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| Source at commit 1406 created 12 years 10 months ago. By meklort, Revert drivers.c so that kexts are only loaded when OSBundleRequired is set and that value is not safe mode. Added some comments about it too. | |
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| 1 | // -*- C++ -*- Exception handling and frame unwind runtime interface routines.␍␊ |
| 2 | // Copyright (C) 2001 Free Software Foundation, Inc.␍␊ |
| 3 | //␍␊ |
| 4 | // This file is part of GCC.␍␊ |
| 5 | //␍␊ |
| 6 | // GCC is free software; you can redistribute it and/or modify␍␊ |
| 7 | // it under the terms of the GNU General Public License as published by␍␊ |
| 8 | // the Free Software Foundation; either version 2, or (at your option)␍␊ |
| 9 | // any later version.␍␊ |
| 10 | //␍␊ |
| 11 | // GCC is distributed in the hope that it will be useful,␍␊ |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of␍␊ |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the␍␊ |
| 14 | // GNU General Public License for more details.␍␊ |
| 15 | //␍␊ |
| 16 | // You should have received a copy of the GNU General Public License␍␊ |
| 17 | // along with GCC; see the file COPYING. If not, write to␍␊ |
| 18 | // the Free Software Foundation, 59 Temple Place - Suite 330,␍␊ |
| 19 | // Boston, MA 02111-1307, USA.␍␊ |
| 20 | ␍␊ |
| 21 | // As a special exception, you may use this file as part of a free software␍␊ |
| 22 | // library without restriction. Specifically, if other files instantiate␍␊ |
| 23 | // templates or use macros or inline functions from this file, or you compile␍␊ |
| 24 | // this file and link it with other files to produce an executable, this␍␊ |
| 25 | // file does not by itself cause the resulting executable to be covered by␍␊ |
| 26 | // the GNU General Public License. This exception does not however␍␊ |
| 27 | // invalidate any other reasons why the executable file might be covered by␍␊ |
| 28 | // the GNU General Public License.␍␊ |
| 29 | ␍␊ |
| 30 | // This is derived from the C++ ABI for IA-64. Where we diverge␍␊ |
| 31 | // for cross-architecture compatibility are noted with "@@@".␍␊ |
| 32 | ␍␊ |
| 33 | #ifndef _UNWIND_CXX_H␍␊ |
| 34 | #define _UNWIND_CXX_H 1␍␊ |
| 35 | ␍␊ |
| 36 | // Level 2: C++ ABI␍␊ |
| 37 | ␍␊ |
| 38 | #include <typeinfo>␍␊ |
| 39 | #include <exception>␍␊ |
| 40 | #include <cstddef>␍␊ |
| 41 | #include <unwind.h>␍␊ |
| 42 | ␍␊ |
| 43 | #pragma GCC visibility push(default)␍␊ |
| 44 | ␍␊ |
| 45 | namespace __cxxabiv1␍␊ |
| 46 | {␍␊ |
| 47 | ␍␊ |
| 48 | #ifdef __UCLIBCXX_EXCEPTION_SUPPORT__␍␊ |
| 49 | ␍␊ |
| 50 | // A C++ exception object consists of a header, which is a wrapper around␍␊ |
| 51 | // an unwind object header with additional C++ specific information,␍␊ |
| 52 | // followed by the exception object itself.␍␊ |
| 53 | ␍␊ |
| 54 | struct __cxa_exception␍␊ |
| 55 | { ␍␊ |
| 56 | // Manage the exception object itself.␍␊ |
| 57 | std::type_info *exceptionType;␍␊ |
| 58 | void (*exceptionDestructor)(void *); ␍␊ |
| 59 | ␍␊ |
| 60 | // The C++ standard has entertaining rules wrt calling set_terminate␍␊ |
| 61 | // and set_unexpected in the middle of the exception cleanup process.␍␊ |
| 62 | std::unexpected_handler unexpectedHandler;␍␊ |
| 63 | std::terminate_handler terminateHandler;␍␊ |
| 64 | ␍␊ |
| 65 | // The caught exception stack threads through here.␍␊ |
| 66 | __cxa_exception *nextException;␍␊ |
| 67 | ␍␊ |
| 68 | // How many nested handlers have caught this exception. A negated␍␊ |
| 69 | // value is a signal that this object has been rethrown.␍␊ |
| 70 | int handlerCount;␍␊ |
| 71 | ␍␊ |
| 72 | // Cache parsed handler data from the personality routine Phase 1␍␊ |
| 73 | // for Phase 2 and __cxa_call_unexpected.␍␊ |
| 74 | int handlerSwitchValue;␍␊ |
