1 /******************************************************************************
3 * Module Name: aslmethod.c - Control method analysis walk
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2020, 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 *****************************************************************************/
152 #include "aslcompiler.h"
153 #include "aslcompiler.y.h"
154 #include "acnamesp.h"
155 #include "acparser.h"
159 #define _COMPONENT ACPI_COMPILER
160 ACPI_MODULE_NAME ("aslmethod")
163 /* Local prototypes */
166 MtCheckNamedObjectInMethod (
167 ACPI_PARSE_OBJECT *Op,
168 ASL_METHOD_INFO *MethodInfo);
171 MtCheckStaticOperationRegionInMethod (
172 ACPI_PARSE_OBJECT *Op);
175 /*******************************************************************************
177 * FUNCTION: MtMethodAnalysisWalkBegin
179 * PARAMETERS: ASL_WALK_CALLBACK
183 * DESCRIPTION: Descending callback for the analysis walk. Check methods for:
184 * 1) Initialized local variables
188 ******************************************************************************/
191 MtMethodAnalysisWalkBegin (
192 ACPI_PARSE_OBJECT *Op,
196 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
197 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
198 ACPI_PARSE_OBJECT *Next;
199 UINT32 RegisterNumber;
201 char LocalName[] = "Local0";
202 char ArgName[] = "Arg0";
203 ACPI_PARSE_OBJECT *ArgNode;
204 ACPI_PARSE_OBJECT *NextType;
205 UINT8 ActualArgs = 0;
210 /* Build cross-reference output file if requested */
212 if (AslGbl_CrossReferenceOutput)
214 OtXrefWalkPart1 (Op, Level, MethodInfo);
217 switch (Op->Asl.ParseOpcode)
221 AslGbl_TotalMethods++;
223 /* Create and init method info */
225 MethodInfo = UtLocalCalloc (sizeof (ASL_METHOD_INFO));
226 MethodInfo->Next = WalkInfo->MethodStack;
229 WalkInfo->MethodStack = MethodInfo;
232 * Special handling for _PSx methods. Dependency rules (same scope):
234 * 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3
235 * 2) _PS1/_PS2/_PS3: A _PS0 must exist
237 if (ACPI_COMPARE_NAMESEG (METHOD_NAME__PS0, Op->Asl.NameSeg))
239 /* For _PS0, one of _PS1/_PS2/_PS3 must exist */
241 if ((!ApFindNameInScope (METHOD_NAME__PS1, Op)) &&
242 (!ApFindNameInScope (METHOD_NAME__PS2, Op)) &&
243 (!ApFindNameInScope (METHOD_NAME__PS3, Op)))
245 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
246 "_PS0 requires one of _PS1/_PS2/_PS3 in same scope");
250 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS1, Op->Asl.NameSeg) ||
251 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS2, Op->Asl.NameSeg) ||
252 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS3, Op->Asl.NameSeg))
254 /* For _PS1/_PS2/_PS3, a _PS0 must exist */
256 if (!ApFindNameInScope (METHOD_NAME__PS0, Op))
258 sprintf (AslGbl_MsgBuffer,
259 "%4.4s requires _PS0 in same scope", Op->Asl.NameSeg);
261 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
266 /* Get the name node */
268 Next = Op->Asl.Child;
270 /* Get the NumArguments node */
272 Next = Next->Asl.Next;
273 MethodInfo->NumArguments = (UINT8)
274 (((UINT8) Next->Asl.Value.Integer) & 0x07);
276 /* Get the SerializeRule and SyncLevel nodes, ignored here */
278 Next = Next->Asl.Next;
279 MethodInfo->ShouldBeSerialized = (UINT8) Next->Asl.Value.Integer;
281 Next = Next->Asl.Next;
284 /* Get the ReturnType node */
286 Next = Next->Asl.Next;
288 NextType = Next->Asl.Child;
290 MethodInfo->ValidReturnTypes = MtProcessTypeOp (NextType);
292 /* Get the ParameterType node */
294 Next = Next->Asl.Next;
296 NextType = Next->Asl.Child;
300 * The optional parameter types list was omitted at the source
301 * level. Use the Argument count parameter instead.
