1 /****************************************************************************** 2 * 3 * Module Name: aslxref - Namespace cross-reference 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2019, 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 #include <contrib/dev/acpica/include/acnamesp.h> 157 #include <contrib/dev/acpica/include/acdispat.h> 158 159 160 #define _COMPONENT ACPI_COMPILER 161 ACPI_MODULE_NAME ("aslxref") 162 163 /* Local prototypes */ 164 165 static ACPI_STATUS 166 XfNamespaceLocateBegin ( 167 ACPI_PARSE_OBJECT *Op, 168 UINT32 Level, 169 void *Context); 170 171 static ACPI_STATUS 172 XfNamespaceLocateEnd ( 173 ACPI_PARSE_OBJECT *Op, 174 UINT32 Level, 175 void *Context); 176 177 static BOOLEAN 178 XfValidateCrossReference ( 179 ACPI_PARSE_OBJECT *Op, 180 const ACPI_OPCODE_INFO *OpInfo, 181 ACPI_NAMESPACE_NODE *Node); 182 183 static ACPI_PARSE_OBJECT * 184 XfGetParentMethod ( 185 ACPI_PARSE_OBJECT *Op); 186 187 static BOOLEAN 188 XfObjectExists ( 189 char *Name); 190 191 static ACPI_STATUS 192 XfCompareOneNamespaceObject ( 193 ACPI_HANDLE ObjHandle, 194 UINT32 Level, 195 void *Context, 196 void **ReturnValue); 197 198 static void 199 XfCheckFieldRange ( 200 ACPI_PARSE_OBJECT *Op, 201 UINT32 RegionBitLength, 202 UINT32 FieldBitOffset, 203 UINT32 FieldBitLength, 204 UINT32 AccessBitWidth); 205 206 207 /******************************************************************************* 208 * 209 * FUNCTION: XfCrossReferenceNamespace 210 * 211 * PARAMETERS: None 212 * 213 * RETURN: Status 214 * 215 * DESCRIPTION: Perform a cross reference check of the parse tree against the 216 * namespace. Every named referenced within the parse tree 217 * should be get resolved with a namespace lookup. If not, the 218 * original reference in the ASL code is invalid -- i.e., refers 219 * to a non-existent object. 220 * 221 * NOTE: The ASL "External" operator causes the name to be inserted into the 222 * namespace so that references to the external name will be resolved 223 * correctly here. 224 * 225 ******************************************************************************/ 226 227 ACPI_STATUS 228 XfCrossReferenceNamespace ( 229 void) 230 { 231 ACPI_WALK_STATE *WalkState; 232 233 234 /* 235 * Create a new walk state for use when looking up names 236 * within the namespace (Passed as context to the callbacks) 237 */ 238 WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL); 239 if (!WalkState) 240 { 241 return (AE_NO_MEMORY); 242 } 243 244 /* Walk the entire parse tree */ 245 246 TrWalkParseTree (AslGbl_ParseTreeRoot, ASL_WALK_VISIT_TWICE, 247 XfNamespaceLocateBegin, XfNamespaceLocateEnd, WalkState); 248 249 ACPI_FREE (WalkState); 250 return (AE_OK); 251 } 252 253 254 /******************************************************************************* 255 * 256 * FUNCTION: XfObjectExists 257 * 258 * PARAMETERS: Name - 4 char ACPI name 259 * 260 * RETURN: TRUE if name exists in namespace 261 * 262 * DESCRIPTION: Walk the namespace to find an object 263 * 264 ******************************************************************************/ 265 266 static BOOLEAN 267 XfObjectExists ( 268 char *Name) 269 { 270 ACPI_STATUS Status; 271 272 273 /* Walk entire namespace from the supplied root */ 274 275 Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, 276 ACPI_UINT32_MAX, FALSE, XfCompareOneNamespaceObject, NULL, 277 Name, NULL); 278 if (Status == AE_CTRL_TRUE) 279 { 280 /* At least one instance of the name was found */ 281 282 return (TRUE); 283 } 284 285 return (FALSE); 286 } 287 288 289 /******************************************************************************* 290 * 291 * FUNCTION: XfCompareOneNamespaceObject 292 * 293 * PARAMETERS: ACPI_WALK_CALLBACK 294 * 295 * RETURN: Status 296 * 297 * DESCRIPTION: Compare name of one object. 