1 /******************************************************************************
3 * Module Name: dswexec - Dispatcher method execution callbacks;
4 * dispatch to interpreter.
6 *****************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2015, Intel Corp.
13 * All rights reserved.
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
38 * The above copyright and patent license is granted only if the following
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
73 * 3.4. Intel retains all right, title, and interest in and to the Original
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
81 * 4. Disclaimer and Export Compliance
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
115 *****************************************************************************/
118 #include "accommon.h"
119 #include "acparser.h"
121 #include "acdispat.h"
122 #include "acinterp.h"
123 #include "acnamesp.h"
127 #define _COMPONENT ACPI_DISPATCHER
128 ACPI_MODULE_NAME ("dswexec")
131 * Dispatch table for opcode classes
133 static ACPI_EXECUTE_OP AcpiGbl_OpTypeDispatch [] =
135 AcpiExOpcode_0A_0T_1R,
136 AcpiExOpcode_1A_0T_0R,
137 AcpiExOpcode_1A_0T_1R,
138 AcpiExOpcode_1A_1T_0R,
139 AcpiExOpcode_1A_1T_1R,
140 AcpiExOpcode_2A_0T_0R,
141 AcpiExOpcode_2A_0T_1R,
142 AcpiExOpcode_2A_1T_1R,
143 AcpiExOpcode_2A_2T_1R,
144 AcpiExOpcode_3A_0T_0R,
145 AcpiExOpcode_3A_1T_1R,
146 AcpiExOpcode_6A_0T_1R
150 /*****************************************************************************
152 * FUNCTION: AcpiDsGetPredicateValue
154 * PARAMETERS: WalkState - Current state of the parse tree walk
155 * ResultObj - if non-zero, pop result from result stack
159 * DESCRIPTION: Get the result of a predicate evaluation
161 ****************************************************************************/
164 AcpiDsGetPredicateValue (
165 ACPI_WALK_STATE *WalkState,
166 ACPI_OPERAND_OBJECT *ResultObj)
168 ACPI_STATUS Status = AE_OK;
169 ACPI_OPERAND_OBJECT *ObjDesc;
170 ACPI_OPERAND_OBJECT *LocalObjDesc = NULL;
173 ACPI_FUNCTION_TRACE_PTR (DsGetPredicateValue, WalkState);
176 WalkState->ControlState->Common.State = 0;
180 Status = AcpiDsResultPop (&ObjDesc, WalkState);
181 if (ACPI_FAILURE (Status))
183 ACPI_EXCEPTION ((AE_INFO, Status,
184 "Could not get result from predicate evaluation"));
186 return_ACPI_STATUS (Status);
191 Status = AcpiDsCreateOperand (WalkState, WalkState->Op, 0);
192 if (ACPI_FAILURE (Status))
194 return_ACPI_STATUS (Status);
197 Status = AcpiExResolveToValue (&WalkState->Operands [0], WalkState);
198 if (ACPI_FAILURE (Status))
200 return_ACPI_STATUS (Status);
203 ObjDesc = WalkState->Operands [0];
208 ACPI_ERROR ((AE_INFO,
209 "No predicate ObjDesc=%p State=%p",
210 ObjDesc, WalkState));
212 return_ACPI_STATUS (AE_AML_NO_OPERAND);
216 * Result of predicate evaluation must be an Integer
217 * object. Implicitly convert the argument if necessary.
219 Status = AcpiExConvertToInteger (ObjDesc, &LocalObjDesc, 16);
220 if (ACPI_FAILURE (Status))
225 if (LocalObjDesc->Common.Type != ACPI_TYPE_INTEGER)
227 ACPI_ERROR ((AE_INFO,
228 "Bad predicate (not an integer) ObjDesc=%p State=%p Type=0x%X",
229 ObjDesc, WalkState, ObjDesc->Common.Type));
231 Status = AE_AML_OPERAND_TYPE;
235 /* Truncate the predicate to 32-bits if necessary */
237 (void) AcpiExTruncateFor32bitTable (LocalObjDesc);
240 * Save the result of the predicate evaluation on
243 if (LocalObjDesc->Integer.Value)
245 WalkState->ControlState->Common.Value = TRUE;
250 * Predicate is FALSE, we will just toss the
251 * rest of the package
253 WalkState->ControlState->Common.Value = FALSE;
254 Status = AE_CTRL_FALSE;
257 /* Predicate can be used for an implicit return value */
259 (void) AcpiDsDoImplicitReturn (LocalObjDesc, WalkState, TRUE);
264 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
265 WalkState->ControlState->Common.Value, WalkState->Op));
267 /* Break to debugger to display result */
269 ACPI_DEBUGGER_EXEC (AcpiDbDisplayResultObject (LocalObjDesc, WalkState));
272 * Delete the predicate result object (we know that
273 * we don't need it anymore)
275 if (LocalObjDesc != ObjDesc)
277 AcpiUtRemoveReference (LocalObjDesc);
279 AcpiUtRemoveReference (ObjDesc);
281 WalkState->ControlState->Common.State = ACPI_CONTROL_NORMAL;
282 return_ACPI_STATUS (Status);
286 /*****************************************************************************
288 * FUNCTION: AcpiDsExecBeginOp
290 * PARAMETERS: WalkState - Current state of the parse tree walk
291 * OutOp - Where to return op if a new one is created
295 * DESCRIPTION: Descending callback used during the execution of control
296 * methods. This is where most operators and operands are
297 * dispatched to the interpreter.
