1 /******************************************************************************
2 *
3 * Module Name: dswexec - Dispatcher method execution callbacks;
4 * dispatch to interpreter.
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2016, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acparser.h"
48 #include "amlcode.h"
49 #include "acdispat.h"
50 #include "acinterp.h"
51 #include "acnamesp.h"
52 #include "acdebug.h"
53
54 #define _COMPONENT ACPI_DISPATCHER
55 ACPI_MODULE_NAME("dswexec")
56
57 /*
58 * Dispatch table for opcode classes
59 */
60 static acpi_execute_op acpi_gbl_op_type_dispatch[] = {
61 acpi_ex_opcode_0A_0T_1R,
62 acpi_ex_opcode_1A_0T_0R,
63 acpi_ex_opcode_1A_0T_1R,
64 acpi_ex_opcode_1A_1T_0R,
65 acpi_ex_opcode_1A_1T_1R,
66 acpi_ex_opcode_2A_0T_0R,
67 acpi_ex_opcode_2A_0T_1R,
68 acpi_ex_opcode_2A_1T_1R,
69 acpi_ex_opcode_2A_2T_1R,
70 acpi_ex_opcode_3A_0T_0R,
71 acpi_ex_opcode_3A_1T_1R,
72 acpi_ex_opcode_6A_0T_1R
73 };
74
75 /*****************************************************************************
76 *
77 * FUNCTION: acpi_ds_get_predicate_value
78 *
79 * PARAMETERS: walk_state - Current state of the parse tree walk
80 * result_obj - if non-zero, pop result from result stack
81 *
82 * RETURN: Status
83 *
84 * DESCRIPTION: Get the result of a predicate evaluation
85 *
86 ****************************************************************************/
87
88 acpi_status
acpi_ds_get_predicate_value(struct acpi_walk_state * walk_state,union acpi_operand_object * result_obj)89 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
90 union acpi_operand_object *result_obj)
91 {
92 acpi_status status = AE_OK;
93 union acpi_operand_object *obj_desc;
94 union acpi_operand_object *local_obj_desc = NULL;
95
96 ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
97
98 walk_state->control_state->common.state = 0;
99
100 if (result_obj) {
101 status = acpi_ds_result_pop(&obj_desc, walk_state);
102 if (ACPI_FAILURE(status)) {
103 ACPI_EXCEPTION((AE_INFO, status,
104 "Could not get result from predicate evaluation"));
105
106 return_ACPI_STATUS(status);
107 }
108 } else {
109 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
110 if (ACPI_FAILURE(status)) {
111 return_ACPI_STATUS(status);
112 }
113
114 status =
115 acpi_ex_resolve_to_value(&walk_state->operands[0],
116 walk_state);
117 if (ACPI_FAILURE(status)) {
118 return_ACPI_STATUS(status);
119 }
120
121 obj_desc = walk_state->operands[0];
122 }
123
124 if (!obj_desc) {
125 ACPI_ERROR((AE_INFO,
126 "No predicate ObjDesc=%p State=%p",
127 obj_desc, walk_state));
128
129 return_ACPI_STATUS(AE_AML_NO_OPERAND);
130 }
131
132 /*
133 * Result of predicate evaluation must be an Integer
134 * object. Implicitly convert the argument if necessary.