298 * 299 ******************************************************************************/ 300 301 static ACPI_STATUS 302 XfCompareOneNamespaceObject ( 303 ACPI_HANDLE ObjHandle, 304 UINT32 Level, 305 void *Context, 306 void **ReturnValue) 307 { 308 ACPI_NAMESPACE_NODE *Node = (ACPI_NAMESPACE_NODE *) ObjHandle; 309 310 311 /* Simply check the name */ 312 313 if (*((UINT32 *) (Context)) == Node->Name.Integer) 314 { 315 /* Abort walk if we found one instance */ 316 317 return (AE_CTRL_TRUE); 318 } 319 320 return (AE_OK); 321 } 322 323 324 /******************************************************************************* 325 * 326 * FUNCTION: XfCheckFieldRange 327 * 328 * PARAMETERS: RegionBitLength - Length of entire parent region 329 * FieldBitOffset - Start of the field unit (within region) 330 * FieldBitLength - Entire length of field unit 331 * AccessBitWidth - Access width of the field unit 332 * 333 * RETURN: None 334 * 335 * DESCRIPTION: Check one field unit to make sure it fits in the parent 336 * op region. 337 * 338 * Note: AccessBitWidth must be either 8,16,32, or 64 339 * 340 ******************************************************************************/ 341 342 static void 343 XfCheckFieldRange ( 344 ACPI_PARSE_OBJECT *Op, 345 UINT32 RegionBitLength, 346 UINT32 FieldBitOffset, 347 UINT32 FieldBitLength, 348 UINT32 AccessBitWidth) 349 { 350 UINT32 FieldEndBitOffset; 351 352 353 /* 354 * Check each field unit against the region size. The entire 355 * field unit (start offset plus length) must fit within the 356 * region. 357 */ 358 FieldEndBitOffset = FieldBitOffset + FieldBitLength; 359 360 if (FieldEndBitOffset > RegionBitLength) 361 { 362 /* Field definition itself is beyond the end-of-region */ 363 364 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_OFFSET, Op, NULL); 365 return; 366 } 367 368 /* 369 * Now check that the field plus AccessWidth doesn't go beyond 370 * the end-of-region. Assumes AccessBitWidth is a power of 2 371 */ 372 FieldEndBitOffset = ACPI_ROUND_UP (FieldEndBitOffset, AccessBitWidth); 373 374 if (FieldEndBitOffset > RegionBitLength) 375 { 376 /* Field definition combined with the access is beyond EOR */ 377 378 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_ACCESS_WIDTH, Op, NULL); 379 } 380 } 381 382 383 /******************************************************************************* 384 * 385 * FUNCTION: XfGetParentMethod 386 * 387 * PARAMETERS: Op - Parse Op to be checked 388 * 389 * RETURN: Control method Op if found. NULL otherwise 390 * 391 * DESCRIPTION: Find the control method parent of a parse op. Returns NULL if 392 * the input Op is not within a control method. 393 * 394 ******************************************************************************/ 395 396 static ACPI_PARSE_OBJECT * 397 XfGetParentMethod ( 398 ACPI_PARSE_OBJECT *Op) 399 { 400 ACPI_PARSE_OBJECT *NextOp; 401 402 403 NextOp = Op->Asl.Parent; 404 while (NextOp) 405 { 406 if (NextOp->Asl.AmlOpcode == AML_METHOD_OP) 407 { 408 return (NextOp); 409 } 410 411 NextOp = NextOp->Asl.Parent; 412 } 413 414 return (NULL); /* No parent method found */ 415 } 416 417 418 /******************************************************************************* 419 * 420 * FUNCTION: XfNamespaceLocateBegin 421 * 422 * PARAMETERS: ASL_WALK_CALLBACK 423 * 424 * RETURN: Status 425 * 426 * DESCRIPTION: Descending callback used during cross-reference. For named 427 * object references, attempt to locate the name in the 428 * namespace. 429 * 430 * NOTE: ASL references to named fields within resource descriptors are 431 * resolved to integer values here. Therefore, this step is an 432 * important part of the code generation. We don't know that the 433 * name refers to a resource descriptor until now. 434 * 435 ******************************************************************************/ 436 437 static ACPI_STATUS 438 XfNamespaceLocateBegin ( 439 ACPI_PARSE_OBJECT *Op, 440 UINT32 Level, 441 void *Context) 442 { 443 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context; 444 ACPI_NAMESPACE_NODE *Node; 445 ACPI_STATUS Status; 446 ACPI_OBJECT_TYPE ObjectType; 447 char *Path; 448 UINT8 PassedArgs; 449 ACPI_PARSE_OBJECT *NextOp; 450 ACPI_PARSE_OBJECT *OwningOp; 451 ACPI_PARSE_OBJECT *SpaceIdOp; 452 UINT32 MinimumLength; 453 UINT32 Offset; 454 UINT32 FieldBitLength; 455 UINT32 TagBitLength; 456 UINT8 Message = 0; 457 const ACPI_OPCODE_INFO *OpInfo; 458 UINT32 Flags; 459 ASL_METHOD_LOCAL *MethodLocals = NULL; 460 ASL_METHOD_LOCAL *MethodArgs = NULL; 461 int RegisterNumber; 462 UINT32 i; 463 464 465 ACPI_FUNCTION_TRACE_PTR (XfNamespaceLocateBegin, Op); 