1 /*******************************************************************************
3 * Module Name: dsutils - Dispatcher utilities
6 ******************************************************************************/
8 /******************************************************************************
12 * Some or all of this work - Copyright (c) 1999 - 2005, 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
180 /*******************************************************************************
182 * FUNCTION: AcpiDsDoImplicitReturn
184 * PARAMETERS: ReturnDesc - The return value
185 * WalkState - Current State
186 * AddReference - True if a reference should be added to the
189 * RETURN: TRUE if implicit return enabled, FALSE otherwise
191 * DESCRIPTION: Implements the optional "implicit return". We save the result
192 * of every ASL operator and control method invocation in case the
193 * parent method exit. Before storing a new return value, we
194 * delete the previous return value.
196 ******************************************************************************/
199 AcpiDsDoImplicitReturn (
200 ACPI_OPERAND_OBJECT
*ReturnDesc
,
201 ACPI_WALK_STATE
*WalkState
,
202 BOOLEAN AddReference
)
204 ACPI_FUNCTION_NAME ("DsDoImplicitReturn");
208 * Slack must be enabled for this feature, and we must
209 * have a valid return object
211 if ((!AcpiGbl_EnableInterpreterSlack
) ||
217 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
218 "Result %p will be implicitly returned; Prev=%p\n",
220 WalkState
->ImplicitReturnObj
));
223 * Delete any "stale" implicit return value first. However, in
224 * complex statements, the implicit return value can be
225 * bubbled up several levels, so we don't clear the value if it
226 * is the same as the ReturnDesc.
228 if (WalkState
->ImplicitReturnObj
)
230 if (WalkState
->ImplicitReturnObj
== ReturnDesc
)
234 AcpiDsClearImplicitReturn (WalkState
);
237 /* Save the implicit return value, add a reference if requested */
239 WalkState
->ImplicitReturnObj
= ReturnDesc
;
242 AcpiUtAddReference (ReturnDesc
);
249 /*******************************************************************************
251 * FUNCTION: AcpiDsIsResultUsed
253 * PARAMETERS: Op - Current Op
254 * WalkState - Current State
256 * RETURN: TRUE if result is used, FALSE otherwise
258 * DESCRIPTION: Check if a result object will be used by the parent
260 ******************************************************************************/
264 ACPI_PARSE_OBJECT
*Op
,
265 ACPI_WALK_STATE
*WalkState
)
267 const ACPI_OPCODE_INFO
*ParentInfo
;
269 ACPI_FUNCTION_TRACE_PTR ("DsIsResultUsed", Op
);
272 /* Must have both an Op and a Result Object */
276 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR
, "Null Op\n"));
281 * We know that this operator is not a
282 * Return() operator (would not come here.) The following code is the
283 * optional support for a so-called "implicit return". Some AML code
284 * assumes that the last value of the method is "implicitly" returned
285 * to the caller. Just save the last result as the return value.
286 * NOTE: this is optional because the ASL language does not actually
287 * support this behavior.
289 AcpiDsDoImplicitReturn (WalkState
->ResultObj
, WalkState
, TRUE
);
292 * Now determine if the parent will use the result
294 * If there is no parent, or the parent is a ScopeOp, we are executing
295 * at the method level. An executing method typically has no parent,
296 * since each method is parsed separately. A method invoked externally
297 * via ExecuteControlMethod has a ScopeOp as the parent.
299 if ((!Op
->Common
.Parent
) ||
300 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_SCOPE_OP
))
302 /* No parent, the return value cannot possibly be used */
304 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "At Method level, result of [%s] not used\n",
305 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
)));
306 return_VALUE (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_DEBUG_PRINT ((ACPI_DB_ERROR
, "Unknown parent opcode. Op=%p\n", Op
));
315 return_VALUE (FALSE
);
319 * Decide what to do with the result based on the parent. If
320 * the parent opcode will not use the result, delete the object.
321 * Otherwise leave it as is, it will be deleted when it is used
322 * as an operand later.
