spec.html revision 7123bcb3bbbcc33c69666d4f0f83052b9a64a7fb
1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" 2 "http://www.w3.org/TR/html4/strict.dtd"> 3<html> 4<head> 5 <title>libc++abi spec</title> 6</head> 7<body> 8 9<table border=1> 10<tr> 11<th rowspan=2>libc++abi Specification</th> 12<th colspan=3>Completed ?</th> 13</tr> 14 15<tr> 16<th>dawin</th><th>linux</th><th>arm</th> 17</tr> 18 19<tr> 20<td colspan=4 align="center">Memory management</td> 21</tr> 22 23<tr> 24<td> 25<p> 26<code>void* __cxa_allocate_exception(size_t thrown_size) throw();</code> 27</p> 28<blockquote> 29<p> 30<i>Effects:</i> Allocates <tt>thrown_size</tt> bytes of memory. If memory 31can not be allocated, call <tt>std::terminate()</tt>. 32</p> 33<p> 34<i>Returns:</i> A pointer to the allocated memory. 35</p> 36</blockquote> 37</td> 38<td></td> 39<td></td> 40<td></td> 41</tr> 42 43<tr> 44<td> 45<p> 46<code>void __cxa_free_exception(void * thrown_exception) throw();</code> 47</p> 48<blockquote> 49<p> 50<i>Effects:</i> Deallocates the memory pointed to. 51</p> 52</blockquote> 53</td> 54<td></td> 55<td></td> 56<td></td> 57</tr> 58 59<tr> 60<td colspan=4 align="center">Exception Handling</td> 61</tr> 62 63<tr> 64<td> 65<p> 66<code>void __cxa_throw(void* thrown_exception, struct std::type_info * tinfo, 67 void (*dest)(void*));</code> 68</p> 69<blockquote> 70<p> 71<i>Effects:</i> 72</p> 73</blockquote> 74</td> 75<td></td> 76<td></td> 77<td></td> 78</tr> 79 80<tr> 81<td> 82<p> 83<code>void* __cxa_get_exception_ptr(void* exceptionObject) throw();</code> 84</p> 85<blockquote> 86<p> 87<i>Returns:</i> The adjusted pointer to the exception object. (The adjusted 88pointer is typically computed by the personality routine during phase 1 and 89saved in the exception object.) 90</p> 91</blockquote> 92</td> 93<td></td> 94<td></td> 95<td></td> 96</tr> 97 98<tr> 99<td> 100<p> 101<code>void* __cxa_begin_catch(void* exceptionObject) throw();</code> 102</p> 103<blockquote> 104<p> 105<i>Effects:</i> 106</p> 107<ul> 108<li>Increment's the exception's handler count.</li> 109<li>Places the exception on the stack of currently-caught exceptions if it is 110not already there, linking the exception to the previous top of the stack.</li> 111<li>Decrements the uncaught_exception count.</li> 112</ul> 113<p> 114If the initialization of the catch parameter is trivial (e,g., there is no 115formal catch parameter, or the parameter has no copy constructor), the calls to 116<tt>__cxa_get_exception_ptr()</tt> and <tt>__cxa_begin_catch()</tt> may be 117combined into a single call to <tt>__cxa_begin_catch()</tt>. 118</p> 119<p> 120When the personality routine encounters a termination condition, it will call 121<tt>__cxa_begin_catch()</tt> to mark the exception as handled and then call 122<tt>terminate()</tt>, which shall not return to its caller. 123</p> 124<p> 125<i>Returns:</i> The adjusted pointer to the exception object. 126</p> 127</blockquote> 128</td> 129<td></td> 130<td></td> 131<td></td> 132</tr> 133 134<tr> 135<td> 136<p> 137<code>void __cxa_end_catch();</code> 138</p> 139<blockquote> 140<p> 141<i>Effects:</i> Locates the most recently caught exception and decrements its 142handler count. Removes the exception from the caughtÓexception stack, if the 143handler count goes to zero. Destroys the exception if the handler count goes to 144zero, and the exception was not re-thrown by throw. Collaboration between 145__cxa_rethrow() and __cxa_end_catch() is necessary to handle the last point. 