Differences From Artifact [eb9e1d7c01]:
- File src/runtime/exception.m — part of check-in [0509d7a844] at 2019-01-03 19:13:03 on branch trunk — Update copyright (user: js, size: 19958) [annotate] [blame] [check-ins using]
To Artifact [3d1d7d2d6b]:
- File
src/runtime/exception.m
— part of check-in
[ef6d69931e]
at
2019-02-07 00:46:41
on branch trunk
— Make style consistent between ObjFW and ObjFW_RT
ObjFW_RT used to be a separate project that followed the BSD style, as
it was written in pure C, while ObjFW's style is based on the BSD style
with changes to make it a better fit for Objective-C. This commit
changes ObjFW_RT to use the same style as ObjFW. (user: js, size: 19857) [annotate] [blame] [check-ins using]
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52 53 54 55 56 57 58 | #if defined(OF_ARM) && !defined(__ARM_DWARF_EH__) # define HAVE_ARM_EHABI_EXCEPTIONS #endif #ifndef HAVE_ARM_EHABI_EXCEPTIONS # define PERSONALITY_FUNC(func) \ _Unwind_Reason_Code \ | | | | 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | #if defined(OF_ARM) && !defined(__ARM_DWARF_EH__) # define HAVE_ARM_EHABI_EXCEPTIONS #endif #ifndef HAVE_ARM_EHABI_EXCEPTIONS # define PERSONALITY_FUNC(func) \ _Unwind_Reason_Code \ func(int version, int actions, uint64_t exClass, \ struct _Unwind_Exception *ex, struct _Unwind_Context *ctx) # define CALL_PERSONALITY(func) func(version, actions, exClass, ex, ctx) #else # define PERSONALITY_FUNC(func) \ _Unwind_Reason_Code \ func(uint32_t state, struct _Unwind_Exception *ex, \ struct _Unwind_Context *ctx) # define CALL_PERSONALITY(func) func(state, ex, ctx) #endif |
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132 133 134 135 136 137 138 | uint64_t private[6]; # endif #else /* From "Exception Handling ABI for the ARM(R) Architecture" */ struct { uint32_t reserved1, reserved2, reserved3, reserved4; uint32_t reserved; | | | | | | | | | | | | | | 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | uint64_t private[6]; # endif #else /* From "Exception Handling ABI for the ARM(R) Architecture" */ struct { uint32_t reserved1, reserved2, reserved3, reserved4; uint32_t reserved; } unwinderCache; struct { uint32_t sp; uint32_t bitPattern[5]; } barrierCache; struct { uint32_t bitPattern[4]; } cleanupCache; struct { uint32_t fnstart; uint32_t *ehtp; uint32_t additional; uint32_t reserved1; } PRCache; long long int : 0; #endif } exception; id object; #ifndef HAVE_ARM_EHABI_EXCEPTIONS uintptr_t landingpad; intptr_t filter; #endif }; struct lsda { uintptr_t regionStart, landingpadsStart; uint8_t typesTableEnc; const uint8_t *typesTable; uintptr_t typesTableBase; uint8_t callsitesEnc; const uint8_t *callsites, *actionTable; }; extern _Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception *); extern void _Unwind_DeleteException(struct _Unwind_Exception *); extern void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *); extern uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context *); #ifdef HAVE__UNWIND_GETDATARELBASE |
