             val sourceElement = expression.toFirSourceElement()
-            val labelName = expression.getLabelName()
+            val label = expression.getTargetLabel()
             val size = context.firLabels.size
-            if (labelName != null) {
+            if (label != null) {
                 context.firLabels += buildLabel {
-                    source = sourceElement
+                    source = label.toFirPsiSourceElement()
-                    name = labelName
+                    name = label.getReferencedName()
                 }
             }
             val result = expression.baseExpression?.accept(this, data)

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/ResolveUtils.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -8,8 +8,7 @@ package org.jetbrains.kotlin.fir.resolve
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor
 import org.jetbrains.kotlin.descriptors.ClassKind
-import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.*
-import org.jetbrains.kotlin.fir.FirSourceElement
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.diagnostics.ConeStubDiagnostic
 import org.jetbrains.kotlin.fir.expressions.*
@@ -31,7 +30,6 @@ import org.jetbrains.kotlin.fir.resolve.providers.bindSymbolToLookupTag
 import org.jetbrains.kotlin.fir.resolve.providers.getSymbolByTypeRef
 import org.jetbrains.kotlin.fir.resolve.substitution.AbstractConeSubstitutor
 import org.jetbrains.kotlin.fir.resolve.transformers.body.resolve.resultType
-import org.jetbrains.kotlin.fir.resolvedTypeFromPrototype
 import org.jetbrains.kotlin.fir.scopes.impl.FirDeclaredMemberScopeProvider
 import org.jetbrains.kotlin.fir.scopes.impl.withReplacedConeType
 import org.jetbrains.kotlin.fir.symbols.*
@@ -224,7 +222,7 @@ fun FirFunction<*>.constructFunctionalTypeRef(isSuspend: Boolean = false): FirRe
     val functionalType = createFunctionalType(parameters, receiverTypeRef?.coneTypeSafe(), rawReturnType, isSuspend = isSuspend)
 
     return buildResolvedTypeRef {
-        source = this@constructFunctionalTypeRef.source
+        source = this@constructFunctionalTypeRef.source?.withKind(FirFakeSourceElementKind.ImplicitTypeRef)
         type = functionalType
         this.isSuspend = isSuspend
     }
@@ -327,7 +325,7 @@ fun <T : FirResolvable> BodyResolveComponents.typeFromCallee(access: T): FirReso
     return when (val newCallee = access.calleeReference) {
         is FirErrorNamedReference ->
             buildErrorTypeRef {
-                source = access.source
+                source = access.source?.withKind(FirFakeSourceElementKind.ErrorTypeRef)
                 diagnostic = ConeStubDiagnostic(newCallee.diagnostic)
             }
         is FirNamedReferenceWithCandidate -> {
@@ -392,7 +390,7 @@ fun BodyResolveComponents.transformQualifiedAccessUsingSmartcastInfo(qualifiedAc
     val intersectedType = ConeTypeIntersector.intersectTypes(inferenceComponents.ctx, allTypes)
     // TODO: add check that intersectedType is not equal to original type
     val intersectedTypeRef = buildResolvedTypeRef {
-        source = qualifiedAccessExpression.resultType.source
+        source = qualifiedAccessExpression.resultType.source?.withKind(FirFakeSourceElementKind.SmartCastedTypeRef)
         type = intersectedType
         annotations += qualifiedAccessExpression.resultType.annotations
     }

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

@@ -1,11 +1,12 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.FirElement
+import org.jetbrains.kotlin.fir.FirFakeSourceElementKind
 import org.jetbrains.kotlin.fir.declarations.FirTypedDeclaration
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
 import org.jetbrains.kotlin.fir.expressions.*
@@ -99,7 +100,10 @@ internal fun FirTypedDeclaration.transformTypeToArrayType() {
     val returnType = returnTypeRef.coneTypeUnsafe<ConeKotlinType>()
     transformReturnTypeRef(
         StoreType,
-        returnTypeRef.withReplacedConeType(ConeKotlinTypeProjectionOut(returnType).createArrayOf())
+        returnTypeRef.withReplacedConeType(
+            ConeKotlinTypeProjectionOut(returnType).createArrayOf(),
+            FirFakeSourceElementKind.ArrayTypeFromVarargParameter
+        )
     )
 }
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirDeclarationsResolveTransformer.kt

@@ -1,14 +1,12 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.body.resolve
 
 import org.jetbrains.kotlin.descriptors.ClassKind
-import org.jetbrains.kotlin.fir.FirElement
+import org.jetbrains.kotlin.fir.*
-import org.jetbrains.kotlin.fir.FirFunctionTarget
-import org.jetbrains.kotlin.fir.copy
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.declarations.builder.buildValueParameter
 import org.jetbrains.kotlin.fir.declarations.impl.FirDefaultPropertyAccessor
@@ -27,7 +25,6 @@ import org.jetbrains.kotlin.fir.resolve.inference.FirDelegatedPropertyInferenceS
 import org.jetbrains.kotlin.fir.resolve.inference.extractLambdaInfoFromFunctionalType
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.resolve.transformers.*
-import org.jetbrains.kotlin.fir.resolvedTypeFromPrototype
 import org.jetbrains.kotlin.fir.scopes.impl.FirLocalScope
 import org.jetbrains.kotlin.fir.scopes.impl.FirMemberTypeParameterScope
 import org.jetbrains.kotlin.fir.symbols.constructStarProjectedType
@@ -683,7 +680,7 @@ open class FirDeclarationsResolveTransformer(transformer: FirBodyResolveTransfor
                     override fun <E : FirElement> transformElement(element: E, data: FirExpression): CompositeTransformResult<E> {
                         if (element == lastStatement) {
                             val returnExpression = buildReturnExpression {
-                                source = element.source
+                                source = element.source?.withKind(FirFakeSourceElementKind.ImplicitReturn)
                                 result = lastStatement
                                 target = FirFunctionTarget(null, isLambda = this@addReturn.isLambda).also {
                                     it.bind(this@addReturn)

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirExpressionsResolveTransformer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -307,7 +307,7 @@ open class FirExpressionsResolveTransformer(transformer: FirBodyResolveTransform
             val (leftArgument, rightArgument) = operatorCall.arguments
 
             fun createFunctionCall(name: Name) = buildFunctionCall {
-                source = operatorCall.source
+                source = operatorCall.source?.withKind(FirFakeSourceElementKind.DesugaredCompoundAssignment)
                 explicitReceiver = leftArgument
                 argumentList = buildUnaryArgumentList(rightArgument)
                 calleeReference = buildSimpleNamedReference {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.fir.scopes.impl
 
 import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.fir.FirEffectiveVisibilityImpl
+import org.jetbrains.kotlin.fir.FirFakeSourceElementKind
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.declarations.builder.*
@@ -31,6 +32,7 @@ import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.types.builder.buildResolvedTypeRef
 import org.jetbrains.kotlin.fir.types.coneTypeUnsafe
 import org.jetbrains.kotlin.fir.types.impl.ConeTypeParameterTypeImpl
+import org.jetbrains.kotlin.fir.withKind
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.Name
 
@@ -525,12 +527,12 @@ fun FirTypeRef.withReplacedReturnType(newType: ConeKotlinType?): FirTypeRef {
     }
 }
 
