backend.native: support inheritance in RTTI

also
* distribute the code among several files
* use descriptors instead of IR (where it is possible)
* add other minor improvements

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/DescriptorUtils.kt

@@ -0,0 +1,36 @@
+package org.jetbrains.kotlin.backend.native
+
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.resolve.OverridingUtil
+import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
+import org.jetbrains.kotlin.resolve.descriptorUtil.classId
+import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassNotAny
+import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperInterfaces
+
+/**
+ * List of all implemented interfaces (including those which implemented by a super class)
+ */
+internal val ClassDescriptor.implementedInterfaces: List<ClassDescriptor>
+    get() {
+        val superClassImplementedInterfaces = this.getSuperClassNotAny()?.implementedInterfaces ?: emptyList()
+        return (superClassImplementedInterfaces + this.getSuperInterfaces()).distinctBy { it.classId }
+    }
+
+
+/**
+ * Implementation of given method.
+ *
+ * TODO: this method is actually a part of resolve and probably duplicates another one
+ */
+internal val FunctionDescriptor.implementation: FunctionDescriptor
+    get() {
+        if (this.kind.isReal) {
+            return this
+        } else {
+            val overridden = OverridingUtil.getOverriddenDeclarations(this)
+            val filtered = OverridingUtil.filterOutOverridden(overridden)
+            return filtered.first { it.modality != Modality.ABSTRACT } as FunctionDescriptor
+        }
+    }

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/ModuleIndex.kt

@@ -0,0 +1,37 @@
+package org.jetbrains.kotlin.backend.native
+
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
+import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
+import org.jetbrains.kotlin.ir.visitors.acceptVoid
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.resolve.descriptorUtil.classId
+
+class ModuleIndex(val module: IrModuleFragment) {
+
+    /**
+     * Contains all classes declared in [module]
+     */
+    val classes: Map<ClassId, IrClass>
+
+    init {
+        val map = mutableMapOf<ClassId, IrClass>()
+
+        module.acceptVoid(object : IrElementVisitorVoid {
+            override fun visitElement(element: IrElement) {
+                element.acceptChildrenVoid(this)
+            }
+
+            override fun visitClass(declaration: IrClass) {
+                super.visitClass(declaration)
+
+                map[declaration.descriptor.classId] = declaration
+            }
+
+        })
+
+        classes = map
+    }
+}

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/Context.kt

@@ -0,0 +1,17 @@
+package org.jetbrains.kotlin.backend.native.llvm
+
+import llvm.LLVMCreateBuilder
+import llvm.LLVMDisposeBuilder
+import llvm.LLVMOpaqueModule
+import org.jetbrains.kotlin.backend.native.ModuleIndex
+import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+
+internal class Context(val irModule: IrModuleFragment, val runtime: Runtime, val llvmModule: LLVMOpaqueModule) {
+    val moduleIndex = ModuleIndex(irModule)
+
+    val llvmBuilder = LLVMCreateBuilder()
+
+    fun dispose() {
+        LLVMDisposeBuilder(llvmBuilder)
+    }
+}

