Add abstract source element and switch diagnostics to it

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirPsiTypeProvider.kt

@@ -32,7 +32,6 @@ import org.jetbrains.kotlin.fir.backend.jvm.jvmTypeMapper
 import org.jetbrains.kotlin.fir.declarations.FirClass
 import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
 import org.jetbrains.kotlin.fir.declarations.utils.superConeTypes
-import org.jetbrains.kotlin.fir.psi
 import org.jetbrains.kotlin.fir.resolve.fullyExpandedType
 import org.jetbrains.kotlin.fir.resolve.substitution.AbstractConeSubstitutor
 import org.jetbrains.kotlin.fir.resolve.toSymbol
@@ -40,6 +39,7 @@ import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
 import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.load.kotlin.TypeMappingMode
 import org.jetbrains.kotlin.name.SpecialNames
+import org.jetbrains.kotlin.psi
 import org.jetbrains.kotlin.psi.psiUtil.parents
 import org.jetbrains.kotlin.types.model.SimpleTypeMarker
 import java.text.StringCharacterIterator

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

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.cli.common.fir
 
+import org.jetbrains.kotlin.AbstractKtSourceElement
 import org.jetbrains.kotlin.KtLightSourceElement
 import org.jetbrains.kotlin.KtPsiSourceElement
 import org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport
@@ -12,9 +13,9 @@ import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSourceLocation
 import org.jetbrains.kotlin.cli.common.messages.MessageCollector
 import org.jetbrains.kotlin.cli.common.messages.MessageUtil
 import org.jetbrains.kotlin.diagnostics.DiagnosticUtils
+import org.jetbrains.kotlin.diagnostics.KtDiagnostic
 import org.jetbrains.kotlin.diagnostics.Severity
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirDefaultErrorMessages
-import org.jetbrains.kotlin.diagnostics.KtDiagnostic
 
 object FirDiagnosticsCompilerResultsReporter {
     fun reportDiagnostics(diagnostics: Collection<KtDiagnostic>, reporter: MessageCollector): Boolean {
@@ -51,6 +52,7 @@ object FirDiagnosticsCompilerResultsReporter {
     private fun KtDiagnostic.location(): CompilerMessageSourceLocation? = when (val element = element) {
         is KtPsiSourceElement -> element.location(this)
         is KtLightSourceElement -> element.location(this)
+        else -> element.genericLocation(this)
     }
 
     private fun KtPsiSourceElement.location(diagnostic: KtDiagnostic): CompilerMessageSourceLocation? {
@@ -64,6 +66,12 @@ object FirDiagnosticsCompilerResultsReporter {
         return null
     }
 
+    @Suppress("UNUSED_PARAMETER")
+    private fun AbstractKtSourceElement.genericLocation(diagnostic: KtDiagnostic): CompilerMessageSourceLocation? {
+        // TODO: support generic location
+        return null
+    }
+
     private object DiagnosticComparator : Comparator<KtDiagnostic> {
         override fun compare(o1: KtDiagnostic, o2: KtDiagnostic): Int {
             val element1 = o1.element

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

@@ -6,7 +6,9 @@
 package org.jetbrains.kotlin.fir.backend
 
 import com.intellij.psi.PsiCompiledElement
+import org.jetbrains.kotlin.KtFakeSourceElementKind
 import org.jetbrains.kotlin.KtNodeTypes
+import org.jetbrains.kotlin.KtSourceElement
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.InlineClassRepresentation
 import org.jetbrains.kotlin.descriptors.Modality
@@ -42,7 +44,10 @@ import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.declarations.UNDEFINED_PARAMETER_INDEX
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.expressions.*
+import org.jetbrains.kotlin.ir.expressions.IrConst
+import org.jetbrains.kotlin.ir.expressions.IrConstKind
+import org.jetbrains.kotlin.ir.expressions.IrExpression
+import org.jetbrains.kotlin.ir.expressions.IrStatementOrigin
 import org.jetbrains.kotlin.ir.expressions.impl.*
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
@@ -52,6 +57,7 @@ import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.ir.util.functions
 import org.jetbrains.kotlin.name.SpecialNames
 import org.jetbrains.kotlin.name.StandardClassIds
+import org.jetbrains.kotlin.psi
 import org.jetbrains.kotlin.psi.KtQualifiedExpression
 import org.jetbrains.kotlin.psi.psiUtil.endOffset
 import org.jetbrains.kotlin.psi.psiUtil.startOffsetSkippingComments
@@ -65,7 +71,7 @@ internal fun <T : IrElement> FirElement.convertWithOffsets(
     return source.convertWithOffsets(f)
 }
 
