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psscope.c：源码内容
							/******************************************************************************
 *
 * Module Name: psscope - Parser scope stack management routines
 *              $Revision: 30 $
 *
 *****************************************************************************/
/*
 *  Copyright (C) 2000, 2001 R. Byron Moore
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "acpi.h"
#include "acparser.h"
#define _COMPONENT          ACPI_PARSER
	 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
 *
 ******************************************************************************/
acpi_parse_object *
acpi_ps_get_parent_scope (
	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 (
	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 (
	acpi_parse_state        *parser_state,
	acpi_parse_object       *root_op)
{
	acpi_generic_state      *scope;
	FUNCTION_TRACE_PTR ("Ps_init_scope", root_op);
	scope = acpi_ut_create_generic_state ();
	if (!scope) {
		return_ACPI_STATUS (AE_NO_MEMORY);
	}
	scope->common.data_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 (
	acpi_parse_state        *parser_state,
	acpi_parse_object       *op,
	u32                     remaining_args,
	u32                     arg_count)
{
	acpi_generic_state      *scope;
	FUNCTION_TRACE_PTR ("Ps_push_scope", op);
	scope = acpi_ut_create_generic_state ();
	if (!scope) {
		return (AE_NO_MEMORY);
	}
	scope->common.data_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_MAX_AML;
	}
	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 (
	acpi_parse_state        *parser_state,
	acpi_parse_object       **op,
	u32                     *arg_list,
	u32                     *arg_count)
{
	acpi_generic_state      *scope = parser_state->scope;
	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 %Xn", *op, *arg_count));
	return_VOID;
}
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ps_cleanup_scope
 *
 * PARAMETERS:  Parser_state        - Current parser state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Destroy available list, remaining stack levels, and return
 *              root scope
 *
 ******************************************************************************/
void
acpi_ps_cleanup_scope (
	acpi_parse_state        *parser_state)
{
	acpi_generic_state      *scope;
	FUNCTION_TRACE_PTR ("Ps_cleanup_scope", parser_state);
	if (!parser_state) {
		return;
	}
	/* 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;
}

						