translator: fix comparison classes with null

translator/src/main/kotlin/org/kotlinnative/translator/BlockCodegen.kt

@@ -785,8 +785,8 @@ abstract class BlockCodegen(val state: TranslationState, val variableManager: Va
             KtTokens.LTEQ -> firstOp.type!!.operatorLeq(firstNativeOp, secondNativeOp)
             KtTokens.GTEQ -> firstOp.type!!.operatorGeq(firstNativeOp, secondNativeOp)
             KtTokens.EQEQ ->
-                if (firstOp.type is LLVMReferenceType)
+                if (firstOp.type is LLVMReferred)
-                    if (secondOp.type is LLVMReferenceType) {
+                    if (secondOp.type is LLVMReferred) {
                         val firstPointedArgument = receivePointedArgument(firstOp, 1)
                         val secondPointedArgument = receivePointedArgument(secondOp, 1)
                         firstOp.type!!.operatorEq(firstPointedArgument, secondPointedArgument)
@@ -800,8 +800,8 @@ abstract class BlockCodegen(val state: TranslationState, val variableManager: Va
                 firstOp.type!!.operatorEq(firstPointedArgument, secondPointedArgument)
             }
             KtTokens.EXCLEQ -> {
-                if (firstOp.type is LLVMReferenceType)
+                if (firstOp.type is LLVMReferred)
-                    if (secondOp.type is LLVMReferenceType) {
+                    if (secondOp.type is LLVMReferred) {
                         val firstPointedArgument = receivePointedArgument(firstOp, 1)
                         val secondPointedArgument = receivePointedArgument(secondOp, 1)
                         firstOp.type!!.operatorNeq(firstPointedArgument, secondPointedArgument)

translator/src/main/kotlin/org/kotlinnative/translator/llvm/types/LLVMNullType.kt

@@ -1,13 +1,16 @@
 package org.kotlinnative.translator.llvm.types
 
-class LLVMNullType() : LLVMType() {
+import org.kotlinnative.translator.llvm.LLVMExpression
-    override val align: Int = 0
+import org.kotlinnative.translator.llvm.LLVMSingleValue
+
+class LLVMNullType(var basetype: LLVMType? = null) : LLVMReferred, LLVMType() {
+    override val align: Int = 1
     override var size: Int = 0
-    override val defaultValue: String = "0"
+    override val defaultValue: String = "null"
 
     override fun mangle() = ""
 
-    override val typename = ""
+    override val typename = basetype?.typename ?: ""
 
     override fun equals(other: Any?): Boolean {
         return other is LLVMNullType

translator/src/main/kotlin/org/kotlinnative/translator/llvm/types/LLVMReferenceType.kt

@@ -4,9 +4,9 @@ import org.kotlinnative.translator.llvm.LLVMExpression
 import org.kotlinnative.translator.llvm.LLVMSingleValue
 import java.util.*
 
-class LLVMReferenceType(val type: String, var prefix: String = "", override var align: Int = 4, override var size: Int = 4, var byRef: Boolean = true) : LLVMType() {
+class LLVMReferenceType(val type: String, var prefix: String = "", override var align: Int = 4, override var size: Int = 4, var byRef: Boolean = true) : LLVMReferred, LLVMType() {
 
-    override val defaultValue: String = ""
+    override val defaultValue: String = "null"
 
     override val typename: String
         get() = "$prefix${if (prefix.length > 0) "." else ""}${

translator/src/main/kotlin/org/kotlinnative/translator/llvm/types/LLVMReferred.kt

@@ -0,0 +1,4 @@
+package org.kotlinnative.translator.llvm.types
+
+interface LLVMReferred {
+}