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 #ifndef ACPI_NO_METHOD_EXECUTION
213 /*******************************************************************************
215 * FUNCTION: AcpiDsDoImplicitReturn
217 * PARAMETERS: ReturnDesc - The return value
218 * WalkState - Current State
219 * AddReference - True if a reference should be added to the
222 * RETURN: TRUE if implicit return enabled, FALSE otherwise
224 * DESCRIPTION: Implements the optional "implicit return". We save the result
225 * of every ASL operator and control method invocation in case the
226 * parent method exit. Before storing a new return value, we
227 * delete the previous return value.
229 ******************************************************************************/
232 AcpiDsDoImplicitReturn (
233 ACPI_OPERAND_OBJECT
*ReturnDesc
,
234 ACPI_WALK_STATE
*WalkState
,
235 BOOLEAN AddReference
)
237 ACPI_FUNCTION_NAME (DsDoImplicitReturn
);
241 * Slack must be enabled for this feature, and we must
242 * have a valid return object
244 if ((!AcpiGbl_EnableInterpreterSlack
) ||
250 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
251 "Result %p will be implicitly returned; Prev=%p\n",
253 WalkState
->ImplicitReturnObj
));
256 * Delete any "stale" implicit return value first. However, in
257 * complex statements, the implicit return value can be
258 * bubbled up several levels, so we don't clear the value if it
259 * is the same as the ReturnDesc.
261 if (WalkState
->ImplicitReturnObj
)
263 if (WalkState
->ImplicitReturnObj
== ReturnDesc
)
267 AcpiDsClearImplicitReturn (WalkState
);
270 /* Save the implicit return value, add a reference if requested */
272 WalkState
->ImplicitReturnObj
= ReturnDesc
;
275 AcpiUtAddReference (ReturnDesc
);
282 /*******************************************************************************
284 * FUNCTION: AcpiDsIsResultUsed
286 * PARAMETERS: Op - Current Op
287 * WalkState - Current State
289 * RETURN: TRUE if result is used, FALSE otherwise
291 * DESCRIPTION: Check if a result object will be used by the parent
293 ******************************************************************************/
297 ACPI_PARSE_OBJECT
*Op
,
298 ACPI_WALK_STATE
*WalkState
)
300 const ACPI_OPCODE_INFO
*ParentInfo
;
302 ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed
, Op
);
305 /* Must have both an Op and a Result Object */
309 ACPI_ERROR ((AE_INFO
, "Null Op"));
314 * We know that this operator is not a
315 * Return() operator (would not come here.) The following code is the
316 * optional support for a so-called "implicit return". Some AML code
317 * assumes that the last value of the method is "implicitly" returned
318 * to the caller. Just save the last result as the return value.
319 * NOTE: this is optional because the ASL language does not actually
320 * support this behavior.
322 (void) AcpiDsDoImplicitReturn (WalkState
->ResultObj
, WalkState
, TRUE
);
325 * Now determine if the parent will use the result
327 * If there is no parent, or the parent is a ScopeOp, we are executing
328 * at the method level. An executing method typically has no parent,
329 * since each method is parsed separately. A method invoked externally
330 * via ExecuteControlMethod has a ScopeOp as the parent.
332 if ((!Op
->Common
.Parent
) ||
333 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_SCOPE_OP
))
335 /* No parent, the return value cannot possibly be used */
337 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
338 "At Method level, result of [%s] not used\n",
339 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
)));
340 return_UINT8 (FALSE
);
343 /* Get info on the parent. The RootOp is AML_SCOPE */
345 ParentInfo
= AcpiPsGetOpcodeInfo (Op
->Common
.Parent
->Common
.AmlOpcode
);
346 if (ParentInfo
->Class
== AML_CLASS_UNKNOWN
)
348 ACPI_ERROR ((AE_INFO
,
349 "Unknown parent opcode Op=%p", Op
));
350 return_UINT8 (FALSE
);
354 * Decide what to do with the result based on the parent. If
355 * the parent opcode will not use the result, delete the object.
356 * Otherwise leave it as is, it will be deleted when it is used
357 * as an operand later.
