1 /****************************************************************************** 2 * 3 * Module Name: aslmethod.c - Control method analysis walk 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include <contrib/dev/acpica/compiler/aslcompiler.h> 45 #include "aslcompiler.y.h" 46 #include <contrib/dev/acpica/include/acparser.h> 47 #include <contrib/dev/acpica/include/amlcode.h> 48 49 50 #define _COMPONENT ACPI_COMPILER 51 ACPI_MODULE_NAME ("aslmethod") 52 53 54 /* Local prototypes */ 55 56 static void 57 MtCheckNamedObjectInMethod ( 58 ACPI_PARSE_OBJECT *Op, 59 ASL_METHOD_INFO *MethodInfo); 60 61 62 /******************************************************************************* 63 * 64 * FUNCTION: MtMethodAnalysisWalkBegin 65 * 66 * PARAMETERS: ASL_WALK_CALLBACK 67 * 68 * RETURN: Status 69 * 70 * DESCRIPTION: Descending callback for the analysis walk. Check methods for: 71 * 1) Initialized local variables 72 * 2) Valid arguments 73 * 3) Return types 74 * 75 ******************************************************************************/ 76 77 ACPI_STATUS 78 MtMethodAnalysisWalkBegin ( 79 ACPI_PARSE_OBJECT *Op, 80 UINT32 Level, 81 void *Context) 82 { 83 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context; 84 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack; 85 ACPI_PARSE_OBJECT *Next; 86 UINT32 RegisterNumber; 87 UINT32 i; 88 char LocalName[] = "Local0"; 89 char ArgName[] = "Arg0"; 90 ACPI_PARSE_OBJECT *ArgNode; 91 ACPI_PARSE_OBJECT *NextType; 92 ACPI_PARSE_OBJECT *NextParamType; 93 UINT8 ActualArgs = 0; 94 95 96 /* Build cross-reference output file if requested */ 97 98 if (Gbl_CrossReferenceOutput) 99 { 100 OtXrefWalkPart1 (Op, Level, MethodInfo); 101 } 102 103 switch (Op->Asl.ParseOpcode) 104 { 105 case PARSEOP_METHOD: 106 107 TotalMethods++; 108 109 /* Create and init method info */ 110 111 MethodInfo = UtLocalCalloc (sizeof (ASL_METHOD_INFO)); 112 MethodInfo->Next = WalkInfo->MethodStack; 113 MethodInfo->Op = Op; 114 115 WalkInfo->MethodStack = MethodInfo; 116 117 /* 118 * Special handling for _PSx methods. Dependency rules (same scope): 119 * 120 * 1) _PS0 - One of these must exist: _PS1, _PS2, _PS3 121 * 2) _PS1/_PS2/_PS3: A _PS0 must exist 122 */ 123 if (ACPI_COMPARE_NAME (METHOD_NAME__PS0, Op->Asl.NameSeg)) 124 { 125 /* For _PS0, one of _PS1/_PS2/_PS3 must exist */ 126 127 if ((!ApFindNameInScope (METHOD_NAME__PS1, Op)) && 128 (!ApFindNameInScope (METHOD_NAME__PS2, Op)) && 129 (!ApFindNameInScope (METHOD_NAME__PS3, Op))) 130 { 131 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op, 132 "_PS0 requires one of _PS1/_PS2/_PS3 in same scope"); 133 } 134 } 135 else if ( 136 ACPI_COMPARE_NAME (METHOD_NAME__PS1, Op->Asl.NameSeg) || 137 ACPI_COMPARE_NAME (METHOD_NAME__PS2, Op->Asl.NameSeg) || 138 ACPI_COMPARE_NAME (METHOD_NAME__PS3, Op->Asl.NameSeg)) 139 { 140 /* For _PS1/_PS2/_PS3, a _PS0 must exist */ 141 142 if (!ApFindNameInScope (METHOD_NAME__PS0, Op)) 143 { 144 sprintf (MsgBuffer, 145 "%4.4s requires _PS0 in same scope", Op->Asl.NameSeg); 146 147 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op, 148 MsgBuffer); 149 } 150 } 151 152 /* Get the name node */ 153 154 Next = Op->Asl.Child; 155 156 /* Get the NumArguments node */ 157 158 Next = Next->Asl.Next; 159 MethodInfo->NumArguments = (UINT8) 160 (((UINT8) Next->Asl.Value.Integer) & 0x07); 161 162 /* Get the SerializeRule and SyncLevel nodes, ignored here */ 163 164 Next = Next->Asl.Next; 165 MethodInfo->ShouldBeSerialized = (UINT8) Next->Asl.Value.Integer; 166 167 Next = Next->Asl.Next; 168 ArgNode = Next; 169 170 /* Get the ReturnType node */ 171 172 Next = Next->Asl.Next; 173 174 NextType = Next->Asl.Child; 175 while (NextType) 176 { 177 /* Get and map each of the ReturnTypes */ 178 179 MethodInfo->ValidReturnTypes |= AnMapObjTypeToBtype (NextType); 180 NextType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG; 181 NextType = NextType->Asl.Next; 182 } 183 184 /* Get the ParameterType node */ 185 186 Next = Next->Asl.Next; 187 188 NextType = Next->Asl.Child; 189 while (NextType) 190 { 191 if (NextType->Asl.ParseOpcode == PARSEOP_DEFAULT_ARG) 192 { 193 NextParamType = NextType->Asl.Child; 194 while (NextParamType) 195 { 196 MethodInfo->ValidArgTypes[ActualArgs] |= 197 AnMapObjTypeToBtype (NextParamType); 198 199 NextParamType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG; 200 NextParamType = NextParamType->Asl.Next; 201 } 202 } 203 else 204 { 205 MethodInfo->ValidArgTypes[ActualArgs] = 206 AnMapObjTypeToBtype (NextType); 207 208 NextType->Asl.ParseOpcode = PARSEOP_DEFAULT_ARG; 209 ActualArgs++; 210 } 211 212 NextType = NextType->Asl.Next; 213 } 214 215 if ((MethodInfo->NumArguments) && 216 (MethodInfo->NumArguments != ActualArgs)) 217 { 218 /* error: Param list did not match number of args */ 219 } 220 221 /* Allow numarguments == 0 for Function() */ 222 223 if ((!MethodInfo->NumArguments) && (ActualArgs)) 224 { 225 MethodInfo->NumArguments = ActualArgs; 226 ArgNode->Asl.Value.Integer |= ActualArgs; 227 } 228 229 /* 230 * Actual arguments are initialized at method entry. 231 * All other ArgX "registers" can be used as locals, so we 232 * track their initialization. 233 */ 234 for (i = 0; i < MethodInfo->NumArguments; i++) 235 { 236 MethodInfo->ArgInitialized[i] = TRUE; 237 } 238 break; 239 240 case PARSEOP_METHODCALL: 241 242 if (MethodInfo && 243 (Op->Asl.Node == MethodInfo->Op->Asl.Node)) 244 { 245 AslError (ASL_REMARK, ASL_MSG_RECURSION, Op, Op->Asl.ExternalName); 246 } 247 break; 248 249 case PARSEOP_LOCAL0: 250 case PARSEOP_LOCAL1: 251 case PARSEOP_LOCAL2: 252 case PARSEOP_LOCAL3: 253 case PARSEOP_LOCAL4: 254 case PARSEOP_LOCAL5: 255 case PARSEOP_LOCAL6: 256 case PARSEOP_LOCAL7: 257 258 if (!MethodInfo) 259 { 260 /* 261 * Local was used outside a control method, or there was an error 262 * in the method declaration. 263 */ 264 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, 265 Op, Op->Asl.ExternalName); 266 return (AE_ERROR); 267 } 268 269 RegisterNumber = (Op->Asl.AmlOpcode & 0x0007); 270 271 /* 272 * If the local is being used as a target, mark the local 273 * initialized 274 */ 275 if (Op->Asl.CompileFlags & NODE_IS_TARGET) 276 { 277 MethodInfo->LocalInitialized[RegisterNumber] = TRUE; 278 } 279 280 /* 281 * Otherwise, this is a reference, check if the local 282 * has been previously initialized. 283 * 284 * The only operator that accepts an uninitialized value is ObjectType() 285 */ 286 else if ((!MethodInfo->LocalInitialized[RegisterNumber]) && 287 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE)) 288 { 289 LocalName[strlen (LocalName) -1] = (char) (RegisterNumber + 0x30); 290 AslError (ASL_ERROR, ASL_MSG_LOCAL_INIT, Op, LocalName); 291 } 292 break; 293 294 case PARSEOP_ARG0: 295 case PARSEOP_ARG1: 296 case PARSEOP_ARG2: 297 case PARSEOP_ARG3: 298 case PARSEOP_ARG4: 299 case PARSEOP_ARG5: 300 case PARSEOP_ARG6: 301 302 if (!MethodInfo) 303 { 304 /* 305 * Arg was used outside a control method, or there was an error 306 * in the method declaration. 307 */ 308 AslError (ASL_REMARK, ASL_MSG_LOCAL_OUTSIDE_METHOD, 309 Op, Op->Asl.ExternalName); 310 return (AE_ERROR); 311 } 312 313 RegisterNumber = (Op->Asl.AmlOpcode & 0x000F) - 8; 314 ArgName[strlen (ArgName) -1] = (char) (RegisterNumber + 0x30); 315 316 /* 317 * If the Arg is being used as a target, mark the local 318 * initialized 319 */ 320 if (Op->Asl.CompileFlags & NODE_IS_TARGET) 321 { 322 MethodInfo->ArgInitialized[RegisterNumber] = TRUE; 323 } 324 325 /* 326 * Otherwise, this is a reference, check if the Arg 327 * has been previously initialized. 