Test void* to jlong implicit type-conversion.

jlong_implement.c

#include <stdio.h>
#include <stdlib.h>

/* define a non-system-specific pointer type that can hold an address of up-to 8-bytes */
typedef long long jlong;

jlong Java_util_getAddress() {
    int* x = malloc(sizeof(int));
    *x = 2312;
    void* address = x;
    return address;
}

int main() {
    int* ptr = ((int*) Java_util_getAddress());
    printf("%lld\n", *((int*) Java_util_getAddress()));
    printf("%lld\n", *((int*) Java_util_getAddress()));
    free(ptr);
    printf("%lld\n", *((int*) Java_util_getAddress()));

    return 0;
}