FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/compiler/aslmethod.c

     /******************************************************************************
      *
      * Module Name: aslmethod.c - Control method analysis walk
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp.
     * All rights reserved.
     *
     * 2. License
     *
     * 2.1. This is your license from Intel Corp. under its intellectual property
     * rights. You may have additional license terms from the party that provided
     * you this software, covering your right to use that party's intellectual
     * property rights.
     *
     * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     * copy of the source code appearing in this file ("Covered Code") an
     * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     * base code distributed originally by Intel ("Original Intel Code") to copy,
     * make derivatives, distribute, use and display any portion of the Covered
     * Code in any form, with the right to sublicense such rights; and
     *
     * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     * license (with the right to sublicense), under only those claims of Intel
     * patents that are infringed by the Original Intel Code, to make, use, sell,
     * offer to sell, and import the Covered Code and derivative works thereof
     * solely to the minimum extent necessary to exercise the above copyright
     * license, and in no event shall the patent license extend to any additions
     * to or modifications of the Original Intel Code. No other license or right
     * is granted directly or by implication, estoppel or otherwise;
     *
     * The above copyright and patent license is granted only if the following
     * conditions are met:
     *
     * 3. Conditions
     *
     * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification with rights to further distribute source must include
     * the above Copyright Notice, the above License, this list of Conditions,
     * and the following Disclaimer and Export Compliance provision. In addition,
     * Licensee must cause all Covered Code to which Licensee contributes to
     * contain a file documenting the changes Licensee made to create that Covered
     * Code and the date of any change. Licensee must include in that file the
     * documentation of any changes made by any predecessor Licensee. Licensee
     * must include a prominent statement that the modification is derived,
     * directly or indirectly, from Original Intel Code.
     *
     * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification without rights to further distribute source must
     * include the following Disclaimer and Export Compliance provision in the
     * documentation and/or other materials provided with distribution. In
     * addition, Licensee may not authorize further sublicense of source of any
     * portion of the Covered Code, and must include terms to the effect that the
     * license from Licensee to its licensee is limited to the intellectual
     * property embodied in the software Licensee provides to its licensee, and
     * not to intellectual property embodied in modifications its licensee may
     * make.
     *
     * 3.3. Redistribution of Executable. Redistribution in executable form of any
     * substantial portion of the Covered Code or modification must reproduce the
     * above Copyright Notice, and the following Disclaimer and Export Compliance
     * provision in the documentation and/or other materials provided with the
     * distribution.
     *
     * 3.4. Intel retains all right, title, and interest in and to the Original
     * Intel Code.
     *
     * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     * Intel shall be used in advertising or otherwise to promote the sale, use or
     * other dealings in products derived from or relating to the Covered Code
     * without prior written authorization from Intel.
     *
     * 4. Disclaimer and Export Compliance
     *
     * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
     * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
     * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
     * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     * PARTICULAR PURPOSE.
     *
     * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
     * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     * LIMITED REMEDY.
     *
     * 4.3. Licensee shall not export, either directly or indirectly, any of this
    * software or system incorporating such software without first obtaining any
    * required license or other approval from the U. S. Department of Commerce or
    * any other agency or department of the United States Government. In the
    * event Licensee exports any such software from the United States or
    * re-exports any such software from a foreign destination, Licensee shall
    * ensure that the distribution and export/re-export of the software is in
    * compliance with all laws, regulations, orders, or other restrictions of the
    * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    * any of its subsidiaries will export/re-export any technical data, process,
    * software, or service, directly or indirectly, to any country for which the
    * United States government or any agency thereof requires an export license,
    * other governmental approval, or letter of assurance, without first obtaining
    * such license, approval or letter.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/compiler/aslcompiler.h>
   #include "aslcompiler.y.h"
   #include <contrib/dev/acpica/include/acnamesp.h>
   #include <contrib/dev/acpica/include/acparser.h>
   #include <contrib/dev/acpica/include/amlcode.h>
   
