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/******************************************************************************

 *

 * Module Name: pstree - Parser op tree manipulation/traversal/search

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2004, R. Byron Moore

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include <acpi/acpi.h>

#include <acpi/acparser.h>

#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_PARSER

         ACPI_MODULE_NAME    ("pstree")

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_get_arg

 *

 * PARAMETERS:  Op              - Get an argument for this op

 *              Argn            - Nth argument to get

 *

 * RETURN:      The argument (as an Op object).  NULL if argument does not exist

 *

 * DESCRIPTION: Get the specified op's argument.

 *

 ******************************************************************************/

union acpi_parse_object *

acpi_ps_get_arg (

        union acpi_parse_object         *op,

        u32                             argn)

{

        union acpi_parse_object         *arg = NULL;

        const struct acpi_opcode_info   *op_info;

        ACPI_FUNCTION_ENTRY ();

        /* Get the info structure for this opcode */

        op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);

        if (op_info->class == AML_CLASS_UNKNOWN) {

                /* Invalid opcode or ASCII character */

                return (NULL);

        }

        /* Check if this opcode requires argument sub-objects */

        if (!(op_info->flags & AML_HAS_ARGS)) {

                /* Has no linked argument objects */

                return (NULL);

        }

        /* Get the requested argument object */

        arg = op->common.value.arg;

        while (arg && argn) {

                argn--;

                arg = arg->common.next;

        }

        return (arg);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_append_arg

 *

 * PARAMETERS:  Op              - Append an argument to this Op.

 *              Arg             - Argument Op to append

 *

 * RETURN:      None.

 *

 * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)

 *

 ******************************************************************************/

void

acpi_ps_append_arg (

        union acpi_parse_object         *op,

        union acpi_parse_object         *arg)

{

        union acpi_parse_object         *prev_arg;

        const struct acpi_opcode_info   *op_info;

        ACPI_FUNCTION_ENTRY ();

        if (!op) {

                return;

        }

        /* Get the info structure for this opcode */

        op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);

        if (op_info->class == AML_CLASS_UNKNOWN) {

                /* Invalid opcode */

                ACPI_REPORT_ERROR (("ps_append_arg: Invalid AML Opcode: 0x%2.2X\n",

                        op->common.aml_opcode));

                return;

        }

        /* Check if this opcode requires argument sub-objects */

        if (!(op_info->flags & AML_HAS_ARGS)) {

                /* Has no linked argument objects */

                return;

        }

        /* Append the argument to the linked argument list */

        if (op->common.value.arg) {

                /* Append to existing argument list */

                prev_arg = op->common.value.arg;

                while (prev_arg->common.next) {

                        prev_arg = prev_arg->common.next;

                }

                prev_arg->common.next = arg;

        }

        else {

                /* No argument list, this will be the first argument */

                op->common.value.arg = arg;

        }

        /* Set the parent in this arg and any args linked after it */

        while (arg) {

                arg->common.parent = op;

                arg = arg->common.next;

        }

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_get_child

 *

 * PARAMETERS:  Op              - Get the child of this Op

 *

 * RETURN:      Child Op, Null if none is found.

 *

 * DESCRIPTION: Get op's children or NULL if none

 *

 ******************************************************************************/

union acpi_parse_object *

acpi_ps_get_child (

        union acpi_parse_object         *op)

{

        union acpi_parse_object         *child = NULL;

        ACPI_FUNCTION_ENTRY ();

        switch (op->common.aml_opcode) {

        case AML_SCOPE_OP:

        case AML_ELSE_OP:

        case AML_DEVICE_OP:

        case AML_THERMAL_ZONE_OP:

        case AML_INT_METHODCALL_OP:

                child = acpi_ps_get_arg (op, 0);

                break;

        case AML_BUFFER_OP:

        case AML_PACKAGE_OP:

        case AML_METHOD_OP:

        case AML_IF_OP:

        case AML_WHILE_OP:

        case AML_FIELD_OP:

                child = acpi_ps_get_arg (op, 1);

                break;

        case AML_POWER_RES_OP:

        case AML_INDEX_FIELD_OP:

                child = acpi_ps_get_arg (op, 2);

                break;

        case AML_PROCESSOR_OP:

        case AML_BANK_FIELD_OP:

                child = acpi_ps_get_arg (op, 3);

                break;

        default:

                /* All others have no children */

                break;

        }

        return (child);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_get_depth_next

 *

 * PARAMETERS:  Origin          - Root of subtree to search

 *              Op              - Last (previous) Op that was found

 *

 * RETURN:      Next Op found in the search.

 *

 * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)

 *              Return NULL when reaching "origin" or when walking up from root

 *

 ******************************************************************************/

union acpi_parse_object *

acpi_ps_get_depth_next (

        union acpi_parse_object         *origin,

        union acpi_parse_object         *op)

{

        union acpi_parse_object         *next = NULL;

        union acpi_parse_object         *parent;

        union acpi_parse_object         *arg;

        ACPI_FUNCTION_ENTRY ();

        if (!op) {

                return (NULL);

        }

        /* look for an argument or child */

        next = acpi_ps_get_arg (op, 0);

        if (next) {

                return (next);

        }

        /* look for a sibling */

        next = op->common.next;

        if (next) {

                return (next);

        }

        /* look for a sibling of parent */

        parent = op->common.parent;

        while (parent) {

                arg = acpi_ps_get_arg (parent, 0);

                while (arg && (arg != origin) && (arg != op)) {

                        arg = arg->common.next;

                }

                if (arg == origin) {

                        /* reached parent of origin, end search */

                        return (NULL);

                }

                if (parent->common.next) {

                        /* found sibling of parent */

                        return (parent->common.next);

                }

                op = parent;

                parent = parent->common.parent;

        }

        return (next);

}