-internal fun <T : IrElement> FirSourceElement?.convertWithOffsets(
+internal fun <T : IrElement> KtSourceElement?.convertWithOffsets(
     f: (startOffset: Int, endOffset: Int) -> T
 ): T {
     val psi = psi
@@ -466,7 +472,7 @@ internal fun FirReference.statementOrigin(): IrStatementOrigin? {
                     IrStatementOrigin.FOR_LOOP_ITERATOR
                 source?.elementType == KtNodeTypes.OPERATION_REFERENCE ->
                     nameToOperationConventionOrigin[symbol.callableId.callableName]
-                source?.kind is FirFakeSourceElementKind.DesugaredComponentFunctionCall ->
+                source?.kind is KtFakeSourceElementKind.DesugaredComponentFunctionCall ->
                     IrStatementOrigin.COMPONENT_N.withIndex(name.asString().removePrefix("component").toInt())
                 else ->
                     null
@@ -631,7 +637,7 @@ fun FirVariableAssignment.getIrAssignmentOrigin(): IrStatementOrigin {
                     IrStatementOrigin.POSTFIX_DECR
             }
 
-            if (calleeReference.source?.kind is FirFakeSourceElementKind &&
+            if (calleeReference.source?.kind is KtFakeSourceElementKind &&
                 calleeReferenceSymbol == rValue.explicitReceiver?.toResolvedCallableSymbol()
             ) {
                 if (callableName == OperatorNameConventions.PLUS) {

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrVisitor.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.fir.backend
 
 import org.jetbrains.kotlin.KtFakeSourceElementKind
 import org.jetbrains.kotlin.KtNodeTypes
+import org.jetbrains.kotlin.KtSourceElement
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibilities
@@ -625,7 +626,7 @@ class Fir2IrVisitor(
     }
 
     private fun List<FirStatement>.convertToIrExpressionOrBlock(
-        source: FirSourceElement?,
+        source: KtSourceElement?,
         origin: IrStatementOrigin? = null
     ): IrExpression {
         if (size == 1) {

compiler/frontend.common-psi/src/org/jetbrains/kotlin/diagnostics/SourceElementPositioningStrategy.kt

@@ -7,29 +7,28 @@ package org.jetbrains.kotlin.diagnostics
 
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.AbstractKtSourceElement
 import org.jetbrains.kotlin.KtLightSourceElement
 import org.jetbrains.kotlin.KtPsiSourceElement
-import org.jetbrains.kotlin.KtSourceElement
-import org.jetbrains.kotlin.diagnostics.AbstractSourceElementPositioningStrategy
-import org.jetbrains.kotlin.diagnostics.KtDiagnostic
-import org.jetbrains.kotlin.diagnostics.LightTreePositioningStrategy
-import org.jetbrains.kotlin.diagnostics.PositioningStrategy
 
 class SourceElementPositioningStrategy(
     private val lightTreeStrategy: LightTreePositioningStrategy,
-    private val psiStrategy: PositioningStrategy<*>
+    private val psiStrategy: PositioningStrategy<*>,
+    private val offsetsOnlyPositioningStrategy: OffsetsOnlyPositioningStrategy = OffsetsOnlyPositioningStrategy(),
 ) : AbstractSourceElementPositioningStrategy() {
     override fun markDiagnostic(diagnostic: KtDiagnostic): List<TextRange> {
         return when (val element = diagnostic.element) {
             is KtPsiSourceElement -> psiStrategy.markDiagnostic(diagnostic)
             is KtLightSourceElement -> lightTreeStrategy.markKtDiagnostic(element, diagnostic)
+            else -> offsetsOnlyPositioningStrategy.markKtDiagnostic(element, diagnostic)
         }
     }
 
