1 /*******************************************************************************
3 * Module Name: dsutils - Dispatcher utilities
6 ******************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2006, 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 *****************************************************************************/
117 #define __DSUTILS_C__
120 #include "acparser.h"
122 #include "acdispat.h"
123 #include "acinterp.h"
124 #include "acnamesp.h"
127 #define _COMPONENT ACPI_DISPATCHER
128 ACPI_MODULE_NAME ("dsutils")
131 /*******************************************************************************
133 * FUNCTION: AcpiDsClearImplicitReturn
135 * PARAMETERS: WalkState - Current State
139 * DESCRIPTION: Clear and remove a reference on an implicit return value. Used
140 * to delete "stale" return values (if enabled, the return value
141 * from every operator is saved at least momentarily, in case the
142 * parent method exits.)
144 ******************************************************************************/
147 AcpiDsClearImplicitReturn (
148 ACPI_WALK_STATE
*WalkState
)
150 ACPI_FUNCTION_NAME (DsClearImplicitReturn
);
154 * Slack must be enabled for this feature
156 if (!AcpiGbl_EnableInterpreterSlack
)
161 if (WalkState
->ImplicitReturnObj
)
164 * Delete any "stale" implicit return. However, in
165 * complex statements, the implicit return value can be
166 * bubbled up several levels.
168 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
169 "Removing reference on stale implicit return obj %p\n",
170 WalkState
->ImplicitReturnObj
));
172 AcpiUtRemoveReference (WalkState
->ImplicitReturnObj
);
173 WalkState
->ImplicitReturnObj
= NULL
;
178 #ifndef ACPI_NO_METHOD_EXECUTION
179 /*******************************************************************************
181 * FUNCTION: AcpiDsDoImplicitReturn
183 * PARAMETERS: ReturnDesc - The return value
184 * WalkState - Current State
185 * AddReference - True if a reference should be added to the
188 * RETURN: TRUE if implicit return enabled, FALSE otherwise
190 * DESCRIPTION: Implements the optional "implicit return". We save the result
191 * of every ASL operator and control method invocation in case the
192 * parent method exit. Before storing a new return value, we
193 * delete the previous return value.
195 ******************************************************************************/
198 AcpiDsDoImplicitReturn (
199 ACPI_OPERAND_OBJECT
*ReturnDesc
,
200 ACPI_WALK_STATE
*WalkState
,
201 BOOLEAN AddReference
)
203 ACPI_FUNCTION_NAME (DsDoImplicitReturn
);
207 * Slack must be enabled for this feature, and we must
208 * have a valid return object
210 if ((!AcpiGbl_EnableInterpreterSlack
) ||
216 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
217 "Result %p will be implicitly returned; Prev=%p\n",
219 WalkState
->ImplicitReturnObj
));
222 * Delete any "stale" implicit return value first. However, in
223 * complex statements, the implicit return value can be
224 * bubbled up several levels, so we don't clear the value if it
225 * is the same as the ReturnDesc.
227 if (WalkState
->ImplicitReturnObj
)
229 if (WalkState
->ImplicitReturnObj
== ReturnDesc
)
233 AcpiDsClearImplicitReturn (WalkState
);
236 /* Save the implicit return value, add a reference if requested */
238 WalkState
->ImplicitReturnObj
= ReturnDesc
;
241 AcpiUtAddReference (ReturnDesc
);
248 /*******************************************************************************
250 * FUNCTION: AcpiDsIsResultUsed
252 * PARAMETERS: Op - Current Op
253 * WalkState - Current State
255 * RETURN: TRUE if result is used, FALSE otherwise
257 * DESCRIPTION: Check if a result object will be used by the parent
259 ******************************************************************************/
263 ACPI_PARSE_OBJECT
*Op
,
264 ACPI_WALK_STATE
*WalkState
)
266 const ACPI_OPCODE_INFO
*ParentInfo
;
268 ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed
, Op
);
271 /* Must have both an Op and a Result Object */
275 ACPI_ERROR ((AE_INFO
, "Null Op"));
280 * We know that this operator is not a
281 * Return() operator (would not come here.) The following code is the
282 * optional support for a so-called "implicit return". Some AML code
283 * assumes that the last value of the method is "implicitly" returned
284 * to the caller. Just save the last result as the return value.
285 * NOTE: this is optional because the ASL language does not actually
286 * support this behavior.
288 (void) AcpiDsDoImplicitReturn (WalkState
->ResultObj
, WalkState
, TRUE
);
291 * Now determine if the parent will use the result
293 * If there is no parent, or the parent is a ScopeOp, we are executing
294 * at the method level. An executing method typically has no parent,
295 * since each method is parsed separately. A method invoked externally
296 * via ExecuteControlMethod has a ScopeOp as the parent.
