[FIR2IR] Provide object receivers for callable references

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

@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.fir.resolve.toSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirRegularClassSymbol
 import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrProperty
@@ -78,12 +79,7 @@ internal class CallAndReferenceGenerator(
                     )
                 }
             }
-        }.apply {
-            applyTypeArguments(callableReferenceAccess)
-            if (callableReferenceAccess.explicitReceiver !is FirResolvedQualifier) {
-                applyReceivers(callableReferenceAccess)
-            }
-        }
+        }.applyTypeArguments(callableReferenceAccess).applyReceivers(callableReferenceAccess)
     }
 
     fun convertToIrCall(qualifiedAccess: FirQualifiedAccess, typeRef: FirTypeRef): IrExpression {
@@ -237,9 +233,18 @@ internal class CallAndReferenceGenerator(
     }
 
     fun convertToGetObject(qualifier: FirResolvedQualifier): IrExpression {
-        val irType = qualifier.typeRef.toIrType()
+        return convertToGetObject(qualifier, callableReferenceMode = false)!!
+    }
+
+    private fun convertToGetObject(qualifier: FirResolvedQualifier, callableReferenceMode: Boolean): IrExpression? {
         val typeRef = qualifier.typeRef as? FirResolvedTypeRef
         val classSymbol = (typeRef?.type as? ConeClassLikeType)?.lookupTag?.toSymbol(session)
+        if (callableReferenceMode && classSymbol is FirRegularClassSymbol) {
+            if (classSymbol.classId != qualifier.classId) {
+                return null
+            }
+        }
+        val irType = qualifier.typeRef.toIrType()
         return qualifier.convertWithOffsets { startOffset, endOffset ->
             if (classSymbol != null) {
                 IrGetObjectValueImpl(
@@ -331,9 +336,16 @@ internal class CallAndReferenceGenerator(
 
     private fun FirQualifiedAccess.findIrReceiver(isDispatch: Boolean): IrExpression? {
         val firReceiver = if (isDispatch) dispatchReceiver else extensionReceiver
-        if (firReceiver is FirResolvedQualifier) return convertToGetObject(firReceiver)
+        if (firReceiver is FirResolvedQualifier) {
+            return convertToGetObject(firReceiver, callableReferenceMode = this is FirCallableReferenceAccess)
+        }
         return firReceiver.takeIf { it !is FirNoReceiverExpression }?.let { visitor.convertToIrExpression(it) }
-            ?: explicitReceiver?.let { visitor.convertToIrExpression(it) } // NB: this applies to the situation when call is unresolved
+            ?: explicitReceiver?.let {
+                if (it is FirResolvedQualifier) {
+                    return convertToGetObject(it, callableReferenceMode = this is FirCallableReferenceAccess)
+                }
+                visitor.convertToIrExpression(it)
+            }
             ?: run {
                 // Object case
                 val callableReference = calleeReference as? FirResolvedNamedReference

compiler/testData/codegen/box/callableReference/bound/boundJvmFieldInInterfaceCompanion.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +JvmFieldInInterface
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
 

compiler/testData/codegen/box/callableReference/bound/companionObjectReceiver.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 class A {
     companion object {
         fun ok() = "OK"

compiler/testData/codegen/box/callableReference/bound/objectReceiver.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 object Singleton {
     fun ok() = "OK"
 }

compiler/testData/codegen/box/jvmField/classFieldReference.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 
 // WITH_RUNTIME

compiler/testData/ir/irText/expressions/callableReferences/boundInnerGenericConstructor.fir.txt

@@ -85,8 +85,7 @@ FILE fqName:test fileName:/boundInnerGenericConstructor.kt
         ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [test/foo]>#' type=IrErrorType
           CONST String type=kotlin.String value="O"
           CONST String type=kotlin.String value="K"
-          FUNCTION_REFERENCE 'public constructor <init> (a: T of test.Foo, b: P of test.Foo.Inner) [primary] declared in test.Foo.Inner' type=kotlin.reflect.KFunction2<T of test.Foo, kotlin.Any?, test.Foo.Inner<kotlin.Any?>> origin=null reflectionTarget=<same>
-            $this: GET_VAR 'val z: test.Foo<kotlin.String> [val] declared in test.box' type=test.Foo<kotlin.String> origin=null
+          ERROR_EXPR 'Cannot bind 1 type arguments to ??? call with 0 type parameters' type=kotlin.reflect.KFunction2<T of test.Foo, kotlin.Any?, test.Foo.Inner<kotlin.Any?>>
       RETURN type=kotlin.Nothing from='public final fun box (): kotlin.String declared in test'
         CALL 'public final fun plus (other: kotlin.Any?): kotlin.String [operator] declared in kotlin' type=kotlin.String origin=PLUS
           $receiver: ERROR_CALL 'Unresolved reference: <Unresolved name: a>#' type=IrErrorType

compiler/testData/ir/irText/expressions/callableReferences/importedFromObject.fir.txt

