1 /******************************************************************************
2 *
3 * Module Name: aslmethod.c - Control method analysis walk
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2023, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
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
19 * property rights.
20 *
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
27 *
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;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
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.
53 *
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
64 * make.
65 *
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
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
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.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
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
88 * PARTICULAR PURPOSE.
89 *
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
97 * LIMITED REMEDY.
98 *
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.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #include <contrib/dev/acpica/compiler/aslcompiler.h>
153 #include "aslcompiler.y.h"
154 #include <contrib/dev/acpica/include/acnamesp.h>
155 #include <contrib/dev/acpica/include/acparser.h>
156 #include <contrib/dev/acpica/include/amlcode.h>
157
158
159 #define _COMPONENT ACPI_COMPILER
160 ACPI_MODULE_NAME ("aslmethod")
161
162
163 /* Local prototypes */
164
165 static void
166 MtCheckNamedObjectInMethod (
167 ACPI_PARSE_OBJECT *Op,
168 ASL_METHOD_INFO *MethodInfo);
169
170 static void
171 MtCheckStaticOperationRegionInMethod (
172 ACPI_PARSE_OBJECT *Op);
173
174
175 /*******************************************************************************
176 *
177 * FUNCTION: MtMethodAnalysisWalkBegin
178 *
179 * PARAMETERS: ASL_WALK_CALLBACK
180 *
181 * RETURN: Status
182 *
183 * DESCRIPTION: Descending callback for the analysis walk. Check methods for:
184 * 1) Initialized local variables
185 * 2) Valid arguments
186 * 3) Return types
187 *
188 ******************************************************************************/
189
190 ACPI_STATUS
MtMethodAnalysisWalkBegin(ACPI_PARSE_OBJECT * Op,UINT32 Level,void * Context)191 MtMethodAnalysisWalkBegin (
192 ACPI_PARSE_OBJECT *Op,
193 UINT32 Level,
194 void *Context)
195 {
196 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
197 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
198 ACPI_PARSE_OBJECT *Next;
199 UINT32 RegisterNumber;
200 UINT32 i;
201 char LocalName[] = "Local0";
202 char ArgName[] = "Arg0";
203 ACPI_PARSE_OBJECT *ArgNode;
204 ACPI_PARSE_OBJECT *NextType;
205 UINT8 ActualArgs = 0;
206 BOOLEAN HidExists;
207 BOOLEAN AdrExists;
208 BOOLEAN PrsExists;
209 BOOLEAN CrsExists;
210 BOOLEAN SrsExists;
211 BOOLEAN DisExists;
212
213
214 /* Build cross-reference output file if requested */
215
216 if (AslGbl_CrossReferenceOutput)
217 {
218 OtXrefWalkPart1 (Op, Level, MethodInfo);
219 }
220
221 switch (Op->Asl.ParseOpcode)
222 {
223 case PARSEOP_METHOD:
224
225 AslGbl_TotalMethods++;
226
227 /* Create and init method info */
228
229 MethodInfo = UtLocalCalloc (sizeof (ASL_METHOD_INFO));
230 MethodInfo->Next = WalkInfo->MethodStack;
231 MethodInfo->Op = Op;
232
233 WalkInfo->MethodStack = MethodInfo;
234
235 /*
236 * Special handling for _PSx methods. Dependency rules (same scope):
237 *
238 * 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3
239 * 2) _PS1/_PS2/_PS3: A _PS0 must exist
240 */
241 if (ACPI_COMPARE_NAMESEG (METHOD_NAME__PS0, Op->Asl.NameSeg))
242 {
243 /* For _PS0, one of _PS1/_PS2/_PS3 must exist */
244
245 if ((!ApFindNameInScope (METHOD_NAME__PS1, Op)) &&
246 (!ApFindNameInScope (METHOD_NAME__PS2, Op)) &&
247 (!ApFindNameInScope (METHOD_NAME__PS3, Op)))
248 {
249 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
