/******************************************************************************
 *
 * Module Name: dswscope - Scope stack manipulation
 *              $Revision: 42 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999, 2000, 2001, 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.
 *
 *****************************************************************************/

#define __DSWSCOPE_C__

#include "acpi.h"
#include "acinterp.h"
#include "acdispat.h"


#define _COMPONENT          NAMESPACE
        MODULE_NAME         ("dswscope")


#define STACK_POP(head) head


/****************************************************************************
 *
 * FUNCTION:    AcpiDsScopeStackClear
 *
 * PARAMETERS:  None
 *
 * DESCRIPTION: Pop (and free) everything on the scope stack except the
 *              root scope object (which remains at the stack top.)
 *
 ***************************************************************************/

void
AcpiDsScopeStackClear (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_GENERIC_STATE      *ScopeInfo;


    while (WalkState->ScopeInfo)
    {
        /* Pop a scope off the stack */

        ScopeInfo = WalkState->ScopeInfo;
        WalkState->ScopeInfo = ScopeInfo->Scope.Next;

        DEBUG_PRINT (TRACE_EXEC,
            ("Popped object type %X\n", ScopeInfo->Common.Value));
        AcpiCmDeleteGenericState (ScopeInfo);
    }
}


/****************************************************************************
 *
 * FUNCTION:    AcpiDsScopeStackPush
 *
 * PARAMETERS:  *Node,              - Name to be made current
 *              Type,               - Type of frame being pushed
 *
 * DESCRIPTION: Push the current scope on the scope stack, and make the
 *              passed Node current.
 *
 ***************************************************************************/

ACPI_STATUS
AcpiDsScopeStackPush (
    ACPI_NAMESPACE_NODE     *Node,
    OBJECT_TYPE_INTERNAL    Type,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_GENERIC_STATE      *ScopeInfo;


    FUNCTION_TRACE ("DsScopeStackPush");


    if (!Node)
    {
        /*  invalid scope   */

        REPORT_ERROR (("DsScopeStackPush: null scope passed\n"));
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Make sure object type is valid */

    if (!AcpiAmlValidateObjectType (Type))
    {
        REPORT_WARNING (("DsScopeStackPush: type code out of range\n"));
    }


    /* Allocate a new scope object */

    ScopeInfo = AcpiCmCreateGenericState ();
    if (!ScopeInfo)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /* Init new scope object */

    ScopeInfo->Scope.Node  = Node;
    ScopeInfo->Common.Value = (UINT16) Type;

    /* Push new scope object onto stack */

    AcpiCmPushGenericState (&WalkState->ScopeInfo, ScopeInfo);

    return_ACPI_STATUS (AE_OK);
}


/****************************************************************************
 *
 * FUNCTION:    AcpiDsScopeStackPop
 *
 * PARAMETERS:  Type                - The type of frame to be found
 *
 * DESCRIPTION: Pop the scope stack until a frame of the requested type
 *              is found.
 *
 * RETURN:      Count of frames popped.  If no frame of the requested type
 *              was found, the count is returned as a negative number and
 *              the scope stack is emptied (which sets the current scope
 *              to the root).  If the scope stack was empty at entry, the
 *              function is a no-op and returns 0.
 *
 ***************************************************************************/

ACPI_STATUS
AcpiDsScopeStackPop (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_GENERIC_STATE      *ScopeInfo;


    FUNCTION_TRACE ("DsScopeStackPop");

    /*
     * Pop scope info object off the stack.
     */

    ScopeInfo = AcpiCmPopGenericState (&WalkState->ScopeInfo);
    if (!ScopeInfo)
    {
        return_ACPI_STATUS (AE_STACK_UNDERFLOW);
    }

    DEBUG_PRINT (TRACE_EXEC,
        ("Popped object type %X\n", ScopeInfo->Common.Value));

    AcpiCmDeleteGenericState (ScopeInfo);

    return_ACPI_STATUS (AE_OK);
}