299 ****************************************************************************/
303 ACPI_WALK_STATE *WalkState,
304 ACPI_PARSE_OBJECT **OutOp)
306 ACPI_PARSE_OBJECT *Op;
307 ACPI_STATUS Status = AE_OK;
311 ACPI_FUNCTION_TRACE_PTR (DsExecBeginOp, WalkState);
317 Status = AcpiDsLoad2BeginOp (WalkState, OutOp);
318 if (ACPI_FAILURE (Status))
325 WalkState->Opcode = Op->Common.AmlOpcode;
326 WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
328 if (AcpiNsOpensScope (WalkState->OpInfo->ObjectType))
330 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
331 "(%s) Popping scope for Op %p\n",
332 AcpiUtGetTypeName (WalkState->OpInfo->ObjectType), Op));
334 Status = AcpiDsScopeStackPop (WalkState);
335 if (ACPI_FAILURE (Status))
342 if (Op == WalkState->Origin)
349 return_ACPI_STATUS (AE_OK);
353 * If the previous opcode was a conditional, this opcode
354 * must be the beginning of the associated predicate.
355 * Save this knowledge in the current scope descriptor
357 if ((WalkState->ControlState) &&
358 (WalkState->ControlState->Common.State ==
359 ACPI_CONTROL_CONDITIONAL_EXECUTING))
361 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Exec predicate Op=%p State=%p\n",
364 WalkState->ControlState->Common.State = ACPI_CONTROL_PREDICATE_EXECUTING;
366 /* Save start of predicate */
368 WalkState->ControlState->Control.PredicateOp = Op;
372 OpcodeClass = WalkState->OpInfo->Class;
374 /* We want to send namepaths to the load code */
376 if (Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
378 OpcodeClass = AML_CLASS_NAMED_OBJECT;
382 * Handle the opcode based upon the opcode type
386 case AML_CLASS_CONTROL:
388 Status = AcpiDsExecBeginControlOp (WalkState, Op);
391 case AML_CLASS_NAMED_OBJECT:
393 if (WalkState->WalkType & ACPI_WALK_METHOD)
396 * Found a named object declaration during method execution;
397 * we must enter this object into the namespace. The created
398 * object is temporary and will be deleted upon completion of
399 * the execution of this method.
401 * Note 10/2010: Except for the Scope() op. This opcode does
402 * not actually create a new object, it refers to an existing
403 * object. However, for Scope(), we want to indeed open a
406 if (Op->Common.AmlOpcode != AML_SCOPE_OP)
408 Status = AcpiDsLoad2BeginOp (WalkState, NULL);
412 Status = AcpiDsScopeStackPush (Op->Named.Node,
413 Op->Named.Node->Type, WalkState);
414 if (ACPI_FAILURE (Status))
416 return_ACPI_STATUS (Status);
422 case AML_CLASS_EXECUTE:
423 case AML_CLASS_CREATE:
432 /* Nothing to do here during method execution */
434 return_ACPI_STATUS (Status);
438 Status = AcpiDsMethodError (Status, WalkState);
439 return_ACPI_STATUS (Status);
443 /*****************************************************************************
445 * FUNCTION: AcpiDsExecEndOp
447 * PARAMETERS: WalkState - Current state of the parse tree walk
451 * DESCRIPTION: Ascending callback used during the execution of control
452 * methods. The only thing we really need to do here is to
453 * notice the beginning of IF, ELSE, and WHILE blocks.