250 "_PS0 requires one of _PS1/_PS2/_PS3 in same scope");
251 }
252 }
253 else if (
254 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS1, Op->Asl.NameSeg) ||
255 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS2, Op->Asl.NameSeg) ||
256 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS3, Op->Asl.NameSeg))
257 {
258 /* For _PS1/_PS2/_PS3, a _PS0 must exist */
259
260 if (!ApFindNameInScope (METHOD_NAME__PS0, Op))
261 {
262 sprintf (AslGbl_MsgBuffer,
263 "%4.4s requires _PS0 in same scope", Op->Asl.NameSeg);
264
265 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
266 AslGbl_MsgBuffer);
267 }
268 }
269
270 /* Get the name node */
271
272 Next = Op->Asl.Child;
273
274 /* Get the NumArguments node */
275
276 Next = Next->Asl.Next;
277 MethodInfo->NumArguments = (UINT8)
278 (((UINT8) Next->Asl.Value.Integer) & 0x07);
279
280 /* Get the SerializeRule and SyncLevel nodes, ignored here */
281
282 Next = Next->Asl.Next;
283 MethodInfo->ShouldBeSerialized = (UINT8) Next->Asl.Value.Integer;
284
285 Next = Next->Asl.Next;
286 ArgNode = Next;
287
288 /* Get the ReturnType node */
289
290 Next = Next->Asl.Next;
291
292 NextType = Next->Asl.Child;
293
294 MethodInfo->ValidReturnTypes = MtProcessTypeOp (NextType);
295 Op->Asl.AcpiBtype |= MethodInfo->ValidReturnTypes;
296
297 /* Get the ParameterType node */
298
299 Next = Next->Asl.Next;
300
301 NextType = Next->Asl.Child;
302 if (!NextType)
303 {
304 /*
305 * The optional parameter types list was omitted at the source
306 * level. Use the Argument count parameter instead.
307 */
308 ActualArgs = MethodInfo->NumArguments;
309 }
310 else
311 {
312 ActualArgs = MtProcessParameterTypeList (NextType,
313 MethodInfo->ValidArgTypes);
314 MethodInfo->NumArguments = ActualArgs;
315 ArgNode->Asl.Value.Integer |= ActualArgs;
316 }
317
318 if ((MethodInfo->NumArguments) &&
319 (MethodInfo->NumArguments != ActualArgs))
320 {
321 sprintf (AslGbl_MsgBuffer,
322 "Length = %u", ActualArgs);
323 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_MISMATCH,
324 Op->Asl.Child->Asl.Next, AslGbl_MsgBuffer);
325 }
326
327 /* Allow numarguments == 0 for Function() */
328
329 if ((!MethodInfo->NumArguments) && (ActualArgs))
330 {
331 MethodInfo->NumArguments = ActualArgs;
332 ArgNode->Asl.Value.Integer |= ActualArgs;
333 }
334
335 /*
336 * Actual arguments are initialized at method entry.
337 * All other ArgX "registers" can be used as locals, so we
338 * track their initialization.
339 */
340 for (i = 0; i < MethodInfo->NumArguments; i++)
341 {
342 MethodInfo->ArgInitialized[i] = TRUE;
343 }
344 break;
345
346 case PARSEOP_METHODCALL:
347
348 /* Check for a recursive method call */
349
350 if (MethodInfo &&
351 (Op->Asl.Node == MethodInfo->Op->Asl.Node))
352 {
353 if (MethodInfo->CreatesNamedObjects)
354 {
355 /*
356 * This is an error, as it will fail at runtime on all ACPI
357 * implementations. Any named object declarations will be
358 * executed twice, causing failure the second time. Note,
359 * this is independent of whether the method is declared
360 * Serialized, because the same thread is attempting to
361 * reenter the method, and this will always succeed.
362 */
363 AslDualParseOpError (ASL_ERROR, ASL_MSG_ILLEGAL_RECURSION, Op,
364 Op->Asl.Value.String, ASL_MSG_FOUND_HERE, MethodInfo->Op,
365 MethodInfo->Op->Asl.ExternalName);
366 }
367 else
368 {
369 /* Method does not create objects, issue a remark */
370
371 AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName);
372 }
373 }
374 break;
375
376 case PARSEOP_LOCAL0:
377 case PARSEOP_LOCAL1:
378 case PARSEOP_LOCAL2:
379 case PARSEOP_LOCAL3:
380 case PARSEOP_LOCAL4:
381 case PARSEOP_LOCAL5:
382 case PARSEOP_LOCAL6:
383 case PARSEOP_LOCAL7:
384
385 if (!MethodInfo)
386 {
387 /*
388 * Local was used outside a control method, or there was an error
389 * in the method declaration.
