1 /******************************************************************************
3 * Module Name: dswstate - Dispatcher parse tree walk management routines
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
12 * All rights reserved.
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
37 * The above copyright and patent license is granted only if the following
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
72 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
80 * 4. Disclaimer and Export Compliance
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
114 *****************************************************************************/
117 #define __DSWSTATE_C__
120 #include "accommon.h"
121 #include "acparser.h"
122 #include "acdispat.h"
123 #include "acnamesp.h"
125 #define _COMPONENT ACPI_DISPATCHER
126 ACPI_MODULE_NAME ("dswstate")
128 /* Local prototypes */
131 AcpiDsResultStackPush (
132 ACPI_WALK_STATE
*WalkState
);
135 AcpiDsResultStackPop (
136 ACPI_WALK_STATE
*WalkState
);
139 /*******************************************************************************
141 * FUNCTION: AcpiDsResultPop
143 * PARAMETERS: Object - Where to return the popped object
144 * WalkState - Current Walk state
148 * DESCRIPTION: Pop an object off the top of this walk's result stack
150 ******************************************************************************/
154 ACPI_OPERAND_OBJECT
**Object
,
155 ACPI_WALK_STATE
*WalkState
)
158 ACPI_GENERIC_STATE
*State
;
162 ACPI_FUNCTION_NAME (DsResultPop
);
165 State
= WalkState
->Results
;
167 /* Incorrect state of result stack */
169 if (State
&& !WalkState
->ResultCount
)
171 ACPI_ERROR ((AE_INFO
, "No results on result stack"));
172 return (AE_AML_INTERNAL
);
175 if (!State
&& WalkState
->ResultCount
)
177 ACPI_ERROR ((AE_INFO
, "No result state for result stack"));
178 return (AE_AML_INTERNAL
);
181 /* Empty result stack */
185 ACPI_ERROR ((AE_INFO
, "Result stack is empty! State=%p", WalkState
));
186 return (AE_AML_NO_RETURN_VALUE
);
189 /* Return object of the top element and clean that top element result stack */
191 WalkState
->ResultCount
--;
192 Index
= (UINT32
) WalkState
->ResultCount
% ACPI_RESULTS_FRAME_OBJ_NUM
;
194 *Object
= State
->Results
.ObjDesc
[Index
];
197 ACPI_ERROR ((AE_INFO
, "No result objects on result stack, State=%p",
199 return (AE_AML_NO_RETURN_VALUE
);
202 State
->Results
.ObjDesc
[Index
] = NULL
;
205 Status
= AcpiDsResultStackPop (WalkState
);
206 if (ACPI_FAILURE (Status
))
212 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
,
213 "Obj=%p [%s] Index=%X State=%p Num=%X\n", *Object
,
214 AcpiUtGetObjectTypeName (*Object
),
215 Index
, WalkState
, WalkState
->ResultCount
));
221 /*******************************************************************************
223 * FUNCTION: AcpiDsResultPush
225 * PARAMETERS: Object - Where to return the popped object
226 * WalkState - Current Walk state
230 * DESCRIPTION: Push an object onto the current result stack
232 ******************************************************************************/
236 ACPI_OPERAND_OBJECT
*Object
,
237 ACPI_WALK_STATE
*WalkState
)
239 ACPI_GENERIC_STATE
*State
;
244 ACPI_FUNCTION_NAME (DsResultPush
);
247 if (WalkState
->ResultCount
> WalkState
->ResultSize
)
249 ACPI_ERROR ((AE_INFO
, "Result stack is full"));
250 return (AE_AML_INTERNAL
);
252 else if (WalkState
->ResultCount
== WalkState
->ResultSize
)
254 /* Extend the result stack */
256 Status
= AcpiDsResultStackPush (WalkState
);
257 if (ACPI_FAILURE (Status
))
259 ACPI_ERROR ((AE_INFO
, "Failed to extend the result stack"));
264 if (!(WalkState
->ResultCount
< WalkState
->ResultSize
))
266 ACPI_ERROR ((AE_INFO
, "No free elements in result stack"));
267 return (AE_AML_INTERNAL
);
270 State
= WalkState
->Results
;
273 ACPI_ERROR ((AE_INFO
, "No result stack frame during push"));
274 return (AE_AML_INTERNAL
);
279 ACPI_ERROR ((AE_INFO
,
280 "Null Object! Obj=%p State=%p Num=%u",
281 Object
, WalkState
, WalkState
->ResultCount
));
282 return (AE_BAD_PARAMETER
);
285 /* Assign the address of object to the top free element of result stack */
287 Index
= (UINT32
