/******************************************************************************
 *
 * Module Name: dswscope - Scope stack manipulation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2011, Intel Corp.
 * All rights reserved.
 *
 * 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.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * 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 MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 */

#define __DSWSCOPE_C__

#include "acpi.h"
#include "accommon.h"
#include "acdispat.h"


#define _COMPONENT          ACPI_DISPATCHER
        ACPI_MODULE_NAME    ("dswscope")


/****************************************************************************
 *
 * FUNCTION:    AcpiDsScopeStackClear
 *
 * PARAMETERS:  WalkState       - Current state
 *
 * RETURN:      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;

    ACPI_FUNCTION_NAME (DsScopeStackClear);


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

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

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
            "Popped object type (%s)\n",
            AcpiUtGetTypeName (ScopeInfo->Common.Value)));
        AcpiUtDeleteGenericState (ScopeInfo);
    }
}


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

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


    ACPI_FUNCTION_TRACE (DsScopeStackPush);


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

        ACPI_ERROR ((AE_INFO, "Null scope parameter"));
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Make sure object type is valid */

    if (!AcpiUtValidObjectType (Type))
    {
        ACPI_WARNING ((AE_INFO,
            "Invalid object type: 0x%X", Type));
    }

    /* Allocate a new scope object */

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

    /* Init new scope object */

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

    WalkState->ScopeDepth++;

    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
        "[%.2d] Pushed scope ", (UINT32) WalkState->ScopeDepth));

    OldScopeInfo = WalkState->ScopeInfo;
    if (OldScopeInfo)
    {
        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
            "[%4.4s] (%s)",
            AcpiUtGetNodeName (OldScopeInfo->Scope.Node),
            AcpiUtGetTypeName (OldScopeInfo->Common.Value)));
    }
    else
    {
        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
            "[\\___] (%s)", "ROOT"));
    }

    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
        ", New scope -> [%4.4s] (%s)\n",
        AcpiUtGetNodeName (ScopeInfo->Scope.Node),
        AcpiUtGetTypeName (ScopeInfo->Common.Value)));

    /* Push new scope object onto stack */

    AcpiUtPushGenericState (&WalkState->ScopeInfo, ScopeInfo);
    return_ACPI_STATUS (AE_OK);
}


/****************************************************************************
 *
 * FUNCTION:    AcpiDsScopeStackPop
 *
 * PARAMETERS:  WalkState       - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop the scope stack once.
 *
 ***************************************************************************/

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


    ACPI_FUNCTION_TRACE (DsScopeStackPop);


    /*
     * Pop scope info object off the stack.
     */
    ScopeInfo = AcpiUtPopGenericState (&WalkState->ScopeInfo);
    if (!ScopeInfo)
    {
        return_ACPI_STATUS (AE_STACK_UNDERFLOW);
    }

    WalkState->ScopeDepth--;

    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
        "[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
        (UINT32) WalkState->ScopeDepth,
        AcpiUtGetNodeName (ScopeInfo->Scope.Node),
        AcpiUtGetTypeName (ScopeInfo->Common.Value)));

    NewScopeInfo = WalkState->ScopeInfo;
    if (NewScopeInfo)
    {
        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
            "[%4.4s] (%s)\n",
            AcpiUtGetNodeName (NewScopeInfo->Scope.Node),
            AcpiUtGetTypeName (NewScopeInfo->Common.Value)));
    }
    else
    {
        ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
            "[\\___] (ROOT)\n"));
    }

    AcpiUtDeleteGenericState (ScopeInfo);
    return_ACPI_STATUS (AE_OK);
}