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