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 - 2020, 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 "acnamesp.h" 155 #include "acparser.h" 156 #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 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; 208 209 210 /* Build cross-reference output file if requested */ 211 212 if (AslGbl_CrossReferenceOutput) 213 { 214 OtXrefWalkPart1 (Op, Level, MethodInfo); 215 } 216 217 switch (Op->Asl.ParseOpcode) 218 { 219 case PARSEOP_METHOD: 220 221 AslGbl_TotalMethods++; 222 223 /* Create and init method info */ 224 225 MethodInfo = UtLocalCalloc (sizeof (ASL_METHOD_INFO)); 226 MethodInfo->Next = WalkInfo->MethodStack; 227 MethodInfo->Op = Op; 228 229 WalkInfo->MethodStack = MethodInfo; 230 231 /* 232 * Special handling for _PSx methods. Dependency rules (same scope): 233 * 234 * 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3 235 * 2) _PS1/_PS2/_PS3: A _PS0 must exist 236 */ 237 if (ACPI_COMPARE_NAMESEG (METHOD_NAME__PS0, Op->Asl.NameSeg)) 238 { 239 /* For _PS0, one of _PS1/_PS2/_PS3 must exist */ 240 241 if ((!ApFindNameInScope (METHOD_NAME__PS1, Op)) && 242 (!ApFindNameInScope (METHOD_NAME__PS2, Op)) && 243 (!ApFindNameInScope (METHOD_NAME__PS3, Op))) 244 { 245 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op, 246 "_PS0 requires one of _PS1/_PS2/_PS3 in same scope"); 247 } 248 } 249 else if ( 250 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS1, Op->Asl.NameSeg) || 251 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS2, Op->Asl.NameSeg) || 252 ACPI_COMPARE_NAMESEG (METHOD_NAME__PS3, Op->Asl.NameSeg)) 253 { 254 /* For _PS1/_PS2/_PS3, a _PS0 must exist */ 255 256 if (!ApFindNameInScope (METHOD_NAME__PS0, Op)) 257 { 258 sprintf (AslGbl_MsgBuffer, 259 "%4.4s requires _PS0 in same scope", Op->Asl.NameSeg); 260 261 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op, 262 AslGbl_MsgBuffer); 263 } 264 } 265 266 /* Get the name node */ 267 268 Next = Op->Asl.Child; 269 270 /* Get the NumArguments node */ 271 272 Next = Next->Asl.Next; 273 MethodInfo->NumArguments = (UINT8) 274 (((UINT8) Next->Asl.Value.Integer) & 0x07); 275 276 /* Get the SerializeRule and SyncLevel nodes, ignored here */ 277 278 Next = Next->Asl.Next; 279 MethodInfo->ShouldBeSerialized = (UINT8) Next->Asl.Value.Integer; 280 281 Next = Next->Asl.Next; 282 ArgNode = Next; 283 284 /* Get the ReturnType node */ 285 286 Next = Next->Asl.Next; 287 288 NextType = Next->Asl.Child; 289 290 MethodInfo->ValidReturnTypes = MtProcessTypeOp (NextType); 291 292 /* Get the ParameterType node */ 293 294 Next = Next->Asl.Next; 295 296 NextType = Next->Asl.Child; 297 if (!NextType) 298 { 299 /* 300 * The optional parameter types list was omitted at the source 301 * level. Use the Argument count parameter instead. 302 */ 303 ActualArgs = MethodInfo->NumArguments; 304 } 305 else 306 { 307 ActualArgs = MtProcessParameterTypeList (NextType, 308 MethodInfo->ValidArgTypes); 309 MethodInfo->NumArguments = ActualArgs; 310 ArgNode->Asl.Value.Integer |= ActualArgs; 311 } 312 313 if ((MethodInfo->NumArguments) && 314 (MethodInfo->NumArguments != ActualArgs)) 315 { 316 sprintf (AslGbl_MsgBuffer, 317 "Length = %u", ActualArgs); 318 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_MISMATCH, 319 Op->Asl.Child->Asl.Next, AslGbl_MsgBuffer); 320 } 321 322 /* Allow numarguments == 0 for Function() */ 323 324 if ((!MethodInfo->NumArguments) && (ActualArgs)) 325 { 326 MethodInfo->NumArguments = ActualArgs; 327 ArgNode->Asl.Value.Integer |= ActualArgs; 328 } 329 330 /* 331 * Actual arguments are initialized at method entry. 332 * All other ArgX "registers" can be used as locals, so we 333 * track their initialization. 