translator: fix resolve fields without this, fix global vars access

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

@@ -240,7 +240,7 @@ abstract class BlockCodegen(val state: TranslationState, val variableManager: Va
         return result
     }
 
-    fun evaluateMemberMethodOrField(receiver: LLVMVariable, selectorName: String, scopeDepth: Int, call: PsiElement?): LLVMSingleValue? {
+    fun evaluateMemberMethodOrField(receiver: LLVMVariable, selectorName: String, scopeDepth: Int, call: PsiElement? = null): LLVMSingleValue? {
         val type = receiver.type as LLVMReferenceType
         val clazz = resolveClassOrObjectLocation(type)
         val field = clazz.fieldsIndex[selectorName]
@@ -324,23 +324,14 @@ abstract class BlockCodegen(val state: TranslationState, val variableManager: Va
                 indexVariable
             }
         }
-
     }
 
     private fun evaluateReferenceExpression(expr: KtReferenceExpression, scopeDepth: Int, classScope: ClassCodegen? = null): LLVMSingleValue? = when {
         expr is KtArrayAccessExpression -> evaluateArrayAccessExpression(expr, scopeDepth + 1)
         isEnumClassField(expr) -> resolveEnumClassField(expr)
         (expr is KtNameReferenceExpression) && (classScope != null) -> evaluateNameReferenceExpression(expr, classScope)
-        else -> {
-            val referenceContext = state.bindingContext.get(BindingContext.REFERENCE_TARGET, expr)
-            when (referenceContext) {
-                is PropertyDescriptorImpl -> {
-                    val receiverThis = variableManager["this"]!!
-                    evaluateMemberMethodOrField(receiverThis, expr.firstChild.text, topLevel, call = null)!!
-                }
-                else -> variableManager[expr.firstChild.text]
-            }
-        }
+        resolveContainingClass(expr) != null -> evaluateMemberMethodOrField(variableManager["this"]!!, expr.firstChild.text, topLevel)
+        else -> variableManager[expr.firstChild.text]
     }
 
     private fun resolveEnumClassField(expr: KtReferenceExpression): LLVMSingleValue {
@@ -417,7 +408,7 @@ abstract class BlockCodegen(val state: TranslationState, val variableManager: Va
         return null
     }
 
-    private fun resolveContainingClass(expr: KtCallExpression): StructCodegen? {
+    private fun resolveContainingClass(expr: KtElement): StructCodegen? {
         val name = expr.getResolvedCallWithAssert(state.bindingContext).dispatchReceiver?.type?.toString() ?: return null
         return state.classes[name] ?: state.objects[name]
     }

translator/src/test/kotlin/tests/input/classfields_2.txt

@@ -0,0 +1,3 @@
+test1() == 5
+test2() == 0
+test3() == 5

translator/src/test/kotlin/tests/input/global_vars_1.txt

@@ -0,0 +1,2 @@
+global_test1() == 3000
+global_test2() == 4001

translator/src/test/kotlin/tests/kotlin/classfields_2.kt

@@ -0,0 +1,27 @@
+
+class Main {
+    var i = 0
+
+    fun main() {
+        i = 5
+    }
+
+    fun changeI(): Int {
+        main()
+        return i
+    }
+}
+
+fun test1(): Int {
+    val main = Main()
+    return main.changeI()
+}
+
+fun test2(): Int {
+    val main = Main()
+    return main.i
+}
+
+fun test3(): Int {
+    return Main().changeI()
+}

translator/src/test/kotlin/tests/kotlin/global_vars_1.kt

@@ -0,0 +1,11 @@
+
+val MY_FIRST_CONSTANT: Int = 3000
+val MY_SECOND_CONSTANT: Int = 4000
+
+fun global_test1(): Int {
+    return MY_FIRST_CONSTANT
+}
+
+fun global_test2(): Int {
+    return MY_SECOND_CONSTANT + 1
+}