asllookup.c revision 245582 
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 <contrib/dev/acpica/compiler/aslcompiler.h>
46#include "aslcompiler.y.h"
47#include <contrib/dev/acpica/include/acparser.h>
48#include <contrib/dev/acpica/include/amlcode.h>
49#include <contrib/dev/acpica/include/acnamesp.h>
50#include <contrib/dev/acpica/include/acdispat.h>
51
52
53#define _COMPONENT          ACPI_COMPILER
54        ACPI_MODULE_NAME    ("asllookup")
55
56/* Local prototypes */
57
58static ACPI_STATUS
59LkIsObjectUsed (
60    ACPI_HANDLE             ObjHandle,
61    UINT32                  Level,
62    void                    *Context,
63    void                    **ReturnValue);
64
65static ACPI_PARSE_OBJECT *
66LkGetNameOp (
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
84void
85LkFindUnreferencedObjects (
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
112static ACPI_STATUS
113LkIsObjectUsed (
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        return (AE_OK);
148
149    default:
150        break;
151    }
152
153    /* All others are valid unreferenced namespace objects */
154
155    if (Node->Op)
156    {
157        AslError (ASL_WARNING2, ASL_MSG_NOT_REFERENCED, LkGetNameOp (Node->Op), NULL);
158    }
159    return (AE_OK);
160}
161
162
163/*******************************************************************************
164 *
165 * FUNCTION:    LkGetNameOp
166 *
167 * PARAMETERS:  Op              - Current Op
168 *
169 * RETURN:      NameOp associated with the input op
170 *
171 * DESCRIPTION: Find the name declaration op associated with the operator
172 *
173 ******************************************************************************/
174
175static ACPI_PARSE_OBJECT *
176LkGetNameOp (
177    ACPI_PARSE_OBJECT       *Op)
178{
179    const ACPI_OPCODE_INFO  *OpInfo;
180    ACPI_PARSE_OBJECT       *NameOp = Op;
181
182
183    OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
184
185
186    /* Get the NamePath from the appropriate place */
187
188    if (OpInfo->Flags & AML_NAMED)
189    {
190        /* For nearly all NAMED operators, the name reference is the first child */
191
192        NameOp = Op->Asl.Child;
193        if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
194        {
195            /*
196             * ALIAS is the only oddball opcode, the name declaration
197             * (alias name) is the second operand
198             */
199            NameOp = Op->Asl.Child->Asl.Next;
200        }
201    }
202    else if (OpInfo->Flags & AML_CREATE)
203    {
204        /* Name must appear as the last parameter */
205
206        NameOp = Op->Asl.Child;
207        while (!(NameOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
208        {
209            NameOp = NameOp->Asl.Next;
210        }
211    }
212
213    return (NameOp);
214}
215