-fun FirTypeRef.withReplacedConeType(newType: ConeKotlinType?): FirResolvedTypeRef {
+fun FirTypeRef.withReplacedConeType(newType: ConeKotlinType?, sourceElementKind: FirFakeSourceElementKind? = null): FirResolvedTypeRef {
     require(this is FirResolvedTypeRef)
     if (newType == null) return this
 
     return buildResolvedTypeRef {
-        source = this@withReplacedConeType.source
+        source = this@withReplacedConeType.source?.withKind(sourceElementKind)
         type = newType
         annotations += this@withReplacedConeType.annotations
     }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/EnumClassUtils.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -32,12 +32,13 @@ private val VALUE = Name.identifier("value")
 fun FirRegularClassBuilder.generateValuesFunction(
     session: FirSession, packageFqName: FqName, classFqName: FqName, makeExpect: Boolean = false
 ) {
+    val sourceElement = source?.withKind(FirFakeSourceElementKind.EnumGeneratedDeclaration)
     declarations += buildSimpleFunction {
-        source = this@generateValuesFunction.source
+        source = sourceElement
         origin = FirDeclarationOrigin.Source
         this.session = session
         returnTypeRef = buildResolvedTypeRef {
-            source = this@generateValuesFunction.source
+            source = sourceElement
             type = ConeClassLikeTypeImpl(
                 ConeClassLikeLookupTagImpl(StandardClassIds.Array),
                 arrayOf(
@@ -60,12 +61,13 @@ fun FirRegularClassBuilder.generateValuesFunction(
 fun FirRegularClassBuilder.generateValueOfFunction(
     session: FirSession, packageFqName: FqName, classFqName: FqName, makeExpect: Boolean = false
 ) {
+    val sourceElement = source?.withKind(FirFakeSourceElementKind.EnumGeneratedDeclaration)
     declarations += buildSimpleFunction {
-        source = this@generateValueOfFunction.source
+        source = sourceElement
         origin = FirDeclarationOrigin.Source
         this.session = session
         returnTypeRef = buildResolvedTypeRef {
-            source = this@generateValueOfFunction.source
+            source = sourceElement
             type = ConeClassLikeTypeImpl(
                 this@generateValueOfFunction.symbol.toLookupTag(),
                 emptyArray(),
@@ -79,7 +81,7 @@ fun FirRegularClassBuilder.generateValueOfFunction(
         }
         symbol = FirNamedFunctionSymbol(CallableId(packageFqName, classFqName, ENUM_VALUE_OF))
         valueParameters += buildValueParameter vp@{
-            source = this@generateValueOfFunction.source
+            source = sourceElement
             origin = FirDeclarationOrigin.Source
             this@vp.session = session
             returnTypeRef = FirImplicitStringTypeRef(source)

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirSourceElement.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2020 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.
  */
 
@@ -10,13 +10,145 @@ import com.intellij.psi.PsiElement
 import com.intellij.psi.tree.IElementType
 import com.intellij.util.diff.FlyweightCapableTreeStructure
 
