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psscope.c

/******************************************************************************
 *
 * 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;
}

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