334 */ 335 for (i = 0; i < MethodInfo->NumArguments; i++) 336 { 337 MethodInfo->ArgInitialized[i] = TRUE; 338 } 339 break; 340 341 case PARSEOP_METHODCALL: 342 343 /* Check for a recursive method call */ 344 345 if (MethodInfo && 346 (Op->Asl.Node == MethodInfo->Op->Asl.Node)) 347 { 348 if (MethodInfo->CreatesNamedObjects) 349 { 350 /* 351 * This is an error, as it will fail at runtime on all ACPI 352 * implementations. Any named object declarations will be 353 * executed twice, causing failure the second time. Note, 354 * this is independent of whether the method is declared 355 * Serialized, because the same thread is attempting to 356 * reenter the method, and this will always succeed. 357 */ 358 AslDualParseOpError (ASL_ERROR, ASL_MSG_ILLEGAL_RECURSION, Op, 359 Op->Asl.Value.String, ASL_MSG_FOUND_HERE, MethodInfo->Op, 360 MethodInfo->Op->Asl.ExternalName); 361 } 362 else 363 { 364 /* Method does not create objects, issue a remark */ 365 366 AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName); 367 } 368 } 369 break; 370 371 case PARSEOP_LOCAL0: 372 case PARSEOP_LOCAL1: 373 case PARSEOP_LOCAL2: 374 case PARSEOP_LOCAL3: 375 case PARSEOP_LOCAL4: 376 case PARSEOP_LOCAL5: 377 case PARSEOP_LOCAL6: 378 case PARSEOP_LOCAL7: 379 380 if (!MethodInfo) 381 { 382 /* 383 * Local was used outside a control method, or there was an error 384 * in the method declaration. 385 */ 386 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, 387 Op, Op->Asl.ExternalName); 388 return (AE_ERROR); 389 } 390 391 RegisterNumber = (Op->Asl.AmlOpcode & 0x0007); 392 393 /* 394 * If the local is being used as a target, mark the local 395 * initialized 396 */ 397 if (Op->Asl.CompileFlags & OP_IS_TARGET) 398 { 399 MethodInfo->LocalInitialized[RegisterNumber] = TRUE; 400 } 401 402 /* 403 * Otherwise, this is a reference, check if the local 404 * has been previously initialized. 405 * 406 * The only operator that accepts an uninitialized value is ObjectType() 407 */ 408 else if ((!MethodInfo->LocalInitialized[RegisterNumber]) && 409 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE)) 410 { 411 LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30); 412 AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName); 413 } 414 break; 415 416 case PARSEOP_ARG0: 417 case PARSEOP_ARG1: 418 case PARSEOP_ARG2: 419 case PARSEOP_ARG3: 420 case PARSEOP_ARG4: 421 case PARSEOP_ARG5: 422 case PARSEOP_ARG6: 423 424 if (!MethodInfo) 425 { 426 /* 427 * Arg was used outside a control method, or there was an error 428 * in the method declaration. 429 */ 430 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, 431 Op, Op->Asl.ExternalName); 432 return (AE_ERROR); 433 } 434 435 RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8; 436 ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30); 437 438 /* 439 * If the Arg is being used as a target, mark the local 440 * initialized 441 */ 442 if (Op->Asl.CompileFlags & OP_IS_TARGET) 443 { 444 MethodInfo->ArgInitialized[RegisterNumber] = TRUE; 445 } 446 447 /* 448 * Otherwise, this is a reference, check if the Arg 449 * has been previously initialized. 450 * 451 * The only operator that accepts an uninitialized value is ObjectType() 452 */ 453 else if ((!MethodInfo->ArgInitialized[RegisterNumber]) && 454 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE)) 455 { 456 AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName); 457 } 458 459 /* Flag this arg if it is not a "real" argument to the method */ 460 461 if (RegisterNumber >= MethodInfo->NumArguments) 462 { 463 AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName); 464 } 465 break; 466 467 case PARSEOP_RETURN: 468 469 if (!MethodInfo) 470 { 471 /* 472 * Probably was an error in the method declaration, 473 * no additional error here 474 */ 475 ACPI_WARNING ((AE_INFO, "%p, No parent method", Op)); 476 return (AE_ERROR); 477 } 478 479 /* 480 * A child indicates a possible return value. A simple Return or 481 * Return() is marked with OP_IS_NULL_RETURN by the parser so 482 * that it is not counted as a "real" return-with-value, although 483 * the AML code that is actually emitted is Return(0). The AML 484 * definition of Return has a required parameter, so we are 485 * forced to convert a null return to Return(0). 