1 /*******************************************************************************
3 * Module Name: dsutils - Dispatcher utilities
5 ******************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
37 * The above copyright and patent license is granted only if the following
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
72 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
80 * 4. Disclaimer and Export Compliance
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
114 *****************************************************************************
116 * Alternatively, you may choose to be licensed under the terms of the
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
150 *****************************************************************************/
153 #include "accommon.h"
154 #include "acparser.h"
156 #include "acdispat.h"
157 #include "acinterp.h"
158 #include "acnamesp.h"
161 #define _COMPONENT ACPI_DISPATCHER
162 ACPI_MODULE_NAME ("dsutils")
165 /*******************************************************************************
167 * FUNCTION: AcpiDsClearImplicitReturn
169 * PARAMETERS: WalkState - Current State
173 * DESCRIPTION: Clear and remove a reference on an implicit return value. Used
174 * to delete "stale" return values (if enabled, the return value
175 * from every operator is saved at least momentarily, in case the
176 * parent method exits.)
178 ******************************************************************************/
181 AcpiDsClearImplicitReturn (
182 ACPI_WALK_STATE
*WalkState
)
184 ACPI_FUNCTION_NAME (DsClearImplicitReturn
);
188 * Slack must be enabled for this feature
190 if (!AcpiGbl_EnableInterpreterSlack
)
195 if (WalkState
->ImplicitReturnObj
)
198 * Delete any "stale" implicit return. However, in
199 * complex statements, the implicit return value can be
200 * bubbled up several levels.
202 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
203 "Removing reference on stale implicit return obj %p\n",
204 WalkState
->ImplicitReturnObj
));
206 AcpiUtRemoveReference (WalkState
->ImplicitReturnObj
);
207 WalkState
->ImplicitReturnObj
= NULL
;
212 /*******************************************************************************
214 * FUNCTION: AcpiDsDoImplicitReturn
216 * PARAMETERS: ReturnDesc - The return value
217 * WalkState - Current State
218 * AddReference - True if a reference should be added to the
221 * RETURN: TRUE if implicit return enabled, FALSE otherwise
223 * DESCRIPTION: Implements the optional "implicit return". We save the result
224 * of every ASL operator and control method invocation in case the
225 * parent method exit. Before storing a new return value, we
226 * delete the previous return value.
228 ******************************************************************************/
231 AcpiDsDoImplicitReturn (
232 ACPI_OPERAND_OBJECT
*ReturnDesc
,
233 ACPI_WALK_STATE
*WalkState
,
234 BOOLEAN AddReference
)
236 ACPI_FUNCTION_NAME (DsDoImplicitReturn
);
240 * Slack must be enabled for this feature, and we must
241 * have a valid return object
243 if ((!AcpiGbl_EnableInterpreterSlack
) ||
249 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
250 "Result %p will be implicitly returned; Prev=%p\n",
252 WalkState
->ImplicitReturnObj
));
255 * Delete any "stale" implicit return value first. However, in
256 * complex statements, the implicit return value can be
257 * bubbled up several levels, so we don't clear the value if it
258 * is the same as the ReturnDesc.
260 if (WalkState
->ImplicitReturnObj
)
262 if (WalkState
->ImplicitReturnObj
== ReturnDesc
)
266 AcpiDsClearImplicitReturn (WalkState
);
269 /* Save the implicit return value, add a reference if requested */
271 WalkState
->ImplicitReturnObj
= ReturnDesc
;
274 AcpiUtAddReference (ReturnDesc
);
281 /*******************************************************************************
283 * FUNCTION: AcpiDsIsResultUsed
285 * PARAMETERS: Op - Current Op
286 * WalkState - Current State
288 * RETURN: TRUE if result is used, FALSE otherwise
290 * DESCRIPTION: Check if a result object will be used by the parent
292 ******************************************************************************/
296 ACPI_PARSE_OBJECT
*Op
,
297 ACPI_WALK_STATE
*WalkState
)
299 const ACPI_OPCODE_INFO
*ParentInfo
;
301 ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed
, Op
);
304 /* Must have both an Op and a Result Object */
308 ACPI_ERROR ((AE_INFO
, "Null Op"));
313 * We know that this operator is not a
314 * Return() operator (would not come here.) The following code is the
315 * optional support for a so-called "implicit return". Some AML code
316 * assumes that the last value of the method is "implicitly" returned
317 * to the caller. Just save the last result as the return value.
318 * NOTE: this is optional because the ASL language does not actually
319 * support this behavior.
