Use descriptors for reflection on class properties

- use ConcurrentHashMap as a cache of class loaders to module descriptors
- KClassImpl now has a lazy class descriptor and it manages property creation
  by looking (also lazily) for the property descriptor in the corresponding
  scope
- since deserialized descriptors have full information about where a JVM symbol
  is located and what signature it has, new tests will begin to pass where
  Kotlin model and Java reflection model differ, see classObjectVar.kt

compiler/testData/codegen/boxWithStdlib/callableReference/property/classObjectVar.kt

@@ -0,0 +1,15 @@
+class A {
+    default object B {
+        var state: String = "12345"
+    }
+}
+
+fun box(): String {
+    val p = A.B::state
+
+    if (p.name != "state") return "Fail state: ${p.name}"
+    if (p.get(A.B) != "12345") return "Fail value: ${p.get(A.B)}"
+    p.set(A.B, "OK")
+
+    return p[A.B]
+}

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -741,6 +741,12 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
                 JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/boxWithStdlib/callableReference/property"), Pattern.compile("^(.+)\\.kt$"), true);
             }
 
+            @TestMetadata("classObjectVar.kt")
+            public void testClassObjectVar() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/callableReference/property/classObjectVar.kt");
+                doTestWithStdlib(fileName);
+            }
+
             @TestMetadata("delegated.kt")
             public void testDelegated() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/callableReference/property/delegated.kt");

core/descriptors.runtime/src/org/jetbrains/kotlin/load/java/structure/reflect/reflectStructureUtil.kt

@@ -21,7 +21,9 @@ import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.load.java.JavaVisibilities
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.name.Name
+import java.lang.reflect.Array
 import java.lang.reflect.Modifier
 
 private fun calculateVisibility(modifiers: Int): Visibility {
@@ -34,6 +36,9 @@ private fun calculateVisibility(modifiers: Int): Visibility {
     }
 }
 
+public val Class<*>.classLoader: ClassLoader
+    get() = getClassLoader() ?: ClassLoader.getSystemClassLoader()
+
 public fun Class<*>.isEnumClassOrSpecializedEnumEntryClass(): Boolean =
         javaClass<Enum<*>>().isAssignableFrom(this)
 
@@ -41,4 +46,15 @@ public val Class<*>.fqName: FqName
     get() = classId.asSingleFqName().toSafe()
 
 public val Class<*>.classId: ClassId
-    get() = getDeclaringClass()?.classId?.createNestedClassId(Name.identifier(getSimpleName())) ?: ClassId.topLevel(FqName(getName()))
+    get() = when {
+        isPrimitive() -> throw IllegalArgumentException("Can't compute ClassId for primitive type: $this")
+        isArray() -> throw IllegalArgumentException("Can't compute ClassId for array type: $this")
+        getEnclosingMethod() != null, getEnclosingConstructor() != null, getSimpleName().isEmpty() -> {
+            val fqName = FqName(getName())
+            ClassId(fqName.parent(), FqNameUnsafe.topLevel(fqName.shortName()), /* local = */ true)
+        }
+        else -> getDeclaringClass()?.classId?.createNestedClassId(Name.identifier(getSimpleName())) ?: ClassId.topLevel(FqName(getName()))
+    }
+
+public fun Class<*>.createArrayType(): Class<*> =
+        Array.newInstance(this, 0).javaClass

core/reflection.jvm/src/kotlin/reflect/exceptions.kt

@@ -16,16 +16,20 @@
 
 package kotlin.reflect
 
-suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN")
 public class IllegalPropertyAccessException(cause: IllegalAccessException) : Exception(cause.getMessage()) {
     {
+        [suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN")]
         (this as java.lang.Throwable).initCause(cause)
     }
 }
 
-suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN")
-public class NoSuchPropertyException(cause: Exception) : Exception() {
+public class NoSuchPropertyException(cause: Exception? = null) : Exception() {
     {
-        (this as java.lang.Throwable).initCause(cause)
+        [suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN")]
+        if (cause != null) {
+            (this as java.lang.Throwable).initCause(cause)
+        }
     }
 }
+
+public class KotlinReflectionInternalError(message: String) : Error(message)

core/reflection.jvm/src/kotlin/reflect/jvm/internal/DescriptorBasedProperty.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlin.reflect.jvm.internal
+
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.serialization.ProtoBuf
+import org.jetbrains.kotlin.serialization.deserialization.NameResolver
+import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedPropertyDescriptor
+import org.jetbrains.kotlin.serialization.jvm.JvmProtoBuf
+import java.lang.reflect.Field
+import java.lang.reflect.Method
+import kotlin.reflect.KotlinReflectionInternalError
+
+abstract class DescriptorBasedProperty(computeDescriptor: () -> PropertyDescriptor) {
+    protected abstract val container: KCallableContainerImpl
+
+    data class PropertyProtoData(
+            val proto: ProtoBuf.Callable,
+            val nameResolver: NameResolver,
+            val signature: JvmProtoBuf.JvmPropertySignature
+    )
+
+    protected val descriptor: PropertyDescriptor by ReflectProperties.lazySoft { computeDescriptor() }
+
+    protected val protoData: PropertyProtoData by ReflectProperties.lazyWeak {
+        val property = DescriptorUtils.unwrapFakeOverride(descriptor) as? DeserializedPropertyDescriptor
+                       ?: throw KotlinReflectionInternalError("Member property resolved incorrectly: $descriptor")
+        val proto = property.proto
+        if (!proto.hasExtension(JvmProtoBuf.propertySignature)) {
+            throw KotlinReflectionInternalError("Member property lacks JVM signature: $descriptor")
+        }
+        PropertyProtoData(proto, property.nameResolver, proto.getExtension(JvmProtoBuf.propertySignature))
+    }
+
+    val field: Field? by ReflectProperties.lazySoft {
+        val proto = protoData
+        if (!proto.signature.hasField()) null
+        else container.findFieldBySignature(proto.signature.getField(), proto.nameResolver)
+    }
+
+    val getter: Method? by ReflectProperties.lazySoft {
+        val proto = protoData
+        if (!proto.signature.hasGetter()) null
+        else container.findMethodBySignature(proto.signature.getGetter(), proto.nameResolver)
+    }
+
+    val setter: Method? by ReflectProperties.lazySoft {
+        val proto = protoData
+        if (!proto.signature.hasSetter()) null
+        else container.findMethodBySignature(proto.signature.getSetter(), proto.nameResolver)
+    }
+}

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KCallableContainerImpl.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlin.reflect.jvm.internal
+
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.scopes.JetScope
+import kotlin.reflect.KotlinReflectionInternalError
+
+abstract class KCallableContainerImpl {
+    abstract val jClass: Class<*>
+
+    abstract val scope: JetScope
+
+    protected fun findPropertyDescriptor(name: String): () -> PropertyDescriptor = {
+        val properties = scope.getProperties(Name.identifier(name))
+        if (properties.size() != 1) {
+            throw KotlinReflectionInternalError(
+                    if (properties.isEmpty()) "Property $name not resolved in $this"
+                    else "${properties.size()} properties with name $name resolved in $this"
+            )
+        }
+
+        properties.single() as PropertyDescriptor
+    }
+}

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KClassImpl.kt

@@ -16,8 +16,15 @@
 
 package kotlin.reflect.jvm.internal
 
-import kotlin.reflect.*
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.load.java.structure.reflect.classId
+import org.jetbrains.kotlin.resolve.scopes.JetScope
+import org.jetbrains.kotlin.serialization.deserialization.findClassAcrossModuleDependencies
 import kotlin.jvm.internal.KotlinClass
+import kotlin.reflect.KClass
+import kotlin.reflect.KMemberProperty
+import kotlin.reflect.KMutableMemberProperty
+import kotlin.reflect.KotlinReflectionInternalError
 
 enum class KClassOrigin {
     BUILT_IN
@@ -25,10 +32,21 @@ enum class KClassOrigin {
     FOREIGN
 }
 
-class KClassImpl<T>(val jClass: Class<T>) : KClass<T> {
+class KClassImpl<T>(override val jClass: Class<T>) : KCallableContainerImpl(), KClass<T> {
     // Don't use kotlin.properties.Delegates here because it's a Kotlin class which will invoke KClassImpl() in <clinit>,
     // resulting in infinite recursion
 
