refcount/test/test_refcount.c

#include "alloc.h"

#include <assert.h>
#include <refcount/refcount.h>

typedef struct A {
    int num;
    RefcountEntry refcount;
    char *str;
    struct A *next;
} A;

A *make_a(RefcountContext *c, int n, const char *s) {
    A *a = counting_malloc(sizeof(A));
    a->num = n;
    a->str = counting_strdup(s);
    a->next = NULL;
    refcount_context_init_obj(c, a);
    return a;
}

bool held_refs_callback(void *a_raw, RefcountList **out, void *ignored) {
    A *a = a_raw;
    *out = refcount_list_push_full(*out, a->next, &COUNTING_ALLOCATOR);
    return true;
}

void destroy_callback(void *a_raw, void *ignored) {
    A *a = a_raw;
    counting_free(a->str);
    counting_free(a);
}

int main(int argc, const char **argv) {
    RefcountContext *c =
        refcount_make_context(offsetof(A, refcount), held_refs_callback,
                              destroy_callback, NULL, &COUNTING_ALLOCATOR);

    A *a = make_a(c, 10, "Hello world\n");
    assert(!refcount_context_is_static(c, a));
    assert(refcount_context_num_refs(c, a) == 0);

    a = refcount_context_ref(c, a);
    assert(refcount_context_num_refs(c, a) == 1);

    a = refcount_context_ref(c, a);
    assert(refcount_context_num_refs(c, a) == 2);

    a = refcount_context_unref(c, a);
    assert(refcount_context_num_refs(c, a) == 1);

    a = refcount_context_float(c, a);
    assert(a);
    assert(refcount_context_num_refs(c, a) == 0);

    refcount_context_ref(c, a);
    assert(refcount_context_num_refs(c, a) == 1);

    a = refcount_context_unref(c, a);
    assert(!a);

    a = make_a(c, 10, "Hello World\n");
    A *b = make_a(c, 42, "The answer!");
    a->next = refcount_context_ref(c, b);
    assert(refcount_context_num_refs(c, a->next) == 1);
    assert(refcount_context_num_refs(c, a) == 0);

    refcount_context_unref(c, a);

    a = make_a(c, 'a', "a");
    a->next = refcount_context_ref(c, a);
    assert(refcount_context_num_refs(c, a) == 1);

    refcount_context_unref(c, a);

    a = NULL;
    for (char i = 'a'; i <= 'z'; ++i) {
        A *na = make_a(c, i, "");
        na->next = refcount_context_ref(c, a);
        a = na;
    }
    assert(refcount_context_num_refs(c, a) == 0);

    refcount_context_unref(c, a);

    A *first = NULL;
    a = NULL;
    for (char i = 'a'; i <= 'z'; ++i) {
        A *na = make_a(c, i, "");
        if (!first) {
            first = na;
        }
        na->next = refcount_context_ref(c, a);
        a = na;
    }
    assert(refcount_context_num_refs(c, a) == 0);
    first->next = refcount_context_ref(c, a);
    a = first;
    assert(refcount_context_num_refs(c, a) == 1);

    refcount_context_ref(c, a);
    refcount_context_unref(c, a);
    assert(refcount_context_num_refs(c, a) == 1);

    a = NULL;
    for (char i = 'a'; i <= 'z'; ++i) {
        A *na = make_a(c, i, "");
        na->next = refcount_context_ref(c, a);
        a = na;
    }
    assert(refcount_context_num_refs(c, a) == 0);
    refcount_context_unref(c, a);

    assert(refcount_context_garbage_collect(c) == 26);

    a = make_a(c, 0, "a");

    RefcountWeakref *w = refcount_context_make_weakref(c, a);
    assert(w);
    assert(refcount_context_num_refs(c, a) == 0);

    b = refcount_context_strengthen(c, w);
    assert(b);
    assert(a == b);
    assert(refcount_context_num_refs(c, a) == 1);

    refcount_context_ref(c, a);
    assert(refcount_context_num_refs(c, a) == 2);

    RefcountWeakref *x = refcount_context_weaken(c, a);
    w = refcount_context_make_weakref(c, a);
    assert(refcount_context_num_refs(c, a) == 1);
    assert(w != x);
    refcount_context_destroy_weakref(c, x);

    refcount_context_ref(c, a);
    assert(refcount_context_num_refs(c, a) == 2);

    x = refcount_context_weaken(c, a);
    assert(refcount_context_num_refs(c, a) == 1);
    assert(w != x);
    assert(refcount_context_weakref_is_valid(c, w));
    assert(refcount_context_weakref_is_valid(c, x));

    assert(!refcount_context_unref(c, a));
    assert(!refcount_context_weakref_is_valid(c, w));
    assert(!refcount_context_weakref_is_valid(c, x));

    refcount_context_destroy_weakref(c, w);
    refcount_context_destroy_weakref(c, x);

    refcount_context_destroy(c);

    check_allocator_status();
    return 0;
}