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200 201 202 203 204 205 206 | if (__gnu_unwind_frame(ex, ctx) != _URC_OK) \ return _URC_FAILURE; \ \ return _URC_CONTINUE_UNWIND; \ } static inline uintptr_t | | | | | | | | | | | | | | | | 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 | if (__gnu_unwind_frame(ex, ctx) != _URC_OK) \ return _URC_FAILURE; \ \ return _URC_CONTINUE_UNWIND; \ } static inline uintptr_t _Unwind_GetGR(struct _Unwind_Context *ctx, int regNo) { uintptr_t value; _Unwind_VRS_Get(ctx, 0, regNo, 0, &value); return value; } static inline uintptr_t _Unwind_GetIP(struct _Unwind_Context *ctx) { return _Unwind_GetGR(ctx, 15) & ~1; } static inline void _Unwind_SetGR(struct _Unwind_Context *ctx, int regNo, uintptr_t value) { _Unwind_VRS_Set(ctx, 0, regNo, 0, &value); } static inline void _Unwind_SetIP(struct _Unwind_Context *ctx, uintptr_t value) { uintptr_t thumb = _Unwind_GetGR(ctx, 15) & 1; _Unwind_SetGR(ctx, 15, (value | thumb)); } #endif #ifdef CXX_PERSONALITY static PERSONALITY_FUNC(cxx_personality) OF_WEAK_REF(CXX_PERSONALITY_STR); #endif #ifdef HAVE_SEH_EXCEPTIONS extern EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD, void *, PCONTEXT, PDISPATCHER_CONTEXT, _Unwind_Reason_Code (*)(int, int, uint64_t, struct _Unwind_Exception *, struct _Unwind_Context *)); #endif static objc_uncaught_exception_handler uncaughtExceptionHandler; static struct objc_exception emergencyExceptions[NUM_EMERGENCY_EXCEPTIONS]; #ifdef OF_HAVE_THREADS static of_spinlock_t emergencyExceptionsSpinlock; OF_CONSTRUCTOR() { if (!of_spinlock_new(&emergencyExceptionsSpinlock)) OBJC_ERROR("Cannot create spinlock!") } #endif static uint64_t readULEB128(const uint8_t **ptr) { uint64_t value = 0; uint8_t shift = 0; do { value |= (**ptr & 0x7F) << shift; (*ptr)++; shift += 7; } while (*(*ptr - 1) & 0x80); return value; } static int64_t readSLEB128(const uint8_t **ptr) { const uint8_t *oldPtr = *ptr; uint8_t bits; int64_t value; value = readULEB128(ptr); bits = (*ptr - oldPtr) * 7; if (bits < 64 && value & (1 << (bits - 1))) value |= -(1 << bits); return value; } static uintptr_t getBase(struct _Unwind_Context *ctx, uint8_t enc) { if (enc == DW_EH_PE_omit) return 0; switch (enc & 0x70) { case DW_EH_PE_absptr: case DW_EH_PE_pcrel: |
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310 311 312 313 314 315 316 | #endif } OBJC_ERROR("Unknown encoding!") } static size_t | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 | #endif } OBJC_ERROR("Unknown encoding!") } static size_t sizeForEncoding(uint8_t enc) { if (enc == DW_EH_PE_omit) return 0; switch (enc & 0x07) { case DW_EH_PE_absptr: return sizeof(void *); case DW_EH_PE_udata2: return 2; case DW_EH_PE_udata4: return 4; case DW_EH_PE_udata8: return 8; } OBJC_ERROR("Unknown encoding!") } static uint64_t readValue(uint8_t enc, const uint8_t **ptr) { uint64_t value; if (enc == DW_EH_PE_aligned) OBJC_ERROR("DW_EH_PE_aligned is not implemented!") #define READ(type) \ { \ type tmp; \ memcpy(&tmp, *ptr, sizeof(type)); \ value = tmp; \ *ptr += sizeForEncoding(enc); \ break; \ } switch (enc & 0x0F) { case DW_EH_PE_absptr: READ(uintptr_t) case DW_EH_PE_uleb128: value = readULEB128(ptr); break; case