Merge branch 'topic/asoc' into for-linus
[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 (local_obj_desc->common.type != 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, obj_desc->common.type));
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         /* Predicate can be used for an implicit return value */
170
171         (void)acpi_ds_do_implicit_return(local_obj_desc, walk_state, TRUE);
172
173       cleanup:
174
175         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
176                           walk_state->control_state->common.value,
177                           walk_state->op));
178
179         /* Break to debugger to display result */
180
181         ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
182                            (local_obj_desc, walk_state));
183
184         /*
185          * Delete the predicate result object (we know that
186          * we don't need it anymore)
187          */
188         if (local_obj_desc != obj_desc) {
189                 acpi_ut_remove_reference(local_obj_desc);
190         }
191         acpi_ut_remove_reference(obj_desc);
192
193         walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
194         return_ACPI_STATUS(status);
195 }
196
197 /*****************************************************************************
198  *
199  * FUNCTION:    acpi_ds_exec_begin_op
200  *
201  * PARAMETERS:  walk_state      - Current state of the parse tree walk
202  *              out_op          - Where to return op if a new one is created
203  *
204  * RETURN:      Status
205  *
206  * DESCRIPTION: Descending callback used during the execution of control
207  *              methods.  This is where most operators and operands are
208  *              dispatched to the interpreter.
209  *
210  ****************************************************************************/
211
212 acpi_status
213 acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
214                       union acpi_parse_object **out_op)
215 {
216         union acpi_parse_object *op;
217         acpi_status status = AE_OK;
218         u32 opcode_class;
219
220         ACPI_FUNCTION_TRACE_PTR(ds_exec_begin_op, walk_state);
221
222         op = walk_state->op;
223         if (!op) {
224                 status = acpi_ds_load2_begin_op(walk_state, out_op);
225                 if (ACPI_FAILURE(status)) {
226                         goto error_exit;
227                 }
228
229                 op = *out_op;
230                 walk_state->op = op;
231                 walk_state->opcode = op->common.aml_opcode;
232                 walk_state->op_info =
233                     acpi_ps_get_opcode_info(op->common.aml_opcode);
234
235                 if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
236                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
237                                           "(%s) Popping scope for Op %p\n",
238                                           acpi_ut_get_type_name(walk_state->
239                                                                 op_info->
240                                                                 object_type),
241                                           op));
242
243                         status = acpi_ds_scope_stack_pop(walk_state);
244                         if (ACPI_FAILURE(status)) {
245                                 goto error_exit;
246                         }
247                 }
248         }
249
250         if (op == walk_state->origin) {
251                 if (out_op) {
252                         *out_op = op;
253                 }
254
255                 return_ACPI_STATUS(AE_OK);
256         }
257
258         /*
259          * If the previous opcode was a conditional, this opcode
260          * must be the beginning of the associated predicate.
261          * Save this knowledge in the current scope descriptor
262          */
263         if ((walk_state->control_state) &&
264             (walk_state->control_state->common.state ==
265              ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
266                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
267                                   "Exec predicate Op=%p State=%p\n", op,
268                                   walk_state));
269
270                 walk_state->control_state->common.state =
271                     ACPI_CONTROL_PREDICATE_EXECUTING;
272
273                 /* Save start of predicate */
274
275                 walk_state->control_state->control.predicate_op = op;
276         }
277
278         opcode_class = walk_state->op_info->class;
279
280         /* We want to send namepaths to the load code */
281
282         if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
283                 opcode_class = AML_CLASS_NAMED_OBJECT;
284         }
285
286         /*
287          * Handle the opcode based upon the opcode type
288          */
289         switch (opcode_class) {
290         case AML_CLASS_CONTROL:
291
292                 status = acpi_ds_exec_begin_control_op(walk_state, op);
293                 break;
294
295         case AML_CLASS_NAMED_OBJECT:
296
297                 if (walk_state->walk_type & ACPI_WALK_METHOD) {
298                         /*
299                          * Found a named object declaration during method execution;
300                          * we must enter this object into the namespace.  The created
301                          * object is temporary and will be deleted upon completion of
302                          * the execution of this method.