135 */
136 status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc,
137 ACPI_STRTOUL_BASE16);
138 if (ACPI_FAILURE(status)) {
139 goto cleanup;
140 }
141
142 if (local_obj_desc->common.type != ACPI_TYPE_INTEGER) {
143 ACPI_ERROR((AE_INFO,
144 "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
145 obj_desc, walk_state, obj_desc->common.type));
146
147 status = AE_AML_OPERAND_TYPE;
148 goto cleanup;
149 }
150
151 /* Truncate the predicate to 32-bits if necessary */
152
153 (void)acpi_ex_truncate_for32bit_table(local_obj_desc);
154
155 /*
156 * Save the result of the predicate evaluation on
157 * the control stack
158 */
159 if (local_obj_desc->integer.value) {
160 walk_state->control_state->common.value = TRUE;
161 } else {
162 /*
163 * Predicate is FALSE, we will just toss the
164 * rest of the package
165 */
166 walk_state->control_state->common.value = FALSE;
167 status = AE_CTRL_FALSE;
168 }
169
170 /* Predicate can be used for an implicit return value */
171
172 (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
173
174 cleanup:
175
176 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
177 "Completed a predicate eval=%X Op=%p\n",
178 walk_state->control_state->common.value,
179 walk_state->op));
180
181 /* Break to debugger to display result */
182
183 acpi_db_display_result_object(local_obj_desc, walk_state);
184
185 /*
186 * Delete the predicate result object (we know that
187 * we don't need it anymore)
188 */
189 if (local_obj_desc != obj_desc) {
190 acpi_ut_remove_reference(local_obj_desc);
191 }
192 acpi_ut_remove_reference(obj_desc);
193
194 walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
195 return_ACPI_STATUS(status);
196 }
197
198 /*****************************************************************************
199 *
200 * FUNCTION: acpi_ds_exec_begin_op
201 *
202 * PARAMETERS: walk_state - Current state of the parse tree walk
203 * out_op - Where to return op if a new one is created
204 *
205 * RETURN: Status
206 *
207 * DESCRIPTION: Descending callback used during the execution of control
208 * methods. This is where most operators and operands are
209 * dispatched to the interpreter.
210 *
211 ****************************************************************************/
212
213 acpi_status
acpi_ds_exec_begin_op(struct acpi_walk_state * walk_state,union acpi_parse_object ** out_op)214 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
215 union acpi_parse_object **out_op)
216 {
217 union acpi_parse_object *op;
218 acpi_status status = AE_OK;
219 u32 opcode_class;
220
221 ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
222
223 op = walk_state->op;
224 if (!op) {
225 status = acpi_ds_load2_begin_op(walk_state, out_op);
226 if (ACPI_FAILURE(status)) {
227 goto error_exit;
228 }
229
230 op = *out_op;
231 walk_state->op = op;
232 walk_state->opcode = op->common.aml_opcode;
233 walk_state->op_info =
234 acpi_ps_get_opcode_info(op->common.aml_opcode);
235
236 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
237 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
238 "(%s) Popping scope for Op %p\n",
239 acpi_ut_get_type_name(walk_state->
240 op_info->
241 object_type),
242 op));
243
244 status = acpi_ds_scope_stack_pop(walk_state);
245 if (ACPI_FAILURE(status)) {
246 goto error_exit;
247 }
248 }
249 }
250
251 if (op == walk_state->origin) {
252 if (out_op) {
253 *out_op = op;
254 }
255
256 return_ACPI_STATUS(AE_OK);
257 }
258
259 /*
260 * If the previous opcode was a conditional, this opcode
261 * must be the beginning of the associated predicate.
262 * Save this knowledge in the current scope descriptor
263 */
264 if ((walk_state->control_state) &&
265 (walk_state->control_state->common.state ==
266 ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
267 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
268 "Exec predicate Op=%p State=%p\n",
269 op, walk_state));
270
271 walk_state->control_state->common.state =
272 ACPI_CONTROL_PREDICATE_EXECUTING;
273
274 /* Save start of predicate */
275
276 walk_state->control_state->control.predicate_op = op;
277 }
278
279 opcode_class = walk_state->op_info->class;
280
281 /* We want to send namepaths to the load code */
282
283 if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
284 opcode_class = AML_CLASS_NAMED_OBJECT;
285 }
286
287 /*
288 * Handle the opcode based upon the opcode type
289 */
290 switch (opcode_class) {
291 case AML_CLASS_CONTROL:
292
293 status = acpi_ds_exec_begin_control_op(walk_state, op);
294 break;
295
296 case AML_CLASS_NAMED_OBJECT:
297
298 if (walk_state->walk_type & ACPI_WALK_METHOD) {
299 /*
300 * Found a named object declaration during method execution;
301 * we must enter this object into the namespace. The created
302 * object is temporary and will be deleted upon completion of
303 * the execution of this method.
304 *
305 * Note 10/2010: Except for the Scope() op. This opcode does
306 * not actually create a new object, it refers to an existing
307 * object. However, for Scope(), we want to indeed open a
308 * new scope.
