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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: pstree - Parser op tree manipulation/traversal/search | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acparser.h" | |
47 | #include "amlcode.h" | |
1da177e4 LT |
48 | |
49 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 50 | ACPI_MODULE_NAME("pstree") |
1da177e4 | 51 | |
44f6c012 | 52 | /* Local prototypes */ |
44f6c012 | 53 | #ifdef ACPI_OBSOLETE_FUNCTIONS |
4be44fcd | 54 | union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op); |
44f6c012 RM |
55 | #endif |
56 | ||
1da177e4 LT |
57 | /******************************************************************************* |
58 | * | |
59 | * FUNCTION: acpi_ps_get_arg | |
60 | * | |
61 | * PARAMETERS: Op - Get an argument for this op | |
62 | * Argn - Nth argument to get | |
63 | * | |
44f6c012 | 64 | * RETURN: The argument (as an Op object). NULL if argument does not exist |
1da177e4 LT |
65 | * |
66 | * DESCRIPTION: Get the specified op's argument. | |
67 | * | |
68 | ******************************************************************************/ | |
69 | ||
4be44fcd | 70 | union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn) |
1da177e4 | 71 | { |
4be44fcd LB |
72 | union acpi_parse_object *arg = NULL; |
73 | const struct acpi_opcode_info *op_info; | |
1da177e4 | 74 | |
4be44fcd | 75 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
76 | |
77 | /* Get the info structure for this opcode */ | |
78 | ||
4be44fcd | 79 | op_info = acpi_ps_get_opcode_info(op->common.aml_opcode); |
1da177e4 | 80 | if (op_info->class == AML_CLASS_UNKNOWN) { |
52fc0b02 | 81 | |
1da177e4 LT |
82 | /* Invalid opcode or ASCII character */ |
83 | ||
84 | return (NULL); | |
85 | } | |
86 | ||
87 | /* Check if this opcode requires argument sub-objects */ | |
88 | ||
89 | if (!(op_info->flags & AML_HAS_ARGS)) { | |
52fc0b02 | 90 | |
1da177e4 LT |
91 | /* Has no linked argument objects */ |
92 | ||
93 | return (NULL); | |
94 | } | |
95 | ||
96 | /* Get the requested argument object */ | |
97 | ||
98 | arg = op->common.value.arg; | |
99 | while (arg && argn) { | |
100 | argn--; | |
101 | arg = arg->common.next; | |
102 | } | |
103 | ||
104 | return (arg); | |
105 | } | |
106 | ||
1da177e4 LT |
107 | /******************************************************************************* |
108 | * | |
109 | * FUNCTION: acpi_ps_append_arg | |
110 | * | |
111 | * PARAMETERS: Op - Append an argument to this Op. | |
112 | * Arg - Argument Op to append | |
113 | * | |
114 | * RETURN: None. | |
115 | * | |
116 | * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK) | |
117 | * | |
118 | ******************************************************************************/ | |
119 | ||
120 | void | |
4be44fcd | 121 | acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg) |
1da177e4 | 122 | { |
4be44fcd LB |
123 | union acpi_parse_object *prev_arg; |
124 | const struct acpi_opcode_info *op_info; | |
1da177e4 | 125 | |
4be44fcd | 126 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
127 | |
128 | if (!op) { | |
129 | return; | |
130 | } | |
131 | ||
132 | /* Get the info structure for this opcode */ | |
133 | ||
4be44fcd | 134 | op_info = acpi_ps_get_opcode_info(op->common.aml_opcode); |
1da177e4 | 135 | if (op_info->class == AML_CLASS_UNKNOWN) { |
52fc0b02 | 136 | |
1da177e4 LT |
137 | /* Invalid opcode */ |
138 | ||
b8e4d893 BM |
139 | ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X", |
140 | op->common.aml_opcode)); | |
1da177e4 LT |
141 | return; |
142 | } | |
143 | ||
144 | /* Check if this opcode requires argument sub-objects */ | |
145 | ||
146 | if (!(op_info->flags & AML_HAS_ARGS)) { | |
52fc0b02 | 147 | |
1da177e4 LT |
148 | /* Has no linked argument objects */ |
149 | ||
150 | return; | |
151 | } | |
152 | ||
1da177e4 LT |
153 | /* Append the argument to the linked argument list */ |
154 | ||
155 | if (op->common.value.arg) { | |
52fc0b02 | 156 | |
1da177e4 LT |
157 | /* Append to existing argument list */ |
158 | ||
159 | prev_arg = op->common.value.arg; | |
160 | while (prev_arg->common.next) { | |
161 | prev_arg = prev_arg->common.next; | |
162 | } | |
163 | prev_arg->common.next = arg; | |
4be44fcd | 164 | } else { |
1da177e4 LT |
165 | /* No argument list, this will be the first argument */ |
166 | ||
167 | op->common.value.arg = arg; | |
168 | } | |
169 | ||
1da177e4 LT |
170 | /* Set the parent in this arg and any args linked after it */ |