455 ****************************************************************************/
459 ACPI_WALK_STATE *WalkState)
461 ACPI_PARSE_OBJECT *Op;
462 ACPI_STATUS Status = AE_OK;
465 ACPI_PARSE_OBJECT *NextOp;
466 ACPI_PARSE_OBJECT *FirstArg;
469 ACPI_FUNCTION_TRACE_PTR (DsExecEndOp, WalkState);
473 OpType = WalkState->OpInfo->Type;
474 OpClass = WalkState->OpInfo->Class;
476 if (OpClass == AML_CLASS_UNKNOWN)
478 ACPI_ERROR ((AE_INFO, "Unknown opcode 0x%X", Op->Common.AmlOpcode));
479 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
482 FirstArg = Op->Common.Value.Arg;
484 /* Init the walk state */
486 WalkState->NumOperands = 0;
487 WalkState->OperandIndex = 0;
488 WalkState->ReturnDesc = NULL;
489 WalkState->ResultObj = NULL;
491 /* Call debugger for single step support (DEBUG build only) */
493 ACPI_DEBUGGER_EXEC (Status = AcpiDbSingleStep (WalkState, Op, OpClass));
494 ACPI_DEBUGGER_EXEC (if (ACPI_FAILURE (Status)) {return_ACPI_STATUS (Status);});
496 /* Decode the Opcode Class */
500 case AML_CLASS_ARGUMENT: /* Constants, literals, etc. */
502 if (WalkState->Opcode == AML_INT_NAMEPATH_OP)
504 Status = AcpiDsEvaluateNamePath (WalkState);
505 if (ACPI_FAILURE (Status))
512 case AML_CLASS_EXECUTE: /* Most operators with arguments */
514 /* Build resolved operand stack */
516 Status = AcpiDsCreateOperands (WalkState, FirstArg);
517 if (ACPI_FAILURE (Status))
523 * All opcodes require operand resolution, with the only exceptions
524 * being the ObjectType and SizeOf operators.
526 if (!(WalkState->OpInfo->Flags & AML_NO_OPERAND_RESOLVE))
528 /* Resolve all operands */
530 Status = AcpiExResolveOperands (WalkState->Opcode,
531 &(WalkState->Operands [WalkState->NumOperands -1]),
535 if (ACPI_SUCCESS (Status))
538 * Dispatch the request to the appropriate interpreter handler
539 * routine. There is one routine per opcode "type" based upon the
540 * number of opcode arguments and return type.
542 Status = AcpiGbl_OpTypeDispatch[OpType] (WalkState);
547 * Treat constructs of the form "Store(LocalX,LocalX)" as noops when the
548 * Local is uninitialized.
550 if ((Status == AE_AML_UNINITIALIZED_LOCAL) &&
551 (WalkState->Opcode == AML_STORE_OP) &&
552 (WalkState->Operands[0]->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
553 (WalkState->Operands[1]->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
554 (WalkState->Operands[0]->Reference.Class ==
555 WalkState->Operands[1]->Reference.Class) &&
556 (WalkState->Operands[0]->Reference.Value ==
557 WalkState->Operands[1]->Reference.Value))
563 ACPI_EXCEPTION ((AE_INFO, Status,
564 "While resolving operands for [%s]",
565 AcpiPsGetOpcodeName (WalkState->Opcode)));
569 /* Always delete the argument objects and clear the operand stack */
571 AcpiDsClearOperands (WalkState);
574 * If a result object was returned from above, push it on the
575 * current result stack
577 if (ACPI_SUCCESS (Status) &&
578 WalkState->ResultObj)
580 Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
588 case AML_TYPE_CONTROL: /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
590 /* 1 Operand, 0 ExternalResult, 0 InternalResult */
592 Status = AcpiDsExecEndControlOp (WalkState, Op);
596 case AML_TYPE_METHOD_CALL:
598 * If the method is referenced from within a package
599 * declaration, it is not a invocation of the method, just
602 if ((Op->Asl.Parent) &&
603 ((Op->Asl.Parent->Asl.AmlOpcode == AML_PACKAGE_OP) ||
604 (Op->Asl.Parent->Asl.AmlOpcode == AML_VAR_PACKAGE_OP)))
606 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
607 "Method Reference in a Package, Op=%p\n", Op));
609 Op->Common.Node = (ACPI_NAMESPACE_NODE *) Op->Asl.Value.Arg->Asl.Node;
610 AcpiUtAddReference (Op->Asl.Value.Arg->Asl.Node->Object);
611 return_ACPI_STATUS (AE_OK);
614 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
615 "Method invocation, Op=%p\n", Op));
618 * (AML_METHODCALL) Op->Asl.Value.Arg->Asl.Node contains
619 * the method Node pointer
621 /* NextOp points to the op that holds the method name */
625 /* NextOp points to first argument op */
627 NextOp = NextOp->Common.Next;
630 * Get the method's arguments and put them on the operand stack
632 Status = AcpiDsCreateOperands (WalkState, NextOp);
633 if (ACPI_FAILURE (Status))
639 * Since the operands will be passed to another control method,
640 * we must resolve all local references here (Local variables,
641 * arguments to *this* method, etc.)
643 Status = AcpiDsResolveOperands (WalkState);
644 if (ACPI_FAILURE (Status))
646 /* On error, clear all resolved operands */
648 AcpiDsClearOperands (WalkState);
653 * Tell the walk loop to preempt this running method and
654 * execute the new method
656 Status = AE_CTRL_TRANSFER;
659 * Return now; we don't want to disturb anything,
660 * especially the operand count!