466 467 468 if ((Op->Asl.AmlOpcode == AML_METHOD_OP) && Op->Asl.Node) 469 { 470 Node = Op->Asl.Node; 471 472 /* Support for method LocalX/ArgX analysis */ 473 474 if (!Node->MethodLocals) 475 { 476 /* Create local/arg info blocks */ 477 478 MethodLocals = UtLocalCalloc ( 479 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_LOCALS); 480 Node->MethodLocals = MethodLocals; 481 482 MethodArgs = UtLocalCalloc ( 483 sizeof (ASL_METHOD_LOCAL) * ACPI_METHOD_NUM_ARGS); 484 Node->MethodArgs = MethodArgs; 485 486 /* 487 * Get the method argument count 488 * First, get the name node 489 */ 490 NextOp = Op->Asl.Child; 491 492 /* Get the NumArguments node */ 493 494 NextOp = NextOp->Asl.Next; 495 Node->ArgCount = (UINT8) 496 (((UINT8) NextOp->Asl.Value.Integer) & 0x07); 497 498 /* We will track all possible ArgXs */ 499 500 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) 501 { 502 if (i < Node->ArgCount) 503 { 504 /* Real Args are always "initialized" */ 505 506 MethodArgs[i].Flags = ASL_ARG_INITIALIZED; 507 } 508 else 509 { 510 /* Other ArgXs can be used as locals */ 511 512 MethodArgs[i].Flags = ASL_ARG_IS_LOCAL; 513 } 514 515 MethodArgs[i].Op = Op; 516 } 517 } 518 } 519 520 /* 521 * If this node is the actual declaration of a name 522 * [such as the XXXX name in "Method (XXXX)"], 523 * we are not interested in it here. We only care about names that are 524 * references to other objects within the namespace and the parent objects 525 * of name declarations 526 */ 527 if (Op->Asl.CompileFlags & OP_IS_NAME_DECLARATION) 528 { 529 return_ACPI_STATUS (AE_OK); 530 } 531 532 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 533 534 /* Check method LocalX variables */ 535 536 if (OpInfo->Type == AML_TYPE_LOCAL_VARIABLE) 537 { 538 /* Find parent method Op */ 539 540 NextOp = XfGetParentMethod (Op); 541 if (!NextOp) 542 { 543 return_ACPI_STATUS (AE_OK); 544 } 545 546 /* Get method node */ 547 548 Node = NextOp->Asl.Node; 549 550 RegisterNumber = Op->Asl.AmlOpcode & 0x0007; /* 0x60 through 0x67 */ 551 MethodLocals = Node->MethodLocals; 552 553 if (Op->Asl.CompileFlags & OP_IS_TARGET) 554 { 555 /* Local is being initialized */ 556 557 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_INITIALIZED; 558 MethodLocals[RegisterNumber].Op = Op; 559 560 return_ACPI_STATUS (AE_OK); 561 } 562 563 /* Mark this Local as referenced */ 564 565 MethodLocals[RegisterNumber].Flags |= ASL_LOCAL_REFERENCED; 566 MethodLocals[RegisterNumber].Op = Op; 567 568 return_ACPI_STATUS (AE_OK); 569 } 570 571 /* Check method ArgX variables */ 572 573 if (OpInfo->Type == AML_TYPE_METHOD_ARGUMENT) 574 { 575 /* Find parent method Op */ 576 577 NextOp = XfGetParentMethod (Op); 578 if (!NextOp) 579 { 580 return_ACPI_STATUS (AE_OK); 581 } 582 583 /* Get method node */ 584 585 Node = NextOp->Asl.Node; 586 587 /* Get Arg # */ 588 589 RegisterNumber = Op->Asl.AmlOpcode - AML_ARG0; /* 0x68 through 0x6F */ 590 MethodArgs = Node->MethodArgs; 591 592 /* Mark this Arg as referenced */ 593 594 MethodArgs[RegisterNumber].Flags |= ASL_ARG_REFERENCED; 595 MethodArgs[RegisterNumber].Op = Op; 596 597 if (Op->Asl.CompileFlags & OP_IS_TARGET) 598 { 599 /* Arg is being initialized */ 600 601 MethodArgs[RegisterNumber].Flags |= ASL_ARG_INITIALIZED; 602 } 603 604 return_ACPI_STATUS (AE_OK); 605 } 606 607 /* 608 * After method ArgX and LocalX, we are only interested in opcodes 609 * that have an associated name 610 */ 611 if ((!(OpInfo->Flags & AML_NAMED)) && 612 (!(OpInfo->Flags & AML_CREATE)) && 613 (Op->Asl.ParseOpcode != PARSEOP_NAMESTRING) && 614 (Op->Asl.ParseOpcode != PARSEOP_NAMESEG) && 615 (Op->Asl.ParseOpcode != PARSEOP_METHODCALL) && 616 (Op->Asl.ParseOpcode != PARSEOP_EXTERNAL) && 617 (OpInfo->Type != AML_TYPE_NAMED_FIELD)) 618 { 619 return_ACPI_STATUS (AE_OK); 620 } 621 622 /* 623 * One special case: CondRefOf operator - we don't care if the name exists 624 * or not at this point, just ignore it, the point of the operator is to 625 * determine if the name exists at runtime. 