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

     /******************************************************************************
      *
      * Module Name: asltree - Parse tree management
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 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/acapps.h>
   
   #define _COMPONENT          ACPI_COMPILER
           ACPI_MODULE_NAME    ("asltree")
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrSetOpIntegerValue
    *
    * PARAMETERS:  ParseOpcode         - New opcode to be assigned to the op
    *              Op                  - An existing parse op
    *
    * RETURN:      The updated op
    *
    * DESCRIPTION: Used to set the integer value of a op,
    *              usually to a specific size (8, 16, 32, or 64 bits)
    *
    ******************************************************************************/
   
   ACPI_PARSE_OBJECT *
   TrSetOpIntegerValue (
       UINT32                  ParseOpcode,
       ACPI_PARSE_OBJECT       *Op)
   {
   
       if (!Op)
       {
           return (NULL);
       }
   
       DbgPrint (ASL_PARSE_OUTPUT,
           "\nUpdateOp: Old - %s, New - %s\n",
           UtGetOpName (Op->Asl.ParseOpcode),
           UtGetOpName (ParseOpcode));
   
       /* Assign new opcode and name */
   
       if (Op->Asl.ParseOpcode == PARSEOP_ONES)
       {
           switch (ParseOpcode)
           {
           case PARSEOP_BYTECONST:
   
               Op->Asl.Value.Integer = ACPI_UINT8_MAX;
               break;
   
           case PARSEOP_WORDCONST:
   
               Op->Asl.Value.Integer = ACPI_UINT16_MAX;
               break;
   
           case PARSEOP_DWORDCONST:
   
               Op->Asl.Value.Integer = ACPI_UINT32_MAX;
               break;
   
           /* Don't need to do the QWORD case */
   
           default:
   
               /* Don't care about others */
               break;
           }
       }
   
       Op->Asl.ParseOpcode = (UINT16) ParseOpcode;
       UtSetParseOpName (Op);
   
       /*
        * For the BYTE, WORD, and DWORD constants, make sure that the integer
        * that was passed in will actually fit into the data type
        */
       switch (ParseOpcode)
       {
       case PARSEOP_BYTECONST:
   
           UtCheckIntegerRange (Op, 0x00, ACPI_UINT8_MAX);
           Op->Asl.Value.Integer &= ACPI_UINT8_MAX;
           break;
   
       case PARSEOP_WORDCONST:
   
           UtCheckIntegerRange (Op, 0x00, ACPI_UINT16_MAX);
           Op->Asl.Value.Integer &= ACPI_UINT16_MAX;
           break;
   
       case PARSEOP_DWORDCONST:
   
           UtCheckIntegerRange (Op, 0x00, ACPI_UINT32_MAX);
           Op->Asl.Value.Integer &= ACPI_UINT32_MAX;
           break;
   
       default:
   
           /* Don't care about others, don't need to check QWORD */
   
           break;
       }
   
       /* Converter: if this is a method invocation, turn off capture comments */
   
       if (AcpiGbl_CaptureComments &&
           (ParseOpcode == PARSEOP_METHODCALL))
       {
           AslGbl_CommentState.CaptureComments = FALSE;
       }
   
       return (Op);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrSetOpFlags
    *
    * PARAMETERS:  Op                  - An existing parse op
    *              Flags               - New flags word
    *
    * RETURN:      The updated parser op
    *
    * DESCRIPTION: Set bits in the op flags word. Will not clear bits, only set
    *
    ******************************************************************************/
   
   ACPI_PARSE_OBJECT *
   TrSetOpFlags (
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  Flags)
   {
   
       if (!Op)
       {
           return (NULL);
       }
   
       DbgPrint (ASL_PARSE_OUTPUT,
           "\nSetOpFlags: %s Op %p, %8.8X", Op->Asl.ParseOpName, Op, Flags);
   
       TrPrintOpFlags (Flags, ASL_PARSE_OUTPUT);
       DbgPrint (ASL_PARSE_OUTPUT, "\n\n");
   