486 */ 487 if ((Op->Asl.Child) && 488 (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) && 489 (!(Op->Asl.Child->Asl.CompileFlags & OP_IS_NULL_RETURN))) 490 { 491 MethodInfo->NumReturnWithValue++; 492 } 493 else 494 { 495 MethodInfo->NumReturnNoValue++; 496 } 497 break; 498 499 case PARSEOP_BREAK: 500 case PARSEOP_CONTINUE: 501 502 Next = Op->Asl.Parent; 503 while (Next) 504 { 505 if (Next->Asl.ParseOpcode == PARSEOP_WHILE) 506 { 507 break; 508 } 509 Next = Next->Asl.Parent; 510 } 511 512 if (!Next) 513 { 514 AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL); 515 } 516 break; 517 518 case PARSEOP_STALL: 519 520 /* We can range check if the argument is an integer */ 521 522 if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) && 523 (Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX)) 524 { 525 AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL); 526 } 527 break; 528 529 case PARSEOP_DEVICE: 530 531 /* Check usage of _HID and _ADR objects */ 532 533 HidExists = ApFindNameInDeviceTree (METHOD_NAME__HID, Op); 534 AdrExists = ApFindNameInDeviceTree (METHOD_NAME__ADR, Op); 535 536 if (!HidExists && !AdrExists) 537 { 538 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op, 539 "Device object requires a _HID or _ADR in same scope"); 540 } 541 else if (HidExists && AdrExists) 542 { 543 /* 544 * According to the ACPI spec, "A device object must contain 545 * either an _HID object or an _ADR object, but should not contain 546 * both". 547 */ 548 AslError (ASL_WARNING, ASL_MSG_MULTIPLE_TYPES, Op, 549 "Device object requires either a _HID or _ADR, but not both"); 550 } 551 break; 552 553 case PARSEOP_EVENT: 554 case PARSEOP_MUTEX: 555 case PARSEOP_OPERATIONREGION: 556 case PARSEOP_POWERRESOURCE: 557 case PARSEOP_PROCESSOR: 558 case PARSEOP_THERMALZONE: 559 560 /* 561 * The first operand is a name to be created in the namespace. 562 * Check against the reserved list. 563 */ 564 i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg); 565 if (i < ACPI_VALID_RESERVED_NAME_MAX) 566 { 567 AslError (ASL_ERROR, ASL_MSG_RESERVED_USE, 568 Op, Op->Asl.ExternalName); 569 } 570 571 MtCheckStaticOperationRegionInMethod (Op); 572 break; 573 574 case PARSEOP_NAME: 575 576 /* Typecheck any predefined names statically defined with Name() */ 577 578 ApCheckForPredefinedObject (Op, Op->Asl.NameSeg); 579 580 /* Special typechecking for _HID */ 581 582 if (ACPI_COMPARE_NAMESEG (METHOD_NAME__HID, Op->Asl.NameSeg)) 583 { 584 Next = Op->Asl.Child->Asl.Next; 585 AnCheckId (Next, ASL_TYPE_HID); 586 } 587 588 /* Special typechecking for _CID */ 589 590 else if (ACPI_COMPARE_NAMESEG (METHOD_NAME__CID, Op->Asl.NameSeg)) 591 { 592 Next = Op->Asl.Child->Asl.Next; 593 594 if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) || 595 (Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE)) 596 { 597 Next = Next->Asl.Child; 598 while (Next) 599 { 600 AnCheckId (Next, ASL_TYPE_CID); 601 Next = Next->Asl.Next; 602 } 603 } 604 else 605 { 606 AnCheckId (Next, ASL_TYPE_CID); 607 } 608 } 609 610 break; 611 612 default: 613 614 break; 615 } 616 617 /* Check for named object creation within a non-serialized method */ 618 619 MtCheckNamedObjectInMethod (Op, MethodInfo); 620 return (AE_OK); 621 } 622 623 624 /******************************************************************************* 625 * 626 * FUNCTION: MtProcessTypeOp 627 * 628 * PARAMETERS: Op - Op representing a btype 629 * 630 * RETURN: Btype represented by Op 631 * 632 * DESCRIPTION: Process a parse object that represents single parameter type or 633 * a return type in method, function, and external declarations. 