390 */
391 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
392 Op, Op->Asl.ExternalName);
393 return (AE_ERROR);
394 }
395
396 RegisterNumber = (Op->Asl.AmlOpcode & 0x0007);
397
398 /*
399 * If the local is being used as a target, mark the local
400 * initialized
401 */
402 if (Op->Asl.CompileFlags & OP_IS_TARGET)
403 {
404 MethodInfo->LocalInitialized[RegisterNumber] = TRUE;
405 }
406
407 /*
408 * Otherwise, this is a reference, check if the local
409 * has been previously initialized.
410 *
411 * The only operator that accepts an uninitialized value is ObjectType()
412 */
413 else if ((!MethodInfo->LocalInitialized[RegisterNumber]) &&
414 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
415 {
416 LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30);
417 AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName);
418 }
419 break;
420
421 case PARSEOP_ARG0:
422 case PARSEOP_ARG1:
423 case PARSEOP_ARG2:
424 case PARSEOP_ARG3:
425 case PARSEOP_ARG4:
426 case PARSEOP_ARG5:
427 case PARSEOP_ARG6:
428
429 if (!MethodInfo)
430 {
431 /*
432 * Arg was used outside a control method, or there was an error
433 * in the method declaration.
434 */
435 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
436 Op, Op->Asl.ExternalName);
437 return (AE_ERROR);
438 }
439
440 RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8;
441 ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30);
442
443 /*
444 * If the Arg is being used as a target, mark the local
445 * initialized
446 */
447 if (Op->Asl.CompileFlags & OP_IS_TARGET)
448 {
449 MethodInfo->ArgInitialized[RegisterNumber] = TRUE;
450 }
451
452 /*
453 * Otherwise, this is a reference, check if the Arg
454 * has been previously initialized.
455 *
456 * The only operator that accepts an uninitialized value is ObjectType()
457 */
458 else if ((!MethodInfo->ArgInitialized[RegisterNumber]) &&
459 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
460 {
461 AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName);
462 }
463
464 /* Flag this arg if it is not a "real" argument to the method */
465
466 if (RegisterNumber >= MethodInfo->NumArguments)
467 {
468 AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName);
469 }
470 break;
471
472 case PARSEOP_RETURN:
473
474 if (!MethodInfo)
475 {
476 /*
477 * Probably was an error in the method declaration,
478 * no additional error here
479 */
480 ACPI_WARNING ((AE_INFO, "%p, No parent method", Op));
481 return (AE_ERROR);
482 }
483
484 /*
485 * A child indicates a possible return value. A simple Return or
486 * Return() is marked with OP_IS_NULL_RETURN by the parser so
487 * that it is not counted as a "real" return-with-value, although
488 * the AML code that is actually emitted is Return(0). The AML
489 * definition of Return has a required parameter, so we are
490 * forced to convert a null return to Return(0).
491 */
492 if ((Op->Asl.Child) &&
493 (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) &&
494 (!(Op->Asl.Child->Asl.CompileFlags & OP_IS_NULL_RETURN)))
495 {
496 MethodInfo->NumReturnWithValue++;
497 }
498 else
499 {
500 MethodInfo->NumReturnNoValue++;
501 }
502 break;
503
504 case PARSEOP_BREAK:
505 case PARSEOP_CONTINUE:
506
507 Next = Op->Asl.Parent;
508 while (Next)
509 {
510 if (Next->Asl.ParseOpcode == PARSEOP_WHILE)
511 {
512 break;
513 }
514 Next = Next->Asl.Parent;
515 }
516
517 if (!Next)
518 {
519 AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL);
520 }
521 break;
522
523 case PARSEOP_STALL:
524
525 /* We can range check if the argument is an integer */
526
527 if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) &&
528 (Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX))
529 {
530 AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL);
531 }
532 break;
533
534 case PARSEOP_DEVICE:
535
536 /* Check usage of _HID and _ADR objects */
537
538 HidExists = ApFindNameInDeviceTree (METHOD_NAME__HID, Op);
539 AdrExists = ApFindNameInDeviceTree (METHOD_NAME__ADR, Op);
540
541 if (!HidExists && !AdrExists)
542 {
543 AslError (ASL_ERROR, ASL_MSG_MISSING_DEPENDENCY, Op,
544 "Device object requires a _HID or _ADR");
545 }
546 else if (HidExists && AdrExists)
547 {
548 /*
549 * According to the ACPI spec, "A device object must contain
550 * either an _HID object or an _ADR object, but should not contain
551 * both".