+    val descriptor by ReflectProperties.lazySoft {(): ClassDescriptor ->
+        val moduleData = jClass.getOrCreateModule()
+
+        val found = moduleData.module.findClassAcrossModuleDependencies(jClass.classId)
+        if (found != null) return@lazySoft found
+
+        throw KotlinReflectionInternalError("Class not resolved: $jClass")
+    }
+
+    override val scope: JetScope get() = descriptor.getDefaultType().getMemberScope()
+
     private val origin by ReflectProperties.lazy {(): KClassOrigin ->
         if (jClass.isAnnotationPresent(javaClass<KotlinClass>())) {
             KClassOrigin.KOTLIN
@@ -39,21 +57,27 @@ class KClassImpl<T>(val jClass: Class<T>) : KClass<T> {
         }
     }
 
-    fun memberProperty(name: String): KMemberProperty<T, *> =
-            if (origin === KClassOrigin.KOTLIN) {
-                KMemberPropertyImpl<T, Any>(name, this)
-            }
-            else {
-                KForeignMemberProperty<T, Any>(name, this)
-            }
+    fun memberProperty(name: String): KMemberProperty<T, *> {
+        val computeDescriptor = findPropertyDescriptor(name)
 
-    fun mutableMemberProperty(name: String): KMutableMemberProperty<T, *> =
-            if (origin === KClassOrigin.KOTLIN) {
-                KMutableMemberPropertyImpl<T, Any>(name, this)
-            }
-            else {
-                KMutableForeignMemberProperty<T, Any>(name, this)
-            }
+        if (origin === KClassOrigin.KOTLIN) {
+            return KMemberPropertyImpl<T, Any>(this, computeDescriptor)
+        }
+        else {
+            return KForeignMemberProperty<T, Any>(name, this)
+        }
+    }
+
+    fun mutableMemberProperty(name: String): KMutableMemberProperty<T, *> {
+        val computeDescriptor = findPropertyDescriptor(name)
+
+        if (origin === KClassOrigin.KOTLIN) {
+            return KMutableMemberPropertyImpl<T, Any>(this, computeDescriptor)
+        }
+        else {
+            return KMutableForeignMemberProperty<T, Any>(name, this)
+        }
+    }
 
     override fun equals(other: Any?): Boolean =
             other is KClassImpl<*> && jClass == other.jClass

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KMemberPropertyImpl.kt

@@ -16,39 +16,22 @@
 
 package kotlin.reflect.jvm.internal
 
-import java.lang.reflect.*
-import kotlin.reflect.*
-
-// TODO: properties of built-in classes
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import kotlin.reflect.IllegalPropertyAccessException
+import kotlin.reflect.KMemberProperty
+import kotlin.reflect.KMutableMemberProperty
 
 open class KMemberPropertyImpl<T : Any, out R>(
-        override val name: String,
-        protected val owner: KClassImpl<T>
-) : KMemberProperty<T, R>, KPropertyImpl<R> {
-    // TODO: extract, make lazy (weak?), use our descriptors knowledge
-    override val field: Field?
-    override val getter: Method?
-
-    {
-        try {
-            field = owner.jClass.getDeclaredField(name)
-        }
-        catch (e: NoSuchFieldException) {
-            field = null
-        }
-
-        try {
-            getter = owner.jClass.getMaybeDeclaredMethod(getterName(name))
-        }
-        catch (e: NoSuchMethodException) {
-            if (field == null) throw NoSuchPropertyException(e)
-            getter = null
-        }
-    }
+        override val container: KClassImpl<T>,
+        computeDescriptor: () -> PropertyDescriptor
+) : DescriptorBasedProperty(computeDescriptor), KMemberProperty<T, R>, KPropertyImpl<R> {
+    override val name: String get() = descriptor.getName().asString()
 
     override fun get(receiver: T): R {
         try {
-            return (if (getter != null) getter!!(receiver) else field!!.get(receiver)) as R
+            val getter = getter
+            [suppress("UNCHECKED_CAST")]
+            return if (getter != null) getter(receiver) as R else field!!.get(receiver) as R
         }
         catch (e: IllegalAccessException) {
             throw IllegalPropertyAccessException(e)
@@ -56,42 +39,27 @@ open class KMemberPropertyImpl<T : Any, out R>(
     }
 
     override fun equals(other: Any?): Boolean =
-            other is KMemberPropertyImpl<*, *> && name == other.name && owner == other.owner
+            other is KMemberPropertyImpl<*, *> && descriptor == other.descriptor
 
     override fun hashCode(): Int =
-            name.hashCode() * 31 + owner.hashCode()
+            descriptor.hashCode()
 
