1 /****************************************************************************** 2 * 3 * Module Name: aslopt- Compiler optimizations 4 * $Revision: 13 $ 5 * 6 *****************************************************************************/ 7 8 /****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117 118 #include "aslcompiler.h" 119 #include "aslcompiler.y.h" 120 121 #include "acparser.h" 122 #include "amlcode.h" 123 #include "acnamesp.h" 124 125 126 #define _COMPONENT ACPI_COMPILER 127 ACPI_MODULE_NAME ("aslopt") 128 129 130 UINT32 OptTotal = 0; 131 132 133 /******************************************************************************* 134 * 135 * FUNCTION: OptSearchToRoot 136 * 137 * PARAMETERS: Op - Current parser op 138 * WalkState - Current state 139 * CurrentNode - Where we are in the namespace 140 * TargetNode - Node to which we are referring 141 * TargetPath - External full path to the target node 142 * NewPath - Where the optimized path is returned 143 * 144 * RETURN: Status 145 * 146 * DESCRIPTION: Attempt to optimize a reference to a single 4-character ACPI 147 * name utilizing the search-to-root name resolution algorithm 148 * that is used by AML interpreters. 149 * 150 ******************************************************************************/ 151 152 ACPI_STATUS 153 OptSearchToRoot ( 154 ACPI_PARSE_OBJECT *Op, 155 ACPI_WALK_STATE *WalkState, 156 ACPI_NAMESPACE_NODE *CurrentNode, 157 ACPI_NAMESPACE_NODE *TargetNode, 158 ACPI_BUFFER *TargetPath, 159 char **NewPath) 160 { 161 ACPI_NAMESPACE_NODE *Node; 162 ACPI_GENERIC_STATE ScopeInfo; 163 ACPI_STATUS Status; 164 char *Path; 165 166 167 ACPI_FUNCTION_NAME ("OptSearchToRoot"); 168 169 170 /* 171 * Check if search-to-root can be utilized. Use the last NameSeg of 172 * the NamePath and 1) See if can be found and 2) If found, make 173 * sure that it is the same node that we want. If there is another 174 * name in the search path before the one we want, the nodes will 175 * not match, and we cannot use this optimization. 176 */ 177 Path = &(((char *) TargetPath->Pointer)[TargetPath->Length - ACPI_NAME_SIZE]), 178 ScopeInfo.Scope.Node = CurrentNode; 179 180 /* Lookup the NameSeg using SEARCH_PARENT (search-to-root) */ 181 182 Status = AcpiNsLookup (&ScopeInfo, Path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, 183 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, 184 WalkState, &(Node)); 185 if (ACPI_FAILURE (Status)) 186 { 187 return (Status); 188 } 189 190 /* 191 * We found the name, but we must check to make sure that the node 192 * matches. Otherwise, there is another identical name in the search 193 * path that precludes the use of this optimization. 194 */ 195 if (Node != TargetNode) 196 { 197 /* 198 * This means that another object with the same name was found first, 199 * and we cannot use this optimization. 200 */ 201 return (AE_NOT_FOUND); 202 } 203 204 /* Found the node, we can use this optimization */ 205 206 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, 207 "NAMESEG: %-24s", Path)); 208 209 /* We must allocate a new string for the name (TargetPath gets deleted) */ 210 211 *NewPath = ACPI_MEM_CALLOCATE (ACPI_NAME_SIZE + 1); 212 ACPI_STRCPY (*NewPath, Path); 213 214 AslError (ASL_OPTIMIZATION, ASL_MSG_SINGLE_NAME_OPTIMIZATION, Op, 215 *NewPath); 216 217 return (AE_OK); 218 } 219 220 221 /******************************************************************************* 222 * 223 * FUNCTION: