FIR: Introduce new classifier descriptors aka 'cones'

compiler/fir/cones/src/org/jetbrains/kotlin/fir/descriptors/ConeClassifierDescriptor.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2010-2018 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.descriptors
+
+import org.jetbrains.kotlin.fir.UnambiguousFqName
+import org.jetbrains.kotlin.fir.types.ConeKotlinType
+
+
+interface ConeDescriptor
+
+interface ConeClassifierDescriptor : ConeDescriptor
+
+interface ConeClassifierDescriptorWithTypeParameters : ConeClassifierDescriptor {
+    val typeParameters: List<ConeTypeParameterDescriptor>
+
+    val fqName: UnambiguousFqName
+}
+
+interface ConeTypeParameterDescriptor : ConeClassifierDescriptor
+
+interface ConeTypeAliasDescriptor : ConeClassifierDescriptorWithTypeParameters {
+    val expandedType: ConeKotlinType
+}
+
+interface ConeClassDescriptor : ConeClassifierDescriptorWithTypeParameters {
+    val superTypes: List<ConeKotlinType>
+    val nestedClassifiers: List<ConeClassifierDescriptor>
+}

compiler/fir/resolve/src/org/jetbrains/kotlin/descriptors/AbstractFirBasedDescriptor.kt

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+/*
+ * Copyright 2010-2018 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.descriptors
+
+import org.jetbrains.kotlin.fir.FirBasedDescriptor
+import org.jetbrains.kotlin.fir.FirDescriptorOwner
+import org.jetbrains.kotlin.fir.FirElement
+
+abstract class AbstractFirBasedDescriptor<E> : FirBasedDescriptor<E> where E : FirElement, E : FirDescriptorOwner<E> {
+
+    override lateinit var fir: E
+
+    override fun bind(e: E) {
+        fir = e
+    }
+}

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

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+/*
+ * Copyright 2010-2018 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
+
+import org.jetbrains.kotlin.fir.descriptors.ConeDescriptor
+
+interface FirBasedDescriptor<E> : ConeDescriptor where E : FirElement, E : FirDescriptorOwner<E> {
+    val fir: E
+    fun bind(e: E)
+}

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

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2010-2018 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
+
+interface FirDescriptorOwner<TElem> where TElem : FirElement, TElem : FirDescriptorOwner<TElem> {
+    val descriptor: FirBasedDescriptor<TElem>
+}