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 - 2017, 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/acparser.h> 155 #include <contrib/dev/acpica/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 if (MethodInfo && 351 (Op->Asl.Node == MethodInfo->Op->Asl.Node)) 352 { 353 AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName); 354 } 355 break; 356 357 case PARSEOP_LOCAL0: 358 case PARSEOP_LOCAL1: 359 case PARSEOP_LOCAL2: 360 case PARSEOP_LOCAL3: 361 case PARSEOP_LOCAL4: 362 case PARSEOP_LOCAL5: 363 case PARSEOP_LOCAL6: 364 case PARSEOP_LOCAL7: 365 366 if (!MethodInfo) 367 { 368 /* 369 * Local was used outside a control method, or there was an error 370 * in the method declaration. 371 */ 372 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, 373 Op, Op->Asl.ExternalName); 374 return (AE_ERROR); 375 } 376 377 RegisterNumber = (Op->Asl.AmlOpcode & 0x0007); 378 379 /* 380 * If the local is being used as a target, mark the local 381 * initialized 382 */ 383 if (Op->Asl.CompileFlags & NODE_IS_TARGET) 384 { 385 MethodInfo->LocalInitialized[RegisterNumber] = TRUE; 386 } 387 388 /* 389 * Otherwise, this is a reference, check if the local 390 * has been previously initialized. 391 * 392 * The only operator that accepts an uninitialized value is ObjectType() 393 */ 394 else if ((!MethodInfo->LocalInitialized[RegisterNumber]) && 395 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE)) 396 { 397 LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30); 398 AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName); 399 } 400 break; 401 402 case PARSEOP_ARG0: 403 case PARSEOP_ARG1: 404 case PARSEOP_ARG2: 405 case PARSEOP_ARG3: 406 case PARSEOP_ARG4: 407 case PARSEOP_ARG5: 408 case PARSEOP_ARG6: 409 410 if (!MethodInfo) 411 { 412 /* 413 * Arg was used outside a control method, or there was an error 414 * in the method declaration. 415 */ 416 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, 417 Op, Op->Asl.ExternalName); 418 return (AE_ERROR); 419 } 420 421 RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8; 422 ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30); 423 424 /* 425 * If the Arg is being used as a target, mark the local 426 * initialized 427 */ 428 if (Op->Asl.CompileFlags & NODE_IS_TARGET) 429 { 430 MethodInfo->ArgInitialized[RegisterNumber] = TRUE; 431 } 432 433 /* 434 * Otherwise, this is a reference, check if the Arg 435 * has been previously initialized. 436 * 437 * The only operator that accepts an uninitialized value is ObjectType() 438 */ 439 else if ((!MethodInfo->ArgInitialized[RegisterNumber]) && 440 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE)) 441 { 442 AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName); 443 } 444 445 /* Flag this arg if it is not a "real" argument to the method */ 446 447 if (RegisterNumber >= MethodInfo->NumArguments) 448 { 449 AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName); 450 } 451 break; 452 453 case PARSEOP_RETURN: 454 455 if (!MethodInfo) 456 { 457 /* 458 * Probably was an error in the method declaration, 459 * no additional error here 460 */ 461 ACPI_WARNING ((AE_INFO, "%p, No parent method", Op)); 462 return (AE_ERROR); 463 } 464 465 /* 466 * A child indicates a possible return value. A simple Return or 467 * Return() is marked with NODE_IS_NULL_RETURN by the parser so 468 * that it is not counted as a "real" return-with-value, although 469 * the AML code that is actually emitted is Return(0). The AML 470 * definition of Return has a required parameter, so we are 471 * forced to convert a null return to Return(0). 472 */ 473 if ((Op->Asl.Child) && 474 (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) && 475 (!(Op->Asl.Child->Asl.CompileFlags & NODE_IS_NULL_RETURN))) 476 { 477 MethodInfo->NumReturnWithValue++; 478 } 479 else 480 { 481 MethodInfo->NumReturnNoValue++; 482 } 483 break; 484 485 case PARSEOP_BREAK: 486 case PARSEOP_CONTINUE: 487 488 Next = Op->Asl.Parent; 489 while (Next) 490 { 491 if (Next->Asl.ParseOpcode == PARSEOP_WHILE) 492 { 493 break; 494 } 495 Next = Next->Asl.Parent; 496 } 497 498 if (!Next) 499 { 500 AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL); 501 } 502 break; 503 504 case PARSEOP_STALL: 505 506 /* We can range check if the argument is an integer */ 507 508 if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) && 509 (Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX)) 510 { 511 AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL); 512 } 513 break; 514 515 case PARSEOP_DEVICE: 516 517 if (!ApFindNameInDeviceTree (METHOD_NAME__HID, Op) && 518 !ApFindNameInDeviceTree (METHOD_NAME__ADR, Op)) 519 { 520 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op, 521 "Device object requires a _HID or _ADR in same scope"); 522 } 523 break; 524 525 case PARSEOP_EVENT: 526 case PARSEOP_MUTEX: 527 case PARSEOP_OPERATIONREGION: 528 case PARSEOP_POWERRESOURCE: 529 case PARSEOP_PROCESSOR: 530 case PARSEOP_THERMALZONE: 531 532 /* 533 * The first operand is a name to be created in the namespace. 