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/******************************************************************************
*
* 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 %X\n", *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;
}
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