/******************************************************************************
*
* Module Name: dswscope - Scope stack manipulation
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, 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/acdispat.h>
#define _COMPONENT ACPI_DISPATCHER
ACPI_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 (
struct acpi_walk_state *walk_state)
{
union acpi_generic_state *scope_info;
ACPI_FUNCTION_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 (%s)\n", acpi_ut_get_type_name (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 (
struct acpi_namespace_node *node,
acpi_object_type type,
struct acpi_walk_state *walk_state)
{
union acpi_generic_state *scope_info;
union acpi_generic_state *old_scope_info;
ACPI_FUNCTION_TRACE ("ds_scope_stack_push");
if (!node) {
/* Invalid scope */
ACPI_REPORT_ERROR (("ds_scope_stack_push: null scope passed\n"));
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Make sure object type is valid */
if (!acpi_ut_valid_object_type (type)) {
ACPI_REPORT_WARNING (("ds_scope_stack_push: Invalid object type: 0x%X\n", type));
}
/* 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;
walk_state->scope_depth++;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"[%.2d] Pushed scope ", (u32) walk_state->scope_depth));
old_scope_info = walk_state->scope_info;
if (old_scope_info) {
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
"[%4.4s] (%s)",
acpi_ut_get_node_name (old_scope_info->scope.node),
acpi_ut_get_type_name (old_scope_info->common.value)));
}
else {
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
"[\\___] (%s)", "ROOT"));
}
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
", New scope -> [%4.4s] (%s)\n",
acpi_ut_get_node_name (scope_info->scope.node),
acpi_ut_get_type_name (scope_info->common.value)));
/* 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 (
struct acpi_walk_state *walk_state)
{
union acpi_generic_state *scope_info;
union acpi_generic_state *new_scope_info;
ACPI_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);
}
walk_state->scope_depth--;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
(u32) walk_state->scope_depth,
acpi_ut_get_node_name (scope_info->scope.node),
acpi_ut_get_type_name (scope_info->common.value)));
new_scope_info = walk_state->scope_info;
if (new_scope_info) {
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
"[%4.4s] (%s)\n",
acpi_ut_get_node_name (new_scope_info->scope.node),
acpi_ut_get_type_name (new_scope_info->common.value)));
}
else {
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
"[\\___] (ROOT)\n"));
}
acpi_ut_delete_generic_state (scope_info);
return_ACPI_STATUS (AE_OK);
}
