1 /****************************************************************************** 2 * 3 * Module Name: aslxref - Namespace cross-reference 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2020, 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 "aslcompiler.h" 45 #include "aslcompiler.y.h" 46 #include "acparser.h" 47 #include "amlcode.h" 48 #include "acnamesp.h" 49 #include "acdispat.h" 50 51 52 #define _COMPONENT ACPI_COMPILER 53 ACPI_MODULE_NAME ("aslxref") 54 55 /* Local prototypes */ 56 57 static ACPI_STATUS 58 XfNamespaceLocateBegin ( 59 ACPI_PARSE_OBJECT *Op, 60 UINT32 Level, 61 void *Context); 62 63 static ACPI_STATUS 64 XfNamespaceLocateEnd ( 65 ACPI_PARSE_OBJECT *Op, 66 UINT32 Level, 67 void *Context); 68 69 static BOOLEAN 70 XfValidateCrossReference ( 71 ACPI_PARSE_OBJECT *Op, 72 const ACPI_OPCODE_INFO *OpInfo, 73 ACPI_NAMESPACE_NODE *Node); 74 75 static BOOLEAN 76 XfObjectExists ( 77 char *Name); 78 79 static ACPI_STATUS 80 XfCompareOneNamespaceObject ( 81 ACPI_HANDLE ObjHandle, 82 UINT32 Level, 83 void *Context, 84 void **ReturnValue); 85 86 static void 87 XfCheckFieldRange ( 88 ACPI_PARSE_OBJECT *Op, 89 UINT32 RegionBitLength, 90 UINT32 FieldBitOffset, 91 UINT32 FieldBitLength, 92 UINT32 AccessBitWidth); 93 94 static BOOLEAN 95 XfFindCondRefOfName ( 96 ACPI_NAMESPACE_NODE *Node, 97 ACPI_PARSE_OBJECT *Op); 98 99 static BOOLEAN 100 XfRefIsGuardedByIfCondRefOf ( 101 ACPI_NAMESPACE_NODE *Node, 102 ACPI_PARSE_OBJECT *Op); 103 104 105 /******************************************************************************* 106 * 107 * FUNCTION: XfCrossReferenceNamespace 108 * 109 * PARAMETERS: None 110 * 111 * RETURN: Status 112 * 113 * DESCRIPTION: Perform a cross reference check of the parse tree against the 114 * namespace. Every named referenced within the parse tree 115 * should be get resolved with a namespace lookup. If not, the 116 * original reference in the ASL code is invalid -- i.e., refers 117 * to a non-existent object. 118 * 119 * NOTE: The ASL "External" operator causes the name to be inserted into the 120 * namespace so that references to the external name will be resolved 121 * correctly here. 122 * 123 ******************************************************************************/ 124 125 ACPI_STATUS 126 XfCrossReferenceNamespace ( 127 void) 128 { 129 ACPI_WALK_STATE *WalkState; 130 131 132 /* 133 * Create a new walk state for use when looking up names 134 * within the namespace (Passed as context to the callbacks) 135 */ 136 WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL); 137 if (!WalkState) 138 { 139 return (AE_NO_MEMORY); 140 } 141 142 /* Walk the entire parse tree */ 143 144 TrWalkParseTree (AslGbl_ParseTreeRoot, ASL_WALK_VISIT_TWICE, 145 XfNamespaceLocateBegin, XfNamespaceLocateEnd, WalkState); 146 147 ACPI_FREE (WalkState); 148 return (AE_OK); 149 } 150 151 152 /******************************************************************************* 153 * 154 * FUNCTION: XfObjectExists 155 * 156 * PARAMETERS: Name - 4 char ACPI name 157 * 158 * RETURN: TRUE if name exists in namespace 159 * 160 * DESCRIPTION: Walk the namespace to find an object 161 * 162 ******************************************************************************/ 163 164 static BOOLEAN 165 XfObjectExists ( 166 char *Name) 167 { 168 ACPI_STATUS Status; 169 170 171 /* Walk entire namespace from the supplied root */ 172 173 Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, 174 ACPI_UINT32_MAX, FALSE, XfCompareOneNamespaceObject, NULL, 175 Name, NULL); 176 if (Status == AE_CTRL_TRUE) 177 { 178 /* At least one instance of the name was found */ 179 180 return (TRUE); 181 } 182 183 return (FALSE); 184 } 185 186 187 /******************************************************************************* 188 * 189 * FUNCTION: XfCompareOneNamespaceObject 190 * 191 * PARAMETERS: ACPI_WALK_CALLBACK 192 * 193 * RETURN: Status 194 * 195 * DESCRIPTION: Compare name of one object. 196 * 197 ******************************************************************************/ 198 199 static ACPI_STATUS 200 XfCompareOneNamespaceObject ( 201 ACPI_HANDLE ObjHandle, 202 UINT32 Level, 203 void *Context, 204 void **ReturnValue) 205 { 206 ACPI_NAMESPACE_NODE *Node = (ACPI_NAMESPACE_NODE *) ObjHandle; 207 208 209 /* Simply check the name */ 210 211 if (*((UINT32 *) (Context)) == Node->Name.Integer) 212 { 213 /* Abort walk if we found one instance */ 214 215 return (AE_CTRL_TRUE); 216 } 217 218 return (AE_OK); 219 } 220 221 222 /******************************************************************************* 223 * 224 * FUNCTION: XfCheckFieldRange 225 * 226 * PARAMETERS: RegionBitLength - Length of entire parent region 227 * FieldBitOffset - Start of the field unit (within region) 228 * FieldBitLength - Entire length of field unit 229 * AccessBitWidth - Access width of the field unit 230 * 231 * RETURN: None 232 * 233 * DESCRIPTION: Check one field unit to make sure it fits in the parent 234 * op region. 