FIR: implement Java fields (in provider, type enhancement, scopes)

Related to KT-29218

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirField.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.declarations
+
+import org.jetbrains.kotlin.fir.BaseTransformedType
+import org.jetbrains.kotlin.fir.VisitedSupertype
+import org.jetbrains.kotlin.fir.expressions.FirVariable
+import org.jetbrains.kotlin.fir.visitors.FirVisitor
+
+@BaseTransformedType
+interface FirField : @VisitedSupertype FirDeclaration, FirCallableMember, FirVariable {
+    override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
+        visitor.visitField(this, data)
+
+    override fun <R, D> acceptChildren(visitor: FirVisitor<R, D>, data: D) {
+        super<FirCallableMember>.acceptChildren(visitor, data)
+        initializer?.accept(visitor, data)
+        delegate?.accept(visitor, data)
+    }
+}

compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirFieldSymbol.kt

@@ -0,0 +1,8 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.symbols.impl
+
+typealias FirFieldSymbol = FirPropertySymbol

compiler/fir/tree/visitors/org/jetbrains/kotlin/fir/visitors/FirTransformerGenerated.kt

@@ -64,6 +64,10 @@ abstract class FirTransformer<in D> : FirVisitor<CompositeTransformResult<FirEle
         return transformDeclaration(errorDeclaration, data)
     }
 
+    open fun transformField(field: FirField, data: D): CompositeTransformResult<FirDeclaration> {
+        return transformDeclaration(field, data)
+    }
+
     open fun transformNamedDeclaration(namedDeclaration: FirNamedDeclaration, data: D): CompositeTransformResult<FirDeclaration> {
         return transformDeclaration(namedDeclaration, data)
     }
@@ -496,6 +500,10 @@ abstract class FirTransformer<in D> : FirVisitor<CompositeTransformResult<FirEle
         return transformExpression(expression, data)
     }
 
+    final override fun visitField(field: FirField, data: D): CompositeTransformResult<FirElement> {
+        return transformField(field, data)
+    }
+
     final override fun visitFile(file: FirFile, data: D): CompositeTransformResult<FirElement> {
         return transformFile(file, data)
     }

compiler/fir/tree/visitors/org/jetbrains/kotlin/fir/visitors/FirVisitorGenerated.kt

@@ -64,6 +64,10 @@ abstract class FirVisitor<out R, in D> {
         return visitDeclaration(errorDeclaration, data)
     }
 
+    open fun visitField(field: FirField, data: D): R {
+        return visitDeclaration(field, data)
+    }
+
     open fun visitNamedDeclaration(namedDeclaration: FirNamedDeclaration, data: D): R {
         return visitDeclaration(namedDeclaration, data)
     }

compiler/fir/tree/visitors/org/jetbrains/kotlin/fir/visitors/FirVisitorVoidGenerated.kt

@@ -64,6 +64,10 @@ abstract class FirVisitorVoid : FirVisitor<Unit, Nothing?>() {
         visitDeclaration(errorDeclaration, null)
     }
 
+    open fun visitField(field: FirField) {
+        visitDeclaration(field, null)
+    }
+
     open fun visitNamedDeclaration(namedDeclaration: FirNamedDeclaration) {
         visitDeclaration(namedDeclaration, null)
     }
@@ -496,6 +500,10 @@ abstract class FirVisitorVoid : FirVisitor<Unit, Nothing?>() {
         visitExpression(expression)
     }
 
+    final override fun visitField(field: FirField, data: Nothing?) {
+        visitField(field)
+    }
+
     final override fun visitFile(file: FirFile, data: Nothing?) {
         visitFile(file)
     }