662 return_ACPI_STATUS (Status);
664 case AML_TYPE_CREATE_FIELD:
666 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
667 "Executing CreateField Buffer/Index Op=%p\n", Op));
669 Status = AcpiDsLoad2EndOp (WalkState);
670 if (ACPI_FAILURE (Status))
675 Status = AcpiDsEvalBufferFieldOperands (WalkState, Op);
679 case AML_TYPE_CREATE_OBJECT:
681 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
682 "Executing CreateObject (Buffer/Package) Op=%p\n", Op));
684 switch (Op->Common.Parent->Common.AmlOpcode)
688 * Put the Node on the object stack (Contains the ACPI Name
691 WalkState->Operands[0] = (void *) Op->Common.Parent->Common.Node;
692 WalkState->NumOperands = 1;
694 Status = AcpiDsCreateNode (WalkState,
695 Op->Common.Parent->Common.Node,
697 if (ACPI_FAILURE (Status))
703 /*lint -fallthrough */
705 case AML_INT_EVAL_SUBTREE_OP:
707 Status = AcpiDsEvalDataObjectOperands (WalkState, Op,
708 AcpiNsGetAttachedObject (Op->Common.Parent->Common.Node));
713 Status = AcpiDsEvalDataObjectOperands (WalkState, Op, NULL);
718 * If a result object was returned from above, push it on the
719 * current result stack
721 if (WalkState->ResultObj)
723 Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
727 case AML_TYPE_NAMED_FIELD:
728 case AML_TYPE_NAMED_COMPLEX:
729 case AML_TYPE_NAMED_SIMPLE:
730 case AML_TYPE_NAMED_NO_OBJ:
732 Status = AcpiDsLoad2EndOp (WalkState);
733 if (ACPI_FAILURE (Status))
738 if (Op->Common.AmlOpcode == AML_REGION_OP)
740 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
741 "Executing OpRegion Address/Length Op=%p\n", Op));
743 Status = AcpiDsEvalRegionOperands (WalkState, Op);
744 if (ACPI_FAILURE (Status))
749 else if (Op->Common.AmlOpcode == AML_DATA_REGION_OP)
751 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
752 "Executing DataTableRegion Strings Op=%p\n", Op));
754 Status = AcpiDsEvalTableRegionOperands (WalkState, Op);
755 if (ACPI_FAILURE (Status))
760 else if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP)
762 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
763 "Executing BankField Op=%p\n", Op));
765 Status = AcpiDsEvalBankFieldOperands (WalkState, Op);
766 if (ACPI_FAILURE (Status))
773 case AML_TYPE_UNDEFINED:
775 ACPI_ERROR ((AE_INFO,
776 "Undefined opcode type Op=%p", Op));
777 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
781 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
782 "Internal opcode=%X type Op=%p\n",
783 WalkState->Opcode, Op));
788 ACPI_ERROR ((AE_INFO,
789 "Unimplemented opcode, class=0x%X type=0x%X Opcode=0x%X Op=%p",
790 OpClass, OpType, Op->Common.AmlOpcode, Op));
792 Status = AE_NOT_IMPLEMENTED;
798 * ACPI 2.0 support for 64-bit integers: Truncate numeric
799 * result value if we are executing from a 32-bit ACPI table
801 (void) AcpiExTruncateFor32bitTable (WalkState->ResultObj);
804 * Check if we just completed the evaluation of a
805 * conditional predicate
807 if ((ACPI_SUCCESS (Status)) &&
808 (WalkState->ControlState) &&
809 (WalkState->ControlState->Common.State ==
810 ACPI_CONTROL_PREDICATE_EXECUTING) &&
811 (WalkState->ControlState->Control.PredicateOp == Op))
813 Status = AcpiDsGetPredicateValue (WalkState, WalkState->ResultObj);
814 WalkState->ResultObj = NULL;
820 if (WalkState->ResultObj)
822 /* Break to debugger to display result */
824 ACPI_DEBUGGER_EXEC (AcpiDbDisplayResultObject (WalkState->ResultObj,
828 * Delete the result op if and only if:
829 * Parent will not use the result -- such as any
830 * non-nested type2 op in a method (parent will be method)
832 AcpiDsDeleteResultIfNotUsed (Op, WalkState->ResultObj, WalkState);
835 #ifdef _UNDER_DEVELOPMENT
837 if (WalkState->ParserState.Aml == WalkState->ParserState.AmlEnd)
839 AcpiDbMethodEnd (WalkState);
843 /* Invoke exception handler on error */
845 if (ACPI_FAILURE (Status))
847 Status = AcpiDsMethodError (Status, WalkState);
850 /* Always clear the object stack */
852 WalkState->NumOperands = 0;
853 return_ACPI_STATUS (Status);