1 /******************************************************************************
3 * Module Name: asllookup- Namespace lookup functions
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2015, Intel Corp.
12 * All rights reserved.
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
37 * The above copyright and patent license is granted only if the following
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
72 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
80 * 4. Disclaimer and Export Compliance
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
114 *****************************************************************************/
116 #include "aslcompiler.h"
117 #include "aslcompiler.y.h"
118 #include "acparser.h"
120 #include "acnamesp.h"
121 #include "acdispat.h"
124 #define _COMPONENT ACPI_COMPILER
125 ACPI_MODULE_NAME ("asllookup")
127 /* Local prototypes */
131 ACPI_HANDLE ObjHandle,
136 static ACPI_PARSE_OBJECT *
138 ACPI_PARSE_OBJECT *Op);
141 /*******************************************************************************
143 * FUNCTION: LkFindUnreferencedObjects
149 * DESCRIPTION: Namespace walk to find objects that are not referenced in any
150 * way. Must be called after the namespace has been cross
153 ******************************************************************************/
156 LkFindUnreferencedObjects (
160 /* Walk entire namespace from the supplied root */
162 (void) AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
163 ACPI_UINT32_MAX, FALSE, LkIsObjectUsed, NULL,
168 /*******************************************************************************
170 * FUNCTION: LkIsObjectUsed
172 * PARAMETERS: ACPI_WALK_CALLBACK
176 * DESCRIPTION: Check for an unreferenced namespace object and emit a warning.
177 * We have to be careful, because some types and names are
178 * typically or always unreferenced, we don't want to issue
179 * excessive warnings. Note: Names that are declared within a
180 * control method are temporary, so we always issue a remark
181 * if they are not referenced.
183 ******************************************************************************/
187 ACPI_HANDLE ObjHandle,
192 ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
193 ACPI_NAMESPACE_NODE *Next;
196 /* Referenced flag is set during the namespace xref */
198 if (Node->Flags & ANOBJ_IS_REFERENCED)
208 /* These types are typically never directly referenced, ignore them */
212 case ACPI_TYPE_DEVICE:
213 case ACPI_TYPE_PROCESSOR:
214 case ACPI_TYPE_POWER:
215 case ACPI_TYPE_THERMAL:
216 case ACPI_TYPE_LOCAL_RESOURCE:
225 /* Determine if the name is within a control method */
230 if (Next->Type == ACPI_TYPE_METHOD)
233 * Name is within a method, therefore it is temporary.
234 * Issue a remark even if it is a reserved name (starts
235 * with an underscore).
237 sprintf (MsgBuffer, "Name is within method [%4.4s]",
239 AslError (ASL_REMARK, ASL_MSG_NOT_REFERENCED,
240 LkGetNameOp (Node->Op), MsgBuffer);
247 /* The name is not within a control method */
250 * Ignore names that start with an underscore. These are the reserved
251 * ACPI names and are typically not referenced since they are meant
252 * to be called by the host OS.
254 if (Node->Name.Ascii[0] == '_')
260 * What remains is an unresolved user name that is not within a method.
261 * However, the object could be referenced via another table, so issue
262 * the warning at level 2.
264 AslError (ASL_WARNING2, ASL_MSG_NOT_REFERENCED,
265 LkGetNameOp (Node->Op), NULL);
270 /*******************************************************************************
272 * FUNCTION: LkGetNameOp
274 * PARAMETERS: Op - Current Op
276 * RETURN: NameOp associated with the input op
278 * DESCRIPTION: Find the name declaration op associated with the operator
280 ******************************************************************************/
282 static ACPI_PARSE_OBJECT *
284 ACPI_PARSE_OBJECT *Op)
286 const ACPI_OPCODE_INFO *OpInfo;
287 ACPI_PARSE_OBJECT *NameOp = Op;
290 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
293 /* Get the NamePath from the appropriate place */
295 if (OpInfo->Flags & AML_NAMED)
297 /* For nearly all NAMED operators, the name reference is the first child */
299 NameOp = Op->Asl.Child;
300 if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
303 * ALIAS is the only oddball opcode, the name declaration
304 * (alias name) is the second operand
306 NameOp = Op->Asl.Child->Asl.Next;
309 else if (OpInfo->Flags & AML_CREATE)
311 /* Name must appear as the last parameter */
313 NameOp = Op->Asl.Child;
314 while (!(NameOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
316 NameOp = NameOp->Asl.Next;