298 if ((!Op
->Common
.Parent
) ||
299 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_SCOPE_OP
))
301 /* No parent, the return value cannot possibly be used */
303 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
304 "At Method level, result of [%s] not used\n",
305 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
)));
306 return_UINT8 (FALSE
);
309 /* Get info on the parent. The RootOp is AML_SCOPE */
311 ParentInfo
= AcpiPsGetOpcodeInfo (Op
->Common
.Parent
->Common
.AmlOpcode
);
312 if (ParentInfo
->Class
== AML_CLASS_UNKNOWN
)
314 ACPI_ERROR ((AE_INFO
,
315 "Unknown parent opcode Op=%p", Op
));
316 return_UINT8 (FALSE
);
320 * Decide what to do with the result based on the parent. If
321 * the parent opcode will not use the result, delete the object.
322 * Otherwise leave it as is, it will be deleted when it is used
323 * as an operand later.
325 switch (ParentInfo
->Class
)
327 case AML_CLASS_CONTROL
:
329 switch (Op
->Common
.Parent
->Common
.AmlOpcode
)
333 /* Never delete the return value associated with a return opcode */
341 * If we are executing the predicate AND this is the predicate op,
342 * we will use the return value
344 if ((WalkState
->ControlState
->Common
.State
== ACPI_CONTROL_PREDICATE_EXECUTING
) &&
345 (WalkState
->ControlState
->Control
.PredicateOp
== Op
))
352 /* Ignore other control opcodes */
356 /* The general control opcode returns no result */
361 case AML_CLASS_CREATE
:
364 * These opcodes allow TermArg(s) as operands and therefore
365 * the operands can be method calls. The result is used.
370 case AML_CLASS_NAMED_OBJECT
:
372 if ((Op
->Common
.Parent
->Common
.AmlOpcode
== AML_REGION_OP
) ||
373 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_DATA_REGION_OP
) ||
374 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_PACKAGE_OP
) ||
375 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_VAR_PACKAGE_OP
) ||
376 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_BUFFER_OP
) ||
377 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_INT_EVAL_SUBTREE_OP
))
380 * These opcodes allow TermArg(s) as operands and therefore
381 * the operands can be method calls. The result is used.
392 * In all other cases. the parent will actually use the return
393 * object, so keep it.
400 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
401 "Result of [%s] used by Parent [%s] Op=%p\n",
402 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
403 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
409 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
410 "Result of [%s] not used by Parent [%s] Op=%p\n",
411 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
412 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
414 return_UINT8 (FALSE
);
418 /*******************************************************************************
420 * FUNCTION: AcpiDsDeleteResultIfNotUsed
422 * PARAMETERS: Op - Current parse Op
423 * ResultObj - Result of the operation
424 * WalkState - Current state
428 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
429 * result descriptor, check if the parent opcode will actually use
430 * this result. If not, delete the result now so that it will
431 * not become orphaned.
433 ******************************************************************************/
436 AcpiDsDeleteResultIfNotUsed (
437 ACPI_PARSE_OBJECT
*Op
,
438 ACPI_OPERAND_OBJECT
*ResultObj
,
439 ACPI_WALK_STATE
*WalkState
)
441 ACPI_OPERAND_OBJECT
*ObjDesc
;
445 ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed
, ResultObj
);
450 ACPI_ERROR ((AE_INFO
, "Null Op"));
459 if (!AcpiDsIsResultUsed (Op
, WalkState
))
461 /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
463 Status
= AcpiDsResultPop (&ObjDesc
, WalkState
);
464 if (ACPI_SUCCESS (Status
))
466 AcpiUtRemoveReference (ResultObj
);
474 /*******************************************************************************
476 * FUNCTION: AcpiDsResolveOperands
478 * PARAMETERS: WalkState - Current walk state with operands on stack
482 * DESCRIPTION: Resolve all operands to their values. Used to prepare
483 * arguments to a control method invocation (a call from one
484 * method to another.)
486 ******************************************************************************/
489 AcpiDsResolveOperands (
490 ACPI_WALK_STATE
*WalkState
)
493 ACPI_STATUS Status
= AE_OK
;
496 ACPI_FUNCTION_TRACE_PTR (DsResolveOperands
, WalkState
);
500 * Attempt to resolve each of the valid operands
501 * Method arguments are passed by reference, not by value. This means
502 * that the actual objects are passed, not copies of the objects.
504 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
506 Status
= AcpiExResolveToValue (&WalkState
->Operands
[i
], WalkState
);
507 if (ACPI_FAILURE (Status
))
513 return_ACPI_STATUS (Status
);
517 /*******************************************************************************
519 * FUNCTION: AcpiDsClearOperands
521 * PARAMETERS: WalkState - Current walk state with operands on stack
525 * DESCRIPTION: Clear all operands on the current walk state operand stack.
