Support member extension properties, implement KClass.getExtensionProperties()

#KT-6570 Fixed

compiler/testData/codegen/boxWithJava/reflection/kotlinPropertyInheritedInJava/J.java

@@ -0,0 +1,2 @@
+public class J extends K {
+}

compiler/testData/codegen/boxWithJava/reflection/kotlinPropertyInheritedInJava/K.kt

@@ -0,0 +1,40 @@
+import kotlin.reflect.*
+import kotlin.reflect.jvm.*
+
+public open class K {
+    var prop: String = ":("
+
+    val Int.ext: Int get() = this
+}
+
+fun box(): String {
+    val j = J()
+
+    val prop = J::prop
+    if (prop !is KMutableMemberProperty<*, *>) return "Fail instanceof"
+    if (prop.name != "prop") return "Fail name: ${prop.name}"
+    if (prop.get(j) != ":(") return "Fail get before: ${prop[j]}"
+    prop[j] = ":)"
+    if (prop.get(j) != ":)") return "Fail get after: ${prop[j]}"
+
+
+    if (prop == K::prop) return "Fail J::prop == K::prop (these are different properties)"
+
+
+    val klass = javaClass<J>().kotlin
+    val prop2 = klass.getProperties().firstOrNull { it.name == "prop" }
+                ?: "Fail: no 'prop' property in getProperties()"
+    if (prop != prop2) return "Fail: property references from :: and from getProperties() differ"
+    if (prop2 !is KMutableMemberProperty<*, *>) return "Fail instanceof 2"
+    (prop2 as KMutableMemberProperty<J, String>).set(j, "::)")
+    if (prop.get(j) != "::)") return "Fail get after 2: ${prop[j]}"
+
+
+    val ext = klass.getExtensionProperties().firstOrNull { it.name == "ext" }
+              ?: "Fail: no 'ext' property in getProperties()"
+    ext as KMemberExtensionProperty<J, Int, Int>
+    val fortyTwo = ext.get(j, 42)
+    if (fortyTwo != 42) return "Fail ext get: $fortyTwo"
+
+    return "OK"
+}

compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny/memberExtensionToString.kt

@@ -0,0 +1,12 @@
+import kotlin.reflect.jvm.kotlin
+
+class A {
+    var String.id: String
+        get() = this
+        set(value) {}
+}
+
+fun box(): String {
+    val p = javaClass<A>().kotlin.getExtensionProperties().single()
+    return if ("$p" == "var A.(kotlin.String.)id") "OK" else "Fail $p"
+}

compiler/testData/codegen/boxWithStdlib/reflection/properties/getExtensionPropertiesMutableVsReadonly.kt

@@ -0,0 +1,27 @@
+import kotlin.reflect.jvm.kotlin
+import kotlin.reflect.KMutableMemberExtensionProperty
+
+var storage = "before"
+
+class A {
+    val String.readonly: String
+        get() = this
+
+    var String.mutable: String
+        get() = storage
+        set(value) { storage = value }
+}
+
+fun box(): String {
+    val props = javaClass<A>().kotlin.getExtensionProperties()
+    val readonly = props.single { it.name == "readonly" }
+    assert(readonly !is KMutableMemberExtensionProperty<A, *, *>) { "Fail 1: $readonly" }
+    val mutable = props.single { it.name == "mutable" }
+    assert(mutable is KMutableMemberExtensionProperty<A, *, *>) { "Fail 2: $mutable" }
+
+    val a = A()
+    mutable as KMutableMemberExtensionProperty<A, String, String>
+    assert(mutable[a, ""] == "before") { "Fail 3: ${mutable.get(a, "")}" }
+    mutable[a, ""] = "OK"
+    return mutable.get(a, "")
+}

compiler/testData/codegen/boxWithStdlib/reflection/properties/memberAndMemberExtensionWithSameName.kt

@@ -0,0 +1,25 @@
+import kotlin.reflect.jvm.kotlin
+import kotlin.reflect.KMemberProperty
+import kotlin.reflect.KMemberExtensionProperty
+
+class A {
+    val foo: String = "member"
+    val Unit.foo: String get() = "extension"
+}
+
+fun box(): String {
+    run {
+        val foo: KMemberProperty<A, *> = javaClass<A>().kotlin.getProperties().single()
+        assert(foo.name == "foo") { "Fail name: $foo (${foo.name})" }
+        assert(foo.get(A()) == "member") { "Fail value: ${foo[A()]}" }
+    }
+
+    run {
+        val foo: KMemberExtensionProperty<A, *, *> = javaClass<A>().kotlin.getExtensionProperties().single()
+        assert(foo.name == "foo") { "Fail name: $foo (${foo.name})" }
+        foo as KMemberExtensionProperty<A, Unit, *>
+        assert(foo.get(A(), Unit) == "extension") { "Fail value: ${foo[A(), Unit]}" }
+    }
+
+    return "OK"
+}