       Op->Asl.CompileFlags |= Flags;
       return (Op);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrSetOpAmlLength
    *
    * PARAMETERS:  Op                  - An existing parse op
    *              Length              - AML Length
    *
    * RETURN:      The updated parser op
    *
    * DESCRIPTION: Set the AML Length in a op. Used by the parser to indicate
    *              the presence of a op that must be reduced to a fixed length
    *              constant.
    *
    ******************************************************************************/
   
   ACPI_PARSE_OBJECT *
   TrSetOpAmlLength (
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  Length)
   {
   
       DbgPrint (ASL_PARSE_OUTPUT,
           "\nSetOpAmlLength: Op %p, %8.8X\n", Op, Length);
   
       if (!Op)
       {
           return (NULL);
       }
   
       Op->Asl.AmlLength = Length;
       return (Op);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrSetOpParent
    *
    * PARAMETERS:  Op                  - To be set to new parent
    *              ParentOp            - The parent
    *
    * RETURN:      None, sets Op parent directly
    *
    * DESCRIPTION: Change the parent of a parse op.
    *
    ******************************************************************************/
   
   void
   TrSetOpParent (
       ACPI_PARSE_OBJECT       *Op,
       ACPI_PARSE_OBJECT       *ParentOp)
   {
   
       Op->Asl.Parent = ParentOp;
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrSetOpCurrentFilename
    *
    * PARAMETERS:  Op                  - An existing parse op
    *
    * RETURN:      None
    *
    * DESCRIPTION: Save the include file filename. Used for debug output only.
    *
    ******************************************************************************/
   
   void
   TrSetOpCurrentFilename (
       ACPI_PARSE_OBJECT       *Op)
   {
   
       Op->Asl.Filename = AslGbl_PreviousIncludeFilename;
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrSetOpIntegerWidth
    *
    * PARAMETERS:  Op                  - An existing parse op
    *
    * RETURN:      None
    *
    * DESCRIPTION:
    *
    ******************************************************************************/
   
   void
   TrSetOpIntegerWidth (
       ACPI_PARSE_OBJECT       *TableSignatureOp,
       ACPI_PARSE_OBJECT       *RevisionOp)
   {
   
       /* TBD: Check table sig? (DSDT vs. SSDT) */
   
       /* Handle command-line version override */
   
       if (AslGbl_RevisionOverride)
       {
           AcpiUtSetIntegerWidth (AslGbl_RevisionOverride);
       }
       else
       {
           AcpiUtSetIntegerWidth ((UINT8) RevisionOp->Asl.Value.Integer);
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrSetOpEndLineNumber
    *
    * PARAMETERS:  Op                - An existing parse op
    *
    * RETURN:      None.
    *
    * DESCRIPTION: Set the ending line numbers (file line and logical line) of a
    *              parse op to the current line numbers.
    *
    ******************************************************************************/
   
   void
   TrSetOpEndLineNumber (
       ACPI_PARSE_OBJECT       *Op)
   {
   
       /* If the end line # is already set, just return */
   
       if (Op->Asl.EndLine)
       {
           return;
       }
   
       Op->Asl.EndLine = AslGbl_CurrentLineNumber;
       Op->Asl.EndLogicalLine = AslGbl_LogicalLineNumber;
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrLinkOpChildren
    *
    * PARAMETERS:  Op                - An existing parse op
    *              NumChildren        - Number of children to follow
    *              ...                - A list of child ops to link to the new
    *                                   op. NumChildren long.
    *
    * RETURN:      The updated (linked) op
    *
    * DESCRIPTION: Link a group of ops to an existing parse op
    *
    ******************************************************************************/
   
   ACPI_PARSE_OBJECT *
   TrLinkOpChildren (
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  NumChildren,
       ...)
   {
       ACPI_PARSE_OBJECT       *Child;
       ACPI_PARSE_OBJECT       *PrevChild;
       ACPI_PARSE_OBJECT       *LastSibling;
       va_list                 ap;
       UINT32                  i;
       BOOLEAN                 FirstChild;
   
   
       va_start (ap, NumChildren);
   