303                          */
304                         status = acpi_ds_load2_begin_op(walk_state, NULL);
305                 }
306
307                 break;
308
309         case AML_CLASS_EXECUTE:
310         case AML_CLASS_CREATE:
311
312                 break;
313
314         default:
315                 break;
316         }
317
318         /* Nothing to do here during method execution */
319
320         return_ACPI_STATUS(status);
321
322       error_exit:
323         status = acpi_ds_method_error(status, walk_state);
324         return_ACPI_STATUS(status);
325 }
326
327 /*****************************************************************************
328  *
329  * FUNCTION:    acpi_ds_exec_end_op
330  *
331  * PARAMETERS:  walk_state      - Current state of the parse tree walk
332  *
333  * RETURN:      Status
334  *
335  * DESCRIPTION: Ascending callback used during the execution of control
336  *              methods.  The only thing we really need to do here is to
337  *              notice the beginning of IF, ELSE, and WHILE blocks.
338  *
339  ****************************************************************************/
340
341 acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
342 {
343         union acpi_parse_object *op;
344         acpi_status status = AE_OK;
345         u32 op_type;
346         u32 op_class;
347         union acpi_parse_object *next_op;
348         union acpi_parse_object *first_arg;
349
350         ACPI_FUNCTION_TRACE_PTR(ds_exec_end_op, walk_state);
351
352         op = walk_state->op;
353         op_type = walk_state->op_info->type;
354         op_class = walk_state->op_info->class;
355
356         if (op_class == AML_CLASS_UNKNOWN) {
357                 ACPI_ERROR((AE_INFO, "Unknown opcode %X",
358                             op->common.aml_opcode));
359                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
360         }
361
362         first_arg = op->common.value.arg;
363
364         /* Init the walk state */
365
366         walk_state->num_operands = 0;
367         walk_state->operand_index = 0;
368         walk_state->return_desc = NULL;
369         walk_state->result_obj = NULL;
370
371         /* Call debugger for single step support (DEBUG build only) */
372
373         ACPI_DEBUGGER_EXEC(status =
374                            acpi_db_single_step(walk_state, op, op_class));
375         ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
376                            return_ACPI_STATUS(status);}
377         ) ;
378
379         /* Decode the Opcode Class */
380
381         switch (op_class) {
382         case AML_CLASS_ARGUMENT:        /* Constants, literals, etc. */
383
384                 if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
385                         status = acpi_ds_evaluate_name_path(walk_state);
386                         if (ACPI_FAILURE(status)) {
387                                 goto cleanup;
388                         }
389                 }
390                 break;
391
392         case AML_CLASS_EXECUTE: /* Most operators with arguments */
393
394                 /* Build resolved operand stack */
395
396                 status = acpi_ds_create_operands(walk_state, first_arg);
397                 if (ACPI_FAILURE(status)) {
398                         goto cleanup;
399                 }
400
401                 /*
402                  * All opcodes require operand resolution, with the only exceptions
403                  * being the object_type and size_of operators.
404                  */
405                 if (!(walk_state->op_info->flags & AML_NO_OPERAND_RESOLVE)) {
406
407                         /* Resolve all operands */
408
409                         status = acpi_ex_resolve_operands(walk_state->opcode,
410                                                           &(walk_state->
411                                                             operands
412                                                             [walk_state->
413                                                              num_operands - 1]),
414                                                           walk_state);
415                 }
416
417                 if (ACPI_SUCCESS(status)) {
418                         /*
419                          * Dispatch the request to the appropriate interpreter handler
420                          * routine.  There is one routine per opcode "type" based upon the
421                          * number of opcode arguments and return type.
422                          */
423                         status =
424                             acpi_gbl_op_type_dispatch[op_type] (walk_state);
425                 } else {
426                         /*
427                          * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
428                          * Local is uninitialized.
429                          */
430                         if ((status == AE_AML_UNINITIALIZED_LOCAL) &&
431                             (walk_state->opcode == AML_STORE_OP) &&
432                             (walk_state->operands[0]->common.type ==
433                              ACPI_TYPE_LOCAL_REFERENCE)
434                             && (walk_state->operands[1]->common.type ==
435                                 ACPI_TYPE_LOCAL_REFERENCE)
436                             && (walk_state->operands[0]->reference.class ==
437                                 walk_state->operands[1]->reference.class)
438                             && (walk_state->operands[0]->reference.value ==
439                                 walk_state->operands[1]->reference.value)) {
440                                 status = AE_OK;
441                         } else {
442                                 ACPI_EXCEPTION((AE_INFO, status,
443                                                 "While resolving operands for [%s]",
444                                                 acpi_ps_get_opcode_name
445                                                 (walk_state->opcode)));
446                         }
447                 }
448
449                 /* Always delete the argument objects and clear the operand stack */
450
451                 acpi_ds_clear_operands(walk_state);
452
453                 /*
454                  * If a result object was returned from above, push it on the
455                  * current result stack
456                  */
457                 if (ACPI_SUCCESS(status) && walk_state->result_obj) {
458                         status =
459                             acpi_ds_result_push(walk_state->result_obj,
460                                                 walk_state);
461                 }
462                 break;
463
464         default:
465
466                 switch (op_type) {
467                 case AML_TYPE_CONTROL:  /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
468
469                         /* 1 Operand, 0 external_result, 0 internal_result */
470
471                         status = acpi_ds_exec_end_control_op(walk_state, op);
472
473                         break;
474
475                 case AML_TYPE_METHOD_CALL:
476
477                         /*
478                          * If the method is referenced from within a package
479                          * declaration, it is not a invocation of the method, just
480                          * a reference to it.