552 */
553 AslError (ASL_WARNING, ASL_MSG_MULTIPLE_TYPES, Op,
554 "Device object requires either a _HID or _ADR, but not both");
555 }
556
557 /*
558 * Check usage of _CRS, _DIS, _PRS, and _SRS objects (July 2021).
559 *
560 * Under the Device Object:
561 *
562 * 1) If _PRS present, must have _CRS and _SRS
563 * 2) If _SRS present, must have _PRS (_PRS requires _CRS and _SRS)
564 * 3) If _DIS present, must have _SRS (_SRS requires _PRS, _PRS requires _CRS and _SRS)
565 * 4) If _SRS present, probably should have a _DIS (Remark only)
566 */
567 CrsExists = ApFindNameInDeviceTree (METHOD_NAME__CRS, Op);
568 DisExists = ApFindNameInDeviceTree (METHOD_NAME__DIS, Op);
569 PrsExists = ApFindNameInDeviceTree (METHOD_NAME__PRS, Op);
570 SrsExists = ApFindNameInDeviceTree (METHOD_NAME__SRS, Op);
571
572 /* 1) If _PRS is present, must have a _CRS and _SRS */
573
574 if (PrsExists)
575 {
576 if (!CrsExists)
577 {
578 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
579 "Device has a _PRS, missing a _CRS, required");
580 }
581 if (!SrsExists)
582 {
583 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
584 "Device has a _PRS, missing a _SRS, required");
585 }
586 }
587
588 /* 2) If _SRS is present, must have _PRS (_PRS requires _CRS and _SRS) */
589
590 if ((SrsExists) && (!PrsExists))
591 {
592 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
593 "Device has a _SRS, missing a _PRS, required");
594 }
595
596 /* 3) If _DIS is present, must have a _SRS */
597
598 if ((DisExists) && (!SrsExists))
599 {
600 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
601 "Device has a _DIS, missing a _SRS, required");
602 }
603
604 /*
605 * 4) If _SRS is present, should have a _DIS (_PRS requires _CRS
606 * and _SRS) Remark only.
607 */
608 if ((SrsExists) && (!DisExists))
609 {
610 AslError (ASL_REMARK, ASL_MSG_MISSING_DEPENDENCY, Op,
611 "Device has a _SRS, no corresponding _DIS");
612 }
613 break;
614
615 case PARSEOP_EVENT:
616 case PARSEOP_MUTEX:
617 case PARSEOP_OPERATIONREGION:
618 case PARSEOP_POWERRESOURCE:
619 case PARSEOP_PROCESSOR:
620 case PARSEOP_THERMALZONE:
621
622 /*
623 * The first operand is a name to be created in the namespace.
624 * Check against the reserved list.
625 */
626 i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg);
627 if (i < ACPI_VALID_RESERVED_NAME_MAX)
628 {
629 AslError (ASL_ERROR, ASL_MSG_RESERVED_USE,
630 Op, Op->Asl.ExternalName);
631 }
632
633 MtCheckStaticOperationRegionInMethod (Op);
634 break;
635
636 case PARSEOP_NAME:
637
638 /* Typecheck any predefined names statically defined with Name() */
639
640 ApCheckForPredefinedObject (Op, Op->Asl.NameSeg);
641
642 /* Special typechecking for _HID */
643
644 if (ACPI_COMPARE_NAMESEG (METHOD_NAME__HID, Op->Asl.NameSeg))
645 {
646 Next = Op->Asl.Child->Asl.Next;
647 AnCheckId (Next, ASL_TYPE_HID);
648 }
649
650 /* Special typechecking for _CID */
651
652 else if (ACPI_COMPARE_NAMESEG (METHOD_NAME__CID, Op->Asl.NameSeg))
653 {
654 Next = Op->Asl.Child->Asl.Next;
655
656 if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) ||
657 (Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE))
658 {
659 Next = Next->Asl.Child;
660 while (Next)
661 {
662 AnCheckId (Next, ASL_TYPE_CID);
663 Next = Next->Asl.Next;
664 }
665 }
666 else
667 {
668 AnCheckId (Next, ASL_TYPE_CID);
669 }
670 }
671
672 break;
673
674 default:
675
676 break;
677 }
678
679 /* Check for named object creation within a non-serialized method */
680
681 MtCheckNamedObjectInMethod (Op, MethodInfo);
682 return (AE_OK);
683 }
684
685
686 /*******************************************************************************
687 *
688 * FUNCTION: MtProcessTypeOp
689 *
690 * PARAMETERS: Op - Op representing a btype
691 *
692 * RETURN: Btype represented by Op
693 *
694 * DESCRIPTION: Process a parse object that represents single parameter type or
695 * a return type in method, function, and external declarations.
