1 // Copyright (C) 1994-2018 Free Software Foundation, Inc. 2 // 3 // This file is part of GCC. 4 // 5 // GCC is free software; you can redistribute it and/or modify 6 // it under the terms of the GNU General Public License as published by 7 // the Free Software Foundation; either version 3, or (at your option) 8 // any later version. 9 10 // GCC is distributed in the hope that it will be useful, 11 // but WITHOUT ANY WARRANTY; without even the implied warranty of 12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 // GNU General Public License for more details. 14 15 // Under Section 7 of GPL version 3, you are granted additional 16 // permissions described in the GCC Runtime Library Exception, version 17 // 3.1, as published by the Free Software Foundation. 18 19 // You should have received a copy of the GNU General Public License and 20 // a copy of the GCC Runtime Library Exception along with this program; 21 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 22 // <http://www.gnu.org/licenses/>. 23 24 #include "tinfo.h" 25 26 namespace __cxxabiv1 { 27 28 __pbase_type_info:: 29 ~__pbase_type_info () 30 {} 31 32 bool __pbase_type_info:: 33 __do_catch (const type_info *thr_type, 34 void **thr_obj, 35 unsigned outer) const 36 { 37 if (*this == *thr_type) 38 return true; // same type 39 40 #if __cpp_rtti 41 if (*thr_type == typeid (nullptr)) 42 { 43 // A catch handler for any pointer type matches nullptr_t. 44 if (typeid (*this) == typeid(__pointer_type_info)) 45 { 46 *thr_obj = nullptr; 47 return true; 48 } 49 else if (typeid (*this) == typeid(__pointer_to_member_type_info)) 50 { 51 if (__pointee->__is_function_p ()) 52 { 53 using pmf_type = void (__pbase_type_info::*)(); 54 static const pmf_type pmf = nullptr; 55 *thr_obj = const_cast<pmf_type*>(&pmf); 56 return true; 57 } 58 else 59 { 60 using pm_type = int __pbase_type_info::*; 61 static const pm_type pm = nullptr; 62 *thr_obj = const_cast<pm_type*>(&pm); 63 return true; 64 } 65 } 66 } 67 68 if (typeid (*this) != typeid (*thr_type)) 69 return false; // not both same kind of pointers 70 #endif 71 72 if (!(outer & 1)) 73 // We're not the same and our outer pointers are not all const qualified 74 // Therefore there must at least be a qualification conversion involved 75 // But for that to be valid, our outer pointers must be const qualified. 76 return false; 77 78 const __pbase_type_info *thrown_type = 79 static_cast <const __pbase_type_info *> (thr_type); 80 81 unsigned tflags = thrown_type->__flags; 82 83 const unsigned fqual_mask = __transaction_safe_mask|__noexcept_mask; 84 unsigned throw_fqual = (tflags & fqual_mask); 85 unsigned catch_fqual = (__flags & fqual_mask); 86 if (throw_fqual & ~catch_fqual) 87 /* Catch can perform a function pointer conversion. */ 88 tflags &= catch_fqual; 89 if (catch_fqual & ~throw_fqual) 90 /* But not the reverse. */ 91 return false; 92 93 if (tflags & ~__flags) 94 // We're less qualified. 95 return false; 96 97 if (!(__flags & __const_mask)) 98 outer &= ~1; 99 100 return __pointer_catch (thrown_type, thr_obj, outer); 101 } 102 103 } 104