146Though implementation-defined, one possibility is for __cxa_rethrow() to set a 147flag in the handlerCount member of the exception header to mark an exception 148being rethrown. 149</p> 150</blockquote> 151</td> 152<td></td> 153<td></td> 154<td></td> 155</tr> 156 157<tr> 158<td> 159<p> 160<code>std::type_info* __cxa_current_exception_type();</code> 161</p> 162<blockquote> 163<p> 164<i>Returns:</i> the type of the currently handled exception, or null if there 165are no caught exceptions. 166</p> 167</blockquote> 168</td> 169<td></td> 170<td></td> 171<td></td> 172</tr> 173 174<tr> 175<td> 176<p> 177<code>void __cxa_rethrow();</code> 178</p> 179<blockquote> 180<p> 181<i>Effects:</i> Marks the exception object on top of the caughtExceptions stack 182(in an implementation-defined way) as being rethrown. If the caughtExceptions 183stack is empty, it calls terminate() (see [C++FDIS] [except.throw], 15.1.8). It 184then returns to the handler that called it, which must call __cxa_end_catch(), 185perform any necessary cleanup, and finally call _Unwind_Resume() to continue 186unwinding. 187</p> 188</blockquote> 189</td> 190<td></td> 191<td></td> 192<td></td> 193</tr> 194 195<tr> 196<td> 197<p> 198<code>void* __cxa_current_primary_exception() throw();</code> 199</p> 200<blockquote> 201<p> 202<i>Effects:</i> Increments the ownership count of the currently handled 203exception (if any) by one. 204</p> 205<p> 206<i>Returns:</i> the type of the currently handled exception, or null if there 207are no caught exceptions. 208</p> 209</blockquote> 210</td> 211<td></td> 212<td></td> 213<td></td> 214</tr> 215 216<tr> 217<td> 218<p> 219<code>void __cxa_decrement_exception_refcount(void* primary_exception) throw();</code> 220</p> 221<blockquote> 222<p> 223<i>Effects:</i> Decrements the ownership count of the exception by 1, and on 224zero calls <tt>_Unwind_DeleteException</tt> with the exception object. 225</p> 226</blockquote> 227</td> 228<td></td> 229<td></td> 230<td></td> 231</tr> 232 233<tr> 234<td> 235<p> 236<code>__cxa_eh_globals* __cxa_get_globals() throw();</code> 237</p> 238<blockquote> 239<p> 240<i>Returns:</i> A pointer to the __cxa_eh_globals structure for the current 241thread, initializing it if necessary. 242</p> 243</blockquote> 244</td> 245<td></td> 246<td></td> 247<td></td> 248</tr> 249 250<tr> 251<td> 252<p> 253<code>__cxa_eh_globals* __cxa_get_globals_fast() throw();</code> 254</p> 255<blockquote> 256<p> 257<i>Requires:</i> At least one prior call to __cxa_get_globals has been made from 258the current thread. 259</p> 260<p> 261<i>Returns:</i> A pointer to the __cxa_eh_globals structure for the current 262thread. 263</p> 264</blockquote> 265</td> 266<td></td> 267<td></td> 268<td></td> 269</tr> 270 271<tr> 272<td> 273<p> 274<code>void __cxa_increment_exception_refcount(void* primary_exception) throw();</code> 275</p> 276<blockquote> 277<p> 278<i>Effects:</i> Increments the ownership count of the referenced exception. 279</p> 280</blockquote> 281</td> 282<td></td> 283<td></td> 284<td></td> 285</tr> 286 287<tr> 288<td> 289<p> 290<code>void __cxa_rethrow_primary_exception(void* primary_exception);</code> 291</p> 292<blockquote> 293<p> 294<i>Effects:</i> Implements <tt>std::rethrow_exception(exception_ptr p)</tt>. 