backend: improve typealias support:

* handle TypeAliasConstructorDescriptor in codegen
* ignore ignore typealias declaration in codegen

Also add test 'typealias1'.

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

@@ -11,6 +11,7 @@ import org.jetbrains.kotlin.backend.konan.descriptors.vtableSize
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.impl.TypeAliasConstructorDescriptor
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrField
 import org.jetbrains.kotlin.ir.declarations.IrProperty
@@ -102,6 +103,9 @@ internal interface ContextUtils {
     val FunctionDescriptor.llvmFunction: LLVMValueRef
         get() {
             assert (this.kind.isReal)
+            if (this is TypeAliasConstructorDescriptor) {
+                return this.underlyingConstructorDescriptor.llvmFunction
+            }
             val globalName = this.symbolName
             val module = context.llvmModule
 

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

@@ -587,6 +587,12 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
 
     //-------------------------------------------------------------------------//
 
+    override fun visitTypeAlias(declaration: IrTypeAlias) {
+        // Nothing to do.
+    }
+
+    //-------------------------------------------------------------------------//
+
     override fun visitProperty(declaration: IrProperty) {
         declaration.acceptChildrenVoid(this)
     }
@@ -1663,7 +1669,7 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
 
         when (descriptor) {
             is IrBuiltinOperatorDescriptorBase -> return evaluateOperatorCall      (callee, args)
-            is ClassConstructorDescriptor      -> return evaluateConstructorCall   (callee, args)
+            is ConstructorDescriptor           -> return evaluateConstructorCall   (callee, args)
             else                               -> return evaluateSimpleFunctionCall(descriptor, args)
         }
     }
@@ -1728,10 +1734,10 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
     private fun evaluateConstructorCall(callee: IrCall, args: List<LLVMValueRef>): LLVMValueRef {
         context.log("evaluateConstructorCall    : ${ir2string(callee)}")
         memScoped {
-            val containingClass = (callee.descriptor as ClassConstructorDescriptor).containingDeclaration
-            val typeInfo = codegen.typeInfoValue(containingClass)
+            val constructedClass = (callee.descriptor as ConstructorDescriptor).constructedClass
+            val typeInfo = codegen.typeInfoValue(constructedClass)
             val allocHint = Int32(1).llvm
-            val thisValue = if (containingClass.isArray) {
+            val thisValue = if (constructedClass.isArray) {
                 assert(args.size >= 1 && args[0].type == int32Type)
                 val allocArrayInstanceArgs = listOf(typeInfo, allocHint, args[0])
                 call(context.llvm.allocArrayFunction, allocArrayInstanceArgs)

backend.native/tests/build.gradle

@@ -143,6 +143,11 @@ task safe_cast(type: RunKonanTest) {
     source = "codegen/basics/safe_cast.kt"
 }
 
+task typealias1(type: RunKonanTest) {
+    goldValue = "42\n"
+    source = "codegen/basics/typealias1.kt"
+}
+
 task aritmetic(type: RunKonanTest) {
     source = "codegen/function/arithmetic.kt"
 }

backend.native/tests/codegen/basics/typealias1.kt

@@ -0,0 +1,6 @@
+fun main(args: Array<String>) {
+    println(Bar(42).x)
+}
+
+class Foo(val x: Int)
+typealias Bar = Foo