324 switch (ParentInfo
->Class
)
326 case AML_CLASS_CONTROL
:
328 switch (Op
->Common
.Parent
->Common
.AmlOpcode
)
332 /* Never delete the return value associated with a return opcode */
340 * If we are executing the predicate AND this is the predicate op,
341 * we will use the return value
343 if ((WalkState
->ControlState
->Common
.State
== ACPI_CONTROL_PREDICATE_EXECUTING
) &&
344 (WalkState
->ControlState
->Control
.PredicateOp
== Op
))
351 /* Ignore other control opcodes */
355 /* The general control opcode returns no result */
360 case AML_CLASS_CREATE
:
363 * These opcodes allow TermArg(s) as operands and therefore
364 * the operands can be method calls. The result is used.
369 case AML_CLASS_NAMED_OBJECT
:
371 if ((Op
->Common
.Parent
->Common
.AmlOpcode
== AML_REGION_OP
) ||
372 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_DATA_REGION_OP
) ||
373 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_PACKAGE_OP
) ||
374 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_VAR_PACKAGE_OP
) ||
375 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_BUFFER_OP
) ||
376 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_INT_EVAL_SUBTREE_OP
))
379 * These opcodes allow TermArg(s) as operands and therefore
380 * the operands can be method calls. The result is used.
391 * In all other cases. the parent will actually use the return
392 * object, so keep it.
399 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Result of [%s] used by Parent [%s] Op=%p\n",
400 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
401 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
407 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Result of [%s] not used by Parent [%s] Op=%p\n",
408 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
409 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
411 return_VALUE (FALSE
);
415 /*******************************************************************************
417 * FUNCTION: AcpiDsDeleteResultIfNotUsed
419 * PARAMETERS: Op - Current parse Op
420 * ResultObj - Result of the operation
421 * WalkState - Current state
425 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
426 * result descriptor, check if the parent opcode will actually use
427 * this result. If not, delete the result now so that it will
428 * not become orphaned.
430 ******************************************************************************/
433 AcpiDsDeleteResultIfNotUsed (
434 ACPI_PARSE_OBJECT
*Op
,
435 ACPI_OPERAND_OBJECT
*ResultObj
,
436 ACPI_WALK_STATE
*WalkState
)
438 ACPI_OPERAND_OBJECT
*ObjDesc
;
442 ACPI_FUNCTION_TRACE_PTR ("DsDeleteResultIfNotUsed", ResultObj
);
447 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR
, "Null Op\n"));
456 if (!AcpiDsIsResultUsed (Op
, WalkState
))
458 /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
460 Status
= AcpiDsResultPop (&ObjDesc
, WalkState
);
461 if (ACPI_SUCCESS (Status
))
463 AcpiUtRemoveReference (ResultObj
);
471 /*******************************************************************************
473 * FUNCTION: AcpiDsResolveOperands
475 * PARAMETERS: WalkState - Current walk state with operands on stack
479 * DESCRIPTION: Resolve all operands to their values. Used to prepare
480 * arguments to a control method invocation (a call from one
481 * method to another.)
483 ******************************************************************************/
486 AcpiDsResolveOperands (
487 ACPI_WALK_STATE
*WalkState
)
490 ACPI_STATUS Status
= AE_OK
;
493 ACPI_FUNCTION_TRACE_PTR ("DsResolveOperands", WalkState
);
497 * Attempt to resolve each of the valid operands
498 * Method arguments are passed by reference, not by value. This means
499 * that the actual objects are passed, not copies of the objects.
501 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
503 Status
= AcpiExResolveToValue (&WalkState
->Operands
[i
], WalkState
);
504 if (ACPI_FAILURE (Status
))
510 return_ACPI_STATUS (Status
);
514 /*******************************************************************************
516 * FUNCTION: AcpiDsClearOperands
518 * PARAMETERS: WalkState - Current walk state with operands on stack
522 * DESCRIPTION: Clear all operands on the current walk state operand stack.
524 ******************************************************************************/
527 AcpiDsClearOperands (
528 ACPI_WALK_STATE
*WalkState
)
533 ACPI_FUNCTION_TRACE_PTR ("DsClearOperands", WalkState
);
536 /* Remove a reference on each operand on the stack */
538 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
541 * Remove a reference to all operands, including both
542 * "Arguments" and "Targets".
