blob: 9cb07e1e76d9dba5a0b4403350e436606c48bcf4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/******************************************************************************
2 *
3 * Module Name: pswalk - Parser routines to walk parsed op tree(s)
4 *
5 *****************************************************************************/
6
7/*
Bob Moorefbb7a2d2014-02-08 09:42:25 +08008 * Copyright (C) 2000 - 2014, Intel Corp.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <acpi/acpi.h>
Len Browne2f7a772009-01-09 00:30:03 -050045#include "accommon.h"
46#include "acparser.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48#define _COMPONENT ACPI_PARSER
Len Brown4be44fc2005-08-05 00:44:28 -040049ACPI_MODULE_NAME("pswalk")
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51/*******************************************************************************
52 *
53 * FUNCTION: acpi_ps_delete_parse_tree
54 *
55 * PARAMETERS: subtree_root - Root of tree (or subtree) to delete
56 *
57 * RETURN: None
58 *
59 * DESCRIPTION: Delete a portion of or an entire parse tree.
60 *
61 ******************************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040062void acpi_ps_delete_parse_tree(union acpi_parse_object *subtree_root)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
Len Brown4be44fc2005-08-05 00:44:28 -040064 union acpi_parse_object *op = subtree_root;
65 union acpi_parse_object *next = NULL;
66 union acpi_parse_object *parent = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Bob Mooreb229cf92006-04-21 17:15:00 -040068 ACPI_FUNCTION_TRACE_PTR(ps_delete_parse_tree, subtree_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 /* Visit all nodes in the subtree */
71
72 while (op) {
Bob Moore52fc0b02006-10-02 00:00:00 -040073
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 /* Check if we are not ascending */
75
76 if (op != parent) {
Bob Moore52fc0b02006-10-02 00:00:00 -040077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 /* Look for an argument or child of the current op */
79
Len Brown4be44fc2005-08-05 00:44:28 -040080 next = acpi_ps_get_arg(op, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (next) {
Bob Moore52fc0b02006-10-02 00:00:00 -040082
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 /* Still going downward in tree (Op is not completed yet) */
84
85 op = next;
86 continue;
87 }
88 }
89
Robert Moore44f6c012005-04-18 22:49:35 -040090 /* No more children, this Op is complete. */
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 next = op->common.next;
93 parent = op->common.parent;
94
Len Brown4be44fc2005-08-05 00:44:28 -040095 acpi_ps_free_op(op);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Robert Moore44f6c012005-04-18 22:49:35 -040097 /* If we are back to the starting point, the walk is complete. */
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (op == subtree_root) {
100 return_VOID;
101 }
102 if (next) {
103 op = next;
Len Brown4be44fc2005-08-05 00:44:28 -0400104 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 op = parent;
106 }
107 }
Robert Moore44f6c012005-04-18 22:49:35 -0400108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return_VOID;
110}