) WalkState
->ResultCount
% ACPI_RESULTS_FRAME_OBJ_NUM
;
288 State
->Results
.ObjDesc
[Index
] = Object
;
289 WalkState
->ResultCount
++;
291 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
292 Object
, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT
*) Object
),
293 WalkState
, WalkState
->ResultCount
, WalkState
->CurrentResult
));
299 /*******************************************************************************
301 * FUNCTION: AcpiDsResultStackPush
303 * PARAMETERS: WalkState - Current Walk state
307 * DESCRIPTION: Push an object onto the WalkState result stack
309 ******************************************************************************/
312 AcpiDsResultStackPush (
313 ACPI_WALK_STATE
*WalkState
)
315 ACPI_GENERIC_STATE
*State
;
318 ACPI_FUNCTION_NAME (DsResultStackPush
);
321 /* Check for stack overflow */
323 if (((UINT32
) WalkState
->ResultSize
+ ACPI_RESULTS_FRAME_OBJ_NUM
) >
324 ACPI_RESULTS_OBJ_NUM_MAX
)
326 ACPI_ERROR ((AE_INFO
, "Result stack overflow: State=%p Num=%u",
327 WalkState
, WalkState
->ResultSize
));
328 return (AE_STACK_OVERFLOW
);
331 State
= AcpiUtCreateGenericState ();
334 return (AE_NO_MEMORY
);
337 State
->Common
.DescriptorType
= ACPI_DESC_TYPE_STATE_RESULT
;
338 AcpiUtPushGenericState (&WalkState
->Results
, State
);
340 /* Increase the length of the result stack by the length of frame */
342 WalkState
->ResultSize
+= ACPI_RESULTS_FRAME_OBJ_NUM
;
344 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Results=%p State=%p\n",
351 /*******************************************************************************
353 * FUNCTION: AcpiDsResultStackPop
355 * PARAMETERS: WalkState - Current Walk state
359 * DESCRIPTION: Pop an object off of the WalkState result stack
361 ******************************************************************************/
364 AcpiDsResultStackPop (
365 ACPI_WALK_STATE
*WalkState
)
367 ACPI_GENERIC_STATE
*State
;
370 ACPI_FUNCTION_NAME (DsResultStackPop
);
373 /* Check for stack underflow */
375 if (WalkState
->Results
== NULL
)
377 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Result stack underflow - State=%p\n",
379 return (AE_AML_NO_OPERAND
);
382 if (WalkState
->ResultSize
< ACPI_RESULTS_FRAME_OBJ_NUM
)
384 ACPI_ERROR ((AE_INFO
, "Insufficient result stack size"));
385 return (AE_AML_INTERNAL
);
388 State
= AcpiUtPopGenericState (&WalkState
->Results
);
389 AcpiUtDeleteGenericState (State
);
391 /* Decrease the length of result stack by the length of frame */
393 WalkState
->ResultSize
-= ACPI_RESULTS_FRAME_OBJ_NUM
;
395 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
,
396 "Result=%p RemainingResults=%X State=%p\n",
397 State
, WalkState
->ResultCount
, WalkState
));
403 /*******************************************************************************
405 * FUNCTION: AcpiDsObjStackPush
407 * PARAMETERS: Object - Object to push
408 * WalkState - Current Walk state
412 * DESCRIPTION: Push an object onto this walk's object/operand stack
414 ******************************************************************************/
419 ACPI_WALK_STATE
*WalkState
)
421 ACPI_FUNCTION_NAME (DsObjStackPush
);
424 /* Check for stack overflow */
426 if (WalkState
->NumOperands
>= ACPI_OBJ_NUM_OPERANDS
)
428 ACPI_ERROR ((AE_INFO
,
429 "Object stack overflow! Obj=%p State=%p #Ops=%u",
430 Object
, WalkState
, WalkState
->NumOperands
));
431 return (AE_STACK_OVERFLOW
);
434 /* Put the object onto the stack */
436 WalkState
->Operands
[WalkState
->OperandIndex
] = Object
;
437 WalkState
->NumOperands
++;
439 /* For the usual order of filling the operand stack */
441 WalkState
->OperandIndex
++;
443 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Obj=%p [%s] State=%p #Ops=%X\n",
444 Object
, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT
*) Object
),
445 WalkState
, WalkState
->NumOperands
));
451 /*******************************************************************************
453 * FUNCTION: AcpiDsObjStackPop
455 * PARAMETERS: PopCount - Number of objects/entries to pop
456 * WalkState - Current Walk state
460 * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
461 * deleted by this routine.
