1 /******************************************************************************
3 * Module Name: pstree - Parser op tree manipulation/traversal/search
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
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12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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
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44 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_PARSER
50 ACPI_MODULE_NAME("pstree")
52 /* Local prototypes */
53 #ifdef ACPI_OBSOLETE_FUNCTIONS
54 union acpi_parse_object
*acpi_ps_get_child(union acpi_parse_object
*op
);
57 /*******************************************************************************
59 * FUNCTION: acpi_ps_get_arg
61 * PARAMETERS: Op - Get an argument for this op
62 * Argn - Nth argument to get
64 * RETURN: The argument (as an Op object). NULL if argument does not exist
66 * DESCRIPTION: Get the specified op's argument.
68 ******************************************************************************/
70 union acpi_parse_object
*acpi_ps_get_arg(union acpi_parse_object
*op
, u32 argn
)
72 union acpi_parse_object
*arg
= NULL
;
73 const struct acpi_opcode_info
*op_info
;
75 ACPI_FUNCTION_ENTRY();
77 /* Get the info structure for this opcode */
79 op_info
= acpi_ps_get_opcode_info(op
->common
.aml_opcode
);
80 if (op_info
->class == AML_CLASS_UNKNOWN
) {
82 /* Invalid opcode or ASCII character */
87 /* Check if this opcode requires argument sub-objects */
89 if (!(op_info
->flags
& AML_HAS_ARGS
)) {
91 /* Has no linked argument objects */
96 /* Get the requested argument object */
98 arg
= op
->common
.value
.arg
;
101 arg
= arg
->common
.next
;
107 /*******************************************************************************
109 * FUNCTION: acpi_ps_append_arg
111 * PARAMETERS: Op - Append an argument to this Op.
112 * Arg - Argument Op to append
116 * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
118 ******************************************************************************/
121 acpi_ps_append_arg(union acpi_parse_object
*op
, union acpi_parse_object
*arg
)
123 union acpi_parse_object
*prev_arg
;
124 const struct acpi_opcode_info
*op_info
;
126 ACPI_FUNCTION_ENTRY();
132 /* Get the info structure for this opcode */
134 op_info
= acpi_ps_get_opcode_info(op
->common
.aml_opcode
);
135 if (op_info
->class == AML_CLASS_UNKNOWN
) {
139 ACPI_ERROR((AE_INFO
, "Invalid AML Opcode: 0x%2.2X",
140 op
->common
.aml_opcode
));
144 /* Check if this opcode requires argument sub-objects */
146 if (!(op_info
->flags
& AML_HAS_ARGS
)) {
148 /* Has no linked argument objects */
153 /* Append the argument to the linked argument list */
155 if (op
->common
.value
.arg
) {
157 /* Append to existing argument list */
159 prev_arg
= op
->common
.value
.arg
;
160 while (prev_arg
->common
.next
) {
161 prev_arg
= prev_arg
->common
.next
;
163 prev_arg
->common
.next
= arg
;
165 /* No argument list, this will be the first argument */
167 op
->common
.value
.arg
= arg
;
170 /* Set the parent in this arg and any args linked after it */
173 arg
->common
.parent
= op
;
174 arg
= arg
->common
.next
;
176 op
->common
.arg_list_length
++;
180 #ifdef ACPI_FUTURE_USAGE
181 /*******************************************************************************
183 * FUNCTION: acpi_ps_get_depth_next
185 * PARAMETERS: Origin - Root of subtree to search
186 * Op - Last (previous) Op that was found
188 * RETURN: Next Op found in the search.
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
193 ******************************************************************************/
195 union acpi_parse_object
*acpi_ps_get_depth_next(union acpi_parse_object
*origin
,
196 union acpi_parse_object
*op
)
198 union acpi_parse_object
*next
= NULL
;
199 union acpi_parse_object
*parent
;
200 union acpi_parse_object
*arg
;
202 ACPI_FUNCTION_ENTRY();
208 /* Look for an argument or child */
210 next
= acpi_ps_get_arg(op
, 0);
215 /* Look for a sibling */
217 next
= op
->common
.next
;
222 /* Look for a sibling of parent */
224 parent
= op
->common
.parent
;
227 arg
= acpi_ps_get_arg(parent
, 0);
228 while (arg
&& (arg
!= origin
) && (arg
!= op
)) {
229 arg
= arg
->common
.next
;
234 /* Reached parent of origin, end search */
239 if (parent
->common
.next
) {
241 /* Found sibling of parent */
243 return (parent
->common
.next
);
247 parent
= parent
->common
.parent
;
253 #ifdef ACPI_OBSOLETE_FUNCTIONS
254 /*******************************************************************************
256 * FUNCTION: acpi_ps_get_child
258 * PARAMETERS: Op - Get the child of this Op
260 * RETURN: Child Op, Null if none is found.
262 * DESCRIPTION: Get op's children or NULL if none
264 ******************************************************************************/
266 union acpi_parse_object
*acpi_ps_get_child(union acpi_parse_object
*op
)
268 union acpi_parse_object
*child
= NULL
;
270 ACPI_FUNCTION_ENTRY();
272 switch (op
->common
.aml_opcode
) {
276 case AML_THERMAL_ZONE_OP
:
277 case AML_INT_METHODCALL_OP
:
279 child
= acpi_ps_get_arg(op
, 0);
289 child
= acpi_ps_get_arg(op
, 1);
292 case AML_POWER_RES_OP
:
293 case AML_INDEX_FIELD_OP
:
295 child
= acpi_ps_get_arg(op
, 2);
298 case AML_PROCESSOR_OP
:
299 case AML_BANK_FIELD_OP
:
301 child
= acpi_ps_get_arg(op
, 3);
305 /* All others have no children */
312 #endif /* ACPI_FUTURE_USAGE */
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