626 */ 627 if ((Op->Asl.Parent) && 628 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF)) 629 { 630 return_ACPI_STATUS (AE_OK); 631 } 632 633 /* 634 * We must enable the "search-to-root" for single NameSegs, but 635 * we have to be very careful about opening up scopes 636 */ 637 Flags = ACPI_NS_SEARCH_PARENT; 638 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 639 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 640 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 641 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL) || 642 (OpInfo->Type == AML_TYPE_NAMED_FIELD)) 643 { 644 /* 645 * These are name references, do not push the scope stack 646 * for them. 647 */ 648 Flags |= ACPI_NS_DONT_OPEN_SCOPE; 649 } 650 651 /* Get the NamePath from the appropriate place */ 652 653 if (OpInfo->Flags & AML_NAMED) 654 { 655 /* For nearly all NAMED operators, the name reference is the first child */ 656 657 Path = Op->Asl.Child->Asl.Value.String; 658 if (Op->Asl.AmlOpcode == AML_ALIAS_OP) 659 { 660 /* 661 * ALIAS is the only oddball opcode, the name declaration 662 * (alias name) is the second operand 663 */ 664 Path = Op->Asl.Child->Asl.Next->Asl.Value.String; 665 } 666 } 667 else if (OpInfo->Flags & AML_CREATE) 668 { 669 /* Name must appear as the last parameter */ 670 671 NextOp = Op->Asl.Child; 672 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 673 { 674 NextOp = NextOp->Asl.Next; 675 } 676 677 Path = NextOp->Asl.Value.String; 678 } 679 else if (OpInfo->Type == AML_TYPE_NAMED_FIELD) 680 { 681 Path = Op->Asl.Child->Asl.Value.String; 682 } 683 else 684 { 685 Path = Op->Asl.Value.String; 686 } 687 688 ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode); 689 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 690 "Type=%s\n", AcpiUtGetTypeName (ObjectType))); 691 692 /* 693 * Lookup the name in the namespace. Name must exist at this point, or it 694 * is an invalid reference. 695 * 696 * The namespace is also used as a lookup table for references to resource 697 * descriptors and the fields within them. 698 */ 699 AslGbl_NsLookupCount++; 700 701 Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType, 702 ACPI_IMODE_EXECUTE, Flags, WalkState, &Node); 703 if (ACPI_FAILURE (Status)) 704 { 705 if (Status == AE_NOT_FOUND) 706 { 707 /* 708 * We didn't find the name reference by path -- we can qualify this 709 * a little better before we print an error message 710 */ 711 if (strlen (Path) == ACPI_NAMESEG_SIZE) 712 { 713 /* A simple, one-segment ACPI name */ 714 715 if (XfObjectExists (Path)) 716 { 717 /* 718 * There exists such a name, but we couldn't get to it 719 * from this scope 720 */ 721 AslError (ASL_ERROR, ASL_MSG_NOT_REACHABLE, Op, 722 Op->Asl.ExternalName); 723 } 724 else 725 { 726 /* The name doesn't exist, period */ 727 728 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, 729 Op, Op->Asl.ExternalName); 730 } 731 } 732 else 733 { 734 /* The NamePath contains multiple NameSegs */ 735 736 if ((OpInfo->Flags & AML_CREATE) || 737 (OpInfo->ObjectType == ACPI_TYPE_LOCAL_ALIAS)) 738 { 739 /* 740 * The new name is the last parameter. For the 741 * CreateXXXXField and Alias operators 742 */ 743 NextOp = Op->Asl.Child; 744 while (!(NextOp->Asl.CompileFlags & OP_IS_NAME_DECLARATION)) 745 { 746 NextOp = NextOp->Asl.Next; 747 } 748 749 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, NextOp, 750 NextOp->Asl.ExternalName); 751 } 752 else if (OpInfo->Flags & AML_NAMED) 753 { 754 /* The new name is the first parameter */ 755 756 AslError (ASL_ERROR, ASL_MSG_PREFIX_NOT_EXIST, Op, 757 Op->Asl.ExternalName); 758 } 759 else if (Path[0] == AML_ROOT_PREFIX) 760 { 761 /* Full namepath from root, the object does not exist */ 762 763 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, Op, 764 Op->Asl.ExternalName); 765 } 766 else 767 { 768 /* 769 * Generic "not found" error. Cannot determine whether it 770 * doesn't exist or just can't be reached. However, we 771 * can differentiate between a NameSeg vs. NamePath. 