481                          */
482                         if ((op->asl.parent) &&
483                             ((op->asl.parent->asl.aml_opcode == AML_PACKAGE_OP)
484                              || (op->asl.parent->asl.aml_opcode ==
485                                  AML_VAR_PACKAGE_OP))) {
486                                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
487                                                   "Method Reference in a Package, Op=%p\n",
488                                                   op));
489
490                                 op->common.node =
491                                     (struct acpi_namespace_node *)op->asl.value.
492                                     arg->asl.node;
493                                 acpi_ut_add_reference(op->asl.value.arg->asl.
494                                                       node->object);
495                                 return_ACPI_STATUS(AE_OK);
496                         }
497
498                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
499                                           "Method invocation, Op=%p\n", op));
500
501                         /*
502                          * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
503                          * the method Node pointer
504                          */
505                         /* next_op points to the op that holds the method name */
506
507                         next_op = first_arg;
508
509                         /* next_op points to first argument op */
510
511                         next_op = next_op->common.next;
512
513                         /*
514                          * Get the method's arguments and put them on the operand stack
515                          */
516                         status = acpi_ds_create_operands(walk_state, next_op);
517                         if (ACPI_FAILURE(status)) {
518                                 break;
519                         }
520
521                         /*
522                          * Since the operands will be passed to another control method,
523                          * we must resolve all local references here (Local variables,
524                          * arguments to *this* method, etc.)
525                          */
526                         status = acpi_ds_resolve_operands(walk_state);
527                         if (ACPI_FAILURE(status)) {
528
529                                 /* On error, clear all resolved operands */
530
531                                 acpi_ds_clear_operands(walk_state);
532                                 break;
533                         }
534
535                         /*
536                          * Tell the walk loop to preempt this running method and
537                          * execute the new method
538                          */
539                         status = AE_CTRL_TRANSFER;
540
541                         /*
542                          * Return now; we don't want to disturb anything,
543                          * especially the operand count!
544                          */
545                         return_ACPI_STATUS(status);
546
547                 case AML_TYPE_CREATE_FIELD:
548
549                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
550                                           "Executing CreateField Buffer/Index Op=%p\n",
551                                           op));
552
553                         status = acpi_ds_load2_end_op(walk_state);
554                         if (ACPI_FAILURE(status)) {
555                                 break;
556                         }
557
558                         status =
559                             acpi_ds_eval_buffer_field_operands(walk_state, op);
560                         break;
561
562                 case AML_TYPE_CREATE_OBJECT:
563
564                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
565                                           "Executing CreateObject (Buffer/Package) Op=%p\n",
566                                           op));
567
568                         switch (op->common.parent->common.aml_opcode) {
569                         case AML_NAME_OP:
570
571                                 /*
572                                  * Put the Node on the object stack (Contains the ACPI Name
573                                  * of this object)
574                                  */
575                                 walk_state->operands[0] =
576                                     (void *)op->common.parent->common.node;
577                                 walk_state->num_operands = 1;
578
579                                 status = acpi_ds_create_node(walk_state,
580                                                              op->common.parent->
581                                                              common.node,
582                                                              op->common.parent);
583                                 if (ACPI_FAILURE(status)) {
584                                         break;
585                                 }
586
587                                 /* Fall through */
588                                 /*lint -fallthrough */
589
590                         case AML_INT_EVAL_SUBTREE_OP:
591
592                                 status =
593                                     acpi_ds_eval_data_object_operands
594                                     (walk_state, op,
595                                      acpi_ns_get_attached_object(op->common.
596                                                                  parent->common.