359 switch (ParentInfo
->Class
)
361 case AML_CLASS_CONTROL
:
363 switch (Op
->Common
.Parent
->Common
.AmlOpcode
)
367 /* Never delete the return value associated with a return opcode */
374 * If we are executing the predicate AND this is the predicate op,
375 * we will use the return value
377 if ((WalkState
->ControlState
->Common
.State
==
378 ACPI_CONTROL_PREDICATE_EXECUTING
) &&
379 (WalkState
->ControlState
->Control
.PredicateOp
== Op
))
387 /* Ignore other control opcodes */
392 /* The general control opcode returns no result */
396 case AML_CLASS_CREATE
:
398 * These opcodes allow TermArg(s) as operands and therefore
399 * the operands can be method calls. The result is used.
403 case AML_CLASS_NAMED_OBJECT
:
405 if ((Op
->Common
.Parent
->Common
.AmlOpcode
== AML_REGION_OP
) ||
406 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_DATA_REGION_OP
) ||
407 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_PACKAGE_OP
) ||
408 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_BUFFER_OP
) ||
409 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_VARIABLE_PACKAGE_OP
) ||
410 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_INT_EVAL_SUBTREE_OP
) ||
411 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_BANK_FIELD_OP
))
414 * These opcodes allow TermArg(s) as operands and therefore
415 * the operands can be method calls. The result is used.
424 * In all other cases. the parent will actually use the return
425 * object, so keep it.
432 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
433 "Result of [%s] used by Parent [%s] Op=%p\n",
434 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
435 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
441 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
442 "Result of [%s] not used by Parent [%s] Op=%p\n",
443 AcpiPsGetOpcodeName (Op
->Common
.AmlOpcode
),
444 AcpiPsGetOpcodeName (Op
->Common
.Parent
->Common
.AmlOpcode
), Op
));
446 return_UINT8 (FALSE
);
450 /*******************************************************************************
452 * FUNCTION: AcpiDsDeleteResultIfNotUsed
454 * PARAMETERS: Op - Current parse Op
455 * ResultObj - Result of the operation
456 * WalkState - Current state
460 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
461 * result descriptor, check if the parent opcode will actually use
462 * this result. If not, delete the result now so that it will
463 * not become orphaned.
465 ******************************************************************************/
468 AcpiDsDeleteResultIfNotUsed (
469 ACPI_PARSE_OBJECT
*Op
,
470 ACPI_OPERAND_OBJECT
*ResultObj
,
471 ACPI_WALK_STATE
*WalkState
)
473 ACPI_OPERAND_OBJECT
*ObjDesc
;
477 ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed
, ResultObj
);
482 ACPI_ERROR ((AE_INFO
, "Null Op"));
491 if (!AcpiDsIsResultUsed (Op
, WalkState
))
493 /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
495 Status
= AcpiDsResultPop (&ObjDesc
, WalkState
);
496 if (ACPI_SUCCESS (Status
))
498 AcpiUtRemoveReference (ResultObj
);
506 /*******************************************************************************
508 * FUNCTION: AcpiDsResolveOperands
510 * PARAMETERS: WalkState - Current walk state with operands on stack
514 * DESCRIPTION: Resolve all operands to their values. Used to prepare
515 * arguments to a control method invocation (a call from one
516 * method to another.)
518 ******************************************************************************/
521 AcpiDsResolveOperands (
522 ACPI_WALK_STATE
*WalkState
)
525 ACPI_STATUS Status
= AE_OK
;
528 ACPI_FUNCTION_TRACE_PTR (DsResolveOperands
, WalkState
);
532 * Attempt to resolve each of the valid operands
533 * Method arguments are passed by reference, not by value. This means
534 * that the actual objects are passed, not copies of the objects.
536 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
538 Status
= AcpiExResolveToValue (&WalkState
->Operands
[i
], WalkState
);
539 if (ACPI_FAILURE (Status
))
545 return_ACPI_STATUS (Status
);
549 /*******************************************************************************
551 * FUNCTION: AcpiDsClearOperands
553 * PARAMETERS: WalkState - Current walk state with operands on stack
557 * DESCRIPTION: Clear all operands on the current walk state operand stack.
559 ******************************************************************************/
562 AcpiDsClearOperands (
563 ACPI_WALK_STATE
*WalkState
)
568 ACPI_FUNCTION_TRACE_PTR (DsClearOperands
, WalkState
);
571 /* Remove a reference on each operand on the stack */
573 for (i
= 0; i
< WalkState
->NumOperands
; i
++)
576 * Remove a reference to all operands, including both
577 * "Arguments" and "Targets".
