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 - 2018, 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 "aslcompiler.h"
153 #include "aslcompiler.y.h"
154 #include "acparser.h"
155 #include "amlcode.h"
156
157
158 #define _COMPONENT ACPI_COMPILER
159 ACPI_MODULE_NAME ("aslmethod")
160
161
162 /* Local prototypes */
163
164 static void
165 MtCheckNamedObjectInMethod (
166 ACPI_PARSE_OBJECT *Op,
167 ASL_METHOD_INFO *MethodInfo);
168
169
170 /*******************************************************************************
171 *
172 * FUNCTION: MtMethodAnalysisWalkBegin
173 *
174 * PARAMETERS: ASL_WALK_CALLBACK
175 *
176 * RETURN: Status
177 *
178 * DESCRIPTION: Descending callback for the analysis walk. Check methods for:
179 * 1) Initialized local variables
180 * 2) Valid arguments
181 * 3) Return types
182 *
183 ******************************************************************************/
184
185 ACPI_STATUS
MtMethodAnalysisWalkBegin(ACPI_PARSE_OBJECT * Op,UINT32 Level,void * Context)186 MtMethodAnalysisWalkBegin (
187 ACPI_PARSE_OBJECT *Op,
188 UINT32 Level,
189 void *Context)
190 {
191 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
192 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
193 ACPI_PARSE_OBJECT *Next;
194 UINT32 RegisterNumber;
195 UINT32 i;
196 char LocalName[] = "Local0";
197 char ArgName[] = "Arg0";
198 ACPI_PARSE_OBJECT *ArgNode;
199 ACPI_PARSE_OBJECT *NextType;
200 ACPI_PARSE_OBJECT *NextParamType;
201 UINT8 ActualArgs = 0;
202
203
204 /* Build cross-reference output file if requested */
205
206 if (Gbl_CrossReferenceOutput)
207 {
208 OtXrefWalkPart1 (Op, Level, MethodInfo);
209 }
210
211 switch (Op->Asl.ParseOpcode)
212 {
213 case PARSEOP_METHOD:
214
215 TotalMethods++;
216
217 /* Create and init method info */
218
219 MethodInfo = UtLocalCalloc (sizeof (ASL_METHOD_INFO));
220 MethodInfo->Next = WalkInfo->MethodStack;
221 MethodInfo->Op = Op;
222
223 WalkInfo->MethodStack = MethodInfo;
224
225 /*
226 * Special handling for _PSx methods. Dependency rules (same scope):
227 *
228 * 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3
229 * 2) _PS1/_PS2/_PS3: A _PS0 must exist
230 */
231 if (ACPI_COMPARE_NAME (METHOD_NAME__PS0, Op->Asl.NameSeg))
232 {
233 /* For _PS0, one of _PS1/_PS2/_PS3 must exist */
234
235 if ((!ApFindNameInScope (METHOD_NAME__PS1, Op)) &&
236 (!ApFindNameInScope (METHOD_NAME__PS2, Op)) &&
237 (!ApFindNameInScope (METHOD_NAME__PS3, Op)))
238 {
239 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
240 "_PS0 requires one of _PS1/_PS2/_PS3 in same scope");
241 }
242 }
243 else if (
244 ACPI_COMPARE_NAME (METHOD_NAME__PS1, Op->Asl.NameSeg) ||
245 ACPI_COMPARE_NAME (METHOD_NAME__PS2, Op->Asl.NameSeg) ||
246 ACPI_COMPARE_NAME (METHOD_NAME__PS3, Op->Asl.NameSeg))
247 {
248 /* For _PS1/_PS2/_PS3, a _PS0 must exist */
249
250 if (!ApFindNameInScope (METHOD_NAME__PS0, Op))
251 {
252 sprintf (MsgBuffer,
253 "%4.4s requires _PS0 in same scope", Op->Asl.NameSeg);
254
255 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
256 MsgBuffer);
257 }
258 }
259
260 /* Get the name node */
261
262 Next = Op->Asl.Child;
263
264 /* Get the NumArguments node */
265
266 Next = Next->Asl.Next;
267 MethodInfo->NumArguments = (UINT8)
268 (((UINT8) Next->Asl.Value.Integer) & 0x07);
269
270 /* Get the SerializeRule and SyncLevel nodes, ignored here */
271
272 Next = Next->Asl.Next;
273 MethodInfo->ShouldBeSerialized = (UINT8) Next->Asl.Value.Integer;
274
275 Next = Next->Asl.Next;
276 ArgNode = Next;