   
   #define _COMPONENT          ACPI_COMPILER
           ACPI_MODULE_NAME    ("aslmethod")
   
   
   /* Local prototypes */
   
   static void
   MtCheckNamedObjectInMethod (
       ACPI_PARSE_OBJECT       *Op,
       ASL_METHOD_INFO         *MethodInfo);
   
   static void
   MtCheckStaticOperationRegionInMethod (
       ACPI_PARSE_OBJECT       *Op);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    MtMethodAnalysisWalkBegin
    *
    * PARAMETERS:  ASL_WALK_CALLBACK
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Descending callback for the analysis walk. Check methods for:
    *              1) Initialized local variables
    *              2) Valid arguments
    *              3) Return types
    *
    ******************************************************************************/
   
   ACPI_STATUS
   MtMethodAnalysisWalkBegin (
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  Level,
       void                    *Context)
   {
       ASL_ANALYSIS_WALK_INFO  *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
       ASL_METHOD_INFO         *MethodInfo = WalkInfo->MethodStack;
       ACPI_PARSE_OBJECT       *Next;
       UINT32                  RegisterNumber;
       UINT32                  i;
       char                    LocalName[] = "Local0";
       char                    ArgName[] = "Arg0";
       ACPI_PARSE_OBJECT       *ArgNode;
       ACPI_PARSE_OBJECT       *NextType;
       UINT8                   ActualArgs = 0;
       BOOLEAN                 HidExists;
       BOOLEAN                 AdrExists;
       BOOLEAN                 PrsExists;
       BOOLEAN                 CrsExists;
       BOOLEAN                 SrsExists;
       BOOLEAN                 DisExists;
   
   
       /* Build cross-reference output file if requested */
   
       if (AslGbl_CrossReferenceOutput)
       {
           OtXrefWalkPart1 (Op, Level, MethodInfo);
       }
   
       switch (Op->Asl.ParseOpcode)
       {
       case PARSEOP_METHOD:
   
           AslGbl_TotalMethods++;
   
           /* Create and init method info */
   
           MethodInfo = UtLocalCalloc (sizeof (ASL_METHOD_INFO));
           MethodInfo->Next = WalkInfo->MethodStack;
           MethodInfo->Op = Op;
   
           WalkInfo->MethodStack = MethodInfo;
   
           /*
            * Special handling for _PSx methods. Dependency rules (same scope):
            *
            * 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3
            * 2) _PS1/_PS2/_PS3: A _PS0 must exist
            */
           if (ACPI_COMPARE_NAMESEG (METHOD_NAME__PS0, Op->Asl.NameSeg))
           {
               /* For _PS0, one of _PS1/_PS2/_PS3 must exist */
   
               if ((!ApFindNameInScope (METHOD_NAME__PS1, Op)) &&
                   (!ApFindNameInScope (METHOD_NAME__PS2, Op)) &&
                   (!ApFindNameInScope (METHOD_NAME__PS3, Op)))
               {
                   AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
                       "_PS0 requires one of _PS1/_PS2/_PS3 in same scope");
               }
           }
           else if (
               ACPI_COMPARE_NAMESEG (METHOD_NAME__PS1, Op->Asl.NameSeg) ||
               ACPI_COMPARE_NAMESEG (METHOD_NAME__PS2, Op->Asl.NameSeg) ||
               ACPI_COMPARE_NAMESEG (METHOD_NAME__PS3, Op->Asl.NameSeg))
           {
               /* For _PS1/_PS2/_PS3, a _PS0 must exist */
   
               if (!ApFindNameInScope (METHOD_NAME__PS0, Op))
               {
                   sprintf (AslGbl_MsgBuffer,
                       "%4.4s requires _PS0 in same scope", Op->Asl.NameSeg);
   
                   AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
                       AslGbl_MsgBuffer);
               }
           }
   