295</p> 296</blockquote> 297</td> 298<td></td> 299<td></td> 300<td></td> 301</tr> 302 303<tr> 304<td> 305<p> 306<code>bool __cxa_uncaught_exception() throw();</code> 307</p> 308<blockquote> 309<p> 310<i>Effects:</i> 311</p> 312<p> 313<i>Returns:</i> 314</p> 315</blockquote> 316</td> 317<td></td> 318<td></td> 319<td></td> 320</tr> 321 322<tr> 323<td> 324<p> 325<code>_Unwind_Reason_Code __gxx_personality_v0 326 (int, _Unwind_Action, _Unwind_Exception_Class, 327 struct _Unwind_Exception *, struct _Unwind_Context *);</code> 328</p> 329<blockquote> 330<p> 331<i>Effects:</i> 332</p> 333<p> 334<i>Returns:</i> 335</p> 336</blockquote> 337</td> 338<td></td> 339<td></td> 340<td></td> 341</tr> 342 343<tr> 344<td colspan=4 align="center">Guard objects</td> 345</tr> 346 347<tr> 348<td> 349<p> 350<code>int __cxa_guard_acquire(uint64_t* guard_object);</code> 351</p> 352<blockquote> 353<p> 354<i>Effects:</i> This function is called before initialization takes place. If 355this function returns 1, either <code>__cxa_guard_release</code> or 356<code>__cxa_guard_abort</code> must be called with the same argument. The first 357byte of the <code>guard_object</code> is not modified by this function. 358</p> 359<p> 360On Darwin the implementation checks for deadlock. 361</p> 362<p> 363<i>Returns:</i> 1 if the initialization is not yet complete, otherwise 0. 364</p> 365</blockquote> 366</td> 367<td>✓</td> 368<td>✓</td> 369<td>✓</td> 370</tr> 371 372<tr> 373<td> 374<p> 375<code>void __cxa_guard_release(uint64_t*);</code> 376</p> 377<blockquote> 378<p> 379<i>Effects:</i> Sets the first byte of the guard object to a non-zero value. 380This function is called after initialization is complete. A thread-safe 381implementation will release the mutex acquired by __cxa_guard_acquire after 382setting the first byte of the guard object. 383</p> 384</blockquote> 385</td> 386<td></td> 387<td></td> 388<td></td> 389</tr> 390 391<tr> 392<td> 393<p> 394<code>void __cxa_guard_abort(uint64_t*);</code> 395</p> 396<blockquote> 397<p> 398<i>Effects:</i> This function is called if the initialization terminates by 399throwing an exception. 400</p> 401</blockquote> 402</td> 403<td></td> 404<td></td> 405<td></td> 406</tr> 407 408<tr> 409<td colspan=4 align="center">Vector construction and destruction</td> 410</tr> 411 412<tr> 413<td> 414<p> 415<code>void* __cxa_vec_new(size_t element_count, 416 size_t element_size, 417 size_t padding_size, 418 void (*constructor)(void*), 419 void (*destructor)(void*) );</code> 420</p> 421<blockquote> 422<p> 423<i>Effects:</i> 424</p> 425<p> 426<i>Returns:</i> 427</p> 428</blockquote> 429</td> 430<td></td> 431<td></td> 432<td></td> 433</tr> 434 435<tr> 436<td> 437<p> 438<code>void* __cxa_vec_new2(size_t element_count, 439 size_t element_size, 440 size_t padding_size, 441 void (*constructor)(void*), 442 void (*destructor)(void*), 443 void* (*alloc)(size_t), 444 void (*dealloc)(void*) );</code> 445</p> 446<blockquote> 447<p> 448<i>Effects:</i> 449</p> 450<p> 451<i>Returns:</i> 452</p> 453</blockquote> 454</td> 455<td></td> 456<td></td> 457<td></td> 458</tr> 459 460<tr> 461<td> 462<p> 463<code>void* __cxa_vec_new3(size_t element_count, 464 size_t element_size, 465 size_t padding_size, 466 void (*constructor)(void*), 467 void (*destructor)(void*), 468 void* (*alloc)(size_t), 469 void (*dealloc)(void*, size_t) );</code> 470</p> 471<blockquote> 472<p> 473<i>Effects:</i> 474</p> 475<p> 476<i>Returns:</i> 477</p> 478</blockquote> 479</td> 