-    // TODO: include visibility, return type
     override fun toString(): String =
-            "val ${owner.jClass.getName()}.$name"
+            ReflectionObjectRenderer.renderProperty(descriptor)
 }
 
+
 class KMutableMemberPropertyImpl<T : Any, R>(
-        name: String,
-        owner: KClassImpl<T>
-) : KMutableMemberProperty<T, R>, KMutablePropertyImpl<R>, KMemberPropertyImpl<T, R>(name, owner) {
-    override val setter: Method?
-
-    {
-        try {
-            val returnType = if (getter != null) getter.getReturnType() else field!!.getType()
-            setter = owner.jClass.getMaybeDeclaredMethod(setterName(name), returnType)
-        }
-        catch (e: NoSuchMethodException) {
-            if (field == null) throw NoSuchPropertyException(e)
-            setter = null
-        }
-    }
-
+        container: KClassImpl<T>,
+        computeDescriptor: () -> PropertyDescriptor
+) : KMemberPropertyImpl<T, R>(container, computeDescriptor), KMutableMemberProperty<T, R>, KMutablePropertyImpl<R> {
     override fun set(receiver: T, value: R) {
         try {
-            if (setter != null) setter!!(receiver, value) else field!!.set(receiver, value)
+            val setter = setter
+            if (setter != null) setter(receiver, value) else field!!.set(receiver, value)
         }
         catch (e: IllegalAccessException) {
             throw IllegalPropertyAccessException(e)
         }
     }
-
-    override fun toString(): String =
-            "var ${owner.jClass.getName()}.$name"
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/ReflectionObjectRenderer.kt

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlin.reflect.jvm.internal
+
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.ReceiverParameterDescriptor
+import org.jetbrains.kotlin.renderer.DescriptorRenderer
+
+object ReflectionObjectRenderer {
+    private val renderer = DescriptorRenderer.FQ_NAMES_IN_TYPES
+
+    // TODO: include visibility, return type
+    fun renderProperty(descriptor: PropertyDescriptor): String {
+        fun StringBuilder.appendReceiverType(receiver: ReceiverParameterDescriptor?) {
+            if (receiver != null) {
+                append(renderer.renderType(receiver.getType()))
+                append(".")
+            }
+        }
+
+        return StringBuilder {
+            append(if (descriptor.isVar()) "var " else "val ")
+
+            val dispatchReceiver = descriptor.getDispatchReceiverParameter()
+            val extensionReceiver = descriptor.getExtensionReceiverParameter()
+
+            appendReceiverType(dispatchReceiver)
+
+            val addParentheses = dispatchReceiver != null && extensionReceiver != null
+            if (addParentheses) append("(")
+            appendReceiverType(extensionReceiver)
+            if (addParentheses) append(")")
+
+            append(renderer.renderName(descriptor.getName()))
+        }.toString()
+    }
+}

core/reflection.jvm/src/kotlin/reflect/jvm/internal/moduleByClassLoader.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlin.reflect.jvm.internal
+
+import org.jetbrains.kotlin.load.java.structure.reflect.classLoader
+import org.jetbrains.kotlin.load.kotlin.reflect.RuntimeModuleData
+import java.lang.ref.WeakReference
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.ConcurrentMap
+
+// TODO: collect nulls periodically
+private val moduleByClassLoader: ConcurrentMap<WeakClassLoaderBox, WeakReference<RuntimeModuleData>> = ConcurrentHashMap()
+
+private class WeakClassLoaderBox(classLoader: ClassLoader) {
+    val ref: WeakReference<ClassLoader> = WeakReference(classLoader)
+
+    // Identity hash code is saved because otherwise once the weak reference is GC'd we cannot compute it anymore
+    val identityHashCode: Int = System.identityHashCode(classLoader)
+
+    // Temporary strong reference to the class loader to ensure it won't get GC'd when we're inserting this box into the map
+    var temporaryStrongRef: ClassLoader? = classLoader
+
+    override fun equals(other: Any?) =
+            other is WeakClassLoaderBox && ref.get() === other.ref.get()
+
+    override fun hashCode() =
+            identityHashCode
+}
+
+private fun Class<*>.getOrCreateModule(): RuntimeModuleData {
+    val classLoader = this.classLoader
+    val key = WeakClassLoaderBox(classLoader)
+
+    val cached = moduleByClassLoader[key]
+    if (cached != null) {
+        cached.get()?.let { return it }
+        moduleByClassLoader.remove(key, cached)
+    }
+
+    val module = RuntimeModuleData.create(classLoader)
+    try {
+        while (true) {
+            val ref = moduleByClassLoader.putIfAbsent(key, WeakReference(module))
+            if (ref == null) return module
+
+            val result = ref.get()
+            if (result != null) return result
+            moduleByClassLoader.remove(key, ref)
+        }
+    }
+    finally {
+        key.temporaryStrongRef = null
+    }
+}