328 * 329 * The only operator that accepts an uninitialized value is ObjectType() 330 */ 331 else if ((!MethodInfo->ArgInitialized[RegisterNumber]) && 332 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_OBJECTTYPE)) 333 { 334 AslError (ASL_ERROR, ASL_MSG_ARG_INIT, Op, ArgName); 335 } 336 337 /* Flag this arg if it is not a "real" argument to the method */ 338 339 if (RegisterNumber >= MethodInfo->NumArguments) 340 { 341 AslError (ASL_REMARK, ASL_MSG_NOT_PARAMETER, Op, ArgName); 342 } 343 break; 344 345 case PARSEOP_RETURN: 346 347 if (!MethodInfo) 348 { 349 /* 350 * Probably was an error in the method declaration, 351 * no additional error here 352 */ 353 ACPI_WARNING ((AE_INFO, "%p, No parent method", Op)); 354 return (AE_ERROR); 355 } 356 357 /* 358 * A child indicates a possible return value. A simple Return or 359 * Return() is marked with NODE_IS_NULL_RETURN by the parser so 360 * that it is not counted as a "real" return-with-value, although 361 * the AML code that is actually emitted is Return(0). The AML 362 * definition of Return has a required parameter, so we are 363 * forced to convert a null return to Return(0). 364 */ 365 if ((Op->Asl.Child) && 366 (Op->Asl.Child->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG) && 367 (!(Op->Asl.Child->Asl.CompileFlags & NODE_IS_NULL_RETURN))) 368 { 369 MethodInfo->NumReturnWithValue++; 370 } 371 else 372 { 373 MethodInfo->NumReturnNoValue++; 374 } 375 break; 376 377 case PARSEOP_BREAK: 378 case PARSEOP_CONTINUE: 379 380 Next = Op->Asl.Parent; 381 while (Next) 382 { 383 if (Next->Asl.ParseOpcode == PARSEOP_WHILE) 384 { 385 break; 386 } 387 Next = Next->Asl.Parent; 388 } 389 390 if (!Next) 391 { 392 AslError (ASL_ERROR, ASL_MSG_NO_WHILE, Op, NULL); 393 } 394 break; 395 396 case PARSEOP_STALL: 397 398 /* We can range check if the argument is an integer */ 399 400 if ((Op->Asl.Child->Asl.ParseOpcode == PARSEOP_INTEGER) && 401 (Op->Asl.Child->Asl.Value.Integer > ACPI_UINT8_MAX)) 402 { 403 AslError (ASL_ERROR, ASL_MSG_INVALID_TIME, Op, NULL); 404 } 405 break; 406 407 case PARSEOP_DEVICE: 408 409 if (!ApFindNameInDeviceTree (METHOD_NAME__HID, Op) && 410 !ApFindNameInDeviceTree (METHOD_NAME__ADR, Op)) 411 { 412 AslError (ASL_WARNING, ASL_MSG_MISSING_DEPENDENCY, Op, 413 "Device object requires a _HID or _ADR in same scope"); 414 } 415 break; 416 417 case PARSEOP_EVENT: 418 case PARSEOP_MUTEX: 419 case PARSEOP_OPERATIONREGION: 420 case PARSEOP_POWERRESOURCE: 421 case PARSEOP_PROCESSOR: 422 case PARSEOP_THERMALZONE: 423 424 /* 425 * The first operand is a name to be created in the namespace. 426 * Check against the reserved list. 427 */ 428 i = ApCheckForPredefinedName (Op, Op->Asl.NameSeg); 429 if (i < ACPI_VALID_RESERVED_NAME_MAX) 430 { 431 AslError (ASL_ERROR, ASL_MSG_RESERVED_USE, 432 Op, Op->Asl.ExternalName); 433 } 434 break; 435 436 case PARSEOP_NAME: 437 438 /* Typecheck any predefined names statically defined with Name() */ 439 440 ApCheckForPredefinedObject (Op, Op->Asl.NameSeg); 441 442 /* Special typechecking for _HID */ 443 444 if (!strcmp (METHOD_NAME__HID, Op->Asl.NameSeg)) 445 { 446 Next = Op->Asl.Child->Asl.Next; 447 AnCheckId (Next, ASL_TYPE_HID); 448 } 449 450 /* Special typechecking for _CID */ 451 452 else if (!strcmp (METHOD_NAME__CID, Op->Asl.NameSeg)) 453 { 454 Next = Op->Asl.Child->Asl.Next; 455 456 if ((Next->Asl.ParseOpcode == PARSEOP_PACKAGE) || 457 (Next->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE)) 458 { 459 Next = Next->Asl.Child; 460 while (Next) 461 { 462 AnCheckId (Next, ASL_TYPE_CID); 463 Next = Next->Asl.Next; 464 } 465 } 466 else 467 { 468 AnCheckId (Next, ASL_TYPE_CID); 469 } 470 } 471 472 break; 473 474 default: 475 476 break; 477 } 478 479 /* Check for named object creation within a non-serialized method */ 480 481 MtCheckNamedObjectInMethod (Op, MethodInfo); 482 return (AE_OK); 483 } 484 485 486 /******************************************************************************* 487 * 488 * FUNCTION: MtCheckNamedObjectInMethod 489 * 490 * PARAMETERS: Op - Current parser op 491 * MethodInfo - Info for method being parsed 492 * 493 * RETURN: None 494 * 495 * DESCRIPTION: Detect if a non-serialized method is creating a named object, 496 * which could possibly cause problems if two threads execute 497 * the method concurrently. Emit a remark in this case. 498 * 499 ******************************************************************************/ 500 501 static void 502 MtCheckNamedObjectInMethod ( 503 ACPI_PARSE_OBJECT *Op, 504 ASL_METHOD_INFO *MethodInfo) 505 { 506 const ACPI_OPCODE_INFO *OpInfo; 507 508 509 /* We don't care about actual method declarations or scopes */ 510 511 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) || 512 (Op->Asl.AmlOpcode == AML_SCOPE_OP)) 513 { 514 return; 515 } 516 517 /* Determine if we are creating a named object */ 518 519 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 520 if (OpInfo->Class == AML_CLASS_NAMED_OBJECT) 521 { 522 /* 523 * If we have a named object created within a non-serialized method, 524 * emit a remark that the method should be serialized. 525 * 526 * Reason: If a thread blocks within the method for any reason, and 527 * another thread enters the method, the method will fail because an 528 * attempt will be made to create the same object twice. 529 */ 530 if (MethodInfo && !MethodInfo->ShouldBeSerialized) 531 { 532 AslError (ASL_REMARK, ASL_MSG_SERIALIZED_REQUIRED, MethodInfo->Op, 533 "due to creation of named objects within"); 534 535 /* Emit message only ONCE per method */ 536 537 MethodInfo->ShouldBeSerialized = TRUE; 538 } 539 } 540 } 541 542 543 /******************************************************************************* 544 * 545 * FUNCTION: MtMethodAnalysisWalkEnd 546 * 547 * PARAMETERS: ASL_WALK_CALLBACK 548 * 549 * RETURN: Status 550 * 551 * DESCRIPTION: Ascending callback for analysis walk. Complete method 552 * return analysis. 553 * 554 ******************************************************************************/ 555 556 ACPI_STATUS 557 MtMethodAnalysisWalkEnd ( 558 ACPI_PARSE_OBJECT *Op, 559 UINT32 Level, 560 void *Context) 561 { 562 ASL_ANALYSIS_WALK_INFO *WalkInfo = (ASL_ANALYSIS_WALK_INFO *) Context; 563 ASL_METHOD_INFO *MethodInfo = WalkInfo->MethodStack; 564 565 566 switch (Op->Asl.ParseOpcode) 567 { 568 case PARSEOP_METHOD: 569 case PARSEOP_RETURN: 570 571 if (!MethodInfo) 572 { 573 printf ("No method info for method! [%s]\n", Op->Asl.Namepath); 574 AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op, 575 "No method info for this method"); 576 577 CmCleanupAndExit (); 578 return (AE_AML_INTERNAL); 579 } 580 break; 581 582 default: 583 584 break; 585 } 586 587 switch (Op->Asl.ParseOpcode) 588 { 589 case PARSEOP_METHOD: 590 591 WalkInfo->MethodStack = MethodInfo->Next; 592 593 /* 594 * Check if there is no return statement at the end of the 595 * method AND we can actually get there -- i.e., the execution 596 * of the method can possibly terminate without a return statement. 597 */ 598 if ((!AnLastStatementIsReturn (Op)) && 599 (!