527 ******************************************************************************/
530 AcpiDsClearOperands (
531 ACPI_WALK_STATE
*WalkState
)
536 ACPI_FUNCTION_TRACE_PTR (DsClearOperands
, WalkState
);
539 /* Remove a reference on each operand on the stack */
541 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
544 * Remove a reference to all operands, including both
545 * "Arguments" and "Targets".
547 AcpiUtRemoveReference (WalkState
->Operands
[i
]);
548 WalkState
->Operands
[i
] = NULL
;
551 WalkState
->NumOperands
= 0;
557 /*******************************************************************************
559 * FUNCTION: AcpiDsCreateOperand
561 * PARAMETERS: WalkState - Current walk state
562 * Arg - Parse object for the argument
563 * ArgIndex - Which argument (zero based)
567 * DESCRIPTION: Translate a parse tree object that is an argument to an AML
568 * opcode to the equivalent interpreter object. This may include
569 * looking up a name or entering a new name into the internal
572 ******************************************************************************/
575 AcpiDsCreateOperand (
576 ACPI_WALK_STATE
*WalkState
,
577 ACPI_PARSE_OBJECT
*Arg
,
580 ACPI_STATUS Status
= AE_OK
;
583 ACPI_OPERAND_OBJECT
*ObjDesc
;
584 ACPI_PARSE_OBJECT
*ParentOp
;
586 ACPI_INTERPRETER_MODE InterpreterMode
;
587 const ACPI_OPCODE_INFO
*OpInfo
;
590 ACPI_FUNCTION_TRACE_PTR (DsCreateOperand
, Arg
);
593 /* A valid name must be looked up in the namespace */
595 if ((Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
) &&
596 (Arg
->Common
.Value
.String
))
598 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Getting a name: Arg=%p\n", Arg
));
600 /* Get the entire name string from the AML stream */
602 Status
= AcpiExGetNameString (ACPI_TYPE_ANY
, Arg
->Common
.Value
.Buffer
,
603 &NameString
, &NameLength
);
605 if (ACPI_FAILURE (Status
))
607 return_ACPI_STATUS (Status
);
610 /* All prefixes have been handled, and the name is in NameString */
613 * Special handling for BufferField declarations. This is a deferred
614 * opcode that unfortunately defines the field name as the last
615 * parameter instead of the first. We get here when we are performing
616 * the deferred execution, so the actual name of the field is already
617 * in the namespace. We don't want to attempt to look it up again
618 * because we may be executing in a different scope than where the
619 * actual opcode exists.
621 if ((WalkState
->DeferredNode
) &&
622 (WalkState
->DeferredNode
->Type
== ACPI_TYPE_BUFFER_FIELD
) &&
623 (ArgIndex
== (UINT32
) ((WalkState
->Opcode
== AML_CREATE_FIELD_OP
) ? 3 : 2)))
625 ObjDesc
= ACPI_CAST_PTR (
626 ACPI_OPERAND_OBJECT
, WalkState
->DeferredNode
);
629 else /* All other opcodes */
632 * Differentiate between a namespace "create" operation
633 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
634 * IMODE_EXECUTE) in order to support the creation of
635 * namespace objects during the execution of control methods.
637 ParentOp
= Arg
->Common
.Parent
;
638 OpInfo
= AcpiPsGetOpcodeInfo (ParentOp
->Common
.AmlOpcode
);
639 if ((OpInfo
->Flags
& AML_NSNODE
) &&
640 (ParentOp
->Common
.AmlOpcode
!= AML_INT_METHODCALL_OP
) &&
641 (ParentOp
->Common
.AmlOpcode
!= AML_REGION_OP
) &&
642 (ParentOp
->Common
.AmlOpcode
!= AML_INT_NAMEPATH_OP
))
644 /* Enter name into namespace if not found */
646 InterpreterMode
= ACPI_IMODE_LOAD_PASS2
;
650 /* Return a failure if name not found */
652 InterpreterMode
= ACPI_IMODE_EXECUTE
;
655 Status
= AcpiNsLookup (WalkState
->ScopeInfo
, NameString
,
656 ACPI_TYPE_ANY
, InterpreterMode
,
657 ACPI_NS_SEARCH_PARENT
| ACPI_NS_DONT_OPEN_SCOPE
,
659 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE
, &ObjDesc
));
661 * The only case where we pass through (ignore) a NOT_FOUND
662 * error is for the CondRefOf opcode.