OptBuildShortestPath 224 * 225 * PARAMETERS: Op - Current parser op 226 * WalkState - Current state 227 * CurrentNode - Where we are in the namespace 228 * TargetNode - Node to which we are referring 229 * CurrentPath - External full path to the current node 230 * TargetPath - External full path to the target node 231 * AmlNameStringLength - Length of the original namepath 232 * IsDeclaration - TRUE for declaration, FALSE for reference 233 * ReturnNewPath - Where the optimized path is returned 234 * 235 * RETURN: Status 236 * 237 * DESCRIPTION: Build an optimal NamePath using carats 238 * 239 ******************************************************************************/ 240 241 ACPI_STATUS 242 OptBuildShortestPath ( 243 ACPI_PARSE_OBJECT *Op, 244 ACPI_WALK_STATE *WalkState, 245 ACPI_NAMESPACE_NODE *CurrentNode, 246 ACPI_NAMESPACE_NODE *TargetNode, 247 ACPI_BUFFER *CurrentPath, 248 ACPI_BUFFER *TargetPath, 249 ACPI_SIZE AmlNameStringLength, 250 UINT8 IsDeclaration, 251 char **ReturnNewPath) 252 { 253 UINT32 NumCommonSegments; 254 UINT32 MaxCommonSegments; 255 ACPI_NATIVE_UINT Index; 256 UINT32 NumCarats; 257 ACPI_NATIVE_UINT i; 258 char *NewPath; 259 char *NewPathExternal; 260 ACPI_NAMESPACE_NODE *Node; 261 ACPI_GENERIC_STATE ScopeInfo; 262 ACPI_STATUS Status; 263 BOOLEAN SubPath = FALSE; 264 265 266 ACPI_FUNCTION_NAME ("OptBuildShortestPath"); 267 268 269 ScopeInfo.Scope.Node = CurrentNode; 270 271 /* 272 * Determine the maximum number of NameSegs that the Target and Current paths 273 * can possibly have in common. (To optimize, we have to have at least 1) 274 * 275 * Note: The external NamePath string lengths are always a multiple of 5 276 * (ACPI_NAME_SIZE + separator) 277 */ 278 MaxCommonSegments = TargetPath->Length / ACPI_PATH_SEGMENT_LENGTH; 279 if (CurrentPath->Length < TargetPath->Length) 280 { 281 MaxCommonSegments = CurrentPath->Length / ACPI_PATH_SEGMENT_LENGTH; 282 } 283 284 /* 285 * Determine how many NameSegs the two paths have in common. 286 * (Starting from the root) 287 */ 288 for (NumCommonSegments = 0; 289 NumCommonSegments < MaxCommonSegments; 290 NumCommonSegments++) 291 { 292 /* Compare two single NameSegs */ 293 294 if (ACPI_STRNCMP ( 295 &((char *) TargetPath->Pointer)[(NumCommonSegments * ACPI_PATH_SEGMENT_LENGTH) + 1], 296 &((char *) CurrentPath->Pointer)[(NumCommonSegments * ACPI_PATH_SEGMENT_LENGTH) + 1], 297 ACPI_NAME_SIZE)) 298 { 299 /* Mismatch */ 300 301 break; 302 } 303 } 304 305 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " COMMON: %d", NumCommonSegments)); 306 307 /* There must be at least 1 common NameSeg in order to optimize */ 308 309 if (NumCommonSegments == 0) 310 { 311 return (AE_NOT_FOUND); 312 } 313 314 if (NumCommonSegments == MaxCommonSegments) 315 { 316 if (CurrentPath->Length == TargetPath->Length) 317 { 318 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " SAME PATH")); 319 return (AE_NOT_FOUND); 320 } 321 else 322 { 323 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " SUBPATH")); 324 SubPath = TRUE; 325 } 326 } 327 328 /* Determine how many prefix Carats are required */ 329 330 NumCarats = (CurrentPath->Length / ACPI_PATH_SEGMENT_LENGTH) - NumCommonSegments; 331 332 /* 333 * Construct a new target string 334 */ 335 NewPathExternal = ACPI_MEM_CALLOCATE (TargetPath->Length + NumCarats); 336 337 /* Insert the Carats into the Target string */ 338 339 for (i = 0; i < NumCarats; i++) 340 { 341 NewPathExternal[i] = '^'; 