303 ActualArgs = MethodInfo->NumArguments;
307 ActualArgs = MtProcessParameterTypeList (NextType,
308 MethodInfo->ValidArgTypes);
311 if ((MethodInfo->NumArguments) &&
312 (MethodInfo->NumArguments != ActualArgs))
314 sprintf (AslGbl_MsgBuffer,
315 "Length = %u", ActualArgs);
316 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_MISMATCH,
317 Op->Asl.Child->Asl.Next, AslGbl_MsgBuffer);
320 /* Allow numarguments == 0 for Function() */
322 if ((!MethodInfo->NumArguments) && (ActualArgs))
324 MethodInfo->NumArguments = ActualArgs;
325 ArgNode->Asl.Value.Integer |= ActualArgs;
329 * Actual arguments are initialized at method entry.
330 * All other ArgX "registers" can be used as locals, so we
331 * track their initialization.
333 for (i = 0; i < MethodInfo->NumArguments; i++)
335 MethodInfo->ArgInitialized[i] = TRUE;
339 case PARSEOP_METHODCALL:
341 /* Check for a recursive method call */
344 (Op->Asl.Node == MethodInfo->Op->Asl.Node))
346 if (MethodInfo->CreatesNamedObjects)
349 * This is an error, as it will fail at runtime on all ACPI
350 * implementations. Any named object declarations will be
351 * executed twice, causing failure the second time. Note,
352 * this is independent of whether the method is declared
353 * Serialized, because the same thread is attempting to
354 * reenter the method, and this will always succeed.
356 AslDualParseOpError (ASL_ERROR, ASL_MSG_ILLEGAL_RECURSION, Op,
357 Op->Asl.Value.String, ASL_MSG_FOUND_HERE, MethodInfo->Op,
358 MethodInfo->Op->Asl.ExternalName);
362 /* Method does not create objects, issue a remark */
364 AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName);
381 * Local was used outside a control method, or there was an error
382 * in the method declaration.
384 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
385 Op, Op->Asl.ExternalName);
389 RegisterNumber = (Op->Asl.AmlOpcode & 0x0007);
392 * If the local is being used as a target, mark the local
395 if (Op->Asl.CompileFlags & OP_IS_TARGET)
397 MethodInfo->LocalInitialized[RegisterNumber] = TRUE;
401 * Otherwise, this is a reference, check if the local
402 * has been previously initialized.
404 * The only operator that accepts an uninitialized value is ObjectType()
406 else if ((!MethodInfo->LocalInitialized[RegisterNumber]) &&
407 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
409 LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30);
410 AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName);
425 * Arg was used outside a control method, or there was an error
426 * in the method declaration.
428 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
429 Op, Op->Asl.ExternalName);
433 RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8;
434 ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30);
437 * If the Arg is being used as a target, mark the local
440 if (Op->Asl.CompileFlags & OP_IS_TARGET)
442 MethodInfo->ArgInitialized[RegisterNumber] = TRUE;
446 * Otherwise, this is a reference, check if the Arg
447 * has been previously initialized.
449 * The only operator that accepts an uninitialized value is ObjectType()
451 else if ((!MethodInfo->ArgInitialized[RegisterNumber]) &&
452 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
454 AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName);
457 /* Flag this arg if it is not a "real" argument to the method */
459 if (RegisterNumber >= MethodInfo->NumArguments)
461 AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName);
470 * Probably was an error in the method declaration,
471 * no additional error here
473 ACPI_WARNING ((AE_INFO, "%p, No parent method", Op));
478 * A child indicates a possible return value. A simple Return or
479 * Return() is marked with OP_IS_NULL_RETURN by the parser so
480 * that it is not counted as a "real" return-with-value, although
481 * the AML code that is actually emitted is Return(0). The AML
482 * definition of Return has a required parameter, so we are
483 * forced to convert a null return to Return(0).
