Quelle  dswscope.c   Sprache: C

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: dswscope - Scope stack manipulation
 *
 * Copyright (C) 2000 - 2025, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswscope")

/****************************************************************************
 *
 * FUNCTION:    acpi_ds_scope_stack_clear
 *
 * PARAMETERS:  walk_state      - Current state
 *
 * RETURN:      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
 *              walk_state      - Current state
 *
 * RETURN:      Status
 *
 * 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_ERROR((AE_INFO, "Null scope parameter"));
  return_ACPI_STATUS(AE_BAD_PARAMETER);
 }

 /* Make sure object type is valid */

 if (!acpi_ut_valid_object_type(type)) {
  ACPI_WARNING((AE_INFO, "Invalid object type: 0x%X", 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.descriptor_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, ACPI_NAMESPACE_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:  walk_state      - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop the scope stack once.
 *
 ***************************************************************************/

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, "%s\n",
          ACPI_NAMESPACE_ROOT));
 }

 acpi_ut_delete_generic_state(scope_info);
 return_ACPI_STATUS(AE_OK);
}