1 /*******************************************************************************
3 * Module Name: dsutils - Dispatcher utilities
6 ******************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2007, 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__
119 #include <contrib/dev/acpica/acpi.h>
120 #include <contrib/dev/acpica/acparser.h>
121 #include <contrib/dev/acpica/amlcode.h>
122 #include <contrib/dev/acpica/acdispat.h>
123 #include <contrib/dev/acpica/acinterp.h>
124 #include <contrib/dev/acpica/acnamesp.h>
125 #include <contrib/dev/acpica/acdebug.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) &&
597 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
599 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", Arg));
601 /* Get the entire name string from the AML stream */
603 Status = AcpiExGetNameString (ACPI_TYPE_ANY, Arg->Common.Value.Buffer,
604 &NameString, &NameLength);
606 if (ACPI_FAILURE (Status))
608 return_ACPI_STATUS (Status);
611 /* All prefixes have been handled, and the name is in NameString */
614 * Special handling for BufferField declarations. This is a deferred
615 * opcode that unfortunately defines the field name as the last
616 * parameter instead of the first. We get here when we are performing
617 * the deferred execution, so the actual name of the field is already
618 * in the namespace. We don't want to attempt to look it up again
619 * because we may be executing in a different scope than where the
620 * actual opcode exists.
622 if ((WalkState->DeferredNode) &&
623 (WalkState->DeferredNode->Type == ACPI_TYPE_BUFFER_FIELD) &&
624 (ArgIndex == (UINT32) ((WalkState->Opcode == AML_CREATE_FIELD_OP) ? 3 : 2)))
626 ObjDesc = ACPI_CAST_PTR (
627 ACPI_OPERAND_OBJECT, WalkState->DeferredNode);
630 else /* All other opcodes */
633 * Differentiate between a namespace "create" operation
634 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
635 * IMODE_EXECUTE) in order to support the creation of
636 * namespace objects during the execution of control methods.
638 ParentOp = Arg->Common.Parent;
639 OpInfo = AcpiPsGetOpcodeInfo (ParentOp->Common.AmlOpcode);
640 if ((OpInfo->Flags & AML_NSNODE) &&
641 (ParentOp->Common.AmlOpcode != AML_INT_METHODCALL_OP) &&
642 (ParentOp->Common.AmlOpcode != AML_REGION_OP) &&
643 (ParentOp->Common.AmlOpcode != AML_INT_NAMEPATH_OP))
645 /* Enter name into namespace if not found */
647 InterpreterMode = ACPI_IMODE_LOAD_PASS2;
651 /* Return a failure if name not found */
653 InterpreterMode = ACPI_IMODE_EXECUTE;
656 Status = AcpiNsLookup (WalkState->ScopeInfo, NameString,
657 ACPI_TYPE_ANY, InterpreterMode,
658 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
660 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ObjDesc));
662 * The only case where we pass through (ignore) a NOT_FOUND
663 * error is for the CondRefOf opcode.
665 if (Status == AE_NOT_FOUND)
667 if (ParentOp->Common.AmlOpcode == AML_COND_REF_OF_OP)
670 * For the Conditional Reference op, it's OK if
671 * the name is not found; We just need a way to
672 * indicate this to the interpreter, set the
675 ObjDesc = ACPI_CAST_PTR (
676 ACPI_OPERAND_OBJECT, AcpiGbl_RootNode);
682 * We just plain didn't find it -- which is a
683 * very serious error at this point
685 Status = AE_AML_NAME_NOT_FOUND;
689 if (ACPI_FAILURE (Status))
691 ACPI_ERROR_NAMESPACE (NameString, Status);
695 /* Free the namestring created above */
697 ACPI_FREE (NameString);
699 /* Check status from the lookup */
701 if (ACPI_FAILURE (Status))
703 return_ACPI_STATUS (Status);
706 /* Put the resulting object onto the current object stack */
708 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
709 if (ACPI_FAILURE (Status))
711 return_ACPI_STATUS (Status);
713 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc, WalkState));
717 /* Check for null name case */
719 if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
720 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
723 * If the name is null, this means that this is an
724 * optional result parameter that was not specified
725 * in the original ASL. Create a Zero Constant for a
726 * placeholder. (Store to a constant is a Noop.)
728 Opcode = AML_ZERO_OP; /* Has no arguments! */
730 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
731 "Null namepath: Arg=%p\n", Arg));
735 Opcode = Arg->Common.AmlOpcode;
738 /* Get the object type of the argument */
740 OpInfo = AcpiPsGetOpcodeInfo (Opcode);
741 if (OpInfo->ObjectType == ACPI_TYPE_INVALID)
743 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
746 if ((OpInfo->Flags & AML_HAS_RETVAL) || (Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
748 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
749 "Argument previously created, already stacked\n"));
751 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (
752 WalkState->Operands [WalkState->NumOperands - 1], WalkState));
755 * Use value that was already previously returned
756 * by the evaluation of this argument
758 Status = AcpiDsResultPop (&ObjDesc, WalkState);
759 if (ACPI_FAILURE (Status))
762 * Only error is underflow, and this indicates
763 * a missing or null operand!
