FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/parser/psparse.c

     /******************************************************************************
      *
      * Module Name: psparse - Parser top level AML parse routines
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 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.
    *
    *****************************************************************************/
   
   /*
    * Parse the AML and build an operation tree as most interpreters,
    * like Perl, do. Parsing is done by hand rather than with a YACC
    * generated parser to tightly constrain stack and dynamic memory
    * usage. At the same time, parsing is kept flexible and the code
    * fairly compact by parsing based on a list of AML opcode
    * templates in AmlOpInfo[]
    */
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acparser.h>
   #include <contrib/dev/acpica/include/acdispat.h>
   #include <contrib/dev/acpica/include/amlcode.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   
   #define _COMPONENT          ACPI_PARSER
           ACPI_MODULE_NAME    ("psparse")
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiPsGetOpcodeSize
    *
    * PARAMETERS:  Opcode          - An AML opcode
    *
    * RETURN:      Size of the opcode, in bytes (1 or 2)
    *
    * DESCRIPTION: Get the size of the current opcode.
    *
    ******************************************************************************/
   
   UINT32
   AcpiPsGetOpcodeSize (
       UINT32                  Opcode)
   {
   
       /* Extended (2-byte) opcode if > 255 */
   
       if (Opcode > 0x00FF)
       {
           return (2);
       }
   
       /* Otherwise, just a single byte opcode */
   
       return (1);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiPsPeekOpcode
    *
    * PARAMETERS:  ParserState         - A parser state object
    *
    * RETURN:      Next AML opcode
    *
    * DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
    *
    ******************************************************************************/
   
   UINT16
   AcpiPsPeekOpcode (
       ACPI_PARSE_STATE        *ParserState)
   {
       UINT8                   *Aml;
       UINT16                  Opcode;
   
   
       Aml = ParserState->Aml;
       Opcode = (UINT16) ACPI_GET8 (Aml);
   
       if (Opcode == AML_EXTENDED_PREFIX)
       {
           /* Extended opcode, get the second opcode byte */
   
           Aml++;
           Opcode = (UINT16) ((Opcode << 8) | ACPI_GET8 (Aml));
       }
   
       return (Opcode);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiPsCompleteThisOp
    *
    * PARAMETERS:  WalkState       - Current State
    *              Op              - Op to complete
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Perform any cleanup at the completion of an Op.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiPsCompleteThisOp (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *Op)
   {
       ACPI_PARSE_OBJECT       *Prev;
       ACPI_PARSE_OBJECT       *Next;
       const ACPI_OPCODE_INFO  *ParentInfo;
       ACPI_PARSE_OBJECT       *ReplacementOp = NULL;
       ACPI_STATUS             Status = AE_OK;
   
   
       ACPI_FUNCTION_TRACE_PTR (PsCompleteThisOp, Op);
   
   
       /* Check for null Op, can happen if AML code is corrupt */
   
       if (!Op)
       {
           return_ACPI_STATUS (AE_OK);  /* OK for now */
       }
   
       AcpiExStopTraceOpcode (Op, WalkState);
   
       /* Delete this op and the subtree below it if asked to */
   
       if (((WalkState->ParseFlags & ACPI_PARSE_TREE_MASK) != ACPI_PARSE_DELETE_TREE) ||
            (WalkState->OpInfo->Class == AML_CLASS_ARGUMENT))
       {
           return_ACPI_STATUS (AE_OK);
       }
   
       /* Make sure that we only delete this subtree */
   
       if (Op->Common.Parent)
       {
           Prev = Op->Common.Parent->Common.Value.Arg;
           if (!Prev)
           {
               /* Nothing more to do */
   
               goto Cleanup;
           }
   
           /*
            * Check if we need to replace the operator and its subtree
            * with a return value op (placeholder op)
            */
           ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
   
           switch (ParentInfo->Class)
           {
           case AML_CLASS_CONTROL:
   
               break;
   
           case AML_CLASS_CREATE:
               /*
                * These opcodes contain TermArg operands. The current
                * op must be replaced by a placeholder return op
                */
               ReplacementOp = AcpiPsAllocOp (
                   AML_INT_RETURN_VALUE_OP, Op->Common.Aml);
               if (!ReplacementOp)
               {
                   Status = AE_NO_MEMORY;
               }
               break;
   