463 ******************************************************************************/
468 ACPI_WALK_STATE
*WalkState
)
473 ACPI_FUNCTION_NAME (DsObjStackPop
);
476 for (i
= 0; i
< PopCount
; i
++)
478 /* Check for stack underflow */
480 if (WalkState
->NumOperands
== 0)
482 ACPI_ERROR ((AE_INFO
,
483 "Object stack underflow! Count=%X State=%p #Ops=%u",
484 PopCount
, WalkState
, WalkState
->NumOperands
));
485 return (AE_STACK_UNDERFLOW
);
488 /* Just set the stack entry to null */
490 WalkState
->NumOperands
--;
491 WalkState
->Operands
[WalkState
->NumOperands
] = NULL
;
494 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Count=%X State=%p #Ops=%u\n",
495 PopCount
, WalkState
, WalkState
->NumOperands
));
501 /*******************************************************************************
503 * FUNCTION: AcpiDsObjStackPopAndDelete
505 * PARAMETERS: PopCount - Number of objects/entries to pop
506 * WalkState - Current Walk state
510 * DESCRIPTION: Pop this walk's object stack and delete each object that is
513 ******************************************************************************/
516 AcpiDsObjStackPopAndDelete (
518 ACPI_WALK_STATE
*WalkState
)
521 ACPI_OPERAND_OBJECT
*ObjDesc
;
524 ACPI_FUNCTION_NAME (DsObjStackPopAndDelete
);
532 for (i
= (INT32
) PopCount
- 1; i
>= 0; i
--)
534 if (WalkState
->NumOperands
== 0)
539 /* Pop the stack and delete an object if present in this stack entry */
541 WalkState
->NumOperands
--;
542 ObjDesc
= WalkState
->Operands
[i
];
545 AcpiUtRemoveReference (WalkState
->Operands
[i
]);
546 WalkState
->Operands
[i
] = NULL
;
550 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC
, "Count=%X State=%p #Ops=%X\n",
551 PopCount
, WalkState
, WalkState
->NumOperands
));
555 /*******************************************************************************
557 * FUNCTION: AcpiDsGetCurrentWalkState
559 * PARAMETERS: Thread - Get current active state for this Thread
561 * RETURN: Pointer to the current walk state
563 * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
566 ******************************************************************************/
569 AcpiDsGetCurrentWalkState (
570 ACPI_THREAD_STATE
*Thread
)
572 ACPI_FUNCTION_NAME (DsGetCurrentWalkState
);
580 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE
, "Current WalkState %p\n",
581 Thread
->WalkStateList
));
583 return (Thread
->WalkStateList
);
587 /*******************************************************************************
589 * FUNCTION: AcpiDsPushWalkState
591 * PARAMETERS: WalkState - State to push
592 * Thread - Thread state object
596 * DESCRIPTION: Place the Thread state at the head of the state list
598 ******************************************************************************/
601 AcpiDsPushWalkState (
602 ACPI_WALK_STATE
