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

 *

 * Module Name: psscope - Parser scope stack management routines

 *

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

/*

 * Copyright (C) 2000 - 2007, 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>

#define _COMPONENT          ACPI_PARSER

ACPI_MODULE_NAME("psscope")

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

 *

 * FUNCTION:    acpi_ps_get_parent_scope

 *

 * PARAMETERS:  parser_state        - Current parser state object

 *

 * RETURN:      Pointer to an Op object

 *

 * DESCRIPTION: Get parent of current op being parsed

 *

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

union acpi_parse_object *acpi_ps_get_parent_scope(struct acpi_parse_state

                                                  *parser_state)

{

        return (parser_state->scope->parse_scope.op);

}

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

 *

 * FUNCTION:    acpi_ps_has_completed_scope

 *

 * PARAMETERS:  parser_state        - Current parser state object

 *

 * RETURN:      Boolean, TRUE = scope completed.

 *

 * DESCRIPTION: Is parsing of current argument complete?  Determined by

 *              1) AML pointer is at or beyond the end of the scope

 *              2) The scope argument count has reached zero.

 *

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

u8 acpi_ps_has_completed_scope(struct acpi_parse_state * parser_state)

{

        return ((u8)

                ((parser_state->aml >= parser_state->scope->parse_scope.arg_end

                  || !parser_state->scope->parse_scope.arg_count)));

}

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

 *

 * FUNCTION:    acpi_ps_init_scope

 *

 * PARAMETERS:  parser_state        - Current parser state object

 *              Root                - the Root Node of this new scope

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Allocate and init a new scope object

 *

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

acpi_status

acpi_ps_init_scope(struct acpi_parse_state * parser_state,

                   union acpi_parse_object * root_op)

{

        union acpi_generic_state *scope;

        ACPI_FUNCTION_TRACE_PTR(ps_init_scope, root_op);

        scope = acpi_ut_create_generic_state();

        if (!scope) {

                return_ACPI_STATUS(AE_NO_MEMORY);

        }

        scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_RPSCOPE;

        scope->parse_scope.op = root_op;

        scope->parse_scope.arg_count = ACPI_VAR_ARGS;

        scope->parse_scope.arg_end = parser_state->aml_end;

        scope->parse_scope.pkg_end = parser_state->aml_end;

        parser_state->scope = scope;

        parser_state->start_op = root_op;

        return_ACPI_STATUS(AE_OK);

}

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

 *

 * FUNCTION:    acpi_ps_push_scope

 *

 * PARAMETERS:  parser_state        - Current parser state object

 *              Op                  - Current op to be pushed

 *              remaining_args      - List of args remaining

 *              arg_count           - Fixed or variable number of args

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Push current op to begin parsing its argument

 *

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

acpi_status

acpi_ps_push_scope(struct acpi_parse_state *parser_state,

                   union acpi_parse_object *op,

                   u32 remaining_args, u32 arg_count)

{

        union acpi_generic_state *scope;

        ACPI_FUNCTION_TRACE_PTR(ps_push_scope, op);

        scope = acpi_ut_create_generic_state();

        if (!scope) {

                return_ACPI_STATUS(AE_NO_MEMORY);

        }

        scope->common.descriptor_type = ACPI_DESC_TYPE_STATE_PSCOPE;

        scope->parse_scope.op = op;

        scope->parse_scope.arg_list = remaining_args;

        scope->parse_scope.arg_count = arg_count;

        scope->parse_scope.pkg_end = parser_state->pkg_end;

        /* Push onto scope stack */

        acpi_ut_push_generic_state(&parser_state->scope, scope);

        if (arg_count == ACPI_VAR_ARGS) {

                /* Multiple arguments */

                scope->parse_scope.arg_end = parser_state->pkg_end;

        } else {

                /* Single argument */

                scope->parse_scope.arg_end = ACPI_TO_POINTER(ACPI_MAX_PTR);

        }

        return_ACPI_STATUS(AE_OK);

}

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

 *

 * FUNCTION:    acpi_ps_pop_scope

 *

 * PARAMETERS:  parser_state        - Current parser state object

 *              Op                  - Where the popped op is returned

 *              arg_list            - Where the popped "next argument" is

 *                                    returned

 *              arg_count           - Count of objects in arg_list

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Return to parsing a previous op

 *

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

void

acpi_ps_pop_scope(struct acpi_parse_state *parser_state,

                  union acpi_parse_object **op, u32 * arg_list, u32 * arg_count)

{

        union acpi_generic_state *scope = parser_state->scope;

        ACPI_FUNCTION_TRACE(ps_pop_scope);

        /* Only pop the scope if there is in fact a next scope */

        if (scope->common.next) {

                scope = acpi_ut_pop_generic_state(&parser_state->scope);

                /* Return to parsing previous op */

                *op = scope->parse_scope.op;

                *arg_list = scope->parse_scope.arg_list;

                *arg_count = scope->parse_scope.arg_count;

                parser_state->pkg_end = scope->parse_scope.pkg_end;

                /* All done with this scope state structure */

                acpi_ut_delete_generic_state(scope);

        } else {

                /* Empty parse stack, prepare to fetch next opcode */

                *op = NULL;

                *arg_list = 0;

                *arg_count = 0;

        }

        ACPI_DEBUG_PRINT((ACPI_DB_PARSE,

                          "Popped Op %p Args %X\n", *op, *arg_count));

        return_VOID;

}

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

 *

 * FUNCTION:    acpi_ps_cleanup_scope

 *

 * PARAMETERS:  parser_state        - Current parser state object

 *

 * RETURN:      None

 *

 * DESCRIPTION: Destroy available list, remaining stack levels, and return

 *              root scope

 *

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

void acpi_ps_cleanup_scope(struct acpi_parse_state *parser_state)

{

        union acpi_generic_state *scope;

        ACPI_FUNCTION_TRACE_PTR(ps_cleanup_scope, parser_state);

        if (!parser_state) {

                return_VOID;

        }

        /* Delete anything on the scope stack */

        while (parser_state->scope) {

                scope = acpi_ut_pop_generic_state(&parser_state->scope);

                acpi_ut_delete_generic_state(scope);

        }

        return_VOID;

}