664 if (Status
== AE_NOT_FOUND
)
666 if (ParentOp
->Common
.AmlOpcode
== AML_COND_REF_OF_OP
)
669 * For the Conditional Reference op, it's OK if
670 * the name is not found; We just need a way to
671 * indicate this to the interpreter, set the
674 ObjDesc
= ACPI_CAST_PTR (
675 ACPI_OPERAND_OBJECT
, AcpiGbl_RootNode
);
681 * We just plain didn't find it -- which is a
682 * very serious error at this point
684 Status
= AE_AML_NAME_NOT_FOUND
;
688 if (ACPI_FAILURE (Status
))
690 ACPI_ERROR_NAMESPACE (NameString
, Status
);
694 /* Free the namestring created above */
696 ACPI_FREE (NameString
);
698 /* Check status from the lookup */
700 if (ACPI_FAILURE (Status
))
702 return_ACPI_STATUS (Status
);
705 /* Put the resulting object onto the current object stack */
707 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
708 if (ACPI_FAILURE (Status
))
710 return_ACPI_STATUS (Status
);
712 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
));
716 /* Check for null name case */
718 if (Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
)
721 * If the name is null, this means that this is an
722 * optional result parameter that was not specified
723 * in the original ASL. Create a Zero Constant for a
724 * placeholder. (Store to a constant is a Noop.)
726 Opcode
= AML_ZERO_OP
; /* Has no arguments! */
728 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
729 "Null namepath: Arg=%p\n", Arg
));
733 Opcode
= Arg
->Common
.AmlOpcode
;
736 /* Get the object type of the argument */
738 OpInfo
= AcpiPsGetOpcodeInfo (Opcode
);
739 if (OpInfo
->ObjectType
== ACPI_TYPE_INVALID
)
741 return_ACPI_STATUS (AE_NOT_IMPLEMENTED
);
744 if (OpInfo
->Flags
& AML_HAS_RETVAL
)
746 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
747 "Argument previously created, already stacked\n"));
749 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (
750 WalkState
->Operands
[WalkState
->NumOperands
- 1], WalkState
));
753 * Use value that was already previously returned
754 * by the evaluation of this argument
756 Status
= AcpiDsResultPopFromBottom (&ObjDesc
, WalkState
);
757 if (ACPI_FAILURE (Status
))
760 * Only error is underflow, and this indicates
761 * a missing or null operand!
763 ACPI_EXCEPTION ((AE_INFO
, Status
,
764 "Missing or null operand"));
765 return_ACPI_STATUS (Status
);
770 /* Create an ACPI_INTERNAL_OBJECT for the argument */
772 ObjDesc
= AcpiUtCreateInternalObject (OpInfo
->ObjectType
);
775 return_ACPI_STATUS (AE_NO_MEMORY
);
778 /* Initialize the new object */
780 Status
= AcpiDsInitObjectFromOp (
781 WalkState
, Arg
, Opcode
, &ObjDesc
);
782 if (ACPI_FAILURE (Status
))
784 AcpiUtDeleteObjectDesc (ObjDesc
);
785 return_ACPI_STATUS (Status
);
789 /* Put the operand object on the object stack */
791 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
792 if (ACPI_FAILURE (Status
))
794 return_ACPI_STATUS (Status
);
797 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
));
800 return_ACPI_STATUS (AE_OK
);
804 /*******************************************************************************
806 * FUNCTION: AcpiDsCreateOperands
808 * PARAMETERS: WalkState - Current state
809 * FirstArg - First argument of a parser argument tree
813 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
814 * namespace objects and place those argument object on the object
815 * stack in preparation for evaluation by the interpreter.
817 ******************************************************************************/
820 AcpiDsCreateOperands (
821 ACPI_WALK_STATE
*WalkState
,
822 ACPI_PARSE_OBJECT
*FirstArg
)
824 ACPI_STATUS Status
= AE_OK
;
825 ACPI_PARSE_OBJECT
*Arg
;
829 ACPI_FUNCTION_TRACE_PTR (DsCreateOperands
, FirstArg
);
832 /* For all arguments in the list... */
837 Status
= AcpiDsCreateOperand (WalkState
, Arg
, ArgCount
);
838 if (ACPI_FAILURE (Status
))
843 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Arg #%d (%p) done, Arg1=%p\n",
844 ArgCount
, Arg
, FirstArg
));
846 /* Move on to next argument, if any */
848 Arg
= Arg
->Common
.Next
;
852 return_ACPI_STATUS (Status
);
857 * We must undo everything done above; meaning that we must
858 * pop everything off of the operand stack and delete those
861 (void) AcpiDsObjStackPopAndDelete (ArgCount
, WalkState
);
863 ACPI_EXCEPTION ((AE_INFO
, Status
, "While creating Arg %d",
865 return_ACPI_STATUS (Status
);