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/ContextUtils.kt

@@ -0,0 +1,113 @@
+package org.jetbrains.kotlin.backend.native.llvm
+
+import kotlin_native.interop.mallocNativeArrayOf
+import llvm.*
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.ir.declarations.IrProperty
+import org.jetbrains.kotlin.resolve.descriptorUtil.classId
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
+import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassNotAny
+
+/**
+ * Provides utility methods to the implementer.
+ */
+internal interface ContextUtils {
+    val context: Context
+
+    /**
+     * All fields of the class instance.
+     * The order respects the class hierarchy, i.e. a class [fields] contains superclass [fields] as a prefix.
+     */
+    val ClassDescriptor.fields: List<PropertyDescriptor>
+        get() {
+            val superClass = this.getSuperClassNotAny() // TODO: what if Any has fields?
+            val superFields = if (superClass != null) superClass.fields else emptyList()
+
+            return superFields + this.declaredFields
+        }
+
+    /**
+     * Fields declared in the class.
+     */
+    val ClassDescriptor.declaredFields: List<PropertyDescriptor>
+        get() {
+            // TODO: do not use IR to get fields
+            val irClass = context.moduleIndex.classes[this.classId] ?:
+                          throw IllegalArgumentException("Class ${this.fqNameSafe} is not found in current module")
+
+            return irClass.declarations.mapNotNull { (it as? IrProperty)?.backingField?.descriptor }
+        }
+
+    /**
+     * LLVM function generated from the Kotlin function.
+     * It may be declared as external function prototype.
+     */
+    val FunctionDescriptor.llvmFunction: CompileTimeValue
+        get() {
+            assert (this.kind.isReal)
+            val globalName = this.symbolName
+            val module = context.llvmModule
+            val functionType = LLVMFunctionType(LLVMVoidType(), null, 0, 0) // FIXME: use correct types
+            val function = LLVMGetNamedFunction(module, globalName) ?: LLVMAddFunction(module, globalName, functionType)
+            return compileTimeValue(function)
+        }
+
+    /**
+     * Address of entry point of [llvmFunction].
+     */
+    val FunctionDescriptor.entryPointAddress: CompileTimeValue
+        get() {
+            val result = LLVMConstBitCast(this.llvmFunction.getLlvmValue(), pointerType(LLVMInt8Type()))
+            return compileTimeValue(result)
+        }
+
+    /**
+     * Pointer to type info for given class.
+     * It may be declared as pointer to external variable.
+     */
+    val ClassDescriptor.llvmTypeInfoPtr: CompileTimeValue
+        get() {
+            val module = context.llvmModule
+            val globalName = this.typeInfoSymbolName
+            val globalPtr = LLVMGetNamedGlobal(module, globalName) ?:
+                            LLVMAddGlobal(module, context.runtime.typeInfoType, globalName)
+
+            return compileTimeValue(globalPtr)
+        }
+
+    /**
+     * Adds global variable with given name and value to [Context.llvmModule] of [context].
+     * Returns pointer to this variable.
+     */
+    fun addGlobalVar(name: String, value: CompileTimeValue): CompileTimeValue {
+        val global = LLVMAddGlobal(context.llvmModule, value.getLlvmType(), name)
+        LLVMSetInitializer(global, value.getLlvmValue())
+        return compileTimeValue(global)
+    }
+
+    /**
+     * Returns pointer to first element of given array.
+     *
+     * @param arrayPtr pointer to array
+     */
+    private fun getPtrToFirstElem(arrayPtr: CompileTimeValue): CompileTimeValue {
+        val indices = longArrayOf(0, 0).map { LLVMConstInt(LLVMInt32Type(), it, 0) }.toTypedArray()
+        val indicesNativeArrayPtr = mallocNativeArrayOf(LLVMOpaqueValue, *indices)[0] // TODO: dispose
+
+        return compileTimeValue(LLVMBuildGEP(context.llvmBuilder, arrayPtr.getLlvmValue(), indicesNativeArrayPtr, indices.size, ""))
+    }
+
+    /**
+     * Adds global array-typed variable with given name and value to [Context.llvmModule] of [context].
+     * Returns pointer to the first element of the global array.
+     */
+    fun addGlobalArray(name: String, elemType: LLVMOpaqueType?, elements: List<CompileTimeValue>): CompileTimeValue {
+        return if (elements.size > 0) {
+            getPtrToFirstElem(addGlobalVar(name, ConstArray(elemType, elements)))
+        } else {
+            Zero(pointerType(elemType))
+        }
+    }
+}

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/DataLayout.kt

@@ -0,0 +1,16 @@
+package org.jetbrains.kotlin.backend.native.llvm
+
+import llvm.*
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.types.KotlinType
+
+internal fun getLLVMType(type: KotlinType): LLVMOpaqueType {
+    return when {
+        KotlinBuiltIns.isBoolean(type) || KotlinBuiltIns.isByte(type) -> LLVMInt8Type()
+        KotlinBuiltIns.isShort(type) || KotlinBuiltIns.isChar(type) -> LLVMInt16Type()
+        KotlinBuiltIns.isInt(type) -> LLVMInt32Type()
+        KotlinBuiltIns.isLong(type) -> LLVMInt64Type()
+        !KotlinBuiltIns.isPrimitiveType(type) -> LLVMPointerType(LLVMInt8Type(), 0)
+        else -> throw NotImplementedError()
+    }!!
+}