579 AcpiUtRemoveReference (WalkState
->Operands
[i
]);
580 WalkState
->Operands
[i
] = NULL
;
583 WalkState
->NumOperands
= 0;
589 /*******************************************************************************
591 * FUNCTION: AcpiDsCreateOperand
593 * PARAMETERS: WalkState - Current walk state
594 * Arg - Parse object for the argument
595 * ArgIndex - Which argument (zero based)
599 * DESCRIPTION: Translate a parse tree object that is an argument to an AML
600 * opcode to the equivalent interpreter object. This may include
601 * looking up a name or entering a new name into the internal
604 ******************************************************************************/
607 AcpiDsCreateOperand (
608 ACPI_WALK_STATE
*WalkState
,
609 ACPI_PARSE_OBJECT
*Arg
,
612 ACPI_STATUS Status
= AE_OK
;
615 ACPI_OPERAND_OBJECT
*ObjDesc
;
616 ACPI_PARSE_OBJECT
*ParentOp
;
618 ACPI_INTERPRETER_MODE InterpreterMode
;
619 const ACPI_OPCODE_INFO
*OpInfo
;
622 ACPI_FUNCTION_TRACE_PTR (DsCreateOperand
, Arg
);
625 /* A valid name must be looked up in the namespace */
627 if ((Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
) &&
628 (Arg
->Common
.Value
.String
) &&
629 !(Arg
->Common
.Flags
& ACPI_PARSEOP_IN_STACK
))
631 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
, "Getting a name: Arg=%p\n", Arg
));
633 /* Get the entire name string from the AML stream */
635 Status
= AcpiExGetNameString (ACPI_TYPE_ANY
,
636 Arg
->Common
.Value
.Buffer
, &NameString
, &NameLength
);
638 if (ACPI_FAILURE (Status
))
640 return_ACPI_STATUS (Status
);
643 /* All prefixes have been handled, and the name is in NameString */
646 * Special handling for BufferField declarations. This is a deferred
647 * opcode that unfortunately defines the field name as the last
648 * parameter instead of the first. We get here when we are performing
649 * the deferred execution, so the actual name of the field is already
650 * in the namespace. We don't want to attempt to look it up again
651 * because we may be executing in a different scope than where the
652 * actual opcode exists.
654 if ((WalkState
->DeferredNode
) &&
655 (WalkState
->DeferredNode
->Type
== ACPI_TYPE_BUFFER_FIELD
) &&
656 (ArgIndex
== (UINT32
)
657 ((WalkState
->Opcode
== AML_CREATE_FIELD_OP
) ? 3 : 2)))
659 ObjDesc
= ACPI_CAST_PTR (
660 ACPI_OPERAND_OBJECT
, WalkState
->DeferredNode
);
663 else /* All other opcodes */
666 * Differentiate between a namespace "create" operation
667 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
668 * IMODE_EXECUTE) in order to support the creation of
669 * namespace objects during the execution of control methods.
671 ParentOp
= Arg
->Common
.Parent
;
672 OpInfo
= AcpiPsGetOpcodeInfo (ParentOp
->Common
.AmlOpcode
);
674 if ((OpInfo
->Flags
& AML_NSNODE
) &&
675 (ParentOp
->Common
.AmlOpcode
!= AML_INT_METHODCALL_OP
) &&
676 (ParentOp
->Common
.AmlOpcode
!= AML_REGION_OP
) &&
677 (ParentOp
->Common
.AmlOpcode
!= AML_INT_NAMEPATH_OP
))
679 /* Enter name into namespace if not found */
681 InterpreterMode
= ACPI_IMODE_LOAD_PASS2
;
685 /* Return a failure if name not found */
687 InterpreterMode
= ACPI_IMODE_EXECUTE
;
690 Status
= AcpiNsLookup (WalkState
->ScopeInfo
, NameString
,
691 ACPI_TYPE_ANY
, InterpreterMode
,
692 ACPI_NS_SEARCH_PARENT
| ACPI_NS_DONT_OPEN_SCOPE
, WalkState
,
693 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE
, &ObjDesc
));
695 * The only case where we pass through (ignore) a NOT_FOUND
696 * error is for the CondRefOf opcode.