           /* Get the name node */
   
           Next = Op->Asl.Child;
   
           /* Get the NumArguments node */
   
           Next = Next->Asl.Next;
           MethodInfo->NumArguments = (UINT8)
               (((UINT8) Next->Asl.Value.Integer) & 0x07);
   
           /* Get the SerializeRule and SyncLevel nodes, ignored here */
   
           Next = Next->Asl.Next;
           MethodInfo->ShouldBeSerialized = (UINT8) Next->Asl.Value.Integer;
   
           Next = Next->Asl.Next;
           ArgNode = Next;
   
           /* Get the ReturnType node */
   
           Next = Next->Asl.Next;
   
           NextType = Next->Asl.Child;
   
           MethodInfo->ValidReturnTypes = MtProcessTypeOp (NextType);
           Op->Asl.AcpiBtype |= MethodInfo->ValidReturnTypes;
   
           /* Get the ParameterType node */
   
           Next = Next->Asl.Next;
   
           NextType = Next->Asl.Child;
           if (!NextType)
           {
               /*
                * The optional parameter types list was omitted  at the source
                * level. Use the Argument count parameter instead.
                */
               ActualArgs = MethodInfo->NumArguments;
           }
           else
           {
               ActualArgs = MtProcessParameterTypeList (NextType,
                   MethodInfo->ValidArgTypes);
               MethodInfo->NumArguments = ActualArgs;
               ArgNode->Asl.Value.Integer |= ActualArgs;
           }
   
           if ((MethodInfo->NumArguments) &&
               (MethodInfo->NumArguments != ActualArgs))
           {
               sprintf (AslGbl_MsgBuffer,
                   "Length = %u", ActualArgs);
               AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_MISMATCH,
                   Op->Asl.Child->Asl.Next, AslGbl_MsgBuffer);
           }
   
           /* Allow numarguments == 0 for Function() */
   
           if ((!MethodInfo->NumArguments) && (ActualArgs))
           {
               MethodInfo->NumArguments = ActualArgs;
               ArgNode->Asl.Value.Integer |= ActualArgs;
           }
   
           /*
            * Actual arguments are initialized at method entry.
            * All other ArgX "registers" can be used as locals, so we
            * track their initialization.
            */
           for (i = 0; i < MethodInfo->NumArguments; i++)
           {
               MethodInfo->ArgInitialized[i] = TRUE;
           }
           break;
   
       case PARSEOP_METHODCALL:
   
           /* Check for a recursive method call */
   
           if (MethodInfo &&
              (Op->Asl.Node == MethodInfo->Op->Asl.Node))
           {
               if (MethodInfo->CreatesNamedObjects)
               {
                   /*
                    * This is an error, as it will fail at runtime on all ACPI
                    * implementations. Any named object declarations will be
                    * executed twice, causing failure the second time. Note,
                    * this is independent of whether the method is declared
                    * Serialized, because the same thread is attempting to
                    * reenter the method, and this will always succeed.
                    */
                   AslDualParseOpError (ASL_ERROR, ASL_MSG_ILLEGAL_RECURSION, Op,
                       Op->Asl.Value.String, ASL_MSG_FOUND_HERE, MethodInfo->Op,
                       MethodInfo->Op->Asl.ExternalName);
               }
               else
               {
                   /* Method does not create objects, issue a remark */
   
                   AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName);
               }
           }
           break;
   
       case PARSEOP_LOCAL0:
       case PARSEOP_LOCAL1:
       case PARSEOP_LOCAL2:
       case PARSEOP_LOCAL3:
       case PARSEOP_LOCAL4:
       case PARSEOP_LOCAL5:
       case PARSEOP_LOCAL6:
       case PARSEOP_LOCAL7:
   
           if (!MethodInfo)
           {
               /*
                * Local was used outside a control method, or there was an error
                * in the method declaration.
                */
               AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
                   Op, Op->Asl.ExternalName);
               return (AE_ERROR);
           }
   