-    override fun isValid(element: KtSourceElement): Boolean {
+    override fun isValid(element: AbstractKtSourceElement): Boolean {
         return when (element) {
             is KtPsiSourceElement -> psiStrategy.hackyIsValid(element.psi)
             is KtLightSourceElement -> lightTreeStrategy.isValid(element.lighterASTNode, element.treeStructure)
+            else -> true
         }
     }
 

compiler/frontend.common/src/org/jetbrains/kotlin/KtSourceElement.kt

@@ -190,10 +190,19 @@ sealed class KtFakeSourceElementKind : KtSourceElementKind() {
     object ParameterNameAnnotationCall : KtFakeSourceElementKind()
 }
 
-sealed class KtSourceElement {
+abstract class AbstractKtSourceElement {
-    abstract val elementType: IElementType
     abstract val startOffset: Int
     abstract val endOffset: Int
+}
+
+class KtOffsetsOnlySourceElement(
+    override val startOffset: Int,
+    override val endOffset: Int,
+) : AbstractKtSourceElement()
+
+// TODO: consider renaming to something like AstBasedSourceElement
+sealed class KtSourceElement : AbstractKtSourceElement() {
+    abstract val elementType: IElementType
     abstract val kind: KtSourceElementKind
     abstract val lighterASTNode: LighterASTNode
     abstract val treeStructure: FlyweightCapableTreeStructure<LighterASTNode>
@@ -390,7 +399,7 @@ class KtLightSourceElement(
     }
 }
 
-val KtSourceElement?.psi: PsiElement? get() = (this as? KtPsiSourceElement)?.psi
+val AbstractKtSourceElement?.psi: PsiElement? get() = (this as? KtPsiSourceElement)?.psi
 
 val KtSourceElement?.text: CharSequence?
     get() = when (this) {

compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/AbstractSourceElementPositioningStrategy.kt

@@ -6,27 +6,21 @@
 package org.jetbrains.kotlin.diagnostics
 
 import com.intellij.openapi.util.TextRange
-import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.AbstractKtSourceElement
 
 abstract class AbstractSourceElementPositioningStrategy {
     abstract fun markDiagnostic(diagnostic: KtDiagnostic): List<TextRange>
 
-    abstract fun isValid(element: KtSourceElement): Boolean
+    abstract fun isValid(element: AbstractKtSourceElement): Boolean
 
     companion object {
 
-        private val defaultProxy = object : AbstractSourceElementPositioningStrategy() {
-            lateinit var currentDefault: AbstractSourceElementPositioningStrategy
-
-            override fun markDiagnostic(diagnostic: KtDiagnostic): List<TextRange> = currentDefault.markDiagnostic(diagnostic)
-            override fun isValid(element: KtSourceElement): Boolean = currentDefault.isValid(element)
-        }
-
         @JvmStatic
         fun setDefault(default: AbstractSourceElementPositioningStrategy) {
-            defaultProxy.currentDefault = default
+            DEFAULT = default
         }
 
-        val DEFAULT: AbstractSourceElementPositioningStrategy = defaultProxy
+        var DEFAULT: AbstractSourceElementPositioningStrategy = OffsetsOnlyPositioningStrategy()
+            private set
     }
 }

compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/KtDiagnostic.kt

@@ -8,15 +8,14 @@ package org.jetbrains.kotlin.diagnostics
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiFile
+import org.jetbrains.kotlin.AbstractKtSourceElement
 import org.jetbrains.kotlin.KtLightSourceElement
 import org.jetbrains.kotlin.KtPsiSourceElement
-import org.jetbrains.kotlin.KtSourceElement
-import org.jetbrains.kotlin.diagnostics.*
 