*WalkState
,
603 ACPI_THREAD_STATE
*Thread
)
605 ACPI_FUNCTION_TRACE (DsPushWalkState
);
608 WalkState
->Next
= Thread
->WalkStateList
;
609 Thread
->WalkStateList
= WalkState
;
615 /*******************************************************************************
617 * FUNCTION: AcpiDsPopWalkState
619 * PARAMETERS: Thread - Current thread state
621 * RETURN: A WalkState object popped from the thread's stack
623 * DESCRIPTION: Remove and return the walkstate object that is at the head of
624 * the walk stack for the given walk list. NULL indicates that
627 ******************************************************************************/
631 ACPI_THREAD_STATE
*Thread
)
633 ACPI_WALK_STATE
*WalkState
;
636 ACPI_FUNCTION_TRACE (DsPopWalkState
);
639 WalkState
= Thread
->WalkStateList
;
643 /* Next walk state becomes the current walk state */
645 Thread
->WalkStateList
= WalkState
->Next
;
648 * Don't clear the NEXT field, this serves as an indicator
649 * that there is a parent WALK STATE
650 * Do Not: WalkState->Next = NULL;
654 return_PTR (WalkState
);
658 /*******************************************************************************
660 * FUNCTION: AcpiDsCreateWalkState
662 * PARAMETERS: OwnerId - ID for object creation
663 * Origin - Starting point for this walk
664 * MethodDesc - Method object
665 * Thread - Current thread state
667 * RETURN: Pointer to the new walk state.
669 * DESCRIPTION: Allocate and initialize a new walk state. The current walk
670 * state is set to this new state.
672 ******************************************************************************/
675 AcpiDsCreateWalkState (
676 ACPI_OWNER_ID OwnerId
,
677 ACPI_PARSE_OBJECT
*Origin
,
678 ACPI_OPERAND_OBJECT
*MethodDesc
,
679 ACPI_THREAD_STATE
*Thread
)
681 ACPI_WALK_STATE
*WalkState
;
684 ACPI_FUNCTION_TRACE (DsCreateWalkState
);
687 WalkState
= ACPI_ALLOCATE_ZEROED (sizeof (ACPI_WALK_STATE
));
693 WalkState
->DescriptorType
= ACPI_DESC_TYPE_WALK
;
694 WalkState
->MethodDesc
= MethodDesc
;
695 WalkState
->OwnerId
= OwnerId
;
696 WalkState
->Origin
= Origin
;
697 WalkState
->Thread
= Thread
;
699 WalkState
->ParserState
.StartOp
= Origin
;
701 /* Init the method args/local */
703 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
704 AcpiDsMethodDataInit (WalkState
);
707 /* Put the new state at the head of the walk list */
711 AcpiDsPushWalkState (WalkState
, Thread
);
714 return_PTR (WalkState
);
718 /*******************************************************************************
720 * FUNCTION: AcpiDsInitAmlWalk
722 * PARAMETERS: WalkState - New state to be initialized
723 * Op - Current parse op
724 * MethodNode - Control method NS node, if any
725 * AmlStart - Start of AML
726 * AmlLength - Length of AML
727 * Info - Method info block (params, etc.)