597                                                                  node));
598                                 break;
599
600                         default:
601
602                                 status =
603                                     acpi_ds_eval_data_object_operands
604                                     (walk_state, op, NULL);
605                                 break;
606                         }
607
608                         /*
609                          * If a result object was returned from above, push it on the
610                          * current result stack
611                          */
612                         if (walk_state->result_obj) {
613                                 status =
614                                     acpi_ds_result_push(walk_state->result_obj,
615                                                         walk_state);
616                         }
617                         break;
618
619                 case AML_TYPE_NAMED_FIELD:
620                 case AML_TYPE_NAMED_COMPLEX:
621                 case AML_TYPE_NAMED_SIMPLE:
622                 case AML_TYPE_NAMED_NO_OBJ:
623
624                         status = acpi_ds_load2_end_op(walk_state);
625                         if (ACPI_FAILURE(status)) {
626                                 break;
627                         }
628
629                         if (op->common.aml_opcode == AML_REGION_OP) {
630                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
631                                                   "Executing OpRegion Address/Length Op=%p\n",
632                                                   op));
633
634                                 status =
635                                     acpi_ds_eval_region_operands(walk_state,
636                                                                  op);
637                                 if (ACPI_FAILURE(status)) {
638                                         break;
639                                 }
640                         } else if (op->common.aml_opcode == AML_DATA_REGION_OP) {
641                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
642                                                   "Executing DataTableRegion Strings Op=%p\n",
643                                                   op));
644
645                                 status =
646                                     acpi_ds_eval_table_region_operands
647                                     (walk_state, op);
648                                 if (ACPI_FAILURE(status)) {
649                                         break;
650                                 }
651                         } else if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
652                                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
653                                                   "Executing BankField Op=%p\n",
654                                                   op));
655
656                                 status =
657                                     acpi_ds_eval_bank_field_operands(walk_state,
658                                                                      op);
659                                 if (ACPI_FAILURE(status)) {
660                                         break;
661                                 }
662                         }
663                         break;
664
665                 case AML_TYPE_UNDEFINED:
666
667                         ACPI_ERROR((AE_INFO,
668                                     "Undefined opcode type Op=%p", op));
669                         return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
670
671                 case AML_TYPE_BOGUS:
672
673                         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
674                                           "Internal opcode=%X type Op=%p\n",
675                                           walk_state->opcode, op));
676                         break;
677
678                 default:
679
680                         ACPI_ERROR((AE_INFO,
681                                     "Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p",
682                                     op_class, op_type, op->common.aml_opcode,
683                                     op));
684
685                         status = AE_NOT_IMPLEMENTED;
686                         break;
687                 }
688         }
689
690         /*
691          * ACPI 2.0 support for 64-bit integers: Truncate numeric
692          * result value if we are executing from a 32-bit ACPI table
693          */
694         acpi_ex_truncate_for32bit_table(walk_state->result_obj);
695
696         /*
697          * Check if we just completed the evaluation of a
698          * conditional predicate
699          */
700         if ((ACPI_SUCCESS(status)) &&
701             (walk_state->control_state) &&
702             (walk_state->control_state->common.state ==
703              ACPI_CONTROL_PREDICATE_EXECUTING) &&
704             (walk_state->control_state->control.predicate_op == op)) {
705                 status =
706                     acpi_ds_get_predicate_value(walk_state,
707                                                 walk_state->result_obj);
708                 walk_state->result_obj = NULL;
709         }
710
711       cleanup:
712
713         if (walk_state->result_obj) {
714
715                 /* Break to debugger to display result */
716
717                 ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
718                                    (walk_state->result_obj, walk_state));
719
720                 /*
721                  * Delete the result op if and only if:
722                  * Parent will not use the result -- such as any
723                  * non-nested type2 op in a method (parent will be method)
724                  */
725                 acpi_ds_delete_result_if_not_used(op, walk_state->result_obj,
726                                                   walk_state);
727         }
728 #ifdef _UNDER_DEVELOPMENT
729
730         if (walk_state->parser_state.aml == walk_state->parser_state.aml_end) {
731                 acpi_db_method_end(walk_state);
732         }
733 #endif
734
735         /* Invoke exception handler on error */
736
737         if (ACPI_FAILURE(status)) {
738                 status = acpi_ds_method_error(status, walk_state);
739         }
740
741         /* Always clear the object stack */
742
743         walk_state->num_operands = 0;
744         return_ACPI_STATUS(status);
745 }