772 */ 773 if (strlen (Op->Asl.ExternalName) == ACPI_NAMESEG_SIZE) 774 { 775 AslError (ASL_ERROR, ASL_MSG_NOT_FOUND, Op, 776 Op->Asl.ExternalName); 777 } 778 else 779 { 780 AslError (ASL_ERROR, ASL_MSG_NAMEPATH_NOT_EXIST, Op, 781 Op->Asl.ExternalName); 782 } 783 } 784 } 785 786 Status = AE_OK; 787 } 788 789 return_ACPI_STATUS (Status); 790 } 791 792 /* Check for an attempt to access an object in another method */ 793 794 if (!XfValidateCrossReference (Op, OpInfo, Node)) 795 { 796 AslError (ASL_ERROR, ASL_MSG_TEMPORARY_OBJECT, Op, 797 Op->Asl.ExternalName); 798 return_ACPI_STATUS (Status); 799 } 800 801 /* Object was found above, check for an illegal forward reference */ 802 803 if (Op->Asl.CompileFlags & OP_NOT_FOUND_DURING_LOAD) 804 { 805 /* 806 * During the load phase, this Op was flagged as a possible 807 * illegal forward reference 808 * 809 * Note: Allow "forward references" from within a method to an 810 * object that is not within any method (module-level code) 811 */ 812 if (!WalkState->ScopeInfo || (UtGetParentMethod (Node) && 813 !UtNodeIsDescendantOf (WalkState->ScopeInfo->Scope.Node, 814 UtGetParentMethod (Node)))) 815 { 816 AslError (ASL_ERROR, ASL_MSG_ILLEGAL_FORWARD_REF, Op, 817 Op->Asl.ExternalName); 818 } 819 } 820 821 /* Check for a reference vs. name declaration */ 822 823 if (!(OpInfo->Flags & AML_NAMED) && 824 !(OpInfo->Flags & AML_CREATE)) 825 { 826 /* This node has been referenced, mark it for reference check */ 827 828 Node->Flags |= ANOBJ_IS_REFERENCED; 829 } 830 831 /* Attempt to optimize the NamePath */ 832 833 OptOptimizeNamePath (Op, OpInfo->Flags, WalkState, Path, Node); 834 835 /* 836 * 1) Dereference an alias (A name reference that is an alias) 837 * Aliases are not nested, the alias always points to the final object 838 */ 839 if ((Op->Asl.ParseOpcode != PARSEOP_ALIAS) && 840 (Node->Type == ACPI_TYPE_LOCAL_ALIAS)) 841 { 842 /* This node points back to the original PARSEOP_ALIAS */ 843 844 NextOp = Node->Op; 845 846 /* The first child is the alias target op */ 847 848 NextOp = NextOp->Asl.Child; 849 850 /* That in turn points back to original target alias node */ 851 852 if (NextOp->Asl.Node) 853 { 854 Node = NextOp->Asl.Node; 855 } 856 857 /* Else - forward reference to alias, will be resolved later */ 858 } 859 860 /* 2) Check for a reference to a resource descriptor */ 861 862 if ((Node->Type == ACPI_TYPE_LOCAL_RESOURCE_FIELD) || 863 (Node->Type == ACPI_TYPE_LOCAL_RESOURCE)) 864 { 865 /* 866 * This was a reference to a field within a resource descriptor. 867 * Extract the associated field offset (either a bit or byte 868 * offset depending on the field type) and change the named 869 * reference into an integer for AML code generation 870 */ 871 Offset = Node->Value; 872 TagBitLength = Node->Length; 873 874 /* 875 * If a field is being created, generate the length (in bits) of 876 * the field. Note: Opcodes other than CreateXxxField and Index 877 * can come through here. For other opcodes, we just need to 878 * convert the resource tag reference to an integer offset. 879 */ 880 switch (Op->Asl.Parent->Asl.AmlOpcode) 881 { 882 case AML_CREATE_FIELD_OP: /* Variable "Length" field, in bits */ 883 /* 884 * We know the length operand is an integer constant because 885 * we know that it contains a reference to a resource 886 * descriptor tag. 887 */ 888 FieldBitLength = (UINT32) Op->Asl.Next->Asl.Value.Integer; 889 break; 890 891 case AML_CREATE_BIT_FIELD_OP: 892 893 FieldBitLength = 1; 894 break; 895 896 case AML_CREATE_BYTE_FIELD_OP: 897 case AML_INDEX_OP: 898 899 FieldBitLength = 8; 900 break; 901 902 case AML_CREATE_WORD_FIELD_OP: 903 904 FieldBitLength = 16; 905 break; 906 907 case AML_CREATE_DWORD_FIELD_OP: 908 909 FieldBitLength = 32; 910 break; 911 912 case AML_CREATE_QWORD_FIELD_OP: 913 914 FieldBitLength = 64; 915 break; 916 917 default: 918 919 FieldBitLength = 0; 920 break; 921 } 922 923 /* Check the field length against the length of the resource tag */ 924 925 if (FieldBitLength) 926 { 927 if (TagBitLength < FieldBitLength) 928 { 929 Message = ASL_MSG_TAG_SMALLER; 930 } 931 else if (TagBitLength > FieldBitLength) 932 { 933 Message = ASL_MSG_TAG_LARGER; 934 } 935 936 if (Message) 937 { 938 sprintf (AslGbl_MsgBuffer, 939 "Size mismatch, Tag: %u bit%s, Field: %u bit%s", 940 TagBitLength, (TagBitLength > 1) ? "s" : "", 941 FieldBitLength, (FieldBitLength > 1) ? "s" : ""); 942 943 AslError (ASL_WARNING, Message, Op, AslGbl_MsgBuffer); 944 } 945 } 946 947 /* Convert the BitOffset to a ByteOffset for certain opcodes */ 948 949 switch (Op->Asl.Parent->Asl.AmlOpcode) 950 { 951 case AML_CREATE_BYTE_FIELD_OP: 