// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: pswalk - Parser routines to walk parsed op tree(s)
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*
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* Copyright (C) 2000 - 2020, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acparser.h"
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME("pswalk")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_delete_parse_tree
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*
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* PARAMETERS: subtree_root - Root of tree (or subtree) to delete
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*
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* RETURN: None
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*
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* DESCRIPTION: Delete a portion of or an entire parse tree.
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*
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******************************************************************************/
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#include "amlcode.h"
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void acpi_ps_delete_parse_tree(union acpi_parse_object *subtree_root)
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{
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union acpi_parse_object *op = subtree_root;
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union acpi_parse_object *next = NULL;
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union acpi_parse_object *parent = NULL;
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u32 level = 0;
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ACPI_FUNCTION_TRACE_PTR(ps_delete_parse_tree, subtree_root);
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE_TREES, " root %p\n", subtree_root));
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/* Visit all nodes in the subtree */
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while (op) {
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if (op != parent) {
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/* This is the descending case */
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if (ACPI_IS_DEBUG_ENABLED
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(ACPI_LV_PARSE_TREES, _COMPONENT)) {
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/* This debug option will print the entire parse tree */
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acpi_os_printf(" %*.s%s %p", (level * 4),
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" ",
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acpi_ps_get_opcode_name(op->
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common.
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aml_opcode),
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op);
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if (op->named.aml_opcode == AML_INT_NAMEPATH_OP) {
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acpi_os_printf(" %4.4s",
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op->common.value.string);
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}
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if (op->named.aml_opcode == AML_STRING_OP) {
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acpi_os_printf(" %s",
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op->common.value.string);
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}
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acpi_os_printf("\n");
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}
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/* Look for an argument or child of the current op */
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next = acpi_ps_get_arg(op, 0);
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if (next) {
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/* Still going downward in tree (Op is not completed yet) */
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op = next;
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level++;
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continue;
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}
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}
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/* No more children, this Op is complete. */
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next = op->common.next;
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parent = op->common.parent;
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acpi_ps_free_op(op);
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/* If we are back to the starting point, the walk is complete. */
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if (op == subtree_root) {
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return_VOID;
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}
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if (next) {
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op = next;
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} else {
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level--;
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op = parent;
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}
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}
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return_VOID;
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}
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