--- /dev/null	2020-02-03 17:34:35.000000000 +0530
+++ new/test/jdk/tools/jextract/testStruct/libStruct.c	2020-02-03 17:34:35.000000000 +0530
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "struct.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+EXPORT char* LastCalledMethod;
+
+struct UndefinedStruct {
+    int x;
+    int y;
+};
+
+struct UndefinedStructForPointer {
+    UndefinedStruct position;
+    UndefinedStructPointer parent;
+    UndefinedStructPointer firstChild;
+    struct UndefinedStructForPointer *left;
+    UndefinedStructPointer right;
+    struct Opaque *data;
+};
+
+struct Opaque {
+    int size;
+    char *data;
+};
+
+EXPORT UndefinedStruct* allocateUndefinedStruct() {
+    UndefinedStruct *p = malloc(sizeof(UndefinedStruct));
+    p->x = 0x1234;
+    p->y = 0x3412;
+    return p;
+}
+
+EXPORT struct Plain fromUndefinedStruct(UndefinedStruct *p) {
+    return *((struct Plain*) p);
+}
+
+// intentionally mismatch prototype with same type
+EXPORT UndefinedStructPointer getParent(struct UndefinedStructForPointer * node) {
+    return node->parent;
+}
+
+// intentionally mismatch prototype with same type
+EXPORT UndefinedStructPointer getSibling(UndefinedStructPointer node) {
+    return node->right;
+}
+
+EXPORT UndefinedStructPointer getFirstChild(struct UndefinedStructForPointer *node) {
+    return node->firstChild;
+}
+
+EXPORT struct Opaque* allocate_opaque_struct() {
+    return (struct Opaque*) malloc(sizeof(struct Opaque));
+}
+
+EXPORT TypedefAnonymous getAnonymous(TypedefNamedDifferent_t fns, int x, int y) {
+    TypedefAnonymous s;
+    s.x = x;
+    s.y = y;
+    s.l = fns.fn(x, y);
+
+    return s;
+}
+
+EXPORT void emptyArguments() {
+    LastCalledMethod = "emptyArguments";
+    printf("%s\n", LastCalledMethod);
+}
+
+EXPORT void voidArguments(void) {
+    LastCalledMethod = "voidArguments";
+    printf("%s\n", LastCalledMethod);
+}
+
+EXPORT void* FunctionWithVoidPointer(void *data, void **array_data) {
+    return NULL;
+}