534 * Check against the reserved list. 535 */ 536 i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg); 537 if (i < ACPI_VALID_RESERVED_NAME_MAX) 538 { 539 AslError (ASL_ERROR, ASL_MSG_RESERVED_USE, 540 Op, Op->Asl.ExternalName); 541 } 542 break; 543 544 case PARSEOP_NAME: 545 546 /* Typecheck any predefined names statically defined with Name() */ 547 548 ApCheckForPredefinedObject (Op, Op->Asl.NameSeg); 549 550 /* Special typechecking for _HID */ 551 552 if (!strcmp (METHOD_NAME__HID, Op->Asl.NameSeg)) 553 { 554 Next = Op->Asl.Child->Asl.Next; 555 AnCheckId (Next, ASL_TYPE_HID); 556 } 557 558 /* Special typechecking for _CID */ 559 560 else if (!strcmp (METHOD_NAME__CID, Op->Asl.NameSeg)) 561 { 562 Next = Op->Asl.Child->Asl.Next; 563 564 if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) || 565 (Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE)) 566 { 567 Next = Next->Asl.Child; 568 while (Next) 569 { 570 AnCheckId (Next, ASL_TYPE_CID); 571 Next = Next->Asl.Next; 572 } 573 } 574 else 575 { 576 AnCheckId (Next, ASL_TYPE_CID); 577 } 578 } 579 580 break; 581 582 default: 583 584 break; 585 } 586 587 /* Check for named object creation within a non-serialized method */ 588 589 MtCheckNamedObjectInMethod (Op, MethodInfo); 590 return (AE_OK); 591 } 592 593 594 /******************************************************************************* 595 * 596 * FUNCTION: MtCheckNamedObjectInMethod 597 * 598 * PARAMETERS: Op - Current parser op 599 * MethodInfo - Info for method being parsed 600 * 601 * RETURN: None 602 * 603 * DESCRIPTION: Detect if a non-serialized method is creating a named object, 604 * which could possibly cause problems if two threads execute 605 * the method concurrently. Emit a remark in this case. 606 * 607 ******************************************************************************/ 608 609 static void 610 MtCheckNamedObjectInMethod ( 611 ACPI_PARSE_OBJECT *Op, 612 ASL_METHOD_INFO *MethodInfo) 613 { 614 const ACPI_OPCODE_INFO *OpInfo; 615 616 617 /* We don't care about actual method declarations or scopes */ 618 619 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) || 620 (Op->Asl.AmlOpcode == AML_SCOPE_OP)) 621 { 622 return; 623 } 624 625 /* Determine if we are creating a named object */ 626 627 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 628 if (OpInfo->Class == AML_CLASS_NAMED_OBJECT) 629 { 630 /* 631 * If we have a named object created within a non-serialized method, 632 * emit a remark that the method should be serialized. 633 * 634 * Reason: If a thread blocks within the method for any reason, and 635 * another thread enters the method, the method will fail because an 636 * attempt will be made to create the same object twice. 637 */ 638 if (MethodInfo && !MethodInfo->ShouldBeSerialized) 639 { 640 AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op, 641 "due to creation of named objects within"); 642 643 /* Emit message only ONCE per method */ 644 645 MethodInfo->ShouldBeSerialized = TRUE; 646 } 647 } 648 } 649 650 651 /******************************************************************************* 652 * 653 * FUNCTION: MtMethodAnalysisWalkEnd 654 * 655 * PARAMETERS: ASL_WALK_CALLBACK 656 * 657 * RETURN: Status 658 * 659 * DESCRIPTION: Ascending callback for analysis walk. Complete method 660 * return analysis. 