core/reflection.jvm/src/kotlin/reflect/jvm/internal/util.kt

@@ -16,7 +16,14 @@
 
 package kotlin.reflect.jvm.internal
 
+import org.jetbrains.kotlin.load.java.structure.reflect.classLoader
+import org.jetbrains.kotlin.load.java.structure.reflect.createArrayType
+import org.jetbrains.kotlin.serialization.deserialization.NameResolver
+import org.jetbrains.kotlin.serialization.jvm.JvmProtoBuf
+import org.jetbrains.kotlin.serialization.jvm.JvmProtoBuf.JvmType.PrimitiveType.*
+import java.lang.reflect.Field
 import java.lang.reflect.Method
+import kotlin.reflect.KotlinReflectionInternalError
 
 private fun String.capitalizeWithJavaBeanConvention(): String {
     if (length() > 1 && Character.isUpperCase(this[1])) return this
@@ -36,3 +43,73 @@ private fun Class<*>.getMaybeDeclaredMethod(name: String, vararg parameterTypes:
         return getDeclaredMethod(name, *parameterTypes)
     }
 }
+
+
+// TODO: check resulting method's return type
+private fun KCallableContainerImpl.findMethodBySignature(signature: JvmProtoBuf.JvmMethodSignature, nameResolver: NameResolver): Method? {
+    val name = nameResolver.getString(signature.getName())
+    val classLoader = jClass.classLoader
+    val parameterTypes = signature.getParameterTypeList().map { jvmType ->
+        loadJvmType(jvmType, nameResolver, classLoader)
+    }.copyToArray()
+    return try {
+        jClass.getMaybeDeclaredMethod(name, *parameterTypes)
+    }
+    catch (e: NoSuchMethodException) {
+        null
+    }
+}
+
+// TODO: check resulting field's type
+private fun KCallableContainerImpl.findFieldBySignature(signature: JvmProtoBuf.JvmFieldSignature, nameResolver: NameResolver): Field? {
+    val name = nameResolver.getString(signature.getName())
+    val owner =
+            if (signature.getIsStaticInOuter())
+                jClass.getEnclosingClass()
+                ?: throw KotlinReflectionInternalError("Inconsistent metadata for field $name in $jClass")
+            else jClass
+
+    return try {
+        owner.getDeclaredField(name)
+    }
+    catch (e: NoSuchFieldException) {
+        null
+    }
+}
+
+
+private val PRIMITIVE_TYPES = mapOf(
+        VOID to Void.TYPE,
+        BOOLEAN to java.lang.Boolean.TYPE,
+        CHAR to java.lang.Character.TYPE,
+        BYTE to java.lang.Byte.TYPE,
+        SHORT to java.lang.Short.TYPE,
+        INT to java.lang.Integer.TYPE,
+        FLOAT to java.lang.Float.TYPE,
+        LONG to java.lang.Long.TYPE,
+        DOUBLE to java.lang.Double.TYPE
+)
+
+private fun loadJvmType(
+        type: JvmProtoBuf.JvmType,
+        nameResolver: NameResolver,
+        classLoader: ClassLoader,
+        arrayDimension: Int = type.getArrayDimension()
+): Class<*> {
+    if (arrayDimension > 0) {
+        // TODO: test multi-dimensional arrays
+        return loadJvmType(type, nameResolver, classLoader, arrayDimension - 1).createArrayType()
+    }
+
+    if (type.hasPrimitiveType()) {
+        return PRIMITIVE_TYPES[type.getPrimitiveType()]
+               ?: throw KotlinReflectionInternalError("Unknown primitive type: ${type.getPrimitiveType()}")
+    }
+
+    if (type.hasClassFqName()) {
+        val fqName = nameResolver.getFqName(type.getClassFqName())
+        return classLoader.loadClass(fqName.asString())
+    }
+
+    throw KotlinReflectionInternalError("Inconsistent metadata for JVM type")
+}