Merge branch 'master' of /home/shaggy/git/linus-clean/
[linux-2.6] / drivers / acpi / acpica / dswexec.c
1 /******************************************************************************
2  *
3  * Module Name: dswexec - Dispatcher method execution callbacks;
4  *                        dispatch to interpreter.
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2008, 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
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, 16);
137         if (ACPI_FAILURE(status)) {
138                 goto cleanup;
139         }
140
141         if (ACPI_GET_OBJECT_TYPE(local_obj_desc) != ACPI_TYPE_INTEGER) {
142                 ACPI_ERROR((AE_INFO,
143                             "Bad predicate (not an integer) ObjDesc=%p State=%p Type=%X",
144                             obj_desc, walk_state,
145                             ACPI_GET_OBJECT_TYPE(obj_desc)));
146
147                 status = AE_AML_OPERAND_TYPE;
148                 goto cleanup;
149         }
150
151         /* Truncate the predicate to 32-bits if necessary */
152
153         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, "Completed a predicate eval=%X Op=%p\n",
177                           walk_state->control_state->common.value,
178                           walk_state->op));
179
180         /* Break to debugger to display result */
181
182         ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
183                            (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
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", op,
269                                   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                         status = acpi_ds_load2_begin_op(walk_state, NULL);
306                 }
307
308                 break;
309
310         case AML_CLASS_EXECUTE:
311         case AML_CLASS_CREATE:
312
313                 break;
314
315         default:
316                 break;
317         }
318
319         /* Nothing to do here during method execution */
320
321         return_ACPI_STATUS(status);
322
323       error_exit:
324         status = acpi_ds_method_error(status, walk_state);
325         return_ACPI_STATUS(status);
326 }
327
328 /*****************************************************************************
329  *
330  * FUNCTION:    acpi_ds_exec_end_op
331  *
332  * PARAMETERS:  walk_state      - Current state of the parse tree walk
333  *
334  * RETURN:      Status
335  *
336  * DESCRIPTION: Ascending callback used during the execution of control
337  *              methods.  The only thing we really need to do here is to
338  *              notice the beginning of IF, ELSE, and WHILE blocks.
339  *
340  ****************************************************************************/
341
342 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
343 {
344         union acpi_parse_object *op;
345         acpi_status status = AE_OK;
346         u32 op_type;
347         u32 op_class;
348         union acpi_parse_object *next_op;
349         union acpi_parse_object *first_arg;
350
351         ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
352
353         op = walk_state->op;
354         op_type = walk_state->op_info->type;
355         op_class = walk_state->op_info->class;
356
357         if (op_class == AML_CLASS_UNKNOWN) {
358                 ACPI_ERROR((AE_INFO, "Unknown opcode %X",
359                             op->common.aml_opcode));
360                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
361         }
362
363         first_arg = op->common.value.arg;
364
365         /* Init the walk state */
366
367         walk_state->num_operands = 0;
368         walk_state->operand_index = 0;
369         walk_state->return_desc = NULL;
370         walk_state->result_obj = NULL;
371
372         /* Call debugger for single step support (DEBUG build only) */
373
374         ACPI_DEBUGGER_EXEC(status =
375                            acpi_db_single_step(walk_state, op, op_class));
376         ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
377                            return_ACPI_STATUS(status);}
378         ) ;
379
380         /* Decode the Opcode Class */
381
382         switch (op_class) {
383         case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
384
385                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
386                         status = acpi_ds_evaluate_name_path(walk_state);
387                         if (ACPI_FAILURE(status)) {
388                                 goto cleanup;
389                         }
390                 }
391                 break;
392
393         case AML_CLASS_EXECUTE: /* Most operators with arguments */
394
395                 /* Build resolved operand stack */
396
397                 status = acpi_ds_create_operands(walk_state, first_arg);
398                 if (ACPI_FAILURE(status)) {
399                         goto cleanup;
400                 }
401
402                 /*
403                  * All opcodes require operand resolution, with the only exceptions
404                  * being the object_type and size_of operators.
405                  */
406                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
407
408                         /* Resolve all operands */
409
410                         status = acpi_ex_resolve_operands(walk_state->opcode,
411                                                           &(walk_state->
412                                                             operands
413                                                             [walk_state->
414                                                              num_operands - 1]),
415                                                           walk_state);
416                 }
417
418                 if (ACPI_SUCCESS(status)) {
419                         /*
420                          * Dispatch the request to the appropriate interpreter handler
421                          * routine.  There is one routine per opcode "type" based upon the
422                          * number of opcode arguments and return type.
423                          */
424                         status =
425                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
426                 } else {
427                         /*
428                          * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
429                          * Local is uninitialized.