661 * 662 ******************************************************************************/ 663 664 ACPI_STATUS 665 MtMethodAnalysisWalkEnd ( 666 ACPI_PARSE_OBJECT *Op, 667 UINT32 Level, 668 void *Context) 669 { 670 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context; 671 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack; 672 673 674 switch (Op->Asl.ParseOpcode) 675 { 676 case PARSEOP_METHOD: 677 case PARSEOP_RETURN: 678 679 if (!MethodInfo) 680 { 681 printf ("No method info for method! [%s]\n", Op->Asl.Namepath); 682 AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op, 683 "No method info for this method"); 684 685 CmCleanupAndExit (); 686 return (AE_AML_INTERNAL); 687 } 688 break; 689 690 default: 691 692 break; 693 } 694 695 switch (Op->Asl.ParseOpcode) 696 { 697 case PARSEOP_METHOD: 698 699 WalkInfo->MethodStack = MethodInfo->Next; 700 701 /* 702 * Check if there is no return statement at the end of the 703 * method AND we can actually get there -- i.e., the execution 704 * of the method can possibly terminate without a return statement. 705 */ 706 if ((!AnLastStatementIsReturn (Op)) && 707 (!(Op->Asl.CompileFlags & NODE_HAS_NO_EXIT))) 708 { 709 /* 710 * No return statement, and execution can possibly exit 711 * via this path. This is equivalent to Return () 712 */ 713 MethodInfo->NumReturnNoValue++; 714 } 715 716 /* 717 * Check for case where some return statements have a return value 718 * and some do not. Exit without a return statement is a return with 719 * no value 720 */ 721 if (MethodInfo->NumReturnNoValue && 722 MethodInfo->NumReturnWithValue) 723 { 724 AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op, 725 Op->Asl.ExternalName); 726 } 727 728 /* 729 * If there are any RETURN() statements with no value, or there is a 730 * control path that allows the method to exit without a return value, 731 * we mark the method as a method that does not return a value. This 732 * knowledge can be used to check method invocations that expect a 733 * returned value. 734 */ 735 if (MethodInfo->NumReturnNoValue) 736 { 737 if (MethodInfo->NumReturnWithValue) 738 { 739 Op->Asl.CompileFlags |= NODE_METHOD_SOME_NO_RETVAL; 740 } 741 else 742 { 743 Op->Asl.CompileFlags |= NODE_METHOD_NO_RETVAL; 744 } 745 } 746 747 /* 748 * Check predefined method names for correct return behavior 749 * and correct number of arguments. Also, some special checks 750 * For GPE and _REG methods. 751 */ 752 if (ApCheckForPredefinedMethod (Op, MethodInfo)) 753 { 754 /* Special check for two names like _L01 and _E01 in same scope */ 755 756 ApCheckForGpeNameConflict (Op); 757 758 /* 759 * Special check for _REG: Must have an operation region definition 760 * within the same scope! 761 */ 762 ApCheckRegMethod (Op); 763 } 764 765 ACPI_FREE (MethodInfo); 766 break; 767 768 case PARSEOP_NAME: 769 770 /* Special check for two names like _L01 and _E01 in same scope */ 771 772 ApCheckForGpeNameConflict (Op); 773 break; 774 775 case PARSEOP_RETURN: 776 777 /* 778 * If the parent is a predefined method name, attempt to typecheck 779 * the return value. Only static types can be validated. 780 */ 781 ApCheckPredefinedReturnValue (Op, MethodInfo); 782 783 /* 784 * The parent block does not "exit" and continue execution -- the 785 * method is terminated here with the Return() statement. 786 */ 787 Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT; 788 789 /* Used in the "typing" pass later */ 790 791 Op->Asl.ParentMethod = MethodInfo->Op; 792 793 /* 794 * If there is a peer node after the return statement, then this 795 * node is unreachable code -- i.e., it won't be executed because of 796 * the preceding Return() statement. 797 */ 798 if (Op->Asl.Next) 799 { 800 AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE, 801 Op->Asl.Next, NULL); 802 } 803 break; 804 805 case PARSEOP_IF: 806 807 if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) && 808 (Op->Asl.Next) && 809 (Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE)) 810 { 811 /* 812 * This IF has a corresponding ELSE. The IF block has no exit, 813 * (it contains an unconditional Return) 814 * mark the ELSE block to remember this fact. 815 */ 816 Op->Asl.Next->Asl.CompileFlags |= NODE_IF_HAS_NO_EXIT; 817 } 818 break; 819 820 case PARSEOP_ELSE: 821 822 if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) && 823 (Op->Asl.CompileFlags & NODE_IF_HAS_NO_EXIT)) 824 { 825 /* 826 * This ELSE block has no exit and the corresponding IF block 827 * has no exit either. Therefore, the parent node has no exit. 828 */ 829 Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT; 830 } 831 break; 832 833 834 default: 835 836 if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) && 837 (Op->Asl.Parent)) 838 { 839 /* If this node has no exit, then the parent has no exit either */ 840 841 Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT; 842 } 843 break; 844 } 845 846 return (AE_OK); 847 } 848