       TrSetOpEndLineNumber (Op);
   
       DbgPrint (ASL_PARSE_OUTPUT,
           "\nLinkChildren  Line [%u to %u] NewParent %p Child %u Op %s  ",
           Op->Asl.LineNumber, Op->Asl.EndLine,
           Op, NumChildren, UtGetOpName(Op->Asl.ParseOpcode));
   
       switch (Op->Asl.ParseOpcode)
       {
       case PARSEOP_ASL_CODE:
   
           if (!AslGbl_ParseTreeRoot)
           {
               DbgPrint (ASL_PARSE_OUTPUT, "Creating first Definition Block\n");
               AslGbl_ParseTreeRoot = Op;
               Op->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
           }
           else
           {
               DbgPrint (ASL_PARSE_OUTPUT, "Creating subsequent Definition Block\n");
               Op = AslGbl_ParseTreeRoot;
           }
   
           DbgPrint (ASL_PARSE_OUTPUT, "ASLCODE (Tree Completed)->");
           break;
   
       case PARSEOP_DEFINITION_BLOCK:
   
           DbgPrint (ASL_PARSE_OUTPUT, "DEFINITION_BLOCK (Tree Completed)->");
           break;
   
       case PARSEOP_OPERATIONREGION:
   
           DbgPrint (ASL_PARSE_OUTPUT, "OPREGION->");
           break;
   
       case PARSEOP_OR:
   
           DbgPrint (ASL_PARSE_OUTPUT, "OR->");
           break;
   
       default:
   
           /* Nothing to do for other opcodes */
   
           break;
       }
   
       /* The following is for capturing comments */
   
       if (AcpiGbl_CaptureComments)
       {
           /*
            * If there are "regular comments" detected at this point,
            * then is an endBlk comment. Categorize it as so and distribute
            * all regular comments to this parse op.
            */
           if (AslGbl_CommentListHead)
           {
               Op->Asl.EndBlkComment = AslGbl_CommentListHead;
               CvDbgPrint ("EndBlk Comment for %s: %s",
                   Op->Asl.ParseOpName, AslGbl_CommentListHead->Comment);
               AslGbl_CommentListHead = NULL;
               AslGbl_CommentListTail = NULL;
           }
       }
   
       /* Link the new op to it's children */
   
       PrevChild = NULL;
       FirstChild = TRUE;
       for (i = 0; i < NumChildren; i++)
       {
           Child = va_arg (ap, ACPI_PARSE_OBJECT *);
   
           if ((Child == PrevChild) && (Child != NULL))
           {
               AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Child,
                   "Child op list invalid");
               va_end(ap);
               return (Op);
           }
   
           DbgPrint (ASL_PARSE_OUTPUT, "%p, ", Child);
   
           /*
            * If child is NULL, this means that an optional argument
            * was omitted. We must create a placeholder with a special
            * opcode (DEFAULT_ARG) so that the code generator will know
            * that it must emit the correct default for this argument
            */
           if (!Child)
           {
               Child = TrAllocateOp (PARSEOP_DEFAULT_ARG);
           }
   
           /* Link first child to parent */
   
           if (FirstChild)
           {
               FirstChild = FALSE;
   
               /*
                * In the case that multiple definition blocks are being compiled,
                * append the definition block to the end of the child list as the
                * last sibling. This is done to facilitate namespace cross-
                * reference between multiple definition blocks.
                */
               if (Op->Asl.Child &&
                   (Op->Asl.Child->Asl.ParseOpcode == PARSEOP_DEFINITION_BLOCK))
               {
                   LastSibling = Op->Asl.Child;
                   while (LastSibling->Asl.Next)
                   {
                       LastSibling = LastSibling->Asl.Next;
                   }
                   LastSibling->Asl.Next = Child;
               }
               else
               {
                   Op->Asl.Child = Child;
               }
           }
   
           /* Point all children to parent */
   
           Child->Asl.Parent = Op;
   