698 if (Status
== AE_NOT_FOUND
)
700 if (ParentOp
->Common
.AmlOpcode
== AML_CONDITIONAL_REF_OF_OP
)
703 * For the Conditional Reference op, it's OK if
704 * the name is not found; We just need a way to
705 * indicate this to the interpreter, set the
708 ObjDesc
= ACPI_CAST_PTR (
709 ACPI_OPERAND_OBJECT
, AcpiGbl_RootNode
);
712 else if (ParentOp
->Common
.AmlOpcode
== AML_EXTERNAL_OP
)
715 * This opcode should never appear here. It is used only
716 * by AML disassemblers and is surrounded by an If(0)
717 * by the ASL compiler.
719 * Therefore, if we see it here, it is a serious error.
721 Status
= AE_AML_BAD_OPCODE
;
726 * We just plain didn't find it -- which is a
727 * very serious error at this point
729 Status
= AE_AML_NAME_NOT_FOUND
;
733 if (ACPI_FAILURE (Status
))
735 ACPI_ERROR_NAMESPACE (WalkState
->ScopeInfo
,
740 /* Free the namestring created above */
742 ACPI_FREE (NameString
);
744 /* Check status from the lookup */
746 if (ACPI_FAILURE (Status
))
748 return_ACPI_STATUS (Status
);
751 /* Put the resulting object onto the current object stack */
753 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
754 if (ACPI_FAILURE (Status
))
756 return_ACPI_STATUS (Status
);
759 AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
);
763 /* Check for null name case */
765 if ((Arg
->Common
.AmlOpcode
== AML_INT_NAMEPATH_OP
) &&
766 !(Arg
->Common
.Flags
& ACPI_PARSEOP_IN_STACK
))
769 * If the name is null, this means that this is an
770 * optional result parameter that was not specified
771 * in the original ASL. Create a Zero Constant for a
772 * placeholder. (Store to a constant is a Noop.)
774 Opcode
= AML_ZERO_OP
; /* Has no arguments! */
776 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
777 "Null namepath: Arg=%p\n", Arg
));
781 Opcode
= Arg
->Common
.AmlOpcode
;
784 /* Get the object type of the argument */
786 OpInfo
= AcpiPsGetOpcodeInfo (Opcode
);
787 if (OpInfo
->ObjectType
== ACPI_TYPE_INVALID
)
789 return_ACPI_STATUS (AE_NOT_IMPLEMENTED
);
792 if ((OpInfo
->Flags
& AML_HAS_RETVAL
) ||
793 (Arg
->Common
.Flags
& ACPI_PARSEOP_IN_STACK
))
796 * Use value that was already previously returned
797 * by the evaluation of this argument
799 Status
= AcpiDsResultPop (&ObjDesc
, WalkState
);
800 if (ACPI_FAILURE (Status
))
803 * Only error is underflow, and this indicates
804 * a missing or null operand!
806 ACPI_EXCEPTION ((AE_INFO
, Status
,
807 "Missing or null operand"));
808 return_ACPI_STATUS (Status
);
813 /* Create an ACPI_INTERNAL_OBJECT for the argument */
815 ObjDesc
= AcpiUtCreateInternalObject (OpInfo
->ObjectType
);
818 return_ACPI_STATUS (AE_NO_MEMORY
);
821 /* Initialize the new object */
823 Status
= AcpiDsInitObjectFromOp (
824 WalkState
, Arg
, Opcode
, &ObjDesc
);
825 if (ACPI_FAILURE (Status
))
827 AcpiUtDeleteObjectDesc (ObjDesc
);
828 return_ACPI_STATUS (Status
);
832 /* Put the operand object on the object stack */
834 Status
= AcpiDsObjStackPush (ObjDesc
, WalkState
);
835 if (ACPI_FAILURE (Status
))
837 return_ACPI_STATUS (Status
);
840 AcpiDbDisplayArgumentObject (ObjDesc
, WalkState
);
843 return_ACPI_STATUS (AE_OK
);
847 /*******************************************************************************
849 * FUNCTION: AcpiDsCreateOperands
851 * PARAMETERS: WalkState - Current state
852 * FirstArg - First argument of a parser argument tree
856 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
857 * namespace objects and place those argument object on the object
858 * stack in preparation for evaluation by the interpreter.