| 75 | const unsigned char *actionRecord;␍␊ |
| 76 | const unsigned char *languageSpecificData;␍␊ |
| 77 | _Unwind_Ptr catchTemp;␍␊ |
| 78 | void *adjustedPtr;␍␊ |
| 79 | ␍␊ |
| 80 | // The generic exception header. Must be last.␍␊ |
| 81 | _Unwind_Exception unwindHeader;␍␊ |
| 82 | };␍␊ |
| 83 | ␍␊ |
| 84 | ␉// Each thread in a C++ program has access to a __cxa_eh_globals object.␍␊ |
| 85 | struct __cxa_eh_globals␍␊ |
| 86 | {␍␊ |
| 87 | __cxa_exception *caughtExceptions;␍␊ |
| 88 | unsigned int uncaughtExceptions;␍␊ |
| 89 | };␍␊ |
| 90 | ␍␊ |
| 91 | ␍␊ |
| 92 | // The __cxa_eh_globals for the current thread can be obtained by using␍␊ |
| 93 | // either of the following functions. The "fast" version assumes at least␍␊ |
| 94 | // one prior call of __cxa_get_globals has been made from the current␍␊ |
| 95 | // thread, so no initialization is necessary.␍␊ |
| 96 | extern "C" __cxa_eh_globals *__cxa_get_globals () throw();␍␊ |
| 97 | extern "C" __cxa_eh_globals *__cxa_get_globals_fast () throw();␍␊ |
| 98 | #endif␍␊ |
| 99 | ␍␊ |
| 100 | #ifdef __UCLIBCXX_EXCEPTION_SUPPORT__␍␊ |
| 101 | // Allocate memory for the exception plus the thown object.␍␊ |
| 102 | extern "C" void *__cxa_allocate_exception(std::size_t thrown_size) throw();␍␊ |
| 103 | ␍␊ |
| 104 | // Free the space allocated for the exception.␍␊ |
| 105 | extern "C" void __cxa_free_exception(void *thrown_exception) throw();␍␊ |
| 106 | ␍␊ |
| 107 | // Throw the exception.␍␊ |
| 108 | extern "C" void __cxa_throw (void *thrown_exception,␍␊ |
| 109 | ␉␉␉ std::type_info *tinfo,␍␊ |
| 110 | ␉␉␉ void (*dest) (void *))␍␊ |
| 111 | __attribute__((noreturn));␍␊ |
| 112 | ␍␊ |
| 113 | // Used to implement exception handlers.␍␊ |
| 114 | extern "C" void *__cxa_begin_catch (void *) throw();␍␊ |
| 115 | extern "C" void __cxa_end_catch ();␍␊ |
| 116 | extern "C" void __cxa_rethrow () __attribute__((noreturn));␍␊ |
| 117 | #endif␍␊ |
| 118 | ␉␍␊ |
| 119 | // These facilitate code generation for recurring situations.␍␊ |
| 120 | extern "C" void __cxa_bad_cast ();␍␊ |
| 121 | extern "C" void __cxa_bad_typeid ();␍␊ |
| 122 | ␍␊ |
| 123 | // @@@ These are not directly specified by the IA-64 C++ ABI.␍␊ |
| 124 | ␍␊ |
| 125 | // Handles re-checking the exception specification if unexpectedHandler␍␊ |
| 126 | // throws, and if bad_exception needs to be thrown. Called from the␍␊ |
| 127 | // compiler.␍␊ |
| 128 | extern "C" void __cxa_call_unexpected (void *) __attribute__((noreturn));␍␊ |
| 129 | ␍␊ |
| 130 | // Invokes given handler, dying appropriately if the user handler was␍␊ |
| 131 | // so inconsiderate as to return.␍␊ |
| 132 | extern void __terminate(std::terminate_handler) __attribute__((noreturn));␍␊ |
| 133 | extern void __unexpected(std::unexpected_handler) __attribute__((noreturn));␍␊ |
| 134 | ␍␊ |
| 135 | // The current installed user handlers.␍␊ |
| 136 | extern std::terminate_handler __terminate_handler;␍␊ |
| 137 | extern std::unexpected_handler __unexpected_handler;␍␊ |
| 138 | ␉␍␊ |
| 139 | #ifdef __UCLIBCXX_EXCEPTION_SUPPORT__␍␊ |
| 140 | // Acquire the C++ exception header from the C++ object.␍␊ |
| 141 | static inline __cxa_exception *␍␊ |
| 142 | __get_exception_header_from_obj (void *ptr)␍␊ |
| 143 | {␍␊ |
| 144 | return reinterpret_cast<__cxa_exception *>(ptr) - 1;␍␊ |
| 145 | }␍␊ |
| 146 | ␍␊ |
| 147 | // Acquire the C++ exception header from the generic exception header.␍␊ |
| 148 | static inline __cxa_exception *␍␊ |
| 149 | __get_exception_header_from_ue (_Unwind_Exception *exc)␍␊ |
| 150 | {␍␊ |
| 151 | return reinterpret_cast<__cxa_exception *>(exc + 1) - 1;␍␊ |
| 152 | }␍␊ |
| 153 | #endif␍␊ |
| 154 | } /* namespace __cxxabiv1 */␍␊ |
| 155 | ␍␊ |
| 156 | #pragma GCC visibility pop␍␊ |
| 157 | ␍␊ |
| 158 | #endif // _UNWIND_CXX_H␍␊ |
| 159 | |