235 * 236 * Note: AccessBitWidth must be either 8,16,32, or 64 237 * 238 ******************************************************************************/ 239 240 static void 241 XfCheckFieldRange ( 242 ACPI_PARSE_OBJECT *Op, 243 UINT32 RegionBitLength, 244 UINT32 FieldBitOffset, 245 UINT32 FieldBitLength, 246 UINT32 AccessBitWidth) 247 { 248 UINT32 FieldEndBitOffset; 249 250 251 /* 252 * Check each field unit against the region size. The entire 253 * field unit (start offset plus length) must fit within the 254 * region. 255 */ 256 FieldEndBitOffset = FieldBitOffset + FieldBitLength; 257 258 if (FieldEndBitOffset > RegionBitLength) 259 { 260 /* Field definition itself is beyond the end-of-region */ 261 262 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_OFFSET, Op, NULL); 263 return; 264 } 265 266 /* 267 * Now check that the field plus AccessWidth doesn't go beyond 268 * the end-of-region. Assumes AccessBitWidth is a power of 2 269 */ 270 FieldEndBitOffset = ACPI_ROUND_UP (FieldEndBitOffset, AccessBitWidth); 271 272 if (FieldEndBitOffset > RegionBitLength) 273 { 274 /* Field definition combined with the access is beyond EOR */ 275 276 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_ACCESS_WIDTH, Op, NULL); 277 } 278 } 279 280 281 /******************************************************************************* 282 * 283 * FUNCTION: XfNamespaceLocateBegin 284 * 285 * PARAMETERS: ASL_WALK_CALLBACK 286 * 287 * RETURN: Status 288 * 289 * DESCRIPTION: Descending callback used during cross-reference. For named 290 * object references, attempt to locate the name in the 291 * namespace. 292 * 293 * NOTE: ASL references to named fields within resource descriptors are 294 * resolved to integer values here. Therefore, this step is an 295 * important part of the code generation. We don't know that the 296 * name refers to a resource descriptor until now. 297 * 298 ******************************************************************************/ 299 300 static ACPI_STATUS 301 XfNamespaceLocateBegin ( 302 ACPI_PARSE_OBJECT *Op, 303 UINT32 Level, 304 void *Context) 305 { 306 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context; 307 ACPI_NAMESPACE_NODE *Node; 308 ACPI_STATUS Status; 309 ACPI_OBJECT_TYPE ObjectType; 310 char *Path; 311 UINT8 PassedArgs; 312 ACPI_PARSE_OBJECT *NextOp; 313 ACPI_PARSE_OBJECT *OwningOp; 314 ACPI_PARSE_OBJECT *SpaceIdOp; 315 UINT32 MinimumLength; 316 UINT32 Offset; 317 UINT32 FieldBitLength; 318 UINT32 TagBitLength; 319 UINT8 Message = 0; 320 const ACPI_OPCODE_INFO *OpInfo; 321 UINT32 Flags; 322 ASL_METHOD_LOCAL *MethodLocals = NULL; 323 ASL_METHOD_LOCAL *MethodArgs = NULL; 324 int RegisterNumber; 325 UINT32 i; 326 ACPI_NAMESPACE_NODE *DeclarationParentMethod; 327 ACPI_PARSE_OBJECT *ReferenceParentMethod; 328 329 330 ACPI_FUNCTION_TRACE_PTR (XfNamespaceLocateBegin, Op); 331 332 333 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) && Op->Asl.Node) 334 { 335 Node = Op->Asl.Node; 336 337 /* Support for method LocalX/ArgX analysis */ 338 339 if (!Node->MethodLocals) 340 { 341 /* Create local/arg info blocks */ 342 343 MethodLocals = UtLocalCalloc ( 344 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_LOCALS); 345 Node->MethodLocals = MethodLocals; 346 347 MethodArgs = UtLocalCalloc ( 348 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_ARGS); 349 Node->MethodArgs = MethodArgs; 350 351 /* 352 * Get the method argument count 353 * First, get the name node 354 */ 355 NextOp = Op->Asl.Child; 356 357 /* Get the NumArguments node */ 358 359 NextOp = NextOp->Asl.Next; 360 Node->ArgCount = (UINT8) 361 (((UINT8) NextOp->Asl.Value.Integer) & 0x07); 362 363 /* We will track all possible ArgXs */ 364 365 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 366 { 367 if (i < Node->ArgCount) 368 { 369 /* Real Args are always "initialized" */ 370 371 MethodArgs[i].Flags = ASL_ARG_INITIALIZED; 372 } 373 else 374 { 375 /* Other ArgXs can be used as locals */ 376 377 MethodArgs[i].Flags = ASL_ARG_IS_LOCAL; 378 } 379 380 MethodArgs[i].Op = Op; 381 } 382 } 383 } 384 385 /* 386 * If this node is the actual declaration of a name 387 * [such as the XXXX name in "Method (XXXX)"], 388 * we are not interested in it here. We only care about names that are 389 * references to other objects within the namespace and the parent objects 390 * of name declarations 391 */ 392 if (Op->Asl.CompileFlags & OP_IS_NAME_DECLARATION) 393 { 394 return_ACPI_STATUS (AE_OK); 395 } 396 397 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 398 399 /* Check method LocalX variables */ 400 401 if (OpInfo->Type == AML_TYPE_LOCAL_VARIABLE) 402 { 403 /* Find parent method Op */ 404 405 NextOp = UtGetParentMethodOp (Op); 406 if (!NextOp) 407 { 408 