544 AcpiUtRemoveReference (WalkState
->Operands
[i
]);
545 WalkState
->Operands
[i
] = NULL
;
548 WalkState
->NumOperands
= 0;
554 /*******************************************************************************
556 * FUNCTION: AcpiDsCreateOperand
558 * PARAMETERS: WalkState - Current walk state
559 * Arg - Parse object for the argument
560 * ArgIndex - Which argument (zero based)
564 * DESCRIPTION: Translate a parse tree object that is an argument to an AML
565 * opcode to the equivalent interpreter object. This may include
566 * looking up a name or entering a new name into the internal
569 ******************************************************************************/
572 AcpiDsCreateOperand (
573 ACPI_WALK_STATE
*WalkState
,
574 ACPI_PARSE_OBJECT
*Arg
,
577 ACPI_STATUS Status
= AE_OK
;
580 ACPI_OPERAND_OBJECT
*ObjDesc
;
581 ACPI_PARSE_OBJECT
*ParentOp
;
583 ACPI_INTERPRETER_MODE InterpreterMode
;
584 const ACPI_OPCODE_INFO
*OpInfo
;
587 ACPI_FUNCTION_TRACE_PTR ("DsCreateOperand", Arg
);
590 /* A valid name must be looked up in the namespace */
592 if ((Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
) &&
593 (Arg
->Common
.Value
.String
))
595 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Getting a name: Arg=%p\n", Arg
));
597 /* Get the entire name string from the AML stream */
599 Status
= AcpiExGetNameString (ACPI_TYPE_ANY
, Arg
->Common
.Value
.Buffer
,
600 &NameString
, &NameLength
);
602 if (ACPI_FAILURE (Status
))
604 return_ACPI_STATUS (Status
);
607 /* All prefixes have been handled, and the name is in NameString */
610 * Special handling for BufferField declarations. This is a deferred
611 * opcode that unfortunately defines the field name as the last
612 * parameter instead of the first. We get here when we are performing
613 * the deferred execution, so the actual name of the field is already
614 * in the namespace. We don't want to attempt to look it up again
615 * because we may be executing in a different scope than where the
616 * actual opcode exists.
618 if ((WalkState
->DeferredNode
) &&
619 (WalkState
->DeferredNode
->Type
== ACPI_TYPE_BUFFER_FIELD
) &&
622 ObjDesc
= ACPI_CAST_PTR (ACPI_OPERAND_OBJECT
, WalkState
->DeferredNode
);
625 else /* All other opcodes */
628 * Differentiate between a namespace "create" operation
629 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
630 * IMODE_EXECUTE) in order to support the creation of
631 * namespace objects during the execution of control methods.
633 ParentOp
= Arg
->Common
.Parent
;
634 OpInfo
= AcpiPsGetOpcodeInfo (ParentOp
->Common
.AmlOpcode
);
635 if ((OpInfo
->Flags
& AML_NSNODE
) &&
636 (ParentOp
->Common
.AmlOpcode
!= AML_INT_METHODCALL_OP
) &&
637 (ParentOp
->Common
.AmlOpcode
!= AML_REGION_OP
) &&
638 (ParentOp
->Common
.AmlOpcode
!= AML_INT_NAMEPATH_OP
))
640 /* Enter name into namespace if not found */
642 InterpreterMode
= ACPI_IMODE_LOAD_PASS2
;
646 /* Return a failure if name not found */
648 InterpreterMode
= ACPI_IMODE_EXECUTE
;
651 Status
= AcpiNsLookup (WalkState
->ScopeInfo
, NameString
,
652 ACPI_TYPE_ANY
, InterpreterMode
,
653 ACPI_NS_SEARCH_PARENT
| ACPI_NS_DONT_OPEN_SCOPE
,
655 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE
, &ObjDesc
));
657 * The only case where we pass through (ignore) a NOT_FOUND
658 * error is for the CondRefOf opcode.
