FIR: Fix candidate receivers orders when choosing a context receiver

^KT-53257 Fixed

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -17182,6 +17182,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
                 runTest("compiler/testData/codegen/box/extensionFunctions/contextReceivers/propertyCompoundAssignment.kt");
             }
 
+            @Test
+            @TestMetadata("receiversOrder.kt")
+            public void testReceiversOrder() throws Exception {
+                runTest("compiler/testData/codegen/box/extensionFunctions/contextReceivers/receiversOrder.kt");
+            }
+
             @Test
             @TestMetadata("simpleCall.kt")
             public void testSimpleCall() throws Exception {

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

@@ -200,7 +200,7 @@ object CheckContextReceivers : ResolutionStage() {
         }?.takeUnless { it.isEmpty() } ?: return
 
         val receiverGroups: List<List<ImplicitReceiverValue<*>>> =
-            context.bodyResolveContext.towerDataContext.towerDataElements.mapNotNull { towerDataElement ->
+            context.bodyResolveContext.towerDataContext.towerDataElements.asReversed().mapNotNull { towerDataElement ->
                 towerDataElement.implicitReceiver?.let(::listOf) ?: towerDataElement.contextReceiverGroup
             }
 

compiler/testData/codegen/box/extensionFunctions/contextReceivers/receiversOrder.kt

@@ -0,0 +1,27 @@
+// !LANGUAGE: +ContextReceivers
+// TARGET_BACKEND: JVM_IR
+class A(val x: String)
+
+var result = ""
+
+context(A)
+fun foo() {
+    result += x
+}
+
+fun A.bar() {
+    foo()
+    baz {
+        foo()
+    }
+}
+
+fun baz(a: A.() -> Unit) {
+    a(A("K"))
+}
+
+fun box(): String {
+    A("O").bar() // prints "1", "1" while "1", "2" is expected
+
+    return result
+}

compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.ir.txt

@@ -272,7 +272,7 @@ FILE fqName:<root> fileName:/iteratorOperator.kt
               BLOCK_BODY
                 RETURN type=kotlin.Nothing from='local final fun <anonymous> (): <root>.CounterIterator declared in <root>.iterator'
                   CONSTRUCTOR_CALL 'public constructor <init> (_context_receiver_0: <root>.CounterConfig, counter: <root>.Counter) [primary] declared in <root>.CounterIterator' type=<root>.CounterIterator origin=null
-                    _context_receiver_0: GET_VAR '_context_receiver_0: <root>.CounterConfig declared in <root>.iterator' type=<root>.CounterConfig origin=null
+                    _context_receiver_0: GET_VAR '$this$with: <root>.CounterConfig declared in <root>.iterator.<anonymous>' type=<root>.CounterConfig origin=null
                     counter: GET_VAR '<this>: <root>.Counter declared in <root>.iterator' type=<root>.Counter origin=null
   FUN name:box visibility:public modality:FINAL <> () returnType:kotlin.String
     BLOCK_BODY

compiler/testData/ir/irText/declarations/contextReceivers/iteratorOperator.fir.kt.txt

@@ -115,7 +115,7 @@ class CounterIterator : Iterator<Int> {
 
 operator fun Counter.iterator(_context_receiver_0: CounterConfig): CounterIterator {
   return with<CounterConfig, CounterIterator>(receiver = _context_receiver_0, block = local fun CounterConfig.<anonymous>(): CounterIterator {
-    return CounterIterator(_context_receiver_0 = _context_receiver_0, counter = <this>)
+    return CounterIterator(_context_receiver_0 = $this$with, counter = <this>)
   }
 )
 }