696 *
697 ******************************************************************************/
698
699 UINT32
MtProcessTypeOp(ACPI_PARSE_OBJECT * TypeOp)700 MtProcessTypeOp (
701 ACPI_PARSE_OBJECT *TypeOp)
702 {
703 UINT32 Btype = ACPI_BTYPE_ANY;
704
705
706 while (TypeOp)
707 {
708 Btype |= AnMapObjTypeToBtype (TypeOp);
709 TypeOp->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
710 TypeOp = TypeOp->Asl.Next;
711 }
712
713 return (Btype);
714 }
715
716
717 /*******************************************************************************
718 *
719 * FUNCTION: MtProcessParameterTypeList
720 *
721 * PARAMETERS: Op - Op representing a btype
722 *
723 * RETURN: Btype represented by Op
724 *
725 * DESCRIPTION: Process a parse object that represents a parameter type list in
726 * method, function, and external declarations.
727 *
728 ******************************************************************************/
729
730 UINT8
MtProcessParameterTypeList(ACPI_PARSE_OBJECT * ParamTypeOp,UINT32 * TypeList)731 MtProcessParameterTypeList (
732 ACPI_PARSE_OBJECT *ParamTypeOp,
733 UINT32 *TypeList)
734 {
735 UINT8 ParameterCount = 0;
736
737
738 if (ParamTypeOp && ParamTypeOp->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG)
739 {
740 /* Special case for a single parameter without braces */
741
742 TypeList[ParameterCount] =
743 MtProcessTypeOp (ParamTypeOp);
744
745 return (1);
746 }
747
748 while (ParamTypeOp)
749 {
750 TypeList[ParameterCount] =
751 MtProcessTypeOp (ParamTypeOp->Asl.Child);
752
753 ParameterCount++;
754 ParamTypeOp = ParamTypeOp->Asl.Next;
755 }
756
757 return (ParameterCount);
758 }
759
760
761 /*******************************************************************************
762 *
763 * FUNCTION: MtCheckNamedObjectInMethod
764 *
765 * PARAMETERS: Op - Current parser op
766 * MethodInfo - Info for method being parsed
767 *
768 * RETURN: None
769 *
770 * DESCRIPTION: Detect if a non-serialized method is creating a named object,
771 * which could possibly cause problems if two threads execute
772 * the method concurrently. Emit a remark in this case.
773 *
774 ******************************************************************************/
775
776 static void
MtCheckNamedObjectInMethod(ACPI_PARSE_OBJECT * Op,ASL_METHOD_INFO * MethodInfo)777 MtCheckNamedObjectInMethod (
778 ACPI_PARSE_OBJECT *Op,
779 ASL_METHOD_INFO *MethodInfo)
780 {
781 const ACPI_OPCODE_INFO *OpInfo;
782 char *ExternalPath;
783
784
785 /* We don't care about actual method declarations or scopes */
786
787 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) ||
788 (Op->Asl.AmlOpcode == AML_SCOPE_OP))
789 {
790 return;
791 }
792
793 /* Determine if we are creating a named object within a method */
794
795 if (!MethodInfo)
796 {
797 return;
798 }
799
800 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
801 if ((OpInfo->Class == AML_CLASS_NAMED_OBJECT) && (Op->Asl.AmlOpcode != AML_FIELD_OP))
802 {
803 /*
804 * 1) Mark the method as a method that creates named objects.
805 *
806 * 2) Issue a remark indicating the inefficiency of creating named
807 * objects within a method (Except for compiler-emitted temporary
808 * variables).
809 *
810 * 3) If the method is non-serialized, emit a remark that the method
811 * should be serialized.
812 *
813 * Reason: If a thread blocks within the method for any reason, and
814 * another thread enters the method, the method will fail because
815 * an attempt will be made to create the same object twice.
816 *
817 * Note: The Field opcode is disallowed here because Field() does not
818 * create a new named object.
