1 /******************************************************************************
2 *
3 * Module Name: dswexec - Dispatcher method execution callbacks;
4 * dispatch to interpreter.
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2007, R. Byron Moore
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 <acpi/acparser.h>
47 #include <acpi/amlcode.h>
48 #include <acpi/acdispat.h>
49 #include <acpi/acinterp.h>
50 #include <acpi/acnamesp.h>
51 #include <acpi/acdebug.h>
52
53 #define _COMPONENT ACPI_DISPATCHER
54 ACPI_MODULE_NAME("dswexec")
55
56 /*
57 * Dispatch table for opcode classes
58 */
59 static ACPI_EXECUTE_OP acpi_gbl_op_type_dispatch[] = {
60 acpi_ex_opcode_0A_0T_1R,
61 acpi_ex_opcode_1A_0T_0R,
62 acpi_ex_opcode_1A_0T_1R,
63 acpi_ex_opcode_1A_1T_0R,
64 acpi_ex_opcode_1A_1T_1R,
65 acpi_ex_opcode_2A_0T_0R,
66 acpi_ex_opcode_2A_0T_1R,
67 acpi_ex_opcode_2A_1T_1R,
68 acpi_ex_opcode_2A_2T_1R,
69 acpi_ex_opcode_3A_0T_0R,
70 acpi_ex_opcode_3A_1T_1R,
71 acpi_ex_opcode_6A_0T_1R
72 };
73
74 /*****************************************************************************
75 *
76 * FUNCTION: acpi_ds_get_predicate_value
77 *
78 * PARAMETERS: walk_state - Current state of the parse tree walk
79 * result_obj - if non-zero, pop result from result stack
80 *
81 * RETURN: Status
82 *
83 * DESCRIPTION: Get the result of a predicate evaluation
84 *
85 ****************************************************************************/
86
87 acpi_status
88 acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
89 union acpi_operand_object *result_obj)
90 {
91 acpi_status status = AE_OK;
92 union acpi_operand_object *obj_desc;
93 union acpi_operand_object *local_obj_desc = NULL;
94
95 ACPI_FUNCTION_TRACE_PTR(ds_get_predicate_value, walk_state);
96
97 walk_state->control_state->common.state = 0;
98
99 if (result_obj) {
100 status = acpi_ds_result_pop(&obj_desc, walk_state);
101 if (ACPI_FAILURE(status)) {
102 ACPI_EXCEPTION((AE_INFO, status,
103 "Could not get result from predicate evaluation"));
104
105 return_ACPI_STATUS(status);
106 }
107 } else {
108 status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
109 if (ACPI_FAILURE(status)) {
110 return_ACPI_STATUS(status);
111 }
112
113 status =
114 acpi_ex_resolve_to_value(&walk_state->operands[0],
115 walk_state);
116 if (ACPI_FAILURE(status)) {
117 return_ACPI_STATUS(status);
118 }
119
120 obj_desc = walk_state->operands[0];
121 }
122
123 if (!obj_desc) {
124 ACPI_ERROR((AE_INFO,
125 "No predicate ObjDesc=%p State=%p",
126 obj_desc, walk_state));
127
128 return_ACPI_STATUS(AE_AML_NO_OPERAND);
129 }
130
131 /*
132 * Result of predicate evaluation must be an Integer
133 * object. Implicitly convert the argument if necessary.
134 */
135 status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc, 16);
136 if (ACPI_FAILURE(status)) {
137 goto cleanup;
138 }
139
140 if (ACPI_GET_OBJECT_TYPE(local_obj_desc) != ACPI_TYPE_INTEGER) {
141 ACPI_ERROR((AE_INFO,
142 "Bad predicate (not an integer) ObjDesc=%p State=%p Type=%X",
143 obj_desc, walk_state,
144 ACPI_GET_OBJECT_TYPE(obj_desc)));
145
146 status = AE_AML_OPERAND_TYPE;
147 goto cleanup;
148 }
149
150 /* Truncate the predicate to 32-bits if necessary */
151
152 acpi_ex_truncate_for32bit_table(local_obj_desc);
153
154 /*
155 * Save the result of the predicate evaluation on
156 * the control stack
157 */
158 if (local_obj_desc->integer.value) {
159 walk_state->control_state->common.value = TRUE;
160 } else {
161 /*
162 * Predicate is FALSE, we will just toss the
163 * rest of the package
164 */
165 walk_state->control_state->common.value = FALSE;
166 status = AE_CTRL_FALSE;
167 }
168
169 cleanup:
170
171 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
172 walk_state->control_state->common.value,
173 walk_state->op));
174
175 /* Break to debugger to display result */
176
177 ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
178 (local_obj_desc, walk_state));
179
180 /*
181 * Delete the predicate result object (we know that
182 * we don't need it anymore)
183 */
184 if (local_obj_desc != obj_desc) {
185 acpi_ut_remove_reference(local_obj_desc);
186 }
187 acpi_ut_remove_reference(obj_desc);
188
189 walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
190 return_ACPI_STATUS(status);
191 }
192
193 /*****************************************************************************
194 *
195 * FUNCTION: acpi_ds_exec_begin_op
196 *
197 * PARAMETERS: walk_state - Current state of the parse tree walk
198 * out_op - Where to return op if a new one is created
199 *
200 * RETURN: Status
201 *
202 * DESCRIPTION: Descending callback used during the execution of control
203 * methods. This is where most operators and operands are
204 * dispatched to the interpreter.