309 */
310 if (op->common.aml_opcode != AML_SCOPE_OP) {
311 status =
312 acpi_ds_load2_begin_op(walk_state, NULL);
313 } else {
314 status =
315 acpi_ds_scope_stack_push(op->named.node,
316 op->named.node->
317 type, walk_state);
318 if (ACPI_FAILURE(status)) {
319 return_ACPI_STATUS(status);
320 }
321 }
322 }
323 break;
324
325 case AML_CLASS_EXECUTE:
326 case AML_CLASS_CREATE:
327
328 break;
329
330 default:
331
332 break;
333 }
334
335 /* Nothing to do here during method execution */
336
337 return_ACPI_STATUS(status);
338
339 error_exit:
340 status = acpi_ds_method_error(status, walk_state);
341 return_ACPI_STATUS(status);
342 }
343
344 /*****************************************************************************
345 *
346 * FUNCTION: acpi_ds_exec_end_op
347 *
348 * PARAMETERS: walk_state - Current state of the parse tree walk
349 *
350 * RETURN: Status
351 *
352 * DESCRIPTION: Ascending callback used during the execution of control
353 * methods. The only thing we really need to do here is to
354 * notice the beginning of IF, ELSE, and WHILE blocks.
355 *
356 ****************************************************************************/
357
acpi_ds_exec_end_op(struct acpi_walk_state * walk_state)358 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
359 {
360 union acpi_parse_object *op;
361 acpi_status status = AE_OK;
362 u32 op_type;
363 u32 op_class;
364 union acpi_parse_object *next_op;
365 union acpi_parse_object *first_arg;
366
367 ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
368
369 op = walk_state->op;
370 op_type = walk_state->op_info->type;
371 op_class = walk_state->op_info->class;
372
373 if (op_class == AML_CLASS_UNKNOWN) {
374 ACPI_ERROR((AE_INFO, "Unknown opcode 0x%X",
375 op->common.aml_opcode));
376 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
377 }
378
379 first_arg = op->common.value.arg;
380
381 /* Init the walk state */
382
383 walk_state->num_operands = 0;
384 walk_state->operand_index = 0;
385 walk_state->return_desc = NULL;
386 walk_state->result_obj = NULL;
387
388 /* Call debugger for single step support (DEBUG build only) */
389
390 status = acpi_db_single_step(walk_state, op, op_class);
391 if (ACPI_FAILURE(status)) {
392 return_ACPI_STATUS(status);
393 }
394
395 /* Decode the Opcode Class */
396
397 switch (op_class) {
398 case AML_CLASS_ARGUMENT: /* Constants, literals, etc. */
399
400 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
401 status = acpi_ds_evaluate_name_path(walk_state);
402 if (ACPI_FAILURE(status)) {
403 goto cleanup;
404 }
405 }
406 break;
407
408 case AML_CLASS_EXECUTE: /* Most operators with arguments */
409
410 /* Build resolved operand stack */
411
412 status = acpi_ds_create_operands(walk_state, first_arg);
413 if (ACPI_FAILURE(status)) {
414 goto cleanup;
415 }
416
417 /*
418 * All opcodes require operand resolution, with the only exceptions
419 * being the object_type and size_of operators.
420 */
421 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
422
423 /* Resolve all operands */
424
425 status = acpi_ex_resolve_operands(walk_state->opcode,
426 &(walk_state->
427 operands
428 [walk_state->
429 num_operands - 1]),
430 walk_state);
431 }
432
433 if (ACPI_SUCCESS(status)) {
434 /*
435 * Dispatch the request to the appropriate interpreter handler
436 * routine. There is one routine per opcode "type" based upon the
437 * number of opcode arguments and return type.
438 */
439 status =
440 acpi_gbl_op_type_dispatch[op_type] (walk_state);
441 } else {
442 /*
443 * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
444 * Local is uninitialized.