819 */
820 ExternalPath = AcpiNsGetNormalizedPathname (MethodInfo->Op->Asl.Node, TRUE);
821
822 /* No error for compiler temp variables (name starts with "_T_") */
823
824 if ((Op->Asl.NameSeg[0] != '_') &&
825 (Op->Asl.NameSeg[1] != 'T') &&
826 (Op->Asl.NameSeg[2] != '_'))
827 {
828 AslError (ASL_REMARK, ASL_MSG_NAMED_OBJECT_CREATION, Op,
829 ExternalPath);
830 }
831
832 MethodInfo->CreatesNamedObjects = TRUE;
833 if (!MethodInfo->ShouldBeSerialized)
834 {
835 AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op,
836 ExternalPath);
837
838 /* Emit message only ONCE per method */
839
840 MethodInfo->ShouldBeSerialized = TRUE;
841 }
842
843 if (ExternalPath)
844 {
845 ACPI_FREE (ExternalPath);
846 }
847 }
848 }
849
850
851 /*******************************************************************************
852 *
853 * FUNCTION: MtCheckStaticOperationRegionInMethod
854 *
855 * PARAMETERS: Op - Current parser op
856 *
857 * RETURN: None
858 *
859 * DESCRIPTION: Warns if an Operation Region with static address or length
860 * is declared inside a control method
861 *
862 ******************************************************************************/
863
864 static void
MtCheckStaticOperationRegionInMethod(ACPI_PARSE_OBJECT * Op)865 MtCheckStaticOperationRegionInMethod(
866 ACPI_PARSE_OBJECT* Op)
867 {
868 ACPI_PARSE_OBJECT* AddressOp;
869 ACPI_PARSE_OBJECT* LengthOp;
870
871
872 if (Op->Asl.ParseOpcode != PARSEOP_OPERATIONREGION)
873 {
874 return;
875 }
876
877 /*
878 * OperationRegion should have 4 arguments defined. At this point, we
879 * assume that the parse tree is well-formed.
880 */
881 AddressOp = Op->Asl.Child->Asl.Next->Asl.Next;
882 LengthOp = Op->Asl.Child->Asl.Next->Asl.Next->Asl.Next;
883
884 if (UtGetParentMethodOp (Op) &&
885 AddressOp->Asl.ParseOpcode == PARSEOP_INTEGER &&
886 LengthOp->Asl.ParseOpcode == PARSEOP_INTEGER)
887 {
888 /*
889 * At this point, a static operation region declared inside of a
890 * control method has been found. Throw a warning because this is
891 * highly inefficient.
892 */
893 AslError(ASL_WARNING, ASL_MSG_STATIC_OPREGION_IN_METHOD, Op, NULL);
894 }
895
896 return;
897 }
898
899
900 /*******************************************************************************
901 *
902 * FUNCTION: MtMethodAnalysisWalkEnd
903 *
904 * PARAMETERS: ASL_WALK_CALLBACK
905 *
906 * RETURN: Status
907 *
908 * DESCRIPTION: Ascending callback for analysis walk. Complete method
909 * return analysis.
910 *
911 ******************************************************************************/
912
913 ACPI_STATUS
MtMethodAnalysisWalkEnd(ACPI_PARSE_OBJECT * Op,UINT32 Level,void * Context)914 MtMethodAnalysisWalkEnd (
915 ACPI_PARSE_OBJECT *Op,
916 UINT32 Level,
917 void *Context)
918 {
919 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
920 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
921 char *ExternalPath;
922
923
924 switch (Op->Asl.ParseOpcode)
925 {
926 case PARSEOP_METHOD:
927 case PARSEOP_RETURN:
928
929 if (!MethodInfo)
930 {
931 printf ("No method info for method! [%s]\n", Op->Asl.Namepath);
932 AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op,
933 "No method info for this method");
934
935 CmCleanupAndExit ();
936 return (AE_AML_INTERNAL);
937 }
938 break;
939
940 default:
941
942 break;
943 }
944
945 switch (Op->Asl.ParseOpcode)
946 {
947 case PARSEOP_METHOD:
948
949 WalkInfo->MethodStack = MethodInfo->Next;
950
951 /*
952 * Check if there is no return statement at the end of the
953 * method AND we can actually get there -- i.e., the execution
954 * of the method can possibly terminate without a return statement.
