1 /******************************************************************************
3 * Module Name: pstree - Parser op tree manipulation/traversal/search
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2005, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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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>
45 #include <acpi/acparser.h>
46 #include <acpi/amlcode.h>
48 #define _COMPONENT ACPI_PARSER
49 ACPI_MODULE_NAME("pstree")
51 /* Local prototypes */
52 #ifdef ACPI_OBSOLETE_FUNCTIONS
53 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op);
56 /*******************************************************************************
58 * FUNCTION: acpi_ps_get_arg
60 * PARAMETERS: Op - Get an argument for this op
61 * Argn - Nth argument to get
63 * RETURN: The argument (as an Op object). NULL if argument does not exist
65 * DESCRIPTION: Get the specified op's argument.
67 ******************************************************************************/
69 union acpi_parse_object *acpi_ps_get_arg(union acpi_parse_object *op, u32 argn)
71 union acpi_parse_object *arg = NULL;
72 const struct acpi_opcode_info *op_info;
74 ACPI_FUNCTION_ENTRY();
76 /* Get the info structure for this opcode */
78 op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
79 if (op_info->class == AML_CLASS_UNKNOWN) {
80 /* Invalid opcode or ASCII character */
85 /* Check if this opcode requires argument sub-objects */
87 if (!(op_info->flags & AML_HAS_ARGS)) {
88 /* Has no linked argument objects */
93 /* Get the requested argument object */
95 arg = op->common.value.arg;
98 arg = arg->common.next;
104 /*******************************************************************************
106 * FUNCTION: acpi_ps_append_arg
108 * PARAMETERS: Op - Append an argument to this Op.
109 * Arg - Argument Op to append
113 * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
115 ******************************************************************************/
118 acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
120 union acpi_parse_object *prev_arg;
121 const struct acpi_opcode_info *op_info;
123 ACPI_FUNCTION_ENTRY();
129 /* Get the info structure for this opcode */
131 op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
132 if (op_info->class == AML_CLASS_UNKNOWN) {
135 ACPI_REPORT_ERROR(("ps_append_arg: Invalid AML Opcode: 0x%2.2X\n", op->common.aml_opcode));
139 /* Check if this opcode requires argument sub-objects */
141 if (!(op_info->flags & AML_HAS_ARGS)) {
142 /* Has no linked argument objects */
147 /* Append the argument to the linked argument list */
149 if (op->common.value.arg) {
150 /* Append to existing argument list */
152 prev_arg = op->common.value.arg;
153 while (prev_arg->common.next) {
154 prev_arg = prev_arg->common.next;
156 prev_arg->common.next = arg;
158 /* No argument list, this will be the first argument */
160 op->common.value.arg = arg;
163 /* Set the parent in this arg and any args linked after it */
166 arg->common.parent = op;
167 arg = arg->common.next;
171 #ifdef ACPI_FUTURE_USAGE
172 /*******************************************************************************
174 * FUNCTION: acpi_ps_get_depth_next
176 * PARAMETERS: Origin - Root of subtree to search
177 * Op - Last (previous) Op that was found
179 * RETURN: Next Op found in the search.
181 * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
182 * Return NULL when reaching "origin" or when walking up from root
184 ******************************************************************************/
186 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
187 union acpi_parse_object *op)
189 union acpi_parse_object *next = NULL;
190 union acpi_parse_object *parent;
191 union acpi_parse_object *arg;
193 ACPI_FUNCTION_ENTRY();
199 /* Look for an argument or child */
201 next = acpi_ps_get_arg(op, 0);
206 /* Look for a sibling */
208 next = op->common.next;
213 /* Look for a sibling of parent */
215 parent = op->common.parent;
218 arg = acpi_ps_get_arg(parent, 0);
219 while (arg && (arg != origin) && (arg != op)) {
220 arg = arg->common.next;
224 /* Reached parent of origin, end search */
229 if (parent->common.next) {
230 /* Found sibling of parent */
232 return (parent->common.next);
236 parent = parent->common.parent;
242 #ifdef ACPI_OBSOLETE_FUNCTIONS
243 /*******************************************************************************
245 * FUNCTION: acpi_ps_get_child
247 * PARAMETERS: Op - Get the child of this Op
249 * RETURN: Child Op, Null if none is found.
251 * DESCRIPTION: Get op's children or NULL if none
253 ******************************************************************************/
255 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
257 union acpi_parse_object *child = NULL;
259 ACPI_FUNCTION_ENTRY();
261 switch (op->common.aml_opcode) {
265 case AML_THERMAL_ZONE_OP:
266 case AML_INT_METHODCALL_OP:
268 child = acpi_ps_get_arg(op, 0);
278 child = acpi_ps_get_arg(op, 1);
281 case AML_POWER_RES_OP:
282 case AML_INDEX_FIELD_OP:
284 child = acpi_ps_get_arg(op, 2);
287 case AML_PROCESSOR_OP:
288 case AML_BANK_FIELD_OP:
290 child = acpi_ps_get_arg(op, 3);
294 /* All others have no children */
302 #endif /* ACPI_FUTURE_USAGE */