DW_EH_PE_udata2: READ(uint16_t) case DW_EH_PE_udata4: READ(uint32_t) case DW_EH_PE_udata8: READ(uint64_t) case DW_EH_PE_sleb128: value = readSLEB128(ptr); break; case DW_EH_PE_sdata2: READ(int16_t) case DW_EH_PE_sdata4: READ(int32_t) case DW_EH_PE_sdata8: READ(int64_t) default: OBJC_ERROR("Unknown encoding!") } #undef READ return value; } #ifndef HAVE_ARM_EHABI_EXCEPTIONS static uint64_t resolveValue(uint64_t value, uint8_t enc, const uint8_t *start, uint64_t base) { if (value == 0) return 0; value += ((enc & 0x70) == DW_EH_PE_pcrel ? (uintptr_t)start : base); if (enc & DW_EH_PE_indirect) value = *(uintptr_t *)(uintptr_t)value; return value; } #endif static void readLSDA(struct _Unwind_Context *ctx, const uint8_t *ptr, struct lsda *LSDA) { uint8_t landingpadsStartEnc; uintptr_t callsitesSize; LSDA->regionStart = _Unwind_GetRegionStart(ctx); LSDA->landingpadsStart = LSDA->regionStart; LSDA->typesTable = NULL; if ((landingpadsStartEnc = *ptr++) != DW_EH_PE_omit) LSDA->landingpadsStart = (uintptr_t)readValue(landingpadsStartEnc, &ptr); if ((LSDA->typesTableEnc = *ptr++) != DW_EH_PE_omit) { uintptr_t tmp = (uintptr_t)readULEB128(&ptr); LSDA->typesTable = ptr + tmp; } LSDA->typesTableBase = getBase(ctx, LSDA->typesTableEnc); LSDA->callsitesEnc = *ptr++; callsitesSize = (uintptr_t)readULEB128(&ptr); LSDA->callsites = ptr; LSDA->actionTable = LSDA->callsites + callsitesSize; } static bool findCallsite(struct _Unwind_Context *ctx, struct lsda *LSDA, uintptr_t *landingpad, const uint8_t **actionRecords) { uintptr_t IP = _Unwind_GetIP(ctx); const uint8_t *ptr = LSDA->callsites; *landingpad = 0; *actionRecords = NULL; #ifndef HAVE_SJLJ_EXCEPTIONS while (ptr < LSDA->actionTable) { uintptr_t callsiteStart, callsiteLength, callsiteLandingpad; uintptr_t callsiteAction; callsiteStart = LSDA->regionStart + (uintptr_t)readValue(LSDA->callsitesEnc, &ptr); callsiteLength = (uintptr_t)readValue(LSDA->callsitesEnc, &ptr); callsiteLandingpad = (uintptr_t)readValue(LSDA->callsitesEnc, &ptr); callsiteAction = (uintptr_t)readULEB128(&ptr); /* We can stop if we passed IP, as the table is sorted */ if (callsiteStart >= IP) break; if (callsiteStart + callsiteLength >= IP) { if (callsiteLandingpad != 0) *landingpad = LSDA->landingpadsStart + callsiteLandingpad; if (callsiteAction != 0) *actionRecords = LSDA->actionTable + callsiteAction - 1; return true; } } return false; #else uintptr_t callsiteLandingpad, callsiteAction; if ((intptr_t)ip < 1) return false; do { callsiteLandingpad = (uintptr_t)readULEB128(&ptr); callsiteAction = (uintptr_t)readULEB128(&ptr); } while (--ip > 1); *landingpad = callsiteLandingpad + 1; if (callsiteAction != 0) *actionRecords = LSDA->actionTable + callsiteAction - 1; return true; #endif } static bool classMatches(Class class, id object) { Class iter; if (class == Nil) return true; if (object == nil) return false; for (iter = object_getClass(object); iter != Nil; iter = class_getSuperclass(iter)) if (iter == class) return true; return false; } static uint8_t findActionRecord(const uint8_t *actionRecords, struct lsda *LSDA, int actions, bool foreign, struct objc_exception *e, intptr_t *filterPtr) { const uint8_t *ptr; intptr_t filter, displacement; do { ptr = actionRecords; filter = (intptr_t)readSLEB128(&ptr); /* * Get the next action record. Since readSLEB128() modifies ptr, * we first set the actionrecord to the current ptr and then * add the displacement. */ actionRecords = ptr; displacement = (intptr_t)readSLEB128(&ptr); actionRecords += displacement; if (filter > 0 && !