@@ -1,74 +0,0 @@
-FILE fqName:test fileName:/importedFromObject.kt
-  CLASS OBJECT name:Foo modality:FINAL visibility:public superTypes:[kotlin.Any]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:test.Foo
-    CONSTRUCTOR visibility:private <> () returnType:test.Foo [primary]
-      BLOCK_BODY
-        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
-        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS OBJECT name:Foo modality:FINAL visibility:public superTypes:[kotlin.Any]'
-    PROPERTY name:a visibility:public modality:FINAL [val]
-      FIELD PROPERTY_BACKING_FIELD name:a type:kotlin.String visibility:private [final]
-        EXPRESSION_BODY
-          CONST String type=kotlin.String value=""
-      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-a> visibility:public modality:FINAL <> ($this:test.Foo) returnType:kotlin.String
-        correspondingProperty: PROPERTY name:a visibility:public modality:FINAL [val]
-        $this: VALUE_PARAMETER name:<this> type:test.Foo
-        BLOCK_BODY
-          RETURN type=kotlin.Nothing from='public final fun <get-a> (): kotlin.String declared in test.Foo'
-            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:a type:kotlin.String visibility:private [final]' type=kotlin.String origin=null
-              receiver: GET_VAR '<this>: test.Foo declared in test.Foo.<get-a>' type=test.Foo origin=null
-    FUN name:foo visibility:public modality:FINAL <> ($this:test.Foo) returnType:kotlin.String
-      $this: VALUE_PARAMETER name:<this> type:test.Foo
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun foo (): kotlin.String declared in test.Foo'
-          CONST String type=kotlin.String value=""
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-  PROPERTY name:test1 visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.reflect.KProperty0<kotlin.String> visibility:private [final,static]
-      EXPRESSION_BODY
-        PROPERTY_REFERENCE 'public final a: kotlin.String [val]' field=null getter='public final fun <get-a> (): kotlin.String declared in test.Foo' setter=null type=kotlin.reflect.KProperty0<kotlin.String> origin=null
-          $this: GET_OBJECT 'CLASS OBJECT name:Foo modality:FINAL visibility:public superTypes:[kotlin.Any]' type=test.Foo
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test1> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KProperty0<kotlin.String>
-      correspondingProperty: PROPERTY name:test1 visibility:public modality:FINAL [val]
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-test1> (): kotlin.reflect.KProperty0<kotlin.String> declared in test'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.reflect.KProperty0<kotlin.String> visibility:private [final,static]' type=kotlin.reflect.KProperty0<kotlin.String> origin=null
-  PROPERTY name:test1a visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:test1a type:kotlin.reflect.KProperty0<kotlin.String> visibility:private [final,static]
-      EXPRESSION_BODY
-        PROPERTY_REFERENCE 'public final a: kotlin.String [val]' field=null getter='public final fun <get-a> (): kotlin.String declared in test.Foo' setter=null type=kotlin.reflect.KProperty0<kotlin.String> origin=null
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test1a> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KProperty0<kotlin.String>
-      correspondingProperty: PROPERTY name:test1a visibility:public modality:FINAL [val]
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-test1a> (): kotlin.reflect.KProperty0<kotlin.String> declared in test'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test1a type:kotlin.reflect.KProperty0<kotlin.String> visibility:private [final,static]' type=kotlin.reflect.KProperty0<kotlin.String> origin=null
-  PROPERTY name:test2 visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.reflect.KFunction0<kotlin.String> visibility:private [final,static]
-      EXPRESSION_BODY
-        FUNCTION_REFERENCE 'public final fun foo (): kotlin.String declared in test.Foo' type=kotlin.reflect.KFunction0<kotlin.String> origin=null reflectionTarget=<same>
-          $this: GET_OBJECT 'CLASS OBJECT name:Foo modality:FINAL visibility:public superTypes:[kotlin.Any]' type=test.Foo
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test2> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction0<kotlin.String>
-      correspondingProperty: PROPERTY name:test2 visibility:public modality:FINAL [val]
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-test2> (): kotlin.reflect.KFunction0<kotlin.String> declared in test'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.reflect.KFunction0<kotlin.String> visibility:private [final,static]' type=kotlin.reflect.KFunction0<kotlin.String> origin=null
-  PROPERTY name:test2a visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:test2a type:kotlin.reflect.KFunction0<kotlin.String> visibility:private [final,static]
-      EXPRESSION_BODY
-        FUNCTION_REFERENCE 'public final fun foo (): kotlin.String declared in test.Foo' type=kotlin.reflect.KFunction0<kotlin.String> origin=null reflectionTarget=<same>
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test2a> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction0<kotlin.String>
-      correspondingProperty: PROPERTY name:test2a visibility:public modality:FINAL [val]
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-test2a> (): kotlin.reflect.KFunction0<kotlin.String> declared in test'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test2a type:kotlin.reflect.KFunction0<kotlin.String> visibility:private [final,static]' type=kotlin.reflect.KFunction0<kotlin.String> origin=null

compiler/testData/ir/irText/expressions/callableReferences/importedFromObject.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 package test
 
 import test.Foo.a

compiler/testData/ir/irText/expressions/callableReferences/unboundMemberReferenceWithAdaptedArguments.fir.txt

@@ -69,3 +69,4 @@ FILE fqName:<root> fileName:/unboundMemberReferenceWithAdaptedArguments.kt
     BLOCK_BODY
       ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [/use2]>#' type=IrErrorType
         FUNCTION_REFERENCE 'public final fun foo (vararg xs: kotlin.Int): kotlin.Int declared in <root>.Obj' type=kotlin.reflect.KFunction1<kotlin.IntArray, kotlin.Int> origin=null reflectionTarget=<same>
+          $this: GET_OBJECT 'CLASS OBJECT name:Obj modality:FINAL visibility:public superTypes:[<root>.A]' type=<root>.Obj