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/IrToBitcode.kt

@@ -1,13 +1,34 @@
 package org.jetbrains.kotlin.backend.native.llvm
 
 import llvm.*
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
+import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 
 fun emitLLVM(module: IrModuleFragment, runtimeFile: String, outFile: String) {
-    val llvmModule = LLVMModuleCreateWithName("out")!!
-    val runtime = Runtime(runtimeFile)
+    val llvmModule = LLVMModuleCreateWithName("out")!! // TODO: dispose
+    val runtime = Runtime(runtimeFile) // TODO: dispose
     LLVMSetDataLayout(llvmModule, runtime.dataLayout)
     LLVMSetTarget(llvmModule, runtime.target)
-    module.accept(RTTIGenerator(llvmModule, runtime), null)
+
+    val context = Context(module, runtime, llvmModule) // TODO: dispose
+
+    module.accept(RTTIGeneratorVisitor(context), null)
     LLVMWriteBitcodeToFile(llvmModule, outFile)
+}
+
+internal class RTTIGeneratorVisitor(context: Context) : IrElementVisitorVoid {
+    val generator = RTTIGenerator(context)
+
+    override fun visitElement(element: IrElement) {
+        element.acceptChildrenVoid(this)
+    }
+
+    override fun visitClass(declaration: IrClass) {
+        super.visitClass(declaration)
+        generator.generate(declaration.descriptor)
+    }
+
 }

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/LlvmUtils.kt

@@ -0,0 +1,58 @@
+package org.jetbrains.kotlin.backend.native.llvm
+
+import kotlin_native.interop.mallocNativeArrayOf
+import llvm.*
+
+/**
+ * Represents the value which can be emitted as bitcode const value
+ */
+internal abstract class CompileTimeValue {
+
+    abstract fun getLlvmValue(): LLVMOpaqueValue?
+
+    fun getLlvmType(): LLVMOpaqueType? {
+        return LLVMTypeOf(getLlvmValue())
+    }
+
+}
+
+internal class ConstArray(val elemType: LLVMOpaqueType?, val elements: List<CompileTimeValue>) : CompileTimeValue() {
+
+    override fun getLlvmValue(): LLVMOpaqueValue? {
+        val values = elements.map { it.getLlvmValue() }.toTypedArray()
+        val valuesNativeArrayPtr = mallocNativeArrayOf(LLVMOpaqueValue, *values)[0] // FIXME: dispose
+
+        return LLVMConstArray(elemType, valuesNativeArrayPtr, values.size)
+    }
+}
+
+internal open class Struct(val type: LLVMOpaqueType?, val elements: List<CompileTimeValue>) : CompileTimeValue() {
+
+    constructor(type: LLVMOpaqueType?, vararg elements: CompileTimeValue) : this(type, elements.toList())
+
+    override fun getLlvmValue(): LLVMOpaqueValue? {
+        val values = elements.map { it.getLlvmValue() }.toTypedArray()
+        val valuesNativeArrayPtr = mallocNativeArrayOf(LLVMOpaqueValue, *values)[0] // FIXME: dispose
+        return LLVMConstNamedStruct(type, valuesNativeArrayPtr, values.size)
+    }
+}
+
+internal class Int32(val value: Int) : CompileTimeValue() {
+    override fun getLlvmValue() = LLVMConstInt(LLVMInt32Type(), value.toLong(), 1)
+}
+
+internal class Int64(val value: Long) : CompileTimeValue() {
+    override fun getLlvmValue() = LLVMConstInt(LLVMInt64Type(), value, 1)
+}
+
+internal class Zero(val type: LLVMOpaqueType?) : CompileTimeValue() {
+    override fun getLlvmValue() = LLVMConstNull(type)
+}
+
+internal fun compileTimeValue(value: LLVMOpaqueValue?) = object : CompileTimeValue() {
+    override fun getLlvmValue() = value
+}
+
+internal val int32Type = LLVMInt32Type()
+
+internal fun pointerType(pointeeType: LLVMOpaqueType?) = LLVMPointerType(pointeeType, 0)

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/NameUtils.kt

@@ -0,0 +1,29 @@
+package org.jetbrains.kotlin.backend.native.llvm
+
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
+import java.util.zip.CRC32
+
+private fun crc32(str: String): Long {
+    val c = CRC32()
+    c.update(str.toByteArray())
+    return c.value
+}
+
+internal val String.nameHash: Long
+    get() = crc32(this)
+
+internal val Name.nameHash: Long
+    get() = this.toString().nameHash
+
+internal val FqName.nameHash: Long
+    get() = this.toString().nameHash
+
+internal val FunctionDescriptor.symbolName: String
+    get() = "kfun:" + this.fqNameSafe.toString() // FIXME: add signature
+
+internal val ClassDescriptor.typeInfoSymbolName: String
+    get() = "ktype:" + this.fqNameSafe.toString()