445 */
446 if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
447 (walk_state->opcode == AML_STORE_OP) &&
448 (walk_state->operands[0]->common.type ==
449 ACPI_TYPE_LOCAL_REFERENCE)
450 && (walk_state->operands[1]->common.type ==
451 ACPI_TYPE_LOCAL_REFERENCE)
452 && (walk_state->operands[0]->reference.class ==
453 walk_state->operands[1]->reference.class)
454 && (walk_state->operands[0]->reference.value ==
455 walk_state->operands[1]->reference.value)) {
456 status = AE_OK;
457 } else {
458 ACPI_EXCEPTION((AE_INFO, status,
459 "While resolving operands for [%s]",
460 acpi_ps_get_opcode_name
461 (walk_state->opcode)));
462 }
463 }
464
465 /* Always delete the argument objects and clear the operand stack */
466
467 acpi_ds_clear_operands(walk_state);
468
469 /*
470 * If a result object was returned from above, push it on the
471 * current result stack
472 */
473 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
474 status =
475 acpi_ds_result_push(walk_state->result_obj,
476 walk_state);
477 }
478 break;
479
480 default:
481
482 switch (op_type) {
483 case AML_TYPE_CONTROL: /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
484
485 /* 1 Operand, 0 external_result, 0 internal_result */
486
487 status = acpi_ds_exec_end_control_op(walk_state, op);
488
489 break;
490
491 case AML_TYPE_METHOD_CALL:
492 /*
493 * If the method is referenced from within a package
494 * declaration, it is not a invocation of the method, just
495 * a reference to it.
496 */
497 if ((op->asl.parent) &&
498 ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
499 || (op->asl.parent->asl.aml_opcode ==
500 AML_VAR_PACKAGE_OP))) {
501 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
502 "Method Reference in a Package, Op=%p\n",
503 op));
504
505 op->common.node = (struct acpi_namespace_node *)
506 op->asl.value.arg->asl.node;
507 acpi_ut_add_reference(op->asl.value.arg->asl.
508 node->object);
509 return_ACPI_STATUS(AE_OK);
510 }
511
512 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
513 "Method invocation, Op=%p\n", op));
514
515 /*
516 * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
517 * the method Node pointer
518 */
519 /* next_op points to the op that holds the method name */
520
521 next_op = first_arg;
522
523 /* next_op points to first argument op */
524
525 next_op = next_op->common.next;
526
527 /*
528 * Get the method's arguments and put them on the operand stack
529 */
530 status = acpi_ds_create_operands(walk_state, next_op);
531 if (ACPI_FAILURE(status)) {
532 break;
533 }
534
535 /*
536 * Since the operands will be passed to another control method,
537 * we must resolve all local references here (Local variables,
538 * arguments to *this* method, etc.)
539 */
540 status = acpi_ds_resolve_operands(walk_state);
541 if (ACPI_FAILURE(status)) {
542
543 /* On error, clear all resolved operands */
544
545 acpi_ds_clear_operands(walk_state);
546 break;
547 }
548
549 /*
550 * Tell the walk loop to preempt this running method and
551 * execute the new method
552 */
553 status = AE_CTRL_TRANSFER;
554
555 /*
556 * Return now; we don't want to disturb anything,
557 * especially the operand count!
558 */
559 return_ACPI_STATUS(status);
560
561 case AML_TYPE_CREATE_FIELD:
562
563 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
564 "Executing CreateField Buffer/Index Op=%p\n",
565 op));
566
567 status = acpi_ds_load2_end_op(walk_state);
568 if (ACPI_FAILURE(status)) {
569 break;
570 }
571
572 status =
573 acpi_ds_eval_buffer_field_operands(walk_state, op);
574 break;
575
576 case AML_TYPE_CREATE_OBJECT:
577
578 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
579 "Executing CreateObject (Buffer/Package) Op=%p\n",
580 op));
581
582 switch (op->common.parent->common.aml_opcode) {
583 case AML_NAME_OP:
584 /*
585 * Put the Node on the object stack (Contains the ACPI Name
586 * of this object)
587 */
588 walk_state->operands[0] = (void *)
589 op->common.parent->common.node;
590 walk_state->num_operands = 1;
591
592 status = acpi_ds_create_node(walk_state,
593 op->common.parent->
594 common.node,
595 op->common.parent);
596 if (ACPI_FAILURE(status)) {
597 break;
598 }
599
600 /* Fall through */
601 /*lint -fallthrough */
602
603 case AML_INT_EVAL_SUBTREE_OP:
604
605 status =
606 acpi_ds_eval_data_object_operands
607 (walk_state, op,
608 acpi_ns_get_attached_object(op->common.