 // ------------------------------ diagnostics ------------------------------
 
 sealed class KtDiagnostic : DiagnosticMarker {
-    abstract val element: KtSourceElement
+    abstract val element: AbstractKtSourceElement
     abstract val severity: Severity
     abstract val factory: AbstractKtDiagnosticFactory
     abstract val positioningStrategy: AbstractSourceElementPositioningStrategy
@@ -206,3 +205,58 @@ data class KtLightDiagnosticWithParameters4<A, B, C, D>(
     override val factory: KtDiagnosticFactory4<A, B, C, D>,
     override val positioningStrategy: AbstractSourceElementPositioningStrategy
 ) : KtDiagnosticWithParameters4<A, B, C, D>(), KtLightDiagnostic
+
+// ------------------------------ light tree diagnostics ------------------------------
+
+interface KtOffsetsOnlyDiagnostic : DiagnosticMarker {
+    val element: AbstractKtSourceElement
+
+    @Deprecated("Should not be called", level = DeprecationLevel.HIDDEN)
+    override val psiElement: PsiElement
+        get() = error("psiElement should not be called on KtOffsetsOnlyDiagnostic")
+}
+
+data class KtOffsetsOnlySimpleDiagnostic(
+    override val element: AbstractKtSourceElement,
+    override val severity: Severity,
+    override val factory: KtDiagnosticFactory0,
+    override val positioningStrategy: AbstractSourceElementPositioningStrategy
+) : KtSimpleDiagnostic(), KtOffsetsOnlyDiagnostic
+
+data class KtOffsetsOnlyDiagnosticWithParameters1<A>(
+    override val element: AbstractKtSourceElement,
+    override val a: A,
+    override val severity: Severity,
+    override val factory: KtDiagnosticFactory1<A>,
+    override val positioningStrategy: AbstractSourceElementPositioningStrategy
+) : KtDiagnosticWithParameters1<A>(), KtOffsetsOnlyDiagnostic
+
+data class KtOffsetsOnlyDiagnosticWithParameters2<A, B>(
+    override val element: AbstractKtSourceElement,
+    override val a: A,
+    override val b: B,
+    override val severity: Severity,
+    override val factory: KtDiagnosticFactory2<A, B>,
+    override val positioningStrategy: AbstractSourceElementPositioningStrategy
+) : KtDiagnosticWithParameters2<A, B>(), KtOffsetsOnlyDiagnostic
+
+data class KtOffsetsOnlyDiagnosticWithParameters3<A, B, C>(
+    override val element: AbstractKtSourceElement,
+    override val a: A,
+    override val b: B,
+    override val c: C,
+    override val severity: Severity,
+    override val factory: KtDiagnosticFactory3<A, B, C>,
+    override val positioningStrategy: AbstractSourceElementPositioningStrategy
+) : KtDiagnosticWithParameters3<A, B, C>(), KtOffsetsOnlyDiagnostic
+
+data class KtOffsetsOnlyDiagnosticWithParameters4<A, B, C, D>(
+    override val element: AbstractKtSourceElement,
+    override val a: A,
+    override val b: B,
+    override val c: C,
+    override val d: D,
+    override val severity: Severity,
+    override val factory: KtDiagnosticFactory4<A, B, C, D>,
+    override val positioningStrategy: AbstractSourceElementPositioningStrategy
+) : KtDiagnosticWithParameters4<A, B, C, D>(), KtOffsetsOnlyDiagnostic

compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/KtDiagnosticFactory.kt

@@ -7,9 +7,9 @@
 
 package org.jetbrains.kotlin.diagnostics
 
+import org.jetbrains.kotlin.AbstractKtSourceElement
 import org.jetbrains.kotlin.KtLightSourceElement
 import org.jetbrains.kotlin.KtPsiSourceElement
-import org.jetbrains.kotlin.KtSourceElement
 import org.jetbrains.kotlin.config.LanguageFeature
 import kotlin.reflect.KClass
 
@@ -39,7 +39,7 @@ class KtDiagnosticFactory0(
 
     @InternalDiagnosticFactoryMethod
     fun on(
-        element: KtSourceElement,
+        element: AbstractKtSourceElement,
         positioningStrategy: AbstractSourceElementPositioningStrategy?
     ): KtSimpleDiagnostic {
         return when (element) {
@@ -47,6 +47,7 @@ class KtDiagnosticFactory0(
                 element, severity, this, positioningStrategy ?: defaultPositioningStrategy
             )
             is KtLightSourceElement -> KtLightSimpleDiagnostic(element, severity, this, positioningStrategy ?: defaultPositioningStrategy)
+            else -> KtOffsetsOnlySimpleDiagnostic(element, severity, this, positioningStrategy ?: defaultPositioningStrategy)
         }
     }
 }
@@ -64,7 +65,7 @@ class KtDiagnosticFactory1<A>(
 