           /* Link children in a peer list */
   
           if (PrevChild)
           {
               PrevChild->Asl.Next = Child;
           }
   
           /*
            * This child might be a list, point all ops in the list
            * to the same parent
            */
           while (Child->Asl.Next)
           {
               Child = Child->Asl.Next;
               Child->Asl.Parent = Op;
           }
   
           PrevChild = Child;
       }
   
       va_end(ap);
       DbgPrint (ASL_PARSE_OUTPUT, "\n\n");
   
       if (AcpiGbl_CaptureComments)
       {
           AslGbl_CommentState.LatestParseOp = Op;
           CvDbgPrint ("TrLinkOpChildren=====Set latest parse op to this op.\n");
       }
   
       return (Op);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrLinkPeerOp
    *
    * PARAMETERS:  Op1           - First peer
    *              Op2           - Second peer
    *
    * RETURN:      Op1 or the non-null op.
    *
    * DESCRIPTION: Link two ops as peers. Handles cases where one peer is null.
    *
    ******************************************************************************/
   
   ACPI_PARSE_OBJECT *
   TrLinkPeerOp (
       ACPI_PARSE_OBJECT       *Op1,
       ACPI_PARSE_OBJECT       *Op2)
   {
       ACPI_PARSE_OBJECT       *Next;
   
   
       DbgPrint (ASL_PARSE_OUTPUT,
           "\nLinkPeerOp: 1=%p (%s), 2=%p (%s)\n",
           Op1, Op1 ? UtGetOpName(Op1->Asl.ParseOpcode) : NULL,
           Op2, Op2 ? UtGetOpName(Op2->Asl.ParseOpcode) : NULL);
   
   
       if ((!Op1) && (!Op2))
       {
           DbgPrint (ASL_PARSE_OUTPUT, "\nTwo Null ops!\n");
           return (Op1);
       }
   
       /* If one of the ops is null, just return the non-null op */
   
       if (!Op2)
       {
           return (Op1);
       }
   
       if (!Op1)
       {
           return (Op2);
       }
   
       if (Op1 == Op2)
       {
           DbgPrint (ASL_DEBUG_OUTPUT,
               "\n************* Internal error, linking op to itself %p\n",
               Op1);
           AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op1,
               "Linking op to itself");
           return (Op1);
       }
   
       Op1->Asl.Parent = Op2->Asl.Parent;
   
       /*
        * Op 1 may already have a peer list (such as an IF/ELSE pair),
        * so we must walk to the end of the list and attach the new
        * peer at the end
        */
       Next = Op1;
       while (Next->Asl.Next)
       {
           Next = Next->Asl.Next;
       }
   
       Next->Asl.Next = Op2;
       return (Op1);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrLinkPeerOps
    *
    * PARAMETERS:  NumPeers            - The number of ops in the list to follow
    *              ...                 - A list of ops to link together as peers
    *
    * RETURN:      The first op in the list (head of the peer list)
    *
    * DESCRIPTION: Link together an arbitrary number of peer ops.
    *
    ******************************************************************************/
   
   ACPI_PARSE_OBJECT *
   TrLinkPeerOps (
       UINT32                  NumPeers,
       ...)
   {
       ACPI_PARSE_OBJECT       *This;
       ACPI_PARSE_OBJECT       *Next;
       va_list                 ap;
       UINT32                  i;
       ACPI_PARSE_OBJECT       *Start;
   
   
       DbgPrint (ASL_PARSE_OUTPUT,
           "\nLinkPeerOps: (%u) ", NumPeers);
   
       va_start (ap, NumPeers);
       This = va_arg (ap, ACPI_PARSE_OBJECT *);
       Start = This;
   
       /*
        * Link all peers
        */
       for (i = 0; i < (NumPeers -1); i++)
       {
           DbgPrint (ASL_PARSE_OUTPUT, "%u=%p ", (i+1), This);
   
           while (This->Asl.Next)
           {
               This = This->Asl.Next;
           }
   