171 | ||
172 | while (arg) { | |
173 | arg->common.parent = op; | |
174 | arg = arg->common.next; | |
4e3156b1 BM |
175 | |
176 | op->common.arg_list_length++; | |
1da177e4 LT |
177 | } |
178 | } | |
179 | ||
1da177e4 | 180 | #ifdef ACPI_FUTURE_USAGE |
1da177e4 LT |
181 | /******************************************************************************* |
182 | * | |
183 | * FUNCTION: acpi_ps_get_depth_next | |
184 | * | |
185 | * PARAMETERS: Origin - Root of subtree to search | |
186 | * Op - Last (previous) Op that was found | |
187 | * | |
188 | * RETURN: Next Op found in the search. | |
189 | * | |
190 | * DESCRIPTION: Get next op in tree (walking the tree in depth-first order) | |
191 | * Return NULL when reaching "origin" or when walking up from root | |
192 | * | |
193 | ******************************************************************************/ | |
194 | ||
4be44fcd LB |
195 | union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin, |
196 | union acpi_parse_object *op) | |
1da177e4 | 197 | { |
4be44fcd LB |
198 | union acpi_parse_object *next = NULL; |
199 | union acpi_parse_object *parent; | |
200 | union acpi_parse_object *arg; | |
1da177e4 | 201 | |
4be44fcd | 202 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
203 | |
204 | if (!op) { | |
205 | return (NULL); | |
206 | } | |
207 | ||
44f6c012 | 208 | /* Look for an argument or child */ |
1da177e4 | 209 | |
4be44fcd | 210 | next = acpi_ps_get_arg(op, 0); |
1da177e4 LT |
211 | if (next) { |
212 | return (next); | |
213 | } | |
214 | ||
44f6c012 | 215 | /* Look for a sibling */ |
1da177e4 LT |
216 | |
217 | next = op->common.next; | |
218 | if (next) { | |
219 | return (next); | |
220 | } | |
221 | ||
44f6c012 | 222 | /* Look for a sibling of parent */ |
1da177e4 LT |
223 | |
224 | parent = op->common.parent; | |
225 | ||
226 | while (parent) { | |
4be44fcd | 227 | arg = acpi_ps_get_arg(parent, 0); |
1da177e4 LT |
228 | while (arg && (arg != origin) && (arg != op)) { |
229 | arg = arg->common.next; | |
230 | } | |
231 | ||
232 | if (arg == origin) { | |
52fc0b02 | 233 | |
44f6c012 | 234 | /* Reached parent of origin, end search */ |
1da177e4 LT |
235 | |
236 | return (NULL); | |
237 | } | |
238 | ||
239 | if (parent->common.next) { | |
52fc0b02 | 240 | |
44f6c012 | 241 | /* Found sibling of parent */ |
1da177e4 LT |
242 | |
243 | return (parent->common.next); | |
244 | } | |
245 | ||
246 | op = parent; | |
247 | parent = parent->common.parent; | |
248 | } | |
249 | ||
250 | return (next); | |
251 | } | |
252 | ||
44f6c012 RM |
253 | #ifdef ACPI_OBSOLETE_FUNCTIONS |
254 | /******************************************************************************* | |
255 | * | |
256 | * FUNCTION: acpi_ps_get_child | |
257 | * | |
258 | * PARAMETERS: Op - Get the child of this Op | |
259 | * | |
260 | * RETURN: Child Op, Null if none is found. | |
261 | * | |
262 | * DESCRIPTION: Get op's children or NULL if none | |
263 | * | |
264 | ******************************************************************************/ | |
265 | ||
4be44fcd | 266 | union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op) |
44f6c012 | 267 | { |
4be44fcd | 268 | union acpi_parse_object *child = NULL; |
44f6c012 | 269 | |
4be44fcd | 270 | ACPI_FUNCTION_ENTRY(); |
44f6c012 RM |
271 | |
272 | switch (op->common.aml_opcode) { | |
273 | case AML_SCOPE_OP: | |
274 | case AML_ELSE_OP: | |
275 | case AML_DEVICE_OP: | |
276 | case AML_THERMAL_ZONE_OP: | |
277 | case AML_INT_METHODCALL_OP: | |
278 | ||
4be44fcd | 279 | child = acpi_ps_get_arg(op, 0); |
44f6c012 RM |
280 | break; |
281 | ||
44f6c012 RM |
282 | case AML_BUFFER_OP: |
283 | case AML_PACKAGE_OP: | |
284 | case AML_METHOD_OP: | |
285 | case AML_IF_OP: | |
286 | case AML_WHILE_OP: | |
287 | case AML_FIELD_OP: | |
288 | ||
4be44fcd | 289 | child = acpi_ps_get_arg(op, 1); |
44f6c012 RM |
290 | break; |
291 | ||
44f6c012 RM |
292 | case AML_POWER_RES_OP: |
293 | case AML_INDEX_FIELD_OP: | |
294 | ||
4be44fcd | 295 | child = acpi_ps_get_arg(op, 2); |
44f6c012 RM |
296 | break; |
297 | ||
44f6c012 RM |
298 | case AML_PROCESSOR_OP: |
299 | case AML_BANK_FIELD_OP: | |
300 | ||
4be44fcd | 301 | child = acpi_ps_get_arg(op, 3); |
44f6c012 RM |
302 | break; |
303 | ||
44f6c012 RM |
304 | default: |
305 | /* All others have no children */ | |
306 | break; | |
307 | } | |
308 | ||
309 | return (child); | |
310 | } | |
311 | #endif | |
4be44fcd | 312 | #endif /* ACPI_FUTURE_USAGE */ |