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/RTTIGenerator.kt

@@ -1,101 +1,23 @@
 package org.jetbrains.kotlin.backend.native.llvm
 
 
-import kotlin_native.interop.*
+import kotlin_native.interop.mallocNativeArrayOf
 import llvm.*
+import org.jetbrains.kotlin.backend.native.implementation
+import org.jetbrains.kotlin.backend.native.implementedInterfaces
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
-import org.jetbrains.kotlin.ir.IrElement
-import org.jetbrains.kotlin.ir.declarations.IrClass
-import org.jetbrains.kotlin.ir.declarations.IrField
-import org.jetbrains.kotlin.ir.declarations.IrFunction
-import org.jetbrains.kotlin.ir.declarations.IrProperty
-import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassOrAny
-import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperInterfaces
-import java.util.zip.CRC32
 
-private fun crc32(str: String): Long {
-    val c = CRC32()
-    c.update(str.toByteArray())
-    return c.value
-}
 
-private fun crc32(name: Name) = crc32(name.toString())
+internal class RTTIGenerator(override val context: Context) : ContextUtils {
 
-private fun getKotlinType(field: IrField) = field.descriptor.returnType!!
-
-private fun getLLVMType(field: IrField): LLVMOpaqueType {
-    val type = getKotlinType(field)
-    return when {
-        KotlinBuiltIns.isBoolean(type) || KotlinBuiltIns.isByte(type) -> LLVMInt8Type()
-        KotlinBuiltIns.isShort(type) || KotlinBuiltIns.isChar(type) -> LLVMInt16Type()
-        KotlinBuiltIns.isInt(type) -> LLVMInt32Type()
-        KotlinBuiltIns.isLong(type) -> LLVMInt64Type()
-        !KotlinBuiltIns.isPrimitiveType(type) -> LLVMPointerType(LLVMInt8Type(), 0)
-        else -> throw NotImplementedError()
-    }!!
-}
-
-class RTTIGenerator(val module: LLVMOpaqueModule, val runtime: Runtime): IrElementVisitorVoid {
-
-    /**
-     * Represents the value which can be emitted as bitcode const value
-     */
-    private inner abstract class CompileTimeValue {
-
-        abstract fun getLlvmValue(): LLVMOpaqueValue?
-
-        fun getLlvmType(): LLVMOpaqueType? {
-            return LLVMTypeOf(getLlvmValue())
-        }
-
-    }
-
-    private inner class ConstArray(val elemType: LLVMOpaqueType?, val elements: List<CompileTimeValue>) : CompileTimeValue() {
-
-        override fun getLlvmValue(): LLVMOpaqueValue? {
-            val values = elements.map { it.getLlvmValue() }.toTypedArray()
-            val valuesNativeArrayPtr = arena.allocNativeArrayOf(LLVMOpaqueValue, *values)[0]
-
-            return LLVMConstArray(elemType, valuesNativeArrayPtr, values.size)
-        }
-    }
-
-    private inner open class Struct(val type: LLVMOpaqueType?, val elements: List<CompileTimeValue>) : CompileTimeValue() {
-
-        constructor(type: LLVMOpaqueType?, vararg elements: CompileTimeValue) : this(type, elements.toList())
-
-        override fun getLlvmValue(): LLVMOpaqueValue? {
-            val values = elements.map { it.getLlvmValue() }.toTypedArray()
-            val valuesNativeArrayPtr = arena.allocNativeArrayOf(LLVMOpaqueValue, *values)[0]
-            return LLVMConstNamedStruct(type, valuesNativeArrayPtr, values.size)
-        }
-    }
-
-    private inner class Int32(val value: Int) : CompileTimeValue() {
-        override fun getLlvmValue() = LLVMConstInt(LLVMInt32Type(), value.toLong(), 1)
-    }
-
-    private inner class Int64(val value: Long) : CompileTimeValue() {
-        override fun getLlvmValue() = LLVMConstInt(LLVMInt64Type(), value, 1)
-    }
-
-    private inner class Zero(val type: LLVMOpaqueType?) : CompileTimeValue() {
-        override fun getLlvmValue() = LLVMConstNull(type)
-    }
-
-    private fun compileTimeValue(value: LLVMOpaqueValue?) = object : CompileTimeValue() {
-        override fun getLlvmValue() = value
-    }
-
-    private val int32Type = LLVMInt32Type()
-
-    private fun pointer(type: LLVMOpaqueType?) = LLVMPointerType(type, 0) // TODO: why 0?
+    val runtime: Runtime
+        get() = context.runtime
 
 
     private inner class FieldTableRecord(val nameSignature: Long, val fieldOffset: Int) :
@@ -135,83 +57,50 @@ class RTTIGenerator(val module: LLVMOpaqueModule, val runtime: Runtime): IrEleme
                     Int32(fieldsCount)
             )
 
