// Object manager. This file owns reference-counted kernel objects and handle-table lifetime rules.

#include <string.h>
#include <intrin.h>
#include <kernel/ob_object.h>
#include <kernel/mm_virt.h>

// Creates object.
__declspec(dllexport) OBJECT* ObAllocateObject(OBJECT_TYPE type, size_t size) {
    if (size < sizeof(OBJECT)) size = sizeof(OBJECT);

    OBJECT* obj = (OBJECT *)MmAllocatePool(size);
    if (!obj) return (OBJECT *)0;

    memset(obj, 0, size);
    obj->Type     = type;
    obj->RefCount = 1;
    obj->Destroy  = (void *)0; // caller fills this in
    return obj;
}

// Implements the reference Object operation.
__declspec(dllexport) void ObReferenceObject(OBJECT* object) {
    if (!object) return;
    _InterlockedIncrement(&object->RefCount);
}

// Implements the dereference Object operation.
__declspec(dllexport) void ObDereferenceObject(OBJECT* object) {
    if (!object) return;
    long prev = _InterlockedDecrement(&object->RefCount);
    if (prev == 0) {
        // Reference count hit zero - run the destructor then free.
        if (object->Destroy) {
            object->Destroy(object);
        }
        MmFreePool(object);
    }
}