return_ACPI_STATUS (AE_OK); 409 } 410 411 /* Get method node */ 412 413 Node = NextOp->Asl.Node; 414 415 RegisterNumber = Op->Asl.AmlOpcode & 0x0007; /* 0x60 through 0x67 */ 416 MethodLocals = Node->MethodLocals; 417 418 if (Op->Asl.CompileFlags & OP_IS_TARGET) 419 { 420 /* Local is being initialized */ 421 422 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_INITIALIZED; 423 MethodLocals[RegisterNumber].Op = Op; 424 425 return_ACPI_STATUS (AE_OK); 426 } 427 428 /* Mark this Local as referenced */ 429 430 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_REFERENCED; 431 MethodLocals[RegisterNumber].Op = Op; 432 433 return_ACPI_STATUS (AE_OK); 434 } 435 436 /* Check method ArgX variables */ 437 438 if (OpInfo->Type == AML_TYPE_METHOD_ARGUMENT) 439 { 440 /* Find parent method Op */ 441 442 NextOp = UtGetParentMethodOp (Op); 443 if (!NextOp) 444 { 445 return_ACPI_STATUS (AE_OK); 446 } 447 448 /* Get method node */ 449 450 Node = NextOp->Asl.Node; 451 452 /* Get Arg # */ 453 454 RegisterNumber = Op->Asl.AmlOpcode - AML_ARG0; /* 0x68 through 0x6F */ 455 MethodArgs = Node->MethodArgs; 456 457 /* Mark this Arg as referenced */ 458 459 MethodArgs[RegisterNumber].Flags |= ASL_ARG_REFERENCED; 460 MethodArgs[RegisterNumber].Op = Op; 461 462 if (Op->Asl.CompileFlags & OP_IS_TARGET) 463 { 464 /* Arg is being initialized */ 465 466 MethodArgs[RegisterNumber].Flags |= ASL_ARG_INITIALIZED; 467 } 468 469 return_ACPI_STATUS (AE_OK); 470 } 471 472 /* 473 * After method ArgX and LocalX, we are only interested in opcodes 474 * that have an associated name 475 */ 476 if ((!(OpInfo->Flags & AML_NAMED)) && 477 (!(OpInfo->Flags & AML_CREATE)) && 478 (Op->Asl.ParseOpcode != PARSEOP_NAMESTRING) && 479 (Op->Asl.ParseOpcode != PARSEOP_NAMESEG) && 480 (Op->Asl.ParseOpcode != PARSEOP_METHODCALL) && 481 (Op->Asl.ParseOpcode != PARSEOP_EXTERNAL)) 482 { 483 return_ACPI_STATUS (AE_OK); 484 } 485 486 /* 487 * We must enable the "search-to-root" for single NameSegs, but 488 * we have to be very careful about opening up scopes 489 */ 490 Flags = ACPI_NS_SEARCH_PARENT; 491 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 492 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 493 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 494 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL) || 495 (Op->Asl.ParseOpcode == PARSEOP_CONDREFOF)) 496 { 497 /* 498 * These are name references, do not push the scope stack 499 * for them. 500 */ 501 Flags |= ACPI_NS_DONT_OPEN_SCOPE; 502 } 503 504 /* Get the NamePath from the appropriate place */ 505 506 if (OpInfo->Flags & AML_NAMED) 507 { 508 /* For nearly all NAMED operators, the name reference is the first child */ 509 510 Path = Op->Asl.Child->Asl.Value.String; 511 if (Op->Asl.AmlOpcode == AML_ALIAS_OP) 512 { 513 /* 514 * ALIAS is the only oddball opcode, the name declaration 515 * (alias name) is the second operand 516 */ 517 Path = Op->Asl.Child->Asl.Next->Asl.Value.String; 518 } 519 } 520 else if (OpInfo->Flags & AML_CREATE) 521 { 522 /* Name must appear as the last parameter */ 523 524 NextOp = Op->Asl.Child; 525 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 526 { 527 NextOp = NextOp->Asl.Next; 528 } 529 530 Path = NextOp->Asl.Value.String; 531 } 532 else 533 { 534 Path = Op->Asl.Value.String; 535 } 536 537 ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode); 538 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 539 "Type=%s\n", AcpiUtGetTypeName (ObjectType))); 540 541 /* 542 * Lookup the name in the namespace. Name must exist at this point, or it 543 * is an invalid reference. 544 * 545 * The namespace is also used as a lookup table for references to resource 546 * descriptors and the fields within them. 547 */ 548 AslGbl_NsLookupCount++; 549 550 Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType, 551 ACPI_IMODE_EXECUTE, Flags, WalkState, &Node); 552 if (ACPI_FAILURE (Status)) 553 { 554 if (Status == AE_NOT_FOUND) 555 { 556 /* 557 * We didn't find the name reference by path -- we can qualify this 558 * a little better before we print an error message 559 */ 560 561 if ((Op->Asl.Parent) && 562 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF)) 563 { 564 /* 565 * One special case: CondRefOf operator - if the name doesn't 566 * exist at this point, it means that there's no actual or 567 * external declaration. If the name is not found, just ignore 568 * it, the point of the operator is to determine if the name 569 * exists at runtime. We wanted to see if this named object 570 * exists to facilitate analysis to allow protected usage of 571 * undeclared externals. 