634 * 635 ******************************************************************************/ 636 637 UINT32 638 MtProcessTypeOp ( 639 ACPI_PARSE_OBJECT *TypeOp) 640 { 641 UINT32 Btype = ACPI_BTYPE_ANY; 642 643 644 while (TypeOp) 645 { 646 Btype |= AnMapObjTypeToBtype (TypeOp); 647 TypeOp->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG; 648 TypeOp = TypeOp->Asl.Next; 649 } 650 651 return (Btype); 652 } 653 654 655 /******************************************************************************* 656 * 657 * FUNCTION: MtProcessParameterTypeList 658 * 659 * PARAMETERS: Op - Op representing a btype 660 * 661 * RETURN: Btype represented by Op 662 * 663 * DESCRIPTION: Process a parse object that represents a parameter type list in 664 * method, function, and external declarations. 665 * 666 ******************************************************************************/ 667 668 UINT8 669 MtProcessParameterTypeList ( 670 ACPI_PARSE_OBJECT *ParamTypeOp, 671 UINT32 *TypeList) 672 { 673 UINT8 ParameterCount = 0; 674 675 676 if (ParamTypeOp && ParamTypeOp->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) 677 { 678 /* Special case for a single parameter without braces */ 679 680 TypeList[ParameterCount] = 681 MtProcessTypeOp (ParamTypeOp); 682 683 return (1); 684 } 685 686 while (ParamTypeOp) 687 { 688 TypeList[ParameterCount] = 689 MtProcessTypeOp (ParamTypeOp->Asl.Child); 690 691 ParameterCount++; 692 ParamTypeOp = ParamTypeOp->Asl.Next; 693 } 694 695 return (ParameterCount); 696 } 697 698 699 /******************************************************************************* 700 * 701 * FUNCTION: MtCheckNamedObjectInMethod 702 * 703 * PARAMETERS: Op - Current parser op 704 * MethodInfo - Info for method being parsed 705 * 706 * RETURN: None 707 * 708 * DESCRIPTION: Detect if a non-serialized method is creating a named object, 709 * which could possibly cause problems if two threads execute 710 * the method concurrently. Emit a remark in this case. 711 * 712 ******************************************************************************/ 713 714 static void 715 MtCheckNamedObjectInMethod ( 716 ACPI_PARSE_OBJECT *Op, 717 ASL_METHOD_INFO *MethodInfo) 718 { 719 const ACPI_OPCODE_INFO *OpInfo; 720 char *ExternalPath; 721 722 723 /* We don't care about actual method declarations or scopes */ 724 725 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) || 726 (Op->Asl.AmlOpcode == AML_SCOPE_OP)) 727 { 728 return; 729 } 730 731 /* Determine if we are creating a named object within a method */ 732 733 if (!MethodInfo) 734 { 735 return; 736 } 737 738 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 739 if ((OpInfo->Class == AML_CLASS_NAMED_OBJECT) && (Op->Asl.AmlOpcode != AML_FIELD_OP)) 740 { 741 /* 742 * 1) Mark the method as a method that creates named objects. 743 * 744 * 2) Issue a remark indicating the inefficiency of creating named 745 * objects within a method (Except for compiler-emitted temporary 746 * variables). 747 * 748 * 3) If the method is non-serialized, emit a remark that the method 749 * should be serialized. 750 * 751 * Reason: If a thread blocks within the method for any reason, and 752 * another thread enters the method, the method will fail because 753 * an attempt will be made to create the same object twice. 754 * 755 * Note: The Field opcode is disallowed here because Field() does not 756 * create a new named object. 