           RegisterNumber = (Op->Asl.AmlOpcode & 0x0007);
   
           /*
            * If the local is being used as a target, mark the local
            * initialized
            */
           if (Op->Asl.CompileFlags & OP_IS_TARGET)
           {
               MethodInfo->LocalInitialized[RegisterNumber] = TRUE;
           }
   
           /*
            * Otherwise, this is a reference, check if the local
            * has been previously initialized.
            *
            * The only operator that accepts an uninitialized value is ObjectType()
            */
           else if ((!MethodInfo->LocalInitialized[RegisterNumber]) &&
                    (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
           {
               LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30);
               AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName);
           }
           break;
   
       case PARSEOP_ARG0:
       case PARSEOP_ARG1:
       case PARSEOP_ARG2:
       case PARSEOP_ARG3:
       case PARSEOP_ARG4:
       case PARSEOP_ARG5:
       case PARSEOP_ARG6:
   
           if (!MethodInfo)
           {
               /*
                * Arg was used outside a control method, or there was an error
                * in the method declaration.
                */
               AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
                   Op, Op->Asl.ExternalName);
               return (AE_ERROR);
           }
   
           RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8;
           ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30);
   
           /*
            * If the Arg is being used as a target, mark the local
            * initialized
            */
           if (Op->Asl.CompileFlags & OP_IS_TARGET)
           {
               MethodInfo->ArgInitialized[RegisterNumber] = TRUE;
           }
   
           /*
            * Otherwise, this is a reference, check if the Arg
            * has been previously initialized.
            *
            * The only operator that accepts an uninitialized value is ObjectType()
            */
           else if ((!MethodInfo->ArgInitialized[RegisterNumber]) &&
               (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
           {
               AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName);
           }
   
           /* Flag this arg if it is not a "real" argument to the method */
   
           if (RegisterNumber >= MethodInfo->NumArguments)
           {
               AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName);
           }
           break;
   
       case PARSEOP_RETURN:
   
           if (!MethodInfo)
           {
               /*
                * Probably was an error in the method declaration,
                * no additional error here
                */
               ACPI_WARNING ((AE_INFO, "%p, No parent method", Op));
               return (AE_ERROR);
           }
   
           /*
            * A child indicates a possible return value. A simple Return or
            * Return() is marked with OP_IS_NULL_RETURN by the parser so
            * that it is not counted as a "real" return-with-value, although
            * the AML code that is actually emitted is Return(0). The AML
            * definition of Return has a required parameter, so we are
            * forced to convert a null return to Return(0).
            */
           if ((Op->Asl.Child) &&
               (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) &&
               (!(Op->Asl.Child->Asl.CompileFlags & OP_IS_NULL_RETURN)))
           {
               MethodInfo->NumReturnWithValue++;
           }
           else
           {
               MethodInfo->NumReturnNoValue++;
           }
           break;
   
       case PARSEOP_BREAK:
       case PARSEOP_CONTINUE:
   
           Next = Op->Asl.Parent;
           while (Next)
           {
               if (Next->Asl.ParseOpcode == PARSEOP_WHILE)
               {
                   break;
               }
               Next = Next->Asl.Parent;
           }
   
           if (!Next)
           {
               AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL);
           }
           break;
   
       case PARSEOP_STALL:
   
           /* We can range check if the argument is an integer */
   
           if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) &&
               (Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX))
           {
               AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL);
           }
           break;
   
       case PARSEOP_DEVICE:
   