609 parent->common.
610 node));
611 break;
612
613 default:
614
615 status =
616 acpi_ds_eval_data_object_operands
617 (walk_state, op, NULL);
618 break;
619 }
620
621 /*
622 * If a result object was returned from above, push it on the
623 * current result stack
624 */
625 if (walk_state->result_obj) {
626 status =
627 acpi_ds_result_push(walk_state->result_obj,
628 walk_state);
629 }
630 break;
631
632 case AML_TYPE_NAMED_FIELD:
633 case AML_TYPE_NAMED_COMPLEX:
634 case AML_TYPE_NAMED_SIMPLE:
635 case AML_TYPE_NAMED_NO_OBJ:
636
637 status = acpi_ds_load2_end_op(walk_state);
638 if (ACPI_FAILURE(status)) {
639 break;
640 }
641
642 if (op->common.aml_opcode == AML_REGION_OP) {
643 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
644 "Executing OpRegion Address/Length Op=%p\n",
645 op));
646
647 status =
648 acpi_ds_eval_region_operands(walk_state,
649 op);
650 if (ACPI_FAILURE(status)) {
651 break;
652 }
653 } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
654 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
655 "Executing DataTableRegion Strings Op=%p\n",
656 op));
657
658 status =
659 acpi_ds_eval_table_region_operands
660 (walk_state, op);
661 if (ACPI_FAILURE(status)) {
662 break;
663 }
664 } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
665 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
666 "Executing BankField Op=%p\n",
667 op));
668
669 status =
670 acpi_ds_eval_bank_field_operands(walk_state,
671 op);
672 if (ACPI_FAILURE(status)) {
673 break;
674 }
675 }
676 break;
677
678 case AML_TYPE_UNDEFINED:
679
680 ACPI_ERROR((AE_INFO,
681 "Undefined opcode type Op=%p", op));
682 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
683
684 case AML_TYPE_BOGUS:
685
686 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
687 "Internal opcode=%X type Op=%p\n",
688 walk_state->opcode, op));
689 break;
690
691 default:
692
693 ACPI_ERROR((AE_INFO,
694 "Unimplemented opcode, class=0x%X "
695 "type=0x%X Opcode=0x%X Op=%p",
696 op_class, op_type, op->common.aml_opcode,
697 op));
698
699 status = AE_NOT_IMPLEMENTED;
700 break;
701 }
702 }
703
704 /*
705 * ACPI 2.0 support for 64-bit integers: Truncate numeric
706 * result value if we are executing from a 32-bit ACPI table
707 */
708 (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
709
710 /*
711 * Check if we just completed the evaluation of a
712 * conditional predicate
713 */
714 if ((ACPI_SUCCESS(status)) &&
715 (walk_state->control_state) &&
716 (walk_state->control_state->common.state ==
717 ACPI_CONTROL_PREDICATE_EXECUTING) &&
718 (walk_state->control_state->control.predicate_op == op)) {
719 status =
720 acpi_ds_get_predicate_value(walk_state,
721 walk_state->result_obj);
722 walk_state->result_obj = NULL;
723 }
724
725 cleanup:
726
727 if (walk_state->result_obj) {
728
729 /* Break to debugger to display result */
730
731 acpi_db_display_result_object(walk_state->result_obj,
732 walk_state);
733
734 /*
735 * Delete the result op if and only if:
736 * Parent will not use the result -- such as any
737 * non-nested type2 op in a method (parent will be method)
738 */
739 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
740 walk_state);
741 }
742 #ifdef _UNDER_DEVELOPMENT
743
744 if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
745 acpi_db_method_end(walk_state);
746 }
747 #endif
748
749 /* Invoke exception handler on error */
750
751 if (ACPI_FAILURE(status)) {
752 status = acpi_ds_method_error(status, walk_state);
753 }
754
755 /* Always clear the object stack */
756
757 walk_state->num_operands = 0;
758 return_ACPI_STATUS(status);
759 }
760