277
278 /* Get the ReturnType node */
279
280 Next = Next->Asl.Next;
281
282 NextType = Next->Asl.Child;
283 while (NextType)
284 {
285 /* Get and map each of the ReturnTypes */
286
287 MethodInfo->ValidReturnTypes |= AnMapObjTypeToBtype (NextType);
288 NextType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
289 NextType = NextType->Asl.Next;
290 }
291
292 /* Get the ParameterType node */
293
294 Next = Next->Asl.Next;
295
296 NextType = Next->Asl.Child;
297 while (NextType)
298 {
299 if (NextType->Asl.ParseOpcode == PARSEOP_DEFAULT_ARG)
300 {
301 NextParamType = NextType->Asl.Child;
302 while (NextParamType)
303 {
304 MethodInfo->ValidArgTypes[ActualArgs] |=
305 AnMapObjTypeToBtype (NextParamType);
306
307 NextParamType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
308 NextParamType = NextParamType->Asl.Next;
309 }
310 }
311 else
312 {
313 MethodInfo->ValidArgTypes[ActualArgs] =
314 AnMapObjTypeToBtype (NextType);
315
316 NextType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG;
317 ActualArgs++;
318 }
319
320 NextType = NextType->Asl.Next;
321 }
322
323 if ((MethodInfo->NumArguments) &&
324 (MethodInfo->NumArguments != ActualArgs))
325 {
326 /* error: Param list did not match number of args */
327 }
328
329 /* Allow numarguments == 0 for Function() */
330
331 if ((!MethodInfo->NumArguments) && (ActualArgs))
332 {
333 MethodInfo->NumArguments = ActualArgs;
334 ArgNode->Asl.Value.Integer |= ActualArgs;
335 }
336
337 /*
338 * Actual arguments are initialized at method entry.
339 * All other ArgX "registers" can be used as locals, so we
340 * track their initialization.
341 */
342 for (i = 0; i < MethodInfo->NumArguments; i++)
343 {
344 MethodInfo->ArgInitialized[i] = TRUE;
345 }
346 break;
347
348 case PARSEOP_METHODCALL:
349
350 /* Check for a recursive method call */
351
352 if (MethodInfo &&
353 (Op->Asl.Node == MethodInfo->Op->Asl.Node))
354 {
355 if (MethodInfo->CreatesNamedObjects)
356 {
357 /*
358 * This is an error, as it will fail at runtime on all ACPI
359 * implementations. Any named object declarations will be
360 * executed twice, causing failure the second time. Note,
361 * this is independent of whether the method is declared
362 * Serialized, because the same thread is attempting to
363 * reenter the method, and this will always succeed.
364 */
365 AslDualParseOpError (ASL_ERROR, ASL_MSG_ILLEGAL_RECURSION, Op,
366 Op->Asl.Value.String, ASL_MSG_FOUND_HERE, MethodInfo->Op,
367 MethodInfo->Op->Asl.ExternalName);
368 }
369 else
370 {
371 /* Method does not create objects, issue a remark */
372
373 AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName);
374 }
375 }
376 break;
377
378 case PARSEOP_LOCAL0:
379 case PARSEOP_LOCAL1:
380 case PARSEOP_LOCAL2:
381 case PARSEOP_LOCAL3:
382 case PARSEOP_LOCAL4:
383 case PARSEOP_LOCAL5:
384 case PARSEOP_LOCAL6:
385 case PARSEOP_LOCAL7:
386
387 if (!MethodInfo)
388 {
389 /*
390 * Local was used outside a control method, or there was an error
391 * in the method declaration.
392 */
393 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
394 Op, Op->Asl.ExternalName);
395 return (AE_ERROR);
396 }
397
398 RegisterNumber = (Op->Asl.AmlOpcode & 0x0007);
399
400 /*
401 * If the local is being used as a target, mark the local
402 * initialized
403 */
404 if (Op->Asl.CompileFlags & OP_IS_TARGET)
405 {
406 MethodInfo->LocalInitialized[RegisterNumber] = TRUE;
407 }
408
409 /*
410 * Otherwise, this is a reference, check if the local
411 * has been previously initialized.