           /* Check usage of _HID and _ADR objects */
   
           HidExists = ApFindNameInDeviceTree (METHOD_NAME__HID, Op);
           AdrExists = ApFindNameInDeviceTree (METHOD_NAME__ADR, Op);
   
           if (!HidExists && !AdrExists)
           {
               AslError (ASL_ERROR, ASL_MSG_MISSING_DEPENDENCY, Op,
                   "Device object requires a _HID or _ADR");
           }
           else if (HidExists && AdrExists)
           {
               /*
                * According to the ACPI spec, "A device object must contain
                * either an _HID object or an _ADR object, but should not contain
                * both".
                */
               AslError (ASL_WARNING, ASL_MSG_MULTIPLE_TYPES, Op,
                   "Device object requires either a _HID or _ADR, but not both");
           }
   
           /*
            * Check usage of _CRS, _DIS, _PRS, and _SRS objects (July 2021).
            *
            * Under the Device Object:
            *
            * 1) If _PRS present, must have _CRS and _SRS
            * 2) If _SRS present, must have _PRS (_PRS requires _CRS and _SRS)
            * 3) If _DIS present, must have _SRS (_SRS requires _PRS, _PRS requires _CRS and _SRS)
            * 4) If _SRS present, probably should have a _DIS (Remark only)
            */
           CrsExists = ApFindNameInDeviceTree (METHOD_NAME__CRS, Op);
           DisExists = ApFindNameInDeviceTree (METHOD_NAME__DIS, Op);
           PrsExists = ApFindNameInDeviceTree (METHOD_NAME__PRS, Op);
           SrsExists = ApFindNameInDeviceTree (METHOD_NAME__SRS, Op);
   
           /* 1) If _PRS is present, must have a _CRS and _SRS */
   
           if (PrsExists)
           {
               if (!CrsExists)
               {
                   AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
                       "Device has a _PRS, missing a _CRS, required");
               }
               if (!SrsExists)
               {
                   AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
                       "Device has a _PRS, missing a _SRS, required");
               }
           }
   
           /* 2) If _SRS is present, must have _PRS (_PRS requires _CRS and _SRS) */
   
           if ((SrsExists) && (!PrsExists))
           {
               AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
                   "Device has a _SRS, missing a _PRS, required");
           }
   
           /* 3) If _DIS is present, must have a _SRS */
   
           if ((DisExists) && (!SrsExists))
           {
               AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
                   "Device has a _DIS, missing a _SRS, required");
           }
   
           /*
            * 4) If _SRS is present, should have a _DIS (_PRS requires _CRS
            * and _SRS)  Remark only.
            */
           if ((SrsExists) && (!DisExists))
           {
               AslError (ASL_REMARK, ASL_MSG_MISSING_DEPENDENCY, Op,
                   "Device has a _SRS, no corresponding _DIS");
           }
           break;
   
       case PARSEOP_EVENT:
       case PARSEOP_MUTEX:
       case PARSEOP_OPERATIONREGION:
       case PARSEOP_POWERRESOURCE:
       case PARSEOP_PROCESSOR:
       case PARSEOP_THERMALZONE:
   
           /*
            * The first operand is a name to be created in the namespace.
            * Check against the reserved list.
            */
           i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg);
           if (i < ACPI_VALID_RESERVED_NAME_MAX)
           {
               AslError (ASL_ERROR, ASL_MSG_RESERVED_USE,
                   Op, Op->Asl.ExternalName);
           }
   
           MtCheckStaticOperationRegionInMethod (Op);
           break;
   
       case PARSEOP_NAME:
   
           /* Typecheck any predefined names statically defined with Name() */
   
           ApCheckForPredefinedObject (Op, Op->Asl.NameSeg);
   
           /* Special typechecking for _HID */
   
           if (ACPI_COMPARE_NAMESEG (METHOD_NAME__HID, Op->Asl.NameSeg))
           {
               Next = Op->Asl.Child->Asl.Next;
               AnCheckId (Next, ASL_TYPE_HID);
           }
   