321 (void) AcpiDsDoImplicitReturn (WalkState
->ResultObj
, WalkState
, TRUE
);
324 * Now determine if the parent will use the result
326 * If there is no parent, or the parent is a ScopeOp, we are executing
327 * at the method level. An executing method typically has no parent,
328 * since each method is parsed separately. A method invoked externally
329 * via ExecuteControlMethod has a ScopeOp as the parent.
331 if ((!Op
->Common
.Parent
) ||
332 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_SCOPE_OP
))
334 /* No parent, the return value cannot possibly be used */
336 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
337 "At Method level, result of [%s] not used\n",
338 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
)));
339 return_UINT8 (FALSE
);
342 /* Get info on the parent. The RootOp is AML_SCOPE */
344 ParentInfo
= AcpiPsGetOpcodeInfo (Op
->Common
.Parent
->Common
.AmlOpcode
);
345 if (ParentInfo
->Class
== AML_CLASS_UNKNOWN
)
347 ACPI_ERROR ((AE_INFO
,
348 "Unknown parent opcode Op=%p", Op
));
349 return_UINT8 (FALSE
);
353 * Decide what to do with the result based on the parent. If
354 * the parent opcode will not use the result, delete the object.
355 * Otherwise leave it as is, it will be deleted when it is used
356 * as an operand later.
358 switch (ParentInfo
->Class
)
360 case AML_CLASS_CONTROL
:
362 switch (Op
->Common
.Parent
->Common
.AmlOpcode
)
366 /* Never delete the return value associated with a return opcode */
373 * If we are executing the predicate AND this is the predicate op,
374 * we will use the return value
376 if ((WalkState
->ControlState
->Common
.State
==
377 ACPI_CONTROL_PREDICATE_EXECUTING
) &&
378 (WalkState
->ControlState
->Control
.PredicateOp
== Op
))
386 /* Ignore other control opcodes */
391 /* The general control opcode returns no result */
395 case AML_CLASS_CREATE
:
397 * These opcodes allow TermArg(s) as operands and therefore
398 * the operands can be method calls. The result is used.
402 case AML_CLASS_NAMED_OBJECT
:
404 if ((Op
->Common
.Parent
->Common
.AmlOpcode
== AML_REGION_OP
) ||
405 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_DATA_REGION_OP
) ||
406 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_PACKAGE_OP
) ||
407 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_BUFFER_OP
) ||
408 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_VARIABLE_PACKAGE_OP
) ||
409 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_INT_EVAL_SUBTREE_OP
) ||
410 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_BANK_FIELD_OP
))
413 * These opcodes allow TermArg(s) as operands and therefore
414 * the operands can be method calls. The result is used.
423 * In all other cases. the parent will actually use the return
424 * object, so keep it.
431 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
432 "Result of [%s] used by Parent [%s] Op=%p\n",
433 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
434 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
440 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
441 "Result of [%s] not used by Parent [%s] Op=%p\n",
442 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
443 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
445 return_UINT8 (FALSE
);
449 /*******************************************************************************
451 * FUNCTION: AcpiDsDeleteResultIfNotUsed
453 * PARAMETERS: Op - Current parse Op
454 * ResultObj - Result of the operation
455 * WalkState - Current state
459 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
460 * result descriptor, check if the parent opcode will actually use
461 * this result. If not, delete the result now so that it will
462 * not become orphaned.
464 ******************************************************************************/
467 AcpiDsDeleteResultIfNotUsed (
468 ACPI_PARSE_OBJECT
*Op
,
469 ACPI_OPERAND_OBJECT
*ResultObj
,
470 ACPI_WALK_STATE
*WalkState
)
472 ACPI_OPERAND_OBJECT
*ObjDesc
;
476 ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed
, ResultObj
);
481 ACPI_ERROR ((AE_INFO
, "Null Op"));
490 if (!AcpiDsIsResultUsed (Op
, WalkState
))
492 /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
494 Status
= AcpiDsResultPop (&ObjDesc
, WalkState
);
495 if (ACPI_SUCCESS (Status
))
497 AcpiUtRemoveReference (ResultObj
);
505 /*******************************************************************************
507 * FUNCTION: AcpiDsResolveOperands
509 * PARAMETERS: WalkState - Current walk state with operands on stack
513 * DESCRIPTION: Resolve all operands to their values. Used to prepare
514 * arguments to a control method invocation (a call from one
515 * method to another.)
517 ******************************************************************************/
520 AcpiDsResolveOperands (
521 ACPI_WALK_STATE
*WalkState
)
524 ACPI_STATUS Status
= AE_OK
;
527 ACPI_FUNCTION_TRACE_PTR (DsResolveOperands
, WalkState
);
531 * Attempt to resolve each of the valid operands
532 * Method arguments are passed by reference, not by value. This means
533 * that the actual objects are passed, not copies of the objects.
