utdelete.c

acpi tools for linux include acpiexec and acpixtract

void
AcpiUtDeleteInternalObjectList (
    ACPI_OPERAND_OBJECT     **ObjList)
{
    ACPI_OPERAND_OBJECT     **InternalObj;


    ACPI_FUNCTION_TRACE (UtDeleteInternalObjectList);


    /* Walk the null-terminated internal list */

    for (InternalObj = ObjList; *InternalObj; InternalObj++)
    {
        AcpiUtRemoveReference (*InternalObj);
    }

    /* Free the combined parameter pointer list and object array */

    ACPI_FREE (ObjList);
    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtUpdateRefCount
 *
 * PARAMETERS:  Object          - Object whose ref count is to be updated
 *              Action          - What to do
 *
 * RETURN:      New ref count
 *
 * DESCRIPTION: Modify the ref count and return it.
 *
 ******************************************************************************/

static void
AcpiUtUpdateRefCount (
    ACPI_OPERAND_OBJECT     *Object,
    UINT32                  Action)
{
    UINT16                  Count;
    UINT16                  NewCount;


    ACPI_FUNCTION_NAME (UtUpdateRefCount);


    if (!Object)
    {
        return;
    }

    Count = Object->Common.ReferenceCount;
    NewCount = Count;

    /*
     * Perform the reference count action (increment, decrement, force delete)
     */
    switch (Action)
    {
    case REF_INCREMENT:

        NewCount++;
        Object->Common.ReferenceCount = NewCount;

        ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
            "Obj %p Refs=%X, [Incremented]\n",
            Object, NewCount));
        break;

    case REF_DECREMENT:

        if (Count < 1)
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
                Object, NewCount));

            NewCount = 0;
        }
        else
        {
            NewCount--;

            ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                "Obj %p Refs=%X, [Decremented]\n",
                Object, NewCount));
        }

        if (ACPI_GET_OBJECT_TYPE (Object) == ACPI_TYPE_METHOD)
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                "Method Obj %p Refs=%X, [Decremented]\n", Object, NewCount));
        }

        Object->Common.ReferenceCount = NewCount;
        if (NewCount == 0)
        {
            AcpiUtDeleteInternalObj (Object);
        }
        break;

    case REF_FORCE_DELETE:

        ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
            "Obj %p Refs=%X, Force delete! (Set to 0)\n", Object, Count));

        NewCount = 0;
        Object->Common.ReferenceCount = NewCount;
        AcpiUtDeleteInternalObj (Object);
        break;

    default:

        ACPI_ERROR ((AE_INFO, "Unknown action (%X)", Action));
        break;
    }

    /*
     * Sanity check the reference count, for debug purposes only.
     * (A deleted object will have a huge reference count)
     */
    if (Count > ACPI_MAX_REFERENCE_COUNT)
    {
        ACPI_WARNING ((AE_INFO,
            "Large Reference Count (%X) in object %p", Count, Object));
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtUpdateObjectReference
 *
 * PARAMETERS:  Object              - Increment ref count for this object
 *                                    and all sub-objects
 *              Action              - Either REF_INCREMENT or REF_DECREMENT or
 *                                    REF_FORCE_DELETE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Increment the object reference count
 *
 * Object references are incremented when:
 * 1) An object is attached to a Node (namespace object)
 * 2) An object is copied (all subobjects must be incremented)
 *
 * Object references are decremented when:
 * 1) An object is detached from an Node
 *
 ******************************************************************************/

ACPI_STATUS
AcpiUtUpdateObjectReference (
    ACPI_OPERAND_OBJECT     *Object,
    UINT16                  Action)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_GENERIC_STATE      *StateList = NULL;
    ACPI_OPERAND_OBJECT     *NextObject = NULL;
    ACPI_GENERIC_STATE      *State;
    ACPI_NATIVE_UINT        i;


    ACPI_FUNCTION_TRACE_PTR (UtUpdateObjectReference, Object);


    while (Object)
    {
        /* Make sure that this isn't a namespace handle */

        if (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED)
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
                "Object %p is NS handle\n", Object));
            return_ACPI_STATUS (AE_OK);
        }

        /*
         * All sub-objects must have their reference count incremented also.
         * Different object types have different subobjects.
         */
        switch (ACPI_GET_OBJECT_TYPE (Object))
        {
        case ACPI_TYPE_DEVICE:
        case ACPI_TYPE_PROCESSOR:
        case ACPI_TYPE_POWER:
        case ACPI_TYPE_THERMAL:

            /* Update the notify objects for these types (if present) */

            AcpiUtUpdateRefCount (Object->CommonNotify.SystemNotify, Action);
            AcpiUtUpdateRefCount (Object->CommonNotify.DeviceNotify, Action);
            break;

        case ACPI_TYPE_PACKAGE:
            /*
             * We must update all the sub-objects of the package,
             * each of whom may have their own sub-objects.
             */
            for (i = 0; i < Object->Package.Count; i++)
            {
                /*
                 * Push each element onto the stack for later processing.
                 * Note: There can be null elements within the package,
                 * these are simply ignored
                 */
                Status = AcpiUtCreateUpdateStateAndPush (
                            Object->Package.Elements[i], Action, &StateList);
                if (ACPI_FAILURE (Status))
                {
                    goto ErrorExit;
                }
            }
            break;

        case ACPI_TYPE_BUFFER_FIELD:

            NextObject = Object->BufferField.BufferObj;
            break;

        case ACPI_TYPE_LOCAL_REGION_FIELD:

            NextObject = Object->Field.RegionObj;
            break;

        case ACPI_TYPE_LOCAL_BANK_FIELD:

            NextObject = Object->BankField.BankObj;
            Status = AcpiUtCreateUpdateStateAndPush (
                        Object->BankField.RegionObj, Action, &StateList);
            if (ACPI_FAILURE (Status))
            {
                goto ErrorExit;
            }
            break;

        case ACPI_TYPE_LOCAL_INDEX_FIELD:

            NextObject = Object->IndexField.IndexObj;
            Status = AcpiUtCreateUpdateStateAndPush (
                        Object->IndexField.DataObj, Action, &StateList);
            if (ACPI_FAILURE (Status))
            {
                goto ErrorExit;
            }
            break;

        case ACPI_TYPE_LOCAL_REFERENCE:
            /*
             * The target of an Index (a package, string, or buffer) or a named
             * reference must track changes to the ref count of the index or
             * target object.
             */
            if ((Object->Reference.Opcode == AML_INDEX_OP) ||
                (Object->Reference.Opcode == AML_INT_NAMEPATH_OP))
            {
                NextObject = Object->Reference.Object;
            }
            break;

        case ACPI_TYPE_REGION:
        default:
            break; /* No subobjects for all other types */
        }

        /*
         * Now we can update the count in the main object. This can only
         * happen after we update the sub-objects in case this causes the
         * main object to be deleted.
         */
        AcpiUtUpdateRefCount (Object, Action);
        Object = NULL;

        /* Move on to the next object to be updated */

        if (NextObject)
        {
            Object = NextObject;
            NextObject = NULL;
        }
        else if (StateList)
        {
            State = AcpiUtPopGenericState (&StateList);
            Object = State->Update.Object;
            AcpiUtDeleteGenericState (State);
        }
    }

    return_ACPI_STATUS (AE_OK);

ErrorExit:

    ACPI_EXCEPTION ((AE_INFO, Status,
        "Could not update object reference count"));

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtAddReference
 *
 * PARAMETERS:  Object          - Object whose reference count is to be
 *                                incremented
 *
 * RETURN:      None
 *
 * DESCRIPTION: Add one reference to an ACPI object
 *
 ******************************************************************************/

void
AcpiUtAddReference (
    ACPI_OPERAND_OBJECT     *Object)
{

    ACPI_FUNCTION_TRACE_PTR (UtAddReference, Object);


    /* Ensure that we have a valid object */

    if (!AcpiUtValidInternalObject (Object))
    {
        return_VOID;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
        "Obj %p Current Refs=%X [To Be Incremented]\n",
        Object, Object->Common.ReferenceCount));

    /* Increment the reference count */

    (void) AcpiUtUpdateObjectReference (Object, REF_INCREMENT);
    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtRemoveReference
 *
 * PARAMETERS:  Object         - Object whose ref count will be decremented
 *
 * RETURN:      None
 *
 * DESCRIPTION: Decrement the reference count of an ACPI internal object
 *
 ******************************************************************************/

void
AcpiUtRemoveReference (
    ACPI_OPERAND_OBJECT     *Object)
{

    ACPI_FUNCTION_TRACE_PTR (UtRemoveReference, Object);


    /*
     * Allow a NULL pointer to be passed in, just ignore it. This saves
     * each caller from having to check. Also, ignore NS nodes.
     *
     */
    if (!Object ||
        (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED))

    {
        return_VOID;
    }

    /* Ensure that we have a valid object */

    if (!AcpiUtValidInternalObject (Object))
    {
        return_VOID;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
        "Obj %p Current Refs=%X [To Be Decremented]\n",
        Object, Object->Common.ReferenceCount));

    /*
     * Decrement the reference count, and only actually delete the object
     * if the reference count becomes 0. (Must also decrement the ref count
     * of all subobjects!)
     */
    (void) AcpiUtUpdateObjectReference (Object, REF_DECREMENT);
    return_VOID;
}