           case AML_CLASS_NAMED_OBJECT:
               /*
                * These opcodes contain TermArg operands. The current
                * op must be replaced by a placeholder return op
                */
               if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP)       ||
                   (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP)  ||
                   (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP)       ||
                   (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP)      ||
                   (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP)   ||
                   (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP))
               {
                   ReplacementOp = AcpiPsAllocOp (
                       AML_INT_RETURN_VALUE_OP, Op->Common.Aml);
                   if (!ReplacementOp)
                   {
                       Status = AE_NO_MEMORY;
                   }
               }
               else if ((Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
                        (WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
               {
                   if ((Op->Common.AmlOpcode == AML_BUFFER_OP) ||
                       (Op->Common.AmlOpcode == AML_PACKAGE_OP) ||
                       (Op->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP))
                   {
                       ReplacementOp = AcpiPsAllocOp (Op->Common.AmlOpcode,
                           Op->Common.Aml);
                       if (!ReplacementOp)
                       {
                           Status = AE_NO_MEMORY;
                       }
                       else
                       {
                           ReplacementOp->Named.Data = Op->Named.Data;
                           ReplacementOp->Named.Length = Op->Named.Length;
                       }
                   }
               }
               break;
   
           default:
   
               ReplacementOp = AcpiPsAllocOp (
                   AML_INT_RETURN_VALUE_OP, Op->Common.Aml);
               if (!ReplacementOp)
               {
                   Status = AE_NO_MEMORY;
               }
           }
   
           /* We must unlink this op from the parent tree */
   
           if (Prev == Op)
           {
               /* This op is the first in the list */
   
               if (ReplacementOp)
               {
                   ReplacementOp->Common.Parent = Op->Common.Parent;
                   ReplacementOp->Common.Value.Arg = NULL;
                   ReplacementOp->Common.Node = Op->Common.Node;
                   Op->Common.Parent->Common.Value.Arg = ReplacementOp;
                   ReplacementOp->Common.Next = Op->Common.Next;
               }
               else
               {
                   Op->Common.Parent->Common.Value.Arg = Op->Common.Next;
               }
           }
   
           /* Search the parent list */
   
           else while (Prev)
           {
               /* Traverse all siblings in the parent's argument list */
   
               Next = Prev->Common.Next;
               if (Next == Op)
               {
                   if (ReplacementOp)
                   {
                       ReplacementOp->Common.Parent = Op->Common.Parent;
                       ReplacementOp->Common.Value.Arg = NULL;
                       ReplacementOp->Common.Node = Op->Common.Node;
                       Prev->Common.Next = ReplacementOp;
                       ReplacementOp->Common.Next = Op->Common.Next;
                       Next = NULL;
                   }
                   else
                   {
                       Prev->Common.Next = Op->Common.Next;
                       Next = NULL;
                   }
               }
               Prev = Next;
           }
       }
   
   
   Cleanup:
   
       /* Now we can actually delete the subtree rooted at Op */
   
       AcpiPsDeleteParseTree (Op);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiPsNextParseState
    *
    * PARAMETERS:  WalkState           - Current state
    *              Op                  - Current parse op
    *              CallbackStatus      - Status from previous operation
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Update the parser state based upon the return exception from
    *              the parser callback.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiPsNextParseState (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *Op,
       ACPI_STATUS             CallbackStatus)
   {
       ACPI_PARSE_STATE        *ParserState = &WalkState->ParserState;
       ACPI_STATUS             Status = AE_CTRL_PENDING;
   
   
       ACPI_FUNCTION_TRACE_PTR (PsNextParseState, Op);
   
   
       switch (CallbackStatus)
       {
       case AE_CTRL_TERMINATE:
           /*
            * A control method was terminated via a RETURN statement.
            * The walk of this method is complete.
            */
           ParserState->Aml = ParserState->AmlEnd;
           Status = AE_CTRL_TERMINATE;
           break;
   
       case AE_CTRL_BREAK:
   
           ParserState->Aml = WalkState->AmlLastWhile;
           WalkState->ControlState->Common.Value = FALSE;
           Status = AE_CTRL_BREAK;
           break;
   
       case AE_CTRL_CONTINUE:
   
           ParserState->Aml = WalkState->AmlLastWhile;
           Status = AE_CTRL_CONTINUE;
           break;
   
       case AE_CTRL_PENDING:
   
           ParserState->Aml = WalkState->AmlLastWhile;
           break;
   
   #if 0
       case AE_CTRL_SKIP:
   
           ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
           Status = AE_OK;
           break;
   #endif
   
       case AE_CTRL_TRUE:
           /*
            * Predicate of an IF was true, and we are at the matching ELSE.
            * Just close out this package
            */
           ParserState->Aml = AcpiPsGetNextPackageEnd (ParserState);
           Status = AE_CTRL_PENDING;
           break;
   
       case AE_CTRL_FALSE:
           /*
            * Either an IF/WHILE Predicate was false or we encountered a BREAK
            * opcode. In both cases, we do not execute the rest of the
            * package;  We simply close out the parent (finishing the walk of
            * this branch of the tree) and continue execution at the parent
            * level.
            */
           ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
   