535 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
537 Status
= AcpiExResolveToValue (&WalkState
->Operands
[i
], WalkState
);
538 if (ACPI_FAILURE (Status
))
544 return_ACPI_STATUS (Status
);
548 /*******************************************************************************
550 * FUNCTION: AcpiDsClearOperands
552 * PARAMETERS: WalkState - Current walk state with operands on stack
556 * DESCRIPTION: Clear all operands on the current walk state operand stack.
558 ******************************************************************************/
561 AcpiDsClearOperands (
562 ACPI_WALK_STATE
*WalkState
)
567 ACPI_FUNCTION_TRACE_PTR (DsClearOperands
, WalkState
);
570 /* Remove a reference on each operand on the stack */
572 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
575 * Remove a reference to all operands, including both
576 * "Arguments" and "Targets".
578 AcpiUtRemoveReference (WalkState
->Operands
[i
]);
579 WalkState
->Operands
[i
] = NULL
;
582 WalkState
->NumOperands
= 0;
587 /*******************************************************************************
589 * FUNCTION: AcpiDsCreateOperand
591 * PARAMETERS: WalkState - Current walk state
592 * Arg - Parse object for the argument
593 * ArgIndex - Which argument (zero based)
597 * DESCRIPTION: Translate a parse tree object that is an argument to an AML
598 * opcode to the equivalent interpreter object. This may include
599 * looking up a name or entering a new name into the internal
602 ******************************************************************************/
605 AcpiDsCreateOperand (
606 ACPI_WALK_STATE
*WalkState
,
607 ACPI_PARSE_OBJECT
*Arg
,
610 ACPI_STATUS Status
= AE_OK
;
613 ACPI_OPERAND_OBJECT
*ObjDesc
;
614 ACPI_PARSE_OBJECT
*ParentOp
;
616 ACPI_INTERPRETER_MODE InterpreterMode
;
617 const ACPI_OPCODE_INFO
*OpInfo
;
620 ACPI_FUNCTION_TRACE_PTR (DsCreateOperand
, Arg
);
623 /* A valid name must be looked up in the namespace */
625 if ((Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
) &&
626 (Arg
->Common
.Value
.String
) &&
627 !(Arg
->Common
.Flags
& ACPI_PARSEOP_IN_STACK
))
629 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Getting a name: Arg=%p\n", Arg
));
631 /* Get the entire name string from the AML stream */
633 Status
= AcpiExGetNameString (ACPI_TYPE_ANY
,
634 Arg
->Common
.Value
.Buffer
, &NameString
, &NameLength
);
636 if (ACPI_FAILURE (Status
))
638 return_ACPI_STATUS (Status
);
641 /* All prefixes have been handled, and the name is in NameString */
644 * Special handling for BufferField declarations. This is a deferred
645 * opcode that unfortunately defines the field name as the last
646 * parameter instead of the first. We get here when we are performing
647 * the deferred execution, so the actual name of the field is already
648 * in the namespace. We don't want to attempt to look it up again
649 * because we may be executing in a different scope than where the
650 * actual opcode exists.
652 if ((WalkState
->DeferredNode
) &&
653 (WalkState
->DeferredNode
->Type
== ACPI_TYPE_BUFFER_FIELD
) &&
654 (ArgIndex
== (UINT32
)
655 ((WalkState
->Opcode
== AML_CREATE_FIELD_OP
) ? 3 : 2)))
657 ObjDesc
= ACPI_CAST_PTR (
658 ACPI_OPERAND_OBJECT
, WalkState
->DeferredNode
);
661 else /* All other opcodes */
664 * Differentiate between a namespace "create" operation
665 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
666 * IMODE_EXECUTE) in order to support the creation of
667 * namespace objects during the execution of control methods.
669 ParentOp
= Arg
->Common
.Parent
;
670 OpInfo
= AcpiPsGetOpcodeInfo (ParentOp
->Common
.AmlOpcode
);
672 if ((OpInfo
->Flags
& AML_NSNODE
) &&
673 (ParentOp
->Common
.AmlOpcode
!= AML_INT_METHODCALL_OP
) &&
674 (ParentOp
->Common
.AmlOpcode
!= AML_REGION_OP
) &&
675 (ParentOp
->Common
.AmlOpcode
!= AML_INT_NAMEPATH_OP
))
677 /* Enter name into namespace if not found */
679 InterpreterMode
= ACPI_IMODE_LOAD_PASS2
;
683 /* Return a failure if name not found */
685 InterpreterMode
= ACPI_IMODE_EXECUTE
;
688 Status
= AcpiNsLookup (WalkState
->ScopeInfo
, NameString
,
689 ACPI_TYPE_ANY
, InterpreterMode
,
690 ACPI_NS_SEARCH_PARENT
| ACPI_NS_DONT_OPEN_SCOPE
, WalkState
,
691 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE
, &ObjDesc
));
693 * The only case where we pass through (ignore) a NOT_FOUND
694 * error is for the CondRefOf opcode.
