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pstree.c
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1 /******************************************************************************
2  *
3  * Module Name: pstree - Parser op tree manipulation/traversal/search
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2012, Intel Corp.
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 "accommon.h"
46 #include "acparser.h"
47 #include "amlcode.h"
48 
49 #define _COMPONENT ACPI_PARSER
50 ACPI_MODULE_NAME("pstree")
51 
52 /* Local prototypes */
53 #ifdef ACPI_OBSOLETE_FUNCTIONS
54 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op);
55 #endif
56 
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  *
64  * RETURN: The argument (as an Op object). NULL if argument does not exist
65  *
66  * DESCRIPTION: Get the specified op's argument.
67  *
68  ******************************************************************************/
69 
71 {
72  union acpi_parse_object *arg = NULL;
73  const struct acpi_opcode_info *op_info;
74 
76 
77 /*
78  if (Op->Common.aml_opcode == AML_INT_CONNECTION_OP)
79  {
80  return (Op->Common.Value.Arg);
81  }
82 */
83  /* Get the info structure for this opcode */
84 
85  op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
86  if (op_info->class == AML_CLASS_UNKNOWN) {
87 
88  /* Invalid opcode or ASCII character */
89 
90  return (NULL);
91  }
92 
93  /* Check if this opcode requires argument sub-objects */
94 
95  if (!(op_info->flags & AML_HAS_ARGS)) {
96 
97  /* Has no linked argument objects */
98 
99  return (NULL);
100  }
101 
102  /* Get the requested argument object */
103 
104  arg = op->common.value.arg;
105  while (arg && argn) {
106  argn--;
107  arg = arg->common.next;
108  }
109 
110  return (arg);
111 }
112 
113 /*******************************************************************************
114  *
115  * FUNCTION: acpi_ps_append_arg
116  *
117  * PARAMETERS: op - Append an argument to this Op.
118  * arg - Argument Op to append
119  *
120  * RETURN: None.
121  *
122  * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
123  *
124  ******************************************************************************/
125 
126 void
128 {
129  union acpi_parse_object *prev_arg;
130  const struct acpi_opcode_info *op_info;
131 
133 
134  if (!op) {
135  return;
136  }
137 
138  /* Get the info structure for this opcode */
139 
140  op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
141  if (op_info->class == AML_CLASS_UNKNOWN) {
142 
143  /* Invalid opcode */
144 
145  ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
146  op->common.aml_opcode));
147  return;
148  }
149 
150  /* Check if this opcode requires argument sub-objects */
151 
152  if (!(op_info->flags & AML_HAS_ARGS)) {
153 
154  /* Has no linked argument objects */
155 
156  return;
157  }
158 
159  /* Append the argument to the linked argument list */
160 
161  if (op->common.value.arg) {
162 
163  /* Append to existing argument list */
164 
165  prev_arg = op->common.value.arg;
166  while (prev_arg->common.next) {
167  prev_arg = prev_arg->common.next;
168  }
169  prev_arg->common.next = arg;
170  } else {
171  /* No argument list, this will be the first argument */
172 
173  op->common.value.arg = arg;
174  }
175 
176  /* Set the parent in this arg and any args linked after it */
177 
178  while (arg) {
179  arg->common.parent = op;
180  arg = arg->common.next;
181 
182  op->common.arg_list_length++;
183  }
184 }
185 
186 #ifdef ACPI_FUTURE_USAGE
187 /*******************************************************************************
188  *
189  * FUNCTION: acpi_ps_get_depth_next
190  *
191  * PARAMETERS: origin - Root of subtree to search
192  * op - Last (previous) Op that was found
193  *
194  * RETURN: Next Op found in the search.
195  *
196  * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
197  * Return NULL when reaching "origin" or when walking up from root
198  *
199  ******************************************************************************/
200 
201 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
202  union acpi_parse_object *op)
203 {
204  union acpi_parse_object *next = NULL;
205  union acpi_parse_object *parent;
206  union acpi_parse_object *arg;
207 
209 
210  if (!op) {
211  return (NULL);
212  }
213 
214  /* Look for an argument or child */
215 
216  next = acpi_ps_get_arg(op, 0);
217  if (next) {
218  return (next);
219  }
220 
221  /* Look for a sibling */
222 
223  next = op->common.next;
224  if (next) {
225  return (next);
226  }
227 
228  /* Look for a sibling of parent */
229 
230  parent = op->common.parent;
231 
232  while (parent) {
233  arg = acpi_ps_get_arg(parent, 0);
234  while (arg && (arg != origin) && (arg != op)) {
235  arg = arg->common.next;
236  }
237 
238  if (arg == origin) {
239 
240  /* Reached parent of origin, end search */
241 
242  return (NULL);
243  }
244 
245  if (parent->common.next) {
246 
247  /* Found sibling of parent */
248 
249  return (parent->common.next);
250  }
251 
252  op = parent;
253  parent = parent->common.parent;
254  }
255 
256  return (next);
257 }
258 
259 #ifdef ACPI_OBSOLETE_FUNCTIONS
260 /*******************************************************************************
261  *
262  * FUNCTION: acpi_ps_get_child
263  *
264  * PARAMETERS: op - Get the child of this Op
265  *
266  * RETURN: Child Op, Null if none is found.
267  *
268  * DESCRIPTION: Get op's children or NULL if none
269  *
270  ******************************************************************************/
271 
272 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
273 {
274  union acpi_parse_object *child = NULL;
275 
277 
278  switch (op->common.aml_opcode) {
279  case AML_SCOPE_OP:
280  case AML_ELSE_OP:
281  case AML_DEVICE_OP:
282  case AML_THERMAL_ZONE_OP:
284 
285  child = acpi_ps_get_arg(op, 0);
286  break;
287 
288  case AML_BUFFER_OP:
289  case AML_PACKAGE_OP:
290  case AML_METHOD_OP:
291  case AML_IF_OP:
292  case AML_WHILE_OP:
293  case AML_FIELD_OP:
294 
295  child = acpi_ps_get_arg(op, 1);
296  break;
297 
298  case AML_POWER_RES_OP:
299  case AML_INDEX_FIELD_OP:
300 
301  child = acpi_ps_get_arg(op, 2);
302  break;
303 
304  case AML_PROCESSOR_OP:
305  case AML_BANK_FIELD_OP:
306 
307  child = acpi_ps_get_arg(op, 3);
308  break;
309 
310  default:
311  /* All others have no children */
312  break;
313  }
314 
315  return (child);
316 }
317 #endif
318 #endif /* ACPI_FUTURE_USAGE */