1 /*******************************************************************************
3 * Module Name: dsutils - Dispatcher utilities
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <contrib/dev/acpica/include/acpi.h>
45 #include <contrib/dev/acpica/include/accommon.h>
46 #include <contrib/dev/acpica/include/acparser.h>
47 #include <contrib/dev/acpica/include/amlcode.h>
48 #include <contrib/dev/acpica/include/acdispat.h>
49 #include <contrib/dev/acpica/include/acinterp.h>
50 #include <contrib/dev/acpica/include/acnamesp.h>
51 #include <contrib/dev/acpica/include/acdebug.h>
53 #define _COMPONENT ACPI_DISPATCHER
54 ACPI_MODULE_NAME ("dsutils")
57 /*******************************************************************************
59 * FUNCTION: AcpiDsClearImplicitReturn
61 * PARAMETERS: WalkState - Current State
65 * DESCRIPTION: Clear and remove a reference on an implicit return value. Used
66 * to delete "stale" return values (if enabled, the return value
67 * from every operator is saved at least momentarily, in case the
68 * parent method exits.)
70 ******************************************************************************/
73 AcpiDsClearImplicitReturn (
74 ACPI_WALK_STATE *WalkState)
76 ACPI_FUNCTION_NAME (DsClearImplicitReturn);
80 * Slack must be enabled for this feature
82 if (!AcpiGbl_EnableInterpreterSlack)
87 if (WalkState->ImplicitReturnObj)
90 * Delete any "stale" implicit return. However, in
91 * complex statements, the implicit return value can be
92 * bubbled up several levels.
94 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
95 "Removing reference on stale implicit return obj %p\n",
96 WalkState->ImplicitReturnObj));
98 AcpiUtRemoveReference (WalkState->ImplicitReturnObj);
99 WalkState->ImplicitReturnObj = NULL;
104 #ifndef ACPI_NO_METHOD_EXECUTION
105 /*******************************************************************************
107 * FUNCTION: AcpiDsDoImplicitReturn
109 * PARAMETERS: ReturnDesc - The return value
110 * WalkState - Current State
111 * AddReference - True if a reference should be added to the
114 * RETURN: TRUE if implicit return enabled, FALSE otherwise
116 * DESCRIPTION: Implements the optional "implicit return". We save the result
117 * of every ASL operator and control method invocation in case the
118 * parent method exit. Before storing a new return value, we
119 * delete the previous return value.
121 ******************************************************************************/
124 AcpiDsDoImplicitReturn (
125 ACPI_OPERAND_OBJECT *ReturnDesc,
126 ACPI_WALK_STATE *WalkState,
127 BOOLEAN AddReference)
129 ACPI_FUNCTION_NAME (DsDoImplicitReturn);
133 * Slack must be enabled for this feature, and we must
134 * have a valid return object
136 if ((!AcpiGbl_EnableInterpreterSlack) ||
142 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
143 "Result %p will be implicitly returned; Prev=%p\n",
145 WalkState->ImplicitReturnObj));
148 * Delete any "stale" implicit return value first. However, in
149 * complex statements, the implicit return value can be
150 * bubbled up several levels, so we don't clear the value if it
151 * is the same as the ReturnDesc.
153 if (WalkState->ImplicitReturnObj)
155 if (WalkState->ImplicitReturnObj == ReturnDesc)
159 AcpiDsClearImplicitReturn (WalkState);
162 /* Save the implicit return value, add a reference if requested */
164 WalkState->ImplicitReturnObj = ReturnDesc;
167 AcpiUtAddReference (ReturnDesc);
174 /*******************************************************************************
176 * FUNCTION: AcpiDsIsResultUsed
178 * PARAMETERS: Op - Current Op
179 * WalkState - Current State
181 * RETURN: TRUE if result is used, FALSE otherwise
183 * DESCRIPTION: Check if a result object will be used by the parent
185 ******************************************************************************/
189 ACPI_PARSE_OBJECT *Op,
190 ACPI_WALK_STATE *WalkState)
192 const ACPI_OPCODE_INFO *ParentInfo;
194 ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed, Op);
197 /* Must have both an Op and a Result Object */
201 ACPI_ERROR ((AE_INFO, "Null Op"));
206 * We know that this operator is not a
207 * Return() operator (would not come here.) The following code is the
208 * optional support for a so-called "implicit return". Some AML code
209 * assumes that the last value of the method is "implicitly" returned
210 * to the caller. Just save the last result as the return value.
