1 /******************************************************************************
2 *
3 * Module Name: pstree - Parser op tree manipulation/traversal/search
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2007, 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 #include <acpi/acpi.h>
45 #include <acpi/acparser.h>
46 #include <acpi/amlcode.h>
47
48 #define _COMPONENT ACPI_PARSER
49 ACPI_MODULE_NAME("pstree")
50
51 /* Local prototypes */
52 #ifdef ACPI_OBSOLETE_FUNCTIONS
53 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op);
54 #endif
55
56 /*******************************************************************************
57 *
58 * FUNCTION: acpi_ps_get_arg
59 *
60 * PARAMETERS: Op - Get an argument for this op
61 * Argn - Nth argument to get
62 *
63 * RETURN: The argument (as an Op object). NULL if argument does not exist
64 *
65 * DESCRIPTION: Get the specified op's argument.
66 *
67 ******************************************************************************/
68
69 union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn)
70 {
71 union acpi_parse_object *arg = NULL;
72 const struct acpi_opcode_info *op_info;
73
74 ACPI_FUNCTION_ENTRY();
75
76 /* Get the info structure for this opcode */
77
78 op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
79 if (op_info->class == AML_CLASS_UNKNOWN) {
80
81 /* Invalid opcode or ASCII character */
82
83 return (NULL);
84 }
85
86 /* Check if this opcode requires argument sub-objects */
87
88 if (!(op_info->flags & AML_HAS_ARGS)) {
89
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 * FUNCTION: acpi_ps_append_arg
109 *
110 * PARAMETERS: Op - Append an argument to this Op.
111 * Arg - Argument Op to append
112 *
113 * RETURN: None.
114 *
115 * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
116 *
117 ******************************************************************************/
118
119 void
120 acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
121 {
122 union acpi_parse_object *prev_arg;
123 const struct acpi_opcode_info *op_info;
124
125 ACPI_FUNCTION_ENTRY();
126
127 if (!op) {
128 return;
129 }
130
131 /* Get the info structure for this opcode */
132
133 op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
134 if (op_info->class == AML_CLASS_UNKNOWN) {
135
136 /* Invalid opcode */
137
138 ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
139 op->common.aml_opcode));
140 return;
141 }
142
143 /* Check if this opcode requires argument sub-objects */
144
145 if (!(op_info->flags & AML_HAS_ARGS)) {
146
147 /* Has no linked argument objects */
148
149 return;
150 }
151
152 /* Append the argument to the linked argument list */
153
154 if (op->common.value.arg) {
155
156 /* Append to existing argument list */
157
158 prev_arg = op->common.value.arg;
159 while (prev_arg->common.next) {
160 prev_arg = prev_arg->common.next;
161 }
162 prev_arg->common.next = arg;
163 } else {
164 /* No argument list, this will be the first argument */
165
166 op->common.value.arg = arg;
167 }
168
169 /* Set the parent in this arg and any args linked after it */
170
171 while (arg) {
172 arg->common.parent = op;
173 arg = arg->common.next;
174 }
175 }
176
177 #ifdef ACPI_FUTURE_USAGE
178 /*******************************************************************************
179 *
180 * FUNCTION: acpi_ps_get_depth_next
181 *
182 * PARAMETERS: Origin - Root of subtree to search
183 * Op - Last (previous) Op that was found
184 *
185 * RETURN: Next Op found in the search.
186 *
187 * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
188 * Return NULL when reaching "origin" or when walking up from root
189 *
190 ******************************************************************************/
191
192 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
193 union acpi_parse_object *op)
194 {
195 union acpi_parse_object *next = NULL;
196 union acpi_parse_object *parent;
197 union acpi_parse_object *arg;
198
199 ACPI_FUNCTION_ENTRY();
200
201 if (!op) {
202 return (NULL);
203 }
204
205 /* Look for an argument or child */
206
207 next = acpi_ps_get_arg(op, 0);
208 if (next) {
209 return (next);
210 }
211
212 /* Look for a sibling */
213
214 next = op->common.next;
215 if (next) {
216 return (next);
217 }
218
219 /* Look for a sibling of parent */
220
221 parent = op->common.parent;
222
223 while (parent) {
224 arg = acpi_ps_get_arg(parent, 0);
225 while (arg && (arg != origin) && (arg != op)) {
226 arg = arg->common.next;
227 }
228
229 if (arg == origin) {
230
231 /* Reached parent of origin, end search */
232
233 return (NULL);
234 }
235
236 if (parent->common.next) {
237
238 /* Found sibling of parent */
239
240 return (parent->common.next);
241 }
242
243 op = parent;
244 parent = parent->common.parent;
245 }
246
247 return (next);
248 }
249
250 #ifdef ACPI_OBSOLETE_FUNCTIONS
251 /*******************************************************************************
252 *
253 * FUNCTION: acpi_ps_get_child
254 *
255 * PARAMETERS: Op - Get the child of this Op
256 *
257 * RETURN: Child Op, Null if none is found.
258 *
259 * DESCRIPTION: Get op's children or NULL if none
260 *
261 ******************************************************************************/
262
263 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
264 {
265 union acpi_parse_object *child = NULL;
266
267 ACPI_FUNCTION_ENTRY();
268
269 switch (op->common.aml_opcode) {
270 case AML_SCOPE_OP:
271 case AML_ELSE_OP:
272 case AML_DEVICE_OP:
273 case AML_THERMAL_ZONE_OP:
274 case AML_INT_METHODCALL_OP:
275
276 child = acpi_ps_get_arg(op, 0);
277 break;
278
279 case AML_BUFFER_OP:
280 case AML_PACKAGE_OP:
281 case AML_METHOD_OP:
282 case AML_IF_OP:
283 case AML_WHILE_OP:
284 case AML_FIELD_OP:
285
286 child = acpi_ps_get_arg(op, 1);
287 break;
288
289 case AML_POWER_RES_OP:
290 case AML_INDEX_FIELD_OP:
291
292 child = acpi_ps_get_arg(op, 2);
293 break;
294
295 case AML_PROCESSOR_OP:
296 case AML_BANK_FIELD_OP:
297
298 child = acpi_ps_get_arg(op, 3);
299 break;
300
301 default:
302 /* All others have no children */
303 break;
304 }
305
306 return (child);
307 }
308 #endif
309 #endif /* ACPI_FUTURE_USAGE */
310
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