572 */ 573 return_ACPI_STATUS (AE_OK); 574 } 575 else if (strlen (Path) == ACPI_NAMESEG_SIZE) 576 { 577 /* A simple, one-segment ACPI name */ 578 579 if (XfObjectExists (Path)) 580 { 581 /* 582 * There exists such a name, but we couldn't get to it 583 * from this scope 584 */ 585 AslError (ASL_ERROR, ASL_MSG_NOT_REACHABLE, Op, 586 Op->Asl.ExternalName); 587 } 588 else 589 { 590 /* The name doesn't exist, period */ 591 592 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, 593 Op, Op->Asl.ExternalName); 594 } 595 } 596 else 597 { 598 /* The NamePath contains multiple NameSegs */ 599 600 if ((OpInfo->Flags & AML_CREATE) || 601 (OpInfo->ObjectType == ACPI_TYPE_LOCAL_ALIAS)) 602 { 603 /* 604 * The new name is the last parameter. For the 605 * CreateXXXXField and Alias operators 606 */ 607 NextOp = Op->Asl.Child; 608 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 609 { 610 NextOp = NextOp->Asl.Next; 611 } 612 613 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, NextOp, 614 NextOp->Asl.ExternalName); 615 } 616 else if (OpInfo->Flags & AML_NAMED) 617 { 618 /* The new name is the first parameter */ 619 620 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, Op, 621 Op->Asl.ExternalName); 622 } 623 else if (Path[0] == AML_ROOT_PREFIX) 624 { 625 /* Full namepath from root, the object does not exist */ 626 627 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, Op, 628 Op->Asl.ExternalName); 629 } 630 else 631 { 632 /* 633 * Generic "not found" error. Cannot determine whether it 634 * doesn't exist or just can't be reached. However, we 635 * can differentiate between a NameSeg vs. NamePath. 636 */ 637 if (strlen (Op->Asl.ExternalName) == ACPI_NAMESEG_SIZE) 638 { 639 AslError (ASL_ERROR, ASL_MSG_NOT_FOUND, Op, 640 Op->Asl.ExternalName); 641 } 642 else 643 { 644 AslError (ASL_ERROR, ASL_MSG_NAMEPATH_NOT_EXIST, Op, 645 Op->Asl.ExternalName); 646 } 647 } 648 } 649 650 Status = AE_OK; 651 } 652 653 return_ACPI_STATUS (Status); 654 } 655 656 /* Check for an attempt to access an object in another method */ 657 658 if (!XfValidateCrossReference (Op, OpInfo, Node)) 659 { 660 AslError (ASL_ERROR, ASL_MSG_TEMPORARY_OBJECT, Op, 661 Op->Asl.ExternalName); 662 return_ACPI_STATUS (Status); 663 } 664 665 /* Object was found above, check for an illegal forward reference */ 666 667 if (Op->Asl.CompileFlags & OP_NOT_FOUND_DURING_LOAD) 668 { 669 /* 670 * During the load phase, this Op was flagged as a possible 671 * illegal forward reference. In other words, Op is a name path or 672 * name segment that refers to a named object declared after the 673 * reference. In this scinario, Node refers to the actual declaration 674 * and Op is a parse node that references the named object. 675 * 676 * Note: 677 * 678 * Object references inside of control methods are allowed to 679 * refer to objects declared outside of control methods. 680 * 681 * If the declaration and reference are both contained inside of the 682 * same method or outside of any method, this is a forward reference 683 * and should be reported as a compiler error. 684 */ 685 DeclarationParentMethod = UtGetParentMethodNode (Node); 686 ReferenceParentMethod = UtGetParentMethodOp (Op); 687 688 /* case 1: declaration and reference are both outside of method */ 689 690 if (!ReferenceParentMethod && !DeclarationParentMethod) 691 { 692 AslError (ASL_ERROR, ASL_MSG_ILLEGAL_FORWARD_REF, Op, 693 Op->Asl.ExternalName); 694 } 695 696 /* case 2: declaration and reference are both inside of the same method */ 697 698 else if (ReferenceParentMethod && DeclarationParentMethod && 699 ReferenceParentMethod == DeclarationParentMethod->Op) 700 { 701 AslError (ASL_ERROR, ASL_MSG_ILLEGAL_FORWARD_REF, Op, 702 Op->Asl.ExternalName); 703 } 704 } 705 706 /* Check for a reference vs. name declaration */ 707 708 if (!(OpInfo->Flags & AML_NAMED) && 709 !(OpInfo->Flags & AML_CREATE)) 710 { 711 /* This node has been referenced, mark it for reference check */ 712 713 Node->Flags |= ANOBJ_IS_REFERENCED; 714 } 715 716 /* 717 * Attempt to optimize the NamePath 718 * 719 * One special case: CondRefOf operator - not all AML interpreter 720 * implementations expect optimized namepaths as a parameter to this 721 * operator. They require relative name paths with prefix operators or 722 * namepaths starting with the root scope. 723 * 724 * Other AML interpreter implementations do not perform the namespace 725 * search that starts at the current scope and recursively searching the 726 * parent scope until the root scope. The lack of search is only known to 727 * occur for the namestring parameter for the CondRefOf operator. 