757 */ 758 ExternalPath = AcpiNsGetNormalizedPathname (MethodInfo->Op->Asl.Node, TRUE); 759 760 /* No error for compiler temp variables (name starts with "_T_") */ 761 762 if ((Op->Asl.NameSeg[0] != '_') && 763 (Op->Asl.NameSeg[1] != 'T') && 764 (Op->Asl.NameSeg[2] != '_')) 765 { 766 AslError (ASL_REMARK, ASL_MSG_NAMED_OBJECT_CREATION, Op, 767 ExternalPath); 768 } 769 770 MethodInfo->CreatesNamedObjects = TRUE; 771 if (!MethodInfo->ShouldBeSerialized) 772 { 773 AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op, 774 ExternalPath); 775 776 /* Emit message only ONCE per method */ 777 778 MethodInfo->ShouldBeSerialized = TRUE; 779 } 780 781 if (ExternalPath) 782 { 783 ACPI_FREE (ExternalPath); 784 } 785 } 786 } 787 788 789 /******************************************************************************* 790 * 791 * FUNCTION: MtCheckStaticOperationRegionInMethod 792 * 793 * PARAMETERS: Op - Current parser op 794 * 795 * RETURN: None 796 * 797 * DESCRIPTION: Warns if an Operation Region with static address or length 798 * is declared inside a control method 799 * 800 ******************************************************************************/ 801 802 static void 803 MtCheckStaticOperationRegionInMethod( 804 ACPI_PARSE_OBJECT* Op) 805 { 806 ACPI_PARSE_OBJECT* AddressOp; 807 ACPI_PARSE_OBJECT* LengthOp; 808 809 810 if (Op->Asl.ParseOpcode != PARSEOP_OPERATIONREGION) 811 { 812 return; 813 } 814 815 /* 816 * OperationRegion should have 4 arguments defined. At this point, we 817 * assume that the parse tree is well-formed. 818 */ 819 AddressOp = Op->Asl.Child->Asl.Next->Asl.Next; 820 LengthOp = Op->Asl.Child->Asl.Next->Asl.Next->Asl.Next; 821 822 if (UtGetParentMethodOp (Op) && 823 AddressOp->Asl.ParseOpcode == PARSEOP_INTEGER && 824 LengthOp->Asl.ParseOpcode == PARSEOP_INTEGER) 825 { 826 /* 827 * At this point, a static operation region declared inside of a 828 * control method has been found. Throw a warning because this is 829 * highly inefficient. 830 */ 831 AslError(ASL_WARNING, ASL_MSG_STATIC_OPREGION_IN_METHOD, Op, NULL); 832 } 833 834 return; 835 } 836 837 838 /******************************************************************************* 839 * 840 * FUNCTION: MtMethodAnalysisWalkEnd 841 * 842 * PARAMETERS: ASL_WALK_CALLBACK 843 * 844 * RETURN: Status 845 * 846 * DESCRIPTION: Ascending callback for analysis walk. Complete method 847 * return analysis. 848 * 849 ******************************************************************************/ 850 851 ACPI_STATUS 852 MtMethodAnalysisWalkEnd ( 853 ACPI_PARSE_OBJECT *Op, 854 UINT32 Level, 855 void *Context) 856 { 857 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context; 858 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack; 859 char *ExternalPath; 860 861 862 switch (Op->Asl.ParseOpcode) 863 { 864 case PARSEOP_METHOD: 865 case PARSEOP_RETURN: 866 867 if (!MethodInfo) 868 { 869 printf ("No method info for method! [%s]\n", Op->Asl.Namepath); 870 AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op, 871 "No method info for this method"); 872 873 CmCleanupAndExit (); 874 return (AE_AML_INTERNAL); 875 } 876 break; 877 878 default: 879 880 break; 881 } 882 883 switch (Op->Asl.ParseOpcode) 884 { 885 case PARSEOP_METHOD: 886 887 WalkInfo->MethodStack = MethodInfo->Next; 888 889 /* 890 * Check if there is no return statement at the end of the 891 * method AND we can actually get there -- i.e., the execution 892 * of the method can possibly terminate without a return statement. 893 */ 894 if ((!AnLastStatementIsReturn (Op)) && 895 (!