860 ******************************************************************************/
863 AcpiDsCreateOperands (
864 ACPI_WALK_STATE
*WalkState
,
865 ACPI_PARSE_OBJECT
*FirstArg
)
867 ACPI_STATUS Status
= AE_OK
;
868 ACPI_PARSE_OBJECT
*Arg
;
869 ACPI_PARSE_OBJECT
*Arguments
[ACPI_OBJ_NUM_OPERANDS
];
871 UINT32 Index
= WalkState
->NumOperands
;
875 ACPI_FUNCTION_TRACE_PTR (DsCreateOperands
, FirstArg
);
878 /* Get all arguments in the list */
883 if (Index
>= ACPI_OBJ_NUM_OPERANDS
)
885 return_ACPI_STATUS (AE_BAD_DATA
);
888 Arguments
[Index
] = Arg
;
889 WalkState
->Operands
[Index
] = NULL
;
891 /* Move on to next argument, if any */
893 Arg
= Arg
->Common
.Next
;
898 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
899 "NumOperands %d, ArgCount %d, Index %d\n",
900 WalkState
->NumOperands
, ArgCount
, Index
));
902 /* Create the interpreter arguments, in reverse order */
905 for (i
= 0; i
< ArgCount
; i
++)
907 Arg
= Arguments
[Index
];
908 WalkState
->OperandIndex
= (UINT8
) Index
;
910 Status
= AcpiDsCreateOperand (WalkState
, Arg
, Index
);
911 if (ACPI_FAILURE (Status
))
916 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH
,
917 "Created Arg #%u (%p) %u args total\n",
918 Index
, Arg
, ArgCount
));
922 return_ACPI_STATUS (Status
);
927 * We must undo everything done above; meaning that we must
928 * pop everything off of the operand stack and delete those
931 AcpiDsObjStackPopAndDelete (ArgCount
, WalkState
);
933 ACPI_EXCEPTION ((AE_INFO
, Status
, "While creating Arg %u", Index
));
934 return_ACPI_STATUS (Status
);
938 /*****************************************************************************
940 * FUNCTION: AcpiDsEvaluateNamePath
942 * PARAMETERS: WalkState - Current state of the parse tree walk,
943 * the opcode of current operation should be
944 * AML_INT_NAMEPATH_OP
948 * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent
949 * interpreter object, convert it to value, if needed, duplicate
950 * it, if needed, and push it onto the current result stack.
952 ****************************************************************************/
955 AcpiDsEvaluateNamePath (
956 ACPI_WALK_STATE
*WalkState
)
958 ACPI_STATUS Status
= AE_OK
;
959 ACPI_PARSE_OBJECT
*Op
= WalkState
->Op
;
960 ACPI_OPERAND_OBJECT
**Operand
= &WalkState
->Operands
[0];
961 ACPI_OPERAND_OBJECT
*NewObjDesc
;
965 ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath
, WalkState
);
968 if (!Op
->Common
.Parent
)
970 /* This happens after certain exception processing */
975 if ((Op
->Common
.Parent
->Common
.AmlOpcode
== AML_PACKAGE_OP
) ||
976 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_VARIABLE_PACKAGE_OP
) ||
977 (Op
->Common
.Parent
->Common
.AmlOpcode
== AML_REF_OF_OP
))
979 /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */
984 Status
= AcpiDsCreateOperand (WalkState
, Op
, 0);
985 if (ACPI_FAILURE (Status
))
990 if (Op
->Common
.Flags
& ACPI_PARSEOP_TARGET
)
992 NewObjDesc
= *Operand
;
996 Type
= (*Operand
)->Common
.Type
;
998 Status
= AcpiExResolveToValue (Operand
, WalkState
);
999 if (ACPI_FAILURE (Status
))
1004 if (Type
== ACPI_TYPE_INTEGER
)
1006 /* It was incremented by AcpiExResolveToValue */
1008 AcpiUtRemoveReference (*Operand
);
1010 Status
= AcpiUtCopyIobjectToIobject (
1011 *Operand
, &NewObjDesc
, WalkState
);
1012 if (ACPI_FAILURE (Status
))
1020 * The object either was anew created or is
1021 * a Namespace node - don't decrement it.
1023 NewObjDesc
= *Operand
;
1026 /* Cleanup for name-path operand */
1028 Status
= AcpiDsObjStackPop (1, WalkState
);
1029 if (ACPI_FAILURE (Status
))
1031 WalkState
->ResultObj
= NewObjDesc
;
1037 WalkState
->ResultObj
= NewObjDesc
;
1039 Status
= AcpiDsResultPush (WalkState
->ResultObj
, WalkState
);
1040 if (ACPI_SUCCESS (Status
))
1042 /* Force to take it from stack */
1044 Op
->Common
.Flags
|= ACPI_PARSEOP_IN_STACK
;
1049 return_ACPI_STATUS (Status
);