728 */ 729 if ((Op->Asl.Parent) && 730 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_CONDREFOF)) 731 { 732 OptOptimizeNamePath (Op, OpInfo->Flags, WalkState, Path, Node); 733 } 734 735 /* 736 * 1) Dereference an alias (A name reference that is an alias) 737 * Aliases are not nested, the alias always points to the final object 738 */ 739 if ((Op->Asl.ParseOpcode != PARSEOP_ALIAS) && 740 (Node->Type == ACPI_TYPE_LOCAL_ALIAS)) 741 { 742 /* This node points back to the original PARSEOP_ALIAS */ 743 744 NextOp = Node->Op; 745 746 /* The first child is the alias target op */ 747 748 NextOp = NextOp->Asl.Child; 749 750 /* That in turn points back to original target alias node */ 751 752 if (NextOp->Asl.Node) 753 { 754 Node = NextOp->Asl.Node; 755 } 756 757 /* Else - forward reference to alias, will be resolved later */ 758 } 759 760 /* 2) Check for a reference to a resource descriptor */ 761 762 if ((Node->Type == ACPI_TYPE_LOCAL_RESOURCE_FIELD) || 763 (Node->Type == ACPI_TYPE_LOCAL_RESOURCE)) 764 { 765 /* 766 * This was a reference to a field within a resource descriptor. 767 * Extract the associated field offset (either a bit or byte 768 * offset depending on the field type) and change the named 769 * reference into an integer for AML code generation 770 */ 771 Offset = Node->Value; 772 TagBitLength = Node->Length; 773 774 /* 775 * If a field is being created, generate the length (in bits) of 776 * the field. Note: Opcodes other than CreateXxxField and Index 777 * can come through here. For other opcodes, we just need to 778 * convert the resource tag reference to an integer offset. 779 */ 780 switch (Op->Asl.Parent->Asl.AmlOpcode) 781 { 782 case AML_CREATE_FIELD_OP: /* Variable "Length" field, in bits */ 783 /* 784 * We know the length operand is an integer constant because 785 * we know that it contains a reference to a resource 786 * descriptor tag. 787 */ 788 FieldBitLength = (UINT32) Op->Asl.Next->Asl.Value.Integer; 789 break; 790 791 case AML_CREATE_BIT_FIELD_OP: 792 793 FieldBitLength = 1; 794 break; 795 796 case AML_CREATE_BYTE_FIELD_OP: 797 case AML_INDEX_OP: 798 799 FieldBitLength = 8; 800 break; 801 802 case AML_CREATE_WORD_FIELD_OP: 803 804 FieldBitLength = 16; 805 break; 806 807 case AML_CREATE_DWORD_FIELD_OP: 808 809 FieldBitLength = 32; 810 break; 811 812 case AML_CREATE_QWORD_FIELD_OP: 813 814 FieldBitLength = 64; 815 break; 816 817 default: 818 819 FieldBitLength = 0; 820 break; 821 } 822 823 /* Check the field length against the length of the resource tag */ 824 825 if (FieldBitLength) 826 { 827 if (TagBitLength < FieldBitLength) 828 { 829 Message = ASL_MSG_TAG_SMALLER; 830 } 831 else if (TagBitLength > FieldBitLength) 832 { 833 Message = ASL_MSG_TAG_LARGER; 834 } 835 836 if (Message) 837 { 838 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), 839 "Size mismatch, Tag: %u bit%s, Field: %u bit%s", 840 TagBitLength, (TagBitLength > 1) ? "s" : "", 841 FieldBitLength, (FieldBitLength > 1) ? "s" : ""); 842 843 AslError (ASL_WARNING, Message, Op, AslGbl_MsgBuffer); 844 } 845 } 846 847 /* Convert the BitOffset to a ByteOffset for certain opcodes */ 848 849 switch (Op->Asl.Parent->Asl.AmlOpcode) 850 { 851 case AML_CREATE_BYTE_FIELD_OP: 852 case AML_CREATE_WORD_FIELD_OP: 853 case AML_CREATE_DWORD_FIELD_OP: 854 case AML_CREATE_QWORD_FIELD_OP: 855 case AML_INDEX_OP: 856 857 Offset = ACPI_DIV_8 (Offset); 858 break; 859 860 default: 861 862 break; 863 } 864 865 /* Now convert this node to an integer whose value is the field offset */ 866 867 Op->Asl.AmlLength = 0; 868 Op->Asl.ParseOpcode = PARSEOP_INTEGER; 869 Op->Asl.Value.Integer = (UINT64) Offset; 870 Op->Asl.CompileFlags |= OP_IS_RESOURCE_FIELD; 871 872 OpcGenerateAmlOpcode (Op); 873 } 874 875 /* 3) Check for a method invocation */ 876 877 else if ((((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || (Op->Asl.ParseOpcode == PARSEOP_NAMESEG)) && 878 (Node->Type == ACPI_TYPE_METHOD) && 879 (Op->Asl.Parent) && 880 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_METHOD)) || 881 882 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL)) 883 { 884 /* 885 * A reference to a method within one of these opcodes is not an 886 * invocation of the method, it is simply a reference to the method. 887 * 888 * September 2016: Removed DeRefOf from this list 889 * July 2020: Added Alias to this list 890 */ 891 if ((Op->Asl.Parent) && 892 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_REFOF) || 893 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_PACKAGE) || 894 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE)|| 895 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_OBJECTTYPE) || 896 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_ALIAS))) 897 { 898 return_ACPI_STATUS (AE_OK); 899 } 900 901 /* 902 * There are two types of method invocation: 903 * 1) Invocation with arguments -- the parser recognizes this 904 * as a METHODCALL. 905 * 2) Invocation with no arguments --the parser cannot determine that 906 * this is a method invocation, therefore we have to figure it out 907 * here. 908 */ 909 if (Node->Type != ACPI_TYPE_METHOD) 910 { 911 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), "%s is a %s", 912 Op->Asl.ExternalName, AcpiUtGetTypeName (Node->Type)); 913 914 AslError (ASL_ERROR, ASL_MSG_NOT_METHOD, Op, AslGbl_MsgBuffer); 915 return_ACPI_STATUS (AE_OK); 916 } 917 918 /* Save the method node in the caller's op */ 919 920 Op->Asl.Node = Node; 921 if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF) 922 { 923 return_ACPI_STATUS (AE_OK); 924 } 925 926 /* 927 * This is a method invocation, with or without arguments. 