205 *
206 ****************************************************************************/
207
208 acpi_status
209 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
210 union acpi_parse_object **out_op)
211 {
212 union acpi_parse_object *op;
213 acpi_status status = AE_OK;
214 u32 opcode_class;
215
216 ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
217
218 op = walk_state->op;
219 if (!op) {
220 status = acpi_ds_load2_begin_op(walk_state, out_op);
221 if (ACPI_FAILURE(status)) {
222 goto error_exit;
223 }
224
225 op = *out_op;
226 walk_state->op = op;
227 walk_state->opcode = op->common.aml_opcode;
228 walk_state->op_info =
229 acpi_ps_get_opcode_info(op->common.aml_opcode);
230
231 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
232 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
233 "(%s) Popping scope for Op %p\n",
234 acpi_ut_get_type_name(walk_state->
235 op_info->
236 object_type),
237 op));
238
239 status = acpi_ds_scope_stack_pop(walk_state);
240 if (ACPI_FAILURE(status)) {
241 goto error_exit;
242 }
243 }
244 }
245
246 if (op == walk_state->origin) {
247 if (out_op) {
248 *out_op = op;
249 }
250
251 return_ACPI_STATUS(AE_OK);
252 }
253
254 /*
255 * If the previous opcode was a conditional, this opcode
256 * must be the beginning of the associated predicate.
257 * Save this knowledge in the current scope descriptor
258 */
259 if ((walk_state->control_state) &&
260 (walk_state->control_state->common.state ==
261 ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
262 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
263 "Exec predicate Op=%p State=%p\n", op,
264 walk_state));
265
266 walk_state->control_state->common.state =
267 ACPI_CONTROL_PREDICATE_EXECUTING;
268
269 /* Save start of predicate */
270
271 walk_state->control_state->control.predicate_op = op;
272 }
273
274 opcode_class = walk_state->op_info->class;
275
276 /* We want to send namepaths to the load code */
277
278 if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
279 opcode_class = AML_CLASS_NAMED_OBJECT;
280 }
281
282 /*
283 * Handle the opcode based upon the opcode type
284 */
285 switch (opcode_class) {
286 case AML_CLASS_CONTROL:
287
288 status = acpi_ds_result_stack_push(walk_state);
289 if (ACPI_FAILURE(status)) {
290 goto error_exit;
291 }
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 status = acpi_ds_load2_begin_op(walk_state, NULL);
306 }
307
308 if (op->common.aml_opcode == AML_REGION_OP) {
309 status = acpi_ds_result_stack_push(walk_state);
310 }
311 break;
312
313 case AML_CLASS_EXECUTE:
314 case AML_CLASS_CREATE:
315 /*
316 * Most operators with arguments (except create_xxx_field operators)
317 * Start a new result/operand state
318 */
319 if (walk_state->op_info->object_type != ACPI_TYPE_BUFFER_FIELD) {
320 status = acpi_ds_result_stack_push(walk_state);
321 }
322 break;
323
324 default:
325 break;
326 }
327
328 /* Nothing to do here during method execution */
329
330 return_ACPI_STATUS(status);
331
332 error_exit:
333 status = acpi_ds_method_error(status, walk_state);
334 return_ACPI_STATUS(status);
335 }
336
337 /*****************************************************************************
338 *
339 * FUNCTION: acpi_ds_exec_end_op
340 *
341 * PARAMETERS: walk_state - Current state of the parse tree walk
342 *
343 * RETURN: Status
344 *
345 * DESCRIPTION: Ascending callback used during the execution of control
346 * methods. The only thing we really need to do here is to
347 * notice the beginning of IF, ELSE, and WHILE blocks.