430                          */
431                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
432                             (walk_state->opcode == AML_STORE_OP) &&
433                             (walk_state->operands[0]->common.type ==
434                              ACPI_TYPE_LOCAL_REFERENCE)
435                             && (walk_state->operands[1]->common.type ==
436                                 ACPI_TYPE_LOCAL_REFERENCE)
437                             && (walk_state->operands[0]->reference.class ==
438                                 walk_state->operands[1]->reference.class)
439                             && (walk_state->operands[0]->reference.value ==
440                                 walk_state->operands[1]->reference.value)) {
441                                 status = AE_OK;
442                         } else {
443                                 ACPI_EXCEPTION((AE_INFO, status,
444                                                 "While resolving operands for [%s]",
445                                                 acpi_ps_get_opcode_name
446                                                 (walk_state->opcode)));
447                         }
448                 }
449
450                 /* Always delete the argument objects and clear the operand stack */
451
452                 acpi_ds_clear_operands(walk_state);
453
454                 /*
455                  * If a result object was returned from above, push it on the
456                  * current result stack
457                  */
458                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
459                         status =
460                             acpi_ds_result_push(walk_state->result_obj,
461                                                 walk_state);
462                 }
463                 break;
464
465         default:
466
467                 switch (op_type) {
468                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
469
470                         /* 1 Operand, 0 external_result, 0 internal_result */
471
472                         status = acpi_ds_exec_end_control_op(walk_state, op);
473
474                         break;
475
476                 case AML_TYPE_METHOD_CALL:
477
478                         /*
479                          * If the method is referenced from within a package
480                          * declaration, it is not a invocation of the method, just
481                          * a reference to it.
482                          */
483                         if ((op->asl.parent) &&
484                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
485                              || (op->asl.parent->asl.aml_opcode ==
486                                  AML_VAR_PACKAGE_OP))) {
487                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
488                                                   "Method Reference in a Package, Op=%p\n",
489                                                   op));
490
491                                 op->common.node =
492                                     (struct acpi_namespace_node *)op->asl.value.
493                                     arg->asl.node;
494                                 acpi_ut_add_reference(op->asl.value.arg->asl.
495                                                       node->object);
496                                 return_ACPI_STATUS(AE_OK);
497                         }
498
499                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
500                                           "Method invocation, Op=%p\n", op));
501
502                         /*
503                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
504                          * the method Node pointer
505                          */
506                         /* next_op points to the op that holds the method name */
507
508                         next_op = first_arg;
509
510                         /* next_op points to first argument op */
511
512                         next_op = next_op->common.next;
513
514                         /*
515                          * Get the method's arguments and put them on the operand stack
516                          */
517                         status = acpi_ds_create_operands(walk_state, next_op);
518                         if (ACPI_FAILURE(status)) {
519                                 break;
520                         }
521
522                         /*
523                          * Since the operands will be passed to another control method,
524                          * we must resolve all local references here (Local variables,
525                          * arguments to *this* method, etc.)
526                          */
527                         status = acpi_ds_resolve_operands(walk_state);
528                         if (ACPI_FAILURE(status)) {
529
530                                 /* On error, clear all resolved operands */
531
532                                 acpi_ds_clear_operands(walk_state);
533                                 break;
534                         }
535
536                         /*
537                          * Tell the walk loop to preempt this running method and
538                          * execute the new method
539                          */
540                         status = AE_CTRL_TRANSFER;
541
542                         /*
543                          * Return now; we don't want to disturb anything,
544                          * especially the operand count!
545                          */
546                         return_ACPI_STATUS(status);
547
548                 case AML_TYPE_CREATE_FIELD:
549
550                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
551                                           "Executing CreateField Buffer/Index Op=%p\n",
552                                           op));
553
554                         status = acpi_ds_load2_end_op(walk_state);
555                         if (ACPI_FAILURE(status)) {
556                                 break;
557                         }
558
559                         status =
560                             acpi_ds_eval_buffer_field_operands(walk_state, op);
561                         break;
562
563                 case AML_TYPE_CREATE_OBJECT:
564
565                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
566                                           "Executing CreateObject (Buffer/Package) Op=%p\n",
567                                           op));
568
569                         switch (op->common.parent->common.aml_opcode) {
570                         case AML_NAME_OP:
571
572                                 /*
573                                  * Put the Node on the object stack (Contains the ACPI Name
574                                  * of this object)
575                                  */
576                                 walk_state->operands[0] =
577                                     (void *)op->common.parent->common.node;
578                                 walk_state->num_operands = 1;
579
580                                 status = acpi_ds_create_node(walk_state,
581                                                              op->common.parent->
582                                                              common.node,
583                                                              op->common.parent);
584                                 if (ACPI_FAILURE(status)) {
585                                         break;
586                                 }
587
588                                 /* Fall through */
589                                 /*lint -fallthrough */
590
591                         case AML_INT_EVAL_SUBTREE_OP:
592
593                                 status =
594                                     acpi_ds_eval_data_object_operands
595                                     (walk_state, op,
596                                      acpi_ns_get_attached_object(op->common.