           /* Special typechecking for _CID */
   
           else if (ACPI_COMPARE_NAMESEG (METHOD_NAME__CID, Op->Asl.NameSeg))
           {
               Next = Op->Asl.Child->Asl.Next;
   
               if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) ||
                   (Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE))
               {
                   Next = Next->Asl.Child;
                   while (Next)
                   {
                       AnCheckId (Next, ASL_TYPE_CID);
                       Next = Next->Asl.Next;
                   }
               }
               else
               {
                   AnCheckId (Next, ASL_TYPE_CID);
               }
           }
   
           break;
   
       default:
   
           break;
       }
   
       /* Check for named object creation within a non-serialized method */
   
       MtCheckNamedObjectInMethod (Op, MethodInfo);
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    MtProcessTypeOp
    *
    * PARAMETERS:  Op                  - Op representing a btype
    *
    * RETURN:      Btype represented by Op
    *
    * DESCRIPTION: Process a parse object that represents single parameter type or
    *              a return type in method, function, and external declarations.
    *
    ******************************************************************************/
   
   UINT32
   MtProcessTypeOp (
       ACPI_PARSE_OBJECT       *TypeOp)
   {
       UINT32                  Btype = ACPI_BTYPE_ANY;
   
   
       while (TypeOp)
       {
           Btype |= AnMapObjTypeToBtype (TypeOp);
           TypeOp->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
           TypeOp = TypeOp->Asl.Next;
       }
   
       return (Btype);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    MtProcessParameterTypeList
    *
    * PARAMETERS:  Op                  - Op representing a btype
    *
    * RETURN:      Btype represented by Op
    *
    * DESCRIPTION: Process a parse object that represents a parameter type list in
    *              method, function, and external declarations.
    *
    ******************************************************************************/
   
   UINT8
   MtProcessParameterTypeList (
       ACPI_PARSE_OBJECT       *ParamTypeOp,
       UINT32                  *TypeList)
   {
       UINT8                   ParameterCount = 0;
   
   
       if (ParamTypeOp && ParamTypeOp->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG)
       {
           /* Special case for a single parameter without braces */
   
           TypeList[ParameterCount] =
               MtProcessTypeOp (ParamTypeOp);
   
           return (1);
       }
   
       while (ParamTypeOp)
       {
           TypeList[ParameterCount] =
               MtProcessTypeOp (ParamTypeOp->Asl.Child);
   
           ParameterCount++;
           ParamTypeOp = ParamTypeOp->Asl.Next;
       }
   
       return (ParameterCount);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    MtCheckNamedObjectInMethod
    *
    * PARAMETERS:  Op                  - Current parser op
    *              MethodInfo          - Info for method being parsed
    *
    * RETURN:      None
    *
    * DESCRIPTION: Detect if a non-serialized method is creating a named object,
    *              which could possibly cause problems if two threads execute
    *              the method concurrently. Emit a remark in this case.
    *
    ******************************************************************************/
   
   static void
   MtCheckNamedObjectInMethod (
       ACPI_PARSE_OBJECT       *Op,
       ASL_METHOD_INFO         *MethodInfo)
   {
       const ACPI_OPCODE_INFO  *OpInfo;
       char                    *ExternalPath;
   
   
       /* We don't care about actual method declarations or scopes */
   
       if ((Op->Asl.AmlOpcode == AML_METHOD_OP) ||
           (Op->Asl.AmlOpcode == AML_SCOPE_OP))
       {
           return;
       }
   
       /* Determine if we are creating a named object within a method */
   
       if (!MethodInfo)
       {
           return;
       }
   
       OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
       if ((OpInfo->Class == AML_CLASS_NAMED_OBJECT) && (Op->Asl.AmlOpcode != AML_FIELD_OP))
       {
           /*
            * 1) Mark the method as a method that creates named objects.
            *
            * 2) Issue a remark indicating the inefficiency of creating named
            * objects within a method (Except for compiler-emitted temporary
            * variables).
            *
            * 3) If the method is non-serialized, emit a remark that the method
            * should be serialized.
            *
            * Reason: If a thread blocks within the method for any reason, and
            * another thread enters the method, the method will fail because
            * an attempt will be made to create the same object twice.
            *
            * Note: The Field opcode is disallowed here because Field() does not
            * create a new named object.
            */
           ExternalPath = AcpiNsGetNormalizedPathname (MethodInfo->Op->Asl.Node, TRUE);
   