-    private val builder = LLVMCreateBuilder() // TODO: dispose
-    private val arena = Arena() // TODO: dispose
-
-    private fun addGlobalConst(name: String, value: CompileTimeValue): CompileTimeValue {
-        val global = LLVMAddGlobal(module, value.getLlvmType(), name)
-        LLVMSetInitializer(global, value.getLlvmValue())
-        return compileTimeValue(global)
-    }
-
-    private fun getPtrToFirstElem(arrayPtr: CompileTimeValue): CompileTimeValue {
-        val indices = longArrayOf(0, 0).map { LLVMConstInt(LLVMInt32Type(), it, 0) }.toTypedArray()
-        val indicesNativeArrayPtr = arena.allocNativeArrayOf(LLVMOpaqueValue, *indices)[0]
-
-        return compileTimeValue(LLVMBuildGEP(builder, arrayPtr.getLlvmValue(), indicesNativeArrayPtr, indices.size, ""))
-    }
-
-    private fun addGlobalArray(name: String, elemType: LLVMOpaqueType?, elements: List<CompileTimeValue>): CompileTimeValue {
-        return if (elements.size > 0) {
-            getPtrToFirstElem(addGlobalConst(name, ConstArray(elemType, elements)))
+    // TODO: probably it should be moved out of this class and shared.
+    private fun createStructFor(className: FqName, fields: List<PropertyDescriptor>): LLVMOpaqueType? {
+        val classType = LLVMStructCreateNamed(LLVMGetModuleContext(context.llvmModule), "kclass:" + className)
+        val fieldTypes = fields.map { getLLVMType(it.returnType!!) }.toTypedArray()
+        val fieldTypesNativeArrayPtr = if (fieldTypes.size > 0) {
+            mallocNativeArrayOf(LLVMOpaqueType, *fieldTypes)[0] // TODO: dispose
         } else {
-            Zero(pointer(elemType))
+            null
         }
-    }
 
-    private fun typeInfoFor(classDesc: ClassDescriptor): LLVMOpaqueValue? {
-        val globalName = "ktype:" + classDesc.fqNameSafe.toString()
-        return LLVMGetNamedGlobal(module, globalName) ?: LLVMAddGlobal(module, runtime.typeInfoType, globalName)
-    }
-
-    private fun createStructFor(className: FqName, declaredFields: List<IrField>): LLVMOpaqueType? {
-        val fieldTypes = declaredFields.map { getLLVMType(it) }.toTypedArray()
-        val classType = LLVMStructCreateNamed(LLVMGetModuleContext(module), "kclass:" + className)
-        val fieldTypesNativeArray = mallocNativeArrayOf(LLVMOpaqueType, *fieldTypes)
-        LLVMStructSetBody(classType, fieldTypesNativeArray[0], fieldTypes.size, 0)
+        LLVMStructSetBody(classType, fieldTypesNativeArrayPtr, fieldTypes.size, 0)
         return classType
     }
 
-    private fun methodEntryPoint(function: FunctionDescriptor): CompileTimeValue {
-        val globalName = "kfun:" + function.fqNameSafe.toString() // FIXME: add signature
-        val functionType = LLVMFunctionType(LLVMVoidType(), null, 0, 0) // FIXME: use correct types
-        val function = LLVMGetNamedFunction(module, globalName) ?: LLVMAddFunction(module, globalName, functionType)
-        val result = compileTimeValue(LLVMConstBitCast(function, pointer(LLVMInt8Type())))
-        return result
+    private fun getMethodTableEntries(classDesc: ClassDescriptor): List<FunctionDescriptor> {
+        val contributedDescriptors = classDesc.unsubstitutedMemberScope.getContributedDescriptors()
+         // (includes declarations from supers)
+
+        val methods = contributedDescriptors.filterIsInstance<FunctionDescriptor>()
+
+        val properties = contributedDescriptors.filterIsInstance<PropertyDescriptor>()
+        val getters = properties.mapNotNull { it.getter }
+        val setters = properties.mapNotNull { it.setter }
+
+        return methods + getters + setters
     }
 