597                                                                  parent->common.
598                                                                  node));
599                                 break;
600
601                         default:
602
603                                 status =
604                                     acpi_ds_eval_data_object_operands
605                                     (walk_state, op, NULL);
606                                 break;
607                         }
608
609                         /*
610                          * If a result object was returned from above, push it on the
611                          * current result stack
612                          */
613                         if (walk_state->result_obj) {
614                                 status =
615                                     acpi_ds_result_push(walk_state->result_obj,
616                                                         walk_state);
617                         }
618                         break;
619
620                 case AML_TYPE_NAMED_FIELD:
621                 case AML_TYPE_NAMED_COMPLEX:
622                 case AML_TYPE_NAMED_SIMPLE:
623                 case AML_TYPE_NAMED_NO_OBJ:
624
625                         status = acpi_ds_load2_end_op(walk_state);
626                         if (ACPI_FAILURE(status)) {
627                                 break;
628                         }
629
630                         if (op->common.aml_opcode == AML_REGION_OP) {
631                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
632                                                   "Executing OpRegion Address/Length Op=%p\n",
633                                                   op));
634
635                                 status =
636                                     acpi_ds_eval_region_operands(walk_state,
637                                                                  op);
638                                 if (ACPI_FAILURE(status)) {
639                                         break;
640                                 }
641                         } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
642                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
643                                                   "Executing DataTableRegion Strings Op=%p\n",
644                                                   op));
645
646                                 status =
647                                     acpi_ds_eval_table_region_operands
648                                     (walk_state, op);
649                                 if (ACPI_FAILURE(status)) {
650                                         break;
651                                 }
652                         } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
653                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
654                                                   "Executing BankField Op=%p\n",
655                                                   op));
656
657                                 status =
658                                     acpi_ds_eval_bank_field_operands(walk_state,
659                                                                      op);
660                                 if (ACPI_FAILURE(status)) {
661                                         break;
662                                 }
663                         }
664                         break;
665
666                 case AML_TYPE_UNDEFINED:
667
668                         ACPI_ERROR((AE_INFO,
669                                     "Undefined opcode type Op=%p", op));
670                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
671
672                 case AML_TYPE_BOGUS:
673
674                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
675                                           "Internal opcode=%X type Op=%p\n",
676                                           walk_state->opcode, op));
677                         break;
678
679                 default:
680
681                         ACPI_ERROR((AE_INFO,
682                                     "Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p",
683                                     op_class, op_type, op->common.aml_opcode,
684                                     op));
685
686                         status = AE_NOT_IMPLEMENTED;
687                         break;
688                 }
689         }
690
691         /*
692          * ACPI 2.0 support for 64-bit integers: Truncate numeric
693          * result value if we are executing from a 32-bit ACPI table
694          */
695         acpi_ex_truncate_for32bit_table(walk_state->result_obj);
696
697         /*
698          * Check if we just completed the evaluation of a
699          * conditional predicate
700          */
701         if ((ACPI_SUCCESS(status)) &&
702             (walk_state->control_state) &&
703             (walk_state->control_state->common.state ==
704              ACPI_CONTROL_PREDICATE_EXECUTING) &&
705             (walk_state->control_state->control.predicate_op == op)) {
706                 status =
707                     acpi_ds_get_predicate_value(walk_state,
708                                                 walk_state->result_obj);
709                 walk_state->result_obj = NULL;
710         }
711
712       cleanup:
713
714         if (walk_state->result_obj) {
715
716                 /* Break to debugger to display result */
717
718                 ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
719                                    (walk_state->result_obj, walk_state));
720
721                 /*
722                  * Delete the result op if and only if:
723                  * Parent will not use the result -- such as any
724                  * non-nested type2 op in a method (parent will be method)
725                  */
726                 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
727                                                   walk_state);
728         }
729 #ifdef _UNDER_DEVELOPMENT
730
731         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
732                 acpi_db_method_end(walk_state);
733         }
734 #endif
735
736         /* Invoke exception handler on error */
737
738         if (ACPI_FAILURE(status)) {
739                 status = acpi_ds_method_error(status, walk_state);
740         }
741
742         /* Always clear the object stack */
743
744         walk_state->num_operands = 0;
745         return_ACPI_STATUS(status);
746 }