           /* No error for compiler temp variables (name starts with "_T_") */
   
           if ((Op->Asl.NameSeg[0] != '_') &&
               (Op->Asl.NameSeg[1] != 'T') &&
               (Op->Asl.NameSeg[2] != '_'))
           {
               AslError (ASL_REMARK, ASL_MSG_NAMED_OBJECT_CREATION, Op,
                   ExternalPath);
           }
   
           MethodInfo->CreatesNamedObjects = TRUE;
           if (!MethodInfo->ShouldBeSerialized)
           {
               AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op,
                   ExternalPath);
   
               /* Emit message only ONCE per method */
   
               MethodInfo->ShouldBeSerialized = TRUE;
           }
   
           if (ExternalPath)
           {
               ACPI_FREE (ExternalPath);
           }
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    MtCheckStaticOperationRegionInMethod
    *
    * PARAMETERS:  Op                  - Current parser op
    *
    * RETURN:      None
    *
    * DESCRIPTION: Warns if an Operation Region with static address or length
    *              is declared inside a control method
    *
    ******************************************************************************/
   
   static void
   MtCheckStaticOperationRegionInMethod(
       ACPI_PARSE_OBJECT*       Op)
   {
       ACPI_PARSE_OBJECT*       AddressOp;
       ACPI_PARSE_OBJECT*       LengthOp;
   
   
       if (Op->Asl.ParseOpcode != PARSEOP_OPERATIONREGION)
       {
           return;
       }
   
       /*
        * OperationRegion should have 4 arguments defined. At this point, we
        * assume that the parse tree is well-formed.
        */
       AddressOp = Op->Asl.Child->Asl.Next->Asl.Next;
       LengthOp = Op->Asl.Child->Asl.Next->Asl.Next->Asl.Next;
   
       if (UtGetParentMethodOp (Op) &&
           AddressOp->Asl.ParseOpcode == PARSEOP_INTEGER &&
           LengthOp->Asl.ParseOpcode == PARSEOP_INTEGER)
       {
           /*
            * At this point, a static operation region declared inside of a
            * control method has been found. Throw a warning because this is
            * highly inefficient.
            */
           AslError(ASL_WARNING, ASL_MSG_STATIC_OPREGION_IN_METHOD, Op, NULL);
       }
   
       return;
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    MtMethodAnalysisWalkEnd
    *
    * PARAMETERS:  ASL_WALK_CALLBACK
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Ascending callback for analysis walk. Complete method
    *              return analysis.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   MtMethodAnalysisWalkEnd (
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  Level,
       void                    *Context)
   {
       ASL_ANALYSIS_WALK_INFO  *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
       ASL_METHOD_INFO         *MethodInfo = WalkInfo->MethodStack;
       char                    *ExternalPath;
   
   
       switch (Op->Asl.ParseOpcode)
       {
       case PARSEOP_METHOD:
       case PARSEOP_RETURN:
   
           if (!MethodInfo)
           {
               printf ("No method info for method! [%s]\n", Op->Asl.Namepath);
               AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op,
                   "No method info for this method");
   
               CmCleanupAndExit ();
               return (AE_AML_INTERNAL);
           }
           break;
   
       default:
   
           break;
       }
   
       switch (Op->Asl.ParseOpcode)
       {
       case PARSEOP_METHOD:
   
           WalkInfo->MethodStack = MethodInfo->Next;
   