           /* Get another peer op */
   
           Next = va_arg (ap, ACPI_PARSE_OBJECT *);
           if (!Next)
           {
               Next = TrAllocateOp (PARSEOP_DEFAULT_ARG);
           }
   
           /* link new op to the current op */
   
           This->Asl.Next = Next;
           This = Next;
       }
   
       va_end (ap);
       DbgPrint (ASL_PARSE_OUTPUT,"\n");
       return (Start);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrLinkChildOp
    *
    * PARAMETERS:  Op1           - Parent op
    *              Op2           - Op to become a child
    *
    * RETURN:      The parent op
    *
    * DESCRIPTION: Link two ops together as a parent and child
    *
    ******************************************************************************/
   
   ACPI_PARSE_OBJECT *
   TrLinkChildOp (
       ACPI_PARSE_OBJECT       *Op1,
       ACPI_PARSE_OBJECT       *Op2)
   {
       ACPI_PARSE_OBJECT       *Next;
   
   
       DbgPrint (ASL_PARSE_OUTPUT,
           "\nLinkChildOp: Parent=%p (%s), Child=%p (%s)\n",
           Op1, Op1 ? UtGetOpName(Op1->Asl.ParseOpcode): NULL,
           Op2, Op2 ? UtGetOpName(Op2->Asl.ParseOpcode): NULL);
   
       /*
        * Converter: if TrLinkChildOp is called to link a method call,
        * turn on capture comments as it signifies that we are done parsing
        * a method call.
        */
       if (AcpiGbl_CaptureComments && Op1)
       {
           if (Op1->Asl.ParseOpcode == PARSEOP_METHODCALL)
           {
               AslGbl_CommentState.CaptureComments = TRUE;
           }
           AslGbl_CommentState.LatestParseOp = Op1;
       }
   
       if (!Op1 || !Op2)
       {
           return (Op1);
       }
   
       Op1->Asl.Child = Op2;
   
       /* Set the child and all peers of the child to point to the parent */
   
       Next = Op2;
       while (Next)
       {
           Next->Asl.Parent = Op1;
           Next = Next->Asl.Next;
       }
   
       return (Op1);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    TrWalkParseTree
    *
    * PARAMETERS:  Op                      - Walk starting point
    *              Visitation              - Type of walk
    *              DescendingCallback      - Called during tree descent
    *              AscendingCallback       - Called during tree ascent
    *              Context                 - To be passed to the callbacks
    *
    * RETURN:      Status from callback(s)
    *
    * DESCRIPTION: Walk the entire parse tree.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   TrWalkParseTree (
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  Visitation,
       ASL_WALK_CALLBACK       DescendingCallback,
       ASL_WALK_CALLBACK       AscendingCallback,
       void                    *Context)
   {
       UINT32                  Level;
       BOOLEAN                 OpPreviouslyVisited;
       ACPI_PARSE_OBJECT       *StartOp = Op;
       ACPI_STATUS             Status;
       ACPI_PARSE_OBJECT       *Restore = NULL;
       BOOLEAN                 WalkOneDefinitionBlock = Visitation & ASL_WALK_VISIT_DB_SEPARATELY;
   
   
       if (!AslGbl_ParseTreeRoot)
       {
           return (AE_OK);
       }
   
       Level = 0;
       OpPreviouslyVisited = FALSE;
   
       if (Op->Asl.ParseOpcode == PARSEOP_DEFINITION_BLOCK &&
           WalkOneDefinitionBlock)
       {
           Restore = Op->Asl.Next;
           Op->Asl.Next = NULL;
       }
       switch (Visitation & ~ASL_WALK_VISIT_DB_SEPARATELY)
       {
       case ASL_WALK_VISIT_DOWNWARD:
   
           while (Op)
           {
               if (!OpPreviouslyVisited)
               {
                   /* Let the callback process the op. */
   