412 *
413 * The only operator that accepts an uninitialized value is ObjectType()
414 */
415 else if ((!MethodInfo->LocalInitialized[RegisterNumber]) &&
416 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
417 {
418 LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30);
419 AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName);
420 }
421 break;
422
423 case PARSEOP_ARG0:
424 case PARSEOP_ARG1:
425 case PARSEOP_ARG2:
426 case PARSEOP_ARG3:
427 case PARSEOP_ARG4:
428 case PARSEOP_ARG5:
429 case PARSEOP_ARG6:
430
431 if (!MethodInfo)
432 {
433 /*
434 * Arg was used outside a control method, or there was an error
435 * in the method declaration.
436 */
437 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD,
438 Op, Op->Asl.ExternalName);
439 return (AE_ERROR);
440 }
441
442 RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8;
443 ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30);
444
445 /*
446 * If the Arg is being used as a target, mark the local
447 * initialized
448 */
449 if (Op->Asl.CompileFlags & OP_IS_TARGET)
450 {
451 MethodInfo->ArgInitialized[RegisterNumber] = TRUE;
452 }
453
454 /*
455 * Otherwise, this is a reference, check if the Arg
456 * has been previously initialized.
457 *
458 * The only operator that accepts an uninitialized value is ObjectType()
459 */
460 else if ((!MethodInfo->ArgInitialized[RegisterNumber]) &&
461 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE))
462 {
463 AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName);
464 }
465
466 /* Flag this arg if it is not a "real" argument to the method */
467
468 if (RegisterNumber >= MethodInfo->NumArguments)
469 {
470 AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName);
471 }
472 break;
473
474 case PARSEOP_RETURN:
475
476 if (!MethodInfo)
477 {
478 /*
479 * Probably was an error in the method declaration,
480 * no additional error here
481 */
482 ACPI_WARNING ((AE_INFO, "%p, No parent method", Op));
483 return (AE_ERROR);
484 }
485
486 /*
487 * A child indicates a possible return value. A simple Return or
488 * Return() is marked with OP_IS_NULL_RETURN by the parser so
489 * that it is not counted as a "real" return-with-value, although
490 * the AML code that is actually emitted is Return(0). The AML
491 * definition of Return has a required parameter, so we are
492 * forced to convert a null return to Return(0).
493 */
494 if ((Op->Asl.Child) &&
495 (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) &&
496 (!(Op->Asl.Child->Asl.CompileFlags & OP_IS_NULL_RETURN)))
497 {
498 MethodInfo->NumReturnWithValue++;
499 }
500 else
501 {
502 MethodInfo->NumReturnNoValue++;
503 }
504 break;
505
506 case PARSEOP_BREAK:
507 case PARSEOP_CONTINUE:
508
509 Next = Op->Asl.Parent;
510 while (Next)
511 {
512 if (Next->Asl.ParseOpcode == PARSEOP_WHILE)
513 {
514 break;
515 }
516 Next = Next->Asl.Parent;
517 }
518
519 if (!Next)
520 {
521 AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL);
522 }
523 break;
524
525 case PARSEOP_STALL:
526
527 /* We can range check if the argument is an integer */
528
529 if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) &&
530 (Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX))
531 {
532 AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL);
533 }
534 break;
535
536 case PARSEOP_DEVICE:
537
538 if (!ApFindNameInDeviceTree (METHOD_NAME__HID, Op) &&
539 !ApFindNameInDeviceTree (METHOD_NAME__ADR, Op))
540 {
541 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op,
542 "Device object requires a _HID or _ADR in same scope");
543 }
544 break;
545
546 case PARSEOP_EVENT:
547 case PARSEOP_MUTEX:
548 case PARSEOP_OPERATIONREGION:
549 case PARSEOP_POWERRESOURCE:
550 case PARSEOP_PROCESSOR:
551 case PARSEOP_THERMALZONE:
552
553 /*
554 * The first operand is a name to be created in the namespace.
555 * Check against the reserved list.