480<td></td> 481<td></td> 482<td></td> 483</tr> 484 485<tr> 486<td> 487<p> 488<code>void __cxa_vec_ctor(void* array_address, 489 size_t element_count, 490 size_t element_size, 491 void (*constructor)(void*), 492 void (*destructor)(void*) );</code> 493</p> 494<blockquote> 495<p> 496<i>Effects:</i> 497</p> 498</blockquote> 499</td> 500<td></td> 501<td></td> 502<td></td> 503</tr> 504 505<tr> 506<td> 507<p> 508<code>void __cxa_vec_dtor(void* array_address, 509 size_t element_count, 510 size_t element_size, 511 void (*destructor)(void*) );</code> 512</p> 513<blockquote> 514<p> 515<i>Effects:</i> 516</p> 517</blockquote> 518</td> 519<td></td> 520<td></td> 521<td></td> 522</tr> 523 524<tr> 525<td> 526<p> 527<code>void __cxa_vec_cleanup(void* array_address, 528 size_t element_count, 529 size_t element_size, 530 void (*destructor)(void*) );</code> 531</p> 532<blockquote> 533<p> 534<i>Effects:</i> 535</p> 536</blockquote> 537</td> 538<td></td> 539<td></td> 540<td></td> 541</tr> 542 543<tr> 544<td> 545<p> 546<code>void __cxa_vec_delete(void* array_address, 547 size_t element_size, 548 size_t padding_size, 549 void (*destructor)(void*) );</code> 550</p> 551<blockquote> 552<p> 553<i>Effects:</i> 554</p> 555</blockquote> 556</td> 557<td></td> 558<td></td> 559<td></td> 560</tr> 561 562<tr> 563<td> 564<p> 565<code>void __cxa_vec_delete2(void* array_address, 566 size_t element_size, 567 size_t padding_size, 568 void (*destructor)(void*), 569 void (*dealloc)(void*) );</code> 570</p> 571<blockquote> 572<p> 573<i>Effects:</i> 574</p> 575</blockquote> 576</td> 577<td></td> 578<td></td> 579<td></td> 580</tr> 581 582<tr> 583<td> 584<p> 585<code>void __cxa_vec_delete3(void* __array_address, 586 size_t element_size, 587 size_t padding_size, 588 void (*destructor)(void*), 589 void (*dealloc) (void*, size_t));</code> 590</p> 591<blockquote> 592<p> 593<i>Effects:</i> 594</p> 595</blockquote> 596</td> 597<td></td> 598<td></td> 599<td></td> 600</tr> 601 602<tr> 603<td> 604<p> 605<code>void __cxa_vec_cctor(void* dest_array, 606 void* src_array, 607 size_t element_count, 608 size_t element_size, 609 void (*constructor) (void*, void*), 610 void (*destructor)(void*) );</code> 611</p> 612<blockquote> 613<p> 614<i>Effects:</i> 615</p> 616</blockquote> 617</td> 618<td></td> 619<td></td> 620<td></td> 621</tr> 622 623<tr> 624<td colspan=4 align="center">Handlers</td> 625</tr> 626 627<tr> 628<td> 629<p> 630<code>void (*__cxa_new_handler)();</code> 631</p> 632<blockquote> 633<p> 634The currently installed new handler. 635</p> 636</blockquote> 637</td> 638<td></td> 639<td></td> 640<td></td> 641</tr> 642 643<tr> 644<td> 645<p> 646<code>void (*__cxa_terminate_handler)();</code> 647</p> 648<blockquote> 649<p> 650The currently installed terminate handler. 651</p> 652</blockquote> 653</td> 654<td></td> 655<td></td> 656<td></td> 657</tr> 658 659<tr> 660<td> 661<p> 662<code>void (*__cxa_unexpected_handler)();</code> 663</p> 664<blockquote> 665<p> 666<i>Effects:</i> 667</p> 668</blockquote> 669</td> 670<td></td> 671<td></td> 672<td></td> 673</tr> 674 675 676 677<tr> 678<td colspan=4 align="center">Utilities</td> 679</tr> 680 681<tr> 682<td> 683<p> 684<code>[[noreturn]] void __cxa_bad_cast()</code> 685</p> 686<blockquote> 687<p> 688<i>Effects:</i> Throws an exception of type <tt>bad_cast</tt>. 