928 * Count the number of arguments, each appears as a child 929 * under the parent node 930 */ 931 Op->Asl.ParseOpcode = PARSEOP_METHODCALL; 932 UtSetParseOpName (Op); 933 934 PassedArgs = 0; 935 NextOp = Op->Asl.Child; 936 937 while (NextOp) 938 { 939 PassedArgs++; 940 NextOp = NextOp->Asl.Next; 941 } 942 943 if (Node->Value != ASL_EXTERNAL_METHOD_UNKNOWN_PARAMS && 944 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) 945 { 946 /* 947 * Check the parsed arguments with the number expected by the 948 * method declaration itself 949 */ 950 if (PassedArgs != Node->Value) 951 { 952 if (Node->Flags & ANOBJ_IS_EXTERNAL) 953 { 954 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), 955 "according to previous use, %s requires %u", 956 Op->Asl.ExternalName, Node->Value); 957 } 958 else 959 { 960 snprintf (AslGbl_MsgBuffer, sizeof(AslGbl_MsgBuffer), 961 "%s requires %u", Op->Asl.ExternalName, 962 Node->Value); 963 } 964 965 if (PassedArgs < Node->Value) 966 { 967 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_LO, Op, AslGbl_MsgBuffer); 968 } 969 else 970 { 971 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_HI, Op, AslGbl_MsgBuffer); 972 } 973 } 974 } 975 976 /* 977 * At this point, a method call to an external method has been 978 * detected. As of 11/19/2019, iASL does not support parameter counts 979 * for methods declared as external. Therefore, save the parameter 980 * count of the first method call and use this count check other 981 * method calls to ensure that the methods are being called with the 982 * same amount of parameters. 983 */ 984 else if (Node->Type == ACPI_TYPE_METHOD && 985 (Node->Flags & ANOBJ_IS_EXTERNAL) && 986 Node->Value == ASL_EXTERNAL_METHOD_UNKNOWN_PARAMS && 987 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) 988 { 989 Node->Value = PassedArgs; 990 } 991 } 992 993 /* 4) Check for an ASL Field definition */ 994 995 else if ((Op->Asl.Parent) && 996 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_FIELD) || 997 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_BANKFIELD))) 998 { 999 /* 1000 * Offset checking for fields. If the parent operation region has a 1001 * constant length (known at compile time), we can check fields 1002 * defined in that region against the region length. This will catch 1003 * fields and field units that cannot possibly fit within the region. 1004 * 1005 * Note: Index fields do not directly reference an operation region, 1006 * thus they are not included in this check. 1007 */ 1008 if (Op == Op->Asl.Parent->Asl.Child) 1009 { 1010 /* 1011 * This is the first child of the field node, which is 1012 * the name of the region. Get the parse node for the 1013 * region -- which contains the length of the region. 1014 */ 1015 OwningOp = Node->Op; 1016 Op->Asl.Parent->Asl.ExtraValue = 1017 ACPI_MUL_8 ((UINT32) OwningOp->Asl.Value.Integer); 1018 1019 /* Examine the field access width */ 1020 1021 switch ((UINT8) Op->Asl.Parent->Asl.Value.Integer) 1022 { 1023 case AML_FIELD_ACCESS_ANY: 1024 case AML_FIELD_ACCESS_BYTE: 1025 case AML_FIELD_ACCESS_BUFFER: 1026 default: 1027 1028 MinimumLength = 1; 1029 break; 1030 1031 case AML_FIELD_ACCESS_WORD: 1032 1033 MinimumLength = 2; 1034 break; 1035 1036 case AML_FIELD_ACCESS_DWORD: 1037 1038 MinimumLength = 4; 1039 break; 1040 1041 case AML_FIELD_ACCESS_QWORD: 1042 1043 MinimumLength = 8; 1044 break; 1045 } 1046 1047 /* 1048 * Is the region at least as big as the access width? 1049 * Note: DataTableRegions have 0 length 1050 */ 1051 if (((UINT32) OwningOp->Asl.Value.Integer) && 1052 ((UINT32) OwningOp->Asl.Value.Integer < MinimumLength)) 1053 { 1054 AslError (ASL_ERROR, ASL_MSG_FIELD_ACCESS_WIDTH, Op, NULL); 1055 } 1056 1057 /* 1058 * Check EC/CMOS/SMBUS fields to make sure that the correct 1059 * access type is used (BYTE for EC/CMOS, BUFFER for SMBUS) 1060 */ 1061 SpaceIdOp = OwningOp->Asl.Child->Asl.Next; 1062 switch ((UINT32) SpaceIdOp->Asl.Value.Integer) 1063 { 1064 case ACPI_ADR_SPACE_EC: 1065 case ACPI_ADR_SPACE_CMOS: 1066 case ACPI_ADR_SPACE_GPIO: 1067 1068 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1069 AML_FIELD_ACCESS_BYTE) 1070 { 1071 AslError (ASL_ERROR, ASL_MSG_REGION_BYTE_ACCESS, Op, NULL); 1072 } 1073 break; 1074 1075 case ACPI_ADR_SPACE_SMBUS: 1076 case ACPI_ADR_SPACE_IPMI: 1077 case ACPI_ADR_SPACE_GSBUS: 1078 1079 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1080 AML_FIELD_ACCESS_BUFFER) 1081 { 1082 AslError (ASL_ERROR, ASL_MSG_REGION_BUFFER_ACCESS, Op, NULL); 1083 } 1084 break; 1085 1086 default: 1087 1088 /* Nothing to do for other address spaces */ 1089 1090 break; 1091 } 1092 } 1093 else 1094 { 1095 /* 1096 * This is one element of the field list. Check to make sure 1097 * that it does not go beyond the end of the parent operation region. 