211 * NOTE: this is optional because the ASL language does not actually
212 * support this behavior.
214 (void) AcpiDsDoImplicitReturn (WalkState->ResultObj, WalkState, TRUE);
217 * Now determine if the parent will use the result
219 * If there is no parent, or the parent is a ScopeOp, we are executing
220 * at the method level. An executing method typically has no parent,
221 * since each method is parsed separately. A method invoked externally
222 * via ExecuteControlMethod has a ScopeOp as the parent.
224 if ((!Op->Common.Parent) ||
225 (Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
227 /* No parent, the return value cannot possibly be used */
229 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
230 "At Method level, result of [%s] not used\n",
231 AcpiPsGetOpcodeName (Op->Common.AmlOpcode)));
232 return_UINT8 (FALSE);
235 /* Get info on the parent. The RootOp is AML_SCOPE */
237 ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
238 if (ParentInfo->Class == AML_CLASS_UNKNOWN)
240 ACPI_ERROR ((AE_INFO,
241 "Unknown parent opcode Op=%p", Op));
242 return_UINT8 (FALSE);
246 * Decide what to do with the result based on the parent. If
247 * the parent opcode will not use the result, delete the object.
248 * Otherwise leave it as is, it will be deleted when it is used
249 * as an operand later.
251 switch (ParentInfo->Class)
253 case AML_CLASS_CONTROL:
255 switch (Op->Common.Parent->Common.AmlOpcode)
259 /* Never delete the return value associated with a return opcode */
266 * If we are executing the predicate AND this is the predicate op,
267 * we will use the return value
269 if ((WalkState->ControlState->Common.State ==
270 ACPI_CONTROL_PREDICATE_EXECUTING) &&
271 (WalkState->ControlState->Control.PredicateOp == Op))
279 /* Ignore other control opcodes */
284 /* The general control opcode returns no result */
288 case AML_CLASS_CREATE:
290 * These opcodes allow TermArg(s) as operands and therefore
291 * the operands can be method calls. The result is used.
295 case AML_CLASS_NAMED_OBJECT:
297 if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) ||
298 (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) ||
299 (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
300 (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP) ||
301 (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) ||
302 (Op->Common.Parent->Common.AmlOpcode == AML_INT_EVAL_SUBTREE_OP) ||
303 (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP))
306 * These opcodes allow TermArg(s) as operands and therefore
307 * the operands can be method calls. The result is used.
316 * In all other cases. the parent will actually use the return
317 * object, so keep it.
324 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
325 "Result of [%s] used by Parent [%s] Op=%p\n",
326 AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
327 AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
333 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
334 "Result of [%s] not used by Parent [%s] Op=%p\n",
335 AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
336 AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
338 return_UINT8 (FALSE);
342 /*******************************************************************************
344 * FUNCTION: AcpiDsDeleteResultIfNotUsed
346 * PARAMETERS: Op - Current parse Op
347 * ResultObj - Result of the operation
348 * WalkState - Current state
352 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
353 * result descriptor, check if the parent opcode will actually use
354 * this result. If not, delete the result now so that it will
355 * not become orphaned.
357 ******************************************************************************/
360 AcpiDsDeleteResultIfNotUsed (
361 ACPI_PARSE_OBJECT *Op,
362 ACPI_OPERAND_OBJECT *ResultObj,
363 ACPI_WALK_STATE *WalkState)
365 ACPI_OPERAND_OBJECT *ObjDesc;
369 ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed, ResultObj);
374 ACPI_ERROR ((AE_INFO, "Null Op"));
383 if (!AcpiDsIsResultUsed (Op, WalkState))
385 /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
387 Status = AcpiDsResultPop (&ObjDesc, WalkState);
388 if (ACPI_SUCCESS (Status))
390 AcpiUtRemoveReference (ResultObj);
398 /*******************************************************************************
400 * FUNCTION: AcpiDsResolveOperands
402 * PARAMETERS: WalkState - Current walk state with operands on stack
406 * DESCRIPTION: Resolve all operands to their values. Used to prepare
407 * arguments to a control method invocation (a call from one
408 * method to another.)
