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

 *

 * Module Name: dswscope - Scope stack manipulation

 *

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

/*

 * 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/acdispat.h>

#define _COMPONENT          ACPI_DISPATCHER

         ACPI_MODULE_NAME    ("dswscope")

#define STACK_POP(head) head

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

 *

 * FUNCTION:    acpi_ds_scope_stack_clear

 *

 * PARAMETERS:  None

 *

 * DESCRIPTION: Pop (and free) everything on the scope stack except the

 *              root scope object (which remains at the stack top.)

 *

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

void

acpi_ds_scope_stack_clear (

        struct acpi_walk_state          *walk_state)

{

        union acpi_generic_state        *scope_info;

        ACPI_FUNCTION_NAME ("ds_scope_stack_clear");

        while (walk_state->scope_info) {

                /* Pop a scope off the stack */

                scope_info = walk_state->scope_info;

                walk_state->scope_info = scope_info->scope.next;

                ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

                        "Popped object type (%s)\n", acpi_ut_get_type_name (scope_info->common.value)));

                acpi_ut_delete_generic_state (scope_info);

        }

}

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

 *

 * FUNCTION:    acpi_ds_scope_stack_push

 *

 * PARAMETERS:  *Node,              - Name to be made current

 *              Type,               - Type of frame being pushed

 *

 * DESCRIPTION: Push the current scope on the scope stack, and make the

 *              passed Node current.

 *

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

acpi_status

acpi_ds_scope_stack_push (

        struct acpi_namespace_node      *node,

        acpi_object_type                type,

        struct acpi_walk_state          *walk_state)

{

        union acpi_generic_state        *scope_info;

        union acpi_generic_state        *old_scope_info;

        ACPI_FUNCTION_TRACE ("ds_scope_stack_push");

        if (!node) {

                /* Invalid scope   */

                ACPI_REPORT_ERROR (("ds_scope_stack_push: null scope passed\n"));

                return_ACPI_STATUS (AE_BAD_PARAMETER);

        }

        /* Make sure object type is valid */

        if (!acpi_ut_valid_object_type (type)) {

                ACPI_REPORT_WARNING (("ds_scope_stack_push: Invalid object type: 0x%X\n", type));

        }

        /* Allocate a new scope object */

        scope_info = acpi_ut_create_generic_state ();

        if (!scope_info) {

                return_ACPI_STATUS (AE_NO_MEMORY);

        }

        /* Init new scope object */

        scope_info->common.data_type = ACPI_DESC_TYPE_STATE_WSCOPE;

        scope_info->scope.node      = node;

        scope_info->common.value    = (u16) type;

        walk_state->scope_depth++;

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

                "[%.2d] Pushed scope ", (u32) walk_state->scope_depth));

        old_scope_info = walk_state->scope_info;

        if (old_scope_info) {

                ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,

                        "[%4.4s] (%s)",

                        acpi_ut_get_node_name (old_scope_info->scope.node),

                        acpi_ut_get_type_name (old_scope_info->common.value)));

        }

        else {

                ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,

                        "[\\___] (%s)", "ROOT"));

        }

        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,

                ", New scope -> [%4.4s] (%s)\n",

                acpi_ut_get_node_name (scope_info->scope.node),

                acpi_ut_get_type_name (scope_info->common.value)));

        /* Push new scope object onto stack */

        acpi_ut_push_generic_state (&walk_state->scope_info, scope_info);

        return_ACPI_STATUS (AE_OK);

}

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

 *

 * FUNCTION:    acpi_ds_scope_stack_pop

 *

 * PARAMETERS:  Type                - The type of frame to be found

 *

 * DESCRIPTION: Pop the scope stack until a frame of the requested type

 *              is found.

 *

 * RETURN:      Count of frames popped.  If no frame of the requested type

 *              was found, the count is returned as a negative number and

 *              the scope stack is emptied (which sets the current scope

 *              to the root).  If the scope stack was empty at entry, the

 *              function is a no-op and returns 0.

 *

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

acpi_status

acpi_ds_scope_stack_pop (

        struct acpi_walk_state          *walk_state)

{

        union acpi_generic_state        *scope_info;

        union acpi_generic_state        *new_scope_info;

        ACPI_FUNCTION_TRACE ("ds_scope_stack_pop");

        /*

         * Pop scope info object off the stack.

         */

        scope_info = acpi_ut_pop_generic_state (&walk_state->scope_info);

        if (!scope_info) {

                return_ACPI_STATUS (AE_STACK_UNDERFLOW);

        }

        walk_state->scope_depth--;

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

                "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",

                (u32) walk_state->scope_depth,

                acpi_ut_get_node_name (scope_info->scope.node),

                acpi_ut_get_type_name (scope_info->common.value)));

        new_scope_info = walk_state->scope_info;

        if (new_scope_info) {

                ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,

                        "[%4.4s] (%s)\n",

                        acpi_ut_get_node_name (new_scope_info->scope.node),

                        acpi_ut_get_type_name (new_scope_info->common.value)));

        }

        else {

                ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,

                        "[\\___] (ROOT)\n"));

        }

        acpi_ut_delete_generic_state (scope_info);

        return_ACPI_STATUS (AE_OK);

}