1 /******************************************************************************
3 * Module Name: asllookup- Namespace lookup functions
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2013, Intel Corp.
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45 #include "aslcompiler.h"
46 #include "aslcompiler.y.h"
53 #define _COMPONENT ACPI_COMPILER
54 ACPI_MODULE_NAME ("asllookup")
56 /* Local prototypes */
60 ACPI_HANDLE ObjHandle,
65 static ACPI_PARSE_OBJECT *
67 ACPI_PARSE_OBJECT *Op);
70 /*******************************************************************************
72 * FUNCTION: LkFindUnreferencedObjects
78 * DESCRIPTION: Namespace walk to find objects that are not referenced in any
79 * way. Must be called after the namespace has been cross
82 ******************************************************************************/
85 LkFindUnreferencedObjects (
89 /* Walk entire namespace from the supplied root */
91 (void) AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
92 ACPI_UINT32_MAX, FALSE, LkIsObjectUsed, NULL,
97 /*******************************************************************************
99 * FUNCTION: LkIsObjectUsed
101 * PARAMETERS: ACPI_WALK_CALLBACK
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. Note: Names that are declared within a
109 * control method are temporary, so we always issue a remark
110 * if they are not referenced.
112 ******************************************************************************/
116 ACPI_HANDLE ObjHandle,
121 ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
122 ACPI_NAMESPACE_NODE *Next;
125 /* Referenced flag is set during the namespace xref */
127 if (Node->Flags & ANOBJ_IS_REFERENCED)
137 /* These types are typically never directly referenced, ignore them */
141 case ACPI_TYPE_DEVICE:
142 case ACPI_TYPE_PROCESSOR:
143 case ACPI_TYPE_POWER:
144 case ACPI_TYPE_THERMAL:
145 case ACPI_TYPE_LOCAL_RESOURCE:
154 /* Determine if the name is within a control method */
159 if (Next->Type == ACPI_TYPE_METHOD)
162 * Name is within a method, therefore it is temporary.
163 * Issue a remark even if it is a reserved name (starts
164 * with an underscore).
166 sprintf (MsgBuffer, "Name is within method [%4.4s]",
168 AslError (ASL_REMARK, ASL_MSG_NOT_REFERENCED,
169 LkGetNameOp (Node->Op), MsgBuffer);
176 /* The name is not within a control method */
179 * Ignore names that start with an underscore. These are the reserved
180 * ACPI names and are typically not referenced since they are meant
181 * to be called by the host OS.
183 if (Node->Name.Ascii[0] == '_')
189 * What remains is an unresolved user name that is not within a method.
190 * However, the object could be referenced via another table, so issue
191 * the warning at level 2.
193 AslError (ASL_WARNING2, ASL_MSG_NOT_REFERENCED,
194 LkGetNameOp (Node->Op), NULL);
199 /*******************************************************************************
201 * FUNCTION: LkGetNameOp
203 * PARAMETERS: Op - Current Op
205 * RETURN: NameOp associated with the input op
207 * DESCRIPTION: Find the name declaration op associated with the operator
209 ******************************************************************************/
211 static ACPI_PARSE_OBJECT *
213 ACPI_PARSE_OBJECT *Op)
215 const ACPI_OPCODE_INFO *OpInfo;
216 ACPI_PARSE_OBJECT *NameOp = Op;
219 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
222 /* Get the NamePath from the appropriate place */
224 if (OpInfo->Flags & AML_NAMED)
226 /* For nearly all NAMED operators, the name reference is the first child */
228 NameOp = Op->Asl.Child;
229 if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
232 * ALIAS is the only oddball opcode, the name declaration
233 * (alias name) is the second operand
235 NameOp = Op->Asl.Child->Asl.Next;
238 else if (OpInfo->Flags & AML_CREATE)
240 /* Name must appear as the last parameter */
242 NameOp = Op->Asl.Child;
243 while (!(NameOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
245 NameOp = NameOp->Asl.Next;