1 /******************************************************************************
2 *
3 * Module Name: pstree - Parser op tree manipulation/traversal/search
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 #include <acpi/amlcode.h>
48
49 #define _COMPONENT ACPI_PARSER
50 ACPI_MODULE_NAME ("pstree")
51
52
53 /*******************************************************************************
54 *
55 * FUNCTION: acpi_ps_get_arg
56 *
57 * PARAMETERS: Op - Get an argument for this op
58 * Argn - Nth argument to get
59 *
60 * RETURN: The argument (as an Op object). NULL if argument does not exist
61 *
62 * DESCRIPTION: Get the specified op's argument.
63 *
64 ******************************************************************************/
65
66 union acpi_parse_object *
67 acpi_ps_get_arg (
68 union acpi_parse_object *op,
69 u32 argn)
70 {
71 union acpi_parse_object *arg = NULL;
72 const struct acpi_opcode_info *op_info;
73
74
75 ACPI_FUNCTION_ENTRY ();
76
77
78 /* Get the info structure for this opcode */
79
80 op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
81 if (op_info->class == AML_CLASS_UNKNOWN) {
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)) {
90 /* Has no linked argument objects */
91
92 return (NULL);
93 }
94
95 /* Get the requested argument object */
96
97 arg = op->common.value.arg;
98 while (arg && argn) {
99 argn--;
100 arg = arg->common.next;
101 }
102
103 return (arg);
104 }
105
106
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
121 acpi_ps_append_arg (
122 union acpi_parse_object *op,
123 union acpi_parse_object *arg)
124 {
125 union acpi_parse_object *prev_arg;
126 const struct acpi_opcode_info *op_info;
127
128
129 ACPI_FUNCTION_ENTRY ();
130
131
132 if (!op) {
133 return;
134 }
135
136 /* Get the info structure for this opcode */
137
138 op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
139 if (op_info->class == AML_CLASS_UNKNOWN) {
140 /* Invalid opcode */
141
142 ACPI_REPORT_ERROR (("ps_append_arg: Invalid AML Opcode: 0x%2.2X\n",
143 op->common.aml_opcode));
144 return;
145 }
146
147 /* Check if this opcode requires argument sub-objects */
148
149 if (!(op_info->flags & AML_HAS_ARGS)) {
150 /* Has no linked argument objects */
151
152 return;
153 }
154
155
156 /* Append the argument to the linked argument list */
157
158 if (op->common.value.arg) {
159 /* Append to existing argument list */
160
161 prev_arg = op->common.value.arg;
162 while (prev_arg->common.next) {
163 prev_arg = prev_arg->common.next;
164 }
165 prev_arg->common.next = arg;
166 }
167
168 else {
169 /* No argument list, this will be the first argument */
170
171 op->common.value.arg = arg;
172 }
173
174
175 /* Set the parent in this arg and any args linked after it */
176
177 while (arg) {
178 arg->common.parent = op;
179 arg = arg->common.next;
180 }
181 }
182
183
184 #ifdef ACPI_FUTURE_USAGE
185
186 /*******************************************************************************
187 *
188 * FUNCTION: acpi_ps_get_child
189 *
190 * PARAMETERS: Op - Get the child of this Op
191 *
192 * RETURN: Child Op, Null if none is found.
193 *
194 * DESCRIPTION: Get op's children or NULL if none
195 *
196 ******************************************************************************/
197 union acpi_parse_object *
198 acpi_ps_get_child (
199 union acpi_parse_object *op)
200 {
201 union acpi_parse_object *child = NULL;
202
203
204 ACPI_FUNCTION_ENTRY ();
205
206
207 switch (op->common.aml_opcode) {
208 case AML_SCOPE_OP:
209 case AML_ELSE_OP:
210 case AML_DEVICE_OP:
211 case AML_THERMAL_ZONE_OP:
212 case AML_INT_METHODCALL_OP:
213
214 child = acpi_ps_get_arg (op, 0);
215 break;
216
217
218 case AML_BUFFER_OP:
219 case AML_PACKAGE_OP:
220 case AML_METHOD_OP:
221 case AML_IF_OP:
222 case AML_WHILE_OP:
223 case AML_FIELD_OP:
224
225 child = acpi_ps_get_arg (op, 1);
226 break;
227
228
229 case AML_POWER_RES_OP:
230 case AML_INDEX_FIELD_OP:
231
232 child = acpi_ps_get_arg (op, 2);
233 break;
234
235
236 case AML_PROCESSOR_OP:
237 case AML_BANK_FIELD_OP:
238
239 child = acpi_ps_get_arg (op, 3);
240 break;
241
242
243 default:
244 /* All others have no children */
245 break;
246 }
247
248 return (child);
249 }
250
251
252 /*******************************************************************************
253 *
254 * FUNCTION: acpi_ps_get_depth_next
255 *
256 * PARAMETERS: Origin - Root of subtree to search
257 * Op - Last (previous) Op that was found
258 *
259 * RETURN: Next Op found in the search.
260 *
261 * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
262 * Return NULL when reaching "origin" or when walking up from root
263 *
264 ******************************************************************************/
265
266 union acpi_parse_object *
267 acpi_ps_get_depth_next (
268 union acpi_parse_object *origin,
269 union acpi_parse_object *op)
270 {
271 union acpi_parse_object *next = NULL;
272 union acpi_parse_object *parent;
273 union acpi_parse_object *arg;
274
275
276 ACPI_FUNCTION_ENTRY ();
277
278
279 if (!op) {
280 return (NULL);
281 }
282
283 /* look for an argument or child */
284
285 next = acpi_ps_get_arg (op, 0);
286 if (next) {
287 return (next);
288 }
289
290 /* look for a sibling */
291
292 next = op->common.next;
293 if (next) {
294 return (next);
295 }
296
297 /* look for a sibling of parent */
298
299 parent = op->common.parent;
300
301 while (parent) {
302 arg = acpi_ps_get_arg (parent, 0);
303 while (arg && (arg != origin) && (arg != op)) {
304 arg = arg->common.next;
305 }
306
307 if (arg == origin) {
308 /* reached parent of origin, end search */
309
310 return (NULL);
311 }
312
313 if (parent->common.next) {
314 /* found sibling of parent */
315
316 return (parent->common.next);
317 }
318
319 op = parent;
320 parent = parent->common.parent;
321 }
322
323 return (next);
324 }
325
326 #endif /* ACPI_FUTURE_USAGE */
327
328
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