FIR tree: add dispatch & extension receivers

compiler/fir/psi2fir/tests/org/jetbrains/kotlin/fir/builder/AbstractRawFirBuilderTestCase.kt

@@ -18,6 +18,7 @@ import org.jetbrains.kotlin.fir.*
 import org.jetbrains.kotlin.fir.declarations.FirFile
 import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
 import org.jetbrains.kotlin.fir.expressions.FirWrappedDelegateExpression
+import org.jetbrains.kotlin.fir.expressions.impl.FirNoReceiverExpression
 import org.jetbrains.kotlin.fir.expressions.impl.FirWrappedDelegateExpressionImpl
 import org.jetbrains.kotlin.fir.types.FirTypeRef
 import org.jetbrains.kotlin.fir.visitors.CompositeTransformResult
@@ -80,6 +81,7 @@ abstract class AbstractRawFirBuilderTestCase : KtParsingTestCase(
             val childElement = property.getter.apply { isAccessible = true }.call(this)
 
             when (childElement) {
+                is FirNoReceiverExpression -> continue@propertyLoop
                 is FirElement -> childElement.traverseChildren(result)
                 is List<*> -> childElement.filterIsInstance<FirElement>().forEach { it.traverseChildren(result) }
                 else -> continue@propertyLoop
@@ -129,7 +131,7 @@ abstract class AbstractRawFirBuilderTestCase : KtParsingTestCase(
         override fun visitElement(element: FirElement) {
             // NB: types are reused sometimes (e.g. in accessors)
             if (!result.add(element)) {
-                if (element !is FirTypeRef) {
+                if (element !is FirTypeRef && element !is FirNoReceiverExpression) {
                     val elementDump = StringBuilder().also { element.accept(FirRenderer(it)) }.toString()
                     throw AssertionError("FirElement ${element.javaClass} is visited twice: $elementDump")
                 }
@@ -146,7 +148,7 @@ abstract class AbstractRawFirBuilderTestCase : KtParsingTestCase(
 
         override fun <E : FirElement> transformElement(element: E, data: Unit): CompositeTransformResult<E> {
             if (!result.add(element)) {
-                if (element !is FirTypeRef) {
+                if (element !is FirTypeRef && element !is FirNoReceiverExpression) {
                     val elementDump = StringBuilder().also { element.accept(FirRenderer(it)) }.toString()
                     throw AssertionError("FirElement ${element.javaClass} is visited twice: $elementDump")
                 }

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

@@ -10,10 +10,7 @@ import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationUseSiteTarget
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.expressions.*
-import org.jetbrains.kotlin.fir.expressions.impl.FirElseIfTrueCondition
-import org.jetbrains.kotlin.fir.expressions.impl.FirExpressionStub
-import org.jetbrains.kotlin.fir.expressions.impl.FirLoopJump
-import org.jetbrains.kotlin.fir.expressions.impl.FirUnitExpression
+import org.jetbrains.kotlin.fir.expressions.impl.*
 import org.jetbrains.kotlin.fir.references.FirErrorNamedReference
 import org.jetbrains.kotlin.fir.symbols.*
 import org.jetbrains.kotlin.fir.symbols.impl.FirNamedFunctionSymbol
@@ -827,13 +824,29 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
 
     override fun visitQualifiedAccess(qualifiedAccess: FirQualifiedAccess) {
         val explicitReceiver = qualifiedAccess.explicitReceiver
+        val dispatchReceiver = qualifiedAccess.dispatchReceiver
+        val extensionReceiver = qualifiedAccess.extensionReceiver
+        if (dispatchReceiver !is FirNoReceiverExpression) {
+            print("D|")
+            dispatchReceiver.accept(this)
+            print("|")
+        }
+        if (extensionReceiver !is FirNoReceiverExpression) {
+            print("E|")
+            extensionReceiver.accept(this)
+            print("|")
+        }
         if (explicitReceiver != null) {
-            explicitReceiver.accept(this)
+            if (explicitReceiver !== dispatchReceiver && explicitReceiver !== extensionReceiver) {
+                explicitReceiver.accept(this)
+            }
             if (qualifiedAccess.safe) {
                 print("?.")
             } else {
                 print(".")
             }
+        } else if (dispatchReceiver !is FirNoReceiverExpression || extensionReceiver !is FirNoReceiverExpression) {
+            print(".")
         }
     }
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/FirQualifiedAccess.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.fir.expressions
 
+import org.jetbrains.kotlin.fir.expressions.impl.FirNoReceiverExpression
 import org.jetbrains.kotlin.fir.visitors.FirTransformer
 import org.jetbrains.kotlin.fir.visitors.FirVisitor
 
