// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exresnte - AML Interpreter object resolution
 *
 * Copyright (C) 2000 - 2026, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exresnte")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_resolve_node_to_value
 *
 * PARAMETERS:  object_ptr      - Pointer to a location that contains
 *                                a pointer to a NS node, and will receive a
 *                                pointer to the resolved object.
 *              walk_state      - Current state. Valid only if executing AML
 *                                code. NULL if simply resolving an object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Resolve a Namespace node to a valued object
 *
 * Note: for some of the data types, the pointer attached to the Node
 * can be either a pointer to an actual internal object or a pointer into the
 * AML stream itself. These types are currently:
 *
 *      ACPI_TYPE_INTEGER
 *      ACPI_TYPE_STRING
 *      ACPI_TYPE_BUFFER
 *      ACPI_TYPE_MUTEX
 *      ACPI_TYPE_PACKAGE
 *
 ******************************************************************************/
acpi_status
acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
                              struct acpi_walk_state *walk_state)
{
        acpi_status status = AE_OK;
        union acpi_operand_object *source_desc;
        union acpi_operand_object *obj_desc = NULL;
        struct acpi_namespace_node *node;
        acpi_object_type entry_type;

        ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);

        /*
         * The stack pointer points to a struct acpi_namespace_node (Node). Get the
         * object that is attached to the Node.
         */
        node = *object_ptr;
        source_desc = acpi_ns_get_attached_object(node);
        entry_type = acpi_ns_get_type((acpi_handle)node);

        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
                          node, source_desc,
                          acpi_ut_get_type_name(entry_type)));

        if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
            (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {

                /* There is always exactly one level of indirection */

                node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
                source_desc = acpi_ns_get_attached_object(node);
                entry_type = acpi_ns_get_type((acpi_handle)node);
                *object_ptr = node;
        }

        /*
         * Several object types require no further processing:
         * 1) Device/Thermal objects don't have a "real" subobject, return Node
         * 2) Method locals and arguments have a pseudo-Node
         * 3) 10/2007: Added method type to assist with Package construction.
         */
        if ((entry_type == ACPI_TYPE_DEVICE) ||
            (entry_type == ACPI_TYPE_THERMAL) ||
            (entry_type == ACPI_TYPE_METHOD) ||
            (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
                return_ACPI_STATUS(AE_OK);
        }

        if (!source_desc) {
                ACPI_ERROR((AE_INFO, "No object attached to node [%4.4s] %p",
                            node->name.ascii, node));
                return_ACPI_STATUS(AE_AML_UNINITIALIZED_NODE);
        }

        /*
         * Action is based on the type of the Node, which indicates the type
         * of the attached object or pointer
         */
        switch (entry_type) {
        case ACPI_TYPE_PACKAGE:

                if (source_desc->common.type != ACPI_TYPE_PACKAGE) {
                        ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
                                    acpi_ut_get_object_type_name(source_desc)));
                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }

                status = acpi_ds_get_package_arguments(source_desc);
                if (ACPI_SUCCESS(status)) {

                        /* Return an additional reference to the object */

                        obj_desc = source_desc;
                        acpi_ut_add_reference(obj_desc);
                }
                break;

        case ACPI_TYPE_BUFFER:

                if (source_desc->common.type != ACPI_TYPE_BUFFER) {
                        ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
                                    acpi_ut_get_object_type_name(source_desc)));
                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }

                status = acpi_ds_get_buffer_arguments(source_desc);
                if (ACPI_SUCCESS(status)) {

                        /* Return an additional reference to the object */

                        obj_desc = source_desc;
                        acpi_ut_add_reference(obj_desc);
                }
                break;

        case ACPI_TYPE_STRING:

                if (source_desc->common.type != ACPI_TYPE_STRING) {
                        ACPI_ERROR((AE_INFO, "Object not a String, type %s",
                                    acpi_ut_get_object_type_name(source_desc)));
                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }

                /* Return an additional reference to the object */

                obj_desc = source_desc;
                acpi_ut_add_reference(obj_desc);
                break;

        case ACPI_TYPE_INTEGER:

                if (source_desc->common.type != ACPI_TYPE_INTEGER) {
                        ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
                                    acpi_ut_get_object_type_name(source_desc)));
                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }

                /* Return an additional reference to the object */

                obj_desc = source_desc;
                acpi_ut_add_reference(obj_desc);
                break;

        case ACPI_TYPE_BUFFER_FIELD:
        case ACPI_TYPE_LOCAL_REGION_FIELD:
        case ACPI_TYPE_LOCAL_BANK_FIELD:
        case ACPI_TYPE_LOCAL_INDEX_FIELD:

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                  "FieldRead Node=%p SourceDesc=%p Type=%X\n",
                                  node, source_desc, entry_type));

                status =
                    acpi_ex_read_data_from_field(walk_state, source_desc,
                                                 &obj_desc);
                break;

                /* For these objects, just return the object attached to the Node */

        case ACPI_TYPE_MUTEX:
        case ACPI_TYPE_POWER:
        case ACPI_TYPE_PROCESSOR:
        case ACPI_TYPE_EVENT:
        case ACPI_TYPE_REGION:

                /* Return an additional reference to the object */

                obj_desc = source_desc;
                acpi_ut_add_reference(obj_desc);
                break;

                /* TYPE_ANY is untyped, and thus there is no object associated with it */

        case ACPI_TYPE_ANY:

                ACPI_ERROR((AE_INFO,
                            "Untyped entry %p, no attached object!", node));

                return_ACPI_STATUS(AE_AML_OPERAND_TYPE);        /* Cannot be AE_TYPE */

        case ACPI_TYPE_LOCAL_REFERENCE:

                switch (source_desc->reference.class) {
                case ACPI_REFCLASS_TABLE:       /* This is a ddb_handle */
                case ACPI_REFCLASS_REFOF:
                case ACPI_REFCLASS_INDEX:

                        /* Return an additional reference to the object */

                        obj_desc = source_desc;
                        acpi_ut_add_reference(obj_desc);
                        break;

                default:

                        /* No named references are allowed here */

                        ACPI_ERROR((AE_INFO,
                                    "Unsupported Reference type 0x%X",
                                    source_desc->reference.class));

                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
                }
                break;

        default:

                /* Default case is for unknown types */

                ACPI_ERROR((AE_INFO,
                            "Node %p - Unknown object type 0x%X",
                            node, entry_type));

                return_ACPI_STATUS(AE_AML_OPERAND_TYPE);

        }                       /* switch (entry_type) */

        /* Return the object descriptor */

        *object_ptr = (void *)obj_desc;
        return_ACPI_STATUS(status);
}