485 if ((Op->Asl.Child) &&
486 (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) &&
487 (!(Op->Asl.Child->Asl.CompileFlags & OP_IS_NULL_RETURN)))
489 MethodInfo->NumReturnWithValue++;
493 MethodInfo->NumReturnNoValue++;
498 case PARSEOP_CONTINUE:
500 Next = Op->Asl.Parent;
503 if (Next->Asl.ParseOpcode == PARSEOP_WHILE)
507 Next = Next->Asl.Parent;
512 AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL);
518 /* We can range check if the argument is an integer */
520 if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) &&
521 (Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX))
523 AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL);
529 /* Check usage of _HID and _ADR objects */
531 HidExists = ApFindNameInDeviceTree (METHOD_NAME__HID, Op);
532 AdrExists = ApFindNameInDeviceTree (METHOD_NAME__ADR, Op);
534 if (!HidExists && !AdrExists)
536 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
537 "Device object requires a _HID or _ADR in same scope");
539 else if (HidExists && AdrExists)
542 * According to the ACPI spec, "A device object must contain
543 * either an _HID object or an _ADR object, but should not contain
546 AslError (ASL_WARNING, ASL_MSG_MULTIPLE_TYPES, Op,
547 "Device object requires either a _HID or _ADR, but not both");
553 case PARSEOP_OPERATIONREGION:
554 case PARSEOP_POWERRESOURCE:
555 case PARSEOP_PROCESSOR:
556 case PARSEOP_THERMALZONE:
559 * The first operand is a name to be created in the namespace.
560 * Check against the reserved list.
562 i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg);
563 if (i < ACPI_VALID_RESERVED_NAME_MAX)
565 AslError (ASL_ERROR, ASL_MSG_RESERVED_USE,
566 Op, Op->Asl.ExternalName);
569 MtCheckStaticOperationRegionInMethod (Op);
574 /* Typecheck any predefined names statically defined with Name() */
576 ApCheckForPredefinedObject (Op, Op->Asl.NameSeg);
578 /* Special typechecking for _HID */
580 if (ACPI_COMPARE_NAMESEG (METHOD_NAME__HID, Op->Asl.NameSeg))
582 Next = Op->Asl.Child->Asl.Next;
583 AnCheckId (Next, ASL_TYPE_HID);
586 /* Special typechecking for _CID */
588 else if (ACPI_COMPARE_NAMESEG (METHOD_NAME__CID, Op->Asl.NameSeg))
590 Next = Op->Asl.Child->Asl.Next;
592 if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) ||
593 (Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE))
595 Next = Next->Asl.Child;
598 AnCheckId (Next, ASL_TYPE_CID);
599 Next = Next->Asl.Next;
604 AnCheckId (Next, ASL_TYPE_CID);
615 /* Check for named object creation within a non-serialized method */
617 MtCheckNamedObjectInMethod (Op, MethodInfo);
622 /*******************************************************************************
624 * FUNCTION: MtProcessTypeOp
626 * PARAMETERS: Op - Op representing a btype
628 * RETURN: Btype represented by Op
630 * DESCRIPTION: Process a parse object that represents single parameter type or
631 * a return type in method, function, and external declarations.
633 ******************************************************************************/
637 ACPI_PARSE_OBJECT *TypeOp)
639 UINT32 Btype = ACPI_BTYPE_ANY;
644 Btype |= AnMapObjTypeToBtype (TypeOp);
645 TypeOp->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
646 TypeOp = TypeOp->Asl.Next;
653 /*******************************************************************************
655 * FUNCTION: MtProcessParameterTypeList
657 * PARAMETERS: Op - Op representing a btype
659 * RETURN: Btype represented by Op
661 * DESCRIPTION: Process a parse object that represents a parameter type list in
662 * method, function, and external declarations.