@@ -13,6 +14,10 @@ interface FirQualifiedAccess : FirResolvable {
 
     val explicitReceiver: FirExpression? get() = null
 
+    val dispatchReceiver: FirExpression get() = FirNoReceiverExpression
+
+    val extensionReceiver: FirExpression get() = FirNoReceiverExpression
+
     fun <D> transformCalleeReference(transformer: FirTransformer<D>, data: D): FirQualifiedAccess
 
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
@@ -21,6 +26,8 @@ interface FirQualifiedAccess : FirResolvable {
     override fun <R, D> acceptChildren(visitor: FirVisitor<R, D>, data: D) {
         calleeReference.accept(visitor, data)
         explicitReceiver?.accept(visitor, data)
+        dispatchReceiver.accept(visitor, data)
+        extensionReceiver.accept(visitor, data)
         super.acceptChildren(visitor, data)
     }
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/FirQualifiedAccessExpression.kt

@@ -19,6 +19,8 @@ abstract class FirQualifiedAccessExpression(
     override fun <R, D> acceptChildren(visitor: FirVisitor<R, D>, data: D) {
         calleeReference.accept(visitor, data)
         explicitReceiver?.accept(visitor, data)
+        dispatchReceiver.accept(visitor, data)
+        extensionReceiver.accept(visitor, data)
         super<FirUnknownTypeExpression>.acceptChildren(visitor, data)
     }
 }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/impl/FirAbstractQualifiedAccess.kt

@@ -19,9 +19,16 @@ abstract class FirAbstractQualifiedAccess(
 
     final override var explicitReceiver: FirExpression? = null
 
+    override var dispatchReceiver: FirExpression = FirNoReceiverExpression
+
+    override var extensionReceiver: FirExpression = FirNoReceiverExpression
+
     override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
         calleeReference = calleeReference.transformSingle(transformer, data)
         explicitReceiver = explicitReceiver?.transformSingle(transformer, data)
+        dispatchReceiver = dispatchReceiver.transformSingle(transformer, data)
+        extensionReceiver = extensionReceiver.transformSingle(transformer, data)
+
         return super<FirAnnotatedStatement>.transformChildren(transformer, data)
     }
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/impl/FirFunctionCallImpl.kt

@@ -23,10 +23,17 @@ class FirFunctionCallImpl(
 
     override var explicitReceiver: FirExpression? = null
 
+    override var dispatchReceiver: FirExpression = FirNoReceiverExpression
+
+    override var extensionReceiver: FirExpression = FirNoReceiverExpression
+
     override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
         typeArguments.transformInplace(transformer, data)
         calleeReference = calleeReference.transformSingle(transformer, data)
         explicitReceiver = explicitReceiver?.transformSingle(transformer, data)
+        dispatchReceiver = dispatchReceiver.transformSingle(transformer, data)
+        extensionReceiver = extensionReceiver.transformSingle(transformer, data)
+
         return super<FirFunctionCall>.transformChildren(transformer, data)
     }
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/impl/FirNoReceiverExpression.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2019 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.expressions.impl
+
+import org.jetbrains.kotlin.fir.expressions.FirExpression
+import org.jetbrains.kotlin.fir.types.FirTypeRef
+import org.jetbrains.kotlin.fir.types.impl.FirImplicitTypeRefImpl
+import org.jetbrains.kotlin.fir.visitors.FirVisitor
+
+object FirNoReceiverExpression : FirExpression(null) {
+    override val typeRef: FirTypeRef = FirImplicitTypeRefImpl(null)
+
+    override fun replaceTypeRef(newTypeRef: FirTypeRef) {}
+
+    override fun <R, D> acceptChildren(visitor: FirVisitor<R, D>, data: D) {}
+}

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/impl/FirQualifiedAccessExpressionImpl.kt

@@ -21,9 +21,15 @@ class FirQualifiedAccessExpressionImpl(
 
     override var explicitReceiver: FirExpression? = null
 
+    override var dispatchReceiver: FirExpression = FirNoReceiverExpression
+
+    override var extensionReceiver: FirExpression = FirNoReceiverExpression
+
     override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
         calleeReference = calleeReference.transformSingle(transformer, data)
         explicitReceiver = explicitReceiver?.transformSingle(transformer, data)
+        dispatchReceiver = dispatchReceiver.transformSingle(transformer, data)
+        extensionReceiver = extensionReceiver.transformSingle(transformer, data)
 
         return super<FirQualifiedAccessExpression>.transformChildren(transformer, data)
     }