955 */
956 if ((!AnLastStatementIsReturn (Op)) &&
957 (!(Op->Asl.CompileFlags & OP_HAS_NO_EXIT)))
958 {
959 /*
960 * No return statement, and execution can possibly exit
961 * via this path. This is equivalent to Return ()
962 */
963 MethodInfo->NumReturnNoValue++;
964 }
965
966 /*
967 * Check for case where some return statements have a return value
968 * and some do not. Exit without a return statement is a return with
969 * no value
970 */
971 if (MethodInfo->NumReturnNoValue &&
972 MethodInfo->NumReturnWithValue)
973 {
974 ExternalPath = AcpiNsGetNormalizedPathname (Op->Asl.Node, TRUE);
975
976 AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op,
977 ExternalPath);
978
979 if (ExternalPath)
980 {
981 ACPI_FREE (ExternalPath);
982 }
983 }
984
985 /*
986 * If there are any RETURN() statements with no value, or there is a
987 * control path that allows the method to exit without a return value,
988 * we mark the method as a method that does not return a value. This
989 * knowledge can be used to check method invocations that expect a
990 * returned value.
991 */
992 if (MethodInfo->NumReturnNoValue)
993 {
994 if (MethodInfo->NumReturnWithValue)
995 {
996 Op->Asl.CompileFlags |= OP_METHOD_SOME_NO_RETVAL;
997 }
998 else
999 {
1000 Op->Asl.CompileFlags |= OP_METHOD_NO_RETVAL;
1001 }
1002 }
1003
1004 /*
1005 * Check predefined method names for correct return behavior
1006 * and correct number of arguments. Also, some special checks
1007 * For GPE and _REG methods.
1008 */
1009 if (ApCheckForPredefinedMethod (Op, MethodInfo))
1010 {
1011 /* Special check for two names like _L01 and _E01 in same scope */
1012
1013 ApCheckForGpeNameConflict (Op);
1014
1015 /*
1016 * Special check for _REG: Must have an operation region definition
1017 * within the same scope!
1018 */
1019 ApCheckRegMethod (Op);
1020 }
1021
1022 ACPI_FREE (MethodInfo);
1023 break;
1024
1025 case PARSEOP_NAME:
1026
1027 /* Special check for two names like _L01 and _E01 in same scope */
1028
1029 ApCheckForGpeNameConflict (Op);
1030 break;
1031
1032 case PARSEOP_RETURN:
1033
1034 /*
1035 * If the parent is a predefined method name, attempt to typecheck
1036 * the return value. Only static types can be validated.
1037 */
1038 ApCheckPredefinedReturnValue (Op, MethodInfo);
1039
1040 /*
1041 * The parent block does not "exit" and continue execution -- the
1042 * method is terminated here with the Return() statement.
1043 */
1044 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
1045
1046 /* Used in the "typing" pass later */
1047
1048 Op->Asl.ParentMethod = MethodInfo->Op;
1049
1050 /*
1051 * If there is a peer node after the return statement, then this
1052 * node is unreachable code -- i.e., it won't be executed because of
1053 * the preceding Return() statement.
1054 */
1055 if (Op->Asl.Next)
1056 {
1057 AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE,
1058 Op->Asl.Next, NULL);
1059 }
1060 break;
1061
1062 case PARSEOP_IF:
1063
1064 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
1065 (Op->Asl.Next) &&
1066 (Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE))
1067 {
1068 /*
1069 * This IF has a corresponding ELSE. The IF block has no exit,
1070 * (it contains an unconditional Return)
1071 * mark the ELSE block to remember this fact.
1072 */
1073 Op->Asl.Next->Asl.CompileFlags |= OP_IF_HAS_NO_EXIT;
1074 }
1075 break;
1076
1077 case PARSEOP_ELSE:
1078
1079 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
1080 (Op->Asl.CompileFlags & OP_IF_HAS_NO_EXIT))
1081 {
1082 /*
1083 * This ELSE block has no exit and the corresponding IF block
1084 * has no exit either. Therefore, the parent node has no exit.
1085 */
1086 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
1087 }
1088 break;
1089
1090
1091 default:
1092
1093 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
1094 (Op->Asl.Parent))
1095 {
1096 /* If this node has no exit, then the parent has no exit either */
1097
1098 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
1099 }
1100 break;
1101 }
1102
1103 return (AE_OK);
1104 }
1105