pswalk.c revision 30082d0cc16bf5799269ca464a219de900f519cd
2N/A/******************************************************************************
2N/A *
2N/A * Module Name: pswalk - Parser routines to walk parsed op tree(s)
2N/A * $Revision: 1.76 $
2N/A *
2N/A *****************************************************************************/
2N/A
2N/A/******************************************************************************
2N/A *
2N/A * 1. Copyright Notice
2N/A *
2N/A * Some or all of this work - Copyright (c) 1999 - 2006, Intel Corp.
2N/A * All rights reserved.
2N/A *
2N/A * 2. License
2N/A *
2N/A * 2.1. This is your license from Intel Corp. under its intellectual property
2N/A * rights. You may have additional license terms from the party that provided
2N/A * you this software, covering your right to use that party's intellectual
2N/A * property rights.
2N/A *
2N/A * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
2N/A * copy of the source code appearing in this file ("Covered Code") an
2N/A * irrevocable, perpetual, worldwide license under Intel's copyrights in the
2N/A * base code distributed originally by Intel ("Original Intel Code") to copy,
2N/A * make derivatives, distribute, use and display any portion of the Covered
2N/A * Code in any form, with the right to sublicense such rights; and
2N/A *
2N/A * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
2N/A * license (with the right to sublicense), under only those claims of Intel
2N/A * patents that are infringed by the Original Intel Code, to make, use, sell,
2N/A * offer to sell, and import the Covered Code and derivative works thereof
2N/A * solely to the minimum extent necessary to exercise the above copyright
2N/A * license, and in no event shall the patent license extend to any additions
2N/A * to or modifications of the Original Intel Code. No other license or right
2N/A * is granted directly or by implication, estoppel or otherwise;
2N/A *
2N/A * The above copyright and patent license is granted only if the following
2N/A * conditions are met:
2N/A *
2N/A * 3. Conditions
2N/A *
2N/A * 3.1. Redistribution of Source with Rights to Further Distribute Source.
2N/A * Redistribution of source code of any substantial portion of the Covered
2N/A * Code or modification with rights to further distribute source must include
2N/A * the above Copyright Notice, the above License, this list of Conditions,
2N/A * and the following Disclaimer and Export Compliance provision. In addition,
2N/A * 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.
*
*****************************************************************************/
#include "acpi.h"
#include "acparser.h"
#define _COMPONENT ACPI_PARSER
ACPI_MODULE_NAME ("pswalk")
/*******************************************************************************
*
* FUNCTION: AcpiPsDeleteParseTree
*
* PARAMETERS: SubtreeRoot - Root of tree (or subtree) to delete
*
* RETURN: None
*
* DESCRIPTION: Delete a portion of or an entire parse tree.
*
******************************************************************************/
void
AcpiPsDeleteParseTree (
ACPI_PARSE_OBJECT *SubtreeRoot)
{
ACPI_PARSE_OBJECT *Op = SubtreeRoot;
ACPI_PARSE_OBJECT *Next = NULL;
ACPI_PARSE_OBJECT *Parent = NULL;
ACPI_FUNCTION_TRACE_PTR ("PsDeleteParseTree", SubtreeRoot);
/* Visit all nodes in the subtree */
while (Op)
{
/* Check if we are not ascending */
if (Op != Parent)
{
/* Look for an argument or child of the current op */
Next = AcpiPsGetArg (Op, 0);
if (Next)
{
/* Still going downward in tree (Op is not completed yet) */
Op = Next;
continue;
}
}
/* No more children, this Op is complete. */
Next = Op->Common.Next;
Parent = Op->Common.Parent;
AcpiPsFreeOp (Op);
/* If we are back to the starting point, the walk is complete. */
if (Op == SubtreeRoot)
{
return_VOID;
}
if (Next)
{
Op = Next;
}
else
{
Op = Parent;
}
}
return_VOID;
}