     @InternalDiagnosticFactoryMethod
     fun on(
-        element: KtSourceElement,
+        element: AbstractKtSourceElement,
         a: A,
         positioningStrategy: AbstractSourceElementPositioningStrategy?
     ): KtDiagnosticWithParameters1<A> {
@@ -79,6 +80,9 @@ class KtDiagnosticFactory1<A>(
                 this,
                 positioningStrategy ?: defaultPositioningStrategy
             )
+            else -> KtOffsetsOnlyDiagnosticWithParameters1(
+                element, a, severity, this, positioningStrategy ?: defaultPositioningStrategy
+            )
         }
     }
 }
@@ -97,7 +101,7 @@ class KtDiagnosticFactory2<A, B>(
 
     @InternalDiagnosticFactoryMethod
     fun on(
-        element: KtSourceElement,
+        element: AbstractKtSourceElement,
         a: A,
         b: B,
         positioningStrategy: AbstractSourceElementPositioningStrategy?
@@ -114,6 +118,9 @@ class KtDiagnosticFactory2<A, B>(
                 this,
                 positioningStrategy ?: defaultPositioningStrategy
             )
+            else -> KtOffsetsOnlyDiagnosticWithParameters2(
+                element, a, b, severity, this, positioningStrategy ?: defaultPositioningStrategy
+            )
         }
     }
 }
@@ -133,7 +140,7 @@ class KtDiagnosticFactory3<A, B, C>(
 
     @InternalDiagnosticFactoryMethod
     fun on(
-        element: KtSourceElement,
+        element: AbstractKtSourceElement,
         a: A,
         b: B,
         c: C,
@@ -152,6 +159,9 @@ class KtDiagnosticFactory3<A, B, C>(
                 this,
                 positioningStrategy ?: defaultPositioningStrategy
             )
+            else -> KtOffsetsOnlyDiagnosticWithParameters3(
+                element, a, b, c, severity, this, positioningStrategy ?: defaultPositioningStrategy
+            )
         }
     }
 }
@@ -172,7 +182,7 @@ class KtDiagnosticFactory4<A, B, C, D>(
 
     @InternalDiagnosticFactoryMethod
     fun on(
-        element: KtSourceElement,
+        element: AbstractKtSourceElement,
         a: A,
         b: B,
         c: C,
@@ -193,14 +203,13 @@ class KtDiagnosticFactory4<A, B, C, D>(
                 this,
                 positioningStrategy ?: defaultPositioningStrategy
             )
+            else -> KtOffsetsOnlyDiagnosticWithParameters4(
+                element, a, b, c, d, severity, this, positioningStrategy ?: defaultPositioningStrategy
+            )
         }
     }
 }
 
-private fun incorrectElement(element: KtSourceElement): Nothing {
-    throw IllegalArgumentException("Unknown element type: ${element::class}")
-}
-
 // ------------------------------ factories for deprecation ------------------------------
 
 sealed class KtDiagnosticFactoryForDeprecation<F : AbstractKtDiagnosticFactory>(

compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/KtDiagnosticReportHelpers.kt

@@ -7,10 +7,10 @@
 
 package org.jetbrains.kotlin.diagnostics
 
-import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.AbstractKtSourceElement
 
 fun DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactory0,
     context: DiagnosticContext,
     positioningStrategy: AbstractSourceElementPositioningStrategy? = null
@@ -19,7 +19,7 @@ fun DiagnosticReporter.reportOn(
 }
 
 fun <A : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactory1<A>,
     a: A,
     context: DiagnosticContext,
@@ -29,7 +29,7 @@ fun <A : Any> DiagnosticReporter.reportOn(
 }
 
 fun <A : Any, B : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactory2<A, B>,
     a: A,
     b: B,
@@ -40,7 +40,7 @@ fun <A : Any, B : Any> DiagnosticReporter.reportOn(
 }
 
 fun <A : Any, B : Any, C : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactory3<A, B, C>,
     a: A,
     b: B,
@@ -52,7 +52,7 @@ fun <A : Any, B : Any, C : Any> DiagnosticReporter.reportOn(
 }
 