(Op->Asl.CompileFlags & NODE_HAS_NO_EXIT))) 600 { 601 /* 602 * No return statement, and execution can possibly exit 603 * via this path. This is equivalent to Return () 604 */ 605 MethodInfo->NumReturnNoValue++; 606 } 607 608 /* 609 * Check for case where some return statements have a return value 610 * and some do not. Exit without a return statement is a return with 611 * no value 612 */ 613 if (MethodInfo->NumReturnNoValue && 614 MethodInfo->NumReturnWithValue) 615 { 616 AslError (ASL_WARNING, ASL_MSG_RETURN_TYPES, Op, 617 Op->Asl.ExternalName); 618 } 619 620 /* 621 * If there are any RETURN() statements with no value, or there is a 622 * control path that allows the method to exit without a return value, 623 * we mark the method as a method that does not return a value. This 624 * knowledge can be used to check method invocations that expect a 625 * returned value. 626 */ 627 if (MethodInfo->NumReturnNoValue) 628 { 629 if (MethodInfo->NumReturnWithValue) 630 { 631 Op->Asl.CompileFlags |= NODE_METHOD_SOME_NO_RETVAL; 632 } 633 else 634 { 635 Op->Asl.CompileFlags |= NODE_METHOD_NO_RETVAL; 636 } 637 } 638 639 /* 640 * Check predefined method names for correct return behavior 641 * and correct number of arguments. Also, some special checks 642 * For GPE and _REG methods. 643 */ 644 if (ApCheckForPredefinedMethod (Op, MethodInfo)) 645 { 646 /* Special check for two names like _L01 and _E01 in same scope */ 647 648 ApCheckForGpeNameConflict (Op); 649 650 /* 651 * Special check for _REG: Must have an operation region definition 652 * within the same scope! 653 */ 654 ApCheckRegMethod (Op); 655 } 656 657 ACPI_FREE (MethodInfo); 658 break; 659 660 case PARSEOP_NAME: 661 662 /* Special check for two names like _L01 and _E01 in same scope */ 663 664 ApCheckForGpeNameConflict (Op); 665 break; 666 667 case PARSEOP_RETURN: 668 669 /* 670 * If the parent is a predefined method name, attempt to typecheck 671 * the return value. Only static types can be validated. 672 */ 673 ApCheckPredefinedReturnValue (Op, MethodInfo); 674 675 /* 676 * The parent block does not "exit" and continue execution -- the 677 * method is terminated here with the Return() statement. 678 */ 679 Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT; 680 681 /* Used in the "typing" pass later */ 682 683 Op->Asl.ParentMethod = MethodInfo->Op; 684 685 /* 686 * If there is a peer node after the return statement, then this 687 * node is unreachable code -- i.e., it won't be executed because of 688 * the preceding Return() statement. 689 */ 690 if (Op->Asl.Next) 691 { 692 AslError (ASL_WARNING, ASL_MSG_UNREACHABLE_CODE, 693 Op->Asl.Next, NULL); 694 } 695 break; 696 697 case PARSEOP_IF: 698 699 if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) && 700 (Op->Asl.Next) && 701 (Op->Asl.Next->Asl.ParseOpcode == PARSEOP_ELSE)) 702 { 703 /* 704 * This IF has a corresponding ELSE. The IF block has no exit, 705 * (it contains an unconditional Return) 706 * mark the ELSE block to remember this fact. 707 */ 708 Op->Asl.Next->Asl.CompileFlags |= NODE_IF_HAS_NO_EXIT; 709 } 710 break; 711 712 case PARSEOP_ELSE: 713 714 if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) && 715 (Op->Asl.CompileFlags & NODE_IF_HAS_NO_EXIT)) 716 { 717 /* 718 * This ELSE block has no exit and the corresponding IF block 719 * has no exit either. Therefore, the parent node has no exit. 720 */ 721 Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT; 722 } 723 break; 724 725 726 default: 727 728 if ((Op->Asl.CompileFlags & NODE_HAS_NO_EXIT) && 729 (Op->Asl.Parent)) 730 { 731 /* If this node has no exit, then the parent has no exit either */ 732 733 Op->Asl.Parent->Asl.CompileFlags |= NODE_HAS_NO_EXIT; 734 } 735 break; 736 } 737 738 return (AE_OK); 739 } 740