342 } 343 344 /* Copy only the necessary (optimal) segments from the original target string */ 345 346 Index = (NumCommonSegments * ACPI_PATH_SEGMENT_LENGTH) + 1; 347 348 /* Special handling for exact subpath in a name declaration */ 349 350 if (IsDeclaration && SubPath && (CurrentPath->Length > TargetPath->Length)) 351 { 352 /* 353 * The current path is longer than the target, and the target is a subpath 354 * of the current path. We must include one more NameSeg of the target path 355 */ 356 Index -= ACPI_PATH_SEGMENT_LENGTH; 357 } 358 359 ACPI_STRCPY (&NewPathExternal[i], &((char *) TargetPath->Pointer)[Index]); 360 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " %-24s", NewPathExternal)); 361 362 /* 363 * Internalize the new target string and check it against the original string 364 * to make sure that this is in fact an optimization. If the original string 365 * is already optimal, there is no point in continuing. 366 */ 367 Status = AcpiNsInternalizeName (NewPathExternal, &NewPath); 368 369 if (ACPI_FAILURE (Status)) 370 { 371 AslCoreSubsystemError (Op, Status, "Internalizing new NamePath", ASL_NO_ABORT); 372 ACPI_MEM_FREE (NewPathExternal); 373 return (Status); 374 } 375 376 if (ACPI_STRLEN (NewPath) >= AmlNameStringLength) 377 { 378 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " NOT SHORTER (New %d old %d)", 379 ACPI_STRLEN (NewPath), AmlNameStringLength)); 380 ACPI_MEM_FREE (NewPathExternal); 381 return (AE_NOT_FOUND); 382 } 383 384 /* 385 * Check to make sure that the optimization finds the node we are 386 * looking for. This is simply a sanity check on the new 387 * path that has been created. 388 */ 389 Status = AcpiNsLookup (&ScopeInfo, NewPath, 390 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, 391 ACPI_NS_DONT_OPEN_SCOPE, WalkState, &(Node)); 392 if (ACPI_SUCCESS (Status)) 393 { 394 /* Found the namepath, but make sure the node is correct */ 395 396 if (Node == TargetNode) 397 { 398 /* The lookup matched the node, accept this optimization */ 399 400 AslError (ASL_OPTIMIZATION, ASL_MSG_NAME_OPTIMIZATION, 401 Op, NewPathExternal); 402 *ReturnNewPath = NewPath; 403 } 404 else 405 { 406 /* Node is not correct, do not use this optimization */ 407 408 Status = AE_NOT_FOUND; 409 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ***** WRONG NODE")); 410 AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op, 411 "Not using optimized name - found wrong node"); 412 } 413 } 414 else 415 { 416 /* The lookup failed, we obviously cannot use this optimization */ 417 418 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ***** NOT FOUND")); 419 AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op, 420 "Not using optimized name - did not find node"); 421 } 422 423 ACPI_MEM_FREE (NewPathExternal); 424 return (Status); 425 } 426 427 428 /******************************************************************************* 429 * 430 * FUNCTION: OptOptimizeNameDeclaration 431 * 432 * PARAMETERS: Op - Current parser op 433 * WalkState - Current state 434 * CurrentNode - Where we are in the namespace 435 * AmlNameString - Unoptimized namepath 436 * NewPath - Where the optimized path is returned 437 * 438 * RETURN: Status. AE_OK If path is optimized 439 * 440 * DESCRIPTION: Perform a simple optimization of removing an extraneous 441 * backslash prefix if we are already at the root scope. 