arch/all-pc/acpica/source/compiler/asllookup.c

   1 /******************************************************************************
   2  *
   3  * Module Name: asllookup- Namespace lookup functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44
  45 #include "aslcompiler.h"
  46 #include "aslcompiler.y.h"
  47 #include "acparser.h"
  48 #include "amlcode.h"
  49 #include "acnamesp.h"
  50 #include "acdispat.h"
  51
  52
  53 #define _COMPONENT          ACPI_COMPILER
  54         ACPI_MODULE_NAME    ("asllookup")
  55
  56 /* Local prototypes */
  57
  58 static ACPI_STATUS
  59 LkIsObjectUsed (
  60     ACPI_HANDLE             ObjHandle,
  61     UINT32                  Level,
  62     void                    *Context,
  63     void                    **ReturnValue);
  64
  65 static ACPI_PARSE_OBJECT *
  66 LkGetNameOp (
  67     ACPI_PARSE_OBJECT       *Op);
  68
  69
  70 /*******************************************************************************
  71  *
  72  * FUNCTION:    LkFindUnreferencedObjects
  73  *
  74  * PARAMETERS:  None
  75  *
  76  * RETURN:      None
  77  *
  78  * DESCRIPTION: Namespace walk to find objects that are not referenced in any
  79  *              way. Must be called after the namespace has been cross
  80  *              referenced.
  81  *
  82  ******************************************************************************/
  83
  84 void
  85 LkFindUnreferencedObjects (
  86     void)
  87 {
  88
  89     /* Walk entire namespace from the supplied root */
  90
  91     (void) AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
  92                 ACPI_UINT32_MAX, FALSE, LkIsObjectUsed, NULL,
  93                 NULL, NULL);
  94 }
  95
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    LkIsObjectUsed
 100  *
 101  * PARAMETERS:  ACPI_WALK_CALLBACK
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Check for an unreferenced namespace object and emit a warning.
 106  *              We have to be careful, because some types and names are
 107  *              typically or always unreferenced, we don't want to issue
 108  *              excessive warnings.
 109  *
 110  ******************************************************************************/
 111
 112 static ACPI_STATUS
 113 LkIsObjectUsed (
 114     ACPI_HANDLE             ObjHandle,
 115     UINT32                  Level,
 116     void                    *Context,
 117     void                    **ReturnValue)
 118 {
 119     ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
 120
 121
 122     /* Referenced flag is set during the namespace xref */
 123
 124     if (Node->Flags & ANOBJ_IS_REFERENCED)
 125     {
 126         return (AE_OK);
 127     }
 128
 129     /*
 130      * Ignore names that start with an underscore,
 131      * these are the reserved ACPI names and are typically not referenced,
 132      * they are called by the host OS.
 133      */
 134     if (Node->Name.Ascii[0] == '_')
 135     {
 136         return (AE_OK);
 137     }
 138
 139     /* There are some types that are typically not referenced, ignore them */
 140
 141     switch (Node->Type)
 142     {
 143     case ACPI_TYPE_DEVICE:
 144     case ACPI_TYPE_PROCESSOR:
 145     case ACPI_TYPE_POWER:
 146     case ACPI_TYPE_LOCAL_RESOURCE:
 147
 148         return (AE_OK);
 149
 150     default:
 151
 152         break;
 153     }
 154
 155     /* All others are valid unreferenced namespace objects */
 156
 157     if (Node->Op)
 158     {
 159         AslError (ASL_WARNING2, ASL_MSG_NOT_REFERENCED, LkGetNameOp (Node->Op), NULL);
 160     }
 161     return (AE_OK);
 162 }
 163
 164
 165 /*******************************************************************************
 166  *
 167  * FUNCTION:    LkGetNameOp
 168  *
 169  * PARAMETERS:  Op              - Current Op
 170  *
 171  * RETURN:      NameOp associated with the input op
 172  *
 173  * DESCRIPTION: Find the name declaration op associated with the operator
 174  *
 175  ******************************************************************************/
 176
 177 static ACPI_PARSE_OBJECT *
 178 LkGetNameOp (
 179     ACPI_PARSE_OBJECT       *Op)
 180 {
 181     const ACPI_OPCODE_INFO  *OpInfo;
 182     ACPI_PARSE_OBJECT       *NameOp = Op;
 183
 184
 185     OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
 186
 187
 188     /* Get the NamePath from the appropriate place */
 189
 190     if (OpInfo->Flags & AML_NAMED)
 191     {
 192         /* For nearly all NAMED operators, the name reference is the first child */
 193
 194         NameOp = Op->Asl.Child;
 195         if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
 196         {
 197             /*
 198              * ALIAS is the only oddball opcode, the name declaration
 199              * (alias name) is the second operand
 200              */
 201             NameOp = Op->Asl.Child->Asl.Next;
 202         }
 203     }
 204     else if (OpInfo->Flags & AML_CREATE)
 205     {
 206         /* Name must appear as the last parameter */
 207
 208         NameOp = Op->Asl.Child;
 209         while (!(NameOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
 210         {
 211             NameOp = NameOp->Asl.Next;
 212         }
 213     }
 214
 215     return (NameOp);
 216 }