556 */
557 i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg);
558 if (i < ACPI_VALID_RESERVED_NAME_MAX)
559 {
560 AslError (ASL_ERROR, ASL_MSG_RESERVED_USE,
561 Op, Op->Asl.ExternalName);
562 }
563 break;
564
565 case PARSEOP_NAME:
566
567 /* Typecheck any predefined names statically defined with Name() */
568
569 ApCheckForPredefinedObject (Op, Op->Asl.NameSeg);
570
571 /* Special typechecking for _HID */
572
573 if (!strcmp (METHOD_NAME__HID, Op->Asl.NameSeg))
574 {
575 Next = Op->Asl.Child->Asl.Next;
576 AnCheckId (Next, ASL_TYPE_HID);
577 }
578
579 /* Special typechecking for _CID */
580
581 else if (!strcmp (METHOD_NAME__CID, Op->Asl.NameSeg))
582 {
583 Next = Op->Asl.Child->Asl.Next;
584
585 if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) ||
586 (Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE))
587 {
588 Next = Next->Asl.Child;
589 while (Next)
590 {
591 AnCheckId (Next, ASL_TYPE_CID);
592 Next = Next->Asl.Next;
593 }
594 }
595 else
596 {
597 AnCheckId (Next, ASL_TYPE_CID);
598 }
599 }
600
601 break;
602
603 default:
604
605 break;
606 }
607
608 /* Check for named object creation within a non-serialized method */
609
610 MtCheckNamedObjectInMethod (Op, MethodInfo);
611 return (AE_OK);
612 }
613
614
615 /*******************************************************************************
616 *
617 * FUNCTION: MtCheckNamedObjectInMethod
618 *
619 * PARAMETERS: Op - Current parser op
620 * MethodInfo - Info for method being parsed
621 *
622 * RETURN: None
623 *
624 * DESCRIPTION: Detect if a non-serialized method is creating a named object,
625 * which could possibly cause problems if two threads execute
626 * the method concurrently. Emit a remark in this case.
627 *
628 ******************************************************************************/
629
630 static void
MtCheckNamedObjectInMethod(ACPI_PARSE_OBJECT * Op,ASL_METHOD_INFO * MethodInfo)631 MtCheckNamedObjectInMethod (
632 ACPI_PARSE_OBJECT *Op,
633 ASL_METHOD_INFO *MethodInfo)
634 {
635 const ACPI_OPCODE_INFO *OpInfo;
636
637
638 /* We don't care about actual method declarations or scopes */
639
640 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) ||
641 (Op->Asl.AmlOpcode == AML_SCOPE_OP))
642 {
643 return;
644 }
645
646 /* Determine if we are creating a named object within a method */
647
648 if (!MethodInfo)
649 {
650 return;
651 }
652
653 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
654 if (OpInfo->Class == AML_CLASS_NAMED_OBJECT)
655 {
656 /*
657 * 1) Mark the method as a method that creates named objects.
658 *
659 * 2) If the method is non-serialized, emit a remark that the method
660 * should be serialized.
661 *
662 * Reason: If a thread blocks within the method for any reason, and
663 * another thread enters the method, the method will fail because
664 * an attempt will be made to create the same object twice.
665 */
666 MethodInfo->CreatesNamedObjects = TRUE;
667 if (!MethodInfo->ShouldBeSerialized)
668 {
669 AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op,
670 "due to creation of named objects within");
671
672 /* Emit message only ONCE per method */
673
674 MethodInfo->ShouldBeSerialized = TRUE;
675 }
676 }
677 }
678
679
680 /*******************************************************************************
681 *
682 * FUNCTION: MtMethodAnalysisWalkEnd
683 *
684 * PARAMETERS: ASL_WALK_CALLBACK
685 *
686 * RETURN: Status
687 *
688 * DESCRIPTION: Ascending callback for analysis walk. Complete method
689 * return analysis.
690 *
691 ******************************************************************************/
692
693 ACPI_STATUS
MtMethodAnalysisWalkEnd(ACPI_PARSE_OBJECT * Op,UINT32 Level,void * Context)694 MtMethodAnalysisWalkEnd (
695 ACPI_PARSE_OBJECT *Op,
696 UINT32 Level,
697 void *Context)
698 {
699 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context;
700 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack;
701
702
703 switch (Op->Asl.ParseOpcode)
704 {
705 case PARSEOP_METHOD:
706 case PARSEOP_RETURN:
707
708 if (!MethodInfo)
709 {
710 printf ("No method info for method! [%s]\n", Op->Asl.Namepath);
711 AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op,
712 "No method info for this method");
713
714 CmCleanupAndExit ();
715 return (AE_AML_INTERNAL);
716 }
717 break;
718
719 default:
720
721 break;
722 }
723
724 switch (Op->Asl.ParseOpcode)
725 {
726 case PARSEOP_METHOD:
727
728 WalkInfo->MethodStack = MethodInfo->Next;
729
730 /*
731 * Check if there is no return statement at the end of the
732 * method AND we can actually get there -- i.e., the execution
733 * of the method can possibly terminate without a return statement.