442 * 443 ******************************************************************************/ 444 445 ACPI_STATUS 446 OptOptimizeNameDeclaration ( 447 ACPI_PARSE_OBJECT *Op, 448 ACPI_WALK_STATE *WalkState, 449 ACPI_NAMESPACE_NODE *CurrentNode, 450 ACPI_NAMESPACE_NODE *TargetNode, 451 char *AmlNameString, 452 char **NewPath) 453 { 454 ACPI_STATUS Status; 455 char *NewPathExternal; 456 ACPI_GENERIC_STATE ScopeInfo; 457 ACPI_NAMESPACE_NODE *Node; 458 459 460 ACPI_FUNCTION_TRACE ("OptOptimizeNameDeclaration"); 461 462 463 if (((CurrentNode == AcpiGbl_RootNode) || 464 (Op->Common.Parent->Asl.ParseOpcode == PARSEOP_DEFINITIONBLOCK)) && 465 (AmlNameString[0] == '\\')) 466 { 467 /* 468 * The current scope is the root, and the namepath has a root prefix 469 * that is therefore extraneous. Remove it. 470 */ 471 *NewPath = &AmlNameString[1]; 472 473 /* Debug output */ 474 475 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, *NewPath, 476 NULL, &NewPathExternal); 477 if (ACPI_FAILURE (Status)) 478 { 479 AslCoreSubsystemError (Op, Status, "Externalizing NamePath", ASL_NO_ABORT); 480 return (Status); 481 } 482 483 /* 484 * Check to make sure that the optimization finds the node we are 485 * looking for. This is simply a sanity check on the new 486 * path that has been created. 487 */ 488 ScopeInfo.Scope.Node = CurrentNode; 489 Status = AcpiNsLookup (&ScopeInfo, *NewPath, 490 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, 491 ACPI_NS_DONT_OPEN_SCOPE, WalkState, &(Node)); 492 if (ACPI_SUCCESS (Status)) 493 { 494 /* Found the namepath, but make sure the node is correct */ 495 496 if (Node == TargetNode) 497 { 498 /* The lookup matched the node, accept this optimization */ 499 500 AslError (ASL_OPTIMIZATION, ASL_MSG_NAME_OPTIMIZATION, 501 Op, NewPathExternal); 502 503 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, 504 "AT ROOT: %-24s", NewPathExternal)); 505 } 506 else 507 { 508 /* Node is not correct, do not use this optimization */ 509 510 Status = AE_NOT_FOUND; 511 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ***** WRONG NODE")); 512 AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op, 513 "Not using optimized name - found wrong node"); 514 } 515 } 516 else 517 { 518 /* The lookup failed, we obviously cannot use this optimization */ 519 520 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ***** NOT FOUND")); 521 AslError (ASL_WARNING, ASL_MSG_COMPILER_INTERNAL, Op, 522 "Not using optimized name - did not find node"); 523 } 524 525 ACPI_MEM_FREE (NewPathExternal); 526 return (Status); 527 } 528 529 /* Could not optimize */ 530 531 return (AE_NOT_FOUND); 532 } 533 534 535 /******************************************************************************* 536 * 537 * FUNCTION: OptOptimizeNamePath 538 * 539 * PARAMETERS: Op - Current parser op 540 * Flags - Opcode info flags 541 * WalkState - Current state 542 * AmlNameString - Unoptimized namepath 543 * TargetNode - Node to which AmlNameString refers 544 * 545 * RETURN: None. If path is optimized, the Op is updated with new path 546 * 547 * DESCRIPTION: Optimize a Named Declaration or Reference to the minimal length. 