Interop, backend: remove code avoiding zero-length C arrays

Interop/Indexer/src/main/kotlin/org/jetbrains/kotlin/native/interop/indexer/Indexer.kt

@@ -319,7 +319,7 @@ fun buildNativeIndexImpl(headerFile: File, args: List<String>): NativeIndex {
                 indexEntityReference.value = null
             }
 
-            val commandLineArgs = if (args1.size != 0) nativeHeap.allocArrayOfPointersTo(*args1)[0].ptr else null
+            val commandLineArgs = nativeHeap.allocArrayOfPointersTo(*args1)[0].ptr
 
             clang_indexSourceFile(indexAction, clientData, callbacks.ptr, IndexerCallbacks.size.toInt(),
                     0, headerFile.path, commandLineArgs, args1.size, null, 0, null, 0)

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

@@ -123,7 +123,7 @@ internal class CodeGenerator(override val context: Context) : ContextUtils {
                result: String?): LLVMValueRef {
 
         memScoped {
-            val rargs = if (args.size != 0) allocArrayOf(args)[0].ptr else null
+            val rargs = allocArrayOf(args)[0].ptr
             return LLVMBuildInvoke(builder, llvmFunction, rargs, args.size, then, landingpad, result)!!
         }
 
@@ -131,7 +131,7 @@ internal class CodeGenerator(override val context: Context) : ContextUtils {
 
     fun call(llvmFunction: LLVMValueRef?, args: List<LLVMValueRef?>, result: String?): LLVMValueRef {
         memScoped {
-            val rargs = if (args.size != 0) allocArrayOf(args)[0].ptr else null
+            val rargs = allocArrayOf(args)[0].ptr
             return LLVMBuildCall(builder, llvmFunction, rargs, args.size, result)!!
         }
     }

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

@@ -116,7 +116,6 @@ internal fun getLlvmFunctionType(function: FunctionDescriptor): LLVMTypeRef? {
     val paramTypes:List<LLVMTypeRef?> = params.map { getLLVMType(it.type) }
     extraParam += paramTypes
 
-    if (extraParam.size == 0) return LLVMFunctionType(returnType, null, 0, 0)
     memScoped {
         val paramTypesPtr = allocArrayOf(extraParam)[0].ptr
         return LLVMFunctionType(returnType, paramTypesPtr, extraParam.size, 0)
@@ -159,6 +158,6 @@ internal fun ContextUtils.externalGlobal(name: String, type: LLVMTypeRef): LLVMV
 
 internal fun functionType(returnType: LLVMTypeRef?, isVarArg: Boolean = false, vararg paramTypes: LLVMTypeRef?) =
         memScoped {
-            val paramTypesPtr = if (paramTypes.size != 0) allocArrayOf(*paramTypes)[0].ptr else null
+            val paramTypesPtr = allocArrayOf(*paramTypes)[0].ptr
             LLVMFunctionType(returnType, paramTypesPtr, paramTypes.size, if (isVarArg) 1 else 0)!!
         }

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

@@ -64,12 +64,7 @@ internal class RTTIGenerator(override val context: Context) : ContextUtils {
         val fieldTypes = fields.map { getLLVMType(it.returnType!!) }.toTypedArray()
 
         memScoped {
-            val fieldTypesNativeArrayPtr = if (fieldTypes.size > 0) {
+            val fieldTypesNativeArrayPtr = allocArrayOf(*fieldTypes)[0].ptr
-                allocArrayOf(*fieldTypes)[0].ptr
-            } else {
-                null
-            }
-
             LLVMStructSetBody(classType, fieldTypesNativeArrayPtr, fieldTypes.size, 0)
         }
         return classType