410 ******************************************************************************/
413 AcpiDsResolveOperands (
414 ACPI_WALK_STATE *WalkState)
417 ACPI_STATUS Status = AE_OK;
420 ACPI_FUNCTION_TRACE_PTR (DsResolveOperands, WalkState);
424 * Attempt to resolve each of the valid operands
425 * Method arguments are passed by reference, not by value. This means
426 * that the actual objects are passed, not copies of the objects.
428 for (i = 0; i < WalkState->NumOperands; i++)
430 Status = AcpiExResolveToValue (&WalkState->Operands[i], WalkState);
431 if (ACPI_FAILURE (Status))
437 return_ACPI_STATUS (Status);
441 /*******************************************************************************
443 * FUNCTION: AcpiDsClearOperands
445 * PARAMETERS: WalkState - Current walk state with operands on stack
449 * DESCRIPTION: Clear all operands on the current walk state operand stack.
451 ******************************************************************************/
454 AcpiDsClearOperands (
455 ACPI_WALK_STATE *WalkState)
460 ACPI_FUNCTION_TRACE_PTR (DsClearOperands, WalkState);
463 /* Remove a reference on each operand on the stack */
465 for (i = 0; i < WalkState->NumOperands; i++)
468 * Remove a reference to all operands, including both
469 * "Arguments" and "Targets".
471 AcpiUtRemoveReference (WalkState->Operands[i]);
472 WalkState->Operands[i] = NULL;
475 WalkState->NumOperands = 0;
481 /*******************************************************************************
483 * FUNCTION: AcpiDsCreateOperand
485 * PARAMETERS: WalkState - Current walk state
486 * Arg - Parse object for the argument
487 * ArgIndex - Which argument (zero based)
491 * DESCRIPTION: Translate a parse tree object that is an argument to an AML
492 * opcode to the equivalent interpreter object. This may include
493 * looking up a name or entering a new name into the internal
496 ******************************************************************************/
499 AcpiDsCreateOperand (
500 ACPI_WALK_STATE *WalkState,
501 ACPI_PARSE_OBJECT *Arg,
504 ACPI_STATUS Status = AE_OK;
507 ACPI_OPERAND_OBJECT *ObjDesc;
508 ACPI_PARSE_OBJECT *ParentOp;
510 ACPI_INTERPRETER_MODE InterpreterMode;
511 const ACPI_OPCODE_INFO *OpInfo;
514 ACPI_FUNCTION_TRACE_PTR (DsCreateOperand, Arg);
517 /* A valid name must be looked up in the namespace */
519 if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
520 (Arg->Common.Value.String) &&
521 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
523 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", Arg));
525 /* Get the entire name string from the AML stream */
527 Status = AcpiExGetNameString (ACPI_TYPE_ANY,
528 Arg->Common.Value.Buffer, &NameString, &NameLength);
530 if (ACPI_FAILURE (Status))
532 return_ACPI_STATUS (Status);
535 /* All prefixes have been handled, and the name is in NameString */
538 * Special handling for BufferField declarations. This is a deferred
539 * opcode that unfortunately defines the field name as the last
540 * parameter instead of the first. We get here when we are performing
541 * the deferred execution, so the actual name of the field is already
542 * in the namespace. We don't want to attempt to look it up again
543 * because we may be executing in a different scope than where the
544 * actual opcode exists.
546 if ((WalkState->DeferredNode) &&
547 (WalkState->DeferredNode->Type == ACPI_TYPE_BUFFER_FIELD) &&
548 (ArgIndex == (UINT32)
549 ((WalkState->Opcode == AML_CREATE_FIELD_OP) ? 3 : 2)))
551 ObjDesc = ACPI_CAST_PTR (
552 ACPI_OPERAND_OBJECT, WalkState->DeferredNode);
555 else /* All other opcodes */
558 * Differentiate between a namespace "create" operation
559 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
560 * IMODE_EXECUTE) in order to support the creation of
561 * namespace objects during the execution of control methods.
