315 lines
9.6 KiB
C
315 lines
9.6 KiB
C
/******************************************************************************
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*
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* Module Name: asllookup- Namespace lookup functions
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2015, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <contrib/dev/acpica/compiler/aslcompiler.h>
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#include "aslcompiler.y.h"
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#include <contrib/dev/acpica/include/acparser.h>
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#include <contrib/dev/acpica/include/amlcode.h>
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#include <contrib/dev/acpica/include/acnamesp.h>
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#include <contrib/dev/acpica/include/acdispat.h>
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME ("asllookup")
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/* Local prototypes */
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static ACPI_STATUS
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LkIsObjectUsed (
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ACPI_HANDLE ObjHandle,
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UINT32 Level,
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void *Context,
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void **ReturnValue);
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static ACPI_PARSE_OBJECT *
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LkGetNameOp (
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ACPI_PARSE_OBJECT *Op);
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/*******************************************************************************
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*
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* FUNCTION: LkFindUnreferencedObjects
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Namespace walk to find objects that are not referenced in any
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* way. Must be called after the namespace has been cross
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* referenced.
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*
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******************************************************************************/
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void
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LkFindUnreferencedObjects (
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void)
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{
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/* Walk entire namespace from the supplied root */
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(void) AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, FALSE, LkIsObjectUsed, NULL,
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NULL, NULL);
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}
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/*******************************************************************************
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*
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* FUNCTION: LkIsObjectUsed
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*
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* PARAMETERS: ACPI_WALK_CALLBACK
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*
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* RETURN: Status
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*
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* DESCRIPTION: Check for an unreferenced namespace object and emit a warning.
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* We have to be careful, because some types and names are
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* typically or always unreferenced, we don't want to issue
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* excessive warnings. Note: Names that are declared within a
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* control method are temporary, so we always issue a remark
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* if they are not referenced.
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*
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******************************************************************************/
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static ACPI_STATUS
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LkIsObjectUsed (
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ACPI_HANDLE ObjHandle,
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UINT32 Level,
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void *Context,
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void **ReturnValue)
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{
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ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
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ACPI_NAMESPACE_NODE *Next;
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ASL_METHOD_LOCAL *MethodLocals;
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ASL_METHOD_LOCAL *MethodArgs;
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UINT32 i;
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if (Node->Type == ACPI_TYPE_METHOD)
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{
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if (!Node->Op || !Node->MethodLocals)
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{
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return (AE_OK);
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}
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MethodLocals = (ASL_METHOD_LOCAL *) Node->MethodLocals;
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MethodArgs = (ASL_METHOD_LOCAL *) Node->MethodArgs;
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/*
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* Analysis of LocalX variables
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*/
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for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++)
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{
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/* Warn for Locals that are set but never referenced */
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if ((MethodLocals[i].Flags & ASL_LOCAL_INITIALIZED) &&
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(!(MethodLocals[i].Flags & ASL_LOCAL_REFERENCED)))
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{
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sprintf (MsgBuffer, "Local%u", i);
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AslError (ASL_WARNING, ASL_MSG_LOCAL_NOT_USED,
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MethodLocals[i].Op, MsgBuffer);
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}
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}
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/*
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* Analysis of ArgX variables (standard method arguments,
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* and remaining unused ArgX can also be used as locals)
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*/
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for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++)
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{
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if (MethodArgs[i].Flags & ASL_ARG_IS_LOCAL)
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{
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/* Warn if ArgX is being used as a local, but not referenced */
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if ((MethodArgs[i].Flags & ASL_ARG_INITIALIZED) &&
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(!(MethodArgs[i].Flags & ASL_ARG_REFERENCED)))
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{
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sprintf (MsgBuffer, "Arg%u", i);
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AslError (ASL_WARNING, ASL_MSG_ARG_AS_LOCAL_NOT_USED,
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MethodArgs[i].Op, MsgBuffer);
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}
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}
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else
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{
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/*
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* Remark if a normal method ArgX is not referenced.
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* We ignore the predefined methods since often, not
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* all arguments are needed or used.
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*/
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if ((Node->Name.Ascii[0] != '_') &&
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(!(MethodArgs[i].Flags & ASL_ARG_REFERENCED)))
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{
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sprintf (MsgBuffer, "Arg%u", i);
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AslError (ASL_REMARK, ASL_MSG_ARG_NOT_USED,
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MethodArgs[i].Op, MsgBuffer);
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}
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}
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}
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}
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/* Referenced flag is set during the namespace xref */
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if (Node->Flags & ANOBJ_IS_REFERENCED)
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{
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return (AE_OK);
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}
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if (!Node->Op)
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{
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return (AE_OK);
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}
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/* These types are typically never directly referenced, ignore them */
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switch (Node->Type)
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{
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case ACPI_TYPE_DEVICE:
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case ACPI_TYPE_PROCESSOR:
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case ACPI_TYPE_POWER:
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case ACPI_TYPE_THERMAL:
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case ACPI_TYPE_LOCAL_RESOURCE:
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return (AE_OK);
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default:
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break;
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}
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/* Determine if the name is within a control method */
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Next = Node->Parent;
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while (Next)
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{
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if (Next->Type == ACPI_TYPE_METHOD)
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{
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/*
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* Name is within a method, therefore it is temporary.
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* Issue a remark even if it is a reserved name (starts
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* with an underscore).
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*/
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sprintf (MsgBuffer, "Name is within method [%4.4s]",
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Next->Name.Ascii);
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AslError (ASL_REMARK, ASL_MSG_NOT_REFERENCED,
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LkGetNameOp (Node->Op), MsgBuffer);
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return (AE_OK);
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}
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Next = Next->Parent;
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}
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/* The name is not within a control method */
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/*
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* Ignore names that start with an underscore. These are the reserved
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* ACPI names and are typically not referenced since they are meant
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* to be called by the host OS.
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*/
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if (Node->Name.Ascii[0] == '_')
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{
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return (AE_OK);
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}
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/*
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* What remains is an unresolved user name that is not within a method.
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* However, the object could be referenced via another table, so issue
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* the warning at level 2.
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*/
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AslError (ASL_WARNING2, ASL_MSG_NOT_REFERENCED,
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LkGetNameOp (Node->Op), NULL);
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: LkGetNameOp
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*
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* PARAMETERS: Op - Current Op
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*
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* RETURN: NameOp associated with the input op
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*
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* DESCRIPTION: Find the name declaration op associated with the operator
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*
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******************************************************************************/
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static ACPI_PARSE_OBJECT *
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LkGetNameOp (
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ACPI_PARSE_OBJECT *Op)
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{
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const ACPI_OPCODE_INFO *OpInfo;
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ACPI_PARSE_OBJECT *NameOp = Op;
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OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
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/* Get the NamePath from the appropriate place */
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if (OpInfo->Flags & AML_NAMED)
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{
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/* For nearly all NAMED operators, the name reference is the first child */
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NameOp = Op->Asl.Child;
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if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
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{
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/*
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* ALIAS is the only oddball opcode, the name declaration
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* (alias name) is the second operand
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*/
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NameOp = Op->Asl.Child->Asl.Next;
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}
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}
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else if (OpInfo->Flags & AML_CREATE)
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{
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/* Name must appear as the last parameter */
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NameOp = Op->Asl.Child;
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while (!(NameOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
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{
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NameOp = NameOp->Asl.Next;
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}
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}
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return (NameOp);
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}
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