696 if (Status
== AE_NOT_FOUND
)
698 if (ParentOp
->Common
.AmlOpcode
== AML_CONDITIONAL_REF_OF_OP
)
701 * For the Conditional Reference op, it's OK if
702 * the name is not found; We just need a way to
703 * indicate this to the interpreter, set the
706 ObjDesc
= ACPI_CAST_PTR (
707 ACPI_OPERAND_OBJECT
, AcpiGbl_RootNode
);
710 else if (ParentOp
->Common
.AmlOpcode
== AML_EXTERNAL_OP
)
713 * This opcode should never appear here. It is used only
714 * by AML disassemblers and is surrounded by an If(0)
715 * by the ASL compiler.
717 * Therefore, if we see it here, it is a serious error.
719 Status
= AE_AML_BAD_OPCODE
;
724 * We just plain didn't find it -- which is a
725 * very serious error at this point
727 Status
= AE_AML_NAME_NOT_FOUND
;
731 if (ACPI_FAILURE (Status
))
733 ACPI_ERROR_NAMESPACE (WalkState
->ScopeInfo
,
738 /* Free the namestring created above */
740 ACPI_FREE (NameString
);
742 /* Check status from the lookup */
744 if (ACPI_FAILURE (Status
))
746 return_ACPI_STATUS (Status
);
749 /* Put the resulting object onto the current object stack */
751 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
752 if (ACPI_FAILURE (Status
))
754 return_ACPI_STATUS (Status
);
757 AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
);
761 /* Check for null name case */
763 if ((Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
) &&
764 !(Arg
->Common
.Flags
& ACPI_PARSEOP_IN_STACK
))
767 * If the name is null, this means that this is an
768 * optional result parameter that was not specified
769 * in the original ASL. Create a Zero Constant for a
770 * placeholder. (Store to a constant is a Noop.)
772 Opcode
= AML_ZERO_OP
; /* Has no arguments! */
774 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
775 "Null namepath: Arg=%p\n", Arg
));
779 Opcode
= Arg
->Common
.AmlOpcode
;
782 /* Get the object type of the argument */
784 OpInfo
= AcpiPsGetOpcodeInfo (Opcode
);
785 if (OpInfo
->ObjectType
== ACPI_TYPE_INVALID
)
787 return_ACPI_STATUS (AE_NOT_IMPLEMENTED
);
790 if ((OpInfo
->Flags
& AML_HAS_RETVAL
) ||
791 (Arg
->Common
.Flags
& ACPI_PARSEOP_IN_STACK
))
794 * Use value that was already previously returned
795 * by the evaluation of this argument
797 Status
= AcpiDsResultPop (&ObjDesc
, WalkState
);
798 if (ACPI_FAILURE (Status
))
801 * Only error is underflow, and this indicates
802 * a missing or null operand!
804 ACPI_EXCEPTION ((AE_INFO
, Status
,
805 "Missing or null operand"));
806 return_ACPI_STATUS (Status
);
811 /* Create an ACPI_INTERNAL_OBJECT for the argument */
813 ObjDesc
= AcpiUtCreateInternalObject (OpInfo
->ObjectType
);
816 return_ACPI_STATUS (AE_NO_MEMORY
);
819 /* Initialize the new object */
821 Status
= AcpiDsInitObjectFromOp (
822 WalkState
, Arg
, Opcode
, &ObjDesc
);
823 if (ACPI_FAILURE (Status
))
825 AcpiUtDeleteObjectDesc (ObjDesc
);
826 return_ACPI_STATUS (Status
);
830 /* Put the operand object on the object stack */
832 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
833 if (ACPI_FAILURE (Status
))
835 return_ACPI_STATUS (Status
);
838 AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
);
841 return_ACPI_STATUS (AE_OK
);
845 /*******************************************************************************
847 * FUNCTION: AcpiDsCreateOperands
849 * PARAMETERS: WalkState - Current state
850 * FirstArg - First argument of a parser argument tree
854 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
855 * namespace objects and place those argument object on the object
856 * stack in preparation for evaluation by the interpreter.