689</p> 690</blockquote> 691</td> 692<td></td> 693<td></td> 694<td></td> 695</tr> 696 697<tr> 698<td> 699<p> 700<code>[[noreturn]] void __cxa_bad_typeid();</code> 701</p> 702<blockquote> 703<p> 704<i>Effects:</i> Throws an exception of type <tt>bad_typeid</tt>. 705</p> 706</blockquote> 707</td> 708<td></td> 709<td></td> 710<td></td> 711</tr> 712 713<tr> 714<td> 715<p> 716<code>void __cxa_pure_virtual(void);</code> 717</p> 718<blockquote> 719<p> 720<i>Effects:</i> Called if the user calls a non-overridden pure virtual function, 721which has undefined behavior according to the C++ Standard. Ends the program. 722</p> 723</blockquote> 724</td> 725<td></td> 726<td></td> 727<td></td> 728</tr> 729 730<tr> 731<td> 732<p> 733<code>void __cxa_call_unexpected (void*) __attribute__((noreturn));</code> 734</p> 735<blockquote> 736<p> 737<i>Effects:</i> Handles re-checking the exception specification if 738unexpectedHandler throws, and if <tt>bad_exception</tt> needs to be thrown. 739Called from the compiler. 740</p> 741</blockquote> 742</td> 743<td></td> 744<td></td> 745<td></td> 746</tr> 747 748<tr> 749<td> 750<p> 751<code>char* __cxa_demangle(const char* mangled_name, 752 char* output_buffer, 753 size_t* length, 754 int* status);</code> 755</p> 756<blockquote> 757<p> 758<i>Effects:</i> 759</p> 760<p> 761<i>Returns:</i> 762</p> 763</blockquote> 764</td> 765<td></td> 766<td></td> 767<td></td> 768</tr> 769 770<tr> 771<td> 772<p> 773<code>void* 774 __dynamic_cast(const void* __src_ptr, 775 const __class_type_info* __src_type, 776 const __class_type_info* __dst_type, 777 ptrdiff_t __src2dst);</code> 778</p> 779<blockquote> 780<p> 781<i>Effects:</i> 782</p> 783<p> 784<i>Returns:</i> 785</p> 786</blockquote> 787</td> 788<td></td> 789<td></td> 790<td></td> 791</tr> 792 793</table> 794 795<!-- 796000000000000d570 (__DATA,__const) external typeinfo for char32_t 797000000000000cfd0 (__DATA,__const) external typeinfo for std::nullptr_t 798000000000000d520 (__DATA,__const) external typeinfo for char16_t 799000000000000d580 (__DATA,__const) external typeinfo for char32_t* 800000000000000cfe0 (__DATA,__const) external typeinfo for std::nullptr_t* 801000000000000d530 (__DATA,__const) external typeinfo for char16_t* 802000000000000d5a0 (__DATA,__const) external typeinfo for char32_t const* 803000000000000d000 (__DATA,__const) external typeinfo for std::nullptr_t const* 804000000000000d550 (__DATA,__const) external typeinfo for char16_t const* 805000000000000d190 (__DATA,__const) external typeinfo for signed char const* 806000000000000d050 (__DATA,__const) external typeinfo 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9090000000000009381 (__TEXT,__cstring) external typeinfo name for signed char 910000000000000935d (__TEXT,__cstring) external typeinfo name for bool 911000000000000936f (__TEXT,__cstring) external typeinfo name for char 91200000000000093db (__TEXT,__cstring) external typeinfo name for double 91300000000000093e4 (__TEXT,__cstring) external typeinfo name for long double 91400000000000093d2 (__TEXT,__cstring) external typeinfo name for float 9150000000000009378 (__TEXT,__cstring) external typeinfo name for unsigned char 916000000000000939c (__TEXT,__cstring) external typeinfo name for int 91700000000000093a5 (__TEXT,__cstring) external typeinfo name for unsigned int 91800000000000093ae (__TEXT,__cstring) external typeinfo name for long 91900000000000093b7 (__TEXT,__cstring) external typeinfo name for unsigned long 920000000000000938a (__TEXT,__cstring) external typeinfo