asllookup.c revision 199767f8919635c4928607450d9e0abb932109ce
/******************************************************************************
*
* Module Name: asllookup- Namespace lookup functions
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2015, 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.
*/
#include "aslcompiler.y.h"
#define _COMPONENT ACPI_COMPILER
ACPI_MODULE_NAME ("asllookup")
/* Local prototypes */
static ACPI_STATUS
void *Context,
void **ReturnValue);
static ACPI_PARSE_OBJECT *
/*******************************************************************************
*
* FUNCTION: LkFindUnreferencedObjects
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Namespace walk to find objects that are not referenced in any
* way. Must be called after the namespace has been cross
* referenced.
*
******************************************************************************/
void
void)
{
/* Walk entire namespace from the supplied root */
}
/*******************************************************************************
*
* FUNCTION: LkIsObjectUsed
*
* PARAMETERS: ACPI_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Check for an unreferenced namespace object and emit a warning.
* We have to be careful, because some types and names are
* typically or always unreferenced, we don't want to issue
* excessive warnings. Note: Names that are declared within a
* control method are temporary, so we always issue a remark
* if they are not referenced.
*
******************************************************************************/
static ACPI_STATUS
void *Context,
void **ReturnValue)
{
UINT32 i;
{
{
return (AE_OK);
}
/*
* Analysis of LocalX variables
*/
for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++)
{
/* Warn for Locals that are set but never referenced */
{
}
}
/*
* Analysis of ArgX variables (standard method arguments,
* and remaining unused ArgX can also be used as locals)
*/
for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++)
{
{
/* Warn if ArgX is being used as a local, but not referenced */
{
}
}
else
{
/*
* Remark if a normal method ArgX is not referenced.
* We ignore the predefined methods since often, not
* all arguments are needed or used.
*/
{
}
}
}
}
/* Referenced flag is set during the namespace xref */
{
return (AE_OK);
}
{
return (AE_OK);
}
/* These types are typically never directly referenced, ignore them */
{
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_POWER:
case ACPI_TYPE_THERMAL:
case ACPI_TYPE_LOCAL_RESOURCE:
return (AE_OK);
default:
break;
}
/* Determine if the name is within a control method */
while (Next)
{
{
/*
* Name is within a method, therefore it is temporary.
* Issue a remark even if it is a reserved name (starts
* with an underscore).
*/
return (AE_OK);
}
}
/* The name is not within a control method */
/*
* Ignore names that start with an underscore. These are the reserved
* ACPI names and are typically not referenced since they are meant
* to be called by the host OS.
*/
{
return (AE_OK);
}
/*
* What remains is an unresolved user name that is not within a method.
* However, the object could be referenced via another table, so issue
* the warning at level 2.
*/
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: LkGetNameOp
*
* PARAMETERS: Op - Current Op
*
* RETURN: NameOp associated with the input op
*
* DESCRIPTION: Find the name declaration op associated with the operator
*
******************************************************************************/
static ACPI_PARSE_OBJECT *
{
const ACPI_OPCODE_INFO *OpInfo;
/* Get the NamePath from the appropriate place */
{
/* For nearly all NAMED operators, the name reference is the first child */
{
/*
* ALIAS is the only oddball opcode, the name declaration
* (alias name) is the second operand
*/
}
}
{
/* Name must appear as the last parameter */
{
}
}
return (NameOp);
}