1098 * 1099 * In the code below: 1100 * Op->Asl.Parent->Asl.ExtraValue - Region Length (bits) 1101 * Op->Asl.ExtraValue - Field start offset (bits) 1102 * Op->Asl.Child->Asl.Value.Integer32 - Field length (bits) 1103 * Op->Asl.Child->Asl.ExtraValue - Field access width (bits) 1104 */ 1105 if (Op->Asl.Parent->Asl.ExtraValue && Op->Asl.Child) 1106 { 1107 XfCheckFieldRange (Op, 1108 Op->Asl.Parent->Asl.ExtraValue, 1109 Op->Asl.ExtraValue, 1110 (UINT32) Op->Asl.Child->Asl.Value.Integer, 1111 Op->Asl.Child->Asl.ExtraValue); 1112 } 1113 } 1114 } 1115 1116 /* 1117 * 5) Check for external resolution 1118 * 1119 * By this point, everything should be loaded in the namespace. If a 1120 * namespace lookup results in a namespace node that is an external, it 1121 * means that this named object was not defined in the input ASL. This 1122 * causes issues because there are plenty of incidents where developers 1123 * use the external keyword to suppress compiler errors about undefined 1124 * objects. Note: this only applies when compiling multiple definition 1125 * blocks. 1126 * 1127 * Do not check for external resolution in the following cases: 1128 * 1129 * case 1) External (ABCD) 1130 * 1131 * This declares ABCD as an external so there is no requirement for 1132 * ABCD to be loaded in the namespace when analyzing the actual 1133 * External() statement. 1134 * 1135 * case 2) CondRefOf (ABCD) 1136 * 1137 * This operator will query the ACPI namespace on the existence of 1138 * ABCD. If ABCD does not exist, this operator will return a 0 1139 * without incurring AML runtime errors. Therefore, ABCD is allowed 1140 * to not exist when analyzing the CondRefOf operator. 1141 * 1142 * case 3) External (ABCD) 1143 * if (CondRefOf (ABCD)) 1144 * { 1145 * Store (0, ABCD) 1146 * } 1147 * 1148 * In this case, ABCD is accessed only if it exists due to the if 1149 * statement so there is no need to flag the ABCD nested in the 1150 * store operator. 1151 */ 1152 if (AslGbl_ParseTreeRoot->Asl.Child && AslGbl_ParseTreeRoot->Asl.Child->Asl.Next && 1153 (Node->Flags & ANOBJ_IS_EXTERNAL) && 1154 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL && 1155 Op->Asl.ParseOpcode != PARSEOP_EXTERNAL && 1156 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_CONDREFOF && 1157 !XfRefIsGuardedByIfCondRefOf (Node, Op)) 1158 { 1159 AslError (ASL_ERROR, ASL_MSG_UNDEFINED_EXTERNAL, Op, NULL); 1160 } 1161 1162 /* 5) Check for a connection object */ 1163 #if 0 1164 else if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONNECTION) 1165 { 1166 return_ACPI_STATUS (Status); 1167 } 1168 #endif 1169 1170 Op->Asl.Node = Node; 1171 return_ACPI_STATUS (Status); 1172 } 1173 1174 1175 /******************************************************************************* 1176 * 1177 * FUNCTION: XfRefIsGuardedByIfCondRefOf 1178 * 1179 * PARAMETERS: Node - Named object reference node 1180 * Op - Named object reference parse node 1181 * 1182 * RETURN: BOOLEAN 1183 * 1184 * DESCRIPTION: returns true if Op checked inside if (CondRefOf (...)) 1185 * refers to Node. 1186 * 1187 ******************************************************************************/ 1188 1189 static BOOLEAN 1190 XfRefIsGuardedByIfCondRefOf ( 1191 ACPI_NAMESPACE_NODE *Node, 1192 ACPI_PARSE_OBJECT *Op) 1193 { 1194 ACPI_PARSE_OBJECT *Parent = Op->Asl.Parent; 1195 1196 1197 while (Parent) 1198 { 1199 if (Parent->Asl.ParseOpcode == PARSEOP_IF && 1200 XfFindCondRefOfName (Node, Parent->Asl.Child)) 1201 { 1202 return (TRUE); 1203 } 1204 1205 Parent = Parent->Asl.Parent; 1206 } 1207 1208 return (FALSE); 1209 } 1210 1211 1212 /******************************************************************************* 1213 * 1214 * FUNCTION: XfRefIsGuardedByIfCondRefOf 1215 * 1216 * PARAMETERS: Node - Named object reference node 1217 * Op - Named object reference parse node 1218 * 1219 * RETURN: BOOLEAN 1220 * 1221 * DESCRIPTION: returns true if Op checked inside if (CondRefOf (...)) 