           /* In the case of a BREAK, just force a predicate (if any) to FALSE */
   
           WalkState->ControlState->Common.Value = FALSE;
           Status = AE_CTRL_END;
           break;
   
       case AE_CTRL_TRANSFER:
   
           /* A method call (invocation) -- transfer control */
   
           Status = AE_CTRL_TRANSFER;
           WalkState->PrevOp = Op;
           WalkState->MethodCallOp = Op;
           WalkState->MethodCallNode = (Op->Common.Value.Arg)->Common.Node;
   
           /* Will return value (if any) be used by the caller? */
   
           WalkState->ReturnUsed = AcpiDsIsResultUsed (Op, WalkState);
           break;
   
       default:
   
           Status = CallbackStatus;
           if (ACPI_CNTL_EXCEPTION (CallbackStatus))
           {
               Status = AE_OK;
           }
           break;
       }
   
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiPsParseAml
    *
    * PARAMETERS:  WalkState       - Current state
    *
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Parse raw AML and return a tree of ops
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiPsParseAml (
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_STATUS             Status;
       ACPI_THREAD_STATE       *Thread;
       ACPI_THREAD_STATE       *PrevWalkList = AcpiGbl_CurrentWalkList;
       ACPI_WALK_STATE         *PreviousWalkState;
   
   
       ACPI_FUNCTION_TRACE (PsParseAml);
   
       ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
           "Entered with WalkState=%p Aml=%p size=%X\n",
           WalkState, WalkState->ParserState.Aml,
           WalkState->ParserState.AmlSize));
   
       if (!WalkState->ParserState.Aml)
       {
           return_ACPI_STATUS (AE_BAD_ADDRESS);
       }
   
       /* Create and initialize a new thread state */
   
       Thread = AcpiUtCreateThreadState ();
       if (!Thread)
       {
           if (WalkState->MethodDesc)
           {
               /* Executing a control method - additional cleanup */
   
               AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
           }
   
           AcpiDsDeleteWalkState (WalkState);
           return_ACPI_STATUS (AE_NO_MEMORY);
       }
   
       WalkState->Thread = Thread;
   
       /*
        * If executing a method, the starting SyncLevel is this method's
        * SyncLevel
        */
       if (WalkState->MethodDesc)
       {
           WalkState->Thread->CurrentSyncLevel =
               WalkState->MethodDesc->Method.SyncLevel;
       }
   
       AcpiDsPushWalkState (WalkState, Thread);
   
       /*
        * This global allows the AML debugger to get a handle to the currently
        * executing control method.
        */
       AcpiGbl_CurrentWalkList = Thread;
   
       /*
        * Execute the walk loop as long as there is a valid Walk State. This
        * handles nested control method invocations without recursion.
        */
       ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", WalkState));
   
       Status = AE_OK;
       while (WalkState)
       {
           if (ACPI_SUCCESS (Status))
           {
               /*
                * The ParseLoop executes AML until the method terminates
                * or calls another method.
                */
               Status = AcpiPsParseLoop (WalkState);
           }
   
           ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
               "Completed one call to walk loop, %s State=%p\n",
               AcpiFormatException (Status), WalkState));
   
           if (WalkState->MethodPathname && WalkState->MethodIsNested)
           {
               /* Optional object evaluation log */
   
               ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EVALUATION, "%-26s:  %*s%s\n",
                   "   Exit nested method",
                   (WalkState->MethodNestingDepth + 1) * 3, " ",
                   &WalkState->MethodPathname[1]));
   
               ACPI_FREE (WalkState->MethodPathname);
               WalkState->MethodIsNested = FALSE;
           }
           if (Status == AE_CTRL_TRANSFER)
           {
               /*
                * A method call was detected.
                * Transfer control to the called control method
                */
               Status = AcpiDsCallControlMethod (Thread, WalkState, NULL);
               if (ACPI_FAILURE (Status))
               {
                   Status = AcpiDsMethodError (Status, WalkState);
               }
   
               /*
                * If the transfer to the new method method call worked,
                * a new walk state was created -- get it
                */
               WalkState = AcpiDsGetCurrentWalkState (Thread);
               continue;
           }
           else if (Status == AE_CTRL_TERMINATE)
           {
               Status = AE_OK;
           }
           else if ((Status != AE_OK) && (WalkState->MethodDesc))
           {
               /* Either the method parse or actual execution failed */
   
               AcpiExExitInterpreter ();
               if (Status == AE_ABORT_METHOD)
               {
                   AcpiNsPrintNodePathname (
                       WalkState->MethodNode, "Aborting method");
                   AcpiOsPrintf ("\n");
               }
               else
               {
                   ACPI_ERROR_METHOD ("Aborting method",
                       WalkState->MethodNode, NULL, Status);
               }
               AcpiExEnterInterpreter ();
   
