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Linux kernel mirror (for testing)
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1/******************************************************************************
2 *
3 * Module Name: pswalk - Parser routines to walk parsed op tree(s)
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2005, R. Byron Moore
9 * 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
44
45#include <acpi/acpi.h>
46#include <acpi/acparser.h>
47
48#define _COMPONENT ACPI_PARSER
49 ACPI_MODULE_NAME ("pswalk")
50
51
52/*******************************************************************************
53 *
54 * FUNCTION: acpi_ps_delete_parse_tree
55 *
56 * PARAMETERS: subtree_root - Root of tree (or subtree) to delete
57 *
58 * RETURN: None
59 *
60 * DESCRIPTION: Delete a portion of or an entire parse tree.
61 *
62 ******************************************************************************/
63
64void
65acpi_ps_delete_parse_tree (
66 union acpi_parse_object *subtree_root)
67{
68 union acpi_parse_object *op = subtree_root;
69 union acpi_parse_object *next = NULL;
70 union acpi_parse_object *parent = NULL;
71
72
73 ACPI_FUNCTION_TRACE_PTR ("ps_delete_parse_tree", subtree_root);
74
75
76 /* Visit all nodes in the subtree */
77
78 while (op) {
79 /* Check if we are not ascending */
80
81 if (op != parent) {
82 /* Look for an argument or child of the current op */
83
84 next = acpi_ps_get_arg (op, 0);
85 if (next) {
86 /* Still going downward in tree (Op is not completed yet) */
87
88 op = next;
89 continue;
90 }
91 }
92
93 /* No more children, this Op is complete. */
94
95 next = op->common.next;
96 parent = op->common.parent;
97
98 acpi_ps_free_op (op);
99
100 /* If we are back to the starting point, the walk is complete. */
101
102 if (op == subtree_root) {
103 return_VOID;
104 }
105 if (next) {
106 op = next;
107 }
108 else {
109 op = parent;
110 }
111 }
112
113 return_VOID;
114}