728 * PassNumber - 1, 2, or 3
732 * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
734 ******************************************************************************/
738 ACPI_WALK_STATE
*WalkState
,
739 ACPI_PARSE_OBJECT
*Op
,
740 ACPI_NAMESPACE_NODE
*MethodNode
,
743 ACPI_EVALUATE_INFO
*Info
,
747 ACPI_PARSE_STATE
*ParserState
= &WalkState
->ParserState
;
748 ACPI_PARSE_OBJECT
*ExtraOp
;
751 ACPI_FUNCTION_TRACE (DsInitAmlWalk
);
754 WalkState
->ParserState
.Aml
=
755 WalkState
->ParserState
.AmlStart
= AmlStart
;
756 WalkState
->ParserState
.AmlEnd
=
757 WalkState
->ParserState
.PkgEnd
= AmlStart
+ AmlLength
;
759 /* The NextOp of the NextWalk will be the beginning of the method */
761 WalkState
->NextOp
= NULL
;
762 WalkState
->PassNumber
= PassNumber
;
766 WalkState
->Params
= Info
->Parameters
;
767 WalkState
->CallerReturnDesc
= &Info
->ReturnObject
;
770 Status
= AcpiPsInitScope (&WalkState
->ParserState
, Op
);
771 if (ACPI_FAILURE (Status
))
773 return_ACPI_STATUS (Status
);
778 WalkState
->ParserState
.StartNode
= MethodNode
;
779 WalkState
->WalkType
= ACPI_WALK_METHOD
;
780 WalkState
->MethodNode
= MethodNode
;
781 WalkState
->MethodDesc
= AcpiNsGetAttachedObject (MethodNode
);
783 /* Push start scope on scope stack and make it current */
785 Status
= AcpiDsScopeStackPush (MethodNode
, ACPI_TYPE_METHOD
, WalkState
);
786 if (ACPI_FAILURE (Status
))
788 return_ACPI_STATUS (Status
);
791 /* Init the method arguments */
793 Status
= AcpiDsMethodDataInitArgs (WalkState
->Params
,
794 ACPI_METHOD_NUM_ARGS
, WalkState
);
795 if (ACPI_FAILURE (Status
))
797 return_ACPI_STATUS (Status
);
803 * Setup the current scope.
804 * Find a Named Op that has a namespace node associated with it.
805 * search upwards from this Op. Current scope is the first
806 * Op with a namespace node.
808 ExtraOp
= ParserState
->StartOp
;
809 while (ExtraOp
&& !ExtraOp
->Common
.Node
)
811 ExtraOp
= ExtraOp
->Common
.Parent
;
816 ParserState
->StartNode
= NULL
;
820 ParserState
->StartNode
= ExtraOp
->Common
.Node
;
823 if (ParserState
->StartNode
)
825 /* Push start scope on scope stack and make it current */
827 Status
= AcpiDsScopeStackPush (ParserState
->StartNode
,
828 ParserState
->StartNode
->Type
, WalkState
);
829 if (ACPI_FAILURE (Status
))
831 return_ACPI_STATUS (Status
);
836 Status
= AcpiDsInitCallbacks (WalkState
, PassNumber
);
837 return_ACPI_STATUS (Status
);
841 /*******************************************************************************
843 * FUNCTION: AcpiDsDeleteWalkState
845 * PARAMETERS: WalkState - State to delete
849 * DESCRIPTION: Delete a walk state including all internal data structures
851 ******************************************************************************/
854 AcpiDsDeleteWalkState (
855 ACPI_WALK_STATE
*WalkState
)
857 ACPI_GENERIC_STATE
*State
;
860 ACPI_FUNCTION_TRACE_PTR (DsDeleteWalkState
, WalkState
);
868 if (WalkState
->DescriptorType
!= ACPI_DESC_TYPE_WALK
)
870 ACPI_ERROR ((AE_INFO
, "%p is not a valid walk state",
875 /* There should not be any open scopes */
877 if (WalkState
->ParserState
.Scope
)
879 ACPI_ERROR ((AE_INFO
, "%p walk still has a scope list",
881 AcpiPsCleanupScope (&WalkState
->ParserState
);
884 /* Always must free any linked control states */
886 while (WalkState
->ControlState
)
888 State
= WalkState
->ControlState
;
889 WalkState
->ControlState
= State
->Common
.Next
;
891 AcpiUtDeleteGenericState (State
);
894 /* Always must free any linked parse states */
896 while (WalkState
->ScopeInfo
)
898 State
= WalkState
->ScopeInfo
;
899 WalkState
->ScopeInfo
= State
->Common
.Next
;
901 AcpiUtDeleteGenericState (State
);
904 /* Always must free any stacked result states */
906 while (WalkState
->Results
)
908 State
= WalkState
->Results
;
909 WalkState
->Results
= State
->Common
.Next
;
911 AcpiUtDeleteGenericState (State
);
914 ACPI_FREE (WalkState
);