+sealed class FirSourceElementKind
+
+object FirRealSourceElementKind : FirSourceElementKind()
+
+sealed class FirFakeSourceElementKind : FirSourceElementKind() {
+    // for some fir expression implicit return typeRef is generated
+    // some of them are: break, continue, return, throw, string concat,
+    // destruction parameters, function literals, explicitly boolean expressions
+    object ImplicitTypeRef : FirFakeSourceElementKind()
+
+    // for each class special class self type ref is created
+    // and have a fake source referencing it
+    object ClassSelfTypeRef : FirFakeSourceElementKind()
+
+    // FirErrorTypeRef may be built using unresolved firExpression
+    // and have a fake source referencing it
+    object ErrorTypeRef : FirFakeSourceElementKind()
+
+    // for properties without accessors default getter & setter are generated
+    // they have a fake source which refers to property
+    object DefaultAccessor : FirFakeSourceElementKind()
+
+    // for kt classes without implicit primary constructor one is generated
+    // with a fake source which refers to containing class
+    object ImplicitConstructor : FirFakeSourceElementKind()
+
+    // for constructors which do not have delegated constructor call the fake one is generated
+    // with a fake sources which refers to the original constructor
+    object DelegatingConstructorCall : FirFakeSourceElementKind()
+
+    // for enum entry with bodies the initializer in a form of anonymous object is generated
+    // with a fake sources which refers to the enum entry
+    object EnumInitializer : FirFakeSourceElementKind()
+
+    // for lambdas with implicit return the return statement is generated which is labeled
+    // with a fake sources which refers to the target expression
+    object GeneratedLambdaLabel : FirFakeSourceElementKind()
+
+    // for lambdas & functions with expression bodies the return statement is added
+    // with a fake sources which refers to the return target
+    object ImplicitReturn : FirFakeSourceElementKind()
+
+    // return expression in procedures -> return Unit
+    // with a fake sources which refers to the return statement
+    object ImplicitUnit : FirFakeSourceElementKind()
+
+    // delegates are wrapped into FirWrappedDelegateExpression
+    // with a fake sources which refers to delegated expression
+    object WrappedDelegate : FirFakeSourceElementKind()
+
+    //  `for (i in list) { println(i) }` is converted to
+    //  ```
+    //  val <iterator>: = list.iterator()
+    //  while(<iterator>.hasNext()) {
+    //    val i = <iterator>.next()
+    //    println(i)
+    //  }
+    //  ```
+    //  where the generated WHILE loop has source element of initial FOR loop,
+    //  other generated elements are marked as fake ones
+    object DesugaredForLoop : FirFakeSourceElementKind()
+
+    object ImplicitInvokeCall : FirFakeSourceElementKind()
+
+    // this/super expressions have FirThisReference/FirSuperReference
+    // with a fake sources which refers to this this/super expression
+    object ExplicitThisOrSuperReference : FirFakeSourceElementKind()
+
+    // for enum classes we have valueOf & values functions generated
+    // with a fake sources which refers to this the enum class
+    object EnumGeneratedDeclaration : FirFakeSourceElementKind()
+
+    // when (x) { "abc" -> 42 } --> when(val $subj = x) { $subj == "abc" -> 42 }
+    // where $subj == "42" has fake psi source which refers to "42" as inner expression
+    // and $subj fake source refers to "42" as KtWhenCondition
+    object WhenCondition : FirFakeSourceElementKind()
+
+
+    // for primary constructor parameter the corresponding class property is generated
+    // with a fake sources which refers to this the corresponding parameter
+    object PropertyFromParameter : FirFakeSourceElementKind()
+
+    // if (true) 1 --> if(true) { 1 }
+    // with a fake sources for the block which refers to the wrapped expression
+    object SingleExpressionBlock : FirFakeSourceElementKind()
+
+    // x++ -> x = x.inc()
+    // x = x++ -> x = { val <unary> = x; x = <unary>.inc(); <unary> }
+    object DesugaredIncrementOrDecrement : FirFakeSourceElementKind()
+
+    // x !in list --> !(x in list) where ! and !(x in list) will have a fake source
+    object DesugaredInvertedContains : FirFakeSourceElementKind()
+
+    // for data classes fir generates componentN() & copy() functions
+    // for componentN() functions the source will refer to the corresponding param and will be marked as a fake one
+    // for copy() functions the source will refer class to the param and will be marked as a fake one
+    object DataClassGeneratedMembers : FirFakeSourceElementKind()
+
+    // (vararg x: Int) --> (x: Array<out Int>) where array type ref has a fake source kind
+    object ArrayTypeFromVarargParameter : FirFakeSourceElementKind()
+
+    // val (a,b) = x --> val a = x.component1(); val b = x.component2()
+    // where componentN calls will have the fake source elements refer to the corresponding KtDestructuringDeclarationEntry
+    object DesugaredComponentFunctionCall : FirFakeSourceElementKind()
+
+    // when smart casts applied to the expression, its wrapped into FirExpressionWithSmartcast
+    // which type reference will have a fake source refer to a original source element of it
+    object SmartCastedTypeRef : FirFakeSourceElementKind()
+
+    // for safe call expressions like a?.foo() the FirSafeCallExpression is generated
+    // and it have a fake source
+    object DesugaredSafeCallExpression : FirFakeSourceElementKind()
+
+    // a += 2 --> a = a + 2
+    // where a + 2 will have a fake source
+    object DesugaredCompoundAssignment : FirFakeSourceElementKind()
+
+    //"$a" --> a.toString() where toString call source is marked as a fake one
+    object GeneratedToStringCallOnTemplateEntry : FirFakeSourceElementKind()
+
+    // `a > b` will be wrapped in FirComparisonExpression
+    // with real source which points to initial `a > b` expression
+    // and inner FirFunctionCall will refer to a fake source
+    object GeneratedCompararisonExpression : FirFakeSourceElementKind()
+
+    // a ?: b --> when(val $subj = a) { .... }
+    // where `val $subj = a` has a fake source
+    object WhenGeneratedSubject : FirFakeSourceElementKind()
+}
+
 sealed class FirSourceElement {
     abstract val elementType: IElementType
     abstract val startOffset: Int
     abstract val endOffset: Int
+    abstract val kind: FirSourceElementKind
 }
 