563 ParentOp = Arg->Common.Parent;
564 OpInfo = AcpiPsGetOpcodeInfo (ParentOp->Common.AmlOpcode);
566 if ((OpInfo->Flags & AML_NSNODE) &&
567 (ParentOp->Common.AmlOpcode != AML_INT_METHODCALL_OP) &&
568 (ParentOp->Common.AmlOpcode != AML_REGION_OP) &&
569 (ParentOp->Common.AmlOpcode != AML_INT_NAMEPATH_OP))
571 /* Enter name into namespace if not found */
573 InterpreterMode = ACPI_IMODE_LOAD_PASS2;
577 /* Return a failure if name not found */
579 InterpreterMode = ACPI_IMODE_EXECUTE;
582 Status = AcpiNsLookup (WalkState->ScopeInfo, NameString,
583 ACPI_TYPE_ANY, InterpreterMode,
584 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, WalkState,
585 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ObjDesc));
587 * The only case where we pass through (ignore) a NOT_FOUND
588 * error is for the CondRefOf opcode.
590 if (Status == AE_NOT_FOUND)
592 if (ParentOp->Common.AmlOpcode == AML_COND_REF_OF_OP)
595 * For the Conditional Reference op, it's OK if
596 * the name is not found; We just need a way to
597 * indicate this to the interpreter, set the
600 ObjDesc = ACPI_CAST_PTR (
601 ACPI_OPERAND_OBJECT, AcpiGbl_RootNode);
604 else if (ParentOp->Common.AmlOpcode == AML_EXTERNAL_OP)
607 * This opcode should never appear here. It is used only
608 * by AML disassemblers and is surrounded by an If(0)
609 * by the ASL compiler.
611 * Therefore, if we see it here, it is a serious error.
613 Status = AE_AML_BAD_OPCODE;
618 * We just plain didn't find it -- which is a
619 * very serious error at this point
621 Status = AE_AML_NAME_NOT_FOUND;
625 if (ACPI_FAILURE (Status))
627 ACPI_ERROR_NAMESPACE (NameString, Status);
631 /* Free the namestring created above */
633 ACPI_FREE (NameString);
635 /* Check status from the lookup */
637 if (ACPI_FAILURE (Status))
639 return_ACPI_STATUS (Status);
642 /* Put the resulting object onto the current object stack */
644 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
645 if (ACPI_FAILURE (Status))
647 return_ACPI_STATUS (Status);
650 AcpiDbDisplayArgumentObject (ObjDesc, WalkState);
654 /* Check for null name case */
656 if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
657 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
660 * If the name is null, this means that this is an
661 * optional result parameter that was not specified
662 * in the original ASL. Create a Zero Constant for a
663 * placeholder. (Store to a constant is a Noop.)
665 Opcode = AML_ZERO_OP; /* Has no arguments! */
667 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
668 "Null namepath: Arg=%p\n", Arg));
672 Opcode = Arg->Common.AmlOpcode;
675 /* Get the object type of the argument */
677 OpInfo = AcpiPsGetOpcodeInfo (Opcode);
678 if (OpInfo->ObjectType == ACPI_TYPE_INVALID)
680 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
683 if ((OpInfo->Flags & AML_HAS_RETVAL) ||
684 (Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
686 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
687 "Argument previously created, already stacked\n"));
689 AcpiDbDisplayArgumentObject (
690 WalkState->Operands [WalkState->NumOperands - 1], WalkState);
693 * Use value that was already previously returned
694 * by the evaluation of this argument
696 Status = AcpiDsResultPop (&ObjDesc, WalkState);
697 if (ACPI_FAILURE (Status))
700 * Only error is underflow, and this indicates
701 * a missing or null operand!
703 ACPI_EXCEPTION ((AE_INFO, Status,
704 "Missing or null operand"));
705 return_ACPI_STATUS (Status);
710 /* Create an ACPI_INTERNAL_OBJECT for the argument */
712 ObjDesc = AcpiUtCreateInternalObject (OpInfo->ObjectType);
715 return_ACPI_STATUS (AE_NO_MEMORY);
718 /* Initialize the new object */
720 Status = AcpiDsInitObjectFromOp (
721 WalkState, Arg, Opcode, &ObjDesc);
722 if (ACPI_FAILURE (Status))
724 AcpiUtDeleteObjectDesc (ObjDesc);
725 return_ACPI_STATUS (Status);
729 /* Put the operand object on the object stack */
731 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
732 if (ACPI_FAILURE (Status))
734 return_ACPI_STATUS (Status);
737 AcpiDbDisplayArgumentObject (ObjDesc, WalkState);
740 return_ACPI_STATUS (AE_OK);
744 /*******************************************************************************
746 * FUNCTION: AcpiDsCreateOperands
748 * PARAMETERS: WalkState - Current state
749 * FirstArg - First argument of a parser argument tree
753 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
754 * namespace objects and place those argument object on the object
755 * stack in preparation for evaluation by the interpreter.