           /*
            * Check if there is no return statement at the end of the
            * method AND we can actually get there -- i.e., the execution
            * of the method can possibly terminate without a return statement.
            */
           if ((!AnLastStatementIsReturn (Op)) &&
               (!(Op->Asl.CompileFlags & OP_HAS_NO_EXIT)))
           {
               /*
                * No return statement, and execution can possibly exit
                * via this path. This is equivalent to Return ()
                */
               MethodInfo->NumReturnNoValue++;
           }
   
           /*
            * Check for case where some return statements have a return value
            * and some do not. Exit without a return statement is a return with
            * no value
            */
           if (MethodInfo->NumReturnNoValue &&
               MethodInfo->NumReturnWithValue)
           {
               ExternalPath = AcpiNsGetNormalizedPathname (Op->Asl.Node, TRUE);
   
               AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op,
                   ExternalPath);
   
               if (ExternalPath)
               {
                   ACPI_FREE (ExternalPath);
               }
           }
   
           /*
            * If there are any RETURN() statements with no value, or there is a
            * control path that allows the method to exit without a return value,
            * we mark the method as a method that does not return a value. This
            * knowledge can be used to check method invocations that expect a
            * returned value.
            */
           if (MethodInfo->NumReturnNoValue)
           {
               if (MethodInfo->NumReturnWithValue)
               {
                   Op->Asl.CompileFlags |= OP_METHOD_SOME_NO_RETVAL;
               }
               else
               {
                  Op->Asl.CompileFlags |= OP_METHOD_NO_RETVAL;
              }
          }
  
          /*
           * Check predefined method names for correct return behavior
           * and correct number of arguments. Also, some special checks
           * For GPE and _REG methods.
           */
          if (ApCheckForPredefinedMethod (Op, MethodInfo))
          {
              /* Special check for two names like _L01 and _E01 in same scope */
  
              ApCheckForGpeNameConflict (Op);
  
              /*
               * Special check for _REG: Must have an operation region definition
               * within the same scope!
               */
              ApCheckRegMethod (Op);
          }
  
          ACPI_FREE (MethodInfo);
          break;
  
      case PARSEOP_NAME:
  
           /* Special check for two names like _L01 and _E01 in same scope */
  
          ApCheckForGpeNameConflict (Op);
          break;
  
      case PARSEOP_RETURN:
  
          /*
           * If the parent is a predefined method name, attempt to typecheck
           * the return value. Only static types can be validated.
           */
          ApCheckPredefinedReturnValue (Op, MethodInfo);
  
          /*
           * The parent block does not "exit" and continue execution -- the
           * method is terminated here with the Return() statement.
           */
          Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
  
          /* Used in the "typing" pass later */
  
          Op->Asl.ParentMethod = MethodInfo->Op;
  
          /*
           * If there is a peer node after the return statement, then this
           * node is unreachable code -- i.e., it won't be executed because of
           * the preceding Return() statement.
           */
          if (Op->Asl.Next)
          {
              AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE,
                  Op->Asl.Next, NULL);
          }
          break;
  
      case PARSEOP_IF:
  
          if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
              (Op->Asl.Next) &&
              (Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE))
          {
              /*
               * This IF has a corresponding ELSE. The IF block has no exit,
               * (it contains an unconditional Return)
               * mark the ELSE block to remember this fact.
               */
              Op->Asl.Next->Asl.CompileFlags |= OP_IF_HAS_NO_EXIT;
          }
          break;
  
      case PARSEOP_ELSE:
  
          if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
              (Op->Asl.CompileFlags & OP_IF_HAS_NO_EXIT))
          {
              /*
               * This ELSE block has no exit and the corresponding IF block
               * has no exit either. Therefore, the parent node has no exit.
               */
              Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
          }
          break;
  
  
      default:
  
          if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
              (Op->Asl.Parent))
          {
              /* If this node has no exit, then the parent has no exit either */
  
              Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
          }
          break;
      }
  
      return (AE_OK);
  }

Cache object: 36f2b7feeb64ef8b86f5bdd0f214b90a