(Op->Asl.CompileFlags & OP_HAS_NO_EXIT))) 896 { 897 /* 898 * No return statement, and execution can possibly exit 899 * via this path. This is equivalent to Return () 900 */ 901 MethodInfo->NumReturnNoValue++; 902 } 903 904 /* 905 * Check for case where some return statements have a return value 906 * and some do not. Exit without a return statement is a return with 907 * no value 908 */ 909 if (MethodInfo->NumReturnNoValue && 910 MethodInfo->NumReturnWithValue) 911 { 912 ExternalPath = AcpiNsGetNormalizedPathname (Op->Asl.Node, TRUE); 913 914 AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op, 915 ExternalPath); 916 917 if (ExternalPath) 918 { 919 ACPI_FREE (ExternalPath); 920 } 921 } 922 923 /* 924 * If there are any RETURN() statements with no value, or there is a 925 * control path that allows the method to exit without a return value, 926 * we mark the method as a method that does not return a value. This 927 * knowledge can be used to check method invocations that expect a 928 * returned value. 929 */ 930 if (MethodInfo->NumReturnNoValue) 931 { 932 if (MethodInfo->NumReturnWithValue) 933 { 934 Op->Asl.CompileFlags |= OP_METHOD_SOME_NO_RETVAL; 935 } 936 else 937 { 938 Op->Asl.CompileFlags |= OP_METHOD_NO_RETVAL; 939 } 940 } 941 942 /* 943 * Check predefined method names for correct return behavior 944 * and correct number of arguments. Also, some special checks 945 * For GPE and _REG methods. 946 */ 947 if (ApCheckForPredefinedMethod (Op, MethodInfo)) 948 { 949 /* Special check for two names like _L01 and _E01 in same scope */ 950 951 ApCheckForGpeNameConflict (Op); 952 953 /* 954 * Special check for _REG: Must have an operation region definition 955 * within the same scope! 956 */ 957 ApCheckRegMethod (Op); 958 } 959 960 ACPI_FREE (MethodInfo); 961 break; 962 963 case PARSEOP_NAME: 964 965 /* Special check for two names like _L01 and _E01 in same scope */ 966 967 ApCheckForGpeNameConflict (Op); 968 break; 969 970 case PARSEOP_RETURN: 971 972 /* 973 * If the parent is a predefined method name, attempt to typecheck 974 * the return value. Only static types can be validated. 975 */ 976 ApCheckPredefinedReturnValue (Op, MethodInfo); 977 978 /* 979 * The parent block does not "exit" and continue execution -- the 980 * method is terminated here with the Return() statement. 981 */ 982 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT; 983 984 /* Used in the "typing" pass later */ 985 986 Op->Asl.ParentMethod = MethodInfo->Op; 987 988 /* 989 * If there is a peer node after the return statement, then this 990 * node is unreachable code -- i.e., it won't be executed because of 991 * the preceding Return() statement. 992 */ 993 if (Op->Asl.Next) 994 { 995 AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE, 996 Op->Asl.Next, NULL); 997 } 998 break; 999 1000 case PARSEOP_IF: 1001 1002 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) && 1003 (Op->Asl.Next) && 1004 (Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE)) 1005 { 1006 /* 1007 * This IF has a corresponding ELSE. The IF block has no exit, 1008 * (it contains an unconditional Return) 1009 * mark the ELSE block to remember this fact. 1010 */ 1011 Op->Asl.Next->Asl.CompileFlags |= OP_IF_HAS_NO_EXIT; 1012 } 1013 break; 1014 1015 case PARSEOP_ELSE: 1016 1017 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) && 1018 (Op->Asl.CompileFlags & OP_IF_HAS_NO_EXIT)) 1019 { 1020 /* 1021 * This ELSE block has no exit and the corresponding IF block 1022 * has no exit either. Therefore, the parent node has no exit. 1023 */ 1024 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT; 1025 } 1026 break; 1027 1028 1029 default: 1030 1031 if ((Op->Asl.CompileFlags & OP_HAS_NO_EXIT) && 1032 (Op->Asl.Parent)) 1033 { 1034 /* If this node has no exit, then the parent has no exit either */ 1035 1036 Op->Asl.Parent->Asl.CompileFlags |= OP_HAS_NO_EXIT; 1037 } 1038 break; 1039 } 1040 1041 return (AE_OK); 1042 } 1043