660 if (Status
== AE_NOT_FOUND
)
662 if (ParentOp
->Common
.AmlOpcode
== AML_COND_REF_OF_OP
)
665 * For the Conditional Reference op, it's OK if
666 * the name is not found; We just need a way to
667 * indicate this to the interpreter, set the
670 ObjDesc
= ACPI_CAST_PTR (ACPI_OPERAND_OBJECT
, AcpiGbl_RootNode
);
676 * We just plain didn't find it -- which is a
677 * very serious error at this point
679 Status
= AE_AML_NAME_NOT_FOUND
;
683 if (ACPI_FAILURE (Status
))
685 ACPI_REPORT_NSERROR (NameString
, Status
);
689 /* Free the namestring created above */
691 ACPI_MEM_FREE (NameString
);
693 /* Check status from the lookup */
695 if (ACPI_FAILURE (Status
))
697 return_ACPI_STATUS (Status
);
700 /* Put the resulting object onto the current object stack */
702 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
703 if (ACPI_FAILURE (Status
))
705 return_ACPI_STATUS (Status
);
707 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
));
711 /* Check for null name case */
713 if (Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
)
716 * If the name is null, this means that this is an
717 * optional result parameter that was not specified
718 * in the original ASL. Create a Zero Constant for a
719 * placeholder. (Store to a constant is a Noop.)
721 Opcode
= AML_ZERO_OP
; /* Has no arguments! */
723 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Null namepath: Arg=%p\n", Arg
));
727 Opcode
= Arg
->Common
.AmlOpcode
;
730 /* Get the object type of the argument */
732 OpInfo
= AcpiPsGetOpcodeInfo (Opcode
);
733 if (OpInfo
->ObjectType
== ACPI_TYPE_INVALID
)
735 return_ACPI_STATUS (AE_NOT_IMPLEMENTED
);
738 if (OpInfo
->Flags
& AML_HAS_RETVAL
)
740 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
741 "Argument previously created, already stacked \n"));
743 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (
744 WalkState
->Operands
[WalkState
->NumOperands
- 1], WalkState
));
747 * Use value that was already previously returned
748 * by the evaluation of this argument
750 Status
= AcpiDsResultPopFromBottom (&ObjDesc
, WalkState
);
751 if (ACPI_FAILURE (Status
))
754 * Only error is underflow, and this indicates
755 * a missing or null operand!
757 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR
, "Missing or null operand, %s\n",
758 AcpiFormatException (Status
)));
759 return_ACPI_STATUS (Status
);
764 /* Create an ACPI_INTERNAL_OBJECT for the argument */
766 ObjDesc
= AcpiUtCreateInternalObject (OpInfo
->ObjectType
);
769 return_ACPI_STATUS (AE_NO_MEMORY
);
772 /* Initialize the new object */
774 Status
= AcpiDsInitObjectFromOp (WalkState
, Arg
,
776 if (ACPI_FAILURE (Status
))
778 AcpiUtDeleteObjectDesc (ObjDesc
);
779 return_ACPI_STATUS (Status
);
783 /* Put the operand object on the object stack */
785 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
786 if (ACPI_FAILURE (Status
))
788 return_ACPI_STATUS (Status
);
791 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
));
794 return_ACPI_STATUS (AE_OK
);
798 /*******************************************************************************
800 * FUNCTION: AcpiDsCreateOperands
802 * PARAMETERS: WalkState - Current state
803 * FirstArg - First argument of a parser argument tree
807 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
808 * namespace objects and place those argument object on the object
809 * stack in preparation for evaluation by the interpreter.
811 ******************************************************************************/
814 AcpiDsCreateOperands (
815 ACPI_WALK_STATE
*WalkState
,
816 ACPI_PARSE_OBJECT
*FirstArg
)
818 ACPI_STATUS Status
= AE_OK
;
819 ACPI_PARSE_OBJECT
*Arg
;
823 ACPI_FUNCTION_TRACE_PTR ("DsCreateOperands", FirstArg
);
826 /* For all arguments in the list... */
831 Status
= AcpiDsCreateOperand (WalkState
, Arg
, ArgCount
);
832 if (ACPI_FAILURE (Status
))
837 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Arg #%d (%p) done, Arg1=%p\n",
838 ArgCount
, Arg
, FirstArg
));
840 /* Move on to next argument, if any */
842 Arg
= Arg
->Common
.Next
;
846 return_ACPI_STATUS (Status
);
851 * We must undo everything done above; meaning that we must
852 * pop everything off of the operand stack and delete those
855 (void) AcpiDsObjStackPopAndDelete (ArgCount
, WalkState
);
857 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR
, "While creating Arg %d - %s\n",
858 (ArgCount
+ 1), AcpiFormatException (Status
)));
859 return_ACPI_STATUS (Status
);