name for short 9210000000000009393 (__TEXT,__cstring) external typeinfo name for unsigned short 9220000000000009348 (__TEXT,__cstring) external typeinfo name for void 9230000000000009366 (__TEXT,__cstring) external typeinfo name for wchar_t 92400000000000093c0 (__TEXT,__cstring) external typeinfo name for long long 92500000000000093c9 (__TEXT,__cstring) external typeinfo name for unsigned long long 926000000000000ce30 (__DATA,__const) external vtable for __cxxabiv1::__enum_type_info 927000000000000cdb0 (__DATA,__const) external vtable for __cxxabiv1::__array_type_info 928000000000000cbe0 (__DATA,__const) external vtable for __cxxabiv1::__class_type_info 929000000000000ce70 (__DATA,__const) external vtable for __cxxabiv1::__pbase_type_info 930000000000000cec0 (__DATA,__const) external vtable for __cxxabiv1::__pointer_type_info 931000000000000cdf0 (__DATA,__const) external vtable for __cxxabiv1::__function_type_info 932000000000000cc40 (__DATA,__const) external vtable for __cxxabiv1::__si_class_type_info 933000000000000cca0 (__DATA,__const) external vtable for __cxxabiv1::__vmi_class_type_info 934000000000000cd70 (__DATA,__const) external vtable for __cxxabiv1::__fundamental_type_info 935000000000000cf10 (__DATA,__const) external vtable for __cxxabiv1::__pointer_to_member_type_info 936 937 (undefined) external ___stack_chk_fail (from libSystem) 938 (undefined) external ___stack_chk_guard (from libSystem) 939 (undefined) external ___stderrp (from libSystem) 940 (undefined) external ___strcat_chk (from libSystem) 941 (undefined) external _abort (from libSystem) 942 (undefined) external _calloc (from libSystem) 943 (undefined) external _dlsym (from libSystem) 944 (undefined) external _free (from libSystem) 945 (undefined) external _malloc (from libSystem) 946 (undefined) external _memcpy (from libSystem) 947 (undefined) external _pthread_getspecific (from libSystem) 948 (undefined) external _pthread_key_create (from libSystem) 949 (undefined) external _pthread_mutex_init (from libSystem) 950 (undefined) external _pthread_mutex_lock (from libSystem) 951 (undefined) external _pthread_mutex_unlock (from libSystem) 952 (undefined) external _pthread_mutexattr_init (from libSystem) 953 (undefined) external _pthread_mutexattr_settype (from libSystem) 954 (undefined) external _pthread_once (from libSystem) 955 (undefined) external _pthread_setspecific (from libSystem) 956 (undefined) external _realloc (from libSystem) 957 (undefined) external _strcmp (from libSystem) 958 (undefined) external _strcpy (from libSystem) 959 (undefined) external _strlen (from libSystem) 960 (undefined) external _strncmp (from libSystem) 961 (undefined) external _vasprintf (from libSystem) 962 (undefined) external _vfprintf (from libSystem) 963 (undefined) external dyld_stub_binder (from libSystem) 964 (undefined) external __Unwind_DeleteException (from libSystem) 965 (undefined) external __Unwind_GetIP (from libSystem) 966 (undefined) external __Unwind_GetLanguageSpecificData (from libSystem) 967 (undefined) external __Unwind_GetRegionStart (from libSystem) 968 (undefined) external __Unwind_RaiseException (from libSystem) 969 (undefined) external __Unwind_Resume_or_Rethrow (from libSystem) 970 (undefined) external __Unwind_SetGR (from libSystem) 971 (undefined) external __Unwind_SetIP (from libSystem) 972 (undefined) external ___bzero (from libSystem) 973 --> 974 975</body> 976</html> 977