348 *
349 ****************************************************************************/
350
351 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
352 {
353 union acpi_parse_object *op;
354 acpi_status status = AE_OK;
355 u32 op_type;
356 u32 op_class;
357 union acpi_parse_object *next_op;
358 union acpi_parse_object *first_arg;
359
360 ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
361
362 op = walk_state->op;
363 op_type = walk_state->op_info->type;
364 op_class = walk_state->op_info->class;
365
366 if (op_class == AML_CLASS_UNKNOWN) {
367 ACPI_ERROR((AE_INFO, "Unknown opcode %X",
368 op->common.aml_opcode));
369 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
370 }
371
372 first_arg = op->common.value.arg;
373
374 /* Init the walk state */
375
376 walk_state->num_operands = 0;
377 walk_state->return_desc = NULL;
378 walk_state->result_obj = NULL;
379
380 /* Call debugger for single step support (DEBUG build only) */
381
382 ACPI_DEBUGGER_EXEC(status =
383 acpi_db_single_step(walk_state, op, op_class));
384 ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
385 return_ACPI_STATUS(status);}
386 ) ;
387
388 /* Decode the Opcode Class */
389
390 switch (op_class) {
391 case AML_CLASS_ARGUMENT: /* constants, literals, etc. - do nothing */
392 break;
393
394 case AML_CLASS_EXECUTE: /* most operators with arguments */
395
396 /* Build resolved operand stack */
397
398 status = acpi_ds_create_operands(walk_state, first_arg);
399 if (ACPI_FAILURE(status)) {
400 goto cleanup;
401 }
402
403 /* Done with this result state (Now that operand stack is built) */
404
405 status = acpi_ds_result_stack_pop(walk_state);
406 if (ACPI_FAILURE(status)) {
407 goto cleanup;
408 }
409
410 /*
411 * All opcodes require operand resolution, with the only exceptions
412 * being the object_type and size_of operators.
413 */
414 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
415
416 /* Resolve all operands */
417
418 status = acpi_ex_resolve_operands(walk_state->opcode,
419 &(walk_state->
420 operands
421 [walk_state->
422 num_operands - 1]),
423 walk_state);
424 if (ACPI_SUCCESS(status)) {
425 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
426 ACPI_IMODE_EXECUTE,
427 acpi_ps_get_opcode_name
428 (walk_state->opcode),
429 walk_state->num_operands,
430 "after ExResolveOperands");
431 }
432 }
433
434 if (ACPI_SUCCESS(status)) {
435 /*
436 * Dispatch the request to the appropriate interpreter handler
437 * routine. There is one routine per opcode "type" based upon the
438 * number of opcode arguments and return type.
439 */
440 status =
441 acpi_gbl_op_type_dispatch[op_type] (walk_state);
442 } else {
443 /*
444 * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
445 * Local is uninitialized.
446 */
447 if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
448 (walk_state->opcode == AML_STORE_OP) &&
449 (walk_state->operands[0]->common.type ==
450 ACPI_TYPE_LOCAL_REFERENCE)
451 && (walk_state->operands[1]->common.type ==
452 ACPI_TYPE_LOCAL_REFERENCE)
453 && (walk_state->operands[0]->reference.opcode ==
454 walk_state->operands[1]->reference.opcode)
455 && (walk_state->operands[0]->reference.offset ==
456 walk_state->operands[1]->reference.offset)) {
457 status = AE_OK;
458 } else {
459 ACPI_EXCEPTION((AE_INFO, status,
460 "While resolving operands for [%s]",
461 acpi_ps_get_opcode_name
462 (walk_state->opcode)));
463 }
464 }
465
466 /* Always delete the argument objects and clear the operand stack */
467
468 acpi_ds_clear_operands(walk_state);
469
470 /*
471 * If a result object was returned from above, push it on the
472 * current result stack
473 */
474 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
475 status =
476 acpi_ds_result_push(walk_state->result_obj,
477 walk_state);
478 }
479 break;
480
481 default:
482
483 switch (op_type) {
484 case AML_TYPE_CONTROL: /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
485
486 /* 1 Operand, 0 external_result, 0 internal_result */
487
488 status = acpi_ds_exec_end_control_op(walk_state, op);
489
490 /* Make sure to properly pop the result stack */
491
492 if (ACPI_SUCCESS(status)) {
493 status = acpi_ds_result_stack_pop(walk_state);
494 } else if (status == AE_CTRL_PENDING) {
495 status = acpi_ds_result_stack_pop(walk_state);
496 if (ACPI_SUCCESS(status)) {
497 status = AE_CTRL_PENDING;
498 }
499 }
500 break;
501
502 case AML_TYPE_METHOD_CALL:
503
504 /*
505 * If the method is referenced from within a package
506 * declaration, it is not a invocation of the method, just
507 * a reference to it.
508 */
509 if ((op->asl.parent) &&
510 ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
511 || (op->asl.parent->asl.aml_opcode ==
512 AML_VAR_PACKAGE_OP))) {
513 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
514 "Method Reference in a Package, Op=%p\n",
515 op));
516
517 op->common.node =
518 (struct acpi_namespace_node *)op->asl.value.