952 case AML_CREATE_WORD_FIELD_OP: 953 case AML_CREATE_DWORD_FIELD_OP: 954 case AML_CREATE_QWORD_FIELD_OP: 955 case AML_INDEX_OP: 956 957 Offset = ACPI_DIV_8 (Offset); 958 break; 959 960 default: 961 962 break; 963 } 964 965 /* Now convert this node to an integer whose value is the field offset */ 966 967 Op->Asl.AmlLength = 0; 968 Op->Asl.ParseOpcode = PARSEOP_INTEGER; 969 Op->Asl.Value.Integer = (UINT64) Offset; 970 Op->Asl.CompileFlags |= OP_IS_RESOURCE_FIELD; 971 972 OpcGenerateAmlOpcode (Op); 973 } 974 975 /* 3) Check for a method invocation */ 976 977 else if ((((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || (Op->Asl.ParseOpcode == PARSEOP_NAMESEG)) && 978 (Node->Type == ACPI_TYPE_METHOD) && 979 (Op->Asl.Parent) && 980 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_METHOD)) || 981 982 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL)) 983 { 984 /* 985 * A reference to a method within one of these opcodes is not an 986 * invocation of the method, it is simply a reference to the method. 987 * 988 * September 2016: Removed DeRefOf from this list 989 */ 990 if ((Op->Asl.Parent) && 991 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_REFOF) || 992 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_PACKAGE) || 993 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_VAR_PACKAGE)|| 994 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_OBJECTTYPE))) 995 { 996 return_ACPI_STATUS (AE_OK); 997 } 998 999 /* 1000 * There are two types of method invocation: 1001 * 1) Invocation with arguments -- the parser recognizes this 1002 * as a METHODCALL. 1003 * 2) Invocation with no arguments --the parser cannot determine that 1004 * this is a method invocation, therefore we have to figure it out 1005 * here. 1006 */ 1007 if (Node->Type != ACPI_TYPE_METHOD) 1008 { 1009 sprintf (AslGbl_MsgBuffer, "%s is a %s", 1010 Op->Asl.ExternalName, AcpiUtGetTypeName (Node->Type)); 1011 1012 AslError (ASL_ERROR, ASL_MSG_NOT_METHOD, Op, AslGbl_MsgBuffer); 1013 return_ACPI_STATUS (AE_OK); 1014 } 1015 1016 /* Save the method node in the caller's op */ 1017 1018 Op->Asl.Node = Node; 1019 if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF) 1020 { 1021 return_ACPI_STATUS (AE_OK); 1022 } 1023 1024 /* 1025 * This is a method invocation, with or without arguments. 1026 * Count the number of arguments, each appears as a child 1027 * under the parent node 1028 */ 1029 Op->Asl.ParseOpcode = PARSEOP_METHODCALL; 1030 UtSetParseOpName (Op); 1031 1032 PassedArgs = 0; 1033 NextOp = Op->Asl.Child; 1034 1035 while (NextOp) 1036 { 1037 PassedArgs++; 1038 NextOp = NextOp->Asl.Next; 1039 } 1040 1041 if (Node->Value != ASL_EXTERNAL_METHOD && 1042 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) 1043 { 1044 /* 1045 * Check the parsed arguments with the number expected by the 1046 * method declaration itself 1047 */ 1048 if (PassedArgs != Node->Value) 1049 { 1050 sprintf (AslGbl_MsgBuffer, "%s requires %u", Op->Asl.ExternalName, 1051 Node->Value); 1052 1053 if (PassedArgs < Node->Value) 1054 { 1055 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_LO, Op, AslGbl_MsgBuffer); 1056 } 1057 else 1058 { 1059 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_HI, Op, AslGbl_MsgBuffer); 1060 } 1061 } 1062 } 1063 } 1064 1065 /* 4) Check for an ASL Field definition */ 1066 1067 else if ((Op->Asl.Parent) && 1068 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_FIELD) || 1069 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_BANKFIELD))) 1070 { 1071 /* 1072 * Offset checking for fields. If the parent operation region has a 1073 * constant length (known at compile time), we can check fields 1074 * defined in that region against the region length. This will catch 1075 * fields and field units that cannot possibly fit within the region. 1076 * 1077 * Note: Index fields do not directly reference an operation region, 1078 * thus they are not included in this check. 1079 */ 1080 if (Op == Op->Asl.Parent->Asl.Child) 1081 { 1082 /* 1083 * This is the first child of the field node, which is 1084 * the name of the region. Get the parse node for the 1085 * region -- which contains the length of the region. 