734 */
735 if ((!AnLastStatementIsReturn (Op)) &&
736 (!(Op->Asl.CompileFlags & OP_HAS_NO_EXIT)))
737 {
738 /*
739 * No return statement, and execution can possibly exit
740 * via this path. This is equivalent to Return ()
741 */
742 MethodInfo->NumReturnNoValue++;
743 }
744
745 /*
746 * Check for case where some return statements have a return value
747 * and some do not. Exit without a return statement is a return with
748 * no value
749 */
750 if (MethodInfo->NumReturnNoValue &&
751 MethodInfo->NumReturnWithValue)
752 {
753 AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op,
754 Op->Asl.ExternalName);
755 }
756
757 /*
758 * If there are any RETURN() statements with no value, or there is a
759 * control path that allows the method to exit without a return value,
760 * we mark the method as a method that does not return a value. This
761 * knowledge can be used to check method invocations that expect a
762 * returned value.
763 */
764 if (MethodInfo->NumReturnNoValue)
765 {
766 if (MethodInfo->NumReturnWithValue)
767 {
768 Op->Asl.CompileFlags |= OP_METHOD_SOME_NO_RETVAL;
769 }
770 else
771 {
772 Op->Asl.CompileFlags |= OP_METHOD_NO_RETVAL;
773 }
774 }
775
776 /*
777 * Check predefined method names for correct return behavior
778 * and correct number of arguments. Also, some special checks
779 * For GPE and _REG methods.
780 */
781 if (ApCheckForPredefinedMethod (Op, MethodInfo))
782 {
783 /* Special check for two names like _L01 and _E01 in same scope */
784
785 ApCheckForGpeNameConflict (Op);
786
787 /*
788 * Special check for _REG: Must have an operation region definition
789 * within the same scope!
790 */
791 ApCheckRegMethod (Op);
792 }
793
794 ACPI_FREE (MethodInfo);
795 break;
796
797 case PARSEOP_NAME:
798
799 /* Special check for two names like _L01 and _E01 in same scope */
800
801 ApCheckForGpeNameConflict (Op);
802 break;
803
804 case PARSEOP_RETURN:
805
806 /*
807 * If the parent is a predefined method name, attempt to typecheck
808 * the return value. Only static types can be validated.
809 */
810 ApCheckPredefinedReturnValue (Op, MethodInfo);
811
812 /*
813 * The parent block does not "exit" and continue execution -- the
814 * method is terminated here with the Return() statement.
815 */
816 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
817
818 /* Used in the "typing" pass later */
819
820 Op->Asl.ParentMethod = MethodInfo->Op;
821
822 /*
823 * If there is a peer node after the return statement, then this
824 * node is unreachable code -- i.e., it won't be executed because of
825 * the preceding Return() statement.
826 */
827 if (Op->Asl.Next)
828 {
829 AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE,
830 Op->Asl.Next, NULL);
831 }
832 break;
833
834 case PARSEOP_IF:
835
836 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
837 (Op->Asl.Next) &&
838 (Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE))
839 {
840 /*
841 * This IF has a corresponding ELSE. The IF block has no exit,
842 * (it contains an unconditional Return)
843 * mark the ELSE block to remember this fact.
844 */
845 Op->Asl.Next->Asl.CompileFlags |= OP_IF_HAS_NO_EXIT;
846 }
847 break;
848
849 case PARSEOP_ELSE:
850
851 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
852 (Op->Asl.CompileFlags & OP_IF_HAS_NO_EXIT))
853 {
854 /*
855 * This ELSE block has no exit and the corresponding IF block
856 * has no exit either. Therefore, the parent node has no exit.
857 */
858 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
859 }
860 break;
861
862
863 default:
864
865 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) &&
866 (Op->Asl.Parent))
867 {
868 /* If this node has no exit, then the parent has no exit either */
869
870 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT;
871 }
872 break;
873 }
874
875 return (AE_OK);
876 }
877