1 /******************************************************************************
3 * Module Name: pstree - Parser op tree manipulation/traversal/search
5 *****************************************************************************/
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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();
78 if (Op->Common.aml_opcode == AML_INT_CONNECTION_OP)
80 return (Op->Common.Value.Arg);
83 /* Get the info structure for this opcode */
85 op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
86 if (op_info->class == AML_CLASS_UNKNOWN) {
88 /* Invalid opcode or ASCII character */
93 /* Check if this opcode requires argument sub-objects */
95 if (!(op_info->flags & AML_HAS_ARGS)) {
97 /* Has no linked argument objects */
102 /* Get the requested argument object */
104 arg = op->common.value.arg;
105 while (arg && argn) {
107 arg = arg->common.next;
113 /*******************************************************************************
115 * FUNCTION: acpi_ps_append_arg
117 * PARAMETERS: op - Append an argument to this Op.
118 * arg - Argument Op to append
122 * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
124 ******************************************************************************/
127 acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
129 union acpi_parse_object *prev_arg;
130 const struct acpi_opcode_info *op_info;
132 ACPI_FUNCTION_TRACE(ps_append_arg);
138 /* Get the info structure for this opcode */
140 op_info = acpi_ps_get_opcode_info(op->common.aml_opcode);
141 if (op_info->class == AML_CLASS_UNKNOWN) {
145 ACPI_ERROR((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
146 op->common.aml_opcode));
150 /* Check if this opcode requires argument sub-objects */
152 if (!(op_info->flags & AML_HAS_ARGS)) {
154 /* Has no linked argument objects */
159 /* Append the argument to the linked argument list */
161 if (op->common.value.arg) {
163 /* Append to existing argument list */
165 prev_arg = op->common.value.arg;
166 while (prev_arg->common.next) {
167 prev_arg = prev_arg->common.next;
169 prev_arg->common.next = arg;
171 /* No argument list, this will be the first argument */
173 op->common.value.arg = arg;
176 /* Set the parent in this arg and any args linked after it */
179 arg->common.parent = op;
180 arg = arg->common.next;
182 op->common.arg_list_length++;
188 /*******************************************************************************
190 * FUNCTION: acpi_ps_get_depth_next
192 * PARAMETERS: origin - Root of subtree to search
193 * op - Last (previous) Op that was found
195 * RETURN: Next Op found in the search.
197 * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
198 * Return NULL when reaching "origin" or when walking up from root
200 ******************************************************************************/
202 union acpi_parse_object *acpi_ps_get_depth_next(union acpi_parse_object *origin,
203 union acpi_parse_object *op)
205 union acpi_parse_object *next = NULL;
206 union acpi_parse_object *parent;
207 union acpi_parse_object *arg;
209 ACPI_FUNCTION_ENTRY();
215 /* Look for an argument or child */
217 next = acpi_ps_get_arg(op, 0);
222 /* Look for a sibling */
224 next = op->common.next;
229 /* Look for a sibling of parent */
231 parent = op->common.parent;
234 arg = acpi_ps_get_arg(parent, 0);
235 while (arg && (arg != origin) && (arg != op)) {
236 arg = arg->common.next;
241 /* Reached parent of origin, end search */
246 if (parent->common.next) {
248 /* Found sibling of parent */
250 return (parent->common.next);
254 parent = parent->common.parent;
260 #ifdef ACPI_OBSOLETE_FUNCTIONS
261 /*******************************************************************************
263 * FUNCTION: acpi_ps_get_child
265 * PARAMETERS: op - Get the child of this Op
267 * RETURN: Child Op, Null if none is found.
269 * DESCRIPTION: Get op's children or NULL if none
271 ******************************************************************************/
273 union acpi_parse_object *acpi_ps_get_child(union acpi_parse_object *op)
275 union acpi_parse_object *child = NULL;
277 ACPI_FUNCTION_ENTRY();
279 switch (op->common.aml_opcode) {
283 case AML_THERMAL_ZONE_OP:
284 case AML_INT_METHODCALL_OP:
286 child = acpi_ps_get_arg(op, 0);
296 child = acpi_ps_get_arg(op, 1);
299 case AML_POWER_RES_OP:
300 case AML_INDEX_FIELD_OP:
302 child = acpi_ps_get_arg(op, 2);
305 case AML_PROCESSOR_OP:
306 case AML_BANK_FIELD_OP:
308 child = acpi_ps_get_arg(op, 3);
313 /* All others have no children */