1222 * refers to Node. 1223 * 1224 ******************************************************************************/ 1225 1226 static BOOLEAN 1227 XfFindCondRefOfName ( 1228 ACPI_NAMESPACE_NODE *Node, 1229 ACPI_PARSE_OBJECT *Op) 1230 { 1231 BOOLEAN CondRefOfFound = FALSE; 1232 1233 1234 if (!Op) 1235 { 1236 return (FALSE); 1237 } 1238 1239 switch (Op->Asl.ParseOpcode) 1240 { 1241 case PARSEOP_CONDREFOF: 1242 1243 return (Op->Asl.Child->Common.Node == Node); 1244 break; 1245 1246 case PARSEOP_LAND: 1247 1248 CondRefOfFound = XfFindCondRefOfName (Node, Op->Asl.Child); 1249 if (CondRefOfFound) 1250 { 1251 return (TRUE); 1252 } 1253 1254 return (XfFindCondRefOfName (Node, Op->Asl.Child->Asl.Next)); 1255 break; 1256 1257 default: 1258 1259 return (FALSE); 1260 break; 1261 } 1262 } 1263 1264 1265 /******************************************************************************* 1266 * 1267 * FUNCTION: XfNamespaceLocateEnd 1268 * 1269 * PARAMETERS: ASL_WALK_CALLBACK 1270 * 1271 * RETURN: Status 1272 * 1273 * DESCRIPTION: Ascending callback used during cross reference. We only 1274 * need to worry about scope management here. 1275 * 1276 ******************************************************************************/ 1277 1278 static ACPI_STATUS 1279 XfNamespaceLocateEnd ( 1280 ACPI_PARSE_OBJECT *Op, 1281 UINT32 Level, 1282 void *Context) 1283 { 1284 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context; 1285 const ACPI_OPCODE_INFO *OpInfo; 1286 1287 1288 ACPI_FUNCTION_TRACE (XfNamespaceLocateEnd); 1289 1290 1291 /* We are only interested in opcodes that have an associated name */ 1292 1293 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 1294 if (!(OpInfo->Flags & AML_NAMED)) 1295 { 1296 return_ACPI_STATUS (AE_OK); 1297 } 1298 1299 /* Not interested in name references, we did not open a scope for them */ 1300 1301 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 1302 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 1303 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 1304 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL)) 1305 { 1306 return_ACPI_STATUS (AE_OK); 1307 } 1308 1309 /* Pop the scope stack if necessary */ 1310 1311 if (AcpiNsOpensScope (AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode))) 1312 { 1313 1314 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 1315 "%s: Popping scope for Op %p\n", 1316 AcpiUtGetTypeName (OpInfo->ObjectType), Op)); 1317 1318 (void) AcpiDsScopeStackPop (WalkState); 1319 } 1320 1321 return_ACPI_STATUS (AE_OK); 1322 } 1323 1324 1325 /******************************************************************************* 1326 * 1327 * FUNCTION: XfValidateCrossReference 1328 * 1329 * PARAMETERS: Op - Parse Op that references the object 1330 * OpInfo - Parse Op info struct 1331 * Node - Node for the referenced object 1332 * 1333 * RETURN: TRUE if the reference is legal, FALSE otherwise 1334 * 1335 * DESCRIPTION: Determine if a reference to another object is allowed. 1336 * 1337 * EXAMPLE: 1338 * Method (A) {Name (INT1, 1)} Declaration of object INT1 1339 * Method (B) (Store (2, \A.INT1)} Illegal reference to object INT1 1340 * (INT1 is temporary, valid only during 1341 * execution of A) 1342 * 1343 * NOTES: 1344 * A null pointer returned by either UtGetParentMethodOp or 1345 * UtGetParentMethodNode indicates that the parameter object is not 1346 * within a control method. 1347 * 1348 * Five cases are handled: Case(Op, Node) 1349 * 1) Case(0,0): Op is not within a method, Node is not --> OK 1350 * 2) Case(0,1): Op is not within a method, but Node is --> Illegal 1351 * 3) Case(1,0): Op is within a method, Node is not --> OK 1352 * 4) Case(1,1): Both are within the same method --> OK 1353 * 5) Case(1,1): Both are in methods, but not same method --> Illegal 1354 * 1355 ******************************************************************************/ 1356 1357 static BOOLEAN 1358 XfValidateCrossReference ( 1359 ACPI_PARSE_OBJECT *Op, 1360 const ACPI_OPCODE_INFO *OpInfo, 1361 ACPI_NAMESPACE_NODE *Node) 1362 { 1363 ACPI_PARSE_OBJECT *ReferencingMethodOp; 1364 ACPI_NAMESPACE_NODE *ReferencedMethodNode; 1365 1366 1367 /* Ignore actual named (and related) object declarations */ 1368 1369 if (OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_DEFER | AML_HAS_ARGS)) 1370 { 1371 return (TRUE); 1372 } 1373 1374 /* 1375 * 1) Search upwards in parse tree for owner of the referencing object 1376 * 2) Search upwards in namespace to find the owner of the referenced object 1377 */ 1378 ReferencingMethodOp = UtGetParentMethodOp (Op); 1379 ReferencedMethodNode = UtGetParentMethodNode (Node); 1380 1381 if (!ReferencingMethodOp && !ReferencedMethodNode) 1382 { 1383 /* 1384 * 1) Case (0,0): Both Op and Node are not within methods 1385 * --> OK 1386 */ 1387 return (TRUE); 1388 } 1389 1390 if (!ReferencingMethodOp && ReferencedMethodNode) 1391 { 1392 /* 1393 * 2) Case (0,1): Op is not in a method, but Node is within a 1394 * method --> illegal 1395 */ 1396 return (FALSE); 1397 } 1398 else if (ReferencingMethodOp && !ReferencedMethodNode) 1399 { 1400 /* 1401 * 3) Case (1,0): Op is within a method, but Node is not 1402 * --> OK 1403 */ 1404 return (TRUE); 1405 } 1406 else if (ReferencingMethodOp->Asl.Node == ReferencedMethodNode) 1407 { 1408 /* 1409 * 4) Case (1,1): Both Op and Node are within the same method 1410 * --> OK 1411 */ 1412 return (TRUE); 1413 } 1414 else 1415 { 1416 /* 1417 * 5) Case (1,1), Op and Node are in different methods 1418 * --> Illegal 1419 */ 1420 return (FALSE); 1421 } 1422 } 1423