compiler/testData/ir/irText/declarations/contextReceivers/lazy.fir.ir.txt

@@ -60,9 +60,9 @@ FILE fqName:<root> fileName:/lazy.kt
                           _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
                           _context_receiver_1: GET_VAR '$this$with: <root>.Lazy<kotlin.CharSequence> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.CharSequence> origin=null
                         CALL 'public final fun test2 <T> (_context_receiver_0: <root>.Lazy<T of <root>.test2>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-                          <T>: kotlin.Int
+                          <T>: kotlin.CharSequence
                           $receiver: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
-                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
+                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.CharSequence> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.CharSequence> origin=null
       CALL 'public final fun with <T, R> (receiver: T of kotlin.StandardKt.with, block: @[ExtensionFunctionType] kotlin.Function1<T of kotlin.StandardKt.with, R of kotlin.StandardKt.with>): R of kotlin.StandardKt.with [inline] declared in kotlin.StandardKt' type=kotlin.Unit origin=null
         <T>: <root>.Lazy<kotlin.CharSequence>
         <R>: kotlin.Unit
@@ -84,9 +84,9 @@ FILE fqName:<root> fileName:/lazy.kt
                           _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
                           _context_receiver_1: GET_VAR '$this$with: <root>.Lazy<kotlin.CharSequence> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.CharSequence> origin=null
                         CALL 'public final fun test2 <T> (_context_receiver_0: <root>.Lazy<T of <root>.test2>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-                          <T>: kotlin.CharSequence
+                          <T>: kotlin.Int
                           $receiver: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
-                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.CharSequence> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.CharSequence> origin=null
+                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
       CALL 'public final fun with <T, R> (receiver: T of kotlin.StandardKt.with, block: @[ExtensionFunctionType] kotlin.Function1<T of kotlin.StandardKt.with, R of kotlin.StandardKt.with>): R of kotlin.StandardKt.with [inline] declared in kotlin.StandardKt' type=kotlin.Unit origin=null
         <T>: <root>.Lazy<T of <root>.f>
         <R>: kotlin.Unit
@@ -105,9 +105,9 @@ FILE fqName:<root> fileName:/lazy.kt
                       $receiver: VALUE_PARAMETER name:$this$with type:<root>.Lazy<kotlin.Int>
                       BLOCK_BODY
                         CALL 'public final fun test2 <T> (_context_receiver_0: <root>.Lazy<T of <root>.test2>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-                          <T>: T of <root>.f
+                          <T>: kotlin.Int
                           $receiver: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
-                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<T of <root>.f> declared in <root>.f.<anonymous>' type=<root>.Lazy<T of <root>.f> origin=null
+                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
       CALL 'public final fun with <T, R> (receiver: T of kotlin.StandardKt.with, block: @[ExtensionFunctionType] kotlin.Function1<T of kotlin.StandardKt.with, R of kotlin.StandardKt.with>): R of kotlin.StandardKt.with [inline] declared in kotlin.StandardKt' type=kotlin.Unit origin=null
         <T>: <root>.Lazy<<root>.Lazy<T of <root>.f>>
         <R>: kotlin.Unit
@@ -126,9 +126,9 @@ FILE fqName:<root> fileName:/lazy.kt
                       $receiver: VALUE_PARAMETER name:$this$with type:<root>.Lazy<kotlin.Int>
                       BLOCK_BODY
                         CALL 'public final fun test2 <T> (_context_receiver_0: <root>.Lazy<T of <root>.test2>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-                          <T>: <root>.Lazy<T of <root>.f>
+                          <T>: kotlin.Int
                           $receiver: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
-                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<<root>.Lazy<T of <root>.f>> declared in <root>.f.<anonymous>' type=<root>.Lazy<<root>.Lazy<T of <root>.f>> origin=null
+                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
                         CALL 'public final fun test3 <T> (_context_receiver_0: <root>.Lazy<<root>.Lazy<T of <root>.test3>>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
                           <T>: T of <root>.f
                           $receiver: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
@@ -151,9 +151,9 @@ FILE fqName:<root> fileName:/lazy.kt
                       $receiver: VALUE_PARAMETER name:$this$with type:<root>.Lazy<<root>.Lazy<T of <root>.f>>
                       BLOCK_BODY
                         CALL 'public final fun test2 <T> (_context_receiver_0: <root>.Lazy<T of <root>.test2>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
-                          <T>: kotlin.Int
+                          <T>: <root>.Lazy<T of <root>.f>
                           $receiver: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
-                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null
+                          _context_receiver_0: GET_VAR '$this$with: <root>.Lazy<<root>.Lazy<T of <root>.f>> declared in <root>.f.<anonymous>.<anonymous>' type=<root>.Lazy<<root>.Lazy<T of <root>.f>> origin=null
                         CALL 'public final fun test3 <T> (_context_receiver_0: <root>.Lazy<<root>.Lazy<T of <root>.test3>>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
                           <T>: T of <root>.f
                           $receiver: GET_VAR '$this$with: <root>.Lazy<kotlin.Int> declared in <root>.f.<anonymous>' type=<root>.Lazy<kotlin.Int> origin=null