-    private fun getDeclaredFields(irClass: IrClass) = irClass.declarations.mapNotNull { (it as? IrProperty)?.backingField }
+    fun generate(classDesc: ClassDescriptor) {
 
-    private fun getDeclaredMethods(irClass: IrClass): List<IrFunction> {
-        val functions = irClass.declarations.filterIsInstance<IrFunction>()
-        val properties = irClass.declarations.filterIsInstance<IrProperty>()
-        return functions + properties.mapNotNull { it.getter } + properties.mapNotNull { it.setter }
-    }
+        val className = classDesc.fqNameSafe
 
-    override fun visitElement(element: IrElement) {
-        element.acceptChildren(this, null)
-    }
+        val classType = createStructFor(className, classDesc.fields)
 
-    override fun visitClass(declaration: IrClass) {
-        visitElement(declaration)
-
-        val className = declaration.descriptor.fqNameSafe
-
-        val declaredFields = getDeclaredFields(declaration)
-
-        val classType = createStructFor(className, declaredFields)
-
-        val name = crc32(className.toString())
+        val name = className.nameHash
 
         val size = LLVMStoreSizeOfType(runtime.targetData, classType).toInt()
 
-        val superType = compileTimeValue(typeInfoFor(declaration.descriptor.getSuperClassOrAny()))
+        val superType = classDesc.getSuperClassOrAny().llvmTypeInfoPtr
 
-        val interfaces = declaration.descriptor.getSuperInterfaces().map { compileTimeValue(typeInfoFor(it)) }
-        val interfacesPtr = addGlobalArray("kintf:$className", pointer(runtime.typeInfoType), interfaces)
+        val interfaces = classDesc.implementedInterfaces.map { it.llvmTypeInfoPtr }
+        val interfacesPtr = addGlobalArray("kintf:$className", pointerType(runtime.typeInfoType), interfaces)
 
-        val refFieldIndices = declaredFields.mapIndexedNotNull { index, field ->
-            val type = getKotlinType(field)
+        val refFieldIndices = classDesc.fields.mapIndexedNotNull { index, field ->
+            val type = field.returnType!!
             if (!KotlinBuiltIns.isPrimitiveType(type)) {
                 index
             } else {
@@ -222,19 +111,19 @@ class RTTIGenerator(val module: LLVMOpaqueModule, val runtime: Runtime): IrEleme
         val objOffsets = refFieldIndices.map { LLVMOffsetOfElement(runtime.targetData, classType, it) }
         val objOffsetsPtr = addGlobalArray("krefs:$className", int32Type, objOffsets.map { Int32(it.toInt()) })
 
-        // TODO: add fields from supers
-        val fields = declaredFields.mapIndexed { index, field ->
-            val nameSignature = crc32(field.descriptor.name) // FIXME: add signature
+        val fields = classDesc.fields.mapIndexed { index, field ->
+            // Note: using FQ name because a class may have multiple fields with the same name due to property overriding
+            val nameSignature = field.fqNameSafe.nameHash // FIXME: add signature
             val fieldOffset = LLVMOffsetOfElement(runtime.targetData, classType, index)
             FieldTableRecord(nameSignature, fieldOffset.toInt())
         }.sortedBy { it.nameSignature }
 
         val fieldsPtr = addGlobalArray("kfields:$className", runtime.fieldTableRecordType, fields)
 
-        // TODO: add methods from supers
-        val methods = getDeclaredMethods(declaration).map {
-            val nameSignature = crc32(it.descriptor.name) // FIXME: add signature
-            val methodEntryPoint = methodEntryPoint(it.descriptor)
+        val methods = getMethodTableEntries(classDesc).map {
+            val nameSignature = it.name.nameHash // FIXME: add signature
+            // TODO: compile-time resolution limits binary compatibility
+            val methodEntryPoint = it.implementation.entryPointAddress
             MethodTableRecord(nameSignature, methodEntryPoint)
         }.sortedBy { it.nameSignature }
 
@@ -247,7 +136,7 @@ class RTTIGenerator(val module: LLVMOpaqueModule, val runtime: Runtime): IrEleme
                                 methodsPtr, methods.size,
                                 fieldsPtr, fields.size)
 
-        val typeInfoGlobal = typeInfoFor(declaration.descriptor)
+        val typeInfoGlobal = classDesc.llvmTypeInfoPtr.getLlvmValue() // TODO: it is a hack
         LLVMSetInitializer(typeInfoGlobal, typeInfo.getLlvmValue())
     }