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/******************************************************************************
*
* Module Name: dswscope - Scope stack manipulation
* $Revision: 49 $
*
*****************************************************************************/
/*
* 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 "acinterp.h"
#include "acdispat.h"
#define _COMPONENT ACPI_DISPATCHER
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 (
acpi_walk_state *walk_state)
{
acpi_generic_state *scope_info;
PROC_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 %X\n", 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 (
acpi_namespace_node *node,
acpi_object_type8 type,
acpi_walk_state *walk_state)
{
acpi_generic_state *scope_info;
FUNCTION_TRACE ("Ds_scope_stack_push");
if (!node) {
/* Invalid scope */
REPORT_ERROR (("Ds_scope_stack_push: null scope passed\n"));
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Make sure object type is valid */
if (!acpi_ex_validate_object_type (type)) {
REPORT_WARNING (("Ds_scope_stack_push: type code out of range\n"));
}
/* 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;
/* 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 (
acpi_walk_state *walk_state)
{
acpi_generic_state *scope_info;
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);
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Popped object type %X\n", scope_info->common.value));
acpi_ut_delete_generic_state (scope_info);
return_ACPI_STATUS (AE_OK);
}
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