compiler/testData/ir/irText/declarations/contextReceivers/lazy.fir.kt.txt

@@ -15,7 +15,7 @@ fun <T : Any?> f(lazy1: Lazy<Int>, lazy2: Lazy<CharSequence>, lazyT: Lazy<T>, la
   with<Lazy<Int>, Unit>(receiver = lazy1, block = local fun Lazy<Int>.<anonymous>() {
     return with<Lazy<CharSequence>, Unit>(receiver = lazy2, block = local fun Lazy<CharSequence>.<anonymous>() {
       test1(_context_receiver_0 = $this$with, _context_receiver_1 = $this$with)
-      $this$with.test2<Int>(_context_receiver_0 = $this$with)
+      $this$with.test2<CharSequence>(_context_receiver_0 = $this$with)
     }
 )
   }
@@ -23,21 +23,21 @@ fun <T : Any?> f(lazy1: Lazy<Int>, lazy2: Lazy<CharSequence>, lazyT: Lazy<T>, la
   with<Lazy<CharSequence>, Unit>(receiver = lazy2, block = local fun Lazy<CharSequence>.<anonymous>() {
     return with<Lazy<Int>, Unit>(receiver = lazy1, block = local fun Lazy<Int>.<anonymous>() {
       test1(_context_receiver_0 = $this$with, _context_receiver_1 = $this$with)
-      $this$with.test2<CharSequence>(_context_receiver_0 = $this$with)
+      $this$with.test2<Int>(_context_receiver_0 = $this$with)
     }
 )
   }
 )
   with<Lazy<T>, Unit>(receiver = lazyT, block = local fun Lazy<T>.<anonymous>() {
     return with<Lazy<Int>, Unit>(receiver = lazy1, block = local fun Lazy<Int>.<anonymous>() {
-      $this$with.test2<T>(_context_receiver_0 = $this$with)
+      $this$with.test2<Int>(_context_receiver_0 = $this$with)
     }
 )
   }
 )
   with<Lazy<Lazy<T>>, Unit>(receiver = lazyLazyT, block = local fun Lazy<Lazy<T>>.<anonymous>() {
     return with<Lazy<Int>, Unit>(receiver = lazy1, block = local fun Lazy<Int>.<anonymous>() {
-      $this$with.test2<Lazy<T>>(_context_receiver_0 = $this$with)
+      $this$with.test2<Int>(_context_receiver_0 = $this$with)
       $this$with.test3<T>(_context_receiver_0 = $this$with)
     }
 )
@@ -45,7 +45,7 @@ fun <T : Any?> f(lazy1: Lazy<Int>, lazy2: Lazy<CharSequence>, lazyT: Lazy<T>, la
 )
   with<Lazy<Int>, Unit>(receiver = lazy1, block = local fun Lazy<Int>.<anonymous>() {
     return with<Lazy<Lazy<T>>, Unit>(receiver = lazyLazyT, block = local fun Lazy<Lazy<T>>.<anonymous>() {
-      $this$with.test2<Int>(_context_receiver_0 = $this$with)
+      $this$with.test2<Lazy<T>>(_context_receiver_0 = $this$with)
       $this$with.test3<T>(_context_receiver_0 = $this$with)
     }
 )

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -17182,6 +17182,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 runTest("compiler/testData/codegen/box/extensionFunctions/contextReceivers/propertyCompoundAssignment.kt");
             }
 
+            @Test
+            @TestMetadata("receiversOrder.kt")
+            public void testReceiversOrder() throws Exception {
+                runTest("compiler/testData/codegen/box/extensionFunctions/contextReceivers/receiversOrder.kt");
+            }
+
             @Test
             @TestMetadata("simpleCall.kt")
             public void testSimpleCall() throws Exception {