548 * Must take into account both the current location in the 549 * namespace and the actual reference path. 550 * 551 ******************************************************************************/ 552 553 void 554 OptOptimizeNamePath ( 555 ACPI_PARSE_OBJECT *Op, 556 UINT32 Flags, 557 ACPI_WALK_STATE *WalkState, 558 char *AmlNameString, 559 ACPI_NAMESPACE_NODE *TargetNode) 560 { 561 ACPI_STATUS Status; 562 ACPI_BUFFER TargetPath; 563 ACPI_BUFFER CurrentPath; 564 ACPI_SIZE AmlNameStringLength; 565 ACPI_NAMESPACE_NODE *CurrentNode; 566 char *ExternalNameString; 567 char *NewPath = NULL; 568 ACPI_SIZE HowMuchShorter; 569 ACPI_PARSE_OBJECT *NextOp; 570 571 572 ACPI_FUNCTION_TRACE ("OptOptimizeNamePath"); 573 574 575 /* This is an optional optimization */ 576 577 if (!Gbl_ReferenceOptimizationFlag) 578 { 579 return_VOID; 580 } 581 582 /* Various required items */ 583 584 if (!TargetNode || !WalkState || !Op->Common.Parent) 585 { 586 return_VOID; 587 } 588 589 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "%5d [%12.12s] [%12.12s] ", 590 Op->Asl.LogicalLineNumber, 591 AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), 592 AcpiPsGetOpcodeName (Op->Common.AmlOpcode))); 593 594 if (!(Flags & (AML_NAMED | AML_CREATE))) 595 { 596 if (Op->Asl.CompileFlags & NODE_IS_NAME_DECLARATION) 597 { 598 /* We don't want to fuss with actual name declaration nodes here */ 599 600 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, 601 "******* NAME DECLARATION\n")); 602 return_VOID; 603 } 604 } 605 606 /* 607 * The original path must be longer than one NameSeg (4 chars) for there 608 * to be any possibility that it can be optimized to a shorter string 609 */ 610 AmlNameStringLength = ACPI_STRLEN (AmlNameString); 611 if (AmlNameStringLength <= ACPI_NAME_SIZE) 612 { 613 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, 614 "NAMESEG %4.4s\n", AmlNameString)); 615 return_VOID; 616 } 617 618 /* 619 * We need to obtain the node that represents the current scope -- where 620 * we are right now in the namespace. We will compare this path 621 * against the Namepath, looking for commonality. 622 */ 623 CurrentNode = AcpiGbl_RootNode; 624 if (WalkState->ScopeInfo) 625 { 626 CurrentNode = WalkState->ScopeInfo->Scope.Node; 627 } 628 629 if (Flags & (AML_NAMED | AML_CREATE)) 630 { 631 /* This is the declaration of a new name */ 632 633 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "NAME")); 634 635 /* The node of interest is the parent of this node (the containing scope) */ 636 637 CurrentNode = Op->Asl.Parent->Asl.Node; 638 if (!CurrentNode) 639 { 640 CurrentNode = AcpiGbl_RootNode; 641 } 642 } 643 else 644 { 645 /* This is a reference to an existing named object */ 646 647 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "REF ")); 648 } 649 650 /* 651 * Obtain the full paths to the two nodes that we are interested in 652 * (Target and current namespace location) in external 653 * format -- something we can easily manipulate 654 */ 655 TargetPath.Length = ACPI_ALLOCATE_LOCAL_BUFFER; 656 Status = AcpiNsHandleToPathname (TargetNode, &TargetPath); 657 if (ACPI_FAILURE (Status)) 658 { 659 AslCoreSubsystemError (Op, Status, "Getting Target NamePath", ASL_NO_ABORT); 660 return_VOID; 661 } 662 TargetPath.Length--; /* Subtract one for null terminator */ 663 664 /* CurrentPath is the path to this scope (where we are in the namespace) */ 665 666 CurrentPath.Length = ACPI_ALLOCATE_LOCAL_BUFFER; 667 Status = AcpiNsHandleToPathname (CurrentNode, &CurrentPath); 668 if (ACPI_FAILURE (Status)) 669 { 670 AslCoreSubsystemError (Op, Status, "Getting Current NamePath", ASL_NO_ABORT); 671 return_VOID; 672 } 673 CurrentPath.Length--; /* Subtract one for null terminator */ 674 675 /* Debug output only */ 676 677 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, AmlNameString, 