858 ******************************************************************************/
861 AcpiDsCreateOperands (
862 ACPI_WALK_STATE
*WalkState
,
863 ACPI_PARSE_OBJECT
*FirstArg
)
865 ACPI_STATUS Status
= AE_OK
;
866 ACPI_PARSE_OBJECT
*Arg
;
867 ACPI_PARSE_OBJECT
*Arguments
[ACPI_OBJ_NUM_OPERANDS
];
869 UINT32 Index
= WalkState
->NumOperands
;
873 ACPI_FUNCTION_TRACE_PTR (DsCreateOperands
, FirstArg
);
876 /* Get all arguments in the list */
881 if (Index
>= ACPI_OBJ_NUM_OPERANDS
)
883 return_ACPI_STATUS (AE_BAD_DATA
);
886 Arguments
[Index
] = Arg
;
887 WalkState
->Operands
[Index
] = NULL
;
889 /* Move on to next argument, if any */
891 Arg
= Arg
->Common
.Next
;
896 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
897 "NumOperands %d, ArgCount %d, Index %d\n",
898 WalkState
->NumOperands
, ArgCount
, Index
));
900 /* Create the interpreter arguments, in reverse order */
903 for (i
= 0; i
< ArgCount
; i
++)
905 Arg
= Arguments
[Index
];
906 WalkState
->OperandIndex
= (UINT8
) Index
;
908 Status
= AcpiDsCreateOperand (WalkState
, Arg
, Index
);
909 if (ACPI_FAILURE (Status
))
914 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
915 "Created Arg #%u (%p) %u args total\n",
916 Index
, Arg
, ArgCount
));
920 return_ACPI_STATUS (Status
);
925 * We must undo everything done above; meaning that we must
926 * pop everything off of the operand stack and delete those
929 AcpiDsObjStackPopAndDelete (ArgCount
, WalkState
);
931 ACPI_EXCEPTION ((AE_INFO
, Status
, "While creating Arg %u", Index
));
932 return_ACPI_STATUS (Status
);
936 /*****************************************************************************
938 * FUNCTION: AcpiDsEvaluateNamePath
940 * PARAMETERS: WalkState - Current state of the parse tree walk,
941 * the opcode of current operation should be
942 * AML_INT_NAMEPATH_OP
946 * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent
947 * interpreter object, convert it to value, if needed, duplicate
948 * it, if needed, and push it onto the current result stack.
950 ****************************************************************************/
953 AcpiDsEvaluateNamePath (
954 ACPI_WALK_STATE
*WalkState
)
956 ACPI_STATUS Status
= AE_OK
;
957 ACPI_PARSE_OBJECT
*Op
= WalkState
->Op
;
958 ACPI_OPERAND_OBJECT
**Operand
= &WalkState
->Operands
[0];
959 ACPI_OPERAND_OBJECT
*NewObjDesc
;
963 ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath
, WalkState
);
966 if (!Op
->Common
.Parent
)
968 /* This happens after certain exception processing */
973 if ((Op
->Common
.Parent
->Common
.AmlOpcode
== AML_PACKAGE_OP
) ||
974 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_VARIABLE_PACKAGE_OP
) ||
975 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_REF_OF_OP
))
977 /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */
982 Status
= AcpiDsCreateOperand (WalkState
, Op
, 0);
983 if (ACPI_FAILURE (Status
))
988 if (Op
->Common
.Flags
& ACPI_PARSEOP_TARGET
)
990 NewObjDesc
= *Operand
;
994 Type
= (*Operand
)->Common
.Type
;
996 Status
= AcpiExResolveToValue (Operand
, WalkState
);
997 if (ACPI_FAILURE (Status
))
1002 if (Type
== ACPI_TYPE_INTEGER
)
1004 /* It was incremented by AcpiExResolveToValue */
1006 AcpiUtRemoveReference (*Operand
);
1008 Status
= AcpiUtCopyIobjectToIobject (
1009 *Operand
, &NewObjDesc
, WalkState
);
1010 if (ACPI_FAILURE (Status
))
1018 * The object either was anew created or is
1019 * a Namespace node - don't decrement it.
1021 NewObjDesc
= *Operand
;
1024 /* Cleanup for name-path operand */
1026 Status
= AcpiDsObjStackPop (1, WalkState
);
1027 if (ACPI_FAILURE (Status
))
1029 WalkState
->ResultObj
= NewObjDesc
;
1035 WalkState
->ResultObj
= NewObjDesc
;
1037 Status
= AcpiDsResultPush (WalkState
->ResultObj
, WalkState
);
1038 if (ACPI_SUCCESS (Status
))
1040 /* Force to take it from stack */
1042 Op
->Common
.Flags
|= ACPI_PARSEOP_IN_STACK
;
1047 return_ACPI_STATUS (Status
);