664 ******************************************************************************/
667 MtProcessParameterTypeList (
668 ACPI_PARSE_OBJECT *ParamTypeOp,
671 UINT8 ParameterCount = 0;
676 TypeList[ParameterCount] =
677 MtProcessTypeOp (ParamTypeOp->Asl.Child);
680 ParamTypeOp = ParamTypeOp->Asl.Next;
683 return (ParameterCount);
687 /*******************************************************************************
689 * FUNCTION: MtCheckNamedObjectInMethod
691 * PARAMETERS: Op - Current parser op
692 * MethodInfo - Info for method being parsed
696 * DESCRIPTION: Detect if a non-serialized method is creating a named object,
697 * which could possibly cause problems if two threads execute
698 * the method concurrently. Emit a remark in this case.
700 ******************************************************************************/
703 MtCheckNamedObjectInMethod (
704 ACPI_PARSE_OBJECT *Op,
705 ASL_METHOD_INFO *MethodInfo)
707 const ACPI_OPCODE_INFO *OpInfo;
711 /* We don't care about actual method declarations or scopes */
713 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) ||
714 (Op->Asl.AmlOpcode == AML_SCOPE_OP))
719 /* Determine if we are creating a named object within a method */
726 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
727 if (OpInfo->Class == AML_CLASS_NAMED_OBJECT)
730 * 1) Mark the method as a method that creates named objects.
732 * 2) Issue a remark indicating the inefficiency of creating named
733 * objects within a method (Except for compiler-emitted temporary
736 * 3) If the method is non-serialized, emit a remark that the method
737 * should be serialized.
739 * Reason: If a thread blocks within the method for any reason, and
740 * another thread enters the method, the method will fail because
741 * an attempt will be made to create the same object twice.
743 ExternalPath = AcpiNsGetNormalizedPathname (MethodInfo->Op->Asl.Node, TRUE);
745 /* No error for compiler temp variables (name starts with "_T_") */
747 if ((Op->Asl.NameSeg[0] != '_') &&
748 (Op->Asl.NameSeg[1] != 'T') &&
749 (Op->Asl.NameSeg[2] != '_'))
751 AslError (ASL_REMARK, ASL_MSG_NAMED_OBJECT_CREATION, Op,
755 MethodInfo->CreatesNamedObjects = TRUE;
756 if (!MethodInfo->ShouldBeSerialized)
758 AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op,
761 /* Emit message only ONCE per method */
763 MethodInfo->ShouldBeSerialized = TRUE;
768 ACPI_FREE (ExternalPath);
774 /*******************************************************************************
776 * FUNCTION: MtCheckStaticOperationRegionInMethod
778 * PARAMETERS: Op - Current parser op
782 * DESCRIPTION: Warns if an Operation Region with static address or length
783 * is declared inside a control method
785 ******************************************************************************/
788 MtCheckStaticOperationRegionInMethod(
789 ACPI_PARSE_OBJECT* Op)
791 ACPI_PARSE_OBJECT* AddressOp;
792 ACPI_PARSE_OBJECT* LengthOp;
795 if (Op->Asl.ParseOpcode != PARSEOP_OPERATIONREGION)
801 * OperationRegion should have 4 arguments defined. At this point, we
802 * assume that the parse tree is well-formed.
804 AddressOp = Op->Asl.Child->Asl.Next->Asl.Next;
805 LengthOp = Op->Asl.Child->Asl.Next->Asl.Next->Asl.Next;
807 if (UtGetParentMethodOp (Op) &&
808 AddressOp->Asl.ParseOpcode == PARSEOP_INTEGER &&
809 LengthOp->Asl.ParseOpcode == PARSEOP_INTEGER)
812 * At this point, a static operation region declared inside of a
813 * control method has been found. Throw a warning because this is
814 * highly inefficient.