757 ******************************************************************************/
760 AcpiDsCreateOperands (
761 ACPI_WALK_STATE *WalkState,
762 ACPI_PARSE_OBJECT *FirstArg)
764 ACPI_STATUS Status = AE_OK;
765 ACPI_PARSE_OBJECT *Arg;
766 ACPI_PARSE_OBJECT *Arguments[ACPI_OBJ_NUM_OPERANDS];
768 UINT32 Index = WalkState->NumOperands;
772 ACPI_FUNCTION_TRACE_PTR (DsCreateOperands, FirstArg);
775 /* Get all arguments in the list */
780 if (Index >= ACPI_OBJ_NUM_OPERANDS)
782 return_ACPI_STATUS (AE_BAD_DATA);
785 Arguments[Index] = Arg;
786 WalkState->Operands [Index] = NULL;
788 /* Move on to next argument, if any */
790 Arg = Arg->Common.Next;
795 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
796 "NumOperands %d, ArgCount %d, Index %d\n",
797 WalkState->NumOperands, ArgCount, Index));
799 /* Create the interpreter arguments, in reverse order */
802 for (i = 0; i < ArgCount; i++)
804 Arg = Arguments[Index];
805 WalkState->OperandIndex = (UINT8) Index;
807 Status = AcpiDsCreateOperand (WalkState, Arg, Index);
808 if (ACPI_FAILURE (Status))
813 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
814 "Created Arg #%u (%p) %u args total\n",
815 Index, Arg, ArgCount));
819 return_ACPI_STATUS (Status);
824 * We must undo everything done above; meaning that we must
825 * pop everything off of the operand stack and delete those
828 AcpiDsObjStackPopAndDelete (ArgCount, WalkState);
830 ACPI_EXCEPTION ((AE_INFO, Status, "While creating Arg %u", Index));
831 return_ACPI_STATUS (Status);
835 /*****************************************************************************
837 * FUNCTION: AcpiDsEvaluateNamePath
839 * PARAMETERS: WalkState - Current state of the parse tree walk,
840 * the opcode of current operation should be
841 * AML_INT_NAMEPATH_OP
845 * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent
846 * interpreter object, convert it to value, if needed, duplicate
847 * it, if needed, and push it onto the current result stack.
849 ****************************************************************************/
852 AcpiDsEvaluateNamePath (
853 ACPI_WALK_STATE *WalkState)
855 ACPI_STATUS Status = AE_OK;
856 ACPI_PARSE_OBJECT *Op = WalkState->Op;
857 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
858 ACPI_OPERAND_OBJECT *NewObjDesc;
862 ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath, WalkState);
865 if (!Op->Common.Parent)
867 /* This happens after certain exception processing */
872 if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
873 (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP) ||
874 (Op->Common.Parent->Common.AmlOpcode == AML_REF_OF_OP))
876 /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */
881 Status = AcpiDsCreateOperand (WalkState, Op, 0);
882 if (ACPI_FAILURE (Status))
887 if (Op->Common.Flags & ACPI_PARSEOP_TARGET)
889 NewObjDesc = *Operand;
893 Type = (*Operand)->Common.Type;
895 Status = AcpiExResolveToValue (Operand, WalkState);
896 if (ACPI_FAILURE (Status))
901 if (Type == ACPI_TYPE_INTEGER)
903 /* It was incremented by AcpiExResolveToValue */
905 AcpiUtRemoveReference (*Operand);
907 Status = AcpiUtCopyIobjectToIobject (
908 *Operand, &NewObjDesc, WalkState);
909 if (ACPI_FAILURE (Status))
917 * The object either was anew created or is
918 * a Namespace node - don't decrement it.
920 NewObjDesc = *Operand;
923 /* Cleanup for name-path operand */
925 Status = AcpiDsObjStackPop (1, WalkState);
926 if (ACPI_FAILURE (Status))
928 WalkState->ResultObj = NewObjDesc;
934 WalkState->ResultObj = NewObjDesc;
936 Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
937 if (ACPI_SUCCESS (Status))
939 /* Force to take it from stack */
941 Op->Common.Flags |= ACPI_PARSEOP_IN_STACK;
946 return_ACPI_STATUS (Status);