 fun <A : Any, B : Any, C : Any, D : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactory4<A, B, C, D>,
     a: A,
     b: B,
@@ -65,7 +65,7 @@ fun <A : Any, B : Any, C : Any, D : Any> DiagnosticReporter.reportOn(
 }
 
 fun DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactoryForDeprecation0,
     context: DiagnosticContext,
     positioningStrategy: AbstractSourceElementPositioningStrategy? = null
@@ -74,7 +74,7 @@ fun DiagnosticReporter.reportOn(
 }
 
 fun <A : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactoryForDeprecation1<A>,
     a: A,
     context: DiagnosticContext,
@@ -84,7 +84,7 @@ fun <A : Any> DiagnosticReporter.reportOn(
 }
 
 fun <A : Any, B : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactoryForDeprecation2<A, B>,
     a: A,
     b: B,
@@ -95,7 +95,7 @@ fun <A : Any, B : Any> DiagnosticReporter.reportOn(
 }
 
 fun <A : Any, B : Any, C : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactoryForDeprecation3<A, B, C>,
     a: A,
     b: B,
@@ -107,7 +107,7 @@ fun <A : Any, B : Any, C : Any> DiagnosticReporter.reportOn(
 }
 
 fun <A : Any, B : Any, C : Any, D : Any> DiagnosticReporter.reportOn(
-    source: KtSourceElement?,
+    source: AbstractKtSourceElement?,
     factory: KtDiagnosticFactoryForDeprecation4<A, B, C, D>,
     a: A,
     b: B,

compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/OffsetsOnlyPositioningStrategy.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2010-2021 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.diagnostics
+
+import com.intellij.openapi.util.TextRange
+import org.jetbrains.kotlin.AbstractKtSourceElement
+import org.jetbrains.kotlin.KtLightSourceElement
+import org.jetbrains.kotlin.KtPsiSourceElement
+
+open class OffsetsOnlyPositioningStrategy : AbstractSourceElementPositioningStrategy() {
+    open fun markKtDiagnostic(element: AbstractKtSourceElement, diagnostic: KtDiagnostic): List<TextRange> {
+        return mark(element.startOffset, element.endOffset)
+    }
+
+    open fun mark(
+        startOffset: Int,
+        endOffset: Int,
+    ): List<TextRange> {
+        return markElement(startOffset, endOffset)
+    }
+
+    override fun markDiagnostic(diagnostic: KtDiagnostic): List<TextRange> = markKtDiagnostic(diagnostic.element, diagnostic)
+
+    override fun isValid(element: AbstractKtSourceElement): Boolean = true
+}
+
+fun markElement(
+    startOffset: Int,
+    endOffset: Int,
+): List<TextRange> = markRange(startOffset, endOffset)
+
+fun markRange(
+    startOffset: Int,
+    endOffset: Int,
+): List<TextRange> {
+    return listOf(markSingleElement(startOffset, endOffset))
+}
+
+fun markSingleElement(
+    startOffset: Int,
+    endOffset: Int,
+): TextRange {
+    return TextRange(startOffset, endOffset)
+}

compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/impl/DeduplicatingDiagnosticReporter.kt

@@ -5,7 +5,7 @@
 
 package org.jetbrains.kotlin.diagnostics.impl
 
-import org.jetbrains.kotlin.KtSourceElement
+import org.jetbrains.kotlin.AbstractKtSourceElement
 import org.jetbrains.kotlin.diagnostics.AbstractKtDiagnosticFactory
 import org.jetbrains.kotlin.diagnostics.DiagnosticContext
 import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
@@ -13,7 +13,7 @@ import org.jetbrains.kotlin.diagnostics.KtDiagnostic
 
 class DeduplicatingDiagnosticReporter(private val inner: DiagnosticReporter) : DiagnosticReporter() {
 
-    private val reported = mutableSetOf<Pair<KtSourceElement, AbstractKtDiagnosticFactory>>()
+    private val reported = mutableSetOf<Pair<AbstractKtSourceElement, AbstractKtDiagnosticFactory>>()
 
     override fun report(diagnostic: KtDiagnostic?, context: DiagnosticContext) {
         if (diagnostic != null && reported.add(Pair(diagnostic.element, diagnostic.factory))) {