-class FirPsiSourceElement<out P : PsiElement>(val psi: P) : FirSourceElement() {
+
+sealed class FirPsiSourceElement<out P : PsiElement>(val psi: P) : FirSourceElement() {
     override val elementType: IElementType
         get() = psi.node.elementType
 
@@ -27,6 +159,24 @@ class FirPsiSourceElement<out P : PsiElement>(val psi: P) : FirSourceElement() {
         get() = psi.textRange.endOffset
 }
 
+class FirRealPsiSourceElement<out P : PsiElement>(psi: P) : FirPsiSourceElement<P>(psi) {
+    override val kind: FirSourceElementKind get() = FirRealSourceElementKind
+}
+
+class FirFakeSourceElement<out P : PsiElement>(psi: P, override val kind: FirFakeSourceElementKind) : FirPsiSourceElement<P>(psi)
+
+fun FirSourceElement.withKind(newKind: FirSourceElementKind?): FirSourceElement {
+    if (newKind == null) return this
+    return when (this) {
+        is FirLightSourceElement -> this
+        is FirPsiSourceElement<*> -> when (newKind) {
+            kind -> this
+            FirRealSourceElementKind -> FirRealPsiSourceElement(psi)
+            is FirFakeSourceElementKind -> FirFakeSourceElement(psi, newKind)
+        }
+    }
+}
+
 class FirLightSourceElement(
     val element: LighterASTNode,
     override val startOffset: Int,
@@ -35,14 +185,20 @@ class FirLightSourceElement(
 ) : FirSourceElement() {
     override val elementType: IElementType
         get() = element.tokenType
+
+    override val kind: FirSourceElementKind get() = FirRealSourceElementKind
 }
 
 val FirSourceElement?.psi: PsiElement? get() = (this as? FirPsiSourceElement<*>)?.psi
 
 val FirElement.psi: PsiElement? get() = (source as? FirPsiSourceElement<*>)?.psi
+val FirElement.realPsi: PsiElement? get() = (source as? FirRealPsiSourceElement<*>)?.psi
 
 @Suppress("NOTHING_TO_INLINE")
-inline fun PsiElement.toFirPsiSourceElement(): FirPsiSourceElement<*> = FirPsiSourceElement(this)
+inline fun PsiElement.toFirPsiSourceElement(kind: FirSourceElementKind = FirRealSourceElementKind): FirPsiSourceElement<*> = when (kind) {
+    is FirRealSourceElementKind -> FirRealPsiSourceElement(this)
+    is FirFakeSourceElementKind -> FirFakeSourceElement(this, kind)
+}
 
 @Suppress("NOTHING_TO_INLINE")
 inline fun LighterASTNode.toFirLightSourceElement(