(actions & _UA_FORCE_UNWIND) && !foreign) { Class class; const char *className; uintptr_t c; const uint8_t *tmp; #ifndef HAVE_ARM_EHABI_EXCEPTIONS uintptr_t i; i = filter * sizeForEncoding(LSDA->typesTableEnc); tmp = LSDA->typesTable - i; c = (uintptr_t)readValue(LSDA->typesTableEnc, &tmp); c = (uintptr_t)resolveValue(c, LSDA->typesTableEnc, LSDA->typesTable - i, LSDA->typesTableBase); #else tmp = LSDA->typesTable - (filter * 4); c = *(uintptr_t *)(void *)tmp; if (c != 0) { c += (uintptr_t)tmp; # if defined(OF_LINUX) || defined(OF_NETBSD) c = *(uintptr_t *)c; # endif } #endif className = (const char *)c; if (className != NULL && *className != '\0' && strcmp(className, "@id") != 0) class = objc_getRequiredClass(className); else class = Nil; if (classMatches(class, e->object)) { *filterPtr = filter; return HANDLER_FOUND; } } else if (filter == 0) return CLEANUP_FOUND; else if (filter < 0) OBJC_ERROR("Invalid filter!") } while (displacement != 0); return 0; } #ifdef HAVE_SEH_EXCEPTIONS static #endif PERSONALITY_FUNC(PERSONALITY) { #ifdef HAVE_ARM_EHABI_EXCEPTIONS int version = 1; uint64_t exClass = ex->class; int actions; switch (state) { case 0: /* _US_VIRTUAL_UNWIND_FRAME */ actions = _UA_SEARCH_PHASE; break; case 1: /* _US_UNWIND_FRAME_STARTING */ actions = _UA_CLEANUP_PHASE; if ((ex->barrierCache.sp == _Unwind_GetGR(ctx, 13)) != 0) actions |= _UA_HANDLER_FRAME; break; case 2: /* _US_UNWIND_FRAME_RESUME */ CONTINUE_UNWIND; default: return _URC_FAILURE; } _Unwind_SetGR(ctx, 12, (uintptr_t)ex); #endif struct objc_exception *e = (struct objc_exception *)ex; bool foreign = (exClass != GNUCOBJC_EXCEPTION_CLASS); const uint8_t *LSDAAddr, *actionRecords; struct lsda LSDA; uintptr_t landingpad = 0; uint8_t found = 0; intptr_t filter = 0; if (foreign) { switch (exClass) { #ifdef CXX_PERSONALITY case GNUCCXX0_EXCEPTION_CLASS: case CLNGCXX0_EXCEPTION_CLASS: if (cxx_personality != NULL) return CALL_PERSONALITY(cxx_personality); break; #endif |
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634 635 636 637 638 639 640 | (uintptr_t)e->object); #ifndef HAVE_ARM_EHABI_EXCEPTIONS _Unwind_SetGR(ctx, __builtin_eh_return_data_regno(1), e->filter); _Unwind_SetIP(ctx, e->landingpad); #else _Unwind_SetGR(ctx, __builtin_eh_return_data_regno(1), | | | | | | | | | | | | 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 | (uintptr_t)e->object); #ifndef HAVE_ARM_EHABI_EXCEPTIONS _Unwind_SetGR(ctx, __builtin_eh_return_data_regno(1), e->filter); _Unwind_SetIP(ctx, e->landingpad); #else _Unwind_SetGR(ctx, __builtin_eh_return_data_regno(1), ex->barrierCache.bitPattern[1]); _Unwind_SetIP(ctx, ex->barrierCache.bitPattern[3]); #endif _Unwind_DeleteException(ex); return _URC_INSTALL_CONTEXT; } /* No LSDA -> nothing to handle */ if ((LSDAAddr = _Unwind_GetLanguageSpecificData(ctx)) == NULL) CONTINUE_UNWIND; readLSDA(ctx, LSDAAddr, &LSDA); if (!findCallsite(ctx, &LSDA, &landingpad, &actionRecords)) CONTINUE_UNWIND; if (landingpad != 0 && actionRecords != NULL) found = findActionRecord(actionRecords, &LSDA, actions, foreign, e, &filter); else if (landingpad != 0) found = CLEANUP_FOUND; if (found == 0) CONTINUE_UNWIND; if (actions & _UA_SEARCH_PHASE) { if (!(found & HANDLER_FOUND) || foreign) CONTINUE_UNWIND; /* Cache it so we don't have to search it again in phase 2 */ #ifndef HAVE_ARM_EHABI_EXCEPTIONS e->landingpad = landingpad; e->filter = filter; #else ex->barrierCache.sp = _Unwind_GetGR(ctx, 13); ex->barrierCache.bitPattern[1] = filter; ex->barrierCache.bitPattern[3] = landingpad; #endif return _URC_HANDLER_FOUND; } else if (actions & _UA_CLEANUP_PHASE) { if (!(found & CLEANUP_FOUND)) CONTINUE_UNWIND; |
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698 699 700 701 702 703 704 | static void cleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex) { free(ex); } static void | > | | | | | | | | > | | | | | 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 | static void cleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex) { free(ex); } static void emergencyExceptionCleanup(_Unwind_Reason_Code reason, struct _Unwind_Exception *ex) { #ifdef OF_HAVE_THREADS if (!of_spinlock_lock(&emergencyExceptionsSpinlock)) OBJC_ERROR("Cannot lock spinlock!"); #endif ex->class = 0; #ifdef OF_HAVE_THREADS if (!of_spinlock_unlock(&emergencyExceptionsSpinlock)) OBJC_ERROR("Cannot unlock spinlock!"); #endif } void objc_exception_throw(id object) { struct objc_exception *e = calloc(1, sizeof(*e)); bool emergency = false; if (e == NULL) { #ifdef OF_HAVE_THREADS if (!of_spinlock_lock(&emergencyExceptionsSpinlock)) OBJC_ERROR("Cannot lock spinlock!"); #endif for (uint_fast8_t i = 0; i < NUM_EMERGENCY_EXCEPTIONS; i++) { if (emergencyExceptions[i].exception.class == 0) { e = &emergencyExceptions[i]; e->exception.class = GNUCOBJC_EXCEPTION_CLASS; emergency = true; break; } } #ifdef OF_HAVE_THREADS if (!of_spinlock_unlock(&emergencyExceptionsSpinlock)) OBJC_ERROR("Cannot lock spinlock!"); #endif } if (e == NULL) OBJC_ERROR("Not enough memory to allocate exception!") e->exception.class = GNUCOBJC_EXCEPTION_CLASS; e->exception.cleanup = (emergency ? emergencyExceptionCleanup : cleanup); e->object = object; if (_Unwind_RaiseException(&e->exception) == _URC_END_OF_STACK && uncaughtExceptionHandler != NULL) uncaughtExceptionHandler(object); OBJC_ERROR("_Unwind_RaiseException() returned!") } objc_uncaught_exception_handler objc_setUncaughtExceptionHandler(objc_uncaught_exception_handler handler) { objc_uncaught_exception_handler old = uncaughtExceptionHandler; uncaughtExceptionHandler = handler; return old; } #ifdef HAVE_SEH_EXCEPTIONS typedef EXCEPTION_DISPOSITION (*seh_personality_fn)(PEXCEPTION_RECORD, void *, PCONTEXT, PDISPATCHER_CONTEXT); |
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