1086 */ 1087 OwningOp = Node->Op; 1088 Op->Asl.Parent->Asl.ExtraValue = 1089 ACPI_MUL_8 ((UINT32) OwningOp->Asl.Value.Integer); 1090 1091 /* Examine the field access width */ 1092 1093 switch ((UINT8) Op->Asl.Parent->Asl.Value.Integer) 1094 { 1095 case AML_FIELD_ACCESS_ANY: 1096 case AML_FIELD_ACCESS_BYTE: 1097 case AML_FIELD_ACCESS_BUFFER: 1098 default: 1099 1100 MinimumLength = 1; 1101 break; 1102 1103 case AML_FIELD_ACCESS_WORD: 1104 1105 MinimumLength = 2; 1106 break; 1107 1108 case AML_FIELD_ACCESS_DWORD: 1109 1110 MinimumLength = 4; 1111 break; 1112 1113 case AML_FIELD_ACCESS_QWORD: 1114 1115 MinimumLength = 8; 1116 break; 1117 } 1118 1119 /* 1120 * Is the region at least as big as the access width? 1121 * Note: DataTableRegions have 0 length 1122 */ 1123 if (((UINT32) OwningOp->Asl.Value.Integer) && 1124 ((UINT32) OwningOp->Asl.Value.Integer < MinimumLength)) 1125 { 1126 AslError (ASL_ERROR, ASL_MSG_FIELD_ACCESS_WIDTH, Op, NULL); 1127 } 1128 1129 /* 1130 * Check EC/CMOS/SMBUS fields to make sure that the correct 1131 * access type is used (BYTE for EC/CMOS, BUFFER for SMBUS) 1132 */ 1133 SpaceIdOp = OwningOp->Asl.Child->Asl.Next; 1134 switch ((UINT32) SpaceIdOp->Asl.Value.Integer) 1135 { 1136 case ACPI_ADR_SPACE_EC: 1137 case ACPI_ADR_SPACE_CMOS: 1138 case ACPI_ADR_SPACE_GPIO: 1139 1140 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1141 AML_FIELD_ACCESS_BYTE) 1142 { 1143 AslError (ASL_ERROR, ASL_MSG_REGION_BYTE_ACCESS, Op, NULL); 1144 } 1145 break; 1146 1147 case ACPI_ADR_SPACE_SMBUS: 1148 case ACPI_ADR_SPACE_IPMI: 1149 case ACPI_ADR_SPACE_GSBUS: 1150 1151 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != 1152 AML_FIELD_ACCESS_BUFFER) 1153 { 1154 AslError (ASL_ERROR, ASL_MSG_REGION_BUFFER_ACCESS, Op, NULL); 1155 } 1156 break; 1157 1158 default: 1159 1160 /* Nothing to do for other address spaces */ 1161 1162 break; 1163 } 1164 } 1165 else 1166 { 1167 /* 1168 * This is one element of the field list. Check to make sure 1169 * that it does not go beyond the end of the parent operation region. 1170 * 1171 * In the code below: 1172 * Op->Asl.Parent->Asl.ExtraValue - Region Length (bits) 1173 * Op->Asl.ExtraValue - Field start offset (bits) 1174 * Op->Asl.Child->Asl.Value.Integer32 - Field length (bits) 1175 * Op->Asl.Child->Asl.ExtraValue - Field access width (bits) 1176 */ 1177 if (Op->Asl.Parent->Asl.ExtraValue && Op->Asl.Child) 1178 { 1179 XfCheckFieldRange (Op, 1180 Op->Asl.Parent->Asl.ExtraValue, 1181 Op->Asl.ExtraValue, 1182 (UINT32) Op->Asl.Child->Asl.Value.Integer, 1183 Op->Asl.Child->Asl.ExtraValue); 1184 } 1185 } 1186 } 1187 1188 /* 1189 * 5) Check for external resolution 1190 * By this point, everything should be loaded in the namespace. If a 1191 * namespace lookup results in a namespace node that is an external, it 1192 * means that this named object was not defined in the input ASL. This 1193 * causes issues because there are plenty of incidents where developers 1194 * use the external keyword to suppress compiler errors about undefined 1195 * objects. Note: this only applies when compiling multiple definition 1196 * blocks. 1197 */ 1198 if (AslGbl_ParseTreeRoot->Asl.Child && AslGbl_ParseTreeRoot->Asl.Child->Asl.Next && 1199 (Op->Asl.ParseOpcode != PARSEOP_EXTERNAL && 1200 Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_EXTERNAL) && 1201 (Node->Flags & ANOBJ_IS_EXTERNAL)) 1202 { 1203 AslError (ASL_ERROR, ASL_MSG_UNDEFINED_EXTERNAL, Op, NULL); 1204 } 1205 1206 /* 5) Check for a connection object */ 1207 #if 0 1208 else if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONNECTION) 1209 { 1210 return_ACPI_STATUS (Status); 1211 } 1212 #endif 1213 1214 Op->Asl.Node = Node; 1215 return_ACPI_STATUS (Status); 1216 } 1217 1218 1219 /******************************************************************************* 1220 * 1221 * FUNCTION: XfNamespaceLocateEnd 1222 * 1223 * PARAMETERS: ASL_WALK_CALLBACK 1224 * 1225 * RETURN: Status 1226 * 1227 * DESCRIPTION: Ascending callback used during cross reference. We only 1228 * need to worry about scope management here. 1229 * 1230 ******************************************************************************/ 1231 1232 static ACPI_STATUS 1233 XfNamespaceLocateEnd ( 1234 ACPI_PARSE_OBJECT *Op, 1235 UINT32 Level, 1236 void *Context) 1237 { 1238 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context; 1239 const ACPI_OPCODE_INFO *OpInfo; 1240 1241 1242 ACPI_FUNCTION_TRACE (XfNamespaceLocateEnd); 1243 1244 1245 /* We are only interested in opcodes that have an associated name */ 1246 1247 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode); 1248 if (!