765 ACPI_EXCEPTION ((AE_INFO, Status,
766 "Missing or null operand"));
767 return_ACPI_STATUS (Status);
772 /* Create an ACPI_INTERNAL_OBJECT for the argument */
774 ObjDesc = AcpiUtCreateInternalObject (OpInfo->ObjectType);
777 return_ACPI_STATUS (AE_NO_MEMORY);
780 /* Initialize the new object */
782 Status = AcpiDsInitObjectFromOp (
783 WalkState, Arg, Opcode, &ObjDesc);
784 if (ACPI_FAILURE (Status))
786 AcpiUtDeleteObjectDesc (ObjDesc);
787 return_ACPI_STATUS (Status);
791 /* Put the operand object on the object stack */
793 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
794 if (ACPI_FAILURE (Status))
796 return_ACPI_STATUS (Status);
799 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc, WalkState));
802 return_ACPI_STATUS (AE_OK);
806 /*******************************************************************************
808 * FUNCTION: AcpiDsCreateOperands
810 * PARAMETERS: WalkState - Current state
811 * FirstArg - First argument of a parser argument tree
815 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
816 * namespace objects and place those argument object on the object
817 * stack in preparation for evaluation by the interpreter.
819 ******************************************************************************/
822 AcpiDsCreateOperands (
823 ACPI_WALK_STATE *WalkState,
824 ACPI_PARSE_OBJECT *FirstArg)
826 ACPI_STATUS Status = AE_OK;
827 ACPI_PARSE_OBJECT *Arg;
828 ACPI_PARSE_OBJECT *Arguments[ACPI_OBJ_NUM_OPERANDS];
831 UINT8 Index = WalkState->NumOperands;
835 ACPI_FUNCTION_TRACE_PTR (DsCreateOperands, FirstArg);
838 /* Get all arguments in the list */
843 if (Index >= ACPI_OBJ_NUM_OPERANDS)
845 return_ACPI_STATUS (AE_BAD_DATA);
848 Arguments[Index] = Arg;
849 WalkState->Operands [Index] = NULL;
851 /* Move on to next argument, if any */
853 Arg = Arg->Common.Next;
860 /* It is the appropriate order to get objects from the Result stack */
862 for (i = 0; i < ArgCount; i++)
864 Arg = Arguments[Index];
866 /* Force the filling of the operand stack in inverse order */
868 WalkState->OperandIndex = Index;
870 Status = AcpiDsCreateOperand (WalkState, Arg, Index);
871 if (ACPI_FAILURE (Status))
879 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Arg #%d (%p) done, Arg1=%p\n",
880 Index, Arg, FirstArg));
883 return_ACPI_STATUS (Status);
888 * We must undo everything done above; meaning that we must
889 * pop everything off of the operand stack and delete those
892 AcpiDsObjStackPopAndDelete (ArgCount, WalkState);
894 ACPI_EXCEPTION ((AE_INFO, Status, "While creating Arg %d", Index));
895 return_ACPI_STATUS (Status);
899 /*****************************************************************************
901 * FUNCTION: AcpiDsEvaluateNamePath
903 * PARAMETERS: WalkState - Current state of the parse tree walk,
904 * the opcode of current operation should be
905 * AML_INT_NAMEPATH_OP
909 * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent
910 * interpreter object, convert it to value, if needed, duplicate
911 * it, if needed, and push it onto the current result stack.
913 ****************************************************************************/
916 AcpiDsEvaluateNamePath (
917 ACPI_WALK_STATE *WalkState)
919 ACPI_STATUS Status = AE_OK;
920 ACPI_PARSE_OBJECT *Op = WalkState->Op;
921 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
922 ACPI_OPERAND_OBJECT *NewObjDesc;
926 ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath, WalkState);
929 if (!Op->Common.Parent)
931 /* This happens after certain exception processing */
936 if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
937 (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP) ||
938 (Op->Common.Parent->Common.AmlOpcode == AML_REF_OF_OP))
940 /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */
945 Status = AcpiDsCreateOperand (WalkState, Op, 0);
946 if (ACPI_FAILURE (Status))
951 if (Op->Common.Flags & ACPI_PARSEOP_TARGET)
953 NewObjDesc = *Operand;
957 Type = ACPI_GET_OBJECT_TYPE (*Operand);
959 Status = AcpiExResolveToValue (Operand, WalkState);
960 if (ACPI_FAILURE (Status))
965 if (Type == ACPI_TYPE_INTEGER)
967 /* It was incremented by AcpiExResolveToValue */
969 AcpiUtRemoveReference (*Operand);
971 Status = AcpiUtCopyIobjectToIobject (*Operand, &NewObjDesc, WalkState);
972 if (ACPI_FAILURE (Status))
980 * The object either was anew created or is
981 * a Namespace node - don't decrement it.
983 NewObjDesc = *Operand;
986 /* Cleanup for name-path operand */
988 Status = AcpiDsObjStackPop (1, WalkState);
989 if (ACPI_FAILURE (Status))
991 WalkState->ResultObj = NewObjDesc;
997 WalkState->ResultObj = NewObjDesc;
999 Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
1000 if (ACPI_SUCCESS (Status))
1002 /* Force to take it from stack */
1004 Op->Common.Flags |= ACPI_PARSEOP_IN_STACK;
1009 return_ACPI_STATUS (Status);