               /* Check for possible multi-thread reentrancy problem */
   
               if ((Status == AE_ALREADY_EXISTS) &&
                   (!(WalkState->MethodDesc->Method.InfoFlags &
                       ACPI_METHOD_SERIALIZED)))
               {
                   /*
                    * Method is not serialized and tried to create an object
                    * twice. The probable cause is that the method cannot
                    * handle reentrancy. Mark as "pending serialized" now, and
                    * then mark "serialized" when the last thread exits.
                    */
                   WalkState->MethodDesc->Method.InfoFlags |=
                       ACPI_METHOD_SERIALIZED_PENDING;
               }
           }
   
           /* We are done with this walk, move on to the parent if any */
   
           WalkState = AcpiDsPopWalkState (Thread);
   
           /* Reset the current scope to the beginning of scope stack */
   
           AcpiDsScopeStackClear (WalkState);
   
           /*
            * If we just returned from the execution of a control method or if we
            * encountered an error during the method parse phase, there's lots of
            * cleanup to do
            */
           if (((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) ==
               ACPI_PARSE_EXECUTE &&
               !(WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL)) ||
               (ACPI_FAILURE (Status)))
           {
               AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
           }
   
           /* Delete this walk state and all linked control states */
   
           AcpiPsCleanupScope (&WalkState->ParserState);
           PreviousWalkState = WalkState;
   
           ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
               "ReturnValue=%p, ImplicitValue=%p State=%p\n",
               WalkState->ReturnDesc, WalkState->ImplicitReturnObj, WalkState));
   
           /* Check if we have restarted a preempted walk */
   
           WalkState = AcpiDsGetCurrentWalkState (Thread);
           if (WalkState)
           {
               if (ACPI_SUCCESS (Status))
               {
                   /*
                    * There is another walk state, restart it.
                    * If the method return value is not used by the parent,
                    * The object is deleted
                    */
                   if (!PreviousWalkState->ReturnDesc)
                   {
                       /*
                        * In slack mode execution, if there is no return value
                        * we should implicitly return zero (0) as a default value.
                        */
                       if (AcpiGbl_EnableInterpreterSlack &&
                           !PreviousWalkState->ImplicitReturnObj)
                       {
                           PreviousWalkState->ImplicitReturnObj =
                               AcpiUtCreateIntegerObject ((UINT64) 0);
                           if (!PreviousWalkState->ImplicitReturnObj)
                           {
                               return_ACPI_STATUS (AE_NO_MEMORY);
                           }
                       }
   
                       /* Restart the calling control method */
   
                       Status = AcpiDsRestartControlMethod (WalkState,
                           PreviousWalkState->ImplicitReturnObj);
                   }
                   else
                   {
                       /*
                        * We have a valid return value, delete any implicit
                        * return value.
                        */
                       AcpiDsClearImplicitReturn (PreviousWalkState);
   
                       Status = AcpiDsRestartControlMethod (WalkState,
                           PreviousWalkState->ReturnDesc);
                   }
                   if (ACPI_SUCCESS (Status))
                   {
                       WalkState->WalkType |= ACPI_WALK_METHOD_RESTART;
                   }
               }
               else
               {
                   /* On error, delete any return object or implicit return */
   
                   AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
                   AcpiDsClearImplicitReturn (PreviousWalkState);
               }
           }
   
           /*
            * Just completed a 1st-level method, save the final internal return
            * value (if any)
            */
           else if (PreviousWalkState->CallerReturnDesc)
           {
               if (PreviousWalkState->ImplicitReturnObj)
               {
                   *(PreviousWalkState->CallerReturnDesc) =
                       PreviousWalkState->ImplicitReturnObj;
               }
               else
               {
                    /* NULL if no return value */
   
                   *(PreviousWalkState->CallerReturnDesc) =
                       PreviousWalkState->ReturnDesc;
               }
           }
           else
           {
               if (PreviousWalkState->ReturnDesc)
               {
                   /* Caller doesn't want it, must delete it */
   
                   AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
               }
               if (PreviousWalkState->ImplicitReturnObj)
               {
                   /* Caller doesn't want it, must delete it */
   
                   AcpiUtRemoveReference (PreviousWalkState->ImplicitReturnObj);
               }
           }
   
           AcpiDsDeleteWalkState (PreviousWalkState);
       }
   
       /* Normal exit */
   
       AcpiExReleaseAllMutexes (Thread);
       AcpiUtDeleteGenericState (ACPI_CAST_PTR (ACPI_GENERIC_STATE, Thread));
       AcpiGbl_CurrentWalkList = PrevWalkList;
       return_ACPI_STATUS (Status);
   }

Cache object: 08e7a84ed3a6e3fe99fb7c95de9bada0