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 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 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 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