                   Status = DescendingCallback (Op, Level, Context);
                   if (ACPI_SUCCESS (Status))
                   {
                       /* Visit children first, once */
   
                       if (Op->Asl.Child)
                       {
                           Level++;
                           Op = Op->Asl.Child;
                           continue;
                       }
                   }
                   else if (Status != AE_CTRL_DEPTH)
                   {
                       /* Exit immediately on any error */
   
                       goto ErrorExit;
                   }
               }
   
               /* Terminate walk at start op */
   
               if (Op == StartOp)
               {
                   break;
               }
   
               /* No more children, visit peers */
   
               if (Op->Asl.Next)
               {
                   Op = Op->Asl.Next;
                   OpPreviouslyVisited = FALSE;
               }
               else
               {
                   /* No children or peers, re-visit parent */
   
                   if (Level != 0 )
                   {
                       Level--;
                   }
                   Op = Op->Asl.Parent;
                   OpPreviouslyVisited = TRUE;
               }
           }
           break;
   
       case ASL_WALK_VISIT_UPWARD:
   
           while (Op)
           {
               /* Visit leaf op (no children) or parent op on return trip */
   
               if ((!Op->Asl.Child) ||
                   (OpPreviouslyVisited))
               {
                   /* Let the callback process the op. */
   
                   Status = AscendingCallback (Op, Level, Context);
                   if (ACPI_FAILURE (Status))
                   {
                       goto ErrorExit;
                   }
               }
               else
               {
                   /* Visit children first, once */
   
                   Level++;
                   Op = Op->Asl.Child;
                   continue;
               }
   
               /* Terminate walk at start op */
   
               if (Op == StartOp)
               {
                   break;
               }
   
               /* No more children, visit peers */
   
               if (Op->Asl.Next)
               {
                   Op = Op->Asl.Next;
                   OpPreviouslyVisited = FALSE;
               }
               else
               {
                   /* No children or peers, re-visit parent */
   
                   if (Level != 0 )
                   {
                       Level--;
                   }
                   Op = Op->Asl.Parent;
                   OpPreviouslyVisited = TRUE;
               }
           }
           break;
   
        case ASL_WALK_VISIT_TWICE:
   
           while (Op)
           {
               if (OpPreviouslyVisited)
               {
                   Status = AscendingCallback (Op, Level, Context);
                   if (ACPI_FAILURE (Status))
                   {
                       goto ErrorExit;
                   }
              }
              else
              {
                  /* Let the callback process the op. */
  
                  Status = DescendingCallback (Op, Level, Context);
                  if (ACPI_SUCCESS (Status))
                  {
                      /* Visit children first, once */
  
                      if (Op->Asl.Child)
                      {
                          Level++;
                          Op = Op->Asl.Child;
                          continue;
                      }
                  }
                  else if (Status != AE_CTRL_DEPTH)
                  {
                      /* Exit immediately on any error */
  
                      goto ErrorExit;
                  }
              }
  
              /* Terminate walk at start op */
  
              if (Op == StartOp)
              {
                  break;
              }
  
              /* No more children, visit peers */
  
              if (Op->Asl.Next)
              {
                  Op = Op->Asl.Next;
                  OpPreviouslyVisited = FALSE;
              }
              else
              {
                  /* No children or peers, re-visit parent */
  
                  if (Level != 0 )
                  {
                      Level--;
                  }
                  Op = Op->Asl.Parent;
                  OpPreviouslyVisited = TRUE;
              }
          }
          break;
  
      default:
          /* No other types supported */
          break;
      }
  
      /* If we get here, the walk completed with no errors */
  
      if (Op->Asl.ParseOpcode == PARSEOP_DEFINITION_BLOCK &&
          WalkOneDefinitionBlock)
      {
          Op->Asl.Next = Restore;
      }
  
      return (AE_OK);
  
  ErrorExit:
  
      if (Op->Asl.ParseOpcode == PARSEOP_DEFINITION_BLOCK &&
          WalkOneDefinitionBlock)
      {
          Op->Asl.Next = Restore;
      }
      return (Status);
  }

Cache object: e93e6c0985c4d076533d04d5cbffc28b