816 AslError(ASL_WARNING, ASL_MSG_STATIC_OPREGION_IN_METHOD, Op, NULL);
823 /*******************************************************************************
825 * FUNCTION: MtMethodAnalysisWalkEnd
827 * PARAMETERS: ASL_WALK_CALLBACK
831 * DESCRIPTION: Ascending callback for analysis walk. Complete method
834 ******************************************************************************/
837 MtMethodAnalysisWalkEnd (
838 ACPI_PARSE_OBJECT *Op,
842 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
843 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
847 switch (Op->Asl.ParseOpcode)
854 printf ("No method info for method! [%s]\n", Op->Asl.Namepath);
855 AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op,
856 "No method info for this method");
859 return (AE_AML_INTERNAL);
868 switch (Op->Asl.ParseOpcode)
872 WalkInfo->MethodStack = MethodInfo->Next;
875 * Check if there is no return statement at the end of the
876 * method AND we can actually get there -- i.e., the execution
877 * of the method can possibly terminate without a return statement.
879 if ((!AnLastStatementIsReturn (Op)) &&
880 (!(Op->Asl.CompileFlags & OP_HAS_NO_EXIT)))
883 * No return statement, and execution can possibly exit
884 * via this path. This is equivalent to Return ()
886 MethodInfo->NumReturnNoValue++;
890 * Check for case where some return statements have a return value
891 * and some do not. Exit without a return statement is a return with
894 if (MethodInfo->NumReturnNoValue &&
895 MethodInfo->NumReturnWithValue)
897 ExternalPath = AcpiNsGetNormalizedPathname (Op->Asl.Node, TRUE);
899 AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op,
904 ACPI_FREE (ExternalPath);
909 * If there are any RETURN() statements with no value, or there is a
910 * control path that allows the method to exit without a return value,
911 * we mark the method as a method that does not return a value. This
912 * knowledge can be used to check method invocations that expect a
915 if (MethodInfo->NumReturnNoValue)
917 if (MethodInfo->NumReturnWithValue)
919 Op->Asl.CompileFlags |= OP_METHOD_SOME_NO_RETVAL;
923 Op->Asl.CompileFlags |= OP_METHOD_NO_RETVAL;
928 * Check predefined method names for correct return behavior
929 * and correct number of arguments. Also, some special checks
930 * For GPE and _REG methods.
932 if (ApCheckForPredefinedMethod (Op, MethodInfo))
934 /* Special check for two names like _L01 and _E01 in same scope */
936 ApCheckForGpeNameConflict (Op);
939 * Special check for _REG: Must have an operation region definition
940 * within the same scope!
942 ApCheckRegMethod (Op);
945 ACPI_FREE (MethodInfo);
950 /* Special check for two names like _L01 and _E01 in same scope */
952 ApCheckForGpeNameConflict (Op);
958 * If the parent is a predefined method name, attempt to typecheck
959 * the return value. Only static types can be validated.
961 ApCheckPredefinedReturnValue (Op, MethodInfo);
964 * The parent block does not "exit" and continue execution -- the
965 * method is terminated here with the Return() statement.
967 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
969 /* Used in the "typing" pass later */
971 Op->Asl.ParentMethod = MethodInfo->Op;
974 * If there is a peer node after the return statement, then this
975 * node is unreachable code -- i.e., it won't be executed because of
976 * the preceding Return() statement.
980 AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE,
987 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
989 (Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE))
992 * This IF has a corresponding ELSE. The IF block has no exit,
993 * (it contains an unconditional Return)
994 * mark the ELSE block to remember this fact.
996 Op->Asl.Next->Asl.CompileFlags |= OP_IF_HAS_NO_EXIT;
1002 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
1003 (Op->Asl.CompileFlags & OP_IF_HAS_NO_EXIT))
1006 * This ELSE block has no exit and the corresponding IF block
1007 * has no exit either. Therefore, the parent node has no exit.
1009 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
1016 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
1019 /* If this node has no exit, then the parent has no exit either */
1021 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;