678 NULL, &ExternalNameString); 679 if (ACPI_FAILURE (Status)) 680 { 681 AslCoreSubsystemError (Op, Status, "Externalizing NamePath", ASL_NO_ABORT); 682 return_VOID; 683 } 684 685 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, 686 "%37s (%2d) ==> %-32s(%2d) %-32s", 687 (char *) CurrentPath.Pointer, CurrentPath.Length, 688 (char *) TargetPath.Pointer, TargetPath.Length, ExternalNameString)); 689 690 ACPI_MEM_FREE (ExternalNameString); 691 692 /* 693 * Attempt an optmization depending on the type of namepath 694 */ 695 if (Flags & (AML_NAMED | AML_CREATE)) 696 { 697 /* 698 * This is a named opcode and the namepath is a name declaration, not 699 * a reference. 700 */ 701 Status = OptOptimizeNameDeclaration (Op, WalkState, CurrentNode, 702 TargetNode, AmlNameString, &NewPath); 703 if (ACPI_FAILURE (Status)) 704 { 705 /* 706 * 2) now attempt to 707 * optimize the namestring with carats (up-arrow) 708 */ 709 Status = OptBuildShortestPath (Op, WalkState, CurrentNode, 710 TargetNode, &CurrentPath, &TargetPath, 711 AmlNameStringLength, 1, &NewPath); 712 } 713 } 714 else 715 { 716 /* 717 * This is a reference to an existing named object 718 * 719 * 1) Check if search-to-root can be utilized using the last 720 * NameSeg of the NamePath 721 */ 722 Status = OptSearchToRoot (Op, WalkState, CurrentNode, 723 TargetNode, &TargetPath, &NewPath); 724 if (ACPI_FAILURE (Status)) 725 { 726 /* 727 * 2) Search-to-root could not be used, now attempt to 728 * optimize the namestring with carats (up-arrow) 729 */ 730 Status = OptBuildShortestPath (Op, WalkState, CurrentNode, 731 TargetNode, &CurrentPath, &TargetPath, 732 AmlNameStringLength, 0, &NewPath); 733 } 734 } 735 736 /* 737 * Success from above indicates that the NamePath was successfully 738 * optimized. We need to update the parse op with the new name 739 */ 740 if (ACPI_SUCCESS (Status)) 741 { 742 HowMuchShorter = (AmlNameStringLength - ACPI_STRLEN (NewPath)); 743 OptTotal += HowMuchShorter; 744 745 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " REDUCED %2d (%d)", 746 HowMuchShorter, OptTotal)); 747 748 if (Flags & AML_NAMED) 749 { 750 if (Op->Asl.AmlOpcode == AML_ALIAS_OP) 751 { 752 /* 753 * ALIAS is the only oddball opcode, the name declaration 754 * (alias name) is the second operand 755 */ 756 Op->Asl.Child->Asl.Next->Asl.Value.String = NewPath; 757 Op->Asl.Child->Asl.Next->Asl.AmlLength = ACPI_STRLEN (NewPath); 758 } 759 else 760 { 761 Op->Asl.Child->Asl.Value.String = NewPath; 762 Op->Asl.Child->Asl.AmlLength = ACPI_STRLEN (NewPath); 763 } 764 } 765 else if (Flags & AML_CREATE) 766 { 767 /* Name must appear as the last parameter */ 768 769 NextOp = Op->Asl.Child; 770 while (!(NextOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION)) 771 { 772 NextOp = NextOp->Asl.Next; 773 } 774 /* Update the parse node with the new NamePath */ 775 776 NextOp->Asl.Value.String = NewPath; 777 NextOp->Asl.AmlLength = ACPI_STRLEN (NewPath); 778 } 779 else 780 { 781 /* Update the parse node with the new NamePath */ 782 783 Op->Asl.Value.String = NewPath; 784 Op->Asl.AmlLength = ACPI_STRLEN (NewPath); 785 } 786 } 787 else 788 { 789 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, " ALREADY OPTIMAL")); 790 } 791 792 /* Cleanup path buffers */ 793 794 ACPI_MEM_FREE (TargetPath.Pointer); 795 ACPI_MEM_FREE (CurrentPath.Pointer); 796 797 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OPTIMIZATIONS, "\n")); 798 return_VOID; 799 } 800 801