(OpInfo->Flags & AML_NAMED)) 1249 { 1250 return_ACPI_STATUS (AE_OK); 1251 } 1252 1253 /* Not interested in name references, we did not open a scope for them */ 1254 1255 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || 1256 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) || 1257 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL) || 1258 (Op->Asl.ParseOpcode == PARSEOP_EXTERNAL)) 1259 { 1260 return_ACPI_STATUS (AE_OK); 1261 } 1262 1263 /* Pop the scope stack if necessary */ 1264 1265 if (AcpiNsOpensScope (AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode))) 1266 { 1267 1268 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, 1269 "%s: Popping scope for Op %p\n", 1270 AcpiUtGetTypeName (OpInfo->ObjectType), Op)); 1271 1272 (void) AcpiDsScopeStackPop (WalkState); 1273 } 1274 1275 return_ACPI_STATUS (AE_OK); 1276 } 1277 1278 1279 /******************************************************************************* 1280 * 1281 * FUNCTION: XfValidateCrossReference 1282 * 1283 * PARAMETERS: Op - Parse Op that references the object 1284 * OpInfo - Parse Op info struct 1285 * Node - Node for the referenced object 1286 * 1287 * RETURN: TRUE if the reference is legal, FALSE otherwise 1288 * 1289 * DESCRIPTION: Determine if a reference to another object is allowed. 1290 * 1291 * EXAMPLE: 1292 * Method (A) {Name (INT1, 1)} Declaration of object INT1 1293 * Method (B) (Store (2, \A.INT1)} Illegal reference to object INT1 1294 * (INT1 is temporary, valid only during 1295 * execution of A) 1296 * 1297 * NOTES: 1298 * A null pointer returned by either XfGetParentMethod or 1299 * UtGetParentMethod indicates that the parameter object is not 1300 * within a control method. 1301 * 1302 * Five cases are handled: Case(Op, Node) 1303 * 1) Case(0,0): Op is not within a method, Node is not --> OK 1304 * 2) Case(0,1): Op is not within a method, but Node is --> Illegal 1305 * 3) Case(1,0): Op is within a method, Node is not --> OK 1306 * 4) Case(1,1): Both are within the same method --> OK 1307 * 5) Case(1,1): Both are in methods, but not same method --> Illegal 1308 * 1309 ******************************************************************************/ 1310 1311 static BOOLEAN 1312 XfValidateCrossReference ( 1313 ACPI_PARSE_OBJECT *Op, 1314 const ACPI_OPCODE_INFO *OpInfo, 1315 ACPI_NAMESPACE_NODE *Node) 1316 { 1317 ACPI_PARSE_OBJECT *ReferencingMethodOp; 1318 ACPI_NAMESPACE_NODE *ReferencedMethodNode; 1319 1320 1321 /* Ignore actual named (and related) object declarations */ 1322 1323 if (OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_DEFER | AML_HAS_ARGS)) 1324 { 1325 return (TRUE); 1326 } 1327 1328 /* 1329 * 1) Search upwards in parse tree for owner of the referencing object 1330 * 2) Search upwards in namespace to find the owner of the referenced object 1331 */ 1332 ReferencingMethodOp = XfGetParentMethod (Op); 1333 ReferencedMethodNode = UtGetParentMethod (Node); 1334 1335 if (!ReferencingMethodOp && !ReferencedMethodNode) 1336 { 1337 /* 1338 * 1) Case (0,0): Both Op and Node are not within methods 1339 * --> OK 1340 */ 1341 return (TRUE); 1342 } 1343 1344 if (!ReferencingMethodOp && ReferencedMethodNode) 1345 { 1346 /* 1347 * 2) Case (0,1): Op is not in a method, but Node is within a 1348 * method --> illegal 1349 */ 1350 return (FALSE); 1351 } 1352 else if (ReferencingMethodOp && !ReferencedMethodNode) 1353 { 1354 /* 1355 * 3) Case (1,0): Op is within a method, but Node is not 1356 * --> OK 1357 */ 1358 return (TRUE); 1359 } 1360 else if (ReferencingMethodOp->Asl.Node == ReferencedMethodNode) 1361 { 1362 /* 1363 * 4) Case (1,1): Both Op and Node are within the same method 1364 * --> OK 1365 */ 1366 return (TRUE); 1367 } 1368 else 1369 { 1370 /* 1371 * 5) Case (1,1), Op and Node are in different methods 1372 * --> Illegal 1373 */ 1374 return (FALSE); 1375 } 1376 } 1377