519 arg->asl.node->object;
520 acpi_ut_add_reference(op->asl.value.arg->asl.
521 node->object);
522 return_ACPI_STATUS(AE_OK);
523 }
524
525 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
526 "Method invocation, Op=%p\n", op));
527
528 /*
529 * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
530 * the method Node pointer
531 */
532 /* next_op points to the op that holds the method name */
533
534 next_op = first_arg;
535
536 /* next_op points to first argument op */
537
538 next_op = next_op->common.next;
539
540 /*
541 * Get the method's arguments and put them on the operand stack
542 */
543 status = acpi_ds_create_operands(walk_state, next_op);
544 if (ACPI_FAILURE(status)) {
545 break;
546 }
547
548 /*
549 * Since the operands will be passed to another control method,
550 * we must resolve all local references here (Local variables,
551 * arguments to *this* method, etc.)
552 */
553 status = acpi_ds_resolve_operands(walk_state);
554 if (ACPI_FAILURE(status)) {
555
556 /* On error, clear all resolved operands */
557
558 acpi_ds_clear_operands(walk_state);
559 break;
560 }
561
562 /*
563 * Tell the walk loop to preempt this running method and
564 * execute the new method
565 */
566 status = AE_CTRL_TRANSFER;
567
568 /*
569 * Return now; we don't want to disturb anything,
570 * especially the operand count!
571 */
572 return_ACPI_STATUS(status);
573
574 case AML_TYPE_CREATE_FIELD:
575
576 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
577 "Executing CreateField Buffer/Index Op=%p\n",
578 op));
579
580 status = acpi_ds_load2_end_op(walk_state);
581 if (ACPI_FAILURE(status)) {
582 break;
583 }
584
585 status =
586 acpi_ds_eval_buffer_field_operands(walk_state, op);
587 break;
588
589 case AML_TYPE_CREATE_OBJECT:
590
591 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
592 "Executing CreateObject (Buffer/Package) Op=%p\n",
593 op));
594
595 switch (op->common.parent->common.aml_opcode) {
596 case AML_NAME_OP:
597
598 /*
599 * Put the Node on the object stack (Contains the ACPI Name
600 * of this object)
601 */
602 walk_state->operands[0] =
603 (void *)op->common.parent->common.node;
604 walk_state->num_operands = 1;
605
606 status = acpi_ds_create_node(walk_state,
607 op->common.parent->
608 common.node,
609 op->common.parent);
610 if (ACPI_FAILURE(status)) {
611 break;
612 }
613
614 /* Fall through */
615 /*lint -fallthrough */
616
617 case AML_INT_EVAL_SUBTREE_OP:
618
619 status =
620 acpi_ds_eval_data_object_operands
621 (walk_state, op,
622 acpi_ns_get_attached_object(op->common.
623 parent->common.
624 node));
625 break;
626
627 default:
628
629 status =
630 acpi_ds_eval_data_object_operands
631 (walk_state, op, NULL);
632 break;
633 }
634
635 /* Done with result state (Now that operand stack is built) */
636
637 status = acpi_ds_result_stack_pop(walk_state);
638 if (ACPI_FAILURE(status)) {
639 goto cleanup;
640 }
641
642 /*
643 * If a result object was returned from above, push it on the
644 * current result stack
645 */
646 if (walk_state->result_obj) {
647 status =
648 acpi_ds_result_push(walk_state->result_obj,
649 walk_state);
650 }
651 break;
652
653 case AML_TYPE_NAMED_FIELD:
654 case AML_TYPE_NAMED_COMPLEX:
655 case AML_TYPE_NAMED_SIMPLE:
656 case AML_TYPE_NAMED_NO_OBJ:
657
658 status = acpi_ds_load2_end_op(walk_state);
659 if (ACPI_FAILURE(status)) {
660 break;
661 }
662
663 if (op->common.aml_opcode == AML_REGION_OP) {
664 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
665 "Executing OpRegion Address/Length Op=%p\n",
666 op));
667
668 status =
669 acpi_ds_eval_region_operands(walk_state,
670 op);
671 if (ACPI_FAILURE(status)) {
672 break;
673 }
674
675 status = acpi_ds_result_stack_pop(walk_state);
676 }
677 break;
678
679 case AML_TYPE_UNDEFINED:
680
681 ACPI_ERROR((AE_INFO,
682 "Undefined opcode type Op=%p", op));
683 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
684
685 case AML_TYPE_BOGUS:
686
687 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
688 "Internal opcode=%X type Op=%p\n",
689 walk_state->opcode, op));
690 break;
691
692 default:
693
694 ACPI_ERROR((AE_INFO,
695 "Unimplemented opcode, class=%X type=%X Opcode=%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 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_DEBUGGER_EXEC(acpi_db_display_result_object
732 (walk_state->result_obj, 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
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